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0
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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_event_pipe.h>
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12 #include <ngx_http.h>
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13 #include <ngx_http_proxy_handler.h>
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14
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15
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16 static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p);
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17 static void ngx_http_proxy_init_upstream(void *data);
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18 static void ngx_http_proxy_reinit_upstream(ngx_http_proxy_ctx_t *p);
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19 static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p);
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20 static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p);
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21 static void ngx_http_proxy_send_request_handler(ngx_event_t *wev);
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22 static void ngx_http_proxy_dummy_handler(ngx_event_t *wev);
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23 static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev);
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24 static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev);
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25 static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *);
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26 static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p);
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27 static void ngx_http_proxy_process_body(ngx_event_t *ev);
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28 static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type);
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29
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30
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31 static ngx_str_t http_methods[] = {
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32 ngx_string("GET "),
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33 ngx_string("HEAD "),
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34 ngx_string("POST ")
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35 };
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36
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37
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38 static char *upstream_header_errors[] = {
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39 "upstream sent invalid header",
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40 "upstream sent too long header line"
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41 };
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42
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43
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44 static char http_version[] = " HTTP/1.0" CRLF;
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45 static char host_header[] = "Host: ";
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46 static char x_real_ip_header[] = "X-Real-IP: ";
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47 static char x_forwarded_for_header[] = "X-Forwarded-For: ";
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48 static char connection_close_header[] = "Connection: close" CRLF;
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49
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50
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51 int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p)
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52 {
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53 int rc;
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54 ngx_temp_file_t *tf;
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55 ngx_http_request_t *r;
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56 ngx_http_request_body_t *rb;
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57 ngx_http_proxy_upstream_t *u;
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58
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59 r = p->request;
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60
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61 if (!(u = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_upstream_t)))) {
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62 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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63 }
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64
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65 p->upstream = u;
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66
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67 u->peer.log_error = NGX_ERROR_ERR;
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68 u->peer.peers = p->lcf->peers;
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69 u->peer.tries = p->lcf->peers->number;
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70 #if (NGX_THREADS)
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71 u->peer.lock = &r->connection->lock;
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72 #endif
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73
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74 u->method = r->method;
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75
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76 if (!(rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t)))) {
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77 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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78 }
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79 r->request_body = rb;
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80
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81 if (r->headers_in.content_length_n <= 0) {
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82 ngx_http_proxy_init_upstream(p);
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83 return NGX_DONE;
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84 }
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85
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86 if (!(tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) {
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87 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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88 }
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89
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90 tf->file.fd = NGX_INVALID_FILE;
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91 tf->file.log = r->connection->log;
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92 tf->path = p->lcf->temp_path;
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93 tf->pool = r->pool;
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94 tf->warn = "a client request body is buffered to a temporary file";
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95 /* tf->persistent = 0; */
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96
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97 rb->handler = ngx_http_proxy_init_upstream;
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98 rb->data = p;
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99 /* rb->bufs = NULL; */
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100 /* rb->buf = NULL; */
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101 /* rb->rest = 0; */
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102
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103 rb->temp_file = tf;
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104
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105 rc = ngx_http_read_client_request_body(r);
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106
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107 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
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108 return rc;
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109 }
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110
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111 return NGX_DONE;
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112 }
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113
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114
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115 static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p)
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116 {
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117 size_t len;
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118 ngx_uint_t i;
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119 ngx_buf_t *b;
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120 ngx_chain_t *chain;
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121 ngx_list_part_t *part;
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122 ngx_table_elt_t *header;
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123 ngx_http_request_t *r;
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124 ngx_http_proxy_upstream_conf_t *uc;
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125
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126 r = p->request;
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127 uc = p->lcf->upstream;
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128
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129 if (p->upstream->method) {
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130 len = http_methods[p->upstream->method - 1].len;
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131
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132 } else {
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133 len = r->method_name.len;
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134 }
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135
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136 len += uc->uri.len
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137 + r->uri.len - uc->location->len
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138 + 1 + r->args.len /* 1 is for "?" */
