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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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260
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97 ngx_imap_proxy_init(ngx_imap_session_t *s, ngx_peer_addr_t *peer)
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76
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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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260
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128 p->upstream.sockaddr = peer->sockaddr;
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129 p->upstream.socklen = peer->socklen;
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130 p->upstream.name = &peer->name;
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131 p->upstream.get = ngx_event_get_peer;
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76
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132 p->upstream.log = s->connection->log;
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133 p->upstream.log_error = NGX_ERROR_ERR;
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134
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135 rc = ngx_event_connect_peer(&p->upstream);
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136
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92
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137 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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138 ngx_imap_proxy_internal_server_error(s);
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76
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139 return;
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140 }
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141
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142 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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143
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144 p->upstream.connection->data = s;
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145 p->upstream.connection->pool = s->connection->pool;
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146
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147 s->connection->read->handler = ngx_imap_proxy_block_read;
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148 p->upstream.connection->write->handler = ngx_imap_proxy_dummy_handler;
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149
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150 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
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151 p->upstream.connection->read->handler = ngx_imap_proxy_pop3_handler;
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152 s->imap_state = ngx_pop3_start;
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153
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154 } else {
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155 p->upstream.connection->read->handler = ngx_imap_proxy_imap_handler;
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156 s->imap_state = ngx_imap_start;
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157 }
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158 }
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159
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160
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161 static void
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162 ngx_imap_proxy_block_read(ngx_event_t *rev)
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163 {
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164 ngx_connection_t *c;
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165 ngx_imap_session_t *s;
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166
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167 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy block read");
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168
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169 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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170 c = rev->data;
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171 s = c->data;
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172
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173 ngx_imap_proxy_close_session(s);
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174 }
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175 }
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176
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177
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178 static void
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179 ngx_imap_proxy_imap_handler(ngx_event_t *rev)
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180 {
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88
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181 u_char *p;
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182 ngx_int_t rc;
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183 ngx_str_t line;
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184 ngx_connection_t *c;
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185 ngx_imap_session_t *s;
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186 ngx_imap_proxy_conf_t *pcf;
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76
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187
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188 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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189 "imap proxy imap auth handler");
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190
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191 c = rev->data;
