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Commit | Line | Data |
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064af421 | 1 | /* |
e731d71b | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc. |
064af421 | 3 | * |
a14bc59f BP |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
064af421 | 7 | * |
a14bc59f BP |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
064af421 BP |
15 | */ |
16 | ||
17 | #include <config.h> | |
18 | #include "socket-util.h" | |
19 | #include <arpa/inet.h> | |
20 | #include <errno.h> | |
21 | #include <fcntl.h> | |
f89ffb0e | 22 | #include <net/if.h> |
064af421 BP |
23 | #include <netdb.h> |
24 | #include <poll.h> | |
25 | #include <stddef.h> | |
26 | #include <stdio.h> | |
78ff0270 | 27 | #include <stdlib.h> |
064af421 | 28 | #include <string.h> |
259e0b1a | 29 | #include <sys/ioctl.h> |
3762274e BP |
30 | #include <sys/socket.h> |
31 | #include <sys/stat.h> | |
a7a27d07 | 32 | #include <sys/uio.h> |
064af421 BP |
33 | #include <sys/un.h> |
34 | #include <unistd.h> | |
f89ffb0e | 35 | #include "dynamic-string.h" |
064af421 | 36 | #include "fatal-signal.h" |
b26f46a4 | 37 | #include "ovs-thread.h" |
f89ffb0e | 38 | #include "packets.h" |
fd94a42c | 39 | #include "poll-loop.h" |
064af421 | 40 | #include "util.h" |
064af421 | 41 | #include "vlog.h" |
361906b1 | 42 | #if AF_PACKET && LINUX_DATAPATH |
f89ffb0e BP |
43 | #include <linux/if_packet.h> |
44 | #endif | |
45 | #ifdef HAVE_NETLINK | |
46 | #include "netlink-protocol.h" | |
47 | #include "netlink-socket.h" | |
48 | #endif | |
5136ce49 | 49 | |
d98e6007 | 50 | VLOG_DEFINE_THIS_MODULE(socket_util); |
064af421 | 51 | |
e61c056c BP |
52 | /* #ifdefs make it a pain to maintain code: you have to try to build both ways. |
53 | * Thus, this file compiles all of the code regardless of the target, by | |
361906b1 EJ |
54 | * writing "if (LINUX_DATAPATH)" instead of "#ifdef __linux__". */ |
55 | #ifndef LINUX_DATAPATH | |
56 | #define LINUX_DATAPATH 0 | |
e61c056c BP |
57 | #endif |
58 | ||
6e170b4c BP |
59 | #ifndef O_DIRECTORY |
60 | #define O_DIRECTORY 0 | |
61 | #endif | |
62 | ||
5b5d1836 YT |
63 | /* Maximum length of the sun_path member in a struct sockaddr_un, excluding |
64 | * space for a null terminator. */ | |
65 | #define MAX_UN_LEN (sizeof(((struct sockaddr_un *) 0)->sun_path) - 1) | |
66 | ||
c1c19657 BP |
67 | static int getsockopt_int(int fd, int level, int option, const char *optname, |
68 | int *valuep); | |
69 | ||
064af421 BP |
70 | /* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a |
71 | * positive errno value. */ | |
72 | int | |
73 | set_nonblocking(int fd) | |
74 | { | |
de8bd597 | 75 | #ifndef _WIN32 |
064af421 BP |
76 | int flags = fcntl(fd, F_GETFL, 0); |
77 | if (flags != -1) { | |
78 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != -1) { | |
79 | return 0; | |
80 | } else { | |
10a89ef0 | 81 | VLOG_ERR("fcntl(F_SETFL) failed: %s", ovs_strerror(errno)); |
064af421 BP |
82 | return errno; |
83 | } | |
84 | } else { | |
10a89ef0 | 85 | VLOG_ERR("fcntl(F_GETFL) failed: %s", ovs_strerror(errno)); |
064af421 BP |
86 | return errno; |
87 | } | |
de8bd597 GS |
88 | #else |
89 | unsigned long arg = 1; | |
90 | if (ioctlsocket(fd, FIONBIO, &arg)) { | |
91 | int error = sock_errno(); | |
92 | VLOG_ERR("set_nonblocking failed: %s", sock_strerror(error)); | |
93 | return error; | |
94 | } | |
95 | return 0; | |
96 | #endif | |
064af421 BP |
97 | } |
98 | ||
a0505c49 BP |
99 | void |
100 | xset_nonblocking(int fd) | |
101 | { | |
102 | if (set_nonblocking(fd)) { | |
103 | exit(EXIT_FAILURE); | |
104 | } | |
105 | } | |
106 | ||
6b9c1eab | 107 | int |
cea15768 EJ |
108 | set_dscp(int fd, uint8_t dscp) |
109 | { | |
eb0cb316 | 110 | int val; |
92ae5930 | 111 | bool success; |
eb0cb316 | 112 | |
cea15768 EJ |
113 | if (dscp > 63) { |
114 | return EINVAL; | |
115 | } | |
116 | ||
92ae5930 YT |
117 | /* Note: this function is used for both of IPv4 and IPv6 sockets */ |
118 | success = false; | |
eb0cb316 EM |
119 | val = dscp << 2; |
120 | if (setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val)) { | |
92ae5930 YT |
121 | if (sock_errno() != ENOPROTOOPT) { |
122 | return sock_errno(); | |
123 | } | |
124 | } else { | |
125 | success = true; | |
126 | } | |
127 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &val, sizeof val)) { | |
128 | if (sock_errno() != ENOPROTOOPT) { | |
129 | return sock_errno(); | |
130 | } | |
131 | } else { | |
132 | success = true; | |
133 | } | |
134 | if (!success) { | |
135 | return ENOPROTOOPT; | |
cea15768 EJ |
136 | } |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
2b35e147 BP |
141 | /* Translates 'host_name', which must be a string representation of an IP |
142 | * address, into a numeric IP address in '*addr'. Returns 0 if successful, | |
143 | * otherwise a positive errno value. */ | |
064af421 | 144 | int |
d295e8e9 | 145 | lookup_ip(const char *host_name, struct in_addr *addr) |
064af421 | 146 | { |
1bbd1728 | 147 | if (!inet_pton(AF_INET, host_name, addr)) { |
db5ce514 | 148 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); |
2b35e147 BP |
149 | VLOG_ERR_RL(&rl, "\"%s\" is not a valid IP address", host_name); |
150 | return ENOENT; | |
064af421 BP |
151 | } |
152 | return 0; | |
153 | } | |
154 | ||
d31f1109 JP |
155 | /* Translates 'host_name', which must be a string representation of an IPv6 |
156 | * address, into a numeric IPv6 address in '*addr'. Returns 0 if successful, | |
157 | * otherwise a positive errno value. */ | |
158 | int | |
159 | lookup_ipv6(const char *host_name, struct in6_addr *addr) | |
160 | { | |
161 | if (inet_pton(AF_INET6, host_name, addr) != 1) { | |
162 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
163 | VLOG_ERR_RL(&rl, "\"%s\" is not a valid IPv6 address", host_name); | |
164 | return ENOENT; | |
165 | } | |
166 | return 0; | |
167 | } | |
168 | ||
13f2ef97 BP |
169 | /* Translates 'host_name', which must be a host name or a string representation |
170 | * of an IP address, into a numeric IP address in '*addr'. Returns 0 if | |
171 | * successful, otherwise a positive errno value. | |
