audiod_command.c

   1 /*
   2  * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod_command.c commands for para_audiod */
   8
   9 #include <regex.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include <stdbool.h>
  13
  14 #include "para.h"
  15 #include "audiod.cmdline.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "buffer_tree.h"
  20 #include "filter.h"
  21 #include "grab_client.h"
  22 #include "error.h"
  23 #include "audiod.h"
  24 #include "net.h"
  25 #include "daemon.h"
  26 #include "string.h"
  27 #include "write.h"
  28 #include "fd.h"
  29 #include "audiod_command_list.h"
  30
  31 extern char *stat_item_values[NUM_STAT_ITEMS];
  32
  33 /** Iterate over the array of all audiod commands. */
  34 #define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++)
  35
  36 /** The maximal number of simultaneous connections. */
  37 #define MAX_STAT_CLIENTS 50
  38
  39 /** Flags used for the stat command of para_audiod. */
  40 enum stat_client_flags {
  41         /** Enable parser-friendly output. */
  42         SCF_PARSER_FRIENDLY = 1,
  43 };
  44
  45 /**
  46  * Describes a status client of para_audiod.
  47  *
  48  * There's one such structure per audiod client that sent the 'stat' command.
  49  *
  50  * A status client is identified by its file descriptor.  para_audiod
  51  * keeps a list of connected status clients.
  52  */
  53 struct stat_client {
  54         /** The stat client's file descriptor. */
  55         int fd;
  56         /** Bitmask of those status items the client is interested in. */
  57         uint64_t item_mask;
  58         /** See \ref stat_client flags. s*/
  59         unsigned flags;
  60         /** Its entry in the list of stat clients. */
  61         struct list_head node;
  62 };
  63
  64 static INITIALIZED_LIST_HEAD(client_list);
  65 static int num_clients;
  66
  67 /** The list of all status items used by para_{server,audiod,gui}. */
  68 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  69
  70 static void dump_stat_client_list(void)
  71 {
  72         struct stat_client *sc;
  73
  74         list_for_each_entry(sc, &client_list, node)
  75                 PARA_INFO_LOG("stat client on fd %d\n", sc->fd);
  76 }
  77 /**
  78  * Add a status client to the list.
  79  *
  80  * \param fd The file descriptor of the client.
  81  * \param mask Bitfield of status items for this client.
  82  * \param parser_friendly Enable parser-friendly output mode.
  83  *
  84  * Only those status items having the bit set in \a mask will be
  85  * sent to the client.
  86  *
  87  * \return Positive value on success, or -E_TOO_MANY_CLIENTS if
  88  * the number of connected clients exceeds #MAX_STAT_CLIENTS.
  89  */
  90 static int stat_client_add(int fd, uint64_t mask, int parser_friendly)
  91 {
  92         struct stat_client *new_client;
  93
  94         if (num_clients >= MAX_STAT_CLIENTS) {
  95                 PARA_ERROR_LOG("maximal number of stat clients (%d) exceeded\n",
  96                         MAX_STAT_CLIENTS);
  97                 return -E_TOO_MANY_CLIENTS;
  98         }
  99         PARA_INFO_LOG("adding client on fd %d\n", fd);
 100         new_client = para_calloc(sizeof(struct stat_client));
 101         new_client->fd = fd;
 102         new_client->item_mask = mask;
 103         if (parser_friendly)
 104                 new_client->flags = SCF_PARSER_FRIENDLY;
 105         para_list_add(&new_client->node, &client_list);
 106         dump_stat_client_list();
 107         num_clients++;
 108         return 1;
 109 }
 110 /**
 111  * Write a message to all connected status clients.
 112  *
 113  * \param item_num The number of the status item of \a msg.
 114  *
 115  * On write errors, remove the status client from the client list and close its
 116  * file descriptor.
