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Commit | Line | Data |
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912b54ad DS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 David Strauss | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
912b54ad | 20 | #include <errno.h> |
3f6fd1ba | 21 | #include <fcntl.h> |
912b54ad | 22 | #include <getopt.h> |
3f6fd1ba | 23 | #include <netdb.h> |
912b54ad DS |
24 | #include <stdio.h> |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
912b54ad DS |
27 | #include <sys/socket.h> |
28 | #include <sys/un.h> | |
29 | #include <unistd.h> | |
30 | ||
912b54ad DS |
31 | #include "sd-daemon.h" |
32 | #include "sd-event.h" | |
fb69d709 | 33 | #include "sd-resolve.h" |
3f6fd1ba | 34 | |
b5efdb8a | 35 | #include "alloc-util.h" |
3ffd4af2 | 36 | #include "fd-util.h" |
96c374d0 | 37 | #include "log.h" |
3f6fd1ba LP |
38 | #include "path-util.h" |
39 | #include "set.h" | |
912b54ad | 40 | #include "socket-util.h" |
07630cea | 41 | #include "string-util.h" |
dc3b8afb | 42 | #include "parse-util.h" |
912b54ad | 43 | #include "util.h" |
8569a776 LP |
44 | |
45 | #define BUFFER_SIZE (256 * 1024) | |
dc3b8afb | 46 | static unsigned arg_connections_max = 256; |
912b54ad | 47 | |
fb69d709 LP |
48 | static const char *arg_remote_host = NULL; |
49 | ||
8569a776 | 50 | typedef struct Context { |
fb69d709 LP |
51 | sd_event *event; |
52 | sd_resolve *resolve; | |
53 | ||
8569a776 LP |
54 | Set *listen; |
55 | Set *connections; | |
56 | } Context; | |
912b54ad | 57 | |
8569a776 | 58 | typedef struct Connection { |
e633ea1c LP |
59 | Context *context; |
60 | ||
8569a776 LP |
61 | int server_fd, client_fd; |
62 | int server_to_client_buffer[2]; /* a pipe */ | |
63 | int client_to_server_buffer[2]; /* a pipe */ | |
912b54ad | 64 | |
8569a776 LP |
65 | size_t server_to_client_buffer_full, client_to_server_buffer_full; |
66 | size_t server_to_client_buffer_size, client_to_server_buffer_size; | |
67 | ||
68 | sd_event_source *server_event_source, *client_event_source; | |
912b54ad | 69 | |
fb69d709 LP |
70 | sd_resolve_query *resolve_query; |
71 | } Connection; | |
912b54ad | 72 | |
8569a776 LP |
73 | static void connection_free(Connection *c) { |
74 | assert(c); | |
32d3c809 | 75 | |
e633ea1c LP |
76 | if (c->context) |
77 | set_remove(c->context->connections, c); | |
78 | ||
8569a776 LP |
79 | sd_event_source_unref(c->server_event_source); |
80 | sd_event_source_unref(c->client_event_source); | |
32d3c809 | 81 | |
03e334a1 LP |
82 | safe_close(c->server_fd); |
83 | safe_close(c->client_fd); | |
32d3c809 | 84 | |
3d94f76c LP |
85 | safe_close_pair(c->server_to_client_buffer); |
86 | safe_close_pair(c->client_to_server_buffer); | |
32d3c809 | 87 | |
fb69d709 LP |
88 | sd_resolve_query_unref(c->resolve_query); |
89 | ||
8569a776 LP |
90 | free(c); |
91 | } | |
32d3c809 | 92 | |
8569a776 LP |
93 | static void context_free(Context *context) { |
94 | sd_event_source *es; | |
95 | Connection *c; | |
96 | ||
97 | assert(context); | |
98 | ||
99 | while ((es = set_steal_first(context->listen))) | |
100 | sd_event_source_unref(es); | |
101 | ||
e633ea1c | 102 | while ((c = set_first(context->connections))) |
8569a776 LP |
103 | connection_free(c); |
104 | ||
105 | set_free(context->listen); | |
106 | set_free(context->connections); | |
32d3c809 | 107 | |
fb69d709 LP |
108 | sd_event_unref(context->event); |
109 | sd_resolve_unref(context->resolve); | |
8569a776 | 110 | } |
