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1 | /* |
2 | * $Id: libnet_raw.c,v 1.20 2005/11/29 22:11:10 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_raw.c - raw sockets routines | |
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 | #if defined (__WIN32__) | |
43 | int | |
44 | libnet_open_raw4(libnet_t *l) | |
45 | { | |
46 | return (libnet_open_link(l)); | |
47 | } | |
48 | ||
49 | int | |
50 | libnet_open_raw6(libnet_t *l) | |
51 | { | |
52 | return (libnet_open_link(l)); | |
53 | } | |
54 | ||
55 | int | |
56 | libnet_close_raw4(libnet_t *l) | |
57 | { | |
58 | return (libnet_close_link_interface(l)); | |
59 | } | |
60 | ||
61 | int | |
62 | libnet_close_raw6(libnet_t *l) | |
63 | { | |
64 | return (libnet_close_link_interface(l)); | |
65 | } | |
66 | #else | |
67 | int | |
68 | libnet_open_raw4(libnet_t *l) | |
69 | { | |
70 | int len; | |
71 | ||
72 | #if !(__WIN32__) | |
73 | int n = 1; | |
74 | #if (__svr4__) | |
75 | void *nptr = &n; | |
76 | #else | |
77 | int *nptr = &n; | |
78 | #endif /* __svr4__ */ | |
79 | #else | |
80 | BOOL n; | |
81 | #endif | |
82 | ||
83 | if (l == NULL) | |
84 | { | |
85 | return (-1); | |
86 | } | |
87 | ||
88 | l->fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); | |
89 | if (l->fd == -1) | |
90 | { | |
91 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
92 | "%s(): SOCK_RAW allocation failed: %s\n", | |
93 | __func__, strerror(errno)); | |
94 | goto bad; | |
95 | } | |
96 | ||
97 | #ifdef IP_HDRINCL | |
98 | /* | |
99 | * man raw | |
100 | * | |
101 | * The IPv4 layer generates an IP header when sending a packet unless | |
102 | * the IP_HDRINCL socket option is enabled on the socket. When it | |
103 | * is enabled, the packet must contain an IP header. For | |
104 | * receiving the IP header is always included in the packet. | |
105 | */ | |
106 | #if !(__WIN32__) | |
107 | if (setsockopt(l->fd, IPPROTO_IP, IP_HDRINCL, nptr, sizeof(n)) == -1) | |
108 | #else | |
109 | n = TRUE; | |
110 | if (setsockopt(l->fd, IPPROTO_IP, IP_HDRINCL, (int8_t *)&n, | |
111 | sizeof(n)) == -1) | |
112 | #endif | |
113 | ||
114 | { | |
115 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
116 | "%s(): set IP_HDRINCL failed: %s\n", | |
117 | __func__, strerror(errno)); | |
118 | goto bad; | |
119 | } | |
120 | #endif /* IP_HDRINCL */ | |
121 | ||
122 | #ifdef SO_SNDBUF | |
123 | ||
124 | /* | |
125 | * man 7 socket | |
126 | * | |
127 | * Sets and gets the maximum socket send buffer in bytes. | |
128 | * | |
129 | * Taken from libdnet by Dug Song | |
130 | */ | |
131 | len = sizeof(n); | |
132 | if (getsockopt(l->fd, SOL_SOCKET, SO_SNDBUF, &n, &len) < 0) | |
133 | { | |
134 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
135 | "%s(): get SO_SNDBUF failed: %s\n", | |
136 | __func__, strerror(errno)); | |
137 | goto bad; | |
138 | } | |
139 | ||
140 | for (n += 128; n < 1048576; n += 128) | |
141 | { | |
142 | if (setsockopt(l->fd, SOL_SOCKET, SO_SNDBUF, &n, len) < 0) | |
143 | { | |
144 | if (errno == ENOBUFS) | |
145 | { | |
146 | break; | |
147 | } | |
148 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
149 | "%s(): set SO_SNDBUF failed: %s\n", | |
150 | __func__, strerror(errno)); | |
151 | goto bad; | |
152 | } | |
153 | } | |
154 | #endif | |
155 | ||
156 | #ifdef SO_BROADCAST | |
157 | /* | |
158 | * man 7 socket | |
159 | * | |
160 | * Set or get the broadcast flag. When enabled, datagram sockets | |
161 | * receive packets sent to a broadcast address and they are allowed | |
162 | * to send packets to a broadcast address. This option has no | |
163 | * effect on stream-oriented sockets. | |
164 | */ | |
165 | if (setsockopt(l->fd, SOL_SOCKET, SO_BROADCAST, nptr, sizeof(n)) == -1) | |
166 | { | |
167 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
168 | "%s(): set SO_BROADCAST failed: %s\n", | |
169 | __func__, strerror(errno)); | |
170 | goto bad; | |
171 | } | |
172 | #endif /* SO_BROADCAST */ | |
173 | return (l->fd); | |
174 | ||
175 | bad: | |
176 | return (-1); | |
177 | } | |
178 | ||
179 | ||
180 | int | |
181 | libnet_close_raw4(libnet_t *l) | |
182 | { | |
183 | if (l == NULL) | |
184 | { | |
185 | return (-1); | |
186 | } | |
187 | ||
188 | return (close(l->fd)); | |
189 | } | |
190 | ||
191 | #if ((defined HAVE_SOLARIS && !defined HAVE_SOLARIS_IPV6) || defined (__WIN32__)) | |
192 | int libnet_open_raw6(libnet_t *l) | |
193 | { | |
194 | return (-1); | |
195 | } | |
196 | ||
197 | #else | |
198 | int | |
199 | libnet_open_raw6(libnet_t *l) | |
200 | { | |
201 | #if !(__WIN32__) | |
202 | #if (__svr4__) | |
203 | int one = 1; | |
204 | void *oneptr = &one; | |
205 | #else | |
206 | #if (__linux__) | |
207 | int one = 1; | |
208 | int *oneptr = &one; | |
209 | #endif | |
210 | #endif /* __svr4__ */ | |
211 | #else | |
212 | BOOL one; | |
213 | #endif | |
214 | ||
215 | /* Solaris IPv6 stuff */ | |
216 | ||
217 | if (l == NULL) | |
218 | { | |
219 | return (-1); | |
220 | } | |
221 | ||
222 | l->fd = socket(PF_INET6, SOCK_RAW, IPPROTO_RAW); | |
223 | if (l->fd == -1) | |
224 | { | |
225 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
226 | "%s(): SOCK_RAW allocation failed: %s\n", __func__, | |
227 | strerror(errno)); | |
228 | goto bad; | |
229 | } | |
230 | ||
231 | #if (__linux__) | |
232 | if (setsockopt(l->fd, SOL_SOCKET, SO_BROADCAST, oneptr, sizeof(one)) == -1) | |
233 | { | |
234 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
235 | "%s(): set SO_BROADCAST failed: %s\n", __func__, | |
236 | strerror(errno)); | |
237 | goto bad; | |
238 | } | |
239 | #endif /* __linux__ */ | |
240 | return (l->fd); | |
241 | ||
242 | bad: | |
243 | return (-1); | |
244 | } | |
245 | #endif | |
246 | ||
247 | int | |
248 | libnet_close_raw6(libnet_t *l) | |
249 | { | |
250 | if (l == NULL) | |
251 | { | |
252 | return (-1); | |
253 | } | |
254 | return (close(l->fd)); | |
255 | } | |
256 | #endif | |
257 | /* EOF */ |