d9478ab9c6596cad31dc8e31950dcb0a428adbbb
[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 "net.h"
21 #include "string.h"
22 #include "fd.h"
23 #include "version.h"
24
25 /** Array of error strings. */
26 DEFINE_PARA_ERRLIST;
27
28 static char *socket_name;
29 static struct lls_parse_result *lpr;
30
31 #define CMD_PTR (lls_cmd(0, audioc_suite))
32 #define OPT_RESULT(_name) \
33 (lls_opt_result(LSG_AUDIOC_PARA_AUDIOC_OPT_ ## _name, lpr))
34 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
35 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
36 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
37
38 static int loglevel;
39 INIT_STDERR_LOGGING(loglevel);
40
41 static char *concat_args(unsigned argc, char * const *argv)
42 {
43 int i;
44 char *buf = NULL;
45
46 for (i = 0; i < argc; i++) {
47 const char *arg = argv? argv[i] : lls_input(i, lpr);
48 buf = para_strcat(buf, arg);
49 if (i != argc - 1)
50 buf = para_strcat(buf, "\n");
51 }
52 return buf;
53 }
54
55 static int connect_audiod(const char *sname, char *args)
56 {
57 int fd = -1, ret;
58
59 ret = connect_local_socket(sname);
60 if (ret < 0)
61 goto fail;
62 fd = ret;
63 ret = send_cred_buffer(fd, args);
64 if (ret < 0)
65 goto fail;
66 return fd;
67 fail:
68 PARA_ERROR_LOG("could not connect %s\n", sname);
69 if (fd >= 0)
70 close(fd);
71 return ret;
72 }
73
74 #ifdef HAVE_READLINE
75 #include "list.h"
76 #include "sched.h"
77 #include "buffer_tree.h"
78 #include "interactive.h"
79
80 static struct sched sched;
81
82 struct audioc_task {
83 int fd;
84 struct btr_node *btrn;
85 struct task *task;
86 };
87
88 static struct i9e_completer audiod_completers[];
89
90 I9E_DUMMY_COMPLETER(cycle);
91 I9E_DUMMY_COMPLETER(off);
92 I9E_DUMMY_COMPLETER(on);
93 I9E_DUMMY_COMPLETER(sb);
94 I9E_DUMMY_COMPLETER(tasks);
95 I9E_DUMMY_COMPLETER(term);
96
97 static void help_completer(struct i9e_completion_info *ci,
98 struct i9e_completion_result *result)
99 {
100 char *opts[] = {LSG_AUDIOD_CMD_HELP_OPTS, NULL};
101
102 if (ci->word[0] == '-') {
103 i9e_complete_option(opts, ci, result);
104 return;
105 }
106 result->matches = i9e_complete_commands(ci->word, audiod_completers);
107 }
108
109 static void version_completer(struct i9e_completion_info *ci,
110 struct i9e_completion_result *cr)
111 {
112 char *opts[] = {LSG_AUDIOD_CMD_VERSION_OPTS, NULL};
113
114 if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
115 i9e_complete_option(opts, ci, cr);
116 }
117
118 static void stat_completer(struct i9e_completion_info *ci,
119 struct i9e_completion_result *cr)
120 {
121 char *sia[] = {STATUS_ITEMS NULL};
122 char *opts[] = {LSG_AUDIOD_CMD_STAT_OPTS, NULL};
123
124 if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
125 i9e_complete_option(opts, ci, cr);
126 else
127 i9e_extract_completions(ci->word, sia, &cr->matches);
128 }
129
130 static void grab_completer(struct i9e_completion_info *ci,
131 struct i9e_completion_result *cr)
132 {
133 char *opts[] = {LSG_AUDIOD_CMD_GRAB_OPTS, NULL};
134 i9e_complete_option(opts, ci, cr);
135 }
136
137 static struct i9e_completer audiod_completers[] = {
138 #define LSG_AUDIOD_CMD_CMD(_name) {.name = #_name, \
139 .completer = _name ## _completer}
140 LSG_AUDIOD_CMD_SUBCOMMANDS
141 #undef LSG_AUDIOD_CMD_CMD
142 {.name = NULL}
143 };
144
145 static void audioc_pre_select(struct sched *s, void *context)
146 {
147 struct audioc_task *at = context;
148 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
149
150 if (ret < 0)
151 sched_min_delay(s);
152 para_fd_set(at->fd, &s->rfds, &s->max_fileno);
153 }
154
155 static int audioc_post_select(struct sched *s, void *context)
156 {
157 char *buf = NULL;
158 struct audioc_task *at = context;
159 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
160 size_t bufsize;
161
162 if (ret < 0)
163 goto out;
164 if (!FD_ISSET(at->fd, &s->rfds))
165 return 0;
