audioc.c

   1 /*
   2  * Copyright (C) 2005-2012 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 #ifdef HAVE_READLINE
  46 #include "list.h"
  47 #include "sched.h"
  48 #include "buffer_tree.h"
  49 #include "interactive.h"
  50 #include "audiod_completion.h"
  51
  52 static struct sched sched;
  53
  54 struct audioc_task {
  55         int fd;
  56         struct btr_node *btrn;
  57         struct task task;
  58 };
  59
  60 static struct i9e_completer audiod_completers[];
  61
  62 I9E_DUMMY_COMPLETER(cycle);
  63 I9E_DUMMY_COMPLETER(off);
  64 I9E_DUMMY_COMPLETER(on);
  65 I9E_DUMMY_COMPLETER(sb);
  66 I9E_DUMMY_COMPLETER(tasks);
  67 I9E_DUMMY_COMPLETER(term);
  68
  69 static void help_completer(struct i9e_completion_info *ci,
  70                 struct i9e_completion_result *result)
  71 {
  72         result->matches = i9e_complete_commands(ci->word, audiod_completers);
  73 }
  74
  75 static void stat_completer(struct i9e_completion_info *ci,
  76                 struct i9e_completion_result *cr)
  77 {
  78         char *sia[] = {STATUS_ITEM_ARRAY NULL};
  79         char *opts[] = {"-p", NULL};
  80
  81         if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
  82                 i9e_complete_option(opts, ci, cr);
  83         else
  84                 i9e_extract_completions(ci->word, sia, &cr->matches);
  85 }
  86
  87 static void grab_completer(struct i9e_completion_info *ci,
  88                 struct i9e_completion_result *cr)
  89 {
  90         char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
  91         i9e_complete_option(opts, ci, cr);
  92 }
  93
  94 static struct i9e_completer audiod_completers[] = {
  95         AUDIOD_COMPLETERS
  96         {.name = NULL}
  97 };
  98
  99 static void audioc_pre_select(struct sched *s, struct task *t)
 100 {
 101         struct audioc_task *at = container_of(t, struct audioc_task, task);
 102         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 103
 104         if (ret < 0)
 105                 sched_min_delay(s);
 106         para_fd_set(at->fd, &s->rfds, &s->max_fileno);
 107 }
 108
 109 static void audioc_post_select(struct sched *s, struct task *t)
 110 {
 111         char *buf = NULL;
 112         struct audioc_task *at = container_of(t, struct audioc_task, task);
 113         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 114
 115         if (ret < 0)
 116                 goto out;
 117         if (!FD_ISSET(at->fd, &s->rfds))
 118                 return;
 119         buf = para_malloc(conf.bufsize_arg);
 120         ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
 121         PARA_DEBUG_LOG("recv: %d\n", ret);
 122         if (ret == 0)
 123                 ret = -E_AUDIOC_EOF;
 124         if (ret < 0)
 125                 goto out;
 126         btr_add_output(buf, ret, at->btrn);
 127         return;
 128 out:
 129         if (ret < 0) {
 130                 free(buf);
 131                 btr_remove_node(&at->btrn);
 132                 close(at->fd);
 133         }
 134         t->error = ret;
 135 }
 136
 137 static struct audioc_task audioc_task = {
 138         .task = {
 139                 .pre_select = audioc_pre_select,
 140                 .post_select = audioc_post_select,
 141                 .status = "audioc task"
 142         },
 143 }, *at = &audioc_task;
 144
 145 static int audioc_i9e_line_handler(char *line)
 146 {
 147         char *args = NULL;
 148         int ret;
 149         if (!line || !*line)
 150                 return 0;
 151
 152         PARA_DEBUG_LOG("line: %s\n", line);
 153         ret = create_argv(line, " ", &conf.inputs);
 154         if (ret < 0)
 155                 return ret;
 156         conf.inputs_num = ret;
 157         args = concat_args(conf.inputs_num, conf.inputs);
 158         free_argv(conf.inputs);
 159         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 160         ret = connect_local_socket(socket_name);
 161         if (ret < 0)
 162                 goto out;
 163         at->fd = ret;
 164         ret = mark_fd_nonblocking(at->fd);
 165         if (ret < 0)
 166                 goto close;
 167         ret = send_cred_buffer(at->fd, args);
 168         if (ret < 0)
 169                 goto close;
 170         free(args);
 171         args = NULL;
 172         at->btrn = btr_new_node(&(struct btr_node_description)
 173                 EMBRACE(.name = "audioc line handler"));
 174         at->task.error = 0;
 175         register_task(&sched, &at->task);
 176         i9e_attach_to_stdout(at->btrn);
 177         return 1;
 178 close:
 179         close(at->fd);
 180 out:
 181         free(args);
 182         return ret;
 183 }
 184
 185 __noreturn static void interactive_session(void)
 186 {
 187         int ret;
 188         char *history_file;
 189         struct sigaction act;
 190         struct i9e_client_info ici = {
 191                 .fds = {0, 1, 2},
 192                 .prompt = "para_audioc> ",
 193                 .line_handler = audioc_i9e_line_handler,
 194                 .loglevel = loglevel,
 195                 .completers = audiod_completers,
 196         };
 197         PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("audioc"));
 198         if (conf.history_file_given)
 199                 history_file = para_strdup(conf.history_file_arg);
