Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 1 | /* $USAGI: ninfod_core.c,v 1.29 2003-07-16 09:49:01 yoshfuji Exp $ */ |
| 2 | /* |
| 3 | * Copyright (C) 2002 USAGI/WIDE Project. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. Neither the name of the project nor the names of its contributors |
| 15 | * may be used to endorse or promote products derived from this software |
| 16 | * without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 28 | * SUCH DAMAGE. |
| 29 | */ |
| 30 | /* |
| 31 | * Author: |
| 32 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| 33 | */ |
| 34 | |
| 35 | #if HAVE_CONFIG_H |
| 36 | #include "config.h" |
| 37 | #endif |
| 38 | |
| 39 | #if HAVE_SYS_TYPES_H |
| 40 | # include <sys/types.h> |
| 41 | #endif |
| 42 | #if STDC_HEADERS |
| 43 | # include <stdio.h> |
| 44 | # include <stdlib.h> |
| 45 | # include <stddef.h> |
| 46 | #else |
| 47 | # if HAVE_STDLIB_H |
| 48 | # include <stdlib.h> |
| 49 | # endif |
| 50 | #endif |
| 51 | #if ENABLE_THREADS && HAVE_PTHREAD_H |
| 52 | # include <pthread.h> |
| 53 | #endif |
| 54 | #if HAVE_STRING_H |
| 55 | # if !STDC_HEADERS && HAVE_MEMORY_H |
| 56 | # include <memory.h> |
| 57 | # endif |
| 58 | # include <string.h> |
| 59 | #endif |
| 60 | #if HAVE_STRINGS_H |
| 61 | # include <strings.h> |
| 62 | #endif |
| 63 | #if HAVE_INTTYPES_H |
| 64 | # include <inttypes.h> |
| 65 | #else |
| 66 | # if HAVE_STDINT_H |
| 67 | # include <stdint.h> |
| 68 | # endif |
| 69 | #endif |
| 70 | #if HAVE_UNISTD_H |
| 71 | # include <unistd.h> |
| 72 | #endif |
| 73 | |
| 74 | #if TIME_WITH_SYS_TIME |
| 75 | # include <sys/time.h> |
| 76 | # include <time.h> |
| 77 | #else |
| 78 | # if HAVE_SYS_TIME_H |
| 79 | # include <sys/time.h> |
| 80 | # else |
| 81 | # include <time.h> |
| 82 | # endif |
| 83 | #endif |
| 84 | |
| 85 | #if HAVE_SYS_UIO_H |
| 86 | #include <sys/uio.h> |
| 87 | #endif |
| 88 | |
| 89 | #if HAVE_NETINET_IN_H |
| 90 | # include <netinet/in.h> |
| 91 | #endif |
| 92 | |
| 93 | #if HAVE_NETINET_ICMP6_H |
| 94 | # include <netinet/icmp6.h> |
| 95 | #endif |
| 96 | #ifndef HAVE_STRUCT_ICMP6_NODEINFO |
| 97 | # include "icmp6_nodeinfo.h" |
| 98 | #endif |
| 99 | |
| 100 | #if HAVE_NETDB_H |
| 101 | # include <netdb.h> |
| 102 | #endif |
| 103 | #include <errno.h> |
| 104 | |
| 105 | #if HAVE_SYSLOG_H |
| 106 | # include <syslog.h> |
| 107 | #endif |
| 108 | |
| 109 | #include "ninfod.h" |
| 110 | |
| 111 | #ifndef offsetof |
| 112 | # define offsetof(aggregate,member) ((size_t)&((aggregate *)0)->member) |
| 113 | #endif |
| 114 | |
| 115 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 116 | |
| 117 | /* ---------- */ |
| 118 | /* ID */ |
| 119 | static char *RCSID __attribute__ ((unused)) = "$USAGI: ninfod_core.c,v 1.29 2003-07-16 09:49:01 yoshfuji Exp $"; |
| 120 | |
| 121 | /* Variables */ |
| 122 | int initialized = 0; |
