Commit | Line | Data |
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c39c72ee PMF |
1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
d0b5f2b9 | 18 | #define _GNU_SOURCE |
f9e5ce61 PMF |
19 | #include <sys/types.h> |
20 | #include <signal.h> | |
21 | #include <errno.h> | |
22 | #include <sys/socket.h> | |
23 | #include <sys/un.h> | |
d0b5f2b9 | 24 | #include <unistd.h> |
aca1ad90 | 25 | #include <poll.h> |
803a4f58 | 26 | #include <sys/stat.h> |
f9e5ce61 PMF |
27 | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
d0b5f2b9 | 30 | #include <string.h> |
b0540e11 | 31 | #include <execinfo.h> |
d0b5f2b9 PMF |
32 | |
33 | #include "ustcomm.h" | |
6af64c43 | 34 | #include "usterr.h" |
2dae156b | 35 | #include "share.h" |
f9e5ce61 PMF |
36 | |
37 | #define UNIX_PATH_MAX 108 | |
f9e5ce61 | 38 | |
058a68cb | 39 | #define MSG_MAX 10000 |
d0b5f2b9 | 40 | |
aca1ad90 PMF |
41 | /* FIXME: ustcomm blocks on message sending, which might be problematic in |
42 | * some cases. Fix the poll() usage so sends are buffered until they don't | |
43 | * block. | |
44 | */ | |
45 | ||
3847c3ba PMF |
46 | //static void bt(void) |
47 | //{ | |
48 | // void *buffer[100]; | |
49 | // int result; | |
50 | // | |
51 | // result = backtrace(&buffer, 100); | |
52 | // backtrace_symbols_fd(buffer, result, STDERR_FILENO); | |
53 | //} | |
b0540e11 | 54 | |
d6d27063 PMF |
55 | static int mkdir_p(const char *path, mode_t mode) |
56 | { | |
c555b133 | 57 | const char *path_p; |
d6d27063 PMF |
58 | char *tmp; |
59 | ||
60 | int retval = 0; | |
61 | int result; | |
62 | ||
63 | tmp = malloc(strlen(path) + 1); | |
64 | if (tmp == NULL) | |
65 | return -1; | |
66 | ||
67 | /* skip first / */ | |
68 | path_p = path+1; | |
69 | ||
70 | for(;;) { | |
71 | while (*path_p != '/') { | |
72 | if(*path_p == 0) | |
73 | break; | |
74 | ++path_p; | |
75 | } | |
76 | if (*path_p == '/') { | |
77 | strncpy(tmp, path, path_p - path); | |
78 | tmp[path_p-path] = '\0'; | |
79 | if (tmp[path_p - path - 1] != '/') { | |
80 | result = mkdir(tmp, mode); | |
81 | if(result == -1) { | |
82 | if (!(errno == EEXIST || errno == EACCES || errno == EROFS)) { | |
83 | /* Then this is a real error */ | |
84 | retval = -1; | |
85 | break; | |
86 | } | |
87 | } | |
88 | } | |
89 | /* pass / */ | |
90 | path_p++; | |
91 | } else { | |
92 | /* last component */ | |
93 | result = mkdir(path, mode); | |
94 | if (result == -1) | |
95 | retval = -1; | |
96 | break; | |
97 | } | |
98 | } | |
99 | ||
100 | free(tmp); | |
101 | return retval; | |
102 | } | |
103 | ||
688760ef PMF |
104 | char *strdup_malloc(const char *s) |
105 | { | |
106 | char *retval; | |
107 | ||
108 | if(s == NULL) | |
109 | return NULL; | |
110 | ||
111 | retval = (char *) malloc(strlen(s)+1); | |
112 | ||
113 | strcpy(retval, s); | |
114 | ||
115 | return retval; | |
116 | } | |
117 | ||
52c51a47 | 118 | static int signal_process(pid_t pid) |
f9e5ce61 | 119 | { |
52c51a47 | 120 | return 0; |
f9e5ce61 PMF |
121 | } |
122 | ||
5932431b PMF |
123 | void ustcomm_init_connection(struct ustcomm_connection *conn) |
124 | { | |
125 | conn->recv_buf = NULL; | |
126 | conn->recv_buf_size = 0; | |
127 | conn->recv_buf_alloc = 0; | |
128 | } | |
129 | ||
ab33e65c | 130 | int pid_is_online(pid_t pid) { |
2944a629 | 131 | return 1; |
ab33e65c PP |
132 | } |
133 | ||
2dae156b PMF |
134 | /* Send a message |
135 | * | |
136 | * @fd: file descriptor to send to | |
137 | * @msg: a null-terminated string containing the message to send | |
138 | * | |
139 | * Return value: | |