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139 + sizeof(http_version) - 1
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140 + sizeof(connection_close_header) - 1
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141 + 2; /* 2 is for "\r\n" at the header end */
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142
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143
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144 if (p->lcf->preserve_host && r->headers_in.host) {
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145 len += sizeof(host_header) - 1
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146 + r->headers_in.host_name_len
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147 + 1 /* 1 is for ":" */
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148 + uc->port_text.len
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149 + 2; /* 2 is for "\r\n" */
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150 } else { /* 2 is for "\r\n" */
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151 len += sizeof(host_header) - 1 + uc->host_header.len + 2;
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152 }
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153
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154
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155 if (p->lcf->set_x_real_ip) { /* 2 is for "\r\n" */
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156 len += sizeof(x_real_ip_header) - 1 + INET_ADDRSTRLEN - 1 + 2;
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157 }
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158
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159
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160 if (p->lcf->add_x_forwarded_for) {
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161 if (r->headers_in.x_forwarded_for) {
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162 len += sizeof(x_forwarded_for_header) - 1
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163 + r->headers_in.x_forwarded_for->value.len
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164 + 2 /* 2 is ofr ", " */
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165 + INET_ADDRSTRLEN - 1
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166 + 2; /* 2 is for "\r\n" */
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167 } else {
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168 len += sizeof(x_forwarded_for_header) - 1 + INET_ADDRSTRLEN - 1 + 2;
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169 /* 2 is for "\r\n" */
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170 }
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171 }
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172
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173
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174 part = &r->headers_in.headers.part;
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175 header = part->elts;
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176
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177 for (i = 0; /* void */; i++) {
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178
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179 if (i >= part->nelts) {
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180 if (part->next == NULL) {
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181 break;
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182 }
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183
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184 part = part->next;
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185 header = part->elts;
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186 i = 0;
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187 }
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188
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189 if (&header[i] == r->headers_in.host) {
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190 continue;
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191 }
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192
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193 if (&header[i] == r->headers_in.connection) {
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194 continue;
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195 }
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196
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197 /* 2 is for ": " and 2 is for "\r\n" */
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198 len += header[i].key.len + 2 + header[i].value.len + 2;
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199 }
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200
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201 #if (NGX_DEBUG)
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202 len++;
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203 #endif
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204
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205 ngx_test_null(b, ngx_create_temp_buf(r->pool, len), NULL);
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206 ngx_alloc_link_and_set_buf(chain, b, r->pool, NULL);
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207
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208
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209 /* the request line */
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210
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211 if (p->upstream->method) {
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212 b->last = ngx_cpymem(b->last,
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213 http_methods[p->upstream->method - 1].data,
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214 http_methods[p->upstream->method - 1].len);
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215 } else {
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216 b->last = ngx_cpymem(b->last, r->method_name.data, r->method_name.len);
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217 }
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218
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219 b->last = ngx_cpymem(b->last, uc->uri.data, uc->uri.len);
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220
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221 b->last = ngx_cpymem(b->last,
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222 r->uri.data + uc->location->len,
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223 r->uri.len - uc->location->len);
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224
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225 if (r->args.len > 0) {
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226 *(b->last++) = '?';
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227 b->last = ngx_cpymem(b->last, r->args.data, r->args.len);
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228 }
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229
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230 b->last = ngx_cpymem(b->last, http_version, sizeof(http_version) - 1);
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231
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232
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233 /* the "Connection: close" header */
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234
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235 b->last = ngx_cpymem(b->last, connection_close_header,
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236 sizeof(connection_close_header) - 1);
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237
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238
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239 /* the "Host" header */
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240
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241 b->last = ngx_cpymem(b->last, host_header, sizeof(host_header) - 1);
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242
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243 if (p->lcf->preserve_host && r->headers_in.host) {
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244 b->last = ngx_cpymem(b->last, r->headers_in.host->value.data,
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245 r->headers_in.host_name_len);
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246
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247 if (!uc->default_port) {
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248 *(b->last++) = ':';
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249 b->last = ngx_cpymem(b->last, uc->port_text.data,
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250 uc->port_text.len);
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251 }
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252
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253 } else {
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254 b->last = ngx_cpymem(b->last, uc->host_header.data,
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255 uc->host_header.len);
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256 }
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257 *(b->last++) = CR; *(b->last++) = LF;
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258
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259
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260 /* the "X-Real-IP" header */
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261
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262 if (p->lcf->set_x_real_ip) {
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263 b->last = ngx_cpymem(b->last, x_real_ip_header,
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264 sizeof(x_real_ip_header) - 1);
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265 b->last = ngx_cpymem(b->last, r->connection->addr_text.data,
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266 r->connection->addr_text.len);
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267 *(b->last++) = CR; *(b->last++) = LF;
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268 }
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269
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270
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271 /* the "X-Forwarded-For" header */
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272
