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Commit | Line | Data |
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a7334b09 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
a7334b09 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
42f4e3c4 | 20 | #include <arpa/inet.h> |
07630cea | 21 | #include <errno.h> |
11c3a366 | 22 | #include <limits.h> |
542563ba | 23 | #include <net/if.h> |
b31f535c | 24 | #include <netdb.h> |
2583fbea | 25 | #include <netinet/ip.h> |
60d9771c | 26 | #include <poll.h> |
07630cea | 27 | #include <stddef.h> |
11c3a366 | 28 | #include <stdint.h> |
07630cea | 29 | #include <stdio.h> |
11c3a366 | 30 | #include <stdlib.h> |
07630cea | 31 | #include <string.h> |
07630cea | 32 | #include <unistd.h> |
42f4e3c4 | 33 | |
b5efdb8a | 34 | #include "alloc-util.h" |
2583fbea | 35 | #include "fd-util.h" |
07630cea | 36 | #include "fileio.h" |
f97b34a6 | 37 | #include "format-util.h" |
93cc7779 | 38 | #include "log.h" |
42f4e3c4 | 39 | #include "macro.h" |
07630cea | 40 | #include "missing.h" |
6bedfcbb | 41 | #include "parse-util.h" |
9eb977db | 42 | #include "path-util.h" |
2583fbea | 43 | #include "socket-util.h" |
8b43440b | 44 | #include "string-table.h" |
07630cea | 45 | #include "string-util.h" |
ef76dff2 | 46 | #include "strv.h" |
ee104e11 | 47 | #include "user-util.h" |
ef76dff2 | 48 | #include "utf8.h" |
2eec67ac | 49 | #include "util.h" |
42f4e3c4 | 50 | |
6326a143 WB |
51 | #ifdef ENABLE_IDN |
52 | # define IDN_FLAGS (NI_IDN|NI_IDN_USE_STD3_ASCII_RULES) | |
53 | #else | |
54 | # define IDN_FLAGS 0 | |
55 | #endif | |
56 | ||
542563ba | 57 | int socket_address_parse(SocketAddress *a, const char *s) { |
42f4e3c4 LP |
58 | char *e, *n; |
59 | unsigned u; | |
4d49b48c | 60 | int r; |
42f4e3c4 LP |
61 | |
62 | assert(a); | |
63 | assert(s); | |
64 | ||
9152c765 | 65 | zero(*a); |
542563ba | 66 | a->type = SOCK_STREAM; |
42f4e3c4 LP |
67 | |
68 | if (*s == '[') { | |
69 | /* IPv6 in [x:.....:z]:p notation */ | |
70 | ||
4d49b48c LP |
71 | e = strchr(s+1, ']'); |
72 | if (!e) | |
42f4e3c4 LP |
73 | return -EINVAL; |
74 | ||
4d49b48c | 75 | n = strndupa(s+1, e-s-1); |
42f4e3c4 LP |
76 | |
77 | errno = 0; | |
4d49b48c | 78 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
8333c77e | 79 | return errno > 0 ? -errno : -EINVAL; |
42f4e3c4 LP |
80 | |
81 | e++; | |
82 | if (*e != ':') | |
83 | return -EINVAL; | |
84 | ||
85 | e++; | |
4d49b48c LP |
86 | r = safe_atou(e, &u); |
87 | if (r < 0) | |
42f4e3c4 LP |
88 | return r; |
89 | ||
90 | if (u <= 0 || u > 0xFFFF) | |
91 | return -EINVAL; | |
92 | ||
93 | a->sockaddr.in6.sin6_family = AF_INET6; | |
8e38570e | 94 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
42f4e3c4 | 95 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
96 | |
97 | } else if (*s == '/') { | |
98 | /* AF_UNIX socket */ | |
99 | ||
100 | size_t l; | |
101 | ||
102 | l = strlen(s); | |
103 | if (l >= sizeof(a->sockaddr.un.sun_path)) | |
104 | return -EINVAL; | |
105 | ||
106 | a->sockaddr.un.sun_family = AF_UNIX; | |
107 | memcpy(a->sockaddr.un.sun_path, s, l); | |
0e098b15 | 108 | a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
42f4e3c4 | 109 | |
1c24e7bd | 110 | } else if (*s == '@') { |
42f4e3c4 LP |
111 | /* Abstract AF_UNIX socket */ |
112 | size_t l; | |
113 | ||
114 | l = strlen(s+1); | |
115 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) | |
116 | return -EINVAL; | |
117 | ||
118 | a->sockaddr.un.sun_family = AF_UNIX; | |
119 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 120 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 121 | |
0fc0f14b SH |
122 | } else if (startswith(s, "vsock:")) { |
123 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
124 | const char *cid_start = s + strlen("vsock:"); | |
125 | ||
126 | e = strchr(cid_start, ':'); | |
127 | if (!e) | |
128 | return -EINVAL; | |
129 | ||
130 | r = safe_atou(e+1, &u); | |
131 | if (r < 0) | |
132 | return r; | |
133 | ||
134 | n = strndupa(cid_start, e - cid_start); | |
135 | if (!isempty(n)) { | |
136 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
137 | if (r < 0) | |
138 | return r; | |
139 | } else | |
140 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
141 | ||
142 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
143 | a->sockaddr.vm.svm_port = u; | |
144 | a->size = sizeof(struct sockaddr_vm); | |
145 | ||
42f4e3c4 | 146 | } else { |
4d49b48c LP |
147 | e = strchr(s, ':'); |