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192 s = c->data;
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193
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194 if (rev->timedout) {
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195 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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196 "upstream timed out");
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126
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197 c->timedout = 1;
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76
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198 ngx_imap_proxy_internal_server_error(s);
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199 return;
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200 }
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201
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202 if (s->proxy->buffer == NULL) {
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88
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203 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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76
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204
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88
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205 s->proxy->buffer = ngx_create_temp_buf(c->pool, pcf->buffer_size);
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76
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206 if (s->proxy->buffer == NULL) {
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207 ngx_imap_proxy_internal_server_error(s);
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208 return;
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209 }
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210 }
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211
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212
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212 rc = ngx_imap_proxy_read_response(s, s->imap_state);
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76
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213
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214 if (rc == NGX_AGAIN) {
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215 return;
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216 }
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217
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120
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218 if (rc == NGX_ERROR) {
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258
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219 ngx_imap_proxy_upstream_error(s);
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76
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220 return;
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221 }
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222
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223 switch (s->imap_state) {
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224
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225 case ngx_imap_start:
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226 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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227 "imap proxy send login");
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228
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136
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229 s->connection->log->action = "sending LOGIN command to upstream";
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230
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76
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231 line.len = s->tag.len + sizeof("LOGIN ") - 1
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232 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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233 line.data = ngx_palloc(c->pool, line.len);
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234 if (line.data == NULL) {
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235 ngx_imap_proxy_internal_server_error(s);
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236 return;
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237 }
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238
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239 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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240 &s->tag, s->login.len)
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241 - line.data;
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242
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243 s->imap_state = ngx_imap_login;
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244 break;
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245
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246 case ngx_imap_login:
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247 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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248
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136
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249 s->connection->log->action = "sending user name to upstream";
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250
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78
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251 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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76
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252 line.data = ngx_palloc(c->pool, line.len);
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253 if (line.data == NULL) {
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254 ngx_imap_proxy_internal_server_error(s);
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255 return;