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273 if (p->lcf->add_x_forwarded_for) {
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274 if (r->headers_in.x_forwarded_for) {
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275 b->last = ngx_cpymem(b->last, x_forwarded_for_header,
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276 sizeof(x_forwarded_for_header) - 1);
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277
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278 b->last = ngx_cpymem(b->last,
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279 r->headers_in.x_forwarded_for->value.data,
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280 r->headers_in.x_forwarded_for->value.len);
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281
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282 *(b->last++) = ','; *(b->last++) = ' ';
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283
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284 } else {
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285 b->last = ngx_cpymem(b->last, x_forwarded_for_header,
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286 sizeof(x_forwarded_for_header) - 1);
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287 }
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288
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289 b->last = ngx_cpymem(b->last, r->connection->addr_text.data,
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290 r->connection->addr_text.len);
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291 *(b->last++) = CR; *(b->last++) = LF;
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292 }
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293
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294
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295 part = &r->headers_in.headers.part;
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296 header = part->elts;
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297
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298 for (i = 0; /* void */; i++) {
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299
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300 if (i >= part->nelts) {
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301 if (part->next == NULL) {
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302 break;
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303 }
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304
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305 part = part->next;
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306 header = part->elts;
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307 i = 0;
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308 }
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309
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310 if (&header[i] == r->headers_in.host) {
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311 continue;
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312 }
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313
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314 if (&header[i] == r->headers_in.connection) {
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315 continue;
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316 }
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317
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318 if (&header[i] == r->headers_in.keep_alive) {
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319 continue;
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320 }
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321
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322 if (&header[i] == r->headers_in.x_forwarded_for
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323 && p->lcf->add_x_forwarded_for)
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324 {
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325 continue;
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326 }
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327
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328 b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len);
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329
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330 *(b->last++) = ':'; *(b->last++) = ' ';
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331
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332 b->last = ngx_cpymem(b->last, header[i].value.data,
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333 header[i].value.len);
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334
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335 *(b->last++) = CR; *(b->last++) = LF;
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336
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337 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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338 "http proxy header: \"%s: %s\"",
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339 header[i].key.data, header[i].value.data);
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340 }
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341
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342 /* add "\r\n" at the header end */
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343 *(b->last++) = CR; *(b->last++) = LF;
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344
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345 #if (NGX_DEBUG)
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346 *(b->last) = '\0';
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347 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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348 "http proxy header:\n\"%s\"", b->pos);
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349 #endif
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350
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351 return chain;
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352 }
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353
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354
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355 static void ngx_http_proxy_init_upstream(void *data)
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356 {
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357 ngx_http_proxy_ctx_t *p = data;
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358
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359 ngx_chain_t *cl;
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360 ngx_http_request_t *r;
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361 ngx_output_chain_ctx_t *output;
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362 ngx_chain_writer_ctx_t *writer;
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363 ngx_http_proxy_log_ctx_t *ctx;
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364
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365 r = p->request;
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366
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367 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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368 "http proxy init upstream, client timer: %d",
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369 r->connection->read->timer_set);
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370
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371 if (r->connection->read->timer_set) {
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372 ngx_del_timer(r->connection->read);
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373 }
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374
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375 r->connection->read->event_handler = ngx_http_proxy_check_broken_connection;
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376
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377 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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378
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379 r->connection->write->event_handler =
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380 ngx_http_proxy_check_broken_connection;
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381
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382 if (!r->connection->write->active) {
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383 if (ngx_add_event(r->connection->write, NGX_WRITE_EVENT,
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384 NGX_CLEAR_EVENT) == NGX_ERROR)
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385 {
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386 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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387 return;
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388 }
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389 }
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390 }
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391
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392
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393 if (!(cl = ngx_http_proxy_create_request(p))) {
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394 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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|
395 return;
|
|
|
396 }
|
|
|
397
|
|
|
398 if (r->request_body->bufs) {
|
|
|
399 cl->next = r->request_body->bufs;
|
|
|
400 }
|
|
|
401
|
|
|
402 r->request_body->bufs = cl;
|
|
|
403
|
|
|
404 if (!(ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_log_ctx_t)))) {
|
|
|
405 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
406 return;
|
|
|
407 }
|
|
|
408 ctx->connection = r->connection->number;
|
|
|
409 ctx->proxy = p;
|
|
|
410
|
|
|
411 p->upstream->peer.log = r->connection->log;
|
|
|
412 p->saved_ctx = r->connection->log->data;
|
|
|
413 p->saved_handler = r->connection->log->handler;
|
|
|
414 r->connection->log->data = ctx;
|
|
|
415 r->connection->log->handler = ngx_http_proxy_log_error;
|
|
|
416 p->action = "connecting to upstream";
|
|
|
417
|
|
|
418 if (!(output = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)))) {
|
|
|
419 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
420 return;
|
|
|
421 }
|
|
|
422
|
|
|
