audioc: Switch to blocking file descriptors.
[paraslash.git] / audioc.c
1 /*
2 * Copyright (C) 2005-2010 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 <dirent.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
20 INIT_AUDIOC_ERRLISTS;
21
22 /** The gengetopt structure containing command line args. */
23 static struct audioc_args_info conf;
24
25 static int loglevel;
26 INIT_STDERR_LOGGING(loglevel);
27
28 static char *concat_args(unsigned argc, char * const *argv)
29 {
30 int i; char *buf = NULL;
31 for (i = 0; i < argc; i++) {
32 buf = para_strcat(buf, argv[i]);
33 if (i != argc - 1)
34 buf = para_strcat(buf, "\n");
35 }
36 return buf;
37 }
38
39 static char *configfile_exists(void)
40 {
41 static char *config_file;
42 struct stat statbuf;
43
44
45 if (!config_file) {
46 char *home = para_homedir();
47 config_file = make_message("%s/.paraslash/audioc.conf", home);
48 free(home);
49 }
50 if (!stat(config_file, &statbuf))
51 return config_file;
52 return NULL;
53 }
54
55 /**
56 * the client program to connect to para_audiod
57 *
58 * \param argc usual argument count
59 * \param argv usual argument vector
60 *
61 * It creates a temporary local socket in order to communicate with para_audiod.
62 * Authentication consists in sending a ucred buffer that contains the user id.
63 *
64 * Any output received through the local socket is sent to stdout.
65 *
66 * \return EXIT_SUCCESS or EXIT_FAILURE
67 *
68 * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
69 */
70 int main(int argc, char *argv[])
71 {
72 int ret = -E_AUDIOC_SYNTAX, fd;
73 char *cf, *buf = NULL, *args;
74 size_t bufsize;
75
76 if (audioc_cmdline_parser(argc, argv, &conf))
77 goto out;
78 HANDLE_VERSION_FLAG("audioc", conf);
79 cf = configfile_exists();
80 if (cf) {
81 struct audioc_cmdline_parser_params params = {
82 .override = 0,
83 .initialize = 0,
84 .check_required = 0,
85 .check_ambiguity = 0
86 };
87 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
88 fprintf(stderr, "parse error in config file\n");
89 exit(EXIT_FAILURE);
90 }
91 }
92 loglevel = get_loglevel_by_name(conf.loglevel_arg);
93 args = conf.inputs_num?
94 concat_args(conf.inputs_num, conf.inputs) :
95 para_strdup("stat");
96
97 if (conf.socket_given)
98 ret = create_remote_socket(conf.socket_arg);
99 else {
100 char *hn = para_hostname(), *socket_name = make_message(
101 "/var/paraslash/audiod_socket.%s", hn);
102 ret = create_remote_socket(socket_name);
103 free(hn);
104 free(socket_name);
105 }
106 if (ret < 0) {
107 PARA_EMERG_LOG("failed to create remote socket\n");
108 goto out;
109 }
110 fd = ret;
111 ret = send_cred_buffer(fd, args);
112 if (ret < 0)
113 goto out;
114 bufsize = conf.bufsize_arg;
115 buf = para_malloc(bufsize);
116 do {
117 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
118 if (ret <= 0)
119 break;
120 ret = write_all(STDOUT_FILENO, buf, &n);
121 } while (ret >= 0);
122 out:
123 if (ret < 0)
124 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
125 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
126 }