912b54ad | 111 | |
8569a776 LP |
112 | static int connection_create_pipes(Connection *c, int buffer[2], size_t *sz) { |
113 | int r; | |
912b54ad | 114 | |
8569a776 LP |
115 | assert(c); |
116 | assert(buffer); | |
117 | assert(sz); | |
912b54ad | 118 | |
8569a776 LP |
119 | if (buffer[0] >= 0) |
120 | return 0; | |
912b54ad | 121 | |
8569a776 | 122 | r = pipe2(buffer, O_CLOEXEC|O_NONBLOCK); |
4a62c710 MS |
123 | if (r < 0) |
124 | return log_error_errno(errno, "Failed to allocate pipe buffer: %m"); | |
912b54ad | 125 | |
25dbe4f5 | 126 | (void) fcntl(buffer[0], F_SETPIPE_SZ, BUFFER_SIZE); |
8569a776 LP |
127 | |
128 | r = fcntl(buffer[0], F_GETPIPE_SZ); | |
4a62c710 MS |
129 | if (r < 0) |
130 | return log_error_errno(errno, "Failed to get pipe buffer size: %m"); | |
912b54ad | 131 | |
8569a776 LP |
132 | assert(r > 0); |
133 | *sz = r; | |
134 | ||
912b54ad DS |
135 | return 0; |
136 | } | |
137 | ||
8569a776 LP |
138 | static int connection_shovel( |
139 | Connection *c, | |
140 | int *from, int buffer[2], int *to, | |
141 | size_t *full, size_t *sz, | |
142 | sd_event_source **from_source, sd_event_source **to_source) { | |
143 | ||
144 | bool shoveled; | |
145 | ||
146 | assert(c); | |
147 | assert(from); | |
148 | assert(buffer); | |
149 | assert(buffer[0] >= 0); | |
150 | assert(buffer[1] >= 0); | |
151 | assert(to); | |
152 | assert(full); | |
153 | assert(sz); | |
154 | assert(from_source); | |
155 | assert(to_source); | |
156 | ||
157 | do { | |
158 | ssize_t z; | |
159 | ||
160 | shoveled = false; | |
161 | ||
162 | if (*full < *sz && *from >= 0 && *to >= 0) { | |
163 | z = splice(*from, NULL, buffer[1], NULL, *sz - *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
164 | if (z > 0) { | |
165 | *full += z; | |
166 | shoveled = true; | |
4c701096 | 167 | } else if (z == 0 || IN_SET(errno, EPIPE, ECONNRESET)) { |
8569a776 | 168 | *from_source = sd_event_source_unref(*from_source); |
03e334a1 | 169 | *from = safe_close(*from); |
ec2ce0c5 | 170 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 171 | return log_error_errno(errno, "Failed to splice: %m"); |
912b54ad DS |
172 | } |
173 | ||
8569a776 LP |
174 | if (*full > 0 && *to >= 0) { |
175 | z = splice(buffer[0], NULL, *to, NULL, *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
176 | if (z > 0) { | |
177 | *full -= z; | |
178 | shoveled = true; | |
4c701096 | 179 | } else if (z == 0 || IN_SET(errno, EPIPE, ECONNRESET)) { |
8569a776 | 180 | *to_source = sd_event_source_unref(*to_source); |
03e334a1 | 181 | *to = safe_close(*to); |
ec2ce0c5 | 182 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 183 | return log_error_errno(errno, "Failed to splice: %m"); |
8569a776 LP |
184 | } |
185 | } while (shoveled); | |
912b54ad | 186 | |
8569a776 | 187 | return 0; |
912b54ad DS |
188 | } |
189 | ||
fb69d709 | 190 | static int connection_enable_event_sources(Connection *c); |
8569a776 LP |
191 | |
192 | static int traffic_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
193 | Connection *c = userdata; | |
912b54ad DS |
194 | int r; |
195 | ||
8569a776 LP |
196 | assert(s); |
197 | assert(fd >= 0); | |
198 | assert(c); | |
912b54ad | 199 | |
8569a776 LP |
200 | r = connection_shovel(c, |
201 | &c->server_fd, c->server_to_client_buffer, &c->client_fd, | |
202 | &c->server_to_client_buffer_full, &c->server_to_client_buffer_size, | |
203 | &c->server_event_source, &c->client_event_source); | |
204 | if (r < 0) | |
205 | goto quit; | |