148 | if (e) { | |
149 | r = safe_atou(e+1, &u); | |
150 | if (r < 0) | |
542563ba LP |
151 | return r; |
152 | ||
153 | if (u <= 0 || u > 0xFFFF) | |
154 | return -EINVAL; | |
42f4e3c4 | 155 | |
4d49b48c | 156 | n = strndupa(s, e-s); |
42f4e3c4 | 157 | |
542563ba | 158 | /* IPv4 in w.x.y.z:p notation? */ |
4d49b48c LP |
159 | r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
160 | if (r < 0) | |
542563ba | 161 | return -errno; |
42f4e3c4 | 162 | |
542563ba LP |
163 | if (r > 0) { |
164 | /* Gotcha, it's a traditional IPv4 address */ | |
4d49b48c | 165 | a->sockaddr.in.sin_family = AF_INET; |
8e38570e | 166 | a->sockaddr.in.sin_port = htobe16((uint16_t)u); |
542563ba LP |
167 | a->size = sizeof(struct sockaddr_in); |
168 | } else { | |
169 | unsigned idx; | |
42f4e3c4 | 170 | |
4d49b48c | 171 | if (strlen(n) > IF_NAMESIZE-1) |
acbb0225 | 172 | return -EINVAL; |
acbb0225 | 173 | |
542563ba LP |
174 | /* Uh, our last resort, an interface name */ |
175 | idx = if_nametoindex(n); | |
83c60c9f | 176 | if (idx == 0) |
542563ba | 177 | return -EINVAL; |
42f4e3c4 | 178 | |
542563ba | 179 | a->sockaddr.in6.sin6_family = AF_INET6; |
8e38570e | 180 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
542563ba | 181 | a->sockaddr.in6.sin6_scope_id = idx; |
83c60c9f | 182 | a->sockaddr.in6.sin6_addr = in6addr_any; |
542563ba LP |
183 | a->size = sizeof(struct sockaddr_in6); |
184 | } | |
42f4e3c4 LP |
185 | } else { |
186 | ||
187 | /* Just a port */ | |
5198dabc LP |
188 | r = safe_atou(s, &u); |
189 | if (r < 0) | |
42f4e3c4 LP |
190 | return r; |
191 | ||
192 | if (u <= 0 || u > 0xFFFF) | |
193 | return -EINVAL; | |
194 | ||
5bfcc1c6 FF |
195 | if (socket_ipv6_is_supported()) { |
196 | a->sockaddr.in6.sin6_family = AF_INET6; | |
8e38570e | 197 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
5bfcc1c6 FF |
198 | a->sockaddr.in6.sin6_addr = in6addr_any; |
199 | a->size = sizeof(struct sockaddr_in6); | |
200 | } else { | |
4d49b48c | 201 | a->sockaddr.in.sin_family = AF_INET; |
8e38570e | 202 | a->sockaddr.in.sin_port = htobe16((uint16_t)u); |
4d49b48c | 203 | a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
5bfcc1c6 FF |
204 | a->size = sizeof(struct sockaddr_in); |
205 | } | |
42f4e3c4 LP |
206 | } |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
7693146d LP |
212 | int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
213 | SocketAddress b; | |
214 | int r; | |
215 | ||
216 | /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ | |
217 | ||
218 | r = socket_address_parse(&b, s); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { | |
223 | log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); | |
224 | return -EAFNOSUPPORT; | |
225 | } | |
226 | ||
227 | *a = b; | |
228 | return 0; | |
229 | } | |
230 | ||
7a22745a LP |
231 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
232 | int family; | |
233 | unsigned group = 0; | |
f8b69d1d | 234 | _cleanup_free_ char *sfamily = NULL; |
7a22745a LP |
235 | assert(a); |
236 | assert(s); | |
237 | ||
238 | zero(*a); | |
239 | a->type = SOCK_RAW; | |
240 | ||
241 | errno = 0; | |
242 | if (sscanf(s, "%ms %u", &sfamily, &group) < 1) | |
bcb161b0 | 243 | return errno > 0 ? -errno : -EINVAL; |
7a22745a | 244 | |
f8b69d1d MS |
245 | family = netlink_family_from_string(sfamily); |
246 | if (family < 0) | |
247 | return -EINVAL; | |
7a22745a LP |
248 | |
249 | a->sockaddr.nl.nl_family = AF_NETLINK; | |
250 | a->sockaddr.nl.nl_groups = group; | |
251 | ||
252 | a->type = SOCK_RAW; | |
253 | a->size = sizeof(struct sockaddr_nl); | |
254 | a->protocol = family; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
542563ba | 259 | int socket_address_verify(const SocketAddress *a) { |
42f4e3c4 LP |
260 | assert(a); |
261 | ||
542563ba | 262 | switch (socket_address_family(a)) { |
42f4e3c4 | 263 | |
7a22745a LP |
264 | case AF_INET: |
265 | if (a->size != sizeof(struct sockaddr_in)) | |
266 | return -EINVAL; | |
42f4e3c4 | 267 | |
4d49b48c | 268 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 269 | return -EINVAL; |
42f4e3c4 | 270 | |
ec2ce0c5 | 271 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 272 | return -EINVAL; |
42f4e3c4 | 273 | |
7a22745a LP |
274 | return 0; |
275 | ||
276 | case AF_INET6: | |
277 | if (a->size != sizeof(struct sockaddr_in6)) | |
278 | return -EINVAL; | |
42f4e3c4 | 279 | |
7a22745a LP |
280 | if (a->sockaddr.in6.sin6_port == 0) |
281 | return -EINVAL; | |
42f4e3c4 | 282 | |
