Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 5204:a64c8a5da336
PCRE: retain input pattern for all regular expressions.
Previously, input pattern was kept only for regular expressions
with named captures, which resulted in error log entries without
input pattern for PCRE errors that occured while processing
regular expressions without them.
Signed-off-by: Piotr Sikora <piotr@cloudflare.com>
| author | Piotr Sikora <piotr@cloudflare.com> |
|---|---|
| date | Thu, 02 May 2013 03:26:36 -0700 |
| parents | f7fe817c92a2 |
| children | 05ba5bce31e0 |
| rev | line source |
|---|---|
| 573 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 573 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
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13 #define NGX_HTTP_REALIP_XREALIP 0 |
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14 #define NGX_HTTP_REALIP_XFWD 1 |
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15 #define NGX_HTTP_REALIP_HEADER 2 |
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16 |
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17 |
| 573 | 18 typedef struct { |
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19 ngx_array_t *from; /* array of ngx_cidr_t */ |
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20 ngx_uint_t type; |
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21 ngx_uint_t hash; |
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22 ngx_str_t header; |
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23 ngx_flag_t recursive; |
| 573 | 24 } ngx_http_realip_loc_conf_t; |
| 25 | |
| 26 | |
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27 typedef struct { |
| 3274 | 28 ngx_connection_t *connection; |
| 29 struct sockaddr *sockaddr; | |
| 30 socklen_t socklen; | |
| 31 ngx_str_t addr_text; | |
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32 } ngx_http_realip_ctx_t; |
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33 |
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34 |
| 573 | 35 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
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36 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, |
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37 ngx_addr_t *addr); |
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38 static void ngx_http_realip_cleanup(void *data); |
| 573 | 39 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
| 40 void *conf); | |
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41 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
| 573 | 42 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); |
| 43 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
| 44 void *parent, void *child); | |
| 681 | 45 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
| 573 | 46 |
| 47 | |
| 48 static ngx_command_t ngx_http_realip_commands[] = { | |
| 49 | |
| 50 { ngx_string("set_real_ip_from"), | |
| 51 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 52 ngx_http_realip_from, | |
| 53 NGX_HTTP_LOC_CONF_OFFSET, | |
| 54 0, | |
| 55 NULL }, | |
| 56 | |
| 57 { ngx_string("real_ip_header"), | |
| 58 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
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59 ngx_http_realip, |
| 573 | 60 NGX_HTTP_LOC_CONF_OFFSET, |
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61 0, |
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62 NULL }, |
| 573 | 63 |
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64 { ngx_string("real_ip_recursive"), |
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65 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, |
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66 ngx_conf_set_flag_slot, |
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67 NGX_HTTP_LOC_CONF_OFFSET, |
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68 offsetof(ngx_http_realip_loc_conf_t, recursive), |
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69 NULL }, |
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70 |
| 573 | 71 ngx_null_command |
| 72 }; | |
| 73 | |
| 74 | |
| 75 | |
| 667 | 76 static ngx_http_module_t ngx_http_realip_module_ctx = { |
| 573 | 77 NULL, /* preconfiguration */ |
| 681 | 78 ngx_http_realip_init, /* postconfiguration */ |
| 573 | 79 |
| 80 NULL, /* create main configuration */ | |
| 81 NULL, /* init main configuration */ | |
| 82 | |
| 83 NULL, /* create server configuration */ | |
| 84 NULL, /* merge server configuration */ | |
| 85 | |
| 86 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
| 87 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
| 88 }; | |
| 89 | |
| 90 | |
| 91 ngx_module_t ngx_http_realip_module = { | |
| 92 NGX_MODULE_V1, | |
| 93 &ngx_http_realip_module_ctx, /* module context */ | |
| 94 ngx_http_realip_commands, /* module directives */ | |
| 95 NGX_HTTP_MODULE, /* module type */ | |
| 96 NULL, /* init master */ | |
| 681 | 97 NULL, /* init module */ |
| 573 | 98 NULL, /* init process */ |
| 99 NULL, /* init thread */ | |
| 100 NULL, /* exit thread */ | |
| 101 NULL, /* exit process */ | |
| 102 NULL, /* exit master */ | |
| 103 NGX_MODULE_V1_PADDING | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 static ngx_int_t | |
| 108 ngx_http_realip_handler(ngx_http_request_t *r) | |
| 109 { | |
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110 u_char *p; |
| 573 | 111 size_t len; |
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112 ngx_str_t *value; |
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113 ngx_uint_t i, hash; |
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114 ngx_addr_t addr; |
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115 ngx_array_t *xfwd; |
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116 ngx_list_part_t *part; |
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117 ngx_table_elt_t *header; |
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118 ngx_connection_t *c; |
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119 ngx_http_realip_ctx_t *ctx; |
| 573 | 120 ngx_http_realip_loc_conf_t *rlcf; |
| 121 | |
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122 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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123 |
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124 if (ctx) { |
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125 return NGX_DECLINED; |
| 573 | 126 } |
| 127 | |
| 128 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); | |
| 129 | |
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130 if (rlcf->from == NULL) { |
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131 return NGX_DECLINED; |
| 573 | 132 } |
| 133 | |
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134 switch (rlcf->type) { |
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135 |
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136 case NGX_HTTP_REALIP_XREALIP: |
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137 |
| 573 | 138 if (r->headers_in.x_real_ip == NULL) { |
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139 return NGX_DECLINED; |
| 573 | 140 } |
| 141 | |
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142 value = &r->headers_in.x_real_ip->value; |
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143 xfwd = NULL; |
| 573 | 144 |
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145 break; |
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146 |
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147 case NGX_HTTP_REALIP_XFWD: |
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148 |
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149 xfwd = &r->headers_in.x_forwarded_for; |
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150 |
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151 if (xfwd->elts == NULL) { |
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152 return NGX_DECLINED; |
| 573 | 153 } |
| 154 | |
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155 value = NULL; |
| 573 | 156 |
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157 break; |
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158 |
