1 /* $NetBSD: lpd.c,v 1.60 2023/04/26 18:25:02 kre Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 35 #ifndef lint 36 __COPYRIGHT("@(#) Copyright (c) 1983, 1993, 1994\ 37 The Regents of the University of California. All rights reserved."); 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)lpd.c 8.7 (Berkeley) 5/10/95"; 43 #else 44 __RCSID("$NetBSD: lpd.c,v 1.60 2023/04/26 18:25:02 kre Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * lpd -- line printer daemon. 50 * 51 * Listen for a connection and perform the requested operation. 52 * Operations are: 53 * \1printer\n 54 * check the queue for jobs and print any found. 55 * \2printer\n 56 * receive a job from another machine and queue it. 57 * \3printer [users ...] [jobs ...]\n 58 * return the current state of the queue (short form). 59 * \4printer [users ...] [jobs ...]\n 60 * return the current state of the queue (long form). 61 * \5printer person [users ...] [jobs ...]\n 62 * remove jobs from the queue. 63 * 64 * Strategy to maintain protected spooling area: 65 * 1. Spooling area is writable only by daemon and spooling group 66 * 2. lpr runs setuid root and setgrp spooling group; it uses 67 * root to access any file it wants (verifying things before 68 * with an access call) and group id to know how it should 69 * set up ownership of files in the spooling area. 70 * 3. Files in spooling area are owned by root, group spooling 71 * group, with mode 660. 72 * 4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to 73 * access files and printer. Users can't get to anything 74 * w/o help of lpq and lprm programs. 75 */ 76 77 #include <sys/param.h> 78 #include <sys/wait.h> 79 #include <sys/types.h> 80 #include <sys/socket.h> 81 #include <sys/un.h> 82 #include <sys/stat.h> 83 #include <sys/file.h> 84 #include <sys/poll.h> 85 #include <netinet/in.h> 86 87 #include <err.h> 88 #include <netdb.h> 89 #include <unistd.h> 90 #include <syslog.h> 91 #include <signal.h> 92 #include <errno.h> 93 #include <fcntl.h> 94 #include <dirent.h> 95 #include <stdarg.h> 96 #include <stdio.h> 97 #include <stdlib.h> 98 #include <string.h> 99 #include <ctype.h> 100 #include <arpa/inet.h> 101 102 #ifdef LIBWRAP 103 #include <tcpd.h> 104 #endif 105 106 #include "lp.h" 107 #include "lp.local.h" 108 #include "pathnames.h" 109 #include "extern.h" 110 111 /* XXX from libc/net/rcmd.c */ 112 extern int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, 113 const char *, const char *); 114 115 #ifdef LIBWRAP 116 int allow_severity = LOG_AUTH|LOG_INFO; 117 int deny_severity = LOG_AUTH|LOG_WARNING; 118 #endif 119 120 int lflag; /* log requests flag */ 121 int rflag; /* allow of for remote printers */ 122 int sflag; /* secure (no inet) flag */ 123 int from_remote; /* from remote socket */ 124 char **blist; /* list of addresses to bind(2) to */ 125 int blist_size; 126 int blist_addrs; 127 128 static void reapchild(int); 129 __dead static void mcleanup(int); 130 static void doit(void); 131 static void startup(void); 132 static void chkhost(struct sockaddr *, int); 133 __dead static void usage(void); 134 static struct pollfd *socksetup(int, int, const char *, int *); 135 static void chkplushost(int, FILE *, char*); 136 137 uid_t uid, euid; 138 int child_count; 139 140 #define