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ef416fc2 | 1 | /* |
bd7854cb | 2 | * "$Id: network.c 5069 2006-02-04 05:24:35Z mike $" |
ef416fc2 | 3 | * |
4 | * Network interface functions for the Common UNIX Printing System | |
5 | * (CUPS) scheduler. | |
6 | * | |
e00b005a | 7 | * Copyright 1997-2006 by Easy Software Products, all rights reserved. |
ef416fc2 | 8 | * |
9 | * These coded instructions, statements, and computer programs are the | |
10 | * property of Easy Software Products and are protected by Federal | |
11 | * copyright law. Distribution and use rights are outlined in the file | |
12 | * "LICENSE" which should have been included with this file. If this | |
13 | * file is missing or damaged please contact Easy Software Products | |
14 | * at: | |
15 | * | |
16 | * Attn: CUPS Licensing Information | |
17 | * Easy Software Products | |
18 | * 44141 Airport View Drive, Suite 204 | |
19 | * Hollywood, Maryland 20636 USA | |
20 | * | |
21 | * Voice: (301) 373-9600 | |
22 | * EMail: cups-info@cups.org | |
23 | * WWW: http://www.cups.org | |
24 | * | |
25 | * Contents: | |
26 | * | |
27 | * cupsdNetIFFind() - Find a network interface. | |
28 | * cupsdNetIFFree() - Free the current network interface list. | |
29 | * cupsdNetIFUpdate() - Update the network interface list as needed... | |
e00b005a | 30 | * compare_netif() - Compare two network interfaces. |
ef416fc2 | 31 | * getifaddrs() - Get a list of network interfaces on the system. |
32 | * freeifaddrs() - Free an interface list... | |
33 | */ | |
34 | ||
35 | /* | |
36 | * Include necessary headers. | |
37 | */ | |
38 | ||
39 | #include "cupsd.h" | |
40 | ||
41 | #include <net/if.h> | |
42 | ||
e00b005a | 43 | |
44 | /* | |
45 | * Local functions... | |
46 | */ | |
47 | ||
48 | static void cupsdNetIFFree(void); | |
49 | static int compare_netif(cupsd_netif_t *a, cupsd_netif_t *b); | |
50 | ||
51 | ||
ef416fc2 | 52 | #ifdef HAVE_GETIFADDRS |
53 | /* | |
54 | * Use native getifaddrs() function... | |
55 | */ | |
56 | # include <ifaddrs.h> | |
57 | #else | |
58 | /* | |
59 | * Use getifaddrs() emulation... | |
60 | */ | |
61 | ||
62 | # include <sys/ioctl.h> | |
63 | # ifdef HAVE_SYS_SOCKIO_H | |
64 | # include <sys/sockio.h> | |
65 | # endif | |
66 | ||
67 | # ifdef ifa_dstaddr | |
68 | # undef ifa_dstaddr | |
69 | # endif /* ifa_dstaddr */ | |
70 | # ifndef ifr_netmask | |
71 | # define ifr_netmask ifr_addr | |
72 | # endif /* !ifr_netmask */ | |
73 | ||
74 | struct ifaddrs /**** Interface Structure ****/ | |
75 | { | |
76 | struct ifaddrs *ifa_next; /* Next interface in list */ | |
77 | char *ifa_name; /* Name of interface */ | |
78 | unsigned int ifa_flags; /* Flags (up, point-to-point, etc.) */ | |
79 | struct sockaddr *ifa_addr, /* Network address */ | |
80 | *ifa_netmask, /* Address mask */ | |
81 | *ifa_dstaddr; /* Broadcast or destination address */ | |
82 | void *ifa_data; /* Interface statistics */ | |
83 | }; | |
84 | ||
e00b005a | 85 | static int getifaddrs(struct ifaddrs **addrs); |
86 | static void freeifaddrs(struct ifaddrs *addrs); | |