912b54ad | 206 | |
8569a776 LP |
207 | r = connection_shovel(c, |
208 | &c->client_fd, c->client_to_server_buffer, &c->server_fd, | |
209 | &c->client_to_server_buffer_full, &c->client_to_server_buffer_size, | |
210 | &c->client_event_source, &c->server_event_source); | |
211 | if (r < 0) | |
212 | goto quit; | |
912b54ad | 213 | |
8569a776 LP |
214 | /* EOF on both sides? */ |
215 | if (c->server_fd == -1 && c->client_fd == -1) | |
216 | goto quit; | |
912b54ad | 217 | |
8569a776 LP |
218 | /* Server closed, and all data written to client? */ |
219 | if (c->server_fd == -1 && c->server_to_client_buffer_full <= 0) | |
220 | goto quit; | |
912b54ad | 221 | |
8569a776 LP |
222 | /* Client closed, and all data written to server? */ |
223 | if (c->client_fd == -1 && c->client_to_server_buffer_full <= 0) | |
224 | goto quit; | |
912b54ad | 225 | |
fb69d709 | 226 | r = connection_enable_event_sources(c); |
8569a776 LP |
227 | if (r < 0) |
228 | goto quit; | |
912b54ad | 229 | |
8569a776 | 230 | return 1; |
912b54ad | 231 | |
8569a776 LP |
232 | quit: |
233 | connection_free(c); | |
234 | return 0; /* ignore errors, continue serving */ | |
912b54ad DS |
235 | } |
236 | ||
fb69d709 | 237 | static int connection_enable_event_sources(Connection *c) { |
8569a776 LP |
238 | uint32_t a = 0, b = 0; |
239 | int r; | |
912b54ad | 240 | |
8569a776 | 241 | assert(c); |
912b54ad | 242 | |
8569a776 LP |
243 | if (c->server_to_client_buffer_full > 0) |
244 | b |= EPOLLOUT; | |
245 | if (c->server_to_client_buffer_full < c->server_to_client_buffer_size) | |
246 | a |= EPOLLIN; | |
912b54ad | 247 | |
8569a776 LP |
248 | if (c->client_to_server_buffer_full > 0) |
249 | a |= EPOLLOUT; | |
250 | if (c->client_to_server_buffer_full < c->client_to_server_buffer_size) | |
251 | b |= EPOLLIN; | |
912b54ad | 252 | |
8569a776 LP |
253 | if (c->server_event_source) |
254 | r = sd_event_source_set_io_events(c->server_event_source, a); | |
255 | else if (c->server_fd >= 0) | |
fb69d709 | 256 | r = sd_event_add_io(c->context->event, &c->server_event_source, c->server_fd, a, traffic_cb, c); |
8569a776 LP |
257 | else |
258 | r = 0; | |
259 | ||
f647962d MS |
260 | if (r < 0) |
261 | return log_error_errno(r, "Failed to set up server event source: %m"); | |
912b54ad | 262 | |
8569a776 LP |
263 | if (c->client_event_source) |
264 | r = sd_event_source_set_io_events(c->client_event_source, b); | |
265 | else if (c->client_fd >= 0) | |
fb69d709 | 266 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, b, traffic_cb, c); |
8569a776 LP |
267 | else |
268 | r = 0; | |
912b54ad | 269 | |
f647962d MS |
270 | if (r < 0) |
271 | return log_error_errno(r, "Failed to set up client event source: %m"); | |
912b54ad | 272 | |
8569a776 | 273 | return 0; |
912b54ad DS |
274 | } |
275 | ||
fb69d709 LP |
276 | static int connection_complete(Connection *c) { |
277 | int r; | |
278 | ||
279 | assert(c); | |
280 | ||
281 | r = connection_create_pipes(c, c->server_to_client_buffer, &c->server_to_client_buffer_size); | |
282 | if (r < 0) | |
283 | goto fail; | |
284 | ||
285 | r = connection_create_pipes(c, c->client_to_server_buffer, &c->client_to_server_buffer_size); | |
286 | if (r < 0) | |
287 | goto fail; | |
288 | ||
289 | r = connection_enable_event_sources(c); | |
290 | if (r < 0) | |
291 | goto fail; | |
292 | ||
293 | return 0; | |
294 | ||
295 | fail: | |
296 | connection_free(c); | |
297 | return 0; /* ignore errors, continue serving */ | |
