mixer: fade: Handle empty mood strings gracefully.
[paraslash.git] / audioc.c
1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file audioc.c The client program used to connect to para_audiod. */
4
5 #include <netinet/in.h>
6 #include <sys/socket.h>
7 #include <regex.h>
8 #include <sys/types.h>
9 #include <arpa/inet.h>
10 #include <sys/un.h>
11 #include <netdb.h>
12 #include <signal.h>
13 #include <lopsub.h>
14
15 #include "audiod_cmd.lsg.h"
16 #include "audioc.lsg.h"
17
18 #include "para.h"
19 #include "error.h"
20 #include "lsu.h"
21 #include "net.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "version.h"
25
26 /** Array of error strings. */
27 DEFINE_PARA_ERRLIST;
28
29 static char *socket_name;
30 static struct lls_parse_result *lpr;
31
32 #define CMD_PTR (lls_cmd(0, audioc_suite))
33 #define OPT_RESULT(_name) \
34 (lls_opt_result(LSG_AUDIOC_PARA_AUDIOC_OPT_ ## _name, lpr))
35 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
36 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
37 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
38
39 static int loglevel;
40 INIT_STDERR_LOGGING(loglevel);
41
42 static char *concat_args(unsigned argc, char * const *argv)
43 {
44 int i;
45 char *buf = NULL;
46
47 for (i = 0; i < argc; i++) {
48 const char *arg = argv? argv[i] : lls_input(i, lpr);
49 buf = para_strcat(buf, arg);
50 if (i != argc - 1)
51 buf = para_strcat(buf, "\n");
52 }
53 return buf;
54 }
55
56 static int connect_audiod(const char *sname, char *args)
57 {
58 int fd = -1, ret;
59
60 ret = connect_local_socket(sname);
61 if (ret < 0)
62 goto fail;
63 fd = ret;
64 ret = send_cred_buffer(fd, args);
65 if (ret < 0)
66 goto fail;
67 return fd;
68 fail:
69 PARA_ERROR_LOG("could not connect %s\n", sname);
70 if (fd >= 0)
71 close(fd);
72 return ret;
73 }
74
75 #ifdef HAVE_READLINE
76 #include "list.h"
77 #include "sched.h"
78 #include "buffer_tree.h"
79 #include "interactive.h"
80
81 static struct sched sched;
82
83 struct audioc_task {
84 int fd;
85 struct btr_node *btrn;
86 struct task *task;
87 };
88
89 static struct i9e_completer audiod_completers[];
90
91 I9E_DUMMY_COMPLETER(cycle);
92 I9E_DUMMY_COMPLETER(off);
93 I9E_DUMMY_COMPLETER(on);
94 I9E_DUMMY_COMPLETER(sb);
95 I9E_DUMMY_COMPLETER(tasks);
96 I9E_DUMMY_COMPLETER(term);
97
98 static void help_completer(struct i9e_completion_info *ci,
99 struct i9e_completion_result *cr)
100 {
101 char *opts[] = {LSG_AUDIOD_CMD_HELP_OPTS, NULL};
102
103 if (ci->word[0] == '-') {
104 i9e_complete_option(opts, ci, cr);
105 return;
106 }
107 cr->matches = i9e_complete_commands(ci->word, audiod_completers);
108 }
109
110 static void version_completer(struct i9e_completion_info *ci,
111 struct i9e_completion_result *cr)
112 {
113 char *opts[] = {LSG_AUDIOD_CMD_VERSION_OPTS, NULL};
114
115 if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
116 i9e_complete_option(opts, ci, cr);
117 }
118
119 static void stat_completer(struct i9e_completion_info *ci,
120 struct i9e_completion_result *cr)
121 {
122 char *sia[] = {STATUS_ITEMS NULL};
123 char *opts[] = {LSG_AUDIOD_CMD_STAT_OPTS, NULL};
124
125 if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
126 i9e_complete_option(opts, ci, cr);
127 else
128 i9e_extract_completions(ci->word, sia, &cr->matches);
129 }
130
131 static void grab_completer(struct i9e_completion_info *ci,