140 | * -1: error | |
141 | * 0: connection closed | |
142 | * 1: success | |
143 | */ | |
144 | ||
4e2a8808 | 145 | static int send_message_fd(int fd, const char *msg) |
811e4b93 PMF |
146 | { |
147 | int result; | |
148 | ||
2dae156b PMF |
149 | /* Send including the final \0 */ |
150 | result = patient_send(fd, msg, strlen(msg)+1, MSG_NOSIGNAL); | |
811e4b93 | 151 | if(result == -1) { |
2dae156b PMF |
152 | if(errno != EPIPE) |
153 | PERROR("send"); | |
811e4b93 PMF |
154 | return -1; |
155 | } | |
688760ef PMF |
156 | else if(result == 0) { |
157 | return 0; | |
158 | } | |
811e4b93 | 159 | |
2dae156b | 160 | DBG("sent message \"%s\"", msg); |
688760ef | 161 | return 1; |
811e4b93 PMF |
162 | } |
163 | ||
b0540e11 PMF |
164 | /* Called by an app to ask the consumer daemon to connect to it. */ |
165 | ||
166 | int ustcomm_request_consumer(pid_t pid, const char *channel) | |
167 | { | |
168 | char path[UNIX_PATH_MAX]; | |
169 | int result; | |
08230db7 PMF |
170 | char *msg=NULL; |
171 | int retval = 0; | |
172 | struct ustcomm_connection conn; | |
c97d4437 PMF |
173 | char *explicit_daemon_socket_path; |
174 | ||
175 | explicit_daemon_socket_path = getenv("UST_DAEMON_SOCKET"); | |
176 | if(explicit_daemon_socket_path) { | |
177 | /* user specified explicitly a socket path */ | |
178 | result = snprintf(path, UNIX_PATH_MAX, "%s", explicit_daemon_socket_path); | |
179 | } | |
180 | else { | |
181 | /* just use the default path */ | |
182 | result = snprintf(path, UNIX_PATH_MAX, "%s/ustd", SOCK_DIR); | |
183 | } | |
b0540e11 | 184 | |
b0540e11 | 185 | if(result >= UNIX_PATH_MAX) { |
08230db7 | 186 | ERR("string overflow allocating socket name"); |
b0540e11 PMF |
187 | return -1; |
188 | } | |
189 | ||
190 | asprintf(&msg, "collect %d %s", pid, channel); | |
191 | ||
08230db7 PMF |
192 | /* don't signal it because it's the daemon */ |
193 | result = ustcomm_connect_path(path, &conn, -1); | |
194 | if(result == -1) { | |
195 | WARN("ustcomm_connect_path failed"); | |
196 | retval = -1; | |
197 | goto del_string; | |
198 | } | |
199 | ||
200 | result = ustcomm_send_request(&conn, msg, NULL); | |
201 | if(result == -1) { | |
202 | WARN("ustcomm_send_request failed"); | |
203 | retval = -1; | |
204 | goto disconnect; | |
205 | } | |
206 | ||
207 | disconnect: | |
208 | ustcomm_disconnect(&conn); | |
209 | del_string: | |
b0540e11 PMF |
210 | free(msg); |
211 | ||
08230db7 | 212 | return retval; |
b0540e11 PMF |
213 | } |
214 | ||
688760ef | 215 | /* returns 1 to indicate a message was received |
da000ba4 | 216 | * returns 0 to indicate no message was received (end of stream) |
688760ef PMF |
217 | * returns -1 to indicate an error |
218 | */ | |
811e4b93 | 219 | |
5932431b | 220 | #define RECV_INCREMENT 1000 |
da000ba4 | 221 | #define RECV_INITIAL_BUF_SIZE 10 |
2dae156b | 222 | |
5932431b | 223 | static int recv_message_fd(int fd, char **recv_buf, int *recv_buf_size, int *recv_buf_alloc, char **msg) |
d0b5f2b9 | 224 | { |
d0b5f2b9 | 225 | int result; |
d0b5f2b9 | 226 | |
5932431b PMF |
227 | /* 1. Check if there is a message in the buf */ |
228 | /* 2. If not, do: | |
229 | 2.1 receive chunk and put it in buffer | |
230 | 2.2 process full message if there is one | |
231 | -- while no message arrived | |
232 | */ | |
b02e31e5 | 233 | |
2dae156b | 234 | for(;;) { |
5932431b PMF |
235 | int i; |
236 | int nulfound = 0; | |
237 | ||
238 | /* Search for full message in buffer */ | |
239 | for(i=0; i<*recv_buf_size; i++) { | |
240 | if((*recv_buf)[i] == '\0') { | |
241 | nulfound = 1; | |
