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ef416fc2 | 1 | /* |
bd7854cb | 2 | * "$Id: http-addrlist.c 5103 2006-02-14 19:27:42Z mike $" |
ef416fc2 | 3 | * |
4 | * HTTP address list routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
fa73b229 | 6 | * Copyright 1997-2006 by Easy Software Products, all rights reserved. |
ef416fc2 | 7 | * |
8 | * These coded instructions, statements, and computer programs are the | |
9 | * property of Easy Software Products and are protected by Federal | |
10 | * copyright law. Distribution and use rights are outlined in the file | |
11 | * "LICENSE.txt" which should have been included with this file. If this | |
12 | * file is missing or damaged please contact Easy Software Products | |
13 | * at: | |
14 | * | |
15 | * Attn: CUPS Licensing Information | |
16 | * Easy Software Products | |
17 | * 44141 Airport View Drive, Suite 204 | |
18 | * Hollywood, Maryland 20636 USA | |
19 | * | |
20 | * Voice: (301) 373-9600 | |
21 | * EMail: cups-info@cups.org | |
22 | * WWW: http://www.cups.org | |
23 | * | |
24 | * Contents: | |
25 | * | |
26 | * httpAddrConnect() - Connect to any of the addresses in the list. | |
27 | * httpAddrFreeList() - Free an address list. | |
28 | * httpAddrGetList() - Get a list of addresses for a hostname. | |
29 | */ | |
30 | ||
31 | /* | |
32 | * Include necessary headers... | |
33 | */ | |
34 | ||
35 | #include "http-private.h" | |
36 | #include "globals.h" | |
37 | #include "debug.h" | |
38 | #include <stdlib.h> | |
39 | ||
40 | ||
41 | /* | |
42 | * 'httpAddrConnect()' - Connect to any of the addresses in the list. | |
43 | * | |
44 | * @since CUPS 1.2@ | |
45 | */ | |
46 | ||
47 | http_addrlist_t * /* O - Connected address or NULL on failure */ | |
48 | httpAddrConnect( | |
49 | http_addrlist_t *addrlist, /* I - List of potential addresses */ | |
50 | int *sock) /* O - Socket */ | |
51 | { | |
52 | int val; /* Socket option value */ | |
53 | ||
54 | ||
55 | /* | |
56 | * Loop through each address until we connect or run out of addresses... | |
57 | */ | |
58 | ||
59 | while (addrlist) | |
60 | { | |
61 | /* | |
62 | * Create the socket... | |
63 | */ | |
64 | ||
65 | if ((*sock = socket(addrlist->addr.addr.sa_family, SOCK_STREAM, 0)) < 0) | |
66 | { | |
67 | /* | |
68 | * Don't abort yet, as this could just be an issue with the local | |
69 | * system not being configured with IPv4/IPv6/domain socket enabled... | |
70 | */ | |
71 | ||
72 | addrlist = addrlist->next; | |
73 | continue; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Set options... | |
78 | */ | |
79 | ||
80 | val = 1; | |
81 | #ifdef WIN32 | |
82 | setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, | |
83 | sizeof(val)); | |
84 | #else | |
85 | setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); | |
86 | #endif /* WIN32 */ | |
87 | ||
88 | #ifdef SO_REUSEPORT | |
89 | val = 1; | |
90 | setsockopt(*sock, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)); | |
91 | #endif /* SO_REUSEPORT */ | |
92 | ||
fa73b229 | 93 | #ifdef SO_NOSIGPIPE |
94 | val = 1; | |
95 | setsockopt(*sock, SOL_SOCKET, SO_NOSIGPIPE, &val, sizeof(val)); | |
96 | #endif /* SO_NOSIGPIPE */ | |
97 | ||
ef416fc2 | 98 | /* |
99 | * Using TCP_NODELAY improves responsiveness, especially on systems | |
100 | * with a slow loopback interface... | |
101 | */ | |
102 | ||
103 | val = 1; | |
104 | #ifdef WIN32 | |
105 | setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&val, | |
106 | sizeof(val)); | |
107 | #else | |
