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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
912b54ad | 2 | |
912b54ad | 3 | #include <errno.h> |
3f6fd1ba | 4 | #include <fcntl.h> |
912b54ad | 5 | #include <getopt.h> |
3f6fd1ba | 6 | #include <netdb.h> |
912b54ad DS |
7 | #include <stdio.h> |
8 | #include <stdlib.h> | |
9 | #include <string.h> | |
912b54ad DS |
10 | #include <sys/socket.h> |
11 | #include <sys/un.h> | |
12 | #include <unistd.h> | |
13 | ||
912b54ad DS |
14 | #include "sd-daemon.h" |
15 | #include "sd-event.h" | |
fb69d709 | 16 | #include "sd-resolve.h" |
3f6fd1ba | 17 | |
b5efdb8a | 18 | #include "alloc-util.h" |
f60a028a | 19 | #include "errno-util.h" |
3ffd4af2 | 20 | #include "fd-util.h" |
96c374d0 | 21 | #include "log.h" |
a160567e | 22 | #include "main-func.h" |
37ec0fdd | 23 | #include "parse-util.h" |
3f6fd1ba | 24 | #include "path-util.h" |
294bf0c3 | 25 | #include "pretty-print.h" |
f2935c77 | 26 | #include "resolve-private.h" |
3f6fd1ba | 27 | #include "set.h" |
912b54ad | 28 | #include "socket-util.h" |
07630cea | 29 | #include "string-util.h" |
912b54ad | 30 | #include "util.h" |
8569a776 LP |
31 | |
32 | #define BUFFER_SIZE (256 * 1024) | |
912b54ad | 33 | |
f60a028a | 34 | static unsigned arg_connections_max = 256; |
fb69d709 LP |
35 | static const char *arg_remote_host = NULL; |
36 | ||
8569a776 | 37 | typedef struct Context { |
fb69d709 LP |
38 | sd_event *event; |
39 | sd_resolve *resolve; | |
40 | ||
8569a776 LP |
41 | Set *listen; |
42 | Set *connections; | |
43 | } Context; | |
912b54ad | 44 | |
8569a776 | 45 | typedef struct Connection { |
e633ea1c LP |
46 | Context *context; |
47 | ||
8569a776 LP |
48 | int server_fd, client_fd; |
49 | int server_to_client_buffer[2]; /* a pipe */ | |
50 | int client_to_server_buffer[2]; /* a pipe */ | |
912b54ad | 51 | |
8569a776 LP |
52 | size_t server_to_client_buffer_full, client_to_server_buffer_full; |
53 | size_t server_to_client_buffer_size, client_to_server_buffer_size; | |
54 | ||
55 | sd_event_source *server_event_source, *client_event_source; | |
912b54ad | 56 | |
fb69d709 LP |
57 | sd_resolve_query *resolve_query; |
58 | } Connection; | |
912b54ad | 59 | |
8569a776 LP |
60 | static void connection_free(Connection *c) { |
61 | assert(c); | |
32d3c809 | 62 | |
e633ea1c LP |
63 | if (c->context) |
64 | set_remove(c->context->connections, c); | |
65 | ||
8569a776 LP |
66 | sd_event_source_unref(c->server_event_source); |
67 | sd_event_source_unref(c->client_event_source); | |
32d3c809 | 68 | |
03e334a1 LP |
69 | safe_close(c->server_fd); |
70 | safe_close(c->client_fd); | |
32d3c809 | 71 | |
3d94f76c LP |
72 | safe_close_pair(c->server_to_client_buffer); |
73 | safe_close_pair(c->client_to_server_buffer); | |
32d3c809 | 74 | |
fb69d709 LP |
75 | sd_resolve_query_unref(c->resolve_query); |
76 | ||
8569a776 LP |
77 | free(c); |
78 | } | |
32d3c809 | 79 | |
a160567e | 80 | static void context_clear(Context *context) { |
8569a776 LP |
81 | assert(context); |
82 | ||
224b0e7a ZJS |
83 | set_free_with_destructor(context->listen, sd_event_source_unref); |
84 | set_free_with_destructor(context->connections, connection_free); | |
32d3c809 | 85 | |
fb69d709 LP |
86 | sd_event_unref(context->event); |
87 | sd_resolve_unref(context->resolve); | |
8569a776 | 88 | } |
912b54ad | 89 | |
3042bbeb | 90 | static int connection_create_pipes(Connection *c, int buffer[static 2], size_t *sz) { |
