audioc.c

   1 /*
   2  * Copyright (C) 2005-2011 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
  13 #include "audioc.cmdline.h"
  14 #include "para.h"
  15 #include "error.h"
  16 #include "net.h"
  17 #include "string.h"
  18 #include "fd.h"
  19 #include "version.h"
  20
  21 INIT_AUDIOC_ERRLISTS;
  22
  23 /** The gengetopt structure containing command line args. */
  24 static struct audioc_args_info conf;
  25 static char *socket_name;
  26
  27
  28 static int loglevel;
  29 INIT_STDERR_LOGGING(loglevel);
  30
  31 static char *concat_args(unsigned argc, char * const *argv)
  32 {
  33         int i;
  34         char *buf = NULL;
  35
  36         for (i = 0; i < argc; i++) {
  37                 buf = para_strcat(buf, argv[i]);
  38                 if (i != argc - 1)
  39                         buf = para_strcat(buf, "\n");
  40         }
  41         return buf;
  42 }
  43
  44 #ifdef HAVE_READLINE
  45 #include "list.h"
  46 #include "sched.h"
  47 #include "buffer_tree.h"
  48 #include "interactive.h"
  49 #include "audiod_completion.h"
  50
  51 static struct sched sched;
  52
  53 struct audioc_task {
  54         int fd;
  55         struct btr_node *btrn;
  56         struct task task;
  57 };
  58
  59 static struct i9e_completer audiod_completers[];
  60
  61 I9E_DUMMY_COMPLETER(cycle);
  62 I9E_DUMMY_COMPLETER(off);
  63 I9E_DUMMY_COMPLETER(on);
  64 I9E_DUMMY_COMPLETER(sb);
  65 I9E_DUMMY_COMPLETER(tasks);
  66 I9E_DUMMY_COMPLETER(term);
  67
  68 static void help_completer(struct i9e_completion_info *ci,
  69                 struct i9e_completion_result *result)
  70 {
  71         result->matches = i9e_complete_commands(ci->word, audiod_completers);
  72 }
  73
  74 static void stat_completer(struct i9e_completion_info *ci,
  75                 struct i9e_completion_result *cr)
  76 {
  77         char *sia[] = {STATUS_ITEM_ARRAY NULL};
  78         char *opts[] = {"-p", NULL};
  79
  80         if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
  81                 i9e_complete_option(opts, ci, cr);
  82         else
  83                 i9e_extract_completions(ci->word, sia, &cr->matches);
  84 }
  85
  86 static void grab_completer(struct i9e_completion_info *ci,
  87                 struct i9e_completion_result *cr)
  88 {
  89         char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
  90         i9e_complete_option(opts, ci, cr);
  91 }
  92
  93 static struct i9e_completer audiod_completers[] = {
  94         AUDIOD_COMPLETERS
  95         {.name = NULL}
  96 };
  97
  98 static void audioc_pre_select(struct sched *s, struct task *t)
  99 {
 100         struct audioc_task *at = container_of(t, struct audioc_task, task);
 101         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 102
 103         if (ret < 0)
 104                 sched_min_delay(s);
 105         para_fd_set(at->fd, &s->rfds, &s->max_fileno);
 106 }
 107
 108 static void audioc_post_select(struct sched *s, struct task *t)
 109 {
 110         char *buf = NULL;
 111         struct audioc_task *at = container_of(t, struct audioc_task, task);
 112         int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
 113
 114         if (ret < 0)
 115                 goto out;
 116         if (!FD_ISSET(at->fd, &s->rfds))
 117                 return;
 118         buf = para_malloc(conf.bufsize_arg);
 119         ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
 120         PARA_DEBUG_LOG("recv: %d\n", ret);
 121         if (ret == 0)
 122                 ret = -E_AUDIOC_EOF;
 123         if (ret < 0)
 124                 goto out;
 125         btr_add_output(buf, ret, at->btrn);
 126         return;
 127 out:
 128         if (ret < 0) {
 129                 free(buf);
 130                 btr_remove_node(at->btrn);
 131                 btr_free_node(at->btrn);
 132                 at->btrn = NULL;
 133                 close(at->fd);
 134         }
 135         t->error = ret;
 136 }
 137
 138 static struct audioc_task audioc_task = {
 139         .task = {
 140                 .pre_select = audioc_pre_select,
 141                 .post_select = audioc_post_select,
 142                 .status = "audioc task"
 143         },
 144 }, *at = &audioc_task;
 145
 146 static int audioc_i9e_line_handler(char *line)
 147 {
 148         char *args = NULL;
 149         int ret;
 150         if (!line || !*line)
 151                 return 0;
 152
 153         PARA_DEBUG_LOG("line: %s\n", line);
 154         ret = create_argv(line, " ", &conf.inputs);
 155         if (ret < 0)
 156                 return ret;
 157         conf.inputs_num = ret;
 158         args = concat_args(conf.inputs_num, conf.inputs);
 159         free_argv(conf.inputs);
 160         conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
 161         ret = connect_local_socket(socket_name);
 162         if (ret < 0)
 163                 goto out;
 164         at->fd = ret;
 165         ret = mark_fd_nonblocking(at->fd);
 166         if (ret < 0)
 167                 goto close;
 168         ret = send_cred_buffer(at->fd, args);
 169         if (ret < 0)
 170                 goto close;
 171         free(args);
 172         args = NULL;
 173         at->btrn = btr_new_node(&(struct btr_node_description)
 174                 EMBRACE(.name = "audioc line handler"));
 175         at->task.error = 0;
 176         register_task(&sched, &at->task);
 177         i9e_attach_to_stdout(at->btrn);
 178         return 1;
 179 close:
 180         close(at->fd);
 181 out:
 182         free(args);
 183         return ret;