172 | * | |
173 | * Most Open vSwitch code should not use this because it causes deadlocks: | |
3cbb5dc7 | 174 | * getaddrinfo() sends out a DNS request but that starts a new flow for which |
13f2ef97 | 175 | * OVS must set up a flow, but it can't because it's waiting for a DNS reply. |
293d49bd | 176 | * The synchronous lookup also delays other activity. (Of course we can solve |
13f2ef97 BP |
177 | * this but it doesn't seem worthwhile quite yet.) */ |
178 | int | |
179 | lookup_hostname(const char *host_name, struct in_addr *addr) | |
180 | { | |
3cbb5dc7 BP |
181 | struct addrinfo *result; |
182 | struct addrinfo hints; | |
13f2ef97 | 183 | |
1bbd1728 | 184 | if (inet_pton(AF_INET, host_name, addr)) { |
13f2ef97 BP |
185 | return 0; |
186 | } | |
187 | ||
3cbb5dc7 BP |
188 | memset(&hints, 0, sizeof hints); |
189 | hints.ai_family = AF_INET; | |
190 | ||
191 | switch (getaddrinfo(host_name, NULL, &hints, &result)) { | |
192 | case 0: | |
db5a1019 AW |
193 | *addr = ALIGNED_CAST(struct sockaddr_in *, |
194 | result->ai_addr)->sin_addr; | |
3cbb5dc7 | 195 | freeaddrinfo(result); |
13f2ef97 | 196 | return 0; |
13f2ef97 | 197 | |
44f645a5 | 198 | #ifdef EAI_ADDRFAMILY |
3cbb5dc7 | 199 | case EAI_ADDRFAMILY: |
44f645a5 | 200 | #endif |
3cbb5dc7 BP |
201 | case EAI_NONAME: |
202 | case EAI_SERVICE: | |
203 | return ENOENT; | |
204 | ||
205 | case EAI_AGAIN: | |
206 | return EAGAIN; | |
207 | ||
208 | case EAI_BADFLAGS: | |
209 | case EAI_FAMILY: | |
210 | case EAI_SOCKTYPE: | |
211 | return EINVAL; | |
212 | ||
213 | case EAI_FAIL: | |
214 | return EIO; | |
215 | ||
216 | case EAI_MEMORY: | |
217 | return ENOMEM; | |
218 | ||
99ad8ba8 | 219 | #if defined (EAI_NODATA) && EAI_NODATA != EAI_NONAME |
3cbb5dc7 BP |
220 | case EAI_NODATA: |
221 | return ENXIO; | |
44f645a5 | 222 | #endif |
3cbb5dc7 | 223 | |
99ad8ba8 | 224 | #ifdef EAI_SYSTEM |
3cbb5dc7 | 225 | case EAI_SYSTEM: |
0f0b5401 | 226 | return sock_errno(); |
99ad8ba8 | 227 | #endif |
3cbb5dc7 BP |
228 | |
229 | default: | |
230 | return EPROTO; | |
231 | } | |
13f2ef97 BP |
232 | } |
233 | ||
064af421 | 234 | int |
d295e8e9 | 235 | check_connection_completion(int fd) |
064af421 | 236 | { |
d6cedfd9 | 237 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10); |
064af421 BP |
238 | struct pollfd pfd; |
239 | int retval; | |
240 | ||
241 | pfd.fd = fd; | |
242 | pfd.events = POLLOUT; | |
1bada7ab GS |
243 | |
244 | #ifndef _WIN32 | |
064af421 BP |
245 | do { |
246 | retval = poll(&pfd, 1, 0); | |
247 | } while (retval < 0 && errno == EINTR); | |
1bada7ab GS |
248 | #else |
249 | retval = WSAPoll(&pfd, 1, 0); | |
250 | #endif | |
064af421 | 251 | if (retval == 1) { |
d6cedfd9 | 252 | if (pfd.revents & POLLERR) { |
1bada7ab | 253 | ssize_t n = send(fd, "", 1, 0); |
d6cedfd9 | 254 | if (n < 0) { |
1bada7ab | 255 | return sock_errno(); |
d6cedfd9 BP |
256 | } else { |
257 | VLOG_ERR_RL(&rl, "poll return POLLERR but send succeeded"); | |
258 | return EPROTO; | |
259 | } | |
260 | } | |
261 | return 0; | |
064af421 | 262 | } else if (retval < 0) { |
1bada7ab | 263 | VLOG_ERR_RL(&rl, "poll: %s", sock_strerror(sock_errno())); |
064af421 BP |
264 | return errno; |
265 | } else { | |
266 | return EAGAIN; | |
267 | } | |
268 | } | |
269 | ||
5d5ffe9c | 270 | #ifndef _WIN32 |
064af421 BP |
271 | /* Drain all the data currently in the receive queue of a datagram socket (and |
272 | * possibly additional data). There is no way to know how many packets are in | |
273 | * the receive queue, but we do know that the total number of bytes queued does | |
274 | * not exceed the receive buffer size, so we pull packets until none are left | |
275 | * or we've read that many bytes. */ | |
276 | int | |
277 | drain_rcvbuf(int fd) | |
278 | { | |
c1c19657 | 279 | int rcvbuf; |
064af421 | 280 | |
c1c19657 BP |
281 | rcvbuf = get_socket_rcvbuf(fd); |
282 | if (rcvbuf < 0) { | |
283 | return -rcvbuf; | |
064af421 | 284 | } |
c1c19657 | 285 | |
064af421 BP |
286 | while (rcvbuf > 0) { |
287 | /* In Linux, specifying MSG_TRUNC in the flags argument causes the | |
288 | * datagram length to be returned, even if that is longer than the | |
289 | * buffer provided. Thus, we can use a 1-byte buffer to discard the | |
290 | * incoming datagram and still be able to account how many bytes were | |
291 | * removed from the receive buffer. | |
292 | * | |
293 | * On other Unix-like OSes, MSG_TRUNC has no effect in the flags | |
294 | * argument. */ | |
361906b1 | 295 | char buffer[LINUX_DATAPATH ? 1 : 2048]; |
5d5ffe9c GS |
296 | ssize_t n_bytes = recv(fd, buffer, sizeof buffer, |
297 | MSG_TRUNC | MSG_DONTWAIT); | |
064af421 BP |
298 | if (n_bytes <= 0 || n_bytes >= rcvbuf) { |
299 | break; | |
300 | } | |
301 | rcvbuf -= n_bytes; | |
302 | } | |
303 | return 0; | |
304 | } | |
5d5ffe9c | 305 | #endif |
064af421 | 306 | |
c1c19657 BP |
307 | /* Returns the size of socket 'sock''s receive buffer (SO_RCVBUF), or a |
308 | * negative errno value if an error occurs. */ | |
309 | int | |
310 | get_socket_rcvbuf(int sock) | |
311 | { | |
312 | int rcvbuf; | |
313 | int error; | |
314 | ||
315 | error = getsockopt_int(sock, SOL_SOCKET, SO_RCVBUF, "SO_RCVBUF", &rcvbuf); | |
316 | return error ? -error : rcvbuf; | |
317 | } | |
318 | ||
064af421 BP |
319 | /* Reads and discards up to 'n' datagrams from 'fd', stopping as soon as no |
320 | * more data can be immediately read. ('fd' should therefore be in | |
321 | * non-blocking mode.)*/ | |
322 | void | |
323 | drain_fd(int fd, size_t n_packets) | |
324 | { | |
325 | for (; n_packets > 0; n_packets--) { | |
326 | /* 'buffer' only needs to be 1 byte long in most circumstances. This | |
327 | * size is defensive against the possibility that we someday want to | |
328 | * use a Linux tap device without TUN_NO_PI, in which case a buffer | |
329 | * smaller than sizeof(struct tun_pi) will give EINVAL on read. */ | |
330 | char buffer[128]; | |
331 | if (read(fd, buffer, sizeof buffer) <= 0) { | |
332 | break; | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
7ff04d92 | 337 | #ifndef _WIN32 |
5b5d1836 YT |
338 | /* Attempts to shorten 'name' by opening a file descriptor for the directory |