ec2ce0c5 | 283 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 284 | return -EINVAL; |
42f4e3c4 | 285 | |
7a22745a | 286 | return 0; |
42f4e3c4 | 287 | |
7a22745a LP |
288 | case AF_UNIX: |
289 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
290 | return -EINVAL; | |
42f4e3c4 | 291 | |
7a22745a | 292 | if (a->size > offsetof(struct sockaddr_un, sun_path)) { |
42f4e3c4 | 293 | |
7a22745a LP |
294 | if (a->sockaddr.un.sun_path[0] != 0) { |
295 | char *e; | |
296 | ||
297 | /* path */ | |
4d49b48c LP |
298 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
299 | if (!e) | |
7a22745a LP |
300 | return -EINVAL; |
301 | ||
302 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) | |
303 | return -EINVAL; | |
42f4e3c4 | 304 | } |
7a22745a | 305 | } |
42f4e3c4 | 306 | |
ec2ce0c5 | 307 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 308 | return -EINVAL; |
42f4e3c4 | 309 | |
7a22745a LP |
310 | return 0; |
311 | ||
312 | case AF_NETLINK: | |
313 | ||
314 | if (a->size != sizeof(struct sockaddr_nl)) | |
315 | return -EINVAL; | |
316 | ||
ec2ce0c5 | 317 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
318 | return -EINVAL; |
319 | ||
320 | return 0; | |
321 | ||
0fc0f14b SH |
322 | case AF_VSOCK: |
323 | if (a->size != sizeof(struct sockaddr_vm)) | |
324 | return -EINVAL; | |
325 | ||
ec2ce0c5 | 326 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
327 | return -EINVAL; |
328 | ||
329 | return 0; | |
330 | ||
7a22745a LP |
331 | default: |
332 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
333 | } |
334 | } | |
335 | ||
4d49b48c | 336 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 337 | int r; |
4d49b48c | 338 | |
42f4e3c4 | 339 | assert(a); |
4d49b48c | 340 | assert(ret); |
42f4e3c4 | 341 | |
4d49b48c LP |
342 | r = socket_address_verify(a); |
343 | if (r < 0) | |
42f4e3c4 LP |
344 | return r; |
345 | ||
4d49b48c | 346 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 347 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 348 | |
f8b69d1d | 349 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 350 | if (r < 0) |
f8b69d1d | 351 | return r; |
4d49b48c LP |
352 | |
353 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
354 | if (r < 0) |
355 | return -ENOMEM; | |
7a22745a LP |
356 | |
357 | return 0; | |
358 | } | |
359 | ||
3b1c5241 | 360 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
361 | } |
362 | ||
4f2d528d LP |
363 | bool socket_address_can_accept(const SocketAddress *a) { |
364 | assert(a); | |
365 | ||
366 | return | |
3742095b | 367 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 368 | } |
a16e1123 LP |
369 | |
370 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
371 | assert(a); | |
372 | assert(b); | |
373 | ||
374 | /* Invalid addresses are unequal to all */ | |
375 | if (socket_address_verify(a) < 0 || | |
376 | socket_address_verify(b) < 0) | |
377 | return false; | |
378 | ||
379 | if (a->type != b->type) | |
380 | return false; | |
381 | ||
a16e1123 LP |
382 | if (socket_address_family(a) != socket_address_family(b)) |
383 | return false; | |
384 | ||
385 | switch (socket_address_family(a)) { | |
386 | ||
387 | case AF_INET: | |
4d49b48c | 388 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
389 | return false; |
390 | ||
4d49b48c | 391 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
392 | return false; |
393 | ||
394 | break; | |
395 | ||
396 | case AF_INET6: | |
397 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
398 | return false; | |
399 | ||
400 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
401 | return false; | |
402 | ||
403 | break; | |
404 | ||
405 | case AF_UNIX: | |
710708a5 MS |
406 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
407 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
408 | return false; | |
409 | ||
a16e1123 LP |
410 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
411 | return false; | |
412 | ||
413 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 414 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
415 | return false; |
416 | } else { | |
c78e47a6 MS |
417 | if (a->size != b->size) |
418 | return false; | |
419 | ||
b12c1e7c | 420 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
421 | return false; |
422 | } | |
423 | ||
424 | break; | |
425 | ||
7a22745a | 426 | case AF_NETLINK: |
7a22745a LP |
427 | if (a->protocol != b->protocol) |
428 | return false; | |
429 | ||
430 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
