audioc.c

   1 /*
   2  * Copyright (C) 2005-2014 Andre Noll <maan@systemlinux.org>
   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 stat_completer(struct i9e_completion_info *ci,
 101                 struct i9e_completion_result *cr)
 102 {
 103         char *sia[] = {STATUS_ITEM_ARRAY NULL};
 104         char *opts[] = {"-p", NULL};
 105
 106         if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
 107                 i9e_complete_option(opts, ci, cr);
 108         else
 109                 i9e_extract_completions(ci->word, sia, &cr->matches);
 110 }
 111
 112 static void grab_completer(struct i9e_completion_info *ci,
 113                 struct i9e_completion_result *cr)
 114 {
 115         char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
 116         i9e_complete_option(opts, ci, cr);
 117 }
 118
 119 static struct i9e_completer audiod_completers[] = {
 120         AUDIOD_COMPLETERS
 121         {.name = NULL}
 122 };
 123
 124 static void audioc_pre_select(struct sched *s, struct task *t)
 125 {
 126         struct audioc_task *at = task_context(t);
 127         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 128
 129         if (ret < 0)
 130                 sched_min_delay(s);
 131         para_fd_set(at->fd, &s->rfds, &s->max_fileno);
 132 }
 133
 134 static int audioc_post_select(struct sched *s, struct task *t)
 135 {
 136         char *buf = NULL;
 137         struct audioc_task *at = task_context(t);
 138         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 139
 140         if (ret < 0)
 141                 goto out;
 142         if (!FD_ISSET(at->fd, &s->rfds))
 143                 return 0;
 144         buf = para_malloc(conf.bufsize_arg);
 145         ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
 146         PARA_DEBUG_LOG("recv: %d\n", ret);
 147         if (ret == 0)
 148                 ret = -E_AUDIOC_EOF;
 149         if (ret < 0)
 150                 goto out;
 151         btr_add_output(buf, ret, at->btrn);
 152         return 0;
 153 out:
 154         if (ret < 0) {
 155                 free(buf);
 156                 btr_remove_node(&at->btrn);
 157                 close(at->fd);
 158         }
 159         return ret;
 160 }
 161
 162 static struct audioc_task audioc_task, *at = &audioc_task;
 163
 164 static int audioc_i9e_line_handler(char *line)
 165 {
 166         char *args = NULL;
 167         int ret;
 168
 169         PARA_DEBUG_LOG("line: %s\n", line);
 170         ret = create_argv(line, " ", &conf.inputs);
 171         if (ret < 0)
 172                 return ret;
 173         conf.inputs_num = ret;
 174         args = concat_args(conf.inputs_num, conf.inputs);
 175         free_argv(conf.inputs);
 176         if (!args)
 177                 return 0;
 178         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 179         ret = connect_audiod(socket_name, args);
 180         if (ret < 0)
 181                 goto out;
 182         at->fd = ret;
 183         ret = mark_fd_nonblocking(at->fd);
 184         if (ret < 0)
 185                 goto close;
 186         free(args);
 187         args = NULL;
 188         at->btrn = btr_new_node(&(struct btr_node_description)
 189                 EMBRACE(.name = "audioc line handler"));
 190         at->task = task_register(&(struct task_info) {
 191                 .name = "audioc",
 192                 .pre_select = audioc_pre_select,
 193                 .post_select = audioc_post_select,
 194                 .context = at,
 195         }, &sched);
 196         i9e_attach_to_stdout(at->btrn);
 197         return 1;
 198 close:
 199         close(at->fd);
 200 out:
 201         free(args);
 202         return ret;
 203 }
 204
 205 __noreturn static void interactive_session(void)
 206 {
 207         int ret;
 208         char *history_file;
 209         struct sigaction act;
 210         struct i9e_client_info ici = {
 211                 .fds = {0, 1, 2},
 212                 .prompt = "para_audioc> ",
 213                 .line_handler = audioc_i9e_line_handler,
 214                 .loglevel = loglevel,
 215                 .completers = audiod_completers,
 216         };
 217         PARA_NOTICE_LOG("\n%s\n", version_text("audioc"));
 218         if (conf.history_file_given)
 219                 history_file = para_strdup(conf.history_file_arg);
 220         else {
 221                 char *home = para_homedir();
 222                 history_file = make_message("%s/.paraslash/audioc.history",
 223                         home);
 224                 free(home);
 225         }
 226         ici.history_file = history_file;
 227
 228         act.sa_handler = i9e_signal_dispatch;
 229         sigemptyset(&act.sa_mask);
 230         act.sa_flags = 0;
 231         sigaction(SIGINT, &act, NULL);
 232         sched.select_function = i9e_select;
 233
