1 /* 2 * xfrd-disk.c - XFR (transfer) Daemon TCP system source file. Read/Write state to disk. 3 * 4 * Copyright (c) 2001-2006, NLnet Labs. All rights reserved. 5 * 6 * See LICENSE for the license. 7 * 8 */ 9 10 #include "config.h" 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <ctype.h> 14 #include <errno.h> 15 #include <sys/stat.h> 16 #include <sys/types.h> 17 #include <unistd.h> 18 #include "xfrd-disk.h" 19 #include "xfrd.h" 20 #include "buffer.h" 21 #include "nsd.h" 22 #include "options.h" 23 24 /* quick tokenizer, reads words separated by whitespace. 25 No quoted strings. Comments are skipped (#... eol). */ 26 static char* 27 xfrd_read_token(FILE* in) 28 { 29 static char buf[4000]; 30 buf[sizeof(buf)-1]=0; 31 while(1) { 32 if(fscanf(in, " %3990s", buf) != 1) 33 return 0; 34 35 if(buf[0] != '#') 36 return buf; 37 38 if(!fgets(buf, sizeof(buf), in)) 39 return 0; 40 } 41 } 42 43 static int 44 xfrd_read_i16(FILE *in, uint16_t* v) 45 { 46 char* p = xfrd_read_token(in); 47 if(!p) 48 return 0; 49 50 *v=atoi(p); 51 return 1; 52 } 53 54 static int 55 xfrd_read_i32(FILE *in, uint32_t* v) 56 { 57 char* p = xfrd_read_token(in); 58 if(!p) 59 return 0; 60 61 *v=atoi(p); 62 return 1; 63 } 64 65 static int 66 xfrd_read_time_t(FILE *in, time_t* v) 67 { 68 char* p = xfrd_read_token(in); 69 if(!p) 70 return 0; 71 72 *v=atol(p); 73 return 1; 74 } 75 76 static int 77 xfrd_read_check_str(FILE* in, const char* str) 78 { 79 char *p = xfrd_read_token(in); 80 if(!p) 81 return 0; 82 83 if(strcmp(p, str) != 0) 84 return 0; 85 86 return 1; 87 } 88 89 static int 90 xfrd_read_state_soa(FILE* in, const char* id_acquired, 91 const char* id, xfrd_soa_t* soa, time_t* soatime) 92 { 93 char *p; 94 95 if(!xfrd_read_check_str(in, id_acquired) || 96 !xfrd_read_time_t(in, soatime)) { 97 return 0; 98 } 99 100 if(*soatime == 0) 101 return 1; 102 103 if(!xfrd_read_check_str(in, id) || 104 !xfrd_read_i16(in, &soa->type) || 105 !xfrd_read_i16(in, &soa->klass) || 106 !xfrd_read_i32(in, &soa->ttl) || 107 !xfrd_read_i16(in, &soa->rdata_count)) 108 { 109 return 0; 110 } 111 112 soa->type = htons(soa->type); 113 soa->klass = htons(soa->klass); 114 soa->ttl = htonl(soa->ttl); 115 soa->rdata_count = htons(soa->rdata_count); 116 117 if(!(p=xfrd_read_token(in)) || 118 !(soa->prim_ns[0] = dname_parse_wire(soa->prim_ns+1, p))) 119 return 0; 120 121 if(!(p=xfrd_read_token(in)) || 122 !(soa->email[0] = dname_parse_wire(soa->email+1, p))) 123 return 0; 124 125 if(!xfrd_read_i32(in, &soa->serial) || 126 !xfrd_read_i32(in, &soa->refresh) || 127 !xfrd_read_i32(in, &soa->retry) || 128 !xfrd_read_i32(in, &soa->expire) || 129 !xfrd_read_i32(in, &soa->minimum)) 130 { 131 return 0; 132 } 133 134 soa->serial = htonl(soa->serial); 135 soa->refresh = htonl(soa->refresh); 136 soa->retry = htonl(soa->retry); 137 soa->expire = htonl(soa->expire); 138 soa->minimum = htonl(soa->minimum); 139 return 1; 140 } 141 142 void 143 xfrd_read_state(struct xfrd_state* xfrd) 144 { 145 const char* statefile = xfrd->nsd->options->xfrdfile; 146 FILE *in; 147 uint32_t filetime = 0; 148 uint32_t numzones, i; 149 region_type *tempregion; 150 151 tempregion = region_create(xalloc, free); 152 if(!tempregion) 153 return; 154 155 in = fopen(statefile, "r"); 156 