replace standard GPL header by a one-line pointer to COPYING
[paraslash.git] / audioc.c
1 /*
2 * Copyright (C) 2005-2007 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 "audioc.cmdline.h"
10 #include "para.h"
11 #include "net.h"
12 #include "string.h"
13 #include "fd.h"
14 #include "error.h"
15
16 INIT_AUDIOC_ERRLISTS;
17
18 /** the gengetopt structure containing command line args */
19 struct audioc_args_info conf;
20
21 INIT_STDERR_LOGGING(conf.loglevel_arg);
22
23 static char *concat_args(unsigned argc, char * const *argv)
24 {
25 int i; char *buf = NULL;
26 for (i = 0; i < argc; i++) {
27 buf = para_strcat(buf, argv[i]);
28 if (i != argc - 1)
29 buf = para_strcat(buf, "\n");
30 }
31 return buf;
32 }
33
34 static char *configfile_exists(void)
35 {
36 static char *config_file;
37 struct stat statbuf;
38
39
40 if (!config_file) {
41 char *home = para_homedir();
42 config_file = make_message("%s/.paraslash/audioc.conf", home);
43 free(home);
44 }
45 if (!stat(config_file, &statbuf))
46 return config_file;
47 return NULL;
48 }
49
50 /**
51 * the client program to connect to para_audiod
52 *
53 * \param argc usual argument count
54 * \param argv usual argument vector
55 *
56 * It creates a temporary local socket in order to communicate with para_audiod.
57 * Authentication consists in sending a ucred buffer that contains the user id.
58 *
59 * Any output received through the local socket is sent to stdout.
60 *
61 * \return EXIT_SUCCESS or EXIT_FAILURE
62 *
63 * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
64 */
65 int main(int argc, char *argv[])
66 {
67 struct sockaddr_un unix_addr;
68 int ret = -E_AUDIOC_SYNTAX, fd;
69 char *cf, *socket_name, *randname = para_tmpname(), *tmpsocket_name = NULL,
70 *buf = NULL, *hn = para_hostname(), *args, *home = para_homedir();
71 size_t bufsize = conf.bufsize_arg, loaded = 0;
72
73 if (audioc_cmdline_parser(argc, argv, &conf))
74 goto out;
75 HANDLE_VERSION_FLAG("audioc", conf);
76 cf = configfile_exists();
77 if (cf) {
78 if (audioc_cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
79 fprintf(stderr, "parse error in config file\n");
80 exit(EXIT_FAILURE);
81 }
82 }
83 args = conf.inputs_num?
84 concat_args(conf.inputs_num, conf.inputs) :
85 para_strdup("stat");
86 buf = para_malloc(bufsize);
87 if (conf.socket_given)
88 socket_name = para_strdup(conf.socket_arg);
89 else
90 socket_name = make_message(
91 "/var/paraslash/audiod_socket.%s", hn);
92 if (conf.tmpdir_given)
93 tmpsocket_name = make_message("%s/audioc.sock.%s.%s",
94 conf.tmpdir_arg, hn, randname);
95 else
96 tmpsocket_name = make_message("%s/.paraslash/audioc_sock.%s.%s",
97 home, hn, randname);
98
99 ret = create_pf_socket(tmpsocket_name, &unix_addr, S_IRUSR | S_IWUSR);
100 unlink(tmpsocket_name);
101 if (ret < 0)
102 goto out;
103 fd = ret;
104 ret = -E_INIT_SOCK_ADDR;
105 if (init_unix_addr(&unix_addr, socket_name) < 0)
106 goto out;
107 ret = -E_AUDIOC_CONNECT;
108 if (connect(fd, (struct sockaddr *)&unix_addr, UNIX_PATH_MAX) < 0)
109 goto out;
110 ret = send_cred_buffer(fd, args);
111 if (ret < 0)
112 goto out;
113 for (;;) {
114 int max_fileno = -1, check_write = 0;
115 ssize_t len;
116 fd_set rfd, wfd;
117 FD_ZERO(&rfd);
118 FD_ZERO(&wfd);
119 if (loaded < bufsize)
120 para_fd_set(fd, &rfd, &max_fileno);
121 if (loaded > 0) {
122 para_fd_set(STDOUT_FILENO, &wfd, &max_fileno);
123 check_write = 1;
124 }
125 ret = -E_AUDIOC_OVERRUN;
126 if (max_fileno < 0)
127 goto out;
128 ret = para_select(max_fileno + 1, &rfd, &wfd, NULL);
129 if (ret < 0)
130 goto out;
131 if (loaded < bufsize && FD_ISSET(fd, &rfd)) {
132 len = recv_bin_buffer(fd, buf + loaded,
133 bufsize - loaded);
134 if (len <= 0) {
135 ret = len < 0? -E_AUDIOC_READ : 0;
136 goto out;
137 }
138 loaded += len;
139 }
140 if (check_write && FD_ISSET(STDOUT_FILENO, &wfd)) {
141 ret = write(STDOUT_FILENO, buf, loaded);
142 if (ret < 0) {
143 ret = -E_AUDIOC_WRITE;
144 goto out;
145 }
146 loaded -= ret;
147 }
148 }
149 out:
150 if (!ret && loaded && buf)
151 ret = write(STDOUT_FILENO, buf, loaded);
152 if (ret < 0)
153 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
154 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
155 }