audiod_command.c

   1 /*
   2  * Copyright (C) 2005-2009 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 <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "audiod.cmdline.h"
  14 #include "list.h"
  15 #include "close_on_fork.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "filter.h"
  19 #include "grab_client.cmdline.h"
  20 #include "grab_client.h"
  21
  22 #include "error.h"
  23 #include "audiod.h"
  24 #include "net.h"
  25 #include "daemon.h"
  26 #include "string.h"
  27 #include "fd.h"
  28 #include "audiod_command_list.h"
  29
  30 extern char *stat_item_values[NUM_STAT_ITEMS];
  31
  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 static int client_write(int fd, const char *buf)
  37 {
  38         size_t len = strlen(buf);
  39         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
  40 }
  41
  42 __malloc static char *audiod_status_string(void)
  43 {
  44         const char *status = (audiod_status == AUDIOD_ON)?
  45                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
  46         return make_message("%s: %s\n", status_item_list[SI_AUDIOD_STATUS], status);
  47 }
  48
  49 static int get_play_time_slot_num(void)
  50 {
  51         int i, oldest = -1;
  52
  53         FOR_EACH_SLOT(i) {
  54                 struct slot_info *s = &slot[i];
  55                 if (!s->wng)
  56                         continue;
  57                 if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
  58                                 NULL) > 0)
  59                         continue;
  60                 oldest = i;
  61         }
  62         return oldest;
  63 }
  64
  65 __malloc static char *decoder_flags(void)
  66 {
  67         int i;
  68         char flags[MAX_STREAM_SLOTS + 1];
  69
  70         FOR_EACH_SLOT(i) {
  71                 struct slot_info *s = &slot[i];
  72                 char flag = '0';
  73                 if (s->receiver_node)
  74                         flag += 1;
  75                 if (s->wng)
  76                         flag += 2;
  77                 flags[i] = flag;
  78         }
  79         flags[MAX_STREAM_SLOTS] = '\0';
  80         return make_message("%s: %s\n", status_item_list[SI_DECODER_FLAGS],
  81                 flags);
  82 }
  83
  84 static int dump_commands(int fd)
  85 {
  86         char *buf = para_strdup(""), *tmp = NULL;
  87         int i;
  88         ssize_t ret;
  89
  90         FOR_EACH_COMMAND(i) {
  91                 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
  92                         audiod_cmds[i].description);
  93                 free(buf);
  94                 buf = tmp;
  95         }
  96         ret = client_write(fd, buf);
  97         free(buf);
  98         return ret;
  99 }
 100
 101 /*
 102  * command handlers don't close their fd on errors (ret < 0) so that
 103  * its caller can send an error message. Otherwise (ret >= 0) it's up
 104  * to each individual command to close the fd if necessary.
 105  */
 106
 107 int com_help(int fd, int argc, char **argv)
 108 {
 109         int i, ret;
 110         char *buf;
 111         const char *dflt = "No such command. Available commands:\n";
 112
 113         if (argc < 2) {
 114                 ret = dump_commands(fd);
 115                 goto out;
 116         }
 117         FOR_EACH_COMMAND(i) {
 118                 if (strcmp(audiod_cmds[i].name, argv[1]))
 119                         continue;
 120                 buf = make_message(
 121                         "NAME\n\t%s -- %s\n"
 122                         "SYNOPSIS\n\tpara_audioc %s\n"
 123                         "DESCRIPTION\n%s\n",
 124                         argv[1],
 125                         audiod_cmds[i].description,
 126                         audiod_cmds[i].usage,
 127                         audiod_cmds[i].help
 128                 );
 129                 ret = client_write(fd, buf);
 130                 free(buf);
 131                 goto out;
 132         }
 133         ret = client_write(fd, dflt);
 134         if (ret > 0)
 135                 ret = dump_commands(fd);
 136 out:
 137         if (ret >= 0)
 138                 close(fd);
 139         return ret;
 140 }
 141
 142 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
 143 {
 144         char *tl = get_task_list();
 145         int ret = 1;
 146         if (tl)
 147                 ret = client_write(fd, tl);
 148         free(tl);
 149         if (ret > 0)
 150                 close(fd);
 151         return ret;
 152 }
 153
 154 int com_kill(int fd, int argc, char **argv)
 155 {
 156         int i, ret = 1;
 157         if (argc < 2)
 158                 return -E_AUDIOD_SYNTAX;
 159         for (i = 1; i < argc; i++) {
 160                 ret = kill_task(argv[i]);
 161                 if (ret < 0)
 162                         break;
 163         }
 164         if (ret > 0)
 165                 close(fd);
 166         return ret;
 167 }
 168
 169 int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
 170 {
 171         int i, ret;
 172         char *buf = NULL;
 173         uint64_t mask = 0;
 174         const uint64_t one = 1;
 175
 176         if (argc > 1) {
 177                 for (i = 1; i < argc; i++) {
 178                         ret = stat_item_valid(argv[i]);
 179                         if (ret < 0)
 180                                 return ret;
 181                         mask |= (one << ret);
 182                 }
 183         } else
 184                 mask--; /* set all bits */
 185         PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
 186         if (mask & (one << SI_PLAY_TIME)) {
 187                 int slot_num = get_play_time_slot_num();
 188                 char *ts = get_time_string(slot_num);
 189                 if (ts) {
 190                         ret = client_write(fd, ts);
 191                         if (ret < 0)