LPD_NOPORTCHK 0001 /* skip reserved-port check */ 141 142 int 143 main(int argc, char **argv) 144 { 145 struct sockaddr_storage frm; 146 socklen_t frmlen; 147 sigset_t nmask, omask; 148 int lfd, errs, i, f, nfds; 149 struct pollfd *socks; 150 int child_max = 32; /* more than enough to hose the system */ 151 int options = 0, check_options = 0; 152 struct servent *sp; 153 const char *port = "printer"; 154 char **newblist; 155 156 euid = geteuid(); /* these shouldn't be different */ 157 uid = getuid(); 158 gethostname(host, sizeof(host)); 159 host[sizeof(host) - 1] = '\0'; 160 setprogname(*argv); 161 162 errs = 0; 163 while ((i = getopt(argc, argv, "b:dln:srw:W")) != -1) 164 switch (i) { 165 case 'b': 166 if (blist_addrs >= blist_size) { 167 newblist = realloc(blist, 168 blist_size + sizeof(char *) * 4); 169 if (newblist == NULL) 170 err(1, "cant allocate bind addr list"); 171 blist = newblist; 172 blist_size += sizeof(char *) * 4; 173 } 174 blist[blist_addrs++] = strdup(optarg); 175 break; 176 case 'd': 177 options |= SO_DEBUG; 178 break; 179 case 'l': 180 lflag++; 181 break; 182 case 'n': 183 child_max = atoi(optarg); 184 if (child_max < 0 || child_max > 1024) 185 errx(1, "invalid number of children: %s", 186 optarg); 187 break; 188 case 'r': 189 rflag++; 190 break; 191 case 's': 192 sflag++; 193 break; 194 case 'w': 195 wait_time = atoi(optarg); 196 if (wait_time < 0) 197 errx(1, "wait time must be positive: %s", 198 optarg); 199 if (wait_time < 30) 200 warnx("warning: wait time less than 30 seconds"); 201 break; 202 case 'W':/* allow connections coming from a non-reserved port */ 203 /* (done by some lpr-implementations for MS-Windows) */ 204 check_options |= LPD_NOPORTCHK; 205 break; 206 default: 207 errs++; 208 } 209 argc -= optind; 210 argv += optind; 211 if (errs) 212 usage(); 213 214 switch (argc) { 215 case 1: 216 if ((i = atoi(argv[0])) == 0) 217 usage(); 218 if (i < 0 || i > USHRT_MAX) 219 errx(1, "port # %d is invalid", i); 220 221 port = argv[0]; 222 break; 223 case 0: 224 sp = getservbyname(port, "tcp"); 225 if (sp == NULL) 226 errx(1, "%s/tcp: unknown service", port); 227 break; 228 default: 229 usage(); 230 } 231 232 #ifndef DEBUG 233 /* 234 * Set up standard environment by detaching from the parent. 235 */ 236 daemon(0, 0); 237 #endif 238 239 openlog("lpd", LOG_PID, LOG_LPR); 240 syslog(LOG_INFO, "restarted"); 241 (void)umask(0); 242 lfd = open(_PATH_MASTERLOCK, O_WRONLY|O_CREAT, 0644); 243 if (lfd < 0) { 244 syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK); 245 exit(1); 246 } 247 if (flock(lfd, LOCK_EX|LOCK_NB) < 0) { 248 if (errno == EWOULDBLOCK) { /* active daemon present */ 249 syslog(LOG_ERR, "%s is locked; another lpd is running", 250 _PATH_MASTERLOCK); 251 exit(0); 252 } 253 syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK); 254 exit(1); 255 } 256 ftruncate(lfd, 0); 257 /* 258 * write process id for others to know 259 */ 260 (void)snprintf(line, sizeof(line), "%u\n", getpid()); 261 f = strlen(line); 262 if (write(lfd, line, f) != f) { 263 syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK); 264 exit(1); 265 } 266 signal(SIGCHLD, reapchild); 267 /* 268 * Restart all the printers. 