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1 | /* | |
2 | * "$Id: http-addr.c 4806 2005-10-21 18:49:24Z mike $" | |
3 | * | |
4 | * HTTP address routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
6 | * Copyright 1997-2005 by Easy Software Products, all rights reserved. | |
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 | * httpAddrAny() - Check for the "any" address. | |
27 | * httpAddrEqual() - Compare two addresses. | |
28 | * httpAddrLocalhost() - Check for the local loopback address. | |
29 | * httpAddrLookup() - Lookup the hostname associated with the address. | |
30 | * httpAddrString() - Convert an IP address to a dotted string. | |
31 | * httpGetHostByName() - Lookup a hostname or IP address, and return | |
32 | * address records for the specified name. | |
33 | * httpGetHostname() - Get the FQDN for the local system. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * Include necessary headers... | |
38 | */ | |
39 | ||
40 | #include "globals.h" | |
41 | #include "debug.h" | |
42 | #include <stdlib.h> | |
43 | #include <stddef.h> | |
44 | ||
45 | ||
46 | /* | |
47 | * 'httpAddrAny()' - Check for the "any" address. | |
48 | * | |
49 | * @since CUPS 1.2@ | |
50 | */ | |
51 | ||
52 | int /* O - 1 if "any", 0 otherwise */ | |
53 | httpAddrAny(const http_addr_t *addr) /* I - Address to check */ | |
54 | { | |
55 | #ifdef AF_INET6 | |
56 | if (addr->addr.sa_family == AF_INET6 && | |
57 | IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr))) | |
58 | return (1); | |
59 | #endif /* AF_INET6 */ | |
60 | ||
61 | if (addr->addr.sa_family == AF_INET && | |
62 | ntohl(addr->ipv4.sin_addr.s_addr) == 0x00000000) | |
63 | return (1); | |
64 | ||
65 | return (0); | |
66 | } | |
67 | ||
68 | ||
69 | /* | |
70 | * 'httpAddrEqual()' - Compare two addresses. | |
71 | * | |
72 | * @since CUPS 1.2@ | |
73 | */ | |
74 | ||
75 | int /* O - 1 if equal, 0 if != */ | |
76 | httpAddrEqual(const http_addr_t *addr1, /* I - First address */ | |
77 | const http_addr_t *addr2) /* I - Second address */ | |
78 | { | |
79 | if (addr1->addr.sa_family != addr2->addr.sa_family) | |
80 | return (0); | |
81 | ||
82 | #ifdef AF_LOCAL | |
83 | if (addr1->addr.sa_family == AF_LOCAL) | |
84 | return (!strcmp(addr1->un.sun_path, addr2->un.sun_path)); | |
85 | #endif /* AF_LOCAL */ | |
86 | ||
87 | #ifdef AF_INET6 | |
88 | if (addr1->addr.sa_family == AF_INET6) | |
89 | return (!memcmp(&(addr1->ipv6.sin6_addr), &(addr2->ipv6.sin6_addr), 16)); | |
90 | #endif /* AF_INET6 */ | |
91 | ||
92 | return (addr1->ipv4.sin_addr.s_addr == addr2->ipv4.sin_addr.s_addr); | |
93 | } | |
94 | ||
95 | ||
96 | /* | |
97 | * 'httpAddrLength()' - Return the length of the address in bytes. | |
98 | * | |
99 | * @since CUPS 1.2@ | |
100 | */ | |
101 | ||
102 | int /* O - Length in bytes */ | |
103 | httpAddrLength(const http_addr_t *addr) /* I - Address */ | |
104 | { | |
105 | #ifdef AF_INET6 | |
106 | if (addr->addr.sa_family == AF_INET6) | |
107 | return (sizeof(addr->ipv6)); | |
108 | else | |
109 | #endif /* AF_INET6 */ | |
110 | #ifdef AF_LOCAL | |
111 | if (addr->addr.sa_family == AF_LOCAL) | |
