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 */ | |
2a79ceeb | 252 | WARN("received empty message"); |
5932431b PMF |
253 | } |
254 | *msg = strndup(*recv_buf, i); | |
255 | ||
256 | /* Remove processed message from buffer */ | |
257 | newbuf = (char *) malloc(*recv_buf_size - (i+1)); | |
258 | memcpy(newbuf, *recv_buf + (i+1), *recv_buf_size - (i+1)); | |
259 | free(*recv_buf); | |
260 | *recv_buf = newbuf; | |
261 | *recv_buf_size -= (i+1); | |
262 | *recv_buf_alloc -= (i+1); | |
263 | ||
264 | return 1; | |
265 | } | |
266 | ||
267 | /* Receive a chunk from the fd */ | |
268 | if(*recv_buf_alloc - *recv_buf_size < RECV_INCREMENT) { | |
269 | *recv_buf_alloc += RECV_INCREMENT - (*recv_buf_alloc - *recv_buf_size); | |
270 | *recv_buf = (char *) realloc(*recv_buf, *recv_buf_alloc); | |
271 | } | |
272 | ||
273 | result = recv(fd, *recv_buf+*recv_buf_size, RECV_INCREMENT, 0); | |
2dae156b | 274 | if(result == -1) { |
5932431b PMF |
275 | if(errno == ECONNRESET) { |
276 | *recv_buf_size = 0; | |
277 | return 0; | |
278 | } | |
279 | /* real error */ | |
280 | PERROR("recv"); | |
2dae156b PMF |
281 | return -1; |
282 | } | |
283 | if(result == 0) { | |
5932431b | 284 | return 0; |
2dae156b | 285 | } |
5932431b | 286 | *recv_buf_size += result; |
2dae156b | 287 | |
5932431b | 288 | /* Go back to the beginning to check if there is a full message in the buffer */ |
2dae156b | 289 | } |
b0540e11 | 290 | |
5932431b | 291 | DBG("received message \"%s\"", *recv_buf); |
811e4b93 | 292 | |
688760ef | 293 | return 1; |
2dae156b | 294 | |
d0b5f2b9 PMF |
295 | } |
296 | ||
5932431b PMF |
297 | static int recv_message_conn(struct ustcomm_connection *conn, char **msg) |
298 | { | |
299 | return recv_message_fd(conn->fd, &conn->recv_buf, &conn->recv_buf_size, &conn->recv_buf_alloc, msg); | |
300 | } | |
301 | ||
811e4b93 PMF |
302 | int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src) |
303 | { | |
304 | int result; | |
305 | ||
4e2a8808 | 306 | result = send_message_fd(src->fd, msg); |
3a7b90de | 307 | if(result < 0) { |
811e4b93 PMF |
308 | ERR("error in send_message_fd"); |
309 | return -1; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
99b72dc0 PMF |
315 | /* Called after a fork. */ |
316 | ||
317 | int ustcomm_close_all_connections(struct ustcomm_server *server) | |
318 | { | |
319 | struct ustcomm_connection *conn; | |
320 | struct ustcomm_connection *deletable_conn = NULL; | |
321 | ||
322 | list_for_each_entry(conn, &server->connections, list) { | |
323 | free(deletable_conn); | |
324 | deletable_conn = conn; | |
2a79ceeb | 325 | ustcomm_close_app(conn); |
99b72dc0 PMF |
326 | list_del(&conn->list); |
327 | } | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
688760ef PMF |
332 | /* @timeout: max blocking time in milliseconds, -1 means infinity |
333 | * | |
334 | * returns 1 to indicate a message was received | |
335 | * returns 0 to indicate no message was received | |
336 | * returns -1 to indicate an error | |
337 | */ | |
338 | ||
339 | int ustcomm_recv_message(struct ustcomm_server *server, char **msg, struct ustcomm_source *src, int timeout) | |
b0540e11 | 340 | { |
aca1ad90 | 341 | struct pollfd *fds; |
5932431b | 342 | struct ustcomm_connection **conn_table; |