| 123 | |
| 124 | #if ENABLE_THREADS && HAVE_LIBPTHREAD |
| 125 | pthread_attr_t pattr; |
| 126 | #endif |
| 127 | |
| 128 | static uint32_t suptypes[(MAX_SUPTYPES+31)>>5]; |
| 129 | static size_t suptypes_len; |
| 130 | |
| 131 | /* ---------- */ |
| 132 | struct subjinfo { |
| 133 | uint8_t code; |
| 134 | char *name; |
| 135 | int (*checksubj)(CHECKANDFILL_ARGS); |
| 136 | int (*init)(INIT_ARGS); |
| 137 | }; |
| 138 | |
| 139 | static struct subjinfo subjinfo_table [] = { |
| 140 | [ICMP6_NI_SUBJ_IPV6] = { |
| 141 | .code = ICMP6_NI_SUBJ_IPV6, |
| 142 | .name = "IPv6", |
| 143 | //.init = init_nodeinfo_ipv6addr, |
| 144 | .checksubj = pr_nodeinfo_ipv6addr, |
| 145 | }, |
| 146 | [ICMP6_NI_SUBJ_FQDN] = { |
| 147 | .code = ICMP6_NI_SUBJ_FQDN, |
| 148 | .name = "FQDN", |
| 149 | //.init = init_nodeinfo_nodename, |
| 150 | .checksubj = pr_nodeinfo_nodename, |
| 151 | }, |
| 152 | [ICMP6_NI_SUBJ_IPV4] = { |
| 153 | .code = ICMP6_NI_SUBJ_IPV4, |
| 154 | .name = "IPv4", |
| 155 | //.init = init_nodeinfo_ipv4addr, |
| 156 | .checksubj = pr_nodeinfo_ipv4addr, |
| 157 | }, |
| 158 | }; |
| 159 | |
| 160 | static struct subjinfo subjinfo_null = { |
| 161 | .name = "null", |
| 162 | .checksubj = pr_nodeinfo_noop, |
| 163 | }; |
| 164 | |
| 165 | static __inline__ struct subjinfo *subjinfo_lookup(int code) |
| 166 | { |
| 167 | if (code >= ARRAY_SIZE(subjinfo_table)) |
| 168 | return NULL; |
| 169 | if (subjinfo_table[code].name == NULL) |
| 170 | return NULL; |
| 171 | return &subjinfo_table[code]; |
| 172 | } |
| 173 | |
| 174 | /* ---------- */ |
| 175 | #define QTYPEINFO_F_RATELIMIT 0x1 |
| 176 | |
| 177 | struct qtypeinfo { |
| 178 | uint16_t qtype; |
| 179 | char *name; |
| 180 | int (*getreply)(CHECKANDFILL_ARGS); |
| 181 | void (*init)(INIT_ARGS); |
| 182 | int flags; |
| 183 | }; |
| 184 | |
| 185 | static struct qtypeinfo qtypeinfo_table[] = { |
| 186 | [NI_QTYPE_NOOP] = { |
| 187 | .qtype = NI_QTYPE_NOOP, |
| 188 | .name = "NOOP", |
| 189 | .getreply = pr_nodeinfo_noop, |
| 190 | }, |
| 191 | #if ENABLE_SUPTYPES |
| 192 | [NI_QTYPE_SUPTYPES] = { |
| 193 | .qtype = NI_QTYPE_SUPTYPES, |
| 194 | .name = "SupTypes", |
| 195 | .getreply = pr_nodeinfo_suptypes, |
| 196 | .init = init_nodeinfo_suptypes, |
| 197 | }, |
| 198 | #endif |
| 199 | [NI_QTYPE_DNSNAME] = { |
| 200 | .qtype = NI_QTYPE_DNSNAME, |
| 201 | .name = "DnsName", |
| 202 | .getreply = pr_nodeinfo_nodename, |
| 203 | .init = init_nodeinfo_nodename, |
| 204 | }, |
| 205 | [NI_QTYPE_NODEADDR] = { |
| 206 | .qtype = NI_QTYPE_NODEADDR, |
| 207 | .name = "NodeAddr", |
| 208 | .getreply = pr_nodeinfo_ipv6addr, |
| 209 | .init = init_nodeinfo_ipv6addr, |
| 210 | }, |
| 211 | [NI_QTYPE_IPV4ADDR] = { |
| 212 | .qtype = NI_QTYPE_IPV4ADDR, |
| 213 | .name = "IPv4Addr", |
| 214 | .getreply = pr_nodeinfo_ipv4addr, |
| 215 | .init = init_nodeinfo_ipv4addr, |
