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hping2

    1: /*
    2:  * Copyright (c) 1989 The Regents of the University of California.
    3:  * All rights reserved.
    4:  *
    5:  * This code is derived from software contributed to Berkeley by
    6:  * Mike Muuss.
    7:  *
    8:  * Redistribution and use in source and binary forms, with or without
    9:  * modification, are permitted provided that the following conditions
   10:  * are met:
   11:  * 1. Redistributions of source code must retain the above copyright
   12:  *    notice, this list of conditions and the following disclaimer.
   13:  * 2. Redistributions in binary form must reproduce the above copyright
   14:  *    notice, this list of conditions and the following disclaimer in the
   15:  *    documentation and/or other materials provided with the distribution.
   16:  * 3. All advertising materials mentioning features or use of this software
   17:  *    must display the following acknowledgement:
   18:  *      This product includes software developed by the University of
   19:  *      California, Berkeley and its contributors.
   20:  * 4. Neither the name of the University nor the names of its contributors
   21:  *    may be used to endorse or promote products derived from this software
   22:  *    without specific prior written permission.
   23:  *
   24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34:  * SUCH DAMAGE.
   35:  */
   36: 
   37: #include <stdio.h>
   38: #include <string.h>
   39: #include <sys/types.h>
   40: #include <sys/socket.h>
   41: #include <netinet/in.h>
   42: #include <arpa/inet.h>
   43: 
   44: #include "hping2.h"
   45: #include "globals.h"
   46: 
   47: /* ripped from ping */
   48: 
   49: void display_ipopt(char* buf)
   50: {
   51: int i,j;
   52: unsigned long l;
   53: static int old_rrlen;
   54: static char old_rr[MAX_IPOPTLEN];
   55: unsigned char* cp;
   56: int hlen;
   57: struct myiphdr *ip;
   58: struct in_addr in;
   59: 
   60: 
   61: 	ip = (struct myiphdr *)buf;
   62: 	hlen = ip->ihl * 4;
   63: 	
   64: 	cp = (u_char *)buf + sizeof(struct myiphdr);
   65: 
   66: 	for (; hlen > (int)sizeof(struct myiphdr); --hlen, ++cp)
   67: 		switch (*cp) {
   68: 		case IPOPT_EOL:
   69: 			hlen = 0;
   70: 			break;
   71: 		case IPOPT_LSRR:
   72: 			(void)printf("LSRR: ");
   73: 			hlen -= 2;
   74: 			j = *++cp;
   75: 			++cp;
   76: 			if (j > IPOPT_MINOFF)
   77: 				for (;;) {
   78: 					l = *++cp;
   79: 					l = (l<<8) + *++cp;
   80: 					l = (l<<8) + *++cp;
   81: 					l = (l<<8) + *++cp;
   82: 				in.s_addr=htonl(l);
   83: 				printf("\t%s",inet_ntoa(in));
   84: 				hlen -= 4;
   85: 				j -= 4;
   86: 				if (j <= IPOPT_MINOFF)
   87: 					break;
   88: 				(void)putchar('\n');
   89: 			}
   90: 			break;
   91: 		case IPOPT_RR:
   92: 			j = *++cp;		/* get length */
   93: 			i = *++cp;		/* and pointer */
   94: 			hlen -= 2;
   95: 			if (i > j)
   96: 				i = j;
   97: 			i -= IPOPT_MINOFF;
   98: 			if (i <= 0)
   99: 				continue;
  100: 			if (i == old_rrlen
  101: 			    && cp == (u_char *)buf + sizeof(struct myiphdr) + 2
  102: 			    && !memcmp((char *)cp, old_rr, i)) {
  103: 				(void)printf("\t(same route)\n");
  104: 				i = ((i + 3) / 4) * 4;
  105: 				hlen -= i;
  106: 				cp += i;
  107: 				break;
  108: 			}
  109: 			old_rrlen = i;
  110: 			memcpy(old_rr, cp, i);
  111: 			(void)printf("RR: ");
  112: 			for (;;) {
  113: 				l = *++cp;
  114: 				l = (l<<8) + *++cp;
  115: 				l = (l<<8) + *++cp;
  116: 				l = (l<<8) + *++cp;
  117: 				in.s_addr=htonl(l);
  118: 				printf("\t%s",inet_ntoa(in));
  119: 				hlen -= 4;
  120: 				i -= 4;
  121: 				if (i <= 0)
  122: 					break;
  123: 				(void)putchar('\n');
  124: 			}
  125: 			putchar('\n');
  126: 			
  127: 			break;
  128: 		case IPOPT_NOP:
  129: 			(void)printf("NOP\n");
  130: 			break;
  131: 		default:
  132: 			(void)printf("unknown option %x\n", *cp);
  133: 			break;
  134: 		}
  135: 
  136: }