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 | ||
93e5ce29 PMF |
18 | /* API used by UST components to communicate with each other via sockets. */ |
19 | ||
d0b5f2b9 | 20 | #define _GNU_SOURCE |
f9e5ce61 PMF |
21 | #include <sys/types.h> |
22 | #include <signal.h> | |
23 | #include <errno.h> | |
24 | #include <sys/socket.h> | |
25 | #include <sys/un.h> | |
d0b5f2b9 | 26 | #include <unistd.h> |
aca1ad90 | 27 | #include <poll.h> |
803a4f58 | 28 | #include <sys/stat.h> |
f9e5ce61 PMF |
29 | |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
d0b5f2b9 | 32 | #include <string.h> |
b0540e11 | 33 | #include <execinfo.h> |
d0b5f2b9 PMF |
34 | |
35 | #include "ustcomm.h" | |
6af64c43 | 36 | #include "usterr.h" |
2dae156b | 37 | #include "share.h" |
0e4b45ac | 38 | #include "multipoll.h" |
f9e5ce61 PMF |
39 | |
40 | #define UNIX_PATH_MAX 108 | |
f9e5ce61 | 41 | |
d6d27063 PMF |
42 | static int mkdir_p(const char *path, mode_t mode) |
43 | { | |
c555b133 | 44 | const char *path_p; |
d6d27063 PMF |
45 | char *tmp; |
46 | ||
47 | int retval = 0; | |
48 | int result; | |
18baca84 | 49 | mode_t old_umask; |
d6d27063 | 50 | |
7032c7d3 | 51 | tmp = zmalloc(strlen(path) + 1); |
d6d27063 PMF |
52 | if (tmp == NULL) |
53 | return -1; | |
54 | ||
55 | /* skip first / */ | |
56 | path_p = path+1; | |
57 | ||
18baca84 | 58 | old_umask = umask(0); |
d6d27063 PMF |
59 | for(;;) { |
60 | while (*path_p != '/') { | |
61 | if(*path_p == 0) | |
62 | break; | |
63 | ++path_p; | |
64 | } | |
65 | if (*path_p == '/') { | |
66 | strncpy(tmp, path, path_p - path); | |
67 | tmp[path_p-path] = '\0'; | |
68 | if (tmp[path_p - path - 1] != '/') { | |
69 | result = mkdir(tmp, mode); | |
70 | if(result == -1) { | |
71 | if (!(errno == EEXIST || errno == EACCES || errno == EROFS)) { | |
72 | /* Then this is a real error */ | |
73 | retval = -1; | |
74 | break; | |
75 | } | |
76 | } | |
77 | } | |
78 | /* pass / */ | |
79 | path_p++; | |
80 | } else { | |
81 | /* last component */ | |
82 | result = mkdir(path, mode); | |
83 | if (result == -1) | |
84 | retval = -1; | |
85 | break; | |
86 | } | |
87 | } | |
88 | ||
89 | free(tmp); | |
18baca84 | 90 | umask(old_umask); |
d6d27063 PMF |
91 | return retval; |
92 | } | |
93 | ||
52c51a47 | 94 | static int signal_process(pid_t pid) |
f9e5ce61 | 95 | { |
52c51a47 | 96 | return 0; |
f9e5ce61 PMF |
97 | } |
98 | ||
5932431b PMF |
99 | void ustcomm_init_connection(struct ustcomm_connection *conn) |
100 | { | |
101 | conn->recv_buf = NULL; | |
102 | conn->recv_buf_size = 0; | |
103 | conn->recv_buf_alloc = 0; | |
104 | } | |
105 | ||
ab33e65c | 106 | int pid_is_online(pid_t pid) { |
2944a629 | 107 | return 1; |
ab33e65c PP |
108 | } |
109 | ||
2dae156b PMF |
110 | /* Send a message |
111 | * | |
112 | * @fd: file descriptor to send to | |
113 | * @msg: a null-terminated string containing the message to send | |
114 | * | |
115 | * Return value: | |
116 | * -1: error | |
117 | * 0: connection closed | |
118 | * 1: success | |
119 | */ | |
120 | ||
4e2a8808 | 121 | static int send_message_fd(int fd, const char *msg) |
811e4b93 PMF |
122 | { |
123 | int result; | |
124 | ||
2dae156b PMF |
125 | /* Send including the final \0 */ |
126 | result = patient_send(fd, msg, strlen(msg)+1, MSG_NOSIGNAL); | |
811e4b93 | 127 | if(result == -1) { |
2dae156b PMF |
128 | if(errno != EPIPE) |
129 | PERROR("send"); | |
811e4b93 PMF |
130 | return -1; |
131 | } | |
688760ef PMF |
132 | else if(result == 0) { |
133 | return 0; | |
134 | } | |
811e4b93 | 135 | |
2dae156b | 136 | DBG("sent message \"%s\"", msg); |
688760ef | 137 | return 1; |
811e4b93 PMF |
138 | } |
139 | ||
b0540e11 PMF |
140 | /* Called by an app to ask the consumer daemon to connect to it. */ |
141 | ||
