1 /*-------------------------------------------------------------------------
2 *
3 * ip.c
4 * IPv6-aware network access.
5 *
6 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/libpq/ip.c
12 *
13 * This file and the IPV6 implementation were initially provided by
14 * Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
15 * http://www.lbsd.net.
16 *
17 *-------------------------------------------------------------------------
18 */
19
20 /* This is intended to be used in both frontend and backend, so use c.h */
21 #include "c.h"
22
23 #include <unistd.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <sys/socket.h>
27 #include <netdb.h>
28 #include <netinet/in.h>
29 #ifdef HAVE_NETINET_TCP_H
30 #include <netinet/tcp.h>
31 #endif
32 #include <arpa/inet.h>
33 #include <sys/file.h>
34
35 #include "libpq/ip.h"
36
37
38 static int range_sockaddr_AF_INET(const struct sockaddr_in * addr,
39 const struct sockaddr_in * netaddr,
40 const struct sockaddr_in * netmask);
41
42 #ifdef HAVE_IPV6
43 static int range_sockaddr_AF_INET6(const struct sockaddr_in6 * addr,
44 const struct sockaddr_in6 * netaddr,
45 const struct sockaddr_in6 * netmask);
46 #endif
47
48 #ifdef HAVE_UNIX_SOCKETS
49 static int getaddrinfo_unix(const char *path,
50 const struct addrinfo * hintsp,
51 struct addrinfo ** result);
52
53 static int getnameinfo_unix(const struct sockaddr_un * sa, int salen,
54 char *node, int nodelen,
55 char *service, int servicelen,
56 int flags);
57 #endif
58
59
60 /*
61 * pg_getaddrinfo_all - get address info for Unix, IPv4 and IPv6 sockets
62 */
63 int
pg_getaddrinfo_all(const char * hostname,const char * servname,const struct addrinfo * hintp,struct addrinfo ** result)64 pg_getaddrinfo_all(const char *hostname, const char *servname,
65 const struct addrinfo * hintp, struct addrinfo ** result)
66 {
67 int rc;
68
69 /* not all versions of getaddrinfo() zero *result on failure */
70 *result = NULL;
71
72 #ifdef HAVE_UNIX_SOCKETS
73 if (hintp->ai_family == AF_UNIX)
74 return getaddrinfo_unix(servname, hintp, result);
75 #endif
76
77 /* NULL has special meaning to getaddrinfo(). */
78 rc = getaddrinfo((!hostname || hostname[0] == '\0') ? NULL : hostname,
79 servname, hintp, result);
80
81 return rc;
82 }
83
84
85 /*
86 * pg_freeaddrinfo_all - free addrinfo structures for IPv4, IPv6, or Unix
87 *
88 * Note: the ai_family field of the original hint structure must be passed
89 * so that we can tell whether the addrinfo struct was built by the system's
90 * getaddrinfo() routine or our own getaddrinfo_unix() routine. Some versions
91 * of getaddrinfo() might be willing to return AF_UNIX addresses, so it's
92 * not safe to look at ai_family in the addrinfo itself.
93 */
94 void
pg_freeaddrinfo_all(int hint_ai_family,struct addrinfo * ai)95 pg_freeaddrinfo_all(int hint_ai_family, struct addrinfo * ai)
96 {
97 #ifdef HAVE_UNIX_SOCKETS
98 if (hint_ai_family == AF_UNIX)
99 {
100 /* struct was built by getaddrinfo_unix (see pg_getaddrinfo_all) */
101 while (ai != NULL)
102 {
103 struct addrinfo *p = ai;
104
105 ai = ai->ai_next;
106 free(p->ai_addr);
107 free(p);
108 }
109 }
110 else
111 #endif /* HAVE_UNIX_SOCKETS */
112 {
113 /* struct was built by getaddrinfo() */
114 if (ai != NULL)
115 freeaddrinfo(ai);
116 }
117 }
118
119
120 /*
121 * pg_getnameinfo_all - get name info for Unix, IPv4 and IPv6 sockets
122 *
123 * The API of this routine differs from the standard getnameinfo() definition
124 * in two ways: first, the addr parameter is declared as sockaddr_storage
125 * rather than struct sockaddr, and second, the node and service fields are
126 * guaranteed to be filled with something even on failure return.
