1 | <?php |
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2 | /*************************************************************************** |
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3 | * functions_session.inc.php * |
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4 | * ------------------- * |
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5 | * application : PhpWebGallery 1.3 * |
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6 | * author : Pierrick LE GALL <pierrick@z0rglub.com> * |
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7 | * * |
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8 | *************************************************************************** |
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9 | |
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10 | *************************************************************************** |
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11 | * * |
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12 | * This program is free software; you can redistribute it and/or modify * |
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13 | * it under the terms of the GNU General Public License as published by * |
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14 | * the Free Software Foundation; * |
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15 | * * |
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16 | ***************************************************************************/ |
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17 | function generate_key() |
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18 | { |
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19 | global $conf; |
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20 | $md5 = md5( substr( microtime(), 2, 6 ).$conf['session_keyword'] ); |
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21 | $init = ""; |
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22 | for ( $i = 0; $i < strlen( $md5 ); $i++ ) |
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23 | { |
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24 | if ( is_numeric( $md5[$i] ) ) |
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25 | { |
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26 | $init.= "$md5[$i]"; |
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27 | } |
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28 | } |
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29 | $init = substr( $init, 0, 8 ); |
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30 | mt_srand( $init ); |
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31 | $key = ""; |
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32 | for ( $i = 0; $i < $conf['session_id_size']; $i++ ) |
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33 | { |
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34 | $c = mt_rand( 0, 2 ); |
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35 | if ( $c == 0 ) |
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36 | { |
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37 | $key .= chr( mt_rand( 65, 90 ) ); |
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38 | } |
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39 | elseif ( $c == 1 ) |
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40 | { |
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41 | $key .= chr( mt_rand( 97, 122 ) ); |
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42 | } |
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43 | else |
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44 | { |
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45 | $key .= mt_rand( 0, 9 ); |
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46 | } |
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47 | } |
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48 | return $key; |
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49 | } |
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50 | |
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51 | function session_create( $username ) |
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52 | { |
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53 | global $conf,$prefixeTable,$REMOTE_ADDR; |
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54 | // 1. searching an unused sesison key |
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55 | $id_found = false; |
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56 | while ( !$id_found ) |
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57 | { |
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58 | $generated_id = generate_key(); |
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59 | $query = 'select id'; |
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60 | $query.= ' from '.$prefixeTable.'sessions'; |
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61 | $query.= " where id = '".$generated_id."';"; |
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62 | $result = mysql_query( $query ); |
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63 | if ( mysql_num_rows( $result ) == 0 ) |
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64 | { |
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65 | $id_found = true; |
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66 | } |
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67 | } |
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68 | // 2. retrieving id of the username given in parameter |
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69 | $query = 'select id'; |
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70 | $query.= ' from '.$prefixeTable.'users'; |
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71 | $query.= " where username = '".$username."';"; |
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72 | $row = mysql_fetch_array( mysql_query( $query ) ); |
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73 | $user_id = $row['id']; |
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74 | // 3. inserting session in database |
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75 | $expiration = $conf['session_time']*60+time(); |
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76 | $query = 'insert into '.$prefixeTable.'sessions'; |
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77 | $query.= ' (id,user_id,expiration,ip) values'; |
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78 | $query.= "('".$generated_id."','".$user_id; |
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79 | $query.= "','".$expiration."','".$REMOTE_ADDR."');"; |
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80 | mysql_query( $query ); |
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81 | |
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82 | return $generated_id; |
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83 | } |
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84 | |
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85 | // add_session_id adds the id of the session to the string given in |
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86 | // parameter as $url. If the session id is the first parameter to the url, |
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87 | // it is preceded by a '?', else it is preceded by a '&'. If the |
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88 | // parameter $redirect is set to true, '&' is used instead of '&'. |
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89 | function add_session_id( $url, $redirect = false ) |
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90 | { |
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91 | global $page, $user; |
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92 | $amp = '&'; |
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93 | if ( $redirect ) |
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94 | { |
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95 | $amp = '&'; |
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96 | } |
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97 | if ( !$user['is_the_guest'] ) |
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98 | { |
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99 | if ( preg_match( '/\.php\?/',$url ) ) |
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100 | { |
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101 | return $url.$amp.'id='.$page['session_id']; |
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102 | } |
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103 | else |
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104 | { |
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105 | return $url.'?id='.$page['session_id']; |
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106 | } |
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107 | } |
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108 | else |
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109 | { |
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110 | return $url; |
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111 | } |
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112 | } |
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113 | ?> |
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