audioc.c

   1 /*
   2  * Copyright (C) 2005-2014 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audioc.c The client program used to connect to para_audiod. */
   8
   9 #include <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <stdbool.h>
  17 #include <signal.h>
  18
  19 #include "audioc.cmdline.h"
  20 #include "para.h"
  21 #include "error.h"
  22 #include "net.h"
  23 #include "string.h"
  24 #include "fd.h"
  25 #include "ggo.h"
  26 #include "version.h"
  27
  28 INIT_AUDIOC_ERRLISTS;
  29
  30 /** The gengetopt structure containing command line args. */
  31 static struct audioc_args_info conf;
  32 static char *socket_name;
  33
  34
  35 static int loglevel;
  36 INIT_STDERR_LOGGING(loglevel);
  37
  38 static char *concat_args(unsigned argc, char * const *argv)
  39 {
  40         int i;
  41         char *buf = NULL;
  42
  43         for (i = 0; i < argc; i++) {
  44                 buf = para_strcat(buf, argv[i]);
  45                 if (i != argc - 1)
  46                         buf = para_strcat(buf, "\n");
  47         }
  48         return buf;
  49 }
  50
  51 static int connect_audiod(const char *sname, char *args)
  52 {
  53         int fd = -1, ret;
  54
  55         ret = connect_local_socket(sname);
  56         if (ret < 0)
  57                 goto fail;
  58         fd = ret;
  59         ret = send_cred_buffer(fd, args);
  60         if (ret < 0)
  61                 goto fail;
  62         return fd;
  63 fail:
  64         PARA_ERROR_LOG("could not connect %s\n", sname);
  65         if (fd >= 0)
  66                 close(fd);
  67         return ret;
  68 }
  69
  70 #ifdef HAVE_READLINE
  71 #include "list.h"
  72 #include "sched.h"
  73 #include "buffer_tree.h"
  74 #include "interactive.h"
  75 #include "audiod_completion.h"
  76
  77 static struct sched sched;
  78
  79 struct audioc_task {
  80         int fd;
  81         struct btr_node *btrn;
  82         struct task *task;
  83 };
  84
  85 static struct i9e_completer audiod_completers[];
  86
  87 I9E_DUMMY_COMPLETER(cycle);
  88 I9E_DUMMY_COMPLETER(off);
  89 I9E_DUMMY_COMPLETER(on);
  90 I9E_DUMMY_COMPLETER(sb);
  91 I9E_DUMMY_COMPLETER(tasks);
  92 I9E_DUMMY_COMPLETER(term);
  93
  94 static void help_completer(struct i9e_completion_info *ci,
  95                 struct i9e_completion_result *result)
  96 {
  97         result->matches = i9e_complete_commands(ci->word, audiod_completers);
  98 }
  99
 100 static void version_completer(struct i9e_completion_info *ci,
 101                 struct i9e_completion_result *cr)
 102 {
 103         char *opts[] = {"-v", NULL};
 104
 105         if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
 106                 i9e_complete_option(opts, ci, cr);
 107 }
 108
 109 static void stat_completer(struct i9e_completion_info *ci,
 110                 struct i9e_completion_result *cr)
 111 {
 112         char *sia[] = {STATUS_ITEM_ARRAY NULL};
 113         char *opts[] = {"-p", NULL};
 114
 115         if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
 116                 i9e_complete_option(opts, ci, cr);
 117         else
 118                 i9e_extract_completions(ci->word, sia, &cr->matches);
 119 }
 120
 121 static void grab_completer(struct i9e_completion_info *ci,
 122                 struct i9e_completion_result *cr)
 123 {
 124         char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
 125         i9e_complete_option(opts, ci, cr);
 126 }
 127
 128 static struct i9e_completer audiod_completers[] = {
 129         AUDIOD_COMPLETERS
 130         {.name = NULL}
 131 };
 132
 133 static void audioc_pre_select(struct sched *s, void *context)
 134 {
 135         struct audioc_task *at = context;
 136         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 137
 138         if (ret < 0)
 139                 sched_min_delay(s);
 140         para_fd_set(at->fd, &s->rfds, &s->max_fileno);
 141 }
 142
 143 static int audioc_post_select(struct sched *s, void *context)
 144 {
 145         char *buf = NULL;
 146         struct audioc_task *at = context;
 147         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 148
