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ef416fc2 | 1 | /* |
2e4ff8af | 2 | * "$Id: http-addr.c 6814 2007-08-20 20:09:25Z mike $" |
ef416fc2 | 3 | * |
4 | * HTTP address routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
bc44d920 | 6 | * Copyright 2007 by Apple Inc. |
ecdc0628 | 7 | * Copyright 1997-2006 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 | * httpAddrAny() - Check for the "any" address. | |
18 | * httpAddrEqual() - Compare two addresses. | |
19 | * httpAddrLocalhost() - Check for the local loopback address. | |
20 | * httpAddrLookup() - Lookup the hostname associated with the address. | |
21 | * httpAddrString() - Convert an IP address to a dotted string. | |
22 | * httpGetHostByName() - Lookup a hostname or IP address, and return | |
23 | * address records for the specified name. | |
24 | * httpGetHostname() - Get the FQDN for the local system. | |
25 | */ | |
26 | ||
27 | /* | |
28 | * Include necessary headers... | |
29 | */ | |
30 | ||
31 | #include "globals.h" | |
32 | #include "debug.h" | |
33 | #include <stdlib.h> | |
34 | #include <stddef.h> | |
35 | ||
36 | ||
37 | /* | |
38 | * 'httpAddrAny()' - Check for the "any" address. | |
39 | * | |
40 | * @since CUPS 1.2@ | |
41 | */ | |
42 | ||
43 | int /* O - 1 if "any", 0 otherwise */ | |
44 | httpAddrAny(const http_addr_t *addr) /* I - Address to check */ | |
45 | { | |
89d46774 | 46 | if (!addr) |
47 | return (0); | |
48 | ||
ef416fc2 | 49 | #ifdef AF_INET6 |
50 | if (addr->addr.sa_family == AF_INET6 && | |
51 | IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr))) | |
52 | return (1); | |
53 | #endif /* AF_INET6 */ | |
54 | ||
55 | if (addr->addr.sa_family == AF_INET && | |
56 | ntohl(addr->ipv4.sin_addr.s_addr) == 0x00000000) | |
57 | return (1); | |
58 | ||
59 | return (0); | |
60 | } | |
61 | ||
62 | ||
63 | /* | |
64 | * 'httpAddrEqual()' - Compare two addresses. | |
65 | * | |
66 | * @since CUPS 1.2@ | |
67 | */ | |
68 | ||
ecdc0628 | 69 | int /* O - 1 if equal, 0 if not */ |
ef416fc2 | 70 | httpAddrEqual(const http_addr_t *addr1, /* I - First address */ |
71 | const http_addr_t *addr2) /* I - Second address */ | |
72 | { | |
89d46774 | 73 | if (!addr1 && !addr2) |
74 | return (1); | |
75 | ||
76 | if (!addr1 || !addr2) | |
77 | return (0); | |
78 | ||
ef416fc2 | 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 | { | |
89d46774 | 105 | if (!addr) |
106 | return (0); | |
107 | ||
ef416fc2 | 108 | #ifdef AF_INET6 |
109 | if (addr->addr.sa_family == AF_INET6) | |
110 | return (sizeof(addr->ipv6)); | |
111 | else | |
112 | #endif /* AF_INET6 */ | |
113 | #ifdef AF_LOCAL | |
114 | if (addr->addr.sa_family == AF_LOCAL) | |
115 | return (offsetof(struct sockaddr_un, sun_path) + | |
116 | strlen(addr->un.sun_path) + 1); | |
117 | else | |
118 | #endif /* AF_LOCAL */ | |
119 | if (addr->addr.sa_family == AF_INET) | |
120 | return (sizeof(addr->ipv4)); | |
121 | else | |
122 | return (0); | |
123 | ||
124 | } | |
125 | ||
126 | ||
127 | /* | |
128 | * 'httpAddrLocalhost()' - Check for the local loopback address. | |
129 | * | |
130 | * @since CUPS 1.2@ | |
131 | */ | |
132 | ||
133 | int /* O - 1 if local host, 0 otherwise */ | |
134 | httpAddrLocalhost( | |
135 | const http_addr_t *addr) /* I - Address to check */ | |
136 | { | |
89d46774 | 137 | if (!addr) |