339 | * part of the name and indirecting through /proc/self/fd/<dirfd>/<basename>. | |
340 | * On systems with Linux-like /proc, this works as long as <basename> isn't too | |
341 | * long. | |
342 | * | |
343 | * On success, returns 0 and stores the short name in 'short_name' and a | |
344 | * directory file descriptor to eventually be closed in '*dirfpd'. */ | |
345 | static int | |
346 | shorten_name_via_proc(const char *name, char short_name[MAX_UN_LEN + 1], | |
347 | int *dirfdp) | |
064af421 | 348 | { |
5b5d1836 YT |
349 | char *dir, *base; |
350 | int dirfd; | |
351 | int len; | |
352 | ||
353 | if (!LINUX_DATAPATH) { | |
354 | return ENAMETOOLONG; | |
355 | } | |
356 | ||
357 | dir = dir_name(name); | |
358 | dirfd = open(dir, O_DIRECTORY | O_RDONLY); | |
359 | if (dirfd < 0) { | |
360 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1); | |
361 | int error = errno; | |
362 | ||
363 | VLOG_WARN_RL(&rl, "%s: open failed (%s)", dir, ovs_strerror(error)); | |
364 | free(dir); | |
365 | ||
366 | return error; | |
367 | } | |
368 | free(dir); | |
369 | ||
370 | base = base_name(name); | |
371 | len = snprintf(short_name, MAX_UN_LEN + 1, | |
372 | "/proc/self/fd/%d/%s", dirfd, base); | |
373 | free(base); | |
374 | ||
375 | if (len >= 0 && len <= MAX_UN_LEN) { | |
376 | *dirfdp = dirfd; | |
377 | return 0; | |
378 | } else { | |
379 | close(dirfd); | |
380 | return ENAMETOOLONG; | |
381 | } | |
382 | } | |
383 | ||
384 | /* Attempts to shorten 'name' by creating a symlink for the directory part of | |
385 | * the name and indirecting through <symlink>/<basename>. This works on | |
386 | * systems that support symlinks, as long as <basename> isn't too long. | |
387 | * | |
388 | * On success, returns 0 and stores the short name in 'short_name' and the | |
389 | * symbolic link to eventually delete in 'linkname'. */ | |
390 | static int | |
391 | shorten_name_via_symlink(const char *name, char short_name[MAX_UN_LEN + 1], | |
392 | char linkname[MAX_UN_LEN + 1]) | |
393 | { | |
394 | char *abs, *dir, *base; | |
395 | const char *tmpdir; | |
396 | int error; | |
397 | int i; | |
398 | ||
399 | abs = abs_file_name(NULL, name); | |
400 | dir = dir_name(abs); | |
401 | base = base_name(abs); | |
402 | free(abs); | |
403 | ||
404 | tmpdir = getenv("TMPDIR"); | |
405 | if (tmpdir == NULL) { | |
406 | tmpdir = "/tmp"; | |
407 | } | |
408 | ||
409 | for (i = 0; i < 1000; i++) { | |
410 | int len; | |
411 | ||
412 | len = snprintf(linkname, MAX_UN_LEN + 1, | |
413 | "%s/ovs-un-c-%"PRIu32, tmpdir, random_uint32()); | |
414 | error = (len < 0 || len > MAX_UN_LEN ? ENAMETOOLONG | |
415 | : symlink(dir, linkname) ? errno | |
416 | : 0); | |
417 | if (error != EEXIST) { | |
418 | break; | |
419 | } | |
420 | } | |
421 | ||
422 | if (!error) { | |
423 | int len; | |
424 | ||
425 | fatal_signal_add_file_to_unlink(linkname); | |
426 | ||
427 | len = snprintf(short_name, MAX_UN_LEN + 1, "%s/%s", linkname, base); | |
428 | if (len < 0 || len > MAX_UN_LEN) { | |
429 | fatal_signal_unlink_file_now(linkname); | |
430 | error = ENAMETOOLONG; | |
431 | } | |
432 | } | |
433 | ||
434 | if (error) { | |
435 | linkname[0] = '\0'; | |
436 | } | |
437 | free(dir); | |
438 | free(base); | |
439 | ||
440 | return error; | |
064af421 BP |
441 | } |
442 | ||
6e170b4c BP |
443 | /* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in |
444 | * '*un_len' the size of the sockaddr_un. | |
445 | * | |
5b5d1836 YT |
446 | * Returns 0 on success, otherwise a positive errno value. |
447 | * | |
448 | * Uses '*dirfdp' and 'linkname' to store references to data when the caller no | |
449 | * longer needs to use 'un'. On success, freeing these references with | |
450 | * free_sockaddr_un() is mandatory to avoid a leak; on failure, freeing them is | |
451 | * unnecessary but harmless. */ | |
6e170b4c BP |
452 | static int |
453 | make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len, | |
5b5d1836 | 454 | int *dirfdp, char linkname[MAX_UN_LEN + 1]) |
6e170b4c | 455 | { |
5b5d1836 | 456 | char short_name[MAX_UN_LEN + 1]; |
6e170b4c BP |
457 | |
458 | *dirfdp = -1; | |
5b5d1836 | 459 | linkname[0] = '\0'; |
6e170b4c | 460 | if (strlen(name) > MAX_UN_LEN) { |
5b5d1836 YT |
461 | /* 'name' is too long to fit in a sockaddr_un. Try a workaround. */ |
462 | int error = shorten_name_via_proc(name, short_name, dirfdp); | |
463 | if (error == ENAMETOOLONG) { | |
464 | error = shorten_name_via_symlink(name, short_name, linkname); | |
465 | } | |
466 | if (error) { | |
467 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1); | |
6e170b4c BP |
468 | |
469 | VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum " | |
34582733 | 470 | "%"PRIuSIZE" bytes", name, MAX_UN_LEN); |
5b5d1836 | 471 | return error; |
6e170b4c BP |
472 | } |
473 | ||
5b5d1836 YT |
474 | name = short_name; |
475 | } | |
476 | ||
477 | un->sun_family = AF_UNIX; | |
478 | ovs_strzcpy(un->sun_path, name, sizeof un->sun_path); | |
479 | *un_len = (offsetof(struct sockaddr_un, sun_path) | |
480 | + strlen (un->sun_path) + 1); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | /* Clean up after make_sockaddr_un(). */ | |
485 | static void | |
486 | free_sockaddr_un(int dirfd, const char *linkname) | |
487 | { | |
488 | if (dirfd >= 0) { | |
489 | close(dirfd); | |
490 | } | |
491 | if (linkname[0]) { | |
492 | fatal_signal_unlink_file_now(linkname); | |
6e170b4c BP |
493 | } |
494 | } | |
495 | ||
e2bd0593 BP |
496 | /* Binds Unix domain socket 'fd' to a file with permissions 0700. */ |
497 | static int | |
498 | bind_unix_socket(int fd, struct sockaddr *sun, socklen_t sun_len) | |
499 | { | |
e2bd0593 BP |
500 | /* According to _Unix Network Programming_, umask should affect bind(). */ |
501 | mode_t old_umask = umask(0077); | |
502 | int error = bind(fd, sun, sun_len) ? errno : 0; | |
503 | umask(old_umask); | |
504 | return error; | |
e2bd0593 BP |
505 | } |
506 | ||
064af421 BP |
507 | /* Creates a Unix domain socket in the given 'style' (either SOCK_DGRAM or |
508 | * SOCK_STREAM) that is bound to '*bind_path' (if 'bind_path' is non-null) and | |