142 | int ustcomm_request_consumer(pid_t pid, const char *channel) | |
143 | { | |
144 | char path[UNIX_PATH_MAX]; | |
145 | int result; | |
08230db7 PMF |
146 | char *msg=NULL; |
147 | int retval = 0; | |
148 | struct ustcomm_connection conn; | |
c97d4437 PMF |
149 | char *explicit_daemon_socket_path; |
150 | ||
151 | explicit_daemon_socket_path = getenv("UST_DAEMON_SOCKET"); | |
152 | if(explicit_daemon_socket_path) { | |
153 | /* user specified explicitly a socket path */ | |
154 | result = snprintf(path, UNIX_PATH_MAX, "%s", explicit_daemon_socket_path); | |
155 | } | |
156 | else { | |
157 | /* just use the default path */ | |
158 | result = snprintf(path, UNIX_PATH_MAX, "%s/ustd", SOCK_DIR); | |
159 | } | |
b0540e11 | 160 | |
b0540e11 | 161 | if(result >= UNIX_PATH_MAX) { |
08230db7 | 162 | ERR("string overflow allocating socket name"); |
b0540e11 PMF |
163 | return -1; |
164 | } | |
165 | ||
08b8805e DG |
166 | if (asprintf(&msg, "collect %d %s", pid, channel) < 0) { |
167 | ERR("ustcomm_request_consumer : asprintf failed (collect %d/%s)", | |
168 | pid, channel); | |
169 | return -1; | |
170 | } | |
b0540e11 | 171 | |
08230db7 PMF |
172 | /* don't signal it because it's the daemon */ |
173 | result = ustcomm_connect_path(path, &conn, -1); | |
174 | if(result == -1) { | |
175 | WARN("ustcomm_connect_path failed"); | |
176 | retval = -1; | |
177 | goto del_string; | |
178 | } | |
179 | ||
180 | result = ustcomm_send_request(&conn, msg, NULL); | |
181 | if(result == -1) { | |
182 | WARN("ustcomm_send_request failed"); | |
183 | retval = -1; | |
184 | goto disconnect; | |
185 | } | |
186 | ||
187 | disconnect: | |
188 | ustcomm_disconnect(&conn); | |
189 | del_string: | |
b0540e11 PMF |
190 | free(msg); |
191 | ||
08230db7 | 192 | return retval; |
b0540e11 PMF |
193 | } |
194 | ||
688760ef | 195 | /* returns 1 to indicate a message was received |
da000ba4 | 196 | * returns 0 to indicate no message was received (end of stream) |
688760ef PMF |
197 | * returns -1 to indicate an error |
198 | */ | |
811e4b93 | 199 | |
5932431b | 200 | #define RECV_INCREMENT 1000 |
da000ba4 | 201 | #define RECV_INITIAL_BUF_SIZE 10 |
2dae156b | 202 | |
5932431b | 203 | static int recv_message_fd(int fd, char **recv_buf, int *recv_buf_size, int *recv_buf_alloc, char **msg) |
d0b5f2b9 | 204 | { |
d0b5f2b9 | 205 | int result; |
d0b5f2b9 | 206 | |
5932431b PMF |
207 | /* 1. Check if there is a message in the buf */ |
208 | /* 2. If not, do: | |
209 | 2.1 receive chunk and put it in buffer | |
210 | 2.2 process full message if there is one | |
211 | -- while no message arrived | |
212 | */ | |
b02e31e5 | 213 | |
2dae156b | 214 | for(;;) { |
5932431b PMF |
215 | int i; |
216 | int nulfound = 0; | |
217 | ||
218 | /* Search for full message in buffer */ | |
219 | for(i=0; i<*recv_buf_size; i++) { | |
220 | if((*recv_buf)[i] == '\0') { | |
221 | nulfound = 1; | |
222 | break; | |
da000ba4 | 223 | } |
2dae156b | 224 | } |
b0540e11 | 225 | |
5932431b PMF |
226 | /* Process found message */ |
227 | if(nulfound == 1) { | |
228 | char *newbuf; | |
229 | ||
230 | if(i == 0) { | |
231 | /* problem */ | |
2a79ceeb | 232 | WARN("received empty message"); |
5932431b PMF |
233 | } |
234 | *msg = strndup(*recv_buf, i); | |
235 | ||
236 | /* Remove processed message from buffer */ | |
237 | newbuf = (char *) malloc(*recv_buf_size - (i+1)); | |
238 | memcpy(newbuf, *recv_buf + (i+1), *recv_buf_size - (i+1)); | |
239 | free(*recv_buf); | |
240 | *recv_buf = newbuf; | |
241 | *recv_buf_size -= (i+1); | |
242 | *recv_buf_alloc -= (i+1); | |
243 | ||
244 | return 1; | |
245 | } | |
246 | ||
247 | /* Receive a chunk from the fd */ | |
248 | if(*recv_buf_alloc - *recv_buf_size < RECV_INCREMENT) { | |