108 | setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)); | |
109 | #endif /* WIN32 */ | |
110 | ||
111 | #ifdef FD_CLOEXEC | |
112 | /* | |
113 | * Close this socket when starting another process... | |
114 | */ | |
115 | ||
116 | fcntl(*sock, F_SETFD, FD_CLOEXEC); | |
117 | #endif /* FD_CLOEXEC */ | |
118 | ||
119 | /* | |
120 | * Then connect... | |
121 | */ | |
122 | ||
123 | if (!connect(*sock, &(addrlist->addr.addr), | |
124 | httpAddrLength(&(addrlist->addr)))) | |
125 | break; | |
126 | ||
127 | /* | |
128 | * Close this socket and move to the next address... | |
129 | */ | |
130 | ||
bd7854cb | 131 | #ifdef WIN32 |
ef416fc2 | 132 | closesocket(*sock); |
bd7854cb | 133 | #else |
134 | close(*sock); | |
135 | #endif /* WIN32 */ | |
ef416fc2 | 136 | |
137 | addrlist = addrlist->next; | |
138 | } | |
139 | ||
140 | return (addrlist); | |
141 | } | |
142 | ||
143 | ||
144 | /* | |
145 | * 'httpAddrFreeList()' - Free an address list. | |
146 | * | |
147 | * @since CUPS 1.2@ | |
148 | */ | |
149 | ||
150 | void | |
151 | httpAddrFreeList( | |
152 | http_addrlist_t *addrlist) /* I - Address list to free */ | |
153 | { | |
154 | http_addrlist_t *next; /* Next address in list */ | |
155 | ||
156 | ||
157 | /* | |
158 | * Free each address in the list... | |
159 | */ | |
160 | ||
161 | while (addrlist) | |
162 | { | |
163 | next = addrlist->next; | |
164 | ||
165 | free(addrlist); | |
166 | ||
167 | addrlist = next; | |
168 | } | |
169 | } | |
170 | ||
171 | ||
172 | /* | |
173 | * 'httpAddrGetList()' - Get a list of addresses for a hostname. | |
174 | * | |
175 | * @since CUPS 1.2@ | |
176 | */ | |
177 | ||
178 | http_addrlist_t * /* O - List of addresses or NULL */ | |
179 | httpAddrGetList(const char *hostname, /* I - Hostname, IP address, or NULL for passive listen address */ | |
180 | int family, /* I - Address family or AF_UNSPEC */ | |
181 | const char *service) /* I - Service name or port number */ | |
182 | { | |
183 | http_addrlist_t *first, /* First address in list */ | |
184 | *addr, /* Current address in list */ | |
185 | *temp; /* New address */ | |
186 | ||
187 | ||
188 | #ifdef DEBUG | |
189 | printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, service=\"%s\")\n", | |
190 | hostname ? hostname : "(nil)", | |
191 | family == AF_UNSPEC ? "UNSPEC" : | |
192 | # ifdef AF_LOCAL | |
193 | family == AF_LOCAL ? "LOCAL" : | |
194 | # endif /* AF_LOCAL */ | |
195 | # ifdef AF_INET6 | |
196 | family == AF_INET6 ? "INET6" : | |
197 | # endif /* AF_INET6 */ | |
198 | family == AF_INET ? "INET" : "???", service); | |
199 | #endif /* DEBUG */ | |
200 | ||
201 | /* | |
202 | * Lookup the address the best way we can... | |
203 | */ | |
204 | ||
205 | first = addr = NULL; | |
206 | ||
207 | #ifdef AF_LOCAL | |
208 | if (hostname && hostname[0] == '/') | |
209 | { | |
210 | /* | |
211 | * Domain socket address... | |
212 | */ | |
213 | ||
214 | first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
215 | first->addr.un.sun_family = AF_LOCAL; | |
216 | strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path)); | |
217 | } | |
218 | else | |
219 | #endif /* AF_LOCAL */ | |
220 | { | |
221 | #ifdef HAVE_GETADDRINFO | |
222 | struct addrinfo hints, /* Address lookup hints */ | |
223 | *results, /* Address lookup results */ | |
224 | *current; /* Current result */ | |
225 | char ipv6[1024], /* IPv6 address */ | |
226 | *ipv6zone; /* Pointer to zone separator */ | |
227 | int ipv6len; /* Length of IPv6 address */ | |
228 | ||
229 | /* | |