 149         if (ret < 0)
 150                 goto out;
 151         if (!FD_ISSET(at->fd, &s->rfds))
 152                 return 0;
 153         buf = para_malloc(conf.bufsize_arg);
 154         ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
 155         PARA_DEBUG_LOG("recv: %d\n", ret);
 156         if (ret == 0)
 157                 ret = -E_AUDIOC_EOF;
 158         if (ret < 0)
 159                 goto out;
 160         btr_add_output(buf, ret, at->btrn);
 161         return 0;
 162 out:
 163         if (ret < 0) {
 164                 free(buf);
 165                 btr_remove_node(&at->btrn);
 166                 close(at->fd);
 167         }
 168         return ret;
 169 }
 170
 171 static struct audioc_task audioc_task, *at = &audioc_task;
 172
 173 static int audioc_i9e_line_handler(char *line)
 174 {
 175         char *args = NULL;
 176         int ret;
 177
 178         PARA_DEBUG_LOG("line: %s\n", line);
 179         ret = create_argv(line, " ", &conf.inputs);
 180         if (ret < 0)
 181                 return ret;
 182         conf.inputs_num = ret;
 183         args = concat_args(conf.inputs_num, conf.inputs);
 184         free_argv(conf.inputs);
 185         if (!args)
 186                 return 0;
 187         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 188         ret = connect_audiod(socket_name, args);
 189         if (ret < 0)
 190                 goto out;
 191         at->fd = ret;
 192         ret = mark_fd_nonblocking(at->fd);
 193         if (ret < 0)
 194                 goto close;
 195         free(args);
 196         args = NULL;
 197         at->btrn = btr_new_node(&(struct btr_node_description)
 198                 EMBRACE(.name = "audioc line handler"));
 199         at->task = task_register(&(struct task_info) {
 200                 .name = "audioc",
 201                 .pre_select = audioc_pre_select,
 202                 .post_select = audioc_post_select,
 203                 .context = at,
 204         }, &sched);
 205         i9e_attach_to_stdout(at->btrn);
 206         return 1;
 207 close:
 208         close(at->fd);
 209 out:
 210         free(args);
 211         return ret;
 212 }
 213
 214 __noreturn static void interactive_session(void)
 215 {
 216         int ret;
 217         char *history_file;
 218         struct sigaction act;
 219         struct i9e_client_info ici = {
 220                 .fds = {0, 1, 2},
 221                 .prompt = "para_audioc> ",
 222                 .line_handler = audioc_i9e_line_handler,
 223                 .loglevel = loglevel,
 224                 .completers = audiod_completers,
 225         };
 226         PARA_NOTICE_LOG("\n%s\n", version_text("audioc"));
 227         if (conf.history_file_given)
 228                 history_file = para_strdup(conf.history_file_arg);
 229         else {
 230                 char *home = para_homedir();
 231                 history_file = make_message("%s/.paraslash/audioc.history",
 232                         home);
 233                 free(home);
 234         }
 235         ici.history_file = history_file;
 236
 237         act.sa_handler = i9e_signal_dispatch;
 238         sigemptyset(&act.sa_mask);
 239         act.sa_flags = 0;
 240         sigaction(SIGINT, &act, NULL);
 241         sched.select_function = i9e_select;
 242
 243         sched.default_timeout.tv_sec = 1;
 244         ret = i9e_open(&ici, &sched);
 245         if (ret < 0)
 246                 goto out;
 247         para_log = i9e_log;
 248         ret = schedule(&sched);
 249         sched_shutdown(&sched);
 250         i9e_close();
 251         para_log = stderr_log;
 252 out:
 253         free(history_file);
 254         audioc_cmdline_parser_free(&conf);
 255         if (ret < 0)
 256                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 257         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 258 }
 259
 260 __noreturn static void print_completions(void)
 261 {
 262         int ret = i9e_print_completions(audiod_completers);
 263         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 264 }