431 | return false; | |
432 | ||
433 | break; | |
434 | ||
0fc0f14b SH |
435 | case AF_VSOCK: |
436 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
437 | return false; | |
438 | ||
439 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
440 | return false; | |
441 | ||
442 | break; | |
443 | ||
a16e1123 LP |
444 | default: |
445 | /* Cannot compare, so we assume the addresses are different */ | |
446 | return false; | |
447 | } | |
448 | ||
449 | return true; | |
450 | } | |
451 | ||
27ca8d7a | 452 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
453 | struct SocketAddress b; |
454 | ||
455 | assert(a); | |
456 | assert(s); | |
457 | ||
458 | if (socket_address_parse(&b, s) < 0) | |
459 | return false; | |
460 | ||
27ca8d7a LP |
461 | b.type = type; |
462 | ||
a16e1123 | 463 | return socket_address_equal(a, &b); |
6e2ef85b LP |
464 | } |
465 | ||
7a22745a LP |
466 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
467 | struct SocketAddress b; | |
468 | ||
469 | assert(a); | |
470 | assert(s); | |
471 | ||
472 | if (socket_address_parse_netlink(&b, s) < 0) | |
473 | return false; | |
474 | ||
475 | return socket_address_equal(a, &b); | |
476 | } | |
477 | ||
a57f7e2c | 478 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
479 | assert(a); |
480 | ||
481 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 482 | return NULL; |
6e2ef85b LP |
483 | |
484 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 485 | return NULL; |
a16e1123 | 486 | |
a57f7e2c | 487 | return a->sockaddr.un.sun_path; |
a16e1123 | 488 | } |
c0120d99 | 489 | |
5bfcc1c6 | 490 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 491 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 492 | return false; |
f89f1e8f | 493 | |
7377964d | 494 | return true; |
5bfcc1c6 FF |
495 | } |
496 | ||
01e10de3 | 497 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
498 | SocketAddress b; |
499 | socklen_t solen; | |
01e10de3 LP |
500 | |
501 | assert(a); | |
502 | assert(fd >= 0); | |
503 | ||
dbafedac MS |
504 | b.size = sizeof(b.sockaddr); |
505 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
506 | return false; |
507 | ||
dbafedac | 508 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
509 | return false; |
510 | ||
dbafedac MS |
511 | solen = sizeof(b.type); |
512 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
513 | return false; |
514 | ||
dbafedac | 515 | if (b.type != a->type) |
01e10de3 LP |
516 | return false; |
517 | ||
518 | if (a->protocol != 0) { | |
dbafedac MS |
519 | solen = sizeof(b.protocol); |
520 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
521 | return false; |
522 | ||
dbafedac | 523 | if (b.protocol != a->protocol) |
01e10de3 LP |
524 | return false; |
525 | } | |
526 | ||
02233928 | 527 | return socket_address_equal(a, &b); |
01e10de3 LP |
528 | } |
529 | ||
882ac6e7 | 530 | int sockaddr_port(const struct sockaddr *_sa, unsigned *port) { |
3b1c5241 SL |
531 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
532 | ||
533 | assert(sa); | |
534 | ||
0fc0f14b SH |
535 | switch (sa->sa.sa_family) { |
536 | case AF_INET: | |
537 | *port = be16toh(sa->in.sin_port); | |
538 | return 0; | |
3b1c5241 | 539 | |
0fc0f14b SH |
540 | case AF_INET6: |
541 | *port = be16toh(sa->in6.sin6_port); | |
542 | return 0; | |
543 | ||
544 | case AF_VSOCK: | |
545 | *port = sa->vm.svm_port; | |
546 | return 0; | |
547 | ||
548 | default: | |
549 | return -EAFNOSUPPORT; | |
550 | } | |
3b1c5241 SL |
551 | } |
552 | ||
553 | int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) { | |
4d49b48c | 554 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 555 | char *p; |
fc25ad25 | 556 | int r; |
8569a776 | 557 | |
4d49b48c LP |
558 | assert(sa); |
559 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 560 | |
4d49b48c | 561 | switch (sa->sa.sa_family) { |
8569a776 LP |
562 | |
563 | case AF_INET: { | |
564 | uint32_t a; | |
565 | ||
8e38570e | 566 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 567 | |
fc25ad25 ZJS |
568 | if (include_port) |
569 | r = asprintf(&p, | |
3b1c5241 SL |
570 | "%u.%u.%u.%u:%u", |
571 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 572 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
573 | else |
574 | r = asprintf(&p, | |
3b1c5241 | 575 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
576 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
577 | if (r < 0) | |
