diff options
Diffstat (limited to 'libnet/src/libnet_build_arp.c')
| -rw-r--r-- | libnet/src/libnet_build_arp.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/libnet/src/libnet_build_arp.c b/libnet/src/libnet_build_arp.c new file mode 100644 index 0000000..816b587 --- /dev/null +++ b/libnet/src/libnet_build_arp.c @@ -0,0 +1,155 @@ +/* + * $Id: libnet_build_arp.c,v 1.13 2004/04/13 17:32:28 mike Exp $ + * + * libnet + * libnet_build_arp.c - ARP packet assembler + * + * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#if (HAVE_CONFIG_H) +#include "../include/config.h" +#endif +#if (!(_WIN32) || (__CYGWIN__)) +#include "../include/libnet.h" +#else +#include "../include/win32/libnet.h" +#endif + + +libnet_ptag_t +libnet_build_arp(u_int16_t hrd, u_int16_t pro, u_int8_t hln, u_int8_t pln, +u_int16_t op, u_int8_t *sha, u_int8_t *spa, u_int8_t *tha, u_int8_t *tpa, +u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_arp_hdr arp_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_ARP_H + (2 * hln) + (2 * pln) + payload_s; + h = 0; /* ARP headers have no checksum */ + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ARP_H); + if (p == NULL) + { + return (-1); + } + + memset(&arp_hdr, 0, sizeof(arp_hdr)); + arp_hdr.ar_hrd = htons(hrd); /* hardware address type */ + arp_hdr.ar_pro = htons(pro); /* protocol address type */ + arp_hdr.ar_hln = hln; /* hardware address length */ + arp_hdr.ar_pln = pln; /* protocol address length */ + arp_hdr.ar_op = htons(op); /* opcode command */ + + n = libnet_pblock_append(l, p, (u_int8_t *)&arp_hdr, LIBNET_ARP_H); + if (n == -1) + { + /* err msg set in libnet_pblock_append() */ + goto bad; + } + n = libnet_pblock_append(l, p, sha, hln); + if (n == -1) + { + /* err msg set in libnet_pblock_append() */ + goto bad; + } + n = libnet_pblock_append(l, p, spa, pln); + if (n == -1) + { + /* err msg set in libnet_pblock_append() */ + goto bad; + } + n = libnet_pblock_append(l, p, tha, hln); + if (n == -1) + { + /* err msg set in libnet_pblock_append() */ + goto bad; + } + n = libnet_pblock_append(l, p, tpa, pln); + if (n == -1) + { + /* err msg set in libnet_pblock_append() */ + goto bad; + } + + /* boilerplate payload sanity check / append macro */ + LIBNET_DO_PAYLOAD(l, p); + + return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ARP_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +libnet_ptag_t +libnet_autobuild_arp(u_int16_t op, u_int8_t *sha, u_int8_t *spa, u_int8_t *tha, +u_int8_t *tpa, libnet_t *l) +{ + u_short hrd; + + switch (l->link_type) + { + case 1: /* DLT_EN10MB */ + hrd = ARPHRD_ETHER; + break; + case 6: /* DLT_IEEE802 */ + hrd = ARPHRD_IEEE802; + break; + default: + hrd = 0; + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, + "%s(): unsupported link type\n", __func__); + return (-1); + /* add other link-layers */ + } + + return (libnet_build_arp( + hrd, /* hardware addr */ + ETHERTYPE_IP, /* protocol addr */ + 6, /* hardware addr size */ + 4, /* protocol addr size */ + op, /* operation type */ + sha, /* sender hardware addr */ + spa, /* sender protocol addr */ + tha, /* target hardware addr */ + tpa, /* target protocol addr */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet context */ + 0)); /* libnet id */ +} + +/* EOF */ |