8569a776 | 91 | int r; |
912b54ad | 92 | |
8569a776 LP |
93 | assert(c); |
94 | assert(buffer); | |
95 | assert(sz); | |
912b54ad | 96 | |
8569a776 LP |
97 | if (buffer[0] >= 0) |
98 | return 0; | |
912b54ad | 99 | |
8569a776 | 100 | r = pipe2(buffer, O_CLOEXEC|O_NONBLOCK); |
4a62c710 MS |
101 | if (r < 0) |
102 | return log_error_errno(errno, "Failed to allocate pipe buffer: %m"); | |
912b54ad | 103 | |
25dbe4f5 | 104 | (void) fcntl(buffer[0], F_SETPIPE_SZ, BUFFER_SIZE); |
8569a776 LP |
105 | |
106 | r = fcntl(buffer[0], F_GETPIPE_SZ); | |
4a62c710 MS |
107 | if (r < 0) |
108 | return log_error_errno(errno, "Failed to get pipe buffer size: %m"); | |
912b54ad | 109 | |
8569a776 LP |
110 | assert(r > 0); |
111 | *sz = r; | |
112 | ||
912b54ad DS |
113 | return 0; |
114 | } | |
115 | ||
8569a776 LP |
116 | static int connection_shovel( |
117 | Connection *c, | |
118 | int *from, int buffer[2], int *to, | |
119 | size_t *full, size_t *sz, | |
120 | sd_event_source **from_source, sd_event_source **to_source) { | |
121 | ||
122 | bool shoveled; | |
123 | ||
124 | assert(c); | |
125 | assert(from); | |
126 | assert(buffer); | |
127 | assert(buffer[0] >= 0); | |
128 | assert(buffer[1] >= 0); | |
129 | assert(to); | |
130 | assert(full); | |
131 | assert(sz); | |
132 | assert(from_source); | |
133 | assert(to_source); | |
134 | ||
135 | do { | |
136 | ssize_t z; | |
137 | ||
138 | shoveled = false; | |
139 | ||
140 | if (*full < *sz && *from >= 0 && *to >= 0) { | |
141 | z = splice(*from, NULL, buffer[1], NULL, *sz - *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
142 | if (z > 0) { | |
143 | *full += z; | |
144 | shoveled = true; | |
f60a028a | 145 | } else if (z == 0 || ERRNO_IS_DISCONNECT(errno)) { |
8569a776 | 146 | *from_source = sd_event_source_unref(*from_source); |
03e334a1 | 147 | *from = safe_close(*from); |
ec2ce0c5 | 148 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 149 | return log_error_errno(errno, "Failed to splice: %m"); |
912b54ad DS |
150 | } |
151 | ||
8569a776 LP |
152 | if (*full > 0 && *to >= 0) { |
153 | z = splice(buffer[0], NULL, *to, NULL, *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
154 | if (z > 0) { | |
155 | *full -= z; | |
156 | shoveled = true; | |
f60a028a | 157 | } else if (z == 0 || ERRNO_IS_DISCONNECT(errno)) { |
8569a776 | 158 | *to_source = sd_event_source_unref(*to_source); |
03e334a1 | 159 | *to = safe_close(*to); |
ec2ce0c5 | 160 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 161 | return log_error_errno(errno, "Failed to splice: %m"); |
8569a776 LP |
162 | } |
163 | } while (shoveled); | |
912b54ad | 164 | |
8569a776 | 165 | return 0; |
912b54ad DS |
166 | } |
167 | ||
fb69d709 | 168 | static int connection_enable_event_sources(Connection *c); |
8569a776 LP |
169 | |
170 | static int traffic_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
171 | Connection *c = userdata; | |
912b54ad DS |
172 | int r; |
173 | ||
8569a776 LP |
174 | assert(s); |
175 | assert(fd >= 0); | |
176 | assert(c); | |
912b54ad | 177 | |
8569a776 LP |
178 | r = connection_shovel(c, |
179 | &c->server_fd, c->server_to_client_buffer, &c->client_fd, | |
180 | &c->server_to_client_buffer_full, &c->server_to_client_buffer_size, | |
181 | &c->server_event_source, &c->client_event_source); | |
182 | if (r < 0) | |
183 | goto quit; | |
912b54ad | 184 | |
8569a776 LP |
185 | r = connection_shovel(c, |
186 | &c->client_fd, c->client_to_server_buffer, &c->server_fd, | |