112 | return (offsetof(struct sockaddr_un, sun_path) + | |
113 | strlen(addr->un.sun_path) + 1); | |
114 | else | |
115 | #endif /* AF_LOCAL */ | |
116 | if (addr->addr.sa_family == AF_INET) | |
117 | return (sizeof(addr->ipv4)); | |
118 | else | |
119 | return (0); | |
120 | ||
121 | } | |
122 | ||
123 | ||
124 | /* | |
125 | * 'httpAddrLocalhost()' - Check for the local loopback address. | |
126 | * | |
127 | * @since CUPS 1.2@ | |
128 | */ | |
129 | ||
130 | int /* O - 1 if local host, 0 otherwise */ | |
131 | httpAddrLocalhost( | |
132 | const http_addr_t *addr) /* I - Address to check */ | |
133 | { | |
134 | #ifdef AF_INET6 | |
135 | if (addr->addr.sa_family == AF_INET6 && | |
136 | (IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)) || | |
137 | IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr)))) | |
138 | return (1); | |
139 | #endif /* AF_INET6 */ | |
140 | ||
141 | #ifdef AF_LOCAL | |
142 | if (addr->addr.sa_family == AF_LOCAL) | |
143 | return (1); | |
144 | #endif /* AF_LOCAL */ | |
145 | ||
146 | if (addr->addr.sa_family == AF_INET && | |
147 | ntohl(addr->ipv4.sin_addr.s_addr) == 0x7f000001) | |
148 | return (1); | |
149 | ||
150 | return (0); | |
151 | } | |
152 | ||
153 | ||
154 | #ifdef __sgi | |
155 | # define ADDR_CAST (struct sockaddr *) | |
156 | #else | |
157 | # define ADDR_CAST (char *) | |
158 | #endif /* __sgi */ | |
159 | ||
160 | ||
161 | /* | |
162 | * 'httpAddrLookup()' - Lookup the hostname associated with the address. | |
163 | * | |
164 | * @since CUPS 1.2@ | |
165 | */ | |
166 | ||
167 | char * /* O - Host name */ | |
168 | httpAddrLookup(const http_addr_t *addr, /* I - Address to lookup */ | |
169 | char *name, /* I - Host name buffer */ | |
170 | int namelen) /* I - Size of name buffer */ | |
171 | { | |
172 | DEBUG_printf(("httpAddrLookup(addr=%p, name=%p, namelen=%d)\n", | |
173 | addr, name, namelen)); | |
174 | ||
175 | /* | |
176 | * Range check input... | |
177 | */ | |
178 | ||
179 | if (!addr || !name || namelen <= 2) | |
180 | { | |
181 | if (name && namelen >= 1) | |
182 | *name = '\0'; | |
183 | ||
184 | return (NULL); | |
185 | } | |
186 | ||
187 | #ifdef AF_LOCAL | |
188 | if (addr->addr.sa_family == AF_LOCAL) | |
189 | strlcpy(name, addr->un.sun_path, namelen); | |
190 | else | |
191 | #endif /* AF_LOCAL */ | |
192 | #ifdef HAVE_GETNAMEINFO | |
193 | { | |
194 | char servname[1024]; /* Service name (not used) */ | |
195 | ||
196 | ||
197 | if (getnameinfo(&addr->addr, httpAddrLength(addr), name, namelen, | |
198 | servname, sizeof(servname), 0)) | |
199 | { | |
200 | /* | |
201 | * If we get an error back, then the address type is not supported | |
202 | * and we should zero out the buffer... | |
203 | */ | |
204 | ||
205 | name[0] = '\0'; | |
206 | ||
207 | return (NULL); | |
208 | } | |
209 | } | |
210 | #else | |
211 | { | |
212 | struct hostent *host; /* Host from name service */ | |
213 | ||
214 | ||
215 | # ifdef AF_INET6 | |
216 | if (addr->addr.sa_family == AF_INET6) | |
217 | host = gethostbyaddr(ADDR_CAST &(addr->ipv6.sin6_addr), | |
218 | sizeof(struct in_addr), AF_INET6); | |
219 | else | |
220 | # endif /* AF_INET6 */ | |
