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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> | |
29 | #include <sys/fcntl.h> | |
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" | |
96c374d0 | 36 | #include "log.h" |
912b54ad DS |
37 | #include "socket-util.h" |
38 | #include "util.h" | |
96c374d0 | 39 | #include "event-util.h" |
eb9da376 | 40 | #include "build.h" |
8569a776 LP |
41 | #include "set.h" |
42 | #include "path-util.h" | |
43 | ||
44 | #define BUFFER_SIZE (256 * 1024) | |
45 | #define CONNECTIONS_MAX 256 | |
912b54ad | 46 | |
912b54ad | 47 | #define _cleanup_freeaddrinfo_ _cleanup_(freeaddrinfop) |
8569a776 | 48 | DEFINE_TRIVIAL_CLEANUP_FUNC(struct addrinfo *, freeaddrinfo); |
912b54ad | 49 | |
8569a776 LP |
50 | typedef struct Context { |
51 | Set *listen; | |
52 | Set *connections; | |
53 | } Context; | |
912b54ad | 54 | |
8569a776 | 55 | typedef struct Connection { |
e633ea1c LP |
56 | Context *context; |
57 | ||
8569a776 LP |
58 | int server_fd, client_fd; |
59 | int server_to_client_buffer[2]; /* a pipe */ | |
60 | int client_to_server_buffer[2]; /* a pipe */ | |
912b54ad | 61 | |
8569a776 LP |
62 | size_t server_to_client_buffer_full, client_to_server_buffer_full; |
63 | size_t server_to_client_buffer_size, client_to_server_buffer_size; | |
64 | ||
65 | sd_event_source *server_event_source, *client_event_source; | |
66 | } Connection; | |
912b54ad | 67 | |
8569a776 | 68 | static const char *arg_remote_host = NULL; |
912b54ad | 69 | |
8569a776 LP |
70 | static void connection_free(Connection *c) { |
71 | assert(c); | |
32d3c809 | 72 | |
e633ea1c LP |
73 | if (c->context) |
74 | set_remove(c->context->connections, c); | |
75 | ||
8569a776 LP |
76 | sd_event_source_unref(c->server_event_source); |
77 | sd_event_source_unref(c->client_event_source); | |
32d3c809 | 78 | |
8569a776 LP |
79 | if (c->server_fd >= 0) |
80 | close_nointr_nofail(c->server_fd); | |
81 | if (c->client_fd >= 0) | |
82 | close_nointr_nofail(c->client_fd); | |
32d3c809 | 83 | |
8569a776 LP |
84 | close_pipe(c->server_to_client_buffer); |
85 | close_pipe(c->client_to_server_buffer); | |
32d3c809 | 86 | |
8569a776 LP |
87 | free(c); |
88 | } | |
32d3c809 | 89 | |
8569a776 LP |
90 | static void context_free(Context *context) { |
91 | sd_event_source *es; | |
92 | Connection *c; | |
93 | ||
94 | assert(context); | |
95 | ||
96 | while ((es = set_steal_first(context->listen))) | |
97 | sd_event_source_unref(es); | |
98 | ||
e633ea1c | 99 | while ((c = set_first(context->connections))) |
8569a776 LP |
100 | connection_free(c); |
101 | ||
102 | set_free(context->listen); | |
103 | set_free(context->connections); | |
32d3c809 DS |
104 | } |
105 | ||
1ec6af16 | 106 | static int get_remote_sockaddr(union sockaddr_union *sa, socklen_t *salen) { |
32d3c809 DS |
107 | int r; |
108 | ||
8569a776 LP |
109 | assert(sa); |
110 | assert(salen); | |
32d3c809 | 111 | |
8569a776 LP |
112 | if (path_is_absolute(arg_remote_host)) { |
113 | sa->un.sun_family = AF_UNIX; | |
114 | strncpy(sa->un.sun_path, arg_remote_host, sizeof(sa->un.sun_path)-1); | |
115 | sa->un.sun_path[sizeof(sa->un.sun_path)-1] = 0; | |
32d3c809 | 116 | |