423 p->upstream->output_chain_ctx = output;
|
|
|
424
|
|
|
425 output->sendfile = r->sendfile;
|
|
|
426 output->pool = r->pool;
|
|
|
427 output->bufs.num = 1;
|
|
|
428 output->tag = (ngx_buf_tag_t) &ngx_http_proxy_module;
|
|
|
429 output->output_filter = (ngx_output_chain_filter_pt) ngx_chain_writer;
|
|
|
430
|
|
|
431 if (!(writer = ngx_palloc(r->pool, sizeof(ngx_chain_writer_ctx_t)))) {
|
|
|
432 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
433 return;
|
|
|
434 }
|
|
|
435
|
|
|
436 output->filter_ctx = writer;
|
|
|
437 writer->pool = r->pool;
|
|
|
438
|
|
|
439 #if 0
|
|
|
440 if (p->lcf->busy_lock && p->busy_lock == NULL) {
|
|
|
441 #else
|
|
|
442 if (p->lcf->busy_lock && !p->busy_locked) {
|
|
|
443 #endif
|
|
|
444 ngx_http_proxy_upstream_busy_lock(p);
|
|
|
445 } else {
|
|
|
446 ngx_http_proxy_connect(p);
|
|
|
447 }
|
|
|
448 }
|
|
|
449
|
|
|
450
|
|
|
451 static void ngx_http_proxy_reinit_upstream(ngx_http_proxy_ctx_t *p)
|
|
|
452 {
|
|
|
453 ngx_chain_t *cl;
|
|
|
454 ngx_output_chain_ctx_t *output;
|
|
|
455
|
|
|
456 /* reinit the request chain */
|
|
|
457
|
|
|
458 for (cl = p->request->request_body->bufs; cl; cl = cl->next) {
|
|
|
459 cl->buf->pos = cl->buf->start;
|
|
|
460 cl->buf->file_pos = 0;
|
|
|
461 }
|
|
|
462
|
|
|
463 /* reinit the ngx_output_chain() context */
|
|
|
464
|
|
|
465 output = p->upstream->output_chain_ctx;
|
|
|
466
|
|
|
467 output->buf = NULL;
|
|
|
468 output->in = NULL;
|
|
|
469 output->free = NULL;
|
|
|
470 output->busy = NULL;
|
|
|
471
|
|
|
472 /* reinit r->header_in buffer */
|
|
|
473
|
|
|
474 if (p->header_in) {
|
|
|
475 if (p->cache) {
|
|
|
476 p->header_in->pos = p->header_in->start + p->cache->ctx.header_size;
|
|
|
477 p->header_in->last = p->header_in->pos;
|
|
|
478
|
|
|
479 } else {
|
|
|
480 p->header_in->pos = p->header_in->start;
|
|
|
481 p->header_in->last = p->header_in->start;
|
|
|
482 }
|
|
|
483 }
|
|
|
484
|
|
|
485 /* add one more state */
|
|
|
486
|
|
|
487 if (!(p->state = ngx_push_array(&p->states))) {
|
|
|
488 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
489 return;
|
|
|
490 }
|
|
|
491
|
|
|
492 p->status = 0;
|
|
|
493 p->status_count = 0;
|
|
|
494 }
|
|
|
495
|
|
|
496
|
|
|
497 #if 0
|
|
|
498
|
|
|
499 void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p)
|
|
|
500 {
|
|
|
501 ngx_int_t rc;
|
|
|
502
|
|
|
503 rc = ngx_event_busy_lock(p->lcf->busy_lock, p->busy_lock);
|
|
|
504
|
|
|
505 if (rc == NGX_AGAIN) {
|
|
|
506 return;
|
|
|
507 }
|
|
|
508
|
|
|
509 if (rc == NGX_OK) {
|
|
|
510 ngx_http_proxy_connect(p);
|
|
|
511 return;
|
|
|
512 }
|
|
|
513
|
|
|
514 if (rc == NGX_ERROR) {
|
|
|
515 p->state->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
516 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
517 return;
|
|
|
518 }
|
|
|
519
|
|
|
520 /* rc == NGX_BUSY */
|
|
|
521
|
|
|
522 #if (NGX_HTTP_CACHE)
|
|
|
523
|
|
|
524 if (p->busy_lock->timer) {
|
|
|
525 ft_type = NGX_HTTP_PROXY_FT_MAX_WAITING;
|
|
|
526 } else {
|
|
|
527 ft_type = NGX_HTTP_PROXY_FT_BUSY_LOCK;
|
|
|
528 }
|
|
|
529
|
|
|
530 if (p->stale && (p->lcf->use_stale & ft_type)) {
|
|
|
531 ngx_http_proxy_finalize_request(p,
|
|
|
532 ngx_http_proxy_send_cached_response(p));
|
|
|
533 return;
|
|
|
534 }
|
|
|
535
|
|
|
536 #endif
|
|
|
537
|
|
|
538 p->state->status = NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
|
539 ngx_http_proxy_finalize_request(p, NGX_HTTP_SERVICE_UNAVAILABLE);
|
|
|
540 }
|
|
|
541
|
|
|
542 #endif
|
|
|
543
|
|
|
544
|
|
|
545 #if 1
|
|
|
546
|
|
|
547 void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p)
|
|
|
548 {
|
|
|
549 ngx_int_t rc;
|
|
|
550 #if (NGX_HTTP_CACHE)
|
|
|
551 ngx_int_t ft_type;
|
|
|
552 #endif
|
|
|
553
|
|
|
554 if (p->busy_lock.time == 0) {
|
|
|
555 p->busy_lock.event = p->request->connection->read;
|
|
|
556 p->busy_lock.event_handler = ngx_http_proxy_busy_lock_handler;
|
|
|
557 }
|
|
|
558
|
|
|
559 rc = ngx_http_busy_lock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
560
|
|
|
561 if (rc == NGX_AGAIN) {
|
|
|
562 return;
|
|
|
563 }
|
|
|
564
|
|
|
565 if (rc == NGX_OK) {
|
|
|
566 ngx_http_proxy_connect(p);
|
|
|
567 return;
|
|
|
568 }
|
|
|
569
|
|
|
570 ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
571
|
|
|
572 #if (NGX_HTTP_CACHE)
|
|
|
573
|
|
|
574 if (rc == NGX_DONE) {
|
|
|
575 ft_type = NGX_HTTP_PROXY_FT_BUSY_LOCK;
|
|
|
576
|
|
|
577 } else {
|
|
|
578 /* rc == NGX_ERROR */
|
|
|
579 ft_type = NGX_HTTP_PROXY_FT_MAX_WAITING;
|
|
|
580 }
|
|
|
581
|
|
|
582 if (p->stale && (p->lcf->use_stale & ft_type)) {
|
|
|
583 ngx_http_proxy_finalize_request(p,
|
|
|
584 ngx_http_proxy_send_cached_response(p));
|
|
|
585 return;
|
|
|
586 }
|
|
|
587
|
|
|
588 #endif
|
|
|
589
|
|
|
590 p->state->status = NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
|
591 ngx_http_proxy_finalize_request(p, NGX_HTTP_SERVICE_UNAVAILABLE);
|
|
|
592 }
|
|
|
593
|
|
|
594 #endif
|
|
|
595
|
|
|
596
|
|
|
597 static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p)
|
|
|
598 {
|
|
|
599 int rc;
|
|
|
600 ngx_connection_t *c;
|
|
|
601 ngx_http_request_t *r;
|
|
|
602 ngx_output_chain_ctx_t *output;
|
|
|
603 ngx_chain_writer_ctx_t *writer;
|
|
|
604
|
|
|
605 p->action = "connecting to upstream";
|
|
|
606
|
|
|
607 p->request->connection->single_connection = 0;
|
|
|
608
|
|
|
609 rc = ngx_event_connect_peer(&p->upstream->peer);
|
|
|
610
|
|
|
611 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, p->request->connection->log, 0,
|
|
|
612 "http proxy connect: %d", rc);
|
|
|
613
|
|
|
614 if (rc == NGX_ERROR) {
|
|
|
615 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
616 return;
|
|
|
617 }
|
|
|
618
|
|
|
619 p->state->peer =
|
|
|
620 &p->upstream->peer.peers->peers[p->upstream->peer.cur_peer].addr_port_text;
|
|
|
621
|
|
|
622 if (rc == NGX_CONNECT_ERROR) {
|
|
|
623 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR);
|
|
|
624 return;
|
|
|
625 }
|
|
|
626
|
|
|
627 r = p->request;
|
|
|
628 c = p->upstream->peer.connection;
|
|
|
629
|
|
|
630 c->data = p;
|
|
|
631 c->write->event_handler = ngx_http_proxy_send_request_handler;
|
|
|
632 c->read->event_handler = ngx_http_proxy_process_upstream_status_line;
|
|
|
633
|
|
|
634 c->pool = r->pool;
|
|
|
635 c->read->log = c->write->log = c->log = r->connection->log;
|
|
|
636
|
|
|
637 /* init or reinit the ngx_output_chain() and ngx_chain_writer() contexts */
|
|
|
638
|
|
|
639 output = p->upstream->output_chain_ctx;
|
|
|
640 writer = output->filter_ctx;
|
|
|
641 writer->out = NULL;
|
|
|
642 writer->last = &writer->out;
|
|
|
643 writer->connection = c;
|
|
|
644 writer->limit = OFF_T_MAX_VALUE;
|
|
|
645
|
|
|
646 if (p->upstream->peer.tries > 1 && p->request_sent) {
|
|
|
647 ngx_http_proxy_reinit_upstream(p);
|
|
|
648 }
|
|
|
649
|
|
|
650 if (r->request_body->buf) {
|
|
|
651 if (r->request_body->temp_file->file.fd != NGX_INVALID_FILE) {
|
|
|
652
|
|
|
653 if (!(output->free = ngx_alloc_chain_link(r->pool))) {
|
|
|
654 ngx_http_proxy_finalize_request(p,
|
|
|
655 NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
656 return;
|
|
|
657 }
|
|
|
658
|
|
|
659 output->free->buf = r->request_body->buf;
|
|
|
660 output->free->next = NULL;
|
|
|
661 output->allocated = 1;
|
|
|
662
|
|
|
663 r->request_body->buf->pos = r->request_body->buf->start;
|
|
|
664 r->request_body->buf->last = r->request_body->buf->start;
|
|
|
665 r->request_body->buf->tag = (ngx_buf_tag_t) &ngx_http_proxy_module;
|
|
|
666
|
|
|
667 } else {
|
|
|
668 r->request_body->buf->pos = r->request_body->buf->start;
|
|
|
669 }
|
|
|
670 }
|
|
|
671
|
|
|
672 p->request_sent = 0;
|
|
|
673
|
|
|
674 if (rc == NGX_AGAIN) {
|
|
|
675 ngx_add_timer(c->write, p->lcf->connect_timeout);
|
|
|
676 return;
|
|
|
677 }
|
|
|
678
|
|
|
679 /* rc == NGX_OK */
|
|
|
680
|
|
|
681 #if 1 /* test only, see below about "post aio operation" */
|
|
|
682
|
|
|
683 if (c->read->ready) {
|
|
|
684 /* post aio operation */
|
|
|
685 ngx_http_proxy_process_upstream_status_line(c->read);
|
|
|
686 return;
|
|
|
687 }
|
|
|
688
|
|
|
689 #endif
|
|
|
690
|
|
|
691 ngx_http_proxy_send_request(p);
|
|
|
692 }
|
|
|
693
|
|
|
694
|
|
|
695 static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p)
|
|
|
696 {
|
|
|
697 int rc;
|
|
|
698 ngx_connection_t *c;
|
|
|
699
|
|
|
700 c = p->upstream->peer.connection;
|
|
|
701
|
|
|
702 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
|
|
|
703 "http proxy send request");
|
|
|
704
|
|
|
705 #if (HAVE_KQUEUE)
|
|
|
706
|
|
|
707 if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT)
|
|
|
708 && !p->request_sent
|
|
|
709 && c->write->pending_eof)
|
|
|
710 {
|
|
|
711 ngx_log_error(NGX_LOG_ERR, c->log, c->write->kq_errno,
|
|
|
712 "connect() failed");
|
|
|
713
|
|
|
714 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR);
|
|
|
715 return;
|
|
|
716 }
|
|
|
717
|
|
|
718 #endif
|
|
|
719
|
|
|
720 p->action = "sending request to upstream";
|
|
|
721
|
|
|
722 rc = ngx_output_chain(p->upstream->output_chain_ctx,
|
|
|
723 p->request_sent ? NULL:
|
|
|
724 p->request->request_body->bufs);
|
|
|
725
|
|
|
726 if (rc == NGX_ERROR) {
|
|
|
727 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR);
|
|
|
728 return;
|
|
|
729 }
|
|
|
730
|
|
|
731 p->request_sent = 1;
|
|
|
732
|
|
|
733 if (c->write->timer_set) {
|
|
|
734 ngx_del_timer(c->write);
|
|
|
735 }
|
|
|
736
|
|
|
737 if (rc == NGX_AGAIN) {
|
|
|
738 ngx_add_timer(c->write, p->lcf->send_timeout);
|
|
|
739
|
|
|
740 c->write->available = /* STUB: lowat */ 0;
|
|
|
741 if (ngx_handle_write_event(c->write, NGX_LOWAT_EVENT) == NGX_ERROR) {
|
|
|
742 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
743 return;
|
|
|
744 }
|
|
|
745
|
|
|
746 return;
|
|
|
747 }
|
|
|
748
|
|
|
749 /* rc == NGX_OK */
|
|
|
750
|
|
|
751 if (c->tcp_nopush == NGX_TCP_NOPUSH_SET) {
|
|
|
752 if (ngx_tcp_push(c->fd) == NGX_ERROR) {
|
|
|
753 ngx_log_error(NGX_LOG_CRIT, c->log,
|
|
|
754 ngx_socket_errno,
|
|
|
755 ngx_tcp_push_n " failed");
|
|
|
756 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
757 return;
|
|
|
758 }
|
|
|
759
|
|
|
760 c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
|
|
|
761 return;
|
|
|
762 }
|
|
|
763
|
|
|
764 ngx_add_timer(c->read, p->lcf->read_timeout);
|
|
|
765
|
|
|
766 #if 0
|
|
|
767 if (c->read->ready) {
|
|
|
768
|
|
|
769 /* post aio operation */
|
|
|
770
|
|
|
771 /*
|
|
|
772 * although we can post aio operation just in the end
|
|
|
773 * of ngx_http_proxy_connect() CHECK IT !!!
