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912b54ad DS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 David Strauss | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <arpa/inet.h> | |
23 | #include <errno.h> | |
24 | #include <getopt.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <netdb.h> | |
fdb8bd0f | 29 | #include <fcntl.h> |
912b54ad DS |
30 | #include <sys/socket.h> |
31 | #include <sys/un.h> | |
32 | #include <unistd.h> | |
33 | ||
912b54ad DS |
34 | #include "sd-daemon.h" |
35 | #include "sd-event.h" | |
fb69d709 | 36 | #include "sd-resolve.h" |
96c374d0 | 37 | #include "log.h" |
912b54ad DS |
38 | #include "socket-util.h" |
39 | #include "util.h" | |
96c374d0 | 40 | #include "event-util.h" |
eb9da376 | 41 | #include "build.h" |
8569a776 LP |
42 | #include "set.h" |
43 | #include "path-util.h" | |
44 | ||
45 | #define BUFFER_SIZE (256 * 1024) | |
46 | #define 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); |
912b54ad | 123 | if (r < 0) { |
8569a776 LP |
124 | log_error("Failed to allocate pipe buffer: %m"); |
125 | return -errno; | |
912b54ad DS |
126 | } |
127 | ||
25dbe4f5 | 128 | (void) fcntl(buffer[0], F_SETPIPE_SZ, BUFFER_SIZE); |
8569a776 LP |
129 | |
130 | r = fcntl(buffer[0], F_GETPIPE_SZ); | |
912b54ad | 131 | if (r < 0) { |
8569a776 LP |
132 | log_error("Failed to get pipe buffer size: %m"); |
133 | return -errno; | |
912b54ad DS |
134 | } |
135 | ||
8569a776 LP |
136 | assert(r > 0); |
137 | *sz = r; | |
138 | ||
912b54ad DS |
139 | return 0; |
140 | } | |
141 | ||
8569a776 LP |
142 | static int connection_shovel( |
143 | Connection *c, | |
144 | int *from, int buffer[2], int *to, | |
145 | size_t *full, size_t *sz, | |
146 | sd_event_source **from_source, sd_event_source **to_source) { | |
147 | ||
148 | bool shoveled; | |
149 | ||
150 | assert(c); | |
151 | assert(from); | |
152 | assert(buffer); | |
153 | assert(buffer[0] >= 0); | |
154 | assert(buffer[1] >= 0); | |
155 | assert(to); | |
156 | assert(full); | |
157 | assert(sz); | |
158 | assert(from_source); | |
159 | assert(to_source); | |
160 | ||
161 | do { | |
162 | ssize_t z; | |
163 | ||
164 | shoveled = false; | |
165 | ||
166 | if (*full < *sz && *from >= 0 && *to >= 0) { | |
167 | z = splice(*from, NULL, buffer[1], NULL, *sz - *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
168 | if (z > 0) { | |
169 | *full += z; | |
170 | shoveled = true; | |
171 | } else if (z == 0 || errno == EPIPE || errno == ECONNRESET) { | |
172 | *from_source = sd_event_source_unref(*from_source); | |
03e334a1 | 173 | *from = safe_close(*from); |
8569a776 LP |
174 | } else if (errno != EAGAIN && errno != EINTR) { |
175 | log_error("Failed to splice: %m"); | |
176 | return -errno; | |
912b54ad | 177 | } |
912b54ad DS |
178 | } |
179 | ||
8569a776 LP |
180 | if (*full > 0 && *to >= 0) { |
181 | z = splice(buffer[0], NULL, *to, NULL, *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
182 | if (z > 0) { | |
183 | *full -= z; | |
184 | shoveled = true; | |
185 | } else if (z == 0 || errno == EPIPE || errno == ECONNRESET) { | |
186 | *to_source = sd_event_source_unref(*to_source); | |
03e334a1 | 187 | *to = safe_close(*to); |
8569a776 LP |
188 | } else if (errno != EAGAIN && errno != EINTR) { |
189 | log_error("Failed to splice: %m"); | |
190 | return -errno; | |
191 | } | |
192 | } | |
193 | } while (shoveled); | |
912b54ad | 194 | |
8569a776 | 195 | return 0; |
912b54ad DS |
196 | } |
197 | ||
fb69d709 | 198 | static int connection_enable_event_sources(Connection *c); |
8569a776 LP |