509 | * connected to '*connect_path' (if 'connect_path' is non-null). If 'nonblock' | |
5ca92d1d | 510 | * is true, the socket is made non-blocking. |
064af421 BP |
511 | * |
512 | * Returns the socket's fd if successful, otherwise a negative errno value. */ | |
513 | int | |
5ca92d1d | 514 | make_unix_socket(int style, bool nonblock, |
064af421 BP |
515 | const char *bind_path, const char *connect_path) |
516 | { | |
517 | int error; | |
518 | int fd; | |
519 | ||
520 | fd = socket(PF_UNIX, style, 0); | |
521 | if (fd < 0) { | |
522 | return -errno; | |
523 | } | |
524 | ||
525 | /* Set nonblocking mode right away, if we want it. This prevents blocking | |
526 | * in connect(), if connect_path != NULL. (In turn, that's a corner case: | |
527 | * it will only happen if style is SOCK_STREAM or SOCK_SEQPACKET, and only | |
528 | * if a backlog of un-accepted connections has built up in the kernel.) */ | |
529 | if (nonblock) { | |
b36db114 BP |
530 | error = set_nonblocking(fd); |
531 | if (error) { | |
064af421 BP |
532 | goto error; |
533 | } | |
534 | } | |
535 | ||
536 | if (bind_path) { | |
5b5d1836 | 537 | char linkname[MAX_UN_LEN + 1]; |
064af421 BP |
538 | struct sockaddr_un un; |
539 | socklen_t un_len; | |
6e170b4c BP |
540 | int dirfd; |
541 | ||
542 | if (unlink(bind_path) && errno != ENOENT) { | |
10a89ef0 BP |
543 | VLOG_WARN("unlinking \"%s\": %s\n", |
544 | bind_path, ovs_strerror(errno)); | |
064af421 BP |
545 | } |
546 | fatal_signal_add_file_to_unlink(bind_path); | |
6e170b4c | 547 | |
5b5d1836 | 548 | error = make_sockaddr_un(bind_path, &un, &un_len, &dirfd, linkname); |
e2bd0593 BP |
549 | if (!error) { |
550 | error = bind_unix_socket(fd, (struct sockaddr *) &un, un_len); | |
6e170b4c | 551 | } |
5b5d1836 YT |
552 | free_sockaddr_un(dirfd, linkname); |
553 | ||
6e170b4c | 554 | if (error) { |
064af421 BP |
555 | goto error; |
556 | } | |
557 | } | |
558 | ||
559 | if (connect_path) { | |
5b5d1836 | 560 | char linkname[MAX_UN_LEN + 1]; |
064af421 BP |
561 | struct sockaddr_un un; |
562 | socklen_t un_len; | |
6e170b4c BP |
563 | int dirfd; |
564 | ||
5b5d1836 | 565 | error = make_sockaddr_un(connect_path, &un, &un_len, &dirfd, linkname); |
6e170b4c BP |
566 | if (!error |
567 | && connect(fd, (struct sockaddr*) &un, un_len) | |
064af421 | 568 | && errno != EINPROGRESS) { |
6e170b4c BP |
569 | error = errno; |
570 | } | |
5b5d1836 YT |
571 | free_sockaddr_un(dirfd, linkname); |
572 | ||
6e170b4c | 573 | if (error) { |
064af421 BP |
574 | goto error; |
575 | } | |
576 | } | |
577 | ||
064af421 BP |
578 | return fd; |
579 | ||
580 | error: | |
6e170b4c BP |
581 | if (error == EAGAIN) { |
582 | error = EPROTO; | |
583 | } | |
064af421 | 584 | if (bind_path) { |
e36d0b53 | 585 | fatal_signal_unlink_file_now(bind_path); |
064af421 | 586 | } |
064af421 BP |
587 | close(fd); |
588 | return -error; | |
589 | } | |
590 | ||
591 | int | |
592 | get_unix_name_len(socklen_t sun_len) | |
593 | { | |
594 | return (sun_len >= offsetof(struct sockaddr_un, sun_path) | |
595 | ? sun_len - offsetof(struct sockaddr_un, sun_path) | |
596 | : 0); | |
597 | } | |
7ff04d92 | 598 | #endif /* _WIN32 */ |
064af421 | 599 | |
dbba996b BP |
600 | ovs_be32 |
601 | guess_netmask(ovs_be32 ip_) | |
064af421 | 602 | { |
dbba996b | 603 | uint32_t ip = ntohl(ip_); |
064af421 BP |
604 | return ((ip >> 31) == 0 ? htonl(0xff000000) /* Class A */ |
605 | : (ip >> 30) == 2 ? htonl(0xffff0000) /* Class B */ | |
606 | : (ip >> 29) == 6 ? htonl(0xffffff00) /* Class C */ | |
607 | : htonl(0)); /* ??? */ | |
608 | } | |
609 | ||
e731d71b | 610 | /* This is like strsep() except: |
4f2eb9a7 | 611 | * |
e731d71b AS |
612 | * - The separator string is ":". |
613 | * | |
614 | * - Square brackets [] quote ":" separators and are removed from the | |
615 | * tokens. */ | |
616 | static char * | |
617 | parse_bracketed_token(char **pp) | |
78ff0270 | 618 | { |
e731d71b AS |
619 | char *p = *pp; |
620 | ||
621 | if (p == NULL) { | |
622 | return NULL; | |
623 | } else if (*p == '\0') { | |
624 | *pp = NULL; | |
625 | return p; | |
626 | } else if (*p == '[') { | |
627 | char *start = p + 1; | |
628 | char *end = start + strcspn(start, "]"); | |
629 | *pp = (*end == '\0' ? NULL | |
630 | : end[1] == ':' ? end + 2 | |
631 | : end + 1); | |
632 | *end = '\0'; | |
633 | return start; | |
634 | } else { | |
635 | char *start = p; | |
636 | char *end = start + strcspn(start, ":"); | |
637 | *pp = *end == '\0' ? NULL : end + 1; | |
638 | *end = '\0'; | |
639 | return start; | |
78ff0270 | 640 | } |
e731d71b | 641 | } |
78ff0270 | 642 | |
e731d71b AS |
643 | static bool |
644 | parse_sockaddr_components(struct sockaddr_storage *ss, | |
645 | const char *host_s, | |
646 | const char *port_s, uint16_t default_port, | |
647 | const char *s) | |
648 | { | |
649 | struct sockaddr_in *sin = ALIGNED_CAST(struct sockaddr_in *, ss); | |
650 | int port; | |
651 | ||
652 | if (port_s && port_s[0]) { | |
653 | if (!str_to_int(port_s, 10, &port) || port < 0 || port > 65535) { | |
654 | VLOG_ERR("%s: bad port number \"%s\"", s, port_s); | |
655 | } | |
656 | } else { | |
657 | port = default_port; | |
78ff0270 | 658 | } |
e731d71b AS |
659 | |
660 | memset(ss, 0, sizeof *ss); | |
661 | if (strchr(host_s, ':')) { | |
662 | struct sockaddr_in6 *sin6 | |
663 | = ALIGNED_CAST(struct sockaddr_in6 *, ss); | |
664 | ||
665 | sin6->sin6_family = AF_INET6; | |
666 | sin6->sin6_port = htons(port); | |
667 | if (!inet_pton(AF_INET6, host_s, sin6->sin6_addr.s6_addr)) { | |
668 | VLOG_ERR("%s: bad IPv6 address \"%s\"", s, host_s); | |
669 | goto exit; | |
670 | } | |
671 | } else { | |
672 | sin->sin_family = AF_INET; | |
673 | sin->sin_port = htons(port); | |
674 | if (!inet_pton(AF_INET, host_s, &sin->sin_addr.s_addr)) { | |
675 | VLOG_ERR("%s: bad IPv4 address \"%s\"", s, host_s); | |
676 | goto exit; | |
677 | } | |
52f8a75e BP |
678 | } |
679 | ||
e731d71b | 680 | return true; |
52f8a75e BP |
681 | |
682 | exit: | |
e731d71b AS |
683 | memset(ss, 0, sizeof *ss); |
684 | return false; | |
685 | } | |
686 | ||
687 | /* Parses 'target', which should be a string in the format "<host>[:<port>]". | |