aca1ad90 PMF |
343 | struct ustcomm_connection *conn; |
344 | int result; | |
345 | int retval; | |
346 | ||
347 | for(;;) { | |
348 | int idx = 0; | |
349 | int n_fds = 1; | |
350 | ||
811e4b93 | 351 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
352 | n_fds++; |
353 | } | |
354 | ||
355 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
356 | if(fds == NULL) { | |
357 | ERR("malloc returned NULL"); | |
358 | return -1; | |
359 | } | |
360 | ||
5932431b PMF |
361 | conn_table = (struct ustcomm_connection **) malloc(n_fds * sizeof(struct ustcomm_connection *)); |
362 | if(conn_table == NULL) { | |
363 | ERR("malloc returned NULL"); | |
2a79ceeb PMF |
364 | retval = -1; |
365 | goto free_fds_return; | |
5932431b PMF |
366 | } |
367 | ||
aca1ad90 | 368 | /* special idx 0 is for listening socket */ |
811e4b93 | 369 | fds[idx].fd = server->listen_fd; |
aca1ad90 PMF |
370 | fds[idx].events = POLLIN; |
371 | idx++; | |
372 | ||
811e4b93 | 373 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
374 | fds[idx].fd = conn->fd; |
375 | fds[idx].events = POLLIN; | |
5932431b | 376 | conn_table[idx] = conn; |
aca1ad90 PMF |
377 | idx++; |
378 | } | |
379 | ||
69ba0156 PMF |
380 | while((result = poll(fds, n_fds, timeout)) == -1 && errno == EINTR) |
381 | /* nothing */; | |
aca1ad90 PMF |
382 | if(result == -1) { |
383 | PERROR("poll"); | |
2a79ceeb PMF |
384 | retval = -1; |
385 | goto free_conn_table_return; | |
aca1ad90 PMF |
386 | } |
387 | ||
2a79ceeb PMF |
388 | if(result == 0) { |
389 | retval = 0; | |
390 | goto free_conn_table_return; | |
391 | } | |
688760ef | 392 | |
aca1ad90 PMF |
393 | if(fds[0].revents) { |
394 | struct ustcomm_connection *newconn; | |
395 | int newfd; | |
396 | ||
811e4b93 | 397 | result = newfd = accept(server->listen_fd, NULL, NULL); |
aca1ad90 PMF |
398 | if(result == -1) { |
399 | PERROR("accept"); | |
2a79ceeb PMF |
400 | retval = -1; |
401 | goto free_conn_table_return; | |
aca1ad90 PMF |
402 | } |
403 | ||
404 | newconn = (struct ustcomm_connection *) malloc(sizeof(struct ustcomm_connection)); | |
405 | if(newconn == NULL) { | |
406 | ERR("malloc returned NULL"); | |
407 | return -1; | |
408 | } | |
409 | ||
5932431b | 410 | ustcomm_init_connection(newconn); |
aca1ad90 PMF |
411 | newconn->fd = newfd; |
412 | ||
811e4b93 | 413 | list_add(&newconn->list, &server->connections); |
aca1ad90 PMF |
414 | } |
415 | ||
416 | for(idx=1; idx<n_fds; idx++) { | |
417 | if(fds[idx].revents) { | |
5932431b | 418 | retval = recv_message_conn(conn_table[idx], msg); |
2dae156b PMF |
419 | if(src) |
420 | src->fd = fds[idx].fd; | |
421 | ||
e2b815a9 | 422 | if(retval == 0) { |
aca1ad90 | 423 | /* connection finished */ |
811e4b93 | 424 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 | 425 | if(conn->fd == fds[idx].fd) { |
750f9da4 | 426 | ustcomm_close_app(conn); |
aca1ad90 | 427 | list_del(&conn->list); |
750f9da4 | 428 | free(conn); |
aca1ad90 PMF |
429 | break; |
430 | } | |
431 | } | |
432 | } | |
433 | else { | |
2a79ceeb | 434 | goto free_conn_table_return; |
aca1ad90 PMF |
435 | } |
436 | } | |
437 | } | |
438 | ||
439 | free(fds); | |
2a79ceeb | 440 | free(conn_table); |
aca1ad90 PMF |
441 | } |
442 | ||
2a79ceeb PMF |