199 | |
200 | static int traffic_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
201 | Connection *c = userdata; | |
912b54ad DS |
202 | int r; |
203 | ||
8569a776 LP |
204 | assert(s); |
205 | assert(fd >= 0); | |
206 | assert(c); | |
912b54ad | 207 | |
8569a776 LP |
208 | r = connection_shovel(c, |
209 | &c->server_fd, c->server_to_client_buffer, &c->client_fd, | |
210 | &c->server_to_client_buffer_full, &c->server_to_client_buffer_size, | |
211 | &c->server_event_source, &c->client_event_source); | |
212 | if (r < 0) | |
213 | goto quit; | |
912b54ad | 214 | |
8569a776 LP |
215 | r = connection_shovel(c, |
216 | &c->client_fd, c->client_to_server_buffer, &c->server_fd, | |
217 | &c->client_to_server_buffer_full, &c->client_to_server_buffer_size, | |
218 | &c->client_event_source, &c->server_event_source); | |
219 | if (r < 0) | |
220 | goto quit; | |
912b54ad | 221 | |
8569a776 LP |
222 | /* EOF on both sides? */ |
223 | if (c->server_fd == -1 && c->client_fd == -1) | |
224 | goto quit; | |
912b54ad | 225 | |
8569a776 LP |
226 | /* Server closed, and all data written to client? */ |
227 | if (c->server_fd == -1 && c->server_to_client_buffer_full <= 0) | |
228 | goto quit; | |
912b54ad | 229 | |
8569a776 LP |
230 | /* Client closed, and all data written to server? */ |
231 | if (c->client_fd == -1 && c->client_to_server_buffer_full <= 0) | |
232 | goto quit; | |
912b54ad | 233 | |
fb69d709 | 234 | r = connection_enable_event_sources(c); |
8569a776 LP |
235 | if (r < 0) |
236 | goto quit; | |
912b54ad | 237 | |
8569a776 | 238 | return 1; |
912b54ad | 239 | |
8569a776 LP |
240 | quit: |
241 | connection_free(c); | |
242 | return 0; /* ignore errors, continue serving */ | |
912b54ad DS |
243 | } |
244 | ||
fb69d709 | 245 | static int connection_enable_event_sources(Connection *c) { |
8569a776 LP |
246 | uint32_t a = 0, b = 0; |
247 | int r; | |
912b54ad | 248 | |
8569a776 | 249 | assert(c); |
912b54ad | 250 | |
8569a776 LP |
251 | if (c->server_to_client_buffer_full > 0) |
252 | b |= EPOLLOUT; | |
253 | if (c->server_to_client_buffer_full < c->server_to_client_buffer_size) | |
254 | a |= EPOLLIN; | |
912b54ad | 255 | |
8569a776 LP |
256 | if (c->client_to_server_buffer_full > 0) |
257 | a |= EPOLLOUT; | |
258 | if (c->client_to_server_buffer_full < c->client_to_server_buffer_size) | |
259 | b |= EPOLLIN; | |
912b54ad | 260 | |
8569a776 LP |
261 | if (c->server_event_source) |
262 | r = sd_event_source_set_io_events(c->server_event_source, a); | |
263 | else if (c->server_fd >= 0) | |
fb69d709 | 264 | r = sd_event_add_io(c->context->event, &c->server_event_source, c->server_fd, a, traffic_cb, c); |
8569a776 LP |
265 | else |
266 | r = 0; | |
267 | ||
268 | if (r < 0) { | |
0a1beeb6 | 269 | log_error_errno(-r, "Failed to set up server event source: %m"); |
8569a776 | 270 | return r; |
912b54ad | 271 | } |
912b54ad | 272 | |
8569a776 LP |
273 | if (c->client_event_source) |
274 | r = sd_event_source_set_io_events(c->client_event_source, b); | |
275 | else if (c->client_fd >= 0) | |
fb69d709 | 276 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, b, traffic_cb, c); |
8569a776 LP |
277 | else |
278 | r = 0; | |
912b54ad | 279 | |
8569a776 | 280 | if (r < 0) { |
0a1beeb6 | 281 | log_error_errno(-r, "Failed to set up client event source: %m"); |
8569a776 | 282 | return r; |
912b54ad DS |
283 | } |
284 | ||
8569a776 | 285 | return 0; |
912b54ad DS |
286 | } |
287 | ||
fb69d709 LP |
288 | static int connection_complete(Connection *c) { |
289 | int r; | |
290 | ||
291 | assert(c); | |
