server.h

   1 /*
   2  * Copyright (C) 1997-2009 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 /** Size of the selector_info and audio_file info strings of struct misc_meta_data. */
  10 #define MMD_INFO_SIZE 16384
  11
  12 /** The maximum length of the host component in an URL */
  13 #define MAX_HOSTLEN     256
  14
  15
  16 /** Holds the arguments for the para_server's sender command. */
  17 struct sender_command_data{
  18         /** Greater than 0 indicates that a sender cmd is already queued. */
  19         int cmd_num;
  20         /** The number of the sender in question. */
  21         int sender_num;
  22         /** Used for the allow/deny/add/remove subcommands. */
  23         char host[MAX_HOSTLEN];
  24         /** Used for allow/deny. */
  25         int netmask;
  26         /** The port number for add/remove. */
  27         int port;
  28         /** Maximal slice size. */
  29         uint16_t max_slice_bytes;
  30         /** Number of data slices plus redundant slices. */
  31         uint8_t slices_per_group;
  32         /** Number of slices minus number of redundant slices. */
  33         uint8_t data_slices_per_group;
  34 };
  35
  36 /**
  37  * Used for parent-child communication.
  38  *
  39  * There's only one struct of this type which lives in shared memory
  40  * for communication between the server instances. Access to this
  41  * area is serialized via mmd_lock() and mmd_unlock(). There are two
  42  * reasons for a variable to be included here:
  43  *
  44  *      - At least one command (i.e. child of the server) must be able to
  45  *      change its value.
  46  *
  47  * or
  48  *
  49  *      - The contents are listed in the stat command and have to be up to
  50  *      date.
  51  */
  52 struct misc_meta_data {
  53         /** The size of the current audio file in bytes. */
  54         size_t size;
  55         /** The last modification time of the current audio file. */
  56         time_t mtime;
  57         /** The "old" status flags -- commands may only read them. */
  58         unsigned int vss_status_flags;
  59         /** The new status flags -- commands may set them. */
  60         unsigned int new_vss_status_flags;
  61         /** The number of data chunks sent for the current audio file. */
  62         long unsigned chunks_sent;
  63         /** Set by the jmp/ff commands to the new position in chunks. */
  64         long unsigned repos_request;
  65         /** The number of the chunk currently sent out. */
  66         long unsigned current_chunk;
  67         /** The milliseconds that have been skipped of the current audio file. */
  68         long offset;
  69         /** The time para_server started to stream. */
  70         struct timeval stream_start;
  71         /**
  72          * The event counter.
  73          *
  74          * Commands may increase this to force a status update to be sent to all
  75          * connected clients.
  76          */
  77         unsigned int events;
  78         /** The number of audio files already sent. */
  79         unsigned int num_played;
  80         /** The number of executed commands. */
  81         unsigned int num_commands;
  82         /** The number of connections para_server received so far. */
  83         unsigned int num_connects;
  84         /** The number of connections currently active. */
  85         unsigned int active_connections;
  86         /** The process id of the audio file selector. */
  87         pid_t afs_pid;
  88         /** This gets updated by afs and contains its current mode. */
  89         char afs_mode_string[MAXLINE];
  90         /** Used by the sender command. */
  91         struct sender_command_data sender_cmd_data;
  92         /** Describes the current audio file. */
  93         struct audio_file_data afd;
  94 };
  95
  96 /** Command line options for para_server. */
  97 extern struct server_args_info conf;
  98
  99 __noreturn void handle_connect(int fd, const char *peername);
 100 void parse_config_or_die(int override);