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Version 1.2p1

    1: /*
    2:  *  $Id: udp1.c,v 1.1.1.3 2023/09/27 11:11:38 misho Exp $
    3:  *
    4:  *  libnet 1.1
    5:  *  Build a UDP packet
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  *
   31:  */
   32: 
   33: #include "./libnet_test.h"
   34: 
   35: int
   36: main(int argc, char *argv[])
   37: {
   38:     int c, i, j, build_ip;
   39:     char *cp;
   40:     libnet_t *l;
   41:     libnet_ptag_t ip, ipo;
   42:     libnet_ptag_t udp;
   43:     char *payload;
   44:     u_short payload_s;
   45:     struct libnet_stats ls;
   46:     u_long src_ip, dst_ip;
   47:     u_short src_prt, dst_prt;
   48:     u_char opt[20];
   49:     char errbuf[LIBNET_ERRBUF_SIZE];
   50: 
   51:     printf("libnet 1.1 packet shaping: UDP + IP options[raw]\n"); 
   52: 
   53:     /*
   54:      *  Initialize the library.  Root priviledges are required.
   55:      */
   56:     l = libnet_init(
   57:             LIBNET_RAW4,                            /* injection type */
   58:             NULL,                                   /* network interface */
   59:             errbuf);                                /* errbuf */
   60: 
   61:     if (l == NULL)
   62:     {
   63:         fprintf(stderr, "libnet_init() failed: %s\n", 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:     ip = ipo = udp = 0;
   74:     while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
   75:     {
   76:         switch (c)
   77:         {
   78:             /*
   79:              *  We expect the input to be of the form `ip.ip.ip.ip.port`.  We
   80:              *  point cp to the last dot of the IP address/port string and
   81:              *  then seperate them with a NULL byte.  The optarg now points to
   82:              *  just the IP address, and cp points to the port.
   83:              */
   84:             case 'd':
   85:                 if (!(cp = strrchr(optarg, '.')))
   86:                 {
   87:                     usage(argv[0]);
   88:                 }
   89:                 *cp++ = 0;
   90:                 dst_prt = (u_short)atoi(cp);
   91:                 if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
   92:                 {
   93:                     fprintf(stderr, "Bad destination IP address: %s\n", optarg);                    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:     for (build_ip = 0, i = 0; i < 10; i++)
  125:     {
  126:         udp = libnet_build_udp(
  127:             src_prt,                                /* source port */
  128:             dst_prt + i,                            /* destination port */
  129:             LIBNET_UDP_H + payload_s,               /* packet length */
  130:             0,                                      /* checksum */
  131:             (uint8_t*)payload,                     /* payload */
  132:             payload_s,                              /* payload size */
  133:             l,                                      /* libnet handle */
  134:             udp);                                   /* libnet id */
  135:         if (udp == -1)
  136:         {
  137:             fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
  138:             goto bad;
  139:         }
  140: 
  141:         if (1)
  142:         {
  143:             build_ip = 0;
  144:             /* this is not a legal options string */
  145:             for (j = 0; j < 20; j++)
  146:             {
  147:                 opt[j] = libnet_get_prand(LIBNET_PR2);
  148:             }
  149:             ipo = libnet_build_ipv4_options(
  150:                 opt,
  151:                 20,
  152:                 l,
  153:                 ipo);
  154:             if (ipo == -1)
  155:             {
  156:                 fprintf(stderr, "Can't build IP options: %s\n", libnet_geterror(l));
  157:                 goto bad;
  158:             }
  159: 
  160:             ip = libnet_build_ipv4(
  161:                 LIBNET_IPV4_H + 20 + payload_s + LIBNET_UDP_H, /* length */
  162:                 0,                                          /* TOS */
  163:                 242,                                        /* IP ID */
  164:                 0,                                          /* IP Frag */
  165:                 64,                                         /* TTL */
  166:                 IPPROTO_UDP,                                /* protocol */
  167:                 0,                                          /* checksum */
  168:                 src_ip,
  169:                 dst_ip,
  170:                 NULL,                                       /* payload */
  171:                 0,                                          /* payload size */
  172:                 l,                                          /* libnet handle */
  173:                ip);                                         /* libnet id */
  174:             if (ip == -1)
  175:             {
  176:                 fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
  177:                 goto bad;
  178:             }
  179:         }
  180: 
  181:         /*
  182:          *  Write it to the wire.
  183:          */
  184:         fprintf(stderr, "%d byte packet, ready to go\n",
  185:             libnet_getpacket_size(l));
  186:         c = libnet_write(l);
  187:         if (c == -1)
  188:         {
  189:             fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
  190:             goto bad;
  191:         }
  192:         else
  193:         {
  194:             fprintf(stderr, "Wrote %d byte UDP packet; check the wire.\n", c);
  195:         }
  196:     }
  197:     libnet_stats(l, &ls);
  198:     fprintf(stderr, "Packets sent:  %lld\n"
  199:                     "Packet errors: %lld\n"
  200:                     "Bytes written: %lld\n",
  201:                     (long long)ls.packets_sent, (long long)ls.packet_errors,
  202: 		    (long long)ls.bytes_written);
  203:     libnet_destroy(l);
  204:     return (EXIT_SUCCESS);
  205: bad:
  206:     libnet_destroy(l);
  207:     return (EXIT_FAILURE);
  208: }
  209: 
  210: void
  211: usage(char *name)
  212: {
  213:     fprintf(stderr,
  214:         "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
  215:         " [-p payload]\n",
  216:         name);
  217: }