242 | break; | |
da000ba4 | 243 | } |
2dae156b | 244 | } |
b0540e11 | 245 | |
5932431b PMF |
246 | /* Process found message */ |
247 | if(nulfound == 1) { | |
248 | char *newbuf; | |
249 | ||
250 | if(i == 0) { | |
251 | /* problem */ | |
252 | } | |
253 | *msg = strndup(*recv_buf, i); | |
254 | ||
255 | /* Remove processed message from buffer */ | |
256 | newbuf = (char *) malloc(*recv_buf_size - (i+1)); | |
257 | memcpy(newbuf, *recv_buf + (i+1), *recv_buf_size - (i+1)); | |
258 | free(*recv_buf); | |
259 | *recv_buf = newbuf; | |
260 | *recv_buf_size -= (i+1); | |
261 | *recv_buf_alloc -= (i+1); | |
262 | ||
263 | return 1; | |
264 | } | |
265 | ||
266 | /* Receive a chunk from the fd */ | |
267 | if(*recv_buf_alloc - *recv_buf_size < RECV_INCREMENT) { | |
268 | *recv_buf_alloc += RECV_INCREMENT - (*recv_buf_alloc - *recv_buf_size); | |
269 | *recv_buf = (char *) realloc(*recv_buf, *recv_buf_alloc); | |
270 | } | |
271 | ||
272 | result = recv(fd, *recv_buf+*recv_buf_size, RECV_INCREMENT, 0); | |
2dae156b | 273 | if(result == -1) { |
5932431b PMF |
274 | if(errno == ECONNRESET) { |
275 | *recv_buf_size = 0; | |
276 | return 0; | |
277 | } | |
278 | /* real error */ | |
279 | PERROR("recv"); | |
2dae156b PMF |
280 | return -1; |
281 | } | |
282 | if(result == 0) { | |
5932431b | 283 | return 0; |
2dae156b | 284 | } |
5932431b | 285 | *recv_buf_size += result; |
2dae156b | 286 | |
5932431b | 287 | /* Go back to the beginning to check if there is a full message in the buffer */ |
2dae156b | 288 | } |
b0540e11 | 289 | |
5932431b | 290 | DBG("received message \"%s\"", *recv_buf); |
811e4b93 | 291 | |
688760ef | 292 | return 1; |
2dae156b | 293 | |
d0b5f2b9 PMF |
294 | } |
295 | ||
5932431b PMF |
296 | static int recv_message_conn(struct ustcomm_connection *conn, char **msg) |
297 | { | |
298 | return recv_message_fd(conn->fd, &conn->recv_buf, &conn->recv_buf_size, &conn->recv_buf_alloc, msg); | |
299 | } | |
300 | ||
811e4b93 PMF |
301 | int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src) |
302 | { | |
303 | int result; | |
304 | ||
4e2a8808 | 305 | result = send_message_fd(src->fd, msg); |
3a7b90de | 306 | if(result < 0) { |
811e4b93 PMF |
307 | ERR("error in send_message_fd"); |
308 | return -1; | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
99b72dc0 PMF |
314 | /* Called after a fork. */ |
315 | ||
316 | int ustcomm_close_all_connections(struct ustcomm_server *server) | |
317 | { | |
318 | struct ustcomm_connection *conn; | |
319 | struct ustcomm_connection *deletable_conn = NULL; | |
320 | ||
321 | list_for_each_entry(conn, &server->connections, list) { | |
322 | free(deletable_conn); | |
323 | deletable_conn = conn; | |
324 | close(conn->fd); | |
325 | list_del(&conn->list); | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
688760ef PMF |
331 | /* @timeout: max blocking time in milliseconds, -1 means infinity |
332 | * | |
333 | * returns 1 to indicate a message was received | |
334 | * returns 0 to indicate no message was received | |
335 | * returns -1 to indicate an error | |
336 | */ | |
337 | ||
338 | int ustcomm_recv_message(struct ustcomm_server *server, char **msg, struct ustcomm_source *src, int timeout) | |
b0540e11 | 339 | { |
aca1ad90 | 340 | struct pollfd *fds; |
5932431b | 341 | struct ustcomm_connection **conn_table; |
aca1ad90 PMF |
342 | struct ustcomm_connection *conn; |
343 | int result; | |
344 | int retval; | |
345 | ||
346 | for(;;) { | |
347 | int idx = 0; | |
348 | int n_fds = 1; | |
349 | ||
811e4b93 | 350 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
