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Implement NAT trick for outbound SIP connections

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1998 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Jeremy McNamara
2004-01-13 01:31:42 +00:00
parent 8c83933000
commit c5dcbb9901
1 changed files with 54 additions and 27 deletions
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81
channels/chan_sip.c
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@@ -394,9 +394,12 @@ static struct sip_registry *registrations;
static int sipsock = -1;
static int globalnat = 0;
static int globalcanreinvite = REINVITE_INVITE;
static int use_external_ip = 0;
static struct sockaddr_in bindaddr;
static struct sockaddr_in localnet;
static struct sockaddr_in localmask;
static struct sockaddr_in externip;
static struct ast_frame *sip_read(struct ast_channel *ast);
static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req);
@@ -434,14 +437,18 @@ static void sip_destroy(struct sip_pvt *p);
static int ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us)
{
if (use_external_ip) {
return -1;
} else {
if (bindaddr.sin_addr.s_addr)
memcpy(us, &bindaddr.sin_addr, sizeof(struct in_addr));
else
return ast_ouraddrfor(them, us);
}
/*
check to see if them is contained in our localnet/mask,
if not, use our externip for us, otherwise use the
real internal address in bindaddr
*/
if (localnet.sin_addr.s_addr && externip.sin_addr.s_addr &&
((htonl(them->s_addr) & htonl(localnet.sin_addr.s_addr)) != htonl(localnet.sin_addr.s_addr)))
memcpy(us, &externip.sin_addr, sizeof(struct in_addr));
else if (bindaddr.sin_addr.s_addr)
memcpy(us, &bindaddr.sin_addr, sizeof(struct in_addr));
else
return ast_ouraddrfor(them, us);
return 0;
}
@@ -3018,6 +3025,8 @@ static int transmit_register(struct sip_registry *r, char *cmd, char *auth, char
char via[80];
char addr[80];
struct sip_pvt *p;
struct hostent *hp;
/* exit if we are already in process with this registrar ?*/
if ( r == NULL || ((auth==NULL) && (r->regstate==REG_STATE_REGSENT || r->regstate==REG_STATE_AUTHSENT))) {
ast_log(LOG_NOTICE, "Strange, trying to register when registration already pending\n");
@@ -3051,9 +3060,16 @@ static int transmit_register(struct sip_registry *r, char *cmd, char *auth, char
strncpy(p->peername, r->username, sizeof(p->peername)-1);
strncpy(p->username, r->username, sizeof(p->username)-1);
strncpy(p->exten, r->contact, sizeof(p->exten) - 1);
/* Always bind to our IP if specified */
if (!use_external_ip && bindaddr.sin_addr.s_addr)
memcpy(&p->ourip, &bindaddr.sin_addr, sizeof(p->ourip));
/*
check which address we should use in our contact header
based on whether the remote host is on the external or
internal network so we can register through nat
*/
if ((hp = gethostbyname(r->hostname))) {
if (ast_sip_ouraddrfor((struct in_addr *)hp->h_addr, &p->ourip))
memcpy(&p->ourip, &bindaddr.sin_addr, sizeof(p->ourip));
}
build_contact(p);
}
@@ -6135,6 +6151,10 @@ static int reload_config(void)
sip_prefs_free();
memset(&bindaddr, 0, sizeof(bindaddr));
memset(&localnet, 0, sizeof(localnet));
memset(&localmask, 0, sizeof(localmask));
memset(&externip, 0, sizeof(externip));
/* Initialize some reasonable defaults */
strncpy(context, "default", sizeof(context) - 1);
strcpy(language, "");
@@ -6195,13 +6215,21 @@ static int reload_config(void)
} else {
memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
}
} else if (!strcasecmp(v->name, "localnet")) {
if (!(hp = gethostbyname(v->value)))
ast_log(LOG_WARNING, "Invalid localnet keyword: %s\n", v->value);
else
memcpy(&localnet.sin_addr, hp->h_addr, sizeof(localnet.sin_addr));
} else if (!strcasecmp(v->name, "localmask")) {
if (!(hp = gethostbyname(v->value)))
ast_log(LOG_WARNING, "Invalid localmask keyword: %s\n", v->value);
else
memcpy(&localmask.sin_addr, hp->h_addr, sizeof(localmask.sin_addr));
} else if (!strcasecmp(v->name, "externip")) {
if (!(hp = gethostbyname(v->value))) {
if (!(hp = gethostbyname(v->value)))
ast_log(LOG_WARNING, "Invalid address for externip keyword: %s\n", v->value);
} else {
memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
use_external_ip = 1;
}
else
memcpy(&externip.sin_addr, hp->h_addr, sizeof(externip.sin_addr));
} else if (!strcasecmp(v->name, "allow")) {
format = ast_getformatbyname(v->value);
if (format < 1)
@@ -6276,17 +6304,16 @@ static int reload_config(void)
}
cat = ast_category_browse(cfg, cat);
}
if (!use_external_ip) {
if (ntohl(bindaddr.sin_addr.s_addr)) {
memcpy(&__ourip, &bindaddr.sin_addr, sizeof(__ourip));
} else {
hp = gethostbyname(ourhost);
if (!hp) {
ast_log(LOG_WARNING, "Unable to get IP address for %s, SIP disabled\n", ourhost);
return 0;
}
memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
if (ntohl(bindaddr.sin_addr.s_addr)) {
memcpy(&__ourip, &bindaddr.sin_addr, sizeof(__ourip));
} else {
hp = gethostbyname(ourhost);
if (!hp) {
ast_log(LOG_WARNING, "Unable to get IP address for %s, SIP disabled\n", ourhost);
return 0;
}
memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
}
if (!ntohs(bindaddr.sin_port))
bindaddr.sin_port = ntohs(DEFAULT_SIP_PORT);