Mercurial > dovecot > core-2.2
annotate src/lib-master/master-login-auth.c @ 12137:16330c0c8ef4
lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
This avoids unnecessary "Master requested auth for nonexistent client" errors
when auth process restarts (crashes).
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 20 Sep 2010 17:50:29 +0100 |
parents | e08dd68309a9 |
children | acd30d4601f9 |
rev | line source |
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Updated copyright notices to include year 2010.
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1 /* Copyright (c) 2009-2010 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 "network.h" |
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5 #include "ioloop.h" |
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6 #include "istream.h" |
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7 #include "ostream.h" |
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8 #include "llist.h" |
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9 #include "hex-binary.h" |
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10 #include "hash.h" |
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11 #include "str.h" |
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12 #include "master-interface.h" |
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13 #include "master-auth.h" |
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14 #include "master-login-auth.h" |
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15 |
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16 #include <stdlib.h> |
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17 |
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18 #define AUTH_MAX_INBUF_SIZE 8192 |
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19 |
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20 struct master_login_auth_request { |
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21 struct master_login_auth_request *prev, *next; |
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22 |
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23 unsigned int id; |
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24 time_t create_stamp; |
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25 |
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26 pid_t auth_pid; |
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27 unsigned int auth_id; |
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28 unsigned int client_pid; |
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29 uint8_t cookie[MASTER_AUTH_COOKIE_SIZE]; |
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30 |
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31 master_login_auth_request_callback_t *callback; |
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32 void *context; |
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33 }; |
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34 |
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35 struct master_login_auth { |
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36 pool_t pool; |
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37 const char *auth_socket_path; |
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38 int refcount; |
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39 |
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40 int fd; |
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41 struct io *io; |
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42 struct istream *input; |
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43 struct ostream *output; |
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44 struct timeout *to; |
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45 |
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46 unsigned int id_counter; |
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47 struct hash_table *requests; |
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48 /* linked list of requests, ordered by create_stamp */ |
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49 struct master_login_auth_request *request_head, *request_tail; |
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50 |
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51 pid_t auth_server_pid; |
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52 |
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53 unsigned int version_received:1; |
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54 unsigned int spid_received:1; |
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55 }; |
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56 |
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57 static void master_login_auth_set_timeout(struct master_login_auth *auth); |
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58 static void master_login_auth_send_all_requests(struct master_login_auth *auth); |
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59 |
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60 struct master_login_auth *master_login_auth_init(const char *auth_socket_path) |
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61 { |
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62 struct master_login_auth *auth; |
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63 pool_t pool; |
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64 |
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65 pool = pool_alloconly_create("master login auth", 1024); |
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66 auth = p_new(pool, struct master_login_auth, 1); |
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67 auth->pool = pool; |
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68 auth->auth_socket_path = p_strdup(pool, auth_socket_path); |
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69 auth->refcount = 1; |
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70 auth->fd = -1; |
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71 auth->requests = hash_table_create(default_pool, pool, 0, NULL, NULL); |
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72 return auth; |
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73 } |
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74 |
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75 void master_login_auth_disconnect(struct master_login_auth *auth) |
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76 { |
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77 struct master_login_auth_request *request; |
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78 |
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79 while (auth->request_head != NULL) { |
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80 request = auth->request_head; |
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81 DLLIST2_REMOVE(&auth->request_head, |
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82 &auth->request_tail, request); |
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83 |
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84 request->callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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85 request->context); |
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86 i_free(request); |
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87 } |
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88 hash_table_clear(auth->requests, FALSE); |
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89 |
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90 if (auth->to != NULL) |
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91 timeout_remove(&auth->to); |
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92 if (auth->io != NULL) |
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93 io_remove(&auth->io); |
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94 if (auth->fd != -1) { |
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95 i_stream_destroy(&auth->input); |
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96 o_stream_destroy(&auth->output); |
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97 |
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98 net_disconnect(auth->fd); |
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99 auth->fd = -1; |
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100 } |
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101 auth->version_received = FALSE; |
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102 } |
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103 |
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104 static void master_login_auth_unref(struct master_login_auth **_auth) |
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105 { |
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106 struct master_login_auth *auth = *_auth; |
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107 |
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108 *_auth = NULL; |
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109 |
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110 i_assert(auth->refcount > 0); |
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111 if (--auth->refcount > 0) |
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112 return; |