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256 }
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257
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78
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258 line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
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76
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259 &s->login, s->passwd.len)
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260 - line.data;
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261
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262 s->imap_state = ngx_imap_user;
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263 break;
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264
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265 case ngx_imap_user:
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266 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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267 "imap proxy send passwd");
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268
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136
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269 s->connection->log->action = "sending password to upstream";
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270
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76
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271 line.len = s->passwd.len + 2;
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272 line.data = ngx_palloc(c->pool, line.len);
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273 if (line.data == NULL) {
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274 ngx_imap_proxy_internal_server_error(s);
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275 return;
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276 }
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277
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278 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
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279 *p++ = CR; *p = LF;
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280
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281 s->imap_state = ngx_imap_passwd;
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282 break;
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283
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212
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284 case ngx_imap_passwd:
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285 s->connection->read->handler = ngx_imap_proxy_handler;
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286 s->connection->write->handler = ngx_imap_proxy_handler;
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287 rev->handler = ngx_imap_proxy_handler;
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288 c->write->handler = ngx_imap_proxy_handler;
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289
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290 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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291 ngx_add_timer(s->connection->read, pcf->timeout);
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292 ngx_del_timer(c->read);
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293
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294 c->log->action = NULL;
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295 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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296
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297 ngx_imap_proxy_handler(s->connection->write);
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298
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299 return;
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300
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76
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301 default:
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302 #if (NGX_SUPPRESS_WARN)
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303 line.len = 0;
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304 line.data = NULL;
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305 #endif
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306 break;
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307 }
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308
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88
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309 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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76
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310 /*
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311 * we treat the incomplete sending as NGX_ERROR
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312 * because it is very strange here
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313 */
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314 ngx_imap_proxy_internal_server_error(s);
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315 return;
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316 }
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317
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318 s->proxy->buffer->pos = s->proxy->buffer->start;
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319 s->proxy->buffer->last = s->proxy->buffer->start;
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320 }
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321
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322
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323 static void
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324 ngx_imap_proxy_pop3_handler(ngx_event_t *rev)
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325 {
