Mercurial > dovecot > core-2.2

annotate src/director/user-directory.c @ 12782:447bce266022

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Updated copyright notices to include year 2011.
author Timo Sirainen <tss@iki.fi>
date Fri, 04 Mar 2011 20:54:29 +0200
parents e5730fb45680
children dab7043e8263
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12782
447bce266022 Updated copyright notices to include year 2011.
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diff changeset
1 /* Copyright (c) 2010-2011 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "ioloop.h"
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5 #include "array.h"
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6 #include "md5.h"
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7 #include "hash.h"
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8 #include "llist.h"
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9 #include "mail-host.h"
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10 #include "user-directory.h"
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11
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12 #define MAX_CLOCK_DRIFT_SECS 2
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13
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14 struct user_directory_iter {
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15 struct user_directory *dir;
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16 struct user *pos;
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17 };
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18
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19 struct user_directory {
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20 /* const char *username => struct user* */
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21 struct hash_table *hash;
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22 /* sorted by time */
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23 struct user *head, *tail;
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24
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25 ARRAY_DEFINE(iters, struct user_directory_iter *);
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26
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27 unsigned int timeout_secs;
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28 };
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29
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30 static void user_move_iters(struct user_directory *dir, struct user *user)
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31 {
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32 struct user_directory_iter *const *iterp;
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33
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34 array_foreach(&dir->iters, iterp) {
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35 if ((*iterp)->pos == user)
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36 (*iterp)->pos = user->next;
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37 }
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38 }
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39
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40 static void user_free(struct user_directory *dir, struct user *user)
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41 {
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42 i_assert(user->host->user_count > 0);
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43 user->host->user_count--;
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44
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45 user_move_iters(dir, user);
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46
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47 hash_table_remove(dir->hash, POINTER_CAST(user->username_hash));
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48 DLLIST2_REMOVE(&dir->head, &dir->tail, user);
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49 i_free(user);
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50 }
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51
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52 static void user_directory_drop_expired(struct user_directory *dir)
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53 {
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54 while (dir->head != NULL &&
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55 !user_directory_user_has_connections(dir, dir->head))
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56 user_free(dir, dir->head);
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57 }
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58
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59 struct user *user_directory_lookup(struct user_directory *dir,
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60 unsigned int username_hash)
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61 {
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62 user_directory_drop_expired(dir);
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63
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64 return hash_table_lookup(dir->hash, POINTER_CAST(username_hash));
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65 }
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66
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67 struct user *
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68 user_directory_add(struct user_directory *dir, unsigned int username_hash,
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69 struct mail_host *host, time_t timestamp)
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70 {
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71 struct user *user;
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72
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73 user = i_new(struct user, 1);
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74 user->username_hash = username_hash;
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75 user->host = host;
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76 user->host->user_count++;
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77 user->timestamp = timestamp;
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78 DLLIST2_APPEND(&dir->head, &dir->tail, user);
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79
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80 hash_table_insert(dir->hash, POINTER_CAST(user->username_hash), user);
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81 return user;
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82 }
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83
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84 void user_directory_refresh(struct user_directory *dir, struct user *user)
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85 {
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86 user_move_iters(dir, user);
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87
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88 user->timestamp = ioloop_time;
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89 DLLIST2_REMOVE(&dir->head, &dir->tail, user);
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90 DLLIST2_APPEND(&dir->head, &dir->tail, user);
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91 }
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92
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93 void user_directory_remove_host(struct user_directory *dir,
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94 struct mail_host *host)
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95 {
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96 struct user *user, *next;
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97
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98 for (user = dir->head; user != NULL; user = next) {
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99 next = user->next;
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100
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101 if (user->host == host)
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102 user_free(dir, user);
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103 }
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104 }
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105
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106 unsigned int user_directory_get_username_hash(const char *username)
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107 {
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108 unsigned char md5[MD5_RESULTLEN];
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109 unsigned int i, hash = 0;
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110
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111 md5_get_digest(username, strlen(username), md5);
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112 for (i = 0; i < sizeof(hash); i++)
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113 hash = (hash << CHAR_BIT) | md5[i];
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114 return hash;
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115 }
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116
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117 bool user_directory_user_has_connections(struct user_directory *dir,
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118 struct user *user)
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119 {
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120 time_t expire_timestamp = user->timestamp + dir->timeout_secs;
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121
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122 return expire_timestamp - MAX_CLOCK_DRIFT_SECS >= ioloop_time;
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123 }
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124
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125 struct user_directory *user_directory_init(unsigned int timeout_secs)
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126 {
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127 struct user_directory *dir;
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128
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129 dir = i_new(struct user_directory, 1);
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130 dir->timeout_secs = timeout_secs;
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131 dir->hash = hash_table_create(default_pool, default_pool,
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132 0, NULL, NULL);
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133 i_array_init(&dir->iters, 8);
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134 return dir;
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135 }
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136
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137 void user_directory_deinit(struct user_directory **_dir)
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138 {
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139 struct user_directory *dir = *_dir;
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140
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141 *_dir = NULL;
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142
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143 i_assert(array_count(&dir->iters) == 0);
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144
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145 while (dir->head != NULL)
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146 user_free(dir, dir->head);
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147 hash_table_destroy(&dir->hash);
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148 array_free(&dir->iters);
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149 i_free(dir);
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150 }
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151
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152 struct user_directory_iter *
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153 user_directory_iter_init(struct user_directory *dir)
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154 {
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155 struct user_directory_iter *iter;
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156
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157 iter = i_new(struct user_directory_iter, 1);
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158 iter->dir = dir;
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159 iter->pos = dir->head;
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160 array_append(&dir->iters, &iter, 1);
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161 return iter;
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162 }
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163
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164 struct user *user_directory_iter_next(struct user_directory_iter *iter)
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165 {
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166 struct user *user;
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167
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168 user = iter->pos;
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169 if (user == NULL)
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170 return FALSE;
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171
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172 iter->pos = user->next;
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173 return user;
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174 }
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175
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176 void user_directory_iter_deinit(struct user_directory_iter **_iter)
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177 {
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178 struct user_directory_iter *iter = *_iter;
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179 struct user_directory_iter *const *iters;
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180 unsigned int i, count;
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181
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182 *_iter = NULL;
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183
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184 iters = array_get(&iter->dir->iters, &count);
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185 for (i = 0; i < count; i++) {
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186 if (iters[i] == iter) {
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187 array_delete(&iter->dir->iters, i, 1);
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188 break;
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189 }
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190 }
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191 i_free(iter);
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192 }