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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> |
07630cea | 14 | #include <string.h> |
f5947a5e | 15 | #include <sys/ioctl.h> |
07630cea | 16 | #include <unistd.h> |
42f4e3c4 | 17 | |
b5efdb8a | 18 | #include "alloc-util.h" |
4ff9bc2e | 19 | #include "errno-util.h" |
15dca371 | 20 | #include "escape.h" |
2583fbea | 21 | #include "fd-util.h" |
07630cea | 22 | #include "fileio.h" |
f97b34a6 | 23 | #include "format-util.h" |
93cc7779 | 24 | #include "log.h" |
42f4e3c4 | 25 | #include "macro.h" |
0a970718 | 26 | #include "memory-util.h" |
f5947a5e | 27 | #include "missing_socket.h" |
6bedfcbb | 28 | #include "parse-util.h" |
9eb977db | 29 | #include "path-util.h" |
dccca82b | 30 | #include "process-util.h" |
2583fbea | 31 | #include "socket-util.h" |
8b43440b | 32 | #include "string-table.h" |
07630cea | 33 | #include "string-util.h" |
ef76dff2 | 34 | #include "strv.h" |
ee104e11 | 35 | #include "user-util.h" |
ef76dff2 | 36 | #include "utf8.h" |
42f4e3c4 | 37 | |
349cc4a5 | 38 | #if ENABLE_IDN |
cadc80b8 | 39 | # define IDN_FLAGS NI_IDN |
6326a143 WB |
40 | #else |
41 | # define IDN_FLAGS 0 | |
42 | #endif | |
43 | ||
398ce0bc YW |
44 | static const char* const socket_address_type_table[] = { |
45 | [SOCK_STREAM] = "Stream", | |
46 | [SOCK_DGRAM] = "Datagram", | |
47 | [SOCK_RAW] = "Raw", | |
48 | [SOCK_RDM] = "ReliableDatagram", | |
49 | [SOCK_SEQPACKET] = "SequentialPacket", | |
50 | [SOCK_DCCP] = "DatagramCongestionControl", | |
51 | }; | |
52 | ||
53 | DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int); | |
54 | ||
542563ba | 55 | int socket_address_parse(SocketAddress *a, const char *s) { |
8d30fcb9 YW |
56 | _cleanup_free_ char *n = NULL; |
57 | char *e; | |
4d49b48c | 58 | int r; |
42f4e3c4 LP |
59 | |
60 | assert(a); | |
61 | assert(s); | |
62 | ||
9ec30b27 LP |
63 | *a = (SocketAddress) { |
64 | .type = SOCK_STREAM, | |
65 | }; | |
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 | ||
8d30fcb9 YW |
76 | n = strndup(s+1, e-s-1); |
77 | if (!n) | |
78 | return -ENOMEM; | |
42f4e3c4 LP |
79 | |
80 | errno = 0; | |
4d49b48c | 81 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
66855de7 | 82 | return errno_or_else(EINVAL); |
42f4e3c4 LP |
83 | |
84 | e++; | |
85 | if (*e != ':') | |
86 | return -EINVAL; | |
87 | ||
88 | e++; | |
89220e2f | 89 | r = parse_ip_port(e, &port); |
4d49b48c | 90 | if (r < 0) |
42f4e3c4 LP |
91 | return r; |
92 | ||
42f4e3c4 | 93 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 94 | a->sockaddr.in6.sin6_port = htobe16(port); |
42f4e3c4 | 95 | a->size = sizeof(struct sockaddr_in6); |
42f4e3c4 LP |
96 | |
97 | } else if (*s == '/') { | |
98 | /* AF_UNIX socket */ | |
99 | ||
100 | size_t l; | |
101 | ||
102 | l = strlen(s); | |
057e8580 LP |
103 | if (l >= sizeof(a->sockaddr.un.sun_path)) /* Note that we refuse non-NUL-terminated sockets when |
104 | * parsing (the kernel itself is less strict here in what it | |
105 | * accepts) */ | |
42f4e3c4 LP |
106 | return -EINVAL; |
107 | ||
108 | a->sockaddr.un.sun_family = AF_UNIX; | |
109 | memcpy(a->sockaddr.un.sun_path, s, l); | |
0e098b15 | 110 | a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
42f4e3c4 | 111 | |
1c24e7bd | 112 | } else if (*s == '@') { |
42f4e3c4 LP |
113 | /* Abstract AF_UNIX socket */ |
114 | size_t l; | |
115 | ||
116 | l = strlen(s+1); | |
15dca371 | 117 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) /* Note that we refuse non-NUL-terminated sockets here |
057e8580 LP |
118 | * when parsing, even though abstract namespace sockets |
119 | * explicitly allow embedded NUL bytes and don't consider | |
120 | * them special. But it's simply annoying to debug such | |
121 | * sockets. */ | |
42f4e3c4 LP |
122 | return -EINVAL; |
123 | ||
124 | a->sockaddr.un.sun_family = AF_UNIX; | |
125 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
0e098b15 | 126 | a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
42f4e3c4 | 127 | |
0fc0f14b SH |
128 | } else if (startswith(s, "vsock:")) { |
129 | /* AF_VSOCK socket in vsock:cid:port notation */ | |
fbd0b64f | 130 | const char *cid_start = s + STRLEN("vsock:"); |
89220e2f | 131 | unsigned port; |
0fc0f14b SH |
132 | |
133 | e = strchr(cid_start, ':'); | |
134 | if (!e) | |
135 | return -EINVAL; | |
136 | ||
89220e2f | 137 | r = safe_atou(e+1, &port); |
0fc0f14b SH |
138 | if (r < 0) |
139 | return r; | |
140 | ||
8d30fcb9 YW |
141 | n = strndup(cid_start, e - cid_start); |
142 | if (!n) | |
143 | return -ENOMEM; | |
144 | ||
0fc0f14b SH |
145 | if (!isempty(n)) { |
146 | r = safe_atou(n, &a->sockaddr.vm.svm_cid); | |
147 | if (r < 0) | |
148 | return r; | |
149 | } else | |
150 | a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; | |
151 | ||
152 | a->sockaddr.vm.svm_family = AF_VSOCK; | |
89220e2f | 153 | a->sockaddr.vm.svm_port = port; |
0fc0f14b SH |
154 | a->size = sizeof(struct sockaddr_vm); |
155 | ||
42f4e3c4 | 156 | } else { |
89220e2f LP |
157 | uint16_t port; |
158 | ||
4d49b48c LP |
159 | e = strchr(s, ':'); |
160 | if (e) { | |
89220e2f | 161 | r = parse_ip_port(e + 1, &port); |
4d49b48c | 162 | if (r < 0) |
542563ba LP |
163 | return r; |
164 | ||
8d30fcb9 YW |
165 | n = strndup(s, e-s); |
166 | if (!n) | |
167 | return -ENOMEM; | |
42f4e3c4 | 168 | |
542563ba | 169 | /* IPv4 in w.x.y.z:p notation? */ |
4d49b48c LP |
170 | r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
171 | if (r < 0) | |
542563ba | 172 | return -errno; |
42f4e3c4 | 173 | |
542563ba LP |
174 | if (r > 0) { |
175 | /* Gotcha, it's a traditional IPv4 address */ | |
4d49b48c | 176 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 177 | a->sockaddr.in.sin_port = htobe16(port); |
542563ba LP |
178 | a->size = sizeof(struct sockaddr_in); |
179 | } else { | |
180 | unsigned idx; | |
42f4e3c4 | 181 | |
4d49b48c | 182 | if (strlen(n) > IF_NAMESIZE-1) |
acbb0225 | 183 | return -EINVAL; |
acbb0225 | 184 | |
542563ba LP |
185 | /* Uh, our last resort, an interface name */ |
186 | idx = if_nametoindex(n); | |
83c60c9f | 187 | if (idx == 0) |
