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1 | /* |
2 | * $Id: libnet_build_icmp.c,v 1.20 2005/11/29 22:27:46 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_build_icmp.c - ICMP packet assemblers | |
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 | /* some common cruft for completing ICMP error packets */ | |
43 | #define LIBNET_BUILD_ICMP_ERR_FINISH(len) \ | |
44 | do \ | |
45 | { \ | |
46 | n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, len); \ | |
47 | if (n == -1) \ | |
48 | { \ | |
49 | goto bad; \ | |
50 | } \ | |
51 | \ | |
52 | if ((payload && !payload_s) || (!payload && payload_s)) \ | |
53 | { \ | |
54 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, \ | |
55 | "%s(): payload inconsistency\n", __func__); \ | |
56 | goto bad; \ | |
57 | } \ | |
58 | \ | |
59 | if (payload && payload_s) \ | |
60 | { \ | |
61 | n = libnet_pblock_append(l, p, payload, payload_s); \ | |
62 | if (n == -1) \ | |
63 | { \ | |
64 | goto bad; \ | |
65 | } \ | |
66 | } \ | |
67 | \ | |
68 | if (sum == 0) \ | |
69 | { \ | |
70 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); \ | |
71 | } \ | |
72 | } while (0) | |
73 | ||
74 | libnet_ptag_t | |
75 | libnet_build_icmpv4_echo(u_int8_t type, u_int8_t code, u_int16_t sum, | |
76 | u_int16_t id, u_int16_t seq, u_int8_t *payload, u_int32_t payload_s, | |
77 | libnet_t *l, libnet_ptag_t ptag) | |
78 | { | |
79 | u_int32_t n, h; | |
80 | libnet_pblock_t *p; | |
81 | struct libnet_icmpv4_hdr icmp_hdr; | |
82 | ||
83 | if (l == NULL) | |
84 | { | |
85 | return (-1); | |
86 | } | |
87 | ||
88 | n = LIBNET_ICMPV4_ECHO_H + payload_s; /* size of memory block */ | |
89 | h = LIBNET_ICMPV4_ECHO_H + payload_s; /* hl for checksum */ | |
90 | ||
91 | /* | |
92 | * Find the existing protocol block if a ptag is specified, or create | |
93 | * a new one. | |
94 | */ | |
95 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_ECHO_H); | |
96 | if (p == NULL) | |
97 | { | |
98 | return (-1); | |
99 | } | |
100 | ||
101 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
102 | icmp_hdr.icmp_type = type; /* packet type */ | |
103 | icmp_hdr.icmp_code = code; /* packet code */ | |
104 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
105 | icmp_hdr.icmp_id = htons(id); /* packet id */ | |
106 | icmp_hdr.icmp_seq = htons(seq); /* packet seq */ | |
107 | ||
108 | n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_ECHO_H); | |
109 | if (n == -1) | |
110 | { | |
111 | goto bad; | |
112 | } | |
113 | ||
114 | if ((payload && !payload_s) || (!payload && payload_s)) | |
115 | { | |
116 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
117 | "%s(): payload inconsistency\n", __func__); | |
118 | goto bad; | |
119 | } | |
120 | ||
121 | if (payload && payload_s) | |
122 | { | |
123 | n = libnet_pblock_append(l, p, payload, payload_s); | |
124 | if (n == -1) | |
125 | { | |
126 | goto bad; | |
127 | } | |
128 | } | |
129 | ||
130 | if (sum == 0) | |
131 | { | |
132 | /* | |
133 | * If checksum is zero, by default libnet will compute a checksum | |
134 | * for the user. The programmer can override this by calling | |
135 | * libnet_toggle_checksum(l, ptag, 1); | |
136 | */ | |
137 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); | |
138 | } | |
139 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
