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Add the callbacks API

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Callbacks allow n2n API users to extend n2n without modifying the upstream code. This also allows us
to move the hin2n code, which is specific of android, out of the n2n repository.
This commit is contained in:
emanuele-f
2020-06-30 13:01:37 +02:00
parent c6b7b67a6a
commit 346631ffe8
2 changed files with 83 additions and 66 deletions
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include/n2n.h
+35 -2
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@@ -215,6 +215,36 @@ typedef struct n2n_route {
in_addr_t gateway;
} n2n_route_t;
typedef struct n2n_edge n2n_edge_t; /* Opaque, see edge_utils.c */
/* *************************************************** */
typedef enum {
N2N_ACCEPT = 0,
N2N_DROP = 1
} n2n_verdict;
/* *************************************************** */
/* Callbacks allow external programs to attach functions in response to
* N2N events. */
typedef struct n2n_edge_callbacks {
/* The supernode registration has been updated */
void (*sn_registration_updated)(n2n_edge_t *eee, time_t now, const n2n_sock_t *sn);
/* A packet has been received from a peer. N2N_DROP can be returned to
* drop the packet. The packet payload can be modified. */
n2n_verdict (*packet_from_peer)(n2n_edge_t *eee, const n2n_sock_t *peer, uint8_t *payload, uint16_t payload_size);
/* A packet has been received from the TAP interface. N2N_DROP can be
* returned to drop the packet. The packet payload can be modified. */
n2n_verdict (*packet_from_tap)(n2n_edge_t *eee, uint8_t *payload, uint16_t payload_size);
void (*ip_address_changed)(n2n_edge_t *eee, uint32_t old_ip, uint32_t new_ip);
} n2n_edge_callbacks_t;
/* *************************************************** */
typedef struct n2n_edge_conf {
n2n_sn_name_t sn_ip_array[N2N_EDGE_NUM_SUPERNODES];
n2n_route_t *routes; /**< Networks to route through n2n */
@@ -238,8 +268,6 @@ typedef struct n2n_edge_conf {
int mgmt_port;
} n2n_edge_conf_t;
typedef struct n2n_edge n2n_edge_t; /* Opaque, see edge_utils.c */
typedef struct sn_stats
{
size_t errors; /* Number of errors encountered. */
@@ -351,6 +379,11 @@ void edge_term_conf(n2n_edge_conf_t *conf);
/* Public functions */
n2n_edge_t* edge_init(const tuntap_dev *dev, const n2n_edge_conf_t *conf, int *rv);
void edge_term(n2n_edge_t *eee);
void edge_set_callbacks(n2n_edge_t *eee, const n2n_edge_callbacks_t *callbacks);
void edge_set_userdata(n2n_edge_t *eee, void *user_data);
void* edge_get_userdata(n2n_edge_t *eee);
void edge_send_packet2net(n2n_edge_t *eee, uint8_t *tap_pkt, size_t len);
void edge_read_from_tap(n2n_edge_t *eee);
int run_edge_loop(n2n_edge_t *eee, int *keep_running);
int quick_edge_init(char *device_name, char *community_name,
char *encrypt_key, char *device_mac,