audioc.c

   1 /*
   2  * Copyright (C) 2005-2013 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 = container_of(t, struct audioc_task, task);
 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 = container_of(t, struct audioc_task, task);
 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 = {
 163         .task = {
 164                 .pre_select = audioc_pre_select,
 165                 .post_select = audioc_post_select,
 166                 .status = "audioc task"
 167         },
 168 }, *at = &audioc_task;
 169
 170 static int audioc_i9e_line_handler(char *line)
 171 {
 172         char *args = NULL;
 173         int ret;
 174
 175         PARA_DEBUG_LOG("line: %s\n", line);
 176         ret = create_argv(line, " ", &conf.inputs);
 177         if (ret < 0)
 178                 return ret;
 179         conf.inputs_num = ret;
 180         args = concat_args(conf.inputs_num, conf.inputs);
 181         free_argv(conf.inputs);
 182         if (!args)
 183                 return 0;
 184         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 185         ret = connect_audiod(socket_name, args);
 186         if (ret < 0)
 187                 goto out;
 188         at->fd = ret;
 189         ret = mark_fd_nonblocking(at->fd);
 190         if (ret < 0)
 191                 goto close;
 192         free(args);
 193         args = NULL;
 194         at->btrn = btr_new_node(&(struct btr_node_description)
 195                 EMBRACE(.name = "audioc line handler"));
 196         at->task.error = 0;
 197         register_task(&sched, &at->task);
 198         i9e_attach_to_stdout(at->btrn);
 199         return 1;
 200 close:
 201         close(at->fd);
 202 out:
 203         free(args);
 204         return ret;
 205 }
 206
 207 __noreturn static void interactive_session(void)
 208 {
 209         int ret;
 210         char *history_file;
 211         struct sigaction act;
 212         struct i9e_client_info ici = {
 213                 .fds = {0, 1, 2},
 214                 .prompt = "para_audioc> ",
 215                 .line_handler = audioc_i9e_line_handler,
 216                 .loglevel = loglevel,
 217                 .completers = audiod_completers,
 218         };
 219         PARA_NOTICE_LOG("\n%s\n", version_text("audioc"));
 220         if (conf.history_file_given)
 221                 history_file = para_strdup(conf.history_file_arg);
 222         else {
 223                 char *home = para_homedir();
 224                 history_file = make_message("%s/.paraslash/audioc.history",
 225                         home);
 226                 free(home);
 227         }
 228         ici.history_file = history_file;
 229
 230         act.sa_handler = i9e_signal_dispatch;
 231         sigemptyset(&act.sa_mask);
 232         act.sa_flags = 0;
 233         sigaction(SIGINT, &act, NULL);
 234         sched.select_function = i9e_select;
 235
 236         sched.default_timeout.tv_sec = 1;
 237         ret = i9e_open(&ici, &sched);
 238         if (ret < 0)
 239                 goto out;
 240         para_log = i9e_log;
 241         ret = schedule(&sched);
 242         i9e_close();
 243         para_log = stderr_log;
 244 out:
 245         free(history_file);
 246         audioc_cmdline_parser_free(&conf);
 247         if (ret < 0)
 248                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 249         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 250 }
 251
 252 __noreturn static void print_completions(void)
 253 {
 254         int ret = i9e_print_completions(audiod_completers);
 255         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 256 }
 257
 258 #else /* HAVE_READLINE */
 259
 260 __noreturn static void interactive_session(void)
 261 {
 262         PARA_EMERG_LOG("interactive sessions not available\n");
 263         exit(EXIT_FAILURE);
 264 }
 265
 266 __noreturn static void print_completions(void)
 267 {
 268         PARA_EMERG_LOG("command completion not available\n");
 269         exit(EXIT_FAILURE);
 270 }
 271
 272 #endif /* HAVE_READLINE */
 273
 274 static char *configfile_exists(void)
 275 {
 276         char *config_file;
 277         struct stat statbuf;
 278         char *home = para_homedir();
 279
 280         config_file = make_message("%s/.paraslash/audioc.conf", home);
 281         free(home);
 282         if (!stat(config_file, &statbuf))
 283                 return config_file;
 284         free(config_file);
 285         return NULL;
 286 }
 287
 288 __noreturn static void print_help_and_die(void)
 289 {
 290         struct ggo_help h = DEFINE_GGO_HELP(audioc);
 291         bool d = conf.detailed_help_given;
 292
 293         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
 294         exit(0);
 295 }
 296
 297 /**
 298  * The client program to connect to para_audiod.
 299  *
 300  * \param argc Usual argument count.
 301  * \param argv Usual argument vector.
 302  *
 303  * It connects to the "well-known" local socket to communicate with
 304  * para_audiod. Authentication is performed by sending a ucred buffer
 305  * containing the user id to the local socket.
 306  *
 307  * Any data received from the socket is written to stdout.
 308  *
 309  * \return EXIT_SUCCESS or EXIT_FAILURE.
 310  *
 311  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 312  */
 313 int main(int argc, char *argv[])
 314 {
 315         int ret, fd;
 316         char *cf, *buf = NULL, *args = NULL;
 317         size_t bufsize;
 318
 319         audioc_cmdline_parser(argc, argv, &conf);
 320         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 321         version_handle_flag("audioc", conf.version_given);
 322         if (conf.help_given || conf.detailed_help_given)
 323                 print_help_and_die();
 324         cf = configfile_exists();
 325         if (cf) {
 326                 struct audioc_cmdline_parser_params params = {
 327                         .override = 0,
 328                         .initialize = 0,
 329                         .check_required = 0,
 330                         .check_ambiguity = 0,
 331                         .print_errors = 1,
 332
 333                 };
 334                 audioc_cmdline_parser_config_file(cf, &conf, &params);
 335                 free(cf);
 336                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
 337         }
 338         if (conf.socket_given)
 339                 socket_name = para_strdup(conf.socket_arg);
 340         else {
 341                 char *hn = para_hostname();
 342                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 343                         hn);
 344                 free(hn);
 345         }
 346
 347         if (conf.complete_given)
 348                 print_completions();
 349
 350         if (conf.inputs_num == 0)
 351                 interactive_session();
 352         args = concat_args(conf.inputs_num, conf.inputs);
 353
 354         ret = connect_audiod(socket_name, args);
 355         free(socket_name);
 356         if (ret < 0)
 357                 goto out;
 358         fd = ret;
 359         ret = mark_fd_blocking(STDOUT_FILENO);
 360         if (ret < 0)
 361                 goto out;
 362         bufsize = conf.bufsize_arg;
 363         buf = para_malloc(bufsize);
 364         do {
 365                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 366                 if (ret <= 0)
 367                         break;
 368                 ret = write_all(STDOUT_FILENO, buf, n);
 369         } while (ret >= 0);
 370 out:
 371         free(buf);
 372         free(args);
 373         if (ret < 0)
 374                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 375         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 376 }