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Last updated: Sat Feb 3 05:00:56 2007

Asterisk developer's documentation :: Codename Pineapple

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sip3_callerid.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2007, Digium, Inc.
 * and Edvina AB, Sollentuna, Sweden (chan_sip3 changes/additions)
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief Various SIP callerid functions
 * Version 3 of chan_sip
 *
 * \author Mark Spencer <markster@digium.com>
 * \author Olle E. Johansson <oej@edvina.net> (all the chan_sip3 changes)
 *
 * See Also:
 * \arg \ref AstCREDITS
 *
 */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 53128 $")

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <regex.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/rtp.h"
#include "asterisk/udptl.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/app.h"
#include "asterisk/astdb.h"
#include "asterisk/causes.h"
#include "asterisk/utils.h"
#include "asterisk/file.h"
#include "asterisk/astobj.h"
#include "asterisk/dnsmgr.h"
#include "asterisk/linkedlists.h"
#include "asterisk/manager.h"
#include "asterisk/monitor.h"
#include "asterisk/localtime.h"
#include "asterisk/compiler.h"
#include "sip3.h"
#include "sip3funcs.h"

/*! \brief helper function for check_{user|peer}_ok() */
void replace_cid(struct sip_dialog *p, const char *rpid_num, const char *calleridname)
{
   /* replace callerid if rpid found, and not restricted */
   if (!ast_strlen_zero(rpid_num) && ast_test_flag(&p->flags[0], SIP_TRUSTRPID)) {
      char *tmp = ast_strdupa(rpid_num); /* XXX the copy can be done later */
      if (!ast_strlen_zero(calleridname))
         ast_string_field_set(p, cid_name, calleridname);
      if (ast_is_shrinkable_phonenumber(tmp))
         ast_shrink_phone_number(tmp);
      ast_string_field_set(p, cid_num, tmp);
   }
}

/*! \brief  Get caller id number from Remote-Party-ID header field 
 * Returns true if number should be restricted (privacy setting found)
 * output is set to NULL if no number found
 */
int get_rpid_num(const char *input, char *output, int maxlen)
{
   char *start;
   char *end;

   start = strchr(input,':');
   if (!start) {
      output[0] = '\0';
      return 0;
   }
   start++;

   /* we found "number" */
   ast_copy_string(output,start,maxlen);
   output[maxlen-1] = '\0';

   end = strchr(output,'@');
   if (end)
      *end = '\0';
   else
      output[0] = '\0';
   if (strstr(input,"privacy=full") || strstr(input,"privacy=uri"))
      return AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;

   return 0;
}

/*! \brief  Get caller id name from SIP headers */
char *get_calleridname(const char *input, char *output, size_t outputsize)
{
   const char *end = strchr(input,'<');   /* first_bracket */
   const char *tmp = strchr(input,'"');   /* first quote */
   int bytes = 0;
   int maxbytes = outputsize - 1;

   if (!end || end == input)  /* we require a part in brackets */
      return NULL;

   /* move away from "<" */
   end--;

   /* we found "name" */
   if (tmp && tmp < end) {
      end = strchr(tmp+1, '"');
      if (!end)
         return NULL;
      bytes = (int) (end - tmp);
      /* protect the output buffer */
      if (bytes > maxbytes)
         bytes = maxbytes;
      ast_copy_string(output, tmp + 1, bytes);
   } else {
      /* we didn't find "name" */
      /* clear the empty characters in the begining*/
      input = ast_skip_blanks(input);
      /* clear the empty characters in the end */
      while(*end && *end < 33 && end > input)
         end--;
      if (end >= input) {
         bytes = (int) (end - input) + 2;
         /* protect the output buffer */
         if (bytes > maxbytes)
            bytes = maxbytes;
         ast_copy_string(output, input, bytes);
      } else
         return NULL;
   }
   return output;
}

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