 200         else {
 201                 char *home = para_homedir();
 202                 history_file = make_message("%s/.paraslash/audioc.history",
 203                         home);
 204                 free(home);
 205         }
 206         ici.history_file = history_file;
 207
 208         act.sa_handler = i9e_signal_dispatch;
 209         sigemptyset(&act.sa_mask);
 210         act.sa_flags = 0;
 211         sigaction(SIGINT, &act, NULL);
 212         sched.select_function = i9e_select;
 213
 214         sched.default_timeout.tv_sec = 1;
 215         ret = i9e_open(&ici, &sched);
 216         if (ret < 0)
 217                 goto out;
 218         para_log = i9e_log;
 219         ret = schedule(&sched);
 220         i9e_close();
 221         para_log = stderr_log;
 222 out:
 223         free(history_file);
 224         audioc_cmdline_parser_free(&conf);
 225         if (ret < 0)
 226                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 227         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 228 }
 229
 230 __noreturn static void print_completions(void)
 231 {
 232         int ret = i9e_print_completions(audiod_completers);
 233         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 234 }
 235
 236 #else /* HAVE_READLINE */
 237
 238 __noreturn static void interactive_session(void)
 239 {
 240         PARA_EMERG_LOG("interactive sessions not available\n");
 241         exit(EXIT_FAILURE);
 242 }
 243
 244 __noreturn static void print_completions(void)
 245 {
 246         PARA_EMERG_LOG("command completion not available\n");
 247         exit(EXIT_FAILURE);
 248 }
 249
 250 #endif /* HAVE_READLINE */
 251
 252 static char *configfile_exists(void)
 253 {
 254         char *config_file;
 255         struct stat statbuf;
 256         char *home = para_homedir();
 257
 258         config_file = make_message("%s/.paraslash/audioc.conf", home);
 259         free(home);
 260         if (!stat(config_file, &statbuf))
 261                 return config_file;
 262         free(config_file);
 263         return NULL;
 264 }
 265
 266 /**
 267  * The client program to connect to para_audiod.
 268  *
 269  * \param argc Usual argument count.
 270  * \param argv Usual argument vector.
 271  *
 272  * It connects to the "well-known" local socket to communicate with
 273  * para_audiod. Authentication is performed by sending a ucred buffer
 274  * containing the user id to the local socket.
 275  *
 276  * Any data received from the socket is written to stdout.
 277  *
 278  * \return EXIT_SUCCESS or EXIT_FAILURE.
 279  *
 280  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 281  */
 282 int main(int argc, char *argv[])
 283 {
 284         int ret = -E_AUDIOC_SYNTAX, fd;
 285         char *cf, *buf = NULL, *args = NULL;
 286         size_t bufsize;
 287
 288         if (audioc_cmdline_parser(argc, argv, &conf))
 289                 goto out;
 290         HANDLE_VERSION_FLAG("audioc", conf);
 291         cf = configfile_exists();
 292         if (cf) {
 293                 struct audioc_cmdline_parser_params params = {
 294                         .override = 0,
 295                         .initialize = 0,
 296                         .check_required = 0,
 297                         .check_ambiguity = 0
 298                 };
 299                 ret = audioc_cmdline_parser_config_file(cf, &conf, &params);
 300                 free(cf);
 301                 if (ret) {
 302                         fprintf(stderr, "parse error in config file\n");
 303                         exit(EXIT_FAILURE);
 304                 }
 305         }
 306         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 307         if (conf.socket_given)
 308                 socket_name = para_strdup(conf.socket_arg);
 309         else {
 310                 char *hn = para_hostname();
 311                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 312                         hn);
 313                 free(hn);
 314         }
 315
 316         if (conf.complete_given)
 317                 print_completions();
 318
 319         if (conf.inputs_num == 0)
 320                 interactive_session();
 321         args = concat_args(conf.inputs_num, conf.inputs);
 322
 323         ret = connect_local_socket(socket_name);
 324         free(socket_name);
 325         if (ret < 0) {
 326                 PARA_EMERG_LOG("failed to connect to local socket\n");
 327                 goto out;
 328         }
 329         fd = ret;
 330         ret = send_cred_buffer(fd, args);
 331         if (ret < 0)
 332                 goto out;
 333         bufsize = conf.bufsize_arg;
 334         buf = para_malloc(bufsize);
 335         ret = mark_fd_blocking(STDOUT_FILENO);
 336         if (ret < 0)
 337                 goto out;
 338         do {
 339                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 340                 if (ret <= 0)
 341                         break;
 342                 ret = write_all(STDOUT_FILENO, buf, n);
 343         } while (ret >= 0);
 344 out:
 345         free(buf);
 346         free(args);
 347         if (ret < 0)
 348                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 349         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 350 }