138 | return (1); | |
139 | ||
ef416fc2 | 140 | #ifdef AF_INET6 |
141 | if (addr->addr.sa_family == AF_INET6 && | |
fa73b229 | 142 | IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr))) |
ef416fc2 | 143 | return (1); |
144 | #endif /* AF_INET6 */ | |
145 | ||
146 | #ifdef AF_LOCAL | |
147 | if (addr->addr.sa_family == AF_LOCAL) | |
148 | return (1); | |
149 | #endif /* AF_LOCAL */ | |
150 | ||
151 | if (addr->addr.sa_family == AF_INET && | |
152 | ntohl(addr->ipv4.sin_addr.s_addr) == 0x7f000001) | |
153 | return (1); | |
154 | ||
155 | return (0); | |
156 | } | |
157 | ||
158 | ||
159 | #ifdef __sgi | |
160 | # define ADDR_CAST (struct sockaddr *) | |
161 | #else | |
162 | # define ADDR_CAST (char *) | |
163 | #endif /* __sgi */ | |
164 | ||
165 | ||
166 | /* | |
167 | * 'httpAddrLookup()' - Lookup the hostname associated with the address. | |
168 | * | |
169 | * @since CUPS 1.2@ | |
170 | */ | |
171 | ||
ecdc0628 | 172 | char * /* O - Host name */ |
173 | httpAddrLookup( | |
174 | const http_addr_t *addr, /* I - Address to lookup */ | |
175 | char *name, /* I - Host name buffer */ | |
176 | int namelen) /* I - Size of name buffer */ | |
ef416fc2 | 177 | { |
178 | DEBUG_printf(("httpAddrLookup(addr=%p, name=%p, namelen=%d)\n", | |
179 | addr, name, namelen)); | |
180 | ||
181 | /* | |
182 | * Range check input... | |
183 | */ | |
184 | ||
185 | if (!addr || !name || namelen <= 2) | |
186 | { | |
187 | if (name && namelen >= 1) | |
188 | *name = '\0'; | |
189 | ||
190 | return (NULL); | |
191 | } | |
192 | ||
193 | #ifdef AF_LOCAL | |
194 | if (addr->addr.sa_family == AF_LOCAL) | |
195 | strlcpy(name, addr->un.sun_path, namelen); | |
196 | else | |
197 | #endif /* AF_LOCAL */ | |
198 | #ifdef HAVE_GETNAMEINFO | |
199 | { | |
db1f069b MS |
200 | /* |
201 | * STR #2486: httpAddrLookup() fails when getnameinfo() returns EAI_AGAIN | |
202 | * | |
203 | * FWIW, I think this is really a bug in the implementation of | |
204 | * getnameinfo(), but falling back on httpAddrString() is easy to | |
205 | * do... | |
206 | */ | |
ef416fc2 | 207 | |
db1f069b MS |
208 | if (getnameinfo(&addr->addr, httpAddrLength(addr), name, namelen, |
209 | NULL, 0, 0)) | |
210 | return (httpAddrString(addr, name, namelen)); | |
ef416fc2 | 211 | } |
212 | #else | |
213 | { | |
214 | struct hostent *host; /* Host from name service */ | |
215 | ||
216 | ||
217 | # ifdef AF_INET6 | |
218 | if (addr->addr.sa_family == AF_INET6) | |
219 | host = gethostbyaddr(ADDR_CAST &(addr->ipv6.sin6_addr), | |
220 | sizeof(struct in_addr), AF_INET6); | |
221 | else | |
222 | # endif /* AF_INET6 */ | |
223 | host = gethostbyaddr(ADDR_CAST &(addr->ipv4.sin_addr), | |
224 | sizeof(struct in_addr), AF_INET); | |
225 | ||
226 | if (host == NULL) | |
227 | { | |
228 | /* | |
229 | * No hostname, so return the raw address... | |
230 | */ | |
231 | ||
232 | httpAddrString(addr, name, namelen); | |
233 | return (NULL); | |
234 | } | |
235 | ||
236 | strlcpy(name, host->h_name, namelen); | |
237 | } | |
238 | #endif /* HAVE_GETNAMEINFO */ | |
239 | ||
240 | return (name); | |
241 | } | |
242 | ||
243 | ||
244 | /* | |
ecdc0628 | 245 | * 'httpAddrString()' - Convert an address to a numeric string. |
ef416fc2 | 246 | * |
247 | * @since CUPS 1.2@ | |
248 | */ | |
249 | ||
