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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 | ||
398ce0bc YW |
58 | static const char* const socket_address_type_table[] = { |
59 | [SOCK_STREAM] = "Stream", | |
60 | [SOCK_DGRAM] = "Datagram", | |
61 | [SOCK_RAW] = "Raw", | |
62 | [SOCK_RDM] = "ReliableDatagram", | |
63 | [SOCK_SEQPACKET] = "SequentialPacket", | |
64 | [SOCK_DCCP] = "DatagramCongestionControl", | |
65 | }; | |
66 | ||
67 | DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int); | |
68 | ||
542563ba | 69 | int socket_address_parse(SocketAddress *a, const char *s) { |
42f4e3c4 | 70 | char *e, *n; |
4d49b48c | 71 | int r; |
42f4e3c4 LP |
72 | |
73 | assert(a); | |
74 | assert(s); | |
75 | ||
9152c765 | 76 | zero(*a); |
542563ba | 77 | a->type = SOCK_STREAM; |
42f4e3c4 LP |
78 | |
79 | if (*s == '[') { | |
89220e2f LP |
80 | uint16_t port; |
81 | ||
42f4e3c4 LP |
82 | /* IPv6 in [x:.....:z]:p notation */ |
83 | ||
4d49b48c LP |
84 | e = strchr(s+1, ']'); |
85 | if (!e) | |
42f4e3c4 LP |
86 | return -EINVAL; |
87 | ||
4d49b48c | 88 | n = strndupa(s+1, e-s-1); |
42f4e3c4 LP |
89 | |
90 | errno = 0; | |
4d49b48c | 91 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
8333c77e | 92 | return errno > 0 ? -errno : -EINVAL; |
42f4e3c4 LP |
93 | |
94 | e++; | |
95 | if (*e != ':') | |
96 | return -EINVAL; | |
97 | ||
98 | e++; | |
89220e2f | 99 | r = parse_ip_port(e, &port); |
4d49b48c | 100 | if (r < 0) |
42f4e3c4 LP |
101 | return r; |
102 | ||
42f4e3c4 | 103 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 104 | a->sockaddr.in6.sin6_port = htobe16(port); |
42f4e3c4 | 105 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
106 | |
107 | } else if (*s == '/') { | |
108 | /* AF_UNIX socket */ | |
109 | ||
110 | size_t l; | |
111 | ||
112 | l = strlen(s); | |
113 | if (l >= sizeof(a->sockaddr.un.sun_path)) | |
114 | return -EINVAL; | |
115 | ||
116 | a->sockaddr.un.sun_family = AF_UNIX; | |
117 | memcpy(a->sockaddr.un.sun_path, s, l); | |
0e098b15 | 118 | a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
42f4e3c4 | 119 | |
1c24e7bd | 120 | } else if (*s == '@') { |
42f4e3c4 LP |
121 | /* Abstract AF_UNIX socket */ |
122 | size_t l; | |
123 | ||
124 | l = strlen(s+1); | |
125 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) | |
126 | return -EINVAL; | |
127 | ||
128 | a->sockaddr.un.sun_family = AF_UNIX; | |
129 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 130 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 131 | |
0fc0f14b SH |
132 | } else if (startswith(s, "vsock:")) { |
133 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
fbd0b64f | 134 | const char *cid_start = s + STRLEN("vsock:"); |
89220e2f | 135 | unsigned port; |
0fc0f14b SH |
136 | |
137 | e = strchr(cid_start, ':'); | |
138 | if (!e) | |
139 | return -EINVAL; | |
140 | ||
89220e2f | 141 | r = safe_atou(e+1, &port); |
0fc0f14b SH |
142 | if (r < 0) |
143 | return r; | |
144 | ||
145 | n = strndupa(cid_start, e - cid_start); | |
146 | if (!isempty(n)) { | |
147 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
148 | if (r < 0) | |
149 | return r; | |
150 | } else | |
151 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
152 | ||
153 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
89220e2f | 154 | a->sockaddr.vm.svm_port = port; |
0fc0f14b SH |
155 | a->size = sizeof(struct sockaddr_vm); |
156 | ||
42f4e3c4 | 157 | } else { |
89220e2f LP |
158 | uint16_t port; |
159 | ||
4d49b48c LP |
160 | e = strchr(s, ':'); |
161 | if (e) { | |
89220e2f | 162 | r = parse_ip_port(e + 1, &port); |
4d49b48c | 163 | if (r < 0) |
542563ba LP |
164 | return r; |
165 | ||
4d49b48c | 166 | n = strndupa(s, e-s); |
42f4e3c4 | 167 | |
542563ba | 168 | /* IPv4 in w.x.y.z:p notation? */ |
4d49b48c LP |
169 | r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
170 | if (r < 0) | |
542563ba | 171 | return -errno; |
42f4e3c4 | 172 | |
542563ba LP |
173 | if (r > 0) { |
174 | /* Gotcha, it's a traditional IPv4 address */ | |
4d49b48c | 175 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 176 | a->sockaddr.in.sin_port = htobe16(port); |
542563ba LP |
177 | a->size = sizeof(struct sockaddr_in); |
178 | } else { | |
179 | unsigned idx; | |
42f4e3c4 | 180 | |
4d49b48c | 181 | if (strlen(n) > IF_NAMESIZE-1) |
acbb0225 | 182 | return -EINVAL; |
acbb0225 | 183 | |
542563ba LP |
184 | /* Uh, our last resort, an interface name */ |
185 | idx = if_nametoindex(n); | |
83c60c9f | 186 | if (idx == 0) |
542563ba | 187 | return -EINVAL; |
