server.h

   1 /*
   2  * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file server.h common server data structures */
  20
  21 #include "para.h"
  22 #include "list.h"
  23 #include <openssl/pem.h>
  24
  25 /** size of the selector_info and audio_file info strings of struct misc_meta_data */
  26 #define MMD_INFO_SIZE 16384
  27
  28 /**
  29  * permission flags that can be set individually for any server command
  30  *
  31  * - DB_READ: command reads from the database
  32  * - DB_WRITE: command changes the contents of the database
  33  * - AFS_READ: command reads information about the current audio stream
  34  * - AFS_WRITE: command changes the current audio stream
  35  */
  36 enum {DB_READ = 1, DB_WRITE = 2, AFS_READ = 4, AFS_WRITE = 8};
  37
  38 /**
  39  * data needed to authenticate the user
  40  */
  41 struct user {
  42         /** the position of this user in the list of users */
  43         struct list_head node;
  44         /** the username */
  45         char *name;
  46         /**  the public RSA key */
  47         RSA *rsa;
  48         /** the privileges that this user has */
  49         unsigned int perms;
  50 };
  51
  52 /**
  53  * defines one command of para_server
  54  */
  55 struct server_command {
  56 /** the name of the command */
  57         const char *name;
  58 /** pointer to the function that handles the command */
  59         int (*handler)(int, int, char **);
  60 /** the privileges a user must have to execute this command */
  61         unsigned int perms;
  62 /** one-line description of the command */
  63         const char *description;
  64 /** summary of the command line options */
  65         const char *synopsis;
  66 /** the long help text */
  67         const char *help;
  68 };
  69
  70 /** holds the arguments for the para_server's sender command */
  71 struct sender_command_data{
  72 /** greater than 0 indicates that a sender cmd is already queued */
  73         int cmd_num;
  74 /** the number of the sender in question */
  75         int sender_num;
  76 /** used for the allow/deny/add/remove subcommands */
  77         struct in_addr addr;
  78 /** used for allow/deny */
  79         int netmask;
  80 /** the portnumber for add/remove */
  81         int port;
  82 };
  83
  84 /**
  85  * used for parent-child communication
  86  *
  87  * There's only one struct of this type which lives in shared memory
  88  * for communication between the server instances. Access to this
  89  * area is serialized via mmd_lock() and mmd_unlock(). There are two
  90  * reasons for a variable to be included here:
  91  *
  92  *      - At least one command (i.e. child of the server) must be able to
  93  *      change its value.
  94  *
  95  * or
  96  *
  97  *      - The contents are listed in the stat command and have to be up to
  98  *      date.
  99  */
 100 struct misc_meta_data{
 101 /** the size of the current audio file in bytes */
 102         long unsigned int size;
 103 /** the full path of the current audio file */
 104         char filename[_POSIX_PATH_MAX];
 105 /** the last modification file of the current audio file */
 106         time_t mtime;
 107 /* the number of the current audio format */
 108         int audio_format;
 109 /** the "old" status flags -- commands may only read them */
 110         unsigned int afs_status_flags;
 111 /** the new status flags -- commands may set them **/
 112         unsigned int new_afs_status_flags;
 113 /** the number of data chunks sent for the current audio file */
 114         long unsigned chunks_sent;
 115 /** the number of chunks this audio file contains */
 116         long unsigned chunks_total;
 117 /** set by the jmp/ff commands to the new position in chunks */
 118         long unsigned repos_request;
 119 /** the number of the chunk currently sent out*/
 120         long unsigned current_chunk;
 121 /** the milliseconds that have been skipped of the current audio file */
 122         long offset;
 123 /** the length of the audio file in seconds */
 124         int seconds_total;
 125 /** the time para_server started to stream */
 126         struct timeval stream_start;
 127 /** a string that gets filled in by the audio format handler */
 128         char audio_file_info[MMD_INFO_SIZE];
 129 /** the event counter
 130  *
 131  * commands may increase this to force a status update to be sent to all
 132  * connected clients
 133 */
 134         unsigned int events;
 135 /** the number of audio files already sent */
 136         unsigned int num_played;
 137 /** the number of executed commands */
 138         unsigned int num_commands;
 139 /** the number of connections para_server received so far */
 140         unsigned int num_connects;
 141 /** the number of connections currently active */
 142         unsigned int active_connections;
 143 /** the process id of para_server */
 144         pid_t server_pid;
 145 /** a string that gets filled in by the current audio file selector */
 146         char selector_info[MMD_INFO_SIZE];
 147 /** the number if the current audio file selector */
 148         int selector_num;
 149 /** commands set this to non-zero to change the current selector */
 150         int selector_change;
 151 /** used by the sender command */
 152         struct sender_command_data sender_cmd_data;
 153 };
 154
 155 extern struct server_args_info conf;
 156
 157 int handle_connect(int fd, struct sockaddr_in *addr);
 158 int get_user(struct user *user);
 159 void mmd_unlock(void);
 160 void mmd_lock(void);