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Annotation of embedaddon/hping2/display_ipopt.c, revision 1.1

1.1     ! misho       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: }