42f4e3c4 | 188 | |
542563ba | 189 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 190 | a->sockaddr.in6.sin6_port = htobe16(port); |
542563ba | 191 | a->sockaddr.in6.sin6_scope_id = idx; |
83c60c9f | 192 | a->sockaddr.in6.sin6_addr = in6addr_any; |
542563ba LP |
193 | a->size = sizeof(struct sockaddr_in6); |
194 | } | |
42f4e3c4 LP |
195 | } else { |
196 | ||
197 | /* Just a port */ | |
89220e2f | 198 | r = parse_ip_port(s, &port); |
5198dabc | 199 | if (r < 0) |
42f4e3c4 LP |
200 | return r; |
201 | ||
5bfcc1c6 FF |
202 | if (socket_ipv6_is_supported()) { |
203 | a->sockaddr.in6.sin6_family = AF_INET6; | |
89220e2f | 204 | a->sockaddr.in6.sin6_port = htobe16(port); |
5bfcc1c6 FF |
205 | a->sockaddr.in6.sin6_addr = in6addr_any; |
206 | a->size = sizeof(struct sockaddr_in6); | |
207 | } else { | |
4d49b48c | 208 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 209 | a->sockaddr.in.sin_port = htobe16(port); |
4d49b48c | 210 | a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
5bfcc1c6 FF |
211 | a->size = sizeof(struct sockaddr_in); |
212 | } | |
42f4e3c4 LP |
213 | } |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
7693146d LP |
219 | int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
220 | SocketAddress b; | |
221 | int r; | |
222 | ||
223 | /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ | |
224 | ||
225 | r = socket_address_parse(&b, s); | |
226 | if (r < 0) | |
227 | return r; | |
228 | ||
229 | if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { | |
230 | log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); | |
231 | return -EAFNOSUPPORT; | |
232 | } | |
233 | ||
234 | *a = b; | |
235 | return 0; | |
236 | } | |
237 | ||
7a22745a LP |
238 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
239 | int family; | |
240 | unsigned group = 0; | |
f8b69d1d | 241 | _cleanup_free_ char *sfamily = NULL; |
7a22745a LP |
242 | assert(a); |
243 | assert(s); | |
244 | ||
245 | zero(*a); | |
246 | a->type = SOCK_RAW; | |
247 | ||
248 | errno = 0; | |
249 | if (sscanf(s, "%ms %u", &sfamily, &group) < 1) | |
bcb161b0 | 250 | return errno > 0 ? -errno : -EINVAL; |
7a22745a | 251 | |
f8b69d1d MS |
252 | family = netlink_family_from_string(sfamily); |
253 | if (family < 0) | |
254 | return -EINVAL; | |
7a22745a LP |
255 | |
256 | a->sockaddr.nl.nl_family = AF_NETLINK; | |
257 | a->sockaddr.nl.nl_groups = group; | |
258 | ||
259 | a->type = SOCK_RAW; | |
260 | a->size = sizeof(struct sockaddr_nl); | |
261 | a->protocol = family; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
542563ba | 266 | int socket_address_verify(const SocketAddress *a) { |
42f4e3c4 LP |
267 | assert(a); |
268 | ||
542563ba | 269 | switch (socket_address_family(a)) { |
42f4e3c4 | 270 | |
7a22745a LP |
271 | case AF_INET: |
272 | if (a->size != sizeof(struct sockaddr_in)) | |
273 | return -EINVAL; | |
42f4e3c4 | 274 | |
4d49b48c | 275 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 276 | return -EINVAL; |
42f4e3c4 | 277 | |
ec2ce0c5 | 278 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 279 | return -EINVAL; |
42f4e3c4 | 280 | |
7a22745a LP |
281 | return 0; |
282 | ||
283 | case AF_INET6: | |
284 | if (a->size != sizeof(struct sockaddr_in6)) | |
285 | return -EINVAL; | |
42f4e3c4 | 286 | |
7a22745a LP |
287 | if (a->sockaddr.in6.sin6_port == 0) |
288 | return -EINVAL; | |
42f4e3c4 | 289 | |
ec2ce0c5 | 290 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 291 | return -EINVAL; |
42f4e3c4 | 292 | |
7a22745a | 293 | return 0; |
42f4e3c4 | 294 | |
7a22745a LP |
295 | case AF_UNIX: |
296 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
297 | return -EINVAL; | |
42f4e3c4 | 298 | |
7a22745a | 299 | if (a->size > offsetof(struct sockaddr_un, sun_path)) { |
42f4e3c4 | 300 | |
7a22745a LP |
301 | if (a->sockaddr.un.sun_path[0] != 0) { |
302 | char *e; | |
303 | ||
304 | /* path */ | |
4d49b48c LP |
305 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
306 | if (!e) | |
7a22745a LP |
307 | return -EINVAL; |
308 | ||
309 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) | |
310 | return -EINVAL; | |
42f4e3c4 | 311 | } |
7a22745a | 312 | } |
42f4e3c4 | 313 | |
ec2ce0c5 | 314 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 315 | return -EINVAL; |
42f4e3c4 | 316 | |
7a22745a LP |
317 | return 0; |
318 | ||
319 | case AF_NETLINK: | |
320 | ||
321 | if (a->size != sizeof(struct sockaddr_nl)) | |
322 | return -EINVAL; | |
323 | ||
ec2ce0c5 | 324 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
