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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7334b09 | 2 | |
42f4e3c4 | 3 | #include <arpa/inet.h> |
07630cea | 4 | #include <errno.h> |
11c3a366 | 5 | #include <limits.h> |
542563ba | 6 | #include <net/if.h> |
b31f535c | 7 | #include <netdb.h> |
2583fbea | 8 | #include <netinet/ip.h> |
60d9771c | 9 | #include <poll.h> |
07630cea | 10 | #include <stddef.h> |
11c3a366 | 11 | #include <stdint.h> |
07630cea | 12 | #include <stdio.h> |
11c3a366 | 13 | #include <stdlib.h> |
f5947a5e | 14 | #include <sys/ioctl.h> |
07630cea | 15 | #include <unistd.h> |
42f4e3c4 | 16 | |
b5efdb8a | 17 | #include "alloc-util.h" |
4ff9bc2e | 18 | #include "errno-util.h" |
15dca371 | 19 | #include "escape.h" |
2583fbea | 20 | #include "fd-util.h" |
07630cea | 21 | #include "fileio.h" |
f97b34a6 | 22 | #include "format-util.h" |
93cc7779 | 23 | #include "log.h" |
42f4e3c4 | 24 | #include "macro.h" |
0a970718 | 25 | #include "memory-util.h" |
f5947a5e | 26 | #include "missing_socket.h" |
6bedfcbb | 27 | #include "parse-util.h" |
9eb977db | 28 | #include "path-util.h" |
dccca82b | 29 | #include "process-util.h" |
2583fbea | 30 | #include "socket-util.h" |
8b43440b | 31 | #include "string-table.h" |
07630cea | 32 | #include "string-util.h" |
ef76dff2 | 33 | #include "strv.h" |
ee104e11 | 34 | #include "user-util.h" |
ef76dff2 | 35 | #include "utf8.h" |
42f4e3c4 | 36 | |
349cc4a5 | 37 | #if ENABLE_IDN |
cadc80b8 | 38 | # define IDN_FLAGS NI_IDN |
6326a143 WB |
39 | #else |
40 | # define IDN_FLAGS 0 | |
41 | #endif | |
42 | ||
398ce0bc YW |
43 | static const char* const socket_address_type_table[] = { |
44 | [SOCK_STREAM] = "Stream", | |
45 | [SOCK_DGRAM] = "Datagram", | |
46 | [SOCK_RAW] = "Raw", | |
47 | [SOCK_RDM] = "ReliableDatagram", | |
48 | [SOCK_SEQPACKET] = "SequentialPacket", | |
49 | [SOCK_DCCP] = "DatagramCongestionControl", | |
50 | }; | |
51 | ||
52 | DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int); | |
53 | ||
542563ba | 54 | int socket_address_parse(SocketAddress *a, const char *s) { |
8d30fcb9 YW |
55 | _cleanup_free_ char *n = NULL; |
56 | char *e; | |
4d49b48c | 57 | int r; |
42f4e3c4 LP |
58 | |
59 | assert(a); | |
60 | assert(s); | |
61 | ||
9ec30b27 LP |
62 | *a = (SocketAddress) { |
63 | .type = SOCK_STREAM, | |
64 | }; | |
42f4e3c4 LP |
65 | |
66 | if (*s == '[') { | |
89220e2f LP |
67 | uint16_t port; |
68 | ||
42f4e3c4 LP |
69 | /* IPv6 in [x:.....:z]:p notation */ |
70 | ||
4d49b48c LP |
71 | e = strchr(s+1, ']'); |
72 | if (!e) | |
42f4e3c4 LP |
73 | return -EINVAL; |
74 | ||
8d30fcb9 YW |
75 | n = strndup(s+1, e-s-1); |
76 | if (!n) | |
77 | return -ENOMEM; | |
42f4e3c4 LP |
78 | |
79 | errno = 0; | |
4d49b48c | 80 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
66855de7 | 81 | return errno_or_else(EINVAL); |
42f4e3c4 LP |
82 | |
83 | e++; | |
84 | if (*e != ':') | |
85 | return -EINVAL; | |
86 | ||
87 | e++; | |
89220e2f | 88 | r = parse_ip_port(e, &port); |
4d49b48c | 89 | if (r < 0) |
42f4e3c4 LP |
90 | return r; |
91 | ||
42f4e3c4 | 92 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 93 | a->sockaddr.in6.sin6_port = htobe16(port); |
42f4e3c4 | 94 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
95 | |
96 | } else if (*s == '/') { | |
97 | /* AF_UNIX socket */ | |
98 | ||
99 | size_t l; | |
100 | ||
101 | l = strlen(s); | |
057e8580 LP |
102 | if (l >= sizeof(a->sockaddr.un.sun_path)) /* Note that we refuse non-NUL-terminated sockets when |
103 | * parsing (the kernel itself is less strict here in what it | |
104 | * accepts) */ | |
42f4e3c4 LP |
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); | |
15dca371 | 116 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) /* Note that we refuse non-NUL-terminated sockets here |
057e8580 LP |
117 | * when parsing, even though abstract namespace sockets |
118 | * explicitly allow embedded NUL bytes and don't consider | |
119 | * them special. But it's simply annoying to debug such | |
120 | * sockets. */ | |
42f4e3c4 LP |
121 | return -EINVAL; |
122 | ||
123 | a->sockaddr.un.sun_family = AF_UNIX; | |
124 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 125 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 126 | |
0fc0f14b SH |
127 | } else if (startswith(s, "vsock:")) { |
128 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
fbd0b64f | 129 | const char *cid_start = s + STRLEN("vsock:"); |
89220e2f | 130 | unsigned port; |
0fc0f14b SH |
131 | |
132 | e = strchr(cid_start, ':'); | |
133 | if (!e) | |
134 | return -EINVAL; | |
135 | ||
89220e2f | 136 | r = safe_atou(e+1, &port); |
0fc0f14b SH |
137 | if (r < 0) |
138 | return r; | |
139 | ||
8d30fcb9 YW |
140 | n = strndup(cid_start, e - cid_start); |
141 | if (!n) | |
142 | return -ENOMEM; | |
143 | ||
0fc0f14b SH |
144 | if (!isempty(n)) { |
145 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
146 | if (r < 0) | |
147 | return r; | |
148 | } else | |
149 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
150 | ||
151 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
89220e2f | 152 | a->sockaddr.vm.svm_port = port; |
0fc0f14b SH |
153 | a->size = sizeof(struct sockaddr_vm); |
154 | ||
42f4e3c4 | 155 | } else { |
89220e2f LP |
156 | uint16_t port; |
157 | ||
4d49b48c LP |
158 | e = strchr(s, ':'); |
159 | if (e) { | |
89220e2f | 160 | r = parse_ip_port(e + 1, &port); |
4d49b48c | 161 | if (r < 0) |
542563ba LP |
162 | return r; |
163 | ||
8d30fcb9 YW |
164 | n = strndup(s, e-s); |
165 | if (!n) | |
166 | return -ENOMEM; | |
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 | 238 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
