mirror of
https://github.com/ntop/n2n.git
synced 2024-04-21 16:31:34 +00:00
Hamish Coleman
473b89c963
Most environments have predefined macros that identify the environment
to the source code. If we use these macros instead of defining our own
then there is one less parameter difference to keep track of with
different builds
cf:
http://web.archive.org/web/20191012035921/http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
https://sourceforge.net/p/predef/wiki/OperatingSystems/
3320 lines
121 KiB
C
3320 lines
121 KiB
C
/**
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* (C) 2007-22 - ntop.org and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not see see <http://www.gnu.org/licenses/>
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*
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*/
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#include <errno.h> // for errno, EAFNOSUPPORT, EINPROGRESS
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#include <fcntl.h> // for fcntl, F_SETFL, O_NONBLOCK
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#include <stdbool.h>
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#include <stdint.h> // for uint8_t, uint16_t, uint32_t, uin...
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#include <stdio.h> // for snprintf, sprintf
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#include <stdlib.h> // for free, calloc, getenv
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#include <string.h> // for memcpy, memset, NULL, memcmp
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#include <sys/time.h> // for timeval
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#include <sys/types.h> // for time_t, ssize_t, u_int
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#include <time.h> // for time
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#include <unistd.h> // for gethostname, sleep
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#include "auth.h" // for generate_private_key
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#include "portable_endian.h" // for be16toh, htobe16
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#include "header_encryption.h" // for packet_header_encrypt, packet_he...
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#include "n2n.h" // for n2n_edge_t, peer_info, n2n_edge_...
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#include "n2n_wire.h" // for encode_mac, fill_sockaddr, decod...
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#include "network_traffic_filter.h" // for create_network_traffic_filter
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#include "pearson.h" // for pearson_hash_128, pearson_hash_64
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#include "random_numbers.h" // for n2n_rand, n2n_rand_sqr
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#include "sn_selection.h" // for sn_selection_criterion_common_da...
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#include "speck.h" // for speck_128_decrypt, speck_128_enc...
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#include "uthash.h" // for UT_hash_handle, HASH_COUNT, HASH...
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#ifdef _WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include "edge_utils_win32.h"
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#else
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#include <arpa/inet.h> // for inet_ntoa, inet_addr, inet_ntop
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#include <netinet/in.h> // for sockaddr_in, ntohl, IPPROTO_IP
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#include <netinet/tcp.h> // for TCP_NODELAY
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#include <sys/select.h> // for select, FD_SET, FD_ISSET, FD_ZERO
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#include <sys/socket.h> // for setsockopt, AF_INET, connect
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#endif
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/* ************************************** */
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int resolve_create_thread (n2n_resolve_parameter_t **param, struct peer_info *sn_list);
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int resolve_check (n2n_resolve_parameter_t *param, uint8_t resolution_request, time_t now);
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int resolve_cancel_thread (n2n_resolve_parameter_t *param);
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static const char * supernode_ip (const n2n_edge_t * eee);
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static void send_register (n2n_edge_t *eee, const n2n_sock_t *remote_peer, const n2n_mac_t peer_mac, n2n_cookie_t cookie);
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static void check_peer_registration_needed (n2n_edge_t *eee,
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uint8_t from_supernode,
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uint8_t via_multicast,
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const n2n_mac_t mac,
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const n2n_cookie_t cookie,
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const n2n_ip_subnet_t *dev_addr,
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const n2n_desc_t *dev_desc,
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const n2n_sock_t *peer);
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static int edge_init_sockets (n2n_edge_t *eee);
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static void check_known_peer_sock_change (n2n_edge_t *eee,
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uint8_t from_supernode,
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uint8_t via_multicast,
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const n2n_mac_t mac,
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const n2n_ip_subnet_t *dev_addr,
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const n2n_desc_t *dev_desc,
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const n2n_sock_t *peer,
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time_t when);
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/* ************************************** */
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int edge_verify_conf (const n2n_edge_conf_t *conf) {
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if(conf->community_name[0] == 0)
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return -1;
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// REVISIT: are the following two conditions equal? if so, remove one. but note that sn_num is used elsewhere
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if(conf->sn_num == 0)
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return -2;
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if(HASH_COUNT(conf->supernodes) == 0)
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return -5;
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if(conf->register_interval < 1)
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return -3;
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if(((conf->encrypt_key == NULL) && (conf->transop_id != N2N_TRANSFORM_ID_NULL)) ||
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((conf->encrypt_key != NULL) && (conf->transop_id == N2N_TRANSFORM_ID_NULL)))
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return -4;
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return 0;
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}
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/* ************************************** */
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void edge_set_callbacks (n2n_edge_t *eee, const n2n_edge_callbacks_t *callbacks) {
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memcpy(&eee->cb, callbacks, sizeof(n2n_edge_callbacks_t));
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}
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/* ************************************** */
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void edge_set_userdata (n2n_edge_t *eee, void *user_data) {
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eee->user_data = user_data;
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}
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/* ************************************** */
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void* edge_get_userdata (n2n_edge_t *eee) {
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return(eee->user_data);
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}
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/* ************************************** */
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int edge_get_n2n_socket (n2n_edge_t *eee) {
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return(eee->sock);
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}
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/* ************************************** */
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int edge_get_management_socket (n2n_edge_t *eee) {
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return(eee->udp_mgmt_sock);
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}
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/* ************************************** */
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const char* transop_str (enum n2n_transform tr) {
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switch(tr) {
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case N2N_TRANSFORM_ID_NULL: return("null");
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case N2N_TRANSFORM_ID_TWOFISH: return("Twofish");
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case N2N_TRANSFORM_ID_AES: return("AES");
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case N2N_TRANSFORM_ID_CHACHA20:return("ChaCha20");
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case N2N_TRANSFORM_ID_SPECK: return("Speck");
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default: return("invalid");
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};
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}
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/* ************************************** */
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const char* compression_str (uint8_t cmpr) {
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switch(cmpr) {
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case N2N_COMPRESSION_ID_NONE: return("none");
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case N2N_COMPRESSION_ID_LZO: return("lzo1x");
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case N2N_COMPRESSION_ID_ZSTD: return("zstd");
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default: return("invalid");
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};
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}
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/* ************************************** */
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/** Destination 01:00:5E:00:00:00 - 01:00:5E:7F:FF:FF is multicast ethernet.
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*/
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static int is_ethMulticast (const void * buf, size_t bufsize) {
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int retval = 0;
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/* Match 01:00:5E:00:00:00 - 01:00:5E:7F:FF:FF */
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if(bufsize >= sizeof(ether_hdr_t)) {
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/* copy to aligned memory */
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ether_hdr_t eh;
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memcpy(&eh, buf, sizeof(ether_hdr_t));
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if((0x01 == eh.dhost[0]) &&
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(0x00 == eh.dhost[1]) &&
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(0x5E == eh.dhost[2]) &&
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(0 == (0x80 & eh.dhost[3])))
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retval = 1; /* This is an ethernet multicast packet [RFC1112]. */
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}
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return retval;
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}
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/* ************************************** */
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/** Destination MAC 33:33:0:00:00:00 - 33:33:FF:FF:FF:FF is reserved for IPv6
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* neighbour discovery.
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*/
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static int is_ip6_discovery (const void * buf, size_t bufsize) {
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int retval = 0;
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if(bufsize >= sizeof(ether_hdr_t)) {
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/* copy to aligned memory */
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ether_hdr_t eh;
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memcpy(&eh, buf, sizeof(ether_hdr_t));
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if((0x33 == eh.dhost[0]) && (0x33 == eh.dhost[1]))
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retval = 1; /* This is an IPv6 multicast packet [RFC2464]. */
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}
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return retval;
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}
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/* ************************************** */
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// reset number of supernode connection attempts: try only once for already more realiable tcp connections
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void reset_sup_attempts (n2n_edge_t *eee) {
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eee->sup_attempts = (eee->conf.connect_tcp) ? 1 : N2N_EDGE_SUP_ATTEMPTS;
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}
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// detect local IP address by probing a connection to the supernode
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static int detect_local_ip_address (n2n_sock_t* out_sock, const n2n_edge_t* eee) {
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struct sockaddr_in local_sock;
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struct sockaddr_in sn_sock;
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socklen_t sock_len = sizeof(local_sock);
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SOCKET probe_sock;
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int ret = 0;
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out_sock->family = AF_INVALID;
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// always detetct local port even/especially if chosen by OS...
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if((getsockname(eee->sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
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&& (local_sock.sin_family == AF_INET)
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&& (sock_len == sizeof(local_sock)))
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// remember the port number
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out_sock->port = ntohs(local_sock.sin_port);
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else
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ret = -1;
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// probe for local IP address
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probe_sock = socket(PF_INET, SOCK_DGRAM, 0);
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// connecting the UDP socket makes getsockname read the local address it uses to connect (to the sn in this case);
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// we cannot do it with the real (eee->sock) socket because socket does not accept any conenction from elsewhere then,
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// e.g. from another edge instead of the supernode; as re-connecting to AF_UNSPEC might not work to release the socket
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// on non-UNIXoids, we use a temporary socket
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if((int)probe_sock >= 0) {
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fill_sockaddr((struct sockaddr*)&sn_sock, sizeof(sn_sock), &eee->curr_sn->sock);
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if(connect(probe_sock, (struct sockaddr *)&sn_sock, sizeof(sn_sock)) == 0) {
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if((getsockname(probe_sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
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&& (local_sock.sin_family == AF_INET)
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&& (sock_len == sizeof(local_sock))) {
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memcpy(&(out_sock->addr.v4), &(local_sock.sin_addr.s_addr), IPV4_SIZE);
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} else
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ret = -4;
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} else
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ret = -3;
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closesocket(probe_sock);
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} else
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ret = -2;
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out_sock->family = AF_INET;
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return ret;
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}
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// open socket, close it before if TCP
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// in case of TCP, 'connect()' is required
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int supernode_connect (n2n_edge_t *eee) {
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int sockopt;
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struct sockaddr_in sn_sock;
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n2n_sock_t local_sock;
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n2n_sock_str_t sockbuf;
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if((eee->conf.connect_tcp) && (eee->sock >= 0)) {
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closesocket(eee->sock);
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eee->sock = -1;
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}
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if(eee->sock < 0) {
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if(eee->conf.local_port > 0)
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traceEvent(TRACE_NORMAL, "binding to local port %d",
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(eee->conf.connect_tcp) ? 0 : eee->conf.local_port);
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eee->sock = open_socket((eee->conf.connect_tcp) ? 0 : eee->conf.local_port,
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eee->conf.bind_address,
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eee->conf.connect_tcp);
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if(eee->sock < 0) {
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traceEvent(TRACE_ERROR, "failed to bind main UDP port %u",
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(eee->conf.connect_tcp) ? 0 : eee->conf.local_port);
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return -1;
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}
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fill_sockaddr((struct sockaddr*)&sn_sock, sizeof(sn_sock), &eee->curr_sn->sock);
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// set tcp socket to O_NONBLOCK so connect does not hang
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// requires checking the socket for readiness before sending and receving
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if(eee->conf.connect_tcp) {
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#ifdef _WIN32
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u_long value = 1;
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ioctlsocket(eee->sock, FIONBIO, &value);
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#else
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fcntl(eee->sock, F_SETFL, O_NONBLOCK);
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#endif
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if((connect(eee->sock, (struct sockaddr*)&(sn_sock), sizeof(struct sockaddr)) < 0)
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&& (errno != EINPROGRESS)) {
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eee->sock = -1;
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return -1;
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}
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}
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if(eee->conf.tos) {
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/* https://www.tucny.com/Home/dscp-tos */
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sockopt = eee->conf.tos;
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if(setsockopt(eee->sock, IPPROTO_IP, IP_TOS, (char *)&sockopt, sizeof(sockopt)) == 0)
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traceEvent(TRACE_INFO, "TOS set to 0x%x", eee->conf.tos);
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else
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traceEvent(TRACE_WARNING, "could not set TOS 0x%x[%d]: %s", eee->conf.tos, errno, strerror(errno));
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}
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#ifdef IP_PMTUDISC_DO
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sockopt = (eee->conf.disable_pmtu_discovery) ? IP_PMTUDISC_DONT : IP_PMTUDISC_DO;
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if(setsockopt(eee->sock, IPPROTO_IP, IP_MTU_DISCOVER, &sockopt, sizeof(sockopt)) < 0)
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traceEvent(TRACE_WARNING, "could not %s PMTU discovery[%d]: %s",
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(eee->conf.disable_pmtu_discovery) ? "disable" : "enable", errno, strerror(errno));
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else
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traceEvent(TRACE_INFO, "PMTU discovery %s", (eee->conf.disable_pmtu_discovery) ? "disabled" : "enabled");
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#endif
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memset(&local_sock, 0, sizeof(n2n_sock_t));
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if(detect_local_ip_address(&local_sock, eee) == 0) {
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// always overwrite local port even/especially if chosen by OS...
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eee->conf.preferred_sock.port = local_sock.port;
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// only if auto-detection mode, ...
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if(eee->conf.preferred_sock_auto) {
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// ... overwrite IP address, too (whole socket struct here)
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memcpy(&eee->conf.preferred_sock, &local_sock, sizeof(n2n_sock_t));
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traceEvent(TRACE_INFO, "determined local socket [%s]",
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sock_to_cstr(sockbuf, &local_sock));
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}
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}
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if(eee->cb.sock_opened)
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eee->cb.sock_opened(eee);
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}
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// REVISIT: add mgmt port notification to listener for better mgmt port
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// subscription support
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return 0;
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}
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// always closes the socket
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void supernode_disconnect (n2n_edge_t *eee) {
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if(!eee) {
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return;
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}
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if(eee->sock >= 0) {
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closesocket(eee->sock);
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eee->sock = -1;
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traceEvent(TRACE_DEBUG, "closed");
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}
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}
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/* ************************************** */
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/** Initialise an edge to defaults.
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*
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* This also initialises the NULL transform operation opstruct.
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*/
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n2n_edge_t* edge_init (const n2n_edge_conf_t *conf, int *rv) {
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n2n_transform_t transop_id = conf->transop_id;
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n2n_edge_t *eee = calloc(1, sizeof(n2n_edge_t));
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int rc = -1, i = 0;
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struct peer_info *scan, *tmp;
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uint8_t tmp_key[N2N_AUTH_CHALLENGE_SIZE];
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if((rc = edge_verify_conf(conf)) != 0) {
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traceEvent(TRACE_ERROR, "invalid configuration");
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goto edge_init_error;
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}
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if(!eee) {
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traceEvent(TRACE_ERROR, "cannot allocate memory");
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goto edge_init_error;
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}
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memcpy(&eee->conf, conf, sizeof(*conf));
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eee->curr_sn = eee->conf.supernodes;
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eee->start_time = time(NULL);
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eee->known_peers = NULL;
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eee->pending_peers = NULL;
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reset_sup_attempts(eee);
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sn_selection_criterion_common_data_default(eee);
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pearson_hash_init();
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// always initialize compression transforms so we can at least decompress
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rc = n2n_transop_lzo_init(&eee->conf, &eee->transop_lzo);
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if(rc) goto edge_init_error; /* error message is printed in lzo_init */
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#ifdef HAVE_ZSTD
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rc = n2n_transop_zstd_init(&eee->conf, &eee->transop_zstd);
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if(rc) goto edge_init_error; /* error message is printed in zstd_init */
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#endif
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traceEvent(TRACE_NORMAL, "number of supernodes in the list: %d\n", HASH_COUNT(eee->conf.supernodes));
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HASH_ITER(hh, eee->conf.supernodes, scan, tmp) {
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traceEvent(TRACE_NORMAL, "supernode %u => %s\n", i, (scan->ip_addr));
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i++;
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}
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/* Set active transop */
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switch(transop_id) {
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case N2N_TRANSFORM_ID_TWOFISH:
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rc = n2n_transop_tf_init(&eee->conf, &eee->transop);
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break;
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case N2N_TRANSFORM_ID_AES:
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rc = n2n_transop_aes_init(&eee->conf, &eee->transop);
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break;
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case N2N_TRANSFORM_ID_CHACHA20:
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rc = n2n_transop_cc20_init(&eee->conf, &eee->transop);
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break;
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case N2N_TRANSFORM_ID_SPECK:
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rc = n2n_transop_speck_init(&eee->conf, &eee->transop);
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break;
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default:
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rc = n2n_transop_null_init(&eee->conf, &eee->transop);
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}
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if((rc < 0) || (eee->transop.fwd == NULL) || (eee->transop.transform_id != transop_id)) {
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traceEvent(TRACE_ERROR, "transop init failed");
|
|
goto edge_init_error;
|
|
}
|
|
|
|
// set the key schedule (context) for header encryption if enabled
|
|
if(conf->header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
traceEvent(TRACE_NORMAL, "Header encryption is enabled.");
|
|
packet_header_setup_key((char *)(eee->conf.community_name),
|
|
&(eee->conf.header_encryption_ctx_static),
|
|
&(eee->conf.header_encryption_ctx_dynamic),
|
|
&(eee->conf.header_iv_ctx_static),
|
|
&(eee->conf.header_iv_ctx_dynamic));
|
|
// in case of user/password auth, initialize a random dynamic key to prevent
|
|
// unintentional communication with only-header-encrypted community; will be
|
|
// overwritten by legit key later
|
|
if(conf->shared_secret) {
|
|
memrnd(tmp_key, N2N_AUTH_CHALLENGE_SIZE);
|
|
packet_header_change_dynamic_key(tmp_key,
|
|
&(eee->conf.header_encryption_ctx_dynamic),
|
|
&(eee->conf.header_iv_ctx_dynamic));
|
|
}
|
|
}
|
|
|
|
// setup authentication scheme
|
|
if(!conf->shared_secret) {
|
|
// id-based scheme
|
|
eee->conf.auth.scheme = n2n_auth_simple_id;
|
|
// random authentication token
|
|
memrnd(eee->conf.auth.token, N2N_AUTH_ID_TOKEN_SIZE);
|
|
eee->conf.auth.token_size = N2N_AUTH_ID_TOKEN_SIZE;
|
|
} else {
|
|
// user-password scheme
|
|
eee->conf.auth.scheme = n2n_auth_user_password;
|
|
// 'token' stores public key and the last random challenge being set upon sending REGISTER_SUPER
|
|
memcpy(eee->conf.auth.token, eee->conf.public_key, N2N_PRIVATE_PUBLIC_KEY_SIZE);
|
|
// random part of token (challenge) will be generated and filled in at each REGISTER_SUPER
|
|
eee->conf.auth.token_size = N2N_AUTH_PW_TOKEN_SIZE;
|
|
// make sure that only stream ciphers are being used
|
|
if((transop_id != N2N_TRANSFORM_ID_CHACHA20)
|
|
&& (transop_id != N2N_TRANSFORM_ID_SPECK)) {
|
|
traceEvent(TRACE_ERROR, "user-password authentication requires ChaCha20 (-A4) or SPECK (-A5) to be used.");
|
|
goto edge_init_error;
|
|
}
|
|
}
|
|
|
|
if(eee->transop.no_encryption)
|
|
traceEvent(TRACE_WARNING, "encryption is disabled in edge");
|
|
|
|
// first time calling edge_init_sockets needs -1 in the sockets for it does throw an error
|
|
// on trying to close them (open_sockets does so for also being able to RE-open the sockets
|
|
// if called in-between, see "Supernode not responding" in update_supernode_reg(...)