325 | return -EINVAL; |
326 | ||
327 | return 0; | |
328 | ||
0fc0f14b SH |
329 | case AF_VSOCK: |
330 | if (a->size != sizeof(struct sockaddr_vm)) | |
331 | return -EINVAL; | |
332 | ||
ec2ce0c5 | 333 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
334 | return -EINVAL; |
335 | ||
336 | return 0; | |
337 | ||
7a22745a LP |
338 | default: |
339 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
340 | } |
341 | } | |
342 | ||
4d49b48c | 343 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 344 | int r; |
4d49b48c | 345 | |
42f4e3c4 | 346 | assert(a); |
4d49b48c | 347 | assert(ret); |
42f4e3c4 | 348 | |
4d49b48c LP |
349 | r = socket_address_verify(a); |
350 | if (r < 0) | |
42f4e3c4 LP |
351 | return r; |
352 | ||
4d49b48c | 353 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 354 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 355 | |
f8b69d1d | 356 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 357 | if (r < 0) |
f8b69d1d | 358 | return r; |
4d49b48c LP |
359 | |
360 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
361 | if (r < 0) |
362 | return -ENOMEM; | |
7a22745a LP |
363 | |
364 | return 0; | |
365 | } | |
366 | ||
3b1c5241 | 367 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
368 | } |
369 | ||
4f2d528d LP |
370 | bool socket_address_can_accept(const SocketAddress *a) { |
371 | assert(a); | |
372 | ||
373 | return | |
3742095b | 374 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 375 | } |
a16e1123 LP |
376 | |
377 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
378 | assert(a); | |
379 | assert(b); | |
380 | ||
381 | /* Invalid addresses are unequal to all */ | |
382 | if (socket_address_verify(a) < 0 || | |
383 | socket_address_verify(b) < 0) | |
384 | return false; | |
385 | ||
386 | if (a->type != b->type) | |
387 | return false; | |
388 | ||
a16e1123 LP |
389 | if (socket_address_family(a) != socket_address_family(b)) |
390 | return false; | |
391 | ||
392 | switch (socket_address_family(a)) { | |
393 | ||
394 | case AF_INET: | |
4d49b48c | 395 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
396 | return false; |
397 | ||
4d49b48c | 398 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
399 | return false; |
400 | ||
401 | break; | |
402 | ||
403 | case AF_INET6: | |
404 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
405 | return false; | |
406 | ||
407 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
408 | return false; | |
409 | ||
410 | break; | |
411 | ||
412 | case AF_UNIX: | |
710708a5 MS |
413 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
414 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
415 | return false; | |
416 | ||
a16e1123 LP |
417 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
418 | return false; | |
419 | ||
420 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 421 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
422 | return false; |
423 | } else { | |
c78e47a6 MS |
424 | if (a->size != b->size) |
425 | return false; | |
426 | ||
b12c1e7c | 427 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
428 | return false; |
429 | } | |
430 | ||
431 | break; | |
432 | ||
7a22745a | 433 | case AF_NETLINK: |
7a22745a LP |
434 | if (a->protocol != b->protocol) |
435 | return false; | |
436 | ||
437 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
438 | return false; | |
439 | ||
440 | break; | |
441 | ||
0fc0f14b SH |
442 | case AF_VSOCK: |
443 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
444 | return false; | |
445 | ||
446 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
447 | return false; | |
448 | ||
449 | break; | |
450 | ||
a16e1123 LP |
451 | default: |
452 | /* Cannot compare, so we assume the addresses are different */ | |
453 | return false; | |
454 | } | |
455 | ||
456 | return true; | |
457 | } | |
458 | ||
27ca8d7a | 459 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
460 | struct SocketAddress b; |
461 | ||
462 | assert(a); | |
463 | assert(s); | |
464 | ||
465 | if (socket_address_parse(&b, s) < 0) | |
466 | return false; | |
467 | ||
27ca8d7a LP |
468 | b.type = type; |
469 | ||
a16e1123 | 470 | return socket_address_equal(a, &b); |
6e2ef85b LP |
471 | } |
472 | ||
7a22745a LP |
473 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
474 | struct SocketAddress b; | |
475 | ||
476 | assert(a); | |
477 | assert(s); | |
478 | ||
479 | if (socket_address_parse_netlink(&b, s) < 0) | |
480 | return false; | |
481 | ||
482 | return socket_address_equal(a, &b); | |
