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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
912b54ad | 2 | /*** |
912b54ad | 3 | Copyright 2013 David Strauss |
912b54ad DS |
4 | ***/ |
5 | ||
912b54ad | 6 | #include <errno.h> |
3f6fd1ba | 7 | #include <fcntl.h> |
912b54ad | 8 | #include <getopt.h> |
3f6fd1ba | 9 | #include <netdb.h> |
912b54ad DS |
10 | #include <stdio.h> |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
912b54ad DS |
13 | #include <sys/socket.h> |
14 | #include <sys/un.h> | |
15 | #include <unistd.h> | |
16 | ||
912b54ad DS |
17 | #include "sd-daemon.h" |
18 | #include "sd-event.h" | |
fb69d709 | 19 | #include "sd-resolve.h" |
3f6fd1ba | 20 | |
b5efdb8a | 21 | #include "alloc-util.h" |
3ffd4af2 | 22 | #include "fd-util.h" |
96c374d0 | 23 | #include "log.h" |
3f6fd1ba LP |
24 | #include "path-util.h" |
25 | #include "set.h" | |
912b54ad | 26 | #include "socket-util.h" |
07630cea | 27 | #include "string-util.h" |
dc3b8afb | 28 | #include "parse-util.h" |
912b54ad | 29 | #include "util.h" |
8569a776 LP |
30 | |
31 | #define BUFFER_SIZE (256 * 1024) | |
dc3b8afb | 32 | static unsigned arg_connections_max = 256; |
912b54ad | 33 | |
fb69d709 LP |
34 | static const char *arg_remote_host = NULL; |
35 | ||
8569a776 | 36 | typedef struct Context { |
fb69d709 LP |
37 | sd_event *event; |
38 | sd_resolve *resolve; | |
39 | ||
8569a776 LP |
40 | Set *listen; |
41 | Set *connections; | |
42 | } Context; | |
912b54ad | 43 | |
8569a776 | 44 | typedef struct Connection { |
e633ea1c LP |
45 | Context *context; |
46 | ||
8569a776 LP |
47 | int server_fd, client_fd; |
48 | int server_to_client_buffer[2]; /* a pipe */ | |
49 | int client_to_server_buffer[2]; /* a pipe */ | |
912b54ad | 50 | |
8569a776 LP |
51 | size_t server_to_client_buffer_full, client_to_server_buffer_full; |
52 | size_t server_to_client_buffer_size, client_to_server_buffer_size; | |
53 | ||
54 | sd_event_source *server_event_source, *client_event_source; | |
912b54ad | 55 | |
fb69d709 LP |
56 | sd_resolve_query *resolve_query; |
57 | } Connection; | |
912b54ad | 58 | |
8569a776 LP |
59 | static void connection_free(Connection *c) { |
60 | assert(c); | |
32d3c809 | 61 | |
e633ea1c LP |
62 | if (c->context) |
63 | set_remove(c->context->connections, c); | |
64 | ||
8569a776 LP |
65 | sd_event_source_unref(c->server_event_source); |
66 | sd_event_source_unref(c->client_event_source); | |
32d3c809 | 67 | |
03e334a1 LP |
68 | safe_close(c->server_fd); |
69 | safe_close(c->client_fd); | |
32d3c809 | 70 | |
3d94f76c LP |
71 | safe_close_pair(c->server_to_client_buffer); |
72 | safe_close_pair(c->client_to_server_buffer); | |
32d3c809 | 73 | |
fb69d709 LP |
74 | sd_resolve_query_unref(c->resolve_query); |
75 | ||
8569a776 LP |
76 | free(c); |
77 | } | |
32d3c809 | 78 | |
8569a776 | 79 | static void context_free(Context *context) { |
8569a776 LP |
80 | assert(context); |
81 | ||
224b0e7a ZJS |
82 | set_free_with_destructor(context->listen, sd_event_source_unref); |
83 | set_free_with_destructor(context->connections, connection_free); | |
32d3c809 | 84 | |
fb69d709 LP |
85 | sd_event_unref(context->event); |
86 | sd_resolve_unref(context->resolve); | |
8569a776 | 87 | } |
912b54ad | 88 | |
8569a776 LP |
89 | static int connection_create_pipes(Connection *c, int buffer[2], size_t *sz) { |
90 | int r; | |
912b54ad | 91 | |
8569a776 LP |
92 | assert(c); |
93 | assert(buffer); | |
