The Tor Browser: media/mtransport/third_party/nICEr/src/ice/ice

media/mtransport/third_party/nICEr/src/ice/ice_parser.c@6474c204b198 (annotated)

media/mtransport/third_party/nICEr/src/ice/ice_parser.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
 Copyright (c) 2007, Adobe Systems, Incorporated
 All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:
 * Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 * Neither the name of Adobe Systems, Network Resonance nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 static char *RCSSTRING __UNUSED__="$Id: ice_parser.c,v 1.2 2008/04/28 17:59:01 ekr Exp $";
 #include <csi_platform.h>
 #include <sys/types.h>
 #ifdef WIN32
 #include <winsock2.h>
 #else
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <strings.h>
 #endif
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
 #include "nr_api.h"
 #include "ice_ctx.h"
 #include "ice_candidate.h"
 #include "ice_reg.h"
 static void
 skip_whitespace(char **str)
 {
     char *c = *str;
     while (*c == ' ')
         ++c;
     *str = c;
 }
 static void
 fast_forward(char **str, int skip)
 {
     char *c = *str;
     while (*c != '\0' && skip-- > 0)
         ++c;
     *str = c;
 }
 static void
 skip_to_past_space(char **str)
 {
     char *c = *str;
     while (*c != ' ' && *c != '\0')
         ++c;
     *str = c;
     skip_whitespace(str);
 }
 static int
 grab_token(char **str, char **out)
 {
     int _status;
     char *c = *str;
     int len;
     char *tmp;
     while (*c != ' ' && *c != '\0')
         ++c;
     len = c - *str;
     tmp = RMALLOC(len + 1);
     if (!tmp)
         ABORT(R_NO_MEMORY);
     memcpy(tmp, *str, len);
     tmp[len] = '\0';
     *str = c;
     *out = tmp;
     _status = 0;
 abort:
     return _status;
 }
 int
 nr_ice_peer_candidate_from_attribute(nr_ice_ctx *ctx,char *orig,nr_ice_media_stream *stream,nr_ice_candidate **candp)
 {
     int r,_status;
     char* str = orig;
     nr_ice_candidate *cand;
     char *connection_address=0;
     unsigned int port;
     in_addr_t addr;
     int i;
     unsigned int component_id;
     char *rel_addr=0;
     if(!(cand=RCALLOC(sizeof(nr_ice_candidate))))
         ABORT(R_NO_MEMORY);
     if(!(cand->label=r_strdup(orig)))
         ABORT(R_NO_MEMORY);
     cand->ctx=ctx;
     cand->isock=0;
     cand->state=NR_ICE_CAND_PEER_CANDIDATE_UNPAIRED;
     cand->stream=stream;
     skip_whitespace(&str);
     /* Candidate attr */
     if (strncasecmp(str, "candidate:", 10))
         ABORT(R_BAD_DATA);
     fast_forward(&str, 10);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     skip_whitespace(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* Foundation */
     if ((r=grab_token(&str, &cand->foundation)))
         ABORT(r);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     skip_whitespace(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* component */
     if (sscanf(str, "%u", &component_id) != 1)
         ABORT(R_BAD_DATA);
     if (component_id < 1 || component_id > 256)
         ABORT(R_BAD_DATA);
     cand->component_id = (UCHAR)component_id;
     skip_to_past_space(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* Protocol */
     if (strncasecmp(str, "UDP", 3))
         ABORT(R_BAD_DATA);
     fast_forward(&str, 3);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     skip_whitespace(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* priority */
     if (sscanf(str, "%u", &cand->priority) != 1)
         ABORT(R_BAD_DATA);
     if (cand->priority < 1)
         ABORT(R_BAD_DATA);
     skip_to_past_space(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* Peer address/port */
     if ((r=grab_token(&str, &connection_address)))
         ABORT(r);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     addr = inet_addr(connection_address);
     if (addr == INADDR_NONE)
         ABORT(R_BAD_DATA);
     skip_whitespace(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     if (sscanf(str, "%u", &port) != 1)
         ABORT(R_BAD_DATA);
     if (port < 1 || port > 0x0FFFF)
         ABORT(R_BAD_DATA);
     /* Assume v4 for now */
     if(r=nr_ip4_port_to_transport_addr(ntohl(addr),port,IPPROTO_UDP,&cand->addr))
       ABORT(r);
     skip_to_past_space(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     /* Type */
     if (strncasecmp("typ", str, 3))