187 | &c->client_to_server_buffer_full, &c->client_to_server_buffer_size, | |
188 | &c->client_event_source, &c->server_event_source); | |
189 | if (r < 0) | |
190 | goto quit; | |
912b54ad | 191 | |
8569a776 LP |
192 | /* EOF on both sides? */ |
193 | if (c->server_fd == -1 && c->client_fd == -1) | |
194 | goto quit; | |
912b54ad | 195 | |
8569a776 LP |
196 | /* Server closed, and all data written to client? */ |
197 | if (c->server_fd == -1 && c->server_to_client_buffer_full <= 0) | |
198 | goto quit; | |
912b54ad | 199 | |
8569a776 LP |
200 | /* Client closed, and all data written to server? */ |
201 | if (c->client_fd == -1 && c->client_to_server_buffer_full <= 0) | |
202 | goto quit; | |
912b54ad | 203 | |
fb69d709 | 204 | r = connection_enable_event_sources(c); |
8569a776 LP |
205 | if (r < 0) |
206 | goto quit; | |
912b54ad | 207 | |
8569a776 | 208 | return 1; |
912b54ad | 209 | |
8569a776 LP |
210 | quit: |
211 | connection_free(c); | |
212 | return 0; /* ignore errors, continue serving */ | |
912b54ad DS |
213 | } |
214 | ||
fb69d709 | 215 | static int connection_enable_event_sources(Connection *c) { |
8569a776 LP |
216 | uint32_t a = 0, b = 0; |
217 | int r; | |
912b54ad | 218 | |
8569a776 | 219 | assert(c); |
912b54ad | 220 | |
8569a776 LP |
221 | if (c->server_to_client_buffer_full > 0) |
222 | b |= EPOLLOUT; | |
223 | if (c->server_to_client_buffer_full < c->server_to_client_buffer_size) | |
224 | a |= EPOLLIN; | |
912b54ad | 225 | |
8569a776 LP |
226 | if (c->client_to_server_buffer_full > 0) |
227 | a |= EPOLLOUT; | |
228 | if (c->client_to_server_buffer_full < c->client_to_server_buffer_size) | |
229 | b |= EPOLLIN; | |
912b54ad | 230 | |
8569a776 LP |
231 | if (c->server_event_source) |
232 | r = sd_event_source_set_io_events(c->server_event_source, a); | |
233 | else if (c->server_fd >= 0) | |
fb69d709 | 234 | r = sd_event_add_io(c->context->event, &c->server_event_source, c->server_fd, a, traffic_cb, c); |
8569a776 LP |
235 | else |
236 | r = 0; | |
237 | ||
f647962d MS |
238 | if (r < 0) |
239 | return log_error_errno(r, "Failed to set up server event source: %m"); | |
912b54ad | 240 | |
8569a776 LP |
241 | if (c->client_event_source) |
242 | r = sd_event_source_set_io_events(c->client_event_source, b); | |
243 | else if (c->client_fd >= 0) | |
fb69d709 | 244 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, b, traffic_cb, c); |
8569a776 LP |
245 | else |
246 | r = 0; | |
912b54ad | 247 | |
f647962d MS |
248 | if (r < 0) |
249 | return log_error_errno(r, "Failed to set up client event source: %m"); | |
912b54ad | 250 | |
8569a776 | 251 | return 0; |
912b54ad DS |
252 | } |
253 | ||
fb69d709 LP |
254 | static int connection_complete(Connection *c) { |
255 | int r; | |
256 | ||
257 | assert(c); | |
258 | ||
259 | r = connection_create_pipes(c, c->server_to_client_buffer, &c->server_to_client_buffer_size); | |
260 | if (r < 0) | |
261 | goto fail; | |
262 | ||
263 | r = connection_create_pipes(c, c->client_to_server_buffer, &c->client_to_server_buffer_size); | |
264 | if (r < 0) | |
265 | goto fail; | |
266 | ||
267 | r = connection_enable_event_sources(c); | |
268 | if (r < 0) | |
269 | goto fail; | |
270 | ||
271 | return 0; | |
272 | ||
273 | fail: | |
274 | connection_free(c); | |
275 | return 0; /* ignore errors, continue serving */ | |
276 | } | |
277 | ||
8569a776 LP |
278 | static int connect_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
