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76
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_event_connect.h>
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11 #include <ngx_imap.h>
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12
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13
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14 typedef struct {
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15 ngx_flag_t enable;
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258
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16 ngx_flag_t pass_error_message;
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88
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17 size_t buffer_size;
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18 ngx_msec_t timeout;
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76
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19 } ngx_imap_proxy_conf_t;
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20
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21
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22 static void ngx_imap_proxy_block_read(ngx_event_t *rev);
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23 static void ngx_imap_proxy_imap_handler(ngx_event_t *rev);
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24 static void ngx_imap_proxy_pop3_handler(ngx_event_t *rev);
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25 static void ngx_imap_proxy_dummy_handler(ngx_event_t *ev);
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26 static ngx_int_t ngx_imap_proxy_read_response(ngx_imap_session_t *s,
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212
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27 ngx_uint_t state);
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76
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28 static void ngx_imap_proxy_handler(ngx_event_t *ev);
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258
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29 static void ngx_imap_proxy_upstream_error(ngx_imap_session_t *s);
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76
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30 static void ngx_imap_proxy_internal_server_error(ngx_imap_session_t *s);
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31 static void ngx_imap_proxy_close_session(ngx_imap_session_t *s);
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32 static void *ngx_imap_proxy_create_conf(ngx_conf_t *cf);
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33 static char *ngx_imap_proxy_merge_conf(ngx_conf_t *cf, void *parent,
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34 void *child);
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35
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36
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37 static ngx_command_t ngx_imap_proxy_commands[] = {
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88
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38
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76
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39 { ngx_string("proxy"),
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40 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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41 ngx_conf_set_flag_slot,
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42 NGX_IMAP_SRV_CONF_OFFSET,
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43 offsetof(ngx_imap_proxy_conf_t, enable),
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44 NULL },
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45
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88
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46 { ngx_string("proxy_buffer"),
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47 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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48 ngx_conf_set_size_slot,
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49 NGX_IMAP_SRV_CONF_OFFSET,
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50 offsetof(ngx_imap_proxy_conf_t, buffer_size),
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51 NULL },
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52
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53 { ngx_string("proxy_timeout"),
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54 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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55 ngx_conf_set_msec_slot,
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56 NGX_IMAP_SRV_CONF_OFFSET,
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57 offsetof(ngx_imap_proxy_conf_t, timeout),
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58 NULL },
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59
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258
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60 { ngx_string("proxy_pass_error_message"),
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61 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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62 ngx_conf_set_flag_slot,
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63 NGX_IMAP_SRV_CONF_OFFSET,
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64 offsetof(ngx_imap_proxy_conf_t, pass_error_message),
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65 NULL },
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66
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76
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67 ngx_null_command
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68 };
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69
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70
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71 static ngx_imap_module_t ngx_imap_proxy_module_ctx = {
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72 NULL, /* create main configuration */
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73 NULL, /* init main configuration */
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74
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75 ngx_imap_proxy_create_conf, /* create server configuration */
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76 ngx_imap_proxy_merge_conf /* merge server configuration */
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77 };