|
|
|
774 * it's better to do here because we postpone header buffer allocation
|
|
|
775 */
|
|
|
776
|
|
|
777 ngx_http_proxy_process_upstream_status_line(c->read);
|
|
|
778 return;
|
|
|
779 }
|
|
|
780 #endif
|
|
|
781
|
|
|
782 c->write->event_handler = ngx_http_proxy_dummy_handler;
|
|
|
783
|
|
|
784 if (ngx_handle_level_write_event(c->write) == NGX_ERROR) {
|
|
|
785 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
786 return;
|
|
|
787 }
|
|
|
788 }
|
|
|
789
|
|
|
790
|
|
|
791 static void ngx_http_proxy_send_request_handler(ngx_event_t *wev)
|
|
|
792 {
|
|
|
793 ngx_connection_t *c;
|
|
|
794 ngx_http_proxy_ctx_t *p;
|
|
|
795
|
|
|
796 c = wev->data;
|
|
|
797 p = c->data;
|
|
|
798
|
|
|
799 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0,
|
|
|
800 "http proxy send request handler");
|
|
|
801
|
|
|
802 if (wev->timedout) {
|
|
|
803 p->action = "sending request to upstream";
|
|
|
804 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT);
|
|
|
805 return;
|
|
|
806 }
|
|
|
807
|
|
|
808 if (p->request->connection->write->eof
|
|
|
809 && (!p->cachable || !p->request_sent))
|
|
|
810 {
|
|
|
811 ngx_http_proxy_finalize_request(p, NGX_HTTP_CLIENT_CLOSED_REQUEST);
|
|
|
812 return;
|
|
|
813 }
|
|
|
814
|
|
|
815 ngx_http_proxy_send_request(p);
|
|
|
816 }
|
|
|
817
|
|
|
818
|
|
|
819 static void ngx_http_proxy_dummy_handler(ngx_event_t *wev)
|
|
|
820 {
|
|
|
821 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, "http proxy dummy handler");
|
|
|
822 }
|
|
|
823
|
|
|
824
|
|
|
825 static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev)
|
|
|
826 {
|
|
|
827 int rc;
|
|
|
828 ssize_t n;
|
|
|
829 ngx_connection_t *c;
|
|
|
830 ngx_http_proxy_ctx_t *p;
|
|
|
831
|
|
|
832 c = rev->data;
|
|
|
833 p = c->data;
|
|
|
834 p->action = "reading upstream status line";
|
|
|
835
|
|
|
836 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
|
|
|
837 "http proxy process status line");
|
|
|
838
|
|
|
839 if (rev->timedout) {
|
|
|
840 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT);
|
|
|
841 return;
|
|
|
842 }
|
|
|
843
|
|
|
844 if (p->header_in == NULL) {
|
|
|
845 p->header_in = ngx_create_temp_buf(p->request->pool,
|
|
|
846 p->lcf->header_buffer_size);
|
|
|
847 if (p->header_in == NULL) {
|
|
|
848 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
849 return;
|
|
|
850 }
|
|
|
851 p->header_in->tag = (ngx_buf_tag_t) &ngx_http_proxy_module;
|
|
|
852
|
|
|
853 if (p->cache) {
|
|
|
854 p->header_in->pos += p->cache->ctx.header_size;
|
|
|
855 p->header_in->last = p->header_in->pos;
|
|
|
856 }
|
|
|
857 }
|
|
|
858
|
|
|
859 n = ngx_http_proxy_read_upstream_header(p);
|
|
|
860
|
|
|
861 if (n == NGX_AGAIN) {
|
|
|
862 return;
|
|
|
863 }
|
|
|
864
|
|
|
865 if (n == 0) {
|
|
|
866 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
867 "upstream prematurely closed connection");
|
|
|
868 }
|
|
|
869
|
|
|
870 if (n == NGX_ERROR || n == 0) {
|
|
|
871 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR);
|
|
|
872 return;
|
|
|
873 }
|
|
|
874
|
|
|
875 p->valid_header_in = 0;
|
|
|
876
|
|
|
877 p->upstream->peer.cached = 0;
|
|
|
878
|
|
|
879 rc = ngx_http_proxy_parse_status_line(p);
|
|
|
880
|
|
|
881 if (rc == NGX_AGAIN) {
|
|
|
882 if (p->header_in->pos == p->header_in->last) {
|
|
|
883 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
884 "upstream sent too long status line");
|
|
|
885 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER);
|
|
|
886 }
|
|
|
887 return;
|
|
|
888 }
|
|
|
889
|
|
|
890 if (rc == NGX_HTTP_PROXY_PARSE_NO_HEADER) {
|
|
|
891 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
892 "upstream sent no valid HTTP/1.0 header");
|
|
|
893
|
|
|
894 if (p->accel) {
|
|
|
895 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER);
|
|
|
896
|
|
|
897 } else {
|
|
|
898 p->request->http_version = NGX_HTTP_VERSION_9;
|
|
|
899 p->upstream->status = NGX_HTTP_OK;
|
|
|
900 ngx_http_proxy_send_response(p);
|
|
|
901 }
|
|
|
902
|
|
|
903 return;
|
|
|
904 }
|
|
|
905
|
|
|
906 /* rc == NGX_OK */
|
|
|
907
|
|
|
908 p->upstream->status = p->status;
|
|
|
909 p->state->status = p->status;
|
|
|
910
|
|
|
911 if (p->status == NGX_HTTP_INTERNAL_SERVER_ERROR) {
|
|
|
912
|
|
|
913 if (p->upstream->peer.tries > 1
|
|
|
914 && (p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_500))
|
|
|
915 {
|
|
|
916 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_500);
|
|
|
917 return;
|
|
|
918 }
|
|
|
919
|
|
|
920 #if (NGX_HTTP_CACHE)
|
|
|
921
|
|
|
922 if (p->upstream->peer.tries == 0
|
|
|
923 && p->stale
|
|
|
924 && (p->lcf->use_stale & NGX_HTTP_PROXY_FT_HTTP_500))
|
|
|
925 {
|
|
|
926 ngx_http_proxy_finalize_request(p,
|
|
|
927 ngx_http_proxy_send_cached_response(p));
|
|
|
928
|
|
|
929 return;
|
|
|
930 }
|
|
|
931
|
|
|
932 #endif
|
|
|
933 }
|
|
|
934
|
|
|
935 if (p->status == NGX_HTTP_NOT_FOUND
|
|
|
936 && p->upstream->peer.tries > 1
|
|
|
937 && p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_404)
|
|
|
938 {
|
|
|
939 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_404);
|
|
|
940 return;
|
|
|
941 }
|
|
|
942
|
|
|
943 /* TODO: "proxy_error_page" */
|
|
|
944
|
|
|
945 p->upstream->status_line.len = p->status_end - p->status_start;
|
|
|
946 p->upstream->status_line.data = ngx_palloc(p->request->pool,
|
|
|
947 p->upstream->status_line.len + 1);
|
|
|
948 if (p->upstream->status_line.data == NULL) {
|
|
|
949 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
950 return;
|
|
|
951 }
|
|
|
952 ngx_cpystrn(p->upstream->status_line.data, p->status_start,
|
|
|
953 p->upstream->status_line.len + 1);
|
|
|
954
|
|
|