230 | * Lookup the address as needed... | |
231 | */ | |
232 | ||
233 | memset(&hints, 0, sizeof(hints)); | |
234 | hints.ai_family = family; | |
235 | hints.ai_flags = hostname ? 0 : AI_PASSIVE; | |
236 | hints.ai_socktype = SOCK_STREAM; | |
237 | ||
238 | if (hostname && *hostname == '[') | |
239 | { | |
240 | /* | |
241 | * Remove brackets from numeric IPv6 address... | |
242 | */ | |
243 | ||
244 | if (!strncmp(hostname, "[v1.", 4)) | |
245 | { | |
246 | /* | |
247 | * Copy the newer address format which supports link-local addresses... | |
248 | */ | |
249 | ||
250 | strlcpy(ipv6, hostname + 4, sizeof(ipv6)); | |
251 | if ((ipv6len = strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']') | |
252 | { | |
253 | ipv6[ipv6len] = '\0'; | |
254 | hostname = ipv6; | |
255 | ||
256 | /* | |
257 | * Convert "+zone" in address to "%zone"... | |
258 | */ | |
259 | ||
260 | if ((ipv6zone = strrchr(ipv6, '+')) != NULL) | |
261 | *ipv6zone = '%'; | |
262 | } | |
263 | } | |
264 | else | |
265 | { | |
266 | /* | |
267 | * Copy the regular non-link-local IPv6 address... | |
268 | */ | |
269 | ||
270 | strlcpy(ipv6, hostname + 1, sizeof(ipv6)); | |
271 | if ((ipv6len = strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']') | |
272 | { | |
273 | ipv6[ipv6len] = '\0'; | |
274 | hostname = ipv6; | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
279 | if (!getaddrinfo(hostname, service, &hints, &results)) | |
280 | { | |
281 | /* | |
282 | * Copy the results to our own address list structure... | |
283 | */ | |
284 | ||
285 | for (current = results; current; current = current->ai_next) | |
286 | if (current->ai_family == AF_INET || current->ai_family == AF_INET6) | |
287 | { | |
288 | /* | |
289 | * Copy the address over... | |
290 | */ | |
291 | ||
292 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
293 | if (!temp) | |
294 | { | |
295 | httpAddrFreeList(first); | |
296 | return (NULL); | |
297 | } | |
298 | ||
299 | if (current->ai_family == AF_INET6) | |
300 | memcpy(&(temp->addr.ipv6), current->ai_addr, | |
301 | sizeof(temp->addr.ipv6)); | |
302 | else | |
303 | memcpy(&(temp->addr.ipv4), current->ai_addr, | |
304 | sizeof(temp->addr.ipv4)); | |
305 | ||
306 | /* | |
307 | * Append the address to the list... | |
308 | */ | |
309 | ||
310 | if (!first) | |
311 | first = temp; | |
312 | ||
313 | if (addr) | |
314 | addr->next = temp; | |
315 | ||
316 | addr = temp; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Free the results from getaddrinfo()... | |
321 | */ | |
322 | ||
323 | freeaddrinfo(results); | |
324 | } | |
325 | #else | |
326 | if (hostname) | |
327 | { | |
328 | int i; /* Looping vars */ | |
329 | unsigned ip[4]; /* IPv4 address components */ | |
330 | const char *ptr; /* Pointer into hostname */ | |
331 | struct hostent *host; /* Result of lookup */ | |
332 | struct servent *port; /* Port number for service */ | |
333 | int portnum; /* Port number */ | |
334 | ||
335 | ||
336 | /* | |
337 | * Lookup the service... | |
338 | */ | |
339 | ||
340 | if (!service) | |
341 | portnum = 0; | |
342 | else if (isdigit(*service & 255)) | |
343 | portnum = atoi(service); | |
344 | else if ((port = getservbyname(service, NULL)) != NULL) | |
345 | portnum = ntohs(port->s_port); | |
346 | else if (!strcmp(service, "http")) | |
347 | portnum = 80; | |
348 | else if (!strcmp(service, "https")) | |
349 | portnum = 443; | |
350 | else if (!strcmp(service, "ipp")) | |
351 | portnum = 631; | |
352 | else if (!strcmp(service, "lpd")) | |
