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1 | /* |
2 | * $Id: libnet_build_dhcp.c,v 1.20 2005/11/29 22:19:59 carlosc 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 */ |