955 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, rev->log, 0,
|
|
|
956 "http proxy status %d \"%s\"",
|
|
|
957 p->upstream->status, p->upstream->status_line.data);
|
|
|
958
|
|
|
959
|
|
|
960 /* init or reinit the p->upstream->headers_in.headers table */
|
|
|
961
|
|
|
962 if (p->upstream->headers_in.headers.part.elts) {
|
|
|
963 p->upstream->headers_in.headers.part.nelts = 0;
|
|
|
964 p->upstream->headers_in.headers.part.next = NULL;
|
|
|
965 p->upstream->headers_in.headers.last =
|
|
|
966 &p->upstream->headers_in.headers.part;
|
|
|
967
|
|
|
968 ngx_memzero(&p->upstream->headers_in.date,
|
|
|
969 sizeof(ngx_http_proxy_headers_in_t) - sizeof(ngx_list_t));
|
|
|
970
|
|
|
971 } else {
|
|
|
972 if (ngx_list_init(&p->upstream->headers_in.headers, p->request->pool,
|
|
|
973 20, sizeof(ngx_table_elt_t)) == NGX_ERROR)
|
|
|
974 {
|
|
|
975 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
976 return;
|
|
|
977 }
|
|
|
978 }
|
|
|
979
|
|
|
980
|
|
|
981 c->read->event_handler = ngx_http_proxy_process_upstream_headers;
|
|
|
982 ngx_http_proxy_process_upstream_headers(rev);
|
|
|
983 }
|
|
|
984
|
|
|
985
|
|
|
986 static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev)
|
|
|
987 {
|
|
|
988 int i, rc;
|
|
|
989 ssize_t n;
|
|
|
990 ngx_table_elt_t *h;
|
|
|
991 ngx_connection_t *c;
|
|
|
992 ngx_http_request_t *r;
|
|
|
993 ngx_http_proxy_ctx_t *p;
|
|
|
994
|
|
|
995 c = rev->data;
|
|
|
996 p = c->data;
|
|
|
997 r = p->request;
|
|
|
998 p->action = "reading upstream headers";
|
|
|
999
|
|
|
1000 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
|
|
|
1001 "http proxy process header line");
|
|
|
1002
|
|
|
1003 if (rev->timedout) {
|
|
|
1004 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT);
|
|
|
1005 return;
|
|
|
1006 }
|
|
|
1007
|
|
|
1008 rc = NGX_AGAIN;
|
|
|
1009
|
|
|
1010 for ( ;; ) {
|
|
|
1011 if (rc == NGX_AGAIN) {
|
|
|
1012 n = ngx_http_proxy_read_upstream_header(p);
|
|
|
1013
|
|
|
1014 if (n == 0) {
|
|
|
1015 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
1016 "upstream prematurely closed connection");
|
|
|
1017 }
|
|
|
1018
|
|
|
1019 if (n == NGX_ERROR || n == 0) {
|
|
|
1020 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR);
|
|
|
1021 return;
|
|
|
1022 }
|
|
|
1023
|
|
|
1024 if (n == NGX_AGAIN) {
|
|
|
1025 return;
|
|
|
1026 }
|
|
|
1027 }
|
|
|
1028
|
|
|
1029 rc = ngx_http_parse_header_line(p->request, p->header_in);
|
|
|
1030
|
|
|
1031 if (rc == NGX_OK) {
|
|
|
1032
|
|
|
1033 /* a header line has been parsed successfully */
|
|
|
1034
|
|
|
1035 if (!(h = ngx_list_push(&p->upstream->headers_in.headers))) {
|
|
|
1036 ngx_http_proxy_finalize_request(p,
|
|
|
1037 NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
1038 return;
|
|
|
1039 }
|
|
|
1040
|
|
|
1041 h->key.len = r->header_name_end - r->header_name_start;
|
|
|
1042 h->value.len = r->header_end - r->header_start;
|
|
|
1043
|
|
|
1044 h->key.data = ngx_palloc(p->request->pool,
|
|
|
1045 h->key.len + 1 + h->value.len + 1);
|
|
|
1046 if (h->key.data == NULL) {
|
|
|
1047 ngx_http_proxy_finalize_request(p,
|
|
|
1048 NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
1049 return;
|
|
|
1050 }
|
|
|
1051
|
|
|
1052 h->value.data = h->key.data + h->key.len + 1;
|
|
|
1053 ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1);
|
|
|
1054 ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1);
|
|
|
1055
|
|
|
1056 for (i = 0; ngx_http_proxy_headers_in[i].name.len != 0; i++) {
|
|
|
1057 if (ngx_http_proxy_headers_in[i].name.len != h->key.len) {
|
|
|
1058 continue;
|
|
|
1059 }
|
|
|
1060
|
|
|
1061 if (ngx_strcasecmp(ngx_http_proxy_headers_in[i].name.data,
|
|
|
1062 h->key.data) == 0)
|
|
|
1063 {
|
|
|
1064 *((ngx_table_elt_t **) ((char *) &p->upstream->headers_in
|
|
|
1065 + ngx_http_proxy_headers_in[i].offset)) = h;
|
|
|
1066 break;
|
|
|
1067 }
|
|
|
1068 }
|
|
|
1069
|
|
|
1070 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
|
|
|
1071 "http proxy header: \"%s: %s\"",
|
|
|
1072 h->key.data, h->value.data);
|
|
|
1073
|
|
|
1074 continue;
|
|
|
1075
|
|
|
1076 } else if (rc == NGX_HTTP_PARSE_HEADER_DONE) {
|
|
|
1077
|
|
|
1078 /* a whole header has been parsed successfully */
|
|
|
1079
|
|
|
1080 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
|
|
|
1081 "http proxy header done");
|
|
|
1082
|
|
|
1083 /* TODO: hook to process the upstream header */
|
|
|
1084
|
|
|
1085 #if (NGX_HTTP_CACHE)
|
|
|
1086
|
|
|
1087 if (p->cachable) {
|
|
|
1088 p->cachable = ngx_http_proxy_is_cachable(p);
|
|
|
1089 }
|
|
|
1090
|
|
|
1091 #endif
|
|
|
1092
|
|
|
1093 ngx_http_proxy_send_response(p);
|
|
|
1094 return;
|
|
|
1095
|
|
|
1096 } else if (rc != NGX_AGAIN) {
|
|
|
1097
|
|
|
1098 /* there was error while a header line parsing */
|
|
|
1099
|
|
|
1100 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
1101 upstream_header_errors[rc - NGX_HTTP_PARSE_HEADER_ERROR]);
|
|
|
1102
|
|
|
1103 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER);
|
|
|
1104 return;
|
|
|
1105 }
|
|
|
1106
|
|
|
1107 /* rc == NGX_AGAIN: a header line parsing is still not complete */
|
|
|
1108
|
|
|
1109 if (p->header_in->last == p->header_in->end) {
|
|
|
1110 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
1111 "upstream sent too big header");
|
|
|
1112
|
|
|
1113 ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER);
|
|
|
1114 return;
|
|
|
1115 }
|
|
|
1116 }
|
|
|
1117 }
|
|
|
1118
|
|
|
1119
|
|
|
1120 static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *p)
|
|
|
1121 {
|
|
|
1122 ssize_t n;
|
|
|
1123 ngx_event_t *rev;
|
|
|
1124
|
|
|
1125 rev = p->upstream->peer.connection->read;