if(!in) { 157 if(errno != ENOENT) { 158 log_msg(LOG_ERR, "xfrd: Could not open file %s for reading: %s", 159 statefile, strerror(errno)); 160 } else { 161 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: no file %s. refreshing all zones.", 162 statefile)); 163 } 164 region_destroy(tempregion); 165 return; 166 } 167 if(!xfrd_read_check_str(in, XFRD_FILE_MAGIC) || 168 !xfrd_read_check_str(in, "filetime:") || 169 !xfrd_read_i32(in, &filetime) || 170 (time_t)filetime > xfrd_time()+15 || 171 !xfrd_read_check_str(in, "numzones:") || 172 !xfrd_read_i32(in, &numzones)) 173 { 174 log_msg(LOG_ERR, "xfrd: corrupt state file %s dated %d (now=%lld)", 175 statefile, (int)filetime, (long long)xfrd_time()); 176 fclose(in); 177 region_destroy(tempregion); 178 return; 179 } 180 181 for(i=0; i<numzones; i++) { 182 char *p; 183 xfrd_zone_t* zone; 184 const dname_type* dname; 185 uint32_t state, masnum, nextmas, round_num, timeout; 186 xfrd_soa_t soa_nsd_read, soa_disk_read, soa_notified_read; 187 time_t soa_nsd_acquired_read, 188 soa_disk_acquired_read, soa_notified_acquired_read; 189 xfrd_soa_t incoming_soa; 190 time_t incoming_acquired; 191 192 memset(&soa_nsd_read, 0, sizeof(soa_nsd_read)); 193 memset(&soa_disk_read, 0, sizeof(soa_disk_read)); 194 memset(&soa_notified_read, 0, sizeof(soa_notified_read)); 195 196 if(!xfrd_read_check_str(in, "zone:") || 197 !xfrd_read_check_str(in, "name:") || 198 !(p=xfrd_read_token(in)) || 199 !(dname = dname_parse(tempregion, p)) || 200 !xfrd_read_check_str(in, "state:") || 201 !xfrd_read_i32(in, &state) || (state>2) || 202 !xfrd_read_check_str(in, "master:") || 203 !xfrd_read_i32(in, &masnum) || 204 !xfrd_read_check_str(in, "next_master:") || 205 !xfrd_read_i32(in, &nextmas) || 206 !xfrd_read_check_str(in, "round_num:") || 207 !xfrd_read_i32(in, &round_num) || 208 !xfrd_read_check_str(in, "next_timeout:") || 209 !xfrd_read_i32(in, &timeout) || 210 !xfrd_read_state_soa(in, "soa_nsd_acquired:", "soa_nsd:", 211 &soa_nsd_read, &soa_nsd_acquired_read) || 212 !xfrd_read_state_soa(in, "soa_disk_acquired:", "soa_disk:", 213 &soa_disk_read, &soa_disk_acquired_read) || 214 !xfrd_read_state_soa(in, "soa_notify_acquired:", "soa_notify:", 215 &soa_notified_read, &soa_notified_acquired_read)) 216 { 217 log_msg(LOG_ERR, "xfrd: corrupt state file %s dated %d (now=%lld)", 218 statefile, (int)filetime, (long long)xfrd_time()); 219 fclose(in); 220 region_destroy(tempregion); 221 return; 222 } 223 224 zone = (xfrd_zone_t*)rbtree_search(xfrd->zones, dname); 225 if(!zone) { 226 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: state file has info for not configured zone %s", p)); 227 continue; 228 } 229 230 if(soa_nsd_acquired_read>xfrd_time()+15 || 231 soa_disk_acquired_read>xfrd_time()+15 || 232 soa_notified_acquired_read>xfrd_time()+15) 233 { 234 log_msg(LOG_ERR, "xfrd: statefile %s contains" 235 " times in the future for zone %s. Ignoring.", 236 statefile, zone->apex_str); 237 continue; 238 } 239 zone->state = state; 240 zone->master_num = masnum; 241 zone->next_master = nextmas; 242 zone->round_num = round_num; 243 zone->timeout.tv_sec = timeout; 244 zone->timeout.tv_usec = 0; 245 246 /* read the zone OK, now set the master properly */ 247 zone->master = acl_find_num(zone->zone_options->pattern-> 248 request_xfr, zone->master_num); 249 if(!zone->master) { 250 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: masters changed for zone %s", 251 zone->apex_str)); 252 zone->master = zone->zone_options->pattern->request_xfr; 253 zone->master_num = 0; 254 zone->round_num = 0; 255 } 256 257 /* 258 * There is no timeout, 259 * or there is a notification, 260 * or there is a soa && current time is past refresh point 261 */ 262 if(timeout == 0 || soa_notified_acquired_read != 0 || 263 (soa_disk_acquired_read != 0 && 264 (uint32_t)xfrd_time() - soa_disk_acquired_read 265 > ntohl(soa_disk_read.refresh))) 266 { 267 zone->state = xfrd_zone_refreshing; 268 xfrd_set_refresh_now(zone); 269 } 270 271 /* There is a soa && current time is past expiry point */ 272 if(soa_disk_acquired_read!=0 && 273 (uint32_t)xfrd_time() - soa_disk_acquired_read 274 > ntohl(soa_disk_read.expire)) 275 { 276 zone->state = xfrd_zone_expired; 277 xfrd_set_refresh_now(zone); 278 } 279 280 /* handle as an incoming SOA. */ 281 incoming_soa = zone->soa_nsd; 282 incoming_acquired = zone->soa_nsd_acquired; 283 zone->soa_nsd = soa_nsd_read; 284 zone->soa_disk = soa_disk_read; 285 zone->soa_notified = soa_notified_read; 286 zone->soa_nsd_acquired = soa_nsd_acquired_read; 287 /* we had better use what we got from starting NSD, not 288 * what we store in this file, because the actual zone 289 * contents trumps the contents of this cache */ 290 /* zone->soa_disk_acquired = soa_disk_acquired_read; */ 291 zone->soa_notified_acquired = soa_notified_acquired_read; 292 xfrd_handle_incoming_soa(zone, &incoming_soa, incoming_acquired); 293 } 294 295 if(!xfrd_read_check_str(in, XFRD_FILE_MAGIC)) { 296 log_msg(LOG_ERR, "xfrd: corrupt state file %s dated %d (now=%lld)", 297 statefile, (int)filetime, (long long)xfrd_time()); 298 region_destroy(tempregion); 299 fclose(in); 300 return; 301 } 302 303 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: read %d zones from state file", (int)numzones)); 304 fclose(in); 305 region_destroy(tempregion); 306 } 307 308 /* prints neato days hours and minutes. */ 309 static void 310 neato_timeout(FILE* out, const char* str, time_t secs) 311 { 312 fprintf(out, "%s", str); 313 if(secs <= 0) { 314 fprintf(out, " %llds", (long long)secs); 315 return; 316 } 317 if(secs >= 3600*24) { 318 fprintf(out, " %lldd", (long long)(secs/(3600*24))); 319 secs = secs % (3600*24); 320 } 321 if(secs >= 3600) { 322 fprintf(out, " %lldh", (long long)(secs/3600)); 323 secs = secs%3600; 324 } 325 if(secs >= 60) { 326 fprintf(out, " %lldm", (long long)(secs/60)); 327 secs = secs%60; 328 } 329 if(secs > 0) { 330 fprintf(out, " %llds", (long long)secs); 331 } 332 } 333 334 static void xfrd_write_dname(FILE* out, uint8_t* dname) 335 { 336 uint8_t* d= dname+1; 337 uint8_t len = *d++; 338 uint8_t i; 339 340 if(dname[0]<=1) { 341 fprintf(out, "."); 342 return; 343 } 344 345 while(len) 346 { 347 assert(d - (dname+1) <= dname[0]); 348 for(i=0; i<len; i++) 349 { 350 uint8_t ch = *d++; 351 if (isalnum(ch) || ch == '-' || ch == '_') { 352 fprintf(out, "%c", ch); 353 } else if (ch == '.' || ch == '\\') { 354 fprintf(out, "\\%c", ch); 355 } else { 356 fprintf(out, "\\%03u", (unsigned int)ch); 