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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7334b09 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
a7334b09 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
42f4e3c4 | 21 | #include <arpa/inet.h> |
07630cea | 22 | #include <errno.h> |
11c3a366 | 23 | #include <limits.h> |
542563ba | 24 | #include <net/if.h> |
b31f535c | 25 | #include <netdb.h> |
2583fbea | 26 | #include <netinet/ip.h> |
60d9771c | 27 | #include <poll.h> |
07630cea | 28 | #include <stddef.h> |
11c3a366 | 29 | #include <stdint.h> |
07630cea | 30 | #include <stdio.h> |
11c3a366 | 31 | #include <stdlib.h> |
07630cea | 32 | #include <string.h> |
07630cea | 33 | #include <unistd.h> |
42f4e3c4 | 34 | |
b5efdb8a | 35 | #include "alloc-util.h" |
2583fbea | 36 | #include "fd-util.h" |
07630cea | 37 | #include "fileio.h" |
f97b34a6 | 38 | #include "format-util.h" |
93cc7779 | 39 | #include "log.h" |
42f4e3c4 | 40 | #include "macro.h" |
07630cea | 41 | #include "missing.h" |
6bedfcbb | 42 | #include "parse-util.h" |
9eb977db | 43 | #include "path-util.h" |
2583fbea | 44 | #include "socket-util.h" |
8b43440b | 45 | #include "string-table.h" |
07630cea | 46 | #include "string-util.h" |
ef76dff2 | 47 | #include "strv.h" |
ee104e11 | 48 | #include "user-util.h" |
ef76dff2 | 49 | #include "utf8.h" |
2eec67ac | 50 | #include "util.h" |
42f4e3c4 | 51 | |
349cc4a5 | 52 | #if ENABLE_IDN |
6326a143 WB |
53 | # define IDN_FLAGS (NI_IDN|NI_IDN_USE_STD3_ASCII_RULES) |
54 | #else | |
55 | # define IDN_FLAGS 0 | |
56 | #endif | |
57 | ||
542563ba | 58 | int socket_address_parse(SocketAddress *a, const char *s) { |
42f4e3c4 LP |
59 | char *e, *n; |
60 | unsigned u; | |
4d49b48c | 61 | int r; |
42f4e3c4 LP |
62 | |
63 | assert(a); | |
64 | assert(s); | |
65 | ||
9152c765 | 66 | zero(*a); |
542563ba | 67 | a->type = SOCK_STREAM; |
42f4e3c4 LP |
68 | |
69 | if (*s == '[') { | |
70 | /* IPv6 in [x:.....:z]:p notation */ | |
71 | ||
4d49b48c LP |
72 | e = strchr(s+1, ']'); |
73 | if (!e) | |
42f4e3c4 LP |
74 | return -EINVAL; |
75 | ||
4d49b48c | 76 | n = strndupa(s+1, e-s-1); |
42f4e3c4 LP |
77 | |
78 | errno = 0; | |
4d49b48c | 79 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
8333c77e | 80 | return errno > 0 ? -errno : -EINVAL; |
42f4e3c4 LP |
81 | |
82 | e++; | |
83 | if (*e != ':') | |
84 | return -EINVAL; | |
85 | ||
86 | e++; | |
4d49b48c LP |
87 | r = safe_atou(e, &u); |
88 | if (r < 0) | |
42f4e3c4 LP |
89 | return r; |
90 | ||
91 | if (u <= 0 || u > 0xFFFF) | |
92 | return -EINVAL; | |
93 | ||
94 | a->sockaddr.in6.sin6_family = AF_INET6; | |
8e38570e | 95 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
42f4e3c4 | 96 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
97 | |
98 | } else if (*s == '/') { | |
99 | /* AF_UNIX socket */ | |
100 | ||
101 | size_t l; | |
102 | ||
103 | l = strlen(s); | |
104 | if (l >= sizeof(a->sockaddr.un.sun_path)) | |
105 | return -EINVAL; | |
106 | ||
107 | a->sockaddr.un.sun_family = AF_UNIX; | |
108 | memcpy(a->sockaddr.un.sun_path, s, l); | |
0e098b15 | 109 | a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
42f4e3c4 | 110 | |
1c24e7bd | 111 | } else if (*s == '@') { |
42f4e3c4 LP |
112 | /* Abstract AF_UNIX socket */ |
113 | size_t l; | |
114 | ||
115 | l = strlen(s+1); | |
116 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) | |
117 | return -EINVAL; | |
118 | ||
119 | a->sockaddr.un.sun_family = AF_UNIX; | |
120 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 121 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 122 | |
0fc0f14b SH |
123 | } else if (startswith(s, "vsock:")) { |
124 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
fbd0b64f | 125 | const char *cid_start = s + STRLEN("vsock:"); |
0fc0f14b SH |
126 | |
127 | e = strchr(cid_start, ':'); | |
128 | if (!e) | |
129 | return -EINVAL; | |
130 | ||
131 | r = safe_atou(e+1, &u); | |
132 | if (r < 0) | |
133 | return r; | |
134 | ||
135 | n = strndupa(cid_start, e - cid_start); | |
136 | if (!isempty(n)) { | |
137 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
138 | if (r < 0) | |
139 | return r; | |
140 | } else | |
141 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
142 | ||
143 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
144 | a->sockaddr.vm.svm_port = u; | |
145 | a->size = sizeof(struct sockaddr_vm); | |
146 | ||
42f4e3c4 | 147 | } else { |
4d49b48c LP |
148 | e = strchr(s, ':'); |
