1 /*
2 * HTTP address list routines for CUPS.
3 *
4 * Copyright 2007-2017 by Apple Inc.
5 * Copyright 1997-2007 by Easy Software Products, all rights reserved.
6 *
7 * These coded instructions, statements, and computer programs are the
8 * property of Apple Inc. and are protected by Federal copyright
9 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
10 * which should have been included with this file. If this file is
11 * missing or damaged, see the license at "http://www.cups.org/".
12 *
13 * This file is subject to the Apple OS-Developed Software exception.
14 */
15
16 /*
17 * Include necessary headers...
18 */
19
20 #include "cups-private.h"
21 #ifdef HAVE_RESOLV_H
22 # include <resolv.h>
23 #endif /* HAVE_RESOLV_H */
24 #ifdef HAVE_POLL
25 # include <poll.h>
26 #endif /* HAVE_POLL */
27 #ifndef WIN32
28 # include <fcntl.h>
29 #endif /* WIN32 */
30
31
32 /*
33 * 'httpAddrConnect()' - Connect to any of the addresses in the list.
34 *
35 * @since CUPS 1.2/macOS 10.5@ @exclude all@
36 */
37
38 http_addrlist_t * /* O - Connected address or NULL on failure */
httpAddrConnect(http_addrlist_t * addrlist,int * sock)39 httpAddrConnect(
40 http_addrlist_t *addrlist, /* I - List of potential addresses */
41 int *sock) /* O - Socket */
42 {
43 DEBUG_printf(("httpAddrConnect(addrlist=%p, sock=%p)", (void *)addrlist, (void *)sock));
44
45 return (httpAddrConnect2(addrlist, sock, 30000, NULL));
46 }
47
48
49 /*
50 * 'httpAddrConnect2()' - Connect to any of the addresses in the list with a
51 * timeout and optional cancel.
52 *
53 * @since CUPS 1.7/macOS 10.9@
54 */
55
56 http_addrlist_t * /* O - Connected address or NULL on failure */
httpAddrConnect2(http_addrlist_t * addrlist,int * sock,int msec,int * cancel)57 httpAddrConnect2(
58 http_addrlist_t *addrlist, /* I - List of potential addresses */
59 int *sock, /* O - Socket */
60 int msec, /* I - Timeout in milliseconds */
61 int *cancel) /* I - Pointer to "cancel" variable */
62 {
63 int val; /* Socket option value */
64 #ifndef WIN32
65 int flags; /* Socket flags */
66 #endif /* !WIN32 */
67 int remaining; /* Remaining timeout */
68 int i, j, /* Looping vars */
69 nfds, /* Number of file descriptors */
70 fds[100], /* Socket file descriptors */
71 result; /* Result from select() or poll() */
72 http_addrlist_t *addrs[100]; /* Addresses */
73 #ifndef HAVE_POLL
74 int max_fd = -1; /* Highest file descriptor */
75 #endif /* !HAVE_POLL */
76 #ifdef O_NONBLOCK
77 # ifdef HAVE_POLL
78 struct pollfd pfds[100]; /* Polled file descriptors */
79 # else
80 fd_set input_set, /* select() input set */
81 output_set, /* select() output set */
82 error_set; /* select() error set */
83 struct timeval timeout; /* Timeout */
84 # endif /* HAVE_POLL */
85 #endif /* O_NONBLOCK */
86 #ifdef DEBUG
87 socklen_t len; /* Length of value */
88 http_addr_t peer; /* Peer address */
89 char temp[256]; /* Temporary address string */
90 #endif /* DEBUG */
91
92
93 DEBUG_printf(("httpAddrConnect2(addrlist=%p, sock=%p, msec=%d, cancel=%p)", (void *)addrlist, (void *)sock, msec, (void *)cancel));
94
95 if (!sock)
96 {
97 errno = EINVAL;
98 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
99 return (NULL);
100 }
101
102 if (cancel && *cancel)
103 return (NULL);
104
105 if (msec <= 0)
106 msec = INT_MAX;
107
108 /*
109 * Loop through each address until we connect or run out of addresses...