483 | } | |
484 | ||
a57f7e2c | 485 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
486 | assert(a); |
487 | ||
488 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 489 | return NULL; |
6e2ef85b LP |
490 | |
491 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 492 | return NULL; |
a16e1123 | 493 | |
a57f7e2c | 494 | return a->sockaddr.un.sun_path; |
a16e1123 | 495 | } |
c0120d99 | 496 | |
5bfcc1c6 | 497 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 498 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 499 | return false; |
f89f1e8f | 500 | |
7377964d | 501 | return true; |
5bfcc1c6 FF |
502 | } |
503 | ||
01e10de3 | 504 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
505 | SocketAddress b; |
506 | socklen_t solen; | |
01e10de3 LP |
507 | |
508 | assert(a); | |
509 | assert(fd >= 0); | |
510 | ||
dbafedac MS |
511 | b.size = sizeof(b.sockaddr); |
512 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
513 | return false; |
514 | ||
dbafedac | 515 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
516 | return false; |
517 | ||
dbafedac MS |
518 | solen = sizeof(b.type); |
519 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
520 | return false; |
521 | ||
dbafedac | 522 | if (b.type != a->type) |
01e10de3 LP |
523 | return false; |
524 | ||
525 | if (a->protocol != 0) { | |
dbafedac MS |
526 | solen = sizeof(b.protocol); |
527 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
528 | return false; |
529 | ||
dbafedac | 530 | if (b.protocol != a->protocol) |
01e10de3 LP |
531 | return false; |
532 | } | |
533 | ||
02233928 | 534 | return socket_address_equal(a, &b); |
01e10de3 LP |
535 | } |
536 | ||
f6aac5bf | 537 | int sockaddr_port(const struct sockaddr *_sa, unsigned *ret_port) { |
3b1c5241 SL |
538 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
539 | ||
f6aac5bf LP |
540 | /* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */ |
541 | ||
3b1c5241 SL |
542 | assert(sa); |
543 | ||
0fc0f14b | 544 | switch (sa->sa.sa_family) { |
f6aac5bf | 545 | |
0fc0f14b | 546 | case AF_INET: |
f6aac5bf | 547 | *ret_port = be16toh(sa->in.sin_port); |
0fc0f14b | 548 | return 0; |
3b1c5241 | 549 | |
0fc0f14b | 550 | case AF_INET6: |
f6aac5bf | 551 | *ret_port = be16toh(sa->in6.sin6_port); |
0fc0f14b SH |
552 | return 0; |
553 | ||
554 | case AF_VSOCK: | |
f6aac5bf | 555 | *ret_port = sa->vm.svm_port; |
0fc0f14b SH |
556 | return 0; |
557 | ||
558 | default: | |
559 | return -EAFNOSUPPORT; | |
560 | } | |
3b1c5241 SL |
561 | } |
562 | ||
563 | int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) { | |
4d49b48c | 564 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 565 | char *p; |
fc25ad25 | 566 | int r; |
8569a776 | 567 | |
4d49b48c LP |
568 | assert(sa); |
569 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 570 | |
4d49b48c | 571 | switch (sa->sa.sa_family) { |
8569a776 LP |
572 | |
573 | case AF_INET: { | |
574 | uint32_t a; | |
575 | ||
8e38570e | 576 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 577 | |
fc25ad25 ZJS |
578 | if (include_port) |
579 | r = asprintf(&p, | |
3b1c5241 SL |
580 | "%u.%u.%u.%u:%u", |
581 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 582 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
583 | else |
584 | r = asprintf(&p, | |
3b1c5241 | 585 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
586 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
587 | if (r < 0) | |
588 | return -ENOMEM; | |
8569a776 LP |
589 | break; |
590 | } | |
591 | ||
592 | case AF_INET6: { | |
593 | static const unsigned char ipv4_prefix[] = { | |
594 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
595 | }; | |
596 | ||
fc25ad25 ZJS |
597 | if (translate_ipv6 && |
598 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 599 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
600 | if (include_port) |
601 | r = asprintf(&p, | |
3b1c5241 SL |
602 | "%u.%u.%u.%u:%u", |
603 | a[0], a[1], a[2], a[3], | |
8e38570e | 604 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
605 | else |
606 | r = asprintf(&p, | |
3b1c5241 | 607 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
608 | a[0], a[1], a[2], a[3]); |
609 | if (r < 0) | |
610 | return -ENOMEM; | |
8569a776 LP |
611 | } else { |
612 | char a[INET6_ADDRSTRLEN]; | |
613 | ||
3b1c5241 SL |
614 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
615 | ||
616 | if (include_port) { | |
fc25ad25 | 617 | r = asprintf(&p, |
3b1c5241 SL |
618 | "[%s]:%u", |
619 | a, | |