542563ba | 188 | return -EINVAL; |
42f4e3c4 | 189 | |
542563ba | 190 | a->sockaddr.in6.sin6_family = AF_INET6; |
89220e2f | 191 | a->sockaddr.in6.sin6_port = htobe16(port); |
542563ba | 192 | a->sockaddr.in6.sin6_scope_id = idx; |
83c60c9f | 193 | a->sockaddr.in6.sin6_addr = in6addr_any; |
542563ba LP |
194 | a->size = sizeof(struct sockaddr_in6); |
195 | } | |
42f4e3c4 LP |
196 | } else { |
197 | ||
198 | /* Just a port */ | |
89220e2f | 199 | r = parse_ip_port(s, &port); |
5198dabc | 200 | if (r < 0) |
42f4e3c4 LP |
201 | return r; |
202 | ||
5bfcc1c6 FF |
203 | if (socket_ipv6_is_supported()) { |
204 | a->sockaddr.in6.sin6_family = AF_INET6; | |
89220e2f | 205 | a->sockaddr.in6.sin6_port = htobe16(port); |
5bfcc1c6 FF |
206 | a->sockaddr.in6.sin6_addr = in6addr_any; |
207 | a->size = sizeof(struct sockaddr_in6); | |
208 | } else { | |
4d49b48c | 209 | a->sockaddr.in.sin_family = AF_INET; |
89220e2f | 210 | a->sockaddr.in.sin_port = htobe16(port); |
4d49b48c | 211 | a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
5bfcc1c6 FF |
212 | a->size = sizeof(struct sockaddr_in); |
213 | } | |
42f4e3c4 LP |
214 | } |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
7693146d LP |
220 | int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
221 | SocketAddress b; | |
222 | int r; | |
223 | ||
224 | /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ | |
225 | ||
226 | r = socket_address_parse(&b, s); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { | |
231 | log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); | |
232 | return -EAFNOSUPPORT; | |
233 | } | |
234 | ||
235 | *a = b; | |
236 | return 0; | |
237 | } | |
238 | ||
7a22745a | 239 | int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
528a74a1 | 240 | _cleanup_free_ char *word = NULL; |
7a22745a | 241 | unsigned group = 0; |
528a74a1 YW |
242 | int family, r; |
243 | ||
7a22745a LP |
244 | assert(a); |
245 | assert(s); | |
246 | ||
247 | zero(*a); | |
248 | a->type = SOCK_RAW; | |
249 | ||
528a74a1 YW |
250 | r = extract_first_word(&s, &word, NULL, 0); |
251 | if (r < 0) | |
252 | return r; | |
253 | if (r == 0) | |
254 | return -EINVAL; | |
7a22745a | 255 | |
528a74a1 | 256 | family = netlink_family_from_string(word); |
f8b69d1d MS |
257 | if (family < 0) |
258 | return -EINVAL; | |
7a22745a | 259 | |
528a74a1 YW |
260 | if (!isempty(s)) { |
261 | r = safe_atou(s, &group); | |
262 | if (r < 0) | |
263 | return r; | |
264 | } | |
265 | ||
7a22745a LP |
266 | a->sockaddr.nl.nl_family = AF_NETLINK; |
267 | a->sockaddr.nl.nl_groups = group; | |
268 | ||
269 | a->type = SOCK_RAW; | |
270 | a->size = sizeof(struct sockaddr_nl); | |
271 | a->protocol = family; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
15dca371 | 276 | int socket_address_verify(const SocketAddress *a, bool strict) { |
42f4e3c4 LP |
277 | assert(a); |
278 | ||
15dca371 ZJS |
279 | /* With 'strict' we enforce additional sanity constraints which are not set by the standard, |
280 | * but should only apply to sockets we create ourselves. */ | |
281 | ||
542563ba | 282 | switch (socket_address_family(a)) { |
42f4e3c4 | 283 | |
7a22745a LP |
284 | case AF_INET: |
285 | if (a->size != sizeof(struct sockaddr_in)) | |
286 | return -EINVAL; | |
42f4e3c4 | 287 | |
4d49b48c | 288 | if (a->sockaddr.in.sin_port == 0) |
7a22745a | 289 | return -EINVAL; |
42f4e3c4 | 290 | |
ec2ce0c5 | 291 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 292 | return -EINVAL; |
42f4e3c4 | 293 | |
7a22745a LP |
294 | return 0; |
295 | ||
296 | case AF_INET6: | |
297 | if (a->size != sizeof(struct sockaddr_in6)) | |
298 | return -EINVAL; | |
42f4e3c4 | 299 | |
7a22745a LP |
300 | if (a->sockaddr.in6.sin6_port == 0) |
301 | return -EINVAL; | |
42f4e3c4 | 302 | |
ec2ce0c5 | 303 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
7a22745a | 304 | return -EINVAL; |
42f4e3c4 | 305 | |
7a22745a | 306 | return 0; |
42f4e3c4 | 307 | |
7a22745a LP |
308 | case AF_UNIX: |
309 | if (a->size < offsetof(struct sockaddr_un, sun_path)) | |
310 | return -EINVAL; | |
15dca371 ZJS |
311 | if (a->size > sizeof(struct sockaddr_un) + !strict) |
312 | /* If !strict, allow one extra byte, since getsockname() on Linux will append | |
313 | * a NUL byte if we have path sockets that are above sun_path's full size. */ | |
8e8132c6 | 314 | return -EINVAL; |
42f4e3c4 | 315 | |
8e8132c6 | 316 | if (a->size > offsetof(struct sockaddr_un, sun_path) && |
15dca371 ZJS |
317 | a->sockaddr.un.sun_path[0] != 0 && |
318 | strict) { | |
319 | /* Only validate file system sockets here, and only in strict mode */ | |
8e8132c6 | 320 | const char *e; |
7a22745a | 321 | |
8e8132c6 LP |
322 | e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
323 | if (e) { | |
15dca371 | 324 | /* If there's an embedded NUL byte, make sure the size of the socket address matches it */ |
7a22745a LP |
325 | if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) |
326 | return -EINVAL; | |
8e8132c6 LP |
327 | } else { |
328 | /* If there's no embedded NUL byte, then then the size needs to match the whole | |
329 | * structure or the structure with one extra NUL byte suffixed. (Yeah, Linux is awful, | |
330 | * and considers both equivalent: getsockname() even extends sockaddr_un beyond its | |
331 | * size if the path is non NUL terminated.)*/ | |
332 | if (!IN_SET(a->size, sizeof(a->sockaddr.un.sun_path), sizeof(a->sockaddr.un.sun_path)+1)) | |
333 | return -EINVAL; | |
42f4e3c4 | 334 | } |
7a22745a | 335 | } |
42f4e3c4 | 336 | |
ec2ce0c5 | 337 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
7a22745a | 338 | return -EINVAL; |
42f4e3c4 | 339 | |
7a22745a LP |
340 | return 0; |
341 | ||
342 | case AF_NETLINK: | |
343 | ||
344 | if (a->size != sizeof(struct sockaddr_nl)) | |
345 | return -EINVAL; | |
346 | ||
ec2ce0c5 | 347 | if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
7a22745a LP |
348 | return -EINVAL; |
349 | ||
350 | return 0; | |
351 | ||
0fc0f14b SH |
352 | case AF_VSOCK: |
353 | if (a->size != sizeof(struct sockaddr_vm)) | |
354 | return -EINVAL; | |