578 | return -ENOMEM; | |
8569a776 LP |
579 | break; |
580 | } | |
581 | ||
582 | case AF_INET6: { | |
583 | static const unsigned char ipv4_prefix[] = { | |
584 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
585 | }; | |
586 | ||
fc25ad25 ZJS |
587 | if (translate_ipv6 && |
588 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 589 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
590 | if (include_port) |
591 | r = asprintf(&p, | |
3b1c5241 SL |
592 | "%u.%u.%u.%u:%u", |
593 | a[0], a[1], a[2], a[3], | |
8e38570e | 594 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
595 | else |
596 | r = asprintf(&p, | |
3b1c5241 | 597 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
598 | a[0], a[1], a[2], a[3]); |
599 | if (r < 0) | |
600 | return -ENOMEM; | |
8569a776 LP |
601 | } else { |
602 | char a[INET6_ADDRSTRLEN]; | |
603 | ||
3b1c5241 SL |
604 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
605 | ||
606 | if (include_port) { | |
fc25ad25 | 607 | r = asprintf(&p, |
3b1c5241 SL |
608 | "[%s]:%u", |
609 | a, | |
8e38570e | 610 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 611 | if (r < 0) |
3b1c5241 SL |
612 | return -ENOMEM; |
613 | } else { | |
614 | p = strdup(a); | |
615 | if (!p) | |
616 | return -ENOMEM; | |
617 | } | |
8569a776 LP |
618 | } |
619 | ||
620 | break; | |
621 | } | |
622 | ||
4d49b48c LP |
623 | case AF_UNIX: |
624 | if (salen <= offsetof(struct sockaddr_un, sun_path)) { | |
625 | p = strdup("<unnamed>"); | |
626 | if (!p) | |
627 | return -ENOMEM; | |
8569a776 | 628 | |
4d49b48c LP |
629 | } else if (sa->un.sun_path[0] == 0) { |
630 | /* abstract */ | |
8569a776 | 631 | |
4d49b48c LP |
632 | /* FIXME: We assume we can print the |
633 | * socket path here and that it hasn't | |
634 | * more than one NUL byte. That is | |
635 | * actually an invalid assumption */ | |
636 | ||
637 | p = new(char, sizeof(sa->un.sun_path)+1); | |
638 | if (!p) | |
639 | return -ENOMEM; | |
640 | ||
641 | p[0] = '@'; | |
642 | memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1); | |
643 | p[sizeof(sa->un.sun_path)] = 0; | |
644 | ||
645 | } else { | |
646 | p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path)); | |
0810bc56 | 647 | if (!p) |
4d49b48c LP |
648 | return -ENOMEM; |
649 | } | |
8569a776 LP |
650 | |
651 | break; | |
8569a776 | 652 | |
0fc0f14b SH |
653 | case AF_VSOCK: |
654 | if (include_port) | |
655 | r = asprintf(&p, | |
656 | "vsock:%u:%u", | |
657 | sa->vm.svm_cid, | |
658 | sa->vm.svm_port); | |
659 | else | |
660 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); | |
661 | if (r < 0) | |
662 | return -ENOMEM; | |
663 | break; | |
664 | ||
8569a776 | 665 | default: |
15411c0c | 666 | return -EOPNOTSUPP; |
8569a776 LP |
667 | } |
668 | ||
4d49b48c | 669 | |
8569a776 LP |
670 | *ret = p; |
671 | return 0; | |
672 | } | |
673 | ||
366b7db4 | 674 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 675 | union sockaddr_union sa; |
b31f535c | 676 | socklen_t salen = sizeof(sa); |
eff05270 | 677 | int r; |
4d49b48c LP |
678 | |
679 | assert(fd >= 0); | |
680 | assert(ret); | |
681 | ||
4d49b48c LP |
682 | if (getpeername(fd, &sa.sa, &salen) < 0) |
683 | return -errno; | |
684 | ||
685 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 686 | struct ucred ucred = {}; |
4d49b48c LP |
687 | |
688 | /* UNIX connection sockets are anonymous, so let's use | |
689 | * PID/UID as pretty credentials instead */ | |
690 | ||
eff05270 LP |
691 | r = getpeercred(fd, &ucred); |
692 | if (r < 0) | |
693 | return r; | |
4d49b48c | 694 | |
de0671ee | 695 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
696 | return -ENOMEM; |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
702 | * if applicable, since that's nicer. */ | |
703 | ||
366b7db4 | 704 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
705 | } |
706 | ||
707 | int getsockname_pretty(int fd, char **ret) { | |
708 | union sockaddr_union sa; | |
b31f535c | 709 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
710 | |
711 | assert(fd >= 0); | |
712 | assert(ret); | |
713 | ||
4d49b48c LP |
714 | if (getsockname(fd, &sa.sa, &salen) < 0) |
715 | return -errno; | |
716 | ||
717 | /* For local sockets we do not translate IPv6 addresses back | |
718 | * to IPv6 if applicable, since this is usually used for | |
719 | * listening sockets where the difference between IPv4 and | |
720 | * IPv6 matters. */ | |
721 | ||
3b1c5241 | 722 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