 117  */
 118 void stat_client_write_item(int item_num)
 119 {
 120         struct stat_client *sc, *tmp;
 121         struct para_buffer pb = {.flags = 0};
 122         struct para_buffer pfpb = {.flags = PBF_SIZE_PREFIX};
 123         const uint64_t one = 1;
 124
 125         list_for_each_entry_safe(sc, tmp, &client_list, node) {
 126                 int fd = sc->fd, ret;
 127
 128                 if (!((one << item_num) & sc->item_mask))
 129                         continue;
 130                 if (write_ok(fd) > 0) {
 131                         struct para_buffer *b =
 132                                 (sc->flags & SCF_PARSER_FRIENDLY)? &pfpb : &pb;
 133                         char *msg = stat_item_values[item_num];
 134                         if (!b->buf)
 135                                 WRITE_STATUS_ITEM(b, item_num, "%s\n",
 136                                         msg? msg : "");
 137                         ret = write(fd, b->buf, b->offset);
 138                         if (ret == b->offset)
 139                                 continue;
 140                 }
 141                 /* write error or fd not ready for writing */
 142                 close(fd);
 143                 num_clients--;
 144                 PARA_INFO_LOG("deleting client on fd %d\n", fd);
 145                 list_del(&sc->node);
 146                 free(sc);
 147                 dump_stat_client_list();
 148         }
 149         free(pb.buf);
 150         free(pfpb.buf);
 151 //      if (num_clients)
 152 //              PARA_DEBUG_LOG("%d client(s)\n", num_clients);
 153 }
 154
 155 /**
 156  * Check if string is a known status item.
 157  *
 158  * \param item Buffer containing the text to check.
 159  *
 160  * \return If \a item is a valid status item, the number of that status item is
 161  * returned. Otherwise, this function returns \p -E_UNKNOWN_STAT_ITEM.
 162  */
 163 static int stat_item_valid(const char *item)
 164 {
 165         int i;
 166         if (!item || !*item) {
 167                 PARA_ERROR_LOG("%s\n", "no item");
 168                 return -E_UNKNOWN_STAT_ITEM;
 169         }
 170         FOR_EACH_STATUS_ITEM(i)
 171                 if (!strcmp(status_item_list[i], item))
 172                         return i;
 173         PARA_ERROR_LOG("invalid stat item: %s\n", item);
 174         return -E_UNKNOWN_STAT_ITEM;
 175 }
 176
 177 static int client_write(int fd, const char *buf)
 178 {
 179         size_t len;
 180
 181         if (!buf)
 182                 return 0;
 183         len = strlen(buf);
 184         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 185 }
 186
 187 __malloc static char *audiod_status_string(void)
 188 {
 189         const char *status = (audiod_status == AUDIOD_ON)?
 190                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 191         return para_strdup(status);
 192 }
 193
 194 static int get_play_time_slot_num(void)
 195 {
 196         int i, oldest_slot = -1;
 197         struct timeval oldest_wstime = {0, 0};
 198
 199         FOR_EACH_SLOT(i) {
 200                 struct slot_info *s = &slot[i];
 201                 struct timeval wstime;
 202                 if (!s->wns)
 203                         continue;
 204                 btr_get_node_start(s->wns[0].btrn, &wstime);
 205                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 206                         continue;
 207                 oldest_wstime = wstime;
 208                 oldest_slot = i;
 209         }
 210         //PARA_CRIT_LOG("oldest slot: %d\n", oldest_slot);
 211         return oldest_slot;
 212 }
 213
 214 __malloc static char *decoder_flags(void)
 215 {
 216         int i;
 217         char flags[MAX_STREAM_SLOTS + 1];
 218
 219         FOR_EACH_SLOT(i) {
 220                 struct slot_info *s = &slot[i];
 221                 char flag = '0';
 222                 if (s->receiver_node)
 223                         flag += 1;
 224                 if (s->fns)
 225                         flag += 2;
 226                 if (s->wns)
 227                         flag += 4;
 228                 flags[i] = flag;
 229         }
 230         flags[MAX_STREAM_SLOTS] = '\0';
 231         return para_strdup(flags);
 232 }
 233
 234 static int dump_commands(int fd)
 235 {
 236         char *buf = para_strdup(""), *tmp = NULL;
 237         int i;
 238         ssize_t ret;
 239
 240         FOR_EACH_COMMAND(i) {
 241                 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
 242                         audiod_cmds[i].description);
 243                 free(buf);
 244                 buf = tmp;
 245         }
 246         ret = client_write(fd, buf);
 247         free(buf);
 248         return ret;
 249 }
 250
 251 /*
 252  * command handlers don't close their fd on errors (ret < 0) so that
 253  * its caller can send an error message. Otherwise (ret >= 0) it's up
 254  * to each individual command to close the fd if necessary.