355 | ||
ec2ce0c5 | 356 | if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
0fc0f14b SH |
357 | return -EINVAL; |
358 | ||
359 | return 0; | |
360 | ||
7a22745a LP |
361 | default: |
362 | return -EAFNOSUPPORT; | |
42f4e3c4 LP |
363 | } |
364 | } | |
365 | ||
4d49b48c | 366 | int socket_address_print(const SocketAddress *a, char **ret) { |
42f4e3c4 | 367 | int r; |
4d49b48c | 368 | |
42f4e3c4 | 369 | assert(a); |
4d49b48c | 370 | assert(ret); |
42f4e3c4 | 371 | |
15dca371 ZJS |
372 | r = socket_address_verify(a, false); /* We do non-strict validation, because we want to be |
373 | * able to pretty-print any socket the kernel considers | |
374 | * valid. We still need to do validation to know if we | |
375 | * can meaningfully print the address. */ | |
4d49b48c | 376 | if (r < 0) |
42f4e3c4 LP |
377 | return r; |
378 | ||
4d49b48c | 379 | if (socket_address_family(a) == AF_NETLINK) { |
7fd1b19b | 380 | _cleanup_free_ char *sfamily = NULL; |
7a22745a | 381 | |
f8b69d1d | 382 | r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
7a22745a | 383 | if (r < 0) |
f8b69d1d | 384 | return r; |
4d49b48c LP |
385 | |
386 | r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); | |
8520cfa5 MS |
387 | if (r < 0) |
388 | return -ENOMEM; | |
7a22745a LP |
389 | |
390 | return 0; | |
391 | } | |
392 | ||
3b1c5241 | 393 | return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
42f4e3c4 LP |
394 | } |
395 | ||
4f2d528d LP |
396 | bool socket_address_can_accept(const SocketAddress *a) { |
397 | assert(a); | |
398 | ||
399 | return | |
3742095b | 400 | IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
4f2d528d | 401 | } |
a16e1123 LP |
402 | |
403 | bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { | |
404 | assert(a); | |
405 | assert(b); | |
406 | ||
407 | /* Invalid addresses are unequal to all */ | |
15dca371 ZJS |
408 | if (socket_address_verify(a, false) < 0 || |
409 | socket_address_verify(b, false) < 0) | |
a16e1123 LP |
410 | return false; |
411 | ||
412 | if (a->type != b->type) | |
413 | return false; | |
414 | ||
a16e1123 LP |
415 | if (socket_address_family(a) != socket_address_family(b)) |
416 | return false; | |
417 | ||
418 | switch (socket_address_family(a)) { | |
419 | ||
420 | case AF_INET: | |
4d49b48c | 421 | if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
a16e1123 LP |
422 | return false; |
423 | ||
4d49b48c | 424 | if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
a16e1123 LP |
425 | return false; |
426 | ||
427 | break; | |
428 | ||
429 | case AF_INET6: | |
430 | if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) | |
431 | return false; | |
432 | ||
433 | if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) | |
434 | return false; | |
435 | ||
436 | break; | |
437 | ||
438 | case AF_UNIX: | |
710708a5 MS |
439 | if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
440 | b->size <= offsetof(struct sockaddr_un, sun_path)) | |
441 | return false; | |
442 | ||
a16e1123 LP |
443 | if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
444 | return false; | |
445 | ||
446 | if (a->sockaddr.un.sun_path[0]) { | |
e3f791a2 | 447 | if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
a16e1123 LP |
448 | return false; |
449 | } else { | |
c78e47a6 MS |
450 | if (a->size != b->size) |
451 | return false; | |
452 | ||
b12c1e7c | 453 | if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
a16e1123 LP |
454 | return false; |
455 | } | |
456 | ||
457 | break; | |
458 | ||
7a22745a | 459 | case AF_NETLINK: |
7a22745a LP |
460 | if (a->protocol != b->protocol) |
461 | return false; | |
462 | ||
463 | if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) | |
464 | return false; | |
465 | ||
466 | break; | |
467 | ||
0fc0f14b SH |
468 | case AF_VSOCK: |
469 | if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) | |
470 | return false; | |
471 | ||
472 | if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) | |
473 | return false; | |
474 | ||
475 | break; | |
476 | ||
a16e1123 LP |
477 | default: |
478 | /* Cannot compare, so we assume the addresses are different */ | |
479 | return false; | |
480 | } | |
481 | ||
482 | return true; | |
483 | } | |
484 | ||
27ca8d7a | 485 | bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
a16e1123 LP |
486 | struct SocketAddress b; |
487 | ||
488 | assert(a); | |
489 | assert(s); | |
490 | ||
491 | if (socket_address_parse(&b, s) < 0) | |
492 | return false; | |
493 | ||
27ca8d7a LP |
494 | b.type = type; |
495 | ||
a16e1123 | 496 | return socket_address_equal(a, &b); |
6e2ef85b LP |
497 | } |
498 | ||
7a22745a LP |
499 | bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
500 | struct SocketAddress b; | |
501 | ||
502 | assert(a); | |
503 | assert(s); | |
504 | ||
505 | if (socket_address_parse_netlink(&b, s) < 0) | |
506 | return false; | |
507 | ||
508 | return socket_address_equal(a, &b); | |
509 | } | |
510 | ||
a57f7e2c | 511 | const char* socket_address_get_path(const SocketAddress *a) { |
6e2ef85b LP |
512 | assert(a); |
513 | ||
514 | if (socket_address_family(a) != AF_UNIX) | |
a57f7e2c | 515 | return NULL; |
6e2ef85b LP |
516 | |
517 | if (a->sockaddr.un.sun_path[0] == 0) | |
a57f7e2c | 518 | return NULL; |
a16e1123 | 519 | |
48e6a2dc LP |
520 | /* Note that this is only safe because we know that there's an extra NUL byte after the sockaddr_un |
521 | * structure. On Linux AF_UNIX file system socket addresses don't have to be NUL terminated if they take up the | |
522 | * full sun_path space. */ | |
523 | assert_cc(sizeof(union sockaddr_union) >= sizeof(struct sockaddr_un)+1); | |
a57f7e2c | 524 | return a->sockaddr.un.sun_path; |
a16e1123 | 525 | } |
c0120d99 | 526 | |
5bfcc1c6 | 527 | bool socket_ipv6_is_supported(void) { |
629abfc2 | 528 | if (access("/proc/net/if_inet6", F_OK) != 0) |
90ab5042 | 529 | return false; |
f89f1e8f | 530 | |
7377964d | 531 | return true; |
5bfcc1c6 FF |
532 | } |
533 | ||
01e10de3 | 534 | bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
dbafedac MS |
535 | SocketAddress b; |
536 | socklen_t solen; | |