292 | ||
293 | r = connection_create_pipes(c, c->server_to_client_buffer, &c->server_to_client_buffer_size); | |
294 | if (r < 0) | |
295 | goto fail; | |
296 | ||
297 | r = connection_create_pipes(c, c->client_to_server_buffer, &c->client_to_server_buffer_size); | |
298 | if (r < 0) | |
299 | goto fail; | |
300 | ||
301 | r = connection_enable_event_sources(c); | |
302 | if (r < 0) | |
303 | goto fail; | |
304 | ||
305 | return 0; | |
306 | ||
307 | fail: | |
308 | connection_free(c); | |
309 | return 0; /* ignore errors, continue serving */ | |
310 | } | |
311 | ||
8569a776 LP |
312 | static int connect_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
313 | Connection *c = userdata; | |
314 | socklen_t solen; | |
315 | int error, r; | |
316 | ||
317 | assert(s); | |
318 | assert(fd >= 0); | |
319 | assert(c); | |
320 | ||
321 | solen = sizeof(error); | |
322 | r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &solen); | |
323 | if (r < 0) { | |
324 | log_error("Failed to issue SO_ERROR: %m"); | |
40976028 DS |
325 | goto fail; |
326 | } | |
912b54ad | 327 | |
8569a776 LP |
328 | if (error != 0) { |
329 | log_error("Failed to connect to remote host: %s", strerror(error)); | |
912b54ad DS |
330 | goto fail; |
331 | } | |
332 | ||
8569a776 LP |
333 | c->client_event_source = sd_event_source_unref(c->client_event_source); |
334 | ||
fb69d709 | 335 | return connection_complete(c); |
912b54ad | 336 | |
fb69d709 LP |
337 | fail: |
338 | connection_free(c); | |
339 | return 0; /* ignore errors, continue serving */ | |
340 | } | |
912b54ad | 341 | |
fb69d709 LP |
342 | static int connection_start(Connection *c, struct sockaddr *sa, socklen_t salen) { |
343 | int r; | |
344 | ||
345 | assert(c); | |
346 | assert(sa); | |
347 | assert(salen); | |
348 | ||
349 | c->client_fd = socket(sa->sa_family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
350 | if (c->client_fd < 0) { | |
351 | log_error("Failed to get remote socket: %m"); | |
8569a776 | 352 | goto fail; |
fb69d709 LP |
353 | } |
354 | ||
355 | r = connect(c->client_fd, sa, salen); | |
356 | if (r < 0) { | |
357 | if (errno == EINPROGRESS) { | |
358 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, EPOLLOUT, connect_cb, c); | |
359 | if (r < 0) { | |
0a1beeb6 | 360 | log_error_errno(-r, "Failed to add connection socket: %m"); |
fb69d709 LP |
361 | goto fail; |
362 | } | |
363 | ||
364 | r = sd_event_source_set_enabled(c->client_event_source, SD_EVENT_ONESHOT); | |
365 | if (r < 0) { | |
0a1beeb6 | 366 | log_error_errno(-r, "Failed to enable oneshot event source: %m"); |
fb69d709 LP |
367 | goto fail; |
368 | } | |
369 | } else { | |
370 | log_error("Failed to connect to remote host: %m"); | |
371 | goto fail; | |
372 | } | |
373 | } else { | |
374 | r = connection_complete(c); | |
375 | if (r < 0) | |
376 | goto fail; | |
377 | } | |
912b54ad | 378 | |
8569a776 | 379 | return 0; |
912b54ad | 380 | |
8569a776 LP |
381 | fail: |
382 | connection_free(c); | |
383 | return 0; /* ignore errors, continue serving */ | |
384 | } | |
385 | ||
fb69d709 LP |
386 | static int resolve_cb(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { |
387 | Connection *c = userdata; | |
388 | ||
389 | assert(q); | |
390 | assert(c); | |
391 | ||
392 | if (ret != 0) { | |
393 | log_error("Failed to resolve host: %s", gai_strerror(ret)); | |
394 | goto fail; | |
395 | } | |
396 | ||
397 | c->resolve_query = sd_resolve_query_unref(c->resolve_query); | |
398 | ||
399 | return connection_start(c, ai->ai_addr, ai->ai_addrlen); | |
