Annotation of embedaddon/libnet/sample/fddi_tcp2.c, revision 1.1
1.1 ! misho 1: /*
! 2: * libnet 1.1
! 3: * Build a TCP packet to ride on FDDI (autobuild)
! 4: *
! 5: * Copyright (c) 1998 - 2001 Mike D. Schiffman <mike@infonexus.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:
! 31: #if (HAVE_CONFIG_H)
! 32: #include "../include/config.h"
! 33: #endif
! 34: #include "./libnet_test.h"
! 35:
! 36: int
! 37: main(int argc, char *argv[])
! 38: {
! 39: int c;
! 40: u_char *cp;
! 41: libnet_t *l;
! 42: libnet_ptag_t t;
! 43: char *payload;
! 44: u_short payload_s;
! 45: u_long src_ip, dst_ip;
! 46: u_short src_prt, dst_prt;
! 47: char errbuf[LIBNET_ERRBUF_SIZE];
! 48:
! 49: printf("libnet 1.1 packet shaping: TCP (over FDDI) [link]\n");
! 50:
! 51: /*
! 52: * Initialize the library. Root priviledges are required.
! 53: *
! 54: * Currently hardcoded for fddi0.
! 55: */
! 56: l = libnet_init(
! 57: LIBNET_LINK, /* injection type */
! 58: "fddi0", /* network interface */
! 59: errbuf); /* error buffer */
! 60:
! 61: if (l == NULL)
! 62: {
! 63: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 64: exit(EXIT_FAILURE);
! 65: }
! 66:
! 67: src_ip = 0;
! 68: dst_ip = 0;
! 69: src_prt = 0;
! 70: dst_prt = 0;
! 71: payload = NULL;
! 72: payload_s = 0;
! 73: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
! 74: {
! 75: switch (c)
! 76: {
! 77: /*
! 78: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
! 79: * point cp to the last dot of the IP address/port string and
! 80: * then seperate them with a NULL byte. The optarg now points to
! 81: * just the IP address, and cp points to the port.
! 82: */
! 83: case 'd':
! 84: if (!(cp = strrchr(optarg, '.')))
! 85: {
! 86: usage(argv[0]);
! 87: }
! 88: *cp++ = 0;
! 89: dst_prt = (u_short)atoi(cp);
! 90: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 91: {
! 92: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
! 93: exit(EXIT_FAILURE);
! 94: }
! 95: break;
! 96: case 's':
! 97: if (!(cp = strrchr(optarg, '.')))
! 98: {
! 99: usage(argv[0]);
! 100: }
! 101: *cp++ = 0;
! 102: src_prt = (u_short)atoi(cp);
! 103: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 104: {
! 105: fprintf(stderr, "Bad source IP address: %s\n", optarg);
! 106: exit(EXIT_FAILURE);
! 107: }
! 108: break;
! 109: case 'p':
! 110: payload = optarg;
! 111: payload_s = strlen(payload);
! 112: break;
! 113: default:
! 114: exit(EXIT_FAILURE);
! 115: }
! 116: }
! 117:
! 118: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
! 119: {
! 120: usage(argv[0]);
! 121: exit(EXIT_FAILURE);
! 122: }
! 123:
! 124:
! 125: t = libnet_build_tcp(
! 126: src_prt, /* source port */
! 127: dst_prt, /* destination port */
! 128: 0x01010101, /* sequence number */
! 129: 0x02020202, /* acknowledgement num */
! 130: TH_SYN, /* control flags */
! 131: 32767, /* window size */
! 132: 0, /* checksum */
! 133: 0, /* urgent pointer */
! 134: LIBNET_TCP_H + payload_s, /* TCP packet size */
! 135: payload, /* payload */
! 136: payload_s, /* payload size */
! 137: l, /* libnet handle */
! 138: 0); /* libnet id */
! 139: if (t == -1)
! 140: {
! 141: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
! 142: goto bad;
! 143: }
! 144:
! 145: t = libnet_build_ipv4(
! 146: LIBNET_IPV4_H + LIBNET_TCP_H + payload_s, /* length */
! 147: 0, /* TOS */
! 148: 242, /* IP ID */
! 149: 0, /* IP Frag */
! 150: 64, /* TTL */
! 151: IPPROTO_TCP, /* protocol */
! 152: 0, /* checksum */
! 153: src_ip, /* source IP */
! 154: dst_ip, /* destination IP */
! 155: NULL, /* payload */
! 156: 0, /* payload size */
! 157: l, /* libnet handle */
! 158: 0); /* libnet id */
! 159: if (t == -1)
! 160: {
! 161: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 162: goto bad;
! 163: }
! 164:
! 165: t = libnet_autobuild_fddi(
! 166: LIBNET_FDDI_FC_REQD | 0x04, /* Asynch LLC - priority 4 */
! 167: fddi_dst, /* fddi destination */
! 168: LIBNET_SAP_SNAP, /* DSAP -> SNAP encap */
! 169: LIBNET_SAP_SNAP, /* SSAP -> SNAP encap */
! 170: 0x03, /* Unnumbered info/frame */
! 171: org_code, /* Organization Code */
! 172: FDDI_TYPE_IP, /* protocol type */
! 173: l); /* libnet handle */
! 174: if (t == -1)
! 175: {
! 176: fprintf(stderr, "Can't build fddi header: %s\n", libnet_geterror(l));
! 177: goto bad;
! 178: }
! 179:
! 180: /*
! 181: * Write it to the wire.
! 182: */
! 183: c = libnet_write(l);
! 184: if (c == -1)
! 185: {
! 186: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 187: goto bad;
! 188: }
! 189: else
! 190: {
! 191: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
! 192: }
! 193: libnet_destroy(l);
! 194: return (EXIT_SUCCESS);
! 195: bad:
! 196: libnet_destroy(l);
! 197: return (EXIT_FAILURE);
! 198: }
! 199:
! 200: void
! 201: usage(char *name)
! 202: {
! 203: fprintf(stderr,
! 204: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
! 205: " [-p payload]\n",
! 206: name);
! 207: }
! 208:
! 209: /* EOF */
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