|
|
eee->sock = -1;
|
|
eee->udp_mgmt_sock = -1;
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
eee->udp_multicast_sock = -1;
|
|
#endif
|
|
if(edge_init_sockets(eee) < 0) {
|
|
traceEvent(TRACE_ERROR, "socket setup failed");
|
|
goto edge_init_error;
|
|
}
|
|
|
|
if(resolve_create_thread(&(eee->resolve_parameter), eee->conf.supernodes) == 0) {
|
|
traceEvent(TRACE_NORMAL, "successfully created resolver thread");
|
|
}
|
|
|
|
eee->network_traffic_filter = create_network_traffic_filter();
|
|
network_traffic_filter_add_rule(eee->network_traffic_filter, eee->conf.network_traffic_filter_rules);
|
|
|
|
//edge_init_success:
|
|
*rv = 0;
|
|
return(eee);
|
|
|
|
edge_init_error:
|
|
if(eee)
|
|
free(eee);
|
|
*rv = rc;
|
|
return(NULL);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
static int find_and_remove_peer (struct peer_info **head, const n2n_mac_t mac) {
|
|
|
|
struct peer_info *peer;
|
|
|
|
HASH_FIND_PEER(*head, mac, peer);
|
|
if(peer) {
|
|
HASH_DEL(*head, peer);
|
|
free(peer);
|
|
return(1);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
static uint32_t localhost_v4 = 0x7f000001;
|
|
static uint8_t localhost_v6[IPV6_SIZE] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
|
|
|
|
/* Exclude localhost as it may be received when an edge node runs
|
|
* in the same supernode host.
|
|
*/
|
|
static int is_valid_peer_sock (const n2n_sock_t *sock) {
|
|
|
|
switch(sock->family) {
|
|
case AF_INET: {
|
|
uint32_t *a = (uint32_t*)sock->addr.v4;
|
|
|
|
if(*a != htonl(localhost_v4))
|
|
return(1);
|
|
}
|
|
break;
|
|
|
|
case AF_INET6:
|
|
if(memcmp(sock->addr.v6, localhost_v6, IPV6_SIZE))
|
|
return(1);
|
|
break;
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/* ***************************************************** */
|
|
|
|
|
|
/***
|
|
*
|
|
* For a given packet, find the apporopriate internal last valid time stamp for lookup
|
|
* and verify it (and also update, if applicable).
|
|
*/
|
|
static int find_peer_time_stamp_and_verify (n2n_edge_t * eee,
|
|
peer_info_t *sn, const n2n_mac_t mac,
|
|
uint64_t stamp, int allow_jitter) {
|
|
|
|
uint64_t *previous_stamp = NULL;
|
|
|
|
if(sn) {
|
|
// from supernode
|
|
previous_stamp = &(sn->last_valid_time_stamp);
|
|
} else {
|
|
// from (peer) edge
|
|
struct peer_info *peer;
|
|
HASH_FIND_PEER(eee->pending_peers, mac, peer);
|
|
if(!peer) {
|
|
HASH_FIND_PEER(eee->known_peers, mac, peer);
|
|
}
|
|
|
|
if(peer) {
|
|
// time_stamp_verify_and_update allows the pointer a previous stamp to be NULL
|
|
// if it is a (so far) unknown peer
|
|
previous_stamp = &(peer->last_valid_time_stamp);
|
|
}
|
|
}
|
|
|
|
// failure --> 0; success --> 1
|
|
return time_stamp_verify_and_update(stamp, previous_stamp, allow_jitter);
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
/***
|
|
*
|
|
* Register over multicast in case there is a peer on the same network listening
|
|
*/
|
|
static void register_with_local_peers (n2n_edge_t * eee) {
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if((eee->multicast_joined && eee->conf.allow_p2p)
|
|
&& (eee->conf.preferred_sock.family == (uint8_t)AF_INVALID)) {
|
|
/* send registration to the local multicast group */
|
|
traceEvent(TRACE_DEBUG, "registering with multicast group %s:%u",
|
|
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT);
|
|
send_register(eee, &(eee->multicast_peer), NULL, N2N_MCAST_REG_COOKIE);
|
|
}
|
|
#else
|
|
traceEvent(TRACE_DEBUG, "multicast peers discovery is disabled, skipping");
|
|
#endif
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
static struct peer_info* find_peer_by_sock (const n2n_sock_t *sock, struct peer_info *peer_list) {
|
|
|
|
struct peer_info *scan, *tmp, *ret = NULL;
|
|
|
|
HASH_ITER(hh, peer_list, scan, tmp) {
|
|
if(memcmp(&(scan->sock), sock, sizeof(n2n_sock_t)) == 0) {
|
|
ret = scan;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Start the registration process.
|
|
*
|
|
* If the peer is already in pending_peers, ignore the request.
|
|
* If not in pending_peers, add it and send a REGISTER.
|
|
*
|
|
* If hdr is for a direct peer-to-peer packet, try to register back to sender
|
|
* even if the MAC is in pending_peers. This is because an incident direct
|
|
* packet indicates that peer-to-peer exchange should work so more aggressive
|
|
* registration can be permitted (once per incoming packet) as this should only
|
|
* last for a small number of packets..
|
|
*
|
|
* Called from the main loop when Rx a packet for our device mac.
|
|
*/
|
|
static void register_with_new_peer (n2n_edge_t *eee,
|
|
uint8_t from_supernode,
|
|
uint8_t via_multicast,
|
|
const n2n_mac_t mac,
|
|
const n2n_ip_subnet_t *dev_addr,
|
|
const n2n_desc_t *dev_desc,
|
|
const n2n_sock_t *peer) {
|
|
|
|
/* REVISIT: purge of pending_peers not yet done. */
|
|
struct peer_info *scan;
|
|
macstr_t mac_buf;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
HASH_FIND_PEER(eee->pending_peers, mac, scan);
|
|
|
|
/* NOTE: pending_peers are purged periodically with purge_expired_nodes */
|
|
if(scan == NULL) {
|
|
scan = calloc(1, sizeof(struct peer_info));
|
|
|
|
memcpy(scan->mac_addr, mac, N2N_MAC_SIZE);
|
|
scan->sock = *peer;
|
|
scan->timeout = eee->conf.register_interval; /* TODO: should correspond to the peer supernode registration timeout */
|
|
scan->last_valid_time_stamp = initial_time_stamp();
|
|
if(via_multicast)
|
|
scan->local = 1;
|
|
|
|
HASH_ADD_PEER(eee->pending_peers, scan);
|
|
|
|
traceEvent(TRACE_DEBUG, "new pending peer %s [%s]",
|
|
macaddr_str(mac_buf, scan->mac_addr),
|
|
sock_to_cstr(sockbuf, &(scan->sock)));
|
|
|
|
traceEvent(TRACE_DEBUG, "pending peers list size=%u",
|
|
HASH_COUNT(eee->pending_peers));
|
|
/* trace Sending REGISTER */
|
|
if(from_supernode) {
|
|
/* UDP NAT hole punching through supernode. Send to peer first(punch local UDP hole)
|
|
* and then ask supernode to forward. Supernode then ask peer to ack. Some nat device
|
|
* drop and block ports with incoming UDP packet if out-come traffic does not exist.
|
|
* So we can alternatively set TTL so that the packet sent to peer never really reaches
|
|
* The register_ttl is basically nat level + 1. Set it to 1 means host like DMZ.
|
|
*/
|
|
if(eee->conf.register_ttl == 1) {
|
|
/* We are DMZ host or port is directly accessible. Just let peer to send back the ack */
|
|
#ifndef _WIN32
|
|
} else if(eee->conf.register_ttl > 1) {
|
|
/* Setting register_ttl usually implies that the edge knows the internal net topology
|
|
* clearly, we can apply aggressive port prediction to support incoming Symmetric NAT
|
|
*/
|
|
int curTTL = 0;
|
|
socklen_t lenTTL = sizeof(int);
|
|
n2n_sock_t sock = scan->sock;
|
|
int alter = 16; /* TODO: set by command line or more reliable prediction method */
|
|
|
|
getsockopt(eee->sock, IPPROTO_IP, IP_TTL, (void *) (char *) &curTTL, &lenTTL);
|
|
setsockopt(eee->sock, IPPROTO_IP, IP_TTL,
|
|
(void *) (char *) &eee->conf.register_ttl,
|
|
sizeof(eee->conf.register_ttl));
|
|
for(; alter > 0; alter--, sock.port++) {
|
|
send_register(eee, &sock, mac, N2N_PORT_REG_COOKIE);
|
|
}
|
|
setsockopt(eee->sock, IPPROTO_IP, IP_TTL, (void *) (char *) &curTTL, sizeof(curTTL));
|
|
#endif
|
|
} else { /* eee->conf.register_ttl <= 0 */
|
|
/* Normal STUN */
|
|
send_register(eee, &(scan->sock), mac, N2N_REGULAR_REG_COOKIE);
|
|
}
|
|
send_register(eee, &(eee->curr_sn->sock), mac, N2N_FORWARDED_REG_COOKIE);
|
|
} else {
|
|
/* P2P register, send directly */
|
|
send_register(eee, &(scan->sock), mac, N2N_REGULAR_REG_COOKIE);
|
|
}
|
|
register_with_local_peers(eee);
|
|
} else{
|
|
scan->sock = *peer;
|
|
}
|
|
scan->last_seen = time(NULL);
|
|
if(dev_addr != NULL) {
|
|
memcpy(&(scan->dev_addr), dev_addr, sizeof(n2n_ip_subnet_t));
|
|
}
|
|
if(dev_desc) memcpy(scan->dev_desc, dev_desc, N2N_DESC_SIZE);
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
/** Update the last_seen time for this peer, or get registered. */
|
|
static void check_peer_registration_needed (n2n_edge_t *eee,
|
|
uint8_t from_supernode,
|
|
uint8_t via_multicast,
|
|
const n2n_mac_t mac,
|
|
const n2n_cookie_t cookie,
|
|
const n2n_ip_subnet_t *dev_addr,
|
|
const n2n_desc_t *dev_desc,
|
|
const n2n_sock_t *peer) {
|
|
|
|
struct peer_info *scan;
|
|
|
|
HASH_FIND_PEER(eee->known_peers, mac, scan);
|
|
|
|
/* If we were not able to find it by MAC, we try to find it by socket. */
|
|
if(scan == NULL ) {
|
|
scan = find_peer_by_sock(peer, eee->known_peers);
|
|
|
|
// MAC change
|
|
if(scan) {
|
|
HASH_DEL(eee->known_peers, scan);
|
|
memcpy(scan->mac_addr, mac, sizeof(n2n_mac_t));
|
|
HASH_ADD_PEER(eee->known_peers, scan);
|
|
// reset last_local_reg to allow re-registration
|
|
scan->last_cookie = N2N_NO_REG_COOKIE;
|
|
}
|
|
}
|
|
|
|
if(scan == NULL) {
|
|
/* Not in known_peers - start the REGISTER process. */
|
|
register_with_new_peer(eee, from_supernode, via_multicast, mac, dev_addr, dev_desc, peer);
|
|
} else {
|
|
/* Already in known_peers. */
|
|
time_t now = time(NULL);
|
|
|
|
if(!from_supernode)
|
|
scan->last_p2p = now;
|
|
|
|
if(via_multicast)
|
|
scan->local = 1;
|
|
|
|
if(((now - scan->last_seen) > 0 /* >= 1 sec */)
|
|
||(cookie > scan->last_cookie)) {
|
|
/* Don't register too often */
|
|
check_known_peer_sock_change(eee, from_supernode, via_multicast, mac, dev_addr, dev_desc, peer, now);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
/* Confirm that a pending peer is reachable directly via P2P.
|
|
*
|
|
* peer must be a pointer to an element of the pending_peers list.
|
|
*/
|
|
static void peer_set_p2p_confirmed (n2n_edge_t * eee,
|
|
const n2n_mac_t mac,
|
|
const n2n_cookie_t cookie,
|
|
const n2n_sock_t * peer,
|
|
time_t now) {
|
|
|
|
struct peer_info *scan, *scan_tmp;
|
|
macstr_t mac_buf;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
HASH_FIND_PEER(eee->pending_peers, mac, scan);
|
|
if(scan == NULL) {
|
|
scan = find_peer_by_sock(peer, eee->pending_peers);
|
|
// in case of MAC change, reset last_local_reg to allow re-registration
|
|
if(scan)
|
|
scan->last_cookie = N2N_NO_REG_COOKIE;
|
|
}
|
|
|
|
if(scan) {
|
|
HASH_DEL(eee->pending_peers, scan);
|
|
|
|
scan_tmp = find_peer_by_sock(peer, eee->known_peers);
|
|
if(scan_tmp != NULL) {
|
|
HASH_DEL(eee->known_peers, scan_tmp);
|
|
mgmt_event_post(N2N_EVENT_PEER,N2N_EVENT_PEER_DEL_P2P,scan);
|
|
free(scan);
|
|
scan = scan_tmp;
|
|
memcpy(scan->mac_addr, mac, sizeof(n2n_mac_t));
|
|
// in case of MAC change, reset cookie to allow immediate re-registration
|
|
scan->last_cookie = N2N_NO_REG_COOKIE;
|
|
} else {
|
|
// update sock but ...
