server.h

   1 /*
   2  * Copyright (C) 1997-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file server.h Common server data structures. */
   8
   9
  10 /** Size of the selector_info and audio_file info strings of struct misc_meta_data. */
  11 #define MMD_INFO_SIZE 16384
  12
  13 /**
  14  * Defines one command of para_server.
  15  */
  16 struct server_command {
  17         /** The name of the command. */
  18         const char *name;
  19         /** Pointer to the function that handles the command. */
  20         int (*handler)(int, int, char * const * const);
  21         /** The privileges a user must have to execute this command. */
  22         unsigned int perms;
  23         /** One-line description of the command. */
  24         const char *description;
  25         /** Summary of the command line options. */
  26         const char *usage;
  27         /** The long help text. */
  28         const char *help;
  29 };
  30
  31 /** Holds the arguments for the para_server's sender command. */
  32 struct sender_command_data{
  33         /** Greater than 0 indicates that a sender cmd is already queued. */
  34         int cmd_num;
  35         /** The number of the sender in question. */
  36         int sender_num;
  37         /** Used for the allow/deny/add/remove subcommands. */
  38         struct in_addr addr;
  39         /** Used for allow/deny. */
  40         int netmask;
  41         /** The port number for add/remove. */
  42         int port;
  43 };
  44
  45 /**
  46  * Used for parent-child communication.
  47  *
  48  * There's only one struct of this type which lives in shared memory
  49  * for communication between the server instances. Access to this
  50  * area is serialized via mmd_lock() and mmd_unlock(). There are two
  51  * reasons for a variable to be included here:
  52  *
  53  *      - At least one command (i.e. child of the server) must be able to
  54  *      change its value.
  55  *
  56  * or
  57  *
  58  *      - The contents are listed in the stat command and have to be up to
  59  *      date.
  60  */
  61 struct misc_meta_data {
  62         /** The size of the current audio file in bytes. */
  63         size_t size;
  64         /** The last modification time of the current audio file. */
  65         time_t mtime;
  66         /** The "old" status flags -- commands may only read them. */
  67         unsigned int vss_status_flags;
  68         /** The new status flags -- commands may set them. */
  69         unsigned int new_vss_status_flags;
  70         /** The number of data chunks sent for the current audio file. */
  71         long unsigned chunks_sent;
  72         /** Set by the jmp/ff commands to the new position in chunks. */
  73         long unsigned repos_request;
  74         /** The number of the chunk currently sent out. */
  75         long unsigned current_chunk;
  76         /** The milliseconds that have been skipped of the current audio file. */
  77         long offset;
  78         /** The time para_server started to stream. */
  79         struct timeval stream_start;
  80         /**
  81          * The event counter.
  82          *
  83          * Commands may increase this to force a status update to be sent to all
  84          * connected clients.
  85          */
  86         unsigned int events;
  87         /** The number of audio files already sent. */
  88         unsigned int num_played;
  89         /** The number of executed commands. */
  90         unsigned int num_commands;
  91         /** The number of connections para_server received so far. */
  92         unsigned int num_connects;
  93         /** The number of connections currently active. */
  94         unsigned int active_connections;
  95         /** The process id of the audio file selector. */
  96         pid_t afs_pid;
  97         /** This gets updated by afs and contains its current mode. */
  98         char afs_mode_string[MAXLINE];
  99         /** Used by the sender command. */
 100         struct sender_command_data sender_cmd_data;
 101         /** Describes the current audio file. */
 102         struct audio_file_data afd;
 103 };
 104
 105 /** Command line options for para_server. */
 106 extern struct server_args_info conf;
 107
 108 __noreturn void handle_connect(int fd, const char *peername);