 255  */
 256
 257 int com_help(int fd, int argc, char **argv)
 258 {
 259         int i, ret;
 260         char *buf;
 261         const char *dflt = "No such command. Available commands:\n";
 262
 263         if (argc < 2) {
 264                 ret = dump_commands(fd);
 265                 goto out;
 266         }
 267         FOR_EACH_COMMAND(i) {
 268                 if (strcmp(audiod_cmds[i].name, argv[1]))
 269                         continue;
 270                 buf = make_message(
 271                         "NAME\n\t%s -- %s\n"
 272                         "SYNOPSIS\n\tpara_audioc %s\n"
 273                         "DESCRIPTION\n%s\n",
 274                         argv[1],
 275                         audiod_cmds[i].description,
 276                         audiod_cmds[i].usage,
 277                         audiod_cmds[i].help
 278                 );
 279                 ret = client_write(fd, buf);
 280                 free(buf);
 281                 goto out;
 282         }
 283         ret = client_write(fd, dflt);
 284         if (ret > 0)
 285                 ret = dump_commands(fd);
 286 out:
 287         if (ret >= 0)
 288                 close(fd);
 289         return ret;
 290 }
 291
 292 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
 293 {
 294         char *tl = get_task_list();
 295         int ret = 1;
 296         if (tl)
 297                 ret = client_write(fd, tl);
 298         free(tl);
 299         if (ret > 0)
 300                 close(fd);
 301         return ret;
 302 }
 303
 304 int com_kill(int fd, int argc, char **argv)
 305 {
 306         int i, ret = 1;
 307         if (argc < 2)
 308                 return -E_AUDIOD_SYNTAX;
 309         for (i = 1; i < argc; i++) {
 310                 ret = kill_task(argv[i]);
 311                 if (ret < 0)
 312                         break;
 313         }
 314         if (ret > 0)
 315                 close(fd);
 316         return ret;
 317 }
 318
 319 int com_stat(int fd, int argc, char **argv)
 320 {
 321         int i, ret, parser_friendly = 0;
 322         uint64_t mask = 0;
 323         const uint64_t one = 1;
 324         struct para_buffer b = {.flags = 0};
 325
 326         for (i = 1; i < argc; i++) {
 327                 const char *arg = argv[i];
 328                 if (arg[0] != '-')
 329                         break;
 330                 if (!strcmp(arg, "--")) {
 331                         i++;
 332                         break;
 333                 }
 334                 if (!strncmp(arg, "-p", 2)) {
 335                         parser_friendly = 1;
 336                         b.flags = PBF_SIZE_PREFIX;
 337                         continue;
 338                 }
 339         }
 340         if (i >= argc)
 341                 mask--; /* set all bits */
 342         for (; i < argc; i++) {
 343                 ret = stat_item_valid(argv[i]);
 344                 if (ret < 0)
 345                         return ret;
 346                 mask |= (one << ret);
 347         }
 348         PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
 349         FOR_EACH_STATUS_ITEM(i) {
 350                 char *item = stat_item_values[i];
 351                 if (!((one << i) & mask))
 352                         continue;
 353                 WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
 354         }
 355         ret = client_write(fd, b.buf);
 356         if (ret >= 0)
 357                 ret = stat_client_add(fd, mask, parser_friendly);
 358         free(b.buf);
 359         return ret;
 360 }
 361
 362 int com_grab(int fd, int argc, char **argv)
 363 {
 364         return grab_client_new(fd, argc, argv);
 365 }
 366
 367 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
 368 {
 369         close(fd);
 370         clean_exit(EXIT_SUCCESS, "terminating on user request");
 371 }
 372
 373 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 374 {
 375         audiod_status = AUDIOD_ON;
 376         close(fd);
 377         return 1;
 378 }
 379
 380 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 381 {
 382         audiod_status = AUDIOD_OFF;
 383         close(fd);
 384         return 1;
 385 }
 386
 387 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 388 {
 389         audiod_status = AUDIOD_STANDBY;
 390         close(fd);
 391         return 1;
 392 }
 393
 394 int com_cycle(int fd, int argc, char **argv)
 395 {
 396         switch (audiod_status) {
 397                 case  AUDIOD_ON:
 398                         return com_sb(fd, argc, argv);
 399                         break;
 400                 case  AUDIOD_OFF:
 401                         return com_on(fd, argc, argv);
 402                         break;
 403                 case  AUDIOD_STANDBY:
 404                         return com_off(fd, argc, argv);
 405                         break;
 406         }
 407         close(fd);
 408         return 1;
 409 }
 410
 411 static int check_perms(uid_t uid)
 412 {
 413         int i;
 414
 415         if (!conf.user_allow_given)
 416                 return 1;
 417         for (i = 0; i < conf.user_allow_given; i++)
 418                 if (uid == conf.user_allow_arg[i])
 419                         return 1;
 420         return -E_UCRED_PERM;
 421 }
 422
 423 /**
 424  * Handle arriving connections on the local socket.