| 216 | }, |
| 217 | }; |
| 218 | |
| 219 | static struct qtypeinfo qtypeinfo_unknown = { |
| 220 | .name = "unknown", |
| 221 | .getreply = pr_nodeinfo_unknown, |
| 222 | .flags = QTYPEINFO_F_RATELIMIT, |
| 223 | }; |
| 224 | |
| 225 | static struct qtypeinfo qtypeinfo_refused = { |
| 226 | .name = "refused", |
| 227 | .getreply = pr_nodeinfo_refused, |
| 228 | .flags = QTYPEINFO_F_RATELIMIT, |
| 229 | }; |
| 230 | |
| 231 | static __inline__ struct qtypeinfo *qtypeinfo_lookup(int qtype) |
| 232 | { |
| 233 | if (qtype >= ARRAY_SIZE(qtypeinfo_table)) |
| 234 | return &qtypeinfo_unknown; |
| 235 | if (qtypeinfo_table[qtype].name == NULL) |
| 236 | return &qtypeinfo_unknown; |
| 237 | return &qtypeinfo_table[qtype]; |
| 238 | } |
| 239 | |
| 240 | /* ---------- */ |
| 241 | /* noop */ |
| 242 | int pr_nodeinfo_noop(CHECKANDFILL_ARGS) |
| 243 | { |
| 244 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 245 | |
| 246 | if (subjlen) { |
| 247 | DEBUG(LOG_WARNING, |
| 248 | "%s(): invalid subject length(%zu)\n", |
| 249 | __func__, subjlen); |
| 250 | return 1; |
| 251 | } |
| 252 | |
| 253 | if (reply) { |
| 254 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 255 | p->reply.ni_code = ICMP6_NI_SUCCESS; |
| 256 | p->reply.ni_cksum = 0; |
| 257 | p->reply.ni_qtype = htons(NI_QTYPE_NOOP); |
| 258 | p->reply.ni_flags = flags; |
| 259 | } |
| 260 | |
| 261 | if (subj_if) |
| 262 | *subj_if = 0; |
| 263 | |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | #if ENABLE_SUPTYPES |
| 268 | /* suptypes */ |
| 269 | int pr_nodeinfo_suptypes(CHECKANDFILL_ARGS) |
| 270 | { |
| 271 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 272 | |
| 273 | if (subjlen) { |
| 274 | DEBUG(LOG_WARNING, "%s(): invalid subject length(%zu)\n", |
| 275 | __func__, subjlen); |
| 276 | return 1; |
| 277 | } |
| 278 | |
| 279 | if (reply) { |
| 280 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 281 | p->reply.ni_code = ICMP6_NI_SUCCESS; |
| 282 | p->reply.ni_cksum = 0; |
| 283 | p->reply.ni_qtype = htons(NI_QTYPE_SUPTYPES); |
| 284 | p->reply.ni_flags = flags&~NI_SUPTYPE_FLAG_COMPRESS; |
| 285 | |
| 286 | p->replydatalen = suptypes_len<<2; |
| 287 | p->replydata = ni_malloc(p->replydatalen); |
| 288 | if (p->replydata == NULL) { |
| 289 | p->replydatalen = -1; |
| 290 | return -1; /*XXX*/ |
| 291 | } |
| 292 | |
| 293 | memcpy(p->replydata, suptypes, p->replydatalen); |
| 294 | } |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | void init_nodeinfo_suptypes(INIT_ARGS) |
| 299 | { |
| 300 | size_t w, b; |
| 301 | int i; |
| 302 | |
| 303 | if (!forced && initialized) |
| 304 | return; |
| 305 | |
| 306 | memset(suptypes, 0, sizeof(suptypes)); |
| 307 | suptypes_len = 0; |
| 308 | |
| 309 | for (i=0; i < ARRAY_SIZE(qtypeinfo_table); i++) { |
| 310 | unsigned short qtype; |
| 311 | |
| 312 | if (qtypeinfo_table[i].name == NULL) |