351 | n_fds++; |
352 | } | |
353 | ||
354 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
355 | if(fds == NULL) { | |
356 | ERR("malloc returned NULL"); | |
357 | return -1; | |
358 | } | |
359 | ||
5932431b PMF |
360 | conn_table = (struct ustcomm_connection **) malloc(n_fds * sizeof(struct ustcomm_connection *)); |
361 | if(conn_table == NULL) { | |
362 | ERR("malloc returned NULL"); | |
363 | return -1; | |
364 | } | |
365 | ||
aca1ad90 | 366 | /* special idx 0 is for listening socket */ |
811e4b93 | 367 | fds[idx].fd = server->listen_fd; |
aca1ad90 PMF |
368 | fds[idx].events = POLLIN; |
369 | idx++; | |
370 | ||
811e4b93 | 371 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
372 | fds[idx].fd = conn->fd; |
373 | fds[idx].events = POLLIN; | |
5932431b | 374 | conn_table[idx] = conn; |
aca1ad90 PMF |
375 | idx++; |
376 | } | |
377 | ||
69ba0156 PMF |
378 | while((result = poll(fds, n_fds, timeout)) == -1 && errno == EINTR) |
379 | /* nothing */; | |
aca1ad90 PMF |
380 | if(result == -1) { |
381 | PERROR("poll"); | |
382 | return -1; | |
383 | } | |
384 | ||
688760ef PMF |
385 | if(result == 0) |
386 | return 0; | |
387 | ||
aca1ad90 PMF |
388 | if(fds[0].revents) { |
389 | struct ustcomm_connection *newconn; | |
390 | int newfd; | |
391 | ||
811e4b93 | 392 | result = newfd = accept(server->listen_fd, NULL, NULL); |
aca1ad90 PMF |
393 | if(result == -1) { |
394 | PERROR("accept"); | |
395 | return -1; | |
396 | } | |
397 | ||
398 | newconn = (struct ustcomm_connection *) malloc(sizeof(struct ustcomm_connection)); | |
399 | if(newconn == NULL) { | |
400 | ERR("malloc returned NULL"); | |
401 | return -1; | |
402 | } | |
403 | ||
5932431b | 404 | ustcomm_init_connection(newconn); |
aca1ad90 PMF |
405 | newconn->fd = newfd; |
406 | ||
811e4b93 | 407 | list_add(&newconn->list, &server->connections); |
aca1ad90 PMF |
408 | } |
409 | ||
410 | for(idx=1; idx<n_fds; idx++) { | |
411 | if(fds[idx].revents) { | |
5932431b | 412 | retval = recv_message_conn(conn_table[idx], msg); |
2dae156b PMF |
413 | if(src) |
414 | src->fd = fds[idx].fd; | |
415 | ||
e2b815a9 | 416 | if(retval == 0) { |
aca1ad90 PMF |
417 | /* connection finished */ |
418 | close(fds[idx].fd); | |
419 | ||
811e4b93 | 420 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
421 | if(conn->fd == fds[idx].fd) { |
422 | list_del(&conn->list); | |
423 | break; | |
424 | } | |
425 | } | |
426 | } | |
427 | else { | |
428 | goto free_fds_return; | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
433 | free(fds); | |
434 | } | |
435 | ||
436 | free_fds_return: | |
437 | free(fds); | |
438 | return retval; | |
b0540e11 PMF |
439 | } |
440 | ||
688760ef | 441 | int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout) |
811e4b93 | 442 | { |
688760ef | 443 | return ustcomm_recv_message(&ustd->server, msg, src, timeout); |
811e4b93 PMF |
444 | } |
445 | ||
688760ef | 446 | int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout) |
b0540e11 | 447 | { |
688760ef | 448 | return ustcomm_recv_message(&app->server, msg, src, timeout); |
b0540e11 PMF |
449 | } |
450 | ||
46ef48cd PMF |
451 | /* This removes src from the list of active connections of app. |
452 | */ | |
453 | ||
454 | int ustcomm_app_detach_client(struct ustcomm_app *app, struct ustcomm_source *src) | |
455 | { | |
456 | struct ustcomm_server *server = (struct ustcomm_server *)app; | |
457 | struct ustcomm_connection *conn; | |
458 | ||
459 | list_for_each_entry(conn, &server->connections, list) { | |
