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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 | |
a7334b09 LP |
6 | ***/ |
7 | ||
42f4e3c4 | 8 | #include <arpa/inet.h> |
07630cea | 9 | #include <errno.h> |
11c3a366 | 10 | #include <limits.h> |
542563ba | 11 | #include <net/if.h> |
b31f535c | 12 | #include <netdb.h> |
2583fbea | 13 | #include <netinet/ip.h> |
60d9771c | 14 | #include <poll.h> |
07630cea | 15 | #include <stddef.h> |
11c3a366 | 16 | #include <stdint.h> |
07630cea | 17 | #include <stdio.h> |
11c3a366 | 18 | #include <stdlib.h> |
07630cea | 19 | #include <string.h> |
07630cea | 20 | #include <unistd.h> |
42f4e3c4 | 21 | |
b5efdb8a | 22 | #include "alloc-util.h" |
2583fbea | 23 | #include "fd-util.h" |
07630cea | 24 | #include "fileio.h" |
f97b34a6 | 25 | #include "format-util.h" |
93cc7779 | 26 | #include "log.h" |
42f4e3c4 | 27 | #include "macro.h" |
07630cea | 28 | #include "missing.h" |
6bedfcbb | 29 | #include "parse-util.h" |
9eb977db | 30 | #include "path-util.h" |
dccca82b | 31 | #include "process-util.h" |
2583fbea | 32 | #include "socket-util.h" |
8b43440b | 33 | #include "string-table.h" |
07630cea | 34 | #include "string-util.h" |
ef76dff2 | 35 | #include "strv.h" |
ee104e11 | 36 | #include "user-util.h" |
ef76dff2 | 37 | #include "utf8.h" |
2eec67ac | 38 | #include "util.h" |
42f4e3c4 | 39 | |
349cc4a5 | 40 | #if ENABLE_IDN |
cadc80b8 | 41 | # define IDN_FLAGS NI_IDN |
6326a143 WB |
42 | #else |
43 | # define IDN_FLAGS 0 | |
44 | #endif | |
45 | ||
398ce0bc YW |
46 | static const char* const socket_address_type_table[] = { |
47 | [SOCK_STREAM] = "Stream", | |
48 | [SOCK_DGRAM] = "Datagram", | |
49 | [SOCK_RAW] = "Raw", | |
50 | [SOCK_RDM] = "ReliableDatagram", | |
51 | [SOCK_SEQPACKET] = "SequentialPacket", | |
52 | [SOCK_DCCP] = "DatagramCongestionControl", | |
53 | }; | |
54 | ||
55 | DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int); | |
56 | ||
542563ba | 57 | int socket_address_parse(SocketAddress *a, const char *s) { |
42f4e3c4 | 58 | char *e, *n; |
4d49b48c | 59 | int r; |
42f4e3c4 LP |
60 | |
61 | assert(a); | |
62 | assert(s); | |
63 | ||
9152c765 | 64 | zero(*a); |
542563ba | 65 | a->type = SOCK_STREAM; |
42f4e3c4 LP |
66 | |
67 | if (*s == '[') { | |
89220e2f LP |
68 | uint16_t port; |
69 | ||
42f4e3c4 LP |
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++; | |
89220e2f | 87 | r = parse_ip_port(e, &port); |
4d49b48c | 88 | if (r < 0) |
42f4e3c4 LP |
89 | return r; |
90 | ||
42f4e3c4 | 91 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 92 | a->sockaddr.in6.sin6_port = htobe16(port); |
42f4e3c4 | 93 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
94 | |
95 | } else if (*s == '/') { | |
96 | /* AF_UNIX socket */ | |
97 | ||
98 | size_t l; | |
99 | ||
100 | l = strlen(s); | |
101 | if (l >= sizeof(a->sockaddr.un.sun_path)) | |
102 | return -EINVAL; | |
103 | ||
104 | a->sockaddr.un.sun_family = AF_UNIX; | |
105 | memcpy(a->sockaddr.un.sun_path, s, l); | |
0e098b15 | 106 | a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
42f4e3c4 | 107 | |
1c24e7bd | 108 | } else if (*s == '@') { |
42f4e3c4 LP |
109 | /* Abstract AF_UNIX socket */ |
110 | size_t l; | |
111 | ||
112 | l = strlen(s+1); | |
113 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) | |
114 | return -EINVAL; | |
115 | ||
116 | a->sockaddr.un.sun_family = AF_UNIX; | |
117 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 118 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 119 | |
0fc0f14b SH |
120 | } else if (startswith(s, "vsock:")) { |
121 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
fbd0b64f | 122 | const char *cid_start = s + STRLEN("vsock:"); |
89220e2f | 123 | unsigned port; |
0fc0f14b SH |
124 | |
125 | e = strchr(cid_start, ':'); | |
126 | if (!e) | |
127 | return -EINVAL; | |
128 | ||
89220e2f | 129 | r = safe_atou(e+1, &port); |
0fc0f14b SH |
130 | if (r < 0) |
131 | return r; | |
132 | ||
133 | n = strndupa(cid_start, e - cid_start); | |
134 | if (!isempty(n)) { | |
135 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
136 | if (r < 0) | |
137 | return r; | |
138 | } else | |
139 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
140 | ||
141 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
89220e2f | 142 | a->sockaddr.vm.svm_port = port; |
0fc0f14b SH |
143 | a->size = sizeof(struct sockaddr_vm); |
144 | ||
42f4e3c4 | 145 | } else { |
89220e2f LP |
146 | uint16_t port; |
147 | ||
4d49b48c LP |
148 | e = strchr(s, ':'); |
149 | if (e) { | |
89220e2f | 150 | r = parse_ip_port(e + 1, &port); |
4d49b48c | 151 | if (r < 0) |