279 | Connection *c = userdata; | |
280 | socklen_t solen; | |
281 | int error, r; | |
282 | ||
283 | assert(s); | |
284 | assert(fd >= 0); | |
285 | assert(c); | |
286 | ||
287 | solen = sizeof(error); | |
288 | r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &solen); | |
289 | if (r < 0) { | |
56f64d95 | 290 | log_error_errno(errno, "Failed to issue SO_ERROR: %m"); |
40976028 DS |
291 | goto fail; |
292 | } | |
912b54ad | 293 | |
8569a776 | 294 | if (error != 0) { |
279d3c9c | 295 | log_error_errno(error, "Failed to connect to remote host: %m"); |
912b54ad DS |
296 | goto fail; |
297 | } | |
298 | ||
8569a776 LP |
299 | c->client_event_source = sd_event_source_unref(c->client_event_source); |
300 | ||
fb69d709 | 301 | return connection_complete(c); |
912b54ad | 302 | |
fb69d709 LP |
303 | fail: |
304 | connection_free(c); | |
305 | return 0; /* ignore errors, continue serving */ | |
306 | } | |
912b54ad | 307 | |
fb69d709 LP |
308 | static int connection_start(Connection *c, struct sockaddr *sa, socklen_t salen) { |
309 | int r; | |
310 | ||
311 | assert(c); | |
312 | assert(sa); | |
313 | assert(salen); | |
314 | ||
315 | c->client_fd = socket(sa->sa_family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
316 | if (c->client_fd < 0) { | |
56f64d95 | 317 | log_error_errno(errno, "Failed to get remote socket: %m"); |
8569a776 | 318 | goto fail; |
fb69d709 LP |
319 | } |
320 | ||
321 | r = connect(c->client_fd, sa, salen); | |
322 | if (r < 0) { | |
323 | if (errno == EINPROGRESS) { | |
324 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, EPOLLOUT, connect_cb, c); | |
325 | if (r < 0) { | |
da927ba9 | 326 | log_error_errno(r, "Failed to add connection socket: %m"); |
fb69d709 LP |
327 | goto fail; |
328 | } | |
329 | ||
330 | r = sd_event_source_set_enabled(c->client_event_source, SD_EVENT_ONESHOT); | |
331 | if (r < 0) { | |
da927ba9 | 332 | log_error_errno(r, "Failed to enable oneshot event source: %m"); |
fb69d709 LP |
333 | goto fail; |
334 | } | |
335 | } else { | |
56f64d95 | 336 | log_error_errno(errno, "Failed to connect to remote host: %m"); |
fb69d709 LP |
337 | goto fail; |
338 | } | |
339 | } else { | |
340 | r = connection_complete(c); | |
341 | if (r < 0) | |
342 | goto fail; | |
343 | } | |
912b54ad | 344 | |
8569a776 | 345 | return 0; |
912b54ad | 346 | |
8569a776 LP |
347 | fail: |
348 | connection_free(c); | |
349 | return 0; /* ignore errors, continue serving */ | |
350 | } | |
351 | ||
f2935c77 | 352 | static int resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, Connection *c) { |
fb69d709 LP |
353 | assert(q); |
354 | assert(c); | |
355 | ||
356 | if (ret != 0) { | |
357 | log_error("Failed to resolve host: %s", gai_strerror(ret)); | |
358 | goto fail; | |
359 | } | |
360 | ||
361 | c->resolve_query = sd_resolve_query_unref(c->resolve_query); | |
362 | ||
363 | return connection_start(c, ai->ai_addr, ai->ai_addrlen); | |
364 | ||
365 | fail: | |
366 | connection_free(c); | |
367 | return 0; /* ignore errors, continue serving */ | |
368 | } | |
369 | ||
370 | static int resolve_remote(Connection *c) { | |
371 | ||
372 | static const struct addrinfo hints = { | |
373 | .ai_family = AF_UNSPEC, | |
374 | .ai_socktype = SOCK_STREAM, | |
375 | .ai_flags = AI_ADDRCONFIG | |
376 | }; | |
377 | ||
1ec6af16 | 378 | union sockaddr_union sa = {}; |
fb69d709 | 379 | const char *node, *service; |
fb69d709 LP |
380 | int r; |
381 | ||