ecdc0628 | 250 | char * /* O - Numeric address string */ |
251 | httpAddrString(const http_addr_t *addr, /* I - Address to convert */ | |
252 | char *s, /* I - String buffer */ | |
253 | int slen) /* I - Length of string */ | |
ef416fc2 | 254 | { |
255 | DEBUG_printf(("httpAddrString(addr=%p, s=%p, slen=%d)\n", | |
256 | addr, s, slen)); | |
257 | ||
258 | /* | |
259 | * Range check input... | |
260 | */ | |
261 | ||
262 | if (!addr || !s || slen <= 2) | |
263 | { | |
264 | if (s && slen >= 1) | |
265 | *s = '\0'; | |
266 | ||
267 | return (NULL); | |
268 | } | |
269 | ||
270 | #ifdef AF_LOCAL | |
271 | if (addr->addr.sa_family == AF_LOCAL) | |
272 | strlcpy(s, addr->un.sun_path, slen); | |
273 | else | |
274 | #endif /* AF_LOCAL */ | |
b423cd4c | 275 | if (addr->addr.sa_family == AF_INET) |
ef416fc2 | 276 | { |
b423cd4c | 277 | unsigned temp; /* Temporary address */ |
ef416fc2 | 278 | |
279 | ||
b423cd4c | 280 | temp = ntohl(addr->ipv4.sin_addr.s_addr); |
281 | ||
282 | snprintf(s, slen, "%d.%d.%d.%d", (temp >> 24) & 255, | |
283 | (temp >> 16) & 255, (temp >> 8) & 255, temp & 255); | |
284 | } | |
285 | #ifdef AF_INET6 | |
286 | else if (addr->addr.sa_family == AF_INET6) | |
287 | { | |
288 | # ifdef HAVE_GETNAMEINFO | |
ef416fc2 | 289 | if (getnameinfo(&addr->addr, httpAddrLength(addr), s, slen, |
b423cd4c | 290 | NULL, 0, NI_NUMERICHOST)) |
ef416fc2 | 291 | { |
292 | /* | |
293 | * If we get an error back, then the address type is not supported | |
294 | * and we should zero out the buffer... | |
295 | */ | |
296 | ||
297 | s[0] = '\0'; | |
298 | ||
299 | return (NULL); | |
300 | } | |
b423cd4c | 301 | # else |
302 | char *sptr; /* Pointer into string */ | |
303 | int i; /* Looping var */ | |
304 | unsigned temp; /* Current value */ | |
305 | const char *prefix; /* Prefix for address */ | |
306 | ||
307 | ||
308 | prefix = ""; | |
309 | for (sptr = s, i = 0; i < 4 && addr->ipv6.sin6_addr.s6_addr32[i]; i ++) | |
ef416fc2 | 310 | { |
b423cd4c | 311 | temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]); |
ef416fc2 | 312 | |
b423cd4c | 313 | snprintf(sptr, slen, "%s%x", prefix, (temp >> 16) & 0xffff); |
314 | prefix = ":"; | |
315 | slen -= strlen(sptr); | |
316 | sptr += strlen(sptr); | |
ef416fc2 | 317 | |
b423cd4c | 318 | temp &= 0xffff; |
ef416fc2 | 319 | |
b423cd4c | 320 | if (temp || i == 3 || addr->ipv6.sin6_addr.s6_addr32[i + 1]) |
321 | { | |
322 | snprintf(sptr, slen, "%s%x", prefix, temp); | |
ef416fc2 | 323 | slen -= strlen(sptr); |
324 | sptr += strlen(sptr); | |
ef416fc2 | 325 | } |
b423cd4c | 326 | } |
327 | ||
328 | if (i < 4) | |
329 | { | |
330 | while (i < 4 && !addr->ipv6.sin6_addr.s6_addr32[i]) | |
331 | i ++; | |
ef416fc2 | 332 | |
333 | if (i < 4) | |
334 | { | |
b423cd4c | 335 | snprintf(sptr, slen, "%s:", prefix); |
336 | prefix = ":"; | |
337 | slen -= strlen(sptr); | |
338 | sptr += strlen(sptr); | |
ef416fc2 | 339 | |
b423cd4c | 340 | for (; i < 4; i ++) |
ef416fc2 | 341 | { |
b423cd4c | 342 | temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]); |
ef416fc2 | 343 | |
b423cd4c | 344 | if ((temp & 0xffff0000) || addr->ipv6.sin6_addr.s6_addr32[i - 1]) |
ef416fc2 | 345 | { |
b423cd4c | 346 | snprintf(sptr, slen, "%s%x", prefix, (temp >> 16) & 0xffff); |
ef416fc2 | 347 | slen -= strlen(sptr); |
348 | sptr += strlen(sptr); | |