249 | *recv_buf_alloc += RECV_INCREMENT - (*recv_buf_alloc - *recv_buf_size); | |
250 | *recv_buf = (char *) realloc(*recv_buf, *recv_buf_alloc); | |
251 | } | |
252 | ||
253 | result = recv(fd, *recv_buf+*recv_buf_size, RECV_INCREMENT, 0); | |
2dae156b | 254 | if(result == -1) { |
5932431b PMF |
255 | if(errno == ECONNRESET) { |
256 | *recv_buf_size = 0; | |
257 | return 0; | |
258 | } | |
f05eefd8 PMF |
259 | else if(errno == EINTR) { |
260 | return -1; | |
261 | } | |
262 | else { | |
263 | PERROR("recv"); | |
264 | return -1; | |
265 | } | |
2dae156b PMF |
266 | } |
267 | if(result == 0) { | |
5932431b | 268 | return 0; |
2dae156b | 269 | } |
5932431b | 270 | *recv_buf_size += result; |
2dae156b | 271 | |
5932431b | 272 | /* Go back to the beginning to check if there is a full message in the buffer */ |
2dae156b | 273 | } |
b0540e11 | 274 | |
5932431b | 275 | DBG("received message \"%s\"", *recv_buf); |
811e4b93 | 276 | |
688760ef | 277 | return 1; |
2dae156b | 278 | |
d0b5f2b9 PMF |
279 | } |
280 | ||
5932431b PMF |
281 | static int recv_message_conn(struct ustcomm_connection *conn, char **msg) |
282 | { | |
283 | return recv_message_fd(conn->fd, &conn->recv_buf, &conn->recv_buf_size, &conn->recv_buf_alloc, msg); | |
284 | } | |
285 | ||
811e4b93 PMF |
286 | int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src) |
287 | { | |
288 | int result; | |
289 | ||
4e2a8808 | 290 | result = send_message_fd(src->fd, msg); |
3a7b90de | 291 | if(result < 0) { |
811e4b93 PMF |
292 | ERR("error in send_message_fd"); |
293 | return -1; | |
294 | } | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
99b72dc0 PMF |
299 | /* Called after a fork. */ |
300 | ||
301 | int ustcomm_close_all_connections(struct ustcomm_server *server) | |
302 | { | |
303 | struct ustcomm_connection *conn; | |
304 | struct ustcomm_connection *deletable_conn = NULL; | |
305 | ||
306 | list_for_each_entry(conn, &server->connections, list) { | |
307 | free(deletable_conn); | |
308 | deletable_conn = conn; | |
2a79ceeb | 309 | ustcomm_close_app(conn); |
99b72dc0 PMF |
310 | list_del(&conn->list); |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
688760ef PMF |
316 | /* @timeout: max blocking time in milliseconds, -1 means infinity |
317 | * | |
318 | * returns 1 to indicate a message was received | |
319 | * returns 0 to indicate no message was received | |
320 | * returns -1 to indicate an error | |
321 | */ | |
322 | ||
323 | int ustcomm_recv_message(struct ustcomm_server *server, char **msg, struct ustcomm_source *src, int timeout) | |
b0540e11 | 324 | { |
aca1ad90 | 325 | struct pollfd *fds; |
5932431b | 326 | struct ustcomm_connection **conn_table; |
aca1ad90 PMF |
327 | struct ustcomm_connection *conn; |
328 | int result; | |
329 | int retval; | |
330 | ||
331 | for(;;) { | |
332 | int idx = 0; | |
333 | int n_fds = 1; | |
334 | ||
811e4b93 | 335 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
336 | n_fds++; |
337 | } | |
338 | ||
7032c7d3 | 339 | fds = (struct pollfd *) zmalloc(n_fds * sizeof(struct pollfd)); |
aca1ad90 | 340 | if(fds == NULL) { |
7032c7d3 | 341 | ERR("zmalloc returned NULL"); |
aca1ad90 PMF |
342 | return -1; |
343 | } | |
344 | ||
7032c7d3 | 345 | conn_table = (struct ustcomm_connection **) zmalloc(n_fds * sizeof(struct ustcomm_connection *)); |
5932431b | 346 | if(conn_table == NULL) { |
7032c7d3 | 347 | ERR("zmalloc returned NULL"); |
2a79ceeb PMF |
348 | retval = -1; |
349 | goto free_fds_return; | |
5932431b PMF |
350 | } |
351 | ||
aca1ad90 | 352 | /* special idx 0 is for listening socket */ |
811e4b93 | 353 | fds[idx].fd = server->listen_fd; |
aca1ad90 PMF |
354 | fds[idx].events = POLLIN; |
355 | idx++; | |
356 | ||
811e4b93 | 357 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
