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;
  39
  40         if (!buf)
  41                 return 0;
  42         len = strlen(buf);
  43         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
  44 }
  45
  46 __malloc static char *audiod_status_string(void)
  47 {
  48         const char *status = (audiod_status == AUDIOD_ON)?
  49                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
  50         return para_strdup(status);
  51 }
  52
  53 static int get_play_time_slot_num(void)
  54 {
  55         int i, oldest = -1;
  56
  57         FOR_EACH_SLOT(i) {
  58                 struct slot_info *s = &slot[i];
  59                 if (!s->wng)
  60                         continue;
  61                 if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
  62                                 NULL) > 0)
  63                         continue;
  64                 oldest = i;
  65         }
  66         return oldest;
  67 }
  68
  69 __malloc static char *decoder_flags(void)
  70 {
  71         int i;
  72         char flags[MAX_STREAM_SLOTS + 1];
  73
  74         FOR_EACH_SLOT(i) {
  75                 struct slot_info *s = &slot[i];
  76                 char flag = '0';
  77                 if (s->receiver_node)
  78                         flag += 1;
  79                 if (s->fc)
  80                         flag += 2;
  81                 if (s->wng)
  82                         flag += 4;
  83                 flags[i] = flag;
  84         }
  85         flags[MAX_STREAM_SLOTS] = '\0';
  86         return para_strdup(flags);
  87 }
  88
  89 static int dump_commands(int fd)
  90 {
  91         char *buf = para_strdup(""), *tmp = NULL;
  92         int i;
  93         ssize_t ret;
  94
  95         FOR_EACH_COMMAND(i) {
  96                 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
  97                         audiod_cmds[i].description);
  98                 free(buf);
  99                 buf = tmp;
 100         }
 101         ret = client_write(fd, buf);
 102         free(buf);
 103         return ret;
 104 }
 105
 106 /*
 107  * command handlers don't close their fd on errors (ret < 0) so that
 108  * its caller can send an error message. Otherwise (ret >= 0) it's up
 109  * to each individual command to close the fd if necessary.
 110  */
 111
 112 int com_help(int fd, int argc, char **argv)
 113 {
 114         int i, ret;
 115         char *buf;
 116         const char *dflt = "No such command. Available commands:\n";
 117
 118         if (argc < 2) {
 119                 ret = dump_commands(fd);
 120                 goto out;
 121         }
 122         FOR_EACH_COMMAND(i) {
 123                 if (strcmp(audiod_cmds[i].name, argv[1]))
 124                         continue;
 125                 buf = make_message(
 126                         "NAME\n\t%s -- %s\n"
 127                         "SYNOPSIS\n\tpara_audioc %s\n"
 128                         "DESCRIPTION\n%s\n",
 129                         argv[1],
 130                         audiod_cmds[i].description,
 131                         audiod_cmds[i].usage,
 132                         audiod_cmds[i].help
 133                 );
 134                 ret = client_write(fd, buf);
 135                 free(buf);
 136                 goto out;
 137         }
 138         ret = client_write(fd, dflt);
 139         if (ret > 0)
 140                 ret = dump_commands(fd);
 141 out:
 142         if (ret >= 0)
 143                 close(fd);
 144         return ret;
 145 }
 146
 147 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
 148 {
 149         char *tl = get_task_list();
 150         int ret = 1;
 151         if (tl)
 152                 ret = client_write(fd, tl);
 153         free(tl);
 154         if (ret > 0)
 155                 close(fd);
 156         return ret;
 157 }
 158
 159 int com_kill(int fd, int argc, char **argv)
 160 {
 161         int i, ret = 1;
 162         if (argc < 2)
 163                 return -E_AUDIOD_SYNTAX;
 164         for (i = 1; i < argc; i++) {
 165                 ret = kill_task(argv[i]);
 166                 if (ret < 0)
 167                         break;
 168         }
 169         if (ret > 0)
 170                 close(fd);
 171         return ret;
 172 }
 173
 174 int com_stat(int fd, int argc, char **argv)
 175 {
 176         int i, ret, parser_friendly = 0;
 177         uint64_t mask = 0;
 178         const uint64_t one = 1;
 179         struct para_buffer b = {.flags = 0};
 180
 181         for (i = 1; i < argc; i++) {
 182                 const char *arg = argv[i];
 183                 if (arg[0] != '-')
 184                         break;
 185                 if (!strcmp(arg, "--")) {
 186                         i++;
 187                         break;
 188                 }
 189                 if (!strncmp(arg, "-p", 2)) {
 190                         parser_friendly = 1;
 191                         b.flags = PBF_SIZE_PREFIX;
 192                         continue;
 193                 }