01e10de3 LP |
537 | |
538 | assert(a); | |
539 | assert(fd >= 0); | |
540 | ||
dbafedac MS |
541 | b.size = sizeof(b.sockaddr); |
542 | if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) | |
01e10de3 LP |
543 | return false; |
544 | ||
dbafedac | 545 | if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
01e10de3 LP |
546 | return false; |
547 | ||
dbafedac MS |
548 | solen = sizeof(b.type); |
549 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) | |
01e10de3 LP |
550 | return false; |
551 | ||
dbafedac | 552 | if (b.type != a->type) |
01e10de3 LP |
553 | return false; |
554 | ||
555 | if (a->protocol != 0) { | |
dbafedac MS |
556 | solen = sizeof(b.protocol); |
557 | if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) | |
01e10de3 LP |
558 | return false; |
559 | ||
dbafedac | 560 | if (b.protocol != a->protocol) |
01e10de3 LP |
561 | return false; |
562 | } | |
563 | ||
02233928 | 564 | return socket_address_equal(a, &b); |
01e10de3 LP |
565 | } |
566 | ||
f6aac5bf | 567 | int sockaddr_port(const struct sockaddr *_sa, unsigned *ret_port) { |
3b1c5241 SL |
568 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
569 | ||
f6aac5bf LP |
570 | /* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */ |
571 | ||
3b1c5241 SL |
572 | assert(sa); |
573 | ||
0fc0f14b | 574 | switch (sa->sa.sa_family) { |
f6aac5bf | 575 | |
0fc0f14b | 576 | case AF_INET: |
f6aac5bf | 577 | *ret_port = be16toh(sa->in.sin_port); |
0fc0f14b | 578 | return 0; |
3b1c5241 | 579 | |
0fc0f14b | 580 | case AF_INET6: |
f6aac5bf | 581 | *ret_port = be16toh(sa->in6.sin6_port); |
0fc0f14b SH |
582 | return 0; |
583 | ||
584 | case AF_VSOCK: | |
f6aac5bf | 585 | *ret_port = sa->vm.svm_port; |
0fc0f14b SH |
586 | return 0; |
587 | ||
588 | default: | |
589 | return -EAFNOSUPPORT; | |
590 | } | |
3b1c5241 SL |
591 | } |
592 | ||
836f9cfe LP |
593 | int sockaddr_pretty( |
594 | const struct sockaddr *_sa, | |
595 | socklen_t salen, | |
596 | bool translate_ipv6, | |
597 | bool include_port, | |
598 | char **ret) { | |
599 | ||
4d49b48c | 600 | union sockaddr_union *sa = (union sockaddr_union*) _sa; |
8569a776 | 601 | char *p; |
fc25ad25 | 602 | int r; |
8569a776 | 603 | |
4d49b48c LP |
604 | assert(sa); |
605 | assert(salen >= sizeof(sa->sa.sa_family)); | |
8569a776 | 606 | |
4d49b48c | 607 | switch (sa->sa.sa_family) { |
8569a776 LP |
608 | |
609 | case AF_INET: { | |
610 | uint32_t a; | |
611 | ||
8e38570e | 612 | a = be32toh(sa->in.sin_addr.s_addr); |
8569a776 | 613 | |
fc25ad25 ZJS |
614 | if (include_port) |
615 | r = asprintf(&p, | |
3b1c5241 SL |
616 | "%u.%u.%u.%u:%u", |
617 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF, | |
8e38570e | 618 | be16toh(sa->in.sin_port)); |
fc25ad25 ZJS |
619 | else |
620 | r = asprintf(&p, | |
3b1c5241 | 621 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
622 | a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF); |
623 | if (r < 0) | |
624 | return -ENOMEM; | |
8569a776 LP |
625 | break; |
626 | } | |
627 | ||
628 | case AF_INET6: { | |
629 | static const unsigned char ipv4_prefix[] = { | |
630 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF | |
631 | }; | |
632 | ||
fc25ad25 ZJS |
633 | if (translate_ipv6 && |
634 | memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) { | |
4d49b48c | 635 | const uint8_t *a = sa->in6.sin6_addr.s6_addr+12; |
fc25ad25 ZJS |
636 | if (include_port) |
637 | r = asprintf(&p, | |
3b1c5241 SL |
638 | "%u.%u.%u.%u:%u", |
639 | a[0], a[1], a[2], a[3], | |
8e38570e | 640 | be16toh(sa->in6.sin6_port)); |
fc25ad25 ZJS |
641 | else |
642 | r = asprintf(&p, | |
3b1c5241 | 643 | "%u.%u.%u.%u", |
fc25ad25 ZJS |
644 | a[0], a[1], a[2], a[3]); |
645 | if (r < 0) | |
646 | return -ENOMEM; | |
8569a776 LP |
647 | } else { |
648 | char a[INET6_ADDRSTRLEN]; | |
649 | ||
3b1c5241 SL |
650 | inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)); |
651 | ||
652 | if (include_port) { | |
fc25ad25 | 653 | r = asprintf(&p, |
3b1c5241 SL |
654 | "[%s]:%u", |
655 | a, | |
8e38570e | 656 | be16toh(sa->in6.sin6_port)); |
fc25ad25 | 657 | if (r < 0) |
3b1c5241 SL |
658 | return -ENOMEM; |
659 | } else { | |
660 | p = strdup(a); | |
661 | if (!p) | |
662 | return -ENOMEM; | |
663 | } | |
8569a776 LP |
664 | } |
665 | ||
666 | break; | |
667 | } | |
668 | ||
4d49b48c | 669 | case AF_UNIX: |
15dca371 | 670 | if (salen <= offsetof(struct sockaddr_un, sun_path) || |
994b9d4e | 671 | (sa->un.sun_path[0] == 0 && salen == offsetof(struct sockaddr_un, sun_path) + 1)) |
15dca371 | 672 | /* The name must have at least one character (and the leading NUL does not count) */ |
4d49b48c | 673 | p = strdup("<unnamed>"); |
994b9d4e | 674 | else { |
085b39e9 LP |
675 | /* Note that we calculate the path pointer here through the .un_buffer[] field, in order to |
676 | * outtrick bounds checking tools such as ubsan, which are too smart for their own good: on | |
677 | * Linux the kernel may return sun_path[] data one byte longer than the declared size of the | |
678 | * field. */ | |
679 | char *path = (char*) sa->un_buffer + offsetof(struct sockaddr_un, sun_path); | |
15dca371 | 680 | size_t path_len = salen - offsetof(struct sockaddr_un, sun_path); |
8569a776 | 681 | |
085b39e9 | 682 | if (path[0] == 0) { |
15dca371 ZJS |
683 | /* Abstract socket. When parsing address information from, we |
684 | * explicitly reject overly long paths and paths with embedded NULs. | |
685 | * But we might get such a socket from the outside. Let's return | |
686 | * something meaningful and printable in this case. */ | |
4d49b48c | 687 | |
15dca371 | 688 | _cleanup_free_ char *e = NULL; |
4d49b48c | 689 | |
085b39e9 | 690 | e = cescape_length(path + 1, path_len - 1); |
15dca371 ZJS |
691 | if (!e) |
692 | return -ENOMEM; | |
4d49b48c | 693 | |
15dca371 ZJS |
694 | p = strjoin("@", e); |
695 | } else { | |
085b39e9 | 696 | if (path[path_len - 1] == '\0') |
15dca371 ZJS |
697 | /* We expect a terminating NUL and don't print it */ |
698 | path_len --; | |
699 | ||
085b39e9 | 700 | p = cescape_length(path, path_len); |