460 | if(conn->fd == src->fd) { | |
461 | list_del(&conn->list); | |
462 | goto found; | |
463 | } | |
464 | } | |
465 | ||
466 | return -1; | |
467 | found: | |
468 | return src->fd; | |
469 | } | |
470 | ||
08230db7 | 471 | static int init_named_socket(const char *name, char **path_out) |
d0b5f2b9 PMF |
472 | { |
473 | int result; | |
474 | int fd; | |
475 | ||
476 | struct sockaddr_un addr; | |
477 | ||
aca1ad90 | 478 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
d0b5f2b9 PMF |
479 | if(result == -1) { |
480 | PERROR("socket"); | |
481 | return -1; | |
482 | } | |
483 | ||
484 | addr.sun_family = AF_UNIX; | |
485 | ||
486 | strncpy(addr.sun_path, name, UNIX_PATH_MAX); | |
487 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; | |
488 | ||
aca1ad90 PMF |
489 | result = access(name, F_OK); |
490 | if(result == 0) { | |
491 | /* file exists */ | |
492 | result = unlink(name); | |
493 | if(result == -1) { | |
494 | PERROR("unlink of socket file"); | |
495 | goto close_sock; | |
496 | } | |
497 | WARN("socket already exists; overwriting"); | |
498 | } | |
499 | ||
d0b5f2b9 PMF |
500 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
501 | if(result == -1) { | |
502 | PERROR("bind"); | |
503 | goto close_sock; | |
504 | } | |
505 | ||
aca1ad90 PMF |
506 | result = listen(fd, 1); |
507 | if(result == -1) { | |
508 | PERROR("listen"); | |
509 | goto close_sock; | |
510 | } | |
511 | ||
b0540e11 | 512 | if(path_out) { |
803a4f58 | 513 | *path_out = strdup(addr.sun_path); |
b0540e11 | 514 | } |
d0b5f2b9 PMF |
515 | |
516 | return fd; | |
517 | ||
518 | close_sock: | |
519 | close(fd); | |
520 | ||
521 | return -1; | |
522 | } | |
523 | ||
34b460e6 PMF |
524 | /* |
525 | * Return value: | |
526 | * 0: Success, but no reply because recv() returned 0 | |
527 | * 1: Success | |
528 | * -1: Error | |
529 | * | |
530 | * On error, the error message is printed, except on | |
531 | * ECONNRESET, which is normal when the application dies. | |
532 | */ | |
533 | ||
772030fe | 534 | int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply) |
4e2a8808 PMF |
535 | { |
536 | int result; | |
537 | ||
2dae156b PMF |
538 | /* Send including the final \0 */ |
539 | result = send_message_fd(conn->fd, req); | |
540 | if(result != 1) | |
541 | return result; | |
4e2a8808 PMF |
542 | |
543 | if(!reply) | |
544 | return 1; | |
545 | ||
5932431b | 546 | result = recv_message_conn(conn, reply); |
4e2a8808 | 547 | if(result == -1) { |
4e2a8808 PMF |
548 | return -1; |
549 | } | |
550 | else if(result == 0) { | |
551 | return 0; | |
552 | } | |
553 | ||
4e2a8808 PMF |
554 | return 1; |
555 | } | |
556 | ||
08230db7 | 557 | int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid) |
4e2a8808 PMF |
558 | { |
559 | int fd; | |
560 | int result; | |
561 | struct sockaddr_un addr; | |
562 | ||
5932431b PMF |
563 | ustcomm_init_connection(conn); |
564 | ||
4e2a8808 PMF |
565 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
566 | if(result == -1) { | |
567 | PERROR("socket"); | |
568 | return -1; | |
569 | } | |
570 | ||
571 | addr.sun_family = AF_UNIX; | |
572 | ||
573 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
574 | if(result >= UNIX_PATH_MAX) { | |
575 | ERR("string overflow allocating socket name"); | |
576 | return -1; | |
577 | } | |
578 | ||
52c51a47 PMF |
579 | if(signalpid >= 0) { |
580 | result = signal_process(signalpid); | |
581 | if(result == -1) { | |
582 | ERR("could not signal process"); | |
583 | return -1; | |
584 | } | |
585 | } | |
4e2a8808 PMF |
586 | |
