| 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 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <sys/types.h> |
| 20 | #include <signal.h> |
| 21 | #include <errno.h> |
| 22 | #include <sys/socket.h> |
| 23 | #include <sys/un.h> |
| 24 | #include <unistd.h> |
| 25 | #include <poll.h> |
| 26 | #include <sys/stat.h> |
| 27 | |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include <execinfo.h> |
| 32 | |
| 33 | #include "ustcomm.h" |
| 34 | #include "usterr.h" |
| 35 | #include "share.h" |
| 36 | |
| 37 | #define UNIX_PATH_MAX 108 |
| 38 | |
| 39 | #define MSG_MAX 10000 |
| 40 | |
| 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 | |
| 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 | //} |
| 54 | |
| 55 | static int mkdir_p(const char *path, mode_t mode) |
| 56 | { |
| 57 | const char *path_p; |
| 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 | |
| 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 | |
| 118 | static int signal_process(pid_t pid) |
| 119 | { |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 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 | |
| 130 | int pid_is_online(pid_t pid) { |
| 131 | return 1; |
| 132 | } |
| 133 | |
| 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 | |
| 145 | static int send_message_fd(int fd, const char *msg) |
| 146 | { |
| 147 | int result; |
| 148 | |
| 149 | /* Send including the final \0 */ |
| 150 | result = patient_send(fd, msg, strlen(msg)+1, MSG_NOSIGNAL); |
| 151 | if(result == -1) { |
| 152 | if(errno != EPIPE) |
| 153 | PERROR("send"); |
| 154 | return -1; |
| 155 | } |
| 156 | else if(result == 0) { |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | DBG("sent message \"%s\"", msg); |
| 161 | return 1; |
| 162 | } |
| 163 | |
| 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; |
| 170 | char *msg=NULL; |
| 171 | int retval = 0; |
| 172 | struct ustcomm_connection conn; |
| 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 | } |
| 184 | |
| 185 | if(result >= UNIX_PATH_MAX) { |
| 186 | ERR("string overflow allocating socket name"); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | asprintf(&msg, "collect %d %s", pid, channel); |
| 191 | |
| 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: |
| 210 | free(msg); |
| 211 | |
| 212 | return retval; |
| 213 | } |
| 214 | |
| 215 | /* returns 1 to indicate a message was received |
| 216 | * returns 0 to indicate no message was received (end of stream) |
| 217 | * returns -1 to indicate an error |
| 218 | */ |
| 219 | |
| 220 | #define RECV_INCREMENT 1000 |
| 221 | #define RECV_INITIAL_BUF_SIZE 10 |
| 222 | |
| 223 | static int recv_message_fd(int fd, char **recv_buf, int *recv_buf_size, int *recv_buf_alloc, char **msg) |
| 224 | { |
| 225 | int result; |
| 226 | |
| 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 | */ |
| 233 | |
| 234 | for(;;) { |
| 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; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | /* Process found message */ |
| 247 | if(nulfound == 1) { |
| 248 | char *newbuf; |
| 249 | |
| 250 | if(i == 0) { |
| 251 | /* problem */ |
| 252 | WARN("received empty message"); |
| 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); |
| 274 | if(result == -1) { |
| 275 | if(errno == ECONNRESET) { |
| 276 | *recv_buf_size = 0; |
| 277 | return 0; |
| 278 | } |
| 279 | /* real error */ |
| 280 | PERROR("recv"); |
| 281 | return -1; |
| 282 | } |
| 283 | if(result == 0) { |
| 284 | return 0; |
| 285 | } |
| 286 | *recv_buf_size += result; |
| 287 | |
| 288 | /* Go back to the beginning to check if there is a full message in the buffer */ |
| 289 | } |
| 290 | |
| 291 | DBG("received message \"%s\"", *recv_buf); |
| 292 | |
| 293 | return 1; |
| 294 | |
| 295 | } |
| 296 | |
| 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 | |
| 302 | int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src) |
| 303 | { |
| 304 | int result; |
| 305 | |
| 306 | result = send_message_fd(src->fd, msg); |
| 307 | if(result < 0) { |
| 308 | ERR("error in send_message_fd"); |
| 309 | return -1; |
| 310 | } |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 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; |
| 325 | ustcomm_close_app(conn); |
| 326 | list_del(&conn->list); |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 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) |
| 340 | { |
| 341 | struct pollfd *fds; |
| 342 | struct ustcomm_connection **conn_table; |
| 343 | struct ustcomm_connection *conn; |
| 344 | int result; |
| 345 | int retval; |
| 346 | |
| 347 | for(;;) { |
| 348 | int idx = 0; |
| 349 | int n_fds = 1; |
| 350 | |
| 351 | list_for_each_entry(conn, &server->connections, list) { |
| 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 | |