|
|
// ... ignore ACKs's (and their socks) from lower ranked inbound ways for a while
|
|
if(((now - scan->last_seen) > REGISTRATION_TIMEOUT / 4)
|
|
||(cookie > scan->last_cookie)) {
|
|
scan->sock = *peer;
|
|
scan->last_cookie = cookie;
|
|
}
|
|
}
|
|
|
|
HASH_ADD_PEER(eee->known_peers, scan);
|
|
scan->last_p2p = now;
|
|
mgmt_event_post(N2N_EVENT_PEER,N2N_EVENT_PEER_ADD_P2P,scan);
|
|
|
|
traceEvent(TRACE_DEBUG, "p2p connection established: %s [%s]",
|
|
macaddr_str(mac_buf, mac),
|
|
sock_to_cstr(sockbuf, peer));
|
|
|
|
traceEvent(TRACE_DEBUG, "new peer %s [%s]",
|
|
macaddr_str(mac_buf, scan->mac_addr),
|
|
sock_to_cstr(sockbuf, &(scan->sock)));
|
|
|
|
traceEvent(TRACE_DEBUG, "pending peers list size=%u",
|
|
HASH_COUNT(eee->pending_peers));
|
|
|
|
traceEvent(TRACE_DEBUG, "known peers list size=%u",
|
|
HASH_COUNT(eee->known_peers));
|
|
|
|
scan->last_seen = now;
|
|
} else
|
|
traceEvent(TRACE_DEBUG, "failed to find sender in pending_peers");
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
// provides the current / a new local auth token
|
|
static int get_local_auth (n2n_edge_t *eee, n2n_auth_t *auth) {
|
|
|
|
switch(eee->conf.auth.scheme) {
|
|
case n2n_auth_simple_id:
|
|
memcpy(auth, &(eee->conf.auth), sizeof(n2n_auth_t));
|
|
break;
|
|
case n2n_auth_user_password:
|
|
// start from the locally stored complete auth token (including type and size fields)
|
|
memcpy(auth, &(eee->conf.auth), sizeof(n2n_auth_t));
|
|
|
|
// the token data consists of
|
|
// 32 bytes public key
|
|
// 16 bytes random challenge
|
|
|
|
// generate a new random auth challenge every time
|
|
memrnd(auth->token + N2N_PRIVATE_PUBLIC_KEY_SIZE, N2N_AUTH_CHALLENGE_SIZE);
|
|
// store it in local auth token (for comparison later)
|
|
memcpy(eee->conf.auth.token + N2N_PRIVATE_PUBLIC_KEY_SIZE, auth->token + N2N_PRIVATE_PUBLIC_KEY_SIZE, N2N_AUTH_CHALLENGE_SIZE);
|
|
// encrypt the challenge for transmission
|
|
speck_128_encrypt(auth->token + N2N_PRIVATE_PUBLIC_KEY_SIZE, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
// handles a returning (remote) auth token, takes action as required by auth scheme
|
|
static int handle_remote_auth (n2n_edge_t *eee, struct peer_info *peer, const n2n_auth_t *remote_auth) {
|
|
|
|
uint8_t tmp_token[N2N_AUTH_MAX_TOKEN_SIZE];
|
|
|
|
switch(eee->conf.auth.scheme) {
|
|
case n2n_auth_simple_id:
|
|
// no action required
|
|
break;
|
|
case n2n_auth_user_password:
|
|
memcpy(tmp_token, remote_auth->token, N2N_AUTH_PW_TOKEN_SIZE);
|
|
|
|
// the returning token data consists of
|
|
// 16 bytes double-encrypted challenge
|
|
// 16 bytes public key (second half)
|
|
// 16 bytes encrypted (original random challenge XOR shared secret XOR dynamic key)
|
|
|
|
// decrypt double-encrypted received challenge (first half of public key field)
|
|
speck_128_decrypt(tmp_token, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
speck_128_decrypt(tmp_token, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
|
|
// compare to original challenge
|
|
if(0 != memcmp(tmp_token, eee->conf.auth.token + N2N_PRIVATE_PUBLIC_KEY_SIZE, N2N_AUTH_CHALLENGE_SIZE))
|
|
return -1;
|
|
|
|
// decrypt the received challenge in which the dynamic key is wrapped
|
|
speck_128_decrypt(tmp_token + N2N_PRIVATE_PUBLIC_KEY_SIZE, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
// un-XOR the original challenge
|
|
memxor(tmp_token + N2N_PRIVATE_PUBLIC_KEY_SIZE, eee->conf.auth.token + N2N_PRIVATE_PUBLIC_KEY_SIZE, N2N_AUTH_CHALLENGE_SIZE);
|
|
// un-XOR the shared secret
|
|
memxor(tmp_token + N2N_PRIVATE_PUBLIC_KEY_SIZE, *(eee->conf.shared_secret), N2N_AUTH_CHALLENGE_SIZE);
|
|
// setup for use as dynamic key
|
|
packet_header_change_dynamic_key(tmp_token + N2N_PRIVATE_PUBLIC_KEY_SIZE,
|
|
&(eee->conf.header_encryption_ctx_dynamic),
|
|
&(eee->conf.header_iv_ctx_dynamic));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
int is_empty_ip_address (const n2n_sock_t * sock) {
|
|
|
|
const uint8_t * ptr = NULL;
|
|
size_t len = 0;
|
|
size_t i;
|
|
|
|
if(AF_INET6 == sock->family) {
|
|
ptr = sock->addr.v6;
|
|
len = 16;
|
|
} else {
|
|
ptr = sock->addr.v4;
|
|
len = 4;
|
|
}
|
|
|
|
for(i = 0; i < len; ++i) {
|
|
if(0 != ptr[i]) {
|
|
/* found a non-zero byte in address */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
/** Check if a known peer socket has changed and possibly register again.
|
|
*/
|
|
static void check_known_peer_sock_change (n2n_edge_t *eee,
|
|
uint8_t from_supernode,
|
|
uint8_t via_multicast,
|
|
const n2n_mac_t mac,
|
|
const n2n_ip_subnet_t *dev_addr,
|
|
const n2n_desc_t *dev_desc,
|
|
const n2n_sock_t *peer,
|
|
time_t when) {
|
|
|
|
struct peer_info *scan;
|
|
n2n_sock_str_t sockbuf1;
|
|
n2n_sock_str_t sockbuf2; /* don't clobber sockbuf1 if writing two addresses to trace */
|
|
macstr_t mac_buf;
|
|
|
|
if(is_empty_ip_address(peer))
|
|
return;
|
|
|
|
if(is_multi_broadcast(mac))
|
|
return;
|
|
|
|
/* Search the peer in known_peers */
|
|
HASH_FIND_PEER(eee->known_peers, mac, scan);
|
|
|
|
if(!scan)
|
|
/* Not in known_peers */
|
|
return;
|
|
|
|
if(!sock_equal(&(scan->sock), peer)) {
|
|
if(!from_supernode) {
|
|
/* This is a P2P packet */
|
|
traceEvent(TRACE_NORMAL, "peer %s changed [%s] -> [%s]",
|
|
macaddr_str(mac_buf, scan->mac_addr),
|
|
sock_to_cstr(sockbuf1, &(scan->sock)),
|
|
sock_to_cstr(sockbuf2, peer));
|
|
/* The peer has changed public socket. It can no longer be assumed to be reachable. */
|
|
HASH_DEL(eee->known_peers, scan);
|
|
mgmt_event_post(N2N_EVENT_PEER,N2N_EVENT_PEER_DEL_P2P,scan);
|
|
free(scan);
|
|
|
|
register_with_new_peer(eee, from_supernode, via_multicast, mac, dev_addr, dev_desc, peer);
|
|
} else {
|
|
/* Don't worry about what the supernode reports, it could be seeing a different socket. */
|
|
}
|
|
} else
|
|
scan->last_seen = when;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/*
|
|
* Confirm that we can send to this edge.
|
|
* TODO: for the TCP case, this could cause a stall in the packet
|
|
* send path, so this probably should be reworked to use a queue
|
|
*/
|
|
static int check_sock_ready (n2n_edge_t *eee) {
|
|
// if required (tcp), wait until writeable as soket is set to
|
|
// O_NONBLOCK, could require some wait time directly after re-opening
|
|
if(eee->conf.connect_tcp) {
|
|
fd_set socket_mask;
|
|
struct timeval wait_time;
|
|
|
|
FD_ZERO(&socket_mask);
|
|
FD_SET(eee->sock, &socket_mask);
|
|
wait_time.tv_sec = 0;
|
|
wait_time.tv_usec = 500000;
|
|
return select(eee->sock + 1, NULL, &socket_mask, NULL, &wait_time);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/** Send a datagram to a socket file descriptor */
|
|
static ssize_t sendto_fd (n2n_edge_t *eee, const void *buf,
|
|
size_t len, struct sockaddr_in *dest,
|
|
const n2n_sock_t * n2ndest) {
|
|
|
|
ssize_t sent = 0;
|
|
|
|
if(check_sock_ready(eee) < 1) {
|
|
goto err_out;
|
|
}
|
|
|
|
sent = sendto(eee->sock, buf, len, 0 /*flags*/,
|
|
(struct sockaddr *)dest, sizeof(struct sockaddr_in));
|
|
|
|
if(sent != -1) {
|
|
// sendto success
|
|
traceEvent(TRACE_DEBUG, "sent=%d", (signed int)sent);
|
|
return sent;
|
|
}
|
|
|
|
// We only get here if sendto failed, so errno must be valid
|
|
|
|
char * errstr = strerror(errno);
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
if(!errstr) {
|
|
traceEvent(TRACE_WARNING, "bad strerror");
|
|
}
|
|
|
|
int level = TRACE_WARNING;
|
|
// downgrade to TRACE_DEBUG in case of custom AF_INVALID,
|
|
// i.e. supernode not resolved yet
|
|
if(errno == EAFNOSUPPORT /* 93 */) {
|
|
level = TRACE_DEBUG;
|
|
}
|
|
|
|
traceEvent(level, "sendto(%s) failed (%d) %s",
|
|
sock_to_cstr(sockbuf, n2ndest),
|
|
errno, errstr);
|
|
#ifdef _WIN32
|
|
traceEvent(level, "WSAGetLastError(): %u", WSAGetLastError());
|
|
#endif
|
|
|
|
/*
|
|
* we get here if the sock is not ready or
|
|
* if the sendto had an error
|
|
*/
|
|
err_out:
|
|
if(eee->conf.connect_tcp) {
|
|
supernode_disconnect(eee);
|
|
eee->sn_wait = 1;
|
|
traceEvent(TRACE_DEBUG, "error in sendto_fd");
|
|
}
|
|
|
|
/*
|
|
* If we got an error and are using UDP, this is still an error
|
|
* case. The only caller of sendto_fd() checks the return only
|
|
* in the TCP case.
|
|
*
|
|
* Thus, we can safely return an error code for any error.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
|
|
/** Send a datagram to a socket defined by a n2n_sock_t */
|
|
static void sendto_sock (n2n_edge_t *eee, const void * buf,
|
|
size_t len, const n2n_sock_t * dest) {
|
|
|
|
struct sockaddr_in peer_addr;
|
|
ssize_t sent;
|
|
int value = 0;
|
|
|
|
// TODO: audit callers and confirm if this can ever happen
|
|
if(!eee) {
|
|
traceEvent(TRACE_WARNING, "bad eee");
|
|
return;
|
|
}
|
|
|
|
if(!dest->family)
|
|
// invalid socket
|
|
return;
|
|
|
|
if(eee->sock < 0)
|
|
// invalid socket file descriptor, e.g. TCP unconnected has fd of '-1'
|
|
return;
|
|
|
|
// network order socket
|
|
fill_sockaddr((struct sockaddr *) &peer_addr, sizeof(peer_addr), dest);
|
|
|
|
// if the connection is tcp, i.e. not the regular sock...
|
|
if(eee->conf.connect_tcp) {
|
|
|
|
setsockopt(eee->sock, IPPROTO_TCP, TCP_NODELAY, (void *)&value, sizeof(value));
|
|
value = 1;
|
|
#ifdef LINUX
|
|
setsockopt(eee->sock, IPPROTO_TCP, TCP_CORK, &value, sizeof(value));
|
|
#endif
|
|
|
|
// prepend packet length...
|
|
uint16_t pktsize16 = htobe16(len);
|
|
sent = sendto_fd(eee, (uint8_t*)&pktsize16, sizeof(pktsize16), &peer_addr, dest);
|
|
|
|
if(sent <= 0)
|
|
return;
|
|
// ...before sending the actual data
|
|
}
|
|
sent = sendto_fd(eee, buf, len, &peer_addr, dest);
|
|
|
|
// if the connection is tcp, i.e. not the regular sock...
|
|
if(eee->conf.connect_tcp) {
|
|
value = 1; /* value should still be set to 1 */
|
|
setsockopt(eee->sock, IPPROTO_TCP, TCP_NODELAY, (void *)&value, sizeof(value));
|
|
#ifdef LINUX
|
|
value = 0;
|
|
setsockopt(eee->sock, IPPROTO_TCP, TCP_CORK, &value, sizeof(value));
|
|
#endif
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
/* Bind eee->udp_multicast_sock to multicast group */
|
|
static void check_join_multicast_group (n2n_edge_t *eee) {
|
|
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if((eee->conf.allow_p2p)
|
|
&& (eee->conf.preferred_sock.family == (uint8_t)AF_INVALID)) {
|
|
if(!eee->multicast_joined) {
|
|
struct ip_mreq mreq;
|
|
mreq.imr_multiaddr.s_addr = inet_addr(N2N_MULTICAST_GROUP);
|
|
#ifdef _WIN32
|
|
dec_ip_str_t ip_addr;
|
|
get_best_interface_ip(eee, &ip_addr);
|
|
mreq.imr_interface.s_addr = inet_addr(ip_addr);
|
|
#else
|
|
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
|
|
#endif
|
|
|
|
if(setsockopt(eee->udp_multicast_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) < 0) {
|
|
traceEvent(TRACE_WARNING, "failed to bind to local multicast group %s:%u [errno %u]",
|
|
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT, errno);
|
|
|
|
#ifdef _WIN32
|
|
traceEvent(TRACE_WARNING, "WSAGetLastError(): %u", WSAGetLastError());
|
|
#endif
|
|
} else {
|
|
traceEvent(TRACE_NORMAL, "successfully joined multicast group %s:%u",
|
|
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT);
|
|
eee->multicast_joined = 1;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Send a QUERY_PEER packet to the current supernode. */
|
|
void send_query_peer (n2n_edge_t * eee,
|
|
const n2n_mac_t dst_mac) {
|
|
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE];
|
|
size_t idx;
|
|
n2n_common_t cmn = {0};
|
|
n2n_QUERY_PEER_t query = {0};
|
|
struct peer_info *peer, *tmp;
|
|
int n_o_pings = 0;
|
|
int n_o_top_sn = 0;
|
|
int n_o_rest_sn = 0;
|
|
int n_o_skip_sn = 0;
|
|
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_query_peer;
|
|
cmn.flags = 0;
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
|
|
idx = 0;
|
|
encode_mac(query.srcMac, &idx, eee->device.mac_addr);
|
|
|
|
idx = 0;
|
|
encode_mac(query.targetMac, &idx, dst_mac);
|
|
|
|
idx = 0;
|
|
encode_QUERY_PEER(pktbuf, &idx, &cmn, &query);
|
|
|
|
if(!is_null_mac(dst_mac)) {
|
|
|
|
traceEvent(TRACE_DEBUG, "send QUERY_PEER to supernode");
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
}
|
|
|
|
sendto_sock(eee, pktbuf, idx, &(eee->curr_sn->sock));
|
|
|
|
} else {
|
|
traceEvent(TRACE_DEBUG, "send PING to supernodes");
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
}
|
|
|
|
n_o_pings = eee->conf.number_max_sn_pings;
|
|
eee->conf.number_max_sn_pings = NUMBER_SN_PINGS_REGULAR;
|
|
|
|
// ping the 'floor(n/2)' top supernodes and 'ceiling(n/2)' of the remaining
|
|
n_o_top_sn = n_o_pings >> 1;
|
|
n_o_rest_sn = (n_o_pings + 1) >> 1;
|
|
|
|
// skip a random number of supernodes between top and remaining
|
|
n_o_skip_sn = HASH_COUNT(eee->conf.supernodes) - n_o_pings;
|
|
n_o_skip_sn = (n_o_skip_sn < 0) ? 0 : n2n_rand_sqr(n_o_skip_sn);
|
|
HASH_ITER(hh, eee->conf.supernodes, peer, tmp) {
|
|
if(n_o_top_sn) {
|
|
n_o_top_sn--;
|
|
// fall through (send to top supernode)
|
|
} else if(n_o_skip_sn) {
|
|
n_o_skip_sn--;
|
|
// skip (do not send)
|
|
continue;
|
|
} else if(n_o_rest_sn) {
|
|
n_o_rest_sn--;
|
|
// fall through (send to remaining supernode)
|
|
} else {
|
|
// done with the remaining (do not send anymore)
|
|
break;
|
|
}
|
|
sendto_sock(eee, pktbuf, idx, &(peer->sock));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ******************************************************** */
|
|
|
|
/** Send a REGISTER_SUPER packet to the current supernode. */
|
|
void send_register_super (n2n_edge_t *eee) {
|
|
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE] = {0};
|
|
uint8_t hash_buf[16] = {0};
|
|
size_t idx;
|
|
/* ssize_t sent; */
|
|
n2n_common_t cmn;
|
|
n2n_REGISTER_SUPER_t reg;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
memset(&cmn, 0, sizeof(cmn));
|
|
memset(®, 0, sizeof(reg));
|
|
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_register_super;