688 | * <host>, which is required, may be an IPv4 address or an IPv6 address | |
689 | * enclosed in square brackets. If 'default_port' is nonzero then <port> is | |
690 | * optional and defaults to 'default_port'. | |
691 | * | |
692 | * On success, returns true and stores the parsed remote address into '*ss'. | |
693 | * On failure, logs an error, stores zeros into '*ss', and returns false. */ | |
694 | bool | |
695 | inet_parse_active(const char *target_, uint16_t default_port, | |
696 | struct sockaddr_storage *ss) | |
697 | { | |
698 | char *target = xstrdup(target_); | |
699 | const char *port; | |
700 | const char *host; | |
701 | char *p; | |
702 | bool ok; | |
703 | ||
704 | p = target; | |
705 | host = parse_bracketed_token(&p); | |
706 | port = parse_bracketed_token(&p); | |
707 | if (!host) { | |
708 | VLOG_ERR("%s: host must be specified", target_); | |
709 | ok = false; | |
710 | } else if (!port && !default_port) { | |
711 | VLOG_ERR("%s: port must be specified", target_); | |
712 | ok = false; | |
713 | } else { | |
714 | ok = parse_sockaddr_components(ss, host, port, default_port, target_); | |
715 | } | |
52f8a75e | 716 | if (!ok) { |
e731d71b | 717 | memset(ss, 0, sizeof *ss); |
52f8a75e BP |
718 | } |
719 | free(target); | |
720 | return ok; | |
721 | } | |
722 | ||
e731d71b AS |
723 | |
724 | /* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style' and | |
725 | * connects to 'target', which should be a string in the format | |
726 | * "<host>[:<port>]". <host>, which is required, may be an IPv4 address or an | |
727 | * IPv6 address enclosed in square brackets. If 'default_port' is nonzero then | |
728 | * <port> is optional and defaults to 'default_port'. | |
52f8a75e BP |
729 | * |
730 | * 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP). | |
731 | * | |
732 | * On success, returns 0 (indicating connection complete) or EAGAIN (indicating | |
733 | * connection in progress), in which case the new file descriptor is stored | |
734 | * into '*fdp'. On failure, returns a positive errno value other than EAGAIN | |
735 | * and stores -1 into '*fdp'. | |
736 | * | |
e731d71b | 737 | * If 'ss' is non-null, then on success stores the target address into '*ss'. |
f125905c | 738 | * |
cea15768 EJ |
739 | * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It |
740 | * should be in the range [0, 63] and will automatically be shifted to the | |
741 | * appropriately place in the IP tos field. */ | |
52f8a75e BP |
742 | int |
743 | inet_open_active(int style, const char *target, uint16_t default_port, | |
e731d71b | 744 | struct sockaddr_storage *ssp, int *fdp, uint8_t dscp) |
52f8a75e | 745 | { |
e731d71b | 746 | struct sockaddr_storage ss; |
52f8a75e BP |
747 | int fd = -1; |
748 | int error; | |
749 | ||
750 | /* Parse. */ | |
e731d71b | 751 | if (!inet_parse_active(target, default_port, &ss)) { |
1901968e BP |
752 | error = EAFNOSUPPORT; |
753 | goto exit; | |
78ff0270 BP |
754 | } |
755 | ||
756 | /* Create non-blocking socket. */ | |
e731d71b | 757 | fd = socket(ss.ss_family, style, 0); |
78ff0270 | 758 | if (fd < 0) { |
0f0b5401 GS |
759 | error = sock_errno(); |
760 | VLOG_ERR("%s: socket: %s", target, sock_strerror(error)); | |
78ff0270 BP |
761 | goto exit; |
762 | } | |
763 | error = set_nonblocking(fd); | |
764 | if (error) { | |
a4efa3fc | 765 | goto exit; |
78ff0270 BP |
766 | } |
767 | ||
e731d71b AS |
768 | /* The dscp bits must be configured before connect() to ensure that the |
769 | * TOS field is set during the connection establishment. If set after | |
cea15768 EJ |
770 | * connect(), the handshake SYN frames will be sent with a TOS of 0. */ |
771 | error = set_dscp(fd, dscp); | |
772 | if (error) { | |
909dad2b | 773 | VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error)); |
ef8a3d14 | 774 | goto exit; |
f125905c MM |
775 | } |
776 | ||
78ff0270 | 777 | /* Connect. */ |
e731d71b AS |
778 | error = connect(fd, (struct sockaddr *) &ss, ss_length(&ss)) == 0 |
779 | ? 0 | |
0f0b5401 GS |
780 | : sock_errno(); |
781 | if (error == EINPROGRESS | |
782 | #ifdef _WIN32 | |
783 | || error == WSAEALREADY || error == WSAEWOULDBLOCK | |
784 | #endif | |
785 | ) { | |
78ff0270 | 786 | error = EAGAIN; |
78ff0270 BP |
787 | } |
788 | ||
78ff0270 | 789 | exit: |
e731d71b AS |
790 | if (error && error != EAGAIN) { |
791 | if (ssp) { | |
792 | memset(ssp, 0, sizeof *ssp); | |
793 | } | |
794 | if (fd >= 0) { | |
7009a594 | 795 | closesocket(fd); |
e731d71b AS |
796 | fd = -1; |
797 | } | |
798 | } else { | |
799 | if (ssp) { | |
800 | *ssp = ss; | |
78ff0270 | 801 | } |
78ff0270 | 802 | } |
a4efa3fc | 803 | *fdp = fd; |
78ff0270 BP |
804 | return error; |
805 | } | |
806 | ||
e731d71b | 807 | /* Parses 'target', which should be a string in the format "[<port>][:<host>]": |
e1bd3bee BP |
808 | * |
809 | * - If 'default_port' is -1, then <port> is required. Otherwise, if | |
810 | * <port> is omitted, then 'default_port' is used instead. | |
811 | * | |
812 | * - If <port> (or 'default_port', if used) is 0, then no port is bound | |
813 | * and the TCP/IP stack will select a port. | |
814 | * | |
e731d71b AS |
815 | * - <host> is optional. If supplied, it may be an IPv4 address or an |
816 | * IPv6 address enclosed in square brackets. If omitted, the IP address | |
817 | * is wildcarded. | |
4f2eb9a7 | 818 | * |
e731d71b AS |
819 | * If successful, stores the address into '*ss' and returns true; otherwise |
820 | * zeros '*ss' and returns false. */ | |
d98fa503 | 821 | bool |
995337c4 | 822 | inet_parse_passive(const char *target_, int default_port, |
e731d71b | 823 | struct sockaddr_storage *ss) |
78ff0270 BP |
824 | { |
825 | char *target = xstrdup(target_); | |
e731d71b AS |
826 | const char *port; |
827 | const char *host; | |
828 | char *p; | |
829 | bool ok; | |
830 | ||
831 | p = target; | |
832 | port = parse_bracketed_token(&p); | |
833 | host = parse_bracketed_token(&p); | |
834 | if (!port && default_port < 0) { | |
835 | VLOG_ERR("%s: port must be specified", target_); | |
836 | ok = false; | |
837 | } else { | |