| 313 | continue; |
| 314 | qtype = qtypeinfo_table[i].qtype; |
| 315 | w = qtype>>5; |
| 316 | b = qtype&0x1f; |
| 317 | if (w >= ARRAY_SIZE(suptypes)) { |
| 318 | /* This is programming error. */ |
| 319 | DEBUG(LOG_ERR, "Warning: Too Large Supported Types\n"); |
| 320 | exit(1); |
| 321 | } |
| 322 | suptypes[w] |= htonl(1<<b); |
| 323 | |
| 324 | if (suptypes_len < w) |
| 325 | suptypes_len = w; |
| 326 | } |
| 327 | suptypes_len++; |
| 328 | } |
| 329 | #endif |
| 330 | |
| 331 | /* ---------- */ |
| 332 | /* unknown qtype response */ |
| 333 | int pr_nodeinfo_unknown(CHECKANDFILL_ARGS) |
| 334 | { |
| 335 | if (!reply) |
| 336 | return -1; /*???*/ |
| 337 | |
| 338 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 339 | p->reply.ni_code = ICMP6_NI_UNKNOWN; |
| 340 | p->reply.ni_cksum = 0; |
| 341 | //p->reply.ni_qtype = 0; |
| 342 | p->reply.ni_flags = flags; |
| 343 | |
| 344 | p->replydata = NULL; |
| 345 | p->replydatalen = 0; |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | /* refused response */ |
| 351 | int pr_nodeinfo_refused(CHECKANDFILL_ARGS) |
| 352 | { |
| 353 | if (!reply) |
| 354 | return -1; /*???*/ |
| 355 | |
| 356 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 357 | p->reply.ni_code = ICMP6_NI_REFUSED; |
| 358 | p->reply.ni_cksum = 0; |
| 359 | //p->reply.ni_qtype = 0; |
| 360 | p->reply.ni_flags = flags; |
| 361 | |
| 362 | p->replydata = NULL; |
| 363 | p->replydatalen = 0; |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | /* ---------- */ |
| 369 | /* Policy */ |
| 370 | static int ni_policy(struct packetcontext *p) |
| 371 | { |
| 372 | const struct in6_addr *saddr = &((const struct sockaddr_in6 *)&p->addr)->sin6_addr; |
| 373 | |
| 374 | /* |
| 375 | * >0: reply |
| 376 | * 0: refused |
| 377 | * <0: discard |
| 378 | */ |
| 379 | |
| 380 | /* Default policy is to refuse queries from |
| 381 | * non-local addresses; loopback, link-local or |
| 382 | * site-local are okay |
| 383 | */ |
| 384 | if (!(IN6_IS_ADDR_LINKLOCAL(saddr) || |
| 385 | IN6_IS_ADDR_SITELOCAL(saddr) || |
| 386 | IN6_IS_ADDR_LOOPBACK(saddr))) |
| 387 | return 0; |
| 388 | return 1; |
| 389 | } |
| 390 | |
| 391 | /* ---------- */ |
| 392 | void init_core(int forced) |
| 393 | { |
| 394 | int i; |
| 395 | |
| 396 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 397 | |
| 398 | if (!initialized || forced) { |
| 399 | struct timeval tv; |
| 400 | unsigned int seed = 0; |
| 401 | pid_t pid; |
| 402 | |
| 403 | if (gettimeofday(&tv, NULL) < 0) { |
| 404 | DEBUG(LOG_WARNING, "%s(): failed to gettimeofday()\n", __func__); |
| 405 | } else { |
| 406 | seed = (tv.tv_usec & 0xffffffff); |
| 407 | } |
| 408 | |
| 409 | pid = getpid(); |
| 410 | seed ^= (((unsigned long)pid) & 0xffffffff); |
| 411 | |
| 412 | srand(seed); |
| 413 | |
| 414 | #if ENABLE_THREADS && HAVE_LIBPTHREAD |
| 415 | if (initialized) |