|
|
if(eee->conf.preferred_sock.family == (uint8_t)AF_INVALID) {
|
|
cmn.flags = 0;
|
|
} else {
|
|
cmn.flags = N2N_FLAGS_SOCKET;
|
|
memcpy(&(reg.sock), &(eee->conf.preferred_sock), sizeof(n2n_sock_t));
|
|
}
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
|
|
eee->curr_sn->last_cookie = n2n_rand();
|
|
|
|
reg.cookie = eee->curr_sn->last_cookie;
|
|
reg.dev_addr.net_addr = ntohl(eee->device.ip_addr);
|
|
reg.dev_addr.net_bitlen = mask2bitlen(ntohl(eee->device.device_mask));
|
|
memcpy(reg.dev_desc, eee->conf.dev_desc, N2N_DESC_SIZE);
|
|
get_local_auth(eee, &(reg.auth));
|
|
|
|
idx = 0;
|
|
encode_mac(reg.edgeMac, &idx, eee->device.mac_addr);
|
|
|
|
idx = 0;
|
|
encode_REGISTER_SUPER(pktbuf, &idx, &cmn, ®);
|
|
|
|
traceEvent(TRACE_DEBUG, "send REGISTER_SUPER to [%s]",
|
|
sock_to_cstr(sockbuf, &(eee->curr_sn->sock)));
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_static, eee->conf.header_iv_ctx_static,
|
|
time_stamp());
|
|
|
|
if(eee->conf.shared_secret) {
|
|
pearson_hash_128(hash_buf, pktbuf, idx);
|
|
speck_128_encrypt(hash_buf, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
encode_buf(pktbuf, &idx, hash_buf, N2N_REG_SUP_HASH_CHECK_LEN);
|
|
}
|
|
}
|
|
|
|
sendto_sock(eee, pktbuf, idx, &(eee->curr_sn->sock));
|
|
}
|
|
|
|
|
|
static void send_unregister_super (n2n_edge_t *eee) {
|
|
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE] = {0};
|
|
size_t idx;
|
|
/* ssize_t sent; */
|
|
n2n_common_t cmn;
|
|
n2n_UNREGISTER_SUPER_t unreg;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
memset(&cmn, 0, sizeof(cmn));
|
|
memset(&unreg, 0, sizeof(unreg));
|
|
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_unregister_super;
|
|
cmn.flags = 0;
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
get_local_auth(eee, &(unreg.auth));
|
|
|
|
idx = 0;
|
|
encode_mac(unreg.srcMac, &idx, eee->device.mac_addr);
|
|
|
|
idx = 0;
|
|
encode_UNREGISTER_SUPER(pktbuf, &idx, &cmn, &unreg);
|
|
|
|
traceEvent(TRACE_DEBUG, "send UNREGISTER_SUPER to [%s]",
|
|
sock_to_cstr(sockbuf, &(eee->curr_sn->sock)));
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED)
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
|
|
sendto_sock(eee, pktbuf, idx, &(eee->curr_sn->sock));
|
|
|
|
}
|
|
|
|
|
|
static int sort_supernodes (n2n_edge_t *eee, time_t now) {
|
|
|
|
struct peer_info *scan, *tmp;
|
|
|
|
if(now - eee->last_sweep > SWEEP_TIME) {
|
|
// this routine gets periodically called
|
|
|
|
if(!eee->sn_wait) {
|
|
// sort supernodes in ascending order of their selection_criterion fields
|
|
sn_selection_sort(&(eee->conf.supernodes));
|
|
}
|
|
|
|
if(eee->curr_sn != eee->conf.supernodes) {
|
|
// we have not been connected to the best/top one
|
|
send_unregister_super(eee);
|
|
eee->curr_sn = eee->conf.supernodes;
|
|
reset_sup_attempts(eee);
|
|
supernode_connect(eee);
|
|
|
|
traceEvent(TRACE_INFO, "registering with supernode [%s][number of supernodes %d][attempts left %u]",
|
|
supernode_ip(eee), HASH_COUNT(eee->conf.supernodes), (unsigned int)eee->sup_attempts);
|
|
|
|
send_register_super(eee);
|
|
eee->last_register_req = now;
|
|
eee->sn_wait = 1;
|
|
}
|
|
|
|
HASH_ITER(hh, eee->conf.supernodes, scan, tmp) {
|
|
if(scan == eee->curr_sn)
|
|
sn_selection_criterion_good(&(scan->selection_criterion));
|
|
else
|
|
sn_selection_criterion_default(&(scan->selection_criterion));
|
|
}
|
|
sn_selection_criterion_common_data_default(eee);
|
|
|
|
// send PING to all the supernodes
|
|
if(!eee->conf.connect_tcp)
|
|
send_query_peer(eee, null_mac);
|
|
eee->last_sweep = now;
|
|
|
|
// no answer yet (so far, unused in regular edge code; mainly used during bootstrap loading)
|
|
eee->sn_pong = 0;
|
|
}
|
|
|
|
return 0; /* OK */
|
|
}
|
|
|
|
/** Send a REGISTER packet to another edge. */
|
|
static void send_register (n2n_edge_t * eee,
|
|
const n2n_sock_t * remote_peer,
|
|
const n2n_mac_t peer_mac,
|
|
const n2n_cookie_t cookie) {
|
|
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE];
|
|
size_t idx;
|
|
/* ssize_t sent; */
|
|
n2n_common_t cmn;
|
|
n2n_REGISTER_t reg;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
if(!eee->conf.allow_p2p) {
|
|
traceEvent(TRACE_DEBUG, "skipping register as P2P is disabled");
|
|
return;
|
|
}
|
|
|
|
memset(&cmn, 0, sizeof(cmn));
|
|
memset(®, 0, sizeof(reg));
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_register;
|
|
cmn.flags = 0;
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
|
|
reg.cookie = cookie;
|
|
idx = 0;
|
|
encode_mac(reg.srcMac, &idx, eee->device.mac_addr);
|
|
|
|
if(peer_mac) {
|
|
// can be NULL for multicast registrations
|
|
idx = 0;
|
|
encode_mac(reg.dstMac, &idx, peer_mac);
|
|
}
|
|
reg.dev_addr.net_addr = ntohl(eee->device.ip_addr);
|
|
reg.dev_addr.net_bitlen = mask2bitlen(ntohl(eee->device.device_mask));
|
|
memcpy(reg.dev_desc, eee->conf.dev_desc, N2N_DESC_SIZE);
|
|
|
|
idx = 0;
|
|
encode_REGISTER(pktbuf, &idx, &cmn, ®);
|
|
|
|
traceEvent(TRACE_INFO, "send REGISTER to [%s]",
|
|
sock_to_cstr(sockbuf, remote_peer));
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED)
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
|
|
sendto_sock(eee, pktbuf, idx, remote_peer);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Send a REGISTER_ACK packet to a peer edge. */
|
|
static void send_register_ack (n2n_edge_t * eee,
|
|
const n2n_sock_t * remote_peer,
|
|
const n2n_REGISTER_t * reg) {
|
|
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE];
|
|
size_t idx;
|
|
/* ssize_t sent; */
|
|
n2n_common_t cmn;
|
|
n2n_REGISTER_ACK_t ack;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
if(!eee->conf.allow_p2p) {
|
|
traceEvent(TRACE_DEBUG, "skipping register ACK as P2P is disabled");
|
|
return;
|
|
}
|
|
|
|
memset(&cmn, 0, sizeof(cmn));
|
|
memset(&ack, 0, sizeof(reg));
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_register_ack;
|
|
cmn.flags = 0;
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
|
|
memset(&ack, 0, sizeof(ack));
|
|
ack.cookie = reg->cookie;
|
|
memcpy(ack.srcMac, eee->device.mac_addr, N2N_MAC_SIZE);
|
|
memcpy(ack.dstMac, reg->srcMac, N2N_MAC_SIZE);
|
|
|
|
idx = 0;
|
|
encode_REGISTER_ACK(pktbuf, &idx, &cmn, &ack);
|
|
|
|
traceEvent(TRACE_INFO, "send REGISTER_ACK to [%s]",
|
|
sock_to_cstr(sockbuf, remote_peer));
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED)
|
|
packet_header_encrypt(pktbuf, idx, idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
|
|
sendto_sock(eee, pktbuf, idx, remote_peer);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
static char gratuitous_arp[] = {
|
|
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* dest MAC */
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* src MAC */
|
|
0x08, 0x06, /* ARP */
|
|
0x00, 0x01, /* ethernet */
|
|
0x08, 0x00, /* IP */
|
|
0x06, /* hw Size */
|
|
0x04, /* protocol Size */
|
|
0x00, 0x02, /* ARP reply */
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* src MAC */
|
|
0x00, 0x00, 0x00, 0x00, /* src IP */
|
|
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* target MAC */
|
|
0x00, 0x00, 0x00, 0x00 /* target IP */
|
|
};
|
|
|
|
// build a gratuitous ARP packet */
|
|
static int build_gratuitous_arp (n2n_edge_t * eee, char *buffer, uint16_t buffer_len) {
|
|
|
|
if(buffer_len < sizeof(gratuitous_arp)) return(-1);
|
|
|
|
memcpy(buffer, gratuitous_arp, sizeof(gratuitous_arp));
|
|
memcpy(&buffer[6], eee->device.mac_addr, 6);
|
|
memcpy(&buffer[22], eee->device.mac_addr, 6);
|
|
memcpy(&buffer[28], &(eee->device.ip_addr), 4);
|
|
memcpy(&buffer[38], &(eee->device.ip_addr), 4);
|
|
|
|
return(sizeof(gratuitous_arp));
|
|
}
|
|
|
|
/** Called from update_supernode_reg to periodically send gratuitous ARP
|
|
* broadcasts. */
|
|
static void send_grat_arps (n2n_edge_t * eee) {
|
|
|
|
uint8_t buffer[48];
|
|
size_t len;
|
|
|
|
traceEvent(TRACE_DEBUG, "sending gratuitous ARP...");
|
|
len = build_gratuitous_arp(eee, (char*)buffer, sizeof(buffer));
|
|
|
|
edge_send_packet2net(eee, buffer, len);
|
|
edge_send_packet2net(eee, buffer, len); /* Two is better than one :-) */
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** @brief Check to see if we should re-register with the supernode.
|
|
*
|
|
* This is frequently called by the main loop.
|
|
*/
|
|
void update_supernode_reg (n2n_edge_t * eee, time_t now) {
|
|
|
|
struct peer_info *peer, *tmp_peer;
|
|
int cnt = 0;
|
|
int off = 0;
|
|
|
|
if((eee->sn_wait && (now > (eee->last_register_req + (eee->conf.register_interval / 10))))
|
|
||(eee->sn_wait == 2)) /* immediately re-register in case of RE_REGISTER_SUPER */ {
|
|
/* fall through */
|
|
traceEvent(TRACE_DEBUG, "update_supernode_reg: doing fast retry.");
|
|
} else if(now < (eee->last_register_req + eee->conf.register_interval))
|
|
return; /* Too early */
|
|
|
|
// determine time offset to apply on last_register_req for
|
|
// all edges's next re-registration does not happen all at once
|
|
if(eee->sn_wait == 2) {
|
|
// remaining 1/4 is greater than 1/10 fast retry allowance;
|
|
// '%' might be expensive but does not happen all too often
|
|
off = n2n_rand() % ((eee->conf.register_interval * 3) / 4);
|
|
}
|
|
|
|
check_join_multicast_group(eee);
|
|
|
|
if(0 == eee->sup_attempts) {
|
|
/* Give up on that supernode and try the next one. */
|
|
sn_selection_criterion_bad(&(eee->curr_sn->selection_criterion));
|
|
sn_selection_sort(&(eee->conf.supernodes));
|
|
eee->curr_sn = eee->conf.supernodes;
|
|
traceEvent(TRACE_WARNING, "supernode not responding, now trying [%s]", supernode_ip(eee));
|
|
reset_sup_attempts(eee);
|
|
// trigger out-of-schedule DNS resolution
|
|
eee->resolution_request = 1;
|
|
|
|
// in some multi-NATed scenarios communication gets stuck on losing connection to supernode
|
|
// closing and re-opening the socket allows for re-establishing communication
|
|
// this can only be done, if working on some unprivileged port and/or having sufficent
|
|
// privileges. as we are not able to check for sufficent privileges here, we only do it
|
|
// if port is sufficently high or unset. uncovered: privileged port and sufficent privileges
|
|
if((eee->conf.local_port == 0) || (eee->conf.local_port > 1024)) {
|
|
// do not explicitly disconnect every time as the condition described is rare, so ...
|
|
// ... check that there are no external peers (indicating a working socket) ...
|
|
HASH_ITER(hh, eee->known_peers, peer, tmp_peer)
|
|
if(!peer->local) {
|
|
cnt++;
|
|
break;
|
|
}
|
|
if(!cnt) {
|
|
// ... and then count the connection retries
|
|
(eee->close_socket_counter)++;
|
|
if(eee->close_socket_counter >= N2N_CLOSE_SOCKET_COUNTER_MAX) {
|
|
eee->close_socket_counter = 0;
|
|
supernode_disconnect(eee);
|
|
}
|
|
}
|
|
|
|
traceEvent(TRACE_DEBUG, "reconnected to supernode");
|
|
}
|
|
supernode_connect(eee);
|
|
|
|
} else {
|
|
--(eee->sup_attempts);
|
|
}
|
|
|
|
#ifndef HAVE_LIBPTHREAD
|
|
if(supernode2sock(&(eee->curr_sn->sock), eee->curr_sn->ip_addr) == 0) {
|
|
#endif
|
|
traceEvent(TRACE_INFO, "registering with supernode [%s][number of supernodes %d][attempts left %u]",
|
|
supernode_ip(eee), HASH_COUNT(eee->conf.supernodes), (unsigned int)eee->sup_attempts);
|
|
|
|
send_register_super(eee);
|
|
#ifndef HAVE_LIBPTHREAD
|
|
}
|
|
#endif
|
|
|
|
register_with_local_peers(eee);
|
|
|
|
// if supernode repeatedly not responding (already waiting), safeguard the
|
|
// current known connections to peers by re-registering
|
|
if(eee->sn_wait == 1)
|
|
HASH_ITER(hh, eee->known_peers, peer, tmp_peer)
|
|
if((now - peer->last_seen) > REGISTER_SUPER_INTERVAL_DFL)
|
|
send_register(eee, &(peer->sock), peer->mac_addr, peer->last_cookie);
|
|
|
|
eee->sn_wait = 1;
|
|
|
|
eee->last_register_req = now - off;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Return the IP address of the current supernode in the ring. */
|
|
static const char * supernode_ip (const n2n_edge_t * eee) {
|
|
|
|
return (eee->curr_sn->ip_addr);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** A PACKET has arrived containing an encapsulated ethernet datagram - usually
|
|
* encrypted. */
|
|
static int handle_PACKET (n2n_edge_t * eee,
|
|
const uint8_t from_supernode,
|
|
const n2n_PACKET_t * pkt,
|
|
const n2n_sock_t * orig_sender,
|
|
uint8_t * payload,
|
|
size_t psize) {
|
|
|
|
ssize_t data_sent_len;
|
|
uint8_t * eth_payload = NULL;
|
|
int retval = -1;
|
|
time_t now;
|
|
ether_hdr_t * eh;
|
|
ipstr_t ip_buf;
|
|
macstr_t mac_buf;
|
|
n2n_sock_str_t sockbuf;
|
|
|
|
now = time(NULL);
|
|
|
|
traceEvent(TRACE_DEBUG, "handle_PACKET size %u transform %u",
|
|
(unsigned int)psize, (unsigned int)pkt->transform);
|
|
/* hexdump(payload, psize); */
|
|
|
|
if(from_supernode) {
|
|
if(is_multi_broadcast(pkt->dstMac))
|
|
++(eee->stats.rx_sup_broadcast);
|
|
|
|
++(eee->stats.rx_sup);
|
|
eee->last_sup = now;
|
|
} else {
|
|
++(eee->stats.rx_p2p);
|
|
eee->last_p2p=now;
|
|
}
|
|
|
|
/* Handle transform. */
|
|
{
|
|
uint8_t decode_buf[N2N_PKT_BUF_SIZE];
|
|
uint8_t deflate_buf[N2N_PKT_BUF_SIZE];
|
|
size_t eth_size;
|
|
n2n_transform_t rx_transop_id;
|
|
uint8_t rx_compression_id;
|
|
|
|
rx_transop_id = (n2n_transform_t)pkt->transform;
|
|
rx_compression_id = pkt->compression;
|
|
|
|
if(rx_transop_id == eee->conf.transop_id) {
|
|
uint8_t is_multicast;
|
|
// decrypt
|
|
eth_payload = decode_buf;
|
|
eth_size = eee->transop.rev(&eee->transop,
|
|
eth_payload, N2N_PKT_BUF_SIZE,
|
|
payload, psize, pkt->srcMac);
|
|
++(eee->transop.rx_cnt); /* stats */
|
|
|
|
/* decompress if necessary */
|
|
size_t deflate_len;
|
|
|
|
switch(rx_compression_id) {
|
|
case N2N_COMPRESSION_ID_NONE:
|
|
break; // continue afterwards
|
|
|
|
case N2N_COMPRESSION_ID_LZO:
|
|
deflate_len = eee->transop_lzo.rev(&eee->transop_lzo,
|
|
