audiod_command.c

   1 /*
   2  * Copyright (C) 2005-2012 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
  12 #include "para.h"
  13 #include "audiod.cmdline.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "ggo.h"
  17 #include "buffer_tree.h"
  18 #include "filter.h"
  19 #include "grab_client.h"
  20 #include "error.h"
  21 #include "audiod.h"
  22 #include "net.h"
  23 #include "daemon.h"
  24 #include "string.h"
  25 #include "write.h"
  26 #include "fd.h"
  27 #include "audiod_command_list.h"
  28
  29 extern struct sched sched;
  30 extern char *stat_item_values[NUM_STAT_ITEMS];
  31
  32
  33 struct audiod_command audiod_cmds[] = {DEFINE_AUDIOD_CMD_ARRAY};
  34
  35 /** Iterate over the array of all audiod commands. */
  36 #define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++)
  37
  38 /** The maximal number of simultaneous connections. */
  39 #define MAX_STAT_CLIENTS 50
  40
  41 /** Flags used for the stat command of para_audiod. */
  42 enum stat_client_flags {
  43         /** Enable parser-friendly output. */
  44         SCF_PARSER_FRIENDLY = 1,
  45 };
  46
  47 /**
  48  * Describes a status client of para_audiod.
  49  *
  50  * There's one such structure per audiod client that sent the 'stat' command.
  51  *
  52  * A status client is identified by its file descriptor.  para_audiod
  53  * keeps a list of connected status clients.
  54  */
  55 struct stat_client {
  56         /** The stat client's file descriptor. */
  57         int fd;
  58         /** Bitmask of those status items the client is interested in. */
  59         uint64_t item_mask;
  60         /** See \ref stat_client flags. s*/
  61         unsigned flags;
  62         /** Its entry in the list of stat clients. */
  63         struct list_head node;
  64 };
  65
  66 static INITIALIZED_LIST_HEAD(client_list);
  67 static int num_clients;
  68
  69 /** The list of all status items used by para_{server,audiod,gui}. */
  70 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  71
  72 static void dump_stat_client_list(void)
  73 {
  74         struct stat_client *sc;
  75
  76         list_for_each_entry(sc, &client_list, node)
  77                 PARA_INFO_LOG("stat client on fd %d\n", sc->fd);
  78 }
  79 /**
  80  * Add a status client to the list.
  81  *
  82  * \param fd The file descriptor of the client.
  83  * \param mask Bitfield of status items for this client.
  84  * \param parser_friendly Enable parser-friendly output mode.
  85  *
  86  * Only those status items having the bit set in \a mask will be
  87  * sent to the client.
  88  *
  89  * \return Positive value on success, or -E_TOO_MANY_CLIENTS if
  90  * the number of connected clients exceeds #MAX_STAT_CLIENTS.
  91  */
  92 static int stat_client_add(int fd, uint64_t mask, int parser_friendly)
  93 {
  94         struct stat_client *new_client;
  95
  96         if (num_clients >= MAX_STAT_CLIENTS) {
  97                 PARA_ERROR_LOG("maximal number of stat clients (%d) exceeded\n",
  98                         MAX_STAT_CLIENTS);
  99                 return -E_TOO_MANY_CLIENTS;
 100         }
 101         PARA_INFO_LOG("adding client on fd %d\n", fd);
 102         new_client = para_calloc(sizeof(struct stat_client));
 103         new_client->fd = fd;
 104         new_client->item_mask = mask;
 105         if (parser_friendly)
 106                 new_client->flags = SCF_PARSER_FRIENDLY;
 107         para_list_add(&new_client->node, &client_list);
 108         dump_stat_client_list();
 109         num_clients++;
 110         return 1;
 111 }
 112 /**
 113  * Write a message to all connected status clients.
 114  *
 115  * \param item_num The number of the status item of \a msg.
 116  *
 117  * On write errors, remove the status client from the client list and close its
 118  * file descriptor.