| 361 | conn_table = (struct ustcomm_connection **) malloc(n_fds * sizeof(struct ustcomm_connection *)); |
| 362 | if(conn_table == NULL) { |
| 363 | ERR("malloc returned NULL"); |
| 364 | retval = -1; |
| 365 | goto free_fds_return; |
| 366 | } |
| 367 | |
| 368 | /* special idx 0 is for listening socket */ |
| 369 | fds[idx].fd = server->listen_fd; |
| 370 | fds[idx].events = POLLIN; |
| 371 | idx++; |
| 372 | |
| 373 | list_for_each_entry(conn, &server->connections, list) { |
| 374 | fds[idx].fd = conn->fd; |
| 375 | fds[idx].events = POLLIN; |
| 376 | conn_table[idx] = conn; |
| 377 | idx++; |
| 378 | } |
| 379 | |
| 380 | while((result = poll(fds, n_fds, timeout)) == -1 && errno == EINTR) |
| 381 | /* nothing */; |
| 382 | if(result == -1) { |
| 383 | PERROR("poll"); |
| 384 | retval = -1; |
| 385 | goto free_conn_table_return; |
| 386 | } |
| 387 | |
| 388 | if(result == 0) { |
| 389 | retval = 0; |
| 390 | goto free_conn_table_return; |
| 391 | } |
| 392 | |
| 393 | if(fds[0].revents) { |
| 394 | struct ustcomm_connection *newconn; |
| 395 | int newfd; |
| 396 | |
| 397 | result = newfd = accept(server->listen_fd, NULL, NULL); |
| 398 | if(result == -1) { |
| 399 | PERROR("accept"); |
| 400 | retval = -1; |
| 401 | goto free_conn_table_return; |
| 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 | |
| 410 | ustcomm_init_connection(newconn); |
| 411 | newconn->fd = newfd; |
| 412 | |
| 413 | list_add(&newconn->list, &server->connections); |
| 414 | } |
| 415 | |
| 416 | for(idx=1; idx<n_fds; idx++) { |
| 417 | if(fds[idx].revents) { |
| 418 | retval = recv_message_conn(conn_table[idx], msg); |
| 419 | if(src) |
| 420 | src->fd = fds[idx].fd; |
| 421 | |
| 422 | if(retval == 0) { |
| 423 | /* connection finished */ |
| 424 | list_for_each_entry(conn, &server->connections, list) { |
| 425 | if(conn->fd == fds[idx].fd) { |
| 426 | ustcomm_close_app(conn); |
| 427 | list_del(&conn->list); |
| 428 | free(conn); |
| 429 | break; |
| 430 | } |
| 431 | } |
| 432 | } |
| 433 | else { |
| 434 | goto free_conn_table_return; |
| 435 | } |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | free(fds); |
| 440 | free(conn_table); |
| 441 | } |
| 442 | |
| 443 | free_conn_table_return: |
| 444 | free(conn_table); |
| 445 | free_fds_return: |
| 446 | free(fds); |
| 447 | return retval; |
| 448 | } |
| 449 | |
| 450 | int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout) |
| 451 | { |
| 452 | return ustcomm_recv_message(&ustd->server, msg, src, timeout); |
| 453 | } |
| 454 | |
| 455 | int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout) |
| 456 | { |
| 457 | return ustcomm_recv_message(&app->server, msg, src, timeout); |
| 458 | } |
| 459 | |
| 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 | |
| 480 | static int init_named_socket(const char *name, char **path_out) |
| 481 | { |
| 482 | int result; |
| 483 | int fd; |
| 484 | |
| 485 | struct sockaddr_un addr; |
| 486 | |
| 487 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
| 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 | |
| 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 | } |
| 506 | WARN("socket already exists; overwriting"); |
| 507 | } |
| 508 | |
| 509 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 510 | if(result == -1) { |
| 511 | PERROR("bind"); |
| 512 | goto close_sock; |
| 513 | } |
| 514 | |
| 515 | result = listen(fd, 1); |
| 516 | if(result == -1) { |
| 517 | PERROR("listen"); |
| 518 | goto close_sock; |
| 519 | } |
| 520 | |
| 521 | if(path_out) { |
| 522 | *path_out = strdup(addr.sun_path); |
| 523 | } |
| 524 | |
| 525 | return fd; |
| 526 | |
| 527 | close_sock: |
| 528 | close(fd); |
| 529 | |
| 530 | return -1; |
| 531 | } |
| 532 | |
| 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 | |
| 543 | int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply) |
| 544 | { |
| 545 | int result; |
| 546 | |
| 547 | /* Send including the final \0 */ |
| 548 | result = send_message_fd(conn->fd, req); |
| 549 | if(result != 1) |
| 550 | return result; |
| 551 | |
| 552 | if(!reply) |
| 553 | return 1; |
| 554 | |
| 555 | result = recv_message_conn(conn, reply); |
| 556 | if(result == -1) { |
| 557 | return -1; |
| 558 | } |
| 559 | else if(result == 0) { |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | return 1; |
| 564 | } |
| 565 | |
| 566 | /* Return value: |
| 567 | * 0: success |
| 568 | * -1: error |
| 569 | */ |
| 570 | |
| 571 | int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid) |
| 572 | { |
| 573 | int fd; |
| 574 | int result; |
| 575 | struct sockaddr_un addr; |
| 576 | |
| 577 | ustcomm_init_connection(conn); |
| 578 | |
| 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 | |
| 593 | if(signalpid >= 0) { |