ef416fc2 | 87 | #endif /* HAVE_GETIFADDRS */ |
88 | ||
89 | ||
90 | /* | |
91 | * 'cupsdNetIFFind()' - Find a network interface. | |
92 | */ | |
93 | ||
94 | cupsd_netif_t * /* O - Network interface data */ | |
95 | cupsdNetIFFind(const char *name) /* I - Name of interface */ | |
96 | { | |
e00b005a | 97 | cupsd_netif_t key; /* Search key */ |
ef416fc2 | 98 | |
99 | ||
100 | /* | |
101 | * Update the interface list as needed... | |
102 | */ | |
103 | ||
104 | cupsdNetIFUpdate(); | |
105 | ||
106 | /* | |
107 | * Search for the named interface... | |
108 | */ | |
109 | ||
e00b005a | 110 | strlcpy(key.name, name, sizeof(key.name)); |
ef416fc2 | 111 | |
e00b005a | 112 | return ((cupsd_netif_t *)cupsArrayFind(NetIFList, &key)); |
ef416fc2 | 113 | } |
114 | ||
115 | ||
116 | /* | |
117 | * 'cupsdNetIFFree()' - Free the current network interface list. | |
118 | */ | |
119 | ||
e00b005a | 120 | static void |
ef416fc2 | 121 | cupsdNetIFFree(void) |
122 | { | |
e00b005a | 123 | cupsd_netif_t *current; /* Current interface in array */ |
ef416fc2 | 124 | |
125 | ||
126 | /* | |
127 | * Loop through the interface list and free all the records... | |
128 | */ | |
129 | ||
e00b005a | 130 | for (current = (cupsd_netif_t *)cupsArrayFirst(NetIFList); |
131 | current; | |
132 | current = (cupsd_netif_t *)cupsArrayNext(NetIFList)) | |
ef416fc2 | 133 | { |
e00b005a | 134 | cupsArrayRemove(NetIFList, current); |
135 | free(current); | |
ef416fc2 | 136 | } |
137 | } | |
138 | ||
139 | ||
140 | /* | |
141 | * 'cupsdNetIFUpdate()' - Update the network interface list as needed... | |
142 | */ | |
143 | ||
144 | void | |
145 | cupsdNetIFUpdate(void) | |
146 | { | |
bd7854cb | 147 | int match; /* Matching address? */ |
ef416fc2 | 148 | cupsd_listener_t *lis; /* Listen address */ |
e00b005a | 149 | cupsd_netif_t *temp; /* New interface */ |
ef416fc2 | 150 | struct ifaddrs *addrs, /* Interface address list */ |
151 | *addr; /* Current interface address */ | |
152 | http_addrlist_t *saddr; /* Current server address */ | |
e00b005a | 153 | char hostname[1024]; /* Hostname for address */ |
ef416fc2 | 154 | |
155 | ||
156 | /* | |
157 | * Update the network interface list no more often than once a | |
158 | * minute... | |
159 | */ | |
160 | ||
161 | if ((time(NULL) - NetIFTime) < 60) | |
162 | return; | |
163 | ||
164 | NetIFTime = time(NULL); | |
165 | ||
166 | /* | |
167 | * Free the old interfaces... | |
168 | */ | |
169 | ||
170 | cupsdNetIFFree(); | |
171 | ||
e00b005a | 172 | /* |
173 | * Make sure we have an array... | |
174 | */ | |
175 | ||
176 | if (!NetIFList) | |
177 | NetIFList = cupsArrayNew((cups_array_func_t)compare_netif, NULL); | |
178 | ||
179 | if (!NetIFList) | |
180 | return; | |
181 | ||
ef416fc2 | 182 | /* |
183 | * Grab a new list of interfaces... | |
184 | */ | |
185 | ||
186 | if (getifaddrs(&addrs) < 0) | |
187 | return; | |
188 | ||
189 | for (addr = addrs; addr != NULL; addr = addr->ifa_next) | |
190 | { | |
191 | /* | |
192 | * See if this interface address is IPv4 or IPv6... | |
193 | */ | |