 119  */
 120 void stat_client_write_item(int item_num)
 121 {
 122         struct stat_client *sc, *tmp;
 123         struct para_buffer pb = {.flags = 0};
 124         struct para_buffer pfpb = {.flags = PBF_SIZE_PREFIX};
 125         const uint64_t one = 1;
 126         char *msg = stat_item_values[item_num];
 127         struct para_buffer *b;
 128
 129         list_for_each_entry_safe(sc, tmp, &client_list, node) {
 130                 int fd = sc->fd, ret;
 131
 132                 if (!((one << item_num) & sc->item_mask))
 133                         continue;
 134                 b = (sc->flags & SCF_PARSER_FRIENDLY)? &pfpb : &pb;
 135                 if (!b->buf)
 136                         (void)WRITE_STATUS_ITEM(b, item_num, "%s\n",
 137                                 msg? msg : "");
 138                 ret = write(fd, b->buf, b->offset);
 139                 if (ret == b->offset)
 140                         continue;
 141                 /* write error or short write */
 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 }
 152
 153 /**
 154  * Check if string is a known status item.
 155  *
 156  * \param item Buffer containing the text to check.
 157  *
 158  * \return If \a item is a valid status item, the number of that status item is
 159  * returned. Otherwise, this function returns \p -E_UNKNOWN_STAT_ITEM.
 160  */
 161 static int stat_item_valid(const char *item)
 162 {
 163         int i;
 164         if (!item || !*item) {
 165                 PARA_ERROR_LOG("%s\n", "no item");
 166                 return -E_UNKNOWN_STAT_ITEM;
 167         }
 168         FOR_EACH_STATUS_ITEM(i)
 169                 if (!strcmp(status_item_list[i], item))
 170                         return i;
 171         PARA_ERROR_LOG("invalid stat item: %s\n", item);
 172         return -E_UNKNOWN_STAT_ITEM;
 173 }
 174
 175 static int client_write(int fd, const char *buf)
 176 {
 177         size_t len;
 178
 179         if (!buf)
 180                 return 0;
 181         len = strlen(buf);
 182         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 183 }
 184
 185 __malloc static char *audiod_status_string(void)
 186 {
 187         const char *status = (audiod_status == AUDIOD_ON)?
 188                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 189         return para_strdup(status);
 190 }
 191
 192 static int get_play_time_slot_num(void)
 193 {
 194         int i, oldest_slot = -1;
 195         struct timeval oldest_wstime = {0, 0};
 196
 197         FOR_EACH_SLOT(i) {
 198                 struct slot_info *s = &slot[i];
 199                 struct timeval wstime;
 200                 if (!s->wns || !s->wns[0].btrn)
 201                         continue;
 202                 btr_get_node_start(s->wns[0].btrn, &wstime);
 203                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 204                         continue;
 205                 oldest_wstime = wstime;
 206                 oldest_slot = i;
 207         }
 208         //PARA_CRIT_LOG("oldest slot: %d\n", oldest_slot);
 209         return oldest_slot;
 210 }
 211
 212 __malloc static char *decoder_flags(void)
 213 {
 214         int i;
 215         char flags[MAX_STREAM_SLOTS + 1];
 216
 217         FOR_EACH_SLOT(i) {
 218                 struct slot_info *s = &slot[i];
 219                 char flag = '0';
 220                 if (s->receiver_node)
 221                         flag += 1;
 222                 if (s->fns)
 223                         flag += 2;
 224                 if (s->wns)
 225                         flag += 4;
 226                 flags[i] = flag;
 227         }
 228         flags[MAX_STREAM_SLOTS] = '\0';
 229         return para_strdup(flags);
 230 }
 231
 232 static int dump_commands(int fd)
 233 {
 234         char *buf = para_strdup(""), *tmp = NULL;
 235         int i;
 236         ssize_t ret;
 237
 238         FOR_EACH_COMMAND(i) {
 239                 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
 240                         audiod_cmds[i].description);
 241                 free(buf);
 242                 buf = tmp;
 243         }
 244         ret = client_write(fd, buf);
 245         free(buf);
 246         return ret;
 247 }
 248
 249 /*
 250  * command handlers don't close their fd on errors (ret < 0) so that
 251  * its caller can send an error message. Otherwise (ret >= 0) it's up
 252  * to each individual command to close the fd if necessary.