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88
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326 u_char *p;
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327 ngx_int_t rc;
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328 ngx_str_t line;
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329 ngx_connection_t *c;
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330 ngx_imap_session_t *s;
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331 ngx_imap_proxy_conf_t *pcf;
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76
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332
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333 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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334 "imap proxy pop3 auth handler");
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335
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336 c = rev->data;
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337 s = c->data;
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338
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339 if (rev->timedout) {
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340 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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341 "upstream timed out");
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126
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342 c->timedout = 1;
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76
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343 ngx_imap_proxy_internal_server_error(s);
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344 return;
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345 }
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346
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347 if (s->proxy->buffer == NULL) {
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88
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348 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
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76
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349
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88
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350 s->proxy->buffer = ngx_create_temp_buf(c->pool, pcf->buffer_size);
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76
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351 if (s->proxy->buffer == NULL) {
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352 ngx_imap_proxy_internal_server_error(s);
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353 return;
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354 }
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355 }
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356
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212
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357 rc = ngx_imap_proxy_read_response(s, 0);
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76
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358
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359 if (rc == NGX_AGAIN) {
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360 return;
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361 }
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362
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120
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363 if (rc == NGX_ERROR) {
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258
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364 ngx_imap_proxy_upstream_error(s);
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76
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365 return;
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366 }
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367
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368 switch (s->imap_state) {
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369
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370 case ngx_pop3_start:
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371 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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372
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136
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373 s->connection->log->action = "sending user name to upstream";
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374
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76
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375 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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376 line.data = ngx_palloc(c->pool, line.len);
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377 if (line.data == NULL) {
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378 ngx_imap_proxy_internal_server_error(s);
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379 return;
|
|
|
380 }
|
|
|
381
|
|
|
382 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
|
|
|
383 p = ngx_cpymem(p, s->login.data, s->login.len);
|
|
|
384 *p++ = CR; *p = LF;
|
|
|
385
|
|
|
386 s->imap_state = ngx_pop3_user;
|
|
|
387 break;
|
|
|
388
|
|
|
389 case ngx_pop3_user:
|
|
|
390 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send pass");
|
|
|
391
|
|
136
|
392 s->connection->log->action = "sending password to upstream";
|
|
|
393
|
|
76
|
394 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
|
|
|
395 line.data = ngx_palloc(c->pool, line.len);
|
|
|
396 if (line.data == NULL) {
|
|
|
397 ngx_imap_proxy_internal_server_error(s);
|
|
|
398 return;
|
|
|
399 }
|
|
|
400
|
|
|
401 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
|
|
|
402 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
|
|
|
403 *p++ = CR; *p = LF;
|
|
|
404
|
|
|