 425  *
 426  * \param accept_fd The fd to accept connections on.
 427  * \param rfds If \a accept_fd is not set in \a rfds, do nothing.
 428  *
 429  * This is called in each iteration of the select loop. If there is an incoming
 430  * connection on \a accept_fd, this function reads the command sent by the peer,
 431  * checks the connecting user's permissions by using unix socket credentials
 432  * (if supported by the OS) and calls the corresponding command handler if
 433  * permissions are OK.
 434  *
 435  * \return Positive on success, negative on errors, zero if there was no
 436  * connection to accept.
 437  *
 438  * \sa para_accept(), recv_cred_buffer()
 439  * */
 440 int handle_connect(int accept_fd, fd_set *rfds)
 441 {
 442         int i, argc, ret, clifd;
 443         char buf[MAXLINE], **argv = NULL;
 444         struct sockaddr_un unix_addr;
 445         uid_t uid;
 446
 447         ret = para_accept(accept_fd, rfds, &unix_addr, sizeof(struct sockaddr_un), &clifd);
 448         if (ret <= 0)
 449                 return ret;
 450         ret = recv_cred_buffer(clifd, buf, sizeof(buf) - 1);
 451         if (ret < 0)
 452                 goto out;
 453         uid = ret;
 454         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
 455         ret = check_perms(uid);
 456         if (ret < 0)
 457                 goto out;
 458         ret = create_argv(buf, "\n", &argv);
 459         if (ret < 0)
 460                 goto out;
 461         argc = ret;
 462         //PARA_INFO_LOG("argv[0]: %s, argc = %d\n", argv[0], argc);
 463         FOR_EACH_COMMAND(i) {
 464                 if (strcmp(audiod_cmds[i].name, argv[0]))
 465                         continue;
 466                 ret = audiod_cmds[i].handler(clifd, argc, argv);
 467                 goto out;
 468         }
 469         ret = -E_INVALID_AUDIOD_CMD;
 470 out:
 471         free_argv(argv);
 472         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
 473                 char *tmp = make_message("%s\n", para_strerror(-ret));
 474                 client_write(clifd, tmp);
 475                 free(tmp);
 476                 close(clifd);
 477         }
 478         return ret;
 479 }
 480
 481 /**
 482  * Send the current audiod status to all connected stat clients.
 483  */
 484 void audiod_status_dump(void)
 485 {
 486         int slot_num = get_play_time_slot_num();
 487         char *old, *new;
 488
 489         old = stat_item_values[SI_PLAY_TIME];
 490         new = get_time_string(slot_num);
 491         if (new) {
 492                 if (!old || strcmp(old, new)) {
 493                         free(old);
 494                         stat_item_values[SI_PLAY_TIME] = new;
 495                         stat_client_write_item(SI_PLAY_TIME);
 496                 } else
 497                         free(new);
 498         }
 499
 500         new = uptime_str();
 501         old = stat_item_values[SI_AUDIOD_UPTIME];
 502         if (!old || strcmp(old, new)) {
 503                 free(old);
 504                 stat_item_values[SI_AUDIOD_UPTIME] = new;
 505                 stat_client_write_item(SI_AUDIOD_UPTIME);
 506         } else
 507                 free(new);
 508
 509         old = stat_item_values[SI_AUDIOD_STATUS];
 510         new = audiod_status_string();
 511         if (!old || strcmp(old, new)) {
 512                 free(old);
 513                 stat_item_values[SI_AUDIOD_STATUS] = new;
 514                 stat_client_write_item(SI_AUDIOD_STATUS);
 515         } else
 516                 free(new);
 517
 518         old = stat_item_values[SI_DECODER_FLAGS];
 519         new = decoder_flags();
 520         if (!old || strcmp(old, new)) {
 521                 free(old);
 522                 stat_item_values[SI_DECODER_FLAGS] = new;
 523                 stat_client_write_item(SI_DECODER_FLAGS);
 524         } else
 525                 free(new);
 526 }
 527
 528 /**
 529  * Flush and send all status items.
 530  *
 531  * Send to  each connected client the full status item list
 532  * with empty values.
 533  */
 534 void clear_and_dump_items(void)
 535 {
 536         int i;
 537
 538         FOR_EACH_STATUS_ITEM(i) {
 539                 free(stat_item_values[i]);
 540                 stat_item_values[i] = NULL;
 541                 stat_client_write_item(i);
 542         }
 543 }