110 */
111
112 nfds = 0;
113 remaining = msec;
114
115 while (remaining > 0)
116 {
117 if (cancel && *cancel)
118 {
119 while (nfds > 0)
120 {
121 nfds --;
122 httpAddrClose(NULL, fds[nfds]);
123 }
124
125 return (NULL);
126 }
127
128 if (addrlist && nfds < (int)(sizeof(fds) / sizeof(fds[0])))
129 {
130 /*
131 * Create the socket...
132 */
133
134 DEBUG_printf(("2httpAddrConnect2: Trying %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
135
136 if ((fds[nfds] = (int)socket(httpAddrFamily(&(addrlist->addr)), SOCK_STREAM, 0)) < 0)
137 {
138 /*
139 * Don't abort yet, as this could just be an issue with the local
140 * system not being configured with IPv4/IPv6/domain socket enabled.
141 *
142 * Just skip this address...
143 */
144
145 addrlist = addrlist->next;
146 continue;
147 }
148
149 /*
150 * Set options...
151 */
152
153 val = 1;
154 setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
155
156 #ifdef SO_REUSEPORT
157 val = 1;
158 setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEPORT, CUPS_SOCAST &val, sizeof(val));
159 #endif /* SO_REUSEPORT */
160
161 #ifdef SO_NOSIGPIPE
162 val = 1;
163 setsockopt(fds[nfds], SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
164 #endif /* SO_NOSIGPIPE */
165
166 /*
167 * Using TCP_NODELAY improves responsiveness, especially on systems
168 * with a slow loopback interface...
169 */
170
171 val = 1;
172 setsockopt(fds[nfds], IPPROTO_TCP, TCP_NODELAY, CUPS_SOCAST &val, sizeof(val));
173
174 #ifdef FD_CLOEXEC
175 /*
176 * Close this socket when starting another process...
177 */
178
179 fcntl(fds[nfds], F_SETFD, FD_CLOEXEC);
180 #endif /* FD_CLOEXEC */
181
182 #ifdef O_NONBLOCK
183 /*
184 * Do an asynchronous connect by setting the socket non-blocking...
185 */
186
187 DEBUG_printf(("httpAddrConnect2: Setting non-blocking connect()"));
188
189 flags = fcntl(fds[nfds], F_GETFL, 0);
190 fcntl(fds[nfds], F_SETFL, flags | O_NONBLOCK);
191 #endif /* O_NONBLOCK */
192
193 /*
194 * Then connect...
195 */
196
197 if (!connect(fds[nfds], &(addrlist->addr.addr), (socklen_t)httpAddrLength(&(addrlist->addr))))
198 {
199 DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
200
201 #ifdef O_NONBLOCK
202 fcntl(fds[nfds], F_SETFL, flags);
203 #endif /* O_NONBLOCK */
204
205 *sock = fds[nfds];
206
207 while (nfds > 0)
208 {
209 nfds --;
210 httpAddrClose(NULL, fds[nfds]);
211 }
212
213 return (addrlist);
214 }
215
216 #ifdef WIN32
217 if (WSAGetLastError() != WSAEINPROGRESS && WSAGetLastError() != WSAEWOULDBLOCK)
218 #else
219 if (errno != EINPROGRESS && errno != EWOULDBLOCK)
220 #endif /* WIN32 */
221 {
222 DEBUG_printf(("1httpAddrConnect2: Unable to connect to %s:%d: %s", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr)), strerror(errno)));
223 httpAddrClose(NULL, fds[nfds]);
224 addrlist = addrlist->next;
225 continue;
226 }
227
228 #ifndef WIN32
229 fcntl(fds[nfds], F_SETFL, flags);
230 #endif /* !WIN32 */
231
232 #ifndef HAVE_POLL
233 if (fds[nfds] > max_fd)
234 max_fd = fds[nfds];
235 #endif /* !HAVE_POLL */
236
237 addrs[nfds] = addrlist;
238 nfds ++;
239 addrlist = addrlist->next;
240 }
241
242 if (!addrlist && nfds == 0)
243 break;
244
245 /*
246 * See if we can connect to any of the addresses so far...