| 594 | result = signal_process(signalpid); |
| 595 | if(result == -1) { |
| 596 | ERR("could not signal process"); |
| 597 | return -1; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 602 | if(result == -1) { |
| 603 | PERROR("connect (path=%s)", path); |
| 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 | |
| 617 | /* Open a connection to a traceable app. |
| 618 | * |
| 619 | * Return value: |
| 620 | * 0: success |
| 621 | * -1: error |
| 622 | */ |
| 623 | |
| 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) { |
| 632 | ERR("string overflow allocating socket name"); |
| 633 | return -1; |
| 634 | } |
| 635 | |
| 636 | return ustcomm_connect_path(path, conn, pid); |
| 637 | } |
| 638 | |
| 639 | /* Close a connection to a traceable app. It frees the |
| 640 | * resources. It however does not free the |
| 641 | * ustcomm_connection itself. |
| 642 | */ |
| 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 | |
| 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 */ |
| 666 | int result; |
| 667 | |
| 668 | result = mkdir_p(dir, 0777); |
| 669 | if(result != 0) { |
| 670 | ERR("executing in recursive creation of directory %s", dir); |
| 671 | return -1; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | /* Called by an application to initialize its server so daemons can |
| 679 | * connect to it. |
| 680 | */ |
| 681 | |
| 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 | |
| 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 | |
| 699 | handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath)); |
| 700 | if(handle->server.listen_fd < 0) { |
| 701 | ERR("Error initializing named socket (%s). Check that directory exists and that it is writable.", name); |
| 702 | goto free_name; |
| 703 | } |
| 704 | free(name); |
| 705 | |
| 706 | INIT_LIST_HEAD(&handle->server.connections); |
| 707 | |
| 708 | return 0; |
| 709 | |
| 710 | free_name: |
| 711 | free(name); |
| 712 | return -1; |
| 713 | } |
| 714 | |
| 715 | /* Used by the daemon to initialize its server so applications |
| 716 | * can connect to it. |
| 717 | */ |
| 718 | |
| 719 | int ustcomm_init_ustd(struct ustcomm_ustd *handle, const char *sock_path) |
| 720 | { |
| 721 | char *name; |
| 722 | int retval = 0; |
| 723 | |
| 724 | if(sock_path) { |
| 725 | asprintf(&name, "%s", sock_path); |
| 726 | } |
| 727 | else { |
| 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 | |
| 737 | asprintf(&name, "%s/%s", SOCK_DIR, "ustd"); |
| 738 | } |
| 739 | |
| 740 | handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath); |
| 741 | if(handle->server.listen_fd < 0) { |
| 742 | ERR("error initializing named socket at %s", name); |
| 743 | retval = -1; |
| 744 | goto free_name; |
| 745 | } |
| 746 | |
| 747 | INIT_LIST_HEAD(&handle->server.connections); |
| 748 | |
| 749 | free_name: |
| 750 | free(name); |
| 751 | |
| 752 | return retval; |
| 753 | } |
| 754 | |
| 755 | static void ustcomm_fini_server(struct ustcomm_server *server, int keep_socket_file) |
| 756 | { |
| 757 | int result; |
| 758 | struct stat st; |
| 759 | |
| 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 | } |
| 767 | |
| 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 | } |
| 779 | } |
| 780 | |
| 781 | free(server->socketpath); |
| 782 | |
| 783 | result = close(server->listen_fd); |
| 784 | if(result == -1) { |
| 785 | PERROR("close"); |
| 786 | return; |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | /* Free a traceable application server */ |
| 791 | |
| 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 | |
| 797 | /* Free a ustd server */ |
| 798 | |
| 799 | void ustcomm_fini_ustd(struct ustcomm_ustd *handle) |
| 800 | { |
| 801 | ustcomm_fini_server(&handle->server, 0); |
| 802 | } |
| 803 | |
| 804 | static const char *find_tok(const char *str) |
| 805 | { |
| 806 | while(*str == ' ') { |
| 807 | str++; |
| 808 | |
| 809 | if(*str == 0) |
| 810 | return NULL; |
| 811 | } |
| 812 | |
| 813 | return str; |
| 814 | } |
| 815 | |
| 816 | static const char *find_sep(const char *str) |
| 817 | { |
| 818 | while(*str != ' ') { |
| 819 | str++; |
| 820 | |
| 821 | if(*str == 0) |
| 822 | break; |
| 823 | } |
| 824 | |
| 825 | return str; |
| 826 | } |
| 827 | |
| 828 | int nth_token_is(const char *str, const char *token, int tok_no) |
| 829 | { |
| 830 | int i; |
| 831 | const char *start; |
| 832 | const char *end; |
| 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 | |
| 857 | char *nth_token(const char *str, int tok_no) |
| 858 | { |
| 859 | static char *retval = NULL; |
| 860 | int i; |
| 861 | const char *start; |
| 862 | const char *end; |
| 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 | |
| 883 | asprintf(&retval, "%.*s", (int)(end-start), start); |
| 884 | |
| 885 | return retval; |
| 886 | } |
| 887 | |