server.h

   1 /*
   2  * Copyright (C) 1997-2007 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 #include "para.h"
  10 #include "afh.h"
  11
  12 /** size of the selector_info and audio_file info strings of struct misc_meta_data */
  13 #define MMD_INFO_SIZE 16384
  14
  15 /**
  16  * defines one command of para_server
  17  */
  18 struct server_command {
  19 /** the name of the command */
  20         const char *name;
  21 /** pointer to the function that handles the command */
  22         int (*handler)(int, int, char **);
  23 /** the privileges a user must have to execute this command */
  24         unsigned int perms;
  25 /** one-line description of the command */
  26         const char *description;
  27 /** summary of the command line options */
  28         const char *usage;
  29 /** the long help text */
  30         const char *help;
  31 };
  32
  33 /** holds the arguments for the para_server's sender command */
  34 struct sender_command_data{
  35 /** greater than 0 indicates that a sender cmd is already queued */
  36         int cmd_num;
  37 /** the number of the sender in question */
  38         int sender_num;
  39 /** used for the allow/deny/add/remove subcommands */
  40         struct in_addr addr;
  41 /** used for allow/deny */
  42         int netmask;
  43 /** the portnumber for add/remove */
  44         int port;
  45 };
  46
  47 /**
  48  * used for parent-child communication
  49  *
  50  * There's only one struct of this type which lives in shared memory
  51  * for communication between the server instances. Access to this
  52  * area is serialized via mmd_lock() and mmd_unlock(). There are two
  53  * reasons for a variable to be included here:
  54  *
  55  *      - At least one command (i.e. child of the server) must be able to
  56  *      change its value.
  57  *
  58  * or
  59  *
  60  *      - The contents are listed in the stat command and have to be up to
  61  *      date.
  62  */
  63 struct misc_meta_data {
  64 /** information on the current audio file  */
  65         struct audio_format_info afi;
  66 /** the size of the current audio file in bytes */
  67         size_t size;
  68 /** the full path of the current audio file */
  69         char filename[_POSIX_PATH_MAX];
  70 /** the last modification file of the current audio file */
  71         time_t mtime;
  72 /** the number of the current audio format */
  73         int audio_format;
  74 /** the "old" status flags -- commands may only read them */
  75         unsigned int vss_status_flags;
  76 /** the new status flags -- commands may set them **/
  77         unsigned int new_vss_status_flags;
  78 /** the number of data chunks sent for the current audio file */
  79         long unsigned chunks_sent;
  80 /** set by the jmp/ff commands to the new position in chunks */
  81         long unsigned repos_request;
  82 /** the number of the chunk currently sent out*/
  83         long unsigned current_chunk;
  84 /** the milliseconds that have been skipped of the current audio file */
  85         long offset;
  86 /** the time para_server started to stream */
  87         struct timeval stream_start;
  88 /** the event counter
  89  *
  90  * commands may increase this to force a status update to be sent to all
  91  * connected clients
  92 */
  93         unsigned int events;
  94 /** the number of audio files already sent */
  95         unsigned int num_played;
  96 /** the number of executed commands */
  97         unsigned int num_commands;
  98 /** the number of connections para_server received so far */
  99         unsigned int num_connects;
 100 /** the number of connections currently active */
 101         unsigned int active_connections;
 102 /** the process id of para_server */
 103         pid_t server_pid;
 104 /** a string that gets filled in by the current audio file selector */
 105         char selector_info[MMD_INFO_SIZE];
 106 /** the number if the current audio file selector */
 107         int selector_num;
 108 /** commands set this to non-zero to change the current selector */
 109         int selector_change;
 110 /** used by the sender command */
 111         struct sender_command_data sender_cmd_data;
 112 };
 113
 114 extern struct server_args_info conf;
 115
 116 int handle_connect(int fd, struct sockaddr_in *addr);
 117 void mmd_unlock(void);
 118 void mmd_lock(void);