194 | ||
195 | if (addr->ifa_addr == NULL || | |
196 | (addr->ifa_addr->sa_family != AF_INET | |
197 | #ifdef AF_INET6 | |
198 | && addr->ifa_addr->sa_family != AF_INET6 | |
199 | #endif | |
200 | ) || | |
201 | addr->ifa_netmask == NULL || addr->ifa_name == NULL) | |
202 | continue; | |
203 | ||
204 | /* | |
e00b005a | 205 | * Try looking up the hostname for the address as needed... |
ef416fc2 | 206 | */ |
207 | ||
e00b005a | 208 | if (HostNameLookups) |
209 | httpAddrLookup((http_addr_t *)(addr->ifa_addr), hostname, | |
210 | sizeof(hostname)); | |
211 | else | |
212 | { | |
213 | /* | |
214 | * Map the default server address and localhost to the server name | |
215 | * and localhost, respectively; for all other addresses, use the | |
216 | * dotted notation... | |
217 | */ | |
ef416fc2 | 218 | |
e00b005a | 219 | if (httpAddrLocalhost((http_addr_t *)(addr->ifa_addr))) |
220 | strcpy(hostname, "localhost"); | |
221 | else | |
222 | { | |
223 | for (saddr = ServerAddrs; saddr; saddr = saddr->next) | |
224 | if (httpAddrEqual((http_addr_t *)(addr->ifa_addr), &(saddr->addr))) | |
225 | break; | |
ef416fc2 | 226 | |
e00b005a | 227 | if (saddr) |
228 | strlcpy(hostname, ServerName, sizeof(hostname)); | |
229 | else | |
230 | httpAddrString((http_addr_t *)(addr->ifa_addr), hostname, | |
231 | sizeof(hostname)); | |
232 | } | |
233 | } | |
ef416fc2 | 234 | |
e00b005a | 235 | /* |
236 | * Create a new address element... | |
237 | */ | |
ef416fc2 | 238 | |
e00b005a | 239 | if ((temp = calloc(1, sizeof(cupsd_netif_t) + |
240 | strlen(hostname))) == NULL) | |
241 | break; | |
ef416fc2 | 242 | |
243 | /* | |
e00b005a | 244 | * Copy all of the information... |
ef416fc2 | 245 | */ |
246 | ||
247 | strlcpy(temp->name, addr->ifa_name, sizeof(temp->name)); | |
e00b005a | 248 | strcpy(temp->hostname, hostname); /* Safe because hostname is allocated */ |
ef416fc2 | 249 | |
250 | if (addr->ifa_addr->sa_family == AF_INET) | |
251 | { | |
252 | /* | |
253 | * Copy IPv4 addresses... | |
254 | */ | |
255 | ||
256 | memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in)); | |
257 | memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in)); | |
258 | ||
259 | if (addr->ifa_dstaddr) | |
260 | memcpy(&(temp->broadcast), addr->ifa_dstaddr, | |
261 | sizeof(struct sockaddr_in)); | |
262 | } | |
263 | #ifdef AF_INET6 | |
264 | else | |
265 | { | |
266 | /* | |
267 | * Copy IPv6 addresses... | |
268 | */ | |
269 | ||
270 | memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in6)); | |
271 | memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in6)); | |
272 | ||
273 | if (addr->ifa_dstaddr) | |
274 | memcpy(&(temp->broadcast), addr->ifa_dstaddr, | |
275 | sizeof(struct sockaddr_in6)); | |
276 | } | |
277 | #endif /* AF_INET6 */ | |
278 | ||
279 | if (!(addr->ifa_flags & IFF_POINTOPOINT) && | |
280 | !httpAddrLocalhost(&(temp->address))) | |
281 | temp->is_local = 1; | |
282 | ||
283 | /* | |
284 | * Determine which port to use when advertising printers... | |
285 | */ | |
286 | ||
