[Serusers] Parsing Message

[Stephan Reiff-Marganiec]

If I have a SIP message in a char* variable, then I assume that I can parse
it into a struct sip_msg* using a function in ser. The most obvious function
seems to be parse_msg(). This does not seem to work to my expectation.

Here is a code snippet (which is close to the code in receive.c):

char* response // contains my message
struct sip_msg msg // this is were the result should go

memset(msg, 0, sizeof(struct sip_msg));
response[len] = 0;
msg->buf = response;
msg->len = len;
if (parse_msg(response, len, msg))!=0) {
  LOG(L_ERR, "ERROR");
}
LOG(L_ERR, "After parse msg ...")
dump_sip_msg(msg) // this just prints the fields of the message to LOG

dump_sip_msg() works fine on the incoming sip message, so the problem is
either in my SIP message or in my use of the parse function. However, I
think my message is fine (it is the received message with the first line
replaced with SIP/2.0 600 Policy Server Msg date time). I enclose a cut from
/var/log/messages.

Stephan


/var/log/messages:

Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: After parse_msg...
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: polserv: dump_sip_msg()
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->id: int = 0
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->first_line:
msg_start (rep) 600 Policy Server Msg 2003-03-07 14:52:24^M Via: SIP/2.0/UDP
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: DEBUG: dump_hdr_field:
type=1, name=Via, body=SIP/2.0/UDP 139.153.254.196:5062, parsed=0x80a584c,
next=(nil)
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: DEBUG: dump_hdr_field:
type=1, name=Via, body=SIP/2.0/UDP 139.153.254.196:5062, parsed=0x80a584c,
next=(nil)
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->parsed_flag 1
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: DEBUG: dump_hdr_field:
type=1, name=Via, body=SIP/2.0/UDP 139.153.254.196:5062, parsed=0x80a584c,
next=(nil)
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: DEBUG: dump_hdr_field:
field is NULL
Mar  7 14:52:41 d254196 last message repeated 20 times
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->eoh: (null)
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->unparsed: CSeq: 7635
REGISTER^M To: "Stephan" <sip:mrs at cs.stir.ac.uk>^M Expires: 900^M From:
"Stephan" <sip:mrs at cs.stir.ac.uk>^M Call-Id: 138108089 at 139.153.254.196^M
User-Agent: KPhone/2.11^M Event: registration^M Allow-Events: presence^M
Contact: "root"
<sip:root at 139.153.254.196:5062;transport=UDP>;methods="INVITE, MESSAGE,
INFO, SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, ACK"^M Content-Length: 0^M ^M
^M
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->buf: SIP/2.0 600
Policy Server Msg 2003-03-07 14:52:24^M Via: SIP/2.0/UDP
139.153.254.196:5062^M CSeq: 7635 REGISTER^M To: "Stephan"
<sip:mrs at cs.stir.ac.uk>^M Expires: 900^M From: "Stephan"
<sip:mrs at cs.stir.ac.uk>^M Call-Id: 138108089 at 139.153.254.196^M User-Agent:
KPhone/2.11^M Event: registration^M Allow-Events: presence^M Contact: "root"
<sip:root at 139.153.254.196:5062;transport=UDP>;methods="INVITE, MESSAGE,
INFO, SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, ACK"^M Content-Length: 0^M ^M
^M
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->len: 475
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: msg->parsed_uri_ok: int =
0
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: polserv: all fine,
returning now ...
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: ERROR: parse_sip_msg_uri:
bad uri <600>
Mar  7 14:52:41 d254196 /usr/local/sbin/ser[9566]: WARNING: do_action:error
in expression



--
Dr Stephan Reiff-Marganiec
Research Fellow
Department of Computing Science; University of Stirling
email: srm at cs.stir.ac.uk    tel: 01786 46 7448

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