1ec6af16 | 117 | *salen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa->un.sun_path); |
32d3c809 | 118 | |
8569a776 LP |
119 | } else if (arg_remote_host[0] == '@') { |
120 | sa->un.sun_family = AF_UNIX; | |
121 | sa->un.sun_path[0] = 0; | |
122 | strncpy(sa->un.sun_path+1, arg_remote_host+1, sizeof(sa->un.sun_path)-2); | |
123 | sa->un.sun_path[sizeof(sa->un.sun_path)-1] = 0; | |
124 | ||
1ec6af16 | 125 | *salen = offsetof(union sockaddr_union, un.sun_path) + 1 + strlen(sa->un.sun_path + 1); |
8569a776 LP |
126 | |
127 | } else { | |
128 | _cleanup_freeaddrinfo_ struct addrinfo *result = NULL; | |
129 | const char *node, *service; | |
130 | ||
131 | struct addrinfo hints = { | |
132 | .ai_family = AF_UNSPEC, | |
133 | .ai_socktype = SOCK_STREAM, | |
134 | .ai_flags = AI_ADDRCONFIG | |
135 | }; | |
136 | ||
137 | service = strrchr(arg_remote_host, ':'); | |
138 | if (service) { | |
139 | node = strndupa(arg_remote_host, service - arg_remote_host); | |
140 | service ++; | |
141 | } else { | |
142 | node = arg_remote_host; | |
143 | service = "80"; | |
5f7e83e8 | 144 | } |
32d3c809 | 145 | |
8569a776 LP |
146 | log_debug("Looking up address info for %s:%s", node, service); |
147 | r = getaddrinfo(node, service, &hints, &result); | |
148 | if (r != 0) { | |
149 | log_error("Failed to resolve host %s:%s: %s", node, service, gai_strerror(r)); | |
150 | return -EHOSTUNREACH; | |
151 | } | |
32d3c809 | 152 | |
8569a776 | 153 | assert(result); |
1ec6af16 | 154 | if (result->ai_addrlen > sizeof(union sockaddr_union)) { |
8569a776 LP |
155 | log_error("Address too long."); |
156 | return -E2BIG; | |
912b54ad DS |
157 | } |
158 | ||
8569a776 LP |
159 | memcpy(sa, result->ai_addr, result->ai_addrlen); |
160 | *salen = result->ai_addrlen; | |
912b54ad DS |
161 | } |
162 | ||
8569a776 LP |
163 | return 0; |
164 | } | |
912b54ad | 165 | |
8569a776 LP |
166 | static int connection_create_pipes(Connection *c, int buffer[2], size_t *sz) { |
167 | int r; | |
912b54ad | 168 | |
8569a776 LP |
169 | assert(c); |
170 | assert(buffer); | |
171 | assert(sz); | |
912b54ad | 172 | |
8569a776 LP |
173 | if (buffer[0] >= 0) |
174 | return 0; | |
912b54ad | 175 | |
8569a776 | 176 | r = pipe2(buffer, O_CLOEXEC|O_NONBLOCK); |
912b54ad | 177 | if (r < 0) { |
8569a776 LP |
178 | log_error("Failed to allocate pipe buffer: %m"); |
179 | return -errno; | |
912b54ad DS |
180 | } |
181 | ||
8569a776 LP |
182 | fcntl(buffer[0], F_SETPIPE_SZ, BUFFER_SIZE); |
183 | ||
184 | r = fcntl(buffer[0], F_GETPIPE_SZ); | |
912b54ad | 185 | if (r < 0) { |
8569a776 LP |
186 | log_error("Failed to get pipe buffer size: %m"); |
187 | return -errno; | |
912b54ad DS |
188 | } |
189 | ||
8569a776 LP |
190 | assert(r > 0); |
191 | *sz = r; | |
192 | ||
912b54ad DS |
193 | return 0; |
194 | } | |
195 | ||
8569a776 LP |
196 | static int connection_shovel( |
197 | Connection *c, | |
198 | int *from, int buffer[2], int *to, | |
199 | size_t *full, size_t *sz, | |
200 | sd_event_source **from_source, sd_event_source **to_source) { | |
201 | ||
202 | bool shoveled; | |
203 | ||
204 | assert(c); | |
205 | assert(from); | |
206 | assert(buffer); | |
207 | assert(buffer[0] >= 0); | |