723 | } |
724 | ||
b31f535c ZJS |
725 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
726 | int r; | |
727 | char host[NI_MAXHOST], *ret; | |
728 | ||
729 | assert(_ret); | |
730 | ||
6326a143 | 731 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 732 | if (r != 0) { |
b31f535c ZJS |
733 | int saved_errno = errno; |
734 | ||
3b1c5241 | 735 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 736 | if (r < 0) |
1938ac51 | 737 | return r; |
b31f535c | 738 | |
279d3c9c | 739 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
740 | } else { |
741 | ret = strdup(host); | |
742 | if (!ret) | |
1938ac51 | 743 | return -ENOMEM; |
cb651834 | 744 | } |
b31f535c ZJS |
745 | |
746 | *_ret = ret; | |
747 | return 0; | |
748 | } | |
749 | ||
750 | int getnameinfo_pretty(int fd, char **ret) { | |
751 | union sockaddr_union sa; | |
752 | socklen_t salen = sizeof(sa); | |
753 | ||
754 | assert(fd >= 0); | |
755 | assert(ret); | |
756 | ||
4a62c710 | 757 | if (getsockname(fd, &sa.sa, &salen) < 0) |
1938ac51 | 758 | return -errno; |
b31f535c ZJS |
759 | |
760 | return socknameinfo_pretty(&sa, salen, ret); | |
761 | } | |
762 | ||
bd1fe7c7 LP |
763 | int socket_address_unlink(SocketAddress *a) { |
764 | assert(a); | |
765 | ||
766 | if (socket_address_family(a) != AF_UNIX) | |
767 | return 0; | |
768 | ||
769 | if (a->sockaddr.un.sun_path[0] == 0) | |
770 | return 0; | |
771 | ||
772 | if (unlink(a->sockaddr.un.sun_path) < 0) | |
773 | return -errno; | |
774 | ||
775 | return 1; | |
776 | } | |
777 | ||
7a22745a LP |
778 | static const char* const netlink_family_table[] = { |
779 | [NETLINK_ROUTE] = "route", | |
780 | [NETLINK_FIREWALL] = "firewall", | |
781 | [NETLINK_INET_DIAG] = "inet-diag", | |
782 | [NETLINK_NFLOG] = "nflog", | |
783 | [NETLINK_XFRM] = "xfrm", | |
784 | [NETLINK_SELINUX] = "selinux", | |
785 | [NETLINK_ISCSI] = "iscsi", | |
786 | [NETLINK_AUDIT] = "audit", | |
787 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
788 | [NETLINK_CONNECTOR] = "connector", | |
789 | [NETLINK_NETFILTER] = "netfilter", | |
790 | [NETLINK_IP6_FW] = "ip6-fw", | |
791 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
792 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
793 | [NETLINK_GENERIC] = "generic", | |
794 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
795 | [NETLINK_ECRYPTFS] = "ecryptfs", |
796 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
797 | }; |
798 | ||
f8b69d1d | 799 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 800 | |
c0120d99 LP |
801 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
802 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
803 | [SOCKET_ADDRESS_BOTH] = "both", | |
804 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
805 | }; | |
806 | ||
807 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 LP |
808 | |
809 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { | |
810 | assert(a); | |
811 | assert(b); | |
812 | ||
813 | if (a->sa.sa_family != b->sa.sa_family) | |
814 | return false; | |
815 | ||
816 | if (a->sa.sa_family == AF_INET) | |
817 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
818 | ||
819 | if (a->sa.sa_family == AF_INET6) | |
820 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
821 | ||
0fc0f14b SH |
822 | if (a->sa.sa_family == AF_VSOCK) |
823 | return a->vm.svm_cid == b->vm.svm_cid; | |
824 | ||
f01e5736 LP |
825 | return false; |
826 | } | |
2583fbea LP |
827 | |
828 | int fd_inc_sndbuf(int fd, size_t n) { | |
829 | int r, value; | |
830 | socklen_t l = sizeof(value); | |
831 | ||
832 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
833 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
834 | return 0; | |
835 | ||
836 | /* If we have the privileges we will ignore the kernel limit. */ | |
837 | ||
838 | value = (int) n; | |
839 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) | |
840 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) | |
841 | return -errno; | |
842 | ||
843 | return 1; | |
844 | } | |
845 | ||
846 | int fd_inc_rcvbuf(int fd, size_t n) { | |
847 | int r, value; | |
848 | socklen_t l = sizeof(value); | |
849 | ||
850 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
851 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
852 | return 0; | |
853 | ||
854 | /* If we have the privileges we will ignore the kernel limit. */ | |
855 | ||
856 | value = (int) n; | |
857 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) | |