94 | assert(sz); | |
912b54ad | 95 | |
8569a776 LP |
96 | if (buffer[0] >= 0) |
97 | return 0; | |
912b54ad | 98 | |
8569a776 | 99 | r = pipe2(buffer, O_CLOEXEC|O_NONBLOCK); |
4a62c710 MS |
100 | if (r < 0) |
101 | return log_error_errno(errno, "Failed to allocate pipe buffer: %m"); | |
912b54ad | 102 | |
25dbe4f5 | 103 | (void) fcntl(buffer[0], F_SETPIPE_SZ, BUFFER_SIZE); |
8569a776 LP |
104 | |
105 | r = fcntl(buffer[0], F_GETPIPE_SZ); | |
4a62c710 MS |
106 | if (r < 0) |
107 | return log_error_errno(errno, "Failed to get pipe buffer size: %m"); | |
912b54ad | 108 | |
8569a776 LP |
109 | assert(r > 0); |
110 | *sz = r; | |
111 | ||
912b54ad DS |
112 | return 0; |
113 | } | |
114 | ||
8569a776 LP |
115 | static int connection_shovel( |
116 | Connection *c, | |
117 | int *from, int buffer[2], int *to, | |
118 | size_t *full, size_t *sz, | |
119 | sd_event_source **from_source, sd_event_source **to_source) { | |
120 | ||
121 | bool shoveled; | |
122 | ||
123 | assert(c); | |
124 | assert(from); | |
125 | assert(buffer); | |
126 | assert(buffer[0] >= 0); | |
127 | assert(buffer[1] >= 0); | |
128 | assert(to); | |
129 | assert(full); | |
130 | assert(sz); | |
131 | assert(from_source); | |
132 | assert(to_source); | |
133 | ||
134 | do { | |
135 | ssize_t z; | |
136 | ||
137 | shoveled = false; | |
138 | ||
139 | if (*full < *sz && *from >= 0 && *to >= 0) { | |
140 | z = splice(*from, NULL, buffer[1], NULL, *sz - *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
141 | if (z > 0) { | |
142 | *full += z; | |
143 | shoveled = true; | |
4c701096 | 144 | } else if (z == 0 || IN_SET(errno, EPIPE, ECONNRESET)) { |
8569a776 | 145 | *from_source = sd_event_source_unref(*from_source); |
03e334a1 | 146 | *from = safe_close(*from); |
ec2ce0c5 | 147 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 148 | return log_error_errno(errno, "Failed to splice: %m"); |
912b54ad DS |
149 | } |
150 | ||
8569a776 LP |
151 | if (*full > 0 && *to >= 0) { |
152 | z = splice(buffer[0], NULL, *to, NULL, *full, SPLICE_F_MOVE|SPLICE_F_NONBLOCK); | |
153 | if (z > 0) { | |
154 | *full -= z; | |
155 | shoveled = true; | |
4c701096 | 156 | } else if (z == 0 || IN_SET(errno, EPIPE, ECONNRESET)) { |
8569a776 | 157 | *to_source = sd_event_source_unref(*to_source); |
03e334a1 | 158 | *to = safe_close(*to); |
ec2ce0c5 | 159 | } else if (!IN_SET(errno, EAGAIN, EINTR)) |
4a62c710 | 160 | return log_error_errno(errno, "Failed to splice: %m"); |
8569a776 LP |
161 | } |
162 | } while (shoveled); | |
912b54ad | 163 | |
8569a776 | 164 | return 0; |
912b54ad DS |
165 | } |
166 | ||
fb69d709 | 167 | static int connection_enable_event_sources(Connection *c); |
8569a776 LP |
168 | |
169 | static int traffic_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
170 | Connection *c = userdata; | |
912b54ad DS |
171 | int r; |
172 | ||
8569a776 LP |
173 | assert(s); |
174 | assert(fd >= 0); | |
175 | assert(c); | |
912b54ad | 176 | |
8569a776 LP |
177 | r = connection_shovel(c, |
178 | &c->server_fd, c->server_to_client_buffer, &c->client_fd, | |
179 | &c->server_to_client_buffer_full, &c->server_to_client_buffer_size, | |
180 | &c->server_event_source, &c->client_event_source); | |
181 | if (r < 0) | |
182 | goto quit; | |
912b54ad | 183 | |
8569a776 LP |
184 | r = connection_shovel(c, |
185 | &c->client_fd, c->client_to_server_buffer, &c->server_fd, | |
186 | &c->client_to_server_buffer_full, &c->client_to_server_buffer_size, | |