132 struct i9e_completion_result *cr)
133 {
134 char *opts[] = {LSG_AUDIOD_CMD_GRAB_OPTS, NULL};
135 i9e_complete_option(opts, ci, cr);
136 }
137
138 static struct i9e_completer audiod_completers[] = {
139 #define LSG_AUDIOD_CMD_CMD(_name) {.name = #_name, \
140 .completer = _name ## _completer}
141 LSG_AUDIOD_CMD_SUBCOMMANDS
142 #undef LSG_AUDIOD_CMD_CMD
143 {.name = NULL}
144 };
145
146 static void audioc_pre_select(struct sched *s, void *context)
147 {
148 struct audioc_task *at = context;
149 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
150
151 if (ret < 0)
152 sched_min_delay(s);
153 para_fd_set(at->fd, &s->rfds, &s->max_fileno);
154 }
155
156 static int audioc_post_select(struct sched *s, void *context)
157 {
158 char *buf = NULL;
159 struct audioc_task *at = context;
160 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
161 size_t bufsize;
162
163 if (ret < 0)
164 goto out;
165 if (!FD_ISSET(at->fd, &s->rfds))
166 return 0;
167 bufsize = PARA_MAX(1024U, OPT_UINT32_VAL(BUFSIZE));
168 buf = para_malloc(bufsize);
169 ret = recv_bin_buffer(at->fd, buf, bufsize);
170 PARA_DEBUG_LOG("recv: %d\n", ret);
171 if (ret == 0)
172 ret = -E_AUDIOC_EOF;
173 if (ret < 0)
174 goto out;
175 btr_add_output(buf, ret, at->btrn);
176 return 0;
177 out:
178 if (ret < 0) {
179 free(buf);
180 btr_remove_node(&at->btrn);
181 close(at->fd);
182 }
183 return ret;
184 }
185
186 static struct audioc_task audioc_task, *at = &audioc_task;
187
188 static int audioc_i9e_line_handler(char *line)
189 {
190 int argc, ret;
191 char *args, **argv;
192
193 PARA_DEBUG_LOG("line: %s\n", line);
194 ret = create_argv(line, " ", &argv);
195 if (ret < 0)
196 return ret;
197 argc = ret;
198 args = concat_args(argc, argv);
199 free_argv(argv);
200 if (!args)
201 return 0;
202 ret = connect_audiod(socket_name, args);
203 free(args);
204 if (ret < 0)
205 return ret;
206 at->fd = ret;
207 ret = mark_fd_nonblocking(at->fd);
208 if (ret < 0)
209 goto close;
210 at->btrn = btr_new_node(&(struct btr_node_description)
211 EMBRACE(.name = "audioc line handler"));
212 at->task = task_register(&(struct task_info) {
213 .name = "audioc",
214 .pre_select = audioc_pre_select,
215 .post_select = audioc_post_select,
216 .context = at,
217 }, &sched);
218 i9e_attach_to_stdout(at->btrn);
219 return 1;
220 close:
221 close(at->fd);
222 return ret;
223 }
224
225 __noreturn static void interactive_session(void)
226 {
227 int ret;
228 char *history_file;
229 struct sigaction act;
230 struct i9e_client_info ici = {
231 .fds = {0, 1, 2},
232 .prompt = "para_audioc> ",
233 .line_handler = audioc_i9e_line_handler,
234 .loglevel = loglevel,
235 .completers = audiod_completers,
236 };
237
238 PARA_NOTICE_LOG("\n%s\n", version_text("audioc"));
239 if (OPT_GIVEN(HISTORY_FILE))
240 history_file = para_strdup(OPT_STRING_VAL(HISTORY_FILE));
241 else {
242 char *home = para_homedir();
243 history_file = make_message("%s/.paraslash/audioc.history",
244 home);
245 free(home);
246 }
247 ici.history_file = history_file;
248
249 act.sa_handler = i9e_signal_dispatch;
250 sigemptyset(&act.sa_mask);
251 act.sa_flags = 0;
252 sigaction(SIGINT, &act, NULL);
253 sched.select_function = i9e_select;
254
255 sched.default_timeout.tv_sec = 1;
256 ret = i9e_open(&ici, &sched);
257 if (ret < 0)
258 goto out;
259 para_log = i9e_log;
260 ret = schedule(&sched);