858 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) | |
859 | return -errno; | |
860 | return 1; | |
861 | } | |
862 | ||
863 | static const char* const ip_tos_table[] = { | |
864 | [IPTOS_LOWDELAY] = "low-delay", | |
865 | [IPTOS_THROUGHPUT] = "throughput", | |
866 | [IPTOS_RELIABILITY] = "reliability", | |
867 | [IPTOS_LOWCOST] = "low-cost", | |
868 | }; | |
869 | ||
870 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
871 | ||
ef76dff2 LP |
872 | bool ifname_valid(const char *p) { |
873 | bool numeric = true; | |
874 | ||
875 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
876 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
877 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
878 | ||
879 | if (isempty(p)) | |
880 | return false; | |
881 | ||
882 | if (strlen(p) >= IFNAMSIZ) | |
883 | return false; | |
884 | ||
49bfc877 | 885 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
886 | return false; |
887 | ||
888 | while (*p) { | |
889 | if ((unsigned char) *p >= 127U) | |
890 | return false; | |
891 | ||
892 | if ((unsigned char) *p <= 32U) | |
893 | return false; | |
894 | ||
4c701096 | 895 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
896 | return false; |
897 | ||
898 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
899 | p++; | |
900 | } | |
901 | ||
902 | if (numeric) | |
903 | return false; | |
904 | ||
905 | return true; | |
906 | } | |
907 | ||
26808948 SS |
908 | bool address_label_valid(const char *p) { |
909 | ||
910 | if (isempty(p)) | |
911 | return false; | |
912 | ||
913 | if (strlen(p) >= IFNAMSIZ) | |
914 | return false; | |
915 | ||
916 | while (*p) { | |
917 | if ((uint8_t) *p >= 127U) | |
918 | return false; | |
919 | ||
920 | if ((uint8_t) *p <= 31U) | |
921 | return false; | |
922 | p++; | |
923 | } | |
924 | ||
925 | return true; | |
926 | } | |
927 | ||
2583fbea LP |
928 | int getpeercred(int fd, struct ucred *ucred) { |
929 | socklen_t n = sizeof(struct ucred); | |
930 | struct ucred u; | |
931 | int r; | |
932 | ||
933 | assert(fd >= 0); | |
934 | assert(ucred); | |
935 | ||
936 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
937 | if (r < 0) | |
938 | return -errno; | |
939 | ||
940 | if (n != sizeof(struct ucred)) | |
941 | return -EIO; | |
942 | ||
943 | /* Check if the data is actually useful and not suppressed due | |
944 | * to namespacing issues */ | |
945 | if (u.pid <= 0) | |
946 | return -ENODATA; | |
947 | if (u.uid == UID_INVALID) | |
948 | return -ENODATA; | |
949 | if (u.gid == GID_INVALID) | |
950 | return -ENODATA; | |
951 | ||
952 | *ucred = u; | |
953 | return 0; | |
954 | } | |
955 | ||
956 | int getpeersec(int fd, char **ret) { | |
957 | socklen_t n = 64; | |
958 | char *s; | |
959 | int r; | |
960 | ||
961 | assert(fd >= 0); | |
962 | assert(ret); | |
963 | ||
964 | s = new0(char, n); | |
965 | if (!s) | |
966 | return -ENOMEM; | |
967 | ||
968 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
969 | if (r < 0) { | |
970 | free(s); | |
971 | ||
972 | if (errno != ERANGE) | |
973 | return -errno; | |
974 | ||
975 | s = new0(char, n); | |
976 | if (!s) | |
977 | return -ENOMEM; | |
978 | ||
979 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
980 | if (r < 0) { | |
981 | free(s); | |
982 | return -errno; | |
983 | } | |
984 | } | |
985 | ||
986 | if (isempty(s)) { | |
987 | free(s); | |
988 | return -EOPNOTSUPP; | |
989 | } | |
990 | ||
991 | *ret = s; | |
992 | return 0; | |
993 | } | |
994 | ||
726f4c47 ZJS |
995 | int send_one_fd_sa( |
996 | int transport_fd, | |
997 | int fd, | |
998 | const struct sockaddr *sa, socklen_t len, | |
999 | int flags) { | |
1000 | ||
2583fbea LP |
1001 | union { |
1002 | struct cmsghdr cmsghdr; | |
1003 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1004 | } control = {}; | |
1005 | struct msghdr mh = { | |
726f4c47 ZJS |
1006 | .msg_name = (struct sockaddr*) sa, |
1007 | .msg_namelen = len, | |
2583fbea LP |
1008 | .msg_control = &control, |
1009 | .msg_controllen = sizeof(control), | |
1010 | }; | |
3c171f0b | 1011 | struct cmsghdr *cmsg; |
2583fbea LP |
1012 | |
1013 | assert(transport_fd >= 0); | |
1014 | assert(fd >= 0); | |
1015 | ||
1016 | cmsg = CMSG_FIRSTHDR(&mh); | |
1017 | cmsg->cmsg_level = SOL_SOCKET; | |
1018 | cmsg->cmsg_type = SCM_RIGHTS; | |
1019 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1020 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1021 | ||