221 | host = gethostbyaddr(ADDR_CAST &(addr->ipv4.sin_addr), | |
222 | sizeof(struct in_addr), AF_INET); | |
223 | ||
224 | if (host == NULL) | |
225 | { | |
226 | /* | |
227 | * No hostname, so return the raw address... | |
228 | */ | |
229 | ||
230 | httpAddrString(addr, name, namelen); | |
231 | return (NULL); | |
232 | } | |
233 | ||
234 | strlcpy(name, host->h_name, namelen); | |
235 | } | |
236 | #endif /* HAVE_GETNAMEINFO */ | |
237 | ||
238 | return (name); | |
239 | } | |
240 | ||
241 | ||
242 | /* | |
243 | * 'httpAddrString()' - Convert an IP address to a dotted string. | |
244 | * | |
245 | * @since CUPS 1.2@ | |
246 | */ | |
247 | ||
248 | char * /* O - IP string */ | |
249 | httpAddrString(const http_addr_t *addr, /* I - Address to convert */ | |
250 | char *s, /* I - String buffer */ | |
251 | int slen) /* I - Length of string */ | |
252 | { | |
253 | DEBUG_printf(("httpAddrString(addr=%p, s=%p, slen=%d)\n", | |
254 | addr, s, slen)); | |
255 | ||
256 | /* | |
257 | * Range check input... | |
258 | */ | |
259 | ||
260 | if (!addr || !s || slen <= 2) | |
261 | { | |
262 | if (s && slen >= 1) | |
263 | *s = '\0'; | |
264 | ||
265 | return (NULL); | |
266 | } | |
267 | ||
268 | #ifdef AF_LOCAL | |
269 | if (addr->addr.sa_family == AF_LOCAL) | |
270 | strlcpy(s, addr->un.sun_path, slen); | |
271 | else | |
272 | #endif /* AF_LOCAL */ | |
273 | #ifdef HAVE_GETNAMEINFO | |
274 | { | |
275 | char servname[1024]; /* Service name (not used) */ | |
276 | ||
277 | ||
278 | if (getnameinfo(&addr->addr, httpAddrLength(addr), s, slen, | |
279 | servname, sizeof(servname), NI_NUMERICHOST)) | |
280 | { | |
281 | /* | |
282 | * If we get an error back, then the address type is not supported | |
283 | * and we should zero out the buffer... | |
284 | */ | |
285 | ||
286 | s[0] = '\0'; | |
287 | ||
288 | return (NULL); | |
289 | } | |
290 | } | |
291 | #else | |
292 | { | |
293 | #ifdef AF_INET6 | |
294 | if (addr->addr.sa_family == AF_INET6) | |
295 | { | |
296 | char *sptr; /* Pointer into string */ | |
297 | int i; /* Looping var */ | |
298 | unsigned temp; /* Current value */ | |
299 | const char *prefix; /* Prefix for address */ | |
300 | ||
301 | ||
302 | prefix = ""; | |
303 | for (sptr = s, i = 0; i < 4 && addr->ipv6.sin6_addr.s6_addr32[i]; i ++) | |
304 | { | |
305 | temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]); | |
306 | ||
307 | snprintf(sptr, slen, "%s%x", prefix, (temp >> 16) & 0xffff); | |
308 | prefix = ":"; | |
309 | slen -= strlen(sptr); | |
310 | sptr += strlen(sptr); | |
311 | ||
312 | temp &= 0xffff; | |
313 | ||
314 | if (temp || i == 3 || addr->ipv6.sin6_addr.s6_addr32[i + 1]) | |
315 | { | |
316 | snprintf(sptr, slen, "%s%x", prefix, temp); | |
317 | slen -= strlen(sptr); | |
318 | sptr += strlen(sptr); | |
319 | } | |
320 | } | |
321 | ||
322 | if (i < 4) | |
323 | { | |
324 | while (i < 4 && !addr->ipv6.sin6_addr.s6_addr32[i]) | |
325 | i ++; | |
326 | ||
327 | if (i < 4) | |
328 | { | |
329 | snprintf(sptr, slen, "%s:", prefix); | |
330 | prefix = ":"; | |
331 | slen -= strlen(sptr); | |
332 | sptr += strlen(sptr); | |
333 | ||
334 | for (; i < 4; i ++) | |
335 | { | |