542563ba LP |
152 | return r; |
153 | ||
4d49b48c | 154 | n = strndupa(s, e-s); |
42f4e3c4 | 155 | |
542563ba | 156 | /* IPv4 in w.x.y.z:p notation? */ |
4d49b48c LP |
157 | r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
158 | if (r < 0) | |
542563ba | 159 | return -errno; |
42f4e3c4 | 160 | |
542563ba LP |
161 | if (r > 0) { |
162 | /* Gotcha, it's a traditional IPv4 address */ | |
4d49b48c | 163 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 164 | a->sockaddr.in.sin_port = htobe16(port); |
542563ba LP |
165 | a->size = sizeof(struct sockaddr_in); |
166 | } else { | |
167 | unsigned idx; | |
42f4e3c4 | 168 | |
4d49b48c | 169 | if (strlen(n) > IF_NAMESIZE-1) |
acbb0225 | 170 | return -EINVAL; |
acbb0225 | 171 | |
542563ba LP |
172 | /* Uh, our last resort, an interface name */ |
173 | idx = if_nametoindex(n); | |
83c60c9f | 174 | if (idx == 0) |
542563ba | 175 | return -EINVAL; |
42f4e3c4 | 176 | |
542563ba | 177 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 178 | a->sockaddr.in6.sin6_port = htobe16(port); |
542563ba | 179 | a->sockaddr.in6.sin6_scope_id = idx; |
83c60c9f | 180 | a->sockaddr.in6.sin6_addr = in6addr_any; |
542563ba LP |
181 | a->size = sizeof(struct sockaddr_in6); |
182 | } | |
42f4e3c4 LP |
183 | } else { |
184 | ||
185 | /* Just a port */ | |
89220e2f | 186 | r = parse_ip_port(s, &port); |
5198dabc | 187 | if (r < 0) |
42f4e3c4 LP |
188 | return r; |
189 | ||
5bfcc1c6 FF |
190 | if (socket_ipv6_is_supported()) { |
191 | a->sockaddr.in6.sin6_family = AF_INET6; | |
89220e2f | 192 | a->sockaddr.in6.sin6_port = htobe16(port); |
5bfcc1c6 FF |
193 | a->sockaddr.in6.sin6_addr = in6addr_any; |
194 | a->size = sizeof(struct sockaddr_in6); | |
195 | } else { | |
4d49b48c | 196 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 197 | a->sockaddr.in.sin_port = htobe16(port); |
4d49b48c | 198 | a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
5bfcc1c6 FF |
199 | a->size = sizeof(struct sockaddr_in); |
200 | } | |
42f4e3c4 LP |
201 | } |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
7693146d LP |
207 | int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
208 | SocketAddress b; | |
209 | int r; | |
210 | ||
211 | /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ | |
212 | ||
213 | r = socket_address_parse(&b, s); | |
214 | if (r < 0) | |
215 | return r; | |
216 | ||
217 | if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { | |
218 | log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); | |
219 | return -EAFNOSUPPORT; | |
220 | } | |
221 | ||
222 | *a = b; | |
223 | return 0; | |
224 | } | |
225 | ||
7a22745a LP |
226 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
227 | int family; | |
228 | unsigned group = 0; | |
f8b69d1d | 229 | _cleanup_free_ char *sfamily = NULL; |
7a22745a LP |
230 | assert(a); |
231 | assert(s); | |
232 | ||
233 | zero(*a); | |
234 | a->type = SOCK_RAW; | |
235 | ||
236 | errno = 0; | |
237 | if (sscanf(s, "%ms %u", &sfamily, &group) < 1) | |
bcb161b0 | 238 | return errno > 0 ? -errno : -EINVAL; |
7a22745a | 239 | |
f8b69d1d MS |
240 | family = netlink_family_from_string(sfamily); |
241 | if (family < 0) | |
242 | return -EINVAL; | |
7a22745a LP |
243 | |
244 | a->sockaddr.nl.nl_family = AF_NETLINK; | |
245 | a->sockaddr.nl.nl_groups = group; | |
246 | ||
247 | a->type = SOCK_RAW; | |
248 | a->size = sizeof(struct sockaddr_nl); | |
249 | a->protocol = family; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
542563ba | 254 | int socket_address_verify(const SocketAddress *a) { |
42f4e3c4 LP |
255 | assert(a); |
256 | ||
542563ba | 257 | switch (socket_address_family(a)) { |
42f4e3c4 | 258 | |
7a22745a LP |
259 | case AF_INET: |
260 | if (a->size != sizeof(struct sockaddr_in)) | |
261 | return -EINVAL; | |
42f4e3c4 | 262 | |
4d49b48c | 263 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 264 | return -EINVAL; |
42f4e3c4 | 265 | |
ec2ce0c5 | 266 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 267 | return -EINVAL; |
42f4e3c4 | 268 | |
7a22745a LP |
269 | return 0; |
270 | ||
271 | case AF_INET6: | |
272 | if (a->size != sizeof(struct sockaddr_in6)) | |
273 | return -EINVAL; | |
42f4e3c4 | 274 | |
7a22745a LP |
275 | if (a->sockaddr.in6.sin6_port == 0) |
276 | return -EINVAL; | |
42f4e3c4 | 277 | |
ec2ce0c5 | 278 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 279 | return -EINVAL; |
42f4e3c4 | 280 | |
7a22745a | 281 | return 0; |
42f4e3c4 | 282 | |
7a22745a LP |
283 | case AF_UNIX: |
284 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
285 | return -EINVAL; | |
42f4e3c4 | 286 | |