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78
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79
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80 ngx_module_t ngx_imap_proxy_module = {
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81 NGX_MODULE_V1,
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82 &ngx_imap_proxy_module_ctx, /* module context */
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83 ngx_imap_proxy_commands, /* module directives */
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84 NGX_IMAP_MODULE, /* module type */
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90
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85 NULL, /* init master */
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76
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86 NULL, /* init module */
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90
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87 NULL, /* init process */
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88 NULL, /* init thread */
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89 NULL, /* exit thread */
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90 NULL, /* exit process */
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91 NULL, /* exit master */
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92 NGX_MODULE_V1_PADDING
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76
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93 };
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94
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95
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96 void
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97 ngx_imap_proxy_init(ngx_imap_session_t *s, ngx_peers_t *peers)
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98 {
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136
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99 int keepalive;
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76
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100 ngx_int_t rc;
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101 ngx_imap_proxy_ctx_t *p;
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102 ngx_imap_core_srv_conf_t *cscf;
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103
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136
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104 s->connection->log->action = "connecting to upstream";
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105
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106 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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107
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108 if (cscf->so_keepalive) {
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109 keepalive = 1;
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110
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111 if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
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112 (const void *) &keepalive, sizeof(int))
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113 == -1)
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114 {
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115 ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
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116 "setsockopt(SO_KEEPALIVE) failed");
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117 }
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118 }
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119
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76
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120 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_imap_proxy_ctx_t));
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121 if (p == NULL) {
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122 ngx_imap_session_internal_server_error(s);
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123 return;
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124 }
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125
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126 s->proxy = p;
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127
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128 p->upstream.peers = peers;
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129 p->upstream.log = s->connection->log;
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130 p->upstream.log_error = NGX_ERROR_ERR;
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131
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132 rc = ngx_event_connect_peer(&p->upstream);
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133
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92
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134 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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135 ngx_imap_proxy_internal_server_error(s);
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76
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136 return;
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137 }
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138
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139 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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140
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141 p->upstream.connection->data = s;
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142 p->upstream.connection->pool = s->connection->pool;
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143
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144 s->connection->read->handler = ngx_imap_proxy_block_read;
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145 p->upstream.connection->write->handler = ngx_imap_proxy_dummy_handler;
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146
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147 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
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148 p->upstream.connection->read->handler = ngx_imap_proxy_pop3_handler;
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149 s->imap_state = ngx_pop3_start;
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150
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151 } else {
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152 p->upstream.connection->read->handler = ngx_imap_proxy_imap_handler;