 253  */
 254
 255 static int com_help(int fd, int argc, char **argv)
 256 {
 257         int i, ret;
 258         char *buf;
 259         const char *dflt = "No such command. Available commands:\n";
 260
 261         if (argc < 2) {
 262                 ret = dump_commands(fd);
 263                 goto out;
 264         }
 265         FOR_EACH_COMMAND(i) {
 266                 if (strcmp(audiod_cmds[i].name, argv[1]))
 267                         continue;
 268                 buf = make_message(
 269                         "NAME\n\t%s -- %s\n"
 270                         "SYNOPSIS\n\tpara_audioc %s\n"
 271                         "DESCRIPTION\n%s\n",
 272                         argv[1],
 273                         audiod_cmds[i].description,
 274                         audiod_cmds[i].usage,
 275                         audiod_cmds[i].help
 276                 );
 277                 ret = client_write(fd, buf);
 278                 free(buf);
 279                 goto out;
 280         }
 281         ret = client_write(fd, dflt);
 282         if (ret > 0)
 283                 ret = dump_commands(fd);
 284 out:
 285         if (ret >= 0)
 286                 close(fd);
 287         return ret;
 288 }
 289
 290 static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
 291 {
 292         char *tl = get_task_list(&sched);
 293         int ret = 1;
 294         if (tl)
 295                 ret = client_write(fd, tl);
 296         free(tl);
 297         if (ret > 0)
 298                 close(fd);
 299         return ret;
 300 }
 301
 302 static int com_stat(int fd, int argc, char **argv)
 303 {
 304         int i, ret, parser_friendly = 0;
 305         uint64_t mask = 0;
 306         const uint64_t one = 1;
 307         struct para_buffer b = {.flags = 0};
 308
 309         ret = mark_fd_nonblocking(fd);
 310         if (ret < 0)
 311                 return ret;
 312         for (i = 1; i < argc; i++) {
 313                 const char *arg = argv[i];
 314                 if (arg[0] != '-')
 315                         break;
 316                 if (!strcmp(arg, "--")) {
 317                         i++;
 318                         break;
 319                 }
 320                 if (!strncmp(arg, "-p", 2)) {
 321                         parser_friendly = 1;
 322                         b.flags = PBF_SIZE_PREFIX;
 323                         continue;
 324                 }
 325         }
 326         if (i >= argc)
 327                 mask--; /* set all bits */
 328         for (; i < argc; i++) {
 329                 ret = stat_item_valid(argv[i]);
 330                 if (ret < 0)
 331                         return ret;
 332                 mask |= (one << ret);
 333         }
 334         PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
 335         FOR_EACH_STATUS_ITEM(i) {
 336                 char *item = stat_item_values[i];
 337                 if (!((one << i) & mask))
 338                         continue;
 339                 (void)WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
 340         }
 341         ret = client_write(fd, b.buf);
 342         if (ret >= 0)
 343                 ret = stat_client_add(fd, mask, parser_friendly);
 344         free(b.buf);
 345         return ret;
 346 }
 347
 348 static int com_grab(int fd, int argc, char **argv)
 349 {
 350         return grab_client_new(fd, argc, argv, &sched);
 351 }
 352
 353 __noreturn static int com_term(int fd, __a_unused int argc, __a_unused char **argv)
 354 {
 355         close(fd);
 356         clean_exit(EXIT_SUCCESS, "terminating on user request");
 357 }
 358
 359 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 360 {
 361         audiod_status = AUDIOD_ON;
 362         close(fd);
 363         return 1;
 364 }
 365
 366 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 367 {
 368         audiod_status = AUDIOD_OFF;
 369         close(fd);
 370         return 1;
 371 }
 372
 373 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 374 {
 375         audiod_status = AUDIOD_STANDBY;
 376         close(fd);
 377         return 1;
 378 }
 379
 380 static int com_cycle(int fd, int argc, char **argv)
 381 {
 382         switch (audiod_status) {
 383                 case  AUDIOD_ON:
 384                         return com_sb(fd, argc, argv);
 385                         break;
 386                 case  AUDIOD_OFF:
 387                         return com_on(fd, argc, argv);
 388                         break;
 389                 case  AUDIOD_STANDBY:
 390                         return com_off(fd, argc, argv);
 391                         break;
 392         }
 393         close(fd);
 394         return 1;
 395 }
 396
 397 static int check_perms(uid_t uid)
 398 {
 399         int i;
 400
 401         if (!conf.user_allow_given)
 402                 return 1;
 403         for (i = 0; i < conf.user_allow_given; i++)
 404                 if (uid == conf.user_allow_arg[i])
 405                         return 1;
 406         return -E_UCRED_PERM;
 407 }
 408
 409 /**
 410  * Handle arriving connections on the local socket.
 411  *
 412  * \param accept_fd The fd to accept connections on.