149 | if (e) { | |
150 | r = safe_atou(e+1, &u); | |
151 | if (r < 0) | |
542563ba LP |
152 | return r; |
153 | ||
154 | if (u <= 0 || u > 0xFFFF) | |
155 | return -EINVAL; | |
42f4e3c4 | 156 | |
4d49b48c | 157 | n = strndupa(s, e-s); |
42f4e3c4 | 158 | |
542563ba | 159 | /* IPv4 in w.x.y.z:p notation? */ |
4d49b48c LP |
160 | r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
161 | if (r < 0) | |
542563ba | 162 | return -errno; |
42f4e3c4 | 163 | |
542563ba LP |
164 | if (r > 0) { |
165 | /* Gotcha, it's a traditional IPv4 address */ | |
4d49b48c | 166 | a->sockaddr.in.sin_family = AF_INET; |
8e38570e | 167 | a->sockaddr.in.sin_port = htobe16((uint16_t)u); |
542563ba LP |
168 | a->size = sizeof(struct sockaddr_in); |
169 | } else { | |
170 | unsigned idx; | |
42f4e3c4 | 171 | |
4d49b48c | 172 | if (strlen(n) > IF_NAMESIZE-1) |
acbb0225 | 173 | return -EINVAL; |
acbb0225 | 174 | |
542563ba LP |
175 | /* Uh, our last resort, an interface name */ |
176 | idx = if_nametoindex(n); | |
83c60c9f | 177 | if (idx == 0) |
542563ba | 178 | return -EINVAL; |
42f4e3c4 | 179 | |
542563ba | 180 | a->sockaddr.in6.sin6_family = AF_INET6; |
8e38570e | 181 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
542563ba | 182 | a->sockaddr.in6.sin6_scope_id = idx; |
83c60c9f | 183 | a->sockaddr.in6.sin6_addr = in6addr_any; |
542563ba LP |
184 | a->size = sizeof(struct sockaddr_in6); |
185 | } | |
42f4e3c4 LP |
186 | } else { |
187 | ||
188 | /* Just a port */ | |
5198dabc LP |
189 | r = safe_atou(s, &u); |
190 | if (r < 0) | |
42f4e3c4 LP |
191 | return r; |
192 | ||
193 | if (u <= 0 || u > 0xFFFF) | |
194 | return -EINVAL; | |
195 | ||
5bfcc1c6 FF |
196 | if (socket_ipv6_is_supported()) { |
197 | a->sockaddr.in6.sin6_family = AF_INET6; | |
8e38570e | 198 | a->sockaddr.in6.sin6_port = htobe16((uint16_t)u); |
5bfcc1c6 FF |
199 | a->sockaddr.in6.sin6_addr = in6addr_any; |
200 | a->size = sizeof(struct sockaddr_in6); | |
201 | } else { | |
4d49b48c | 202 | a->sockaddr.in.sin_family = AF_INET; |
8e38570e | 203 | a->sockaddr.in.sin_port = htobe16((uint16_t)u); |
4d49b48c | 204 | a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
5bfcc1c6 FF |
205 | a->size = sizeof(struct sockaddr_in); |
206 | } | |
42f4e3c4 LP |
207 | } |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
7693146d LP |
213 | int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
214 | SocketAddress b; | |
215 | int r; | |
216 | ||
217 | /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ | |
218 | ||
219 | r = socket_address_parse(&b, s); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { | |
224 | log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); | |
225 | return -EAFNOSUPPORT; | |
226 | } | |
227 | ||
228 | *a = b; | |
229 | return 0; | |
230 | } | |
231 | ||
7a22745a LP |
232 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
233 | int family; | |
234 | unsigned group = 0; | |
f8b69d1d | 235 | _cleanup_free_ char *sfamily = NULL; |
7a22745a LP |
236 | assert(a); |
237 | assert(s); | |
238 | ||
239 | zero(*a); | |
240 | a->type = SOCK_RAW; | |
241 | ||
242 | errno = 0; | |
243 | if (sscanf(s, "%ms %u", &sfamily, &group) < 1) | |
bcb161b0 | 244 | return errno > 0 ? -errno : -EINVAL; |
7a22745a | 245 | |
f8b69d1d MS |
246 | family = netlink_family_from_string(sfamily); |
247 | if (family < 0) | |
248 | return -EINVAL; | |
7a22745a LP |
249 | |
250 | a->sockaddr.nl.nl_family = AF_NETLINK; | |
251 | a->sockaddr.nl.nl_groups = group; | |
252 | ||
253 | a->type = SOCK_RAW; | |
254 | a->size = sizeof(struct sockaddr_nl); | |
255 | a->protocol = family; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
542563ba | 260 | int socket_address_verify(const SocketAddress *a) { |
42f4e3c4 LP |
261 | assert(a); |
262 | ||
542563ba | 263 | switch (socket_address_family(a)) { |
42f4e3c4 | 264 | |
7a22745a LP |
265 | case AF_INET: |
266 | if (a->size != sizeof(struct sockaddr_in)) | |
267 | return -EINVAL; | |
42f4e3c4 | 268 | |
4d49b48c | 269 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 270 | return -EINVAL; |
42f4e3c4 | 271 | |
ec2ce0c5 | 272 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 273 | return -EINVAL; |
42f4e3c4 | 274 | |
7a22745a LP |
275 | return 0; |
276 | ||
277 | case AF_INET6: | |
278 | if (a->size != sizeof(struct sockaddr_in6)) | |
279 | return -EINVAL; | |
42f4e3c4 | 280 | |
7a22745a LP |
281 | if (a->sockaddr.in6.sin6_port == 0) |
282 | return -EINVAL; | |
42f4e3c4 | 283 | |