140 | LIBNET_PBLOCK_ICMPV4_ECHO_H)); | |
141 | bad: | |
142 | libnet_pblock_delete(l, p); | |
143 | return (-1); | |
144 | } | |
145 | ||
146 | libnet_ptag_t | |
147 | libnet_build_icmpv4_mask(u_int8_t type, u_int8_t code, u_int16_t sum, | |
148 | u_int16_t id, u_int16_t seq, u_int32_t mask, u_int8_t *payload, | |
149 | u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
150 | { | |
151 | u_int32_t n, h; | |
152 | libnet_pblock_t *p; | |
153 | struct libnet_icmpv4_hdr icmp_hdr; | |
154 | ||
155 | if (l == NULL) | |
156 | { | |
157 | return (-1); | |
158 | } | |
159 | ||
160 | n = LIBNET_ICMPV4_MASK_H + payload_s; /* size of memory block */ | |
161 | h = LIBNET_ICMPV4_MASK_H + payload_s; /* hl for checksum */ | |
162 | ||
163 | /* | |
164 | * Find the existing protocol block if a ptag is specified, or create | |
165 | * a new one. | |
166 | */ | |
167 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_MASK_H); | |
168 | if (p == NULL) | |
169 | { | |
170 | return (-1); | |
171 | } | |
172 | ||
173 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
174 | icmp_hdr.icmp_type = type; /* packet type */ | |
175 | icmp_hdr.icmp_code = code; /* packet code */ | |
176 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
177 | icmp_hdr.icmp_id = htons(id); /* packet id */ | |
178 | icmp_hdr.icmp_seq = htons(seq); /* packet seq */ | |
179 | icmp_hdr.icmp_mask = htonl(mask); /* address mask */ | |
180 | ||
181 | n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_MASK_H); | |
182 | if (n == -1) | |
183 | { | |
184 | goto bad; | |
185 | } | |
186 | ||
187 | if ((payload && !payload_s) || (!payload && payload_s)) | |
188 | { | |
189 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
190 | "%s(): payload inconsistency\n", __func__); | |
191 | goto bad; | |
192 | } | |
193 | ||
194 | if (payload && payload_s) | |
195 | { | |
196 | n = libnet_pblock_append(l, p, payload, payload_s); | |
197 | if (n == -1) | |
198 | { | |
199 | goto bad; | |
200 | } | |
201 | } | |
202 | ||
203 | if (sum == 0) | |
204 | { | |
205 | /* | |
206 | * If checksum is zero, by default libnet will compute a checksum | |
207 | * for the user. The programmer can override this by calling | |
208 | * libnet_toggle_checksum(l, ptag, 1); | |
209 | */ | |
210 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); | |
211 | } | |
212 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
213 | LIBNET_PBLOCK_ICMPV4_MASK_H)); | |
214 | bad: | |
215 | libnet_pblock_delete(l, p); | |
216 | return (-1); | |
217 | } | |
218 | ||
219 | libnet_ptag_t | |
220 | libnet_build_icmpv4_timestamp(u_int8_t type, u_int8_t code, u_int16_t sum, | |
221 | u_int16_t id, u_int16_t seq, n_time otime, n_time rtime, n_time ttime, | |
222 | u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
223 | { | |
224 | u_int32_t n, h; | |
225 | libnet_pblock_t *p; | |
226 | struct libnet_icmpv4_hdr icmp_hdr; | |
227 | ||
228 | if (l == NULL) | |
229 | { | |
230 | return (-1); | |
231 | } | |
232 | ||
233 | n = LIBNET_ICMPV4_TS_H + payload_s; /* size of memory block */ | |
234 | h = LIBNET_ICMPV4_TS_H + payload_s; /* hl for checksum */ | |
235 | ||
236 | /* | |
237 | * Find the existing protocol block if a ptag is specified, or create | |
238 | * a new one. | |
239 | */ | |
240 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_TS_H); | |