 184 }
 185
 186 __noreturn static void interactive_session(void)
 187 {
 188         int ret;
 189         char *history_file;
 190         struct sigaction act;
 191         struct i9e_client_info ici = {
 192                 .fds = {0, 1, 2},
 193                 .prompt = "para_audioc> ",
 194                 .line_handler = audioc_i9e_line_handler,
 195                 .loglevel = loglevel,
 196                 .completers = audiod_completers,
 197         };
 198         PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("audioc"));
 199         if (conf.history_file_given)
 200                 history_file = para_strdup(conf.history_file_arg);
 201         else {
 202                 char *home = para_homedir();
 203                 history_file = make_message("%s/.paraslash/audioc.history",
 204                         home);
 205                 free(home);
 206         }
 207         ici.history_file = history_file;
 208
 209         act.sa_handler = i9e_signal_dispatch;
 210         sigemptyset(&act.sa_mask);
 211         act.sa_flags = 0;
 212         sigaction(SIGINT, &act, NULL);
 213         sched.select_function = i9e_select;
 214
 215         sched.default_timeout.tv_sec = 1;
 216         ret = i9e_open(&ici, &sched);
 217         if (ret < 0)
 218                 goto out;
 219         para_log = i9e_log;
 220         ret = schedule(&sched);
 221         i9e_close();
 222         para_log = stderr_log;
 223 out:
 224         free(history_file);
 225         audioc_cmdline_parser_free(&conf);
 226         if (ret < 0)
 227                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 228         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 229 }
 230
 231 __noreturn static void print_completions(void)
 232 {
 233         int ret = i9e_print_completions(audiod_completers);
 234         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 235 }
 236
 237 #else /* HAVE_READLINE */
 238
 239 __noreturn static void interactive_session(void)
 240 {
 241         PARA_EMERG_LOG("interactive sessions not available\n");
 242         exit(EXIT_FAILURE);
 243 }
 244
 245 __noreturn static void print_completions(void)
 246 {
 247         PARA_EMERG_LOG("command completion not available\n");
 248         exit(EXIT_FAILURE);
 249 }
 250
 251 #endif /* HAVE_READLINE */
 252
 253 static char *configfile_exists(void)
 254 {
 255         static char *config_file;
 256         struct stat statbuf;
 257
 258         if (!config_file) {
 259                 char *home = para_homedir();
 260                 config_file = make_message("%s/.paraslash/audioc.conf", home);
 261                 free(home);
 262         }
 263         if (!stat(config_file, &statbuf))
 264                 return 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 creates a temporary local socket in order to communicate with para_audiod.
 275  * Authentication consists in sending a ucred buffer that contains the user id.
 276  *
 277  * Any output received through the local socket is sent to stdout.
 278  *
 279  * \return EXIT_SUCCESS or EXIT_FAILURE.
 280  *
 281  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
 282  */
 283 int main(int argc, char *argv[])
 284 {
 285         int ret = -E_AUDIOC_SYNTAX, fd;
 286         char *cf, *buf = NULL, *args;
 287         size_t bufsize;
 288
 289         if (audioc_cmdline_parser(argc, argv, &conf))
 290                 goto out;
 291         HANDLE_VERSION_FLAG("audioc", conf);
 292         cf = configfile_exists();
 293         if (cf) {
 294                 struct audioc_cmdline_parser_params params = {
 295                         .override = 0,
 296                         .initialize = 0,
 297                         .check_required = 0,
 298                         .check_ambiguity = 0
 299                 };
 300                 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
 301                         fprintf(stderr, "parse error in config file\n");
 302                         exit(EXIT_FAILURE);
 303                 }
 304         }
 305         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 306         if (conf.socket_given)
 307                 socket_name = para_strdup(conf.socket_arg);
 308         else {
 309                 char *hn = para_hostname();
 310                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 311                         hn);
 312                 free(hn);
 313         }
 314
 315         if (conf.complete_given)
 316                 print_completions();
 317
 318         if (conf.inputs_num == 0)
 319                 interactive_session();
 320         args = concat_args(conf.inputs_num, conf.inputs);
 321
 322         ret = connect_local_socket(socket_name);
 323         free(socket_name);
 324         if (ret < 0) {
 325                 PARA_EMERG_LOG("failed to connect to local socket\n");
 326                 goto out;
 327         }
 328         fd = ret;
 329         ret = send_cred_buffer(fd, args);
 330         if (ret < 0)
 331                 goto out;
 332         bufsize = conf.bufsize_arg;
 333         buf = para_malloc(bufsize);
 334         do {
 335                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 336                 if (ret <= 0)
 337                         break;
 338                 ret = write_all(STDOUT_FILENO, buf, &n);
 339         } while (ret >= 0);
 340 out:
 341         if (ret < 0)
 342                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 343         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 344 }