1 /* $OpenBSD: cmd-queue.c,v 1.74 2019/06/18 11:08:42 nicm Exp $ */ 2 3 /* 4 * Copyright (c) 2013 Nicholas Marriott <nicholas.marriott@gmail.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 21 #include <ctype.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <time.h> 25 26 #include "tmux.h" 27 28 /* Global command queue. */ 29 static struct cmdq_list global_queue = TAILQ_HEAD_INITIALIZER(global_queue); 30 31 /* Get command queue name. */ 32 static const char * 33 cmdq_name(struct client *c) 34 { 35 static char s[256]; 36 37 if (c == NULL) 38 return ("<global>"); 39 if (c->name != NULL) 40 xsnprintf(s, sizeof s, "<%s>", c->name); 41 else 42 xsnprintf(s, sizeof s, "<%p>", c); 43 return (s); 44 } 45 46 /* Get command queue from client. */ 47 static struct cmdq_list * 48 cmdq_get(struct client *c) 49 { 50 if (c == NULL) 51 return (&global_queue); 52 return (&c->queue); 53 } 54 55 /* Append an item. */ 56 void 57 cmdq_append(struct client *c, struct cmdq_item *item) 58 { 59 struct cmdq_list *queue = cmdq_get(c); 60 struct cmdq_item *next; 61 62 do { 63 next = item->next; 64 item->next = NULL; 65 66 if (c != NULL) 67 c->references++; 68 item->client = c; 69 70 item->queue = queue; 71 TAILQ_INSERT_TAIL(queue, item, entry); 72 log_debug("%s %s: %s", __func__, cmdq_name(c), item->name); 73 74 item = next; 75 } while (item != NULL); 76 } 77 78 /* Insert an item. */ 79 void 80 cmdq_insert_after(struct cmdq_item *after, struct cmdq_item *item) 81 { 82 struct client *c = after->client; 83 struct cmdq_list *queue = after->queue; 84 struct cmdq_item *next; 85 86 do { 87 next = item->next; 88 item->next = after->next; 89 after->next = item; 90 91 if (c != NULL) 92 c->references++; 93 item->client = c; 94 95 item->queue = queue; 96 TAILQ_INSERT_AFTER(queue, after, item, entry); 97 log_debug("%s %s: %s after %s", __func__, cmdq_name(c), 98 item->name, after->name); 99 100 after = item; 101 item = next; 102 } while (item != NULL); 103 } 104 105 106 /* Insert a hook. */ 107 void 108 cmdq_insert_hook(struct session *s, struct cmdq_item *item, 109 struct cmd_find_state *fs, const char *fmt, ...) 110 { 111 struct options *oo; 112 va_list ap; 113 char *name; 114 struct cmdq_item *new_item; 115 struct options_entry *o; 116 struct options_array_item *a; 117 struct cmd_list *cmdlist; 118 119 if (item->flags & CMDQ_NOHOOKS) 120 return; 121 if (s == NULL) 122 oo = global_s_options; 123 else 124 oo = s->options; 125 126 va_start(ap, fmt); 127 xvasprintf(&name, fmt, ap); 128 va_end(ap); 129 130 o = options_get(oo, name); 131 if (o == NULL) { 132 free(name); 133 return; 134 } 135 log_debug("running hook %s (parent %p)", name, item); 136 137 a = options_array_first(o); 138 while (a != NULL) { 139 cmdlist = options_array_item_value(a)->cmdlist; 140 if (cmdlist == NULL) { 141 a = options_array_next(a); 142 continue; 143 } 144 145 new_item = cmdq_get_command(cmdlist, fs, NULL, CMDQ_NOHOOKS); 146 cmdq_format(new_item, "hook", "%s", name); 147 if (item != NULL) { 148 cmdq_insert_after(item, new_item); 149 item = new_item; 150 } else 151 cmdq_append(NULL, new_item); 152 153 a = options_array_next(a); 154 } 155 156 free(name); 157 } 158 159 /* Continue processing command queue. */ 160 void 161 cmdq_continue(struct cmdq_item *item) 162 { 163 item->flags &= ~CMDQ_WAITING; 164 } 165 166 /* Remove an item. */ 167 static