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>
date Mon, 20 Sep 2010 17:50:29 +0100
parents e08dd68309a9
children acd30d4601f9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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);
10101
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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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diff changeset
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 }
10101
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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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260e190306b0 Started using str_to_*() functions instead of libc's ones.
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302 !str_uint_equals(t_strcut(line + 8, '\t'),
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303 AUTH_MASTER_PROTOCOL_MAJOR_VERSION)) {
10101
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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 }
12137
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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 }
10101
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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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diff changeset
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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diff changeset
340 break;
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341 }
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342 }
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diff changeset
343 master_login_auth_unref(&auth);
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344 }
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345
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diff changeset
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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diff changeset
349 int fd;
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diff changeset
350
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diff changeset
351 i_assert(auth->fd == -1);
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diff changeset
352
10159
e027503ddb6b Use net_connect_unix_with_retries() instead of duplicating the code everywhere.
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parents: 10101
diff changeset
353 fd = net_connect_unix_with_retries(auth->auth_socket_path, 1000);
10101
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diff changeset
354 if (fd == -1) {
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diff changeset
355 i_error("net_connect_unix(%s) failed: %m",
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diff changeset
356 auth->auth_socket_path);
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diff changeset
357 return -1;
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diff changeset
358 }
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diff changeset
359 auth->fd = fd;
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diff changeset
360 auth->input = i_stream_create_fd(fd, AUTH_MAX_INBUF_SIZE, FALSE);
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diff changeset
361 auth->output = o_stream_create_fd(fd, (size_t)-1, FALSE);
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diff changeset
362 auth->io = io_add(fd, IO_READ, master_login_auth_input, auth);
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diff changeset
363 return 0;
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parents:
diff changeset
364 }
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365
12137
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diff changeset
366 static void
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diff changeset
367 master_login_auth_send_request(struct master_login_auth *auth,
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
368 struct master_login_auth_request *req)
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
369 {
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
370 string_t *str;
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diff changeset
371
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
372 i_assert(auth->spid_received);
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diff changeset
373
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diff changeset
374 if (auth->auth_server_pid != req->auth_pid) {
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
375 /* auth server was restarted. don't even attempt a login. */
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diff changeset
376 master_login_auth_request_remove(auth, req);
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diff changeset
377 req->callback(NULL, MASTER_AUTH_ERRMSG_INTERNAL_FAILURE,
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
378 req->context);
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diff changeset
379 i_free(req);
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diff changeset
380 return;
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diff changeset
381 }
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
382
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
383 str = t_str_new(128);
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
384 str_printfa(str, "REQUEST\t%u\t%u\t%u\t", req->id,
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diff changeset
385 req->client_pid, req->auth_id);
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diff changeset
386 binary_to_hex_append(str, req->cookie, sizeof(req->cookie));
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
387 str_append_c(str, '\n');
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
388 o_stream_send(auth->output, str_data(str), str_len(str));
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
389 }
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diff changeset
390
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
391 static void master_login_auth_send_all_requests(struct master_login_auth *auth)
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
392 {
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diff changeset
393 struct master_login_auth_request *req, *next;
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diff changeset
394
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
395 for (req = auth->request_head; req != NULL; req = next) {
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
396 next = req->next;
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diff changeset
397 master_login_auth_send_request(auth, req);
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diff changeset
398 }
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diff changeset
399 }
16330c0c8ef4 lib-master: When finishing auth, don't send REQUEST if auth process has restarted.
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diff changeset
400
10101
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diff changeset
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 }
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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 }