bd7854cb | 287 | for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners); |
288 | lis; | |
289 | lis = (cupsd_listener_t *)cupsArrayNext(Listeners)) | |
ef416fc2 | 290 | { |
291 | match = 0; | |
292 | ||
293 | if (httpAddrAny(&(lis->address))) | |
294 | match = 1; | |
295 | else if (addr->ifa_addr->sa_family == AF_INET && | |
296 | lis->address.addr.sa_family == AF_INET && | |
297 | (lis->address.ipv4.sin_addr.s_addr & | |
298 | temp->mask.ipv4.sin_addr.s_addr) == | |
299 | temp->address.ipv4.sin_addr.s_addr) | |
300 | match = 1; | |
301 | #ifdef AF_INET6 | |
302 | else if (addr->ifa_addr->sa_family == AF_INET6 && | |
303 | lis->address.addr.sa_family == AF_INET6 && | |
304 | (lis->address.ipv6.sin6_addr.s6_addr[0] & | |
305 | temp->mask.ipv6.sin6_addr.s6_addr[0]) == | |
306 | temp->address.ipv6.sin6_addr.s6_addr[0] && | |
307 | (lis->address.ipv6.sin6_addr.s6_addr[1] & | |
308 | temp->mask.ipv6.sin6_addr.s6_addr[1]) == | |
309 | temp->address.ipv6.sin6_addr.s6_addr[1] && | |
310 | (lis->address.ipv6.sin6_addr.s6_addr[2] & | |
311 | temp->mask.ipv6.sin6_addr.s6_addr[2]) == | |
312 | temp->address.ipv6.sin6_addr.s6_addr[2] && | |
313 | (lis->address.ipv6.sin6_addr.s6_addr[3] & | |
314 | temp->mask.ipv6.sin6_addr.s6_addr[3]) == | |
315 | temp->address.ipv6.sin6_addr.s6_addr[3]) | |
316 | match = 1; | |
317 | #endif /* AF_INET6 */ | |
318 | ||
319 | if (match) | |
320 | { | |
321 | if (lis->address.addr.sa_family == AF_INET) | |
322 | temp->port = ntohs(lis->address.ipv4.sin_port); | |
323 | #ifdef AF_INET6 | |
324 | else if (lis->address.addr.sa_family == AF_INET6) | |
325 | temp->port = ntohs(lis->address.ipv6.sin6_port); | |
326 | #endif /* AF_INET6 */ | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
e00b005a | 332 | * Add it to the array... |
ef416fc2 | 333 | */ |
334 | ||
e00b005a | 335 | cupsArrayAdd(NetIFList, temp); |
ef416fc2 | 336 | |
337 | cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdNetIFUpdate: \"%s\" = %s...", | |
338 | temp->name, temp->hostname); | |
339 | } | |
340 | ||
341 | freeifaddrs(addrs); | |
342 | } | |
343 | ||
344 | ||
e00b005a | 345 | /* |
346 | * 'compare_netif()' - Compare two network interfaces. | |
347 | */ | |
348 | ||
349 | static int /* O - Result of comparison */ | |
350 | compare_netif(cupsd_netif_t *a, /* I - First network interface */ | |
351 | cupsd_netif_t *b) /* I - Second network interface */ | |
352 | { | |
353 | return (strcmp(a->name, b->name)); | |
354 | } | |
355 | ||
356 | ||
ef416fc2 | 357 | #ifndef HAVE_GETIFADDRS |
358 | /* | |
359 | * 'getifaddrs()' - Get a list of network interfaces on the system. | |
360 | */ | |
361 | ||
e00b005a | 362 | static int /* O - 0 on success, -1 on error */ |
ef416fc2 | 363 | getifaddrs(struct ifaddrs **addrs) /* O - List of interfaces */ |
364 | { | |
365 | int sock; /* Socket */ | |
366 | char buffer[65536], /* Buffer for address info */ | |
367 | *bufptr, /* Pointer into buffer */ | |
368 | *bufend; /* End of buffer */ | |
369 | struct ifconf conf; /* Interface configurations */ | |
370 | struct sockaddr addr; /* Address data */ | |