443 | free_conn_table_return: |
444 | free(conn_table); | |
aca1ad90 PMF |
445 | free_fds_return: |
446 | free(fds); | |
447 | return retval; | |
b0540e11 PMF |
448 | } |
449 | ||
688760ef | 450 | int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout) |
811e4b93 | 451 | { |
688760ef | 452 | return ustcomm_recv_message(&ustd->server, msg, src, timeout); |
811e4b93 PMF |
453 | } |
454 | ||
688760ef | 455 | int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout) |
b0540e11 | 456 | { |
688760ef | 457 | return ustcomm_recv_message(&app->server, msg, src, timeout); |
b0540e11 PMF |
458 | } |
459 | ||
46ef48cd PMF |
460 | /* This removes src from the list of active connections of app. |
461 | */ | |
462 | ||
463 | int ustcomm_app_detach_client(struct ustcomm_app *app, struct ustcomm_source *src) | |
464 | { | |
465 | struct ustcomm_server *server = (struct ustcomm_server *)app; | |
466 | struct ustcomm_connection *conn; | |
467 | ||
468 | list_for_each_entry(conn, &server->connections, list) { | |
469 | if(conn->fd == src->fd) { | |
470 | list_del(&conn->list); | |
471 | goto found; | |
472 | } | |
473 | } | |
474 | ||
475 | return -1; | |
476 | found: | |
477 | return src->fd; | |
478 | } | |
479 | ||
08230db7 | 480 | static int init_named_socket(const char *name, char **path_out) |
d0b5f2b9 PMF |
481 | { |
482 | int result; | |
483 | int fd; | |
484 | ||
485 | struct sockaddr_un addr; | |
486 | ||
aca1ad90 | 487 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
d0b5f2b9 PMF |
488 | if(result == -1) { |
489 | PERROR("socket"); | |
490 | return -1; | |
491 | } | |
492 | ||
493 | addr.sun_family = AF_UNIX; | |
494 | ||
495 | strncpy(addr.sun_path, name, UNIX_PATH_MAX); | |
496 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; | |
497 | ||
aca1ad90 PMF |
498 | result = access(name, F_OK); |
499 | if(result == 0) { | |
500 | /* file exists */ | |
501 | result = unlink(name); | |
502 | if(result == -1) { | |
503 | PERROR("unlink of socket file"); | |
504 | goto close_sock; | |
505 | } | |
69c37f74 | 506 | DBG("socket already exists; overwriting"); |
aca1ad90 PMF |
507 | } |
508 | ||
d0b5f2b9 PMF |
509 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
510 | if(result == -1) { | |
511 | PERROR("bind"); | |
512 | goto close_sock; | |
513 | } | |
514 | ||
aca1ad90 PMF |
515 | result = listen(fd, 1); |
516 | if(result == -1) { | |
517 | PERROR("listen"); | |
518 | goto close_sock; | |
519 | } | |
520 | ||
b0540e11 | 521 | if(path_out) { |
803a4f58 | 522 | *path_out = strdup(addr.sun_path); |
b0540e11 | 523 | } |
d0b5f2b9 PMF |
524 | |
525 | return fd; | |
526 | ||
527 | close_sock: | |
528 | close(fd); | |
529 | ||
530 | return -1; | |
531 | } | |
532 | ||
34b460e6 PMF |
533 | /* |
534 | * Return value: | |
535 | * 0: Success, but no reply because recv() returned 0 | |
536 | * 1: Success | |
537 | * -1: Error | |
538 | * | |
539 | * On error, the error message is printed, except on | |
540 | * ECONNRESET, which is normal when the application dies. | |
541 | */ | |
542 | ||
772030fe | 543 | int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply) |
4e2a8808 PMF |
544 | { |
545 | int result; | |
546 | ||
2dae156b PMF |
547 | /* Send including the final \0 */ |