336 | temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]); | |
337 | ||
338 | if ((temp & 0xffff0000) || addr->ipv6.sin6_addr.s6_addr32[i - 1]) | |
339 | { | |
340 | snprintf(sptr, slen, "%s%x", prefix, (temp >> 16) & 0xffff); | |
341 | slen -= strlen(sptr); | |
342 | sptr += strlen(sptr); | |
343 | } | |
344 | ||
345 | snprintf(sptr, slen, "%s%x", prefix, temp & 0xffff); | |
346 | slen -= strlen(sptr); | |
347 | sptr += strlen(sptr); | |
348 | } | |
349 | } | |
350 | else if (sptr == s) | |
351 | { | |
352 | /* | |
353 | * Empty address... | |
354 | */ | |
355 | ||
356 | strlcpy(s, "::", slen); | |
357 | sptr = s + 2; | |
358 | slen -= 2; | |
359 | } | |
360 | else | |
361 | { | |
362 | /* | |
363 | * Empty at end... | |
364 | */ | |
365 | ||
366 | strlcpy(sptr, "::", slen); | |
367 | sptr += 2; | |
368 | slen -= 2; | |
369 | } | |
370 | } | |
371 | } | |
372 | else | |
373 | #endif /* AF_INET6 */ | |
374 | if (addr->addr.sa_family == AF_INET) | |
375 | { | |
376 | unsigned temp; /* Temporary address */ | |
377 | ||
378 | ||
379 | temp = ntohl(addr->ipv4.sin_addr.s_addr); | |
380 | ||
381 | snprintf(s, slen, "%d.%d.%d.%d", (temp >> 24) & 255, | |
382 | (temp >> 16) & 255, (temp >> 8) & 255, temp & 255); | |
383 | } | |
384 | else | |
385 | strlcpy(s, "UNKNOWN", slen); | |
386 | } | |
387 | #endif /* HAVE_GETNAMEINFO */ | |
388 | ||
389 | DEBUG_printf(("httpAddrString: returning \"%s\"...\n", s)); | |
390 | ||
391 | return (s); | |
392 | } | |
393 | ||
394 | ||
395 | /* | |
396 | * 'httpGetHostByName()' - Lookup a hostname or IPv4 address, and return | |
397 | * address records for the specified name. | |
398 | * | |
399 | * @deprecated@ | |
400 | */ | |
401 | ||
402 | struct hostent * /* O - Host entry */ | |
403 | httpGetHostByName(const char *name) /* I - Hostname or IP address */ | |
404 | { | |
405 | const char *nameptr; /* Pointer into name */ | |
406 | unsigned ip[4]; /* IP address components */ | |
407 | _cups_globals_t *cg = _cupsGlobals(); | |
408 | /* Pointer to library globals */ | |
409 | ||
410 | ||
411 | DEBUG_printf(("httpGetHostByName(name=\"%s\")\n", name)); | |
412 | ||
413 | /* | |
414 | * Avoid lookup delays and configuration problems when connecting | |
415 | * to the localhost address... | |
416 | */ | |
417 | ||
418 | if (!strcmp(name, "localhost")) | |
419 | name = "127.0.0.1"; | |
420 | ||
421 | /* | |
422 | * This function is needed because some operating systems have a | |
423 | * buggy implementation of gethostbyname() that does not support | |
424 | * IP addresses. If the first character of the name string is a | |
425 | * number, then sscanf() is used to extract the IP components. | |
426 | * We then pack the components into an IPv4 address manually, | |
427 | * since the inet_aton() function is deprecated. We use the | |
428 | * htonl() macro to get the right byte order for the address. | |
429 | * | |
430 | * We also support domain sockets when supported by the underlying | |
431 | * OS... | |
432 | */ | |
433 | ||
434 | #ifdef AF_LOCAL | |
435 | if (name[0] == '/') | |
436 | { | |
437 | /* | |
438 | * A domain socket address, so make an AF_LOCAL entry and return it... | |