298 | } | |
299 | ||
8569a776 LP |
300 | static int connect_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
301 | Connection *c = userdata; | |
302 | socklen_t solen; | |
303 | int error, r; | |
304 | ||
305 | assert(s); | |
306 | assert(fd >= 0); | |
307 | assert(c); | |
308 | ||
309 | solen = sizeof(error); | |
310 | r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &solen); | |
311 | if (r < 0) { | |
56f64d95 | 312 | log_error_errno(errno, "Failed to issue SO_ERROR: %m"); |
40976028 DS |
313 | goto fail; |
314 | } | |
912b54ad | 315 | |
8569a776 | 316 | if (error != 0) { |
279d3c9c | 317 | log_error_errno(error, "Failed to connect to remote host: %m"); |
912b54ad DS |
318 | goto fail; |
319 | } | |
320 | ||
8569a776 LP |
321 | c->client_event_source = sd_event_source_unref(c->client_event_source); |
322 | ||
fb69d709 | 323 | return connection_complete(c); |
912b54ad | 324 | |
fb69d709 LP |
325 | fail: |
326 | connection_free(c); | |
327 | return 0; /* ignore errors, continue serving */ | |
328 | } | |
912b54ad | 329 | |
fb69d709 LP |
330 | static int connection_start(Connection *c, struct sockaddr *sa, socklen_t salen) { |
331 | int r; | |
332 | ||
333 | assert(c); | |
334 | assert(sa); | |
335 | assert(salen); | |
336 | ||
337 | c->client_fd = socket(sa->sa_family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
338 | if (c->client_fd < 0) { | |
56f64d95 | 339 | log_error_errno(errno, "Failed to get remote socket: %m"); |
8569a776 | 340 | goto fail; |
fb69d709 LP |
341 | } |
342 | ||
343 | r = connect(c->client_fd, sa, salen); | |
344 | if (r < 0) { | |
345 | if (errno == EINPROGRESS) { | |
346 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, EPOLLOUT, connect_cb, c); | |
347 | if (r < 0) { | |
da927ba9 | 348 | log_error_errno(r, "Failed to add connection socket: %m"); |
fb69d709 LP |
349 | goto fail; |
350 | } | |
351 | ||
352 | r = sd_event_source_set_enabled(c->client_event_source, SD_EVENT_ONESHOT); | |
353 | if (r < 0) { | |
da927ba9 | 354 | log_error_errno(r, "Failed to enable oneshot event source: %m"); |
fb69d709 LP |
355 | goto fail; |
356 | } | |
357 | } else { | |
56f64d95 | 358 | log_error_errno(errno, "Failed to connect to remote host: %m"); |
fb69d709 LP |
359 | goto fail; |
360 | } | |
361 | } else { | |
362 | r = connection_complete(c); | |
363 | if (r < 0) | |
364 | goto fail; | |
365 | } | |
912b54ad | 366 | |
8569a776 | 367 | return 0; |
912b54ad | 368 | |
8569a776 LP |
369 | fail: |
370 | connection_free(c); | |
371 | return 0; /* ignore errors, continue serving */ | |
372 | } | |
373 | ||
fb69d709 LP |
374 | static int resolve_cb(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { |
375 | Connection *c = userdata; | |
376 | ||
377 | assert(q); | |
378 | assert(c); | |
379 | ||
380 | if (ret != 0) { | |
381 | log_error("Failed to resolve host: %s", gai_strerror(ret)); | |
382 | goto fail; | |
383 | } | |
384 | ||
385 | c->resolve_query = sd_resolve_query_unref(c->resolve_query); | |
386 | ||
387 | return connection_start(c, ai->ai_addr, ai->ai_addrlen); | |
388 | ||
389 | fail: | |
390 | connection_free(c); | |
391 | return 0; /* ignore errors, continue serving */ | |
392 | } | |
393 | ||
394 | static int resolve_remote(Connection *c) { | |
395 | ||
396 | static const struct addrinfo hints = { | |
397 | .ai_family = AF_UNSPEC, | |
398 | .ai_socktype = SOCK_STREAM, | |
399 | .ai_flags = AI_ADDRCONFIG | |
400 | }; | |
401 | ||