187 | &c->client_event_source, &c->server_event_source); | |
188 | if (r < 0) | |
189 | goto quit; | |
912b54ad | 190 | |
8569a776 LP |
191 | /* EOF on both sides? */ |
192 | if (c->server_fd == -1 && c->client_fd == -1) | |
193 | goto quit; | |
912b54ad | 194 | |
8569a776 LP |
195 | /* Server closed, and all data written to client? */ |
196 | if (c->server_fd == -1 && c->server_to_client_buffer_full <= 0) | |
197 | goto quit; | |
912b54ad | 198 | |
8569a776 LP |
199 | /* Client closed, and all data written to server? */ |
200 | if (c->client_fd == -1 && c->client_to_server_buffer_full <= 0) | |
201 | goto quit; | |
912b54ad | 202 | |
fb69d709 | 203 | r = connection_enable_event_sources(c); |
8569a776 LP |
204 | if (r < 0) |
205 | goto quit; | |
912b54ad | 206 | |
8569a776 | 207 | return 1; |
912b54ad | 208 | |
8569a776 LP |
209 | quit: |
210 | connection_free(c); | |
211 | return 0; /* ignore errors, continue serving */ | |
912b54ad DS |
212 | } |
213 | ||
fb69d709 | 214 | static int connection_enable_event_sources(Connection *c) { |
8569a776 LP |
215 | uint32_t a = 0, b = 0; |
216 | int r; | |
912b54ad | 217 | |
8569a776 | 218 | assert(c); |
912b54ad | 219 | |
8569a776 LP |
220 | if (c->server_to_client_buffer_full > 0) |
221 | b |= EPOLLOUT; | |
222 | if (c->server_to_client_buffer_full < c->server_to_client_buffer_size) | |
223 | a |= EPOLLIN; | |
912b54ad | 224 | |
8569a776 LP |
225 | if (c->client_to_server_buffer_full > 0) |
226 | a |= EPOLLOUT; | |
227 | if (c->client_to_server_buffer_full < c->client_to_server_buffer_size) | |
228 | b |= EPOLLIN; | |
912b54ad | 229 | |
8569a776 LP |
230 | if (c->server_event_source) |
231 | r = sd_event_source_set_io_events(c->server_event_source, a); | |
232 | else if (c->server_fd >= 0) | |
fb69d709 | 233 | r = sd_event_add_io(c->context->event, &c->server_event_source, c->server_fd, a, traffic_cb, c); |
8569a776 LP |
234 | else |
235 | r = 0; | |
236 | ||
f647962d MS |
237 | if (r < 0) |
238 | return log_error_errno(r, "Failed to set up server event source: %m"); | |
912b54ad | 239 | |
8569a776 LP |
240 | if (c->client_event_source) |
241 | r = sd_event_source_set_io_events(c->client_event_source, b); | |
242 | else if (c->client_fd >= 0) | |
fb69d709 | 243 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, b, traffic_cb, c); |
8569a776 LP |
244 | else |
245 | r = 0; | |
912b54ad | 246 | |
f647962d MS |
247 | if (r < 0) |
248 | return log_error_errno(r, "Failed to set up client event source: %m"); | |
912b54ad | 249 | |
8569a776 | 250 | return 0; |
912b54ad DS |
251 | } |
252 | ||
fb69d709 LP |
253 | static int connection_complete(Connection *c) { |
254 | int r; | |
255 | ||
256 | assert(c); | |
257 | ||
258 | r = connection_create_pipes(c, c->server_to_client_buffer, &c->server_to_client_buffer_size); | |
259 | if (r < 0) | |
260 | goto fail; | |
261 | ||
262 | r = connection_create_pipes(c, c->client_to_server_buffer, &c->client_to_server_buffer_size); | |
263 | if (r < 0) | |
264 | goto fail; | |
265 | ||
266 | r = connection_enable_event_sources(c); | |
267 | if (r < 0) | |
268 | goto fail; | |
269 | ||
270 | return 0; | |
271 | ||
272 | fail: | |
273 | connection_free(c); | |
274 | return 0; /* ignore errors, continue serving */ | |
275 | } | |
276 | ||
8569a776 LP |
277 | static int connect_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
278 | Connection *c = userdata; | |