261 sched_shutdown(&sched);
262 i9e_close();
263 para_log = stderr_log;
264 out:
265 free(history_file);
266 free(socket_name);
267 if (ret < 0)
268 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
269 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
270 }
271
272 __noreturn static void print_completions(void)
273 {
274 int ret = i9e_print_completions(audiod_completers);
275 exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
276 }
277
278 #else /* HAVE_READLINE */
279
280 __noreturn static void interactive_session(void)
281 {
282 PARA_EMERG_LOG("interactive sessions not available\n");
283 exit(EXIT_FAILURE);
284 }
285
286 __noreturn static void print_completions(void)
287 {
288 PARA_EMERG_LOG("command completion not available\n");
289 exit(EXIT_FAILURE);
290 }
291
292 #endif /* HAVE_READLINE */
293
294 static void handle_help_flag(void)
295 {
296 char *help;
297
298 if (OPT_GIVEN(DETAILED_HELP))
299 help = lls_long_help(CMD_PTR);
300 else if (OPT_GIVEN(HELP))
301 help = lls_short_help(CMD_PTR);
302 else
303 return;
304 printf("%s\n", help);
305 free(help);
306 exit(EXIT_SUCCESS);
307 }
308
309 /**
310 * The client program to connect to para_audiod.
311 *
312 * \param argc Usual argument count.
313 * \param argv Usual argument vector.
314 *
315 * It connects to the "well-known" local socket to communicate with
316 * para_audiod. Authentication is performed by sending a ucred buffer
317 * containing the user id to the local socket.
318 *
319 * Any data received from the socket is written to stdout.
320 *
321 * \return EXIT_SUCCESS or EXIT_FAILURE.
322 *
323 * \sa \ref send_cred_buffer(), para_audioc(1), para_audiod(1).
324 */
325 int main(int argc, char *argv[])
326 {
327 int ret, fd;
328 char *buf, *args, *errctx = NULL;
329 size_t bufsize;
330 unsigned num_inputs;
331
332 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
333 if (ret < 0)
334 goto fail;
335 version_handle_flag("audioc", OPT_GIVEN(VERSION));
336 handle_help_flag();
337 ret = lsu_merge_config_file_options(NULL, "audioc.conf",
338 &lpr, CMD_PTR, audioc_suite, 0 /* default flags */);
339 if (ret < 0)
340 goto fail;
341 loglevel = OPT_UINT32_VAL(LOGLEVEL);
342 if (OPT_GIVEN(COMPLETE))
343 print_completions();
344 if (OPT_GIVEN(SOCKET))
345 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
346 else {
347 char *hn = para_hostname();
348 socket_name = make_message("/var/paraslash/audiod_socket.%s",
349 hn);
350 free(hn);
351 }
352 num_inputs = lls_num_inputs(lpr);
353 if (num_inputs == 0)
354 interactive_session();
355
356 args = concat_args(num_inputs, NULL);
357 ret = connect_audiod(socket_name, args);
358 free(socket_name);
359 free(args);
360 if (ret < 0)
361 goto out;
362 fd = ret;
363 ret = mark_fd_blocking(STDOUT_FILENO);
364 if (ret < 0)
365 goto out;
366 bufsize = PARA_MAX(1024U, OPT_UINT32_VAL(BUFSIZE));
367 buf = para_malloc(bufsize);
368 do {
369 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
370 if (ret <= 0)
371 break;
372 ret = write_all(STDOUT_FILENO, buf, n);
373 } while (ret >= 0);
374 free(buf);
375 out:
376 lls_free_parse_result(lpr, CMD_PTR);
377 fail:
378 if (errctx)
379 PARA_ERROR_LOG("%s\n", errctx);
380 free(errctx);
381 if (ret < 0)
382 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
383 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
384 }