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153 s->imap_state = ngx_imap_start;
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154 }
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155 }
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156
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157
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158 static void
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159 ngx_imap_proxy_block_read(ngx_event_t *rev)
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160 {
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161 ngx_connection_t *c;
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162 ngx_imap_session_t *s;
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163
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164 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy block read");
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165
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166 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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167 c = rev->data;
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168 s = c->data;
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169
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170 ngx_imap_proxy_close_session(s);
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171 }
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172 }
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173
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174
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175 static void
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176 ngx_imap_proxy_imap_handler(ngx_event_t *rev)
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177 {
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88
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178 u_char *p;
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179 ngx_int_t rc;
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180 ngx_str_t line;
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181 ngx_connection_t *c;
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182 ngx_imap_session_t *s;
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183 ngx_imap_proxy_conf_t *pcf;
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76
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184
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185 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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186 "imap proxy imap auth handler");
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187
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188 c = rev->data;
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189 s = c->data;
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190
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191 if (rev->timedout) {
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192 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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193 "upstream timed out");
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126
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194 c->timedout = 1;
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76
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195 ngx_imap_proxy_internal_server_error(s);
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196 return;
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197 }
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198
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199 if (s->proxy->buffer == NULL) {
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88
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200 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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76
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201
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88
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202 s->proxy->buffer = ngx_create_temp_buf(c->pool, pcf->buffer_size);
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76
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203 if (s->proxy->buffer == NULL) {
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204 ngx_imap_proxy_internal_server_error(s);
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205 return;
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206 }
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207 }
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208
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212
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209 rc = ngx_imap_proxy_read_response(s, s->imap_state);
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76
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210
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211 if (rc == NGX_AGAIN) {
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212 return;
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213 }
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214
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120
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215 if (rc == NGX_ERROR) {
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258
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216 ngx_imap_proxy_upstream_error(s);
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76
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217 return;
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218 }
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219
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220 switch (s->imap_state) {
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221
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222 case ngx_imap_start:
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223 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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224 "imap proxy send login");
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225
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136
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226 s->connection->log->action = "sending LOGIN command to upstream";
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227
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76
