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ef416fc2 | 1 | /* |
bc44d920 | 2 | * "$Id: http-addrlist.c 6649 2007-07-11 21:46:42Z mike $" |
ef416fc2 | 3 | * |
4 | * HTTP address list routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
91c84a35 | 6 | * Copyright 2007-2008 by Apple Inc. |
b86bc4cf | 7 | * Copyright 1997-2007 by Easy Software Products, all rights reserved. |
ef416fc2 | 8 | * |
9 | * These coded instructions, statements, and computer programs are the | |
bc44d920 | 10 | * property of Apple Inc. and are protected by Federal copyright |
11 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
12 | * which should have been included with this file. If this file is | |
13 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
ef416fc2 | 14 | * |
15 | * Contents: | |
16 | * | |
17 | * httpAddrConnect() - Connect to any of the addresses in the list. | |
18 | * httpAddrFreeList() - Free an address list. | |
19 | * httpAddrGetList() - Get a list of addresses for a hostname. | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Include necessary headers... | |
24 | */ | |
25 | ||
26 | #include "http-private.h" | |
27 | #include "globals.h" | |
28 | #include "debug.h" | |
29 | #include <stdlib.h> | |
30 | ||
31 | ||
32 | /* | |
33 | * 'httpAddrConnect()' - Connect to any of the addresses in the list. | |
34 | * | |
35 | * @since CUPS 1.2@ | |
36 | */ | |
37 | ||
38 | http_addrlist_t * /* O - Connected address or NULL on failure */ | |
39 | httpAddrConnect( | |
40 | http_addrlist_t *addrlist, /* I - List of potential addresses */ | |
41 | int *sock) /* O - Socket */ | |
42 | { | |
43 | int val; /* Socket option value */ | |
44 | ||
45 | ||
46 | /* | |
47 | * Loop through each address until we connect or run out of addresses... | |
48 | */ | |
49 | ||
50 | while (addrlist) | |
51 | { | |
52 | /* | |
53 | * Create the socket... | |
54 | */ | |
55 | ||
b86bc4cf | 56 | if ((*sock = (int)socket(addrlist->addr.addr.sa_family, SOCK_STREAM, 0)) < 0) |
ef416fc2 | 57 | { |
58 | /* | |
59 | * Don't abort yet, as this could just be an issue with the local | |
60 | * system not being configured with IPv4/IPv6/domain socket enabled... | |
61 | */ | |
62 | ||
63 | addrlist = addrlist->next; | |
64 | continue; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Set options... | |
69 | */ | |
70 | ||
71 | val = 1; | |
72 | #ifdef WIN32 | |
73 | setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, | |
74 | sizeof(val)); | |
75 | #else | |
76 | setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); | |
77 | #endif /* WIN32 */ | |
78 | ||
79 | #ifdef SO_REUSEPORT | |
80 | val = 1; | |
81 | setsockopt(*sock, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)); | |
82 | #endif /* SO_REUSEPORT */ | |
83 | ||
fa73b229 | 84 | #ifdef SO_NOSIGPIPE |
85 | val = 1; | |
86 | setsockopt(*sock, SOL_SOCKET, SO_NOSIGPIPE, &val, sizeof(val)); | |
87 | #endif /* SO_NOSIGPIPE */ | |
88 | ||
ef416fc2 | 89 | /* |
90 | * Using TCP_NODELAY improves responsiveness, especially on systems | |
91 | * with a slow loopback interface... | |
92 | */ | |
93 | ||
94 | val = 1; | |
95 | #ifdef WIN32 | |
96 | setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&val, | |
97 | sizeof(val)); | |
98 | #else | |
99 | setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)); | |
100 | #endif /* WIN32 */ | |
101 | ||
102 | #ifdef FD_CLOEXEC | |
103 | /* | |
104 | * Close this socket when starting another process... | |
105 | */ | |
106 | ||
107 | fcntl(*sock, F_SETFD, FD_CLOEXEC); | |
108 | #endif /* FD_CLOEXEC */ | |