15dca371 | 701 | } |
4d49b48c | 702 | } |
994b9d4e LP |
703 | if (!p) |
704 | return -ENOMEM; | |
8569a776 LP |
705 | |
706 | break; | |
8569a776 | 707 | |
0fc0f14b | 708 | case AF_VSOCK: |
3a484991 ZJS |
709 | if (include_port) { |
710 | if (sa->vm.svm_cid == VMADDR_CID_ANY) | |
711 | r = asprintf(&p, "vsock::%u", sa->vm.svm_port); | |
712 | else | |
713 | r = asprintf(&p, "vsock:%u:%u", sa->vm.svm_cid, sa->vm.svm_port); | |
714 | } else | |
0fc0f14b SH |
715 | r = asprintf(&p, "vsock:%u", sa->vm.svm_cid); |
716 | if (r < 0) | |
717 | return -ENOMEM; | |
718 | break; | |
719 | ||
8569a776 | 720 | default: |
15411c0c | 721 | return -EOPNOTSUPP; |
8569a776 LP |
722 | } |
723 | ||
724 | *ret = p; | |
725 | return 0; | |
726 | } | |
727 | ||
366b7db4 | 728 | int getpeername_pretty(int fd, bool include_port, char **ret) { |
4d49b48c | 729 | union sockaddr_union sa; |
b31f535c | 730 | socklen_t salen = sizeof(sa); |
eff05270 | 731 | int r; |
4d49b48c LP |
732 | |
733 | assert(fd >= 0); | |
734 | assert(ret); | |
735 | ||
4d49b48c LP |
736 | if (getpeername(fd, &sa.sa, &salen) < 0) |
737 | return -errno; | |
738 | ||
739 | if (sa.sa.sa_family == AF_UNIX) { | |
39883f62 | 740 | struct ucred ucred = {}; |
4d49b48c LP |
741 | |
742 | /* UNIX connection sockets are anonymous, so let's use | |
743 | * PID/UID as pretty credentials instead */ | |
744 | ||
eff05270 LP |
745 | r = getpeercred(fd, &ucred); |
746 | if (r < 0) | |
747 | return r; | |
4d49b48c | 748 | |
de0671ee | 749 | if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0) |
4d49b48c LP |
750 | return -ENOMEM; |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
755 | /* For remote sockets we translate IPv6 addresses back to IPv4 | |
756 | * if applicable, since that's nicer. */ | |
757 | ||
366b7db4 | 758 | return sockaddr_pretty(&sa.sa, salen, true, include_port, ret); |
4d49b48c LP |
759 | } |
760 | ||
761 | int getsockname_pretty(int fd, char **ret) { | |
762 | union sockaddr_union sa; | |
b31f535c | 763 | socklen_t salen = sizeof(sa); |
4d49b48c LP |
764 | |
765 | assert(fd >= 0); | |
766 | assert(ret); | |
767 | ||
4d49b48c LP |
768 | if (getsockname(fd, &sa.sa, &salen) < 0) |
769 | return -errno; | |
770 | ||
771 | /* For local sockets we do not translate IPv6 addresses back | |
772 | * to IPv6 if applicable, since this is usually used for | |
773 | * listening sockets where the difference between IPv4 and | |
774 | * IPv6 matters. */ | |
775 | ||
3b1c5241 | 776 | return sockaddr_pretty(&sa.sa, salen, false, true, ret); |
4d49b48c LP |
777 | } |
778 | ||
b31f535c ZJS |
779 | int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) { |
780 | int r; | |
781 | char host[NI_MAXHOST], *ret; | |
782 | ||
783 | assert(_ret); | |
784 | ||
6326a143 | 785 | r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0, IDN_FLAGS); |
b31f535c | 786 | if (r != 0) { |
b31f535c ZJS |
787 | int saved_errno = errno; |
788 | ||
3b1c5241 | 789 | r = sockaddr_pretty(&sa->sa, salen, true, true, &ret); |
f647962d | 790 | if (r < 0) |
1938ac51 | 791 | return r; |
b31f535c | 792 | |
279d3c9c | 793 | log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret); |
cb651834 ZJS |
794 | } else { |
795 | ret = strdup(host); | |
796 | if (!ret) | |
1938ac51 | 797 | return -ENOMEM; |
cb651834 | 798 | } |
b31f535c ZJS |
799 | |
800 | *_ret = ret; | |
801 | return 0; | |
802 | } | |
803 | ||
7a22745a LP |
804 | static const char* const netlink_family_table[] = { |
805 | [NETLINK_ROUTE] = "route", | |
806 | [NETLINK_FIREWALL] = "firewall", | |
807 | [NETLINK_INET_DIAG] = "inet-diag", | |
808 | [NETLINK_NFLOG] = "nflog", | |
809 | [NETLINK_XFRM] = "xfrm", | |
810 | [NETLINK_SELINUX] = "selinux", | |
811 | [NETLINK_ISCSI] = "iscsi", | |
812 | [NETLINK_AUDIT] = "audit", | |
813 | [NETLINK_FIB_LOOKUP] = "fib-lookup", | |
814 | [NETLINK_CONNECTOR] = "connector", | |
815 | [NETLINK_NETFILTER] = "netfilter", | |
816 | [NETLINK_IP6_FW] = "ip6-fw", | |
817 | [NETLINK_DNRTMSG] = "dnrtmsg", | |
818 | [NETLINK_KOBJECT_UEVENT] = "kobject-uevent", | |
819 | [NETLINK_GENERIC] = "generic", | |
820 | [NETLINK_SCSITRANSPORT] = "scsitransport", | |
5570d7f9 JG |
821 | [NETLINK_ECRYPTFS] = "ecryptfs", |
822 | [NETLINK_RDMA] = "rdma", | |
7a22745a LP |
823 | }; |
824 | ||
f8b69d1d | 825 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX); |
7a22745a | 826 | |
c0120d99 LP |
827 | static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = { |
828 | [SOCKET_ADDRESS_DEFAULT] = "default", | |
829 | [SOCKET_ADDRESS_BOTH] = "both", | |
830 | [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only" | |
831 | }; | |
832 | ||
833 | DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only); | |
f01e5736 | 834 | |
b54e98ef | 835 | SocketAddressBindIPv6Only socket_address_bind_ipv6_only_or_bool_from_string(const char *n) { |
6f90844f YW |
836 | int r; |
837 | ||
838 | r = parse_boolean(n); | |
839 | if (r > 0) | |
840 | return SOCKET_ADDRESS_IPV6_ONLY; | |
841 | if (r == 0) | |
842 | return SOCKET_ADDRESS_BOTH; | |
843 | ||
844 | return socket_address_bind_ipv6_only_from_string(n); | |
845 | } | |
846 | ||
f01e5736 LP |
847 | bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) { |
848 | assert(a); | |
849 | assert(b); | |
850 | ||
851 | if (a->sa.sa_family != b->sa.sa_family) | |
852 | return false; | |
853 | ||
854 | if (a->sa.sa_family == AF_INET) | |
855 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
856 | ||
857 | if (a->sa.sa_family == AF_INET6) | |
858 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
859 | ||
0fc0f14b SH |
860 | if (a->sa.sa_family == AF_VSOCK) |
861 | return a->vm.svm_cid == b->vm.svm_cid; | |
862 | ||
f01e5736 LP |
863 | return false; |
864 | } | |
2583fbea LP |
865 | |
866 | int fd_inc_sndbuf(int fd, size_t n) { | |
867 | int r, value; | |
868 | socklen_t l = sizeof(value); | |
869 | ||
870 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
871 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
872 | return 0; | |
873 | ||
874 | /* If we have the privileges we will ignore the kernel limit. */ | |
875 | ||
