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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_http.h>
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10 #include <ngx_http_proxy_handler.h>
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11
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12
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13 static int ngx_http_proxy_rewrite_location_header(ngx_http_proxy_ctx_t *p,
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14 ngx_table_elt_t *loc);
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15
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16 int ngx_http_proxy_copy_header(ngx_http_proxy_ctx_t *p,
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17 ngx_http_proxy_headers_in_t *headers_in)
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18 {
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19 ngx_uint_t i;
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20 ngx_list_part_t *part;
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21 ngx_table_elt_t *ho, *h;
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22 ngx_http_request_t *r;
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23
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24 r = p->request;
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25
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26 part = &headers_in->headers.part;
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27 h = part->elts;
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28
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29 #if 0
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30 h = headers_in->headers.elts;
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31 for (i = 0; i < headers_in->headers.nelts; i++) {
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32 #endif
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33
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34 for (i = 0 ; /* void */; i++) {
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35
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36 if (i >= part->nelts) {
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37 if (part->next == NULL) {
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38 break;
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39 }
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40
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41 part = part->next;
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42 h = part->elts;
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43 i = 0;
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44 }
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45
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46 /* ignore some headers */
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47
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48 if (&h[i] == headers_in->connection) {
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49 continue;
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50 }
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51
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52 if (&h[i] == headers_in->x_pad) {
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53 continue;
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54 }
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55
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56 if (p->accel) {
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57 if (&h[i] == headers_in->date
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58 || &h[i] == headers_in->accept_ranges) {
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59 continue;
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60 }
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61
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62 if (&h[i] == headers_in->x_accel_expires
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63 && !p->lcf->pass_x_accel_expires)
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64 {
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65 continue;
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66 }
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67
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68 if (&h[i] == headers_in->server && !p->lcf->pass_server) {
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69 continue;
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70 }
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71
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72 if (&h[i] == headers_in->location) {
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73 if (ngx_http_proxy_rewrite_location_header(p, &h[i])
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74 == NGX_ERROR)
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75 {
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76 return NGX_ERROR;
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77 }
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78
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79 continue;
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80 }
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81 }
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82
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83
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84 /* "Content-Type" is handled specially */
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85
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86 if (&h[i] == headers_in->content_type) {
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87 r->headers_out.content_type = &h[i];
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88 r->headers_out.content_type->key.len = 0;
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89 continue;
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90 }
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91
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92
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93 /* copy some header pointers and set up r->headers_out */
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94
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95 if (!(ho = ngx_list_push(&r->headers_out.headers))) {
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96 return NGX_ERROR;
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97 }
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98
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99 *ho = h[i];
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100
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101 if (&h[i] == headers_in->expires) {
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102 r->headers_out.expires = ho;
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103 continue;
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104 }
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105
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106 if (&h[i] == headers_in->cache_control) {
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107 r->headers_out.cache_control = ho;
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108 continue;
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109 }
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110
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111 if (&h[i] == headers_in->etag) {
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112 r->headers_out.etag = ho;
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113 continue;
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114 }
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115
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116 if (&h[i] == headers_in->last_modified) {
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117 r->headers_out.last_modified = ho;
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118 /* TODO: update r->headers_out.last_modified_time */
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119 continue;
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120 }
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121
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122 /*
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123 * ngx_http_header_filter() passes the following headers as is
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124 * and does not handle them specially if they are set:
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125 * r->headers_out.server,
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126 * r->headers_out.date,
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127 * r->headers_out.content_length
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128 */
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129
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130 if (&h[i] == headers_in->server) {
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131 r->headers_out.server = ho;
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132 continue;
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133 }
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134
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135 if (&h[i] == headers_in->date) {
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136 r->headers_out.date = ho;
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137 continue;
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138 }
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139
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140 if (&h[i] == headers_in->content_length) {
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141 r->headers_out.content_length = ho;
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142 r->headers_out.content_length_n = ngx_atoi(ho->value.data,
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143 ho->value.len);
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144 continue;
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145 }
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146 }
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147
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148 return NGX_OK;
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149 }
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150
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151
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152 static int ngx_http_proxy_rewrite_location_header(ngx_http_proxy_ctx_t *p,
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153 ngx_table_elt_t *loc)
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154 {
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155 u_char *last;
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156 ngx_table_elt_t *location;
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157 ngx_http_request_t *r;
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158 ngx_http_proxy_upstream_conf_t *uc;
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159
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160 r = p->request;
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161 uc = p->lcf->upstream;
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162
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163 if (!(location = ngx_list_push(&r->headers_out.headers))) {
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164 return NGX_ERROR;
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165 }
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166
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167 if (uc->url.len > loc->value.len
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168 || ngx_rstrncmp(loc->value.data, uc->url.data, uc->url.len) != 0)
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169 {
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2
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170
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171 /*
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172 * we do not set r->headers_out.location here to avoid the handling
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173 * the local redirects without a host name by ngx_http_header_filter()
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174 */
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175
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0
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176 *location = *loc;
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177 return NGX_OK;
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178 }
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179
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180 /* TODO: proxy_reverse */
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181
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2
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182 r->headers_out.location = location;
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183
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184 location->key.len = 0;
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185 location->key.data = NULL;
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186
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0
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187 location->value.len = uc->location->len
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188 + (loc->value.len - uc->url.len) + 1;
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189 if (!(location->value.data = ngx_palloc(r->pool, location->value.len))) {
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190 return NGX_ERROR;
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191 }
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192
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193 last = ngx_cpymem(location->value.data,
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194 uc->location->data, uc->location->len);
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195
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196 ngx_cpystrn(last, loc->value.data + uc->url.len,
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197 loc->value.len - uc->url.len + 1);
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198
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199 return NGX_OK;
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200 }
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