Annotation of embedaddon/libnet/sample/hsrp.c, revision 1.1
1.1 ! misho 1: /*
! 2: *
! 3: * libnet 1.1.2
! 4: * Build a HSRP packet
! 5: *
! 6: * Copyright (c) 2004 David Barroso Berrueta <tomac@wasahero.org>
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: *
! 18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 21: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 28: * SUCH DAMAGE.
! 29: *
! 30: */
! 31:
! 32: #if (HAVE_CONFIG_H)
! 33: #if ((_WIN32) && !(__CYGWIN__))
! 34: #include "../include/win32/config.h"
! 35: #else
! 36: #include "../include/config.h"
! 37: #endif
! 38: #endif
! 39: #include "./libnet_test.h"
! 40:
! 41:
! 42: int
! 43: main(int argc, char *argv[])
! 44: {
! 45: uint8_t version = LIBNET_HSRP_VERSION;
! 46: uint8_t opcode = LIBNET_HSRP_TYPE_HELLO;
! 47: uint8_t state = LIBNET_HSRP_STATE_ACTIVE;
! 48: uint8_t hello_time = 3;
! 49: uint8_t hold_time = 10;
! 50: uint8_t priority = 1;
! 51: uint8_t group = 1;
! 52: uint8_t reserved = 0;
! 53: uint8_t authdata[8];
! 54:
! 55: libnet_t *l;
! 56: char *device = NULL;
! 57: char src[] = "1.1.1.1";
! 58: char *eth_dst = "DE:AD:00:00:BE:EF";
! 59: char dst[] = "224.0.0.2";
! 60: int port = 1985;
! 61: int c;
! 62: u_long src_ip, dst_ip;
! 63: char errbuf[LIBNET_ERRBUF_SIZE];
! 64: libnet_ptag_t ptag = 0;
! 65:
! 66: printf("libnet 1.1.2 packet shaping: HSRP[link]\n");
! 67:
! 68: /*
! 69: * Initialize the library. Root priviledges are required.
! 70: */
! 71: l = libnet_init(
! 72: LIBNET_LINK_ADV, /* injection type */
! 73: device, /* network interface */
! 74: errbuf); /* error buffer */
! 75:
! 76: if (l == NULL)
! 77: {
! 78: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 79: exit(EXIT_FAILURE);
! 80: }
! 81:
! 82: printf("Using device %s\n", l->device);
! 83:
! 84: if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == (u_long)-1)
! 85: {
! 86: fprintf(stderr, "Bad destination IP address: %s\n", dst);
! 87: exit(EXIT_FAILURE);
! 88: }
! 89:
! 90: if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == (u_long)-1)
! 91: {
! 92: fprintf(stderr, "Bad source IP address: %s\n", src);
! 93: exit(EXIT_FAILURE);
! 94: }
! 95:
! 96: memset(authdata, 0, 8);
! 97: strncpy(authdata, "cisco", 5);
! 98:
! 99:
! 100: ptag = libnet_build_hsrp(
! 101: version,
! 102: opcode,
! 103: state,
! 104: hello_time, /* Recommended hello time */
! 105: hold_time, /* Recommended hold time */
! 106: priority, /* Priority */
! 107: group, /* Group */
! 108: reserved, /* Reserved */
! 109: authdata, /* Password */
! 110: src_ip, /* Virtual IP */
! 111: NULL,
! 112: 0,
! 113: l,
! 114: 0
! 115: );
! 116:
! 117: if (ptag == -1)
! 118: {
! 119: fprintf(stderr, "Can't build HSRP header: %s\n", libnet_geterror(l));
! 120: goto bad;
! 121: }
! 122:
! 123: ptag = libnet_build_udp(
! 124: port, /* source port */
! 125: port, /* destination port */
! 126: LIBNET_UDP_H + LIBNET_HSRP_H , /* packet length */
! 127: 0, /* checksum */
! 128: NULL, /* payload */
! 129: 0, /* payload size */
! 130: l, /* libnet handle */
! 131: 0); /* libnet id */
! 132:
! 133: if (ptag == -1)
! 134: {
! 135: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
! 136: goto bad;
! 137: }
! 138:
! 139: ptag = libnet_build_ipv4(
! 140: LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_HSRP_H,/* length */
! 141: 0, /* TOS */
! 142: 666, /* IP ID */
! 143: 0, /* IP Frag */
! 144: 1 , /* TTL */
! 145: IPPROTO_UDP, /* protocol */
! 146: 0, /* checksum */
! 147: src_ip, /* source IP */
! 148: dst_ip, /* destination IP */
! 149: NULL, /* payload */
! 150: 0, /* payload size */
! 151: l, /* libnet handle */
! 152: 0); /* libnet id */
! 153:
! 154: if (ptag == -1)
! 155: {
! 156: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 157: exit(EXIT_FAILURE);
! 158: }
! 159:
! 160:
! 161: eth_dst = libnet_hex_aton(eth_dst, &c);
! 162: ptag = libnet_autobuild_ethernet(
! 163: eth_dst, /* ethernet destination */
! 164: ETHERTYPE_IP, /* protocol type */
! 165: l); /* libnet handle */
! 166:
! 167: free(eth_dst);
! 168: if (ptag == -1)
! 169: {
! 170: fprintf(stderr, "Can't build ethernet header: %s\n",
! 171: libnet_geterror(l));
! 172: goto bad;
! 173: }
! 174:
! 175:
! 176: /*
! 177: * write to the wire
! 178: */
! 179: c = libnet_write(l);
! 180: if (c == -1)
! 181: {
! 182: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 183: goto bad;
! 184: }
! 185: else
! 186: {
! 187: fprintf(stderr, "Wrote %d byte HSRP packet; check the wire.\n", c);
! 188: }
! 189: libnet_destroy(l);
! 190: return (EXIT_SUCCESS);
! 191: bad:
! 192: libnet_destroy(l);
! 193: return (EXIT_FAILURE);
! 194:
! 195: return 0;
! 196: }
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