371 | struct ifreq *ifp; /* Interface data */ | |
372 | int ifpsize; /* Size of interface data */ | |
373 | struct ifaddrs *temp; /* Pointer to current interface */ | |
374 | struct ifreq request; /* Interface request */ | |
375 | ||
376 | ||
377 | /* | |
378 | * Start with an empty list... | |
379 | */ | |
380 | ||
381 | if (addrs == NULL) | |
382 | return (-1); | |
383 | ||
384 | *addrs = NULL; | |
385 | ||
386 | /* | |
387 | * Create a UDP socket to get the interface data... | |
388 | */ | |
389 | ||
390 | memset (&addr, 0, sizeof(addr)); | |
391 | if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) | |
392 | return (-1); | |
393 | ||
394 | /* | |
395 | * Try to get the list of interfaces... | |
396 | */ | |
397 | ||
398 | conf.ifc_len = sizeof(buffer); | |
399 | conf.ifc_buf = buffer; | |
400 | ||
401 | if (ioctl(sock, SIOCGIFCONF, &conf) < 0) | |
402 | { | |
403 | /* | |
404 | * Couldn't get the list of interfaces... | |
405 | */ | |
406 | ||
407 | close(sock); | |
408 | return (-1); | |
409 | } | |
410 | ||
411 | /* | |
412 | * OK, got the list of interfaces, now lets step through the | |
413 | * buffer to pull them out... | |
414 | */ | |
415 | ||
416 | # ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
417 | # define sockaddr_len(a) ((a)->sa_len) | |
418 | # else | |
419 | # define sockaddr_len(a) (sizeof(struct sockaddr)) | |
420 | # endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
421 | ||
422 | for (bufptr = buffer, bufend = buffer + conf.ifc_len; | |
423 | bufptr < bufend; | |
424 | bufptr += ifpsize) | |
425 | { | |
426 | /* | |
427 | * Get the current interface information... | |
428 | */ | |
429 | ||
430 | ifp = (struct ifreq *)bufptr; | |
431 | ifpsize = sizeof(ifp->ifr_name) + sockaddr_len(&(ifp->ifr_addr)); | |
432 | ||
433 | if (ifpsize < sizeof(struct ifreq)) | |
434 | ifpsize = sizeof(struct ifreq); | |
435 | ||
436 | memset(&request, 0, sizeof(request)); | |
437 | memcpy(request.ifr_name, ifp->ifr_name, sizeof(ifp->ifr_name)); | |
438 | ||
439 | /* | |
440 | * Check the status of the interface... | |
441 | */ | |
442 | ||
443 | if (ioctl(sock, SIOCGIFFLAGS, &request) < 0) | |
444 | continue; | |
445 | ||
446 | /* | |
447 | * Allocate memory for a single interface record... | |
448 | */ | |
449 | ||
450 | if ((temp = calloc(1, sizeof(struct ifaddrs))) == NULL) | |
451 | { | |
452 | /* | |
453 | * Unable to allocate memory... | |
454 | */ | |
455 | ||
456 | close(sock); | |
457 | return (-1); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Add this record to the front of the list and copy the name, flags, | |
462 | * and network address... | |
463 | */ | |
464 | ||
465 | temp->ifa_next = *addrs; | |
466 | *addrs = temp; | |
467 | temp->ifa_name = strdup(ifp->ifr_name); | |
468 | temp->ifa_flags = request.ifr_flags; | |
469 | if ((temp->ifa_addr = calloc(1, sockaddr_len(&(ifp->ifr_addr)))) != NULL) | |
470 | memcpy(temp->ifa_addr, &(ifp->ifr_addr), sockaddr_len(&(ifp->ifr_addr))); | |
471 | ||
472 | /* | |
473 | * Try to get the netmask for the interface... | |
474 | */ | |