 234         sched.default_timeout.tv_sec = 1;
 235         ret = i9e_open(&ici, &sched);
 236         if (ret < 0)
 237                 goto out;
 238         para_log = i9e_log;
 239         ret = schedule(&sched);
 240         sched_shutdown(&sched);
 241         i9e_close();
 242         para_log = stderr_log;
 243 out:
 244         free(history_file);
 245         audioc_cmdline_parser_free(&conf);
 246         if (ret < 0)
 247                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 248         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 249 }
 250
 251 __noreturn static void print_completions(void)
 252 {
 253         int ret = i9e_print_completions(audiod_completers);
 254         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 255 }
 256
 257 #else /* HAVE_READLINE */
 258
 259 __noreturn static void interactive_session(void)
 260 {
 261         PARA_EMERG_LOG("interactive sessions not available\n");
 262         exit(EXIT_FAILURE);
 263 }
 264
 265 __noreturn static void print_completions(void)
 266 {
 267         PARA_EMERG_LOG("command completion not available\n");
 268         exit(EXIT_FAILURE);
 269 }
 270
 271 #endif /* HAVE_READLINE */
 272
 273 static char *configfile_exists(void)
 274 {
 275         char *config_file;
 276         struct stat statbuf;
 277         char *home = para_homedir();
 278
 279         config_file = make_message("%s/.paraslash/audioc.conf", home);
 280         free(home);
 281         if (!stat(config_file, &statbuf))
 282                 return config_file;
 283         free(config_file);
 284         return NULL;
 285 }
 286
 287 __noreturn static void print_help_and_die(void)
 288 {
 289         struct ggo_help h = DEFINE_GGO_HELP(audioc);
 290         bool d = conf.detailed_help_given;
 291
 292         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
 293         exit(0);
 294 }
 295
 296 /**
 297  * The client program to connect to para_audiod.
 298  *
 299  * \param argc Usual argument count.
 300  * \param argv Usual argument vector.
 301  *
 302  * It connects to the "well-known" local socket to communicate with
 303  * para_audiod. Authentication is performed by sending a ucred buffer
 304  * containing the user id to the local socket.
 305  *
 306  * Any data received from the socket is written to stdout.
 307  *
 308  * \return EXIT_SUCCESS or EXIT_FAILURE.
 309  *
 310  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 311  */
 312 int main(int argc, char *argv[])
 313 {
 314         int ret, fd;
 315         char *cf, *buf = NULL, *args = NULL;
 316         size_t bufsize;
 317
 318         audioc_cmdline_parser(argc, argv, &conf);
 319         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 320         version_handle_flag("audioc", conf.version_given);
 321         if (conf.help_given || conf.detailed_help_given)
 322                 print_help_and_die();
 323         cf = configfile_exists();
 324         if (cf) {
 325                 struct audioc_cmdline_parser_params params = {
 326                         .override = 0,
 327                         .initialize = 0,
 328                         .check_required = 0,
 329                         .check_ambiguity = 0,
 330                         .print_errors = 1,
 331
 332                 };
 333                 audioc_cmdline_parser_config_file(cf, &conf, &params);
 334                 free(cf);
 335                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
 336         }
 337         if (conf.socket_given)
 338                 socket_name = para_strdup(conf.socket_arg);
 339         else {
 340                 char *hn = para_hostname();
 341                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 342                         hn);
 343                 free(hn);
 344         }
 345
 346         if (conf.complete_given)
 347                 print_completions();
 348
 349         if (conf.inputs_num == 0)
 350                 interactive_session();
 351         args = concat_args(conf.inputs_num, conf.inputs);
 352
 353         ret = connect_audiod(socket_name, args);
 354         free(socket_name);
 355         if (ret < 0)
 356                 goto out;
 357         fd = ret;
 358         ret = mark_fd_blocking(STDOUT_FILENO);
 359         if (ret < 0)
 360                 goto out;
 361         bufsize = conf.bufsize_arg;
 362         buf = para_malloc(bufsize);
 363         do {
 364                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 365                 if (ret <= 0)
 366                         break;
 367                 ret = write_all(STDOUT_FILENO, buf, n);
 368         } while (ret >= 0);
 369 out:
 370         free(buf);
 371         free(args);
 372         if (ret < 0)
 373                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 374         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 375 }