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228 line.len = s->tag.len + sizeof("LOGIN ") - 1
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229 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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230 line.data = ngx_palloc(c->pool, line.len);
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231 if (line.data == NULL) {
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232 ngx_imap_proxy_internal_server_error(s);
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233 return;
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234 }
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235
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236 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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237 &s->tag, s->login.len)
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238 - line.data;
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239
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240 s->imap_state = ngx_imap_login;
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241 break;
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242
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243 case ngx_imap_login:
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244 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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245
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136
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246 s->connection->log->action = "sending user name to upstream";
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247
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78
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248 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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76
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249 line.data = ngx_palloc(c->pool, line.len);
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250 if (line.data == NULL) {
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251 ngx_imap_proxy_internal_server_error(s);
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252 return;
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253 }
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254
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78
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255 line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
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76
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256 &s->login, s->passwd.len)
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257 - line.data;
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258
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259 s->imap_state = ngx_imap_user;
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260 break;
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261
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262 case ngx_imap_user:
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263 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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264 "imap proxy send passwd");
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265
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136
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266 s->connection->log->action = "sending password to upstream";
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267
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76
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268 line.len = s->passwd.len + 2;
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269 line.data = ngx_palloc(c->pool, line.len);
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270 if (line.data == NULL) {
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271 ngx_imap_proxy_internal_server_error(s);
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272 return;
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273 }
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274
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275 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
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276 *p++ = CR; *p = LF;
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277
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278 s->imap_state = ngx_imap_passwd;
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279 break;
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280
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212
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281 case ngx_imap_passwd:
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282 s->connection->read->handler = ngx_imap_proxy_handler;
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283 s->connection->write->handler = ngx_imap_proxy_handler;
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284 rev->handler = ngx_imap_proxy_handler;
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285 c->write->handler = ngx_imap_proxy_handler;
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286
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287 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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288 ngx_add_timer(s->connection->read, pcf->timeout);
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289 ngx_del_timer(c->read);
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290
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291 c->log->action = NULL;
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292 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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293
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294 ngx_imap_proxy_handler(s->connection->write);
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295
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296 return;
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297
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76
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298 default:
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299 #if (NGX_SUPPRESS_WARN)
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300 line.len = 0;
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301 line.data = NULL;
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302 #endif