ec2ce0c5 | 284 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 285 | return -EINVAL; |
42f4e3c4 | 286 | |
7a22745a | 287 | return 0; |
42f4e3c4 | 288 | |
7a22745a LP |
289 | case AF_UNIX: |
290 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
291 | return -EINVAL; | |
42f4e3c4 | 292 | |
7a22745a | 293 | if (a->size > offsetof(struct sockaddr_un, sun_path)) { |
42f4e3c4 | 294 | |
7a22745a LP |
295 | if (a->sockaddr.un.sun_path[0] != 0) { |
296 | char *e; | |
297 | ||
298 | /* path */ | |
4d49b48c LP |
299 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
300 | if (!e) | |
7a22745a LP |
301 | return -EINVAL; |
302 | ||
303 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) | |
304 | return -EINVAL; | |
42f4e3c4 | 305 | } |
7a22745a | 306 | } |
42f4e3c4 | 307 | |
ec2ce0c5 | 308 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 309 | return -EINVAL; |
42f4e3c4 | 310 | |
7a22745a LP |
311 | return 0; |
312 | ||
313 | case AF_NETLINK: | |
314 | ||
315 | if (a->size != sizeof(struct sockaddr_nl)) | |
316 | return -EINVAL; | |
317 | ||
ec2ce0c5 | 318 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
319 | return -EINVAL; |
320 | ||
321 | return 0; | |
322 | ||
0fc0f14b SH |
323 | case AF_VSOCK: |
324 | if (a->size != sizeof(struct sockaddr_vm)) | |
325 | return -EINVAL; | |
326 | ||
ec2ce0c5 | 327 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
328 | return -EINVAL; |
329 | ||
330 | return 0; | |
331 | ||
7a22745a LP |
332 | default: |
333 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
334 | } |
335 | } | |
336 | ||
4d49b48c | 337 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 338 | int r; |
4d49b48c | 339 | |
42f4e3c4 | 340 | assert(a); |
4d49b48c | 341 | assert(ret); |
42f4e3c4 | 342 | |
4d49b48c LP |
343 | r = socket_address_verify(a); |
344 | if (r < 0) | |
42f4e3c4 LP |
345 | return r; |
346 | ||
4d49b48c | 347 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 348 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 349 | |
f8b69d1d | 350 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 351 | if (r < 0) |
f8b69d1d | 352 | return r; |
4d49b48c LP |
353 | |
354 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
355 | if (r < 0) |
356 | return -ENOMEM; | |
7a22745a LP |
357 | |
358 | return 0; | |
359 | } | |
360 | ||
3b1c5241 | 361 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
362 | } |
363 | ||
4f2d528d LP |
364 | bool socket_address_can_accept(const SocketAddress *a) { |
365 | assert(a); | |
366 | ||
367 | return | |
3742095b | 368 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 369 | } |
a16e1123 LP |
370 | |
371 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
372 | assert(a); | |
373 | assert(b); | |
374 | ||
375 | /* Invalid addresses are unequal to all */ | |
376 | if (socket_address_verify(a) < 0 || | |
377 | socket_address_verify(b) < 0) | |
378 | return false; | |
379 | ||
380 | if (a->type != b->type) | |
381 | return false; | |
382 | ||
a16e1123 LP |
383 | if (socket_address_family(a) != socket_address_family(b)) |
384 | return false; | |
385 | ||
386 | switch (socket_address_family(a)) { | |
387 | ||
388 | case AF_INET: | |
4d49b48c | 389 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
390 | return false; |
391 | ||
4d49b48c | 392 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
393 | return false; |
394 | ||
395 | break; | |
396 | ||
397 | case AF_INET6: | |
398 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
399 | return false; | |
400 | ||
401 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
402 | return false; | |
403 | ||
404 | break; | |
405 | ||
406 | case AF_UNIX: | |
710708a5 MS |
407 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
408 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
409 | return false; | |
410 | ||
a16e1123 LP |
411 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
412 | return false; | |
413 | ||
414 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 415 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
416 | return false; |
417 | } else { | |
c78e47a6 MS |
418 | if (a->size != b->size) |
419 | return false; | |
420 | ||
b12c1e7c | 421 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
422 | return false; |
423 | } | |
424 | ||
425 | break; | |
426 | ||
7a22745a | 427 | case AF_NETLINK: |
7a22745a LP |
428 | if (a->protocol != b->protocol) |
429 | return false; | |
430 | ||