7a22745a | 287 | if (a->size > offsetof(struct sockaddr_un, sun_path)) { |
42f4e3c4 | 288 | |
7a22745a LP |
289 | if (a->sockaddr.un.sun_path[0] != 0) { |
290 | char *e; | |
291 | ||
292 | /* path */ | |
4d49b48c LP |
293 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
294 | if (!e) | |
7a22745a LP |
295 | return -EINVAL; |
296 | ||
297 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) | |
298 | return -EINVAL; | |
42f4e3c4 | 299 | } |
7a22745a | 300 | } |
42f4e3c4 | 301 | |
ec2ce0c5 | 302 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 303 | return -EINVAL; |
42f4e3c4 | 304 | |
7a22745a LP |
305 | return 0; |
306 | ||
307 | case AF_NETLINK: | |
308 | ||
309 | if (a->size != sizeof(struct sockaddr_nl)) | |
310 | return -EINVAL; | |
311 | ||
ec2ce0c5 | 312 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
313 | return -EINVAL; |
314 | ||
315 | return 0; | |
316 | ||
0fc0f14b SH |
317 | case AF_VSOCK: |
318 | if (a->size != sizeof(struct sockaddr_vm)) | |
319 | return -EINVAL; | |
320 | ||
ec2ce0c5 | 321 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
322 | return -EINVAL; |
323 | ||
324 | return 0; | |
325 | ||
7a22745a LP |
326 | default: |
327 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
328 | } |
329 | } | |
330 | ||
4d49b48c | 331 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 332 | int r; |
4d49b48c | 333 | |
42f4e3c4 | 334 | assert(a); |
4d49b48c | 335 | assert(ret); |
42f4e3c4 | 336 | |
4d49b48c LP |
337 | r = socket_address_verify(a); |
338 | if (r < 0) | |
42f4e3c4 LP |
339 | return r; |
340 | ||
4d49b48c | 341 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 342 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 343 | |
f8b69d1d | 344 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 345 | if (r < 0) |
f8b69d1d | 346 | return r; |
4d49b48c LP |
347 | |
348 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
349 | if (r < 0) |
350 | return -ENOMEM; | |
7a22745a LP |
351 | |
352 | return 0; | |
353 | } | |
354 | ||
3b1c5241 | 355 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
356 | } |
357 | ||
4f2d528d LP |
358 | bool socket_address_can_accept(const SocketAddress *a) { |
359 | assert(a); | |
360 | ||
361 | return | |
3742095b | 362 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 363 | } |
a16e1123 LP |
364 | |
365 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
366 | assert(a); | |
367 | assert(b); | |
368 | ||
369 | /* Invalid addresses are unequal to all */ | |
370 | if (socket_address_verify(a) < 0 || | |
371 | socket_address_verify(b) < 0) | |
372 | return false; | |
373 | ||
374 | if (a->type != b->type) | |
375 | return false; | |
376 | ||
a16e1123 LP |
377 | if (socket_address_family(a) != socket_address_family(b)) |
378 | return false; | |
379 | ||
380 | switch (socket_address_family(a)) { | |
381 | ||
382 | case AF_INET: | |
4d49b48c | 383 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
384 | return false; |
385 | ||
4d49b48c | 386 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
387 | return false; |
388 | ||
389 | break; | |
390 | ||
391 | case AF_INET6: | |
392 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
393 | return false; | |
394 | ||
395 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
396 | return false; | |
397 | ||
398 | break; | |
399 | ||
400 | case AF_UNIX: | |
710708a5 MS |
401 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
402 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
403 | return false; | |
404 | ||
a16e1123 LP |
405 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
406 | return false; | |
407 | ||
408 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 409 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
410 | return false; |
411 | } else { | |
c78e47a6 MS |
412 | if (a->size != b->size) |
413 | return false; | |
414 | ||
b12c1e7c | 415 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
416 | return false; |
417 | } | |
418 | ||
419 | break; | |
420 | ||
7a22745a | 421 | case AF_NETLINK: |
7a22745a LP |
422 | if (a->protocol != b->protocol) |
423 | return false; | |
424 | ||
425 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
426 | return false; | |
427 | ||
428 | break; | |
429 | ||
0fc0f14b SH |
430 | case AF_VSOCK: |
431 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
432 | return false; | |
433 | ||
434 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
435 | return false; | |
436 | ||
437 | break; | |
438 | ||
a16e1123 LP |
439 | default: |
440 | /* Cannot compare, so we assume the addresses are different */ | |
