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