8e38570e | 620 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 621 | if (r < 0) |
3b1c5241 SL |
622 | return -ENOMEM; |
623 | } else { | |
624 | p = strdup(a); | |
625 | if (!p) | |
626 | return -ENOMEM; | |
627 | } | |
8569a776 LP |
628 | } |
629 | ||
630 | break; | |
631 | } | |
632 | ||
4d49b48c LP |
633 | case AF_UNIX: |
634 | if (salen <= offsetof(struct sockaddr_un, sun_path)) { | |
635 | p = strdup("<unnamed>"); | |
636 | if (!p) | |
637 | return -ENOMEM; | |
8569a776 | 638 | |
4d49b48c LP |
639 | } else if (sa->un.sun_path[0] == 0) { |
640 | /* abstract */ | |
8569a776 | 641 | |
4d49b48c LP |
642 | /* FIXME: We assume we can print the |
643 | * socket path here and that it hasn't | |
644 | * more than one NUL byte. That is | |
645 | * actually an invalid assumption */ | |
646 | ||
647 | p = new(char, sizeof(sa->un.sun_path)+1); | |
648 | if (!p) | |
649 | return -ENOMEM; | |
650 | ||
651 | p[0] = '@'; | |
652 | memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1); | |
653 | p[sizeof(sa->un.sun_path)] = 0; | |
654 | ||
655 | } else { | |
656 | p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path)); | |
0810bc56 | 657 | if (!p) |
4d49b48c LP |
658 | return -ENOMEM; |
659 | } | |
8569a776 LP |
660 | |
661 | break; | |
8569a776 | 662 | |
0fc0f14b SH |
663 | case AF_VSOCK: |
664 | if (include_port) | |
665 | r = asprintf(&p, | |
666 | "vsock:%u:%u", | |
667 | sa->vm.svm_cid, | |
668 | sa->vm.svm_port); | |
669 | else | |
670 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); | |
671 | if (r < 0) | |
672 | return -ENOMEM; | |
673 | break; | |
674 | ||
8569a776 | 675 | default: |
15411c0c | 676 | return -EOPNOTSUPP; |
8569a776 LP |
677 | } |
678 | ||
4d49b48c | 679 | |
8569a776 LP |
680 | *ret = p; |
681 | return 0; | |
682 | } | |
683 | ||
366b7db4 | 684 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 685 | union sockaddr_union sa; |
b31f535c | 686 | socklen_t salen = sizeof(sa); |
eff05270 | 687 | int r; |
4d49b48c LP |
688 | |
689 | assert(fd >= 0); | |
690 | assert(ret); | |
691 | ||
4d49b48c LP |
692 | if (getpeername(fd, &sa.sa, &salen) < 0) |
693 | return -errno; | |
694 | ||
695 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 696 | struct ucred ucred = {}; |
4d49b48c LP |
697 | |
698 | /* UNIX connection sockets are anonymous, so let's use | |
699 | * PID/UID as pretty credentials instead */ | |
700 | ||
eff05270 LP |
701 | r = getpeercred(fd, &ucred); |
702 | if (r < 0) | |
703 | return r; | |
4d49b48c | 704 | |
de0671ee | 705 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
706 | return -ENOMEM; |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
712 | * if applicable, since that's nicer. */ | |
713 | ||
366b7db4 | 714 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
715 | } |
716 | ||
717 | int getsockname_pretty(int fd, char **ret) { | |
718 | union sockaddr_union sa; | |
b31f535c | 719 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
720 | |
721 | assert(fd >= 0); | |
722 | assert(ret); | |
723 | ||
4d49b48c LP |
724 | if (getsockname(fd, &sa.sa, &salen) < 0) |
725 | return -errno; | |
726 | ||
727 | /* For local sockets we do not translate IPv6 addresses back | |
728 | * to IPv6 if applicable, since this is usually used for | |
729 | * listening sockets where the difference between IPv4 and | |
730 | * IPv6 matters. */ | |
731 | ||
3b1c5241 | 732 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
733 | } |
734 | ||
b31f535c ZJS |
735 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
736 | int r; | |
737 | char host[NI_MAXHOST], *ret; | |
738 | ||
739 | assert(_ret); | |
740 | ||
6326a143 | 741 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 742 | if (r != 0) { |
b31f535c ZJS |
743 | int saved_errno = errno; |
744 | ||
3b1c5241 | 745 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 746 | if (r < 0) |
1938ac51 | 747 | return r; |
b31f535c | 748 | |
279d3c9c | 749 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
750 | } else { |
751 | ret = strdup(host); | |
752 | if (!ret) | |
1938ac51 | 753 | return -ENOMEM; |
cb651834 | 754 | } |
b31f535c ZJS |
755 | |
756 | *_ret = ret; | |
757 | return 0; | |
758 | } | |
759 | ||
760 | int getnameinfo_pretty(int fd, char **ret) { | |
761 | union sockaddr_union sa; | |
762 | socklen_t salen = sizeof(sa); | |
763 | ||
764 | assert(fd >= 0); | |
765 | assert(ret); | |
766 | ||
4a62c710 | 767 | if (getsockname(fd, &sa.sa, &salen) < 0) |
1938ac51 | 768 | return -errno; |
b31f535c ZJS |
769 | |