241 | if (p == NULL) | |
242 | { | |
243 | return (-1); | |
244 | } | |
245 | ||
246 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
247 | icmp_hdr.icmp_type = type; /* packet type */ | |
248 | icmp_hdr.icmp_code = code; /* packet code */ | |
249 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
250 | icmp_hdr.icmp_id = htons(id); /* packet id */ | |
251 | icmp_hdr.icmp_seq = htons(seq); /* packet seq */ | |
252 | icmp_hdr.icmp_otime = htonl(otime); /* original timestamp */ | |
253 | icmp_hdr.icmp_rtime = htonl(rtime); /* receive timestamp */ | |
254 | icmp_hdr.icmp_ttime = htonl(ttime); /* transmit timestamp */ | |
255 | ||
256 | n = libnet_pblock_append(l, p, (u_int8_t *)&icmp_hdr, LIBNET_ICMPV4_TS_H); | |
257 | if (n == -1) | |
258 | { | |
259 | goto bad; | |
260 | } | |
261 | ||
262 | if ((payload && !payload_s) || (!payload && payload_s)) | |
263 | { | |
264 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
265 | "%s(): payload inconsistency\n", __func__); | |
266 | goto bad; | |
267 | } | |
268 | ||
269 | if (payload && payload_s) | |
270 | { | |
271 | n = libnet_pblock_append(l, p, payload, payload_s); | |
272 | if (n == -1) | |
273 | { | |
274 | goto bad; | |
275 | } | |
276 | } | |
277 | ||
278 | if (sum == 0) | |
279 | { | |
280 | /* | |
281 | * If checksum is zero, by default libnet will compute a checksum | |
282 | * for the user. The programmer can override this by calling | |
283 | * libnet_toggle_checksum(l, ptag, 1); | |
284 | */ | |
285 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); | |
286 | } | |
287 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
288 | LIBNET_PBLOCK_ICMPV4_TS_H)); | |
289 | bad: | |
290 | libnet_pblock_delete(l, p); | |
291 | return (-1); | |
292 | } | |
293 | ||
294 | libnet_ptag_t | |
295 | libnet_build_icmpv4_unreach(u_int8_t type, u_int8_t code, u_int16_t sum, | |
296 | u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
297 | { | |
298 | u_int32_t n, h; | |
299 | libnet_pblock_t *p; | |
300 | struct libnet_icmpv4_hdr icmp_hdr; | |
301 | ||
302 | if (l == NULL) | |
303 | { | |
304 | return (-1); | |
305 | } | |
306 | n = LIBNET_ICMPV4_UNREACH_H + payload_s; /* size of memory block */ | |
307 | ||
308 | /* | |
309 | * FREDRAYNAL: as ICMP checksum includes what is embedded in | |
310 | * the payload, and what is after the ICMP header, we need to include | |
311 | * those 2 sizes. | |
312 | */ | |
313 | h = LIBNET_ICMPV4_UNREACH_H + payload_s + l->total_size; | |
314 | ||
315 | /* | |
316 | * Find the existing protocol block if a ptag is specified, or create | |
317 | * a new one. | |
318 | */ | |
319 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_UNREACH_H); | |
320 | if (p == NULL) | |
321 | { | |
322 | return (-1); | |
323 | } | |
324 | ||
325 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
326 | icmp_hdr.icmp_type = type; /* packet type */ | |
327 | icmp_hdr.icmp_code = code; /* packet code */ | |
328 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
329 | icmp_hdr.icmp_id = 0; /* must be 0 */ | |
330 | icmp_hdr.icmp_seq = 0; /* must be 0 */ | |
331 | ||
332 | LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_UNREACH_H); | |
333 | ||
334 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
335 | LIBNET_PBLOCK_ICMPV4_UNREACH_H)); | |
336 | bad: | |
337 | libnet_pblock_delete(l, p); | |