15a3e96f LP |
382 | if (IN_SET(arg_remote_host[0], '/', '@')) { |
383 | int salen; | |
384 | ||
385 | salen = sockaddr_un_set_path(&sa.un, arg_remote_host); | |
386 | if (salen < 0) { | |
387 | log_error_errno(salen, "Specified address doesn't fit in an AF_UNIX address, refusing: %m"); | |
388 | goto fail; | |
389 | } | |
fb69d709 | 390 | |
15a3e96f | 391 | return connection_start(c, &sa.sa, salen); |
fb69d709 LP |
392 | } |
393 | ||
394 | service = strrchr(arg_remote_host, ':'); | |
395 | if (service) { | |
396 | node = strndupa(arg_remote_host, service - arg_remote_host); | |
313cefa1 | 397 | service++; |
fb69d709 LP |
398 | } else { |
399 | node = arg_remote_host; | |
400 | service = "80"; | |
401 | } | |
402 | ||
403 | log_debug("Looking up address info for %s:%s", node, service); | |
f2935c77 | 404 | r = resolve_getaddrinfo(c->context->resolve, &c->resolve_query, node, service, &hints, resolve_handler, NULL, c); |
fb69d709 | 405 | if (r < 0) { |
da927ba9 | 406 | log_error_errno(r, "Failed to resolve remote host: %m"); |
fb69d709 LP |
407 | goto fail; |
408 | } | |
409 | ||
410 | return 0; | |
411 | ||
412 | fail: | |
413 | connection_free(c); | |
414 | return 0; /* ignore errors, continue serving */ | |
415 | } | |
416 | ||
417 | static int add_connection_socket(Context *context, int fd) { | |
8569a776 LP |
418 | Connection *c; |
419 | int r; | |
420 | ||
421 | assert(context); | |
8569a776 LP |
422 | assert(fd >= 0); |
423 | ||
dc3b8afb | 424 | if (set_size(context->connections) > arg_connections_max) { |
8569a776 | 425 | log_warning("Hit connection limit, refusing connection."); |
03e334a1 | 426 | safe_close(fd); |
8569a776 | 427 | return 0; |
912b54ad DS |
428 | } |
429 | ||
d5099efc | 430 | r = set_ensure_allocated(&context->connections, NULL); |
fb69d709 LP |
431 | if (r < 0) { |
432 | log_oom(); | |
433 | return 0; | |
434 | } | |
912b54ad | 435 | |
8569a776 | 436 | c = new0(Connection, 1); |
fb69d709 LP |
437 | if (!c) { |
438 | log_oom(); | |
439 | return 0; | |
440 | } | |
8569a776 | 441 | |
e633ea1c | 442 | c->context = context; |
8569a776 LP |
443 | c->server_fd = fd; |
444 | c->client_fd = -1; | |
445 | c->server_to_client_buffer[0] = c->server_to_client_buffer[1] = -1; | |
446 | c->client_to_server_buffer[0] = c->client_to_server_buffer[1] = -1; | |
447 | ||
e633ea1c LP |
448 | r = set_put(context->connections, c); |
449 | if (r < 0) { | |
450 | free(c); | |
fb69d709 LP |
451 | log_oom(); |
452 | return 0; | |
8569a776 | 453 | } |
912b54ad | 454 | |
fb69d709 | 455 | return resolve_remote(c); |
40976028 DS |
456 | } |
457 | ||
458 | static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
7b77ed8c | 459 | _cleanup_free_ char *peer = NULL; |
8569a776 LP |
460 | Context *context = userdata; |
461 | int nfd = -1, r; | |
40976028 | 462 | |
8569a776 LP |
463 | assert(s); |
464 | assert(fd >= 0); | |
40976028 | 465 | assert(revents & EPOLLIN); |
8569a776 LP |
466 | assert(context); |
467 | ||
468 | nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
7b77ed8c | 469 | if (nfd < 0) { |
4ff9bc2e | 470 | if (!ERRNO_IS_ACCEPT_AGAIN(errno)) |
56f64d95 | 471 | log_warning_errno(errno, "Failed to accept() socket: %m"); |
7b77ed8c | 472 | } else { |
7ebd758c | 473 | (void) getpeername_pretty(nfd, true, &peer); |
8569a776 | 474 | log_debug("New connection from %s", strna(peer)); |
40976028 | 475 | |
fb69d709 | 476 | r = add_connection_socket(context, nfd); |
f4bd42aa | 477 | if (r < 0) { |