770 | return socknameinfo_pretty(&sa, salen, ret); | |
771 | } | |
772 | ||
bd1fe7c7 LP |
773 | int socket_address_unlink(SocketAddress *a) { |
774 | assert(a); | |
775 | ||
776 | if (socket_address_family(a) != AF_UNIX) | |
777 | return 0; | |
778 | ||
779 | if (a->sockaddr.un.sun_path[0] == 0) | |
780 | return 0; | |
781 | ||
782 | if (unlink(a->sockaddr.un.sun_path) < 0) | |
783 | return -errno; | |
784 | ||
785 | return 1; | |
786 | } | |
787 | ||
7a22745a LP |
788 | static const char* const netlink_family_table[] = { |
789 | [NETLINK_ROUTE] = "route", | |
790 | [NETLINK_FIREWALL] = "firewall", | |
791 | [NETLINK_INET_DIAG] = "inet-diag", | |
792 | [NETLINK_NFLOG] = "nflog", | |
793 | [NETLINK_XFRM] = "xfrm", | |
794 | [NETLINK_SELINUX] = "selinux", | |
795 | [NETLINK_ISCSI] = "iscsi", | |
796 | [NETLINK_AUDIT] = "audit", | |
797 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
798 | [NETLINK_CONNECTOR] = "connector", | |
799 | [NETLINK_NETFILTER] = "netfilter", | |
800 | [NETLINK_IP6_FW] = "ip6-fw", | |
801 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
802 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
803 | [NETLINK_GENERIC] = "generic", | |
804 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
805 | [NETLINK_ECRYPTFS] = "ecryptfs", |
806 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
807 | }; |
808 | ||
f8b69d1d | 809 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 810 | |
c0120d99 LP |
811 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
812 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
813 | [SOCKET_ADDRESS_BOTH] = "both", | |
814 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
815 | }; | |
816 | ||
817 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 | 818 | |
6f90844f YW |
819 | SocketAddressBindIPv6Only parse_socket_address_bind_ipv6_only_or_bool(const char *n) { |
820 | int r; | |
821 | ||
822 | r = parse_boolean(n); | |
823 | if (r > 0) | |
824 | return SOCKET_ADDRESS_IPV6_ONLY; | |
825 | if (r == 0) | |
826 | return SOCKET_ADDRESS_BOTH; | |
827 | ||
828 | return socket_address_bind_ipv6_only_from_string(n); | |
829 | } | |
830 | ||
f01e5736 LP |
831 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { |
832 | assert(a); | |
833 | assert(b); | |
834 | ||
835 | if (a->sa.sa_family != b->sa.sa_family) | |
836 | return false; | |
837 | ||
838 | if (a->sa.sa_family == AF_INET) | |
839 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
840 | ||
841 | if (a->sa.sa_family == AF_INET6) | |
842 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
843 | ||
0fc0f14b SH |
844 | if (a->sa.sa_family == AF_VSOCK) |
845 | return a->vm.svm_cid == b->vm.svm_cid; | |
846 | ||
f01e5736 LP |
847 | return false; |
848 | } | |
2583fbea LP |
849 | |
850 | int fd_inc_sndbuf(int fd, size_t n) { | |
851 | int r, value; | |
852 | socklen_t l = sizeof(value); | |
853 | ||
854 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
855 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
856 | return 0; | |
857 | ||
858 | /* If we have the privileges we will ignore the kernel limit. */ | |
859 | ||
860 | value = (int) n; | |
861 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) | |
862 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) | |
863 | return -errno; | |
864 | ||
865 | return 1; | |
866 | } | |
867 | ||
868 | int fd_inc_rcvbuf(int fd, size_t n) { | |
869 | int r, value; | |
870 | socklen_t l = sizeof(value); | |
871 | ||
872 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
873 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
874 | return 0; | |
875 | ||
876 | /* If we have the privileges we will ignore the kernel limit. */ | |
877 | ||
878 | value = (int) n; | |
879 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) | |
880 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) | |
881 | return -errno; | |
882 | return 1; | |
883 | } | |
884 | ||
885 | static const char* const ip_tos_table[] = { | |
886 | [IPTOS_LOWDELAY] = "low-delay", | |
887 | [IPTOS_THROUGHPUT] = "throughput", | |
888 | [IPTOS_RELIABILITY] = "reliability", | |
889 | [IPTOS_LOWCOST] = "low-cost", | |
890 | }; | |
891 | ||
892 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
893 | ||
ef76dff2 LP |
894 | bool ifname_valid(const char *p) { |
895 | bool numeric = true; | |
896 | ||
897 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
898 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
899 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
900 | ||
901 | if (isempty(p)) | |