 413  * \param rfds If \a accept_fd is not set in \a rfds, do nothing.
 414  *
 415  * This is called in each iteration of the select loop. If there is an incoming
 416  * connection on \a accept_fd, this function reads the command sent by the peer,
 417  * checks the connecting user's permissions by using unix socket credentials
 418  * (if supported by the OS) and calls the corresponding command handler if
 419  * permissions are OK.
 420  *
 421  * \return Positive on success, negative on errors, zero if there was no
 422  * connection to accept.
 423  *
 424  * \sa para_accept(), recv_cred_buffer()
 425  * */
 426 int handle_connect(int accept_fd, fd_set *rfds)
 427 {
 428         int i, argc, ret, clifd;
 429         char buf[MAXLINE], **argv = NULL;
 430         struct sockaddr_un unix_addr;
 431         uid_t uid;
 432
 433         ret = para_accept(accept_fd, rfds, &unix_addr, sizeof(struct sockaddr_un), &clifd);
 434         if (ret <= 0)
 435                 return ret;
 436         ret = recv_cred_buffer(clifd, buf, sizeof(buf) - 1);
 437         if (ret < 0)
 438                 goto out;
 439         uid = ret;
 440         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
 441         ret = check_perms(uid);
 442         if (ret < 0)
 443                 goto out;
 444         ret = create_argv(buf, "\n", &argv);
 445         if (ret < 0)
 446                 goto out;
 447         argc = ret;
 448         //PARA_INFO_LOG("argv[0]: %s, argc = %d\n", argv[0], argc);
 449         FOR_EACH_COMMAND(i) {
 450                 if (strcmp(audiod_cmds[i].name, argv[0]))
 451                         continue;
 452                 ret = audiod_cmds[i].handler(clifd, argc, argv);
 453                 goto out;
 454         }
 455         ret = -E_INVALID_AUDIOD_CMD;
 456 out:
 457         free_argv(argv);
 458         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
 459                 char *tmp = make_message("%s\n", para_strerror(-ret));
 460                 client_write(clifd, tmp);
 461                 free(tmp);
 462                 close(clifd);
 463         }
 464         return ret;
 465 }
 466
 467 /**
 468  * Send the current audiod status to all connected stat clients.
 469  */
 470 void audiod_status_dump(void)
 471 {
 472         int slot_num = get_play_time_slot_num();
 473         char *old, *new;
 474
 475         old = stat_item_values[SI_PLAY_TIME];
 476         new = get_time_string(slot_num);
 477         if (new) {
 478                 if (!old || strcmp(old, new)) {
 479                         free(old);
 480                         stat_item_values[SI_PLAY_TIME] = new;
 481                         stat_client_write_item(SI_PLAY_TIME);
 482                 } else
 483                         free(new);
 484         }
 485
 486         new = get_server_uptime_str(now);
 487         old = stat_item_values[SI_AUDIOD_UPTIME];
 488         if (!old || strcmp(old, new)) {
 489                 free(old);
 490                 stat_item_values[SI_AUDIOD_UPTIME] = new;
 491                 stat_client_write_item(SI_AUDIOD_UPTIME);
 492         } else
 493                 free(new);
 494
 495         old = stat_item_values[SI_AUDIOD_STATUS];
 496         new = audiod_status_string();
 497         if (!old || strcmp(old, new)) {
 498                 free(old);
 499                 stat_item_values[SI_AUDIOD_STATUS] = new;
 500                 stat_client_write_item(SI_AUDIOD_STATUS);
 501         } else
 502                 free(new);
 503
 504         old = stat_item_values[SI_DECODER_FLAGS];
 505         new = decoder_flags();
 506         if (!old || strcmp(old, new)) {
 507                 free(old);
 508                 stat_item_values[SI_DECODER_FLAGS] = new;
 509                 stat_client_write_item(SI_DECODER_FLAGS);
 510         } else
 511                 free(new);
 512 }
 513
 514 /**
 515  * Flush and send all status items.
 516  *
 517  * Send to  each connected client the full status item list
 518  * with empty values.
 519  */
 520 void clear_and_dump_items(void)
 521 {
 522         int i;
 523
 524         FOR_EACH_STATUS_ITEM(i) {
 525                 free(stat_item_values[i]);
 526                 stat_item_values[i] = NULL;
 527                 stat_client_write_item(i);
 528         }
 529 }