431 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
432 | return false; | |
433 | ||
434 | break; | |
435 | ||
0fc0f14b SH |
436 | case AF_VSOCK: |
437 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
438 | return false; | |
439 | ||
440 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
441 | return false; | |
442 | ||
443 | break; | |
444 | ||
a16e1123 LP |
445 | default: |
446 | /* Cannot compare, so we assume the addresses are different */ | |
447 | return false; | |
448 | } | |
449 | ||
450 | return true; | |
451 | } | |
452 | ||
27ca8d7a | 453 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
454 | struct SocketAddress b; |
455 | ||
456 | assert(a); | |
457 | assert(s); | |
458 | ||
459 | if (socket_address_parse(&b, s) < 0) | |
460 | return false; | |
461 | ||
27ca8d7a LP |
462 | b.type = type; |
463 | ||
a16e1123 | 464 | return socket_address_equal(a, &b); |
6e2ef85b LP |
465 | } |
466 | ||
7a22745a LP |
467 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
468 | struct SocketAddress b; | |
469 | ||
470 | assert(a); | |
471 | assert(s); | |
472 | ||
473 | if (socket_address_parse_netlink(&b, s) < 0) | |
474 | return false; | |
475 | ||
476 | return socket_address_equal(a, &b); | |
477 | } | |
478 | ||
a57f7e2c | 479 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
480 | assert(a); |
481 | ||
482 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 483 | return NULL; |
6e2ef85b LP |
484 | |
485 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 486 | return NULL; |
a16e1123 | 487 | |
a57f7e2c | 488 | return a->sockaddr.un.sun_path; |
a16e1123 | 489 | } |
c0120d99 | 490 | |
5bfcc1c6 | 491 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 492 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 493 | return false; |
f89f1e8f | 494 | |
7377964d | 495 | return true; |
5bfcc1c6 FF |
496 | } |
497 | ||
01e10de3 | 498 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
499 | SocketAddress b; |
500 | socklen_t solen; | |
01e10de3 LP |
501 | |
502 | assert(a); | |
503 | assert(fd >= 0); | |
504 | ||
dbafedac MS |
505 | b.size = sizeof(b.sockaddr); |
506 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
507 | return false; |
508 | ||
dbafedac | 509 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
510 | return false; |
511 | ||
dbafedac MS |
512 | solen = sizeof(b.type); |
513 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
514 | return false; |
515 | ||
dbafedac | 516 | if (b.type != a->type) |
01e10de3 LP |
517 | return false; |
518 | ||
519 | if (a->protocol != 0) { | |
dbafedac MS |
520 | solen = sizeof(b.protocol); |
521 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
522 | return false; |
523 | ||
dbafedac | 524 | if (b.protocol != a->protocol) |
01e10de3 LP |
525 | return false; |
526 | } | |
527 | ||
02233928 | 528 | return socket_address_equal(a, &b); |
01e10de3 LP |
529 | } |
530 | ||
882ac6e7 | 531 | int sockaddr_port(const struct sockaddr *_sa, unsigned *port) { |
3b1c5241 SL |
532 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
533 | ||
534 | assert(sa); | |
535 | ||
0fc0f14b SH |
536 | switch (sa->sa.sa_family) { |
537 | case AF_INET: | |
538 | *port = be16toh(sa->in.sin_port); | |
539 | return 0; | |
3b1c5241 | 540 | |
0fc0f14b SH |
541 | case AF_INET6: |
542 | *port = be16toh(sa->in6.sin6_port); | |
543 | return 0; | |
544 | ||
545 | case AF_VSOCK: | |
546 | *port = sa->vm.svm_port; | |
547 | return 0; | |
548 | ||
549 | default: | |
550 | return -EAFNOSUPPORT; | |
551 | } | |
3b1c5241 SL |
552 | } |
553 | ||
554 | int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) { | |
4d49b48c | 555 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 556 | char *p; |
fc25ad25 | 557 | int r; |
8569a776 | 558 | |
4d49b48c LP |
559 | assert(sa); |
560 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 561 | |
4d49b48c | 562 | switch (sa->sa.sa_family) { |
8569a776 LP |
563 | |
564 | case AF_INET: { | |
565 | uint32_t a; | |
566 | ||
8e38570e | 567 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 568 | |
fc25ad25 ZJS |
569 | if (include_port) |
570 | r = asprintf(&p, | |
3b1c5241 SL |
571 | "%u.%u.%u.%u:%u", |
572 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 573 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
574 | else |
575 | r = asprintf(&p, | |
3b1c5241 | 576 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
577 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
578 | if (r < 0) | |