528a74a1 | 239 | _cleanup_free_ char *word = NULL; |
7a22745a | 240 | unsigned group = 0; |
528a74a1 YW |
241 | int family, r; |
242 | ||
7a22745a LP |
243 | assert(a); |
244 | assert(s); | |
245 | ||
246 | zero(*a); | |
247 | a->type = SOCK_RAW; | |
248 | ||
528a74a1 YW |
249 | r = extract_first_word(&s, &word, NULL, 0); |
250 | if (r < 0) | |
251 | return r; | |
252 | if (r == 0) | |
253 | return -EINVAL; | |
7a22745a | 254 | |
528a74a1 | 255 | family = netlink_family_from_string(word); |
f8b69d1d MS |
256 | if (family < 0) |
257 | return -EINVAL; | |
7a22745a | 258 | |
528a74a1 YW |
259 | if (!isempty(s)) { |
260 | r = safe_atou(s, &group); | |
261 | if (r < 0) | |
262 | return r; | |
263 | } | |
264 | ||
7a22745a LP |
265 | a->sockaddr.nl.nl_family = AF_NETLINK; |
266 | a->sockaddr.nl.nl_groups = group; | |
267 | ||
268 | a->type = SOCK_RAW; | |
269 | a->size = sizeof(struct sockaddr_nl); | |
270 | a->protocol = family; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
15dca371 | 275 | int socket_address_verify(const SocketAddress *a, bool strict) { |
42f4e3c4 LP |
276 | assert(a); |
277 | ||
15dca371 ZJS |
278 | /* With 'strict' we enforce additional sanity constraints which are not set by the standard, |
279 | * but should only apply to sockets we create ourselves. */ | |
280 | ||
542563ba | 281 | switch (socket_address_family(a)) { |
42f4e3c4 | 282 | |
7a22745a LP |
283 | case AF_INET: |
284 | if (a->size != sizeof(struct sockaddr_in)) | |
285 | return -EINVAL; | |
42f4e3c4 | 286 | |
4d49b48c | 287 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 288 | return -EINVAL; |
42f4e3c4 | 289 | |
ec2ce0c5 | 290 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 291 | return -EINVAL; |
42f4e3c4 | 292 | |
7a22745a LP |
293 | return 0; |
294 | ||
295 | case AF_INET6: | |
296 | if (a->size != sizeof(struct sockaddr_in6)) | |
297 | return -EINVAL; | |
42f4e3c4 | 298 | |
7a22745a LP |
299 | if (a->sockaddr.in6.sin6_port == 0) |
300 | return -EINVAL; | |
42f4e3c4 | 301 | |
ec2ce0c5 | 302 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 303 | return -EINVAL; |
42f4e3c4 | 304 | |
7a22745a | 305 | return 0; |
42f4e3c4 | 306 | |
7a22745a LP |
307 | case AF_UNIX: |
308 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
309 | return -EINVAL; | |
15dca371 ZJS |
310 | if (a->size > sizeof(struct sockaddr_un) + !strict) |
311 | /* If !strict, allow one extra byte, since getsockname() on Linux will append | |
312 | * a NUL byte if we have path sockets that are above sun_path's full size. */ | |
8e8132c6 | 313 | return -EINVAL; |
42f4e3c4 | 314 | |
8e8132c6 | 315 | if (a->size > offsetof(struct sockaddr_un, sun_path) && |
15dca371 ZJS |
316 | a->sockaddr.un.sun_path[0] != 0 && |
317 | strict) { | |
318 | /* Only validate file system sockets here, and only in strict mode */ | |
8e8132c6 | 319 | const char *e; |
7a22745a | 320 | |
8e8132c6 LP |
321 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
322 | if (e) { | |
15dca371 | 323 | /* If there's an embedded NUL byte, make sure the size of the socket address matches it */ |
7a22745a LP |
324 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) |
325 | return -EINVAL; | |
8e8132c6 LP |
326 | } else { |
327 | /* If there's no embedded NUL byte, then then the size needs to match the whole | |
328 | * structure or the structure with one extra NUL byte suffixed. (Yeah, Linux is awful, | |
329 | * and considers both equivalent: getsockname() even extends sockaddr_un beyond its | |
330 | * size if the path is non NUL terminated.)*/ | |
331 | if (!IN_SET(a->size, sizeof(a->sockaddr.un.sun_path), sizeof(a->sockaddr.un.sun_path)+1)) | |
332 | return -EINVAL; | |
42f4e3c4 | 333 | } |
7a22745a | 334 | } |
42f4e3c4 | 335 | |
ec2ce0c5 | 336 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 337 | return -EINVAL; |
42f4e3c4 | 338 | |
7a22745a LP |
339 | return 0; |
340 | ||
341 | case AF_NETLINK: | |
342 | ||
343 | if (a->size != sizeof(struct sockaddr_nl)) | |
344 | return -EINVAL; | |
345 | ||
ec2ce0c5 | 346 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
347 | return -EINVAL; |
348 | ||
349 | return 0; | |
350 | ||
0fc0f14b SH |
351 | case AF_VSOCK: |
352 | if (a->size != sizeof(struct sockaddr_vm)) | |
353 | return -EINVAL; | |
354 | ||
ec2ce0c5 | 355 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
356 | return -EINVAL; |
357 | ||
358 | return 0; | |
359 | ||
7a22745a LP |
360 | default: |
361 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
362 | } |
363 | } | |
364 | ||
4d49b48c | 365 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 366 | int r; |
4d49b48c | 367 | |
42f4e3c4 | 368 | assert(a); |
4d49b48c | 369 | assert(ret); |
42f4e3c4 | 370 | |
15dca371 ZJS |
371 | r = socket_address_verify(a, false); /* We do non-strict validation, because we want to be |
372 | * able to pretty-print any socket the kernel considers | |
373 | * valid. We still need to do validation to know if we | |
374 | * can meaningfully print the address. */ | |
4d49b48c | 375 | if (r < 0) |
42f4e3c4 LP |
376 | return r; |
377 | ||
4d49b48c | 378 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 379 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 380 | |
f8b69d1d | 381 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 382 | if (r < 0) |
f8b69d1d | 383 | return r; |
4d49b48c LP |
384 | |
385 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
386 | if (r < 0) |
387 | return -ENOMEM; | |
7a22745a LP |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
3b1c5241 | 392 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
393 | } |
394 | ||
4f2d528d LP |
395 | bool socket_address_can_accept(const SocketAddress *a) { |