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113 |
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114 hash_table_destroy(&auth->requests); |
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115 pool_unref(&auth->pool); |
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116 } |
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117 |
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118 void master_login_auth_deinit(struct master_login_auth **_auth) |
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119 { |
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120 struct master_login_auth *auth = *_auth; |
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121 |
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122 *_auth = NULL; |
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123 |
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124 master_login_auth_disconnect(auth); |
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125 master_login_auth_unref(&auth); |
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126 } |
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127 |
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128 static unsigned int auth_get_next_timeout_secs(struct master_login_auth *auth) |
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129 { |
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130 time_t expires; |
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131 |
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132 expires = auth->request_head->create_stamp + |
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133 MASTER_AUTH_LOOKUP_TIMEOUT_SECS; |
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134 return expires <= ioloop_time ? 0 : expires - ioloop_time; |
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135 } |
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136 |
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137 static void master_login_auth_timeout(struct master_login_auth *auth) |
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138 { |
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139 struct master_login_auth_request *request; |
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140 |
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141 while (auth->request_head != NULL && |
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142 auth_get_next_timeout_secs(auth) == 0) { |
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143 request = auth->request_head; |
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144 DLLIST2_REMOVE(&auth->request_head, |
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145 &auth->request_tail, request); |
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146 hash_table_remove(auth->requests, POINTER_CAST(request->id)); |
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147 |
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148 i_error("Auth server request timed out after %u secs", |
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149 (unsigned int)(ioloop_time - request->create_stamp)); |
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150 request->callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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151 request->context); |
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152 i_free(request); |
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153 } |
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154 timeout_remove(&auth->to); |
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155 master_login_auth_set_timeout(auth); |
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156 } |
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157 |
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158 static void master_login_auth_set_timeout(struct master_login_auth *auth) |
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159 { |
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160 i_assert(auth->to == NULL); |
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161 |
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162 if (auth->request_head != NULL) { |
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163 auth->to = timeout_add(auth_get_next_timeout_secs(auth) * 1000, |
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164 master_login_auth_timeout, auth); |
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165 } |
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166 } |
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167 |
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168 static void |
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169 master_login_auth_request_remove(struct master_login_auth *auth, |
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170 struct master_login_auth_request *request) |
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171 { |
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172 bool update_timeout; |
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173 |
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174 update_timeout = request->prev == NULL; |
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175 |
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176 hash_table_remove(auth->requests, POINTER_CAST(request->id)); |
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177 DLLIST2_REMOVE(&auth->request_head, &auth->request_tail, request); |
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178 |
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179 if (update_timeout) { |
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180 timeout_remove(&auth->to); |
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181 master_login_auth_set_timeout(auth); |
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182 } |
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183 } |
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184 |
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185 static struct master_login_auth_request * |
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186 master_login_auth_lookup_request(struct master_login_auth *auth, |
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187 unsigned int id) |
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188 { |
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189 struct master_login_auth_request *request; |
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190 |
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191 request = hash_table_lookup(auth->requests, POINTER_CAST(id)); |
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192 if (request == NULL) { |
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193 i_error("Auth server sent reply with unknown ID %u", id); |
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194 return NULL; |
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195 } |
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196 master_login_auth_request_remove(auth, request); |
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197 return request; |
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198 } |
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199 |
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200 static bool |
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201 master_login_auth_input_user(struct master_login_auth *auth, const char *args) |
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202 { |
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203 struct master_login_auth_request *request; |
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204 const char *const *list; |
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205 unsigned int id; |
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206 |
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207 /* <id> <userid> [..] */ |
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208 |
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209 list = t_strsplit(args, "\t"); |
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210 if (list[0] == NULL || list[1] == NULL || |
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211 str_to_uint(list[0], &id) < 0) { |
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212 i_error("Auth server sent corrupted USER line"); |
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213 return FALSE; |
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214 } |
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215 |
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216 request = master_login_auth_lookup_request(auth, id); |
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217 if (request != NULL) { |
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218 request->callback(list + 1, NULL, request->context); |
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219 i_free(request); |
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220 } |
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221 return TRUE; |
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222 } |
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223 |
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224 static bool |