579 | return -ENOMEM; | |
8569a776 LP |
580 | break; |
581 | } | |
582 | ||
583 | case AF_INET6: { | |
584 | static const unsigned char ipv4_prefix[] = { | |
585 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
586 | }; | |
587 | ||
fc25ad25 ZJS |
588 | if (translate_ipv6 && |
589 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 590 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
591 | if (include_port) |
592 | r = asprintf(&p, | |
3b1c5241 SL |
593 | "%u.%u.%u.%u:%u", |
594 | a[0], a[1], a[2], a[3], | |
8e38570e | 595 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
596 | else |
597 | r = asprintf(&p, | |
3b1c5241 | 598 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
599 | a[0], a[1], a[2], a[3]); |
600 | if (r < 0) | |
601 | return -ENOMEM; | |
8569a776 LP |
602 | } else { |
603 | char a[INET6_ADDRSTRLEN]; | |
604 | ||
3b1c5241 SL |
605 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
606 | ||
607 | if (include_port) { | |
fc25ad25 | 608 | r = asprintf(&p, |
3b1c5241 SL |
609 | "[%s]:%u", |
610 | a, | |
8e38570e | 611 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 612 | if (r < 0) |
3b1c5241 SL |
613 | return -ENOMEM; |
614 | } else { | |
615 | p = strdup(a); | |
616 | if (!p) | |
617 | return -ENOMEM; | |
618 | } | |
8569a776 LP |
619 | } |
620 | ||
621 | break; | |
622 | } | |
623 | ||
4d49b48c LP |
624 | case AF_UNIX: |
625 | if (salen <= offsetof(struct sockaddr_un, sun_path)) { | |
626 | p = strdup("<unnamed>"); | |
627 | if (!p) | |
628 | return -ENOMEM; | |
8569a776 | 629 | |
4d49b48c LP |
630 | } else if (sa->un.sun_path[0] == 0) { |
631 | /* abstract */ | |
8569a776 | 632 | |
4d49b48c LP |
633 | /* FIXME: We assume we can print the |
634 | * socket path here and that it hasn't | |
635 | * more than one NUL byte. That is | |
636 | * actually an invalid assumption */ | |
637 | ||
638 | p = new(char, sizeof(sa->un.sun_path)+1); | |
639 | if (!p) | |
640 | return -ENOMEM; | |
641 | ||
642 | p[0] = '@'; | |
643 | memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1); | |
644 | p[sizeof(sa->un.sun_path)] = 0; | |
645 | ||
646 | } else { | |
647 | p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path)); | |
0810bc56 | 648 | if (!p) |
4d49b48c LP |
649 | return -ENOMEM; |
650 | } | |
8569a776 LP |
651 | |
652 | break; | |
8569a776 | 653 | |
0fc0f14b SH |
654 | case AF_VSOCK: |
655 | if (include_port) | |
656 | r = asprintf(&p, | |
657 | "vsock:%u:%u", | |
658 | sa->vm.svm_cid, | |
659 | sa->vm.svm_port); | |
660 | else | |
661 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); | |
662 | if (r < 0) | |
663 | return -ENOMEM; | |
664 | break; | |
665 | ||
8569a776 | 666 | default: |
15411c0c | 667 | return -EOPNOTSUPP; |
8569a776 LP |
668 | } |
669 | ||
4d49b48c | 670 | |
8569a776 LP |
671 | *ret = p; |
672 | return 0; | |
673 | } | |
674 | ||
366b7db4 | 675 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 676 | union sockaddr_union sa; |
b31f535c | 677 | socklen_t salen = sizeof(sa); |
eff05270 | 678 | int r; |
4d49b48c LP |
679 | |
680 | assert(fd >= 0); | |
681 | assert(ret); | |
682 | ||
4d49b48c LP |
683 | if (getpeername(fd, &sa.sa, &salen) < 0) |
684 | return -errno; | |
685 | ||
686 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 687 | struct ucred ucred = {}; |
4d49b48c LP |
688 | |
689 | /* UNIX connection sockets are anonymous, so let's use | |
690 | * PID/UID as pretty credentials instead */ | |
691 | ||
eff05270 LP |
692 | r = getpeercred(fd, &ucred); |
693 | if (r < 0) | |
694 | return r; | |
4d49b48c | 695 | |
de0671ee | 696 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
697 | return -ENOMEM; |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
703 | * if applicable, since that's nicer. */ | |
704 | ||
366b7db4 | 705 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
706 | } |
707 | ||
708 | int getsockname_pretty(int fd, char **ret) { | |
709 | union sockaddr_union sa; | |
b31f535c | 710 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
711 | |
712 | assert(fd >= 0); | |
713 | assert(ret); | |
714 | ||
4d49b48c LP |
715 | if (getsockname(fd, &sa.sa, &salen) < 0) |
716 | return -errno; | |
717 | ||
718 | /* For local sockets we do not translate IPv6 addresses back | |
719 | * to IPv6 if applicable, since this is usually used for | |
720 | * listening sockets where the difference between IPv4 and | |
721 | * IPv6 matters. */ | |
722 | ||
3b1c5241 | 723 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