127 */
128 int
pg_getnameinfo_all(const struct sockaddr_storage * addr,int salen,char * node,int nodelen,char * service,int servicelen,int flags)129 pg_getnameinfo_all(const struct sockaddr_storage * addr, int salen,
130 char *node, int nodelen,
131 char *service, int servicelen,
132 int flags)
133 {
134 int rc;
135
136 #ifdef HAVE_UNIX_SOCKETS
137 if (addr && addr->ss_family == AF_UNIX)
138 rc = getnameinfo_unix((const struct sockaddr_un *) addr, salen,
139 node, nodelen,
140 service, servicelen,
141 flags);
142 else
143 #endif
144 rc = getnameinfo((const struct sockaddr *) addr, salen,
145 node, nodelen,
146 service, servicelen,
147 flags);
148
149 if (rc != 0)
150 {
151 if (node)
152 strlcpy(node, "???", nodelen);
153 if (service)
154 strlcpy(service, "???", servicelen);
155 }
156
157 return rc;
158 }
159
160
161 #if defined(HAVE_UNIX_SOCKETS)
162
163 /* -------
164 * getaddrinfo_unix - get unix socket info using IPv6-compatible API
165 *
166 * Bugs: only one addrinfo is set even though hintsp is NULL or
167 * ai_socktype is 0
168 * AI_CANONNAME is not supported.
169 * -------
170 */
171 static int
getaddrinfo_unix(const char * path,const struct addrinfo * hintsp,struct addrinfo ** result)172 getaddrinfo_unix(const char *path, const struct addrinfo * hintsp,
173 struct addrinfo ** result)
174 {
175 struct addrinfo hints;
176 struct addrinfo *aip;
177 struct sockaddr_un *unp;
178
179 *result = NULL;
180
181 MemSet(&hints, 0, sizeof(hints));
182
183 if (strlen(path) >= sizeof(unp->sun_path))
184 return EAI_FAIL;
185
186 if (hintsp == NULL)
187 {
188 hints.ai_family = AF_UNIX;
189 hints.ai_socktype = SOCK_STREAM;
190 }
191 else
192 memcpy(&hints, hintsp, sizeof(hints));
193
194 if (hints.ai_socktype == 0)
195 hints.ai_socktype = SOCK_STREAM;
196
197 if (hints.ai_family != AF_UNIX)
198 {
199 /* shouldn't have been called */
200 return EAI_FAIL;
201 }
202
203 aip = calloc(1, sizeof(struct addrinfo));
204 if (aip == NULL)
205 return EAI_MEMORY;
206
207 unp = calloc(1, sizeof(struct sockaddr_un));
208 if (unp == NULL)
209 {
210 free(aip);
211 return EAI_MEMORY;
212 }
213
214 aip->ai_family = AF_UNIX;
215 aip->ai_socktype = hints.ai_socktype;
216 aip->ai_protocol = hints.ai_protocol;
217 aip->ai_next = NULL;
218 aip->ai_canonname = NULL;
219 *result = aip;
220
221 unp->sun_family = AF_UNIX;
222 aip->ai_addr = (struct sockaddr *) unp;
223 aip->ai_addrlen = sizeof(struct sockaddr_un);
224
225 strcpy(unp->sun_path, path);
226
227 #ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
228 unp->sun_len = sizeof(struct sockaddr_un);
229 #endif
230
231 return 0;
232 }
233
234 /*
235 * Convert an address to a hostname.
236 */
237 static int
getnameinfo_unix(const struct sockaddr_un * sa,int salen,char * node,int nodelen,char * service,int servicelen,int flags)238 getnameinfo_unix(const struct sockaddr_un * sa, int salen,
239 char *node, int nodelen,
240 char *service, int servicelen,
241 int flags)
242 {
243 int ret;
244
245 /* Invalid arguments. */
246 if (sa == NULL || sa->sun_family != AF_UNIX ||
247 (node == NULL && service == NULL))
248 return EAI_FAIL;
249
250 if (node)
251 {
252 ret = snprintf(node, nodelen, "%s", "[local]");
253 if (ret < 0 || ret >= nodelen)
254 return EAI_MEMORY;
255 }
256
257 if (service)
258 {
259 ret = snprintf(service, servicelen, "%s", sa->sun_path);
260 if (ret < 0 || ret >= servicelen)
261 return EAI_MEMORY;
262 }
263
264 return 0;
265 }
266 #endif /* HAVE_UNIX_SOCKETS */
267
268
269 /*
270 * pg_range_sockaddr - is addr within the subnet specified by netaddr/netmask ?
271 *
272 * Note: caller must already have verified that all three addresses are
273 * in the same address family; and AF_UNIX addresses are not supported.
274 */
275 int
pg_range_sockaddr(const struct sockaddr_storage * addr,const struct sockaddr_storage * netaddr,const struct sockaddr_storage * netmask)276 pg_range_sockaddr(const struct sockaddr_storage * addr,
277 const struct sockaddr_storage * netaddr,
278 const struct sockaddr_storage * netmask)
279 {
280 if (addr->ss_family == AF_INET)
281 return range_sockaddr_AF_INET((const struct sockaddr_in *) addr,
282 (const struct sockaddr_in *) netaddr,
283 (const struct sockaddr_in *) netmask);
284 #ifdef HAVE_IPV6
285 else if (addr->ss_family == AF_INET6)
286 return range_sockaddr_AF_INET6((const struct sockaddr_in6 *) addr,
287 (const struct sockaddr_in6 *) netaddr,
288 (const struct sockaddr_in6 *) netmask);
289 #endif
290 else
291 return 0;
292 }
293
294 static int
range_sockaddr_AF_INET(const struct sockaddr_in * addr,const struct sockaddr_in * netaddr,const struct sockaddr_in * netmask)295 range_sockaddr_AF_INET(const struct sockaddr_in * addr,
296 const struct sockaddr_in * netaddr,
297 const struct sockaddr_in * netmask)
298 {
299 if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) &
300 netmask->sin_addr.s_addr) == 0)
301 return 1;
302 else
303 return 0;
304 }
305
306
307 #ifdef HAVE_IPV6
308
309 static int
range_sockaddr_AF_INET6(const struct sockaddr_in6 * addr,const struct sockaddr_in6 * netaddr,const struct sockaddr_in6 * netmask)310 range_sockaddr_AF_INET6(const struct sockaddr_in6 * addr,
311 const struct sockaddr_in6 * netaddr,
312 const struct sockaddr_in6 * netmask)
313 {
314 int i;
315
316 for (i = 0; i < 16; i++)
317 {
318 if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) &
319 netmask->sin6_addr.s6_addr[i]) != 0)
320 return 0;
321 }
322
323 return 1;
324 }
325 #endif /* HAVE_IPV6 */
326
327 /*
328 * pg_sockaddr_cidr_mask - make a network mask of the appropriate family
329 * and required number of significant bits
330 *
331 * numbits can be null, in which case the mask is fully set.
332 *
333 * The resulting mask is placed in *mask, which had better be big enough.
334 *
335 * Return value is 0 if okay, -1 if not.
336 */
337 int
pg_sockaddr_cidr_mask(struct sockaddr_storage * mask,char * numbits,int family)338 pg_sockaddr_cidr_mask(struct sockaddr_storage * mask, char *numbits, int family)
339 {
340 long bits;
341 char *endptr;
342
343 if (numbits == NULL)
344 {
345 bits = (family == AF_INET) ? 32 : 128;
346 }
347 else
348 {
349 bits = strtol(numbits, &endptr, 10);
350 if (*numbits == '\0' || *endptr != '\0')
351 return -1;
352 }
353
354 switch (family)
355 {
356 case AF_INET:
357 {
358 struct sockaddr_in mask4;
359 long maskl;
360
361 if (bits < 0 || bits > 32)
362 return -1;
363 memset(&mask4, 0, sizeof(mask4));
364 /* avoid "x << 32", which is not portable */
365 if (bits > 0)
366 maskl = (0xffffffffUL << (32 - (int) bits))
367 & 0xffffffffUL;
368 else
369 maskl = 0;
370 mask4.sin_addr.s_addr = htonl(maskl);
371 memcpy(mask, &mask4, sizeof(mask4));
372 break;
373 }
374
375 #ifdef HAVE_IPV6
376 case AF_INET6:
377 {
378 struct sockaddr_in6 mask6;
379 int i;
380
381 if (bits < 0 || bits > 128)
382 return -1;
383 memset(&mask6, 0, sizeof(mask6));
384 for (i = 0; i < 16; i++)
385 {
386 if (bits <= 0)
387 mask6.sin6_addr.s6_addr[i] = 0;
388 else if (bits >= 8)
389 mask6.sin6_addr.s6_addr[i] = 0xff;
390 else
391 {
392 mask6.sin6_addr.s6_addr[i] =
393 (0xff << (8 - (int) bits)) & 0xff;
394 }
395 bits -= 8;
396 }
397 memcpy(mask, &mask6, sizeof(mask6));
398 break;
399 }
400 #endif
401 default:
402 return -1;
403 }
404
405 mask->ss_family = family;
406 return 0;
407 }
408
409
410 /*
411 * Run the callback function for the addr/mask, after making sure the
412 * mask is sane for the addr.
413 */
414 static void
run_ifaddr_callback(PgIfAddrCallback callback,void * cb_data,struct sockaddr * addr,struct sockaddr * mask)415 run_ifaddr_callback(PgIfAddrCallback callback, void *cb_data,
416 struct sockaddr * addr, struct sockaddr * mask)
417 {
418 struct sockaddr_storage fullmask;
419
420 if (!addr)
421 return;
422
423 /* Check that the mask is valid */
424 if (mask)
425 {
426 if (mask->sa_family != addr->sa_family)
427 {
428 mask = NULL;
429 }
430 else if (mask->sa_family == AF_INET)
431 {
432 if (((struct sockaddr_in *) mask)->sin_addr.s_addr == INADDR_ANY)
433 mask = NULL;
434 }
435 #ifdef HAVE_IPV6
436 else if (mask->sa_family == AF_INET6)
437 {
438 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) mask)->sin6_addr))
439 mask = NULL;
440 }
441 #endif
442 }
443
444 /* If mask is invalid, generate our own fully-set mask */
445 if (!mask)
446 {
447 pg_sockaddr_cidr_mask(&fullmask, NULL, addr->sa_family);
448 mask = (struct sockaddr *) & fullmask;
449 }
450
451 (*callback) (addr, mask, cb_data);
452 }
453
454 #ifdef WIN32
455
456 #include <winsock2.h>
457 #include <ws2tcpip.h>
458
459 /*
460 * Enumerate the system's network interface addresses and call the callback
461 * for each one. Returns 0 if successful, -1 if trouble.
462 *
463 * This version is for Win32. Uses the Winsock 2 functions (ie: ws2_32.dll)
464 */
465 int
pg_foreach_ifaddr(PgIfAddrCallback callback,void * cb_data)466 pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
467 {
468 INTERFACE_INFO *ptr,
469 *ii = NULL;
470 unsigned long length,
471 i;
472 unsigned long n_ii = 0;
473 SOCKET sock;
474 int error;
475
476 sock = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
477 if (sock == INVALID_SOCKET)
478 return -1;
479
480 while (n_ii < 1024)
481 {
482 n_ii += 64;
483 ptr = realloc(ii, sizeof(INTERFACE_INFO) * n_ii);
484 if (!ptr)
485 {
486 free(ii);
487 closesocket(sock);
488 errno = ENOMEM;
489 return -1;
490 }
491
492 ii = ptr;
493 if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, 0, 0,
494 ii, n_ii * sizeof(INTERFACE_INFO),
495 &length, 0, 0) == SOCKET_ERROR)
496 {
497 error = WSAGetLastError();
498 if (error == WSAEFAULT || error == WSAENOBUFS)
499 continue; /* need to make the buffer bigger */
500 closesocket(sock);
501 free(ii);
502 return -1;
503 }
504
505 break;
506 }
507
508 for (i = 0; i < length / sizeof(INTERFACE_INFO); ++i)
509 run_ifaddr_callback(callback, cb_data,
510 (struct sockaddr *) & ii[i].iiAddress,
511 (struct sockaddr *) & ii[i].iiNetmask);
512
513 closesocket(sock);
514 free(ii);
515 return 0;
516 }
517 #elif HAVE_GETIFADDRS /* && !WIN32 */
518
519 #ifdef HAVE_IFADDRS_H
520 #include <ifaddrs.h>
521 #endif
522
523 /*
524 * Enumerate the system's network interface addresses and call the callback
525 * for each one. Returns 0 if successful, -1 if trouble.
526 *
527 * This version uses the getifaddrs() interface, which is available on
528 * BSDs, AIX, and modern Linux.
529 */
530 int
pg_foreach_ifaddr(PgIfAddrCallback callback,void * cb_data)531 pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
532 {
533 struct ifaddrs *ifa,
534 *l;
535
536 if (getifaddrs(&ifa) < 0)
537 return -1;
538
539 for (l = ifa; l; l = l->ifa_next)
540 run_ifaddr_callback(callback, cb_data,
541 l->ifa_addr, l->ifa_netmask);
542
543 freeifaddrs(ifa);
544 return 0;
545 }
546 #else /* !HAVE_GETIFADDRS && !WIN32 */
547
548 #ifdef HAVE_SYS_IOCTL_H
549 #include <sys/ioctl.h>
550 #endif
551
552 #ifdef HAVE_NET_IF_H
553 #include <net/if.h>
554 #endif
555
556 #ifdef HAVE_SYS_SOCKIO_H
557 #include <sys/sockio.h>
558 #endif
559
560 /*
561 * SIOCGIFCONF does not return IPv6 addresses on Solaris
562 * and HP/UX. So we prefer SIOCGLIFCONF if it's available.
563 *
564 * On HP/UX, however, it *only* returns IPv6 addresses,
565 * and the structs are named slightly differently too.
566 * We'd have to do another call with SIOCGIFCONF to get the
567 * IPv4 addresses as well. We don't currently bother, just
568 * fall back to SIOCGIFCONF on HP/UX.
569 */
570
571 #if defined(SIOCGLIFCONF) && !defined(__hpux)
572
573 /*
574 * Enumerate the system's network interface addresses and call the callback
575 * for each one. Returns 0 if successful, -1 if trouble.
576 *
577 * This version uses ioctl(SIOCGLIFCONF).
578 */
579 int
pg_foreach_ifaddr(PgIfAddrCallback callback,void * cb_data)580 pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
581 {
582 struct lifconf lifc;
583 struct lifreq *lifr,
584 lmask;
585 struct sockaddr *addr,
586 *mask;
587 char *ptr,
588 *buffer = NULL;
589 size_t n_buffer = 1024;
590 pgsocket sock,
591 fd;
592
593 #ifdef HAVE_IPV6
594 pgsocket sock6;
595 #endif
596 int i,
597 total;
598
599 sock = socket(AF_INET, SOCK_DGRAM, 0);
600 if (sock == PGINVALID_SOCKET)
601 return -1;
602
603 while (n_buffer < 1024 * 100)
604 {
605 n_buffer += 1024;
606 ptr = realloc(buffer, n_buffer);
607 if (!ptr)
608 {
609 free(buffer);
610 close(sock);
611 errno = ENOMEM;
612 return -1;
613 }
614
615 memset(&lifc, 0, sizeof(lifc));
616 lifc.lifc_family = AF_UNSPEC;
617 lifc.lifc_buf = buffer = ptr;
618 lifc.lifc_len = n_buffer;
619
620 if (ioctl(sock, SIOCGLIFCONF, &lifc) < 0)
621 {
622 if (errno == EINVAL)
623 continue;
624 free(buffer);
625 close(sock);
626 return -1;
627 }
628
629 /*
630 * Some Unixes try to return as much data as possible, with no
631 * indication of whether enough space allocated. Don't believe we have
632 * it all unless there's lots of slop.
633 */
634 if (lifc.lifc_len < n_buffer - 1024)
635 break;
636 }
637
638 #ifdef HAVE_IPV6
639 /* We'll need an IPv6 socket too for the SIOCGLIFNETMASK ioctls */
640 sock6 = socket(AF_INET6, SOCK_DGRAM, 0);
641 if (sock6 == PGINVALID_SOCKET)
642 {
643 free(buffer);
644 close(sock);
645 return -1;
646 }
647 #endif
648
649 total = lifc.lifc_len / sizeof(struct lifreq);
650 lifr = lifc.lifc_req;
651 for (i = 0; i < total; ++i)
652 {
653 addr = (struct sockaddr *) & lifr[i].lifr_addr;
654 memcpy(&lmask, &lifr[i], sizeof(struct lifreq));
655 #ifdef HAVE_IPV6
656 fd = (addr->sa_family == AF_INET6) ? sock6 : sock;
657 #else
658 fd = sock;
659 #endif
660 if (ioctl(fd, SIOCGLIFNETMASK, &lmask) < 0)
661 mask = NULL;
662 else
663 mask = (struct sockaddr *) & lmask.lifr_addr;
664 run_ifaddr_callback(callback, cb_data, addr, mask);
665 }
666
667 free(buffer);
668 close(sock);
669 #ifdef HAVE_IPV6
670 close(sock6);
671 #endif
672 return 0;
673 }
674 #elif defined(SIOCGIFCONF)
675
676 /*
677 * Remaining Unixes use SIOCGIFCONF. Some only return IPv4 information
678 * here, so this is the least preferred method. Note that there is no
679 * standard way to iterate the struct ifreq returned in the array.
680 * On some OSs the structures are padded large enough for any address,
681 * on others you have to calculate the size of the struct ifreq.
682 */
683
684 /* Some OSs have _SIZEOF_ADDR_IFREQ, so just use that */
685 #ifndef _SIZEOF_ADDR_IFREQ
686
687 /* Calculate based on sockaddr.sa_len */
688 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
689 #define _SIZEOF_ADDR_IFREQ(ifr) \
690 ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
691 (sizeof(struct ifreq) - sizeof(struct sockaddr) + \
692 (ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
693
694 /* Padded ifreq structure, simple */
695 #else
696 #define _SIZEOF_ADDR_IFREQ(ifr) \
697 sizeof (struct ifreq)
698 #endif
699 #endif /* !_SIZEOF_ADDR_IFREQ */
700
701 /*
702 * Enumerate the system's network interface addresses and call the callback
703 * for each one. Returns 0 if successful, -1 if trouble.
704 *
705 * This version uses ioctl(SIOCGIFCONF).
706 */
707 int
pg_foreach_ifaddr(PgIfAddrCallback callback,void * cb_data)708 pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
709 {
710 struct ifconf ifc;
711 struct ifreq *ifr,
712 *end,
713 addr,
714 mask;
715 char *ptr,
716 *buffer = NULL;
717 size_t n_buffer = 1024;
718 pgsocket sock;
719
720 sock = socket(AF_INET, SOCK_DGRAM, 0);
721 if (sock == PGINVALID_SOCKET)
722 return -1;
723
724 while (n_buffer < 1024 * 100)
725 {
726 n_buffer += 1024;
727 ptr = realloc(buffer, n_buffer);
728 if (!ptr)
729 {
730 free(buffer);
731 close(sock);
732 errno = ENOMEM;
733 return -1;
734 }
735
736 memset(&ifc, 0, sizeof(ifc));
737 ifc.ifc_buf = buffer = ptr;
738 ifc.ifc_len = n_buffer;
739
740 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0)
741 {
742 if (errno == EINVAL)
743 continue;
744 free(buffer);
745 close(sock);
746 return -1;
747 }
748
749 /*
750 * Some Unixes try to return as much data as possible, with no
751 * indication of whether enough space allocated. Don't believe we have
752 * it all unless there's lots of slop.
753 */
754 if (ifc.ifc_len < n_buffer - 1024)
755 break;
756 }
757
758 end = (struct ifreq *) (buffer + ifc.ifc_len);
759 for (ifr = ifc.ifc_req; ifr < end;)
760 {
761 memcpy(&addr, ifr, sizeof(addr));
762 memcpy(&mask, ifr, sizeof(mask));
763 if (ioctl(sock, SIOCGIFADDR, &addr, sizeof(addr)) == 0 &&
764 ioctl(sock, SIOCGIFNETMASK, &mask, sizeof(mask)) == 0)
765 run_ifaddr_callback(callback, cb_data,
766 &addr.ifr_addr, &mask.ifr_addr);
767 ifr = (struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr));
768 }
769
770 free(buffer);
771 close(sock);
772 return 0;
773 }
774 #else /* !defined(SIOCGIFCONF) */
775
776 /*
777 * Enumerate the system's network interface addresses and call the callback
778 * for each one. Returns 0 if successful, -1 if trouble.
779 *
780 * This version is our fallback if there's no known way to get the
781 * interface addresses. Just return the standard loopback addresses.
782 */
783 int
pg_foreach_ifaddr(PgIfAddrCallback callback,void * cb_data)784 pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
785 {
786 struct sockaddr_in addr;
787 struct sockaddr_storage mask;
788
789 #ifdef HAVE_IPV6
790 struct sockaddr_in6 addr6;
791 #endif
792
793 /* addr 127.0.0.1/8 */
794 memset(&addr, 0, sizeof(addr));
795 addr.sin_family = AF_INET;
796 addr.sin_addr.s_addr = ntohl(0x7f000001);
797 memset(&mask, 0, sizeof(mask));
798 pg_sockaddr_cidr_mask(&mask, "8", AF_INET);
799 run_ifaddr_callback(callback, cb_data,
800 (struct sockaddr *) & addr,
801 (struct sockaddr *) & mask);
802
803 #ifdef HAVE_IPV6
804 /* addr ::1/128 */
805 memset(&addr6, 0, sizeof(addr6));
806 addr6.sin6_family = AF_INET6;
807 addr6.sin6_addr.s6_addr[15] = 1;
808 memset(&mask, 0, sizeof(mask));
809 pg_sockaddr_cidr_mask(&mask, "128", AF_INET6);
810 run_ifaddr_callback(callback, cb_data,
811 (struct sockaddr *) & addr6,
812 (struct sockaddr *) & mask);
813 #endif
814
815 return 0;
816 }
817 #endif /* !defined(SIOCGIFCONF) */
818
819 #endif /* !HAVE_GETIFADDRS */
820