|
|
|
1126
|
|
|
1127 n = p->header_in->last - p->header_in->pos;
|
|
|
1128
|
|
|
1129 if (n > 0) {
|
|
|
1130 return n;
|
|
|
1131 }
|
|
|
1132
|
|
|
1133 n = ngx_recv(p->upstream->peer.connection, p->header_in->last,
|
|
|
1134 p->header_in->end - p->header_in->last);
|
|
|
1135
|
|
|
1136 if (n == NGX_AGAIN) {
|
|
|
1137 #if 0
|
|
|
1138 ngx_add_timer(rev, p->lcf->read_timeout);
|
|
|
1139 #endif
|
|
|
1140
|
|
|
1141 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
|
|
|
1142 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
1143 return NGX_ERROR;
|
|
|
1144 }
|
|
|
1145
|
|
|
1146 return NGX_AGAIN;
|
|
|
1147 }
|
|
|
1148
|
|
|
1149 if (n == 0) {
|
|
|
1150 ngx_log_error(NGX_LOG_ERR, rev->log, 0,
|
|
|
1151 "upstream closed prematurely connection");
|
|
|
1152 }
|
|
|
1153
|
|
|
1154 if (n == 0 || n == NGX_ERROR) {
|
|
|
1155 return NGX_ERROR;
|
|
|
1156 }
|
|
|
1157
|
|
|
1158 p->header_in->last += n;
|
|
|
1159
|
|
|
1160 return n;
|
|
|
1161 }
|
|
|
1162
|
|
|
1163
|
|
|
1164 static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p)
|
|
|
1165 {
|
|
|
1166 int rc;
|
|
|
1167 ngx_event_pipe_t *ep;
|
|
|
1168 ngx_http_request_t *r;
|
|
|
1169 ngx_http_cache_header_t *header;
|
|
|
1170 ngx_http_core_loc_conf_t *clcf;
|
|
|
1171
|
|
|
1172 r = p->request;
|
|
|
1173
|
|
|
1174 r->headers_out.status = p->upstream->status;
|
|
|
1175
|
|
|
1176 #if 0
|
|
|
1177 r->headers_out.content_length_n = -1;
|
|
|
1178 r->headers_out.content_length = NULL;
|
|
|
1179 #endif
|
|
|
1180
|
|
|
1181 /* copy an upstream header to r->headers_out */
|
|
|
1182
|
|
|
1183 if (ngx_http_proxy_copy_header(p, &p->upstream->headers_in) == NGX_ERROR) {
|
|
|
1184 ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
|
1185 return;
|
|
|
1186 }
|
|
|
1187
|
|
|
1188 /* TODO: preallocate event_pipe bufs, look "Content-Length" */
|
|
|
1189
|
|
|
1190 rc = ngx_http_send_header(r);
|
|
|
1191
|
|
|
1192 p->header_sent = 1;
|
|
|
1193
|
|
|
1194 if (p->cache && p->cache->ctx.file.fd != NGX_INVALID_FILE) {
|
|
|
1195 if (ngx_close_file(p->cache->ctx.file.fd) == NGX_FILE_ERROR) {
|
|
|
1196 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
|
|
|
1197 ngx_close_file_n " \"%s\" failed",
|
|
|
1198 p->cache->ctx.file.name.data);
|
|
|
1199 }
|
|
|
1200 }
|
|
|
1201
|
|
|
1202 if (p->cachable) {
|
|
|
1203 header = (ngx_http_cache_header_t *) p->header_in->start;
|
|
|
1204
|
|
|
1205 header->expires = p->cache->ctx.expires;
|
|
|
1206 header->last_modified = p->cache->ctx.last_modified;
|
|
|
1207 header->date = p->cache->ctx.date;
|
|
|
1208 header->length = r->headers_out.content_length_n;
|
|
|
1209 p->cache->ctx.length = r->headers_out.content_length_n;
|
|
|
1210
|
|
|
1211 header->key_len = p->cache->ctx.key.len;
|
|
|
1212 ngx_memcpy(&header->key, p->cache->ctx.key.data, header->key_len);
|
|
|
1213 header->key[header->key_len] = LF;
|
|
|
1214 }
|
|
|
1215
|
|
|
1216 ep = ngx_pcalloc(r->pool, sizeof(ngx_event_pipe_t));
|
|
|
1217 if (ep == NULL) {
|
|
|
1218 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1219 return;
|
|
|
1220 }
|
|
|
1221
|
|
|
1222 p->upstream->event_pipe = ep;
|
|
|
1223
|
|
|
1224 ep->input_filter = ngx_event_pipe_copy_input_filter;
|
|
|
1225 ep->output_filter = (ngx_event_pipe_output_filter_pt)
|
|
|
1226 ngx_http_output_filter;
|
|
|
1227 ep->output_ctx = r;
|
|
|
1228 ep->tag = (ngx_buf_tag_t) &ngx_http_proxy_module;
|
|
|
1229 ep->bufs = p->lcf->bufs;
|
|
|
1230 ep->busy_size = p->lcf->busy_buffers_size;
|
|
|
1231 ep->upstream = p->upstream->peer.connection;
|
|
|
1232 ep->downstream = r->connection;
|
|
|
1233 ep->pool = r->pool;
|
|
|
1234 ep->log = r->connection->log;
|
|
|
1235
|
|
|
1236 ep->cachable = p->cachable;
|
|
|
1237
|
|
|
1238 if (!(ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) {
|
|
|
1239 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1240 return;
|
|
|
1241 }
|
|
|
1242
|
|
|
1243 ep->temp_file->file.fd = NGX_INVALID_FILE;
|
|
|
1244 ep->temp_file->file.log = r->connection->log;
|
|
|
1245 ep->temp_file->path = p->lcf->temp_path;
|
|
|
1246 ep->temp_file->pool = r->pool;
|
|
|
1247
|
|
|
1248 if (p->cachable) {
|
|
|
1249 ep->temp_file->persistent = 1;
|
|
|
1250 } else {
|
|
|
1251 ep->temp_file->warn = "an upstream response is buffered "
|
|
|
1252 "to a temporary file";
|
|
|
1253 }
|
|
|
1254
|
|
|
1255 ep->max_temp_file_size = p->lcf->max_temp_file_size;
|
|
|
1256 ep->temp_file_write_size = p->lcf->temp_file_write_size;
|
|
|
1257
|
|
|
1258 if (!(ep->preread_bufs = ngx_alloc_chain_link(r->pool))) {
|
|
|
1259 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1260 return;
|
|
|
1261 }
|
|
|
1262 ep->preread_bufs->buf = p->header_in;
|
|
|
1263 ep->preread_bufs->next = NULL;
|
|
|
1264
|
|
|
1265 ep->preread_size = p->header_in->last - p->header_in->pos;
|
|
|
1266
|
|
|
1267 if (p->cachable) {
|
|
|
1268 ep->buf_to_file = ngx_calloc_buf(r->pool);
|
|
|
1269 if (ep->buf_to_file == NULL) {
|
|
|
1270 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1271 return;
|
|
|
1272 }
|
|
|
1273 ep->buf_to_file->pos = p->header_in->start;
|
|
|
1274 ep->buf_to_file->last = p->header_in->pos;
|
|
|
1275 ep->buf_to_file->temporary = 1;
|
|
|
1276 }
|
|
|
1277
|
|
|
1278 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
|
|
|
1279 /* the posted aio operation can currupt a shadow buffer */
|
|
|
1280 ep->single_buf = 1;
|
|
|
1281 }
|
|
|
1282
|
|
|
1283 /* TODO: ep->free_bufs = 0 if use ngx_create_chain_of_bufs() */
|
|
|
1284 ep->free_bufs = 1;
|
|
|
1285
|
|
|
1286 /*
|
|
|
1287 * event_pipe would do p->header_in->last += ep->preread_size
|
|
|
1288 * as though these bytes were read.