400 | ||
401 | fail: | |
402 | connection_free(c); | |
403 | return 0; /* ignore errors, continue serving */ | |
404 | } | |
405 | ||
406 | static int resolve_remote(Connection *c) { | |
407 | ||
408 | static const struct addrinfo hints = { | |
409 | .ai_family = AF_UNSPEC, | |
410 | .ai_socktype = SOCK_STREAM, | |
411 | .ai_flags = AI_ADDRCONFIG | |
412 | }; | |
413 | ||
1ec6af16 | 414 | union sockaddr_union sa = {}; |
fb69d709 | 415 | const char *node, *service; |
8569a776 | 416 | socklen_t salen; |
fb69d709 LP |
417 | int r; |
418 | ||
419 | if (path_is_absolute(arg_remote_host)) { | |
420 | sa.un.sun_family = AF_UNIX; | |
421 | strncpy(sa.un.sun_path, arg_remote_host, sizeof(sa.un.sun_path)-1); | |
422 | sa.un.sun_path[sizeof(sa.un.sun_path)-1] = 0; | |
423 | ||
424 | salen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path); | |
425 | ||
426 | return connection_start(c, &sa.sa, salen); | |
427 | } | |
428 | ||
429 | if (arg_remote_host[0] == '@') { | |
430 | sa.un.sun_family = AF_UNIX; | |
431 | sa.un.sun_path[0] = 0; | |
432 | strncpy(sa.un.sun_path+1, arg_remote_host+1, sizeof(sa.un.sun_path)-2); | |
433 | sa.un.sun_path[sizeof(sa.un.sun_path)-1] = 0; | |
434 | ||
435 | salen = offsetof(union sockaddr_union, un.sun_path) + 1 + strlen(sa.un.sun_path + 1); | |
436 | ||
437 | return connection_start(c, &sa.sa, salen); | |
438 | } | |
439 | ||
440 | service = strrchr(arg_remote_host, ':'); | |
441 | if (service) { | |
442 | node = strndupa(arg_remote_host, service - arg_remote_host); | |
443 | service ++; | |
444 | } else { | |
445 | node = arg_remote_host; | |
446 | service = "80"; | |
447 | } | |
448 | ||
449 | log_debug("Looking up address info for %s:%s", node, service); | |
450 | r = sd_resolve_getaddrinfo(c->context->resolve, &c->resolve_query, node, service, &hints, resolve_cb, c); | |
451 | if (r < 0) { | |
0a1beeb6 | 452 | log_error_errno(-r, "Failed to resolve remote host: %m"); |
fb69d709 LP |
453 | goto fail; |
454 | } | |
455 | ||
456 | return 0; | |
457 | ||
458 | fail: | |
459 | connection_free(c); | |
460 | return 0; /* ignore errors, continue serving */ | |
461 | } | |
462 | ||
463 | static int add_connection_socket(Context *context, int fd) { | |
8569a776 LP |
464 | Connection *c; |
465 | int r; | |
466 | ||
467 | assert(context); | |
8569a776 LP |
468 | assert(fd >= 0); |
469 | ||
470 | if (set_size(context->connections) > CONNECTIONS_MAX) { | |
471 | log_warning("Hit connection limit, refusing connection."); | |
03e334a1 | 472 | safe_close(fd); |
8569a776 | 473 | return 0; |
912b54ad DS |
474 | } |
475 | ||
d5099efc | 476 | r = set_ensure_allocated(&context->connections, NULL); |
fb69d709 LP |
477 | if (r < 0) { |
478 | log_oom(); | |
479 | return 0; | |
480 | } | |
912b54ad | 481 | |
8569a776 | 482 | c = new0(Connection, 1); |
fb69d709 LP |
483 | if (!c) { |
484 | log_oom(); | |
485 | return 0; | |
486 | } | |
8569a776 | 487 | |
e633ea1c | 488 | c->context = context; |
8569a776 LP |
489 | c->server_fd = fd; |
490 | c->client_fd = -1; | |
491 | c->server_to_client_buffer[0] = c->server_to_client_buffer[1] = -1; | |
492 | c->client_to_server_buffer[0] = c->client_to_server_buffer[1] = -1; | |
493 | ||
e633ea1c LP |
494 | r = set_put(context->connections, c); |
495 | if (r < 0) { | |
496 | free(c); | |
fb69d709 LP |
497 | log_oom(); |
498 | return 0; | |
8569a776 | 499 | } |
912b54ad | 500 | |
fb69d709 | 501 | return resolve_remote(c); |
40976028 DS |
502 | } |
503 | ||
504 | static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
