audioc.c

   1 /*
   2  * Copyright (C) 2005-2011 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
  12 #include "audioc.cmdline.h"
  13 #include "para.h"
  14 #include "error.h"
  15 #include "net.h"
  16 #include "string.h"
  17 #include "fd.h"
  18 #include "version.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;
  31         char *buf = NULL;
  32
  33         for (i = 0; i < argc; i++) {
  34                 buf = para_strcat(buf, argv[i]);
  35                 if (i != argc - 1)
  36                         buf = para_strcat(buf, "\n");
  37         }
  38         return buf;
  39 }
  40
  41 static char *configfile_exists(void)
  42 {
  43         static char *config_file;
  44         struct stat statbuf;
  45
  46         if (!config_file) {
  47                 char *home = para_homedir();
  48                 config_file = make_message("%s/.paraslash/audioc.conf", home);
  49                 free(home);
  50         }
  51         if (!stat(config_file, &statbuf))
  52                 return config_file;
  53         return NULL;
  54 }
  55
  56 /**
  57  * The client program to connect to para_audiod.
  58  *
  59  * \param argc Usual argument count.
  60  * \param argv Usual argument vector.
  61  *
  62  * It creates a temporary local socket in order to communicate with para_audiod.
  63  * Authentication consists in sending a ucred buffer that contains the user id.
  64  *
  65  * Any output received through the local socket is sent to stdout.
  66  *
  67  * \return EXIT_SUCCESS or EXIT_FAILURE.
  68  *
  69  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
  70  */
  71 int main(int argc, char *argv[])
  72 {
  73         int ret = -E_AUDIOC_SYNTAX, fd;
  74         char *cf, *buf = NULL, *args;
  75         size_t bufsize;
  76
  77         if (audioc_cmdline_parser(argc, argv, &conf))
  78                 goto out;
  79         HANDLE_VERSION_FLAG("audioc", conf);
  80         cf = configfile_exists();
  81         if (cf) {
  82                 struct audioc_cmdline_parser_params params = {
  83                         .override = 0,
  84                         .initialize = 0,
  85                         .check_required = 0,
  86                         .check_ambiguity = 0
  87                 };
  88                 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
  89                         fprintf(stderr, "parse error in config file\n");
  90                         exit(EXIT_FAILURE);
  91                 }
  92         }
  93         loglevel = get_loglevel_by_name(conf.loglevel_arg);
  94         args = conf.inputs_num?
  95                 concat_args(conf.inputs_num, conf.inputs) :
  96                 para_strdup("stat");
  97
  98         if (conf.socket_given)
  99                 ret = connect_local_socket(conf.socket_arg);
 100         else {
 101                 char *hn = para_hostname(), *socket_name = make_message(
 102                         "/var/paraslash/audiod_socket.%s", hn);
 103                 ret = connect_local_socket(socket_name);
 104                 free(hn);
 105                 free(socket_name);
 106         }
 107         if (ret < 0) {
 108                 PARA_EMERG_LOG("failed to connect to local socket\n");
 109                 goto out;
 110         }
 111         fd = ret;
 112         ret = send_cred_buffer(fd, args);
 113         if (ret < 0)
 114                 goto out;
 115         bufsize = conf.bufsize_arg;
 116         buf = para_malloc(bufsize);
 117         do {
 118                 size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
 119                 if (ret <= 0)
 120                         break;
 121                 ret = write_all(STDOUT_FILENO, buf, &n);
 122         } while (ret >= 0);
 123 out:
 124         if (ret < 0)
 125                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 126         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 127 }