109 | ||
110 | /* | |
111 | * Then connect... | |
112 | */ | |
113 | ||
114 | if (!connect(*sock, &(addrlist->addr.addr), | |
115 | httpAddrLength(&(addrlist->addr)))) | |
116 | break; | |
117 | ||
118 | /* | |
119 | * Close this socket and move to the next address... | |
120 | */ | |
121 | ||
bd7854cb | 122 | #ifdef WIN32 |
ef416fc2 | 123 | closesocket(*sock); |
bd7854cb | 124 | #else |
125 | close(*sock); | |
126 | #endif /* WIN32 */ | |
ef416fc2 | 127 | |
128 | addrlist = addrlist->next; | |
129 | } | |
130 | ||
131 | return (addrlist); | |
132 | } | |
133 | ||
134 | ||
135 | /* | |
136 | * 'httpAddrFreeList()' - Free an address list. | |
137 | * | |
138 | * @since CUPS 1.2@ | |
139 | */ | |
140 | ||
141 | void | |
142 | httpAddrFreeList( | |
143 | http_addrlist_t *addrlist) /* I - Address list to free */ | |
144 | { | |
145 | http_addrlist_t *next; /* Next address in list */ | |
146 | ||
147 | ||
148 | /* | |
149 | * Free each address in the list... | |
150 | */ | |
151 | ||
152 | while (addrlist) | |
153 | { | |
154 | next = addrlist->next; | |
155 | ||
156 | free(addrlist); | |
157 | ||
158 | addrlist = next; | |
159 | } | |
160 | } | |
161 | ||
162 | ||
163 | /* | |
164 | * 'httpAddrGetList()' - Get a list of addresses for a hostname. | |
165 | * | |
166 | * @since CUPS 1.2@ | |
167 | */ | |
168 | ||
169 | http_addrlist_t * /* O - List of addresses or NULL */ | |
170 | httpAddrGetList(const char *hostname, /* I - Hostname, IP address, or NULL for passive listen address */ | |
171 | int family, /* I - Address family or AF_UNSPEC */ | |
172 | const char *service) /* I - Service name or port number */ | |
173 | { | |
174 | http_addrlist_t *first, /* First address in list */ | |
175 | *addr, /* Current address in list */ | |
176 | *temp; /* New address */ | |
177 | ||
178 | ||
179 | #ifdef DEBUG | |
180 | printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, service=\"%s\")\n", | |
181 | hostname ? hostname : "(nil)", | |
182 | family == AF_UNSPEC ? "UNSPEC" : | |
183 | # ifdef AF_LOCAL | |
184 | family == AF_LOCAL ? "LOCAL" : | |
185 | # endif /* AF_LOCAL */ | |
186 | # ifdef AF_INET6 | |
187 | family == AF_INET6 ? "INET6" : | |
188 | # endif /* AF_INET6 */ | |
189 | family == AF_INET ? "INET" : "???", service); | |
190 | #endif /* DEBUG */ | |
191 | ||
192 | /* | |
193 | * Lookup the address the best way we can... | |
194 | */ | |
195 | ||
196 | first = addr = NULL; | |
197 | ||
198 | #ifdef AF_LOCAL | |
199 | if (hostname && hostname[0] == '/') | |
200 | { | |
201 | /* | |
202 | * Domain socket address... | |
203 | */ | |
204 | ||
91c84a35 MS |
205 | if ((first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t))) != NULL) |
206 | { | |
207 | first->addr.un.sun_family = AF_LOCAL; | |
208 | strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path)); | |
209 | } | |
ef416fc2 | 210 | } |
211 | else | |
212 | #endif /* AF_LOCAL */ | |
213 | { | |
214 | #ifdef HAVE_GETADDRINFO | |
215 | struct addrinfo hints, /* Address lookup hints */ | |
216 | *results, /* Address lookup results */ | |
217 | *current; /* Current result */ | |
218 | char ipv6[1024], /* IPv6 address */ | |
219 | *ipv6zone; /* Pointer to zone separator */ | |
220 | int ipv6len; /* Length of IPv6 address */ | |
221 | ||
222 | /* | |
223 | * Lookup the address as needed... | |
224 | */ | |
225 | ||
226 | memset(&hints, 0, sizeof(hints)); | |
227 | hints.ai_family = family; | |
228 | hints.ai_flags = hostname ? 0 : AI_PASSIVE; | |
229 | hints.ai_socktype = SOCK_STREAM; | |
230 | ||