358 | fds[idx].fd = conn->fd; |
359 | fds[idx].events = POLLIN; | |
5932431b | 360 | conn_table[idx] = conn; |
aca1ad90 PMF |
361 | idx++; |
362 | } | |
363 | ||
f05eefd8 PMF |
364 | result = poll(fds, n_fds, timeout); |
365 | if(result == -1 && errno == EINTR) { | |
366 | /* That's ok. ustd receives signals to notify it must shutdown. */ | |
367 | retval = -1; | |
368 | goto free_conn_table_return; | |
369 | } | |
370 | else if(result == -1) { | |
aca1ad90 | 371 | PERROR("poll"); |
2a79ceeb PMF |
372 | retval = -1; |
373 | goto free_conn_table_return; | |
aca1ad90 | 374 | } |
f05eefd8 | 375 | else if(result == 0) { |
2a79ceeb PMF |
376 | retval = 0; |
377 | goto free_conn_table_return; | |
378 | } | |
688760ef | 379 | |
aca1ad90 PMF |
380 | if(fds[0].revents) { |
381 | struct ustcomm_connection *newconn; | |
382 | int newfd; | |
383 | ||
811e4b93 | 384 | result = newfd = accept(server->listen_fd, NULL, NULL); |
aca1ad90 PMF |
385 | if(result == -1) { |
386 | PERROR("accept"); | |
2a79ceeb PMF |
387 | retval = -1; |
388 | goto free_conn_table_return; | |
aca1ad90 PMF |
389 | } |
390 | ||
7032c7d3 | 391 | newconn = (struct ustcomm_connection *) zmalloc(sizeof(struct ustcomm_connection)); |
aca1ad90 | 392 | if(newconn == NULL) { |
7032c7d3 | 393 | ERR("zmalloc returned NULL"); |
aca1ad90 PMF |
394 | return -1; |
395 | } | |
396 | ||
5932431b | 397 | ustcomm_init_connection(newconn); |
aca1ad90 PMF |
398 | newconn->fd = newfd; |
399 | ||
811e4b93 | 400 | list_add(&newconn->list, &server->connections); |
aca1ad90 PMF |
401 | } |
402 | ||
403 | for(idx=1; idx<n_fds; idx++) { | |
404 | if(fds[idx].revents) { | |
5932431b | 405 | retval = recv_message_conn(conn_table[idx], msg); |
2dae156b PMF |
406 | if(src) |
407 | src->fd = fds[idx].fd; | |
408 | ||
e2b815a9 | 409 | if(retval == 0) { |
aca1ad90 | 410 | /* connection finished */ |
811e4b93 | 411 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 | 412 | if(conn->fd == fds[idx].fd) { |
750f9da4 | 413 | ustcomm_close_app(conn); |
aca1ad90 | 414 | list_del(&conn->list); |
750f9da4 | 415 | free(conn); |
aca1ad90 PMF |
416 | break; |
417 | } | |
418 | } | |
419 | } | |
420 | else { | |
2a79ceeb | 421 | goto free_conn_table_return; |
aca1ad90 PMF |
422 | } |
423 | } | |
424 | } | |
425 | ||
426 | free(fds); | |
2a79ceeb | 427 | free(conn_table); |
aca1ad90 PMF |
428 | } |
429 | ||
2a79ceeb PMF |
430 | free_conn_table_return: |
431 | free(conn_table); | |
aca1ad90 PMF |
432 | free_fds_return: |
433 | free(fds); | |
434 | return retval; | |
b0540e11 PMF |
435 | } |
436 | ||
688760ef | 437 | int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout) |
811e4b93 | 438 | { |
688760ef | 439 | return ustcomm_recv_message(&ustd->server, msg, src, timeout); |
811e4b93 PMF |
440 | } |
441 | ||
688760ef | 442 | int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout) |
b0540e11 | 443 | { |
688760ef | 444 | return ustcomm_recv_message(&app->server, msg, src, timeout); |
b0540e11 PMF |
445 | } |
446 | ||
46ef48cd PMF |
447 | /* This removes src from the list of active connections of app. |
448 | */ | |
449 | ||
450 | int ustcomm_app_detach_client(struct ustcomm_app *app, struct ustcomm_source *src) | |
451 | { | |
452 | struct ustcomm_server *server = (struct ustcomm_server *)app; | |
453 | struct ustcomm_connection *conn; | |
454 | ||
455 | list_for_each_entry(conn, &server->connections, list) { | |
456 | if(conn->fd == src->fd) { | |
457 | list_del(&conn->list); | |
458 | goto found; | |
459 | } | |
460 | } | |
461 | ||
462 | return -1; | |
463 | found: | |
464 | return src->fd; | |
465 | } | |
466 | ||
08230db7 | 467 | static int init_named_socket(const char *name, char **path_out) |
d0b5f2b9 PMF |
468 | { |
469 | int result; | |
