| 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 */ |