231 | if (hostname && *hostname == '[') | |
232 | { | |
233 | /* | |
234 | * Remove brackets from numeric IPv6 address... | |
235 | */ | |
236 | ||
237 | if (!strncmp(hostname, "[v1.", 4)) | |
238 | { | |
239 | /* | |
240 | * Copy the newer address format which supports link-local addresses... | |
241 | */ | |
242 | ||
243 | strlcpy(ipv6, hostname + 4, sizeof(ipv6)); | |
b86bc4cf | 244 | if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']') |
ef416fc2 | 245 | { |
246 | ipv6[ipv6len] = '\0'; | |
247 | hostname = ipv6; | |
248 | ||
249 | /* | |
250 | * Convert "+zone" in address to "%zone"... | |
251 | */ | |
252 | ||
253 | if ((ipv6zone = strrchr(ipv6, '+')) != NULL) | |
254 | *ipv6zone = '%'; | |
255 | } | |
256 | } | |
257 | else | |
258 | { | |
259 | /* | |
260 | * Copy the regular non-link-local IPv6 address... | |
261 | */ | |
262 | ||
263 | strlcpy(ipv6, hostname + 1, sizeof(ipv6)); | |
b86bc4cf | 264 | if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']') |
ef416fc2 | 265 | { |
266 | ipv6[ipv6len] = '\0'; | |
267 | hostname = ipv6; | |
268 | } | |
269 | } | |
270 | } | |
271 | ||
272 | if (!getaddrinfo(hostname, service, &hints, &results)) | |
273 | { | |
274 | /* | |
275 | * Copy the results to our own address list structure... | |
276 | */ | |
277 | ||
278 | for (current = results; current; current = current->ai_next) | |
279 | if (current->ai_family == AF_INET || current->ai_family == AF_INET6) | |
280 | { | |
281 | /* | |
282 | * Copy the address over... | |
283 | */ | |
284 | ||
285 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
286 | if (!temp) | |
287 | { | |
288 | httpAddrFreeList(first); | |
289 | return (NULL); | |
290 | } | |
291 | ||
292 | if (current->ai_family == AF_INET6) | |
293 | memcpy(&(temp->addr.ipv6), current->ai_addr, | |
294 | sizeof(temp->addr.ipv6)); | |
295 | else | |
296 | memcpy(&(temp->addr.ipv4), current->ai_addr, | |
297 | sizeof(temp->addr.ipv4)); | |
298 | ||
299 | /* | |
300 | * Append the address to the list... | |
301 | */ | |
302 | ||
303 | if (!first) | |
304 | first = temp; | |
305 | ||
306 | if (addr) | |
307 | addr->next = temp; | |
308 | ||
309 | addr = temp; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Free the results from getaddrinfo()... | |
314 | */ | |
315 | ||
316 | freeaddrinfo(results); | |
317 | } | |
318 | #else | |
319 | if (hostname) | |
320 | { | |
321 | int i; /* Looping vars */ | |
322 | unsigned ip[4]; /* IPv4 address components */ | |
323 | const char *ptr; /* Pointer into hostname */ | |
324 | struct hostent *host; /* Result of lookup */ | |
325 | struct servent *port; /* Port number for service */ | |
326 | int portnum; /* Port number */ | |
327 | ||
328 | ||
329 | /* | |
330 | * Lookup the service... | |
331 | */ | |
332 | ||
333 | if (!service) | |
334 | portnum = 0; | |
335 | else if (isdigit(*service & 255)) | |
336 | portnum = atoi(service); | |
337 | else if ((port = getservbyname(service, NULL)) != NULL) | |
338 | portnum = ntohs(port->s_port); | |
339 | else if (!strcmp(service, "http")) | |
340 | portnum = 80; | |
341 | else if (!strcmp(service, "https")) | |
342 | portnum = 443; | |
343 | else if (!strcmp(service, "ipp")) | |
344 | portnum = 631; | |
345 | else if (!strcmp(service, "lpd")) | |
346 | portnum = 515; | |
347 | else if (!strcmp(service, "socket")) | |
348 | portnum = 9100; | |
349 | else | |
350 | return (NULL); | |
351 | ||
352 | /* | |
353 | * This code is needed because some operating systems have a | |
354 | * buggy implementation of gethostbyname() that does not support | |