405 s->imap_state = ngx_pop3_passwd;
|
|
|
406 break;
|
|
|
407
|
|
212
|
408 case ngx_pop3_passwd:
|
|
|
409 s->connection->read->handler = ngx_imap_proxy_handler;
|
|
|
410 s->connection->write->handler = ngx_imap_proxy_handler;
|
|
|
411 rev->handler = ngx_imap_proxy_handler;
|
|
|
412 c->write->handler = ngx_imap_proxy_handler;
|
|
|
413
|
|
|
414 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
415 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
416 ngx_del_timer(c->read);
|
|
|
417
|
|
|
418 c->log->action = NULL;
|
|
|
419 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
420
|
|
|
421 ngx_imap_proxy_handler(s->connection->write);
|
|
|
422
|
|
|
423 return;
|
|
|
424
|
|
76
|
425 default:
|
|
|
426 #if (NGX_SUPPRESS_WARN)
|
|
|
427 line.len = 0;
|
|
|
428 line.data = NULL;
|
|
|
429 #endif
|
|
|
430 break;
|
|
|
431 }
|
|
|
432
|
|
88
|
433 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
76
|
434 /*
|
|
|
435 * we treat the incomplete sending as NGX_ERROR
|
|
|
436 * because it is very strange here
|
|
|
437 */
|
|
|
438 ngx_imap_proxy_internal_server_error(s);
|
|
|
439 return;
|
|
|
440 }
|
|
|
441
|
|
|
442 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
443 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static void
|
|
132
|
448 ngx_imap_proxy_dummy_handler(ngx_event_t *wev)
|
|
76
|
449 {
|
|
132
|
450 ngx_connection_t *c;
|
|
|
451 ngx_imap_session_t *s;
|
|
|
452
|
|
|
453 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, wev->log, 0, "imap proxy dummy handler");
|
|
|
454
|
|
|
455 if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
|
|
|
456 c = wev->data;
|
|
|
457 s = c->data;
|
|
|
458
|
|
|
459 ngx_imap_proxy_close_session(s);
|
|
|
460 }
|
|
76
|
461 }
|
|
|
462
|
|
|
463
|
|
|
464 static ngx_int_t
|
|
212
|
465 ngx_imap_proxy_read_response(ngx_imap_session_t *s, ngx_uint_t state)
|
|
76
|
466 {
|
|
258
|
467 u_char *p;
|
|
|
468 ssize_t n;
|
|
|
469 ngx_buf_t *b;
|
|
|
470 ngx_imap_proxy_conf_t *pcf;
|
|
76
|
471
|
|
136
|
472 s->connection->log->action = "reading response from upstream";
|
|
|
473
|
|
76
|
474 b = s->proxy->buffer;
|
|
|
475
|
|
88
|
476 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
|
477 b->last, b->end - b->last);
|
|
76
|
478
|
|
|
479 if (n == NGX_ERROR || n == 0) {
|
|
|
480 return NGX_ERROR;
|
|
|
481 }
|
|
|
482
|
|
|
483 if (n == NGX_AGAIN) {
|
|
|
484 return NGX_AGAIN;
|
|
|
485 }
|
|
|
486
|
|
|
487 b->last += n;
|
|
|
488
|
|
|
489 if (b->last - b->pos < 5) {
|
|
|
490 return NGX_AGAIN;
|
|
|
491 }
|
|
|
492
|
|
|
493 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
494 if (b->last == b->end) {
|
|
|
495 *(b->last - 1) = '\0';
|
|
|
496 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
497 "upstream sent too long response line: \"%s\"",
|
|
|
498 b->pos);
|
|
120
|
499 return NGX_ERROR;
|
|
76
|
500 }
|
|
|
501
|
|
|
502 return NGX_AGAIN;
|
|
|
503 }
|
|
|
504
|
|
|
505 p = b->pos;
|
|
|
506
|
|
|
507 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
|
|
|
508 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
509 return NGX_OK;
|
|
|
510 }
|
|
|
511
|
|
|
512 } else {
|
|
212
|
513 switch (state) {
|
|
|
514
|
|
|
515 case ngx_imap_start:
|
|
76
|
516 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
517 return NGX_OK;
|
|
|
518 }
|
|
212
|
519 break;
|
|
76
|
520
|
|
212
|
521 case ngx_imap_login:
|
|
|
522 case ngx_imap_user:
|
|
78
|
523 if (p[0] == '+') {
|
|
76
|
524 return NGX_OK;
|
|
|
525 }
|
|
212
|
526 break;
|
|
|
527
|
|
|
528 case ngx_imap_passwd:
|
|
|
529 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
|
530 p += s->tag.len;
|
|
|
531 if (p[0] == 'O' && p[1] == 'K') {
|
|
|
532 return NGX_OK;
|
|
|
533 }
|
|
|
534 }
|
|
|
535 break;
|
|
76
|
536 }
|
|
|
537 }
|
|
|
538
|
|
258
|
539 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
540
|
|
|
541 if (pcf->pass_error_message == 0) {
|
|
|
542 *(b->last - 2) = '\0';
|
|
|
543 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
544 "upstream sent invalid response: \"%s\"", p);
|
|
|
545 return NGX_ERROR;
|
|
|
546 }
|
|
|
547
|
|
|
548 s->out.len = b->last - p - 2;
|
|
|
549 s->out.data = p;
|
|
|
550
|
|
|
551 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
|
552 "upstream sent invalid response: \"%V\"", &s->out);
|
|
|
553
|
|
|
554 s->out.len = b->last - b->pos;
|
|
|
555 s->out.data = b->pos;
|
|
76
|
556
|
|
120
|
557 return NGX_ERROR;
|
|
76
|
558 }
|
|
|
559
|
|
|
560
|
|
|
561 static void
|
|
|
562 ngx_imap_proxy_handler(ngx_event_t *ev)
|
|
|
563 {
|
|
132
|
564 char *action, *recv_action, *send_action;
|
|
88
|
565 size_t size;
|
|
|
566 ssize_t n;
|
|
|
567 ngx_buf_t *b;
|
|
132
|
568 ngx_uint_t do_write;
|
|
88
|
569 ngx_connection_t *c, *src, *dst;
|
|
|
570 ngx_imap_session_t *s;
|
|
|
571 ngx_imap_proxy_conf_t *pcf;
|
|
76
|
572
|
|
|
573 c = ev->data;
|
|
|
574 s = c->data;
|
|
|
575
|
|
|
576 if (ev->timedout) {
|
|
132
|
577 c->log->action = "proxying";
|
|
|
578
|
|
76
|
579 if (c == s->connection) {
|
|
|
580 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
581 "client timed out");
|
|
126
|
582 c->timedout = 1;
|
|
|
583
|
|
76
|
584 } else {
|
|
|
585 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
586 "upstream timed out");
|
|
|
587 }
|
|
|
588
|
|
|
589 ngx_imap_proxy_close_session(s);
|
|
|
590 return;
|
|
|
591 }
|
|
|
592
|
|
|
593 if (c == s->connection) {
|
|
|
594 if (ev->write) {
|
|
132
|
595 recv_action = "proxying and reading from upstream";
|
|
|
596 send_action = "proxying and sending to client";
|
|
76
|
597 src = s->proxy->upstream.connection;
|
|
|
598 dst = c;
|
|
|
599 b = s->proxy->buffer;
|
|
|
600
|
|
|
601 } else {
|
|
132
|
602 recv_action = "proxying and reading from client";
|
|
|
603 send_action = "proxying and sending to upstream";
|
|
76
|
604 src = c;
|
|
|
605 dst = s->proxy->upstream.connection;
|
|
|
606 b = s->buffer;
|
|
|
607 }
|
|
|
608
|
|
|