902 | return false; | |
903 | ||
904 | if (strlen(p) >= IFNAMSIZ) | |
905 | return false; | |
906 | ||
49bfc877 | 907 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
908 | return false; |
909 | ||
910 | while (*p) { | |
911 | if ((unsigned char) *p >= 127U) | |
912 | return false; | |
913 | ||
914 | if ((unsigned char) *p <= 32U) | |
915 | return false; | |
916 | ||
4c701096 | 917 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
918 | return false; |
919 | ||
920 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
921 | p++; | |
922 | } | |
923 | ||
924 | if (numeric) | |
925 | return false; | |
926 | ||
927 | return true; | |
928 | } | |
929 | ||
26808948 SS |
930 | bool address_label_valid(const char *p) { |
931 | ||
932 | if (isempty(p)) | |
933 | return false; | |
934 | ||
935 | if (strlen(p) >= IFNAMSIZ) | |
936 | return false; | |
937 | ||
938 | while (*p) { | |
939 | if ((uint8_t) *p >= 127U) | |
940 | return false; | |
941 | ||
942 | if ((uint8_t) *p <= 31U) | |
943 | return false; | |
944 | p++; | |
945 | } | |
946 | ||
947 | return true; | |
948 | } | |
949 | ||
2583fbea LP |
950 | int getpeercred(int fd, struct ucred *ucred) { |
951 | socklen_t n = sizeof(struct ucred); | |
952 | struct ucred u; | |
953 | int r; | |
954 | ||
955 | assert(fd >= 0); | |
956 | assert(ucred); | |
957 | ||
958 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
959 | if (r < 0) | |
960 | return -errno; | |
961 | ||
962 | if (n != sizeof(struct ucred)) | |
963 | return -EIO; | |
964 | ||
bbcc701e LP |
965 | /* Check if the data is actually useful and not suppressed due to namespacing issues */ |
966 | if (!pid_is_valid(u.pid)) | |
2583fbea LP |
967 | return -ENODATA; |
968 | ||
bbcc701e LP |
969 | /* Note that we don't check UID/GID here, as namespace translation works differently there: instead of |
970 | * receiving in "invalid" user/group we get the overflow UID/GID. */ | |
971 | ||
2583fbea LP |
972 | *ucred = u; |
973 | return 0; | |
974 | } | |
975 | ||
976 | int getpeersec(int fd, char **ret) { | |
217d8967 | 977 | _cleanup_free_ char *s = NULL; |
2583fbea | 978 | socklen_t n = 64; |
2583fbea LP |
979 | |
980 | assert(fd >= 0); | |
981 | assert(ret); | |
982 | ||
217d8967 LP |
983 | for (;;) { |
984 | s = new0(char, n+1); | |
985 | if (!s) | |
986 | return -ENOMEM; | |
2583fbea | 987 | |
217d8967 LP |
988 | if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0) |
989 | break; | |
2583fbea LP |
990 | |
991 | if (errno != ERANGE) | |
992 | return -errno; | |
993 | ||
217d8967 | 994 | s = mfree(s); |
2583fbea LP |
995 | } |
996 | ||
217d8967 | 997 | if (isempty(s)) |
2583fbea | 998 | return -EOPNOTSUPP; |
2583fbea LP |
999 | |
1000 | *ret = s; | |
217d8967 LP |
1001 | s = NULL; |
1002 | ||
2583fbea LP |
1003 | return 0; |
1004 | } | |
1005 | ||
43f2c88d LP |
1006 | int getpeergroups(int fd, gid_t **ret) { |
1007 | socklen_t n = sizeof(gid_t) * 64; | |
1008 | _cleanup_free_ gid_t *d = NULL; | |
1009 | ||
1010 | assert(fd); | |
1011 | assert(ret); | |
1012 | ||
1013 | for (;;) { | |
1014 | d = malloc(n); | |
1015 | if (!d) | |
1016 | return -ENOMEM; | |
1017 | ||
1018 | if (getsockopt(fd, SOL_SOCKET, SO_PEERGROUPS, d, &n) >= 0) | |
1019 | break; | |
1020 | ||
1021 | if (errno != ERANGE) | |
1022 | return -errno; | |
1023 | ||
1024 | d = mfree(d); | |
1025 | } | |
1026 | ||
1027 | assert_se(n % sizeof(gid_t) == 0); | |
1028 | n /= sizeof(gid_t); | |
1029 | ||
1030 | if ((socklen_t) (int) n != n) | |
1031 | return -E2BIG; | |
1032 | ||
1033 | *ret = d; | |
1034 | d = NULL; | |
1035 | ||
1036 | return (int) n; | |
1037 | } | |
1038 | ||
726f4c47 ZJS |
1039 | int send_one_fd_sa( |
1040 | int transport_fd, | |
1041 | int fd, | |
1042 | const struct sockaddr *sa, socklen_t len, | |
1043 | int flags) { | |
1044 | ||
2583fbea LP |
1045 | union { |
1046 | struct cmsghdr cmsghdr; | |
1047 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1048 | } control = {}; | |
1049 | struct msghdr mh = { | |
726f4c47 ZJS |
1050 | .msg_name = (struct sockaddr*) sa, |
1051 | .msg_namelen = len, | |
2583fbea LP |
1052 | .msg_control = &control, |
1053 | .msg_controllen = sizeof(control), | |
1054 | }; | |
3c171f0b | 1055 | struct cmsghdr *cmsg; |
2583fbea LP |
1056 | |
1057 | assert(transport_fd >= 0); | |
1058 | assert(fd >= 0); | |
1059 | ||
1060 | cmsg = CMSG_FIRSTHDR(&mh); | |
1061 | cmsg->cmsg_level = SOL_SOCKET; | |
1062 | cmsg->cmsg_type = SCM_RIGHTS; | |
1063 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1064 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1065 | ||