279 | socklen_t solen; | |
280 | int error, r; | |
281 | ||
282 | assert(s); | |
283 | assert(fd >= 0); | |
284 | assert(c); | |
285 | ||
286 | solen = sizeof(error); | |
287 | r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &solen); | |
288 | if (r < 0) { | |
56f64d95 | 289 | log_error_errno(errno, "Failed to issue SO_ERROR: %m"); |
40976028 DS |
290 | goto fail; |
291 | } | |
912b54ad | 292 | |
8569a776 | 293 | if (error != 0) { |
279d3c9c | 294 | log_error_errno(error, "Failed to connect to remote host: %m"); |
912b54ad DS |
295 | goto fail; |
296 | } | |
297 | ||
8569a776 LP |
298 | c->client_event_source = sd_event_source_unref(c->client_event_source); |
299 | ||
fb69d709 | 300 | return connection_complete(c); |
912b54ad | 301 | |
fb69d709 LP |
302 | fail: |
303 | connection_free(c); | |
304 | return 0; /* ignore errors, continue serving */ | |
305 | } | |
912b54ad | 306 | |
fb69d709 LP |
307 | static int connection_start(Connection *c, struct sockaddr *sa, socklen_t salen) { |
308 | int r; | |
309 | ||
310 | assert(c); | |
311 | assert(sa); | |
312 | assert(salen); | |
313 | ||
314 | c->client_fd = socket(sa->sa_family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
315 | if (c->client_fd < 0) { | |
56f64d95 | 316 | log_error_errno(errno, "Failed to get remote socket: %m"); |
8569a776 | 317 | goto fail; |
fb69d709 LP |
318 | } |
319 | ||
320 | r = connect(c->client_fd, sa, salen); | |
321 | if (r < 0) { | |
322 | if (errno == EINPROGRESS) { | |
323 | r = sd_event_add_io(c->context->event, &c->client_event_source, c->client_fd, EPOLLOUT, connect_cb, c); | |
324 | if (r < 0) { | |
da927ba9 | 325 | log_error_errno(r, "Failed to add connection socket: %m"); |
fb69d709 LP |
326 | goto fail; |
327 | } | |
328 | ||
329 | r = sd_event_source_set_enabled(c->client_event_source, SD_EVENT_ONESHOT); | |
330 | if (r < 0) { | |
da927ba9 | 331 | log_error_errno(r, "Failed to enable oneshot event source: %m"); |
fb69d709 LP |
332 | goto fail; |
333 | } | |
334 | } else { | |
56f64d95 | 335 | log_error_errno(errno, "Failed to connect to remote host: %m"); |
fb69d709 LP |
336 | goto fail; |
337 | } | |
338 | } else { | |
339 | r = connection_complete(c); | |
340 | if (r < 0) | |
341 | goto fail; | |
342 | } | |
912b54ad | 343 | |
8569a776 | 344 | return 0; |
912b54ad | 345 | |
8569a776 LP |
346 | fail: |
347 | connection_free(c); | |
348 | return 0; /* ignore errors, continue serving */ | |
349 | } | |
350 | ||
fb69d709 LP |
351 | static int resolve_cb(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { |
352 | Connection *c = userdata; | |
353 | ||
354 | assert(q); | |
355 | assert(c); | |
356 | ||
357 | if (ret != 0) { | |
358 | log_error("Failed to resolve host: %s", gai_strerror(ret)); | |
359 | goto fail; | |
360 | } | |
361 | ||
362 | c->resolve_query = sd_resolve_query_unref(c->resolve_query); | |
363 | ||
364 | return connection_start(c, ai->ai_addr, ai->ai_addrlen); | |
365 | ||
366 | fail: | |
367 | connection_free(c); | |
368 | return 0; /* ignore errors, continue serving */ | |
369 | } | |
370 | ||
371 | static int resolve_remote(Connection *c) { | |
372 | ||
373 | static const struct addrinfo hints = { | |
374 | .ai_family = AF_UNSPEC, | |
375 | .ai_socktype = SOCK_STREAM, | |
376 | .ai_flags = AI_ADDRCONFIG | |
377 | }; | |
378 | ||
1ec6af16 | 379 | union sockaddr_union sa = {}; |
fb69d709 | 380 | const char *node, *service; |
fb69d709 LP |
381 | int r; |