| 416 | pthread_attr_destroy(&pattr); |
| 417 | |
| 418 | pthread_attr_init(&pattr); |
| 419 | pthread_attr_setdetachstate(&pattr, PTHREAD_CREATE_DETACHED); |
| 420 | #endif |
| 421 | } |
| 422 | |
| 423 | for (i=0; i < ARRAY_SIZE(subjinfo_table); i++) { |
| 424 | if (subjinfo_table[i].name == NULL) |
| 425 | continue; |
| 426 | if (subjinfo_table[i].init) |
| 427 | subjinfo_table[i].init(forced); |
| 428 | } |
| 429 | |
| 430 | for (i=0; i < ARRAY_SIZE(qtypeinfo_table); i++) { |
| 431 | if (qtypeinfo_table[i].name == NULL) |
| 432 | continue; |
| 433 | if (qtypeinfo_table[i].init) |
| 434 | qtypeinfo_table[i].init(forced); |
| 435 | } |
| 436 | |
| 437 | initialized = 1; |
| 438 | |
| 439 | return; |
| 440 | } |
| 441 | |
| 442 | #if ENABLE_THREADS && HAVE_LIBPTHREAD |
| 443 | static void *ni_send_thread(void *data) |
| 444 | { |
| 445 | int ret; |
| 446 | DEBUG(LOG_DEBUG, "%s(): thread=%ld\n", __func__, pthread_self()); |
| 447 | ret = ni_send(data); |
| 448 | DEBUG(LOG_DEBUG, "%s(): thread=%ld => %d\n", __func__, pthread_self(), ret); |
| 449 | return NULL; |
| 450 | } |
| 451 | #else |
| 452 | static int ni_send_fork(struct packetcontext *p) |
| 453 | { |
| 454 | pid_t child = fork(); |
| 455 | if (child < 0) |
| 456 | return -1; |
| 457 | if (child == 0) { |
| 458 | pid_t grandchild = fork(); |
| 459 | if (grandchild < 0) |
| 460 | exit(1); |
| 461 | if (grandchild == 0) { |
| 462 | int ret; |
| 463 | DEBUG(LOG_DEBUG, "%s(): worker=%d\n", |
| 464 | __func__, getpid()); |
| 465 | ret = ni_send(p); |
| 466 | DEBUG(LOG_DEBUG, "%s(): worker=%d => %d\n", |
| 467 | __func__, getpid(), ret); |
| 468 | exit(ret > 0 ? 1 : 0); |
| 469 | } |
| 470 | ni_free(p->replydata); |
| 471 | ni_free(p); |
| 472 | exit(0); |
| 473 | } else { |
| 474 | waitpid(child, NULL, 0); |
| 475 | ni_free(p->replydata); |
| 476 | ni_free(p); |
| 477 | } |
| 478 | return 0; |
| 479 | } |
| 480 | #endif |
| 481 | |
| 482 | static int ni_ratelimit(void) |
| 483 | { |
| 484 | static struct timeval last; |
| 485 | struct timeval tv, sub; |
| 486 | |
| 487 | if (gettimeofday(&tv, NULL) < 0) { |
| 488 | DEBUG(LOG_WARNING, "%s(): gettimeofday(): %s\n", |
| 489 | __func__, strerror(errno)); |
| 490 | return -1; |
| 491 | } |
| 492 | |
| 493 | if (!timerisset(&last)) { |
| 494 | last = tv; |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | timersub(&tv, &last, &sub); |
| 499 | |
| 500 | if (sub.tv_sec < 1) |
| 501 | return 1; |
| 502 | |
| 503 | last = tv; |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | int pr_nodeinfo(struct packetcontext *p) |
| 508 | { |
| 509 | struct icmp6_nodeinfo *query = (struct icmp6_nodeinfo *)p->query; |
| 510 | |
| 511 | char *subject = (char *)(query + 1); |
| 512 | size_t subjlen; |
| 513 | struct subjinfo *subjinfo; |
| 514 | struct qtypeinfo *qtypeinfo; |
| 515 | int replyonsubjcheck = 0; |