396 | assert(a); | |
397 | ||
398 | return | |
3742095b | 399 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 400 | } |
a16e1123 LP |
401 | |
402 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
403 | assert(a); | |
404 | assert(b); | |
405 | ||
406 | /* Invalid addresses are unequal to all */ | |
15dca371 ZJS |
407 | if (socket_address_verify(a, false) < 0 || |
408 | socket_address_verify(b, false) < 0) | |
a16e1123 LP |
409 | return false; |
410 | ||
411 | if (a->type != b->type) | |
412 | return false; | |
413 | ||
a16e1123 LP |
414 | if (socket_address_family(a) != socket_address_family(b)) |
415 | return false; | |
416 | ||
417 | switch (socket_address_family(a)) { | |
418 | ||
419 | case AF_INET: | |
4d49b48c | 420 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
421 | return false; |
422 | ||
4d49b48c | 423 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
424 | return false; |
425 | ||
426 | break; | |
427 | ||
428 | case AF_INET6: | |
429 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
430 | return false; | |
431 | ||
432 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
433 | return false; | |
434 | ||
435 | break; | |
436 | ||
437 | case AF_UNIX: | |
710708a5 MS |
438 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
439 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
440 | return false; | |
441 | ||
a16e1123 LP |
442 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
443 | return false; | |
444 | ||
445 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 446 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
447 | return false; |
448 | } else { | |
c78e47a6 MS |
449 | if (a->size != b->size) |
450 | return false; | |
451 | ||
b12c1e7c | 452 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
453 | return false; |
454 | } | |
455 | ||
456 | break; | |
457 | ||
7a22745a | 458 | case AF_NETLINK: |
7a22745a LP |
459 | if (a->protocol != b->protocol) |
460 | return false; | |
461 | ||
462 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
463 | return false; | |
464 | ||
465 | break; | |
466 | ||
0fc0f14b SH |
467 | case AF_VSOCK: |
468 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
469 | return false; | |
470 | ||
471 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
472 | return false; | |
473 | ||
474 | break; | |
475 | ||
a16e1123 LP |
476 | default: |
477 | /* Cannot compare, so we assume the addresses are different */ | |
478 | return false; | |
479 | } | |
480 | ||
481 | return true; | |
482 | } | |
483 | ||
27ca8d7a | 484 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
485 | struct SocketAddress b; |
486 | ||
487 | assert(a); | |
488 | assert(s); | |
489 | ||
490 | if (socket_address_parse(&b, s) < 0) | |
491 | return false; | |
492 | ||
27ca8d7a LP |
493 | b.type = type; |
494 | ||
a16e1123 | 495 | return socket_address_equal(a, &b); |
6e2ef85b LP |
496 | } |
497 | ||
7a22745a LP |
498 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
499 | struct SocketAddress b; | |
500 | ||
501 | assert(a); | |
502 | assert(s); | |
503 | ||
504 | if (socket_address_parse_netlink(&b, s) < 0) | |
505 | return false; | |
506 | ||
507 | return socket_address_equal(a, &b); | |
508 | } | |
509 | ||
a57f7e2c | 510 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
511 | assert(a); |
512 | ||
513 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 514 | return NULL; |
6e2ef85b LP |
515 | |
516 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 517 | return NULL; |
a16e1123 | 518 | |
48e6a2dc LP |
519 | /* Note that this is only safe because we know that there's an extra NUL byte after the sockaddr_un |
520 | * structure. On Linux AF_UNIX file system socket addresses don't have to be NUL terminated if they take up the | |
521 | * full sun_path space. */ | |
522 | assert_cc(sizeof(union sockaddr_union) >= sizeof(struct sockaddr_un)+1); | |
a57f7e2c | 523 | return a->sockaddr.un.sun_path; |
a16e1123 | 524 | } |
c0120d99 | 525 | |
5bfcc1c6 | 526 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 527 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 528 | return false; |
f89f1e8f | 529 | |
7377964d | 530 | return true; |
5bfcc1c6 FF |
531 | } |
532 | ||
01e10de3 | 533 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
534 | SocketAddress b; |
535 | socklen_t solen; | |
01e10de3 LP |
536 | |
537 | assert(a); | |
538 | assert(fd >= 0); | |
539 | ||
dbafedac MS |
540 | b.size = sizeof(b.sockaddr); |
541 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
542 | return false; |
543 | ||
dbafedac | 544 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
545 | return false; |
546 | ||
dbafedac MS |
547 | solen = sizeof(b.type); |
548 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
549 | return false; |
550 | ||
dbafedac | 551 | if (b.type != a->type) |
01e10de3 LP |
552 | return false; |
553 | ||
554 | if (a->protocol != 0) { | |
dbafedac MS |
555 | solen = sizeof(b.protocol); |
556 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
557 | return false; |
558 | ||
dbafedac | 559 | if (b.protocol != a->protocol) |
01e10de3 LP |
560 | return false; |
561 | } | |
562 | ||
02233928 | 563 | return socket_address_equal(a, &b); |
01e10de3 LP |
564 | } |
565 | ||
f6aac5bf | 566 | int sockaddr_port(const struct sockaddr *_sa, unsigned *ret_port) { |
3b1c5241 SL |
567 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
568 | ||
f6aac5bf LP |
569 | /* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */ |
570 | ||
3b1c5241 SL |
571 | assert(sa); |
572 | ||
0fc0f14b | 573 | switch (sa->sa.sa_family) { |
f6aac5bf | 574 | |
0fc0f14b | 575 | case AF_INET: |
f6aac5bf | 576 | *ret_port = be16toh(sa->in.sin_port); |