269 */ 270 startup(); 271 272 sigemptyset(&nmask); 273 sigaddset(&nmask, SIGHUP); 274 sigaddset(&nmask, SIGINT); 275 sigaddset(&nmask, SIGQUIT); 276 sigaddset(&nmask, SIGTERM); 277 sigprocmask(SIG_BLOCK, &nmask, &omask); 278 279 signal(SIGHUP, mcleanup); 280 signal(SIGINT, mcleanup); 281 signal(SIGQUIT, mcleanup); 282 signal(SIGTERM, mcleanup); 283 284 socks = socksetup(PF_UNSPEC, options, port, &nfds); 285 286 sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0); 287 288 if (blist != NULL) { 289 for (i = 0; i < blist_addrs; i++) 290 free(blist[i]); 291 free(blist); 292 } 293 294 /* 295 * Main loop: accept, do a request, continue. 296 */ 297 memset(&frm, 0, sizeof(frm)); 298 for (;;) { 299 int rv, s; 300 /* "short" so it overflows in about 2 hours */ 301 struct timespec sleeptime = {10, 0}; 302 303 while (child_max < child_count) { 304 syslog(LOG_WARNING, 305 "too many children, sleeping for %ld seconds", 306 (long)sleeptime.tv_sec); 307 nanosleep(&sleeptime, NULL); 308 sleeptime.tv_sec <<= 1; 309 if (sleeptime.tv_sec <= 0) { 310 syslog(LOG_CRIT, "sleeptime overflowed! help!"); 311 sleeptime.tv_sec = 10; 312 } 313 } 314 315 rv = poll(socks, nfds, INFTIM); 316 if (rv <= 0) { 317 if (rv < 0 && errno != EINTR) 318 syslog(LOG_WARNING, "poll: %m"); 319 continue; 320 } 321 s = -1; 322 for (i = 0; i < nfds; i++) 323 if (socks[i].revents & POLLIN) { 324 frmlen = sizeof(frm); 325 s = accept(socks[i].fd, 326 (struct sockaddr *)&frm, &frmlen); 327 break; 328 } 329 if (s < 0) { 330 if (errno != EINTR) 331 syslog(LOG_WARNING, "accept: %m"); 332 continue; 333 } 334 335 switch (fork()) { 336 case 0: 337 signal(SIGCHLD, SIG_DFL); 338 signal(SIGHUP, SIG_IGN); 339 signal(SIGINT, SIG_IGN); 340 signal(SIGQUIT, SIG_IGN); 341 signal(SIGTERM, SIG_IGN); 342 for (i = 0; i < nfds; i++) 343 (void)close(socks[i].fd); 344 dup2(s, STDOUT_FILENO); 345 (void)close(s); 346 if (frm.ss_family != AF_LOCAL) { 347 /* for both AF_INET and AF_INET6 */ 348 from_remote = 1; 349 chkhost((struct sockaddr *)&frm, check_options); 350 } else 351 from_remote = 0; 352 doit(); 353 exit(0); 354 case -1: 355 syslog(LOG_WARNING, "fork: %m, sleeping for 10 seconds..."); 356 sleep(10); 357 continue; 358 default: 359 child_count++; 360 } 361 (void)close(s); 362 } 363 } 364 365 /* 366 * If there was a forward/backward name resolution mismatch, check 367 * that there's a '+' entry in fhost. 368 */ 369 370 void 371 chkplushost(int good, FILE *fhost, char *hst) 372 { 373 int c1, c2, c3; 374 375 if (good) { 376 return; 377 } 378 379 rewind(fhost); 380 while (EOF != (c1 = fgetc(fhost))) { 381 if (c1 == '+') { 382 c2 = fgetc(fhost); 383 if (c2 == ' ' || c2 == '\t' || c2 == '\n') { 384 return; 385 } 386 } 387 do { 388 c3 = fgetc(fhost); 389 } while (c3 != EOF && c3 != '\n'); 390 } 391 fatal("address for your hostname (%s) not matched", hst); 392 } 393 394 static void 395 reapchild(int signo) 396 { 397 int status; 398 399 while (wait3(&status, WNOHANG, 0) > 0) 400 child_count--; 401 } 402 403 static void 404 mcleanup(int signo) 405 { 406 if (lflag) 407 syslog(LOG_INFO, "exiting"); 408 unlink(_PATH_SOCKETNAME); 409 exit(0); 410 } 411 412 /* 413 * Stuff for handling job specifications 414 */ 415 char *user[MAXUSERS]; /* users to process */ 416 int users; /* # of users in user array */ 417 int requ[MAXREQUESTS]; /* job number of spool entries */ 418 