247 */
248
249 #ifdef O_NONBLOCK
250 DEBUG_puts("1httpAddrConnect2: Finishing async connect()");
251
252 do
253 {
254 if (cancel && *cancel)
255 {
256 /*
257 * Close this socket and return...
258 */
259
260 DEBUG_puts("1httpAddrConnect2: Canceled connect()");
261
262 while (nfds > 0)
263 {
264 nfds --;
265 httpAddrClose(NULL, fds[nfds]);
266 }
267
268 *sock = -1;
269
270 return (NULL);
271 }
272
273 # ifdef HAVE_POLL
274 for (i = 0; i < nfds; i ++)
275 {
276 pfds[i].fd = fds[i];
277 pfds[i].events = POLLIN | POLLOUT;
278 }
279
280 result = poll(pfds, (nfds_t)nfds, addrlist ? 100 : remaining > 250 ? 250 : remaining);
281
282 DEBUG_printf(("1httpAddrConnect2: poll() returned %d (%d)", result, errno));
283
284 # else
285 FD_ZERO(&input_set);
286 for (i = 0; i < nfds; i ++)
287 FD_SET(fds[i], &input_set);
288 output_set = input_set;
289 error_set = input_set;
290
291 timeout.tv_sec = 0;
292 timeout.tv_usec = (addrlist ? 100 : remaining > 250 ? 250 : remaining) * 1000;
293
294 result = select(max_fd + 1, &input_set, &output_set, &error_set, &timeout);
295
296 DEBUG_printf(("1httpAddrConnect2: select() returned %d (%d)", result, errno));
297 # endif /* HAVE_POLL */
298 }
299 # ifdef WIN32
300 while (result < 0 && (WSAGetLastError() == WSAEINTR || WSAGetLastError() == WSAEWOULDBLOCK));
301 # else
302 while (result < 0 && (errno == EINTR || errno == EAGAIN));
303 # endif /* WIN32 */
304
305 if (result > 0)
306 {
307 http_addrlist_t *connaddr = NULL; /* Connected address, if any */
308
309 for (i = 0; i < nfds; i ++)
310 {
311 # ifdef HAVE_POLL
312 DEBUG_printf(("pfds[%d].revents=%x\n", i, pfds[i].revents));
313 if (pfds[i].revents && !(pfds[i].revents & (POLLERR | POLLHUP)))
314 # else
315 if (FD_ISSET(fds[i], &input_set) && !FD_ISSET(fds[i], &error_set))
316 # endif /* HAVE_POLL */
317 {
318 *sock = fds[i];
319 connaddr = addrs[i];
320
321 # ifdef DEBUG
322 len = sizeof(peer);
323 if (!getpeername(fds[i], (struct sockaddr *)&peer, &len))
324 DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&peer, temp, sizeof(temp)), httpAddrPort(&peer)));
325 # endif /* DEBUG */
326
327 break;
328 }
329 # ifdef HAVE_POLL
330 else if (pfds[i].revents & (POLLERR | POLLHUP))
331 # else
332 else if (FD_ISSET(fds[i], &error_set))
333 # endif /* HAVE_POLL */
334 {
335 /*
336 * Error on socket, remove from the "pool"...
337 */
338
339 httpAddrClose(NULL, fds[i]);
340 nfds --;
341 if (i < nfds)
342 {
343 memmove(fds + i, fds + i + 1, (size_t)(nfds - i) * (sizeof(fds[0])));
344 memmove(addrs + i, addrs + i + 1, (size_t)(nfds - i) * (sizeof(addrs[0])));
345 }
346 i --;
347 }
348 }
349
350 if (connaddr)
351 {
352 /*
353 * Connected on one address, close all of the other sockets we have so
354 * far and return...