338 | return (-1); | |
339 | } | |
340 | ||
341 | libnet_ptag_t | |
342 | libnet_build_icmpv4_timeexceed(u_int8_t type, u_int8_t code, u_int16_t sum, | |
343 | u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
344 | { | |
345 | u_int32_t n, h; | |
346 | libnet_pblock_t *p; | |
347 | struct libnet_icmpv4_hdr icmp_hdr; | |
348 | ||
349 | if (l == NULL) | |
350 | { | |
351 | return (-1); | |
352 | } | |
353 | ||
354 | /* size of memory block */ | |
355 | n = LIBNET_ICMPV4_TIMXCEED_H; | |
356 | /* | |
357 | * FREDRAYNAL: as ICMP checksum includes what is embedded in | |
358 | * the payload, and what is after the ICMP header, we need to include | |
359 | * those 2 sizes. | |
360 | */ | |
361 | h = LIBNET_ICMPV4_TIMXCEED_H + payload_s + l->total_size; | |
362 | ||
363 | /* | |
364 | * Find the existing protocol block if a ptag is specified, or create | |
365 | * a new one. | |
366 | */ | |
367 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_TIMXCEED_H); | |
368 | if (p == NULL) | |
369 | { | |
370 | return (-1); | |
371 | } | |
372 | ||
373 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
374 | icmp_hdr.icmp_type = type; /* packet type */ | |
375 | icmp_hdr.icmp_code = code; /* packet code */ | |
376 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
377 | icmp_hdr.icmp_id = 0; /* must be 0 */ | |
378 | icmp_hdr.icmp_seq = 0; /* must be 0 */ | |
379 | ||
380 | LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_TIMXCEED_H); | |
381 | ||
382 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
383 | LIBNET_PBLOCK_ICMPV4_TIMXCEED_H)); | |
384 | bad: | |
385 | libnet_pblock_delete(l, p); | |
386 | return (-1); | |
387 | } | |
388 | ||
389 | libnet_ptag_t | |
390 | libnet_build_icmpv4_redirect(u_int8_t type, u_int8_t code, u_int16_t sum, | |
391 | u_int32_t gateway, u_int8_t *payload, u_int32_t payload_s, libnet_t *l, | |
392 | libnet_ptag_t ptag) | |
393 | ||
394 | { | |
395 | u_int32_t n, h; | |
396 | libnet_pblock_t *p; | |
397 | struct libnet_icmpv4_hdr icmp_hdr; | |
398 | ||
399 | if (l == NULL) | |
400 | { | |
401 | return (-1); | |
402 | } | |
403 | ||
404 | n = LIBNET_ICMPV4_REDIRECT_H; /* size of memory block */ | |
405 | /* | |
406 | * FREDRAYNAL: as ICMP checksum includes what is embedded in | |
407 | * the payload, and what is after the ICMP header, we need to include | |
408 | * those 2 sizes. | |
409 | */ | |
410 | h = LIBNET_ICMPV4_REDIRECT_H + payload_s + l->total_size; | |
411 | ||
412 | /* | |
413 | * Find the existing protocol block if a ptag is specified, or create | |
414 | * a new one. | |
415 | */ | |
416 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ICMPV4_REDIRECT_H); | |
417 | if (p == NULL) | |
418 | { | |
419 | return (-1); | |
420 | } | |
421 | ||
422 | memset(&icmp_hdr, 0, sizeof(icmp_hdr)); | |
423 | icmp_hdr.icmp_type = type; /* packet type */ | |
424 | icmp_hdr.icmp_code = code; /* packet code */ | |
425 | icmp_hdr.icmp_sum = (sum ? htons(sum) : 0); /* checksum */ | |
426 | icmp_hdr.hun.gateway = gateway; | |
427 | ||
428 | LIBNET_BUILD_ICMP_ERR_FINISH(LIBNET_ICMPV4_REDIRECT_H); | |
429 | ||
430 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
431 | LIBNET_PBLOCK_ICMPV4_REDIRECT_H)); | |
432 | bad: | |
433 | libnet_pblock_delete(l, p); | |
434 | return (-1); | |
435 | } | |
436 | ||
437 | /* EOF */ |