9e5b6496 YW |
876 | if (setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, n) < 0) { |
877 | r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, n); | |
878 | if (r < 0) | |
879 | return r; | |
880 | } | |
2583fbea LP |
881 | |
882 | return 1; | |
883 | } | |
884 | ||
885 | int fd_inc_rcvbuf(int fd, size_t n) { | |
886 | int r, value; | |
887 | socklen_t l = sizeof(value); | |
888 | ||
889 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
890 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) | |
891 | return 0; | |
892 | ||
893 | /* If we have the privileges we will ignore the kernel limit. */ | |
894 | ||
9e5b6496 YW |
895 | if (setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, n) < 0) { |
896 | r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, n); | |
897 | if (r < 0) | |
898 | return r; | |
899 | } | |
900 | ||
2583fbea LP |
901 | return 1; |
902 | } | |
903 | ||
904 | static const char* const ip_tos_table[] = { | |
905 | [IPTOS_LOWDELAY] = "low-delay", | |
906 | [IPTOS_THROUGHPUT] = "throughput", | |
907 | [IPTOS_RELIABILITY] = "reliability", | |
908 | [IPTOS_LOWCOST] = "low-cost", | |
909 | }; | |
910 | ||
911 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
912 | ||
ef76dff2 LP |
913 | bool ifname_valid(const char *p) { |
914 | bool numeric = true; | |
915 | ||
916 | /* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources | |
917 | * but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We | |
918 | * also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */ | |
919 | ||
920 | if (isempty(p)) | |
921 | return false; | |
922 | ||
923 | if (strlen(p) >= IFNAMSIZ) | |
924 | return false; | |
925 | ||
49bfc877 | 926 | if (dot_or_dot_dot(p)) |
ef76dff2 LP |
927 | return false; |
928 | ||
929 | while (*p) { | |
930 | if ((unsigned char) *p >= 127U) | |
931 | return false; | |
932 | ||
933 | if ((unsigned char) *p <= 32U) | |
934 | return false; | |
935 | ||
4c701096 | 936 | if (IN_SET(*p, ':', '/')) |
ef76dff2 LP |
937 | return false; |
938 | ||
939 | numeric = numeric && (*p >= '0' && *p <= '9'); | |
940 | p++; | |
941 | } | |
942 | ||
943 | if (numeric) | |
944 | return false; | |
945 | ||
946 | return true; | |
947 | } | |
948 | ||
26808948 SS |
949 | bool address_label_valid(const char *p) { |
950 | ||
951 | if (isempty(p)) | |
952 | return false; | |
953 | ||
954 | if (strlen(p) >= IFNAMSIZ) | |
955 | return false; | |
956 | ||
957 | while (*p) { | |
958 | if ((uint8_t) *p >= 127U) | |
959 | return false; | |
960 | ||
961 | if ((uint8_t) *p <= 31U) | |
962 | return false; | |
963 | p++; | |
964 | } | |
965 | ||
966 | return true; | |
967 | } | |
968 | ||
2583fbea LP |
969 | int getpeercred(int fd, struct ucred *ucred) { |
970 | socklen_t n = sizeof(struct ucred); | |
971 | struct ucred u; | |
972 | int r; | |
973 | ||
974 | assert(fd >= 0); | |
975 | assert(ucred); | |
976 | ||
977 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
978 | if (r < 0) | |
979 | return -errno; | |
980 | ||
981 | if (n != sizeof(struct ucred)) | |
982 | return -EIO; | |
983 | ||
bbcc701e LP |
984 | /* Check if the data is actually useful and not suppressed due to namespacing issues */ |
985 | if (!pid_is_valid(u.pid)) | |
2583fbea LP |
986 | return -ENODATA; |
987 | ||
bbcc701e LP |
988 | /* Note that we don't check UID/GID here, as namespace translation works differently there: instead of |
989 | * receiving in "invalid" user/group we get the overflow UID/GID. */ | |
990 | ||
2583fbea LP |
991 | *ucred = u; |
992 | return 0; | |
993 | } | |
994 | ||
995 | int getpeersec(int fd, char **ret) { | |
217d8967 | 996 | _cleanup_free_ char *s = NULL; |
2583fbea | 997 | socklen_t n = 64; |
2583fbea LP |
998 | |
999 | assert(fd >= 0); | |
1000 | assert(ret); | |
1001 | ||
217d8967 LP |
1002 | for (;;) { |
1003 | s = new0(char, n+1); | |
1004 | if (!s) | |
1005 | return -ENOMEM; | |
2583fbea | 1006 | |
217d8967 LP |
1007 | if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0) |
1008 | break; | |
2583fbea LP |
1009 | |
1010 | if (errno != ERANGE) | |
1011 | return -errno; | |
1012 | ||
217d8967 | 1013 | s = mfree(s); |
2583fbea LP |
1014 | } |
1015 | ||
217d8967 | 1016 | if (isempty(s)) |
2583fbea | 1017 | return -EOPNOTSUPP; |
2583fbea | 1018 | |
ae2a15bc | 1019 | *ret = TAKE_PTR(s); |
217d8967 | 1020 | |
2583fbea LP |
1021 | return 0; |
1022 | } | |
1023 | ||
43f2c88d LP |
1024 | int getpeergroups(int fd, gid_t **ret) { |
1025 | socklen_t n = sizeof(gid_t) * 64; | |
1026 | _cleanup_free_ gid_t *d = NULL; | |
1027 | ||
75f40779 | 1028 | assert(fd >= 0); |
43f2c88d LP |
1029 | assert(ret); |
1030 | ||
1031 | for (;;) { | |
1032 | d = malloc(n); | |
1033 | if (!d) | |
1034 | return -ENOMEM; | |
1035 | ||
1036 | if (getsockopt(fd, SOL_SOCKET, SO_PEERGROUPS, d, &n) >= 0) | |
1037 | break; | |
1038 | ||
1039 | if (errno != ERANGE) | |
1040 | return -errno; | |
1041 | ||
1042 | d = mfree(d); | |
1043 | } | |
1044 | ||
1045 | assert_se(n % sizeof(gid_t) == 0); | |
1046 | n /= sizeof(gid_t); | |
1047 | ||
1048 | if ((socklen_t) (int) n != n) | |
1049 | return -E2BIG; | |
1050 | ||
1cc6c93a | 1051 | *ret = TAKE_PTR(d); |
43f2c88d LP |
1052 | |
1053 | return (int) n; | |
1054 | } | |
1055 | ||
d34673ec | 1056 | ssize_t send_one_fd_iov_sa( |
726f4c47 ZJS |
1057 | int transport_fd, |
1058 | int fd, | |
d34673ec | 1059 | struct iovec *iov, size_t iovlen, |
726f4c47 ZJS |
1060 | const struct sockaddr *sa, socklen_t len, |
1061 | int flags) { | |
1062 | ||
2583fbea LP |
1063 | union { |
1064 | struct cmsghdr cmsghdr; | |
1065 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1066 | } control = {}; | |
1067 | struct msghdr mh = { | |
726f4c47 ZJS |
1068 | .msg_name = (struct sockaddr*) sa, |
1069 | .msg_namelen = len, | |
d34673ec FB |
1070 | .msg_iov = iov, |
1071 | .msg_iovlen = iovlen, | |
2583fbea | 1072 | }; |
d34673ec | 1073 | ssize_t k; |
2583fbea LP |
1074 | |
1075 | assert(transport_fd >= 0); | |
2583fbea | 1076 | |
d34673ec FB |
1077 | /* |
1078 | * We need either an FD or data to send. | |
1079 | * If there's nothing, return an error. | |