441 | return false; | |
442 | } | |
443 | ||
444 | return true; | |
445 | } | |
446 | ||
27ca8d7a | 447 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
448 | struct SocketAddress b; |
449 | ||
450 | assert(a); | |
451 | assert(s); | |
452 | ||
453 | if (socket_address_parse(&b, s) < 0) | |
454 | return false; | |
455 | ||
27ca8d7a LP |
456 | b.type = type; |
457 | ||
a16e1123 | 458 | return socket_address_equal(a, &b); |
6e2ef85b LP |
459 | } |
460 | ||
7a22745a LP |
461 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
462 | struct SocketAddress b; | |
463 | ||
464 | assert(a); | |
465 | assert(s); | |
466 | ||
467 | if (socket_address_parse_netlink(&b, s) < 0) | |
468 | return false; | |
469 | ||
470 | return socket_address_equal(a, &b); | |
471 | } | |
472 | ||
a57f7e2c | 473 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
474 | assert(a); |
475 | ||
476 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 477 | return NULL; |
6e2ef85b LP |
478 | |
479 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 480 | return NULL; |
a16e1123 | 481 | |
a57f7e2c | 482 | return a->sockaddr.un.sun_path; |
a16e1123 | 483 | } |
c0120d99 | 484 | |
5bfcc1c6 | 485 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 486 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 487 | return false; |
f89f1e8f | 488 | |
7377964d | 489 | return true; |
5bfcc1c6 FF |
490 | } |
491 | ||
01e10de3 | 492 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
493 | SocketAddress b; |
494 | socklen_t solen; | |
01e10de3 LP |
495 | |
496 | assert(a); | |
497 | assert(fd >= 0); | |
498 | ||
dbafedac MS |
499 | b.size = sizeof(b.sockaddr); |
500 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
501 | return false; |
502 | ||
dbafedac | 503 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
504 | return false; |
505 | ||
dbafedac MS |
506 | solen = sizeof(b.type); |
507 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
508 | return false; |
509 | ||
dbafedac | 510 | if (b.type != a->type) |
01e10de3 LP |
511 | return false; |
512 | ||
513 | if (a->protocol != 0) { | |
dbafedac MS |
514 | solen = sizeof(b.protocol); |
515 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
516 | return false; |
517 | ||
dbafedac | 518 | if (b.protocol != a->protocol) |
01e10de3 LP |
519 | return false; |
520 | } | |
521 | ||
02233928 | 522 | return socket_address_equal(a, &b); |
01e10de3 LP |
523 | } |
524 | ||
f6aac5bf | 525 | int sockaddr_port(const struct sockaddr *_sa, unsigned *ret_port) { |
3b1c5241 SL |
526 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
527 | ||
f6aac5bf LP |
528 | /* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */ |
529 | ||
3b1c5241 SL |
530 | assert(sa); |
531 | ||
0fc0f14b | 532 | switch (sa->sa.sa_family) { |
f6aac5bf | 533 | |
0fc0f14b | 534 | case AF_INET: |
f6aac5bf | 535 | *ret_port = be16toh(sa->in.sin_port); |
0fc0f14b | 536 | return 0; |
3b1c5241 | 537 | |
0fc0f14b | 538 | case AF_INET6: |
f6aac5bf | 539 | *ret_port = be16toh(sa->in6.sin6_port); |
0fc0f14b SH |
540 | return 0; |
541 | ||
542 | case AF_VSOCK: | |
f6aac5bf | 543 | *ret_port = sa->vm.svm_port; |
0fc0f14b SH |
544 | return 0; |
545 | ||
546 | default: | |
547 | return -EAFNOSUPPORT; | |
548 | } | |
3b1c5241 SL |
549 | } |
550 | ||
551 | int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) { | |
4d49b48c | 552 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 553 | char *p; |
fc25ad25 | 554 | int r; |
8569a776 | 555 | |
4d49b48c LP |
556 | assert(sa); |
557 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 558 | |
4d49b48c | 559 | switch (sa->sa.sa_family) { |
8569a776 LP |
560 | |
561 | case AF_INET: { | |
562 | uint32_t a; | |
563 | ||
8e38570e | 564 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 565 | |
fc25ad25 ZJS |
566 | if (include_port) |
567 | r = asprintf(&p, | |
3b1c5241 SL |
568 | "%u.%u.%u.%u:%u", |
569 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 570 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
571 | else |
572 | r = asprintf(&p, | |
3b1c5241 | 573 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
574 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
575 | if (r < 0) | |
576 | return -ENOMEM; | |
8569a776 LP |
577 | break; |
578 | } | |
579 | ||
580 | case AF_INET6: { | |
581 | static const unsigned char ipv4_prefix[] = { | |
582 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
583 | }; | |
584 | ||
fc25ad25 ZJS |
585 | if (translate_ipv6 && |
586 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 587 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