355 */
356
357 for (j = 0; j < i; j ++)
358 httpAddrClose(NULL, fds[j]);
359
360 for (j ++; j < nfds; j ++)
361 httpAddrClose(NULL, fds[j]);
362
363 return (connaddr);
364 }
365 }
366 #endif /* O_NONBLOCK */
367
368 if (addrlist)
369 remaining -= 100;
370 else
371 remaining -= 250;
372 }
373
374 while (nfds > 0)
375 {
376 nfds --;
377 httpAddrClose(NULL, fds[nfds]);
378 }
379
380 #ifdef WIN32
381 _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, "Connection failed", 0);
382 #else
383 _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, strerror(errno), 0);
384 #endif /* WIN32 */
385
386 return (NULL);
387 }
388
389
390 /*
391 * 'httpAddrCopyList()' - Copy an address list.
392 *
393 * @since CUPS 1.7/macOS 10.9@
394 */
395
396 http_addrlist_t * /* O - New address list or @code NULL@ on error */
httpAddrCopyList(http_addrlist_t * src)397 httpAddrCopyList(
398 http_addrlist_t *src) /* I - Source address list */
399 {
400 http_addrlist_t *dst = NULL, /* First list entry */
401 *prev = NULL, /* Previous list entry */
402 *current = NULL;/* Current list entry */
403
404
405 while (src)
406 {
407 if ((current = malloc(sizeof(http_addrlist_t))) == NULL)
408 {
409 current = dst;
410
411 while (current)
412 {
413 prev = current;
414 current = current->next;
415
416 free(prev);
417 }
418
419 return (NULL);
420 }
421
422 memcpy(current, src, sizeof(http_addrlist_t));
423
424 current->next = NULL;
425
426 if (prev)
427 prev->next = current;
428 else
429 dst = current;
430
431 prev = current;
432 src = src->next;
433 }
434
435 return (dst);
436 }
437
438
439 /*
440 * 'httpAddrFreeList()' - Free an address list.
441 *
442 * @since CUPS 1.2/macOS 10.5@
443 */
444
445 void
httpAddrFreeList(http_addrlist_t * addrlist)446 httpAddrFreeList(
447 http_addrlist_t *addrlist) /* I - Address list to free */
448 {
449 http_addrlist_t *next; /* Next address in list */
450
451
452 /*
453 * Free each address in the list...
454 */
455
456 while (addrlist)
457 {
458 next = addrlist->next;
459
460 free(addrlist);
461
462 addrlist = next;
463 }
464 }
465
466
467 /*
468 * 'httpAddrGetList()' - Get a list of addresses for a hostname.
469 *
470 * @since CUPS 1.2/macOS 10.5@
471 */
472
473 http_addrlist_t * /* O - List of addresses or NULL */
httpAddrGetList(const char * hostname,int family,const char * service)474 httpAddrGetList(const char *hostname, /* I - Hostname, IP address, or NULL for passive listen address */
475 int family, /* I - Address family or AF_UNSPEC */
476 const char *service) /* I - Service name or port number */
477 {
478 http_addrlist_t *first, /* First address in list */
479 *addr, /* Current address in list */
480 *temp; /* New address */
481 _cups_globals_t *cg = _cupsGlobals();
482 /* Global data */
483
484
485 #ifdef DEBUG
486 _cups_debug_printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, "
487 "service=\"%s\")\n",
488 hostname ? hostname : "(nil)",
489 family == AF_UNSPEC ? "UNSPEC" :
490 # ifdef AF_LOCAL
491 family == AF_LOCAL ? "LOCAL" :
492 # endif /* AF_LOCAL */
493 # ifdef AF_INET6
494 family == AF_INET6 ? "INET6" :
495 # endif /* AF_INET6 */
496 family == AF_INET ? "INET" : "???", service);
497 #endif /* DEBUG */
498
499 #ifdef HAVE_RES_INIT
500 /*
501 * STR #2920: Initialize resolver after failure in cups-polld
502 *
503 * If the previous lookup failed, re-initialize the resolver to prevent
504 * temporary network errors from persisting. This *should* be handled by
505 * the resolver libraries, but apparently the glibc folks do not agree.