353 | portnum = 515; | |
354 | else if (!strcmp(service, "socket")) | |
355 | portnum = 9100; | |
356 | else | |
357 | return (NULL); | |
358 | ||
359 | /* | |
360 | * This code is needed because some operating systems have a | |
361 | * buggy implementation of gethostbyname() that does not support | |
362 | * IPv4 addresses. If the hostname string is an IPv4 address, then | |
363 | * sscanf() is used to extract the IPv4 components. We then pack | |
364 | * the components into an IPv4 address manually, since the | |
365 | * inet_aton() function is deprecated. We use the htonl() macro | |
366 | * to get the right byte order for the address. | |
367 | */ | |
368 | ||
369 | for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++); | |
370 | ||
371 | if (!*ptr) | |
372 | { | |
373 | /* | |
374 | * We have an IPv4 address; break it up and create an IPv4 address... | |
375 | */ | |
376 | ||
377 | if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 && | |
378 | ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255) | |
379 | { | |
380 | first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
381 | if (!first) | |
382 | return (NULL); | |
383 | ||
384 | first->addr.ipv4.sin_family = AF_INET; | |
385 | first->addr.ipv4.sin_addr.s_addr = htonl(((((((ip[0] << 8) | | |
386 | ip[1]) << 8) | | |
387 | ip[2]) << 8) | ip[3])); | |
388 | first->addr.ipv4.sin_port = htons(portnum); | |
389 | } | |
390 | } | |
391 | else if ((host = gethostbyname(hostname)) != NULL && | |
392 | # ifdef AF_INET6 | |
393 | (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6)) | |
394 | # else | |
395 | host->h_addrtype == AF_INET) | |
396 | # endif /* AF_INET6 */ | |
397 | { | |
398 | for (i = 0; host->h_addr_list[i]; i ++) | |
399 | { | |
400 | /* | |
401 | * Copy the address over... | |
402 | */ | |
403 | ||
404 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
405 | if (!temp) | |
406 | { | |
407 | httpAddrFreeList(first); | |
408 | return (NULL); | |
409 | } | |
410 | ||
411 | # ifdef AF_INET6 | |
412 | if (host->h_addrtype == AF_INET6) | |
413 | { | |
414 | first->addr.ipv6.sin6_family = AF_INET6; | |
415 | memcpy(&(temp->addr.ipv6), host->h_addr_list[i], | |
416 | sizeof(temp->addr.ipv6)); | |
417 | temp->addr.ipv6.sin6_port = htons(portnum); | |
418 | } | |
419 | else | |
420 | # endif /* AF_INET6 */ | |
421 | { | |
422 | first->addr.ipv4.sin_family = AF_INET; | |
423 | memcpy(&(temp->addr.ipv4), host->h_addr_list[i], | |
424 | sizeof(temp->addr.ipv4)); | |
425 | temp->addr.ipv4.sin_port = htons(portnum); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Append the address to the list... | |
430 | */ | |
431 | ||
432 | if (!first) | |
433 | first = temp; | |
434 | ||
435 | if (addr) | |
436 | addr->next = temp; | |
437 | ||
438 | addr = temp; | |
439 | } | |
440 | } | |
441 | } | |
442 | #endif /* HAVE_GETADDRINFO */ | |
443 | } | |
444 | ||
445 | /* | |
446 | * Detect some common errors and handle them sanely... | |
447 | */ | |
448 | ||
449 | if (!addr && (!hostname || !strcmp(hostname, "localhost"))) | |
450 | { | |
451 | struct servent *port; /* Port number for service */ | |
452 | int portnum; /* Port number */ | |
453 | ||
454 | ||
455 | /* | |
456 | * Lookup the service... | |
457 | */ | |
458 | ||
459 | if (!service) | |
460 | portnum = 0; | |
461 | else if (isdigit(*service & 255)) | |
462 | portnum = atoi(service); | |
463 | else if ((port = getservbyname(service, NULL)) != NULL) | |
464 | portnum = ntohs(port->s_port); | |