548 | result = send_message_fd(conn->fd, req); | |
549 | if(result != 1) | |
550 | return result; | |
4e2a8808 PMF |
551 | |
552 | if(!reply) | |
553 | return 1; | |
554 | ||
5932431b | 555 | result = recv_message_conn(conn, reply); |
4e2a8808 | 556 | if(result == -1) { |
4e2a8808 PMF |
557 | return -1; |
558 | } | |
559 | else if(result == 0) { | |
560 | return 0; | |
561 | } | |
562 | ||
4e2a8808 PMF |
563 | return 1; |
564 | } | |
565 | ||
2a79ceeb PMF |
566 | /* Return value: |
567 | * 0: success | |
568 | * -1: error | |
569 | */ | |
570 | ||
08230db7 | 571 | int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid) |
4e2a8808 PMF |
572 | { |
573 | int fd; | |
574 | int result; | |
575 | struct sockaddr_un addr; | |
576 | ||
5932431b PMF |
577 | ustcomm_init_connection(conn); |
578 | ||
4e2a8808 PMF |
579 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
580 | if(result == -1) { | |
581 | PERROR("socket"); | |
582 | return -1; | |
583 | } | |
584 | ||
585 | addr.sun_family = AF_UNIX; | |
586 | ||
587 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
588 | if(result >= UNIX_PATH_MAX) { | |
589 | ERR("string overflow allocating socket name"); | |
590 | return -1; | |
591 | } | |
592 | ||
52c51a47 PMF |
593 | if(signalpid >= 0) { |
594 | result = signal_process(signalpid); | |
595 | if(result == -1) { | |
596 | ERR("could not signal process"); | |
597 | return -1; | |
598 | } | |
599 | } | |
4e2a8808 PMF |
600 | |
601 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
602 | if(result == -1) { | |
2dae156b | 603 | PERROR("connect (path=%s)", path); |
4e2a8808 PMF |
604 | return -1; |
605 | } | |
606 | ||
607 | conn->fd = fd; | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | int ustcomm_disconnect(struct ustcomm_connection *conn) | |
613 | { | |
614 | return close(conn->fd); | |
615 | } | |
616 | ||
2a79ceeb PMF |
617 | /* Open a connection to a traceable app. |
618 | * | |
619 | * Return value: | |
620 | * 0: success | |
621 | * -1: error | |
622 | */ | |
623 | ||
4e2a8808 PMF |
624 | int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn) |
625 | { | |
626 | int result; | |
627 | char path[UNIX_PATH_MAX]; | |
628 | ||
629 | ||
630 | result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid); | |
631 | if(result >= UNIX_PATH_MAX) { | |
08230db7 | 632 | ERR("string overflow allocating socket name"); |
4e2a8808 PMF |
633 | return -1; |
634 | } | |
635 | ||
636 | return ustcomm_connect_path(path, conn, pid); | |
637 | } | |
638 | ||
750f9da4 PMF |
639 | /* Close a connection to a traceable app. It frees the |
640 | * resources. It however does not free the | |
641 | * ustcomm_connection itself. | |
642 | */ | |
2a79ceeb PMF |
643 | |
644 | int ustcomm_close_app(struct ustcomm_connection *conn) | |
645 | { | |
646 | close(conn->fd); | |
647 | free(conn->recv_buf); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
dce0b474 PMF |
652 | static int ensure_dir_exists(const char *dir) |
653 | { | |
654 | struct stat st; | |
655 | int result; | |
656 | ||
657 | if(!strcmp(dir, "")) | |
658 | return -1; | |
659 | ||
660 | result = stat(dir, &st); | |
661 | if(result == -1 && errno != ENOENT) { | |
662 | return -1; | |
663 | } | |
664 | else if(result == -1) { | |