355 | * IPv4 addresses. If the hostname string is an IPv4 address, then | |
356 | * sscanf() is used to extract the IPv4 components. We then pack | |
357 | * the components into an IPv4 address manually, since the | |
358 | * inet_aton() function is deprecated. We use the htonl() macro | |
359 | * to get the right byte order for the address. | |
360 | */ | |
361 | ||
362 | for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++); | |
363 | ||
364 | if (!*ptr) | |
365 | { | |
366 | /* | |
367 | * We have an IPv4 address; break it up and create an IPv4 address... | |
368 | */ | |
369 | ||
370 | if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 && | |
371 | ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255) | |
372 | { | |
373 | first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
374 | if (!first) | |
375 | return (NULL); | |
376 | ||
377 | first->addr.ipv4.sin_family = AF_INET; | |
378 | first->addr.ipv4.sin_addr.s_addr = htonl(((((((ip[0] << 8) | | |
379 | ip[1]) << 8) | | |
380 | ip[2]) << 8) | ip[3])); | |
381 | first->addr.ipv4.sin_port = htons(portnum); | |
382 | } | |
383 | } | |
384 | else if ((host = gethostbyname(hostname)) != NULL && | |
385 | # ifdef AF_INET6 | |
386 | (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6)) | |
387 | # else | |
388 | host->h_addrtype == AF_INET) | |
389 | # endif /* AF_INET6 */ | |
390 | { | |
391 | for (i = 0; host->h_addr_list[i]; i ++) | |
392 | { | |
393 | /* | |
394 | * Copy the address over... | |
395 | */ | |
396 | ||
397 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
398 | if (!temp) | |
399 | { | |
400 | httpAddrFreeList(first); | |
401 | return (NULL); | |
402 | } | |
403 | ||
404 | # ifdef AF_INET6 | |
405 | if (host->h_addrtype == AF_INET6) | |
406 | { | |
d6ae789d | 407 | temp->addr.ipv6.sin6_family = AF_INET6; |
ed486911 | 408 | memcpy(&(temp->addr.ipv6.sin6_addr), host->h_addr_list[i], |
ef416fc2 | 409 | sizeof(temp->addr.ipv6)); |
410 | temp->addr.ipv6.sin6_port = htons(portnum); | |
411 | } | |
412 | else | |
413 | # endif /* AF_INET6 */ | |
414 | { | |
d6ae789d | 415 | temp->addr.ipv4.sin_family = AF_INET; |
ed486911 | 416 | memcpy(&(temp->addr.ipv4.sin_addr), host->h_addr_list[i], |
ef416fc2 | 417 | sizeof(temp->addr.ipv4)); |
418 | temp->addr.ipv4.sin_port = htons(portnum); | |
419 | } | |
420 | ||
421 | /* | |
422 | * Append the address to the list... | |
423 | */ | |
424 | ||
425 | if (!first) | |
426 | first = temp; | |
427 | ||
428 | if (addr) | |
429 | addr->next = temp; | |
430 | ||
431 | addr = temp; | |
432 | } | |
433 | } | |
434 | } | |
435 | #endif /* HAVE_GETADDRINFO */ | |
436 | } | |
437 | ||
438 | /* | |
439 | * Detect some common errors and handle them sanely... | |
440 | */ | |
441 | ||
442 | if (!addr && (!hostname || !strcmp(hostname, "localhost"))) | |
443 | { | |
444 | struct servent *port; /* Port number for service */ | |
445 | int portnum; /* Port number */ | |
446 | ||
447 | ||
448 | /* | |
449 | * Lookup the service... | |
450 | */ | |
451 | ||
452 | if (!service) | |
453 | portnum = 0; | |
454 | else if (isdigit(*service & 255)) | |
455 | portnum = atoi(service); | |
456 | else if ((port = getservbyname(service, NULL)) != NULL) | |
457 | portnum = ntohs(port->s_port); | |
458 | else if (!strcmp(service, "http")) | |
459 | portnum = 80; | |
460 | else if (!strcmp(service, "https")) | |
461 | portnum = 443; | |
462 | else if (!strcmp(service, "ipp")) | |
463 | portnum = 631; | |
464 | else if (!strcmp(service, "lpd")) | |
465 | portnum = 515; | |