void 168 cmdq_remove(struct cmdq_item *item) 169 { 170 if (item->shared != NULL && --item->shared->references == 0) { 171 if (item->shared->formats != NULL) 172 format_free(item->shared->formats); 173 free(item->shared); 174 } 175 176 if (item->client != NULL) 177 server_client_unref(item->client); 178 179 if (item->cmdlist != NULL) 180 cmd_list_free(item->cmdlist); 181 182 TAILQ_REMOVE(item->queue, item, entry); 183 184 free(item->name); 185 free(item); 186 } 187 188 /* Remove all subsequent items that match this item's group. */ 189 static void 190 cmdq_remove_group(struct cmdq_item *item) 191 { 192 struct cmdq_item *this, *next; 193 194 if (item->group == 0) 195 return; 196 this = TAILQ_NEXT(item, entry); 197 while (this != NULL) { 198 next = TAILQ_NEXT(this, entry); 199 if (this->group == item->group) 200 cmdq_remove(this); 201 this = next; 202 } 203 } 204 205 /* Get a command for the command queue. */ 206 struct cmdq_item * 207 cmdq_get_command(struct cmd_list *cmdlist, struct cmd_find_state *current, 208 struct mouse_event *m, int flags) 209 { 210 struct cmdq_item *item, *first = NULL, *last = NULL; 211 struct cmd *cmd; 212 struct cmdq_shared *shared = NULL; 213 u_int group = 0; 214 215 TAILQ_FOREACH(cmd, &cmdlist->list, qentry) { 216 if (cmd->group != group) { 217 shared = xcalloc(1, sizeof *shared); 218 if (current != NULL) 219 cmd_find_copy_state(&shared->current, current); 220 else 221 cmd_find_clear_state(&shared->current, 0); 222 if (m != NULL) 223 memcpy(&shared->mouse, m, sizeof shared->mouse); 224 group = cmd->group; 225 } 226 227 item = xcalloc(1, sizeof *item); 228 xasprintf(&item->name, "[%s/%p]", cmd->entry->name, item); 229 item->type = CMDQ_COMMAND; 230 231 item->group = cmd->group; 232 item->flags = flags; 233 234 item->shared = shared; 235 item->cmdlist = cmdlist; 236 item->cmd = cmd; 237 238 log_debug("%s: %s group %u", __func__, item->name, item->group); 239 240 shared->references++; 241 cmdlist->references++; 242 243 if (first == NULL) 244 first = item; 245 if (last != NULL) 246 last->next = item; 247 last = item; 248 } 249 return (first); 250 } 251 252 /* Fill in flag for a command. */ 253 static enum cmd_retval 254 cmdq_find_flag(struct cmdq_item *item, struct cmd_find_state *fs, 255 const struct cmd_entry_flag *flag) 256 { 257 const char *value; 258 259 if (flag->flag == 0) { 260 cmd_find_clear_state(fs, 0); 261 return (CMD_RETURN_NORMAL); 262 } 263 264 value = args_get(item->cmd->args, flag->flag); 265 if (cmd_find_target(fs, item, value, flag->type, flag->flags) != 0) { 266 cmd_find_clear_state(fs, 0); 267 return (CMD_RETURN_ERROR); 268 } 269 return (CMD_RETURN_NORMAL); 270 } 271 272 /* Fire command on command queue. */ 273 static enum cmd_retval 274 cmdq_fire_command(struct cmdq_item *item) 275 { 276 struct client *c = item->client; 277 const char *name = cmdq_name(c); 278 struct cmdq_shared *shared = item->shared; 279 struct cmd *cmd = item->cmd; 280 const struct cmd_entry *entry = cmd->entry; 281 enum cmd_retval retval; 282 struct cmd_find_state *fsp, fs; 283 int flags; 284 char *tmp; 285 286 if (log_get_level() > 1) { 287 tmp = cmd_print(cmd); 288 log_debug("%s %s: (%u) %s", __func__, name, item->group, tmp); 289 free(tmp); 290 } 291 292 flags = !!