1ec6af16 | 402 | union sockaddr_union sa = {}; |
fb69d709 | 403 | const char *node, *service; |
fb69d709 LP |
404 | int r; |
405 | ||
406 | if (path_is_absolute(arg_remote_host)) { | |
407 | sa.un.sun_family = AF_UNIX; | |
fc2fffe7 LP |
408 | strncpy(sa.un.sun_path, arg_remote_host, sizeof(sa.un.sun_path)); |
409 | return connection_start(c, &sa.sa, SOCKADDR_UN_LEN(sa.un)); | |
fb69d709 LP |
410 | } |
411 | ||
412 | if (arg_remote_host[0] == '@') { | |
413 | sa.un.sun_family = AF_UNIX; | |
414 | sa.un.sun_path[0] = 0; | |
fc2fffe7 LP |
415 | strncpy(sa.un.sun_path+1, arg_remote_host+1, sizeof(sa.un.sun_path)-1); |
416 | return connection_start(c, &sa.sa, SOCKADDR_UN_LEN(sa.un)); | |
fb69d709 LP |
417 | } |
418 | ||
419 | service = strrchr(arg_remote_host, ':'); | |
420 | if (service) { | |
421 | node = strndupa(arg_remote_host, service - arg_remote_host); | |
313cefa1 | 422 | service++; |
fb69d709 LP |
423 | } else { |
424 | node = arg_remote_host; | |
425 | service = "80"; | |
426 | } | |
427 | ||
428 | log_debug("Looking up address info for %s:%s", node, service); | |
429 | r = sd_resolve_getaddrinfo(c->context->resolve, &c->resolve_query, node, service, &hints, resolve_cb, c); | |
430 | if (r < 0) { | |
da927ba9 | 431 | log_error_errno(r, "Failed to resolve remote host: %m"); |
fb69d709 LP |
432 | goto fail; |
433 | } | |
434 | ||
435 | return 0; | |
436 | ||
437 | fail: | |
438 | connection_free(c); | |
439 | return 0; /* ignore errors, continue serving */ | |
440 | } | |
441 | ||
442 | static int add_connection_socket(Context *context, int fd) { | |
8569a776 LP |
443 | Connection *c; |
444 | int r; | |
445 | ||
446 | assert(context); | |
8569a776 LP |
447 | assert(fd >= 0); |
448 | ||
dc3b8afb | 449 | if (set_size(context->connections) > arg_connections_max) { |
8569a776 | 450 | log_warning("Hit connection limit, refusing connection."); |
03e334a1 | 451 | safe_close(fd); |
8569a776 | 452 | return 0; |
912b54ad DS |
453 | } |
454 | ||
d5099efc | 455 | r = set_ensure_allocated(&context->connections, NULL); |
fb69d709 LP |
456 | if (r < 0) { |
457 | log_oom(); | |
458 | return 0; | |
459 | } | |
912b54ad | 460 | |
8569a776 | 461 | c = new0(Connection, 1); |
fb69d709 LP |
462 | if (!c) { |
463 | log_oom(); | |
464 | return 0; | |
465 | } | |
8569a776 | 466 | |
e633ea1c | 467 | c->context = context; |
8569a776 LP |
468 | c->server_fd = fd; |
469 | c->client_fd = -1; | |
470 | c->server_to_client_buffer[0] = c->server_to_client_buffer[1] = -1; | |
471 | c->client_to_server_buffer[0] = c->client_to_server_buffer[1] = -1; | |
472 | ||
e633ea1c LP |
473 | r = set_put(context->connections, c); |
474 | if (r < 0) { | |
475 | free(c); | |
fb69d709 LP |
476 | log_oom(); |
477 | return 0; | |
8569a776 | 478 | } |
912b54ad | 479 | |
fb69d709 | 480 | return resolve_remote(c); |
40976028 DS |
481 | } |
482 | ||
483 | static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
7b77ed8c | 484 | _cleanup_free_ char *peer = NULL; |
8569a776 LP |
485 | Context *context = userdata; |
486 | int nfd = -1, r; | |
40976028 | 487 | |
8569a776 LP |
488 | assert(s); |
489 | assert(fd >= 0); | |
40976028 | 490 | assert(revents & EPOLLIN); |
8569a776 LP |
491 | assert(context); |
492 | ||
493 | nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
7b77ed8c LP |
494 | if (nfd < 0) { |
495 | if (errno != -EAGAIN) | |
56f64d95 | 496 | log_warning_errno(errno, "Failed to accept() socket: %m"); |
7b77ed8c | 497 | } else { |