838 | ok = parse_sockaddr_components(ss, host ? host : "0.0.0.0", | |
839 | port, default_port, target_); | |
d98fa503 | 840 | } |
d98fa503 | 841 | if (!ok) { |
e731d71b | 842 | memset(ss, 0, sizeof *ss); |
d98fa503 BP |
843 | } |
844 | free(target); | |
845 | return ok; | |
846 | } | |
847 | ||
848 | ||
e731d71b | 849 | /* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style', binds to |
d98fa503 BP |
850 | * 'target', and listens for incoming connections. Parses 'target' in the same |
851 | * way was inet_parse_passive(). | |
852 | * | |
853 | * 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP). | |
854 | * | |
855 | * For TCP, the socket will have SO_REUSEADDR turned on. | |
856 | * | |
857 | * On success, returns a non-negative file descriptor. On failure, returns a | |
858 | * negative errno value. | |
859 | * | |
e731d71b | 860 | * If 'ss' is non-null, then on success stores the bound address into '*ss'. |
f125905c | 861 | * |
cea15768 EJ |
862 | * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It |
863 | * should be in the range [0, 63] and will automatically be shifted to the | |
864 | * appropriately place in the IP tos field. */ | |
d98fa503 BP |
865 | int |
866 | inet_open_passive(int style, const char *target, int default_port, | |
e731d71b | 867 | struct sockaddr_storage *ssp, uint8_t dscp) |
d98fa503 | 868 | { |
df451457 | 869 | bool kernel_chooses_port; |
e731d71b | 870 | struct sockaddr_storage ss; |
d98fa503 BP |
871 | int fd = 0, error; |
872 | unsigned int yes = 1; | |
873 | ||
e731d71b | 874 | if (!inet_parse_passive(target, default_port, &ss)) { |
ca286ba9 | 875 | return -EAFNOSUPPORT; |
78ff0270 | 876 | } |
e731d71b | 877 | kernel_chooses_port = ss_get_port(&ss) == 0; |
78ff0270 BP |
878 | |
879 | /* Create non-blocking socket, set SO_REUSEADDR. */ | |
e731d71b | 880 | fd = socket(ss.ss_family, style, 0); |
78ff0270 | 881 | if (fd < 0) { |
0f0b5401 GS |
882 | error = sock_errno(); |
883 | VLOG_ERR("%s: socket: %s", target, sock_strerror(error)); | |
ca286ba9 | 884 | return -error; |
78ff0270 BP |
885 | } |
886 | error = set_nonblocking(fd); | |
887 | if (error) { | |
d98fa503 | 888 | goto error; |
78ff0270 | 889 | } |
4f2eb9a7 BP |
890 | if (style == SOCK_STREAM |
891 | && setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) { | |
0f0b5401 | 892 | error = sock_errno(); |
10a89ef0 | 893 | VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", |
0f0b5401 | 894 | target, sock_strerror(error)); |
d98fa503 | 895 | goto error; |
78ff0270 BP |
896 | } |
897 | ||
898 | /* Bind. */ | |
e731d71b | 899 | if (bind(fd, (struct sockaddr *) &ss, ss_length(&ss)) < 0) { |
0f0b5401 GS |
900 | error = sock_errno(); |
901 | VLOG_ERR("%s: bind: %s", target, sock_strerror(error)); | |
d98fa503 | 902 | goto error; |
78ff0270 BP |
903 | } |
904 | ||
cea15768 EJ |
905 | /* The dscp bits must be configured before connect() to ensure that the TOS |
906 | * field is set during the connection establishment. If set after | |
907 | * connect(), the handshake SYN frames will be sent with a TOS of 0. */ | |
908 | error = set_dscp(fd, dscp); | |
909 | if (error) { | |
909dad2b | 910 | VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error)); |
ef8a3d14 | 911 | goto error; |
f125905c MM |
912 | } |
913 | ||
78ff0270 | 914 | /* Listen. */ |
041dc07f | 915 | if (style == SOCK_STREAM && listen(fd, 10) < 0) { |
0f0b5401 GS |
916 | error = sock_errno(); |
917 | VLOG_ERR("%s: listen: %s", target, sock_strerror(error)); | |
d98fa503 | 918 | goto error; |
78ff0270 | 919 | } |
36775dad | 920 | |
e731d71b AS |
921 | if (ssp || kernel_chooses_port) { |
922 | socklen_t ss_len = sizeof ss; | |
923 | if (getsockname(fd, (struct sockaddr *) &ss, &ss_len) < 0) { | |
0f0b5401 GS |
924 | error = sock_errno(); |
925 | VLOG_ERR("%s: getsockname: %s", target, sock_strerror(error)); | |
d98fa503 | 926 | goto error; |
36775dad | 927 | } |
df451457 BP |
928 | if (kernel_chooses_port) { |
929 | VLOG_INFO("%s: listening on port %"PRIu16, | |
e731d71b AS |
930 | target, ss_get_port(&ss)); |
931 | } | |
932 | if (ssp) { | |
933 | *ssp = ss; | |
df451457 | 934 | } |
36775dad BP |
935 | } |
936 | ||
d98fa503 | 937 | return fd; |
78ff0270 | 938 | |
d98fa503 | 939 | error: |
e731d71b AS |
940 | if (ssp) { |
941 | memset(ssp, 0, sizeof *ssp); | |
942 | } | |
7009a594 | 943 | closesocket(fd); |
ca286ba9 | 944 | return -error; |
78ff0270 BP |
945 | } |
946 | ||
064af421 BP |
947 | int |
948 | read_fully(int fd, void *p_, size_t size, size_t *bytes_read) | |
949 | { | |
950 | uint8_t *p = p_; | |
951 | ||
952 | *bytes_read = 0; | |
953 | while (size > 0) { | |
954 | ssize_t retval = read(fd, p, size); | |
955 | if (retval > 0) { | |
956 | *bytes_read += retval; | |
957 | size -= retval; | |
958 | p += retval; | |
959 | } else if (retval == 0) { | |
960 | return EOF; | |
961 | } else if (errno != EINTR) { | |
962 | return errno; | |
963 | } | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | ||
968 | int | |
969 | write_fully(int fd, const void *p_, size_t size, size_t *bytes_written) | |
970 | { | |
971 | const uint8_t *p = p_; | |
972 | ||
973 | *bytes_written = 0; | |
974 | while (size > 0) { | |
975 | ssize_t retval = write(fd, p, size); | |
976 | if (retval > 0) { | |
977 | *bytes_written += retval; | |
978 | size -= retval; | |
979 | p += retval; | |
980 | } else if (retval == 0) { | |
981 | VLOG_WARN("write returned 0"); | |
982 | return EPROTO; | |
983 | } else if (errno != EINTR) { | |
984 | return errno; | |
985 | } | |
986 | } | |
987 | return 0; | |
988 | } | |
8e71cf88 BP |
989 | |
990 | /* Given file name 'file_name', fsyncs the directory in which it is contained. | |
991 | * Returns 0 if successful, otherwise a positive errno value. */ | |
992 | int | |
993 | fsync_parent_dir(const char *file_name) | |
994 | { | |
995 | int error = 0; | |
cbf414e5 | 996 | #ifndef _WIN32 |
8e71cf88 BP |
997 | char *dir; |
998 | int fd; | |
999 | ||
1000 | dir = dir_name(file_name); | |
1001 | fd = open(dir, O_RDONLY); | |
1002 | if (fd >= 0) { | |
1003 | if (fsync(fd)) { | |
1004 | if (errno == EINVAL || errno == EROFS) { | |