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303 break;
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304 }
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305
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88
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306 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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76
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307 /*
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308 * we treat the incomplete sending as NGX_ERROR
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309 * because it is very strange here
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310 */
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311 ngx_imap_proxy_internal_server_error(s);
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312 return;
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313 }
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314
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315 s->proxy->buffer->pos = s->proxy->buffer->start;
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316 s->proxy->buffer->last = s->proxy->buffer->start;
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317 }
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318
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319
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320 static void
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321 ngx_imap_proxy_pop3_handler(ngx_event_t *rev)
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322 {
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88
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323 u_char *p;
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324 ngx_int_t rc;
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325 ngx_str_t line;
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326 ngx_connection_t *c;
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327 ngx_imap_session_t *s;
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328 ngx_imap_proxy_conf_t *pcf;
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76
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329
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330 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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331 "imap proxy pop3 auth handler");
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332
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333 c = rev->data;
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334 s = c->data;
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335
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336 if (rev->timedout) {
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337 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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338 "upstream timed out");
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126
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339 c->timedout = 1;
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76
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340 ngx_imap_proxy_internal_server_error(s);
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341 return;
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342 }
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343
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344 if (s->proxy->buffer == NULL) {
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88
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345 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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76
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346
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88
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347 s->proxy->buffer = ngx_create_temp_buf(c->pool, pcf->buffer_size);
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76
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348 if (s->proxy->buffer == NULL) {
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349 ngx_imap_proxy_internal_server_error(s);
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350 return;
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351 }
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352 }
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353
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212
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354 rc = ngx_imap_proxy_read_response(s, 0);
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76
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355
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356 if (rc == NGX_AGAIN) {
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357 return;
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358 }
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359
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120
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360 if (rc == NGX_ERROR) {
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258
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361 ngx_imap_proxy_upstream_error(s);
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76
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362 return;
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363 }
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364
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365 switch (s->imap_state) {
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366
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367 case ngx_pop3_start:
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368 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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369
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136
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370 s->connection->log->action = "sending user name to upstream";
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371
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76
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372 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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373 line.data = ngx_palloc(c->pool, line.len);
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374 if (line.data == NULL) {
