Annotation of embedaddon/libnet/src/libnet_build_dhcp.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: libnet_build_dhcp.c,v 1.10 2004/03/01 20:26:12 mike Exp $
! 3: *
! 4: * libnet
! 5: * libnet_build_dhcp.c - DHCP/BOOTP packet assembler
! 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: #if (HAVE_CONFIG_H)
! 34: #include "../include/config.h"
! 35: #endif
! 36: #if (!(_WIN32) || (__CYGWIN__))
! 37: #include "../include/libnet.h"
! 38: #else
! 39: #include "../include/win32/libnet.h"
! 40: #endif
! 41:
! 42: libnet_ptag_t
! 43: libnet_build_dhcpv4(u_int8_t opcode, u_int8_t htype, u_int8_t hlen,
! 44: u_int8_t hopcount, u_int32_t xid, u_int16_t secs, u_int16_t flags,
! 45: u_int32_t cip, u_int32_t yip, u_int32_t sip, u_int32_t gip, u_int8_t *chaddr,
! 46: u_int8_t *sname, u_int8_t *file, u_int8_t *payload, u_int32_t payload_s,
! 47: libnet_t *l, libnet_ptag_t ptag)
! 48: {
! 49: u_int32_t n, h;
! 50: libnet_pblock_t *p;
! 51: struct libnet_dhcpv4_hdr dhcp_hdr;
! 52:
! 53: if (l == NULL)
! 54: {
! 55: return (-1);
! 56: }
! 57:
! 58: n = LIBNET_DHCPV4_H + payload_s;
! 59: h = 0; /* no checksum */
! 60:
! 61: /*
! 62: * Find the existing protocol block if a ptag is specified, or create
! 63: * a new one.
! 64: */
! 65: p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DHCPV4_H);
! 66: if (p == NULL)
! 67: {
! 68: return (-1);
! 69: }
! 70:
! 71: memset(&dhcp_hdr, 0, sizeof(dhcp_hdr));
! 72: dhcp_hdr.dhcp_opcode = opcode;
! 73: dhcp_hdr.dhcp_htype = htype;
! 74: dhcp_hdr.dhcp_hlen = hlen;
! 75: dhcp_hdr.dhcp_hopcount = hopcount;
! 76: dhcp_hdr.dhcp_xid = htonl(xid);
! 77: dhcp_hdr.dhcp_secs = htons(secs);
! 78: dhcp_hdr.dhcp_flags = htons(flags);
! 79: dhcp_hdr.dhcp_cip = htonl(cip);
! 80: dhcp_hdr.dhcp_yip = htonl(yip);
! 81: dhcp_hdr.dhcp_sip = htonl(sip);
! 82: dhcp_hdr.dhcp_gip = htonl(gip);
! 83:
! 84: if (chaddr)
! 85: {
! 86: memcpy(dhcp_hdr.dhcp_chaddr, chaddr, sizeof (dhcp_hdr.dhcp_chaddr));
! 87: dhcp_hdr.dhcp_chaddr[sizeof(dhcp_hdr.dhcp_chaddr) - 1] = 0;
! 88: }
! 89: else
! 90: {
! 91: memset(dhcp_hdr.dhcp_chaddr, 0, sizeof (dhcp_hdr.dhcp_chaddr));
! 92: }
! 93:
! 94: if (sname)
! 95: {
! 96: memcpy(dhcp_hdr.dhcp_sname, sname, sizeof (dhcp_hdr.dhcp_sname));
! 97: dhcp_hdr.dhcp_sname[sizeof(dhcp_hdr.dhcp_sname) - 1] = 0;
! 98: }
! 99: else
! 100: {
! 101: memset(dhcp_hdr.dhcp_sname, 0, sizeof (dhcp_hdr.dhcp_sname));
! 102: }
! 103:
! 104: if (file)
! 105: {
! 106: memcpy(dhcp_hdr.dhcp_file, file, sizeof (dhcp_hdr.dhcp_file));
! 107: dhcp_hdr.dhcp_file[sizeof(dhcp_hdr.dhcp_file) - 1] = 0;
! 108: }
! 109: else
! 110: {
! 111: memset(dhcp_hdr.dhcp_file, 0, sizeof(dhcp_hdr.dhcp_file));
! 112: }
! 113: dhcp_hdr.dhcp_magic = htonl(DHCP_MAGIC); /* should this be tunable? */
! 114:
! 115: n = libnet_pblock_append(l, p, (u_int8_t *)&dhcp_hdr, LIBNET_DHCPV4_H);
! 116: if (n == -1)
! 117: {
! 118: goto bad;
! 119: }
! 120:
! 121: if ((payload && !payload_s) || (!payload && payload_s))
! 122: {
! 123: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 124: "%s(): payload inconsistency\n", __func__);
! 125: goto bad;
! 126: }
! 127:
! 128: if (payload && payload_s)
! 129: {
! 130: n = libnet_pblock_append(l, p, payload, payload_s);
! 131: if (n == -1)
! 132: {
! 133: goto bad;
! 134: }
! 135: }
! 136:
! 137: return (ptag ? ptag : libnet_pblock_update(l, p, h,
! 138: LIBNET_PBLOCK_DHCPV4_H));
! 139: bad:
! 140: libnet_pblock_delete(l, p);
! 141: return (-1);
! 142: }
! 143:
! 144: libnet_ptag_t
! 145: libnet_build_bootpv4(u_int8_t opcode, u_int8_t htype, u_int8_t hlen,
! 146: u_int8_t hopcount, u_int32_t xid, u_int16_t secs, u_int16_t flags,
! 147: u_int32_t cip, u_int32_t yip, u_int32_t sip, u_int32_t gip, u_int8_t *chaddr,
! 148: u_int8_t *sname, u_int8_t *file, u_int8_t *payload, u_int32_t payload_s,
! 149: libnet_t *l, libnet_ptag_t ptag)
! 150: {
! 151: return (libnet_build_dhcpv4(opcode, htype, hlen, hopcount, xid, secs,
! 152: flags, cip, yip, sip, gip, chaddr, sname, file, payload, payload_s,
! 153: l, ptag));
! 154: }
! 155:
! 156: /* EOF */
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