0fc0f14b | 577 | return 0; |
3b1c5241 | 578 | |
0fc0f14b | 579 | case AF_INET6: |
f6aac5bf | 580 | *ret_port = be16toh(sa->in6.sin6_port); |
0fc0f14b SH |
581 | return 0; |
582 | ||
583 | case AF_VSOCK: | |
f6aac5bf | 584 | *ret_port = sa->vm.svm_port; |
0fc0f14b SH |
585 | return 0; |
586 | ||
587 | default: | |
588 | return -EAFNOSUPPORT; | |
589 | } | |
3b1c5241 SL |
590 | } |
591 | ||
836f9cfe LP |
592 | int sockaddr_pretty( |
593 | const struct sockaddr *_sa, | |
594 | socklen_t salen, | |
595 | bool translate_ipv6, | |
596 | bool include_port, | |
597 | char **ret) { | |
598 | ||
4d49b48c | 599 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 600 | char *p; |
fc25ad25 | 601 | int r; |
8569a776 | 602 | |
4d49b48c LP |
603 | assert(sa); |
604 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 605 | |
4d49b48c | 606 | switch (sa->sa.sa_family) { |
8569a776 LP |
607 | |
608 | case AF_INET: { | |
609 | uint32_t a; | |
610 | ||
8e38570e | 611 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 612 | |
fc25ad25 ZJS |
613 | if (include_port) |
614 | r = asprintf(&p, | |
3b1c5241 SL |
615 | "%u.%u.%u.%u:%u", |
616 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 617 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
618 | else |
619 | r = asprintf(&p, | |
3b1c5241 | 620 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
621 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
622 | if (r < 0) | |
623 | return -ENOMEM; | |
8569a776 LP |
624 | break; |
625 | } | |
626 | ||
627 | case AF_INET6: { | |
628 | static const unsigned char ipv4_prefix[] = { | |
629 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
630 | }; | |
631 | ||
fc25ad25 ZJS |
632 | if (translate_ipv6 && |
633 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 634 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
635 | if (include_port) |
636 | r = asprintf(&p, | |
3b1c5241 SL |
637 | "%u.%u.%u.%u:%u", |
638 | a[0], a[1], a[2], a[3], | |
8e38570e | 639 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
640 | else |
641 | r = asprintf(&p, | |
3b1c5241 | 642 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
643 | a[0], a[1], a[2], a[3]); |
644 | if (r < 0) | |
645 | return -ENOMEM; | |
8569a776 LP |
646 | } else { |
647 | char a[INET6_ADDRSTRLEN]; | |
648 | ||
3b1c5241 SL |
649 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
650 | ||
651 | if (include_port) { | |
fc25ad25 | 652 | r = asprintf(&p, |
3b1c5241 SL |
653 | "[%s]:%u", |
654 | a, | |
8e38570e | 655 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 656 | if (r < 0) |
3b1c5241 SL |
657 | return -ENOMEM; |
658 | } else { | |
659 | p = strdup(a); | |
660 | if (!p) | |
661 | return -ENOMEM; | |
662 | } | |
8569a776 LP |
663 | } |
664 | ||
665 | break; | |
666 | } | |
667 | ||
4d49b48c | 668 | case AF_UNIX: |
15dca371 | 669 | if (salen <= offsetof(struct sockaddr_un, sun_path) || |
994b9d4e | 670 | (sa->un.sun_path[0] == 0 && salen == offsetof(struct sockaddr_un, sun_path) + 1)) |
15dca371 | 671 | /* The name must have at least one character (and the leading NUL does not count) */ |
4d49b48c | 672 | p = strdup("<unnamed>"); |
994b9d4e | 673 | else { |
085b39e9 LP |
674 | /* Note that we calculate the path pointer here through the .un_buffer[] field, in order to |
675 | * outtrick bounds checking tools such as ubsan, which are too smart for their own good: on | |
676 | * Linux the kernel may return sun_path[] data one byte longer than the declared size of the | |
677 | * field. */ | |
678 | char *path = (char*) sa->un_buffer + offsetof(struct sockaddr_un, sun_path); | |
15dca371 | 679 | size_t path_len = salen - offsetof(struct sockaddr_un, sun_path); |
8569a776 | 680 | |
085b39e9 | 681 | if (path[0] == 0) { |
15dca371 ZJS |
682 | /* Abstract socket. When parsing address information from, we |
683 | * explicitly reject overly long paths and paths with embedded NULs. | |
684 | * But we might get such a socket from the outside. Let's return | |
685 | * something meaningful and printable in this case. */ | |
4d49b48c | 686 | |
15dca371 | 687 | _cleanup_free_ char *e = NULL; |
4d49b48c | 688 | |
085b39e9 | 689 | e = cescape_length(path + 1, path_len - 1); |
15dca371 ZJS |
690 | if (!e) |
691 | return -ENOMEM; | |
4d49b48c | 692 | |
15dca371 ZJS |
693 | p = strjoin("@", e); |
694 | } else { | |
085b39e9 | 695 | if (path[path_len - 1] == '\0') |
15dca371 ZJS |
696 | /* We expect a terminating NUL and don't print it */ |
697 | path_len --; | |
698 | ||
085b39e9 | 699 | p = cescape_length(path, path_len); |
15dca371 | 700 | } |
4d49b48c | 701 | } |
994b9d4e LP |
702 | if (!p) |
703 | return -ENOMEM; | |
8569a776 LP |
704 | |
705 | break; | |
8569a776 | 706 | |
0fc0f14b | 707 | case AF_VSOCK: |
3a484991 ZJS |
708 | if (include_port) { |
709 | if (sa->vm.svm_cid == VMADDR_CID_ANY) | |
710 | r = asprintf(&p, "vsock::%u", sa->vm.svm_port); | |
711 | else | |
712 | r = asprintf(&p, "vsock:%u:%u", sa->vm.svm_cid, sa->vm.svm_port); | |
713 | } else | |
0fc0f14b SH |
714 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); |
715 | if (r < 0) | |
716 | return -ENOMEM; | |
717 | break; | |
718 | ||
8569a776 | 719 | default: |
15411c0c | 720 | return -EOPNOTSUPP; |
8569a776 LP |
721 | } |
722 | ||
723 | *ret = p; | |
724 | return 0; | |
725 | } | |
726 | ||
366b7db4 | 727 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 728 | union sockaddr_union sa; |
b31f535c | 729 | socklen_t salen = sizeof(sa); |
eff05270 | 730 | int r; |
4d49b48c LP |
731 | |
732 | assert(fd >= 0); | |
733 | assert(ret); | |
734 | ||
4d49b48c LP |
735 | if (getpeername(fd, &sa.sa, &salen) < 0) |
736 | return -errno; | |