 194         }
 195         if (i >= argc)
 196                 mask--; /* set all bits */
 197         for (; i < argc; i++) {
 198                 ret = stat_item_valid(argv[i]);
 199                 if (ret < 0)
 200                         return ret;
 201                 mask |= (one << ret);
 202         }
 203         PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
 204         FOR_EACH_STATUS_ITEM(i) {
 205                 char *item = stat_item_values[i];
 206                 if (!((one << i) & mask))
 207                         continue;
 208                 WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
 209         }
 210         ret = client_write(fd, b.buf);
 211         if (ret >= 0)
 212                 ret = stat_client_add(fd, mask, parser_friendly);
 213         free(b.buf);
 214         return ret;
 215 }
 216
 217 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 218 {
 219         int i;
 220
 221         FOR_EACH_SLOT(i) {
 222                 struct slot_info *s = &slot[i];
 223                 if (s->format < 0 || !s->fc)
 224                         continue;
 225                 if (slot_num >= 0 && slot_num != i)
 226                         continue;
 227                 if (format >= 0 && s->format != format)
 228                         continue;
 229                 if (num_filters(i) <= filternum)
 230                         continue;
 231                 /* success */
 232                 return  s->fc->filter_nodes + filternum;
 233         }
 234         return NULL;
 235 }
 236
 237 int com_grab(int fd, char *cmdline)
 238 {
 239         struct grab_client *gc;
 240         struct filter_node *fn;
 241         int i, err;
 242         char *msg;
 243
 244         gc = grab_client_new(fd, cmdline, &err);
 245         if (!gc)
 246                 goto err_out;
 247         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
 248         if (fn)
 249                 activate_grab_client(gc, fn);
 250         return 1;
 251 err_out:
 252         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
 253                 return err;
 254         if (err == -E_GC_HELP_GIVEN) {
 255                 msg = make_message("%s\n\n", grab_client_args_info_usage);
 256                 for (i = 0; grab_client_args_info_help[i]; i++) {
 257                         char *tmp = make_message("%s%s\n", msg,
 258                                 grab_client_args_info_help[i]);
 259                         free(msg);
 260                         msg = tmp;
 261                 }
 262         } else
 263                 msg = make_message("%s %s\n",
 264                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
 265                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
 266         err = client_write(fd, msg);
 267         free(msg);
 268         if (err < 0)
 269                 return err;
 270         close(fd);
 271         return 1;
 272 }
 273
 274 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
 275 {
 276         close(fd);
 277         clean_exit(EXIT_SUCCESS, "terminating on user request");
 278 }
 279
 280 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 281 {
 282         audiod_status = AUDIOD_ON;
 283         close(fd);
 284         return 1;
 285 }
 286
 287 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 288 {
 289         audiod_status = AUDIOD_OFF;
 290         close(fd);
 291         return 1;
 292 }
 293
 294 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 295 {
 296         audiod_status = AUDIOD_STANDBY;
 297         close(fd);
 298         return 1;
 299 }
 300
 301 int com_cycle(int fd, int argc, char **argv)
 302 {
 303         switch (audiod_status) {
 304                 case  AUDIOD_ON:
 305                         return com_sb(fd, argc, argv);
 306                         break;
 307                 case  AUDIOD_OFF:
 308                         return com_on(fd, argc, argv);
 309                         break;
 310                 case  AUDIOD_STANDBY:
 311                         return com_off(fd, argc, argv);
 312                         break;
 313         }
 314         close(fd);
 315         return 1;
 316 }
 317
 318 static int check_perms(uid_t uid)
 319 {
 320         int i;
 321
 322         if (!conf.user_allow_given)
 323                 return 1;
 324         for (i = 0; i < conf.user_allow_given; i++)
 325                 if (uid == conf.user_allow_arg[i])
 326                         return 1;
 327         return -E_UCRED_PERM;
 328 }
 329
 330 /**
 331  * handle arriving connections on the local socket
 332  *
 333  * \param accept_fd the fd to call accept() on
 334  *
 335  * This is called whenever para_audiod's main task detects an incoming
 336  * connection by the readability of \a accept_fd. This function reads the
 337  * command sent by the peer, checks the connecting user's permissions by using
 338  * unix socket credentials (if supported by the OS) and calls the corresponding
 339  * command handler if permissions are OK.