366b7db4 | 498 | getpeername_pretty(nfd, true, &peer); |
8569a776 | 499 | log_debug("New connection from %s", strna(peer)); |
40976028 | 500 | |
fb69d709 | 501 | r = add_connection_socket(context, nfd); |
f4bd42aa | 502 | if (r < 0) { |
da927ba9 | 503 | log_error_errno(r, "Failed to accept connection, ignoring: %m"); |
03e334a1 | 504 | safe_close(fd); |
f4bd42aa | 505 | } |
7b77ed8c | 506 | } |
8569a776 | 507 | |
40976028 DS |
508 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); |
509 | if (r < 0) { | |
da927ba9 | 510 | log_error_errno(r, "Error while re-enabling listener with ONESHOT: %m"); |
fb69d709 | 511 | sd_event_exit(context->event, r); |
40976028 DS |
512 | return r; |
513 | } | |
514 | ||
96c374d0 | 515 | return 1; |
912b54ad DS |
516 | } |
517 | ||
fb69d709 | 518 | static int add_listen_socket(Context *context, int fd) { |
8569a776 LP |
519 | sd_event_source *source; |
520 | int r; | |
521 | ||
522 | assert(context); | |
8569a776 | 523 | assert(fd >= 0); |
912b54ad | 524 | |
d5099efc | 525 | r = set_ensure_allocated(&context->listen, NULL); |
96c374d0 | 526 | if (r < 0) { |
8569a776 LP |
527 | log_oom(); |
528 | return r; | |
529 | } | |
530 | ||
531 | r = sd_is_socket(fd, 0, SOCK_STREAM, 1); | |
f647962d MS |
532 | if (r < 0) |
533 | return log_error_errno(r, "Failed to determine socket type: %m"); | |
8569a776 LP |
534 | if (r == 0) { |
535 | log_error("Passed in socket is not a stream socket."); | |
536 | return -EINVAL; | |
537 | } | |
912b54ad | 538 | |
8569a776 | 539 | r = fd_nonblock(fd, true); |
f647962d MS |
540 | if (r < 0) |
541 | return log_error_errno(r, "Failed to mark file descriptor non-blocking: %m"); | |
912b54ad | 542 | |
fb69d709 | 543 | r = sd_event_add_io(context->event, &source, fd, EPOLLIN, accept_cb, context); |
f647962d MS |
544 | if (r < 0) |
545 | return log_error_errno(r, "Failed to add event source: %m"); | |
912b54ad | 546 | |
8569a776 | 547 | r = set_put(context->listen, source); |
96c374d0 | 548 | if (r < 0) { |
da927ba9 | 549 | log_error_errno(r, "Failed to add source to set: %m"); |
8569a776 | 550 | sd_event_source_unref(source); |
40976028 DS |
551 | return r; |
552 | } | |
553 | ||
554 | /* Set the watcher to oneshot in case other processes are also | |
555 | * watching to accept(). */ | |
8569a776 | 556 | r = sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); |
f647962d MS |
557 | if (r < 0) |
558 | return log_error_errno(r, "Failed to enable oneshot mode: %m"); | |
912b54ad | 559 | |
8569a776 | 560 | return 0; |
912b54ad DS |
561 | } |
562 | ||
601185b4 ZJS |
563 | static void help(void) { |
564 | printf("%1$s [HOST:PORT]\n" | |
565 | "%1$s [SOCKET]\n\n" | |
8569a776 | 566 | "Bidirectionally proxy local sockets to another (possibly remote) socket.\n\n" |
23d0fff7 | 567 | " -c --connections-max= Set the maximum number of connections to be accepted\n" |
8cf030b3 LP |
568 | " -h --help Show this help\n" |
569 | " --version Show package version\n", | |
912b54ad | 570 | program_invocation_short_name); |
912b54ad DS |
571 | } |
572 | ||
8569a776 | 573 | static int parse_argv(int argc, char *argv[]) { |
912b54ad DS |
574 | |
575 | enum { | |
8cf030b3 LP |
576 | ARG_VERSION = 0x100, |
577 | ARG_IGNORE_ENV | |
912b54ad DS |
578 | }; |
579 | ||
580 | static const struct option options[] = { | |
dc3b8afb DK |
581 | { "connections-max", required_argument, NULL, 'c' }, |
582 | { "help", no_argument, NULL, 'h' }, | |
583 | { "version", no_argument, NULL, ARG_VERSION }, | |