470 | int fd; | |
471 | ||
472 | struct sockaddr_un addr; | |
473 | ||
aca1ad90 | 474 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
d0b5f2b9 PMF |
475 | if(result == -1) { |
476 | PERROR("socket"); | |
477 | return -1; | |
478 | } | |
479 | ||
480 | addr.sun_family = AF_UNIX; | |
481 | ||
482 | strncpy(addr.sun_path, name, UNIX_PATH_MAX); | |
483 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; | |
484 | ||
aca1ad90 PMF |
485 | result = access(name, F_OK); |
486 | if(result == 0) { | |
487 | /* file exists */ | |
488 | result = unlink(name); | |
489 | if(result == -1) { | |
490 | PERROR("unlink of socket file"); | |
491 | goto close_sock; | |
492 | } | |
69c37f74 | 493 | DBG("socket already exists; overwriting"); |
aca1ad90 PMF |
494 | } |
495 | ||
d0b5f2b9 PMF |
496 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
497 | if(result == -1) { | |
498 | PERROR("bind"); | |
499 | goto close_sock; | |
500 | } | |
501 | ||
aca1ad90 PMF |
502 | result = listen(fd, 1); |
503 | if(result == -1) { | |
504 | PERROR("listen"); | |
505 | goto close_sock; | |
506 | } | |
507 | ||
b0540e11 | 508 | if(path_out) { |
803a4f58 | 509 | *path_out = strdup(addr.sun_path); |
b0540e11 | 510 | } |
d0b5f2b9 PMF |
511 | |
512 | return fd; | |
513 | ||
514 | close_sock: | |
515 | close(fd); | |
516 | ||
517 | return -1; | |
518 | } | |
519 | ||
34b460e6 PMF |
520 | /* |
521 | * Return value: | |
522 | * 0: Success, but no reply because recv() returned 0 | |
523 | * 1: Success | |
524 | * -1: Error | |
525 | * | |
526 | * On error, the error message is printed, except on | |
527 | * ECONNRESET, which is normal when the application dies. | |
528 | */ | |
529 | ||
772030fe | 530 | int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply) |
4e2a8808 PMF |
531 | { |
532 | int result; | |
533 | ||
2dae156b PMF |
534 | /* Send including the final \0 */ |
535 | result = send_message_fd(conn->fd, req); | |
536 | if(result != 1) | |
537 | return result; | |
4e2a8808 PMF |
538 | |
539 | if(!reply) | |
540 | return 1; | |
541 | ||
5932431b | 542 | result = recv_message_conn(conn, reply); |
4e2a8808 | 543 | if(result == -1) { |
4e2a8808 PMF |
544 | return -1; |
545 | } | |
546 | else if(result == 0) { | |
547 | return 0; | |
548 | } | |
549 | ||
4e2a8808 PMF |
550 | return 1; |
551 | } | |
552 | ||
2a79ceeb PMF |
553 | /* Return value: |
554 | * 0: success | |
555 | * -1: error | |
556 | */ | |
557 | ||
08230db7 | 558 | int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid) |
4e2a8808 PMF |
559 | { |
560 | int fd; | |
561 | int result; | |
562 | struct sockaddr_un addr; | |
563 | ||
5932431b PMF |
564 | ustcomm_init_connection(conn); |
565 | ||
4e2a8808 PMF |
566 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
567 | if(result == -1) { | |
568 | PERROR("socket"); | |
569 | return -1; | |
570 | } | |
571 | ||
572 | addr.sun_family = AF_UNIX; | |
573 | ||
574 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
575 | if(result >= UNIX_PATH_MAX) { | |
576 | ERR("string overflow allocating socket name"); | |
577 | return -1; | |
578 | } | |
579 | ||
52c51a47 PMF |
580 | if(signalpid >= 0) { |
581 | result = signal_process(signalpid); | |
582 | if(result == -1) { | |
583 | ERR("could not signal process"); | |
584 | return -1; | |
585 | } | |
586 | } | |
4e2a8808 PMF |
587 | |
588 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
589 | if(result == -1) { | |
2dae156b | 590 | PERROR("connect (path=%s)", path); |
4e2a8808 PMF |
591 | return -1; |
592 | } | |
593 | ||
594 | conn->fd = fd; | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | int ustcomm_disconnect(struct ustcomm_connection *conn) | |
600 | { | |
601 | return close(conn->fd); | |
602 | } | |
603 | ||