1005 | /* This directory does not support synchronization. Not | |
1006 | * really an error. */ | |
1007 | } else { | |
1008 | error = errno; | |
10a89ef0 | 1009 | VLOG_ERR("%s: fsync failed (%s)", dir, ovs_strerror(error)); |
8e71cf88 BP |
1010 | } |
1011 | } | |
1012 | close(fd); | |
1013 | } else { | |
1014 | error = errno; | |
10a89ef0 | 1015 | VLOG_ERR("%s: open failed (%s)", dir, ovs_strerror(error)); |
8e71cf88 BP |
1016 | } |
1017 | free(dir); | |
cbf414e5 | 1018 | #endif |
8e71cf88 BP |
1019 | |
1020 | return error; | |
1021 | } | |
26efd256 BP |
1022 | |
1023 | /* Obtains the modification time of the file named 'file_name' to the greatest | |
1024 | * supported precision. If successful, stores the mtime in '*mtime' and | |
1025 | * returns 0. On error, returns a positive errno value and stores zeros in | |
1026 | * '*mtime'. */ | |
1027 | int | |
1028 | get_mtime(const char *file_name, struct timespec *mtime) | |
1029 | { | |
1030 | struct stat s; | |
1031 | ||
1032 | if (!stat(file_name, &s)) { | |
1033 | mtime->tv_sec = s.st_mtime; | |
1034 | ||
1035 | #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC | |
1036 | mtime->tv_nsec = s.st_mtim.tv_nsec; | |
1037 | #elif HAVE_STRUCT_STAT_ST_MTIMENSEC | |
1038 | mtime->tv_nsec = s.st_mtimensec; | |
1039 | #else | |
1040 | mtime->tv_nsec = 0; | |
1041 | #endif | |
1042 | ||
1043 | return 0; | |
1044 | } else { | |
1045 | mtime->tv_sec = mtime->tv_nsec = 0; | |
1046 | return errno; | |
1047 | } | |
1048 | } | |
1049 | ||
a19a3a9f | 1050 | #ifndef _WIN32 |
279c9e03 BP |
1051 | void |
1052 | xpipe(int fds[2]) | |
1053 | { | |
1054 | if (pipe(fds)) { | |
10a89ef0 | 1055 | VLOG_FATAL("failed to create pipe (%s)", ovs_strerror(errno)); |
279c9e03 BP |
1056 | } |
1057 | } | |
f89ffb0e | 1058 | |
c0d95206 EM |
1059 | void |
1060 | xpipe_nonblocking(int fds[2]) | |
1061 | { | |
1062 | xpipe(fds); | |
1063 | xset_nonblocking(fds[0]); | |
1064 | xset_nonblocking(fds[1]); | |
1065 | } | |
a19a3a9f | 1066 | #endif |
c0d95206 | 1067 | |
f89ffb0e | 1068 | static int |
c1c19657 | 1069 | getsockopt_int(int fd, int level, int option, const char *optname, int *valuep) |
f89ffb0e | 1070 | { |
c1c19657 BP |
1071 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10); |
1072 | socklen_t len; | |
1073 | int value; | |
1074 | int error; | |
f89ffb0e | 1075 | |
c1c19657 BP |
1076 | len = sizeof value; |
1077 | if (getsockopt(fd, level, option, &value, &len)) { | |
0f0b5401 GS |
1078 | error = sock_errno(); |
1079 | VLOG_ERR_RL(&rl, "getsockopt(%s): %s", optname, sock_strerror(error)); | |
c1c19657 BP |
1080 | } else if (len != sizeof value) { |
1081 | error = EINVAL; | |
34582733 | 1082 | VLOG_ERR_RL(&rl, "getsockopt(%s): value is %u bytes (expected %"PRIuSIZE")", |
c1c19657 BP |
1083 | optname, (unsigned int) len, sizeof value); |
1084 | } else { | |
1085 | error = 0; | |
1086 | } | |
1087 | ||
1088 | *valuep = error ? 0 : value; | |
1089 | return error; | |
f89ffb0e BP |
1090 | } |
1091 | ||
1092 | static void | |
1093 | describe_sockaddr(struct ds *string, int fd, | |
1094 | int (*getaddr)(int, struct sockaddr *, socklen_t *)) | |
1095 | { | |
1096 | struct sockaddr_storage ss; | |
1097 | socklen_t len = sizeof ss; | |
1098 | ||
1099 | if (!getaddr(fd, (struct sockaddr *) &ss, &len)) { | |
e731d71b AS |
1100 | if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6) { |
1101 | char addrbuf[SS_NTOP_BUFSIZE]; | |
f89ffb0e | 1102 | |
e731d71b AS |
1103 | ds_put_format(string, "%s:%"PRIu16, |
1104 | ss_format_address(&ss, addrbuf, sizeof addrbuf), | |
1105 | ss_get_port(&ss)); | |
7ff04d92 | 1106 | #ifndef _WIN32 |
f89ffb0e BP |
1107 | } else if (ss.ss_family == AF_UNIX) { |
1108 | struct sockaddr_un sun; | |
1109 | const char *null; | |
1110 | size_t maxlen; | |
1111 | ||
1112 | memcpy(&sun, &ss, sizeof sun); | |
1113 | maxlen = len - offsetof(struct sockaddr_un, sun_path); | |
1114 | null = memchr(sun.sun_path, '\0', maxlen); | |
1115 | ds_put_buffer(string, sun.sun_path, | |
1116 | null ? null - sun.sun_path : maxlen); | |
7ff04d92 | 1117 | #endif |
f89ffb0e BP |
1118 | } |
1119 | #ifdef HAVE_NETLINK | |
1120 | else if (ss.ss_family == AF_NETLINK) { | |
1121 | int protocol; | |
1122 | ||
1123 | /* SO_PROTOCOL was introduced in 2.6.32. Support it regardless of the version | |
1124 | * of the Linux kernel headers in use at build time. */ | |
1125 | #ifndef SO_PROTOCOL | |
1126 | #define SO_PROTOCOL 38 | |
1127 | #endif | |
1128 | ||
c1c19657 BP |
1129 | if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, "SO_PROTOCOL", |
1130 | &protocol)) { | |
f89ffb0e BP |
1131 | switch (protocol) { |
1132 | case NETLINK_ROUTE: | |
1133 | ds_put_cstr(string, "NETLINK_ROUTE"); | |
1134 | break; | |
1135 | ||
1136 | case NETLINK_GENERIC: | |
1137 | ds_put_cstr(string, "NETLINK_GENERIC"); | |
1138 | break; | |
1139 | ||
1140 | default: | |
1141 | ds_put_format(string, "AF_NETLINK family %d", protocol); | |
1142 | break; | |
1143 | } | |
1144 | } else { | |
1145 | ds_put_cstr(string, "AF_NETLINK"); | |
1146 | } | |
1147 | } | |
1148 | #endif | |
361906b1 | 1149 | #if AF_PACKET && LINUX_DATAPATH |
f89ffb0e BP |
1150 | else if (ss.ss_family == AF_PACKET) { |
1151 | struct sockaddr_ll sll; | |
1152 | ||
1153 | memcpy(&sll, &ss, sizeof sll); | |
1154 | ds_put_cstr(string, "AF_PACKET"); | |
1155 | if (sll.sll_ifindex) { | |
1156 | char name[IFNAMSIZ]; | |
1157 | ||
1158 | if (if_indextoname(sll.sll_ifindex, name)) { | |
1159 | ds_put_format(string, "(%s)", name); | |
1160 | } else { | |
1161 | ds_put_format(string, "(ifindex=%d)", sll.sll_ifindex); | |
1162 | } | |
1163 | } | |
1164 | if (sll.sll_protocol) { | |
1165 | ds_put_format(string, "(protocol=0x%"PRIu16")", | |
1166 | ntohs(sll.sll_protocol)); | |
1167 | } | |
1168 | } | |
1169 | #endif | |
1170 | else if (ss.ss_family == AF_UNSPEC) { | |
1171 | ds_put_cstr(string, "AF_UNSPEC"); | |
1172 | } else { | |
1173 | ds_put_format(string, "AF_%d", (int) ss.ss_family); | |
1174 | } | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | ||
361906b1 | 1179 | #ifdef LINUX_DATAPATH |
f89ffb0e BP |
1180 | static void |
1181 | put_fd_filename(struct ds *string, int fd) | |