465 | else if (!strcmp(service, "http")) | |
466 | portnum = 80; | |
467 | else if (!strcmp(service, "https")) | |
468 | portnum = 443; | |
469 | else if (!strcmp(service, "ipp")) | |
470 | portnum = 631; | |
471 | else if (!strcmp(service, "lpd")) | |
472 | portnum = 515; | |
473 | else if (!strcmp(service, "socket")) | |
474 | portnum = 9100; | |
475 | else | |
476 | return (NULL); | |
477 | ||
478 | if (hostname && !strcmp(hostname, "localhost")) | |
479 | { | |
480 | /* | |
481 | * Unfortunately, some users ignore all of the warnings in the | |
482 | * /etc/hosts file and delete "localhost" from it. If we get here | |
483 | * then we were unable to resolve the name, so use the IPv6 and/or | |
484 | * IPv4 loopback interface addresses... | |
485 | */ | |
486 | ||
487 | #ifdef AF_INET6 | |
488 | if (family != AF_INET) | |
489 | { | |
490 | /* | |
491 | * Add [::1] to the address list... | |
492 | */ | |
493 | ||
494 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
495 | if (!temp) | |
496 | { | |
497 | httpAddrFreeList(first); | |
498 | return (NULL); | |
499 | } | |
500 | ||
501 | temp->addr.ipv6.sin6_family = AF_INET6; | |
502 | temp->addr.ipv6.sin6_port = htons(portnum); | |
503 | # ifdef WIN32 | |
504 | temp->addr.ipv6.sin6_addr.u.Byte[15] = 1; | |
505 | # else | |
506 | temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1); | |
507 | # endif /* WIN32 */ | |
508 | ||
509 | addr = temp; | |
510 | } | |
511 | ||
512 | if (family != AF_INET6) | |
513 | #endif /* AF_INET6 */ | |
514 | { | |
515 | /* | |
516 | * Add 127.0.0.1 to the address list... | |
517 | */ | |
518 | ||
519 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
520 | if (!temp) | |
521 | { | |
522 | httpAddrFreeList(first); | |
523 | return (NULL); | |
524 | } | |
525 | ||
526 | temp->addr.ipv4.sin_family = AF_INET; | |
527 | temp->addr.ipv4.sin_port = htons(portnum); | |
528 | temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001); | |
529 | ||
530 | if (addr) | |
531 | addr->next = temp; | |
532 | else | |
533 | addr = temp; | |
534 | } | |
535 | } | |
536 | else if (!hostname) | |
537 | { | |
538 | /* | |
539 | * Provide one or more passive listening addresses... | |
540 | */ | |
541 | ||
542 | #ifdef AF_INET6 | |
543 | if (family != AF_INET) | |
544 | { | |
545 | /* | |
546 | * Add [::] to the address list... | |
547 | */ | |
548 | ||
549 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
550 | if (!temp) | |
551 | { | |
552 | httpAddrFreeList(first); | |
553 | return (NULL); | |
554 | } | |
555 | ||
556 | temp->addr.ipv6.sin6_family = AF_INET6; | |
557 | temp->addr.ipv6.sin6_port = htons(portnum); | |
558 | ||
559 | addr = temp; | |
560 | } | |
561 | ||
562 | if (family != AF_INET6) | |
563 | #endif /* AF_INET6 */ | |
564 | { | |
565 | /* | |
566 | * Add 0.0.0.0 to the address list... | |
567 | */ | |
568 | ||
569 | temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t)); | |
570 | if (!temp) | |
571 | { | |
572 | httpAddrFreeList(first); | |
573 | return (NULL); | |
574 | } | |
575 | ||
576 | temp->addr.ipv4.sin_family = AF_INET; | |
577 | temp->addr.ipv4.sin_port = htons(portnum); | |
578 | ||
579 | if (addr) | |
580 | addr->next = temp; | |
581 | else | |
582 | addr = temp; | |
583 | } | |
584 | } | |
585 | } | |
586 | ||
587 | /* | |
588 | * Return the address list... | |
589 | */ | |
590 | ||
591 | return (first); | |
592 | } | |
593 | ||
594 | ||
595 | /* | |
bd7854cb | 596 | * End of "$Id: http-addrlist.c 5103 2006-02-14 19:27:42Z mike $". |
ef416fc2 | 597 | */ |