da927ba9 | 478 | log_error_errno(r, "Failed to accept connection, ignoring: %m"); |
03e334a1 | 479 | safe_close(fd); |
f4bd42aa | 480 | } |
7b77ed8c | 481 | } |
8569a776 | 482 | |
40976028 DS |
483 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); |
484 | if (r < 0) { | |
da927ba9 | 485 | log_error_errno(r, "Error while re-enabling listener with ONESHOT: %m"); |
fb69d709 | 486 | sd_event_exit(context->event, r); |
40976028 DS |
487 | return r; |
488 | } | |
489 | ||
96c374d0 | 490 | return 1; |
912b54ad DS |
491 | } |
492 | ||
fb69d709 | 493 | static int add_listen_socket(Context *context, int fd) { |
8569a776 LP |
494 | sd_event_source *source; |
495 | int r; | |
496 | ||
497 | assert(context); | |
8569a776 | 498 | assert(fd >= 0); |
912b54ad | 499 | |
d5099efc | 500 | r = set_ensure_allocated(&context->listen, NULL); |
96c374d0 | 501 | if (r < 0) { |
8569a776 LP |
502 | log_oom(); |
503 | return r; | |
504 | } | |
505 | ||
506 | r = sd_is_socket(fd, 0, SOCK_STREAM, 1); | |
f647962d MS |
507 | if (r < 0) |
508 | return log_error_errno(r, "Failed to determine socket type: %m"); | |
baaa35ad ZJS |
509 | if (r == 0) |
510 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
511 | "Passed in socket is not a stream socket."); | |
912b54ad | 512 | |
8569a776 | 513 | r = fd_nonblock(fd, true); |
f647962d MS |
514 | if (r < 0) |
515 | return log_error_errno(r, "Failed to mark file descriptor non-blocking: %m"); | |
912b54ad | 516 | |
fb69d709 | 517 | r = sd_event_add_io(context->event, &source, fd, EPOLLIN, accept_cb, context); |
f647962d MS |
518 | if (r < 0) |
519 | return log_error_errno(r, "Failed to add event source: %m"); | |
912b54ad | 520 | |
8569a776 | 521 | r = set_put(context->listen, source); |
96c374d0 | 522 | if (r < 0) { |
da927ba9 | 523 | log_error_errno(r, "Failed to add source to set: %m"); |
8569a776 | 524 | sd_event_source_unref(source); |
40976028 DS |
525 | return r; |
526 | } | |
527 | ||
528 | /* Set the watcher to oneshot in case other processes are also | |
529 | * watching to accept(). */ | |
8569a776 | 530 | r = sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); |
f647962d MS |
531 | if (r < 0) |
532 | return log_error_errno(r, "Failed to enable oneshot mode: %m"); | |
912b54ad | 533 | |
8569a776 | 534 | return 0; |
912b54ad DS |
535 | } |
536 | ||
37ec0fdd LP |
537 | static int help(void) { |
538 | _cleanup_free_ char *link = NULL; | |
539 | int r; | |
540 | ||
541 | r = terminal_urlify_man("systemd-socket-proxyd", "8", &link); | |
542 | if (r < 0) | |
543 | return log_oom(); | |
544 | ||
601185b4 ZJS |
545 | printf("%1$s [HOST:PORT]\n" |
546 | "%1$s [SOCKET]\n\n" | |
8569a776 | 547 | "Bidirectionally proxy local sockets to another (possibly remote) socket.\n\n" |
23d0fff7 | 548 | " -c --connections-max= Set the maximum number of connections to be accepted\n" |
8cf030b3 | 549 | " -h --help Show this help\n" |
37ec0fdd LP |
550 | " --version Show package version\n" |
551 | "\nSee the %2$s for details.\n" | |
552 | , program_invocation_short_name | |
553 | , link | |
554 | ); | |
555 | ||
556 | return 0; | |
912b54ad DS |
557 | } |
558 | ||
8569a776 | 559 | static int parse_argv(int argc, char *argv[]) { |
912b54ad DS |
560 | |
561 | enum { | |
8cf030b3 LP |
562 | ARG_VERSION = 0x100, |
563 | ARG_IGNORE_ENV | |
912b54ad DS |
564 | }; |
565 | ||
566 | static const struct option options[] = { | |
dc3b8afb DK |
