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relocated 'detect_local_ip_address()' (#792)

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Logan oos Even 2021-09-16 14:15:21 +05:45 committed by GitHub
parent 9c22d28562
commit 05f40c64db
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1 changed files with 0 additions and 47 deletions
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src/n2n.c
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@ -61,53 +61,6 @@ SOCKET open_socket (int local_port, in_addr_t address, int type /* 0 = UDP, TCP
}
int detect_local_ip_address (n2n_sock_t* out_sock, const n2n_edge_t* eee) {
struct sockaddr_in local_sock;
struct sockaddr_in sn_sock;
socklen_t sock_len = sizeof(local_sock);
SOCKET probe_sock;
out_sock->family = AF_INVALID;
// always detetct local port even/especially if chosen by OS...
if((getsockname(eee->sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
&& (local_sock.sin_family == AF_INET)
&& (sock_len == sizeof(local_sock)))
// remember the port number
out_sock->port = ntohs(local_sock.sin_port);
else
return -1;
// probe for local IP address
probe_sock = socket(PF_INET, SOCK_DGRAM, 0);
// connecting the UDP socket makes getsockname read the local address it uses to connect (to the sn in this case);
// we cannot do it with the real (eee->sock) socket because socket does not accept any conenction from elsewhere then,
// e.g. from another edge instead of the supernode; as re-connecting to AF_UNSPEC might not work to release the socket
// on non-UNIXoids, we use a temporary socket
if((int)probe_sock >= 0) {
fill_sockaddr((struct sockaddr*)&sn_sock, sizeof(sn_sock), &eee->curr_sn->sock);
if(connect(probe_sock, (struct sockaddr *)&sn_sock, sizeof(sn_sock)) == 0) {
if((getsockname(probe_sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
&& (local_sock.sin_family == AF_INET)
&& (sock_len == sizeof(local_sock))) {
memcpy(&(out_sock->addr.v4), &(local_sock.sin_addr.s_addr), IPV4_SIZE);
} else
return -4;
} else
return -3;
closesocket(probe_sock);
} else
return -2;
out_sock->family = AF_INET;
return 0;
}
static int traceLevel = 2 /* NORMAL */;
static int useSyslog = 0, syslog_opened = 0;
static FILE *traceFile = NULL;