Simplify i9e_line_handler.
[paraslash.git] / audioc.c
1 /*
2 * Copyright (C) 2005-2013 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 static int connect_audiod(const char *sname, char *args)
46 {
47 int fd = -1, ret;
48
49 ret = connect_local_socket(sname);
50 if (ret < 0)
51 goto fail;
52 fd = ret;
53 ret = send_cred_buffer(fd, args);
54 if (ret < 0)
55 goto fail;
56 return fd;
57 fail:
58 PARA_ERROR_LOG("could not connect %s\n", sname);
59 if (fd >= 0)
60 close(fd);
61 return ret;
62 }
63
64 #ifdef HAVE_READLINE
65 #include "list.h"
66 #include "sched.h"
67 #include "buffer_tree.h"
68 #include "interactive.h"
69 #include "audiod_completion.h"
70
71 static struct sched sched;
72
73 struct audioc_task {
74 int fd;
75 struct btr_node *btrn;
76 struct task task;
77 };
78
79 static struct i9e_completer audiod_completers[];
80
81 I9E_DUMMY_COMPLETER(cycle);
82 I9E_DUMMY_COMPLETER(off);
83 I9E_DUMMY_COMPLETER(on);
84 I9E_DUMMY_COMPLETER(sb);
85 I9E_DUMMY_COMPLETER(tasks);
86 I9E_DUMMY_COMPLETER(term);
87
88 static void help_completer(struct i9e_completion_info *ci,
89 struct i9e_completion_result *result)
90 {
91 result->matches = i9e_complete_commands(ci->word, audiod_completers);
92 }
93
94 static void stat_completer(struct i9e_completion_info *ci,
95 struct i9e_completion_result *cr)
96 {
97 char *sia[] = {STATUS_ITEM_ARRAY NULL};
98 char *opts[] = {"-p", NULL};
99
100 if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
101 i9e_complete_option(opts, ci, cr);
102 else
103 i9e_extract_completions(ci->word, sia, &cr->matches);
104 }
105
106 static void grab_completer(struct i9e_completion_info *ci,
107 struct i9e_completion_result *cr)
108 {
109 char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
110 i9e_complete_option(opts, ci, cr);
111 }
112
113 static struct i9e_completer audiod_completers[] = {
114 AUDIOD_COMPLETERS
115 {.name = NULL}
116 };
117
118 static void audioc_pre_select(struct sched *s, struct task *t)
119 {
120 struct audioc_task *at = container_of(t, struct audioc_task, task);
121 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
122
123 if (ret < 0)
124 sched_min_delay(s);
125 para_fd_set(at->fd, &s->rfds, &s->max_fileno);
126 }
127
128 static int audioc_post_select(struct sched *s, struct task *t)
129 {
130 char *buf = NULL;
131 struct audioc_task *at = container_of(t, struct audioc_task, task);
132 int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
133
134 if (ret < 0)
135 goto out;
136 if (!FD_ISSET(at->fd, &s->rfds))
137 return 0;
138 buf = para_malloc(conf.bufsize_arg);
139 ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
140 PARA_DEBUG_LOG("recv: %d\n", ret);
141 if (ret == 0)
142 ret = -E_AUDIOC_EOF;
143 if (ret < 0)
144 goto out;
145 btr_add_output(buf, ret, at->btrn);
146 return 0;
147 out:
148 if (ret < 0) {
149 free(buf);
150 btr_remove_node(&at->btrn);
151 close(at->fd);
152 }
153 return ret;
154 }
155
156 static struct audioc_task audioc_task = {
157 .task = {
158 .pre_select = audioc_pre_select,
159 .post_select = audioc_post_select,
160 .status = "audioc task"
161 },
162 }, *at = &audioc_task;
163
164 static int audioc_i9e_line_handler(char *line)
165 {
166 char *args = NULL;
167 int ret;
168
169 PARA_DEBUG_LOG("line: %s\n", line);
170 ret = create_argv(line, " ", &conf.inputs);
171 if (ret < 0)
172 return ret;
173 conf.inputs_num = ret;
174 args = concat_args(conf.inputs_num, conf.inputs);
175 free_argv(conf.inputs);
176 conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
177 ret = connect_audiod(socket_name, args);
178 if (ret < 0)
179 goto out;
180 at->fd = ret;
181 ret = mark_fd_nonblocking(at->fd);
182 if (ret < 0)
183 goto close;
184 free(args);
185 args = NULL;
186 at->btrn = btr_new_node(&(struct btr_node_description)
187 EMBRACE(.name = "audioc line handler"));
188 at->task.error = 0;
189 register_task(&sched, &at->task);
190 i9e_attach_to_stdout(at->btrn);
191 return 1;
192 close:
193 close(at->fd);
194 out:
195 free(args);
196 return ret;
197 }
198
199 __noreturn static void interactive_session(void)
200 {
201 int ret;
202 char *history_file;
203 struct sigaction act;
204 struct i9e_client_info ici = {
205 .fds = {0, 1, 2},