567 | { "connections-max", required_argument, NULL, 'c' }, |
568 | { "help", no_argument, NULL, 'h' }, | |
569 | { "version", no_argument, NULL, ARG_VERSION }, | |
eb9da376 | 570 | {} |
912b54ad DS |
571 | }; |
572 | ||
dc3b8afb | 573 | int c, r; |
912b54ad DS |
574 | |
575 | assert(argc >= 0); | |
576 | assert(argv); | |
577 | ||
dc3b8afb | 578 | while ((c = getopt_long(argc, argv, "c:h", options, NULL)) >= 0) |
912b54ad DS |
579 | |
580 | switch (c) { | |
581 | ||
582 | case 'h': | |
37ec0fdd LP |
583 | return help(); |
584 | ||
585 | case ARG_VERSION: | |
586 | return version(); | |
912b54ad | 587 | |
dc3b8afb DK |
588 | case 'c': |
589 | r = safe_atou(optarg, &arg_connections_max); | |
590 | if (r < 0) { | |
591 | log_error("Failed to parse --connections-max= argument: %s", optarg); | |
592 | return r; | |
593 | } | |
594 | ||
baaa35ad ZJS |
595 | if (arg_connections_max < 1) |
596 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
597 | "Connection limit is too low."); | |
dc3b8afb DK |
598 | |
599 | break; | |
600 | ||
eb9da376 | 601 | case '?': |
912b54ad | 602 | return -EINVAL; |
eb9da376 LP |
603 | |
604 | default: | |
605 | assert_not_reached("Unhandled option"); | |
912b54ad | 606 | } |
912b54ad | 607 | |
baaa35ad ZJS |
608 | if (optind >= argc) |
609 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
610 | "Not enough parameters."); | |
912b54ad | 611 | |
baaa35ad ZJS |
612 | if (argc != optind+1) |
613 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
614 | "Too many parameters."); | |
912b54ad | 615 | |
8569a776 | 616 | arg_remote_host = argv[optind]; |
912b54ad DS |
617 | return 1; |
618 | } | |
619 | ||
a160567e YW |
620 | static int run(int argc, char *argv[]) { |
621 | _cleanup_(context_clear) Context context = {}; | |
8569a776 | 622 | int r, n, fd; |
912b54ad DS |
623 | |
624 | log_parse_environment(); | |
625 | log_open(); | |
626 | ||
8569a776 | 627 | r = parse_argv(argc, argv); |
912b54ad | 628 | if (r <= 0) |
a160567e | 629 | return r; |
912b54ad | 630 | |
fb69d709 | 631 | r = sd_event_default(&context.event); |
a160567e YW |
632 | if (r < 0) |
633 | return log_error_errno(r, "Failed to allocate event loop: %m"); | |
912b54ad | 634 | |
fb69d709 | 635 | r = sd_resolve_default(&context.resolve); |
a160567e YW |
636 | if (r < 0) |
637 | return log_error_errno(r, "Failed to allocate resolver: %m"); | |
fb69d709 LP |
638 | |
639 | r = sd_resolve_attach_event(context.resolve, context.event, 0); | |
a160567e YW |
640 | if (r < 0) |
641 | return log_error_errno(r, "Failed to attach resolver: %m"); | |
fb69d709 LP |
642 | |
643 | sd_event_set_watchdog(context.event, true); | |
cde93897 | 644 | |
a160567e YW |
645 | r = sd_listen_fds(1); |
646 | if (r < 0) | |
647 | return log_error_errno(r, "Failed to receive sockets from parent."); | |
648 | if (r == 0) | |
649 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Didn't get any sockets passed in."); | |
650 | ||
651 | n = r; | |
8cf030b3 LP |
652 | |
653 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
fb69d709 | 654 | r = add_listen_socket(&context, fd); |
8569a776 | 655 | if (r < 0) |
a160567e | 656 | return r; |
912b54ad DS |
657 | } |
658 | ||
fb69d709 | 659 | r = sd_event_loop(context.event); |
a160567e YW |
660 | if (r < 0) |
661 | return log_error_errno(r, "Failed to run event loop: %m"); | |
8569a776 | 662 | |
a160567e | 663 | return 0; |
912b54ad | 664 | } |
a160567e YW |
665 | |
666 | DEFINE_MAIN_FUNCTION(run); |