382 | ||
383 | if (path_is_absolute(arg_remote_host)) { | |
384 | sa.un.sun_family = AF_UNIX; | |
fc2fffe7 LP |
385 | strncpy(sa.un.sun_path, arg_remote_host, sizeof(sa.un.sun_path)); |
386 | return connection_start(c, &sa.sa, SOCKADDR_UN_LEN(sa.un)); | |
fb69d709 LP |
387 | } |
388 | ||
389 | if (arg_remote_host[0] == '@') { | |
390 | sa.un.sun_family = AF_UNIX; | |
391 | sa.un.sun_path[0] = 0; | |
fc2fffe7 LP |
392 | strncpy(sa.un.sun_path+1, arg_remote_host+1, sizeof(sa.un.sun_path)-1); |
393 | return connection_start(c, &sa.sa, SOCKADDR_UN_LEN(sa.un)); | |
fb69d709 LP |
394 | } |
395 | ||
396 | service = strrchr(arg_remote_host, ':'); | |
397 | if (service) { | |
398 | node = strndupa(arg_remote_host, service - arg_remote_host); | |
313cefa1 | 399 | service++; |
fb69d709 LP |
400 | } else { |
401 | node = arg_remote_host; | |
402 | service = "80"; | |
403 | } | |
404 | ||
405 | log_debug("Looking up address info for %s:%s", node, service); | |
406 | r = sd_resolve_getaddrinfo(c->context->resolve, &c->resolve_query, node, service, &hints, resolve_cb, c); | |
407 | if (r < 0) { | |
da927ba9 | 408 | log_error_errno(r, "Failed to resolve remote host: %m"); |
fb69d709 LP |
409 | goto fail; |
410 | } | |
411 | ||
412 | return 0; | |
413 | ||
414 | fail: | |
415 | connection_free(c); | |
416 | return 0; /* ignore errors, continue serving */ | |
417 | } | |
418 | ||
419 | static int add_connection_socket(Context *context, int fd) { | |
8569a776 LP |
420 | Connection *c; |
421 | int r; | |
422 | ||
423 | assert(context); | |
8569a776 LP |
424 | assert(fd >= 0); |
425 | ||
dc3b8afb | 426 | if (set_size(context->connections) > arg_connections_max) { |
8569a776 | 427 | log_warning("Hit connection limit, refusing connection."); |
03e334a1 | 428 | safe_close(fd); |
8569a776 | 429 | return 0; |
912b54ad DS |
430 | } |
431 | ||
d5099efc | 432 | r = set_ensure_allocated(&context->connections, NULL); |
fb69d709 LP |
433 | if (r < 0) { |
434 | log_oom(); | |
435 | return 0; | |
436 | } | |
912b54ad | 437 | |
8569a776 | 438 | c = new0(Connection, 1); |
fb69d709 LP |
439 | if (!c) { |
440 | log_oom(); | |
441 | return 0; | |
442 | } | |
8569a776 | 443 | |
e633ea1c | 444 | c->context = context; |
8569a776 LP |
445 | c->server_fd = fd; |
446 | c->client_fd = -1; | |
447 | c->server_to_client_buffer[0] = c->server_to_client_buffer[1] = -1; | |
448 | c->client_to_server_buffer[0] = c->client_to_server_buffer[1] = -1; | |
449 | ||
e633ea1c LP |
450 | r = set_put(context->connections, c); |
451 | if (r < 0) { | |
452 | free(c); | |
fb69d709 LP |
453 | log_oom(); |
454 | return 0; | |
8569a776 | 455 | } |
912b54ad | 456 | |
fb69d709 | 457 | return resolve_remote(c); |
40976028 DS |
458 | } |
459 | ||
460 | static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
7b77ed8c | 461 | _cleanup_free_ char *peer = NULL; |
8569a776 LP |
462 | Context *context = userdata; |
463 | int nfd = -1, r; | |
40976028 | 464 | |
8569a776 LP |
465 | assert(s); |
466 | assert(fd >= 0); | |
40976028 | 467 | assert(revents & EPOLLIN); |
8569a776 LP |
468 | assert(context); |
469 | ||
470 | nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
7b77ed8c LP |
471 | if (nfd < 0) { |
472 | if (errno != -EAGAIN) | |
56f64d95 | 473 | log_warning_errno(errno, "Failed to accept() socket: %m"); |
7b77ed8c | 474 | } else { |
366b7db4 | 475 | getpeername_pretty(nfd, true, &peer); |
8569a776 | 476 | log_debug("New connection from %s", strna(peer)); |