1066 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1067 | if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0) | |
1068 | return -errno; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | int receive_one_fd(int transport_fd, int flags) { | |
1074 | union { | |
1075 | struct cmsghdr cmsghdr; | |
1076 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1077 | } control = {}; | |
1078 | struct msghdr mh = { | |
1079 | .msg_control = &control, | |
1080 | .msg_controllen = sizeof(control), | |
1081 | }; | |
1082 | struct cmsghdr *cmsg, *found = NULL; | |
1083 | ||
1084 | assert(transport_fd >= 0); | |
1085 | ||
1086 | /* | |
1087 | * Receive a single FD via @transport_fd. We don't care for | |
1088 | * the transport-type. We retrieve a single FD at most, so for | |
1089 | * packet-based transports, the caller must ensure to send | |
1090 | * only a single FD per packet. This is best used in | |
1091 | * combination with send_one_fd(). | |
1092 | */ | |
1093 | ||
1094 | if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0) | |
1095 | return -errno; | |
1096 | ||
1097 | CMSG_FOREACH(cmsg, &mh) { | |
1098 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1099 | cmsg->cmsg_type == SCM_RIGHTS && | |
1100 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1101 | assert(!found); | |
1102 | found = cmsg; | |
1103 | break; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | if (!found) { | |
1108 | cmsg_close_all(&mh); | |
1109 | return -EIO; | |
1110 | } | |
1111 | ||
1112 | return *(int*) CMSG_DATA(found); | |
1113 | } | |
4edc2c9b LP |
1114 | |
1115 | ssize_t next_datagram_size_fd(int fd) { | |
1116 | ssize_t l; | |
1117 | int k; | |
1118 | ||
1119 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1120 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1121 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1122 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1123 | * the wrong size. */ | |
1124 | ||
1125 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1126 | if (l < 0) { | |
3742095b | 1127 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1128 | goto fallback; |
1129 | ||
1130 | return -errno; | |
1131 | } | |
1132 | if (l == 0) | |
1133 | goto fallback; | |
1134 | ||
1135 | return l; | |
1136 | ||
1137 | fallback: | |
1138 | k = 0; | |
1139 | ||
1140 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1141 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1142 | ||
1143 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1144 | return -errno; | |
1145 | ||
1146 | return (ssize_t) k; | |
1147 | } | |
60d9771c LP |
1148 | |
1149 | int flush_accept(int fd) { | |
1150 | ||
1151 | struct pollfd pollfd = { | |
1152 | .fd = fd, | |
1153 | .events = POLLIN, | |
1154 | }; | |
1155 | int r; | |
1156 | ||
1157 | ||
1158 | /* Similar to flush_fd() but flushes all incoming connection by accepting them and immediately closing them. */ | |
1159 | ||
1160 | for (;;) { | |
1161 | int cfd; | |
1162 | ||
1163 | r = poll(&pollfd, 1, 0); | |
1164 | if (r < 0) { | |
1165 | if (errno == EINTR) | |
1166 | continue; | |
1167 | ||
1168 | return -errno; | |
1169 | ||
1170 | } else if (r == 0) | |
1171 | return 0; | |
1172 | ||
1173 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1174 | if (cfd < 0) { | |
1175 | if (errno == EINTR) | |
1176 | continue; | |
1177 | ||
1178 | if (errno == EAGAIN) | |
1179 | return 0; | |
1180 | ||
1181 | return -errno; | |
1182 | } | |
1183 | ||
1184 | close(cfd); | |
1185 | } | |
1186 | } | |
29206d46 LP |
1187 | |
1188 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1189 | struct cmsghdr *cmsg; | |
1190 | ||
1191 | assert(mh); | |
1192 | ||
1193 | CMSG_FOREACH(cmsg, mh) | |
1194 | if (cmsg->cmsg_level == level && | |
1195 | cmsg->cmsg_type == type && | |
1196 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1197 | return cmsg; | |
1198 | ||
1199 | return NULL; | |
1200 | } | |
429b4350 LP |
1201 | |
1202 | int socket_ioctl_fd(void) { | |
1203 | int fd; | |
1204 | ||
1205 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1206 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1207 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1208 | * generic AF_NETLINK. */ | |
1209 | ||
1210 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1211 | if (fd < 0) | |
1212 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1213 | if (fd < 0) | |
1214 | return -errno; | |
1215 | ||
1216 | return fd; | |
1217 | } |