 192                                 goto out;
 193                         free(ts);
 194                 }
 195         }
 196         if (mask & (one << SI_AUDIOD_UPTIME)) {
 197                 char *tmp, *us = uptime_str();
 198                 tmp = make_message("%s: %s\n",
 199                         status_item_list[SI_AUDIOD_UPTIME], us);
 200                 free(us);
 201                 ret = client_write(fd, tmp);
 202                 if (ret < 0)
 203                         goto out;
 204                 free(tmp);
 205         }
 206         if (mask & (one << SI_AUDIOD_STATUS)) {
 207                 char *s = audiod_status_string();
 208                 ret = client_write(fd, s);
 209                 if (ret < 0)
 210                         goto out;
 211                 free(s);
 212         }
 213         if (mask & (one << SI_DECODER_FLAGS)) {
 214                 char *df = decoder_flags();
 215                 ret = client_write(fd, df);
 216                 if (ret < 0)
 217                         goto out;
 218                 free(df);
 219         }
 220         FOR_EACH_STATUS_ITEM(i) {
 221                 char *tmp, *v;
 222                 if (!((one << i) & mask))
 223                         continue;
 224                 v = stat_item_values[i];
 225                 tmp = make_message("%s%s%s", buf? buf: "",
 226                         v? v : "", v? "\n" : "");
 227                 free(buf);
 228                 buf = tmp;
 229         }
 230         ret = client_write(fd, buf);
 231 out:
 232         if (ret > 0)
 233                 ret = stat_client_add(fd, mask);
 234         free(buf);
 235         return ret;
 236 }
 237
 238 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 239 {
 240         int i;
 241
 242         FOR_EACH_SLOT(i) {
 243                 struct slot_info *s = &slot[i];
 244                 if (s->format < 0 || !s->fc)
 245                         continue;
 246                 if (slot_num >= 0 && slot_num != i)
 247                         continue;
 248                 if (format >= 0 && s->format != format)
 249                         continue;
 250                 if (num_filters(i) <= filternum)
 251                         continue;
 252                 /* success */
 253                 return  s->fc->filter_nodes + filternum;
 254         }
 255         return NULL;
 256 }
 257
 258 int com_grab(int fd, char *cmdline)
 259 {
 260         struct grab_client *gc;
 261         struct filter_node *fn;
 262         int i, err;
 263         char *msg;
 264
 265         gc = grab_client_new(fd, cmdline, &err);
 266         if (!gc)
 267                 goto err_out;
 268         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
 269         if (fn)
 270                 activate_grab_client(gc, fn);
 271         return 1;
 272 err_out:
 273         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
 274                 return err;
 275         if (err == -E_GC_HELP_GIVEN) {
 276                 msg = make_message("%s\n\n", grab_client_args_info_usage);
 277                 for (i = 0; grab_client_args_info_help[i]; i++) {
 278                         char *tmp = make_message("%s%s\n", msg,
 279                                 grab_client_args_info_help[i]);
 280                         free(msg);
 281                         msg = tmp;
 282                 }
 283         } else
 284                 msg = make_message("%s %s\n",
 285                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
 286                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
 287         err = client_write(fd, msg);
 288         free(msg);
 289         if (err < 0)
 290                 return err;
 291         close(fd);
 292         return 1;
 293 }
 294
 295 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
 296 {
 297         close(fd);
 298         clean_exit(EXIT_SUCCESS, "terminating on user request");
 299 }
 300
 301 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 302 {
 303         audiod_status = AUDIOD_ON;
 304         close(fd);
 305         return 1;
 306 }
 307
 308 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 309 {
 310         audiod_status = AUDIOD_OFF;
 311         close(fd);
 312         return 1;
 313 }
 314
 315 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 316 {
 317         audiod_status = AUDIOD_STANDBY;
 318         close(fd);
 319         return 1;
 320 }
 321
 322 int com_cycle(int fd, int argc, char **argv)
 323 {
 324         switch (audiod_status) {
 325                 case  AUDIOD_ON:
 326                         return com_sb(fd, argc, argv);
 327                         break;
 328                 case  AUDIOD_OFF:
 329                         return com_on(fd, argc, argv);
 330                         break;
 331                 case  AUDIOD_STANDBY:
 332                         return com_off(fd, argc, argv);
 333                         break;
 334         }
 335         close(fd);
 336         return 1;
 337 }
 338
 339 static int check_perms(uid_t uid)
 340 {
 341         int i;
 342
 343         if (!conf.user_allow_given)
 344                 return 1;
 345         for (i = 0; i < conf.user_allow_given; i++)
 346                 if (uid == conf.user_allow_arg[i])
 347                         return 1;
 348         return -E_UCRED_PERM;
 349 }
 350
 351 /**
 352  * handle arriving connections on the local socket
 353  *
 354  * \param accept_fd the fd to call accept() on
 355  *
 356  * This is called whenever para_audiod's main task detects an incoming
 357  * connection by the readability of \a accept_fd. This function reads the
 358  * command sent by the peer, checks the connecting user's permissions by using
 359  * unix socket credentials (if supported by the OS) and calls the corresponding
 360  * command handler if permissions are OK.