737 | ||
738 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 739 | struct ucred ucred = {}; |
4d49b48c LP |
740 | |
741 | /* UNIX connection sockets are anonymous, so let's use | |
742 | * PID/UID as pretty credentials instead */ | |
743 | ||
eff05270 LP |
744 | r = getpeercred(fd, &ucred); |
745 | if (r < 0) | |
746 | return r; | |
4d49b48c | 747 | |
de0671ee | 748 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
749 | return -ENOMEM; |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
755 | * if applicable, since that's nicer. */ | |
756 | ||
366b7db4 | 757 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
758 | } |
759 | ||
760 | int getsockname_pretty(int fd, char **ret) { | |
761 | union sockaddr_union sa; | |
b31f535c | 762 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
763 | |
764 | assert(fd >= 0); | |
765 | assert(ret); | |
766 | ||
4d49b48c LP |
767 | if (getsockname(fd, &sa.sa, &salen) < 0) |
768 | return -errno; | |
769 | ||
770 | /* For local sockets we do not translate IPv6 addresses back | |
771 | * to IPv6 if applicable, since this is usually used for | |
772 | * listening sockets where the difference between IPv4 and | |
773 | * IPv6 matters. */ | |
774 | ||
3b1c5241 | 775 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
776 | } |
777 | ||
b31f535c ZJS |
778 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
779 | int r; | |
780 | char host[NI_MAXHOST], *ret; | |
781 | ||
782 | assert(_ret); | |
783 | ||
6326a143 | 784 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 785 | if (r != 0) { |
b31f535c ZJS |
786 | int saved_errno = errno; |
787 | ||
3b1c5241 | 788 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 789 | if (r < 0) |
1938ac51 | 790 | return r; |
b31f535c | 791 | |
279d3c9c | 792 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
793 | } else { |
794 | ret = strdup(host); | |
795 | if (!ret) | |
1938ac51 | 796 | return -ENOMEM; |
cb651834 | 797 | } |
b31f535c ZJS |
798 | |
799 | *_ret = ret; | |
800 | return 0; | |
801 | } | |
802 | ||
7a22745a LP |
803 | static const char* const netlink_family_table[] = { |
804 | [NETLINK_ROUTE] = "route", | |
805 | [NETLINK_FIREWALL] = "firewall", | |
806 | [NETLINK_INET_DIAG] = "inet-diag", | |
807 | [NETLINK_NFLOG] = "nflog", | |
808 | [NETLINK_XFRM] = "xfrm", | |
809 | [NETLINK_SELINUX] = "selinux", | |
810 | [NETLINK_ISCSI] = "iscsi", | |
811 | [NETLINK_AUDIT] = "audit", | |
812 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
813 | [NETLINK_CONNECTOR] = "connector", | |
814 | [NETLINK_NETFILTER] = "netfilter", | |
815 | [NETLINK_IP6_FW] = "ip6-fw", | |
816 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
817 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
818 | [NETLINK_GENERIC] = "generic", | |
819 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
820 | [NETLINK_ECRYPTFS] = "ecryptfs", |
821 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
822 | }; |
823 | ||
f8b69d1d | 824 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 825 | |
c0120d99 LP |
826 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
827 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
828 | [SOCKET_ADDRESS_BOTH] = "both", | |
829 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
830 | }; | |
831 | ||
832 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 | 833 | |
b54e98ef | 834 | SocketAddressBindIPv6Only socket_address_bind_ipv6_only_or_bool_from_string(const char *n) { |
6f90844f YW |
835 | int r; |
836 | ||
837 | r = parse_boolean(n); | |
838 | if (r > 0) | |
839 | return SOCKET_ADDRESS_IPV6_ONLY; | |
840 | if (r == 0) | |
841 | return SOCKET_ADDRESS_BOTH; | |
842 | ||
843 | return socket_address_bind_ipv6_only_from_string(n); | |
844 | } | |
845 | ||
f01e5736 LP |
846 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { |
847 | assert(a); | |
848 | assert(b); | |
849 | ||
850 | if (a->sa.sa_family != b->sa.sa_family) | |
851 | return false; | |
852 | ||
853 | if (a->sa.sa_family == AF_INET) | |
854 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
855 | ||
856 | if (a->sa.sa_family == AF_INET6) | |
857 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
858 | ||
0fc0f14b SH |
859 | if (a->sa.sa_family == AF_VSOCK) |
860 | return a->vm.svm_cid == b->vm.svm_cid; | |
861 | ||
f01e5736 LP |
862 | return false; |
863 | } | |
2583fbea LP |
864 | |
865 | int fd_inc_sndbuf(int fd, size_t n) { | |
866 | int r, value; | |
867 | socklen_t l = sizeof(value); | |
868 | ||
869 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
870 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
871 | return 0; | |
872 | ||
873 | /* If we have the privileges we will ignore the kernel limit. */ | |
874 | ||
9e5b6496 YW |
875 | if (setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, n) < 0) { |
876 | r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, n); | |
877 | if (r < 0) | |
878 | return r; | |
879 | } | |
2583fbea LP |
880 | |
881 | return 1; | |
882 | } | |
883 | ||
884 | int fd_inc_rcvbuf(int fd, size_t n) { | |
885 | int r, value; | |
886 | socklen_t l = sizeof(value); | |
887 | ||
888 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
889 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
890 | return 0; | |
891 | ||
892 | /* If we have the privileges we will ignore the kernel limit. */ | |
893 | ||
9e5b6496 YW |
894 | if (setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, n) < 0) { |
895 | r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, n); | |
896 | if (r < 0) | |
897 | return r; | |
898 | } | |
899 | ||
2583fbea LP |
900 | return 1; |
901 | } | |
902 | ||
903 | static const char* const ip_tos_table[] = { | |