b423cd4c | 349 | } |
ef416fc2 | 350 | |
b423cd4c | 351 | snprintf(sptr, slen, "%s%x", prefix, temp & 0xffff); |
352 | slen -= strlen(sptr); | |
353 | sptr += strlen(sptr); | |
ef416fc2 | 354 | } |
355 | } | |
b423cd4c | 356 | else if (sptr == s) |
357 | { | |
358 | /* | |
359 | * Empty address... | |
360 | */ | |
ef416fc2 | 361 | |
b423cd4c | 362 | strlcpy(s, "::", slen); |
363 | sptr = s + 2; | |
364 | slen -= 2; | |
365 | } | |
366 | else | |
367 | { | |
368 | /* | |
369 | * Empty at end... | |
370 | */ | |
ef416fc2 | 371 | |
b423cd4c | 372 | strlcpy(sptr, "::", slen); |
373 | sptr += 2; | |
374 | slen -= 2; | |
375 | } | |
ef416fc2 | 376 | } |
b423cd4c | 377 | # endif /* HAVE_GETNAMEINFO */ |
ef416fc2 | 378 | } |
b423cd4c | 379 | #endif /* AF_INET6 */ |
380 | else | |
381 | strlcpy(s, "UNKNOWN", slen); | |
ef416fc2 | 382 | |
383 | DEBUG_printf(("httpAddrString: returning \"%s\"...\n", s)); | |
384 | ||
385 | return (s); | |
386 | } | |
387 | ||
388 | ||
389 | /* | |
390 | * 'httpGetHostByName()' - Lookup a hostname or IPv4 address, and return | |
391 | * address records for the specified name. | |
392 | * | |
393 | * @deprecated@ | |
394 | */ | |
395 | ||
396 | struct hostent * /* O - Host entry */ | |
397 | httpGetHostByName(const char *name) /* I - Hostname or IP address */ | |
398 | { | |
399 | const char *nameptr; /* Pointer into name */ | |
400 | unsigned ip[4]; /* IP address components */ | |
401 | _cups_globals_t *cg = _cupsGlobals(); | |
402 | /* Pointer to library globals */ | |
403 | ||
404 | ||
405 | DEBUG_printf(("httpGetHostByName(name=\"%s\")\n", name)); | |
406 | ||
407 | /* | |
408 | * Avoid lookup delays and configuration problems when connecting | |
409 | * to the localhost address... | |
410 | */ | |
411 | ||
412 | if (!strcmp(name, "localhost")) | |
413 | name = "127.0.0.1"; | |
414 | ||
415 | /* | |
416 | * This function is needed because some operating systems have a | |
417 | * buggy implementation of gethostbyname() that does not support | |
418 | * IP addresses. If the first character of the name string is a | |
419 | * number, then sscanf() is used to extract the IP components. | |
420 | * We then pack the components into an IPv4 address manually, | |
421 | * since the inet_aton() function is deprecated. We use the | |
422 | * htonl() macro to get the right byte order for the address. | |
423 | * | |
424 | * We also support domain sockets when supported by the underlying | |
425 | * OS... | |
426 | */ | |
427 | ||
428 | #ifdef AF_LOCAL | |
429 | if (name[0] == '/') | |
430 | { | |
431 | /* | |
432 | * A domain socket address, so make an AF_LOCAL entry and return it... | |
433 | */ | |
434 | ||
435 | cg->hostent.h_name = (char *)name; | |
436 | cg->hostent.h_aliases = NULL; | |
437 | cg->hostent.h_addrtype = AF_LOCAL; | |
438 | cg->hostent.h_length = strlen(name) + 1; | |
439 | cg->hostent.h_addr_list = cg->ip_ptrs; | |
440 | cg->ip_ptrs[0] = (char *)name; | |
441 | cg->ip_ptrs[1] = NULL; | |
442 | ||
443 | DEBUG_puts("httpGetHostByName: returning domain socket address..."); | |
444 | ||
445 | return (&cg->hostent); | |
446 | } | |
447 | #endif /* AF_LOCAL */ | |
448 | ||
449 | for (nameptr = name; isdigit(*nameptr & 255) || *nameptr == '.'; nameptr ++); | |
450 | ||
451 | if (!*nameptr) | |
452 | { | |
453 | /* | |