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375 ngx_imap_proxy_internal_server_error(s);
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376 return;
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377 }
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378
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379 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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380 p = ngx_cpymem(p, s->login.data, s->login.len);
|
|
|
381 *p++ = CR; *p = LF;
|
|
|
382
|
|
|
383 s->imap_state = ngx_pop3_user;
|
|
|
384 break;
|
|
|
385
|
|
|
386 case ngx_pop3_user:
|
|
|
387 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send pass");
|
|
|
388
|
|
136
|
389 s->connection->log->action = "sending password to upstream";
|
|
|
390
|
|
76
|
391 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
|
|
|
392 line.data = ngx_palloc(c->pool, line.len);
|
|
|
393 if (line.data == NULL) {
|
|
|
394 ngx_imap_proxy_internal_server_error(s);
|
|
|
395 return;
|
|
|
396 }
|
|
|
397
|
|
|
398 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
|
|
|
399 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
|
|
|
400 *p++ = CR; *p = LF;
|
|
|
401
|
|
|
402 s->imap_state = ngx_pop3_passwd;
|
|
|
403 break;
|
|
|
404
|
|
212
|
405 case ngx_pop3_passwd:
|
|
|
406 s->connection->read->handler = ngx_imap_proxy_handler;
|
|
|
407 s->connection->write->handler = ngx_imap_proxy_handler;
|
|
|
408 rev->handler = ngx_imap_proxy_handler;
|
|
|
409 c->write->handler = ngx_imap_proxy_handler;
|
|
|
410
|
|
|
411 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
412 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
413 ngx_del_timer(c->read);
|
|
|
414
|
|
|
415 c->log->action = NULL;
|
|
|
416 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
417
|
|
|
418 ngx_imap_proxy_handler(s->connection->write);
|
|
|
419
|
|
|
420 return;
|
|
|
421
|
|
76
|
422 default:
|
|
|
423 #if (NGX_SUPPRESS_WARN)
|
|
|
424 line.len = 0;
|
|
|
425 line.data = NULL;
|
|
|
426 #endif
|
|
|
427 break;
|
|
|
428 }
|
|
|
429
|
|
88
|
430 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
76
|
431 /*
|
|
|
432 * we treat the incomplete sending as NGX_ERROR
|
|
|
433 * because it is very strange here
|
|
|
434 */
|
|
|
435 ngx_imap_proxy_internal_server_error(s);
|
|
|
436 return;
|
|
|
437 }
|
|
|
438
|
|
|
439 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
440 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
441 }
|
|
|
442
|
|
|
443
|
|
|
444 static void
|
|
132
|
445 ngx_imap_proxy_dummy_handler(ngx_event_t *wev)
|
|
76
|
446 {
|
|
132
|
447 ngx_connection_t *c;
|
|
|
448 ngx_imap_session_t *s;
|
|
|
449
|
|
|
450 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, wev->log, 0, "imap proxy dummy handler");
|
|
|
451
|
|
|
452 if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
|
|
|
453 c = wev->data;
|
|
|
454 s = c->data;
|
|
|
455
|
|
|
456 ngx_imap_proxy_close_session(s);
|
|
|
457 }
|
|
76
|
458 }
|
|
|
459
|
|
|
460
|
|
|
461 static ngx_int_t
|
|
212
|
462 ngx_imap_proxy_read_response(ngx_imap_session_t *s, ngx_uint_t state)
|
|
76
|
463 {
|
|
258
|
464 u_char *p;
|
|
|
465 ssize_t n;
|
|
|
466 ngx_buf_t *b;
|
|
|
467 ngx_imap_proxy_conf_t *pcf;
|
|
76
|
468
|
|
136
|
469 s->connection->log->action = "reading response from upstream";
|
|
|
470
|
|
76
|
471 b = s->proxy->buffer;
|
|
|
472
|
|
88
|
473 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
|
474 b->last, b->end - b->last);
|
|
76
|
475
|
|
|
476 if (n == NGX_ERROR || n == 0) {
|
|
|
477 return NGX_ERROR;
|
|
|
478 }
|
|
|
479
|
|
|
480 if (n == NGX_AGAIN) {
|
|
|
481 return NGX_AGAIN;
|
|
|
482 }
|
|
|
483
|
|
|
484 b->last += n;
|
|
|
485
|
|
|
486 if (b->last - b->pos < 5) {
|
|
|
487 return NGX_AGAIN;
|
|
|
488 }
|
|
|
489
|
|
|
490 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
491 if (b->last == b->end) {
|
|
|
492 *(b->last - 1) = '\0';
|
|
|
493 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
494 "upstream sent too long response line: \"%s\"",
|
|
|
495 b->pos);
|
|
120
|
496 return NGX_ERROR;
|
|
76
|
497 }
|
|
|
498
|
|
|
499 return NGX_AGAIN;
|
|
|
500 }
|
|
|
501
|
|
|
502 p = b->pos;
|
|
|
503
|
|
|
504 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
|
|
|
505 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
506 return NGX_OK;
|
|
|
507 }
|
|
|
508
|
|
|
509 } else {
|
|
212
|
510 switch (state) {
|
|
|
511
|
|
|
512 case ngx_imap_start:
|
|
76
|
513 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
514 return NGX_OK;
|
|
|
515 }
|
|
212
|
516 break;
|
|
76
|
517
|
|
212
|
518 case ngx_imap_login:
|
|
|
519 case ngx_imap_user:
|
|
78
|
520 if (p[0] == '+') {
|
|
76
|
521 return NGX_OK;
|
|
|
522 }
|
|
212
|
523 break;
|
|
|
524
|
|
|
525 case ngx_imap_passwd:
|
|
|
526 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
|
527 p += s->tag.len;
|
|
|
528 if (p[0] == 'O' && p[1] == 'K') {
|
|
|
529 return NGX_OK;
|
|
|
530 }
|
|
|
531 }
|
|
|
532 break;
|
|
76
|
533 }
|
|
|
534 }
|
|
|
535
|
|
258
|
536 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
537
|
|
|
538 if (pcf->pass_error_message == 0) {
|
|
|
539 *(b->last - 2) = '\0';
|
|
|
540 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
541 "upstream sent invalid response: \"%s\"", p);
|
|
|
542 return NGX_ERROR;
|
|
|
543 }
|
|
|
544
|
|
|
545 s->out.len = b->last - p - 2;
|
|
|
546 s->out.data = p;
|
|
|
547
|
|
|
548 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
|
549 "upstream sent invalid response: \"%V\"", &s->out);
|
|
|
550
|
|
|
551 s->out.len = b->last - b->pos;
|
|
|
552 s->out.data = b->pos;
|
|
76
|
553
|
|
120
|
554 return NGX_ERROR;
|
|
76
|
555 }
|
|
|
556
|
|
|
557
|
|
|
558 static void
|
|
|
559 ngx_imap_proxy_handler(ngx_event_t *ev)
|
|
|
560 {
|
|
132
|
561 char *action, *recv_action, *send_action;
|
|
88
|
562 size_t size;
|
|
|
563 ssize_t n;
|
|
|
564 ngx_buf_t *b;
|
|
132
|
565 ngx_uint_t do_write;
|
|
88
|
566 ngx_connection_t *c, *src, *dst;
|
|
|
567 ngx_imap_session_t *s;
|
|
|
568 ngx_imap_proxy_conf_t *pcf;
|
|
76
|
569
|
|
|
570 c = ev->data;
|
|
|
571 s = c->data;
|
|
|
572
|
|
|
573 if (ev->timedout) {
|
|
132
|
574 c->log->action = "proxying";
|
|
|
575
|
|
76
|
576 if (c == s->connection) {
|
|
|
577 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
578 "client timed out");
|
|
126
|
579 c->timedout = 1;
|
|
|
580
|
|
76
|
581 } else {
|
|
|
582 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
583 "upstream timed out");
|
|
|
584 }
|
|
|
585
|
|
|
