sip.c

radius协议源码÷The Radius Stack will connect to a Radius Server. This stack implementation is built upo

/**************************************************************************** 
** File: sip.c
**
** Author: Mike Borella
**
** Comments: Dump SIP header information. I didn't try to do anything
** fancy with this - I just dump the plaintext headers.  This makes 
** debugging easier since parsing is such a pain to get right.
**
*****************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "config.h"
#include "ip.h"
#include "udp.h"

#define LINE_SIZE 256
#define FALSE 0
#define TRUE  1

extern u_char *packet_end;
extern struct arg_t *my_args;

/*----------------------------------------------------------------------------
**
** dump_sip()
**
** Parse SIP packet and dump fields.  This code is kludgy - I'll fix it later
**
**----------------------------------------------------------------------------
*/

void dump_sip(u_char *bp, int length)
{
  u_char *ep = bp + length;
  u_char *p;
  u_char *ptr;
  char line[LINE_SIZE];
  int use_sdp = FALSE;
  int i;
  int n = 0;
  int get_next_line(u_char *, u_char *, char *);
  void dump_sdp(u_char *, int);
  int firstLine;

  /*
   * Make sure we don't run off the end of the packet
   */

  if (ep > packet_end) 
    ep = packet_end;

  p = bp;

  if (!my_args->m)
    {
      printf("-----------------------------------------------------------------\n");
      printf("                        SIP Headers\n");
      printf("-----------------------------------------------------------------\n");
    }

  firstLine = 1;
  while(p <= ep && (n = get_next_line(p, ep, line)))
    {
      p = p + n;
      length = length - n;

      if ( firstLine )
	{
	  firstLine = 0;
	  if ( !strncmp(line,"SIP",3) )
	    {
	      printf("sip-res:    %-45s [%s:%d->%s:%d]\n", 
		     line,
		     current_ip_src_addr,
		     current_ip_src_port,
		     current_ip_dst_addr,
		     current_ip_dst_port);
	    }
	  else
	    {
	      printf("sip-req:    %-45s [%s:%d->%s:%d]\n", 
		     line,
		     current_ip_src_addr,
		     current_ip_src_port,
		     current_ip_dst_addr,
		     current_ip_dst_port);
	    }
	}
      else
	{
	  if (!my_args->m)
	    {
	      printf("Header:                 %s\n", line);
	    }
	}

      for (i=0; i<strlen(line); i++)
	line[i] = tolower(line[i]);

      if (!my_args->m)
	{    
	  if (!strncmp("content-type", line, 12))
	    {
	      ptr = &line[14];
	      while(isspace(*ptr)) 
		ptr++;
	      
	      if (!strncmp("application/sdp", ptr, 15))
		use_sdp = TRUE;
	    }
	}
    }
  
  p = p + 2;

  if (use_sdp)
    dump_sdp(p, length);
}

#define hashfn(x) \
    ((int)((((int)x[0]) << 8) | ((int)x[1])))

#define mkhash(x,y) \
    ((((int)(x)) << 8) | ((int)(y)))

int is_sip(u_char *bp)
{
    /* calculate a hash to find out if it's right */

    switch(hashfn(bp))
    {
	case mkhash('I','N'):
	case mkhash('A','C'):
	case mkhash('O','P'):
	case mkhash('B','Y'):
	case mkhash('R','E'):
	case mkhash('C','A'):
	case mkhash('S','I'):
	    return 1;
	default:
	    return 0;
    }
}