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Merged revisions 295673 via svnmerge from

Browse source 
https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r295673 | twilson | 2010-11-19 14:06:10 -0800 (Fri, 19 Nov 2010) | 22 lines
  
  Merged revisions 295672 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r295672 | twilson | 2010-11-19 13:55:48 -0800 (Fri, 19 Nov 2010) | 15 lines
    
    Merged revisions 295628 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
    ........
      r295628 | twilson | 2010-11-19 12:53:36 -0800 (Fri, 19 Nov 2010) | 8 lines
      
      Discard responses with more than one Via
      
      This is not a perfect solution as headers that are joined via commas are not
      detected. This is a parsing issue that to fix "correctly" would necessitate 
      a new SIP parser.
      
      Review: https://reviewboard.asterisk.org/r/1019/
    ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@295674 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Terry Wilson 2010-11-19 22:15:49 +00:00
parent b54348691a
commit e5ede71934
1 changed files with 19 additions and 3 deletions
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22
channels/chan_sip.c
View file

@ -23674,6 +23674,9 @@ static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct as
const char *cmd;
const char *cseq;
const char *useragent;
const char *via;
const char *callid;
int via_pos = 0;
int seqno;
int len;
int respid;
@ -23684,13 +23687,19 @@ static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct as
int oldmethod = p->method;
int acked = 0;
/* Get Method and Cseq */
/* RFC 3261 - 8.1.1 A valid SIP request must contain To, From, CSeq, Call-ID and Via.
* 8.2.6.2 Response must have To, From, Call-ID CSeq, and Via related to the request,
* so we can check to make sure these fields exist for all requests and responses */
cseq = get_header(req, "Cseq");
cmd = REQ_OFFSET_TO_STR(req, header[0]);
/* Save the via_pos so we can check later that responses only have 1 Via header */
via = __get_header(req, "Via", &via_pos);
/* This must exist already because we've called find_call by now */
callid = get_header(req, "Call-ID");
/* Must have Cseq */
if (ast_strlen_zero(cmd) || ast_strlen_zero(cseq)) {
ast_log(LOG_ERROR, "Missing Cseq. Dropping this SIP message, it's incomplete.\n");
if (ast_strlen_zero(cmd) || ast_strlen_zero(cseq) || ast_strlen_zero(via)) {
ast_log(LOG_ERROR, "Dropping this SIP message with Call-ID '%s', it's incomplete.\n", callid);
error = 1;
}
if (!error && sscanf(cseq, "%30d%n", &seqno, &len) != 1) {
@ -23732,6 +23741,13 @@ static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct as
ast_log(LOG_WARNING, "Invalid SIP response code: '%d'\n", respid);
return 0;
}
/* RFC 3261 - 8.1.3.3 If more than one Via header field value is present in a reponse
* the UAC SHOULD discard the message. This is not perfect, as it will not catch multiple
* headers joined with a comma. Fixing that would pretty much involve writing a new parser */
if (!ast_strlen_zero(__get_header(req, "via", &via_pos))) {
ast_log(LOG_WARNING, "Misrouted SIP response '%s' with Call-ID '%s', too many vias\n", e, callid);
return 0;
}
if (p->ocseq && (p->ocseq < seqno)) {
ast_debug(1, "Ignoring out of order response %d (expecting %d)\n", seqno, p->ocseq);
return -1;