588 | if (include_port) |
589 | r = asprintf(&p, | |
3b1c5241 SL |
590 | "%u.%u.%u.%u:%u", |
591 | a[0], a[1], a[2], a[3], | |
8e38570e | 592 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
593 | else |
594 | r = asprintf(&p, | |
3b1c5241 | 595 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
596 | a[0], a[1], a[2], a[3]); |
597 | if (r < 0) | |
598 | return -ENOMEM; | |
8569a776 LP |
599 | } else { |
600 | char a[INET6_ADDRSTRLEN]; | |
601 | ||
3b1c5241 SL |
602 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
603 | ||
604 | if (include_port) { | |
fc25ad25 | 605 | r = asprintf(&p, |
3b1c5241 SL |
606 | "[%s]:%u", |
607 | a, | |
8e38570e | 608 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 609 | if (r < 0) |
3b1c5241 SL |
610 | return -ENOMEM; |
611 | } else { | |
612 | p = strdup(a); | |
613 | if (!p) | |
614 | return -ENOMEM; | |
615 | } | |
8569a776 LP |
616 | } |
617 | ||
618 | break; | |
619 | } | |
620 | ||
4d49b48c LP |
621 | case AF_UNIX: |
622 | if (salen <= offsetof(struct sockaddr_un, sun_path)) { | |
623 | p = strdup("<unnamed>"); | |
624 | if (!p) | |
625 | return -ENOMEM; | |
8569a776 | 626 | |
4d49b48c LP |
627 | } else if (sa->un.sun_path[0] == 0) { |
628 | /* abstract */ | |
8569a776 | 629 | |
4d49b48c LP |
630 | /* FIXME: We assume we can print the |
631 | * socket path here and that it hasn't | |
632 | * more than one NUL byte. That is | |
633 | * actually an invalid assumption */ | |
634 | ||
635 | p = new(char, sizeof(sa->un.sun_path)+1); | |
636 | if (!p) | |
637 | return -ENOMEM; | |
638 | ||
639 | p[0] = '@'; | |
640 | memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1); | |
641 | p[sizeof(sa->un.sun_path)] = 0; | |
642 | ||
643 | } else { | |
644 | p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path)); | |
0810bc56 | 645 | if (!p) |
4d49b48c LP |
646 | return -ENOMEM; |
647 | } | |
8569a776 LP |
648 | |
649 | break; | |
8569a776 | 650 | |
0fc0f14b SH |
651 | case AF_VSOCK: |
652 | if (include_port) | |
653 | r = asprintf(&p, | |
654 | "vsock:%u:%u", | |
655 | sa->vm.svm_cid, | |
656 | sa->vm.svm_port); | |
657 | else | |
658 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); | |
659 | if (r < 0) | |
660 | return -ENOMEM; | |
661 | break; | |
662 | ||
8569a776 | 663 | default: |
15411c0c | 664 | return -EOPNOTSUPP; |
8569a776 LP |
665 | } |
666 | ||
4d49b48c | 667 | |
8569a776 LP |
668 | *ret = p; |
669 | return 0; | |
670 | } | |
671 | ||
366b7db4 | 672 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 673 | union sockaddr_union sa; |
b31f535c | 674 | socklen_t salen = sizeof(sa); |
eff05270 | 675 | int r; |
4d49b48c LP |
676 | |
677 | assert(fd >= 0); | |
678 | assert(ret); | |
679 | ||
4d49b48c LP |
680 | if (getpeername(fd, &sa.sa, &salen) < 0) |
681 | return -errno; | |
682 | ||
683 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 684 | struct ucred ucred = {}; |
4d49b48c LP |
685 | |
686 | /* UNIX connection sockets are anonymous, so let's use | |
687 | * PID/UID as pretty credentials instead */ | |
688 | ||
eff05270 LP |
689 | r = getpeercred(fd, &ucred); |
690 | if (r < 0) | |
691 | return r; | |
4d49b48c | 692 | |
de0671ee | 693 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
694 | return -ENOMEM; |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
700 | * if applicable, since that's nicer. */ | |
701 | ||
366b7db4 | 702 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
703 | } |
704 | ||
705 | int getsockname_pretty(int fd, char **ret) { | |
706 | union sockaddr_union sa; | |
b31f535c | 707 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
708 | |
709 | assert(fd >= 0); | |
710 | assert(ret); | |
711 | ||
4d49b48c LP |
712 | if (getsockname(fd, &sa.sa, &salen) < 0) |
713 | return -errno; | |
714 | ||
715 | /* For local sockets we do not translate IPv6 addresses back | |
716 | * to IPv6 if applicable, since this is usually used for | |
717 | * listening sockets where the difference between IPv4 and | |
718 | * IPv6 matters. */ | |
719 | ||
3b1c5241 | 720 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
721 | } |
722 | ||
b31f535c ZJS |
723 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
724 | int r; | |
725 | char host[NI_MAXHOST], *ret; | |
726 | ||
727 | assert(_ret); | |
728 | ||
6326a143 | 729 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 730 | if (r != 0) { |
b31f535c ZJS |
731 | int saved_errno = errno; |
732 | ||
3b1c5241 | 733 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 734 | if (r < 0) |
1938ac51 | 735 | return r; |
b31f535c | 736 | |
