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