deflate_buf, N2N_PKT_BUF_SIZE,
|
|
decode_buf, eth_size, pkt->srcMac);
|
|
break;
|
|
|
|
#ifdef HAVE_ZSTD
|
|
case N2N_COMPRESSION_ID_ZSTD:
|
|
deflate_len = eee->transop_zstd.rev(&eee->transop_zstd,
|
|
deflate_buf, N2N_PKT_BUF_SIZE,
|
|
decode_buf, eth_size, pkt->srcMac);
|
|
break;
|
|
#endif
|
|
default:
|
|
traceEvent(TRACE_WARNING, "payload decompression failed: received packet indicating unsupported %s compression.",
|
|
compression_str(rx_compression_id));
|
|
return(-1); // cannot handle it
|
|
}
|
|
|
|
if(rx_compression_id != N2N_COMPRESSION_ID_NONE) {
|
|
traceEvent(TRACE_DEBUG, "payload decompression %s: deflated %u bytes to %u bytes",
|
|
compression_str(rx_compression_id), eth_size, (int)deflate_len);
|
|
eth_payload = deflate_buf;
|
|
eth_size = deflate_len;
|
|
}
|
|
eh = (ether_hdr_t*)eth_payload;
|
|
|
|
is_multicast = (is_ip6_discovery(eth_payload, eth_size) || is_ethMulticast(eth_payload, eth_size));
|
|
|
|
if(eee->conf.drop_multicast && is_multicast) {
|
|
traceEvent(TRACE_INFO, "dropping RX multicast");
|
|
return(-1);
|
|
} else if((!eee->conf.allow_routing) && (!is_multicast)) {
|
|
/* Check if it is a routed packet */
|
|
|
|
if((ntohs(eh->type) == 0x0800) && (eth_size >= ETH_FRAMESIZE + IP4_MIN_SIZE)) {
|
|
|
|
uint32_t *dst = (uint32_t*)ð_payload[ETH_FRAMESIZE + IP4_DSTOFFSET];
|
|
uint8_t *dst_mac = (uint8_t*)eth_payload;
|
|
|
|
/* Note: all elements of the_ip are in network order */
|
|
if(!memcmp(dst_mac, broadcast_mac, N2N_MAC_SIZE))
|
|
traceEvent(TRACE_DEBUG, "RX broadcast packet destined to [%s]",
|
|
intoa(ntohl(*dst), ip_buf, sizeof(ip_buf)));
|
|
else if((*dst != eee->device.ip_addr)) {
|
|
/* This is a packet that needs to be routed */
|
|
traceEvent(TRACE_INFO, "discarding routed packet destined to [%s]",
|
|
intoa(ntohl(*dst), ip_buf, sizeof(ip_buf)));
|
|
return(-1);
|
|
} else {
|
|
/* This packet is directed to us */
|
|
/* traceEvent(TRACE_INFO, "Sending non-routed packet"); */
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_BRIDGING_SUPPORT
|
|
if((eee->conf.allow_routing) && (!is_multi_broadcast(eh->shost))) {
|
|
struct host_info *host = NULL;
|
|
|
|
HASH_FIND(hh, eee->known_hosts, eh->shost, sizeof(n2n_mac_t), host);
|
|
if(host == NULL) {
|
|
struct host_info *host = calloc(1, sizeof(struct host_info));
|
|
memcpy(host->mac_addr, eh->shost, sizeof(n2n_mac_t));
|
|
memcpy(host->edge_addr, pkt->srcMac, sizeof(n2n_mac_t));
|
|
host->last_seen = now;
|
|
HASH_ADD(hh, eee->known_hosts, mac_addr, sizeof(n2n_mac_t), host);
|
|
} else {
|
|
memcpy(host->edge_addr, pkt->srcMac, sizeof(n2n_mac_t));
|
|
host->last_seen = now;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(eee->network_traffic_filter->filter_packet_from_peer(eee->network_traffic_filter, eee, orig_sender,
|
|
eth_payload, eth_size) == N2N_DROP) {
|
|
traceEvent(TRACE_DEBUG, "filtered packet of size %u", (unsigned int)eth_size);
|
|
return(0);
|
|
}
|
|
|
|
if(eee->cb.packet_from_peer) {
|
|
uint16_t tmp_eth_size = eth_size;
|
|
if(eee->cb.packet_from_peer(eee, orig_sender, eth_payload, &tmp_eth_size) == N2N_DROP) {
|
|
traceEvent(TRACE_DEBUG, "DROP packet of size %u", (unsigned int)eth_size);
|
|
return(0);
|
|
}
|
|
eth_size = tmp_eth_size;
|
|
}
|
|
|
|
/* Write ethernet packet to tap device. */
|
|
traceEvent(TRACE_DEBUG, "sending data of size %u to TAP", (unsigned int)eth_size);
|
|
data_sent_len = tuntap_write(&(eee->device), eth_payload, eth_size);
|
|
|
|
if(data_sent_len == eth_size) {
|
|
retval = 0;
|
|
}
|
|
} else {
|
|
traceEvent(TRACE_WARNING, "invalid transop ID: expected %s (%u), got %s (%u) from %s [%s]",
|
|
transop_str(eee->conf.transop_id), eee->conf.transop_id,
|
|
transop_str(rx_transop_id), rx_transop_id,
|
|
macaddr_str(mac_buf, pkt->srcMac),
|
|
sock_to_cstr(sockbuf, orig_sender));
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
#if 0
|
|
#ifndef _WIN32
|
|
|
|
static char *get_ip_from_arp (dec_ip_str_t buf, const n2n_mac_t req_mac) {
|
|
|
|
FILE *fd;
|
|
dec_ip_str_t ip_str = {'\0'};
|
|
devstr_t dev_str = {'\0'};
|
|
macstr_t mac_str = {'\0'};
|
|
n2n_mac_t mac = {'\0'};
|
|
|
|
strncpy(buf, "0.0.0.0", N2N_NETMASK_STR_SIZE - 1);
|
|
|
|
if(is_null_mac(req_mac)) {
|
|
traceEvent(TRACE_DEBUG, "MAC address is null.");
|
|
return buf;
|
|
}
|
|
|
|
if(!(fd = fopen("/proc/net/arp", "r"))) {
|
|
traceEvent(TRACE_WARNING, "could not open arp table: %d - %s", errno, strerror(errno));
|
|
return buf;
|
|
}
|
|
|
|
while(!feof(fd) && fgetc(fd) != '\n');
|
|
while(!feof(fd) && (fscanf(fd, " %15[0-9.] %*s %*s %17[A-Fa-f0-9:] %*s %15s", ip_str, mac_str, dev_str) == 3)) {
|
|
str2mac(mac, mac_str);
|
|
if(0 == memcmp(mac, req_mac, sizeof(n2n_mac_t))) {
|
|
strncpy(buf, ip_str, N2N_NETMASK_STR_SIZE - 1);
|
|
break;
|
|
}
|
|
}
|
|
fclose(fd);
|
|
|
|
return buf;
|
|
}
|
|
|
|
#endif
|
|
#endif
|
|
|
|
/* ************************************** */
|
|
|
|
static int check_query_peer_info (n2n_edge_t *eee, time_t now, n2n_mac_t mac) {
|
|
|
|
struct peer_info *scan;
|
|
|
|
HASH_FIND_PEER(eee->pending_peers, mac, scan);
|
|
|
|
if(!scan) {
|
|
scan = calloc(1, sizeof(struct peer_info));
|
|
|
|
memcpy(scan->mac_addr, mac, N2N_MAC_SIZE);
|
|
scan->timeout = eee->conf.register_interval; /* TODO: should correspond to the peer supernode registration timeout */
|
|
scan->last_seen = now; /* Don't change this it marks the pending peer for removal. */
|
|
scan->last_valid_time_stamp = initial_time_stamp();
|
|
|
|
HASH_ADD_PEER(eee->pending_peers, scan);
|
|
}
|
|
|
|
if(now - scan->last_sent_query > eee->conf.register_interval) {
|
|
send_register(eee, &(eee->curr_sn->sock), mac, N2N_FORWARDED_REG_COOKIE);
|
|
send_query_peer(eee, scan->mac_addr);
|
|
scan->last_sent_query = now;
|
|
return(0);
|
|
}
|
|
|
|
return(1);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/* @return 1 if destination is a peer, 0 if destination is supernode */
|
|
static int find_peer_destination (n2n_edge_t * eee,
|
|
n2n_mac_t mac_address,
|
|
n2n_sock_t * destination) {
|
|
|
|
struct peer_info *scan;
|
|
macstr_t mac_buf;
|
|
n2n_sock_str_t sockbuf;
|
|
int retval = 0;
|
|
time_t now = time(NULL);
|
|
|
|
if(is_multi_broadcast(mac_address)) {
|
|
traceEvent(TRACE_DEBUG, "multicast or broadcast destination peer, using supernode");
|
|
memcpy(destination, &(eee->curr_sn->sock), sizeof(struct sockaddr_in));
|
|
return(0);
|
|
}
|
|
|
|
traceEvent(TRACE_DEBUG, "searching destination socket for %s",
|
|
macaddr_str(mac_buf, mac_address));
|
|
|
|
HASH_FIND_PEER(eee->known_peers, mac_address, scan);
|
|
|
|
if(scan && (scan->last_seen > 0)) {
|
|
if((now - scan->last_p2p) >= (scan->timeout / 2)) {
|
|
/* Too much time passed since we saw the peer, need to register again
|
|
* since the peer address may have changed. */
|
|
traceEvent(TRACE_DEBUG, "refreshing idle known peer");
|
|
HASH_DEL(eee->known_peers, scan);
|
|
mgmt_event_post(N2N_EVENT_PEER,N2N_EVENT_PEER_DEL_P2P,scan);
|
|
free(scan);
|
|
/* NOTE: registration will be performed upon the receival of the next response packet */
|
|
} else {
|
|
/* Valid known peer found */
|
|
memcpy(destination, &scan->sock, sizeof(n2n_sock_t));
|
|
retval = 1;
|
|
}
|
|
}
|
|
|
|
if(retval == 0) {
|
|
memcpy(destination, &(eee->curr_sn->sock), sizeof(struct sockaddr_in));
|
|
traceEvent(TRACE_DEBUG, "p2p peer %s not found, using supernode",
|
|
macaddr_str(mac_buf, mac_address));
|
|
|
|
check_query_peer_info(eee, now, mac_address);
|
|
}
|
|
|
|
traceEvent(TRACE_DEBUG, "found peer's socket %s [%s]",
|
|
macaddr_str(mac_buf, mac_address),
|
|
sock_to_cstr(sockbuf, destination));
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* ***************************************************** */
|
|
|
|
/** Send an ecapsulated ethernet PACKET to a destination edge or broadcast MAC
|
|
* address. */
|
|
static int send_packet (n2n_edge_t * eee,
|
|
n2n_mac_t dstMac,
|
|
const uint8_t * pktbuf,
|
|
size_t pktlen) {
|
|
|
|
int is_p2p;
|
|
/*ssize_t s; */
|
|
n2n_sock_str_t sockbuf;
|
|
n2n_sock_t destination;
|
|
macstr_t mac_buf;
|
|
struct peer_info *peer, *tmp_peer;
|
|
|
|
/* hexdump(pktbuf, pktlen); */
|
|
|
|
is_p2p = find_peer_destination(eee, dstMac, &destination);
|
|
|
|
traceEvent(TRACE_INFO, "Tx PACKET of %u bytes to %s [%s]",
|
|
pktlen, macaddr_str(mac_buf, dstMac),
|
|
sock_to_cstr(sockbuf, &destination));
|
|
|
|
if(is_p2p)
|
|
++(eee->stats.tx_p2p);
|
|
else
|
|
++(eee->stats.tx_sup);
|
|
|
|
if(is_multi_broadcast(dstMac)) {
|
|
++(eee->stats.tx_sup_broadcast);
|
|
|
|
// if no supernode around, foward the broadcast to all known peers
|
|
if(eee->sn_wait) {
|
|
HASH_ITER(hh, eee->known_peers, peer, tmp_peer)
|
|
sendto_sock(eee, pktbuf, pktlen, &peer->sock);
|
|
return 0;
|
|
}
|
|
// fall through otherwise
|
|
}
|
|
|
|
sendto_sock(eee, pktbuf, pktlen, &destination);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** A layer-2 packet was received at the tunnel and needs to be sent via UDP. */
|
|
void edge_send_packet2net (n2n_edge_t * eee,
|
|
uint8_t *tap_pkt, size_t len) {
|
|
|
|
ipstr_t ip_buf;
|
|
n2n_mac_t destMac;
|
|
n2n_common_t cmn;
|
|
n2n_PACKET_t pkt;
|
|
uint8_t *enc_src = tap_pkt;
|
|
size_t enc_len = len;
|
|
uint8_t compression_buf[N2N_PKT_BUF_SIZE];
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE];
|
|
size_t idx = 0;
|
|
n2n_transform_t tx_transop_idx = eee->transop.transform_id;
|
|
ether_hdr_t eh;
|
|
|
|
/* tap_pkt is not aligned so we have to copy to aligned memory */
|
|
memcpy(&eh, tap_pkt, sizeof(ether_hdr_t));
|
|
|
|
/* Discard IP packets that are not originated by this hosts */
|
|
if(!(eee->conf.allow_routing)) {
|
|
if(ntohs(eh.type) == 0x0800) {
|
|
/* This is an IP packet from the local source address - not forwarded. */
|
|
uint32_t *src = (uint32_t*)&tap_pkt[ETH_FRAMESIZE + IP4_SRCOFFSET];
|
|
|
|
/* Note: all elements of the_ip are in network order */
|
|
if(*src != eee->device.ip_addr) {
|
|
/* This is a packet that needs to be routed */
|
|
traceEvent(TRACE_INFO, "discarding routed packet destined to [%s]",
|
|
intoa(ntohl(*src), ip_buf, sizeof(ip_buf)));
|
|
return;
|
|
} else {
|
|
/* This packet is originated by us */
|
|
/* traceEvent(TRACE_INFO, "Sending non-routed packet"); */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Optionally compress then apply transforms, eg encryption. */
|
|
|
|
/* Once processed, send to destination in PACKET */
|
|
|
|
memcpy(destMac, tap_pkt, N2N_MAC_SIZE); /* dest MAC is first in ethernet header */
|
|
#ifdef HAVE_BRIDGING_SUPPORT
|
|
/* find the destMac behind which edge, and change dest to this edge */
|
|
if((eee->conf.allow_routing) && (!is_multi_broadcast(destMac))) {
|
|
struct host_info *host = NULL;
|
|
HASH_FIND(hh, eee->known_hosts, destMac, sizeof(n2n_mac_t), host);
|
|
if(host) {
|
|
memcpy(destMac, host->edge_addr, N2N_MAC_SIZE);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
memset(&cmn, 0, sizeof(cmn));
|
|
cmn.ttl = N2N_DEFAULT_TTL;
|
|
cmn.pc = n2n_packet;
|
|
cmn.flags = 0; /* no options, not from supernode, no socket */
|
|
memcpy(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE);
|
|
|
|
memset(&pkt, 0, sizeof(pkt));
|
|
memcpy(pkt.srcMac, eee->device.mac_addr, N2N_MAC_SIZE);
|
|
memcpy(pkt.dstMac, destMac, N2N_MAC_SIZE);
|
|
|
|
pkt.transform = tx_transop_idx;
|
|
|
|
// compression needs to be tried before encode_PACKET is called for compression indication gets encoded there
|
|
pkt.compression = N2N_COMPRESSION_ID_NONE;
|
|
|
|
if(eee->conf.compression) {
|
|
int32_t compression_len;
|
|
|
|
switch(eee->conf.compression) {
|
|
case N2N_COMPRESSION_ID_LZO:
|
|
compression_len = eee->transop_lzo.fwd(&eee->transop_lzo,
|
|
compression_buf, sizeof(compression_buf),
|
|
tap_pkt, len,
|
|
pkt.dstMac);
|
|
|
|
if((compression_len > 0) && (compression_len < len)) {
|
|
pkt.compression = N2N_COMPRESSION_ID_LZO;
|
|
}
|
|
break;
|
|
|
|
#ifdef HAVE_ZSTD
|
|
case N2N_COMPRESSION_ID_ZSTD:
|
|
compression_len = eee->transop_zstd.fwd(&eee->transop_zstd,
|
|
compression_buf, sizeof(compression_buf),
|
|
tap_pkt, len,
|
|
pkt.dstMac);
|
|
|
|
if((compression_len > 0) && (compression_len < len)) {
|
|
pkt.compression = N2N_COMPRESSION_ID_ZSTD;
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if(pkt.compression != N2N_COMPRESSION_ID_NONE) {
|
|
traceEvent(TRACE_DEBUG, "payload compression [%s]: compressed %u bytes to %u bytes\n",
|
|
compression_str(pkt.compression), len, compression_len);
|
|
enc_src = compression_buf;
|
|
enc_len = compression_len;
|
|
}
|
|
}
|
|
|
|
idx = 0;
|
|
encode_PACKET(pktbuf, &idx, &cmn, &pkt);
|
|
|
|
uint16_t headerIdx = idx;
|
|
|
|
idx += eee->transop.fwd(&eee->transop,
|
|
pktbuf + idx, N2N_PKT_BUF_SIZE - idx,
|
|
enc_src, enc_len, pkt.dstMac);
|
|
|
|
traceEvent(TRACE_DEBUG, "encode PACKET of %u bytes, %u bytes data, %u bytes overhead, transform %u",
|
|
(u_int)idx, (u_int)len, (u_int)(idx - len), tx_transop_idx);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED)
|
|
// in case of user-password auth, also encrypt the iv of payload assuming ChaCha20 and SPECK having the same iv size
|
|
packet_header_encrypt(pktbuf, headerIdx + (NULL != eee->conf.shared_secret) * min(idx - headerIdx, N2N_SPECK_IVEC_SIZE), idx,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
time_stamp());
|
|
|
|
#ifdef MTU_ASSERT_VALUE
|
|
{
|
|
const u_int eth_udp_overhead = ETH_FRAMESIZE + IP4_MIN_SIZE + UDP_SIZE;
|
|
|
|
// MTU assertion which avoids fragmentation by N2N
|
|
assert(idx + eth_udp_overhead <= MTU_ASSERT_VALUE);
|
|
}
|
|
#endif
|
|
|
|
eee->transop.tx_cnt++; /* stats */
|
|
|
|
send_packet(eee, destMac, pktbuf, idx); /* to peer or supernode */
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Read a single packet from the TAP interface, process it and write out the
|
|
* corresponding packet to the cooked socket.