506 *
507 * We set a flag at the end of this function if we encounter an error that
508 * requires reinitialization of the resolver functions. We then call
509 * res_init() if the flag is set on the next call here or in httpAddrLookup().
510 */
511
512 if (cg->need_res_init)
513 {
514 res_init();
515
516 cg->need_res_init = 0;
517 }
518 #endif /* HAVE_RES_INIT */
519
520 /*
521 * Lookup the address the best way we can...
522 */
523
524 first = addr = NULL;
525
526 #ifdef AF_LOCAL
527 if (hostname && hostname[0] == '/')
528 {
529 /*
530 * Domain socket address...
531 */
532
533 if ((first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t))) != NULL)
534 {
535 addr = first;
536 first->addr.un.sun_family = AF_LOCAL;
537 strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path));
538 }
539 }
540 else
541 #endif /* AF_LOCAL */
542 if (!hostname || _cups_strcasecmp(hostname, "localhost"))
543 {
544 #ifdef HAVE_GETADDRINFO
545 struct addrinfo hints, /* Address lookup hints */
546 *results, /* Address lookup results */
547 *current; /* Current result */
548 char ipv6[64], /* IPv6 address */
549 *ipv6zone; /* Pointer to zone separator */
550 int ipv6len; /* Length of IPv6 address */
551 int error; /* getaddrinfo() error */
552
553
554 /*
555 * Lookup the address as needed...
556 */
557
558 memset(&hints, 0, sizeof(hints));
559 hints.ai_family = family;
560 hints.ai_flags = hostname ? 0 : AI_PASSIVE;
561 hints.ai_socktype = SOCK_STREAM;
562
563 if (hostname && *hostname == '[')
564 {
565 /*
566 * Remove brackets from numeric IPv6 address...
567 */
568
569 if (!strncmp(hostname, "[v1.", 4))
570 {
571 /*
572 * Copy the newer address format which supports link-local addresses...
573 */
574
575 strlcpy(ipv6, hostname + 4, sizeof(ipv6));
576 if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
577 {
578 ipv6[ipv6len] = '\0';
579 hostname = ipv6;
580
581 /*
582 * Convert "+zone" in address to "%zone"...
583 */
584
585 if ((ipv6zone = strrchr(ipv6, '+')) != NULL)
586 *ipv6zone = '%';
587 }
588 }
589 else
590 {
591 /*
592 * Copy the regular non-link-local IPv6 address...
593 */
594
595 strlcpy(ipv6, hostname + 1, sizeof(ipv6));
596 if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
597 {
598 ipv6[ipv6len] = '\0';
599 hostname = ipv6;
600 }
601 }
602 }
603
604 if ((error = getaddrinfo(hostname, service, &hints, &results)) == 0)
605 {
606 /*
607 * Copy the results to our own address list structure...
608 */
609
610 for (current = results; current; current = current->ai_next)
611 if (current->ai_family == AF_INET || current->ai_family == AF_INET6)
612 {
613 /*
614 * Copy the address over...
615 */
616
617 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
618 if (!temp)
619 {
620 httpAddrFreeList(first);
621 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
622 return (NULL);
623 }
624
625 if (current->ai_family == AF_INET6)
626 memcpy(&(temp->addr.ipv6), current->ai_addr,
627 sizeof(temp->addr.ipv6));
628 else
629 memcpy(&(temp->addr.ipv4), current->ai_addr,
630 sizeof(temp->addr.ipv4));
631
632 /*
633 * Append the address to the list...
634 */
635
636 if (!first)
637 first = temp;
638
639 if (addr)
640 addr->next = temp;
641
642 addr = temp;
643 }
644
645 /*
646 * Free the results from getaddrinfo()...