904 | [IPTOS_LOWDELAY] = "low-delay", | |
905 | [IPTOS_THROUGHPUT] = "throughput", | |
906 | [IPTOS_RELIABILITY] = "reliability", | |
907 | [IPTOS_LOWCOST] = "low-cost", | |
908 | }; | |
909 | ||
910 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
911 | ||
ef76dff2 LP |
912 | bool ifname_valid(const char *p) { |
913 | bool numeric = true; | |
914 | ||
915 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
916 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
917 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
918 | ||
919 | if (isempty(p)) | |
920 | return false; | |
921 | ||
922 | if (strlen(p) >= IFNAMSIZ) | |
923 | return false; | |
924 | ||
49bfc877 | 925 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
926 | return false; |
927 | ||
928 | while (*p) { | |
929 | if ((unsigned char) *p >= 127U) | |
930 | return false; | |
931 | ||
932 | if ((unsigned char) *p <= 32U) | |
933 | return false; | |
934 | ||
4c701096 | 935 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
936 | return false; |
937 | ||
938 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
939 | p++; | |
940 | } | |
941 | ||
942 | if (numeric) | |
943 | return false; | |
944 | ||
945 | return true; | |
946 | } | |
947 | ||
26808948 SS |
948 | bool address_label_valid(const char *p) { |
949 | ||
950 | if (isempty(p)) | |
951 | return false; | |
952 | ||
953 | if (strlen(p) >= IFNAMSIZ) | |
954 | return false; | |
955 | ||
956 | while (*p) { | |
957 | if ((uint8_t) *p >= 127U) | |
958 | return false; | |
959 | ||
960 | if ((uint8_t) *p <= 31U) | |
961 | return false; | |
962 | p++; | |
963 | } | |
964 | ||
965 | return true; | |
966 | } | |
967 | ||
2583fbea LP |
968 | int getpeercred(int fd, struct ucred *ucred) { |
969 | socklen_t n = sizeof(struct ucred); | |
970 | struct ucred u; | |
971 | int r; | |
972 | ||
973 | assert(fd >= 0); | |
974 | assert(ucred); | |
975 | ||
976 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
977 | if (r < 0) | |
978 | return -errno; | |
979 | ||
980 | if (n != sizeof(struct ucred)) | |
981 | return -EIO; | |
982 | ||
bbcc701e LP |
983 | /* Check if the data is actually useful and not suppressed due to namespacing issues */ |
984 | if (!pid_is_valid(u.pid)) | |
2583fbea LP |
985 | return -ENODATA; |
986 | ||
bbcc701e LP |
987 | /* Note that we don't check UID/GID here, as namespace translation works differently there: instead of |
988 | * receiving in "invalid" user/group we get the overflow UID/GID. */ | |
989 | ||
2583fbea LP |
990 | *ucred = u; |
991 | return 0; | |
992 | } | |
993 | ||
994 | int getpeersec(int fd, char **ret) { | |
217d8967 | 995 | _cleanup_free_ char *s = NULL; |
2583fbea | 996 | socklen_t n = 64; |
2583fbea LP |
997 | |
998 | assert(fd >= 0); | |
999 | assert(ret); | |
1000 | ||
217d8967 LP |
1001 | for (;;) { |
1002 | s = new0(char, n+1); | |
1003 | if (!s) | |
1004 | return -ENOMEM; | |
2583fbea | 1005 | |
217d8967 LP |
1006 | if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0) |
1007 | break; | |
2583fbea LP |
1008 | |
1009 | if (errno != ERANGE) | |
1010 | return -errno; | |
1011 | ||
217d8967 | 1012 | s = mfree(s); |
2583fbea LP |
1013 | } |
1014 | ||
217d8967 | 1015 | if (isempty(s)) |
2583fbea | 1016 | return -EOPNOTSUPP; |
2583fbea | 1017 | |
ae2a15bc | 1018 | *ret = TAKE_PTR(s); |
217d8967 | 1019 | |
2583fbea LP |
1020 | return 0; |
1021 | } | |
1022 | ||
43f2c88d LP |
1023 | int getpeergroups(int fd, gid_t **ret) { |
1024 | socklen_t n = sizeof(gid_t) * 64; | |
1025 | _cleanup_free_ gid_t *d = NULL; | |
1026 | ||
75f40779 | 1027 | assert(fd >= 0); |
43f2c88d LP |
1028 | assert(ret); |
1029 | ||
1030 | for (;;) { | |
1031 | d = malloc(n); | |
1032 | if (!d) | |
1033 | return -ENOMEM; | |
1034 | ||
1035 | if (getsockopt(fd, SOL_SOCKET, SO_PEERGROUPS, d, &n) >= 0) | |
1036 | break; | |
1037 | ||
1038 | if (errno != ERANGE) | |
1039 | return -errno; | |
1040 | ||
1041 | d = mfree(d); | |
1042 | } | |
1043 | ||
1044 | assert_se(n % sizeof(gid_t) == 0); | |
1045 | n /= sizeof(gid_t); | |
1046 | ||
1047 | if ((socklen_t) (int) n != n) | |
1048 | return -E2BIG; | |
1049 | ||
1cc6c93a | 1050 | *ret = TAKE_PTR(d); |
43f2c88d LP |
1051 | |
1052 | return (int) n; | |
1053 | } | |
1054 | ||
d34673ec | 1055 | ssize_t send_one_fd_iov_sa( |
726f4c47 ZJS |
1056 | int transport_fd, |
1057 | int fd, | |
d34673ec | 1058 | struct iovec *iov, size_t iovlen, |
726f4c47 ZJS |
1059 | const struct sockaddr *sa, socklen_t len, |
1060 | int flags) { | |
1061 | ||
2583fbea LP |
1062 | union { |
1063 | struct cmsghdr cmsghdr; | |
1064 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1065 | } control = {}; | |
1066 | struct msghdr mh = { | |
726f4c47 ZJS |
1067 | .msg_name = (struct sockaddr*) sa, |
1068 | .msg_namelen = len, | |
d34673ec FB |
1069 | .msg_iov = iov, |
1070 | .msg_iovlen = iovlen, | |
2583fbea | 1071 | }; |
d34673ec | 1072 | ssize_t k; |
2583fbea LP |
1073 | |
1074 | assert(transport_fd >= 0); | |
2583fbea | 1075 | |
d34673ec FB |
1076 | /* |
1077 | * We need either an FD or data to send. | |
1078 | * If there's nothing, return an error. | |
1079 | */ | |
1080 | if (fd < 0 && !iov) | |
1081 | return -EINVAL; | |
2583fbea | 1082 | |
d34673ec FB |
1083 | if (fd >= 0) { |
1084 | struct cmsghdr *cmsg; | |
2583fbea | 1085 | |
d34673ec FB |
1086 | mh.msg_control = &control; |
1087 | mh.msg_controllen = sizeof(control); | |
1088 | ||
1089 | cmsg = CMSG_FIRSTHDR(&mh); | |
1090 | cmsg->cmsg_level = SOL_SOCKET; | |
1091 | cmsg->cmsg_type = SCM_RIGHTS; | |
1092 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1093 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1094 | ||
