Re: [osip-dev] Issue with osip_message

Hi Again,

In the early days, osip wasn't supporting binary attachement and was focusing

on application/sdp. For a long time, binary attachement are supported, but the

current code does't accept attachement without content-length (so UDP) except if

the content-type is application/sdp.

Because we have full size of packet today, this restriction doesn't look necessary

any more and we can accept any content-type when content-legnth is missing.

diff --git a/src/osipparser2/osip_message_parse.c b/src/osipparser2/osip_message_parse.c

index e305cf0..28c6411 100644

--- a/src/osipparser2/osip_message_parse.c

+++ b/src/osipparser2/osip_message_parse.c

@@ -706,19 +706,11 @@ msg_osip_body_parse (osip_message_t * sip, const char *start_of_buf, const char

else {

/* if content_length does not exist, set it. */

char tmp[16];

- /* case where content-length is missing but the

- body only contains non-binary data */

- if (0 == osip_strcasecmp (sip->content_type->type, "application")

- && 0 == osip_strcasecmp (sip->content_type->subtype, "sdp")) {

- osip_body_len = strlen (start_of_body);

- sprintf (tmp, "%i", (int) osip_body_len);

- i = osip_message_set_content_length (sip, tmp);

- if (i != 0)

- return i;

- }

- else

- return OSIP_SYNTAXERROR; /* Content-type may be non binary data */

+ osip_body_len = length;

+ sprintf (tmp, "%i", (int) osip_body_len);

+ i = osip_message_set_content_length (sip, tmp);

+ if (i != 0)

+ return i;

}

if (length < osip_body_len) {

@@ -866,9 +858,19 @@ _osip_message_parse (osip_message_t * sip, const char *buf, size_t length, int s

}

tmp = (char *) next_header_index;

- /* this is a *very* simple test... (which handle most cases...) */

- if (tmp[0] == '\0' || tmp[1] == '\0' || tmp[2] == '\0') {

- /* this is mantory in the oSIP stack */

+ if (sip->content_length != NULL && sip->content_length->value == NULL) {

+ /* empty content_length header */

+ osip_content_length_free(sip->content_length);

+ sip->content_length=NULL;

+ }

+ if (sip->content_length != NULL && sip->content_length->value != NULL && atoi(sip->content_length->value) >0) {

+ /* body exist */

+ } else if (sip->content_length == NULL && '\r' == next_header_index[0] && '\n' == next_header_index[1] && length - (tmp - beg) - (2) >0) {

+ /* body exist */

+ } else if (sip->content_length == NULL && '\n' == next_header_index[0] && length - (tmp - beg) - (1) >0) {

+ /* body exist */

+ } else {

if (sip->content_length == NULL)

osip_message_set_content_length (sip, "0");

osip_free (beg);

That's my final proposal!

If you wish to report on this, I'll be interested to know opinions and experience.

Regards

Aymeric

2015-01-30 10:27 GMT+01:00 Aymeric Moizard <address@hidden>:

Hi Paul,

Your other sip client is starting the body with "\0" and
that break the parsing? right?

Having UTF16 inside the body is allowed and thus, \0
is allowed as the first char in the body.

Is this what you are reporting?

Look like you are right. I'm working on a different patch
which would be more compliant.

What do you think about this: I think this is handling every case in an exact way.

1/ if the content-length >0, we parse the body
2/ if the content-length is missing (UDP/connection-less protocol), we trust the remaining "size"
(if there is no content-length)
3/ there is no check for \0 any more.

diff --git a/src/osipparser2/osip_message_parse.c b/src/osipparser2/osip_message_parse.c
index e305cf0..8108fa8 100644
--- a/src/osipparser2/osip_message_parse.c
+++ b/src/osipparser2/osip_message_parse.c
@@ -866,9 +866,19 @@ _osip_message_parse (osip_message_t * sip, const char *buf, size_t length, int s
}
tmp = (char *) next_header_index;

- /* this is a *very* simple test... (which handle most cases...) */
- if (tmp[0] == '\0' || tmp[1] == '\0' || tmp[2] == '\0') {
- /* this is mantory in the oSIP stack */
+ if (sip->content_length != NULL && sip->content_length->value == NULL) {
+ /* empty content_length header */
+ osip_content_length_free(sip->content_length);
+ sip->content_length=NULL;
+ }
+
+ if (sip->content_length != NULL && sip->content_length->value != NULL && atoi(sip->content_length->value) >0) {
+ /* body exist */
+ } else if (sip->content_length == NULL && '\r' == next_header_index[0] && '\n' == next_header_index[1] && length - (tmp - beg) - (2) >0) {
+ /* body exist */
+ } else if (sip->content_length == NULL && '\n' == next_header_index[0] && length - (tmp - beg) - (1) >0) {
+ /* body exist */
+ } else {
if (sip->content_length == NULL)
osip_message_set_content_length (sip, "0");
osip_free (beg);

Regards
Aymeric

2015-01-29 4:09 GMT+01:00 Paul Whitfield <address@hidden>:

Hi All,

I have come across and issue using osip2 in a particular application.

The device I am communicating with sends a SIP message with content that is encoded as UTF16.

This device is from a 3^rd party so I cannot change it L

This caused the test in osip_message_parse.c to fail. The following test

   /* this is a *very* simple test... (which handle most cases...) */

    if (tmp[0] == '\0' || tmp[1] == '\0' || tmp[2] == '\0')

    {

        /* this is mantory in the oSIP stack */

        if (sip->content_length == NULL)

            osip_message_set_content_length(sip, "0");

        osip_free(beg);

        return OSIP_SUCCESS;    /* no body found */

    }

I propose the following fix:

    /* this is a *very* simple test... (which handle most cases...) */

    /* IGNORE this test if we have a content length */

    if ( ( ( sip->content_length == 0 ) || ( atoi(sip->content_length->value) == 0 ) ) &&

         ( (tmp[0] == '\0') || (tmp[1] == '\0' ) || (tmp[2] == '\0') ) )

    {

        /* this is mandatory in the oSIP stack */

        if (sip->content_length == NULL)

        {

            osip_message_set_content_length(sip, "0");

        }

        osip_free(beg);

        return OSIP_SUCCESS;    /* no body found */

    }

If this is acceptable I can make / send a patch against osip4.1.

Best regards

Paul Whitfield.

Example of the message that is causing the problem:

MESSAGE sip:address@hidden SIP/2.0

Via: SIP/2.0/UDP 192.168.20.203:5060;rport;branch=z9hG4bK7053

From: <sip:address@hidden>;tag=18062

To: <sip:address@hidden>

Call-ID: 8376

CSeq: 20 MESSAGE

Content-Type: text/plain; charset=utf-16

Max-Forwards: 70

User-Agent: HYTERA SIP 1.1

Ais-Reach: individual

Ais-Service: text-msg

Ais-Options: slot=1

Content-Length:    20

\000T\000h\000a\000n\000k\000 \000Y\000o\000u\000!

--
Antisip - http://www.antisip.com

Antisip - http://www.antisip.com

From:	Aymeric Moizard
Subject:	Re: [osip-dev] Issue with osip_message_parse
Date:	Fri, 30 Jan 2015 11:33:11 +0100

Re: [osip-dev] Issue with osip_message_parse