208 | assert(buffer[1] >= 0); | |
209 | assert(to); | |
210 | assert(full); | |
211 | assert(sz); | |
212 | assert(from_source); | |
213 | assert(to_source); | |
214 | ||
215 | do { | |
216 | ssize_t z; | |
217 | ||
218 | shoveled = false; | |
219 | ||
220 | if (*full < *sz && *from >= 0 && *to >= 0) { | |
221 | z = splice(*from, NULL, buffer[1], NULL, *sz - *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
222 | if (z > 0) { | |
223 | *full += z; | |
224 | shoveled = true; | |
225 | } else if (z == 0 || errno == EPIPE || errno == ECONNRESET) { | |
226 | *from_source = sd_event_source_unref(*from_source); | |
227 | close_nointr_nofail(*from); | |
228 | *from = -1; | |
229 | } else if (errno != EAGAIN && errno != EINTR) { | |
230 | log_error("Failed to splice: %m"); | |
231 | return -errno; | |
912b54ad | 232 | } |
912b54ad DS |
233 | } |
234 | ||
8569a776 LP |
235 | if (*full > 0 && *to >= 0) { |
236 | z = splice(buffer[0], NULL, *to, NULL, *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
237 | if (z > 0) { | |
238 | *full -= z; | |
239 | shoveled = true; | |
240 | } else if (z == 0 || errno == EPIPE || errno == ECONNRESET) { | |
241 | *to_source = sd_event_source_unref(*to_source); | |
242 | close_nointr_nofail(*to); | |
243 | *to = -1; | |
244 | } else if (errno != EAGAIN && errno != EINTR) { | |
245 | log_error("Failed to splice: %m"); | |
246 | return -errno; | |
247 | } | |
248 | } | |
249 | } while (shoveled); | |
912b54ad | 250 | |
8569a776 | 251 | return 0; |
912b54ad DS |
252 | } |
253 | ||
8569a776 LP |
254 | static int connection_enable_event_sources(Connection *c, sd_event *event); |
255 | ||
256 | static int traffic_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
257 | Connection *c = userdata; | |
912b54ad DS |
258 | int r; |
259 | ||
8569a776 LP |
260 | assert(s); |
261 | assert(fd >= 0); | |
262 | assert(c); | |
912b54ad | 263 | |
8569a776 LP |
264 | r = connection_shovel(c, |
265 | &c->server_fd, c->server_to_client_buffer, &c->client_fd, | |
266 | &c->server_to_client_buffer_full, &c->server_to_client_buffer_size, | |
267 | &c->server_event_source, &c->client_event_source); | |
268 | if (r < 0) | |
269 | goto quit; | |
912b54ad | 270 | |
8569a776 LP |
271 | r = connection_shovel(c, |
272 | &c->client_fd, c->client_to_server_buffer, &c->server_fd, | |
273 | &c->client_to_server_buffer_full, &c->client_to_server_buffer_size, | |
274 | &c->client_event_source, &c->server_event_source); | |
275 | if (r < 0) | |
276 | goto quit; | |
912b54ad | 277 | |
8569a776 LP |
278 | /* EOF on both sides? */ |
279 | if (c->server_fd == -1 && c->client_fd == -1) | |
280 | goto quit; | |
912b54ad | 281 | |
8569a776 LP |
282 | /* Server closed, and all data written to client? */ |
283 | if (c->server_fd == -1 && c->server_to_client_buffer_full <= 0) | |
284 | goto quit; | |
912b54ad | 285 | |
8569a776 LP |
286 | /* Client closed, and all data written to server? */ |
287 | if (c->client_fd == -1 && c->client_to_server_buffer_full <= 0) | |
288 | goto quit; | |
912b54ad | 289 | |
adcc4ca3 | 290 | r = connection_enable_event_sources(c, sd_event_source_get_event(s)); |
8569a776 LP |
291 | if (r < 0) |
292 | goto quit; | |