647 */
648
649 freeaddrinfo(results);
650 }
651 else
652 {
653 if (error == EAI_FAIL)
654 cg->need_res_init = 1;
655
656 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gai_strerror(error), 0);
657 }
658
659 #else
660 if (hostname)
661 {
662 int i; /* Looping vars */
663 unsigned ip[4]; /* IPv4 address components */
664 const char *ptr; /* Pointer into hostname */
665 struct hostent *host; /* Result of lookup */
666 struct servent *port; /* Port number for service */
667 int portnum; /* Port number */
668
669
670 /*
671 * Lookup the service...
672 */
673
674 if (!service)
675 portnum = 0;
676 else if (isdigit(*service & 255))
677 portnum = atoi(service);
678 else if ((port = getservbyname(service, NULL)) != NULL)
679 portnum = ntohs(port->s_port);
680 else if (!strcmp(service, "http"))
681 portnum = 80;
682 else if (!strcmp(service, "https"))
683 portnum = 443;
684 else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
685 portnum = 631;
686 else if (!strcmp(service, "lpd"))
687 portnum = 515;
688 else if (!strcmp(service, "socket"))
689 portnum = 9100;
690 else
691 return (NULL);
692
693 /*
694 * This code is needed because some operating systems have a
695 * buggy implementation of gethostbyname() that does not support
696 * IPv4 addresses. If the hostname string is an IPv4 address, then
697 * sscanf() is used to extract the IPv4 components. We then pack
698 * the components into an IPv4 address manually, since the
699 * inet_aton() function is deprecated. We use the htonl() macro
700 * to get the right byte order for the address.
701 */
702
703 for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++);
704
705 if (!*ptr)
706 {
707 /*
708 * We have an IPv4 address; break it up and create an IPv4 address...
709 */
710
711 if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 &&
712 ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255)
713 {
714 first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
715 if (!first)
716 return (NULL);
717
718 first->addr.ipv4.sin_family = AF_INET;
719 first->addr.ipv4.sin_addr.s_addr = htonl((((((((unsigned)ip[0] << 8) |
720 (unsigned)ip[1]) << 8) |
721 (unsigned)ip[2]) << 8) |
722 (unsigned)ip[3]));
723 first->addr.ipv4.sin_port = htons(portnum);
724 }
725 }
726 else if ((host = gethostbyname(hostname)) != NULL &&
727 # ifdef AF_INET6
728 (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6))
729 # else
730 host->h_addrtype == AF_INET)
731 # endif /* AF_INET6 */
732 {
733 for (i = 0; host->h_addr_list[i]; i ++)
734 {
735 /*
736 * Copy the address over...
737 */
738
739 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
740 if (!temp)
741 {
742 httpAddrFreeList(first);
743 return (NULL);
744 }
745
746 # ifdef AF_INET6
747 if (host->h_addrtype == AF_INET6)
748 {
749 temp->addr.ipv6.sin6_family = AF_INET6;
750 memcpy(&(temp->addr.ipv6.sin6_addr), host->h_addr_list[i],
751 sizeof(temp->addr.ipv6));
752 temp->addr.ipv6.sin6_port = htons(portnum);
753 }
754 else
755 # endif /* AF_INET6 */
756 {
757 temp->addr.ipv4.sin_family = AF_INET;
758 memcpy(&(temp->addr.ipv4.sin_addr), host->h_addr_list[i],
759 sizeof(temp->addr.ipv4));
760 temp->addr.ipv4.sin_port = htons(portnum);
761 }
762
763 /*
764 * Append the address to the list...
765 */
766
767 if (!first)
768 first = temp;
769
770 if (addr)
771 addr->next = temp;
772
773 addr = temp;
774 }
775 }
776 else
777 {
778 if (h_errno == NO_RECOVERY)
779 cg->need_res_init = 1;
780
781 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, hstrerror(h_errno), 0);
782 }
783 }
784 #endif /* HAVE_GETADDRINFO */
785 }
786
787 /*
788 * Detect some common errors and handle them sanely...