|
|
*/
|
|
void edge_read_from_tap (n2n_edge_t * eee) {
|
|
|
|
/* tun -> remote */
|
|
uint8_t eth_pkt[N2N_PKT_BUF_SIZE];
|
|
macstr_t mac_buf;
|
|
ssize_t len;
|
|
|
|
len = tuntap_read( &(eee->device), eth_pkt, N2N_PKT_BUF_SIZE );
|
|
if((len <= 0) || (len > N2N_PKT_BUF_SIZE)) {
|
|
traceEvent(TRACE_WARNING, "read()=%d [%d/%s]",
|
|
(signed int)len, errno, strerror(errno));
|
|
traceEvent(TRACE_WARNING, "TAP I/O operation aborted, restart later.");
|
|
sleep(3);
|
|
tuntap_close(&(eee->device));
|
|
tuntap_open(&(eee->device), eee->tuntap_priv_conf.tuntap_dev_name, eee->tuntap_priv_conf.ip_mode, eee->tuntap_priv_conf.ip_addr,
|
|
eee->tuntap_priv_conf.netmask, eee->tuntap_priv_conf.device_mac, eee->tuntap_priv_conf.mtu
|
|
#ifdef _WIN32
|
|
,eee->tuntap_priv_conf.metric
|
|
#endif
|
|
);
|
|
} else {
|
|
const uint8_t * mac = eth_pkt;
|
|
traceEvent(TRACE_DEBUG, "Rx TAP packet (%4d) for %s",
|
|
(signed int)len, macaddr_str(mac_buf, mac));
|
|
|
|
if(eee->conf.drop_multicast &&
|
|
(is_ip6_discovery(eth_pkt, len) ||
|
|
is_ethMulticast(eth_pkt, len))) {
|
|
traceEvent(TRACE_INFO, "dropping Tx multicast");
|
|
} else {
|
|
if(!eee->last_sup) {
|
|
// drop packets before first registration with supernode
|
|
traceEvent(TRACE_DEBUG, "DROP packet before first registration with supernode");
|
|
return;
|
|
}
|
|
|
|
if(eee->network_traffic_filter) {
|
|
if(eee->network_traffic_filter->filter_packet_from_tap(eee->network_traffic_filter, eee, eth_pkt,
|
|
len) == N2N_DROP) {
|
|
traceEvent(TRACE_DEBUG, "filtered packet of size %u", (unsigned int)len);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(eee->cb.packet_from_tap) {
|
|
uint16_t tmp_len = len;
|
|
if(eee->cb.packet_from_tap(eee, eth_pkt, &tmp_len) == N2N_DROP) {
|
|
traceEvent(TRACE_DEBUG, "DROP packet of size %u", (unsigned int)len);
|
|
return;
|
|
}
|
|
len = tmp_len;
|
|
}
|
|
|
|
edge_send_packet2net(eee, eth_pkt, len);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
/** handle a datagram from the main UDP socket to the internet. */
|
|
void process_udp (n2n_edge_t *eee, const struct sockaddr *sender_sock, const SOCKET in_sock,
|
|
uint8_t *udp_buf, size_t udp_size, time_t now) {
|
|
|
|
n2n_common_t cmn; /* common fields in the packet header */
|
|
n2n_sock_str_t sockbuf1;
|
|
n2n_sock_str_t sockbuf2; /* don't clobber sockbuf1 if writing two addresses to trace */
|
|
macstr_t mac_buf1;
|
|
macstr_t mac_buf2;
|
|
uint8_t hash_buf[16];
|
|
size_t rem;
|
|
size_t idx;
|
|
size_t msg_type;
|
|
uint8_t from_supernode;
|
|
uint8_t via_multicast;
|
|
peer_info_t *sn = NULL;
|
|
n2n_sock_t sender;
|
|
n2n_sock_t * orig_sender = NULL;
|
|
uint32_t header_enc = 0;
|
|
uint64_t stamp = 0;
|
|
int skip_add = 0;
|
|
|
|
/* REVISIT: when UDP/IPv6 is supported we will need a flag to indicate which
|
|
* IP transport version the packet arrived on. May need to UDP sockets. */
|
|
|
|
memset(&sender, 0, sizeof(n2n_sock_t));
|
|
|
|
if(eee->conf.connect_tcp)
|
|
// TCP expects that we know our comm partner and does not deliver the sender
|
|
memcpy(&sender, &(eee->curr_sn->sock), sizeof(struct sockaddr_in));
|
|
else {
|
|
// REVISIT: type conversion back and forth, choose a consistent approach throughout whole code,
|
|
// i.e. stick with more general sockaddr as long as possible and narrow only if required
|
|
fill_n2nsock(&sender, sender_sock);
|
|
}
|
|
/* The packet may not have an orig_sender socket spec. So default to last
|
|
* hop as sender. */
|
|
orig_sender = &sender;
|
|
|
|
#ifdef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
via_multicast = 0;
|
|
#else
|
|
via_multicast = (in_sock == eee->udp_multicast_sock);
|
|
#endif
|
|
|
|
traceEvent(TRACE_DEBUG, "Rx N2N_UDP of size %d from [%s]",
|
|
(signed int)udp_size, sock_to_cstr(sockbuf1, &sender));
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
// match with static (1) or dynamic (2) ctx?
|
|
// check dynamic first as it is identical to static in normal header encryption mode
|
|
if(packet_header_decrypt(udp_buf, udp_size,
|
|
(char *)eee->conf.community_name,
|
|
eee->conf.header_encryption_ctx_dynamic, eee->conf.header_iv_ctx_dynamic,
|
|
&stamp)) {
|
|
header_enc = 2; /* not accurate with normal header encryption but does not matter */
|
|
}
|
|
if(!header_enc) {
|
|
// check static now (very likely to be REGISTER_SUPER_ACK, REGISTER_SUPER_NAK or invalid)
|
|
if(eee->conf.shared_secret) {
|
|
// hash the still encrypted packet to eventually be able to check it later (required for REGISTER_SUPER_ACK with user/pw auth)
|
|
pearson_hash_128(hash_buf, udp_buf, max(0, (int)udp_size - (int)N2N_REG_SUP_HASH_CHECK_LEN));
|
|
}
|
|
header_enc = packet_header_decrypt(udp_buf, max(0, (int)udp_size - (int)N2N_REG_SUP_HASH_CHECK_LEN),
|
|
(char *)eee->conf.community_name,
|
|
eee->conf.header_encryption_ctx_static, eee->conf.header_iv_ctx_static,
|
|
&stamp);
|
|
}
|
|
if(!header_enc) {
|
|
traceEvent(TRACE_DEBUG, "failed to decrypt header");
|
|
return;
|
|
}
|
|
// time stamp verification follows in the packet specific section as it requires to determine the
|
|
// sender from the hash list by its MAC, or the packet might be from the supernode, this all depends
|
|
// on packet type, path taken (via supernode) and packet structure (MAC is not always in the same place)
|
|
}
|
|
|
|
rem = udp_size; /* Counts down bytes of packet to protect against buffer overruns. */
|
|
idx = 0; /* marches through packet header as parts are decoded. */
|
|
if(decode_common(&cmn, udp_buf, &rem, &idx) < 0) {
|
|
if(via_multicast) {
|
|
// from some other edge on local network, possibly header encrypted
|
|
traceEvent(TRACE_DEBUG, "dropped packet arriving via multicast due to error while decoding N2N_UDP");
|
|
} else {
|
|
traceEvent(TRACE_INFO, "failed to decode common section in N2N_UDP");
|
|
}
|
|
return; /* failed to decode packet */
|
|
}
|
|
|
|
msg_type = cmn.pc; /* packet code */
|
|
|
|
// special case for user/pw auth
|
|
// community's auth scheme and message type need to match the used key (dynamic)
|
|
if((eee->conf.shared_secret)
|
|
&& (msg_type != MSG_TYPE_REGISTER_SUPER_ACK)
|
|
&& (msg_type != MSG_TYPE_REGISTER_SUPER_NAK)) {
|
|
if(header_enc != 2) {
|
|
traceEvent(TRACE_INFO, "dropped packet encrypted with static key where dynamic key expected");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// check if packet is from supernode and find the corresponding supernode in list
|
|
from_supernode = cmn.flags & N2N_FLAGS_FROM_SUPERNODE;
|
|
if(from_supernode) {
|
|
skip_add = SN_ADD_SKIP;
|
|
sn = add_sn_to_list_by_mac_or_sock(&(eee->conf.supernodes), &sender, null_mac, &skip_add);
|
|
if(!sn) {
|
|
traceEvent(TRACE_DEBUG, "dropped incoming data from unknown supernode");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(0 == memcmp(cmn.community, eee->conf.community_name, N2N_COMMUNITY_SIZE)) {
|
|
switch(msg_type) {
|
|
case MSG_TYPE_PACKET: {
|
|
/* process PACKET - most frequent so first in list. */
|
|
n2n_PACKET_t pkt;
|
|
|
|
decode_PACKET(&pkt, &cmn, udp_buf, &rem, &idx);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, pkt.srcMac, stamp, TIME_STAMP_ALLOW_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped PACKET due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(!eee->last_sup) {
|
|
// drop packets received before first registration with supernode
|
|
traceEvent(TRACE_DEBUG, "dropped PACKET recevied before first registration with supernode");
|
|
return;
|
|
}
|
|
|
|
if(!from_supernode) {
|
|
/* This is a P2P packet from the peer. We purge a pending
|
|
* registration towards the possibly nat-ted peer address as we now have
|
|
* a valid channel. We still use check_peer_registration_needed in
|
|
* handle_PACKET to double check this.
|
|
*/
|
|
traceEvent(TRACE_DEBUG, "[p2p] from %s",
|
|
macaddr_str(mac_buf1, pkt.srcMac));
|
|
find_and_remove_peer(&eee->pending_peers, pkt.srcMac);
|
|
} else {
|
|
/* [PsP] : edge Peer->Supernode->edge Peer */
|
|
|
|
if(is_valid_peer_sock(&pkt.sock))
|
|
orig_sender = &(pkt.sock);
|
|
|
|
traceEvent(TRACE_DEBUG, "[pSp] from %s via [%s]",
|
|
macaddr_str(mac_buf1, pkt.srcMac),
|
|
sock_to_cstr(sockbuf1, &sender));
|
|
}
|
|
|
|
/* Update the sender in peer table entry */
|
|
check_peer_registration_needed(eee, from_supernode, via_multicast,
|
|
pkt.srcMac,
|
|
// REVISIT: also consider PORT_REG_COOKIEs when implemented
|
|
from_supernode ? N2N_FORWARDED_REG_COOKIE : N2N_REGULAR_REG_COOKIE,
|
|
NULL, NULL, orig_sender);
|
|
|
|
handle_PACKET(eee, from_supernode, &pkt, orig_sender, udp_buf + idx, udp_size - idx);
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_REGISTER: {
|
|
/* Another edge is registering with us */
|
|
n2n_REGISTER_t reg;
|
|
|
|
decode_REGISTER(®, &cmn, udp_buf, &rem, &idx);
|
|
|
|
via_multicast &= is_null_mac(reg.dstMac);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, reg.srcMac, stamp,
|
|
via_multicast ? TIME_STAMP_ALLOW_JITTER : TIME_STAMP_NO_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped REGISTER due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(is_valid_peer_sock(®.sock))
|
|
orig_sender = &(reg.sock);
|
|
|
|
if(via_multicast && !memcmp(reg.srcMac, eee->device.mac_addr, N2N_MAC_SIZE)) {
|
|
traceEvent(TRACE_DEBUG, "skipping REGISTER from self");
|
|
break;
|
|
}
|
|
|
|
if(!via_multicast && memcmp(reg.dstMac, eee->device.mac_addr, N2N_MAC_SIZE)) {
|
|
traceEvent(TRACE_DEBUG, "skipping REGISTER for other peer");
|
|
break;
|
|
}
|
|
|
|
if(!from_supernode) {
|
|
/* This is a P2P registration from the peer. We purge a pending
|
|
* registration towards the possibly nat-ted peer address as we now have
|
|
* a valid channel. We still use check_peer_registration_needed below
|
|
* to double check this.
