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, int argc, 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         FOR_EACH_STATUS_ITEM(i) {
 187                 char *tmp, *v;
 188                 if (!((one << i) & mask))
 189                         continue;
 190                 v = stat_item_values[i];
 191                 if (!v)
 192                         continue;
 193                 tmp = make_message("%s%s%s", buf? buf: "", v,
 194                         strrchr(v, '\n')? "" : "\n");
 195                 free(buf);
 196                 buf = tmp;
 197         }
 198         ret = client_write(fd, buf);
 199 out:
 200         if (ret > 0)
 201                 ret = stat_client_add(fd, mask);
 202         free(buf);
 203         return ret;
 204 }
 205
 206 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 207 {
 208         int i;
 209
 210         FOR_EACH_SLOT(i) {
 211                 struct slot_info *s = &slot[i];
 212                 if (s->format < 0 || !s->fc)
 213                         continue;
 214                 if (slot_num >= 0 && slot_num != i)
 215                         continue;
 216                 if (format >= 0 && s->format != format)
 217                         continue;
 218                 if (num_filters(i) <= filternum)
 219                         continue;
 220                 /* success */
 221                 return  s->fc->filter_nodes + filternum;
 222         }
 223         return NULL;
 224 }
 225
 226 int com_grab(int fd, char *cmdline)
 227 {
 228         struct grab_client *gc;
 229         struct filter_node *fn;
 230         int i, err;
 231         char *msg;
 232
 233         gc = grab_client_new(fd, cmdline, &err);
 234         if (!gc)
 235                 goto err_out;
 236         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
 237         if (fn)
 238                 activate_grab_client(gc, fn);
 239         return 1;
 240 err_out:
 241         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
 242                 return err;
 243         if (err == -E_GC_HELP_GIVEN) {
 244                 msg = make_message("%s\n\n", grab_client_args_info_usage);
 245                 for (i = 0; grab_client_args_info_help[i]; i++) {
 246                         char *tmp = make_message("%s%s\n", msg,
 247                                 grab_client_args_info_help[i]);
 248                         free(msg);
 249                         msg = tmp;
 250                 }
 251         } else
 252                 msg = make_message("%s %s\n",
 253                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
 254                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
 255         err = client_write(fd, msg);
 256         free(msg);
 257         if (err < 0)
 258                 return err;
 259         close(fd);
 260         return 1;
 261 }
 262
 263 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
 264 {
 265         close(fd);
 266         clean_exit(EXIT_SUCCESS, "terminating on user request");
 267 }
 268
 269 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 270 {
 271         audiod_status = AUDIOD_ON;
 272         close(fd);
 273         return 1;
 274 }
 275
 276 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 277 {
 278         audiod_status = AUDIOD_OFF;
 279         close(fd);
 280         return 1;
 281 }
 282
 283 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 284 {
 285         audiod_status = AUDIOD_STANDBY;
 286         close(fd);
 287         return 1;
 288 }
 289
 290 int com_cycle(int fd, int argc, char **argv)
 291 {
 292         switch (audiod_status) {
 293                 case  AUDIOD_ON:
 294                         return com_sb(fd, argc, argv);
 295                         break;
 296                 case  AUDIOD_OFF:
 297                         return com_on(fd, argc, argv);
 298                         break;
 299                 case  AUDIOD_STANDBY:
 300                         return com_off(fd, argc, argv);
 301                         break;
 302         }
 303         close(fd);
 304         return 1;
 305 }
 306
 307 static int check_perms(uid_t uid)
 308 {
 309         int i;
 310
 311         if (!conf.user_allow_given)
 312                 return 1;
 313         for (i = 0; i < conf.user_allow_given; i++)
 314                 if (uid == conf.user_allow_arg[i])
 315                         return 1;
 316         return -E_UCRED_PERM;
 317 }
 318
 319 /**
 320  * handle arriving connections on the local socket
 321  *
 322  * \param accept_fd the fd to call accept() on
 323  *
 324  * This is called whenever para_audiod's main task detects an incoming
 325  * connection by the readability of \a accept_fd. This function reads the
 326  * command sent by the peer, checks the connecting user's permissions by using
 327  * unix socket credentials (if supported by the OS) and calls the corresponding
 328  * command handler if permissions are OK.