609 } else {
|
|
|
610 if (ev->write) {
|
|
138
|
611 recv_action = "proxying and reading from client";
|
|
|
612 send_action = "proxying and sending to upstream";
|
|
76
|
613 src = s->connection;
|
|
|
614 dst = c;
|
|
|
615 b = s->buffer;
|
|
|
616
|
|
|
617 } else {
|
|
138
|
618 recv_action = "proxying and reading from upstream";
|
|
|
619 send_action = "proxying and sending to client";
|
|
76
|
620 src = c;
|
|
|
621 dst = s->connection;
|
|
|
622 b = s->proxy->buffer;
|
|
|
623 }
|
|
|
624 }
|
|
|
625
|
|
|
626 do_write = ev->write ? 1 : 0;
|
|
|
627
|
|
|
628 ngx_log_debug3(NGX_LOG_DEBUG_IMAP, ev->log, 0,
|
|
|
629 "imap proxy handler: %d, #%d > #%d",
|
|
|
630 do_write, src->fd, dst->fd);
|
|
|
631
|
|
132
|
632 for ( ;; ) {
|
|
76
|
633
|
|
132
|
634 if (do_write) {
|
|
76
|
635
|
|
|
636 size = b->last - b->pos;
|
|
|
637
|
|
|
638 if (size && dst->write->ready) {
|
|
132
|
639 c->log->action = send_action;
|
|
|
640
|
|
88
|
641 n = dst->send(dst, b->pos, size);
|
|
76
|
642
|
|
|
643 if (n == NGX_ERROR) {
|
|
|
644 ngx_imap_proxy_close_session(s);
|
|
|
645 return;
|
|
|
646 }
|
|
|
647
|
|
|
648 if (n > 0) {
|
|
|
649 b->pos += n;
|
|
|
650
|
|
|
651 if (b->pos == b->last) {
|
|
|
652 b->pos = b->start;
|
|
|
653 b->last = b->start;
|
|
|
654 }
|
|
|
655 }
|
|
|
656 }
|
|
|
657 }
|
|
|
658
|
|
|
659 size = b->end - b->last;
|
|
|
660
|
|
|
661 if (size && src->read->ready) {
|
|
132
|
662 c->log->action = recv_action;
|
|
|
663
|
|
88
|
664 n = src->recv(src, b->last, size);
|
|
76
|
665
|
|
132
|
666 if (n == NGX_AGAIN || n == 0) {
|
|
|
667 break;
|
|
76
|
668 }
|
|
|
669
|
|
|
670 if (n > 0) {
|
|
|
671 do_write = 1;
|
|
|
672 b->last += n;
|
|
132
|
673
|
|
|
674 continue;
|
|
76
|
675 }
|
|
|
676
|
|
132
|
677 if (n == NGX_ERROR) {
|
|
|
678 src->read->eof = 1;
|
|
88
|
679 }
|
|
76
|
680 }
|
|
|
681
|
|
132
|
682 break;
|
|
|
683 }
|
|
|
684
|
|
|
685 c->log->action = "proxying";
|
|
|
686
|
|
|
687 if ((s->connection->read->eof || s->proxy->upstream.connection->read->eof)
|
|
|
688 && s->buffer->pos == s->buffer->last
|
|
|
689 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|
690 {
|
|
|
691 action = c->log->action;
|
|
|
692 c->log->action = NULL;
|
|
|
693 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
|
694 c->log->action = action;
|
|
|
695
|
|
|
696 ngx_imap_proxy_close_session(s);
|
|
|
697 return;
|
|
|
698 }
|
|
|
699
|
|
|
700 if (ngx_handle_write_event(dst->write, 0) == NGX_ERROR) {
|
|
|
701 ngx_imap_proxy_close_session(s);
|
|
|
702 return;
|
|
|
703 }
|
|
|
704
|
|
|
705 if (ngx_handle_read_event(dst->read, 0) == NGX_ERROR) {
|
|
|
706 ngx_imap_proxy_close_session(s);
|
|
|
707 return;
|
|
|
708 }
|
|
|
709
|
|
|
710 if (ngx_handle_write_event(src->write, 0) == NGX_ERROR) {
|
|
|
711 ngx_imap_proxy_close_session(s);
|
|
|
712 return;
|
|
|
713 }
|
|
|
714
|
|
|
715 if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
|
|
|
716 ngx_imap_proxy_close_session(s);
|
|
|
717 return;
|
|
|
718 }
|
|
|
719
|
|
|
720 if (c == s->connection) {
|
|
|
721 pcf = ngx_imap_get_module_srv_conf(s, ngx_imap_proxy_module);
|
|
|
722 ngx_add_timer(c->read, pcf->timeout);
|
|
|
723 }
|
|
76
|
724 }
|
|
|
725
|
|
|
726
|
|
|
727 static void
|
|
258
|
728 ngx_imap_proxy_upstream_error(ngx_imap_session_t *s)
|
|
|
729 {
|
|
|
730 if (s->proxy->upstream.connection) {
|
|
|
731 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
732 "close imap proxy connection: %d",
|
|
|
733 s->proxy->upstream.connection->fd);
|
|
|
734
|
|
|
735 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
736 }
|
|
|
737
|
|
|
738 if (s->out.len == 0) {
|
|
|
739 ngx_imap_session_internal_server_error(s);
|
|
|
740 return;
|
|
|
741 }
|
|
|
742
|
|
|
743 s->quit = 1;
|
|
|
744 ngx_imap_send(s->connection->write);
|
|
|
745 }
|
|
|
746
|
|
|
747
|
|
|
748 static void
|
|
76
|
749 ngx_imap_proxy_internal_server_error(ngx_imap_session_t *s)
|
|
|
750 {
|
|
|
751 if (s->proxy->upstream.connection) {
|
|
|
752 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
753 "close imap proxy connection: %d",
|
|
|
754 s->proxy->upstream.connection->fd);
|
|
|
755
|
|
|
756 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
757 }
|
|
|
758
|
|
|
759 ngx_imap_session_internal_server_error(s);
|
|
|
760 }
|
|
|
761
|
|
|
762
|
|
|
763 static void
|
|
|
764 ngx_imap_proxy_close_session(ngx_imap_session_t *s)
|
|
|
765 {
|
|
|
766 if (s->proxy->upstream.connection) {
|
|
|
767 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
768 "close imap proxy connection: %d",
|
|
|
769 s->proxy->upstream.connection->fd);
|
|
|
770
|
|
|
771 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
772 }
|
|
|
773
|
|
|
774 ngx_imap_close_connection(s->connection);
|
|
|
775 }
|
|
|
776
|
|
|
777
|
|
|
778 static void *
|
|
|
779 ngx_imap_proxy_create_conf(ngx_conf_t *cf)
|
|
126
|
780 {
|
|
76
|
781 ngx_imap_proxy_conf_t *pcf;
|
|
126
|
782
|
|
76
|
783 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_proxy_conf_t));
|
|
|
784 if (pcf == NULL) {
|
|
|
785 return NGX_CONF_ERROR;
|
|
|
786 }
|
|
|
787
|
|
|
788 pcf->enable = NGX_CONF_UNSET;
|
|
258
|
789 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
88
|
790 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
791 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
76
|
792
|
|
|
793 return pcf;
|
|
|
794 }
|
|
|
795
|
|
|
796
|
|
|
797 static char *
|
|
|
798 ngx_imap_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
799 {
|
|
|
800 ngx_imap_proxy_conf_t *prev = parent;
|
|
|
801 ngx_imap_proxy_conf_t *conf = child;
|
|
|
802
|
|
88
|
803 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
258
|
804 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
88
|
805 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
806 (size_t) ngx_pagesize);
|
|
|
807 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
76
|
808
|
|
|
809 return NGX_CONF_OK;
|
|
|
810 }
|