         ABORT(R_BAD_DATA);
     fast_forward(&str, 3);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     skip_whitespace(&str);
     if (*str == '\0')
         ABORT(R_BAD_DATA);
     assert(nr_ice_candidate_type_names[0] == 0);
 #if __STDC_VERSION__ >= 201112L
     _Static_assert(nr_ice_candidate_type_names[0] == 0,"Candidate name array is misformatted");
 #endif
     for (i = 1; nr_ice_candidate_type_names[i]; ++i) {
         if(!strncasecmp(nr_ice_candidate_type_names[i], str, strlen(nr_ice_candidate_type_names[i]))) {
             cand->type=i;
             break;
         }
     }
     if (nr_ice_candidate_type_names[i] == 0)
         ABORT(R_BAD_DATA);
     fast_forward(&str, strlen(nr_ice_candidate_type_names[i]));
     /* Look for the other side's raddr, rport */
     /* raddr, rport */
     switch (cand->type) {
     case HOST:
         break;
     case SERVER_REFLEXIVE:
     case PEER_REFLEXIVE:
     case RELAYED:
         skip_whitespace(&str);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         if (strncasecmp("raddr", str, 5))
             ABORT(R_BAD_DATA);
         fast_forward(&str, 5);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         skip_whitespace(&str);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         if ((r=grab_token(&str, &rel_addr)))
             ABORT(r);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         addr = inet_addr(rel_addr);
         if (addr == INADDR_NONE)
             ABORT(R_BAD_DATA);
         skip_whitespace(&str);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         if (strncasecmp("rport", str, 5))
               ABORT(R_BAD_DATA);
         fast_forward(&str, 5);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         skip_whitespace(&str);
         if (*str == '\0')
             ABORT(R_BAD_DATA);
         if (sscanf(str, "%u", &port) != 1)
             ABORT(R_BAD_DATA);
         if (port < 1 || port > 0x0FFFF)
             ABORT(R_BAD_DATA);
         /* Assume v4 for now */
         if(r=nr_ip4_port_to_transport_addr(ntohl(addr),port,IPPROTO_UDP,&cand->base))
           ABORT(r);
         skip_to_past_space(&str);
         /* it's expected to be at EOD at this point */
         break;
     default:
         ABORT(R_INTERNAL);
         break;
     }
     skip_whitespace(&str);
     /* Ignore extensions per RFC 5245 S 15.1 */
 #if 0
     /* This used to be an assert, but we don't want to exit on invalid
        remote data */
     if (strlen(str) != 0) {
       ABORT(R_BAD_DATA);
     }
 #endif
     nr_ice_candidate_compute_codeword(cand);
     *candp=cand;
     _status=0;
   abort:
     if (_status){
         r_log(LOG_ICE,LOG_WARNING,"ICE(%s): Error parsing attribute: %s",ctx->label,orig);
         nr_ice_candidate_destroy(&cand);
     }
     RFREE(connection_address);
     RFREE(rel_addr);
     return(_status);
 }
 int
 nr_ice_peer_ctx_parse_media_stream_attribute(nr_ice_peer_ctx *pctx, nr_ice_media_stream *stream, char *attr)
 {
     int r,_status;
     char *orig = 0;
     char *str;
     orig = str = attr;
     if (!strncasecmp(str, "ice-ufrag:", 10)) {
       fast_forward(&str, 10);
       if (*str == '\0')
         ABORT(R_BAD_DATA);
       skip_whitespace(&str);
       if (*str == '\0')
         ABORT(R_BAD_DATA);
       if ((r=grab_token(&str, &stream->ufrag)))
         ABORT(r);
     }
     else if (!strncasecmp(str, "ice-pwd:", 8)) {
       fast_forward(&str, 8);
       if (*str == '\0')
         ABORT(R_BAD_DATA);
       skip_whitespace(&str);
       if (*str == '\0')
         ABORT(R_BAD_DATA);
       if ((r=grab_token(&str, &stream->pwd)))
         ABORT(r);
     }
     else {
       ABORT(R_BAD_DATA);
     }
     skip_whitespace(&str);
     /* RFC 5245 grammar doesn't have an extension point for ice-pwd or
        ice-ufrag: if there's anything left on the line, we treat it as bad. */
     if (str[0] != '\0') {
       ABORT(R_BAD_DATA);
     }
     _status=0;
   abort:
     if (_status) {
       if (orig)
         r_log(LOG_ICE,LOG_WARNING,"ICE-PEER(%s): Error parsing attribute: %s",pctx->label,orig);
     }
     return(_status);
 }
 int
 nr_ice_peer_ctx_parse_global_attributes(nr_ice_peer_ctx *pctx, char **attrs, int attr_ct)
 {
     int r,_status;
     int i;
     char *orig = 0;
     char *str;