587 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
588 | if(result == -1) { | |
2dae156b | 589 | PERROR("connect (path=%s)", path); |
4e2a8808 PMF |
590 | return -1; |
591 | } | |
592 | ||
593 | conn->fd = fd; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | int ustcomm_disconnect(struct ustcomm_connection *conn) | |
599 | { | |
600 | return close(conn->fd); | |
601 | } | |
602 | ||
603 | int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn) | |
604 | { | |
605 | int result; | |
606 | char path[UNIX_PATH_MAX]; | |
607 | ||
608 | ||
609 | result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid); | |
610 | if(result >= UNIX_PATH_MAX) { | |
08230db7 | 611 | ERR("string overflow allocating socket name"); |
4e2a8808 PMF |
612 | return -1; |
613 | } | |
614 | ||
615 | return ustcomm_connect_path(path, conn, pid); | |
616 | } | |
617 | ||
dce0b474 PMF |
618 | static int ensure_dir_exists(const char *dir) |
619 | { | |
620 | struct stat st; | |
621 | int result; | |
622 | ||
623 | if(!strcmp(dir, "")) | |
624 | return -1; | |
625 | ||
626 | result = stat(dir, &st); | |
627 | if(result == -1 && errno != ENOENT) { | |
628 | return -1; | |
629 | } | |
630 | else if(result == -1) { | |
631 | /* ENOENT */ | |
dce0b474 PMF |
632 | int result; |
633 | ||
d6d27063 | 634 | result = mkdir_p(dir, 0777); |
dce0b474 | 635 | if(result != 0) { |
d6d27063 | 636 | ERR("executing in recursive creation of directory %s", dir); |
dce0b474 PMF |
637 | return -1; |
638 | } | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
08230db7 PMF |
644 | /* Called by an application to initialize its server so daemons can |
645 | * connect to it. | |
646 | */ | |
4e2a8808 | 647 | |
d0b5f2b9 PMF |
648 | int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle) |
649 | { | |
650 | int result; | |
651 | char *name; | |
652 | ||
653 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid); | |
654 | if(result >= UNIX_PATH_MAX) { | |
655 | ERR("string overflow allocating socket name"); | |
656 | return -1; | |
657 | } | |
658 | ||
dce0b474 PMF |
659 | result = ensure_dir_exists(SOCK_DIR); |
660 | if(result == -1) { | |
661 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
662 | return -1; | |
663 | } | |
664 | ||
811e4b93 PMF |
665 | handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath)); |
666 | if(handle->server.listen_fd < 0) { | |
68ab7a5d | 667 | ERR("Error initializing named socket (%s). Check that directory exists and that it is writable.", name); |
d0b5f2b9 PMF |
668 | goto free_name; |
669 | } | |
670 | free(name); | |
671 | ||
811e4b93 | 672 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 673 | |
d0b5f2b9 PMF |
674 | return 0; |
675 | ||
676 | free_name: | |
677 | free(name); | |
678 | return -1; | |
679 | } | |
680 | ||
393bc391 PMF |
681 | void ustcomm_free_app(struct ustcomm_app *app) |
682 | { | |
683 | int result; | |
684 | result = close(app->server.listen_fd); | |
685 | if(result == -1) { | |
686 | PERROR("close"); | |
687 | return; | |
688 | } | |
689 | } | |
690 | ||
08230db7 PMF |
691 | /* Used by the daemon to initialize its server so applications |
692 | * can connect to it. | |
693 | */ | |
694 | ||
c97d4437 | 695 | int ustcomm_init_ustd(struct ustcomm_ustd *handle, const char *sock_path) |
d0b5f2b9 | 696 | { |
3847c3ba | 697 | char *name; |
c97d4437 | 698 | int retval = 0; |
3847c3ba | 699 | |
c97d4437 PMF |
700 | if(sock_path) { |
701 | asprintf(&name, "%s", sock_path); | |
702 | } | |
703 | else { | |
dce0b474 PMF |
704 | int result; |
705 | ||