(shared->flags & CMDQ_SHARED_CONTROL); 293 cmdq_guard(item, "begin", flags); 294 295 if (item->client == NULL) 296 item->client = cmd_find_client(item, NULL, 1); 297 retval = cmdq_find_flag(item, &item->source, &entry->source); 298 if (retval == CMD_RETURN_ERROR) 299 goto out; 300 retval = cmdq_find_flag(item, &item->target, &entry->target); 301 if (retval == CMD_RETURN_ERROR) 302 goto out; 303 304 retval = entry->exec(cmd, item); 305 if (retval == CMD_RETURN_ERROR) 306 goto out; 307 308 if (entry->flags & CMD_AFTERHOOK) { 309 if (cmd_find_valid_state(&item->target)) 310 fsp = &item->target; 311 else if (cmd_find_valid_state(&item->shared->current)) 312 fsp = &item->shared->current; 313 else if (cmd_find_from_client(&fs, item->client, 0) == 0) 314 fsp = &fs; 315 else 316 goto out; 317 cmdq_insert_hook(fsp->s, item, fsp, "after-%s", entry->name); 318 } 319 320 out: 321 item->client = c; 322 if (retval == CMD_RETURN_ERROR) 323 cmdq_guard(item, "error", flags); 324 else 325 cmdq_guard(item, "end", flags); 326 return (retval); 327 } 328 329 /* Get a callback for the command queue. */ 330 struct cmdq_item * 331 cmdq_get_callback1(const char *name, cmdq_cb cb, void *data) 332 { 333 struct cmdq_item *item; 334 335 item = xcalloc(1, sizeof *item); 336 xasprintf(&item->name, "[%s/%p]", name, item); 337 item->type = CMDQ_CALLBACK; 338 339 item->group = 0; 340 item->flags = 0; 341 342 item->cb = cb; 343 item->data = data; 344 345 return (item); 346 } 347 348 /* Generic error callback. */ 349 static enum cmd_retval 350 cmdq_error_callback(struct cmdq_item *item, void *data) 351 { 352 char *error = data; 353 354 cmdq_error(item, "%s", error); 355 free(error); 356 357 return (CMD_RETURN_NORMAL); 358 } 359 360 /* Get an error callback for the command queue. */ 361 struct cmdq_item * 362 cmdq_get_error(const char *error) 363 { 364 return (cmdq_get_callback(cmdq_error_callback, xstrdup(error))); 365 } 366 367 /* Fire callback on callback queue. */ 368 static enum cmd_retval 369 cmdq_fire_callback(struct cmdq_item *item) 370 { 371 return (item->cb(item, item->data)); 372 } 373 374 /* Add a format to command queue. */ 375 void 376 cmdq_format(struct cmdq_item *item, const char *key, const char *fmt, ...) 377 { 378 struct cmdq_shared *shared = item->shared; 379 va_list ap; 380 char *value; 381 382 va_start(ap, fmt); 383 xvasprintf(&value, fmt, ap); 384 va_end(ap); 385 386 if (shared->formats == NULL) 387 shared->formats = format_create(NULL, NULL, FORMAT_NONE, 0); 388 format_add(shared->formats, key, "%s", value); 389 390 free(value); 391 } 392 393 /* Process next item on command queue. */ 394 u_int 395 cmdq_next(struct client *c) 396 { 397 struct cmdq_list *queue = cmdq_get(c); 398 const char *name = cmdq_name(c); 399 struct cmdq_item *item; 400 enum cmd_retval retval; 401 u_int items = 0; 402 static u_int number; 403 404 if (TAILQ_EMPTY(queue)) { 405 log_debug("%s %s: empty", __func__, name); 406 return (0); 407 } 408 if (TAILQ_FIRST(queue)->flags & CMDQ_WAITING) { 409 log_debug("%s %s: waiting", __func__, name); 410 return (0); 411 } 412 413 log_debug("%s %s: enter", __func__, name); 414 for (;;) { 415 item = TAILQ_FIRST(queue); 416 if (item == NULL) 417 break; 418 log_debug("%s %s: %s (%d), flags %x", __func__, name, 419 item->name, item->type, item->flags); 420 421 /* 422 * Any item with the waiting flag set waits until an external 423 * event clears the flag (for example, a job - look at 424 * run-shell). 