357 } 358 } 359 fprintf(out, "."); 360 len = *d++; 361 } 362 } 363 364 static void 365 xfrd_write_state_soa(FILE* out, const char* id, 366 xfrd_soa_t* soa, time_t soatime, const dname_type* ATTR_UNUSED(apex)) 367 { 368 fprintf(out, "\t%s_acquired: %d", id, (int)soatime); 369 if(!soatime) { 370 fprintf(out, "\n"); 371 return; 372 } 373 neato_timeout(out, "\t# was", xfrd_time()-soatime); 374 fprintf(out, " ago\n"); 375 376 fprintf(out, "\t%s: %u %u %u %u", id, 377 (unsigned)ntohs(soa->type), (unsigned)ntohs(soa->klass), 378 (unsigned)ntohl(soa->ttl), (unsigned)ntohs(soa->rdata_count)); 379 fprintf(out, " "); 380 xfrd_write_dname(out, soa->prim_ns); 381 fprintf(out, " "); 382 xfrd_write_dname(out, soa->email); 383 fprintf(out, " %u", (unsigned)ntohl(soa->serial)); 384 fprintf(out, " %u", (unsigned)ntohl(soa->refresh)); 385 fprintf(out, " %u", (unsigned)ntohl(soa->retry)); 386 fprintf(out, " %u", (unsigned)ntohl(soa->expire)); 387 fprintf(out, " %u\n", (unsigned)ntohl(soa->minimum)); 388 fprintf(out, "\t#"); 389 neato_timeout(out, " refresh =", ntohl(soa->refresh)); 390 neato_timeout(out, " retry =", ntohl(soa->retry)); 391 neato_timeout(out, " expire =", ntohl(soa->expire)); 392 neato_timeout(out, " minimum =", ntohl(soa->minimum)); 393 fprintf(out, "\n"); 394 } 395 396 void 397 xfrd_write_state(struct xfrd_state* xfrd) 398 { 399 rbnode_t* p; 400 const char* statefile = xfrd->nsd->options->xfrdfile; 401 FILE *out; 402 time_t now = xfrd_time(); 403 404 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: write file %s", statefile)); 405 out = fopen(statefile, "w"); 406 if(!out) { 407 log_msg(LOG_ERR, "xfrd: Could not open file %s for writing: %s", 408 statefile, strerror(errno)); 409 return; 410 } 411 412 fprintf(out, "%s\n", XFRD_FILE_MAGIC); 413 fprintf(out, "# This file is written on exit by nsd xfr daemon.\n"); 414 fprintf(out, "# This file contains slave zone information:\n"); 415 fprintf(out, "# * timeouts (when was zone data acquired)\n"); 416 fprintf(out, "# * state (OK, refreshing, expired)\n"); 417 fprintf(out, "# * which master transfer to attempt next\n"); 418 fprintf(out, "# The file is read on start (but not on reload) by nsd xfr daemon.\n"); 419 fprintf(out, "# You can edit; but do not change statement order\n"); 420 fprintf(out, "# and no fancy stuff (like quoted \"strings\").\n"); 421 fprintf(out, "#\n"); 422 fprintf(out, "# If you remove a zone entry, it will be refreshed.\n"); 423 fprintf(out, "# This can be useful for an expired zone; it revives\n"); 424 fprintf(out, "# the zone temporarily, from refresh-expiry time.\n"); 425 fprintf(out, "# If you delete the file all slave zones are updated.\n"); 426 fprintf(out, "#\n"); 427 fprintf(out, "# Note: if you edit this file while nsd is running,\n"); 428 fprintf(out, "# it will be overwritten on exit by nsd.\n"); 429 fprintf(out, "\n"); 430 fprintf(out, "filetime: %lld\t# %s\n", (long long)now, ctime(&now)); 431 fprintf(out, "# The number of zone entries in this file\n"); 432 fprintf(out, "numzones: %d\n", (int)xfrd->zones->count); 433 fprintf(out, "\n"); 434 for(p = rbtree_first(xfrd->zones); p && p!