706 | /* Only check if socket dir exists if we are using the default directory */ | |
707 | result = ensure_dir_exists(SOCK_DIR); | |
708 | if(result == -1) { | |
709 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
710 | return -1; | |
711 | } | |
712 | ||
c97d4437 | 713 | asprintf(&name, "%s/%s", SOCK_DIR, "ustd"); |
3847c3ba PMF |
714 | } |
715 | ||
811e4b93 PMF |
716 | handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath); |
717 | if(handle->server.listen_fd < 0) { | |
6cb88bc0 | 718 | ERR("error initializing named socket at %s", name); |
c97d4437 | 719 | retval = -1; |
aca1ad90 PMF |
720 | goto free_name; |
721 | } | |
d0b5f2b9 | 722 | |
811e4b93 | 723 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 724 | |
aca1ad90 PMF |
725 | free_name: |
726 | free(name); | |
c97d4437 PMF |
727 | |
728 | return retval; | |
d0b5f2b9 | 729 | } |
b02e31e5 | 730 | |
803a4f58 PMF |
731 | void ustcomm_fini_app(struct ustcomm_app *handle) |
732 | { | |
733 | int result; | |
734 | struct stat st; | |
735 | ||
736 | /* Destroy socket */ | |
803a4f58 PMF |
737 | result = stat(handle->server.socketpath, &st); |
738 | if(result == -1) { | |
739 | PERROR("stat (%s)", handle->server.socketpath); | |
740 | return; | |
741 | } | |
742 | ||
743 | /* Paranoid check before deleting. */ | |
744 | result = S_ISSOCK(st.st_mode); | |
745 | if(!result) { | |
746 | ERR("The socket we are about to delete is not a socket."); | |
747 | return; | |
748 | } | |
749 | ||
750 | result = unlink(handle->server.socketpath); | |
751 | if(result == -1) { | |
752 | PERROR("unlink"); | |
753 | } | |
754 | } | |
755 | ||
7e92827d | 756 | static const char *find_tok(const char *str) |
b02e31e5 PMF |
757 | { |
758 | while(*str == ' ') { | |
759 | str++; | |
760 | ||
761 | if(*str == 0) | |
762 | return NULL; | |
763 | } | |
764 | ||
765 | return str; | |
766 | } | |
767 | ||
7e92827d | 768 | static const char *find_sep(const char *str) |
b02e31e5 PMF |
769 | { |
770 | while(*str != ' ') { | |
771 | str++; | |
772 | ||
773 | if(*str == 0) | |
774 | break; | |
775 | } | |
776 | ||
777 | return str; | |
778 | } | |
779 | ||
7e92827d | 780 | int nth_token_is(const char *str, const char *token, int tok_no) |
b02e31e5 PMF |
781 | { |
782 | int i; | |
7e92827d PMF |
783 | const char *start; |
784 | const char *end; | |
b02e31e5 PMF |
785 | |
786 | for(i=0; i<=tok_no; i++) { | |
787 | str = find_tok(str); | |
788 | if(str == NULL) | |
789 | return -1; | |
790 | ||
791 | start = str; | |
792 | ||
793 | str = find_sep(str); | |
794 | if(str == NULL) | |
795 | return -1; | |
796 | ||
797 | end = str; | |
798 | } | |
799 | ||
800 | if(end-start != strlen(token)) | |
801 | return 0; | |
802 | ||
803 | if(strncmp(start, token, end-start)) | |
804 | return 0; | |
805 | ||
806 | return 1; | |
807 | } | |
808 | ||
7e92827d | 809 | char *nth_token(const char *str, int tok_no) |
b02e31e5 PMF |
810 | { |
811 | static char *retval = NULL; | |
812 | int i; | |
7e92827d PMF |
813 | const char *start; |
814 | const char *end; | |
b02e31e5 PMF |
815 | |
816 | for(i=0; i<=tok_no; i++) { | |
817 | str = find_tok(str); | |
818 | if(str == NULL) | |
819 | return NULL; | |
820 | ||
821 | start = str; | |
822 | ||
823 | str = find_sep(str); | |
824 | if(str == NULL) | |
825 | return NULL; | |
826 | ||
827 | end = str; | |
828 | } | |
829 | ||
830 | if(retval) { | |
831 | free(retval); | |
832 | retval = NULL; | |
833 | } | |
834 | ||
aca1ad90 | 835 | asprintf(&retval, "%.*s", (int)(end-start), start); |
b02e31e5 PMF |
836 | |
837 | return retval; | |
838 | } | |
839 |