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chan_sip: Fix SUBSCRIBE with missing "Expires" header.

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When chan_sip receives a SUBSCRIBE request with no "Expires" header it
processes the request as an unsubscribe.  This is incorrect, per RFC3264
when the "Expires" header is missing a default expiry should be used.

ASTERISK-18140

Change-Id: Ibf6dcd4fdd07a32c2bc38be1dd557981f08188b5
This commit is contained in:
Corey Farrell
2017-10-24 10:43:15 -04:00
parent e7d8b4ebe7
commit c95ab4c1ce
1 changed files with 7 additions and 1 deletions
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8
channels/chan_sip.c
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@@ -28460,7 +28460,13 @@ static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req,
p->lastinvite = seqno;
}
if (!p->needdestroy) {
p->expiry = atoi(sip_get_header(req, "Expires"));
const char *expires_str = sip_get_header(req, "Expires");
if (ast_strlen_zero(expires_str)) {
p->expiry = default_expiry;
} else {
p->expiry = atoi(expires_str);
}
/* check if the requested expiry-time is within the approved limits from sip.conf */
if (p->expiry > max_subexpiry) {