 340  *
 341  * \return positive on success, negative on errors
 342  *
 343  * \sa para_accept(), recv_cred_buffer()
 344  * */
 345 int handle_connect(int accept_fd)
 346 {
 347         int i, argc, ret, clifd = -1;
 348         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
 349         struct sockaddr_un unix_addr;
 350         uid_t uid;
 351
 352         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
 353         if (ret < 0)
 354                 goto out;
 355         clifd = ret;
 356         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
 357         if (ret < 0)
 358                 goto out;
 359         uid = ret;
 360         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
 361         ret = check_perms(uid);
 362         if (ret < 0)
 363                 goto out;
 364         cmd = para_strdup(buf);
 365         p = strchr(cmd, '\n');
 366         if (!p)
 367                 p = "";
 368         else {
 369                 *p = '\0';
 370                 p++;
 371         }
 372         for (i = 0; audiod_cmds[i].name; i++) {
 373                 int j;
 374                 if (strcmp(audiod_cmds[i].name, cmd))
 375                         continue;
 376                 if (audiod_cmds[i].handler) {
 377                         argc = split_args(buf, &argv, "\n");
 378                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
 379                         ret = audiod_cmds[i].handler(clifd, argc, argv);
 380                         goto out;
 381                 }
 382                 for (j = 0; p[j]; j++)
 383                         if (p[j] == '\n')
 384                                 p[j] = ' ';
 385                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
 386                 ret = audiod_cmds[i].line_handler(clifd, p);
 387                 goto out;
 388         }
 389         ret = -E_INVALID_AUDIOD_CMD;
 390 out:
 391         free(cmd);
 392         free(buf);
 393         free(argv);
 394         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
 395                 char *tmp = make_message("%s\n", para_strerror(-ret));
 396                 client_write(clifd, tmp);
 397                 free(tmp);
 398                 close(clifd);
 399         }
 400         return ret;
 401 }
 402 /**
 403  * Send the current audiod status to all connected stat clients.
 404  */
 405 void audiod_status_dump(void)
 406 {
 407         int slot_num = get_play_time_slot_num();
 408         char *old, *new;
 409
 410         old = stat_item_values[SI_PLAY_TIME];
 411         new = get_time_string(slot_num);
 412         if (new) {
 413                 if (!old || strcmp(old, new)) {
 414                         free(old);
 415                         stat_item_values[SI_PLAY_TIME] = new;
 416                         stat_client_write_item(SI_PLAY_TIME);
 417                 } else
 418                         free(new);
 419         }
 420
 421         new = uptime_str();
 422         old = stat_item_values[SI_AUDIOD_UPTIME];
 423         if (!old || strcmp(old, new)) {
 424                 free(old);
 425                 stat_item_values[SI_AUDIOD_UPTIME] = new;
 426                 stat_client_write_item(SI_AUDIOD_UPTIME);
 427         } else
 428                 free(new);
 429
 430         old = stat_item_values[SI_AUDIOD_STATUS];
 431         new = audiod_status_string();
 432         if (!old || strcmp(old, new)) {
 433                 free(old);
 434                 stat_item_values[SI_AUDIOD_STATUS] = new;
 435                 stat_client_write_item(SI_AUDIOD_STATUS);
 436         } else
 437                 free(new);
 438
 439         old = stat_item_values[SI_DECODER_FLAGS];
 440         new = decoder_flags();
 441         if (!old || strcmp(old, new)) {
 442                 free(old);
 443                 stat_item_values[SI_DECODER_FLAGS] = new;
 444                 stat_client_write_item(SI_DECODER_FLAGS);
 445         } else
 446                 free(new);
 447 }
 448
 449 /**
 450  * Flush and send all status items.
 451  *
 452  * Send to  each connected client the full status item list
 453  * with empty values.
 454  */
 455 void clear_and_dump_items(void)
 456 {
 457         int i;
 458
 459         FOR_EACH_STATUS_ITEM(i) {
 460                 free(stat_item_values[i]);
 461                 stat_item_values[i] = NULL;
 462                 stat_client_write_item(i);
 463         }
 464 }