1080 | */ | |
1081 | if (fd < 0 && !iov) | |
1082 | return -EINVAL; | |
2583fbea | 1083 | |
d34673ec FB |
1084 | if (fd >= 0) { |
1085 | struct cmsghdr *cmsg; | |
2583fbea | 1086 | |
d34673ec FB |
1087 | mh.msg_control = &control; |
1088 | mh.msg_controllen = sizeof(control); | |
1089 | ||
1090 | cmsg = CMSG_FIRSTHDR(&mh); | |
1091 | cmsg->cmsg_level = SOL_SOCKET; | |
1092 | cmsg->cmsg_type = SCM_RIGHTS; | |
1093 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1094 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1095 | ||
1096 | mh.msg_controllen = CMSG_SPACE(sizeof(int)); | |
1097 | } | |
1098 | k = sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags); | |
1099 | if (k < 0) | |
1100 | return (ssize_t) -errno; | |
1101 | ||
1102 | return k; | |
2583fbea LP |
1103 | } |
1104 | ||
d34673ec FB |
1105 | int send_one_fd_sa( |
1106 | int transport_fd, | |
1107 | int fd, | |
1108 | const struct sockaddr *sa, socklen_t len, | |
1109 | int flags) { | |
1110 | ||
1111 | assert(fd >= 0); | |
1112 | ||
1113 | return (int) send_one_fd_iov_sa(transport_fd, fd, NULL, 0, sa, len, flags); | |
1114 | } | |
1115 | ||
1116 | ssize_t receive_one_fd_iov( | |
1117 | int transport_fd, | |
1118 | struct iovec *iov, size_t iovlen, | |
1119 | int flags, | |
1120 | int *ret_fd) { | |
1121 | ||
2583fbea LP |
1122 | union { |
1123 | struct cmsghdr cmsghdr; | |
1124 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1125 | } control = {}; | |
1126 | struct msghdr mh = { | |
1127 | .msg_control = &control, | |
1128 | .msg_controllen = sizeof(control), | |
d34673ec FB |
1129 | .msg_iov = iov, |
1130 | .msg_iovlen = iovlen, | |
2583fbea LP |
1131 | }; |
1132 | struct cmsghdr *cmsg, *found = NULL; | |
d34673ec | 1133 | ssize_t k; |
2583fbea LP |
1134 | |
1135 | assert(transport_fd >= 0); | |
d34673ec | 1136 | assert(ret_fd); |
2583fbea LP |
1137 | |
1138 | /* | |
1139 | * Receive a single FD via @transport_fd. We don't care for | |
1140 | * the transport-type. We retrieve a single FD at most, so for | |
1141 | * packet-based transports, the caller must ensure to send | |
1142 | * only a single FD per packet. This is best used in | |
1143 | * combination with send_one_fd(). | |
1144 | */ | |
1145 | ||
d34673ec FB |
1146 | k = recvmsg(transport_fd, &mh, MSG_CMSG_CLOEXEC | flags); |
1147 | if (k < 0) | |
1148 | return (ssize_t) -errno; | |
2583fbea LP |
1149 | |
1150 | CMSG_FOREACH(cmsg, &mh) { | |
1151 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1152 | cmsg->cmsg_type == SCM_RIGHTS && | |
1153 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1154 | assert(!found); | |
1155 | found = cmsg; | |
1156 | break; | |
1157 | } | |
1158 | } | |
1159 | ||
d34673ec | 1160 | if (!found) |
2583fbea | 1161 | cmsg_close_all(&mh); |
d34673ec FB |
1162 | |
1163 | /* If didn't receive an FD or any data, return an error. */ | |
1164 | if (k == 0 && !found) | |
2583fbea | 1165 | return -EIO; |
2583fbea | 1166 | |
d34673ec FB |
1167 | if (found) |
1168 | *ret_fd = *(int*) CMSG_DATA(found); | |
1169 | else | |
1170 | *ret_fd = -1; | |
1171 | ||
1172 | return k; | |
1173 | } | |
1174 | ||
1175 | int receive_one_fd(int transport_fd, int flags) { | |
1176 | int fd; | |
1177 | ssize_t k; | |
1178 | ||
1179 | k = receive_one_fd_iov(transport_fd, NULL, 0, flags, &fd); | |
1180 | if (k == 0) | |
1181 | return fd; | |
1182 | ||
1183 | /* k must be negative, since receive_one_fd_iov() only returns | |
1184 | * a positive value if data was received through the iov. */ | |
1185 | assert(k < 0); | |
1186 | return (int) k; | |
2583fbea | 1187 | } |
4edc2c9b LP |
1188 | |
1189 | ssize_t next_datagram_size_fd(int fd) { | |
1190 | ssize_t l; | |
1191 | int k; | |
1192 | ||
1193 | /* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will | |
96d49011 | 1194 | * actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't |
4edc2c9b LP |
1195 | * do. This difference is actually of major importance as we need to be sure that the size returned here |
1196 | * actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of | |
1197 | * the wrong size. */ | |
1198 | ||
1199 | l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC); | |
1200 | if (l < 0) { | |
3742095b | 1201 | if (IN_SET(errno, EOPNOTSUPP, EFAULT)) |
4edc2c9b LP |
1202 | goto fallback; |
1203 | ||
1204 | return -errno; | |
1205 | } | |
1206 | if (l == 0) | |
1207 | goto fallback; | |
1208 | ||
1209 | return l; | |
1210 | ||
1211 | fallback: | |
1212 | k = 0; | |
1213 | ||
1214 | /* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD | |
1215 | * for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */ | |
1216 | ||
1217 | if (ioctl(fd, FIONREAD, &k) < 0) | |
1218 | return -errno; | |
1219 | ||
1220 | return (ssize_t) k; | |
1221 | } | |
60d9771c | 1222 | |
67962036 ZJS |
1223 | /* Put a limit on how many times will attempt to call accept4(). We loop |
1224 | * only on "transient" errors, but let's make sure we don't loop forever. */ | |
1225 | #define MAX_FLUSH_ITERATIONS 1024 | |
1226 | ||
60d9771c LP |
1227 | int flush_accept(int fd) { |
1228 | ||
1229 | struct pollfd pollfd = { | |
1230 | .fd = fd, | |
1231 | .events = POLLIN, | |
1232 | }; | |
f3d75364 LP |
1233 | int r, b; |
1234 | socklen_t l = sizeof(b); | |
1235 | ||
644cb4cc ZJS |
1236 | /* Similar to flush_fd() but flushes all incoming connections by accepting and immediately closing |
1237 | * them. */ | |
f3d75364 LP |
1238 | |
1239 | if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &b, &l) < 0) | |
1240 | return -errno; | |
60d9771c | 1241 | |
f3d75364 | 1242 | assert(l == sizeof(b)); |
644cb4cc ZJS |
1243 | if (!b) /* Let's check if this socket accepts connections before calling accept(). accept4() can |
1244 | * return EOPNOTSUPP if the fd is not a listening socket, which we should treat as a fatal | |
1245 | * error, or in case the incoming TCP connection triggered a network issue, which we want to | |
1246 | * treat as a transient error. Thus, let's rule out the first reason for EOPNOTSUPP early, so | |