|
|
|
1289 */
|
|
|
1290 p->header_in->last = p->header_in->pos;
|
|
|
1291
|
|
|
1292 if (p->lcf->cyclic_temp_file) {
|
|
|
1293
|
|
|
1294 /*
|
|
|
1295 * we need to disable the use of sendfile() if we use cyclic temp file
|
|
|
1296 * because the writing a new data can interfere with sendfile()
|
|
|
1297 * that uses the same kernel file pages (at least on FreeBSD)
|
|
|
1298 */
|
|
|
1299
|
|
|
1300 ep->cyclic_temp_file = 1;
|
|
|
1301 r->sendfile = 0;
|
|
|
1302
|
|
|
1303 } else {
|
|
|
1304 ep->cyclic_temp_file = 0;
|
|
|
1305 r->sendfile = 1;
|
|
|
1306 }
|
|
|
1307
|
|
|
1308 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
|
|
|
1309
|
|
|
1310 ep->read_timeout = p->lcf->read_timeout;
|
|
|
1311 ep->send_timeout = clcf->send_timeout;
|
|
|
1312 ep->send_lowat = clcf->send_lowat;
|
|
|
1313
|
|
|
1314 p->upstream->peer.connection->read->event_handler =
|
|
|
1315 ngx_http_proxy_process_body;
|
|
|
1316 r->connection->write->event_handler = ngx_http_proxy_process_body;
|
|
|
1317
|
|
|
1318 ngx_http_proxy_process_body(p->upstream->peer.connection->read);
|
|
|
1319
|
|
|
1320 return;
|
|
|
1321 }
|
|
|
1322
|
|
|
1323
|
|
|
1324 static void ngx_http_proxy_process_body(ngx_event_t *ev)
|
|
|
1325 {
|
|
|
1326 ngx_connection_t *c;
|
|
|
1327 ngx_http_request_t *r;
|
|
|
1328 ngx_http_proxy_ctx_t *p;
|
|
|
1329 ngx_event_pipe_t *ep;
|
|
|
1330
|
|
|
1331 c = ev->data;
|
|
|
1332
|
|
|
1333 if (ev->write) {
|
|
|
1334 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
|
|
|
1335 "http proxy process downstream");
|
|
|
1336 r = c->data;
|
|
|
1337 p = ngx_http_get_module_ctx(r, ngx_http_proxy_module);
|
|
|
1338 p->action = "sending to client";
|
|
|
1339
|
|
|
1340 } else {
|
|
|
1341 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
|
|
|
1342 "http proxy process upstream");
|
|
|
1343 p = c->data;
|
|
|
1344 r = p->request;
|
|
|
1345 p->action = "reading upstream body";
|
|
|
1346 }
|
|
|
1347
|
|
|
1348 ep = p->upstream->event_pipe;
|
|
|
1349
|
|
|
1350 if (ev->timedout) {
|
|
|
1351 if (ev->write) {
|
|
|
1352 ep->downstream_error = 1;
|
|
|
1353 ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT,
|
|
|
1354 "client timed out");
|
|
|
1355
|
|
|
1356 } else {
|
|
|
1357 ep->upstream_error = 1;
|
|
|
1358 ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT,
|
|
|
1359 "upstream timed out");
|
|
|
1360 }
|
|
|
1361
|
|
|
1362 } else {
|
|
|
1363 if (ngx_event_pipe(ep, ev->write) == NGX_ABORT) {
|
|
|
1364 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1365 return;
|
|
|
1366 }
|
|
|
1367 }
|
|
|
1368
|
|
|
1369 if (p->upstream->peer.connection) {
|
|
|
1370
|
|
|
1371 #if (NGX_HTTP_FILE_CACHE)
|
|
|
1372
|
|
|
1373 if (ep->upstream_done && p->cachable) {
|
|
|
1374 if (ngx_http_proxy_update_cache(p) == NGX_ERROR) {
|
|
|
1375 ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
1376 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1377 return;
|
|
|
1378 }
|
|
|
1379
|
|
|
1380 } else if (ep->upstream_eof && p->cachable) {
|
|
|
1381
|
|
|
1382 /* TODO: check length & update cache */
|
|
|
1383
|
|
|
1384 if (ngx_http_proxy_update_cache(p) == NGX_ERROR) {
|
|
|
1385 ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
1386 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1387 return;
|
|
|
1388 }
|
|
|
1389 }
|
|
|
1390
|
|
|
1391 #endif
|
|
|
1392
|
|
|
1393 if (ep->upstream_done || ep->upstream_eof || ep->upstream_error) {
|
|
|
1394 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ev->log, 0,
|
|
|
1395 "http proxy upstream exit: " PTR_FMT, ep->out);
|
|
|
1396 ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
1397 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1398 return;
|
|
|
1399 }
|
|
|
1400 }
|
|
|
1401
|
|
|
1402 if (ep->downstream_error) {
|
|
|
1403 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
|
|
|
1404 "http proxy downstream error");
|
|
|
1405 if (!p->cachable && p->upstream->peer.connection) {
|
|
|
1406 ngx_http_proxy_finalize_request(p, 0);
|
|
|
1407 }
|
|
|
1408 }
|
|
|
1409 }
|
|
|
1410
|
|
|
1411
|
|
|
1412 static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type)
|
|
|
1413 {
|
|
|
1414 int status;
|
|
|
1415
|
|
|
1416 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, p->request->connection->log, 0,
|
|
|
1417 "http proxy next upstream: %d", ft_type);
|
|
|
1418
|
|
|
1419 ngx_http_busy_unlock(p->lcf->busy_lock, &p->busy_lock);
|
|
|
1420
|
|
|
1421 if (ft_type != NGX_HTTP_PROXY_FT_HTTP_404) {
|
|
|
1422 ngx_event_connect_peer_failed(&p->upstream->peer);
|
|
|
1423 }
|
|
|
1424
|
|
|
1425 if (ft_type == NGX_HTTP_PROXY_FT_TIMEOUT) {
|
|
|
1426 ngx_log_error(NGX_LOG_ERR, p->request->connection->log, NGX_ETIMEDOUT,
|
|
|
1427 "upstream timed out");
|
|
|
1428 }
|
|
|
1429
|
|
|
1430 if (p->upstream->peer.cached && ft_type == NGX_HTTP_PROXY_FT_ERROR) {
|
|
|
1431 status = 0;
|
|
|
1432
|
|
|
1433 } else {
|
|
|
1434 switch(ft_type) {
|
|
|
1435 case NGX_HTTP_PROXY_FT_TIMEOUT:
|
|
|
1436 status = NGX_HTTP_GATEWAY_TIME_OUT;
|
|
|
1437 break;
|
|
|
1438
|
|
|
1439 case NGX_HTTP_PROXY_FT_HTTP_500:
|
|
|
1440 status = NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
1441 break;
|
|
|
1442
|
|
|
1443 case NGX_HTTP_PROXY_FT_HTTP_404:
|
|
|
1444 status = NGX_HTTP_NOT_FOUND;
|
|
|
1445 break;
|
|
|
1446
|
|
|
1447 /*
|
|
|
1448 * NGX_HTTP_PROXY_FT_BUSY_LOCK and NGX_HTTP_PROXY_FT_MAX_WAITING
|
|
|
1449 * never reach here
|
|
|
1450 */
|
|
|
1451
|
|
|
1452 default:
|
|
|
1453 status = NGX_HTTP_BAD_GATEWAY;
|
|
|
1454 }
|
|
|
1455 }
|
|
|
1456
|
|
|
1457 if (p->upstream->peer.connection) {
|
|
|
1458 ngx_http_proxy_close_connection(p);
|
|
|
1459 }
|
|
|
1460
|
|
|
1461 if (p->request->connection->write->eof) {
|
|
|
1462 ngx_http_proxy_finalize_request(p, NGX_HTTP_CLIENT_CLOSED_REQUEST);
|
|
|
1463 return;
|
|
|
1464 }
|
|
|
1465
|
|
|
1466 if (status) {
|
|
|
1467 p->state->status = status;
|
|
|
1468
|
|
|
1469 if (p->upstream->peer.tries == 0 || !(p->lcf->next_upstream & ft_type))
|
|
|
1470 {
|
|
|
1471
|
|
|
1472 #if (NGX_HTTP_CACHE)
|
|
|
1473
|
|
|
1474 if (p->stale && (p->lcf->use_stale & ft_type)) {
|
|
|
1475 ngx_http_proxy_finalize_request(p,
|
|
|
1476 ngx_http_proxy_send_cached_response(p));
|
|
|
1477 return;
|
|
|
1478 }
|
|
|
1479
|
|
|
1480 #endif
|
|
|
1481
|
|
|
1482 ngx_http_proxy_finalize_request(p, status);
|
|
|
1483 return;
|
|
|
1484 }
|
|
|
1485 }
|
|
|
1486
|
|
|
1487 if (p->lcf->busy_lock && !p->busy_locked) {
|
|
|
1488 ngx_http_proxy_upstream_busy_lock(p);
|
|
|
1489 } else {
|
|
|
1490 ngx_http_proxy_connect(p);
|
|
|
1491 }
|
|
|
1492 }
|