eb9da376 | 584 | {} |
912b54ad DS |
585 | }; |
586 | ||
dc3b8afb | 587 | int c, r; |
912b54ad DS |
588 | |
589 | assert(argc >= 0); | |
590 | assert(argv); | |
591 | ||
dc3b8afb | 592 | while ((c = getopt_long(argc, argv, "c:h", options, NULL)) >= 0) |
912b54ad DS |
593 | |
594 | switch (c) { | |
595 | ||
596 | case 'h': | |
601185b4 ZJS |
597 | help(); |
598 | return 0; | |
912b54ad | 599 | |
dc3b8afb DK |
600 | case 'c': |
601 | r = safe_atou(optarg, &arg_connections_max); | |
602 | if (r < 0) { | |
603 | log_error("Failed to parse --connections-max= argument: %s", optarg); | |
604 | return r; | |
605 | } | |
606 | ||
607 | if (arg_connections_max < 1) { | |
608 | log_error("Connection limit is too low."); | |
609 | return -EINVAL; | |
610 | } | |
611 | ||
612 | break; | |
613 | ||
912b54ad | 614 | case ARG_VERSION: |
3f6fd1ba | 615 | return version(); |
912b54ad | 616 | |
eb9da376 | 617 | case '?': |
912b54ad | 618 | return -EINVAL; |
eb9da376 LP |
619 | |
620 | default: | |
621 | assert_not_reached("Unhandled option"); | |
912b54ad | 622 | } |
912b54ad | 623 | |
8569a776 LP |
624 | if (optind >= argc) { |
625 | log_error("Not enough parameters."); | |
912b54ad DS |
626 | return -EINVAL; |
627 | } | |
628 | ||
8569a776 LP |
629 | if (argc != optind+1) { |
630 | log_error("Too many parameters."); | |
912b54ad DS |
631 | return -EINVAL; |
632 | } | |
633 | ||
8569a776 | 634 | arg_remote_host = argv[optind]; |
912b54ad DS |
635 | return 1; |
636 | } | |
637 | ||
638 | int main(int argc, char *argv[]) { | |
8569a776 LP |
639 | Context context = {}; |
640 | int r, n, fd; | |
912b54ad DS |
641 | |
642 | log_parse_environment(); | |
643 | log_open(); | |
644 | ||
8569a776 | 645 | r = parse_argv(argc, argv); |
912b54ad DS |
646 | if (r <= 0) |
647 | goto finish; | |
648 | ||
fb69d709 | 649 | r = sd_event_default(&context.event); |
8569a776 | 650 | if (r < 0) { |
da927ba9 | 651 | log_error_errno(r, "Failed to allocate event loop: %m"); |
8569a776 LP |
652 | goto finish; |
653 | } | |
912b54ad | 654 | |
fb69d709 LP |
655 | r = sd_resolve_default(&context.resolve); |
656 | if (r < 0) { | |
da927ba9 | 657 | log_error_errno(r, "Failed to allocate resolver: %m"); |
fb69d709 LP |
658 | goto finish; |
659 | } | |
660 | ||
661 | r = sd_resolve_attach_event(context.resolve, context.event, 0); | |
662 | if (r < 0) { | |
da927ba9 | 663 | log_error_errno(r, "Failed to attach resolver: %m"); |
fb69d709 LP |
664 | goto finish; |
665 | } | |
666 | ||
667 | sd_event_set_watchdog(context.event, true); | |
cde93897 | 668 | |
8cf030b3 LP |
669 | n = sd_listen_fds(1); |
670 | if (n < 0) { | |
671 | log_error("Failed to receive sockets from parent."); | |
672 | r = n; | |
673 | goto finish; | |
674 | } else if (n == 0) { | |
675 | log_error("Didn't get any sockets passed in."); | |
676 | r = -EINVAL; | |
677 | goto finish; | |
678 | } | |
679 | ||
680 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
fb69d709 | 681 | r = add_listen_socket(&context, fd); |
8569a776 | 682 | if (r < 0) |
96c374d0 | 683 | goto finish; |
912b54ad DS |
684 | } |
685 | ||
fb69d709 | 686 | r = sd_event_loop(context.event); |
912b54ad | 687 | if (r < 0) { |
da927ba9 | 688 | log_error_errno(r, "Failed to run event loop: %m"); |
912b54ad DS |
689 | goto finish; |
690 | } | |
691 | ||
912b54ad | 692 | finish: |
8569a776 LP |
693 | context_free(&context); |
694 | ||
912b54ad DS |
695 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
696 | } |