665 | /* ENOENT */ | |
dce0b474 PMF |
666 | int result; |
667 | ||
d6d27063 | 668 | result = mkdir_p(dir, 0777); |
dce0b474 | 669 | if(result != 0) { |
d6d27063 | 670 | ERR("executing in recursive creation of directory %s", dir); |
dce0b474 PMF |
671 | return -1; |
672 | } | |
673 | } | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
08230db7 PMF |
678 | /* Called by an application to initialize its server so daemons can |
679 | * connect to it. | |
680 | */ | |
4e2a8808 | 681 | |
d0b5f2b9 PMF |
682 | int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle) |
683 | { | |
684 | int result; | |
685 | char *name; | |
686 | ||
687 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid); | |
688 | if(result >= UNIX_PATH_MAX) { | |
689 | ERR("string overflow allocating socket name"); | |
690 | return -1; | |
691 | } | |
692 | ||
dce0b474 PMF |
693 | result = ensure_dir_exists(SOCK_DIR); |
694 | if(result == -1) { | |
695 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
696 | return -1; | |
697 | } | |
698 | ||
811e4b93 PMF |
699 | handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath)); |
700 | if(handle->server.listen_fd < 0) { | |
68ab7a5d | 701 | ERR("Error initializing named socket (%s). Check that directory exists and that it is writable.", name); |
d0b5f2b9 PMF |
702 | goto free_name; |
703 | } | |
704 | free(name); | |
705 | ||
811e4b93 | 706 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 707 | |
d0b5f2b9 PMF |
708 | return 0; |
709 | ||
710 | free_name: | |
711 | free(name); | |
712 | return -1; | |
713 | } | |
714 | ||
08230db7 PMF |
715 | /* Used by the daemon to initialize its server so applications |
716 | * can connect to it. | |
717 | */ | |
718 | ||
c97d4437 | 719 | int ustcomm_init_ustd(struct ustcomm_ustd *handle, const char *sock_path) |
d0b5f2b9 | 720 | { |
3847c3ba | 721 | char *name; |
c97d4437 | 722 | int retval = 0; |
3847c3ba | 723 | |
c97d4437 PMF |
724 | if(sock_path) { |
725 | asprintf(&name, "%s", sock_path); | |
726 | } | |
727 | else { | |
dce0b474 PMF |
728 | int result; |
729 | ||
730 | /* Only check if socket dir exists if we are using the default directory */ | |
731 | result = ensure_dir_exists(SOCK_DIR); | |
732 | if(result == -1) { | |
733 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
734 | return -1; | |
735 | } | |
736 | ||
c97d4437 | 737 | asprintf(&name, "%s/%s", SOCK_DIR, "ustd"); |
3847c3ba PMF |
738 | } |
739 | ||
811e4b93 PMF |
740 | handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath); |
741 | if(handle->server.listen_fd < 0) { | |
6cb88bc0 | 742 | ERR("error initializing named socket at %s", name); |
c97d4437 | 743 | retval = -1; |
aca1ad90 PMF |
744 | goto free_name; |
745 | } | |
d0b5f2b9 | 746 | |
811e4b93 | 747 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 748 | |
aca1ad90 PMF |
749 | free_name: |
750 | free(name); | |
c97d4437 PMF |
751 | |
752 | return retval; | |
d0b5f2b9 | 753 | } |
b02e31e5 | 754 | |
2a79ceeb | 755 | static void ustcomm_fini_server(struct ustcomm_server *server, int keep_socket_file) |
803a4f58 PMF |
756 | { |
757 | int result; | |
758 | struct stat st; | |
759 | ||
2a79ceeb PMF |
760 | if(!keep_socket_file) { |
761 | /* Destroy socket */ | |