1022 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1023 | if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0) | |
1024 | return -errno; | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | int receive_one_fd(int transport_fd, int flags) { | |
1030 | union { | |
1031 | struct cmsghdr cmsghdr; | |
1032 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1033 | } control = {}; | |
1034 | struct msghdr mh = { | |
1035 | .msg_control = &control, | |
1036 | .msg_controllen = sizeof(control), | |
1037 | }; | |
1038 | struct cmsghdr *cmsg, *found = NULL; | |
1039 | ||
1040 | assert(transport_fd >= 0); | |
1041 | ||
1042 | /* | |
1043 | * Receive a single FD via @transport_fd. We don't care for | |
1044 | * the transport-type. We retrieve a single FD at most, so for | |
1045 | * packet-based transports, the caller must ensure to send | |
1046 | * only a single FD per packet. This is best used in | |
1047 | * combination with send_one_fd(). | |
1048 | */ | |
1049 | ||
1050 | if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0) | |
1051 | return -errno; | |
1052 | ||
1053 | CMSG_FOREACH(cmsg, &mh) { | |
1054 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1055 | cmsg->cmsg_type == SCM_RIGHTS && | |
1056 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1057 | assert(!found); | |
1058 | found = cmsg; | |
1059 | break; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | if (!found) { | |
1064 | cmsg_close_all(&mh); | |
1065 | return -EIO; | |
1066 | } | |
1067 | ||
1068 | return *(int*) CMSG_DATA(found); | |
1069 | } | |
4edc2c9b LP |
1070 | |
1071 | ssize_t next_datagram_size_fd(int fd) { | |
1072 | ssize_t l; | |
1073 | int k; | |
1074 | ||
1075 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1076 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1077 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1078 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1079 | * the wrong size. */ | |
1080 | ||
1081 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1082 | if (l < 0) { | |
3742095b | 1083 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1084 | goto fallback; |
1085 | ||
1086 | return -errno; | |
1087 | } | |
1088 | if (l == 0) | |
1089 | goto fallback; | |
1090 | ||
1091 | return l; | |
1092 | ||
1093 | fallback: | |
1094 | k = 0; | |
1095 | ||
1096 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1097 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1098 | ||
1099 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1100 | return -errno; | |
1101 | ||
1102 | return (ssize_t) k; | |
1103 | } | |
60d9771c LP |
1104 | |
1105 | int flush_accept(int fd) { | |
1106 | ||
1107 | struct pollfd pollfd = { | |
1108 | .fd = fd, | |
1109 | .events = POLLIN, | |
1110 | }; | |
1111 | int r; | |
1112 | ||
1113 | ||
1114 | /* Similar to flush_fd() but flushes all incoming connection by accepting them and immediately closing them. */ | |
1115 | ||
1116 | for (;;) { | |
1117 | int cfd; | |
1118 | ||
1119 | r = poll(&pollfd, 1, 0); | |
1120 | if (r < 0) { | |
1121 | if (errno == EINTR) | |
1122 | continue; | |
1123 | ||
1124 | return -errno; | |
1125 | ||
1126 | } else if (r == 0) | |
1127 | return 0; | |
1128 | ||
1129 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1130 | if (cfd < 0) { | |
1131 | if (errno == EINTR) | |
1132 | continue; | |
1133 | ||
1134 | if (errno == EAGAIN) | |
1135 | return 0; | |
1136 | ||
1137 | return -errno; | |
1138 | } | |
1139 | ||
1140 | close(cfd); | |
1141 | } | |
1142 | } | |
29206d46 LP |
1143 | |
1144 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1145 | struct cmsghdr *cmsg; | |
1146 | ||
1147 | assert(mh); | |
1148 | ||
1149 | CMSG_FOREACH(cmsg, mh) | |
1150 | if (cmsg->cmsg_level == level && | |
1151 | cmsg->cmsg_type == type && | |
1152 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1153 | return cmsg; | |
1154 | ||
1155 | return NULL; | |
1156 | } | |
429b4350 LP |
1157 | |
1158 | int socket_ioctl_fd(void) { | |
1159 | int fd; | |
1160 | ||
1161 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1162 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1163 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1164 | * generic AF_NETLINK. */ | |
1165 | ||
1166 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1167 | if (fd < 0) | |
1168 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1169 | if (fd < 0) | |
1170 | return -errno; | |
1171 | ||
1172 | return fd; | |
1173 | } |