=RBTREE_NULL; p=rbtree_next(p)) 435 { 436 xfrd_zone_t* zone = (xfrd_zone_t*)p; 437 fprintf(out, "zone: \tname: %s\n", zone->apex_str); 438 fprintf(out, "\tstate: %d", (int)zone->state); 439 fprintf(out, " # %s", zone->state==xfrd_zone_ok?"OK":( 440 zone->state==xfrd_zone_refreshing?"refreshing":"expired")); 441 fprintf(out, "\n"); 442 fprintf(out, "\tmaster: %d\n", zone->master_num); 443 fprintf(out, "\tnext_master: %d\n", zone->next_master); 444 fprintf(out, "\tround_num: %d\n", zone->round_num); 445 fprintf(out, "\tnext_timeout: %d", 446 (zone->zone_handler_flags&EV_TIMEOUT)?(int)zone->timeout.tv_sec:0); 447 if((zone->zone_handler_flags&EV_TIMEOUT)) { 448 neato_timeout(out, "\t# =", zone->timeout.tv_sec); 449 } 450 fprintf(out, "\n"); 451 xfrd_write_state_soa(out, "soa_nsd", &zone->soa_nsd, 452 zone->soa_nsd_acquired, zone->apex); 453 xfrd_write_state_soa(out, "soa_disk", &zone->soa_disk, 454 zone->soa_disk_acquired, zone->apex); 455 xfrd_write_state_soa(out, "soa_notify", &zone->soa_notified, 456 zone->soa_notified_acquired, zone->apex); 457 fprintf(out, "\n"); 458 } 459 460 fprintf(out, "%s\n", XFRD_FILE_MAGIC); 461 DEBUG(DEBUG_XFRD,1, (LOG_INFO, "xfrd: written %d zones to state file", 462 (int)xfrd->zones->count)); 463 fclose(out); 464 } 465 466 /* return tempdirname */ 467 static void 468 tempdirname(char* buf, size_t sz, struct nsd* nsd) 469 { 470 snprintf(buf, sz, "%snsd-xfr-%d", 471 nsd->options->xfrdir, (int)nsd->pid); 472 } 473 474 void 475 xfrd_make_tempdir(struct nsd* nsd) 476 { 477 char tnm[1024]; 478 tempdirname(tnm, sizeof(tnm), nsd); 479 /* create parent directories if needed (0750 permissions) */ 480 if(!create_dirs(tnm)) { 481 log_msg(LOG_ERR, "parentdirs of %s failed", tnm); 482 } 483 /* restrictive permissions here, because this may be in /tmp */ 484 if(mkdir(tnm, 0700)==-1) { 485 if(errno != EEXIST) { 486 log_msg(LOG_ERR, "mkdir %s failed: %s", 487 tnm, strerror(errno)); 488 } 489 } 490 } 491 492 void 493 xfrd_del_tempdir(struct nsd* nsd) 494 { 495 char tnm[1024]; 496 tempdirname(tnm, sizeof(tnm), nsd); 497 /* ignore parent directories, they are likely /var/tmp, /tmp or 498 * /var/cache/nsd and do not have to be deleted */ 499 if(rmdir(tnm)==-1 && errno != ENOENT) { 500 log_msg(LOG_WARNING, "rmdir %s failed: %s", tnm, 501 strerror(errno)); 502 } 503 } 504 505 /* return name of xfrfile in tempdir */ 506 static void 507 tempxfrname(char* buf, size_t sz, struct nsd* nsd, uint64_t number) 508 { 509 char tnm[1024]; 510 tempdirname(tnm, sizeof(tnm), nsd); 511 snprintf(buf, sz, "%s/xfr.%lld", tnm, (long long)number); 512 } 513 514 FILE* 515 xfrd_open_xfrfile(struct nsd* nsd, uint64_t number, char* mode) 516 { 517 char fname[1024]; 518 FILE* xfr; 519 tempxfrname(fname, sizeof(fname), nsd, number); 520 xfr = fopen(fname, mode); 521 if(!xfr && errno == ENOENT) { 522 /* directory may not exist */ 523 xfrd_make_tempdir(nsd); 524 xfr = fopen(fname, mode); 525 } 526 if(!xfr) { 527 log_msg(LOG_ERR, "open %s for %s failed: %s", fname, mode, 528 strerror(errno)); 529 return NULL; 530 } 531 return xfr; 532 } 533 534 void 535 xfrd_unlink_xfrfile(struct nsd* nsd, uint64_t number) 536 { 537 char fname[1024]; 538 tempxfrname(fname, sizeof(fname), nsd, number); 539 if(unlink(fname) == -1) { 540 log_msg(LOG_WARNING, "could not unlink %s: %s", fname, 541 strerror(errno)); 542 } 543 } 544