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                 btr_free_node(at->btrn);
 133                 at->btrn = NULL;
 134                 close(at->fd);
 135         }
 136         t->error = ret;
 137 }
 138
 139 static struct audioc_task audioc_task = {
 140         .task = {
 141                 .pre_select = audioc_pre_select,
 142                 .post_select = audioc_post_select,
 143                 .status = "audioc task"
 144         },
 145 }, *at = &audioc_task;
 146
 147 static int audioc_i9e_line_handler(char *line)
 148 {
 149         char *args = NULL;
 150         int ret;
 151         if (!line || !*line)
 152                 return 0;
 153
 154         PARA_DEBUG_LOG("line: %s\n", line);
 155         ret = create_argv(line, " ", &conf.inputs);
 156         if (ret < 0)
 157                 return ret;
 158         conf.inputs_num = ret;
 159         args = concat_args(conf.inputs_num, conf.inputs);
 160         free_argv(conf.inputs);
 161         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 162         ret = connect_local_socket(socket_name);
 163         if (ret < 0)
 164                 goto out;
 165         at->fd = ret;
 166         ret = mark_fd_nonblocking(at->fd);
 167         if (ret < 0)
 168                 goto close;
 169         ret = send_cred_buffer(at->fd, args);
 170         if (ret < 0)
 171                 goto close;
 172         free(args);
 173         args = NULL;
 174         at->btrn = btr_new_node(&(struct btr_node_description)
 175                 EMBRACE(.name = "audioc line handler"));
 176         at->task.error = 0;
 177         register_task(&sched, &at->task);
 178         i9e_attach_to_stdout(at->btrn);
 179         return 1;
 180 close:
 181         close(at->fd);
 182 out:
 183         free(args);
 184         return ret;
 185 }
 186
 187 __noreturn static void interactive_session(void)
 188 {
 189         int ret;
 190         char *history_file;
 191         struct sigaction act;
 192         struct i9e_client_info ici = {
 193                 .fds = {0, 1, 2},
 194                 .prompt = "para_audioc> ",
 195                 .line_handler = audioc_i9e_line_handler,
 196                 .loglevel = loglevel,
 197                 .completers = audiod_completers,
 198         };
 199         PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("audioc"));
 200         if (conf.history_file_given)
 201                 history_file = para_strdup(conf.history_file_arg);
 202         else {
 203                 char *home = para_homedir();
 204                 history_file = make_message("%s/.paraslash/audioc.history",
 205                         home);
 206                 free(home);
 207         }
 208         ici.history_file = history_file;
 209
 210         act.sa_handler = i9e_signal_dispatch;
 211         sigemptyset(&act.sa_mask);
 212         act.sa_flags = 0;
 213         sigaction(SIGINT, &act, NULL);
 214         sched.select_function = i9e_select;
 215
 216         sched.default_timeout.tv_sec = 1;
 217         ret = i9e_open(&ici, &sched);
 218         if (ret < 0)
 219                 goto out;
 220         para_log = i9e_log;
 221         ret = schedule(&sched);
 222         i9e_close();
 223         para_log = stderr_log;
 224 out:
 225         free(history_file);
 226         audioc_cmdline_parser_free(&conf);
 227         if (ret < 0)
 228                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 229         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 230 }
 231
 232 __noreturn static void print_completions(void)
 233 {
 234         int ret = i9e_print_completions(audiod_completers);
 235         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 236 }
 237
 238 #else /* HAVE_READLINE */
 239
 240 __noreturn static void interactive_session(void)
 241 {
 242         PARA_EMERG_LOG("interactive sessions not available\n");
 243         exit(EXIT_FAILURE);
 244 }
 245
 246 __noreturn static void print_completions(void)
 247 {
 248         PARA_EMERG_LOG("command completion not available\n");
 249         exit(EXIT_FAILURE);
 250 }
 251
 252 #endif /* HAVE_READLINE */
 253
 254 static char *configfile_exists(void)
 255 {
 256         char *config_file;
 257         struct stat statbuf;
 258         char *home = para_homedir();
 259
 260         config_file = make_message("%s/.paraslash/audioc.conf", home);
 261         free(home);
 262         if (!stat(config_file, &statbuf))
 263                 return config_file;
 264         free(config_file);
 265         return NULL;
 266 }
 267
 268 /**
 269  * The client program to connect to para_audiod.
 270  *
 271  * \param argc Usual argument count.
 272  * \param argv Usual argument vector.
 273  *
 274  * It connects to the "well-known" local socket to communicate with
 275  * para_audiod. Authentication is performed by sending a ucred buffer
 276  * containing the user id to the local socket.
 277  *
 278  * Any data received from the socket is written to stdout.
 279  *
 280  * \return EXIT_SUCCESS or EXIT_FAILURE.
 281  *
 282  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 283  */
 284 int main(int argc, char *argv[])
 285 {
 286         int ret = -E_AUDIOC_SYNTAX, fd;
 287         char *cf, *buf = NULL, *args = NULL;
 288         size_t bufsize;
 289
 290         if (audioc_cmdline_parser(argc, argv, &conf))
 291                 goto out;
 292         HANDLE_VERSION_FLAG("audioc", conf);
 293         cf = configfile_exists();
 294         if (cf) {
 295                 struct audioc_cmdline_parser_params params = {
 296                         .override = 0,
 297                         .initialize = 0,
 298                         .check_required = 0,
 299                         .check_ambiguity = 0
 300                 };
 301                 ret = audioc_cmdline_parser_config_file(cf, &conf, &params);
 302                 free(cf);
 303                 if (ret) {
 304                         fprintf(stderr, "parse error in config file\n");
 305                         exit(EXIT_FAILURE);
 306                 }
 307         }
 308         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 309         if (conf.socket_given)
 310                 socket_name = para_strdup(conf.socket_arg);
 311         else {
 312                 char *hn = para_hostname();
 313                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 314                         hn);
 315                 free(hn);
 316         }
 317
 318         if (conf.complete_given)
 319                 print_completions();
 320
 321         if (conf.inputs_num == 0)
 322                 interactive_session();
 323         args = concat_args(conf.inputs_num, conf.inputs);
 324
 325         ret = connect_local_socket(socket_name);
 326         free(socket_name);
 327         if (ret < 0) {
 328                 PARA_EMERG_LOG("failed to connect to local socket\n");
 329                 goto out;
 330         }
 331         fd = ret;
 332         ret = send_cred_buffer(fd, args);
 333         if (ret < 0)
 334                 goto out;
 335         bufsize = conf.bufsize_arg;
 336         buf = para_malloc(bufsize);
 337         ret = mark_fd_blocking(STDOUT_FILENO);
 338         if (ret < 0)
 339                 goto out;
 340         do {
 341                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 342                 if (ret <= 0)
 343                         break;
 344                 ret = write_all(STDOUT_FILENO, buf, n);
 345         } while (ret >= 0);
 346 out:
 347         free(buf);
 348         free(args);
 349         if (ret < 0)
 350                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 351         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 352 }