724 | } |
725 | ||
b31f535c ZJS |
726 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
727 | int r; | |
728 | char host[NI_MAXHOST], *ret; | |
729 | ||
730 | assert(_ret); | |
731 | ||
6326a143 | 732 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 733 | if (r != 0) { |
b31f535c ZJS |
734 | int saved_errno = errno; |
735 | ||
3b1c5241 | 736 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 737 | if (r < 0) |
1938ac51 | 738 | return r; |
b31f535c | 739 | |
279d3c9c | 740 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
741 | } else { |
742 | ret = strdup(host); | |
743 | if (!ret) | |
1938ac51 | 744 | return -ENOMEM; |
cb651834 | 745 | } |
b31f535c ZJS |
746 | |
747 | *_ret = ret; | |
748 | return 0; | |
749 | } | |
750 | ||
751 | int getnameinfo_pretty(int fd, char **ret) { | |
752 | union sockaddr_union sa; | |
753 | socklen_t salen = sizeof(sa); | |
754 | ||
755 | assert(fd >= 0); | |
756 | assert(ret); | |
757 | ||
4a62c710 | 758 | if (getsockname(fd, &sa.sa, &salen) < 0) |
1938ac51 | 759 | return -errno; |
b31f535c ZJS |
760 | |
761 | return socknameinfo_pretty(&sa, salen, ret); | |
762 | } | |
763 | ||
bd1fe7c7 LP |
764 | int socket_address_unlink(SocketAddress *a) { |
765 | assert(a); | |
766 | ||
767 | if (socket_address_family(a) != AF_UNIX) | |
768 | return 0; | |
769 | ||
770 | if (a->sockaddr.un.sun_path[0] == 0) | |
771 | return 0; | |
772 | ||
773 | if (unlink(a->sockaddr.un.sun_path) < 0) | |
774 | return -errno; | |
775 | ||
776 | return 1; | |
777 | } | |
778 | ||
7a22745a LP |
779 | static const char* const netlink_family_table[] = { |
780 | [NETLINK_ROUTE] = "route", | |
781 | [NETLINK_FIREWALL] = "firewall", | |
782 | [NETLINK_INET_DIAG] = "inet-diag", | |
783 | [NETLINK_NFLOG] = "nflog", | |
784 | [NETLINK_XFRM] = "xfrm", | |
785 | [NETLINK_SELINUX] = "selinux", | |
786 | [NETLINK_ISCSI] = "iscsi", | |
787 | [NETLINK_AUDIT] = "audit", | |
788 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
789 | [NETLINK_CONNECTOR] = "connector", | |
790 | [NETLINK_NETFILTER] = "netfilter", | |
791 | [NETLINK_IP6_FW] = "ip6-fw", | |
792 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
793 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
794 | [NETLINK_GENERIC] = "generic", | |
795 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
796 | [NETLINK_ECRYPTFS] = "ecryptfs", |
797 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
798 | }; |
799 | ||
f8b69d1d | 800 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 801 | |
c0120d99 LP |
802 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
803 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
804 | [SOCKET_ADDRESS_BOTH] = "both", | |
805 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
806 | }; | |
807 | ||
808 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 LP |
809 | |
810 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { | |
811 | assert(a); | |
812 | assert(b); | |
813 | ||
814 | if (a->sa.sa_family != b->sa.sa_family) | |
815 | return false; | |
816 | ||
817 | if (a->sa.sa_family == AF_INET) | |
818 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
819 | ||
820 | if (a->sa.sa_family == AF_INET6) | |
821 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
822 | ||
0fc0f14b SH |
823 | if (a->sa.sa_family == AF_VSOCK) |
824 | return a->vm.svm_cid == b->vm.svm_cid; | |
825 | ||
f01e5736 LP |
826 | return false; |
827 | } | |
2583fbea LP |
828 | |
829 | int fd_inc_sndbuf(int fd, size_t n) { | |
830 | int r, value; | |
831 | socklen_t l = sizeof(value); | |
832 | ||
833 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
834 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
835 | return 0; | |
836 | ||
837 | /* If we have the privileges we will ignore the kernel limit. */ | |
838 | ||
839 | value = (int) n; | |
840 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) | |
841 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) | |
842 | return -errno; | |
843 | ||
844 | return 1; | |
845 | } | |
846 | ||
847 | int fd_inc_rcvbuf(int fd, size_t n) { | |
848 | int r, value; | |
849 | socklen_t l = sizeof(value); | |
850 | ||
851 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
852 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
853 | return 0; | |
854 | ||
855 | /* If we have the privileges we will ignore the kernel limit. */ | |
856 | ||
857 | value = (int) n; | |
858 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) | |