7b77ed8c | 505 | _cleanup_free_ char *peer = NULL; |
8569a776 LP |
506 | Context *context = userdata; |
507 | int nfd = -1, r; | |
40976028 | 508 | |
8569a776 LP |
509 | assert(s); |
510 | assert(fd >= 0); | |
40976028 | 511 | assert(revents & EPOLLIN); |
8569a776 LP |
512 | assert(context); |
513 | ||
514 | nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
7b77ed8c LP |
515 | if (nfd < 0) { |
516 | if (errno != -EAGAIN) | |
517 | log_warning("Failed to accept() socket: %m"); | |
518 | } else { | |
8569a776 LP |
519 | getpeername_pretty(nfd, &peer); |
520 | log_debug("New connection from %s", strna(peer)); | |
40976028 | 521 | |
fb69d709 | 522 | r = add_connection_socket(context, nfd); |
f4bd42aa | 523 | if (r < 0) { |
0a1beeb6 | 524 | log_error_errno(-r, "Failed to accept connection, ignoring: %m"); |
03e334a1 | 525 | safe_close(fd); |
f4bd42aa | 526 | } |
7b77ed8c | 527 | } |
8569a776 | 528 | |
40976028 DS |
529 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); |
530 | if (r < 0) { | |
0a1beeb6 | 531 | log_error_errno(-r, "Error while re-enabling listener with ONESHOT: %m"); |
fb69d709 | 532 | sd_event_exit(context->event, r); |
40976028 DS |
533 | return r; |
534 | } | |
535 | ||
96c374d0 | 536 | return 1; |
912b54ad DS |
537 | } |
538 | ||
fb69d709 | 539 | static int add_listen_socket(Context *context, int fd) { |
8569a776 LP |
540 | sd_event_source *source; |
541 | int r; | |
542 | ||
543 | assert(context); | |
8569a776 | 544 | assert(fd >= 0); |
912b54ad | 545 | |
d5099efc | 546 | r = set_ensure_allocated(&context->listen, NULL); |
96c374d0 | 547 | if (r < 0) { |
8569a776 LP |
548 | log_oom(); |
549 | return r; | |
550 | } | |
551 | ||
552 | r = sd_is_socket(fd, 0, SOCK_STREAM, 1); | |
553 | if (r < 0) { | |
0a1beeb6 | 554 | log_error_errno(-r, "Failed to determine socket type: %m"); |
96c374d0 LP |
555 | return r; |
556 | } | |
8569a776 LP |
557 | if (r == 0) { |
558 | log_error("Passed in socket is not a stream socket."); | |
559 | return -EINVAL; | |
560 | } | |
912b54ad | 561 | |
8569a776 | 562 | r = fd_nonblock(fd, true); |
96c374d0 | 563 | if (r < 0) { |
0a1beeb6 | 564 | log_error_errno(-r, "Failed to mark file descriptor non-blocking: %m"); |
96c374d0 LP |
565 | return r; |
566 | } | |
912b54ad | 567 | |
fb69d709 | 568 | r = sd_event_add_io(context->event, &source, fd, EPOLLIN, accept_cb, context); |
8569a776 | 569 | if (r < 0) { |
0a1beeb6 | 570 | log_error_errno(-r, "Failed to add event source: %m"); |
8569a776 LP |
571 | return r; |
572 | } | |
912b54ad | 573 | |
8569a776 | 574 | r = set_put(context->listen, source); |
96c374d0 | 575 | if (r < 0) { |
0a1beeb6 | 576 | log_error_errno(-r, "Failed to add source to set: %m"); |
8569a776 | 577 | sd_event_source_unref(source); |
40976028 DS |
578 | return r; |
579 | } | |
580 | ||
581 | /* Set the watcher to oneshot in case other processes are also | |
582 | * watching to accept(). */ | |
8569a776 | 583 | r = sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); |
40976028 | 584 | if (r < 0) { |
0a1beeb6 | 585 | log_error_errno(-r, "Failed to enable oneshot mode: %m"); |
96c374d0 LP |
586 | return r; |
587 | } | |
912b54ad | 588 | |
8569a776 | 589 | return 0; |
912b54ad DS |
590 | } |
591 | ||
601185b4 ZJS |
592 | static void help(void) { |
593 | printf("%1$s [HOST:PORT]\n" | |
594 | "%1$s [SOCKET]\n\n" | |
8569a776 | 595 | "Bidirectionally proxy local sockets to another (possibly remote) socket.\n\n" |
8cf030b3 LP |
596 | " -h --help Show this help\n" |
597 | " --version Show package version\n", | |