789 */
790
791 if (!addr && (!hostname || !_cups_strcasecmp(hostname, "localhost")))
792 {
793 struct servent *port; /* Port number for service */
794 int portnum; /* Port number */
795
796
797 /*
798 * Lookup the service...
799 */
800
801 if (!service)
802 portnum = 0;
803 else if (isdigit(*service & 255))
804 portnum = atoi(service);
805 else if ((port = getservbyname(service, NULL)) != NULL)
806 portnum = ntohs(port->s_port);
807 else if (!strcmp(service, "http"))
808 portnum = 80;
809 else if (!strcmp(service, "https"))
810 portnum = 443;
811 else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
812 portnum = 631;
813 else if (!strcmp(service, "lpd"))
814 portnum = 515;
815 else if (!strcmp(service, "socket"))
816 portnum = 9100;
817 else
818 {
819 httpAddrFreeList(first);
820
821 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unknown service name."), 1);
822 return (NULL);
823 }
824
825 if (hostname && !_cups_strcasecmp(hostname, "localhost"))
826 {
827 /*
828 * Unfortunately, some users ignore all of the warnings in the
829 * /etc/hosts file and delete "localhost" from it. If we get here
830 * then we were unable to resolve the name, so use the IPv6 and/or
831 * IPv4 loopback interface addresses...
832 */
833
834 #ifdef AF_INET6
835 if (family != AF_INET)
836 {
837 /*
838 * Add [::1] to the address list...
839 */
840
841 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
842 if (!temp)
843 {
844 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
845 httpAddrFreeList(first);
846 return (NULL);
847 }
848
849 temp->addr.ipv6.sin6_family = AF_INET6;
850 temp->addr.ipv6.sin6_port = htons(portnum);
851 # ifdef WIN32
852 temp->addr.ipv6.sin6_addr.u.Byte[15] = 1;
853 # else
854 temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1);
855 # endif /* WIN32 */
856
857 if (!first)
858 first = temp;
859
860 addr = temp;
861 }
862
863 if (family != AF_INET6)
864 #endif /* AF_INET6 */
865 {
866 /*
867 * Add 127.0.0.1 to the address list...
868 */
869
870 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
871 if (!temp)
872 {
873 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
874 httpAddrFreeList(first);
875 return (NULL);
876 }
877
878 temp->addr.ipv4.sin_family = AF_INET;
879 temp->addr.ipv4.sin_port = htons(portnum);
880 temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001);
881
882 if (!first)
883 first = temp;
884
885 if (addr)
886 addr->next = temp;
887 }
888 }
889 else if (!hostname)
890 {
891 /*
892 * Provide one or more passive listening addresses...
893 */
894
895 #ifdef AF_INET6
896 if (family != AF_INET)
897 {
898 /*
899 * Add [::] to the address list...
900 */
901
902 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
903 if (!temp)
904 {
905 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
906 httpAddrFreeList(first);
907 return (NULL);
908 }
909
910 temp->addr.ipv6.sin6_family = AF_INET6;
911 temp->addr.ipv6.sin6_port = htons(portnum);
912
913 if (!first)
914 first = temp;
915
916 addr = temp;
917 }
918
919 if (family != AF_INET6)
920 #endif /* AF_INET6 */
921 {
922 /*
923 * Add 0.0.0.0 to the address list...
924 */
925
926 temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
927 if (!temp)
928 {
929 _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
930 httpAddrFreeList(first);
931 return (NULL);
932 }
933
934 temp->addr.ipv4.sin_family = AF_INET;
935 temp->addr.ipv4.sin_port = htons(portnum);
936
937 if (!first)
938 first = temp;
939
940 if (addr)
941 addr->next = temp;
942 }
943 }
944 }
945
946 /*
947 * Return the address list...
948 */
949
950 return (first);
951 }
952