audioc.c

   1 /*
   2  * Copyright (C) 2005-2008 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 <sys/types.h>
  10 #include <dirent.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
  19 INIT_AUDIOC_ERRLISTS;
  20
  21 /** the gengetopt structure containing command line args */
  22 struct audioc_args_info conf;
  23
  24 INIT_STDERR_LOGGING(conf.loglevel_arg);
  25
  26 static char *concat_args(unsigned argc, char * const *argv)
  27 {
  28         int i; char *buf = NULL;
  29         for (i = 0; i < argc; i++) {
  30                 buf = para_strcat(buf, argv[i]);
  31                 if (i != argc - 1)
  32                         buf = para_strcat(buf, "\n");
  33         }
  34         return buf;
  35 }
  36
  37 static char *configfile_exists(void)
  38 {
  39         static char *config_file;
  40         struct stat statbuf;
  41
  42
  43         if (!config_file) {
  44                 char *home = para_homedir();
  45                 config_file = make_message("%s/.paraslash/audioc.conf", home);
  46                 free(home);
  47         }
  48         if (!stat(config_file, &statbuf))
  49                 return config_file;
  50         return NULL;
  51 }
  52
  53 /**
  54  * the client program to connect to para_audiod
  55  *
  56  * \param argc usual argument count
  57  * \param argv usual argument vector
  58  *
  59  * It creates a temporary local socket in order to communicate with para_audiod.
  60  * Authentication consists in sending a ucred buffer that contains the user id.
  61  *
  62  * Any output received through the local socket is sent to stdout.
  63  *
  64  * \return EXIT_SUCCESS or EXIT_FAILURE
  65  *
  66  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
  67  */
  68 int main(int argc, char *argv[])
  69 {
  70         int ret = -E_AUDIOC_SYNTAX, fd;
  71         char *cf, *buf = NULL, *args;
  72         size_t bufsize, loaded = 0;
  73
  74         if (audioc_cmdline_parser(argc, argv, &conf))
  75                 goto out;
  76         HANDLE_VERSION_FLAG("audioc", conf);
  77         cf = configfile_exists();
  78         if (cf) {
  79                 struct audioc_cmdline_parser_params params = {
  80                         .override = 0,
  81                         .initialize = 0,
  82                         .check_required = 0,
  83                         .check_ambiguity = 0
  84                 };
  85                 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
  86                         fprintf(stderr, "parse error in config file\n");
  87                         exit(EXIT_FAILURE);
  88                 }
  89         }
  90         args = conf.inputs_num?
  91                 concat_args(conf.inputs_num, conf.inputs) :
  92                 para_strdup("stat");
  93         bufsize = conf.bufsize_arg;
  94         buf = para_malloc(bufsize);
  95
  96         if (conf.socket_given) {
  97                 ret = create_remote_socket(conf.socket_arg);
  98         } else {
  99                 char *hn = para_hostname(),
 100                      *socket_name = make_message("/var/paraslash/audiod_socket.%s", hn);
 101
 102                 ret = create_remote_socket(socket_name);
 103                 free(hn);
 104                 free(socket_name);
 105         }
 106         if (ret < 0)
 107                 goto out;
 108         fd = ret;
 109         ret = mark_fd_nonblocking(fd);
 110         if (ret < 0)
 111                 goto out;
 112         ret = mark_fd_nonblocking(STDOUT_FILENO);
 113         if (ret < 0)
 114                 goto out;
 115         ret = send_cred_buffer(fd, args);
 116         if (ret < 0)
 117                 goto out;
 118         for (;;) {
 119                 int max_fileno = -1, check_write = 0;
 120                 ssize_t len;
 121                 fd_set rfd, wfd;
 122                 FD_ZERO(&rfd);
 123                 FD_ZERO(&wfd);
 124                 if (loaded < bufsize)
 125                         para_fd_set(fd, &rfd, &max_fileno);
 126                 if (loaded > 0) {
 127                         para_fd_set(STDOUT_FILENO, &wfd, &max_fileno);
 128                         check_write = 1;
 129                 }
 130                 ret = -E_AUDIOC_OVERRUN;
 131                 if (max_fileno < 0)
 132                         goto out;
 133                 ret = para_select(max_fileno + 1, &rfd, &wfd, NULL);
 134                 if (ret < 0)
 135                         goto out;
 136                 if (loaded < bufsize && FD_ISSET(fd, &rfd)) {
 137                         len = recv_bin_buffer(fd, buf + loaded,
 138                                 bufsize - loaded);
 139                         if (len <= 0) {
 140                                 ret = len < 0? -E_AUDIOC_READ : 0;
 141                                 goto out;
 142                         }
 143                         loaded += len;
 144                 }
 145                 if (check_write && FD_ISSET(STDOUT_FILENO, &wfd)) {
 146                         ret = write(STDOUT_FILENO, buf, loaded);
 147                         if (ret < 0) {
 148                                 ret = -E_AUDIOC_WRITE;
 149                                 goto out;
 150                         }
 151                         loaded -= ret;
 152                 }
 153         }
 154 out:
 155         if (!ret && loaded && buf)
 156                 ret = write(STDOUT_FILENO, buf, loaded);
 157         if (ret < 0)
 158                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 159         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 160 }