454 | * We have an IPv4 address; break it up and provide the host entry | |
455 | * to the caller. | |
456 | */ | |
457 | ||
458 | if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4) | |
459 | return (NULL); /* Must have 4 numbers */ | |
460 | ||
461 | if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255) | |
462 | return (NULL); /* Invalid byte ranges! */ | |
463 | ||
464 | cg->ip_addr = htonl(((((((ip[0] << 8) | ip[1]) << 8) | ip[2]) << 8) | | |
465 | ip[3])); | |
466 | ||
467 | /* | |
468 | * Fill in the host entry and return it... | |
469 | */ | |
470 | ||
471 | cg->hostent.h_name = (char *)name; | |
472 | cg->hostent.h_aliases = NULL; | |
473 | cg->hostent.h_addrtype = AF_INET; | |
474 | cg->hostent.h_length = 4; | |
475 | cg->hostent.h_addr_list = cg->ip_ptrs; | |
476 | cg->ip_ptrs[0] = (char *)&(cg->ip_addr); | |
477 | cg->ip_ptrs[1] = NULL; | |
478 | ||
479 | DEBUG_puts("httpGetHostByName: returning IPv4 address..."); | |
480 | ||
481 | return (&cg->hostent); | |
482 | } | |
483 | else | |
484 | { | |
485 | /* | |
486 | * Use the gethostbyname() function to get the IPv4 address for | |
487 | * the name... | |
488 | */ | |
489 | ||
490 | DEBUG_puts("httpGetHostByName: returning domain lookup address(es)..."); | |
491 | ||
492 | return (gethostbyname(name)); | |
493 | } | |
494 | } | |
495 | ||
496 | ||
497 | /* | |
757d2cad | 498 | * 'httpGetHostname()' - Get the FQDN for the connection or local system. |
ef416fc2 | 499 | * |
757d2cad | 500 | * When "http" points to a connected socket, return the hostname or |
501 | * address that was used in the call to httpConnect() or httpConnectEncrypt(). | |
502 | * Otherwise, return the FQDN for the local system using both gethostname() | |
503 | * and gethostbyname() to get the local hostname with domain. | |
ef416fc2 | 504 | * |
505 | * @since CUPS 1.2@ | |
506 | */ | |
507 | ||
757d2cad | 508 | const char * /* O - FQDN for connection or system */ |
509 | httpGetHostname(http_t *http, /* I - HTTP connection or NULL */ | |
510 | char *s, /* I - String buffer for name */ | |
511 | int slen) /* I - Size of buffer */ | |
ef416fc2 | 512 | { |
513 | struct hostent *host; /* Host entry to get FQDN */ | |
514 | ||
515 | ||
89d46774 | 516 | if (!s || slen <= 1) |
517 | return (NULL); | |
518 | ||
757d2cad | 519 | if (http) |
480ef0fe | 520 | { |
521 | if (http->hostname[0] == '/') | |
522 | strlcpy(s, "localhost", slen); | |
523 | else | |
524 | strlcpy(s, http->hostname, slen); | |
525 | } | |
757d2cad | 526 | else |
ef416fc2 | 527 | { |
528 | /* | |
757d2cad | 529 | * Get the hostname... |
ef416fc2 | 530 | */ |
531 | ||
89d46774 | 532 | if (gethostname(s, slen) < 0) |
533 | strlcpy(s, "localhost", slen); | |
757d2cad | 534 | |
535 | if (!strchr(s, '.')) | |
536 | { | |
537 | /* | |
538 | * The hostname is not a FQDN, so look it up... | |
539 | */ | |
540 | ||
89d46774 | 541 | if ((host = gethostbyname(s)) != NULL && host->h_name) |
757d2cad | 542 | strlcpy(s, host->h_name, slen); |
543 | } | |
ef416fc2 | 544 | } |
545 | ||
546 | /* | |
547 | * Return the hostname with as much domain info as we have... | |
548 | */ | |
549 | ||
550 | return (s); | |
551 | } | |
552 | ||
553 | ||
554 | /* | |
2e4ff8af | 555 | * End of "$Id: http-addr.c 6814 2007-08-20 20:09:25Z mike $". |
ef416fc2 | 556 | */ |