2a79ceeb PMF |
604 | /* Open a connection to a traceable app. |
605 | * | |
606 | * Return value: | |
607 | * 0: success | |
608 | * -1: error | |
609 | */ | |
610 | ||
4e2a8808 PMF |
611 | int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn) |
612 | { | |
613 | int result; | |
614 | char path[UNIX_PATH_MAX]; | |
615 | ||
616 | ||
617 | result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid); | |
618 | if(result >= UNIX_PATH_MAX) { | |
08230db7 | 619 | ERR("string overflow allocating socket name"); |
4e2a8808 PMF |
620 | return -1; |
621 | } | |
622 | ||
623 | return ustcomm_connect_path(path, conn, pid); | |
624 | } | |
625 | ||
750f9da4 PMF |
626 | /* Close a connection to a traceable app. It frees the |
627 | * resources. It however does not free the | |
628 | * ustcomm_connection itself. | |
629 | */ | |
2a79ceeb PMF |
630 | |
631 | int ustcomm_close_app(struct ustcomm_connection *conn) | |
632 | { | |
633 | close(conn->fd); | |
634 | free(conn->recv_buf); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
dce0b474 PMF |
639 | static int ensure_dir_exists(const char *dir) |
640 | { | |
641 | struct stat st; | |
642 | int result; | |
643 | ||
644 | if(!strcmp(dir, "")) | |
645 | return -1; | |
646 | ||
647 | result = stat(dir, &st); | |
648 | if(result == -1 && errno != ENOENT) { | |
649 | return -1; | |
650 | } | |
651 | else if(result == -1) { | |
652 | /* ENOENT */ | |
dce0b474 PMF |
653 | int result; |
654 | ||
18baca84 DG |
655 | /* mkdir mode to 0777 */ |
656 | result = mkdir_p(dir, S_IRWXU | S_IRWXG | S_IRWXO); | |
dce0b474 | 657 | if(result != 0) { |
d6d27063 | 658 | ERR("executing in recursive creation of directory %s", dir); |
dce0b474 PMF |
659 | return -1; |
660 | } | |
661 | } | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
08230db7 PMF |
666 | /* Called by an application to initialize its server so daemons can |
667 | * connect to it. | |
668 | */ | |
4e2a8808 | 669 | |
d0b5f2b9 PMF |
670 | int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle) |
671 | { | |
672 | int result; | |
673 | char *name; | |
674 | ||
675 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid); | |
676 | if(result >= UNIX_PATH_MAX) { | |
677 | ERR("string overflow allocating socket name"); | |
678 | return -1; | |
679 | } | |
680 | ||
dce0b474 PMF |
681 | result = ensure_dir_exists(SOCK_DIR); |
682 | if(result == -1) { | |
683 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
684 | return -1; | |
685 | } | |
686 | ||
811e4b93 PMF |
687 | handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath)); |
688 | if(handle->server.listen_fd < 0) { | |
68ab7a5d | 689 | ERR("Error initializing named socket (%s). Check that directory exists and that it is writable.", name); |
d0b5f2b9 PMF |
690 | goto free_name; |
691 | } | |
692 | free(name); | |
693 | ||
811e4b93 | 694 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 695 | |
d0b5f2b9 PMF |
696 | return 0; |
697 | ||
698 | free_name: | |
699 | free(name); | |
700 | return -1; | |
701 | } | |
702 | ||
08230db7 PMF |
703 | /* Used by the daemon to initialize its server so applications |
704 | * can connect to it. | |
705 | */ | |
706 | ||
c97d4437 | 707 | int ustcomm_init_ustd(struct ustcomm_ustd *handle, const char *sock_path) |
d0b5f2b9 | 708 | { |
3847c3ba | 709 | char *name; |
c97d4437 | 710 | int retval = 0; |
3847c3ba | 711 | |
c97d4437 | 712 | if(sock_path) { |
08b8805e DG |
713 | if (asprintf(&name, "%s", sock_path) < 0) { |
714 | ERR("ustcomm_init_ustd : asprintf failed (sock_path %s)", | |
715 | sock_path); | |
716 | return -1; | |
717 | } | |
c97d4437 PMF |
718 | } |
719 | else { | |
dce0b474 PMF |
720 | int result; |
721 | ||
722 | /* Only check if socket dir exists if we are using the default directory */ | |