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225 master_login_auth_input_notfound(struct master_login_auth *auth, |
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226 const char *args) |
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227 { |
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228 struct master_login_auth_request *request; |
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229 unsigned int id; |
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230 |
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231 if (str_to_uint(args, &id) < 0) { |
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232 i_error("Auth server sent corrupted NOTFOUND line"); |
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233 return FALSE; |
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234 } |
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235 |
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236 request = master_login_auth_lookup_request(auth, id); |
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237 if (request != NULL) { |
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238 i_error("Authenticated user not found from userdb"); |
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239 request->callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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240 request->context); |
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241 i_free(request); |
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242 } |
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243 return TRUE; |
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244 } |
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245 |
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246 static bool |
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247 master_login_auth_input_fail(struct master_login_auth *auth, |
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248 const char *args_line) |
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249 { |
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250 struct master_login_auth_request *request; |
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251 const char *const *args, *error = NULL; |
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252 unsigned int i, id; |
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253 |
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254 args = t_strsplit(args_line, "\t"); |
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255 if (args[0] == NULL || str_to_uint(args[0], &id) < 0) { |
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256 i_error("Auth server sent broken FAIL line"); |
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257 return FALSE; |
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258 } |
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259 for (i = 1; args[i] != NULL; i++) { |
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260 if (strncmp(args[i], "reason=", 7) == 0) |
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261 error = args[i] + 7; |
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262 } |
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263 |
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264 request = master_login_auth_lookup_request(auth, id); |
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265 if (request != NULL) { |
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266 if (error != NULL) |
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267 i_error("Internal auth failure"); |
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268 request->callback(NULL, error != NULL ? error : |
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269 MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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270 request->context); |
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271 i_free(request); |
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272 } |
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273 return TRUE; |
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274 } |
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275 |
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276 static void master_login_auth_input(struct master_login_auth *auth) |
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277 { |
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278 const char *line; |
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279 bool ret; |
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280 |
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281 switch (i_stream_read(auth->input)) { |
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282 case 0: |
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283 return; |
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284 case -1: |
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285 /* disconnected */ |
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286 master_login_auth_disconnect(auth); |
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287 return; |
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288 case -2: |
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289 /* buffer full */ |
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290 i_error("Auth server sent us too long line"); |
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291 master_login_auth_disconnect(auth); |
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292 return; |
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293 } |
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294 |
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295 if (!auth->version_received) { |
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296 line = i_stream_next_line(auth->input); |
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297 if (line == NULL) |
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298 return; |
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299 |
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300 /* make sure the major version matches */ |
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301 if (strncmp(line, "VERSION\t", 8) != 0 || |
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302 !str_uint_equals(t_strcut(line + 8, '\t'), |
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303 AUTH_MASTER_PROTOCOL_MAJOR_VERSION)) { |
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304 i_error("Authentication server not compatible with " |
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305 "master process (mixed old and new binaries?)"); |
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306 master_login_auth_disconnect(auth); |
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307 return; |
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308 } |
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309 auth->version_received = TRUE; |
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310 } |
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311 if (!auth->spid_received) { |
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312 line = i_stream_next_line(auth->input); |
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313 if (line == NULL) |
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314 return; |
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315 |
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316 if (strncmp(line, "SPID\t", 5) != 0 || |
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317 str_to_pid(line + 5, &auth->auth_server_pid) < 0) { |
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318 i_error("Authentication server didn't " |
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319 "send valid SPID as expected: %s", line); |
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320 master_login_auth_disconnect(auth); |
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321 return; |
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322 } |
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323 auth->spid_received = TRUE; |
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324 master_login_auth_send_all_requests(auth); |
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325 } |
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326 |
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327 auth->refcount++; |
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328 while ((line = i_stream_next_line(auth->input)) != NULL) { |
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329 if (strncmp(line, "USER\t", 5) == 0) |
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330 ret = master_login_auth_input_user(auth, line + 5); |
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331 else if (strncmp(line, "NOTFOUND\t", 9) == 0) |
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332 ret = master_login_auth_input_notfound(auth, line + 9); |
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333 else if (strncmp(line, "FAIL\t", 5) == 0) |
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334 ret = master_login_auth_input_fail(auth, line + 5); |
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335 else |
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336 ret = TRUE; |