| 516 | unsigned int subj_if; |
| 517 | #if ENABLE_DEBUG |
| 518 | char printbuf[128]; |
| 519 | int i; |
| 520 | char *cp; |
| 521 | #endif |
| 522 | #if ENABLE_THREADS && HAVE_PTHREAD_H |
| 523 | pthread_t thread; |
| 524 | #endif |
| 525 | int rc; |
| 526 | |
| 527 | /* Step 0: Check destination address |
| 528 | * discard non-linklocal multicast |
| 529 | * discard non-nigroup multicast address(?) |
| 530 | */ |
| 531 | if (IN6_IS_ADDR_MULTICAST(&p->pktinfo.ipi6_addr)) { |
| 532 | if (!IN6_IS_ADDR_MC_LINKLOCAL(&p->pktinfo.ipi6_addr)) { |
| 533 | DEBUG(LOG_WARNING, |
| 534 | "Destination is non-link-local multicast address.\n"); |
| 535 | ni_free(p); |
| 536 | return -1; |
| 537 | } |
| 538 | #if 0 |
| 539 | /* Do not discard NI Queries to multicast address |
| 540 | * other than its own NI Group Address(es) by default. |
| 541 | */ |
| 542 | if (!check_nigroup(&p->pktinfo.ipi6_addr)) { |
| 543 | DEBUG(LOG_WARNING, |
| 544 | "Destination is link-local multicast address other than " |
| 545 | "NI Group address.\n"); |
| 546 | ni_free(p); |
| 547 | return -1; |
| 548 | } |
| 549 | #endif |
| 550 | } |
| 551 | |
| 552 | /* Step 1: Check length */ |
| 553 | if (p->querylen < sizeof(struct icmp6_nodeinfo)) { |
| 554 | DEBUG(LOG_WARNING, "Query too short\n"); |
| 555 | ni_free(p); |
| 556 | return -1; |
| 557 | } |
| 558 | |
| 559 | #if ENABLE_DEBUG |
| 560 | cp = printbuf; |
| 561 | for (i = 0; i < sizeof(query->icmp6_ni_nonce); i++) { |
| 562 | cp += sprintf(cp, " %02x", query->icmp6_ni_nonce[i]); |
| 563 | } |
| 564 | DEBUG(LOG_DEBUG, "%s(): qtype=%d, flags=0x%04x, nonce[] = {%s }\n", |
| 565 | __func__, |
| 566 | ntohs(query->ni_qtype), ntohs(query->ni_flags), printbuf); |
| 567 | #endif |
| 568 | |
| 569 | subjlen = p->querylen - sizeof(struct icmp6_nodeinfo); |
| 570 | |
| 571 | /* Step 2: Check Subject Code */ |
| 572 | switch(htons(query->ni_qtype)) { |
| 573 | case NI_QTYPE_NOOP: |
| 574 | case NI_QTYPE_SUPTYPES: |
| 575 | if (query->ni_code != ICMP6_NI_SUBJ_FQDN) { |
| 576 | DEBUG(LOG_WARNING, |
| 577 | "%s(): invalid/unknown code %u\n", |
| 578 | __func__, query->ni_code); |
| 579 | subjlen = 0; |
| 580 | } |
| 581 | subjinfo = &subjinfo_null; |
| 582 | break; |
| 583 | default: |
| 584 | subjinfo = subjinfo_lookup(query->ni_code); |
| 585 | if (!subjinfo) { |
| 586 | DEBUG(LOG_WARNING, |
| 587 | "%s(): unknown code %u\n", |
| 588 | __func__, query->ni_code); |
| 589 | ni_free(p); |
| 590 | return -1; |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | /* Step 3: Lookup Qtype */ |
| 595 | qtypeinfo = qtypeinfo_lookup(ntohs(query->ni_qtype)); |
| 596 | |
| 597 | /* Step 4: Check Subject |
| 598 | * (And fill reply if it is available now) |
| 599 | */ |
| 600 | if (qtypeinfo->getreply == subjinfo->checksubj) |
| 601 | replyonsubjcheck = 1; |
| 602 | |
| 603 | if (subjinfo->checksubj(p, |
| 604 | subject, subjlen, |