206 .prompt = "para_audioc> ",
207 .line_handler = audioc_i9e_line_handler,
208 .loglevel = loglevel,
209 .completers = audiod_completers,
210 };
211 PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("audioc"));
212 if (conf.history_file_given)
213 history_file = para_strdup(conf.history_file_arg);
214 else {
215 char *home = para_homedir();
216 history_file = make_message("%s/.paraslash/audioc.history",
217 home);
218 free(home);
219 }
220 ici.history_file = history_file;
221
222 act.sa_handler = i9e_signal_dispatch;
223 sigemptyset(&act.sa_mask);
224 act.sa_flags = 0;
225 sigaction(SIGINT, &act, NULL);
226 sched.select_function = i9e_select;
227
228 sched.default_timeout.tv_sec = 1;
229 ret = i9e_open(&ici, &sched);
230 if (ret < 0)
231 goto out;
232 para_log = i9e_log;
233 ret = schedule(&sched);
234 i9e_close();
235 para_log = stderr_log;
236 out:
237 free(history_file);
238 audioc_cmdline_parser_free(&conf);
239 if (ret < 0)
240 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
241 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
242 }
243
244 __noreturn static void print_completions(void)
245 {
246 int ret = i9e_print_completions(audiod_completers);
247 exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
248 }
249
250 #else /* HAVE_READLINE */
251
252 __noreturn static void interactive_session(void)
253 {
254 PARA_EMERG_LOG("interactive sessions not available\n");
255 exit(EXIT_FAILURE);
256 }
257
258 __noreturn static void print_completions(void)
259 {
260 PARA_EMERG_LOG("command completion not available\n");
261 exit(EXIT_FAILURE);
262 }
263
264 #endif /* HAVE_READLINE */
265
266 static char *configfile_exists(void)
267 {
268 char *config_file;
269 struct stat statbuf;
270 char *home = para_homedir();
271
272 config_file = make_message("%s/.paraslash/audioc.conf", home);
273 free(home);
274 if (!stat(config_file, &statbuf))
275 return config_file;
276 free(config_file);
277 return NULL;
278 }
279
280 /**
281 * The client program to connect to para_audiod.
282 *
283 * \param argc Usual argument count.
284 * \param argv Usual argument vector.
285 *
286 * It connects to the "well-known" local socket to communicate with
287 * para_audiod. Authentication is performed by sending a ucred buffer
288 * containing the user id to the local socket.
289 *
290 * Any data received from the socket is written to stdout.
291 *
292 * \return EXIT_SUCCESS or EXIT_FAILURE.
293 *
294 * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
295 */
296 int main(int argc, char *argv[])
297 {
298 int ret = -E_AUDIOC_SYNTAX, fd;
299 char *cf, *buf = NULL, *args = NULL;
300 size_t bufsize;
301
302 if (audioc_cmdline_parser(argc, argv, &conf))
303 goto out;
304 HANDLE_VERSION_FLAG("audioc", conf);
305 cf = configfile_exists();
306 if (cf) {
307 struct audioc_cmdline_parser_params params = {
308 .override = 0,
309 .initialize = 0,
310 .check_required = 0,
311 .check_ambiguity = 0
312 };
313 ret = audioc_cmdline_parser_config_file(cf, &conf, &params);
314 free(cf);
315 if (ret) {
316 fprintf(stderr, "parse error in config file\n");
317 exit(EXIT_FAILURE);
318 }
319 }
320 loglevel = get_loglevel_by_name(conf.loglevel_arg);
321 if (conf.socket_given)
322 socket_name = para_strdup(conf.socket_arg);
323 else {
324 char *hn = para_hostname();
325 socket_name = make_message("/var/paraslash/audiod_socket.%s",
326 hn);
327 free(hn);
328 }
329
330 if (conf.complete_given)
331 print_completions();
332
333 if (conf.inputs_num == 0)
334 interactive_session();
335 args = concat_args(conf.inputs_num, conf.inputs);
336
337 ret = connect_audiod(socket_name, args);
338 free(socket_name);
339 if (ret < 0)
340 goto out;
341 fd = ret;
342 ret = mark_fd_blocking(STDOUT_FILENO);
343 if (ret < 0)
344 goto out;
345 bufsize = conf.bufsize_arg;
346 buf = para_malloc(bufsize);
347 do {
348 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
349 if (ret <= 0)
350 break;
351 ret = write_all(STDOUT_FILENO, buf, n);
352 } while (ret >= 0);
353 out:
354 free(buf);
355 free(args);
356 if (ret < 0)
357 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
358 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
359 }