439 | */ | |
440 | ||
441 | cg->hostent.h_name = (char *)name; | |
442 | cg->hostent.h_aliases = NULL; | |
443 | cg->hostent.h_addrtype = AF_LOCAL; | |
444 | cg->hostent.h_length = strlen(name) + 1; | |
445 | cg->hostent.h_addr_list = cg->ip_ptrs; | |
446 | cg->ip_ptrs[0] = (char *)name; | |
447 | cg->ip_ptrs[1] = NULL; | |
448 | ||
449 | DEBUG_puts("httpGetHostByName: returning domain socket address..."); | |
450 | ||
451 | return (&cg->hostent); | |
452 | } | |
453 | #endif /* AF_LOCAL */ | |
454 | ||
455 | for (nameptr = name; isdigit(*nameptr & 255) || *nameptr == '.'; nameptr ++); | |
456 | ||
457 | if (!*nameptr) | |
458 | { | |
459 | /* | |
460 | * We have an IPv4 address; break it up and provide the host entry | |
461 | * to the caller. | |
462 | */ | |
463 | ||
464 | if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4) | |
465 | return (NULL); /* Must have 4 numbers */ | |
466 | ||
467 | if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255) | |
468 | return (NULL); /* Invalid byte ranges! */ | |
469 | ||
470 | cg->ip_addr = htonl(((((((ip[0] << 8) | ip[1]) << 8) | ip[2]) << 8) | | |
471 | ip[3])); | |
472 | ||
473 | /* | |
474 | * Fill in the host entry and return it... | |
475 | */ | |
476 | ||
477 | cg->hostent.h_name = (char *)name; | |
478 | cg->hostent.h_aliases = NULL; | |
479 | cg->hostent.h_addrtype = AF_INET; | |
480 | cg->hostent.h_length = 4; | |
481 | cg->hostent.h_addr_list = cg->ip_ptrs; | |
482 | cg->ip_ptrs[0] = (char *)&(cg->ip_addr); | |
483 | cg->ip_ptrs[1] = NULL; | |
484 | ||
485 | DEBUG_puts("httpGetHostByName: returning IPv4 address..."); | |
486 | ||
487 | return (&cg->hostent); | |
488 | } | |
489 | else | |
490 | { | |
491 | /* | |
492 | * Use the gethostbyname() function to get the IPv4 address for | |
493 | * the name... | |
494 | */ | |
495 | ||
496 | DEBUG_puts("httpGetHostByName: returning domain lookup address(es)..."); | |
497 | ||
498 | return (gethostbyname(name)); | |
499 | } | |
500 | } | |
501 | ||
502 | ||
503 | /* | |
504 | * 'httpGetHostname()' - Get the FQDN for the local system. | |
505 | * | |
506 | * This function uses both gethostname() and gethostbyname() to | |
507 | * get the local hostname with domain. | |
508 | * | |
509 | * @since CUPS 1.2@ | |
510 | */ | |
511 | ||
512 | const char * /* O - FQDN for this system */ | |
513 | httpGetHostname(char *s, /* I - String buffer for name */ | |
514 | int slen) /* I - Size of buffer */ | |
515 | { | |
516 | struct hostent *host; /* Host entry to get FQDN */ | |
517 | ||
518 | ||
519 | /* | |
520 | * Get the hostname... | |
521 | */ | |
522 | ||
523 | gethostname(s, slen); | |
524 | ||
525 | if (!strchr(s, '.')) | |
526 | { | |
527 | /* | |
528 | * The hostname is not a FQDN, so look it up... | |
529 | */ | |
530 | ||
531 | if ((host = gethostbyname(s)) != NULL) | |
532 | strlcpy(s, host->h_name, slen); | |
533 | } | |
534 | ||
535 | /* | |
536 | * Return the hostname with as much domain info as we have... | |
537 | */ | |
538 | ||
539 | return (s); | |
540 | } | |
541 | ||
542 | ||
543 | /* | |
544 | * End of "$Id: http-addr.c 4806 2005-10-21 18:49:24Z mike $". | |
545 | */ |