 329  *
 330  * \return positive on success, negative on errors
 331  *
 332  * \sa para_accept(), recv_cred_buffer()
 333  * */
 334 int handle_connect(int accept_fd)
 335 {
 336         int i, argc, ret, clifd = -1;
 337         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
 338         struct sockaddr_un unix_addr;
 339         uid_t uid;
 340
 341         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
 342         if (ret < 0)
 343                 goto out;
 344         clifd = ret;
 345         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
 346         if (ret < 0)
 347                 goto out;
 348         uid = ret;
 349         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
 350         ret = check_perms(uid);
 351         if (ret < 0)
 352                 goto out;
 353         cmd = para_strdup(buf);
 354         p = strchr(cmd, '\n');
 355         if (!p)
 356                 p = "";
 357         else {
 358                 *p = '\0';
 359                 p++;
 360         }
 361         for (i = 0; audiod_cmds[i].name; i++) {
 362                 int j;
 363                 if (strcmp(audiod_cmds[i].name, cmd))
 364                         continue;
 365                 if (audiod_cmds[i].handler) {
 366                         argc = split_args(buf, &argv, "\n");
 367                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
 368                         ret = audiod_cmds[i].handler(clifd, argc, argv);
 369                         goto out;
 370                 }
 371                 for (j = 0; p[j]; j++)
 372                         if (p[j] == '\n')
 373                                 p[j] = ' ';
 374                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
 375                 ret = audiod_cmds[i].line_handler(clifd, p);
 376                 goto out;
 377         }
 378         ret = -E_INVALID_AUDIOD_CMD;
 379 out:
 380         free(cmd);
 381         free(buf);
 382         free(argv);
 383         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
 384                 char *tmp = make_message("%s\n", para_strerror(-ret));
 385                 client_write(clifd, tmp);
 386                 free(tmp);
 387                 close(clifd);
 388         }
 389         return ret;
 390 }
 391 /**
 392  * send the current audiod status to all connected stat clients
 393  */
 394 void audiod_status_dump(void)
 395 {
 396         int slot_num = get_play_time_slot_num();
 397         char *old, *new, *tmp;
 398
 399         old = stat_item_values[SI_PLAY_TIME];
 400         new = get_time_string(slot_num);
 401         if (new) {
 402                 if (!old || strcmp(old, new)) {
 403                         free(old);
 404                         stat_client_write(new, SI_PLAY_TIME);
 405                         stat_item_values[SI_PLAY_TIME] = new;
 406                 } else
 407                         free(new);
 408         }
 409
 410         tmp = uptime_str();
 411         new = make_message("%s: %s\n", status_item_list[SI_AUDIOD_UPTIME],
 412                 tmp);
 413         free(tmp);
 414         old = stat_item_values[SI_AUDIOD_UPTIME];
 415         if (!old || strcmp(old, new)) {
 416                 free(old);
 417                 stat_client_write(new, SI_AUDIOD_UPTIME);
 418                 stat_item_values[SI_AUDIOD_UPTIME] = new;
 419         } else
 420                 free(new);
 421
 422         old = stat_item_values[SI_AUDIOD_STATUS];
 423         new = audiod_status_string();
 424         if (!old || strcmp(old, new)) {
 425                 free(old);
 426                 stat_client_write(new, SI_AUDIOD_STATUS);
 427                 stat_item_values[SI_AUDIOD_STATUS] = new;
 428         } else
 429                 free(new);
 430
 431         old = stat_item_values[SI_DECODER_FLAGS];
 432         new = decoder_flags();
 433         if (!old || strcmp(old, new)) {
 434                 free(old);
 435                 stat_client_write(new, SI_DECODER_FLAGS);
 436                 stat_item_values[SI_DECODER_FLAGS] = new;
 437         } else
 438                 free(new);
 439 }
 440
 441 /**
 442  * send empty status list
 443  *
 444  * Send to  each connected client the full status item list
 445  * with empty values.
 446  */
 447 void dump_empty_status(void)
 448 {
 449         int i;
 450
 451         FOR_EACH_STATUS_ITEM(i) {
 452                 char *tmp = make_message("%s:\n", status_item_list[i]);
 453                 stat_client_write(tmp, i);
 454                 free(tmp);
 455                 free(stat_item_values[i]);
 456                 stat_item_values[i] = NULL;
 457         }
 458 }