279d3c9c | 737 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
738 | } else { |
739 | ret = strdup(host); | |
740 | if (!ret) | |
1938ac51 | 741 | return -ENOMEM; |
cb651834 | 742 | } |
b31f535c ZJS |
743 | |
744 | *_ret = ret; | |
745 | return 0; | |
746 | } | |
747 | ||
bd1fe7c7 LP |
748 | int socket_address_unlink(SocketAddress *a) { |
749 | assert(a); | |
750 | ||
751 | if (socket_address_family(a) != AF_UNIX) | |
752 | return 0; | |
753 | ||
754 | if (a->sockaddr.un.sun_path[0] == 0) | |
755 | return 0; | |
756 | ||
757 | if (unlink(a->sockaddr.un.sun_path) < 0) | |
758 | return -errno; | |
759 | ||
760 | return 1; | |
761 | } | |
762 | ||
7a22745a LP |
763 | static const char* const netlink_family_table[] = { |
764 | [NETLINK_ROUTE] = "route", | |
765 | [NETLINK_FIREWALL] = "firewall", | |
766 | [NETLINK_INET_DIAG] = "inet-diag", | |
767 | [NETLINK_NFLOG] = "nflog", | |
768 | [NETLINK_XFRM] = "xfrm", | |
769 | [NETLINK_SELINUX] = "selinux", | |
770 | [NETLINK_ISCSI] = "iscsi", | |
771 | [NETLINK_AUDIT] = "audit", | |
772 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
773 | [NETLINK_CONNECTOR] = "connector", | |
774 | [NETLINK_NETFILTER] = "netfilter", | |
775 | [NETLINK_IP6_FW] = "ip6-fw", | |
776 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
777 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
778 | [NETLINK_GENERIC] = "generic", | |
779 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
780 | [NETLINK_ECRYPTFS] = "ecryptfs", |
781 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
782 | }; |
783 | ||
f8b69d1d | 784 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 785 | |
c0120d99 LP |
786 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
787 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
788 | [SOCKET_ADDRESS_BOTH] = "both", | |
789 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
790 | }; | |
791 | ||
792 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 | 793 | |
6f90844f YW |
794 | SocketAddressBindIPv6Only parse_socket_address_bind_ipv6_only_or_bool(const char *n) { |
795 | int r; | |
796 | ||
797 | r = parse_boolean(n); | |
798 | if (r > 0) | |
799 | return SOCKET_ADDRESS_IPV6_ONLY; | |
800 | if (r == 0) | |
801 | return SOCKET_ADDRESS_BOTH; | |
802 | ||
803 | return socket_address_bind_ipv6_only_from_string(n); | |
804 | } | |
805 | ||
f01e5736 LP |
806 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { |
807 | assert(a); | |
808 | assert(b); | |
809 | ||
810 | if (a->sa.sa_family != b->sa.sa_family) | |
811 | return false; | |
812 | ||
813 | if (a->sa.sa_family == AF_INET) | |
814 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
815 | ||
816 | if (a->sa.sa_family == AF_INET6) | |
817 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
818 | ||
0fc0f14b SH |
819 | if (a->sa.sa_family == AF_VSOCK) |
820 | return a->vm.svm_cid == b->vm.svm_cid; | |
821 | ||
f01e5736 LP |
822 | return false; |
823 | } | |
2583fbea LP |
824 | |
825 | int fd_inc_sndbuf(int fd, size_t n) { | |
826 | int r, value; | |
827 | socklen_t l = sizeof(value); | |
828 | ||
829 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
830 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
831 | return 0; | |
832 | ||
833 | /* If we have the privileges we will ignore the kernel limit. */ | |
834 | ||
835 | value = (int) n; | |
836 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) | |
837 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) | |
838 | return -errno; | |
839 | ||
840 | return 1; | |
841 | } | |
842 | ||
843 | int fd_inc_rcvbuf(int fd, size_t n) { | |
844 | int r, value; | |
845 | socklen_t l = sizeof(value); | |
846 | ||
847 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
848 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
849 | return 0; | |
850 | ||
851 | /* If we have the privileges we will ignore the kernel limit. */ | |
852 | ||
853 | value = (int) n; | |
854 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) | |
855 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) | |
856 | return -errno; | |
857 | return 1; | |
858 | } | |
859 | ||
860 | static const char* const ip_tos_table[] = { | |
861 | [IPTOS_LOWDELAY] = "low-delay", | |
862 | [IPTOS_THROUGHPUT] = "throughput", | |
863 | [IPTOS_RELIABILITY] = "reliability", | |
864 | [IPTOS_LOWCOST] = "low-cost", | |
865 | }; | |
866 | ||
867 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
868 | ||
ef76dff2 LP |
869 | bool ifname_valid(const char *p) { |
870 | bool numeric = true; | |
871 | ||
872 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