| 605 | query->ni_flags, |
| 606 | replyonsubjcheck ? NULL : &subj_if, |
| 607 | replyonsubjcheck)) { |
| 608 | if (p->replydatalen < 0) { |
| 609 | DEBUG(LOG_WARNING, |
| 610 | "failed to make reply: %s\n", |
| 611 | strerror(errno)); |
| 612 | } |
| 613 | ni_free(p); |
| 614 | return -1; |
| 615 | } |
| 616 | |
| 617 | /* XXX: Step 5: Check the policy */ |
| 618 | rc = ni_policy(p); |
| 619 | if (rc <= 0) { |
| 620 | ni_free(p->replydata); |
| 621 | p->replydata = NULL; |
| 622 | p->replydatalen = 0; |
| 623 | if (rc < 0) { |
| 624 | DEBUG(LOG_WARNING, "Ignored by policy.\n"); |
| 625 | ni_free(p); |
| 626 | return -1; |
| 627 | } |
| 628 | DEBUG(LOG_WARNING, "Refused by policy.\n"); |
| 629 | replyonsubjcheck = 0; |
| 630 | qtypeinfo = &qtypeinfo_refused; |
| 631 | } |
| 632 | |
| 633 | /* Step 6: Fill the reply if not yet done */ |
| 634 | if (!replyonsubjcheck) { |
| 635 | if (qtypeinfo->getreply(p, |
| 636 | NULL, 0, |
| 637 | query->ni_flags, |
| 638 | &subj_if, |
| 639 | 1)) { |
| 640 | if (p->replydatalen) { |
| 641 | DEBUG(LOG_WARNING, |
| 642 | "failed to make reply: %s\n", |
| 643 | strerror(errno)); |
| 644 | } |
| 645 | ni_free(p); |
| 646 | return -1; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | /* Step 7: Rate Limit */ |
| 651 | if (qtypeinfo->flags&QTYPEINFO_F_RATELIMIT && |
| 652 | ni_ratelimit()) { |
| 653 | ni_free(p->replydata); |
| 654 | ni_free(p); |
| 655 | return -1; |
| 656 | } |
| 657 | |
| 658 | /* Step 8: Fill Qtype / Nonce */ |
| 659 | p->reply.ni_qtype = query->ni_qtype; |
| 660 | memcpy(p->reply.icmp6_ni_nonce, query->icmp6_ni_nonce, sizeof(p->reply.icmp6_ni_nonce)); |
| 661 | |
| 662 | /* Step 9: Source address selection */ |
| 663 | if (IN6_IS_ADDR_MULTICAST(&p->pktinfo.ipi6_addr)) { |
| 664 | /* if query was sent to multicast address, |
| 665 | * use source address selection in kernel. |
| 666 | * XXX: anycast? |
| 667 | */ |
| 668 | memset(&p->pktinfo.ipi6_addr, 0, sizeof(p->pktinfo.ipi6_addr)); |
| 669 | |
| 670 | /* Random Delay between zero and MAX_ANYCAST_DELAY_TIME is |
| 671 | * required if query was sent to anycast or multicast address. |
| 672 | */ |
| 673 | p->delay = (int) (MAX_ANYCAST_DELAY_TIME*rand()/(RAND_MAX+1.0)); |
| 674 | } else { |
| 675 | p->delay = 0; |
| 676 | } |
| 677 | |
| 678 | /* Step 10: Send the reply |
| 679 | * XXX: with possible random delay */ |
| 680 | #if ENABLE_THREADS && HAVE_LIBPTHREAD |
| 681 | /* ni_send_thread() frees p */ |
| 682 | if (pthread_create(&thread, &pattr, ni_send_thread, p)) { |
| 683 | ni_free(p->replydata); |
| 684 | ni_free(p); |
| 685 | return -1; |
| 686 | } |
| 687 | #else |
| 688 | /* ni_send_fork() frees p */ |
| 689 | if (ni_send_fork(p)) { |
| 690 | ni_free(p->replydata); |
| 691 | ni_free(p); |
| 692 | return -1; |
| 693 | } |
| 694 | #endif |
| 695 | |
| 696 | return 0; |
| 697 | } |
| 698 | |