466 | else if (!strcmp(service, "socket")) | |
467 | portnum = 9100; | |
468 | else | |
469 | return (NULL); | |
470 | ||
471 | if (hostname && !strcmp(hostname, "localhost")) | |
472 | { | |
473 | /* | |
474 | * Unfortunately, some users ignore all of the warnings in the | |
475 | * /etc/hosts file and delete "localhost" from it. If we get here | |
476 | * then we were unable to resolve the name, so use the IPv6 and/or | |
477 | * IPv4 loopback interface addresses... | |
478 | */ | |
479 | ||
480 | #ifdef AF_INET6 | |
481 | if (family != AF_INET) | |
482 | { | |
483 | /* | |
484 | * Add [::1] to the address list... | |
485 | */ | |
486 | ||
487 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
488 | if (!temp) | |
489 | { | |
490 | httpAddrFreeList(first); | |
491 | return (NULL); | |
492 | } | |
493 | ||
494 | temp->addr.ipv6.sin6_family = AF_INET6; | |
495 | temp->addr.ipv6.sin6_port = htons(portnum); | |
496 | # ifdef WIN32 | |
497 | temp->addr.ipv6.sin6_addr.u.Byte[15] = 1; | |
498 | # else | |
499 | temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1); | |
500 | # endif /* WIN32 */ | |
501 | ||
ed486911 | 502 | if (!first) |
503 | first = temp; | |
504 | ||
ef416fc2 | 505 | addr = temp; |
506 | } | |
507 | ||
508 | if (family != AF_INET6) | |
509 | #endif /* AF_INET6 */ | |
510 | { | |
511 | /* | |
512 | * Add 127.0.0.1 to the address list... | |
513 | */ | |
514 | ||
515 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
516 | if (!temp) | |
517 | { | |
518 | httpAddrFreeList(first); | |
519 | return (NULL); | |
520 | } | |
521 | ||
522 | temp->addr.ipv4.sin_family = AF_INET; | |
523 | temp->addr.ipv4.sin_port = htons(portnum); | |
524 | temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001); | |
525 | ||
ed486911 | 526 | if (!first) |
527 | first = temp; | |
528 | ||
ef416fc2 | 529 | if (addr) |
530 | addr->next = temp; | |
531 | else | |
532 | addr = temp; | |
533 | } | |
534 | } | |
535 | else if (!hostname) | |
536 | { | |
537 | /* | |
538 | * Provide one or more passive listening addresses... | |
539 | */ | |
540 | ||
541 | #ifdef AF_INET6 | |
542 | if (family != AF_INET) | |
543 | { | |
544 | /* | |
545 | * Add [::] to the address list... | |
546 | */ | |
547 | ||
548 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
549 | if (!temp) | |
550 | { | |
551 | httpAddrFreeList(first); | |
552 | return (NULL); | |
553 | } | |
554 | ||
555 | temp->addr.ipv6.sin6_family = AF_INET6; | |
556 | temp->addr.ipv6.sin6_port = htons(portnum); | |
557 | ||
ed486911 | 558 | if (!first) |
559 | first = temp; | |
560 | ||
ef416fc2 | 561 | addr = temp; |
562 | } | |
563 | ||
564 | if (family != AF_INET6) | |
565 | #endif /* AF_INET6 */ | |
566 | { | |
567 | /* | |
568 | * Add 0.0.0.0 to the address list... | |
569 | */ | |
570 | ||
571 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
572 | if (!temp) | |
573 | { | |
574 | httpAddrFreeList(first); | |
575 | return (NULL); | |
576 | } | |
577 | ||
578 | temp->addr.ipv4.sin_family = AF_INET; | |
579 | temp->addr.ipv4.sin_port = htons(portnum); | |
580 | ||
ed486911 | 581 | if (!first) |
582 | first = temp; | |
583 | ||
ef416fc2 | 584 | if (addr) |
585 | addr->next = temp; | |
586 | else | |
587 | addr = temp; | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | /* | |
593 | * Return the address list... | |
594 | */ | |
595 | ||
596 | return (first); | |
597 | } | |
598 | ||
599 | ||
600 | /* | |
bc44d920 | 601 | * End of "$Id: http-addrlist.c 6649 2007-07-11 21:46:42Z mike $". |
ef416fc2 | 602 | */ |