859 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) | |
860 | return -errno; | |
861 | return 1; | |
862 | } | |
863 | ||
864 | static const char* const ip_tos_table[] = { | |
865 | [IPTOS_LOWDELAY] = "low-delay", | |
866 | [IPTOS_THROUGHPUT] = "throughput", | |
867 | [IPTOS_RELIABILITY] = "reliability", | |
868 | [IPTOS_LOWCOST] = "low-cost", | |
869 | }; | |
870 | ||
871 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
872 | ||
ef76dff2 LP |
873 | bool ifname_valid(const char *p) { |
874 | bool numeric = true; | |
875 | ||
876 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
877 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
878 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
879 | ||
880 | if (isempty(p)) | |
881 | return false; | |
882 | ||
883 | if (strlen(p) >= IFNAMSIZ) | |
884 | return false; | |
885 | ||
49bfc877 | 886 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
887 | return false; |
888 | ||
889 | while (*p) { | |
890 | if ((unsigned char) *p >= 127U) | |
891 | return false; | |
892 | ||
893 | if ((unsigned char) *p <= 32U) | |
894 | return false; | |
895 | ||
4c701096 | 896 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
897 | return false; |
898 | ||
899 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
900 | p++; | |
901 | } | |
902 | ||
903 | if (numeric) | |
904 | return false; | |
905 | ||
906 | return true; | |
907 | } | |
908 | ||
26808948 SS |
909 | bool address_label_valid(const char *p) { |
910 | ||
911 | if (isempty(p)) | |
912 | return false; | |
913 | ||
914 | if (strlen(p) >= IFNAMSIZ) | |
915 | return false; | |
916 | ||
917 | while (*p) { | |
918 | if ((uint8_t) *p >= 127U) | |
919 | return false; | |
920 | ||
921 | if ((uint8_t) *p <= 31U) | |
922 | return false; | |
923 | p++; | |
924 | } | |
925 | ||
926 | return true; | |
927 | } | |
928 | ||
2583fbea LP |
929 | int getpeercred(int fd, struct ucred *ucred) { |
930 | socklen_t n = sizeof(struct ucred); | |
931 | struct ucred u; | |
932 | int r; | |
933 | ||
934 | assert(fd >= 0); | |
935 | assert(ucred); | |
936 | ||
937 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
938 | if (r < 0) | |
939 | return -errno; | |
940 | ||
941 | if (n != sizeof(struct ucred)) | |
942 | return -EIO; | |
943 | ||
944 | /* Check if the data is actually useful and not suppressed due | |
945 | * to namespacing issues */ | |
946 | if (u.pid <= 0) | |
947 | return -ENODATA; | |
948 | if (u.uid == UID_INVALID) | |
949 | return -ENODATA; | |
950 | if (u.gid == GID_INVALID) | |
951 | return -ENODATA; | |
952 | ||
953 | *ucred = u; | |
954 | return 0; | |
955 | } | |
956 | ||
957 | int getpeersec(int fd, char **ret) { | |
958 | socklen_t n = 64; | |
959 | char *s; | |
960 | int r; | |
961 | ||
962 | assert(fd >= 0); | |
963 | assert(ret); | |
964 | ||
965 | s = new0(char, n); | |
966 | if (!s) | |
967 | return -ENOMEM; | |
968 | ||
969 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
970 | if (r < 0) { | |
971 | free(s); | |
972 | ||
973 | if (errno != ERANGE) | |
974 | return -errno; | |
975 | ||
976 | s = new0(char, n); | |
977 | if (!s) | |
978 | return -ENOMEM; | |
979 | ||
980 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
981 | if (r < 0) { | |
982 | free(s); | |
983 | return -errno; | |
984 | } | |
985 | } | |
986 | ||
987 | if (isempty(s)) { | |
988 | free(s); | |
989 | return -EOPNOTSUPP; | |
990 | } | |
991 | ||
992 | *ret = s; | |
993 | return 0; | |
994 | } | |
995 | ||
726f4c47 ZJS |
996 | int send_one_fd_sa( |
997 | int transport_fd, | |
998 | int fd, | |
999 | const struct sockaddr *sa, socklen_t len, | |
1000 | int flags) { | |
1001 | ||
2583fbea LP |
1002 | union { |
1003 | struct cmsghdr cmsghdr; | |
1004 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1005 | } control = {}; | |
1006 | struct msghdr mh = { | |
726f4c47 ZJS |
1007 | .msg_name = (struct sockaddr*) sa, |
1008 | .msg_namelen = len, | |
2583fbea LP |
1009 | .msg_control = &control, |
1010 | .msg_controllen = sizeof(control), | |
1011 | }; | |
3c171f0b | 1012 | struct cmsghdr *cmsg; |
2583fbea LP |
1013 | |
1014 | assert(transport_fd >= 0); | |
1015 | assert(fd >= 0); | |
1016 | ||
1017 | cmsg = CMSG_FIRSTHDR(&mh); | |
1018 | cmsg->cmsg_level = SOL_SOCKET; | |
1019 | cmsg->cmsg_type = SCM_RIGHTS; | |
1020 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1021 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1022 | ||