40976028 | 477 | |
fb69d709 | 478 | r = add_connection_socket(context, nfd); |
f4bd42aa | 479 | if (r < 0) { |
da927ba9 | 480 | log_error_errno(r, "Failed to accept connection, ignoring: %m"); |
03e334a1 | 481 | safe_close(fd); |
f4bd42aa | 482 | } |
7b77ed8c | 483 | } |
8569a776 | 484 | |
40976028 DS |
485 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); |
486 | if (r < 0) { | |
da927ba9 | 487 | log_error_errno(r, "Error while re-enabling listener with ONESHOT: %m"); |
fb69d709 | 488 | sd_event_exit(context->event, r); |
40976028 DS |
489 | return r; |
490 | } | |
491 | ||
96c374d0 | 492 | return 1; |
912b54ad DS |
493 | } |
494 | ||
fb69d709 | 495 | static int add_listen_socket(Context *context, int fd) { |
8569a776 LP |
496 | sd_event_source *source; |
497 | int r; | |
498 | ||
499 | assert(context); | |
8569a776 | 500 | assert(fd >= 0); |
912b54ad | 501 | |
d5099efc | 502 | r = set_ensure_allocated(&context->listen, NULL); |
96c374d0 | 503 | if (r < 0) { |
8569a776 LP |
504 | log_oom(); |
505 | return r; | |
506 | } | |
507 | ||
508 | r = sd_is_socket(fd, 0, SOCK_STREAM, 1); | |
f647962d MS |
509 | if (r < 0) |
510 | return log_error_errno(r, "Failed to determine socket type: %m"); | |
8569a776 LP |
511 | if (r == 0) { |
512 | log_error("Passed in socket is not a stream socket."); | |
513 | return -EINVAL; | |
514 | } | |
912b54ad | 515 | |
8569a776 | 516 | r = fd_nonblock(fd, true); |
f647962d MS |
517 | if (r < 0) |
518 | return log_error_errno(r, "Failed to mark file descriptor non-blocking: %m"); | |
912b54ad | 519 | |
fb69d709 | 520 | r = sd_event_add_io(context->event, &source, fd, EPOLLIN, accept_cb, context); |
f647962d MS |
521 | if (r < 0) |
522 | return log_error_errno(r, "Failed to add event source: %m"); | |
912b54ad | 523 | |
8569a776 | 524 | r = set_put(context->listen, source); |
96c374d0 | 525 | if (r < 0) { |
da927ba9 | 526 | log_error_errno(r, "Failed to add source to set: %m"); |
8569a776 | 527 | sd_event_source_unref(source); |
40976028 DS |
528 | return r; |
529 | } | |
530 | ||
531 | /* Set the watcher to oneshot in case other processes are also | |
532 | * watching to accept(). */ | |
8569a776 | 533 | r = sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); |
f647962d MS |
534 | if (r < 0) |
535 | return log_error_errno(r, "Failed to enable oneshot mode: %m"); | |
912b54ad | 536 | |
8569a776 | 537 | return 0; |
912b54ad DS |
538 | } |
539 | ||
601185b4 ZJS |
540 | static void help(void) { |
541 | printf("%1$s [HOST:PORT]\n" | |
542 | "%1$s [SOCKET]\n\n" | |
8569a776 | 543 | "Bidirectionally proxy local sockets to another (possibly remote) socket.\n\n" |
23d0fff7 | 544 | " -c --connections-max= Set the maximum number of connections to be accepted\n" |
8cf030b3 LP |
545 | " -h --help Show this help\n" |
546 | " --version Show package version\n", | |
912b54ad | 547 | program_invocation_short_name); |
912b54ad DS |
548 | } |
549 | ||
8569a776 | 550 | static int parse_argv(int argc, char *argv[]) { |
912b54ad DS |
551 | |
552 | enum { | |
8cf030b3 LP |
553 | ARG_VERSION = 0x100, |
554 | ARG_IGNORE_ENV | |
912b54ad DS |
555 | }; |
556 | ||
557 | static const struct option options[] = { | |
dc3b8afb DK |
558 | { "connections-max", required_argument, NULL, 'c' }, |
559 | { "help", no_argument, NULL, 'h' }, | |
560 | { "version", no_argument, NULL, ARG_VERSION }, | |
eb9da376 | 561 | {} |
912b54ad DS |