1095 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1096 | } | |
1097 | k = sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags); | |
1098 | if (k < 0) | |
1099 | return (ssize_t) -errno; | |
1100 | ||
1101 | return k; | |
2583fbea LP |
1102 | } |
1103 | ||
d34673ec FB |
1104 | int send_one_fd_sa( |
1105 | int transport_fd, | |
1106 | int fd, | |
1107 | const struct sockaddr *sa, socklen_t len, | |
1108 | int flags) { | |
1109 | ||
1110 | assert(fd >= 0); | |
1111 | ||
1112 | return (int) send_one_fd_iov_sa(transport_fd, fd, NULL, 0, sa, len, flags); | |
1113 | } | |
1114 | ||
1115 | ssize_t receive_one_fd_iov( | |
1116 | int transport_fd, | |
1117 | struct iovec *iov, size_t iovlen, | |
1118 | int flags, | |
1119 | int *ret_fd) { | |
1120 | ||
2583fbea LP |
1121 | union { |
1122 | struct cmsghdr cmsghdr; | |
1123 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1124 | } control = {}; | |
1125 | struct msghdr mh = { | |
1126 | .msg_control = &control, | |
1127 | .msg_controllen = sizeof(control), | |
d34673ec FB |
1128 | .msg_iov = iov, |
1129 | .msg_iovlen = iovlen, | |
2583fbea LP |
1130 | }; |
1131 | struct cmsghdr *cmsg, *found = NULL; | |
d34673ec | 1132 | ssize_t k; |
2583fbea LP |
1133 | |
1134 | assert(transport_fd >= 0); | |
d34673ec | 1135 | assert(ret_fd); |
2583fbea LP |
1136 | |
1137 | /* | |
1138 | * Receive a single FD via @transport_fd. We don't care for | |
1139 | * the transport-type. We retrieve a single FD at most, so for | |
1140 | * packet-based transports, the caller must ensure to send | |
1141 | * only a single FD per packet. This is best used in | |
1142 | * combination with send_one_fd(). | |
1143 | */ | |
1144 | ||
d34673ec FB |
1145 | k = recvmsg(transport_fd, &mh, MSG_CMSG_CLOEXEC | flags); |
1146 | if (k < 0) | |
1147 | return (ssize_t) -errno; | |
2583fbea LP |
1148 | |
1149 | CMSG_FOREACH(cmsg, &mh) { | |
1150 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1151 | cmsg->cmsg_type == SCM_RIGHTS && | |
1152 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1153 | assert(!found); | |
1154 | found = cmsg; | |
1155 | break; | |
1156 | } | |
1157 | } | |
1158 | ||
d34673ec | 1159 | if (!found) |
2583fbea | 1160 | cmsg_close_all(&mh); |
d34673ec FB |
1161 | |
1162 | /* If didn't receive an FD or any data, return an error. */ | |
1163 | if (k == 0 && !found) | |
2583fbea | 1164 | return -EIO; |
2583fbea | 1165 | |
d34673ec FB |
1166 | if (found) |
1167 | *ret_fd = *(int*) CMSG_DATA(found); | |
1168 | else | |
1169 | *ret_fd = -1; | |
1170 | ||
1171 | return k; | |
1172 | } | |
1173 | ||
1174 | int receive_one_fd(int transport_fd, int flags) { | |
1175 | int fd; | |
1176 | ssize_t k; | |
1177 | ||
1178 | k = receive_one_fd_iov(transport_fd, NULL, 0, flags, &fd); | |
1179 | if (k == 0) | |
1180 | return fd; | |
1181 | ||
1182 | /* k must be negative, since receive_one_fd_iov() only returns | |
1183 | * a positive value if data was received through the iov. */ | |
1184 | assert(k < 0); | |
1185 | return (int) k; | |
2583fbea | 1186 | } |
4edc2c9b LP |
1187 | |
1188 | ssize_t next_datagram_size_fd(int fd) { | |
1189 | ssize_t l; | |
1190 | int k; | |
1191 | ||
1192 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1193 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1194 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1195 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1196 | * the wrong size. */ | |
1197 | ||
1198 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1199 | if (l < 0) { | |
3742095b | 1200 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1201 | goto fallback; |
1202 | ||
1203 | return -errno; | |
1204 | } | |
1205 | if (l == 0) | |
1206 | goto fallback; | |
1207 | ||
1208 | return l; | |
1209 | ||
1210 | fallback: | |
1211 | k = 0; | |
1212 | ||
1213 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1214 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1215 | ||
1216 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1217 | return -errno; | |
1218 | ||
1219 | return (ssize_t) k; | |
1220 | } | |
60d9771c | 1221 | |
67962036 ZJS |
1222 | /* Put a limit on how many times will attempt to call accept4(). We loop |
1223 | * only on "transient" errors, but let's make sure we don't loop forever. */ | |
1224 | #define MAX_FLUSH_ITERATIONS 1024 | |
1225 | ||
60d9771c LP |
1226 | int flush_accept(int fd) { |
1227 | ||
1228 | struct pollfd pollfd = { | |
1229 | .fd = fd, | |
1230 | .events = POLLIN, | |
1231 | }; | |
f3d75364 LP |
1232 | int r, b; |
1233 | socklen_t l = sizeof(b); | |
1234 | ||
644cb4cc ZJS |
1235 | /* Similar to flush_fd() but flushes all incoming connections by accepting and immediately closing |
1236 | * them. */ | |
f3d75364 LP |
1237 | |
1238 | if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &b, &l) < 0) | |
1239 | return -errno; | |
60d9771c | 1240 | |
f3d75364 | 1241 | assert(l == sizeof(b)); |
644cb4cc ZJS |
1242 | if (!b) /* Let's check if this socket accepts connections before calling accept(). accept4() can |
1243 | * return EOPNOTSUPP if the fd is not a listening socket, which we should treat as a fatal | |
1244 | * error, or in case the incoming TCP connection triggered a network issue, which we want to | |
1245 | * treat as a transient error. Thus, let's rule out the first reason for EOPNOTSUPP early, so | |
1246 | * we can loop safely on transient errors below. */ | |
f3d75364 | 1247 | return -ENOTTY; |
60d9771c | 1248 | |
67962036 | 1249 | for (unsigned iteration = 0;; iteration++) { |
60d9771c LP |
1250 | int cfd; |
1251 | ||
1252 | r = poll(&pollfd, 1, 0); | |
1253 | if (r < 0) { | |
1254 | if (errno == EINTR) | |
1255 | continue; | |
1256 | ||
1257 | return -errno; | |