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337 |
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338 if (!ret || auth->input == NULL) { |
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339 master_login_auth_disconnect(auth); |
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340 break; |
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341 } |
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342 } |
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343 master_login_auth_unref(&auth); |
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344 } |
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345 |
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346 static int |
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347 master_login_auth_connect(struct master_login_auth *auth) |
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348 { |
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349 int fd; |
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350 |
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351 i_assert(auth->fd == -1); |
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352 |
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353 fd = net_connect_unix_with_retries(auth->auth_socket_path, 1000); |
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354 if (fd == -1) { |
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355 i_error("net_connect_unix(%s) failed: %m", |
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356 auth->auth_socket_path); |
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357 return -1; |
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358 } |
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359 auth->fd = fd; |
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360 auth->input = i_stream_create_fd(fd, AUTH_MAX_INBUF_SIZE, FALSE); |
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361 auth->output = o_stream_create_fd(fd, (size_t)-1, FALSE); |
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362 auth->io = io_add(fd, IO_READ, master_login_auth_input, auth); |
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363 return 0; |
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364 } |
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365 |
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366 static void |
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367 master_login_auth_send_request(struct master_login_auth *auth, |
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368 struct master_login_auth_request *req) |
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369 { |
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370 string_t *str; |
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371 |
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372 i_assert(auth->spid_received); |
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373 |
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374 if (auth->auth_server_pid != req->auth_pid) { |
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375 /* auth server was restarted. don't even attempt a login. */ |
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376 master_login_auth_request_remove(auth, req); |
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377 req->callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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378 req->context); |
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379 i_free(req); |
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380 return; |
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381 } |
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382 |
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383 str = t_str_new(128); |
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384 str_printfa(str, "REQUEST\t%u\t%u\t%u\t", req->id, |
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385 req->client_pid, req->auth_id); |
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386 binary_to_hex_append(str, req->cookie, sizeof(req->cookie)); |
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387 str_append_c(str, '\n'); |
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388 o_stream_send(auth->output, str_data(str), str_len(str)); |
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389 } |
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390 |
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391 static void master_login_auth_send_all_requests(struct master_login_auth *auth) |
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392 { |
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393 struct master_login_auth_request *req, *next; |
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394 |
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395 for (req = auth->request_head; req != NULL; req = next) { |
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396 next = req->next; |
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397 master_login_auth_send_request(auth, req); |
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398 } |
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399 } |
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400 |
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401 void master_login_auth_request(struct master_login_auth *auth, |
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402 const struct master_auth_request *req, |
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403 master_login_auth_request_callback_t *callback, |
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404 void *context) |
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405 { |
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406 struct master_login_auth_request *login_req; |
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407 unsigned int id; |
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408 |
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409 if (auth->fd == -1) { |
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410 if (master_login_auth_connect(auth) < 0) { |
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411 callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE, |
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412 context); |
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413 return; |
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414 } |
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415 o_stream_send_str(auth->output, |
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416 t_strdup_printf("VERSION\t%u\t%u\n", |
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417 AUTH_MASTER_PROTOCOL_MAJOR_VERSION, |
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418 AUTH_MASTER_PROTOCOL_MINOR_VERSION)); |
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419 } |
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420 |
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421 id = ++auth->id_counter; |
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422 if (id == 0) |
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423 id++; |
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424 |
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425 login_req = i_new(struct master_login_auth_request, 1); |
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426 login_req->create_stamp = ioloop_time; |
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427 login_req->id = id; |
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428 login_req->auth_pid = req->auth_pid; |
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429 login_req->client_pid = req->client_pid; |
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430 login_req->auth_id = req->auth_id; |
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431 memcpy(login_req->cookie, req->cookie, sizeof(login_req->cookie)); |
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432 login_req->callback = callback; |
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433 login_req->context = context; |
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434 hash_table_insert(auth->requests, POINTER_CAST(id), login_req); |
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435 DLLIST2_APPEND(&auth->request_head, &auth->request_tail, login_req); |
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436 |
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437 if (auth->to == NULL) |
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438 master_login_auth_set_timeout(auth); |
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439 |
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440 if (auth->spid_received) |
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441 master_login_auth_send_request(auth, login_req); |
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442 } |
10199
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443 |
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444 unsigned int master_login_auth_request_count(struct master_login_auth *auth) |
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445 { |
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446 return hash_table_count(auth->requests); |
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447 } |