912b54ad | 293 | |
8569a776 | 294 | return 1; |
912b54ad | 295 | |
8569a776 LP |
296 | quit: |
297 | connection_free(c); | |
298 | return 0; /* ignore errors, continue serving */ | |
912b54ad DS |
299 | } |
300 | ||
8569a776 LP |
301 | static int connection_enable_event_sources(Connection *c, sd_event *event) { |
302 | uint32_t a = 0, b = 0; | |
303 | int r; | |
912b54ad | 304 | |
8569a776 LP |
305 | assert(c); |
306 | assert(event); | |
912b54ad | 307 | |
8569a776 LP |
308 | if (c->server_to_client_buffer_full > 0) |
309 | b |= EPOLLOUT; | |
310 | if (c->server_to_client_buffer_full < c->server_to_client_buffer_size) | |
311 | a |= EPOLLIN; | |
912b54ad | 312 | |
8569a776 LP |
313 | if (c->client_to_server_buffer_full > 0) |
314 | a |= EPOLLOUT; | |
315 | if (c->client_to_server_buffer_full < c->client_to_server_buffer_size) | |
316 | b |= EPOLLIN; | |
912b54ad | 317 | |
8569a776 LP |
318 | if (c->server_event_source) |
319 | r = sd_event_source_set_io_events(c->server_event_source, a); | |
320 | else if (c->server_fd >= 0) | |
321 | r = sd_event_add_io(event, c->server_fd, a, traffic_cb, c, &c->server_event_source); | |
322 | else | |
323 | r = 0; | |
324 | ||
325 | if (r < 0) { | |
326 | log_error("Failed to set up server event source: %s", strerror(-r)); | |
327 | return r; | |
912b54ad | 328 | } |
912b54ad | 329 | |
8569a776 LP |
330 | if (c->client_event_source) |
331 | r = sd_event_source_set_io_events(c->client_event_source, b); | |
332 | else if (c->client_fd >= 0) | |
333 | r = sd_event_add_io(event, c->client_fd, b, traffic_cb, c, &c->client_event_source); | |
334 | else | |
335 | r = 0; | |
912b54ad | 336 | |
8569a776 | 337 | if (r < 0) { |
b7484e2a | 338 | log_error("Failed to set up client event source: %s", strerror(-r)); |
8569a776 | 339 | return r; |
912b54ad DS |
340 | } |
341 | ||
8569a776 | 342 | return 0; |
912b54ad DS |
343 | } |
344 | ||
8569a776 LP |
345 | static int connect_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
346 | Connection *c = userdata; | |
347 | socklen_t solen; | |
348 | int error, r; | |
349 | ||
350 | assert(s); | |
351 | assert(fd >= 0); | |
352 | assert(c); | |
353 | ||
354 | solen = sizeof(error); | |
355 | r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &solen); | |
356 | if (r < 0) { | |
357 | log_error("Failed to issue SO_ERROR: %m"); | |
40976028 DS |
358 | goto fail; |
359 | } | |
912b54ad | 360 | |
8569a776 LP |
361 | if (error != 0) { |
362 | log_error("Failed to connect to remote host: %s", strerror(error)); | |
912b54ad DS |
363 | goto fail; |
364 | } | |
365 | ||
8569a776 LP |
366 | c->client_event_source = sd_event_source_unref(c->client_event_source); |
367 | ||
368 | r = connection_create_pipes(c, c->server_to_client_buffer, &c->server_to_client_buffer_size); | |
369 | if (r < 0) | |
912b54ad | 370 | goto fail; |
912b54ad | 371 | |
8569a776 LP |
372 | r = connection_create_pipes(c, c->client_to_server_buffer, &c->client_to_server_buffer_size); |
373 | if (r < 0) | |
912b54ad | 374 | goto fail; |
912b54ad | 375 | |
adcc4ca3 | 376 | r = connection_enable_event_sources(c, sd_event_source_get_event(s)); |
8569a776 LP |
377 | if (r < 0) |
378 | goto fail; | |