166 bufsize = PARA_MAX(1024U, OPT_UINT32_VAL(BUFSIZE));
167 buf = para_malloc(bufsize);
168 ret = recv_bin_buffer(at->fd, buf, bufsize);
169 PARA_DEBUG_LOG("recv: %d\n", ret);
170 if (ret == 0)
171 ret = -E_AUDIOC_EOF;
172 if (ret < 0)
173 goto out;
174 btr_add_output(buf, ret, at->btrn);
175 return 0;
176 out:
177 if (ret < 0) {
178 free(buf);
179 btr_remove_node(&at->btrn);
180 close(at->fd);
181 }
182 return ret;
183 }
184
185 static struct audioc_task audioc_task, *at = &audioc_task;
186
187 static int audioc_i9e_line_handler(char *line)
188 {
189 int argc, ret;
190 char *args, **argv;
191
192 PARA_DEBUG_LOG("line: %s\n", line);
193 ret = create_argv(line, " ", &argv);
194 if (ret < 0)
195 return ret;
196 argc = ret;
197 args = concat_args(argc, argv);
198 free_argv(argv);
199 if (!args)
200 return 0;
201 ret = connect_audiod(socket_name, args);
202 free(args);
203 if (ret < 0)
204 return ret;
205 at->fd = ret;
206 ret = mark_fd_nonblocking(at->fd);
207 if (ret < 0)
208 goto close;
209 at->btrn = btr_new_node(&(struct btr_node_description)
210 EMBRACE(.name = "audioc line handler"));
211 at->task = task_register(&(struct task_info) {
212 .name = "audioc",
213 .pre_select = audioc_pre_select,
214 .post_select = audioc_post_select,
215 .context = at,
216 }, &sched);
217 i9e_attach_to_stdout(at->btrn);
218 return 1;
219 close:
220 close(at->fd);
221 return ret;
222 }
223
224 __noreturn static void interactive_session(void)
225 {
226 int ret;
227 char *history_file;
228 struct sigaction act;
229 struct i9e_client_info ici = {
230 .fds = {0, 1, 2},
231 .prompt = "para_audioc> ",
232 .line_handler = audioc_i9e_line_handler,
233 .loglevel = loglevel,
234 .completers = audiod_completers,
235 };
236
237 PARA_NOTICE_LOG("\n%s\n", version_text("audioc"));
238 if (OPT_GIVEN(HISTORY_FILE))
239 history_file = para_strdup(OPT_STRING_VAL(HISTORY_FILE));
240 else {
241 char *home = para_homedir();
242 history_file = make_message("%s/.paraslash/audioc.history",
243 home);
244 free(home);
245 }
246 ici.history_file = history_file;
247
248 act.sa_handler = i9e_signal_dispatch;
249 sigemptyset(&act.sa_mask);
250 act.sa_flags = 0;
251 sigaction(SIGINT, &act, NULL);
252 sched.select_function = i9e_select;
253
254 sched.default_timeout.tv_sec = 1;
255 ret = i9e_open(&ici, &sched);
256 if (ret < 0)
257 goto out;
258 para_log = i9e_log;
259 ret = schedule(&sched);
260 sched_shutdown(&sched);
261 i9e_close();
262 para_log = stderr_log;
263 out:
264 free(history_file);
265 free(socket_name);
266 if (ret < 0)
267 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
268 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
269 }
270
271 __noreturn static void print_completions(void)
272 {
273 int ret = i9e_print_completions(audiod_completers);
274 exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
275 }
276
277 #else /* HAVE_READLINE */
278
279 __noreturn static void interactive_session(void)
280 {
281 PARA_EMERG_LOG("interactive sessions not available\n");
282 exit(EXIT_FAILURE);
283 }
284
285 __noreturn static void print_completions(void)
286 {
287 PARA_EMERG_LOG("command completion not available\n");
288 exit(EXIT_FAILURE);
289 }
290
291 #endif /* HAVE_READLINE */
292
293 static char *configfile_exists(void)
294 {
295 char *config_file;
296 char *home = para_homedir();
297
298 config_file = make_message("%s/.paraslash/audioc.conf", home);
299 free(home);
300 if (file_exists(config_file))
301 return config_file;
302 free(config_file);
303 return NULL;
304 }
305
306 static void handle_help_flag(void)
307 {
308 char *help;
309
310 if (OPT_GIVEN(DETAILED_HELP))
311 help = lls_long_help(CMD_PTR);
312 else if (OPT_GIVEN(HELP))
313 help = lls_short_help(CMD_PTR);
314 else
315 return;
316 printf("%s\n", help);
317 free(help);
318 exit(EXIT_SUCCESS);
319 }
320
321 /**
322 * The client program to connect to para_audiod.