int requests; /* # of spool requests */ 419 char *person; /* name of person doing lprm */ 420 421 char fromb[NI_MAXHOST]; /* buffer for client's machine name */ 422 char cbuf[BUFSIZ]; /* command line buffer */ 423 const char *cmdnames[] = { 424 "null", 425 "printjob", 426 "recvjob", 427 "displayq short", 428 "displayq long", 429 "rmjob" 430 }; 431 432 static void 433 doit(void) 434 { 435 char *cp; 436 int n; 437 438 for (;;) { 439 cp = cbuf; 440 do { 441 if (cp >= &cbuf[sizeof(cbuf) - 1]) 442 fatal("Command line too long"); 443 if ((n = read(STDOUT_FILENO, cp, 1)) != 1) { 444 if (n < 0) 445 fatal("Lost connection"); 446 return; 447 } 448 } while (*cp++ != '\n'); 449 *--cp = '\0'; 450 cp = cbuf; 451 if (lflag) { 452 if (*cp >= '\1' && *cp <= '\5') { 453 syslog(LOG_INFO, "%s requests %s %s", 454 from, cmdnames[(int)*cp], cp+1); 455 setproctitle("serving %s: %s %s", from, 456 cmdnames[(int)*cp], cp+1); 457 } 458 else 459 syslog(LOG_INFO, "bad request (%d) from %s", 460 *cp, from); 461 } 462 switch (*cp++) { 463 case '\1': /* check the queue and print any jobs there */ 464 printer = cp; 465 if (*printer == '\0') 466 printer = DEFLP; 467 printjob(); 468 break; 469 case '\2': /* receive files to be queued */ 470 if (!from_remote) { 471 syslog(LOG_INFO, "illegal request (%d)", *cp); 472 exit(1); 473 } 474 printer = cp; 475 if (*printer == '\0') 476 printer = DEFLP; 477 recvjob(); 478 break; 479 case '\3': /* display the queue (short form) */ 480 case '\4': /* display the queue (long form) */ 481 printer = cp; 482 if (*printer == '\0') 483 printer = DEFLP; 484 while (*cp) { 485 if (*cp != ' ') { 486 cp++; 487 continue; 488 } 489 *cp++ = '\0'; 490 while (isspace((unsigned char)*cp)) 491 cp++; 492 if (*cp == '\0') 493 break; 494 if (isdigit((unsigned char)*cp)) { 495 if (requests >= MAXREQUESTS) 496 fatal("Too many requests"); 497 requ[requests++] = atoi(cp); 498 } else { 499 if (users >= MAXUSERS) 500 fatal("Too many users"); 501 user[users++] = cp; 502 } 503 } 504 displayq(cbuf[0] - '\3'); 505 exit(0); 506 case '\5': /* remove a job from the queue */ 507 if (!from_remote) { 508 syslog(LOG_INFO, "illegal request (%d)", *cp); 509 exit(1); 510 } 511 printer = cp; 512 if (*printer == '\0') 513 printer = DEFLP; 514 while (*cp && *cp != ' ') 515 cp++; 516 if (!*cp) 517 break; 518 *cp++ = '\0'; 519 person = cp; 520 while (*cp) { 521 if (*cp != ' ') { 522 cp++; 523 continue; 524 } 525 *cp++ = '\0'; 526 while (isspace((unsigned char)*cp)) 527 cp++; 528 if (*cp == '\0') 529 break; 530 if (isdigit((unsigned char)*cp)) { 531 if (requests >= MAXREQUESTS) 532 fatal("Too many requests"); 533 requ[requests++] = atoi(cp); 534 } else { 535 if (users >= MAXUSERS) 536 fatal("Too many users"); 537 user[users++] = cp; 538 } 539 } 540 rmjob(); 541 break; 542 } 543 fatal("Illegal service request"); 544 } 545 } 546 547 /* 548 * Make a pass through the printcap database and start printing any 549 * files left from the last time the machine went down. 550 */ 551 static void 552 startup(void) 553 { 554 char *buf; 555 char *cp; 556 557 /* 558 * Restart the daemons. 