Annotation of embedaddon/libnet/src/libnet_build_dhcp.c, revision 1.1.1.1
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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