 265
 266 #else /* HAVE_READLINE */
 267
 268 __noreturn static void interactive_session(void)
 269 {
 270         PARA_EMERG_LOG("interactive sessions not available\n");
 271         exit(EXIT_FAILURE);
 272 }
 273
 274 __noreturn static void print_completions(void)
 275 {
 276         PARA_EMERG_LOG("command completion not available\n");
 277         exit(EXIT_FAILURE);
 278 }
 279
 280 #endif /* HAVE_READLINE */
 281
 282 static char *configfile_exists(void)
 283 {
 284         char *config_file;
 285         struct stat statbuf;
 286         char *home = para_homedir();
 287
 288         config_file = make_message("%s/.paraslash/audioc.conf", home);
 289         free(home);
 290         if (!stat(config_file, &statbuf))
 291                 return config_file;
 292         free(config_file);
 293         return NULL;
 294 }
 295
 296 __noreturn static void print_help_and_die(void)
 297 {
 298         struct ggo_help h = DEFINE_GGO_HELP(audioc);
 299         bool d = conf.detailed_help_given;
 300
 301         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
 302         exit(0);
 303 }
 304
 305 /**
 306  * The client program to connect to para_audiod.
 307  *
 308  * \param argc Usual argument count.
 309  * \param argv Usual argument vector.
 310  *
 311  * It connects to the "well-known" local socket to communicate with
 312  * para_audiod. Authentication is performed by sending a ucred buffer
 313  * containing the user id to the local socket.
 314  *
 315  * Any data received from the socket is written to stdout.
 316  *
 317  * \return EXIT_SUCCESS or EXIT_FAILURE.
 318  *
 319  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 320  */
 321 int main(int argc, char *argv[])
 322 {
 323         int ret, fd;
 324         char *cf, *buf = NULL, *args = NULL;
 325         size_t bufsize;
 326
 327         audioc_cmdline_parser(argc, argv, &conf);
 328         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 329         version_handle_flag("audioc", conf.version_given);
 330         if (conf.help_given || conf.detailed_help_given)
 331                 print_help_and_die();
 332         cf = configfile_exists();
 333         if (cf) {
 334                 struct audioc_cmdline_parser_params params = {
 335                         .override = 0,
 336                         .initialize = 0,
 337                         .check_required = 0,
 338                         .check_ambiguity = 0,
 339                         .print_errors = 1,
 340
 341                 };
 342                 audioc_cmdline_parser_config_file(cf, &conf, &params);
 343                 free(cf);
 344                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
 345         }
 346         if (conf.socket_given)
 347                 socket_name = para_strdup(conf.socket_arg);
 348         else {
 349                 char *hn = para_hostname();
 350                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 351                         hn);
 352                 free(hn);
 353         }
 354
 355         if (conf.complete_given)
 356                 print_completions();
 357
 358         if (conf.inputs_num == 0)
 359                 interactive_session();
 360         args = concat_args(conf.inputs_num, conf.inputs);
 361
 362         ret = connect_audiod(socket_name, args);
 363         free(socket_name);
 364         if (ret < 0)
 365                 goto out;
 366         fd = ret;
 367         ret = mark_fd_blocking(STDOUT_FILENO);
 368         if (ret < 0)
 369                 goto out;
 370         bufsize = conf.bufsize_arg;
 371         buf = para_malloc(bufsize);
 372         do {
 373                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 374                 if (ret <= 0)
 375                         break;
 376                 ret = write_all(STDOUT_FILENO, buf, n);
 377         } while (ret >= 0);
 378 out:
 379         free(buf);
 380         free(args);
 381         if (ret < 0)
 382                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 383         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 384 }