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