912b54ad | 379 | |
8569a776 | 380 | return 0; |
912b54ad | 381 | |
8569a776 LP |
382 | fail: |
383 | connection_free(c); | |
384 | return 0; /* ignore errors, continue serving */ | |
385 | } | |
386 | ||
387 | static int add_connection_socket(Context *context, sd_event *event, int fd) { | |
1ec6af16 | 388 | union sockaddr_union sa = {}; |
8569a776 LP |
389 | socklen_t salen; |
390 | Connection *c; | |
391 | int r; | |
392 | ||
393 | assert(context); | |
394 | assert(event); | |
395 | assert(fd >= 0); | |
396 | ||
397 | if (set_size(context->connections) > CONNECTIONS_MAX) { | |
398 | log_warning("Hit connection limit, refusing connection."); | |
399 | close_nointr_nofail(fd); | |
400 | return 0; | |
912b54ad DS |
401 | } |
402 | ||
8569a776 LP |
403 | r = set_ensure_allocated(&context->connections, trivial_hash_func, trivial_compare_func); |
404 | if (r < 0) | |
405 | return log_oom(); | |
912b54ad | 406 | |
8569a776 LP |
407 | c = new0(Connection, 1); |
408 | if (!c) | |
409 | return log_oom(); | |
410 | ||
e633ea1c | 411 | c->context = context; |
8569a776 LP |
412 | c->server_fd = fd; |
413 | c->client_fd = -1; | |
414 | c->server_to_client_buffer[0] = c->server_to_client_buffer[1] = -1; | |
415 | c->client_to_server_buffer[0] = c->client_to_server_buffer[1] = -1; | |
416 | ||
e633ea1c LP |
417 | r = set_put(context->connections, c); |
418 | if (r < 0) { | |
419 | free(c); | |
420 | return log_oom(); | |
421 | } | |
422 | ||
8569a776 LP |
423 | r = get_remote_sockaddr(&sa, &salen); |
424 | if (r < 0) | |
425 | goto fail; | |
426 | ||
427 | c->client_fd = socket(sa.sa.sa_family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
428 | if (c->client_fd < 0) { | |
429 | log_error("Failed to get remote socket: %m"); | |
912b54ad DS |
430 | goto fail; |
431 | } | |
432 | ||
8569a776 LP |
433 | r = connect(c->client_fd, &sa.sa, salen); |
434 | if (r < 0) { | |
435 | if (errno == EINPROGRESS) { | |
436 | r = sd_event_add_io(event, c->client_fd, EPOLLOUT, connect_cb, c, &c->client_event_source); | |
437 | if (r < 0) { | |
438 | log_error("Failed to add connection socket: %s", strerror(-r)); | |
439 | goto fail; | |
440 | } | |
b7484e2a LP |
441 | |
442 | r = sd_event_source_set_enabled(c->client_event_source, SD_EVENT_ONESHOT); | |
443 | if (r < 0) { | |
444 | log_error("Failed to enable oneshot event source: %s", strerror(-r)); | |
445 | goto fail; | |
446 | } | |
8569a776 LP |
447 | } else { |
448 | log_error("Failed to connect to remote host: %m"); | |
449 | goto fail; | |
450 | } | |
451 | } else { | |
452 | r = connection_enable_event_sources(c, event); | |
453 | if (r < 0) | |
454 | goto fail; | |
455 | } | |
912b54ad | 456 | |
8569a776 | 457 | return 0; |
912b54ad DS |
458 | |
459 | fail: | |
8569a776 LP |
460 | connection_free(c); |
461 | return 0; /* ignore non-OOM errors, continue serving */ | |
40976028 DS |
462 | } |
463 | ||
464 | static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
8569a776 LP |
465 | Context *context = userdata; |
466 | int nfd = -1, r; | |
40976028 | 467 | |
8569a776 LP |
468 | assert(s); |
469 | assert(fd >= 0); | |
40976028 | 470 | assert(revents & EPOLLIN); |
8569a776 LP |