559 */ 560 while (cgetnext(&buf, printcapdb) > 0) { 561 if (ckqueue(buf) <= 0) { 562 free(buf); 563 continue; /* no work to do for this printer */ 564 } 565 for (cp = buf; *cp; cp++) 566 if (*cp == '|' || *cp == ':') { 567 *cp = '\0'; 568 break; 569 } 570 if (lflag) 571 syslog(LOG_INFO, "work for %s", buf); 572 switch (fork()) { 573 case -1: 574 syslog(LOG_WARNING, "startup: cannot fork"); 575 mcleanup(0); 576 case 0: 577 printer = buf; 578 setproctitle("working on printer %s", printer); 579 cgetclose(); 580 printjob(); 581 /* NOTREACHED */ 582 default: 583 child_count++; 584 free(buf); 585 } 586 } 587 } 588 589 #define DUMMY ":nobody::" 590 591 /* 592 * Check to see if the from host has access to the line printer. 593 */ 594 static void 595 chkhost(struct sockaddr *f, int check_opts) 596 { 597 struct addrinfo hints, *res, *r; 598 FILE *hostf; 599 int good = 0; 600 char hst[NI_MAXHOST], ip[NI_MAXHOST]; 601 char serv[NI_MAXSERV]; 602 int error; 603 #ifdef LIBWRAP 604 struct request_info req; 605 #endif 606 607 error = getnameinfo(f, f->sa_len, NULL, 0, serv, sizeof(serv), 608 NI_NUMERICSERV); 609 if (error) 610 fatal("Malformed from address: %s", gai_strerror(error)); 611 612 if (!(check_opts & LPD_NOPORTCHK) && 613 atoi(serv) >= IPPORT_RESERVED) 614 fatal("Connect from invalid port (%s)", serv); 615 616 /* Need real hostname for temporary filenames */ 617 error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0, 618 NI_NAMEREQD); 619 if (error) { 620 error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0, 621 NI_NUMERICHOST); 622 if (error) 623 fatal("Host name for your address unknown"); 624 else 625 fatal("Host name for your address (%s) unknown", hst); 626 } 627 628 (void)strlcpy(fromb, hst, sizeof(fromb)); 629 from = fromb; 630 631 /* need address in stringform for comparison (no DNS lookup here) */ 632 error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0, 633 NI_NUMERICHOST); 634 if (error) 635 fatal("Cannot print address"); 636 637 /* Check for spoof, ala rlogind */ 638 good = 0; 639 memset(&hints, 0, sizeof(hints)); 640 hints.ai_family = PF_UNSPEC; 641 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 642 error = getaddrinfo(fromb, NULL, &hints, &res); 643 if (!error) { 644 for (r = res; good == 0 && r; r = r->ai_next) { 645 error = getnameinfo(r->ai_addr, r->ai_addrlen, 646 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 647 if (!error && !strcmp(hst, ip)) 648 good = 1; 649 } 650 if (res) 651 freeaddrinfo(res); 652 } 653 654 /* complain about !good later in chkplushost if needed. */ 655 656 setproctitle("serving %s", from); 657 658 #ifdef LIBWRAP 659 request_init(&req, RQ_DAEMON, "lpd", RQ_CLIENT_SIN, f, 660 RQ_FILE, STDOUT_FILENO, NULL); 661 fromhost(&req); 662 if (!hosts_access(&req)) 663 goto denied; 664 #endif 665 666 hostf = fopen(_PATH_HOSTSEQUIV, "r"); 667 if (hostf) { 668 if (__ivaliduser_sa(hostf, f, f->sa_len, DUMMY, DUMMY) == 0) { 669 chkplushost(good, hostf, hst); 670 (void)fclose(hostf); 671 return; 672 } 673 (void)fclose(hostf); 674 } 675 hostf = fopen(_PATH_HOSTSLPD, "r"); 676 if (hostf) { 677 if (__ivaliduser_sa(hostf, f, f->sa_len, DUMMY, DUMMY) == 0) { 678 chkplushost(good, hostf, hst); 679 (void)fclose(hostf); 680 return; 681 } 682 (void)fclose(hostf); 683 } 684 #ifdef LIBWRAP 685 denied: 686 #endif 687 fatal("Your host does not have line printer access"); 688 /*NOTREACHED*/ 689 } 690 691 692 static void 693 usage(void) 694 { 