912b54ad | 598 | program_invocation_short_name); |
912b54ad DS |
599 | } |
600 | ||
8569a776 | 601 | static int parse_argv(int argc, char *argv[]) { |
912b54ad DS |
602 | |
603 | enum { | |
8cf030b3 LP |
604 | ARG_VERSION = 0x100, |
605 | ARG_IGNORE_ENV | |
912b54ad DS |
606 | }; |
607 | ||
608 | static const struct option options[] = { | |
8cf030b3 LP |
609 | { "help", no_argument, NULL, 'h' }, |
610 | { "version", no_argument, NULL, ARG_VERSION }, | |
eb9da376 | 611 | {} |
912b54ad DS |
612 | }; |
613 | ||
8cf030b3 | 614 | int c; |
912b54ad DS |
615 | |
616 | assert(argc >= 0); | |
617 | assert(argv); | |
618 | ||
601185b4 | 619 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
912b54ad DS |
620 | |
621 | switch (c) { | |
622 | ||
623 | case 'h': | |
601185b4 ZJS |
624 | help(); |
625 | return 0; | |
912b54ad DS |
626 | |
627 | case ARG_VERSION: | |
eb9da376 LP |
628 | puts(PACKAGE_STRING); |
629 | puts(SYSTEMD_FEATURES); | |
912b54ad DS |
630 | return 0; |
631 | ||
eb9da376 | 632 | case '?': |
912b54ad | 633 | return -EINVAL; |
eb9da376 LP |
634 | |
635 | default: | |
636 | assert_not_reached("Unhandled option"); | |
912b54ad | 637 | } |
912b54ad | 638 | |
8569a776 LP |
639 | if (optind >= argc) { |
640 | log_error("Not enough parameters."); | |
912b54ad DS |
641 | return -EINVAL; |
642 | } | |
643 | ||
8569a776 LP |
644 | if (argc != optind+1) { |
645 | log_error("Too many parameters."); | |
912b54ad DS |
646 | return -EINVAL; |
647 | } | |
648 | ||
8569a776 | 649 | arg_remote_host = argv[optind]; |
912b54ad DS |
650 | return 1; |
651 | } | |
652 | ||
653 | int main(int argc, char *argv[]) { | |
8569a776 LP |
654 | Context context = {}; |
655 | int r, n, fd; | |
912b54ad DS |
656 | |
657 | log_parse_environment(); | |
658 | log_open(); | |
659 | ||
8569a776 | 660 | r = parse_argv(argc, argv); |
912b54ad DS |
661 | if (r <= 0) |
662 | goto finish; | |
663 | ||
fb69d709 | 664 | r = sd_event_default(&context.event); |
8569a776 | 665 | if (r < 0) { |
0a1beeb6 | 666 | log_error_errno(-r, "Failed to allocate event loop: %m"); |
8569a776 LP |
667 | goto finish; |
668 | } | |
912b54ad | 669 | |
fb69d709 LP |
670 | r = sd_resolve_default(&context.resolve); |
671 | if (r < 0) { | |
0a1beeb6 | 672 | log_error_errno(-r, "Failed to allocate resolver: %m"); |
fb69d709 LP |
673 | goto finish; |
674 | } | |
675 | ||
676 | r = sd_resolve_attach_event(context.resolve, context.event, 0); | |
677 | if (r < 0) { | |
0a1beeb6 | 678 | log_error_errno(-r, "Failed to attach resolver: %m"); |
fb69d709 LP |
679 | goto finish; |
680 | } | |
681 | ||
682 | sd_event_set_watchdog(context.event, true); | |
cde93897 | 683 | |
8cf030b3 LP |
684 | n = sd_listen_fds(1); |
685 | if (n < 0) { | |
686 | log_error("Failed to receive sockets from parent."); | |
687 | r = n; | |
688 | goto finish; | |
689 | } else if (n == 0) { | |
690 | log_error("Didn't get any sockets passed in."); | |
691 | r = -EINVAL; | |
692 | goto finish; | |
693 | } | |
694 | ||
695 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
fb69d709 | 696 | r = add_listen_socket(&context, fd); |
8569a776 | 697 | if (r < 0) |
96c374d0 | 698 | goto finish; |
912b54ad DS |
699 | } |
700 | ||
fb69d709 | 701 | r = sd_event_loop(context.event); |
912b54ad | 702 | if (r < 0) { |
0a1beeb6 | 703 | log_error_errno(-r, "Failed to run event loop: %m"); |
912b54ad DS |
704 | goto finish; |
705 | } | |
706 | ||
912b54ad | 707 | finish: |
8569a776 LP |
708 | context_free(&context); |
709 | ||
912b54ad DS |
710 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
711 | } |