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 "error.h"
  12 #include "net.h"
  13 #include "string.h"
  14 #include "fd.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, 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                 struct audioc_cmdline_parser_params params = {
  79                         .override = 0,
  80                         .initialize = 0,
  81                         .check_required = 0,
  82                         .check_ambiguity = 0
  83                 };
  84                 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
  85                         fprintf(stderr, "parse error in config file\n");
  86                         exit(EXIT_FAILURE);
  87                 }
  88         }
  89         args = conf.inputs_num?
  90                 concat_args(conf.inputs_num, conf.inputs) :
  91                 para_strdup("stat");
  92         bufsize = conf.bufsize_arg;
  93         buf = para_malloc(bufsize);
  94         if (conf.socket_given)
  95                 socket_name = para_strdup(conf.socket_arg);
  96         else
  97                 socket_name = make_message(
  98                         "/var/paraslash/audiod_socket.%s", hn);
  99         if (conf.tmpdir_given)
 100                 tmpsocket_name = make_message("%s/audioc.sock.%s.%s",
 101                         conf.tmpdir_arg, hn, randname);
 102         else
 103                 tmpsocket_name = make_message("%s/.paraslash/audioc_sock.%s.%s",
 104                         home, hn, randname);
 105
 106         ret = create_local_socket(tmpsocket_name, &unix_addr, S_IRUSR | S_IWUSR);
 107         unlink(tmpsocket_name);
 108         free(tmpsocket_name);
 109         if (ret < 0)
 110                 goto out;
 111         fd = ret;
 112         ret = -E_INIT_SOCK_ADDR;
 113         if (init_unix_addr(&unix_addr, socket_name) < 0)
 114                 goto out;
 115         ret = PARA_CONNECT(fd, &unix_addr);
 116         if (ret < 0)
 117                 goto out;
 118         ret = send_cred_buffer(fd, args);
 119         if (ret < 0)
 120                 goto out;
 121         for (;;) {
 122                 int max_fileno = -1, check_write = 0;
 123                 ssize_t len;
 124                 fd_set rfd, wfd;
 125                 FD_ZERO(&rfd);
 126                 FD_ZERO(&wfd);
 127                 if (loaded < bufsize)
 128                         para_fd_set(fd, &rfd, &max_fileno);
 129                 if (loaded > 0) {
 130                         para_fd_set(STDOUT_FILENO, &wfd, &max_fileno);
 131                         check_write = 1;
 132                 }
 133                 ret = -E_AUDIOC_OVERRUN;
 134                 if (max_fileno < 0)
 135                         goto out;
 136                 ret = para_select(max_fileno + 1, &rfd, &wfd, NULL);
 137                 if (ret < 0)
 138                         goto out;
 139                 if (loaded < bufsize && FD_ISSET(fd, &rfd)) {
 140                         len = recv_bin_buffer(fd, buf + loaded,
 141                                 bufsize - loaded);
 142                         if (len <= 0) {
 143                                 ret = len < 0? -E_AUDIOC_READ : 0;
 144                                 goto out;
 145                         }
 146                         loaded += len;
 147                 }
 148                 if (check_write && FD_ISSET(STDOUT_FILENO, &wfd)) {
 149                         ret = write(STDOUT_FILENO, buf, loaded);
 150                         if (ret < 0) {
 151                                 ret = -E_AUDIOC_WRITE;
 152                                 goto out;
 153                         }
 154                         loaded -= ret;
 155                 }
 156         }
 157 out:
 158         if (!ret && loaded && buf)
 159                 ret = write(STDOUT_FILENO, buf, loaded);
 160         if (ret < 0)
 161                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 162         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 163 }