873 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
874 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
875 | ||
876 | if (isempty(p)) | |
877 | return false; | |
878 | ||
879 | if (strlen(p) >= IFNAMSIZ) | |
880 | return false; | |
881 | ||
49bfc877 | 882 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
883 | return false; |
884 | ||
885 | while (*p) { | |
886 | if ((unsigned char) *p >= 127U) | |
887 | return false; | |
888 | ||
889 | if ((unsigned char) *p <= 32U) | |
890 | return false; | |
891 | ||
4c701096 | 892 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
893 | return false; |
894 | ||
895 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
896 | p++; | |
897 | } | |
898 | ||
899 | if (numeric) | |
900 | return false; | |
901 | ||
902 | return true; | |
903 | } | |
904 | ||
26808948 SS |
905 | bool address_label_valid(const char *p) { |
906 | ||
907 | if (isempty(p)) | |
908 | return false; | |
909 | ||
910 | if (strlen(p) >= IFNAMSIZ) | |
911 | return false; | |
912 | ||
913 | while (*p) { | |
914 | if ((uint8_t) *p >= 127U) | |
915 | return false; | |
916 | ||
917 | if ((uint8_t) *p <= 31U) | |
918 | return false; | |
919 | p++; | |
920 | } | |
921 | ||
922 | return true; | |
923 | } | |
924 | ||
2583fbea LP |
925 | int getpeercred(int fd, struct ucred *ucred) { |
926 | socklen_t n = sizeof(struct ucred); | |
927 | struct ucred u; | |
928 | int r; | |
929 | ||
930 | assert(fd >= 0); | |
931 | assert(ucred); | |
932 | ||
933 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
934 | if (r < 0) | |
935 | return -errno; | |
936 | ||
937 | if (n != sizeof(struct ucred)) | |
938 | return -EIO; | |
939 | ||
bbcc701e LP |
940 | /* Check if the data is actually useful and not suppressed due to namespacing issues */ |
941 | if (!pid_is_valid(u.pid)) | |
2583fbea LP |
942 | return -ENODATA; |
943 | ||
bbcc701e LP |
944 | /* Note that we don't check UID/GID here, as namespace translation works differently there: instead of |
945 | * receiving in "invalid" user/group we get the overflow UID/GID. */ | |
946 | ||
2583fbea LP |
947 | *ucred = u; |
948 | return 0; | |
949 | } | |
950 | ||
951 | int getpeersec(int fd, char **ret) { | |
217d8967 | 952 | _cleanup_free_ char *s = NULL; |
2583fbea | 953 | socklen_t n = 64; |
2583fbea LP |
954 | |
955 | assert(fd >= 0); | |
956 | assert(ret); | |
957 | ||
217d8967 LP |
958 | for (;;) { |
959 | s = new0(char, n+1); | |
960 | if (!s) | |
961 | return -ENOMEM; | |
2583fbea | 962 | |
217d8967 LP |
963 | if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0) |
964 | break; | |
2583fbea LP |
965 | |
966 | if (errno != ERANGE) | |
967 | return -errno; | |
968 | ||
217d8967 | 969 | s = mfree(s); |
2583fbea LP |
970 | } |
971 | ||
217d8967 | 972 | if (isempty(s)) |
2583fbea | 973 | return -EOPNOTSUPP; |
2583fbea | 974 | |
ae2a15bc | 975 | *ret = TAKE_PTR(s); |
217d8967 | 976 | |
2583fbea LP |
977 | return 0; |
978 | } | |
979 | ||
43f2c88d LP |
980 | int getpeergroups(int fd, gid_t **ret) { |
981 | socklen_t n = sizeof(gid_t) * 64; | |
982 | _cleanup_free_ gid_t *d = NULL; | |
983 | ||
75f40779 | 984 | assert(fd >= 0); |
43f2c88d LP |
985 | assert(ret); |
986 | ||
987 | for (;;) { | |
988 | d = malloc(n); | |
989 | if (!d) | |
990 | return -ENOMEM; | |
991 | ||
992 | if (getsockopt(fd, SOL_SOCKET, SO_PEERGROUPS, d, &n) >= 0) | |
993 | break; | |
994 | ||
995 | if (errno != ERANGE) | |
996 | return -errno; | |
997 | ||
998 | d = mfree(d); | |
999 | } | |
1000 | ||
1001 | assert_se(n % sizeof(gid_t) == 0); | |
1002 | n /= sizeof(gid_t); | |
1003 | ||
1004 | if ((socklen_t) (int) n != n) | |
1005 | return -E2BIG; | |
1006 | ||
1cc6c93a | 1007 | *ret = TAKE_PTR(d); |
43f2c88d LP |
1008 | |
1009 | return (int) n; | |
1010 | } | |
1011 | ||
726f4c47 ZJS |
1012 | int send_one_fd_sa( |
1013 | int transport_fd, | |
1014 | int fd, | |
1015 | const struct sockaddr *sa, socklen_t len, | |
1016 | int flags) { | |
1017 | ||
2583fbea LP |
1018 | union { |
1019 | struct cmsghdr cmsghdr; | |
1020 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1021 | } control = {}; | |
1022 | struct msghdr mh = { | |
726f4c47 ZJS |
1023 | .msg_name = (struct sockaddr*) sa, |
1024 | .msg_namelen = len, | |
2583fbea LP |
1025 | .msg_control = &control, |
1026 | .msg_controllen = sizeof(control), | |
1027 | }; | |
3c171f0b | 1028 | struct cmsghdr *cmsg; |
2583fbea LP |
1029 | |
1030 | assert(transport_fd >= 0); | |
1031 | assert(fd >= 0); | |
1032 | ||
1033 | cmsg = CMSG_FIRSTHDR(&mh); | |
1034 | cmsg->cmsg_level = SOL_SOCKET; | |
1035 | cmsg->cmsg_type = SCM_RIGHTS; | |