762 | result = stat(server->socketpath, &st); | |
763 | if(result == -1) { | |
764 | PERROR("stat (%s)", server->socketpath); | |
765 | return; | |
766 | } | |
803a4f58 | 767 | |
2a79ceeb PMF |
768 | /* Paranoid check before deleting. */ |
769 | result = S_ISSOCK(st.st_mode); | |
770 | if(!result) { | |
771 | ERR("The socket we are about to delete is not a socket."); | |
772 | return; | |
773 | } | |
774 | ||
775 | result = unlink(server->socketpath); | |
776 | if(result == -1) { | |
777 | PERROR("unlink"); | |
778 | } | |
803a4f58 PMF |
779 | } |
780 | ||
2a79ceeb PMF |
781 | free(server->socketpath); |
782 | ||
783 | result = close(server->listen_fd); | |
803a4f58 | 784 | if(result == -1) { |
2a79ceeb PMF |
785 | PERROR("close"); |
786 | return; | |
803a4f58 PMF |
787 | } |
788 | } | |
789 | ||
750f9da4 PMF |
790 | /* Free a traceable application server */ |
791 | ||
2a79ceeb PMF |
792 | void ustcomm_fini_app(struct ustcomm_app *handle, int keep_socket_file) |
793 | { | |
794 | ustcomm_fini_server(&handle->server, keep_socket_file); | |
795 | } | |
796 | ||
750f9da4 PMF |
797 | /* Free a ustd server */ |
798 | ||
2a79ceeb PMF |
799 | void ustcomm_fini_ustd(struct ustcomm_ustd *handle) |
800 | { | |
801 | ustcomm_fini_server(&handle->server, 0); | |
802 | } | |
803 | ||
7e92827d | 804 | static const char *find_tok(const char *str) |
b02e31e5 PMF |
805 | { |
806 | while(*str == ' ') { | |
807 | str++; | |
808 | ||
809 | if(*str == 0) | |
810 | return NULL; | |
811 | } | |
812 | ||
813 | return str; | |
814 | } | |
815 | ||
7e92827d | 816 | static const char *find_sep(const char *str) |
b02e31e5 PMF |
817 | { |
818 | while(*str != ' ') { | |
819 | str++; | |
820 | ||
821 | if(*str == 0) | |
822 | break; | |
823 | } | |
824 | ||
825 | return str; | |
826 | } | |
827 | ||
7e92827d | 828 | int nth_token_is(const char *str, const char *token, int tok_no) |
b02e31e5 PMF |
829 | { |
830 | int i; | |
7e92827d PMF |
831 | const char *start; |
832 | const char *end; | |
b02e31e5 PMF |
833 | |
834 | for(i=0; i<=tok_no; i++) { | |
835 | str = find_tok(str); | |
836 | if(str == NULL) | |
837 | return -1; | |
838 | ||
839 | start = str; | |
840 | ||
841 | str = find_sep(str); | |
842 | if(str == NULL) | |
843 | return -1; | |
844 | ||
845 | end = str; | |
846 | } | |
847 | ||
848 | if(end-start != strlen(token)) | |
849 | return 0; | |
850 | ||
851 | if(strncmp(start, token, end-start)) | |
852 | return 0; | |
853 | ||
854 | return 1; | |
855 | } | |
856 | ||
7e92827d | 857 | char *nth_token(const char *str, int tok_no) |
b02e31e5 PMF |
858 | { |
859 | static char *retval = NULL; | |
860 | int i; | |
7e92827d PMF |
861 | const char *start; |
862 | const char *end; | |
b02e31e5 PMF |
863 | |
864 | for(i=0; i<=tok_no; i++) { | |
865 | str = find_tok(str); | |
866 | if(str == NULL) | |
867 | return NULL; | |
868 | ||
869 | start = str; | |
870 | ||
871 | str = find_sep(str); | |
872 | if(str == NULL) | |
873 | return NULL; | |
874 | ||
875 | end = str; | |
876 | } | |
877 | ||
878 | if(retval) { | |
879 | free(retval); | |
880 | retval = NULL; | |
881 | } | |
882 | ||
aca1ad90 | 883 | asprintf(&retval, "%.*s", (int)(end-start), start); |
b02e31e5 PMF |
884 | |
885 | return retval; | |
886 | } | |
887 |