586 ngx_imap_proxy_close_session(s);
|
|
|
587 return;
|
|
|
588 }
|
|
|
589
|
|
|
590 if (c == s->connection) {
|
|
|
591 if (ev->write) {
|
|
132
|
592 recv_action = "proxying and reading from upstream";
|
|
|
593 send_action = "proxying and sending to client";
|
|
76
|
594 src = s->proxy->upstream.connection;
|
|
|
595 dst = c;
|
|
|
596 b = s->proxy->buffer;
|
|
|
597
|
|
|
598 } else {
|
|
132
|
599 recv_action = "proxying and reading from client";
|
|
|
600 send_action = "proxying and sending to upstream";
|
|
76
|
601 src = c;
|
|
|
602 dst = s->proxy->upstream.connection;
|
|
|
603 b = s->buffer;
|
|
|
604 }
|
|
|
605
|
|
|
606 } else {
|
|
|
607 if (ev->write) {
|
|
138
|
608 recv_action = "proxying and reading from client";
|
|
|
609 send_action = "proxying and sending to upstream";
|
|
76
|
610 src = s->connection;
|
|
|
611 dst = c;
|
|
|
612 b = s->buffer;
|
|
|
613
|
|
|
614 } else {
|
|
138
|
615 recv_action = "proxying and reading from upstream";
|
|
|
616 send_action = "proxying and sending to client";
|
|
76
|
617 src = c;
|
|
|
618 dst = s->connection;
|
|
|
619 b = s->proxy->buffer;
|
|
|
620 }
|
|
|
621 }
|
|
|
622
|
|
|
623 do_write = ev->write ? 1 : 0;
|
|
|
624
|
|
|
625 ngx_log_debug3(NGX_LOG_DEBUG_IMAP, ev->log, 0,
|
|
|
626 "imap proxy handler: %d, #%d > #%d",
|
|
|
627 do_write, src->fd, dst->fd);
|
|
|
628
|
|
132
|
629 for ( ;; ) {
|
|
76
|
630
|
|
132
|
631 if (do_write) {
|
|
76
|
632
|
|
|
633 size = b->last - b->pos;
|
|
|
634
|
|
|
635 if (size && dst->write->ready) {
|
|
132
|
636 c->log->action = send_action;
|
|
|
637
|
|
88
|
638 n = dst->send(dst, b->pos, size);
|
|
76
|
639
|
|
|
640 if (n == NGX_ERROR) {
|
|
|
641 ngx_imap_proxy_close_session(s);
|
|
|
642 return;
|
|
|
643 }
|
|
|
644
|
|
|
645 if (n > 0) {
|
|
|
646 b->pos += n;
|
|
|
647
|
|
|
648 if (b->pos == b->last) {
|
|
|
649 b->pos = b->start;
|
|
|
650 b->last = b->start;
|
|
|
651 }
|
|
|
652 }
|
|
|
653 }
|
|
|
654 }
|
|
|
655
|
|
|
656 size = b->end - b->last;
|
|
|
657
|
|
|
658 if (size && src->read->ready) {
|
|
132
|
659 c->log->action = recv_action;
|
|
|
660
|
|
88
|
661 n = src->recv(src, b->last, size);
|
|
76
|
662
|
|
132
|
663 if (n == NGX_AGAIN || n == 0) {
|
|
|
664 break;
|
|
76
|
665 }
|
|
|
666
|
|
|
667 if (n > 0) {
|
|
|
668 do_write = 1;
|
|
|
669 b->last += n;
|
|
132
|
670
|
|
|
671 continue;
|
|
76
|
672 }
|
|
|
673
|
|
132
|
674 if (n == NGX_ERROR) {
|
|
|
675 src->read->eof = 1;
|
|
88
|
676 }
|
|
76
|
677 }
|
|
|
678
|
|
132
|
679 break;
|
|
|
680 }
|
|
|
681
|
|
|
682 c->log->action = "proxying";
|
|
|
683
|
|
|
684 if ((s->connection->read->eof || s->proxy->upstream.connection->read->eof)
|
|
|
685 && s->buffer->pos == s->buffer->last
|
|
|
686 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|
687 {
|
|
|
688 action = c->log->action;
|
|
|
689 c->log->action = NULL;
|
|
|
690 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
|
691 c->log->action = action;
|
|
|
692
|
|
|
693 ngx_imap_proxy_close_session(s);
|
|
|
694 return;
|
|
|
695 }
|
|
|
696
|
|
|
697 if (ngx_handle_write_event(dst->write, 0) == NGX_ERROR) {
|
|
|
698 ngx_imap_proxy_close_session(s);
|
|
|
699 return;
|
|
|
700 }
|
|
|
701
|
|
|
702 if (ngx_handle_read_event(dst->read, 0) == NGX_ERROR) {
|
|
|
703 ngx_imap_proxy_close_session(s);
|
|
|
704 return;
|
|
|
705 }
|
|
|
706
|
|
|
707 if (ngx_handle_write_event(src->write, 0) == NGX_ERROR) {
|
|
|
708 ngx_imap_proxy_close_session(s);
|
|
|
709 return;
|
|
|
710 }
|
|
|
711
|
|
|
712 if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
|
|
|
713 ngx_imap_proxy_close_session(s);
|
|
|
714 return;
|
|
|
715 }
|
|
|
716
|
|
|
717 if (c == s->connection) {
|
|
|
718 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
719 ngx_add_timer(c->read, pcf->timeout);
|
|
|
720 }
|
|
76
|
721 }
|
|
|
722
|
|
|
723
|
|
|
724 static void
|
|
258
|
725 ngx_imap_proxy_upstream_error(ngx_imap_session_t *s)
|
|
|
726 {
|
|
|
727 if (s->proxy->upstream.connection) {
|
|
|
728 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
729 "close imap proxy connection: %d",
|
|
|
730 s->proxy->upstream.connection->fd);
|
|
|
731
|
|
|
732 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
733 }
|
|
|
734
|
|
|
735 if (s->out.len == 0) {
|
|
|
736 ngx_imap_session_internal_server_error(s);
|
|
|
737 return;
|
|
|
738 }
|
|
|
739
|
|
|
740 s->quit = 1;
|
|
|
741 ngx_imap_send(s->connection->write);
|
|
|
742 }
|
|
|
743
|
|
|
744
|
|
|
745 static void
|
|
76
|
746 ngx_imap_proxy_internal_server_error(ngx_imap_session_t *s)
|
|
|
747 {
|
|
|
748 if (s->proxy->upstream.connection) {
|
|
|
749 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
750 "close imap proxy connection: %d",
|
|
|
751 s->proxy->upstream.connection->fd);
|
|
|
752
|
|
|
753 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
754 }
|
|
|
755
|
|
|
756 ngx_imap_session_internal_server_error(s);
|
|
|
757 }
|
|
|
758
|
|
|
759
|
|
|
760 static void
|
|
|
761 ngx_imap_proxy_close_session(ngx_imap_session_t *s)
|
|
|
762 {
|
|
|
763 if (s->proxy->upstream.connection) {
|
|
|
764 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
765 "close imap proxy connection: %d",
|
|
|
766 s->proxy->upstream.connection->fd);
|
|
|
767
|
|
|
768 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
769 }
|
|
|
770
|
|
|
771 ngx_imap_close_connection(s->connection);
|
|
|
772 }
|
|
|
773
|
|
|
774
|
|
|
775 static void *
|
|
|
776 ngx_imap_proxy_create_conf(ngx_conf_t *cf)
|
|
126
|
777 {
|
|
76
|
778 ngx_imap_proxy_conf_t *pcf;
|
|
126
|
779
|
|
76
|
780 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_proxy_conf_t));
|
|
|
781 if (pcf == NULL) {
|
|
|
782 return NGX_CONF_ERROR;
|
|
|
783 }
|
|
|
784
|
|
|
785 pcf->enable = NGX_CONF_UNSET;
|
|
258
|
786 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
88
|
787 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
788 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
76
|
789
|
|
|
790 return pcf;
|
|
|
791 }
|
|
|
792
|
|
|
793
|
|
|
794 static char *
|
|
|
795 ngx_imap_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
796 {
|
|
|
797 ngx_imap_proxy_conf_t *prev = parent;
|
|
|
798 ngx_imap_proxy_conf_t *conf = child;
|
|
|
799
|
|
88
|
800 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
258
|
801 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
88
|
802 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
803 (size_t) ngx_pagesize);
|
|
|
804 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
76
|
805
|
|
|
806 return NGX_CONF_OK;
|
|
|
807 }
|