1036 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1037 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1038 | ||
1039 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1040 | if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0) | |
1041 | return -errno; | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | int receive_one_fd(int transport_fd, int flags) { | |
1047 | union { | |
1048 | struct cmsghdr cmsghdr; | |
1049 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1050 | } control = {}; | |
1051 | struct msghdr mh = { | |
1052 | .msg_control = &control, | |
1053 | .msg_controllen = sizeof(control), | |
1054 | }; | |
1055 | struct cmsghdr *cmsg, *found = NULL; | |
1056 | ||
1057 | assert(transport_fd >= 0); | |
1058 | ||
1059 | /* | |
1060 | * Receive a single FD via @transport_fd. We don't care for | |
1061 | * the transport-type. We retrieve a single FD at most, so for | |
1062 | * packet-based transports, the caller must ensure to send | |
1063 | * only a single FD per packet. This is best used in | |
1064 | * combination with send_one_fd(). | |
1065 | */ | |
1066 | ||
1067 | if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0) | |
1068 | return -errno; | |
1069 | ||
1070 | CMSG_FOREACH(cmsg, &mh) { | |
1071 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1072 | cmsg->cmsg_type == SCM_RIGHTS && | |
1073 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1074 | assert(!found); | |
1075 | found = cmsg; | |
1076 | break; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | if (!found) { | |
1081 | cmsg_close_all(&mh); | |
1082 | return -EIO; | |
1083 | } | |
1084 | ||
1085 | return *(int*) CMSG_DATA(found); | |
1086 | } | |
4edc2c9b LP |
1087 | |
1088 | ssize_t next_datagram_size_fd(int fd) { | |
1089 | ssize_t l; | |
1090 | int k; | |
1091 | ||
1092 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1093 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1094 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1095 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1096 | * the wrong size. */ | |
1097 | ||
1098 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1099 | if (l < 0) { | |
3742095b | 1100 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1101 | goto fallback; |
1102 | ||
1103 | return -errno; | |
1104 | } | |
1105 | if (l == 0) | |
1106 | goto fallback; | |
1107 | ||
1108 | return l; | |
1109 | ||
1110 | fallback: | |
1111 | k = 0; | |
1112 | ||
1113 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1114 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1115 | ||
1116 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1117 | return -errno; | |
1118 | ||
1119 | return (ssize_t) k; | |
1120 | } | |
60d9771c LP |
1121 | |
1122 | int flush_accept(int fd) { | |
1123 | ||
1124 | struct pollfd pollfd = { | |
1125 | .fd = fd, | |
1126 | .events = POLLIN, | |
1127 | }; | |
1128 | int r; | |
1129 | ||
1130 | ||
1131 | /* Similar to flush_fd() but flushes all incoming connection by accepting them and immediately closing them. */ | |
1132 | ||
1133 | for (;;) { | |
1134 | int cfd; | |
1135 | ||
1136 | r = poll(&pollfd, 1, 0); | |
1137 | if (r < 0) { | |
1138 | if (errno == EINTR) | |
1139 | continue; | |
1140 | ||
1141 | return -errno; | |
1142 | ||
1143 | } else if (r == 0) | |
1144 | return 0; | |
1145 | ||
1146 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
1147 | if (cfd < 0) { | |
1148 | if (errno == EINTR) | |
1149 | continue; | |
1150 | ||
1151 | if (errno == EAGAIN) | |
1152 | return 0; | |
1153 | ||
1154 | return -errno; | |
1155 | } | |
1156 | ||
1157 | close(cfd); | |
1158 | } | |
1159 | } | |
29206d46 LP |
1160 | |
1161 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1162 | struct cmsghdr *cmsg; | |
1163 | ||
1164 | assert(mh); | |
1165 | ||
1166 | CMSG_FOREACH(cmsg, mh) | |
1167 | if (cmsg->cmsg_level == level && | |
1168 | cmsg->cmsg_type == type && | |
1169 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1170 | return cmsg; | |
1171 | ||
1172 | return NULL; | |
1173 | } | |
429b4350 LP |
1174 | |
1175 | int socket_ioctl_fd(void) { | |
1176 | int fd; | |
1177 | ||
1178 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1179 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1180 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1181 | * generic AF_NETLINK. */ | |
1182 | ||
1183 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1184 | if (fd < 0) | |
1185 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1186 | if (fd < 0) | |
1187 | return -errno; | |
1188 | ||
1189 | return fd; | |
1190 | } |