1182 | { | |
1183 | char buf[1024]; | |
1184 | char *linkname; | |
1185 | int n; | |
1186 | ||
1187 | linkname = xasprintf("/proc/self/fd/%d", fd); | |
1188 | n = readlink(linkname, buf, sizeof buf); | |
1189 | if (n > 0) { | |
1190 | ds_put_char(string, ' '); | |
1191 | ds_put_buffer(string, buf, n); | |
1192 | if (n > sizeof buf) { | |
1193 | ds_put_cstr(string, "..."); | |
1194 | } | |
1195 | } | |
1196 | free(linkname); | |
1197 | } | |
1198 | #endif | |
1199 | ||
1200 | /* Returns a malloc()'d string describing 'fd', for use in logging. */ | |
1201 | char * | |
1202 | describe_fd(int fd) | |
1203 | { | |
1204 | struct ds string; | |
1205 | struct stat s; | |
1206 | ||
1207 | ds_init(&string); | |
54a1cfb5 | 1208 | #ifndef _WIN32 |
f89ffb0e | 1209 | if (fstat(fd, &s)) { |
10a89ef0 | 1210 | ds_put_format(&string, "fstat failed (%s)", ovs_strerror(errno)); |
f89ffb0e BP |
1211 | } else if (S_ISSOCK(s.st_mode)) { |
1212 | describe_sockaddr(&string, fd, getsockname); | |
1213 | ds_put_cstr(&string, "<->"); | |
1214 | describe_sockaddr(&string, fd, getpeername); | |
1215 | } else { | |
1216 | ds_put_cstr(&string, (isatty(fd) ? "tty" | |
1217 | : S_ISDIR(s.st_mode) ? "directory" | |
1218 | : S_ISCHR(s.st_mode) ? "character device" | |
1219 | : S_ISBLK(s.st_mode) ? "block device" | |
1220 | : S_ISREG(s.st_mode) ? "file" | |
1221 | : S_ISFIFO(s.st_mode) ? "FIFO" | |
1222 | : S_ISLNK(s.st_mode) ? "symbolic link" | |
1223 | : "unknown")); | |
361906b1 | 1224 | #ifdef LINUX_DATAPATH |
f89ffb0e BP |
1225 | put_fd_filename(&string, fd); |
1226 | #endif | |
1227 | } | |
54a1cfb5 GS |
1228 | #else |
1229 | ds_put_format(&string,"file descriptor"); | |
1230 | #endif /* _WIN32 */ | |
f89ffb0e BP |
1231 | return ds_steal_cstr(&string); |
1232 | } | |
fd94a42c | 1233 | |
866f3e67 | 1234 | #ifndef _WIN32 |
259e0b1a BP |
1235 | /* Calls ioctl() on an AF_INET sock, passing the specified 'command' and |
1236 | * 'arg'. Returns 0 if successful, otherwise a positive errno value. */ | |
1237 | int | |
1238 | af_inet_ioctl(unsigned long int command, const void *arg) | |
1239 | { | |
1240 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; | |
1241 | static int sock; | |
1242 | ||
1243 | if (ovsthread_once_start(&once)) { | |
1244 | sock = socket(AF_INET, SOCK_DGRAM, 0); | |
1245 | if (sock < 0) { | |
0f0b5401 GS |
1246 | int error = sock_errno(); |
1247 | VLOG_ERR("failed to create inet socket: %s", sock_strerror(error)); | |
1248 | sock = -error; | |
259e0b1a BP |
1249 | } |
1250 | ovsthread_once_done(&once); | |
1251 | } | |
1252 | ||
1253 | return (sock < 0 ? -sock | |
1254 | : ioctl(sock, command, arg) == -1 ? errno | |
1255 | : 0); | |
1256 | } | |
1257 | ||
1258 | int | |
1259 | af_inet_ifreq_ioctl(const char *name, struct ifreq *ifr, unsigned long int cmd, | |
1260 | const char *cmd_name) | |
1261 | { | |
1262 | int error; | |
1263 | ||
1264 | ovs_strzcpy(ifr->ifr_name, name, sizeof ifr->ifr_name); | |
1265 | error = af_inet_ioctl(cmd, ifr); | |
1266 | if (error) { | |
1267 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1268 | VLOG_DBG_RL(&rl, "%s: ioctl(%s) failed: %s", name, cmd_name, | |
1269 | ovs_strerror(error)); | |
1270 | } | |
1271 | return error; | |
1272 | } | |
866f3e67 | 1273 | #endif |
e731d71b AS |
1274 | \f |
1275 | /* sockaddr_storage helpers. */ | |
259e0b1a | 1276 | |
e731d71b AS |
1277 | /* Returns the IPv4 or IPv6 port in 'ss'. */ |
1278 | uint16_t | |
1279 | ss_get_port(const struct sockaddr_storage *ss) | |
1280 | { | |
1281 | if (ss->ss_family == AF_INET) { | |
1282 | const struct sockaddr_in *sin | |
1283 | = ALIGNED_CAST(const struct sockaddr_in *, ss); | |
1284 | return ntohs(sin->sin_port); | |
1285 | } else if (ss->ss_family == AF_INET6) { | |
1286 | const struct sockaddr_in6 *sin6 | |
1287 | = ALIGNED_CAST(const struct sockaddr_in6 *, ss); | |
1288 | return ntohs(sin6->sin6_port); | |
1289 | } else { | |
1290 | OVS_NOT_REACHED(); | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | /* Formats the IPv4 or IPv6 address in 'ss' into the 'bufsize' bytes in 'buf'. | |
1295 | * If 'ss' is an IPv6 address, puts square brackets around the address. | |
1296 | * 'bufsize' should be at least SS_NTOP_BUFSIZE. | |
1297 | * | |
1298 | * Returns 'buf'. */ | |
1299 | char * | |
1300 | ss_format_address(const struct sockaddr_storage *ss, | |
1301 | char *buf, size_t bufsize) | |
1302 | { | |
1303 | ovs_assert(bufsize >= SS_NTOP_BUFSIZE); | |
1304 | if (ss->ss_family == AF_INET) { | |
1305 | const struct sockaddr_in *sin | |
1306 | = ALIGNED_CAST(const struct sockaddr_in *, ss); | |
1307 | ||
1308 | snprintf(buf, bufsize, IP_FMT, IP_ARGS(sin->sin_addr.s_addr)); | |
1309 | } else if (ss->ss_family == AF_INET6) { | |
1310 | const struct sockaddr_in6 *sin6 | |
1311 | = ALIGNED_CAST(const struct sockaddr_in6 *, ss); | |
1312 | ||
1313 | buf[0] = '['; | |
1314 | inet_ntop(AF_INET6, sin6->sin6_addr.s6_addr, buf + 1, bufsize - 1); | |
1315 | strcpy(strchr(buf, '\0'), "]"); | |
1316 | } else { | |
1317 | OVS_NOT_REACHED(); | |
1318 | } | |
1319 | ||
1320 | return buf; | |
1321 | } | |
1322 | ||
1323 | size_t | |
1324 | ss_length(const struct sockaddr_storage *ss) | |
1325 | { | |
1326 | switch (ss->ss_family) { | |
1327 | case AF_INET: | |
1328 | return sizeof(struct sockaddr_in); | |
1329 | ||
1330 | case AF_INET6: | |
1331 | return sizeof(struct sockaddr_in6); | |
1332 | ||
1333 | default: | |
1334 | OVS_NOT_REACHED(); | |
1335 | } | |
1336 | } | |
b26f46a4 GS |
1337 | |
1338 | /* For Windows socket calls, 'errno' is not set. One has to call | |
1339 | * WSAGetLastError() to get the error number and then pass it to | |
315ea327 GS |
1340 | * this function to get the correct error string. |
1341 | * | |
b26f46a4 GS |
1342 | * ovs_strerror() calls strerror_r() and would not get the correct error |
1343 | * string for Windows sockets, but is good for POSIX. */ | |
1344 | const char * | |
1345 | sock_strerror(int error) | |
1346 | { | |
1347 | #ifdef _WIN32 | |
315ea327 | 1348 | return ovs_format_message(error); |
b26f46a4 GS |
1349 | #else |
1350 | return ovs_strerror(error); | |
1351 | #endif | |
1352 | } |