425 */ 426 if (item->flags & CMDQ_WAITING) 427 goto waiting; 428 429 /* 430 * Items are only fired once, once the fired flag is set, a 431 * waiting flag can only be cleared by an external event. 432 */ 433 if (~item->flags & CMDQ_FIRED) { 434 item->time = time(NULL); 435 item->number = ++number; 436 437 switch (item->type) { 438 case CMDQ_COMMAND: 439 retval = cmdq_fire_command(item); 440 441 /* 442 * If a command returns an error, remove any 443 * subsequent commands in the same group. 444 */ 445 if (retval == CMD_RETURN_ERROR) 446 cmdq_remove_group(item); 447 break; 448 case CMDQ_CALLBACK: 449 retval = cmdq_fire_callback(item); 450 break; 451 default: 452 retval = CMD_RETURN_ERROR; 453 break; 454 } 455 item->flags |= CMDQ_FIRED; 456 457 if (retval == CMD_RETURN_WAIT) { 458 item->flags |= CMDQ_WAITING; 459 goto waiting; 460 } 461 items++; 462 } 463 cmdq_remove(item); 464 } 465 466 log_debug("%s %s: exit (empty)", __func__, name); 467 return (items); 468 469 waiting: 470 log_debug("%s %s: exit (wait)", __func__, name); 471 return (items); 472 } 473 474 /* Print a guard line. */ 475 void 476 cmdq_guard(struct cmdq_item *item, const char *guard, int flags) 477 { 478 struct client *c = item->client; 479 480 if (c == NULL || !(c->flags & CLIENT_CONTROL)) 481 return; 482 483 evbuffer_add_printf(c->stdout_data, "%%%s %ld %u %d\n", guard, 484 (long)item->time, item->number, flags); 485 server_client_push_stdout(c); 486 } 487 488 /* Show message from command. */ 489 void 490 cmdq_print(struct cmdq_item *item, const char *fmt, ...) 491 { 492 struct client *c = item->client; 493 struct window_pane *wp; 494 struct window_mode_entry *wme; 495 va_list ap; 496 char *tmp, *msg; 497 498 va_start(ap, fmt); 499 500 if (c == NULL) 501 /* nothing */; 502 else if (c->session == NULL || (c->flags & CLIENT_CONTROL)) { 503 if (~c->flags & CLIENT_UTF8) { 504 xvasprintf(&tmp, fmt, ap); 505 msg = utf8_sanitize(tmp); 506 free(tmp); 507 evbuffer_add(c->stdout_data, msg, strlen(msg)); 508 free(msg); 509 } else 510 evbuffer_add_vprintf(c->stdout_data, fmt, ap); 511 evbuffer_add(c->stdout_data, "\n", 1); 512 server_client_push_stdout(c); 513 } else { 514 wp = c->session->curw->window->active; 515 wme = TAILQ_FIRST(&wp->modes); 516 if (wme == NULL || wme->mode != &window_view_mode) 517 window_pane_set_mode(wp, &window_view_mode, NULL, NULL); 518 window_copy_vadd(wp, fmt, ap); 519 } 520 521 va_end(ap); 522 } 523 524 /* Show error from command. */ 525 void 526 cmdq_error(struct cmdq_item *item, const char *fmt, ...) 527 { 528 struct client *c = item->client; 529 struct cmd *cmd = item->cmd; 530 va_list ap; 531 char *msg; 532 size_t msglen; 533 char *tmp; 534 535 va_start(ap, fmt); 536 msglen = xvasprintf(&msg, fmt, ap); 537 va_end(ap); 538 539 log_debug("%s: %s", __func__, msg); 540 541 if (c == NULL) 542 cfg_add_cause("%s:%u: %s", cmd->file, cmd->line, msg); 543 else if (c->session == NULL || (c->flags & CLIENT_CONTROL)) { 544 if (~c->flags & CLIENT_UTF8) { 545 tmp = msg; 546 msg = utf8_sanitize(tmp); 547 free(tmp); 548 msglen = strlen(msg); 549 } 550 evbuffer_add(c->stderr_data, msg, msglen); 551 evbuffer_add(c->stderr_data, "\n", 1); 552 server_client_push_stderr(c); 553 c->retval = 1; 554 } else { 555 *msg = toupper((u_char) *msg); 556 status_message_set(c, "%s", msg); 557 } 558 559 free(msg); 560 } 561