562 | }; |
563 | ||
dc3b8afb | 564 | int c, r; |
912b54ad DS |
565 | |
566 | assert(argc >= 0); | |
567 | assert(argv); | |
568 | ||
dc3b8afb | 569 | while ((c = getopt_long(argc, argv, "c:h", options, NULL)) >= 0) |
912b54ad DS |
570 | |
571 | switch (c) { | |
572 | ||
573 | case 'h': | |
601185b4 ZJS |
574 | help(); |
575 | return 0; | |
912b54ad | 576 | |
dc3b8afb DK |
577 | case 'c': |
578 | r = safe_atou(optarg, &arg_connections_max); | |
579 | if (r < 0) { | |
580 | log_error("Failed to parse --connections-max= argument: %s", optarg); | |
581 | return r; | |
582 | } | |
583 | ||
584 | if (arg_connections_max < 1) { | |
585 | log_error("Connection limit is too low."); | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | break; | |
590 | ||
912b54ad | 591 | case ARG_VERSION: |
3f6fd1ba | 592 | return version(); |
912b54ad | 593 | |
eb9da376 | 594 | case '?': |
912b54ad | 595 | return -EINVAL; |
eb9da376 LP |
596 | |
597 | default: | |
598 | assert_not_reached("Unhandled option"); | |
912b54ad | 599 | } |
912b54ad | 600 | |
8569a776 LP |
601 | if (optind >= argc) { |
602 | log_error("Not enough parameters."); | |
912b54ad DS |
603 | return -EINVAL; |
604 | } | |
605 | ||
8569a776 LP |
606 | if (argc != optind+1) { |
607 | log_error("Too many parameters."); | |
912b54ad DS |
608 | return -EINVAL; |
609 | } | |
610 | ||
8569a776 | 611 | arg_remote_host = argv[optind]; |
912b54ad DS |
612 | return 1; |
613 | } | |
614 | ||
615 | int main(int argc, char *argv[]) { | |
8569a776 LP |
616 | Context context = {}; |
617 | int r, n, fd; | |
912b54ad DS |
618 | |
619 | log_parse_environment(); | |
620 | log_open(); | |
621 | ||
8569a776 | 622 | r = parse_argv(argc, argv); |
912b54ad DS |
623 | if (r <= 0) |
624 | goto finish; | |
625 | ||
fb69d709 | 626 | r = sd_event_default(&context.event); |
8569a776 | 627 | if (r < 0) { |
da927ba9 | 628 | log_error_errno(r, "Failed to allocate event loop: %m"); |
8569a776 LP |
629 | goto finish; |
630 | } | |
912b54ad | 631 | |
fb69d709 LP |
632 | r = sd_resolve_default(&context.resolve); |
633 | if (r < 0) { | |
da927ba9 | 634 | log_error_errno(r, "Failed to allocate resolver: %m"); |
fb69d709 LP |
635 | goto finish; |
636 | } | |
637 | ||
638 | r = sd_resolve_attach_event(context.resolve, context.event, 0); | |
639 | if (r < 0) { | |
da927ba9 | 640 | log_error_errno(r, "Failed to attach resolver: %m"); |
fb69d709 LP |
641 | goto finish; |
642 | } | |
643 | ||
644 | sd_event_set_watchdog(context.event, true); | |
cde93897 | 645 | |
8cf030b3 LP |
646 | n = sd_listen_fds(1); |
647 | if (n < 0) { | |
648 | log_error("Failed to receive sockets from parent."); | |
649 | r = n; | |
650 | goto finish; | |
651 | } else if (n == 0) { | |
652 | log_error("Didn't get any sockets passed in."); | |
653 | r = -EINVAL; | |
654 | goto finish; | |
655 | } | |
656 | ||
657 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
fb69d709 | 658 | r = add_listen_socket(&context, fd); |
8569a776 | 659 | if (r < 0) |
96c374d0 | 660 | goto finish; |
912b54ad DS |
661 | } |
662 | ||
fb69d709 | 663 | r = sd_event_loop(context.event); |
912b54ad | 664 | if (r < 0) { |
da927ba9 | 665 | log_error_errno(r, "Failed to run event loop: %m"); |
912b54ad DS |
666 | goto finish; |
667 | } | |
668 | ||
912b54ad | 669 | finish: |
8569a776 LP |
670 | context_free(&context); |
671 | ||
912b54ad DS |
672 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
673 | } |