|
|
*/
|
|
traceEvent(TRACE_INFO, "[p2p] Rx REGISTER from %s [%s]%s",
|
|
macaddr_str(mac_buf1, reg.srcMac),
|
|
sock_to_cstr(sockbuf1, &sender),
|
|
(reg.cookie & N2N_LOCAL_REG_COOKIE) ? " (local)" : "");
|
|
find_and_remove_peer(&eee->pending_peers, reg.srcMac);
|
|
|
|
/* NOTE: only ACK to peers */
|
|
send_register_ack(eee, orig_sender, ®);
|
|
} else {
|
|
traceEvent(TRACE_INFO, "[pSp] Rx REGISTER from %s [%s] to %s via [%s]",
|
|
macaddr_str(mac_buf1, reg.srcMac), sock_to_cstr(sockbuf2, orig_sender),
|
|
macaddr_str(mac_buf2, reg.dstMac), sock_to_cstr(sockbuf1, &sender));
|
|
}
|
|
|
|
check_peer_registration_needed(eee, from_supernode, via_multicast,
|
|
reg.srcMac, reg.cookie, ®.dev_addr, (const n2n_desc_t*)®.dev_desc, orig_sender);
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_REGISTER_ACK: {
|
|
/* Peer edge is acknowledging our register request */
|
|
n2n_REGISTER_ACK_t ra;
|
|
|
|
decode_REGISTER_ACK(&ra, &cmn, udp_buf, &rem, &idx);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, ra.srcMac, stamp, TIME_STAMP_NO_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped REGISTER_ACK due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(is_valid_peer_sock(&ra.sock))
|
|
orig_sender = &(ra.sock);
|
|
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_ACK from %s [%s] to %s via [%s]%s",
|
|
macaddr_str(mac_buf1, ra.srcMac),
|
|
sock_to_cstr(sockbuf2, orig_sender),
|
|
macaddr_str(mac_buf2, ra.dstMac),
|
|
sock_to_cstr(sockbuf1, &sender),
|
|
(ra.cookie & N2N_LOCAL_REG_COOKIE) ? " (local)" : "");
|
|
|
|
peer_set_p2p_confirmed(eee, ra.srcMac,
|
|
ra.cookie,
|
|
&sender, now);
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_REGISTER_SUPER_ACK: {
|
|
in_addr_t net;
|
|
char * ip_str = NULL;
|
|
n2n_REGISTER_SUPER_ACK_t ra;
|
|
uint8_t tmpbuf[REG_SUPER_ACK_PAYLOAD_SPACE];
|
|
char ip_tmp[N2N_EDGE_SN_HOST_SIZE];
|
|
n2n_REGISTER_SUPER_ACK_payload_t *payload;
|
|
n2n_sock_t payload_sock;
|
|
int i;
|
|
int skip_add;
|
|
|
|
if(!(eee->sn_wait)) {
|
|
traceEvent(TRACE_DEBUG, "Rx REGISTER_SUPER_ACK with no outstanding REGISTER_SUPER");
|
|
return;
|
|
}
|
|
|
|
memset(&ra, 0, sizeof(n2n_REGISTER_SUPER_ACK_t));
|
|
decode_REGISTER_SUPER_ACK(&ra, &cmn, udp_buf, &rem, &idx, tmpbuf);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, ra.srcMac, stamp, TIME_STAMP_NO_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped REGISTER_SUPER_ACK due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// hash check (user/pw auth only)
|
|
if(eee->conf.shared_secret) {
|
|
speck_128_encrypt(hash_buf, (speck_context_t*)eee->conf.shared_secret_ctx);
|
|
if(memcmp(hash_buf, udp_buf + udp_size - N2N_REG_SUP_HASH_CHECK_LEN /* length is has already been checked */, N2N_REG_SUP_HASH_CHECK_LEN)) {
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_SUPER_ACK with wrong hash");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(ra.cookie != eee->curr_sn->last_cookie) {
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_SUPER_ACK with wrong or old cookie");
|
|
return;
|
|
}
|
|
|
|
if(handle_remote_auth(eee, sn, &(ra.auth))) {
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_SUPER_ACK with wrong or old response to challenge");
|
|
if(eee->conf.shared_secret) {
|
|
traceEvent(TRACE_NORMAL, "Rx REGISTER_SUPER_ACK with wrong or old response to challenge, maybe indicating wrong federation public key (-P)");
|
|
}
|
|
return;
|
|
}
|
|
|
|
if(is_valid_peer_sock(&ra.sock))
|
|
orig_sender = &(ra.sock);
|
|
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_SUPER_ACK from %s [%s] (external %s) with %u attempts left",
|
|
macaddr_str(mac_buf1, ra.srcMac),
|
|
sock_to_cstr(sockbuf1, &sender),
|
|
sock_to_cstr(sockbuf2, orig_sender),
|
|
(unsigned int)eee->sup_attempts);
|
|
|
|
if(is_null_mac(eee->curr_sn->mac_addr)) {
|
|
HASH_DEL(eee->conf.supernodes, eee->curr_sn);
|
|
memcpy(&eee->curr_sn->mac_addr, ra.srcMac, N2N_MAC_SIZE);
|
|
HASH_ADD_PEER(eee->conf.supernodes, eee->curr_sn);
|
|
}
|
|
|
|
payload = (n2n_REGISTER_SUPER_ACK_payload_t*)tmpbuf;
|
|
|
|
// from here on, 'sn' gets used differently
|
|
for(i = 0; i < ra.num_sn; i++) {
|
|
skip_add = SN_ADD;
|
|
|
|
// bugfix for https://github.com/ntop/n2n/issues/1029
|
|
// REVISIT: best to be removed with 4.0
|
|
idx = 0;
|
|
rem = sizeof(payload->sock);
|
|
decode_sock_payload(&payload_sock, payload->sock, &rem, &idx);
|
|
|
|
sn = add_sn_to_list_by_mac_or_sock(&(eee->conf.supernodes), &payload_sock, payload->mac, &skip_add);
|
|
|
|
if(skip_add == SN_ADD_ADDED) {
|
|
sn->ip_addr = calloc(1, N2N_EDGE_SN_HOST_SIZE);
|
|
if(sn->ip_addr != NULL) {
|
|
inet_ntop(payload_sock.family,
|
|
(payload_sock.family == AF_INET) ? (void*)&(payload_sock.addr.v4) : (void*)&(payload_sock.addr.v6),
|
|
sn->ip_addr, N2N_EDGE_SN_HOST_SIZE - 1);
|
|
sprintf(ip_tmp, "%s:%u", (char*)sn->ip_addr, (uint16_t)(payload_sock.port));
|
|
memcpy(sn->ip_addr, ip_tmp, sizeof(ip_tmp));
|
|
}
|
|
sn_selection_criterion_default(&(sn->selection_criterion));
|
|
sn->last_seen = 0; /* as opposed to payload handling in supernode */
|
|
traceEvent(TRACE_NORMAL, "supernode '%s' added to the list of supernodes.", sn->ip_addr);
|
|
}
|
|
// shift to next payload entry
|
|
payload++;
|
|
}
|
|
|
|
if(eee->conf.tuntap_ip_mode == TUNTAP_IP_MODE_SN_ASSIGN) {
|
|
if((ra.dev_addr.net_addr != 0) && (ra.dev_addr.net_bitlen != 0)) {
|
|
net = htonl(ra.dev_addr.net_addr);
|
|
if((ip_str = inet_ntoa(*(struct in_addr *) &net)) != NULL) {
|
|
strncpy(eee->tuntap_priv_conf.ip_addr, ip_str, N2N_NETMASK_STR_SIZE);
|
|
eee->tuntap_priv_conf.ip_addr[N2N_NETMASK_STR_SIZE - 1] = '\0';
|
|
}
|
|
net = htonl(bitlen2mask(ra.dev_addr.net_bitlen));
|
|
if((ip_str = inet_ntoa(*(struct in_addr *) &net)) != NULL) {
|
|
strncpy(eee->tuntap_priv_conf.netmask, ip_str, N2N_NETMASK_STR_SIZE);
|
|
eee->tuntap_priv_conf.netmask[N2N_NETMASK_STR_SIZE - 1] = '\0';
|
|
}
|
|
}
|
|
}
|
|
|
|
eee->sn_wait = 0;
|
|
reset_sup_attempts(eee); /* refresh because we got a response */
|
|
|
|
// update last_sup only on 'real' REGISTER_SUPER_ACKs, not on bootstrap ones (own MAC address
|
|
// still null_mac) this allows reliable in/out PACKET drop if not really registered with a supernode yet
|
|
if(!is_null_mac(eee->device.mac_addr)) {
|
|
if(!eee->last_sup) {
|
|
// indicates first successful connection between the edge and a supernode
|
|
traceEvent(TRACE_NORMAL, "[OK] edge <<< ================ >>> supernode");
|
|
// send gratuitous ARP only upon first registration with supernode
|
|
send_grat_arps(eee);
|
|
}
|
|
eee->last_sup = now;
|
|
}
|
|
|
|
// NOTE: the register_interval should be chosen by the edge node based on its NAT configuration.
|
|
// eee->conf.register_interval = ra.lifetime;
|
|
|
|
if(eee->cb.sn_registration_updated && !is_null_mac(eee->device.mac_addr))
|
|
eee->cb.sn_registration_updated(eee, now, &sender);
|
|
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_REGISTER_SUPER_NAK: {
|
|
|
|
n2n_REGISTER_SUPER_NAK_t nak;
|
|
|
|
if(!(eee->sn_wait)) {
|
|
traceEvent(TRACE_DEBUG, "Rx REGISTER_SUPER_NAK with no outstanding REGISTER_SUPER");
|
|
return;
|
|
}
|
|
|
|
memset(&nak, 0, sizeof(n2n_REGISTER_SUPER_NAK_t));
|
|
decode_REGISTER_SUPER_NAK(&nak, &cmn, udp_buf, &rem, &idx);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, nak.srcMac, stamp, TIME_STAMP_NO_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped REGISTER_SUPER_NAK due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if(nak.cookie != eee->curr_sn->last_cookie) {
|
|
traceEvent(TRACE_DEBUG, "Rx REGISTER_SUPER_NAK with wrong or old cookie");
|
|
return;
|
|
}
|
|
|
|
// REVISIT: authenticate the NAK packet really originating from the supernode along the auth token.
|
|
// this must follow a different scheme because it needs to prove authenticity although the
|
|
// edge-provided credentials are wrong
|
|
|
|
traceEvent(TRACE_INFO, "Rx REGISTER_SUPER_NAK");
|
|
|
|
if((memcmp(nak.srcMac, eee->device.mac_addr, sizeof(n2n_mac_t))) == 0) {
|
|
if(eee->conf.shared_secret) {
|
|
traceEvent(TRACE_ERROR, "authentication error, username or password not recognized by supernode");
|
|
} else {
|
|
traceEvent(TRACE_ERROR, "authentication error, MAC or IP address already in use or not released yet by supernode");
|
|
}
|
|
// REVISIT: the following portion is too harsh, repeated error warning should be sufficient until it eventually is resolved,
|
|
// preventing de-auth attacks
|
|
/* exit(1); this is too harsh, repeated error warning should be sufficient until it eventually is resolved, preventing de-auth attacks
|
|
} else {
|
|
HASH_FIND_PEER(eee->known_peers, nak.srcMac, peer);
|
|
if(peer != NULL) {
|
|
HASH_DEL(eee->known_peers, peer);
|
|
}
|
|
HASH_FIND_PEER(eee->pending_peers, nak.srcMac, scan);
|
|
if(scan != NULL) {
|
|
HASH_DEL(eee->pending_peers, scan);
|
|
} */
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_PEER_INFO: {
|
|
|
|
n2n_PEER_INFO_t pi;
|
|
struct peer_info * scan;
|
|
int skip_add;
|
|
|
|
decode_PEER_INFO(&pi, &cmn, udp_buf, &rem, &idx);
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, null_mac, stamp, TIME_STAMP_ALLOW_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped PEER_INFO due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if((cmn.flags & N2N_FLAGS_SOCKET) && !is_valid_peer_sock(&pi.sock)) {
|
|
traceEvent(TRACE_DEBUG, "skip invalid PEER_INFO from %s [%s]",
|
|
macaddr_str(mac_buf1, pi.mac),
|
|
sock_to_cstr(sockbuf1, &pi.sock));
|
|
break;
|
|
}
|
|
|
|
if(is_null_mac(pi.mac)) {
|
|
// PONG - answer to PING (QUERY_PEER_INFO with null mac)
|
|
skip_add = SN_ADD_SKIP;
|
|
scan = add_sn_to_list_by_mac_or_sock(&(eee->conf.supernodes), &sender, pi.srcMac, &skip_add);
|
|
if(scan != NULL) {
|
|
eee->sn_pong = 1;
|
|
scan->last_seen = now;
|
|
scan->uptime = pi.uptime;
|
|
memcpy(scan->version, pi.version, sizeof(n2n_version_t));
|
|
/* The data type depends on the actual selection strategy that has been chosen. */
|
|
SN_SELECTION_CRITERION_DATA_TYPE sn_sel_tmp = pi.load;
|
|
sn_selection_criterion_calculate(eee, scan, &sn_sel_tmp);
|
|
|
|
traceEvent(TRACE_INFO, "Rx PONG from supernode %s version '%s'",
|
|
macaddr_str(mac_buf1, pi.srcMac),
|
|
pi.version);
|
|
|
|
break;
|
|
}
|
|
} else {
|
|
// regular PEER_INFO
|
|
HASH_FIND_PEER(eee->pending_peers, pi.mac, scan);
|
|
if(!scan)
|
|
// just in case the remote edge has been upgraded by the REG/ACK mechanism in the meantime
|
|
HASH_FIND_PEER(eee->known_peers, pi.mac, scan);
|
|
|
|
if(scan) {
|
|
scan->sock = pi.sock;
|
|
|
|
traceEvent(TRACE_INFO, "Rx PEER_INFO %s can be found at [%s]",
|
|
macaddr_str(mac_buf1, pi.mac),
|
|
sock_to_cstr(sockbuf1, &pi.sock));
|
|
|
|
if(cmn.flags & N2N_FLAGS_SOCKET) {
|
|
scan->preferred_sock = pi.preferred_sock;
|
|
send_register(eee, &scan->preferred_sock, scan->mac_addr, N2N_LOCAL_REG_COOKIE);
|
|
|
|
traceEvent(TRACE_INFO, "%s has preferred local socket at [%s]",
|
|
macaddr_str(mac_buf1, pi.mac),
|
|
sock_to_cstr(sockbuf1, &pi.preferred_sock));
|
|
}
|
|
|
|
send_register(eee, &scan->sock, scan->mac_addr, N2N_REGULAR_REG_COOKIE);
|
|
|
|
} else {
|
|
traceEvent(TRACE_INFO, "Rx PEER_INFO unknown peer %s",
|
|
macaddr_str(mac_buf1, pi.mac));
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MSG_TYPE_RE_REGISTER_SUPER: {
|
|
|
|
if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) {
|
|
if(!find_peer_time_stamp_and_verify(eee, sn, null_mac, stamp, TIME_STAMP_NO_JITTER)) {
|
|
traceEvent(TRACE_DEBUG, "dropped RE_REGISTER due to time stamp error");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// only accept in user/pw mode for immediate re-registration because the new
|
|
// key is required for continous traffic flow, in other modes edge will realize
|
|
// changes with regular recurring REGISTER_SUPER
|
|
if(!eee->conf.shared_secret) {
|
|
traceEvent(TRACE_DEBUG, "dropped RE_REGISTER_SUPER as not in user/pw auth mode");
|
|
return;
|
|
}
|
|
|
|
traceEvent(TRACE_INFO, "Rx RE_REGISTER_SUPER");
|
|
|
|
eee->sn_wait = 2; /* immediately */
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
/* Not a known message type */
|
|
traceEvent(TRACE_INFO, "unable to handle packet type %d: ignored", (signed int)msg_type);
|
|
return;
|
|
} /* switch(msg_type) */
|
|
} else if(from_supernode) /* if(community match) */
|
|
traceEvent(TRACE_INFO, "received packet with unknown community");
|
|
else
|
|
traceEvent(TRACE_INFO, "ignoring packet with unknown community");
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
int fetch_and_eventually_process_data (n2n_edge_t *eee, SOCKET sock,
|
|
uint8_t *pktbuf, uint16_t *expected, uint16_t *position,
|
|
time_t now) {
|
|
|
|
ssize_t bread = 0;
|
|
|
|
struct sockaddr_storage sas;
|
|
struct sockaddr *sender_sock = (struct sockaddr*)&sas;
|
|
socklen_t ss_size = sizeof(sas);
|
|
|
|
if((!eee->conf.connect_tcp)
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
|| (sock == eee->udp_multicast_sock)
|
|
#endif
|
|
) {
|
|
// udp
|
|
bread = recvfrom(sock, (void *)pktbuf, N2N_PKT_BUF_SIZE, 0 /*flags*/,
|
|
sender_sock, &ss_size);
|
|
|
|
if((bread < 0)
|
|
#ifdef _WIN32
|
|
&& (WSAGetLastError() != WSAECONNRESET)
|
|
#endif
|
|
) {
|
|
/* For UDP bread of zero just means no data (unlike TCP). */
|
|
/* The fd is no good now. Maybe we lost our interface. */
|
|
traceEvent(TRACE_ERROR, "recvfrom() failed %d errno %d (%s)", bread, errno, strerror(errno));
|
|
#ifdef _WIN32
|
|
traceEvent(TRACE_ERROR, "WSAGetLastError(): %u", WSAGetLastError());
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
// we have a datagram to process...