723 | result = ensure_dir_exists(SOCK_DIR); | |
724 | if(result == -1) { | |
725 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
726 | return -1; | |
727 | } | |
728 | ||
08b8805e DG |
729 | if (asprintf(&name, "%s/%s", SOCK_DIR, "ustd") < 0) { |
730 | ERR("ustcomm_init_ustd : asprintf failed (%s/ustd)", | |
731 | SOCK_DIR); | |
732 | return -1; | |
733 | } | |
3847c3ba PMF |
734 | } |
735 | ||
811e4b93 PMF |
736 | handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath); |
737 | if(handle->server.listen_fd < 0) { | |
6cb88bc0 | 738 | ERR("error initializing named socket at %s", name); |
c97d4437 | 739 | retval = -1; |
aca1ad90 PMF |
740 | goto free_name; |
741 | } | |
d0b5f2b9 | 742 | |
811e4b93 | 743 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 744 | |
aca1ad90 PMF |
745 | free_name: |
746 | free(name); | |
c97d4437 PMF |
747 | |
748 | return retval; | |
d0b5f2b9 | 749 | } |
b02e31e5 | 750 | |
2a79ceeb | 751 | static void ustcomm_fini_server(struct ustcomm_server *server, int keep_socket_file) |
803a4f58 PMF |
752 | { |
753 | int result; | |
754 | struct stat st; | |
755 | ||
2a79ceeb PMF |
756 | if(!keep_socket_file) { |
757 | /* Destroy socket */ | |
758 | result = stat(server->socketpath, &st); | |
759 | if(result == -1) { | |
760 | PERROR("stat (%s)", server->socketpath); | |
761 | return; | |
762 | } | |
803a4f58 | 763 | |
2a79ceeb PMF |
764 | /* Paranoid check before deleting. */ |
765 | result = S_ISSOCK(st.st_mode); | |
766 | if(!result) { | |
767 | ERR("The socket we are about to delete is not a socket."); | |
768 | return; | |
769 | } | |
770 | ||
771 | result = unlink(server->socketpath); | |
772 | if(result == -1) { | |
773 | PERROR("unlink"); | |
774 | } | |
803a4f58 PMF |
775 | } |
776 | ||
2a79ceeb PMF |
777 | free(server->socketpath); |
778 | ||
779 | result = close(server->listen_fd); | |
803a4f58 | 780 | if(result == -1) { |
2a79ceeb PMF |
781 | PERROR("close"); |
782 | return; | |
803a4f58 PMF |
783 | } |
784 | } | |
785 | ||
750f9da4 PMF |
786 | /* Free a traceable application server */ |
787 | ||
2a79ceeb PMF |
788 | void ustcomm_fini_app(struct ustcomm_app *handle, int keep_socket_file) |
789 | { | |
790 | ustcomm_fini_server(&handle->server, keep_socket_file); | |
791 | } | |
792 | ||
750f9da4 PMF |
793 | /* Free a ustd server */ |
794 | ||
2a79ceeb PMF |
795 | void ustcomm_fini_ustd(struct ustcomm_ustd *handle) |
796 | { | |
797 | ustcomm_fini_server(&handle->server, 0); | |
798 | } | |
799 | ||
7e92827d | 800 | static const char *find_tok(const char *str) |
b02e31e5 PMF |
801 | { |
802 | while(*str == ' ') { | |
803 | str++; | |
804 | ||
805 | if(*str == 0) | |
806 | return NULL; | |
807 | } | |
808 | ||
809 | return str; | |
810 | } | |
811 | ||
7e92827d | 812 | static const char *find_sep(const char *str) |
b02e31e5 PMF |
813 | { |
814 | while(*str != ' ') { | |
815 | str++; | |
816 | ||
817 | if(*str == 0) | |
818 | break; | |
819 | } | |
820 | ||
821 | return str; | |
822 | } | |
823 | ||
7e92827d | 824 | int nth_token_is(const char *str, const char *token, int tok_no) |
b02e31e5 PMF |
825 | { |
826 | int i; | |
7e92827d PMF |
827 | const char *start; |
828 | const char *end; | |
b02e31e5 PMF |
829 | |
830 | for(i=0; i<=tok_no; i++) { | |
831 | str = find_tok(str); | |
832 | if(str == NULL) | |
833 | return -1; | |
834 | ||
835 | start = str; | |
836 | ||
837 | str = find_sep(str); | |
838 | if(str == NULL) | |
839 | return -1; | |
840 | ||
841 | end = str; | |
842 | } | |
843 | ||
844 | if(end-start != strlen(token)) | |
845 | return 0; | |
846 | ||
847 | if(strncmp(start, token, end-start)) | |
848 | return 0; | |
849 | ||
850 | return 1; | |
851 | } | |
852 | ||