 361  *
 362  * \return positive on success, negative on errors
 363  *
 364  * \sa para_accept(), recv_cred_buffer()
 365  * */
 366 int handle_connect(int accept_fd)
 367 {
 368         int i, argc, ret, clifd = -1;
 369         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
 370         struct sockaddr_un unix_addr;
 371         uid_t uid;
 372
 373         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
 374         if (ret < 0)
 375                 goto out;
 376         clifd = ret;
 377         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
 378         if (ret < 0)
 379                 goto out;
 380         uid = ret;
 381         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
 382         ret = check_perms(uid);
 383         if (ret < 0)
 384                 goto out;
 385         cmd = para_strdup(buf);
 386         p = strchr(cmd, '\n');
 387         if (!p)
 388                 p = "";
 389         else {
 390                 *p = '\0';
 391                 p++;
 392         }
 393         for (i = 0; audiod_cmds[i].name; i++) {
 394                 int j;
 395                 if (strcmp(audiod_cmds[i].name, cmd))
 396                         continue;
 397                 if (audiod_cmds[i].handler) {
 398                         argc = split_args(buf, &argv, "\n");
 399                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
 400                         ret = audiod_cmds[i].handler(clifd, argc, argv);
 401                         goto out;
 402                 }
 403                 for (j = 0; p[j]; j++)
 404                         if (p[j] == '\n')
 405                                 p[j] = ' ';
 406                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
 407                 ret = audiod_cmds[i].line_handler(clifd, p);
 408                 goto out;
 409         }
 410         ret = -E_INVALID_AUDIOD_CMD;
 411 out:
 412         free(cmd);
 413         free(buf);
 414         free(argv);
 415         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
 416                 char *tmp = make_message("%s\n", para_strerror(-ret));
 417                 client_write(clifd, tmp);
 418                 free(tmp);
 419                 close(clifd);
 420         }
 421         return ret;
 422 }
 423 /**
 424  * send the current audiod status to all connected stat clients
 425  */
 426 void audiod_status_dump(void)
 427 {
 428         int slot_num = get_play_time_slot_num();
 429         char *old, *new, *tmp;
 430
 431         old = stat_item_values[SI_PLAY_TIME];
 432         new = get_time_string(slot_num);
 433         if (new) {
 434                 if (!old || strcmp(old, new)) {
 435                         free(old);
 436                         stat_client_write(new, SI_PLAY_TIME);
 437                         stat_item_values[SI_PLAY_TIME] = new;
 438                 } else
 439                         free(new);
 440         }
 441
 442         new = uptime_str();
 443         old = stat_item_values[SI_AUDIOD_UPTIME];
 444         if (!old || strcmp(old, new)) {
 445                 free(old);
 446                 tmp = make_message("%s: %s\n",
 447                         status_item_list[SI_AUDIOD_UPTIME], new);
 448                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 449                 free(tmp);
 450                 stat_item_values[SI_AUDIOD_UPTIME] = new;
 451         } else
 452                 free(new);
 453
 454         old = stat_item_values[SI_AUDIOD_STATUS];
 455         new = audiod_status_string();
 456         if (!old || strcmp(old, new)) {
 457                 free(old);
 458                 stat_client_write(new, SI_AUDIOD_STATUS);
 459                 stat_item_values[SI_AUDIOD_STATUS] = new;
 460         } else
 461                 free(new);
 462
 463         old = stat_item_values[SI_DECODER_FLAGS];
 464         new = decoder_flags();
 465         if (!old || strcmp(old, new)) {
 466                 free(old);
 467                 stat_client_write(new, SI_DECODER_FLAGS);
 468                 stat_item_values[SI_DECODER_FLAGS] = new;
 469         } else
 470                 free(new);
 471 }
 472
 473 /**
 474  * send empty status list
 475  *
 476  * Send to  each connected client the full status item list
 477  * with empty values.
 478  */
 479 void dump_empty_status(void)
 480 {
 481         int i;
 482
 483         FOR_EACH_STATUS_ITEM(i) {
 484                 char *tmp = make_message("%s:\n", status_item_list[i]);
 485                 stat_client_write(tmp, i);
 486                 free(tmp);
 487                 free(stat_item_values[i]);
 488                 stat_item_values[i] = NULL;
 489         }
 490 }