|
|
if(bread > 0) {
|
|
// ...and the datagram has data (not just a header)
|
|
process_udp(eee, sender_sock, sock, pktbuf, bread, now);
|
|
}
|
|
|
|
} else {
|
|
// tcp
|
|
bread = recvfrom(sock,
|
|
(void *)(pktbuf + *position), *expected - *position, 0 /*flags*/,
|
|
sender_sock, &ss_size);
|
|
if((bread <= 0) && (errno)) {
|
|
traceEvent(TRACE_ERROR, "recvfrom() failed %d errno %d (%s)", bread, errno, strerror(errno));
|
|
#ifdef _WIN32
|
|
traceEvent(TRACE_ERROR, "WSAGetLastError(): %u", WSAGetLastError());
|
|
#endif
|
|
supernode_disconnect(eee);
|
|
eee->sn_wait = 1;
|
|
goto tcp_done;
|
|
}
|
|
*position = *position + bread;
|
|
|
|
if(*position == *expected) {
|
|
if(*position == sizeof(uint16_t)) {
|
|
// the prepended length has been read, preparing for the packet
|
|
*expected = *expected + be16toh(*(uint16_t*)(pktbuf));
|
|
if(*expected > N2N_PKT_BUF_SIZE) {
|
|
supernode_disconnect(eee);
|
|
eee->sn_wait = 1;
|
|
traceEvent(TRACE_DEBUG, "too many bytes expected");
|
|
goto tcp_done;
|
|
}
|
|
} else {
|
|
// full packet read, handle it
|
|
process_udp(eee, sender_sock, sock,
|
|
pktbuf + sizeof(uint16_t), *position - sizeof(uint16_t), now);
|
|
// reset, await new prepended length
|
|
*expected = sizeof(uint16_t);
|
|
*position = 0;
|
|
}
|
|
}
|
|
}
|
|
tcp_done:
|
|
;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void print_edge_stats (const n2n_edge_t *eee) {
|
|
|
|
const struct n2n_edge_stats *s = &eee->stats;
|
|
|
|
traceEvent(TRACE_NORMAL, "**********************************");
|
|
traceEvent(TRACE_NORMAL, "Packet stats:");
|
|
traceEvent(TRACE_NORMAL, " TX P2P: %u pkts", s->tx_p2p);
|
|
traceEvent(TRACE_NORMAL, " RX P2P: %u pkts", s->rx_p2p);
|
|
traceEvent(TRACE_NORMAL, " TX Supernode: %u pkts (%u broadcast)", s->tx_sup, s->tx_sup_broadcast);
|
|
traceEvent(TRACE_NORMAL, " RX Supernode: %u pkts (%u broadcast)", s->rx_sup, s->rx_sup_broadcast);
|
|
traceEvent(TRACE_NORMAL, "**********************************");
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
int run_edge_loop (n2n_edge_t *eee) {
|
|
|
|
size_t numPurged;
|
|
time_t lastIfaceCheck = 0;
|
|
time_t lastTransop = 0;
|
|
time_t last_purge_known = 0;
|
|
time_t last_purge_pending = 0;
|
|
#ifdef HAVE_BRIDGING_SUPPORT
|
|
time_t last_purge_host = 0;
|
|
#endif
|
|
|
|
uint16_t expected = sizeof(uint16_t);
|
|
uint16_t position = 0;
|
|
uint8_t pktbuf[N2N_PKT_BUF_SIZE + sizeof(uint16_t)]; /* buffer + prepended buffer length in case of tcp */
|
|
|
|
#ifdef _WIN32
|
|
struct tunread_arg arg;
|
|
arg.eee = eee;
|
|
HANDLE tun_read_thread = startTunReadThread(&arg);
|
|
#endif
|
|
|
|
*eee->keep_running = true;
|
|
update_supernode_reg(eee, time(NULL));
|
|
|
|
/* Main loop
|
|
*
|
|
* select() is used to wait for input on either the TAP fd or the UDP/TCP
|
|
* socket. When input is present the data is read and processed by either
|
|
* readFromIPSocket() or edge_read_from_tap()
|
|
*/
|
|
|
|
while(*eee->keep_running) {
|
|
|
|
int rc, max_sock = 0;
|
|
fd_set socket_mask;
|
|
struct timeval wait_time;
|
|
time_t now;
|
|
|
|
FD_ZERO(&socket_mask);
|
|
|
|
FD_SET(eee->udp_mgmt_sock, &socket_mask);
|
|
max_sock = eee->udp_mgmt_sock;
|
|
|
|
if(eee->sock >= 0) {
|
|
FD_SET(eee->sock, &socket_mask);
|
|
max_sock = max(eee->sock, eee->udp_mgmt_sock);
|
|
}
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if((eee->conf.allow_p2p)
|
|
&& (eee->conf.preferred_sock.family == (uint8_t)AF_INVALID)) {
|
|
FD_SET(eee->udp_multicast_sock, &socket_mask);
|
|
max_sock = max(eee->sock, eee->udp_multicast_sock);
|
|
}
|
|
#endif
|
|
|
|
#ifndef _WIN32
|
|
FD_SET(eee->device.fd, &socket_mask);
|
|
max_sock = max(max_sock, eee->device.fd);
|
|
#endif
|
|
|
|
wait_time.tv_sec = (eee->sn_wait) ? (SOCKET_TIMEOUT_INTERVAL_SECS / 10 + 1) : (SOCKET_TIMEOUT_INTERVAL_SECS);
|
|
wait_time.tv_usec = 0;
|
|
rc = select(max_sock + 1, &socket_mask, NULL, NULL, &wait_time);
|
|
now = time(NULL);
|
|
|
|
// make sure ciphers are updated before the packet is treated
|
|
if((now - lastTransop) > TRANSOP_TICK_INTERVAL) {
|
|
lastTransop = now;
|
|
|
|
eee->transop.tick(&eee->transop, now);
|
|
}
|
|
|
|
if(rc > 0) {
|
|
// any or all of the FDs could have input; check them all
|
|
|
|
// external
|
|
if((eee->sock >= 0) && FD_ISSET(eee->sock, &socket_mask)) {
|
|
if(0 != fetch_and_eventually_process_data(eee, eee->sock,
|
|
pktbuf, &expected, &position,
|
|
now)) {
|
|
*eee->keep_running = false;
|
|
break;
|
|
}
|
|
if(eee->conf.connect_tcp) {
|
|
if((expected >= N2N_PKT_BUF_SIZE) || (position >= N2N_PKT_BUF_SIZE)) {
|
|
// something went wrong, possibly even before
|
|
// e.g. connection failure/closure in the middle of transmission (between len & data)
|
|
supernode_disconnect(eee);
|
|
eee->sn_wait = 1;
|
|
|
|
expected = sizeof(uint16_t);
|
|
position = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if(FD_ISSET(eee->udp_multicast_sock, &socket_mask)) {
|
|
if(0 != fetch_and_eventually_process_data(eee, eee->udp_multicast_sock,
|
|
pktbuf, &expected, &position,
|
|
now)) {
|
|
*eee->keep_running = false;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(FD_ISSET(eee->udp_mgmt_sock, &socket_mask)) {
|
|
// read from the management port socket
|
|
readFromMgmtSocket(eee);
|
|
|
|
if(!(*eee->keep_running))
|
|
break;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
if(FD_ISSET(eee->device.fd, &socket_mask)) {
|
|
// read an ethernet frame from the TAP socket; write on the IP socket
|
|
edge_read_from_tap(eee);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// finished processing select data
|
|
update_supernode_reg(eee, now);
|
|
|
|
numPurged = 0;
|
|
// keep, i.e. do not purge, the known peers while no supernode supernode connection
|
|
if(!eee->sn_wait)
|
|
numPurged = purge_expired_nodes(&eee->known_peers,
|
|
eee->sock, NULL,
|
|
&last_purge_known,
|
|
PURGE_REGISTRATION_FREQUENCY, REGISTRATION_TIMEOUT);
|
|
numPurged += purge_expired_nodes(&eee->pending_peers,
|
|
eee->sock, NULL,
|
|
&last_purge_pending,
|
|
PURGE_REGISTRATION_FREQUENCY, REGISTRATION_TIMEOUT);
|
|
|
|
if(numPurged > 0) {
|
|
traceEvent(TRACE_INFO, "%u peers removed. now: pending=%u, operational=%u",
|
|
numPurged,
|
|
HASH_COUNT(eee->pending_peers),
|
|
HASH_COUNT(eee->known_peers));
|
|
}
|
|
|
|
#ifdef HAVE_BRIDGING_SUPPORT
|
|
if((eee->conf.allow_routing) && (now > last_purge_host + SWEEP_TIME)) {
|
|
struct host_info *host, *host_tmp;
|
|
HASH_ITER(hh, eee->known_hosts, host, host_tmp) {
|
|
if(now > host->last_seen + HOSTINFO_TIMEOUT) {
|
|
HASH_DEL(eee->known_hosts, host);
|
|
free(host);
|
|
}
|
|
}
|
|
last_purge_host = now;
|
|
}
|
|
#endif
|
|
|
|
if((eee->conf.tuntap_ip_mode == TUNTAP_IP_MODE_DHCP) &&
|
|
((now - lastIfaceCheck) > IFACE_UPDATE_INTERVAL)) {
|
|
uint32_t old_ip = eee->device.ip_addr;
|
|
|
|
traceEvent(TRACE_NORMAL, "re-checking dynamic IP address");
|
|
tuntap_get_address(&(eee->device));
|
|
lastIfaceCheck = now;
|
|
|
|
if((old_ip != eee->device.ip_addr) && eee->cb.ip_address_changed)
|
|
eee->cb.ip_address_changed(eee, old_ip, eee->device.ip_addr);
|
|
}
|
|
|
|
sort_supernodes(eee, now);
|
|
|
|
eee->resolution_request = resolve_check(eee->resolve_parameter, eee->resolution_request, now);
|
|
|
|
if(eee->cb.main_loop_period)
|
|
eee->cb.main_loop_period(eee, now);
|
|
|
|
} /* while */
|
|
|
|
send_unregister_super(eee);
|
|
|
|
#ifdef _WIN32
|
|
WaitForSingleObject(tun_read_thread, INFINITE);
|
|
#endif
|
|
|
|
supernode_disconnect(eee);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
/** Deinitialise the edge and deallocate any owned memory. */
|
|
void edge_term (n2n_edge_t * eee) {
|
|
|
|
resolve_cancel_thread(eee->resolve_parameter);
|
|
|
|
if(eee->sock >= 0)
|
|
closesocket(eee->sock);
|
|
|
|
if(eee->udp_mgmt_sock >= 0)
|
|
closesocket(eee->udp_mgmt_sock);
|
|
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if(eee->udp_multicast_sock >= 0)
|
|
closesocket(eee->udp_multicast_sock);
|
|
#endif
|
|
|
|
clear_peer_list(&eee->pending_peers);
|
|
clear_peer_list(&eee->known_peers);
|
|
clear_peer_list(&eee->conf.supernodes);
|
|
|
|
#ifdef HAVE_BRIDGING_SUPPORT
|
|
if(eee->conf.allow_routing) {
|
|
struct host_info *host, *host_tmp;
|
|
HASH_ITER(hh, eee->known_hosts, host, host_tmp) {
|
|
HASH_DEL(eee->known_hosts, host);
|
|
free(host);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
eee->transop.deinit(&eee->transop);
|
|
eee->transop_lzo.deinit(&eee->transop_lzo);
|
|
#ifdef HAVE_ZSTD
|
|
eee->transop_zstd.deinit(&eee->transop_zstd);
|
|
#endif
|
|
|
|
destroy_network_traffic_filter(eee->network_traffic_filter);
|
|
|
|
closeTraceFile();
|
|
|
|
free(eee);
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
static int edge_init_sockets (n2n_edge_t *eee) {
|
|
|
|
if(eee->udp_mgmt_sock >= 0)
|
|
closesocket(eee->udp_mgmt_sock);
|
|
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
if(eee->udp_multicast_sock >= 0)
|
|
closesocket(eee->udp_multicast_sock);
|
|
#endif
|
|
|
|
eee->udp_mgmt_sock = open_socket(eee->conf.mgmt_port, INADDR_LOOPBACK, 0 /* UDP */);
|
|
if(eee->udp_mgmt_sock < 0) {
|
|
traceEvent(TRACE_ERROR, "failed to bind management UDP port %u", eee->conf.mgmt_port);
|
|
return(-2);
|
|
}
|
|
|
|
#ifndef SKIP_MULTICAST_PEERS_DISCOVERY
|
|
/* Populate the multicast group for local edge */
|
|
eee->multicast_peer.family = AF_INET;
|
|
eee->multicast_peer.port = N2N_MULTICAST_PORT;
|
|
eee->multicast_peer.addr.v4[0] = 224; /* N2N_MULTICAST_GROUP */
|
|
eee->multicast_peer.addr.v4[1] = 0;
|
|
eee->multicast_peer.addr.v4[2] = 0;
|
|
eee->multicast_peer.addr.v4[3] = 68;
|
|
|
|
eee->udp_multicast_sock = open_socket(N2N_MULTICAST_PORT, INADDR_ANY, 0 /* UDP */);
|
|
if(eee->udp_multicast_sock < 0)
|
|
return(-3);
|
|
else {
|
|
u_int enable_reuse = 1;
|
|
|
|
/* allow multiple sockets to use the same PORT number */
|
|
setsockopt(eee->udp_multicast_sock, SOL_SOCKET, SO_REUSEADDR, (char *)&enable_reuse, sizeof(enable_reuse));
|
|
#ifdef SO_REUSEPORT /* no SO_REUSEPORT in Windows / old linux versions */
|
|
setsockopt(eee->udp_multicast_sock, SOL_SOCKET, SO_REUSEPORT, &enable_reuse, sizeof(enable_reuse));
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* ************************************** */
|
|
|
|
|
|
void edge_init_conf_defaults (n2n_edge_conf_t *conf) {
|
|
|
|
char *tmp_string;
|
|
|
|
memset(conf, 0, sizeof(*conf));
|
|
|
|
conf->bind_address = INADDR_ANY; /* any address */
|
|
conf->local_port = 0 /* any port */;
|
|
conf->preferred_sock.family = AF_INVALID;
|
|
conf->mgmt_port = N2N_EDGE_MGMT_PORT; /* 5644 by default */
|
|
conf->transop_id = N2N_TRANSFORM_ID_NULL;
|
|
conf->header_encryption = HEADER_ENCRYPTION_NONE;
|
|
conf->compression = N2N_COMPRESSION_ID_NONE;
|
|
conf->drop_multicast = 1;
|
|
conf->allow_p2p = 1;
|
|
conf->disable_pmtu_discovery = 1;
|
|
conf->register_interval = REGISTER_SUPER_INTERVAL_DFL;
|
|
conf->tuntap_ip_mode = TUNTAP_IP_MODE_SN_ASSIGN;
|
|
/* reserve possible last char as null terminator. */
|
|
gethostname((char*)conf->dev_desc, N2N_DESC_SIZE-1);
|
|
|
|
if(getenv("N2N_KEY")) {
|
|
conf->encrypt_key = strdup(getenv("N2N_KEY"));
|
|
conf->transop_id = N2N_TRANSFORM_ID_AES;
|
|
}
|
|
if(getenv("N2N_COMMUNITY")) {
|
|
strncpy((char*)conf->community_name, getenv("N2N_COMMUNITY"), N2N_COMMUNITY_SIZE);
|
|
conf->community_name[N2N_COMMUNITY_SIZE - 1] = '\0';
|
|
}
|
|
if(getenv("N2N_PASSWORD")) {
|
|
conf->shared_secret = calloc(1, sizeof(n2n_private_public_key_t));
|
|
if(conf->shared_secret)
|
|
generate_private_key(*(conf->shared_secret), getenv("N2N_PASSWORD"));
|
|
}
|
|
|
|
tmp_string = calloc(1, strlen(N2N_MGMT_PASSWORD) + 1);
|
|
if(tmp_string) {
|
|
strncpy((char*)tmp_string, N2N_MGMT_PASSWORD, strlen(N2N_MGMT_PASSWORD) + 1);
|
|
conf->mgmt_password_hash = pearson_hash_64((uint8_t*)tmp_string, strlen(N2N_MGMT_PASSWORD));
|
|
free(tmp_string);
|
|
}
|
|
|
|
conf->sn_selection_strategy = SN_SELECTION_STRATEGY_LOAD;
|
|
conf->metric = 0;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
void edge_term_conf (n2n_edge_conf_t *conf) {
|
|
|
|
if(conf->encrypt_key) free(conf->encrypt_key);
|
|
|
|
if(conf->network_traffic_filter_rules) {
|
|
filter_rule_t *el = 0, *tmp = 0;
|
|
HASH_ITER(hh, conf->network_traffic_filter_rules, el, tmp) {
|
|
HASH_DEL(conf->network_traffic_filter_rules, el);
|
|
free(el);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
const n2n_edge_conf_t* edge_get_conf (const n2n_edge_t *eee) {
|
|
|
|
return(&eee->conf);
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
int edge_conf_add_supernode (n2n_edge_conf_t *conf, const char *ip_and_port) {
|
|
|
|
struct peer_info *sn;
|
|
n2n_sock_t *sock;
|
|
int skip_add;
|
|
int rv = -1;
|
|
|
|
sock = (n2n_sock_t*)calloc(1,sizeof(n2n_sock_t));
|
|
rv = supernode2sock(sock, ip_and_port);
|
|
|
|
if(rv < -2) { /* we accept resolver failure as it might resolve later */
|
|
traceEvent(TRACE_WARNING, "invalid supernode parameter.");
|
|
free(sock);
|
|
return 1;
|
|
}
|
|
|
|
skip_add = SN_ADD;
|
|
sn = add_sn_to_list_by_mac_or_sock(&(conf->supernodes), sock, null_mac, &skip_add);
|
|
|
|
if(sn != NULL) {
|
|
sn->ip_addr = calloc(1, N2N_EDGE_SN_HOST_SIZE);
|
|
|
|
if(sn->ip_addr != NULL) {
|
|
strncpy(sn->ip_addr, ip_and_port, N2N_EDGE_SN_HOST_SIZE - 1);
|
|
memcpy(&(sn->sock), sock, sizeof(n2n_sock_t));
|
|
memcpy(sn->mac_addr, null_mac, sizeof(n2n_mac_t));
|
|
sn->purgeable = false;
|
|
}
|
|
}
|
|
|
|
free(sock);
|
|
|
|
traceEvent(TRACE_NORMAL, "adding supernode = %s", sn->ip_addr);
|
|
conf->sn_num++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ************************************** */
|
|
|
|
int quick_edge_init (char *device_name, char *community_name,
|
|
char *encrypt_key, char *device_mac,
|
|
char *local_ip_address,
|
|
char *supernode_ip_address_port,
|
|
bool *keep_on_running) {
|
|
|
|
tuntap_dev tuntap;
|
|
n2n_edge_t *eee;
|
|
n2n_edge_conf_t conf;
|
|
int rv;
|
|
|
|
/* Setup the configuration */
|
|
edge_init_conf_defaults(&conf);
|
|
conf.encrypt_key = encrypt_key;
|
|
conf.transop_id = N2N_TRANSFORM_ID_AES;
|
|
conf.compression = N2N_COMPRESSION_ID_NONE;
|
|
snprintf((char*)conf.community_name, sizeof(conf.community_name), "%s", community_name);
|
|
edge_conf_add_supernode(&conf, supernode_ip_address_port);
|
|
|
|
/* Validate configuration */
|
|
if(edge_verify_conf(&conf) != 0)
|
|
return(-1);
|
|
|
|
/* Open the tuntap device */
|
|
if(tuntap_open(&tuntap, device_name, "static",
|
|
local_ip_address, "255.255.255.0",
|
|
device_mac, DEFAULT_MTU
|
|
#ifdef _WIN32
|
|
, 0
|
|
#endif
|
|
) < 0)
|
|
return(-2);
|
|
|
|
/* Init edge */
|
|
if((eee = edge_init(&conf, &rv)) == NULL)
|
|
goto quick_edge_init_end;
|
|
|
|
eee->keep_running = keep_on_running;
|
|
rv = run_edge_loop(eee);
|
|
edge_term(eee);
|
|
edge_term_conf(&conf);
|
|
|
|
quick_edge_init_end:
|
|
tuntap_close(&tuntap);
|
|
return(rv);
|
|
}
|
|
|
|
/* ************************************** */
|