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handle rport/received in Via headers properly (issue #5037)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6582 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2005-09-14 01:53:06 +00:00
parent 8f537c4378
commit 07a06d83a4
1 changed files with 41 additions and 19 deletions
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44
channels/chan_sip.c
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@@ -3627,36 +3627,58 @@ static int copy_all_header(struct sip_request *req, struct sip_request *orig, ch
return copied ? 0 : -1;
}
/*--- copy_via_headers: Copy SIP VIA Headers from one request to another ---*/
/*--- copy_via_headers: Copy SIP VIA Headers from the request to the response ---*/
/* If the client indicates that it wishes to know the port we received from,
it adds ;rport without an argument to the topmost via header. We need to
add the port number (from our point of view) to that parameter.
We always add ;received=<ip address> to the topmost via header.
Received: RFC 3261, rport RFC 3581 */
static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, struct sip_request *orig, char *field)
{
char tmp[256], *oh, *end;
int start = 0;
int copied = 0;
char new[256];
char iabuf[INET_ADDRSTRLEN];
for (;;) {
oh = __get_header(orig, field, &start);
if (!ast_strlen_zero(oh)) {
/* Strip ;rport */
if (!copied) { /* Only check for empty rport in topmost via header */
char *rport;
char new[256];
/* Find ;rport; (empty request) */
rport = strstr(oh, ";rport");
if (rport && *(rport+6) == '=')
rport = NULL; /* We already have a parameter to rport */
if (rport && (ast_test_flag(p, SIP_NAT) == SIP_NAT_ALWAYS)) {
/* We need to add received port - rport */
ast_copy_string(tmp, oh, sizeof(tmp));
oh = strstr(tmp, ";rport");
if (oh) {
end = strchr(oh + 1, ';');
rport = strstr(tmp, ";rport");
if (rport) {
end = strchr(rport + 1, ';');
if (end)
memmove(oh, end, strlen(end) + 1);
memmove(rport, end, strlen(end) + 1);
else
*oh = '\0';
*rport = '\0';
}
if (!copied && (ast_test_flag(p, SIP_NAT) == SIP_NAT_ALWAYS)) {
/* Add rport to first VIA header if requested */
/* Whoo hoo! Now we can indicate port address translation too! Just
another RFC (RFC3581). I'll leave the original comments in for
posterity. */
snprintf(new, sizeof(new), "%s;received=%s;rport=%d", tmp, ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr), ntohs(p->recv.sin_port));
} else {
/* We should *always* add a received to the topmost via */
snprintf(new, sizeof(new), "%s;received=%s", oh, ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr));
}
add_header(req, field, new);
} else {
/* Add what we're responding to */
add_header(req, field, tmp);
/* Add the following via headers untouched */
add_header(req, field, oh);
}
copied++;
} else