     char *component_id = 0;
     char *connection_address = 0;
     unsigned int port;
     in_addr_t addr;
     char *ice_option_tag = 0;
     for(i=0;i<attr_ct;i++){
         orig = str = attrs[i];
         component_id = 0;
         connection_address = 0;
         ice_option_tag = 0;
         if (!strncasecmp(str, "remote-candidates:", 18)) {
             fast_forward(&str, 18);
             skip_whitespace(&str);
             while (*str != '\0') {
                 if ((r=grab_token(&str, &component_id)))
                     ABORT(r);
                 if (*str == '\0')
                     ABORT(R_BAD_DATA);
                 skip_whitespace(&str);
                 if (*str == '\0')
                     ABORT(R_BAD_DATA);
                 if ((r=grab_token(&str, &connection_address)))
                     ABORT(r);
                 if (*str == '\0')
                     ABORT(R_BAD_DATA);
                 addr = inet_addr(connection_address);
                 if (addr == INADDR_NONE)
                     ABORT(R_BAD_DATA);
                 skip_whitespace(&str);
                 if (*str == '\0')
                     ABORT(R_BAD_DATA);
                 if (sscanf(str, "%u", &port) != 1)
                     ABORT(R_BAD_DATA);
                 if (port < 1 || port > 0x0FFFF)
                     ABORT(R_BAD_DATA);
                 skip_to_past_space(&str);
 #if 0
                 /* TODO: !nn! just drop on the floor for now, later put somewhere */
                 /* Assume v4 for now */
                 if(r=nr_ip4_port_to_transport_addr(ntohl(addr),port,IPPROTO_UDP,&candidate->base))
                   ABORT(r);
                 TAILQ_INSERT_TAIL(head, elm, field);
 #endif
                 component_id = 0;  /* prevent free */
                 RFREE(connection_address);
                 connection_address = 0;  /* prevent free */
             }
         }
         else if (!strncasecmp(str, "ice-lite", 8)) {
             pctx->peer_lite = 1;
             fast_forward(&str, 8);
         }
         else if (!strncasecmp(str, "ice-mismatch", 12)) {
             pctx->peer_ice_mismatch = 1;
             fast_forward(&str, 12);
         }
         else if (!strncasecmp(str, "ice-ufrag:", 10)) {
             fast_forward(&str, 10);
             if (*str == '\0')
                 ABORT(R_BAD_DATA);
             skip_whitespace(&str);
             if (*str == '\0')
                 ABORT(R_BAD_DATA);
             RFREE(pctx->peer_ufrag);
             pctx->peer_ufrag = 0;
             if ((r=grab_token(&str, &pctx->peer_ufrag)))
                 ABORT(r);
         }
         else if (!strncasecmp(str, "ice-pwd:", 8)) {
             fast_forward(&str, 8);
             if (*str == '\0')
                 ABORT(R_BAD_DATA);
             skip_whitespace(&str);
             if (*str == '\0')
                 ABORT(R_BAD_DATA);
             RFREE(pctx->peer_pwd);
             pctx->peer_pwd = 0;
             if ((r=grab_token(&str, &pctx->peer_pwd)))
                 ABORT(r);
         }
         else if (!strncasecmp(str, "ice-options:", 12)) {
             fast_forward(&str, 12);
             skip_whitespace(&str);
             while (*str != '\0') {
                 if ((r=grab_token(&str, &ice_option_tag)))
                     ABORT(r);
                 skip_whitespace(&str);
                 //TODO: for now, just throw away; later put somewhere
                 RFREE(ice_option_tag);
                 ice_option_tag = 0;  /* prevent free */
             }
         }
         else {
             ABORT(R_BAD_DATA);
         }
         skip_whitespace(&str);
       /* RFC 5245 grammar doesn't have an extension point for any of the
          preceding attributes: if there's anything left on the line, we
          treat it as bad data. */
       if (str[0] != '\0') {
         ABORT(R_BAD_DATA);
       }
     }
     _status=0;
   abort:
     if (_status) {
       if (orig)
         r_log(LOG_ICE,LOG_WARNING,"ICE-PEER(%s): Error parsing attribute: %s",pctx->label,orig);
     }
     RFREE(connection_address);
     RFREE(component_id);
     RFREE(ice_option_tag);
     return(_status);
 }

The Tor Browser / annotate

media/mtransport/third_party/nICEr/src/ice/ice_parser.c@6474c204b198 (annotated)

media/mtransport/third_party/nICEr/src/ice/ice_parser.c