471 | assert(context); |
472 | ||
473 | nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
474 | if (nfd >= 0) { | |
475 | _cleanup_free_ char *peer = NULL; | |
40976028 | 476 | |
8569a776 LP |
477 | getpeername_pretty(nfd, &peer); |
478 | log_debug("New connection from %s", strna(peer)); | |
40976028 | 479 | |
adcc4ca3 | 480 | r = add_connection_socket(context, sd_event_source_get_event(s), nfd); |
f4bd42aa | 481 | if (r < 0) { |
8569a776 LP |
482 | close_nointr_nofail(fd); |
483 | return r; | |
f4bd42aa | 484 | } |
40976028 | 485 | |
8569a776 LP |
486 | } else if (errno != -EAGAIN) |
487 | log_warning("Failed to accept() socket: %m"); | |
488 | ||
40976028 DS |
489 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); |
490 | if (r < 0) { | |
491 | log_error("Error %d while re-enabling listener with ONESHOT: %s", r, strerror(-r)); | |
492 | return r; | |
493 | } | |
494 | ||
96c374d0 | 495 | return 1; |
912b54ad DS |
496 | } |
497 | ||
8569a776 LP |
498 | static int add_listen_socket(Context *context, sd_event *event, int fd) { |
499 | sd_event_source *source; | |
500 | int r; | |
501 | ||
502 | assert(context); | |
503 | assert(event); | |
504 | assert(fd >= 0); | |
912b54ad | 505 | |
8569a776 | 506 | r = set_ensure_allocated(&context->listen, trivial_hash_func, trivial_compare_func); |
96c374d0 | 507 | if (r < 0) { |
8569a776 LP |
508 | log_oom(); |
509 | return r; | |
510 | } | |
511 | ||
512 | r = sd_is_socket(fd, 0, SOCK_STREAM, 1); | |
513 | if (r < 0) { | |
514 | log_error("Failed to determine socket type: %s", strerror(-r)); | |
96c374d0 LP |
515 | return r; |
516 | } | |
8569a776 LP |
517 | if (r == 0) { |
518 | log_error("Passed in socket is not a stream socket."); | |
519 | return -EINVAL; | |
520 | } | |
912b54ad | 521 | |
8569a776 | 522 | r = fd_nonblock(fd, true); |
96c374d0 | 523 | if (r < 0) { |
8569a776 | 524 | log_error("Failed to mark file descriptor non-blocking: %s", strerror(-r)); |
96c374d0 LP |
525 | return r; |
526 | } | |
912b54ad | 527 | |
8569a776 LP |
528 | r = sd_event_add_io(event, fd, EPOLLIN, accept_cb, context, &source); |
529 | if (r < 0) { | |
530 | log_error("Failed to add event source: %s", strerror(-r)); | |
531 | return r; | |
532 | } | |
912b54ad | 533 | |
8569a776 | 534 | r = set_put(context->listen, source); |
96c374d0 | 535 | if (r < 0) { |
8569a776 LP |
536 | log_error("Failed to add source to set: %s", strerror(-r)); |
537 | sd_event_source_unref(source); | |
40976028 DS |
538 | return r; |
539 | } | |
540 | ||
541 | /* Set the watcher to oneshot in case other processes are also | |
542 | * watching to accept(). */ | |
8569a776 | 543 | r = sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); |
40976028 | 544 | if (r < 0) { |
8569a776 | 545 | log_error("Failed to enable oneshot mode: %s", strerror(-r)); |
96c374d0 LP |
546 | return r; |
547 | } | |
912b54ad | 548 | |
8569a776 | 549 | return 0; |
912b54ad DS |
550 | } |
551 | ||
552 | static int help(void) { | |
553 | ||
8569a776 LP |
554 | printf("%s [HOST:PORT]\n" |
555 | "%s [SOCKET]\n\n" | |
556 | "Bidirectionally proxy local sockets to another (possibly remote) socket.\n\n" | |
8cf030b3 LP |
557 | " -h --help Show this help\n" |