323 *
324 * \param argc Usual argument count.
325 * \param argv Usual argument vector.
326 *
327 * It connects to the "well-known" local socket to communicate with
328 * para_audiod. Authentication is performed by sending a ucred buffer
329 * containing the user id to the local socket.
330 *
331 * Any data received from the socket is written to stdout.
332 *
333 * \return EXIT_SUCCESS or EXIT_FAILURE.
334 *
335 * \sa \ref send_cred_buffer(), para_audioc(1), para_audiod(1).
336 */
337 int main(int argc, char *argv[])
338 {
339 const struct lls_command *cmd = CMD_PTR;
340 int ret, fd;
341 char *cf = NULL, *buf, *args, *errctx = NULL;
342 size_t bufsize;
343 struct lls_parse_result *lpr1, *lpr2, *lpr3;
344 unsigned num_inputs;
345
346 ret = lls(lls_parse(argc, argv, cmd, &lpr1, &errctx));
347 if (ret < 0)
348 goto fail;
349 lpr = lpr1;
350 loglevel = OPT_UINT32_VAL(LOGLEVEL);
351 version_handle_flag("audioc", OPT_GIVEN(VERSION));
352 handle_help_flag();
353 cf = configfile_exists();
354 if (cf) {
355 void *map;
356 size_t sz;
357 int cf_argc;
358 char **cf_argv;
359 ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
360 if (ret != -E_EMPTY) {
361 if (ret < 0)
362 goto out;
363 ret = lls(lls_convert_config(map, sz, NULL, &cf_argv,
364 &errctx));
365 para_munmap(map, sz);
366 if (ret < 0) {
367 PARA_ERROR_LOG("syntax error in %s\n", cf);
368 goto out;
369 }
370 cf_argc = ret;
371 ret = lls(lls_parse(cf_argc, cf_argv, cmd, &lpr2,
372 &errctx));
373 lls_free_argv(cf_argv);
374 if (ret < 0) {
375 PARA_ERROR_LOG("parse error in %s\n", cf);
376 goto out;
377 }
378 ret = lls(lls_merge(lpr1, lpr2, cmd, &lpr3, &errctx));
379 lls_free_parse_result(lpr2, cmd);
380 if (ret < 0)
381 goto out;
382 lls_free_parse_result(lpr1, cmd);
383 lpr = lpr3;
384 loglevel = OPT_UINT32_VAL(LOGLEVEL);
385 }
386 }
387 if (OPT_GIVEN(COMPLETE))
388 print_completions();
389 if (OPT_GIVEN(SOCKET))
390 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
391 else {
392 char *hn = para_hostname();
393 socket_name = make_message("/var/paraslash/audiod_socket.%s",
394 hn);
395 free(hn);
396 }
397 num_inputs = lls_num_inputs(lpr);
398 if (num_inputs == 0)
399 interactive_session();
400
401 args = concat_args(num_inputs, NULL);
402 ret = connect_audiod(socket_name, args);
403 free(socket_name);
404 free(args);
405 if (ret < 0)
406 goto out;
407 fd = ret;
408 ret = mark_fd_blocking(STDOUT_FILENO);
409 if (ret < 0)
410 goto out;
411 bufsize = PARA_MAX(1024U, OPT_UINT32_VAL(BUFSIZE));
412 buf = para_malloc(bufsize);
413 do {
414 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
415 if (ret <= 0)
416 break;
417 ret = write_all(STDOUT_FILENO, buf, n);
418 } while (ret >= 0);
419 free(buf);
420 out:
421 lls_free_parse_result(lpr, cmd);
422 free(cf);
423 fail:
424 if (errctx)
425 PARA_ERROR_LOG("%s\n", errctx);
426 free(errctx);
427 if (ret < 0)
428 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
429 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
430 }