7e92827d | 853 | char *nth_token(const char *str, int tok_no) |
b02e31e5 PMF |
854 | { |
855 | static char *retval = NULL; | |
856 | int i; | |
7e92827d PMF |
857 | const char *start; |
858 | const char *end; | |
b02e31e5 PMF |
859 | |
860 | for(i=0; i<=tok_no; i++) { | |
861 | str = find_tok(str); | |
862 | if(str == NULL) | |
863 | return NULL; | |
864 | ||
865 | start = str; | |
866 | ||
867 | str = find_sep(str); | |
868 | if(str == NULL) | |
869 | return NULL; | |
870 | ||
871 | end = str; | |
872 | } | |
873 | ||
874 | if(retval) { | |
875 | free(retval); | |
876 | retval = NULL; | |
877 | } | |
878 | ||
08b8805e DG |
879 | if (asprintf(&retval, "%.*s", (int)(end-start), start) < 0) { |
880 | ERR("nth_token : asprintf failed (%.*s)", | |
881 | (int)(end-start), start); | |
882 | return NULL; | |
883 | } | |
b02e31e5 PMF |
884 | |
885 | return retval; | |
886 | } | |
887 | ||
0e4b45ac PMF |
888 | /* Callback from multipoll. |
889 | * Receive a new connection on the listening socket. | |
890 | */ | |
891 | ||
892 | static int process_mp_incoming_conn(void *priv, int fd, short events) | |
893 | { | |
894 | struct ustcomm_connection *newconn; | |
895 | struct ustcomm_server *server = (struct ustcomm_server *) priv; | |
896 | int newfd; | |
897 | int result; | |
898 | ||
899 | result = newfd = accept(server->listen_fd, NULL, NULL); | |
900 | if(result == -1) { | |
901 | PERROR("accept"); | |
902 | return -1; | |
903 | } | |
904 | ||
7032c7d3 | 905 | newconn = (struct ustcomm_connection *) zmalloc(sizeof(struct ustcomm_connection)); |
0e4b45ac | 906 | if(newconn == NULL) { |
7032c7d3 | 907 | ERR("zmalloc returned NULL"); |
0e4b45ac PMF |
908 | return -1; |
909 | } | |
910 | ||
911 | ustcomm_init_connection(newconn); | |
912 | newconn->fd = newfd; | |
913 | ||
914 | list_add(&newconn->list, &server->connections); | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | /* Callback from multipoll. | |
920 | * Receive a message on an existing connection. | |
921 | */ | |
922 | ||
923 | static int process_mp_conn_msg(void *priv, int fd, short revents) | |
924 | { | |
925 | struct ustcomm_multipoll_conn_info *mpinfo = (struct ustcomm_multipoll_conn_info *) priv; | |
926 | int result; | |
927 | char *msg; | |
928 | struct ustcomm_source src; | |
929 | ||
930 | if(revents) { | |
931 | src.fd = fd; | |
932 | ||
933 | result = recv_message_conn(mpinfo->conn, &msg); | |
934 | if(result == -1) { | |
935 | ERR("error in recv_message_conn"); | |
936 | } | |
937 | ||
938 | else if(result == 0) { | |
939 | /* connection finished */ | |
940 | ustcomm_close_app(mpinfo->conn); | |
941 | list_del(&mpinfo->conn->list); | |
942 | free(mpinfo->conn); | |
943 | } | |
944 | else { | |
945 | mpinfo->cb(msg, &src); | |
946 | free(msg); | |
947 | } | |
948 | } | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
953 | int free_ustcomm_client_poll(void *data) | |
954 | { | |
955 | free(data); | |
956 | return 0; | |
957 | } | |
958 | ||
7a9b5b69 | 959 | void ustcomm_mp_add_app_clients(struct mpentries *ent, struct ustcomm_app *app, int (*cb)(char *recvbuf, struct ustcomm_source *src)) |
0e4b45ac PMF |
960 | { |
961 | struct ustcomm_connection *conn; | |
962 | ||
963 | /* add listener socket */ | |
964 | multipoll_add(ent, app->server.listen_fd, POLLIN, process_mp_incoming_conn, &app->server, NULL); | |
965 | ||
966 | list_for_each_entry(conn, &app->server.connections, list) { | |
7032c7d3 | 967 | struct ustcomm_multipoll_conn_info *mpinfo = (struct ustcomm_multipoll_conn_info *) zmalloc(sizeof(struct ustcomm_multipoll_conn_info)); |
0e4b45ac PMF |
968 | mpinfo->conn = conn; |
969 | mpinfo->cb = cb; | |
970 | multipoll_add(ent, conn->fd, POLLIN, process_mp_conn_msg, mpinfo, free_ustcomm_client_poll); | |
971 | } | |
972 | } |