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Annotation of embedaddon/libnet/sample/test_ipv4.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Regression test for bugs in ipv4 ip_offset and h_len handling, such as
                      3:  *   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=418975
                      4:  *
                      5:  * Copyright (c) 2009 Sam Roberts <sroberts@wurldtech.com>
                      6:  * All rights reserved.
                      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:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  *
                     29:  */
                     30: #if (HAVE_CONFIG_H)
                     31: #include "../include/config.h"
                     32: #endif
                     33: #include "./libnet_test.h"
                     34: 
                     35: #include <assert.h>
                     36: 
                     37: static void print_pblocks(libnet_t* l)
                     38: {
                     39:     libnet_pblock_t* p = l->protocol_blocks;
                     40: 
                     41:     while(p) {
                     42:         /* h_len is header length for checksumming? "chksum length"? */
                     43:         printf("  tag %d flags %d type %20s/%#x buf %p b_len %2u h_len %2u copied %2u\n",
                     44:                 p->ptag, p->flags,
                     45:                 libnet_diag_dump_pblock_type(p->type), p->type,
                     46:                 p->buf, p->b_len, p->h_len, p->copied);
                     47:         p = p->next;
                     48:     }
                     49:     printf("  link_offset %d aligner %d total_size %u nblocks %d\n",
                     50:             l->link_offset, l->aligner, l->total_size, l->n_pblocks);
                     51: 
                     52: }
                     53: 
                     54: static int build_ipv4(libnet_t* l, libnet_ptag_t ip_ptag, int payload_s)
                     55: {
                     56:     u_long src_ip = 0xf101f1f1;
                     57:     u_long dst_ip = 0xf102f1f1;
                     58:     uint8_t* payload = malloc(payload_s);
                     59:     assert(payload);
                     60:     memset(payload, '\x00', payload_s);
                     61: 
                     62:     ip_ptag = libnet_build_ipv4(
                     63:         LIBNET_IPV4_H + payload_s,                  /* length */
                     64:         0,                                          /* TOS */
                     65:         0xbbbb,                                     /* IP ID */
                     66:         0,                                          /* IP Frag */
                     67:         0xcc,                                      /* TTL */
                     68:         IPPROTO_UDP,                                /* protocol */
                     69:         0,                                          /* checksum */
                     70:         src_ip,                                     /* source IP */
                     71:         dst_ip,                                     /* destination IP */
                     72:         payload,                                    /* payload */
                     73:         payload_s,                                  /* payload size */
                     74:         l,                                          /* libnet handle */
                     75:         ip_ptag);                                   /* libnet id */
                     76: 
                     77:     assert(ip_ptag > 0);
                     78: 
                     79:     free(payload);
                     80: 
                     81:     return ip_ptag;
                     82: }
                     83: 
                     84: int
                     85: main(int argc, char *argv[])
                     86: {
                     87:     libnet_t *l;
                     88:     int r;
                     89:     char *device = "eth0";
                     90:     uint8_t enet_src[6] = {0x11, 0x11, 0x11, 0x11, 0x11, 0x11};
                     91:     uint8_t enet_dst[6] = {0x22, 0x22, 0x22, 0x22, 0x22, 0x22};
                     92:     char errbuf[LIBNET_ERRBUF_SIZE];
                     93:     libnet_ptag_t ip_ptag = 0;
                     94:     libnet_ptag_t eth_ptag = 0;
                     95:     int pkt1_payload = 10;
                     96:     uint8_t* pkt1 = NULL;
                     97:     uint32_t pkt1_sz = 0;
                     98:     struct libnet_ipv4_hdr* h1;
                     99:     int pkt2_payload = 2;
                    100:     uint8_t* pkt2 = NULL;
                    101:     uint32_t pkt2_sz = 0;
                    102:     struct libnet_ipv4_hdr* h2;
                    103: 
                    104: 
                    105: 
                    106:     l = libnet_init( LIBNET_LINK, device, errbuf);
                    107: 
                    108:     assert(l);
                    109: 
                    110:     /* Bug is triggered when rebuilding the ipv4 blocks with smaller payload.
                    111:      * If change in payload size is larger than 20 (iph) + 14 (ether) +
                    112:      * aligner, it will cause checksum to be written into the unallocated
                    113:      * memory before the packet, possibly corrupting glib's memory allocation
                    114:      * structures.
                    115:      */
                    116: 
                    117:     printf("Packet 1:\n");
                    118: 
                    119:     ip_ptag = build_ipv4(l, ip_ptag, pkt1_payload);
                    120: 
                    121:     eth_ptag = libnet_build_ethernet(
                    122:         enet_dst,                                      /* ethernet destination */
                    123:         enet_src,                                      /* ethernet source */
                    124:         ETHERTYPE_IP,                               /* protocol type */
                    125:         NULL,                                       /* payload */
                    126:         0,                                          /* payload size */
                    127:         l,                                          /* libnet handle */
                    128:         0);                                         /* libnet id */
                    129:     assert(eth_ptag > 0);
                    130: 
                    131:     r = libnet_pblock_coalesce(l, &pkt1, &pkt1_sz);
                    132:     assert(r >= 0);
                    133: 
                    134:     print_pblocks(l);
                    135: 
                    136:     libnet_diag_dump_hex(pkt1, 14, 0, stdout);
                    137:     libnet_diag_dump_hex(pkt1+14, pkt1_sz-14, 0, stdout);
                    138: 
                    139:     printf("Packet 2:\n");
                    140: 
                    141:     ip_ptag = build_ipv4(l, ip_ptag, pkt2_payload);
                    142: 
                    143:     r = libnet_pblock_coalesce(l, &pkt2, &pkt2_sz);
                    144:     assert(r >= 0);
                    145: 
                    146:     print_pblocks(l);
                    147: 
                    148:     libnet_diag_dump_hex(pkt2, 14, 0, stdout);
                    149:     libnet_diag_dump_hex(pkt2+14, pkt2_sz-14, 0, stdout);
                    150: 
                    151:     /* Packets should differ only in the total length and cksum. */
                    152:     h1 = (struct libnet_ipv4_hdr*) (pkt1+14);
                    153:     h2 = (struct libnet_ipv4_hdr*) (pkt2+14);
                    154: 
                    155:     assert(h1->ip_len == htons(20+pkt1_payload));
                    156:     assert(h2->ip_len == htons(20+pkt2_payload));
                    157: 
                    158:     h1->ip_len = h2->ip_len = 0x5555;
                    159:     h1->ip_sum = h2->ip_sum = 0x6666;
                    160: 
                    161:     assert(memcmp(pkt1, pkt2, 14 + 20) == 0);
                    162: 
                    163:     return (EXIT_SUCCESS);
                    164: }
                    165: