Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * ifaddr.c
4 : * IP netmask calculations, and enumerating network interfaces.
5 : *
6 : * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/libpq/ifaddr.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 : #include "postgres.h"
21 :
22 : #include <unistd.h>
23 : #include <sys/stat.h>
24 : #include <sys/socket.h>
25 : #include <netdb.h>
26 : #include <netinet/in.h>
27 : #include <netinet/tcp.h>
28 : #include <sys/file.h>
29 :
30 : #include "libpq/ifaddr.h"
31 : #include "port/pg_bswap.h"
32 :
33 : static int range_sockaddr_AF_INET(const struct sockaddr_in *addr,
34 : const struct sockaddr_in *netaddr,
35 : const struct sockaddr_in *netmask);
36 :
37 : static int range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr,
38 : const struct sockaddr_in6 *netaddr,
39 : const struct sockaddr_in6 *netmask);
40 :
41 :
42 : /*
43 : * pg_range_sockaddr - is addr within the subnet specified by netaddr/netmask ?
44 : *
45 : * Note: caller must already have verified that all three addresses are
46 : * in the same address family; and AF_UNIX addresses are not supported.
47 : */
48 : int
49 934 : pg_range_sockaddr(const struct sockaddr_storage *addr,
50 : const struct sockaddr_storage *netaddr,
51 : const struct sockaddr_storage *netmask)
52 : {
53 934 : if (addr->ss_family == AF_INET)
54 648 : return range_sockaddr_AF_INET((const struct sockaddr_in *) addr,
55 : (const struct sockaddr_in *) netaddr,
56 : (const struct sockaddr_in *) netmask);
57 286 : else if (addr->ss_family == AF_INET6)
58 286 : return range_sockaddr_AF_INET6((const struct sockaddr_in6 *) addr,
59 : (const struct sockaddr_in6 *) netaddr,
60 : (const struct sockaddr_in6 *) netmask);
61 : else
62 0 : return 0;
63 : }
64 :
65 : static int
66 648 : range_sockaddr_AF_INET(const struct sockaddr_in *addr,
67 : const struct sockaddr_in *netaddr,
68 : const struct sockaddr_in *netmask)
69 : {
70 648 : if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) &
71 648 : netmask->sin_addr.s_addr) == 0)
72 648 : return 1;
73 : else
74 0 : return 0;
75 : }
76 :
77 : static int
78 286 : range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr,
79 : const struct sockaddr_in6 *netaddr,
80 : const struct sockaddr_in6 *netmask)
81 : {
82 : int i;
83 :
84 4862 : for (i = 0; i < 16; i++)
85 : {
86 4576 : if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) &
87 4576 : netmask->sin6_addr.s6_addr[i]) != 0)
88 0 : return 0;
89 : }
90 :
91 286 : return 1;
92 : }
93 :
94 : /*
95 : * pg_sockaddr_cidr_mask - make a network mask of the appropriate family
96 : * and required number of significant bits
97 : *
98 : * numbits can be null, in which case the mask is fully set.
99 : *
100 : * The resulting mask is placed in *mask, which had better be big enough.
101 : *
102 : * Return value is 0 if okay, -1 if not.
103 : */
104 : int
105 6826 : pg_sockaddr_cidr_mask(struct sockaddr_storage *mask, char *numbits, int family)
106 : {
107 : long bits;
108 : char *endptr;
109 :
110 6826 : if (numbits == NULL)
111 : {
112 0 : bits = (family == AF_INET) ? 32 : 128;
113 : }
114 : else
115 : {
116 6826 : bits = strtol(numbits, &endptr, 10);
117 6826 : if (*numbits == '\0' || *endptr != '\0')
118 0 : return -1;
119 : }
120 :
121 6826 : switch (family)
122 : {
123 3626 : case AF_INET:
124 : {
125 : struct sockaddr_in mask4;
126 : long maskl;
127 :
128 3626 : if (bits < 0 || bits > 32)
129 0 : return -1;
130 3626 : memset(&mask4, 0, sizeof(mask4));
131 : /* avoid "x << 32", which is not portable */
132 3626 : if (bits > 0)
133 3626 : maskl = (0xffffffffUL << (32 - (int) bits))
134 3626 : & 0xffffffffUL;
135 : else
136 0 : maskl = 0;
137 3626 : mask4.sin_addr.s_addr = pg_hton32(maskl);
138 3626 : memcpy(mask, &mask4, sizeof(mask4));
139 3626 : break;
140 : }
141 :
142 3200 : case AF_INET6:
143 : {
144 : struct sockaddr_in6 mask6;
145 : int i;
146 :
147 3200 : if (bits < 0 || bits > 128)
148 0 : return -1;
149 3200 : memset(&mask6, 0, sizeof(mask6));
150 54400 : for (i = 0; i < 16; i++)
151 : {
152 51200 : if (bits <= 0)
153 0 : mask6.sin6_addr.s6_addr[i] = 0;
154 51200 : else if (bits >= 8)
155 51200 : mask6.sin6_addr.s6_addr[i] = 0xff;
156 : else
157 : {
158 0 : mask6.sin6_addr.s6_addr[i] =
159 0 : (0xff << (8 - (int) bits)) & 0xff;
160 : }
161 51200 : bits -= 8;
162 : }
163 3200 : memcpy(mask, &mask6, sizeof(mask6));
164 3200 : break;
165 : }
166 :
167 0 : default:
168 0 : return -1;
169 : }
170 :
171 6826 : mask->ss_family = family;
172 6826 : return 0;
173 : }
174 :
175 :
176 : /*
177 : * Run the callback function for the addr/mask, after making sure the
178 : * mask is sane for the addr.
179 : */
180 : static void
181 0 : run_ifaddr_callback(PgIfAddrCallback callback, void *cb_data,
182 : struct sockaddr *addr, struct sockaddr *mask)
183 : {
184 : struct sockaddr_storage fullmask;
185 :
186 0 : if (!addr)
187 0 : return;
188 :
189 : /* Check that the mask is valid */
190 0 : if (mask)
191 : {
192 0 : if (mask->sa_family != addr->sa_family)
193 : {
194 0 : mask = NULL;
195 : }
196 0 : else if (mask->sa_family == AF_INET)
197 : {
198 0 : if (((struct sockaddr_in *) mask)->sin_addr.s_addr == INADDR_ANY)
199 0 : mask = NULL;
200 : }
201 0 : else if (mask->sa_family == AF_INET6)
202 : {
203 0 : if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) mask)->sin6_addr))
204 0 : mask = NULL;
205 : }
206 : }
207 :
208 : /* If mask is invalid, generate our own fully-set mask */
209 0 : if (!mask)
210 : {
211 0 : pg_sockaddr_cidr_mask(&fullmask, NULL, addr->sa_family);
212 0 : mask = (struct sockaddr *) &fullmask;
213 : }
214 :
215 0 : (*callback) (addr, mask, cb_data);
216 : }
217 :
218 : #ifdef WIN32
219 :
220 : #include <winsock2.h>
221 : #include <ws2tcpip.h>
222 :
223 : /*
224 : * Enumerate the system's network interface addresses and call the callback
225 : * for each one. Returns 0 if successful, -1 if trouble.
226 : *
227 : * This version is for Win32. Uses the Winsock 2 functions (ie: ws2_32.dll)
228 : */
229 : int
230 : pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
231 : {
232 : INTERFACE_INFO *ptr,
233 : *ii = NULL;
234 : unsigned long length,
235 : i;
236 : unsigned long n_ii = 0;
237 : SOCKET sock;
238 : int error;
239 :
240 : sock = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
241 : if (sock == INVALID_SOCKET)
242 : return -1;
243 :
244 : while (n_ii < 1024)
245 : {
246 : n_ii += 64;
247 : ptr = realloc(ii, sizeof(INTERFACE_INFO) * n_ii);
248 : if (!ptr)
249 : {
250 : free(ii);
251 : closesocket(sock);
252 : errno = ENOMEM;
253 : return -1;
254 : }
255 :
256 : ii = ptr;
257 : if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, 0, 0,
258 : ii, n_ii * sizeof(INTERFACE_INFO),
259 : &length, 0, 0) == SOCKET_ERROR)
260 : {
261 : error = WSAGetLastError();
262 : if (error == WSAEFAULT || error == WSAENOBUFS)
263 : continue; /* need to make the buffer bigger */
264 : closesocket(sock);
265 : free(ii);
266 : return -1;
267 : }
268 :
269 : break;
270 : }
271 :
272 : for (i = 0; i < length / sizeof(INTERFACE_INFO); ++i)
273 : run_ifaddr_callback(callback, cb_data,
274 : (struct sockaddr *) &ii[i].iiAddress,
275 : (struct sockaddr *) &ii[i].iiNetmask);
276 :
277 : closesocket(sock);
278 : free(ii);
279 : return 0;
280 : }
281 : #elif HAVE_GETIFADDRS /* && !WIN32 */
282 :
283 : #ifdef HAVE_IFADDRS_H
284 : #include <ifaddrs.h>
285 : #endif
286 :
287 : /*
288 : * Enumerate the system's network interface addresses and call the callback
289 : * for each one. Returns 0 if successful, -1 if trouble.
290 : *
291 : * This version uses the getifaddrs() interface, which is available on
292 : * BSDs, macOS, Solaris, illumos and Linux.
293 : */
294 : int
295 0 : pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
296 : {
297 : struct ifaddrs *ifa,
298 : *l;
299 :
300 0 : if (getifaddrs(&ifa) < 0)
301 0 : return -1;
302 :
303 0 : for (l = ifa; l; l = l->ifa_next)
304 0 : run_ifaddr_callback(callback, cb_data,
305 : l->ifa_addr, l->ifa_netmask);
306 :
307 0 : freeifaddrs(ifa);
308 0 : return 0;
309 : }
310 : #else /* !HAVE_GETIFADDRS && !WIN32 */
311 :
312 : #include <sys/ioctl.h>
313 : #include <net/if.h>
314 :
315 : #if defined(SIOCGIFCONF)
316 :
317 : /*
318 : * Remaining Unixes use SIOCGIFCONF. Some only return IPv4 information
319 : * here, so this is the least preferred method. Note that there is no
320 : * standard way to iterate the struct ifreq returned in the array.
321 : * On some OSs the structures are padded large enough for any address,
322 : * on others you have to calculate the size of the struct ifreq.
323 : */
324 :
325 : /* Some OSs have _SIZEOF_ADDR_IFREQ, so just use that */
326 : #ifndef _SIZEOF_ADDR_IFREQ
327 :
328 : /* Calculate based on sockaddr.sa_len */
329 : #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
330 : #define _SIZEOF_ADDR_IFREQ(ifr) \
331 : ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
332 : (sizeof(struct ifreq) - sizeof(struct sockaddr) + \
333 : (ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
334 :
335 : /* Padded ifreq structure, simple */
336 : #else
337 : #define _SIZEOF_ADDR_IFREQ(ifr) \
338 : sizeof (struct ifreq)
339 : #endif
340 : #endif /* !_SIZEOF_ADDR_IFREQ */
341 :
342 : /*
343 : * Enumerate the system's network interface addresses and call the callback
344 : * for each one. Returns 0 if successful, -1 if trouble.
345 : *
346 : * This version uses ioctl(SIOCGIFCONF).
347 : */
348 : int
349 : pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
350 : {
351 : struct ifconf ifc;
352 : struct ifreq *ifr,
353 : *end,
354 : addr,
355 : mask;
356 : char *ptr,
357 : *buffer = NULL;
358 : size_t n_buffer = 1024;
359 : pgsocket sock;
360 :
361 : sock = socket(AF_INET, SOCK_DGRAM, 0);
362 : if (sock == PGINVALID_SOCKET)
363 : return -1;
364 :
365 : while (n_buffer < 1024 * 100)
366 : {
367 : n_buffer += 1024;
368 : ptr = realloc(buffer, n_buffer);
369 : if (!ptr)
370 : {
371 : free(buffer);
372 : close(sock);
373 : errno = ENOMEM;
374 : return -1;
375 : }
376 :
377 : memset(&ifc, 0, sizeof(ifc));
378 : ifc.ifc_buf = buffer = ptr;
379 : ifc.ifc_len = n_buffer;
380 :
381 : if (ioctl(sock, SIOCGIFCONF, &ifc) < 0)
382 : {
383 : if (errno == EINVAL)
384 : continue;
385 : free(buffer);
386 : close(sock);
387 : return -1;
388 : }
389 :
390 : /*
391 : * Some Unixes try to return as much data as possible, with no
392 : * indication of whether enough space allocated. Don't believe we have
393 : * it all unless there's lots of slop.
394 : */
395 : if (ifc.ifc_len < n_buffer - 1024)
396 : break;
397 : }
398 :
399 : end = (struct ifreq *) (buffer + ifc.ifc_len);
400 : for (ifr = ifc.ifc_req; ifr < end;)
401 : {
402 : memcpy(&addr, ifr, sizeof(addr));
403 : memcpy(&mask, ifr, sizeof(mask));
404 : if (ioctl(sock, SIOCGIFADDR, &addr, sizeof(addr)) == 0 &&
405 : ioctl(sock, SIOCGIFNETMASK, &mask, sizeof(mask)) == 0)
406 : run_ifaddr_callback(callback, cb_data,
407 : &addr.ifr_addr, &mask.ifr_addr);
408 : ifr = (struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr));
409 : }
410 :
411 : free(buffer);
412 : close(sock);
413 : return 0;
414 : }
415 : #else /* !defined(SIOCGIFCONF) */
416 :
417 : /*
418 : * Enumerate the system's network interface addresses and call the callback
419 : * for each one. Returns 0 if successful, -1 if trouble.
420 : *
421 : * This version is our fallback if there's no known way to get the
422 : * interface addresses. Just return the standard loopback addresses.
423 : */
424 : int
425 : pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
426 : {
427 : struct sockaddr_in addr;
428 : struct sockaddr_storage mask;
429 : struct sockaddr_in6 addr6;
430 :
431 : /* addr 127.0.0.1/8 */
432 : memset(&addr, 0, sizeof(addr));
433 : addr.sin_family = AF_INET;
434 : addr.sin_addr.s_addr = pg_ntoh32(0x7f000001);
435 : memset(&mask, 0, sizeof(mask));
436 : pg_sockaddr_cidr_mask(&mask, "8", AF_INET);
437 : run_ifaddr_callback(callback, cb_data,
438 : (struct sockaddr *) &addr,
439 : (struct sockaddr *) &mask);
440 :
441 : /* addr ::1/128 */
442 : memset(&addr6, 0, sizeof(addr6));
443 : addr6.sin6_family = AF_INET6;
444 : addr6.sin6_addr.s6_addr[15] = 1;
445 : memset(&mask, 0, sizeof(mask));
446 : pg_sockaddr_cidr_mask(&mask, "128", AF_INET6);
447 : run_ifaddr_callback(callback, cb_data,
448 : (struct sockaddr *) &addr6,
449 : (struct sockaddr *) &mask);
450 :
451 : return 0;
452 : }
453 : #endif /* !defined(SIOCGIFCONF) */
454 :
455 : #endif /* !HAVE_GETIFADDRS */
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