475 | ||
476 | if (!ioctl(sock, SIOCGIFNETMASK, &request)) | |
477 | { | |
478 | /* | |
479 | * Got it, make a copy... | |
480 | */ | |
481 | ||
482 | if ((temp->ifa_netmask = calloc(1, sizeof(request.ifr_netmask))) != NULL) | |
483 | memcpy(temp->ifa_netmask, &(request.ifr_netmask), | |
484 | sizeof(request.ifr_netmask)); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Then get the broadcast or point-to-point (destination) address, | |
489 | * if applicable... | |
490 | */ | |
491 | ||
492 | if (temp->ifa_flags & IFF_BROADCAST) | |
493 | { | |
494 | /* | |
495 | * Have a broadcast address, so get it! | |
496 | */ | |
497 | ||
498 | if (!ioctl(sock, SIOCGIFBRDADDR, &request)) | |
499 | { | |
500 | /* | |
501 | * Got it, make a copy... | |
502 | */ | |
503 | ||
504 | if ((temp->ifa_dstaddr = calloc(1, sizeof(request.ifr_broadaddr))) != NULL) | |
505 | memcpy(temp->ifa_dstaddr, &(request.ifr_broadaddr), | |
506 | sizeof(request.ifr_broadaddr)); | |
507 | } | |
508 | } | |
509 | else if (temp->ifa_flags & IFF_POINTOPOINT) | |
510 | { | |
511 | /* | |
512 | * Point-to-point interface; grab the remote address... | |
513 | */ | |
514 | ||
515 | if (!ioctl(sock, SIOCGIFDSTADDR, &request)) | |
516 | { | |
517 | temp->ifa_dstaddr = malloc(sizeof(request.ifr_dstaddr)); | |
518 | memcpy(temp->ifa_dstaddr, &(request.ifr_dstaddr), | |
519 | sizeof(request.ifr_dstaddr)); | |
520 | } | |
521 | } | |
522 | } | |
523 | ||
524 | /* | |
525 | * OK, we're done with the socket, close it and return 0... | |
526 | */ | |
527 | ||
528 | close(sock); | |
529 | ||
530 | return (0); | |
531 | } | |
532 | ||
533 | ||
534 | /* | |
535 | * 'freeifaddrs()' - Free an interface list... | |
536 | */ | |
537 | ||
e00b005a | 538 | static void |
ef416fc2 | 539 | freeifaddrs(struct ifaddrs *addrs) /* I - Interface list to free */ |
540 | { | |
541 | struct ifaddrs *next; /* Next interface in list */ | |
542 | ||
543 | ||
544 | while (addrs != NULL) | |
545 | { | |
546 | /* | |
547 | * Make a copy of the next interface pointer... | |
548 | */ | |
549 | ||
550 | next = addrs->ifa_next; | |
551 | ||
552 | /* | |
553 | * Free data values as needed... | |
554 | */ | |
555 | ||
556 | if (addrs->ifa_name) | |
557 | { | |
558 | free(addrs->ifa_name); | |
559 | addrs->ifa_name = NULL; | |
560 | } | |
561 | ||
562 | if (addrs->ifa_addr) | |
563 | { | |
564 | free(addrs->ifa_addr); | |
565 | addrs->ifa_addr = NULL; | |
566 | } | |
567 | ||
568 | if (addrs->ifa_netmask) | |
569 | { | |
570 | free(addrs->ifa_netmask); | |
571 | addrs->ifa_netmask = NULL; | |
572 | } | |
573 | ||
574 | if (addrs->ifa_dstaddr) | |
575 | { | |
576 | free(addrs->ifa_dstaddr); | |
577 | addrs->ifa_dstaddr = NULL; | |
578 | } | |
579 | ||
580 | /* | |
581 | * Free this node and continue to the next... | |
582 | */ | |
583 | ||
584 | free(addrs); | |
585 | ||
586 | addrs = next; | |
587 | } | |
588 | } | |
589 | #endif /* !HAVE_GETIFADDRS */ | |
590 | ||
591 | ||
592 | /* | |
bd7854cb | 593 | * End of "$Id: network.c 5069 2006-02-04 05:24:35Z mike $". |
ef416fc2 | 594 | */ |