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