558 | " --version Show package version\n", | |
912b54ad DS |
559 | program_invocation_short_name, |
560 | program_invocation_short_name); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
8569a776 | 565 | static int parse_argv(int argc, char *argv[]) { |
912b54ad DS |
566 | |
567 | enum { | |
8cf030b3 LP |
568 | ARG_VERSION = 0x100, |
569 | ARG_IGNORE_ENV | |
912b54ad DS |
570 | }; |
571 | ||
572 | static const struct option options[] = { | |
8cf030b3 LP |
573 | { "help", no_argument, NULL, 'h' }, |
574 | { "version", no_argument, NULL, ARG_VERSION }, | |
eb9da376 | 575 | {} |
912b54ad DS |
576 | }; |
577 | ||
8cf030b3 | 578 | int c; |
912b54ad DS |
579 | |
580 | assert(argc >= 0); | |
581 | assert(argv); | |
582 | ||
8cf030b3 | 583 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { |
912b54ad DS |
584 | |
585 | switch (c) { | |
586 | ||
587 | case 'h': | |
eb9da376 | 588 | return help(); |
912b54ad DS |
589 | |
590 | case ARG_VERSION: | |
eb9da376 LP |
591 | puts(PACKAGE_STRING); |
592 | puts(SYSTEMD_FEATURES); | |
912b54ad DS |
593 | return 0; |
594 | ||
eb9da376 | 595 | case '?': |
912b54ad | 596 | return -EINVAL; |
eb9da376 LP |
597 | |
598 | default: | |
599 | assert_not_reached("Unhandled option"); | |
912b54ad DS |
600 | } |
601 | } | |
602 | ||
8569a776 LP |
603 | if (optind >= argc) { |
604 | log_error("Not enough parameters."); | |
912b54ad DS |
605 | return -EINVAL; |
606 | } | |
607 | ||
8569a776 LP |
608 | if (argc != optind+1) { |
609 | log_error("Too many parameters."); | |
912b54ad DS |
610 | return -EINVAL; |
611 | } | |
612 | ||
8569a776 | 613 | arg_remote_host = argv[optind]; |
912b54ad DS |
614 | return 1; |
615 | } | |
616 | ||
617 | int main(int argc, char *argv[]) { | |
8569a776 LP |
618 | _cleanup_event_unref_ sd_event *event = NULL; |
619 | Context context = {}; | |
620 | int r, n, fd; | |
912b54ad DS |
621 | |
622 | log_parse_environment(); | |
623 | log_open(); | |
624 | ||
8569a776 | 625 | r = parse_argv(argc, argv); |
912b54ad DS |
626 | if (r <= 0) |
627 | goto finish; | |
628 | ||
afc6adb5 | 629 | r = sd_event_default(&event); |
8569a776 LP |
630 | if (r < 0) { |
631 | log_error("Failed to allocate event loop: %s", strerror(-r)); | |
632 | goto finish; | |
633 | } | |
912b54ad | 634 | |
8cf030b3 LP |
635 | n = sd_listen_fds(1); |
636 | if (n < 0) { | |
637 | log_error("Failed to receive sockets from parent."); | |
638 | r = n; | |
639 | goto finish; | |
640 | } else if (n == 0) { | |
641 | log_error("Didn't get any sockets passed in."); | |
642 | r = -EINVAL; | |
643 | goto finish; | |
644 | } | |
645 | ||
646 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
647 | r = add_listen_socket(&context, event, fd); | |
8569a776 | 648 | if (r < 0) |
96c374d0 | 649 | goto finish; |
912b54ad DS |
650 | } |
651 | ||
8569a776 | 652 | r = sd_event_loop(event); |
912b54ad | 653 | if (r < 0) { |
8569a776 | 654 | log_error("Failed to run event loop: %s", strerror(-r)); |
912b54ad DS |
655 | goto finish; |
656 | } | |
657 | ||
912b54ad | 658 | finish: |
8569a776 LP |
659 | context_free(&context); |
660 | ||
912b54ad DS |
661 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
662 | } |