4ff9bc2e LP |
1258 | } |
1259 | if (r == 0) | |
60d9771c LP |
1260 | return 0; |
1261 | ||
67962036 ZJS |
1262 | if (iteration >= MAX_FLUSH_ITERATIONS) |
1263 | return log_debug_errno(SYNTHETIC_ERRNO(EBUSY), | |
1264 | "Failed to flush connections within " STRINGIFY(MAX_FLUSH_ITERATIONS) " iterations."); | |
1265 | ||
60d9771c LP |
1266 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); |
1267 | if (cfd < 0) { | |
60d9771c LP |
1268 | if (errno == EAGAIN) |
1269 | return 0; | |
1270 | ||
4ff9bc2e LP |
1271 | if (ERRNO_IS_ACCEPT_AGAIN(errno)) |
1272 | continue; | |
1273 | ||
60d9771c LP |
1274 | return -errno; |
1275 | } | |
1276 | ||
4ff9bc2e | 1277 | safe_close(cfd); |
60d9771c LP |
1278 | } |
1279 | } | |
29206d46 LP |
1280 | |
1281 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1282 | struct cmsghdr *cmsg; | |
1283 | ||
1284 | assert(mh); | |
1285 | ||
1286 | CMSG_FOREACH(cmsg, mh) | |
1287 | if (cmsg->cmsg_level == level && | |
1288 | cmsg->cmsg_type == type && | |
1289 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1290 | return cmsg; | |
1291 | ||
1292 | return NULL; | |
1293 | } | |
429b4350 LP |
1294 | |
1295 | int socket_ioctl_fd(void) { | |
1296 | int fd; | |
1297 | ||
1298 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1299 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1300 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1301 | * generic AF_NETLINK. */ | |
1302 | ||
1303 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1304 | if (fd < 0) | |
1305 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1306 | if (fd < 0) | |
1307 | return -errno; | |
1308 | ||
1309 | return fd; | |
1310 | } | |
9f20fc28 LP |
1311 | |
1312 | int sockaddr_un_unlink(const struct sockaddr_un *sa) { | |
1313 | const char *p, * nul; | |
1314 | ||
1315 | assert(sa); | |
1316 | ||
1317 | if (sa->sun_family != AF_UNIX) | |
1318 | return -EPROTOTYPE; | |
1319 | ||
1320 | if (sa->sun_path[0] == 0) /* Nothing to do for abstract sockets */ | |
1321 | return 0; | |
1322 | ||
1323 | /* The path in .sun_path is not necessarily NUL terminated. Let's fix that. */ | |
1324 | nul = memchr(sa->sun_path, 0, sizeof(sa->sun_path)); | |
1325 | if (nul) | |
1326 | p = sa->sun_path; | |
1327 | else | |
1328 | p = memdupa_suffix0(sa->sun_path, sizeof(sa->sun_path)); | |
1329 | ||
1330 | if (unlink(p) < 0) | |
1331 | return -errno; | |
1332 | ||
1333 | return 1; | |
1334 | } | |
5cf91ea9 LP |
1335 | |
1336 | int sockaddr_un_set_path(struct sockaddr_un *ret, const char *path) { | |
1337 | size_t l; | |
1338 | ||
1339 | assert(ret); | |
1340 | assert(path); | |
1341 | ||
1342 | /* Initialize ret->sun_path from the specified argument. This will interpret paths starting with '@' as | |
1343 | * abstract namespace sockets, and those starting with '/' as regular filesystem sockets. It won't accept | |
1344 | * anything else (i.e. no relative paths), to avoid ambiguities. Note that this function cannot be used to | |
1345 | * reference paths in the abstract namespace that include NUL bytes in the name. */ | |
1346 | ||
1347 | l = strlen(path); | |
1348 | if (l == 0) | |
1349 | return -EINVAL; | |
1350 | if (!IN_SET(path[0], '/', '@')) | |
1351 | return -EINVAL; | |
1352 | if (path[1] == 0) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | /* Don't allow paths larger than the space in sockaddr_un. Note that we are a tiny bit more restrictive than | |
1356 | * the kernel is: we insist on NUL termination (both for abstract namespace and regular file system socket | |
1357 | * addresses!), which the kernel doesn't. We do this to reduce chance of incompatibility with other apps that | |
1358 | * do not expect non-NUL terminated file system path*/ | |
1359 | if (l+1 > sizeof(ret->sun_path)) | |
1360 | return -EINVAL; | |
1361 | ||
1362 | *ret = (struct sockaddr_un) { | |
1363 | .sun_family = AF_UNIX, | |
1364 | }; | |
1365 | ||
1366 | if (path[0] == '@') { | |
1367 | /* Abstract namespace socket */ | |
1368 | memcpy(ret->sun_path + 1, path + 1, l); /* copy *with* trailing NUL byte */ | |
1369 | return (int) (offsetof(struct sockaddr_un, sun_path) + l); /* 🔥 *don't* 🔥 include trailing NUL in size */ | |
1370 | ||
1371 | } else { | |
1372 | assert(path[0] == '/'); | |
1373 | ||
1374 | /* File system socket */ | |
1375 | memcpy(ret->sun_path, path, l + 1); /* copy *with* trailing NUL byte */ | |
1376 | return (int) (offsetof(struct sockaddr_un, sun_path) + l + 1); /* include trailing NUL in size */ | |
1377 | } | |
1378 | } | |
5d594d01 LP |
1379 | |
1380 | int socket_bind_to_ifname(int fd, const char *ifname) { | |
1381 | assert(fd >= 0); | |
1382 | ||
1383 | /* Call with NULL to drop binding */ | |
1384 | ||
1385 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen_ptr(ifname)) < 0) | |
1386 | return -errno; | |
1387 | ||
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | int socket_bind_to_ifindex(int fd, int ifindex) { | |
518a66ec | 1392 | char ifname[IF_NAMESIZE + 1]; |
5d594d01 LP |
1393 | |
1394 | assert(fd >= 0); | |
1395 | ||
1396 | if (ifindex <= 0) { | |
1397 | /* Drop binding */ | |
1398 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, NULL, 0) < 0) | |
1399 | return -errno; | |
1400 | ||
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTOIFINDEX, &ifindex, sizeof(ifindex)) >= 0) | |
1405 | return 0; | |
1406 | if (errno != ENOPROTOOPT) | |
1407 | return -errno; | |
1408 | ||
1409 | /* Fall back to SO_BINDTODEVICE on kernels < 5.0 which didn't have SO_BINDTOIFINDEX */ | |
518a66ec | 1410 | if (!format_ifname(ifindex, ifname)) |
5d594d01 LP |
1411 | return -errno; |
1412 | ||
1413 | return socket_bind_to_ifname(fd, ifname); | |
1414 | } |