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allow explicit source address/port selection for peers (bug #4257, with minor mods)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6096 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2005-07-12 02:19:41 +00:00
parent b06daf5859
commit d7e09f233f
3 changed files with 106 additions and 0 deletions
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88
channels/chan_iax2.c
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@@ -7827,6 +7827,92 @@ static int get_auth_methods(char *value)
}
/*--- check_src_ip: Check if address can be used as packet source.
returns:
0 address available
1 address unavailable
-1 error
*/
static int check_srcaddr(struct sockaddr *sa, socklen_t salen)
{
int sd;
int res;
sd = socket(AF_INET, SOCK_DGRAM, 0);
if (sd < 0) {
ast_log(LOG_ERROR, "Socket: %s\n", strerror(errno));
return -1;
}
res = bind(sd, sa, salen);
if (res < 0) {
ast_log(LOG_DEBUG, "Can't bind: %s\n", strerror(errno));
close(sd);
return 1;
}
close(sd);
return 0;
}
/*--- peer_set_srcaddr: Parse the "sourceaddress" value,
lookup in netsock list and set peer's sockfd. Defaults to defaultsockfd if
not found. */
static int peer_set_srcaddr(struct iax2_peer *peer, const char *srcaddr)
{
struct sockaddr_in sin;
int nonlocal = 1;
int port = IAX_DEFAULT_PORTNO;
int sockfd = defaultsockfd;
char *tmp;
char *addr;
char *portstr;
tmp = ast_strdupa(srcaddr);
if (!tmp) {
ast_log(LOG_WARNING, "Out of memory!\n");
return -1;
}
addr = strsep(&tmp, ":");
portstr = tmp;
if (portstr) {
port = atoi(portstr);
if (port < 1)
port = IAX_DEFAULT_PORTNO;
}
if (!ast_get_ip(&sin, tmp)) {
struct ast_netsock *sock;
int res;
sin.sin_port = 0;
res = check_srcaddr((struct sockaddr *) &sin, sizeof(sin));
if (res == 0) {
/* ip address valid. */
sin.sin_port = htons(port);
sock = ast_netsock_find(&netsock, &sin);
if (sock) {
sockfd = ast_netsock_sockfd(sock);
nonlocal = 0;
}
}
}
peer->sockfd = sockfd;
if (nonlocal) {
ast_log(LOG_WARNING, "Non-local or unbound address specified (%s) in sourceaddress for '%s', reverting to default\n",
srcaddr, peer->name);
return -1;
} else {
ast_log(LOG_DEBUG, "Using sourceaddress %s for '%s'\n", srcaddr, peer->name);
return 0;
}
}
/*--- build_peer: Create peer structure based on configuration */
static struct iax2_peer *build_peer(const char *name, struct ast_variable *v, int temponly)
{
@@ -7943,6 +8029,8 @@ static struct iax2_peer *build_peer(const char *name, struct ast_variable *v, in
free(peer);
return NULL;
}
} else if (!strcasecmp(v->name, "sourceaddress")) {
peer_set_srcaddr(peer, v->value);
} else if (!strcasecmp(v->name, "permit") ||
!strcasecmp(v->name, "deny")) {
peer->ha = ast_append_ha(v->name, v->value, peer->ha);