695 696 (void)fprintf(stderr, 697 "Usage: %s [-dlrsW] [-b bind-address] [-n maxchild] " 698 "[-w maxwait] [port]\n", getprogname()); 699 exit(1); 700 } 701 702 /* setup server socket for specified address family */ 703 /* if af is PF_UNSPEC more than one socket may be returned */ 704 /* the returned list is dynamically allocated, so caller needs to free it */ 705 struct pollfd * 706 socksetup(int af, int options, const char *port, int *nfds) 707 { 708 struct sockaddr_un un; 709 struct addrinfo hints, *res, *r; 710 int error, s, blidx = 0, n; 711 struct pollfd *socks, *newsocks; 712 const int on = 1; 713 714 *nfds = 0; 715 716 socks = malloc(1 * sizeof(socks[0])); 717 if (!socks) { 718 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 719 mcleanup(0); 720 } 721 722 s = socket(AF_LOCAL, SOCK_STREAM, 0); 723 if (s < 0) { 724 syslog(LOG_ERR, "socket(): %m"); 725 exit(1); 726 } 727 memset(&un, 0, sizeof(un)); 728 un.sun_family = AF_LOCAL; 729 strncpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path) - 1); 730 un.sun_len = SUN_LEN(&un); 731 (void)umask(07); 732 (void)unlink(_PATH_SOCKETNAME); 733 if (bind(s, (struct sockaddr *)&un, un.sun_len) < 0) { 734 syslog(LOG_ERR, "bind(): %m"); 735 exit(1); 736 } 737 (void)umask(0); 738 listen(s, 5); 739 socks[*nfds].fd = s; 740 socks[*nfds].events = POLLIN; 741 (*nfds)++; 742 743 if (sflag && !blist_addrs) 744 return (socks); 745 746 do { 747 memset(&hints, 0, sizeof(hints)); 748 hints.ai_flags = AI_PASSIVE; 749 hints.ai_family = af; 750 hints.ai_socktype = SOCK_STREAM; 751 error = getaddrinfo((blist_addrs == 0) ? NULL : blist[blidx], 752 port ? port : "printer", &hints, &res); 753 if (error) { 754 if (blist_addrs) 755 syslog(LOG_ERR, "%s: %s", blist[blidx], 756 gai_strerror(error)); 757 else 758 syslog(LOG_ERR, "%s", gai_strerror(error)); 759 mcleanup(0); 760 } 761 762 /* Count max number of sockets we may open */ 763 for (r = res, n = 0; r; r = r->ai_next, n++) 764 ; 765 newsocks = realloc(socks, (*nfds + n) * sizeof(socks[0])); 766 if (!newsocks) { 767 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 768 mcleanup(0); 769 } 770 socks = newsocks; 771 772 for (r = res; r; r = r->ai_next) { 773 s = socket(r->ai_family, r->ai_socktype, 774 r->ai_protocol); 775 if (s < 0) { 776 syslog(LOG_DEBUG, "socket(): %m"); 777 continue; 778 } 779 if (options & SO_DEBUG) 780 if (setsockopt(s, SOL_SOCKET, SO_DEBUG, 781 &on, sizeof(on)) < 0) { 782 syslog(LOG_ERR, 783 "setsockopt (SO_DEBUG): %m"); 784 close(s); 785 continue; 786 } 787 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &on, 788 sizeof(on)) < 0) { 789 syslog(LOG_ERR, 790 "setsockopt (SO_REUSEPORT): %m"); 791 close(s); 792 continue; 793 } 794 if (r->ai_family == AF_INET6 && setsockopt(s, 795 IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) { 796 syslog(LOG_ERR, 797 "setsockopt (IPV6_V6ONLY): %m"); 798 close(s); 799 continue; 800 } 801 if (bind(s, r->ai_addr, r->ai_addrlen) < 0) { 802 syslog(LOG_DEBUG, "bind(): %m"); 803 close(s); 804 continue; 805 } 806 listen(s, 5); 807 socks[*nfds].fd = s; 808 socks[*nfds].events = POLLIN; 809 (*nfds)++; 810 } 811 812 if (res) 813 freeaddrinfo(res); 814 } while (++blidx < blist_addrs); 815 816 return (socks); 817 } 818
Indexes created Sat Sep 20 22:09:52 GMT 2025