1023 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1024 | if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0) | |
1025 | return -errno; | |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | int receive_one_fd(int transport_fd, int flags) { | |
1031 | union { | |
1032 | struct cmsghdr cmsghdr; | |
1033 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1034 | } control = {}; | |
1035 | struct msghdr mh = { | |
1036 | .msg_control = &control, | |
1037 | .msg_controllen = sizeof(control), | |
1038 | }; | |
1039 | struct cmsghdr *cmsg, *found = NULL; | |
1040 | ||
1041 | assert(transport_fd >= 0); | |
1042 | ||
1043 | /* | |
1044 | * Receive a single FD via @transport_fd. We don't care for | |
1045 | * the transport-type. We retrieve a single FD at most, so for | |
1046 | * packet-based transports, the caller must ensure to send | |
1047 | * only a single FD per packet. This is best used in | |
1048 | * combination with send_one_fd(). | |
1049 | */ | |
1050 | ||
1051 | if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0) | |
1052 | return -errno; | |
1053 | ||
1054 | CMSG_FOREACH(cmsg, &mh) { | |
1055 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1056 | cmsg->cmsg_type == SCM_RIGHTS && | |
1057 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1058 | assert(!found); | |
1059 | found = cmsg; | |
1060 | break; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | if (!found) { | |
1065 | cmsg_close_all(&mh); | |
1066 | return -EIO; | |
1067 | } | |
1068 | ||
1069 | return *(int*) CMSG_DATA(found); | |
1070 | } | |
4edc2c9b LP |
1071 | |
1072 | ssize_t next_datagram_size_fd(int fd) { | |
1073 | ssize_t l; | |
1074 | int k; | |
1075 | ||
1076 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1077 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1078 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1079 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1080 | * the wrong size. */ | |
1081 | ||
1082 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1083 | if (l < 0) { | |
3742095b | 1084 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1085 | goto fallback; |
1086 | ||
1087 | return -errno; | |
1088 | } | |
1089 | if (l == 0) | |
1090 | goto fallback; | |
1091 | ||
1092 | return l; | |
1093 | ||
1094 | fallback: | |
1095 | k = 0; | |
1096 | ||
1097 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1098 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1099 | ||
1100 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1101 | return -errno; | |
1102 | ||
1103 | return (ssize_t) k; | |
1104 | } | |
60d9771c LP |
1105 | |
1106 | int flush_accept(int fd) { | |
1107 | ||
1108 | struct pollfd pollfd = { | |
1109 | .fd = fd, | |
1110 | .events = POLLIN, | |
1111 | }; | |
1112 | int r; | |
1113 | ||
1114 | ||
1115 | /* Similar to flush_fd() but flushes all incoming connection by accepting them and immediately closing them. */ | |
1116 | ||
1117 | for (;;) { | |
1118 | int cfd; | |
1119 | ||
1120 | r = poll(&pollfd, 1, 0); | |
1121 | if (r < 0) { | |
1122 | if (errno == EINTR) | |
1123 | continue; | |
1124 | ||
1125 | return -errno; | |
1126 | ||
1127 | } else if (r == 0) | |
1128 | return 0; | |
1129 | ||
1130 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1131 | if (cfd < 0) { | |
1132 | if (errno == EINTR) | |
1133 | continue; | |
1134 | ||
1135 | if (errno == EAGAIN) | |
1136 | return 0; | |
1137 | ||
1138 | return -errno; | |
1139 | } | |
1140 | ||
1141 | close(cfd); | |
1142 | } | |
1143 | } | |
29206d46 LP |
1144 | |
1145 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1146 | struct cmsghdr *cmsg; | |
1147 | ||
1148 | assert(mh); | |
1149 | ||
1150 | CMSG_FOREACH(cmsg, mh) | |
1151 | if (cmsg->cmsg_level == level && | |
1152 | cmsg->cmsg_type == type && | |
1153 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1154 | return cmsg; | |
1155 | ||
1156 | return NULL; | |
1157 | } | |
429b4350 LP |
1158 | |
1159 | int socket_ioctl_fd(void) { | |
1160 | int fd; | |
1161 | ||
1162 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1163 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1164 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1165 | * generic AF_NETLINK. */ | |
1166 | ||
1167 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1168 | if (fd < 0) | |
1169 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1170 | if (fd < 0) | |
1171 | return -errno; | |
1172 | ||
1173 | return fd; | |
1174 | } |