1247 | * we can loop safely on transient errors below. */ | |
f3d75364 | 1248 | return -ENOTTY; |
60d9771c | 1249 | |
67962036 | 1250 | for (unsigned iteration = 0;; iteration++) { |
60d9771c LP |
1251 | int cfd; |
1252 | ||
1253 | r = poll(&pollfd, 1, 0); | |
1254 | if (r < 0) { | |
1255 | if (errno == EINTR) | |
1256 | continue; | |
1257 | ||
1258 | return -errno; | |
4ff9bc2e LP |
1259 | } |
1260 | if (r == 0) | |
60d9771c LP |
1261 | return 0; |
1262 | ||
67962036 ZJS |
1263 | if (iteration >= MAX_FLUSH_ITERATIONS) |
1264 | return log_debug_errno(SYNTHETIC_ERRNO(EBUSY), | |
1265 | "Failed to flush connections within " STRINGIFY(MAX_FLUSH_ITERATIONS) " iterations."); | |
1266 | ||
60d9771c LP |
1267 | cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); |
1268 | if (cfd < 0) { | |
60d9771c LP |
1269 | if (errno == EAGAIN) |
1270 | return 0; | |
1271 | ||
4ff9bc2e LP |
1272 | if (ERRNO_IS_ACCEPT_AGAIN(errno)) |
1273 | continue; | |
1274 | ||
60d9771c LP |
1275 | return -errno; |
1276 | } | |
1277 | ||
4ff9bc2e | 1278 | safe_close(cfd); |
60d9771c LP |
1279 | } |
1280 | } | |
29206d46 LP |
1281 | |
1282 | struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) { | |
1283 | struct cmsghdr *cmsg; | |
1284 | ||
1285 | assert(mh); | |
1286 | ||
1287 | CMSG_FOREACH(cmsg, mh) | |
1288 | if (cmsg->cmsg_level == level && | |
1289 | cmsg->cmsg_type == type && | |
1290 | (length == (socklen_t) -1 || length == cmsg->cmsg_len)) | |
1291 | return cmsg; | |
1292 | ||
1293 | return NULL; | |
1294 | } | |
429b4350 LP |
1295 | |
1296 | int socket_ioctl_fd(void) { | |
1297 | int fd; | |
1298 | ||
1299 | /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for | |
1300 | * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not | |
1301 | * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more | |
1302 | * generic AF_NETLINK. */ | |
1303 | ||
1304 | fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
1305 | if (fd < 0) | |
1306 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); | |
1307 | if (fd < 0) | |
1308 | return -errno; | |
1309 | ||
1310 | return fd; | |
1311 | } | |
9f20fc28 LP |
1312 | |
1313 | int sockaddr_un_unlink(const struct sockaddr_un *sa) { | |
1314 | const char *p, * nul; | |
1315 | ||
1316 | assert(sa); | |
1317 | ||
1318 | if (sa->sun_family != AF_UNIX) | |
1319 | return -EPROTOTYPE; | |
1320 | ||
1321 | if (sa->sun_path[0] == 0) /* Nothing to do for abstract sockets */ | |
1322 | return 0; | |
1323 | ||
1324 | /* The path in .sun_path is not necessarily NUL terminated. Let's fix that. */ | |
1325 | nul = memchr(sa->sun_path, 0, sizeof(sa->sun_path)); | |
1326 | if (nul) | |
1327 | p = sa->sun_path; | |
1328 | else | |
1329 | p = memdupa_suffix0(sa->sun_path, sizeof(sa->sun_path)); | |
1330 | ||
1331 | if (unlink(p) < 0) | |
1332 | return -errno; | |
1333 | ||
1334 | return 1; | |
1335 | } | |
5cf91ea9 LP |
1336 | |
1337 | int sockaddr_un_set_path(struct sockaddr_un *ret, const char *path) { | |
1338 | size_t l; | |
1339 | ||
1340 | assert(ret); | |
1341 | assert(path); | |
1342 | ||
1343 | /* Initialize ret->sun_path from the specified argument. This will interpret paths starting with '@' as | |
1344 | * abstract namespace sockets, and those starting with '/' as regular filesystem sockets. It won't accept | |
1345 | * anything else (i.e. no relative paths), to avoid ambiguities. Note that this function cannot be used to | |
1346 | * reference paths in the abstract namespace that include NUL bytes in the name. */ | |
1347 | ||
1348 | l = strlen(path); | |
1349 | if (l == 0) | |
1350 | return -EINVAL; | |
1351 | if (!IN_SET(path[0], '/', '@')) | |
1352 | return -EINVAL; | |
1353 | if (path[1] == 0) | |
1354 | return -EINVAL; | |
1355 | ||
1356 | /* Don't allow paths larger than the space in sockaddr_un. Note that we are a tiny bit more restrictive than | |
1357 | * the kernel is: we insist on NUL termination (both for abstract namespace and regular file system socket | |
1358 | * addresses!), which the kernel doesn't. We do this to reduce chance of incompatibility with other apps that | |
1359 | * do not expect non-NUL terminated file system path*/ | |
1360 | if (l+1 > sizeof(ret->sun_path)) | |
1361 | return -EINVAL; | |
1362 | ||
1363 | *ret = (struct sockaddr_un) { | |
1364 | .sun_family = AF_UNIX, | |
1365 | }; | |
1366 | ||
1367 | if (path[0] == '@') { | |
1368 | /* Abstract namespace socket */ | |
1369 | memcpy(ret->sun_path + 1, path + 1, l); /* copy *with* trailing NUL byte */ | |
1370 | return (int) (offsetof(struct sockaddr_un, sun_path) + l); /* 🔥 *don't* 🔥 include trailing NUL in size */ | |
1371 | ||
1372 | } else { | |
1373 | assert(path[0] == '/'); | |
1374 | ||
1375 | /* File system socket */ | |
1376 | memcpy(ret->sun_path, path, l + 1); /* copy *with* trailing NUL byte */ | |
1377 | return (int) (offsetof(struct sockaddr_un, sun_path) + l + 1); /* include trailing NUL in size */ | |
1378 | } | |
1379 | } | |
5d594d01 LP |
1380 | |
1381 | int socket_bind_to_ifname(int fd, const char *ifname) { | |
1382 | assert(fd >= 0); | |
1383 | ||
1384 | /* Call with NULL to drop binding */ | |
1385 | ||
1386 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen_ptr(ifname)) < 0) | |
1387 | return -errno; | |
1388 | ||
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | int socket_bind_to_ifindex(int fd, int ifindex) { | |
518a66ec | 1393 | char ifname[IF_NAMESIZE + 1]; |
5d594d01 LP |
1394 | |
1395 | assert(fd >= 0); | |
1396 | ||
1397 | if (ifindex <= 0) { | |
1398 | /* Drop binding */ | |
1399 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, NULL, 0) < 0) | |
1400 | return -errno; | |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTOIFINDEX, &ifindex, sizeof(ifindex)) >= 0) | |
1406 | return 0; | |
1407 | if (errno != ENOPROTOOPT) | |
1408 | return -errno; | |
1409 | ||
1410 | /* Fall back to SO_BINDTODEVICE on kernels < 5.0 which didn't have SO_BINDTOIFINDEX */ | |
518a66ec | 1411 | if (!format_ifname(ifindex, ifname)) |
5d594d01 LP |
1412 | return -errno; |
1413 | ||
1414 | return socket_bind_to_ifname(fd, ifname); | |
1415 | } |