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159 default: /* NGX_HTTP_REALIP_HEADER */ |
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160 |
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161 part = &r->headers_in.headers.part; |
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162 header = part->elts; |
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163 |
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164 hash = rlcf->hash; |
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165 len = rlcf->header.len; |
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166 p = rlcf->header.data; |
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167 |
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168 for (i = 0; /* void */ ; i++) { |
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169 |
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170 if (i >= part->nelts) { |
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171 if (part->next == NULL) { |
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172 break; |
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173 } |
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174 |
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175 part = part->next; |
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176 header = part->elts; |
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177 i = 0; |
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178 } |
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179 |
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180 if (hash == header[i].hash |
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181 && len == header[i].key.len |
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182 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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183 { |
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184 value = &header[i].value; |
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185 xfwd = NULL; |
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186 |
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187 goto found; |
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188 } |
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189 } |
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190 |
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191 return NGX_DECLINED; |
| 573 | 192 } |
| 193 | |
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194 found: |
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195 |
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196 c = r->connection; |
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197 |
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198 addr.sockaddr = c->sockaddr; |
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199 addr.socklen = c->socklen; |
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200 /* addr.name = c->addr_text; */ |
| 3274 | 201 |
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202 if (ngx_http_get_forwarded_addr(r, &addr, xfwd, value, rlcf->from, |
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203 rlcf->recursive) |
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204 != NGX_DECLINED) |
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205 { |
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206 return ngx_http_realip_set_addr(r, &addr); |
| 3274 | 207 } |
| 208 | |
| 209 return NGX_DECLINED; | |
| 210 } | |
| 211 | |
| 573 | 212 |
| 3274 | 213 static ngx_int_t |
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214 ngx_http_realip_set_addr(ngx_http_request_t *r, ngx_addr_t *addr) |
| 3274 | 215 { |
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216 size_t len; |
| 3274 | 217 u_char *p; |
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218 u_char text[NGX_SOCKADDR_STRLEN]; |
| 3274 | 219 ngx_connection_t *c; |
| 220 ngx_pool_cleanup_t *cln; | |
| 221 ngx_http_realip_ctx_t *ctx; | |
| 573 | 222 |
| 3274 | 223 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
| 224 if (cln == NULL) { | |
| 225 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| 226 } | |
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227 |
| 3274 | 228 ctx = cln->data; |
| 229 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); | |
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230 |
| 3274 | 231 c = r->connection; |
| 232 | |
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233 len = ngx_sock_ntop(addr->sockaddr, text, NGX_SOCKADDR_STRLEN, 0); |
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234 if (len == 0) { |
| 3274 | 235 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
| 236 } | |
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237 |
| 3274 | 238 p = ngx_pnalloc(c->pool, len); |
| 239 if (p == NULL) { | |
| 240 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| 241 } | |
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242 |
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243 ngx_memcpy(p, text, len); |
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244 |
| 3274 | 245 cln->handler = ngx_http_realip_cleanup; |
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246 |
| 3274 | 247 ctx->connection = c; |
| 248 ctx->sockaddr = c->sockaddr; | |
| 249 ctx->socklen = c->socklen; | |
| 250 ctx->addr_text = c->addr_text; | |
| 573 | 251 |
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252 c->sockaddr = addr->sockaddr; |
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253 c->socklen = addr->socklen; |
| 3274 | 254 c->addr_text.len = len; |
| 255 c->addr_text.data = p; | |
| 573 | 256 |
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257 return NGX_DECLINED; |
| 573 | 258 } |
| 259 | |
| 260 | |
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261 static void |
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262 ngx_http_realip_cleanup(void *data) |
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263 { |
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264 ngx_http_realip_ctx_t *ctx = data; |
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265 |
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266 ngx_connection_t *c; |
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267 |
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268 c = ctx->connection; |
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269 |
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270 c->sockaddr = ctx->sockaddr; |
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271 c->socklen = ctx->socklen; |
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272 c->addr_text = ctx->addr_text; |
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273 } |
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274 |
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275 |
| 573 | 276 static char * |
| 277 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 278 { | |
| 279 ngx_http_realip_loc_conf_t *rlcf = conf; | |
| 280 | |
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281 ngx_int_t rc; |
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282 ngx_str_t *value; |
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283 ngx_cidr_t *cidr; |
| 573 | 284 |
| 3274 | 285 value = cf->args->elts; |
| 286 | |
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287 if (rlcf->from == NULL) { |
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288 rlcf->from = ngx_array_create(cf->pool, 2, |
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289 sizeof(ngx_cidr_t)); |
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290 if (rlcf->from == NULL) { |
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291 return NGX_CONF_ERROR; |
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292 } |
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293 } |
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294 |
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295 cidr = ngx_array_push(rlcf->from); |
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296 if (cidr == NULL) { |
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297 return NGX_CONF_ERROR; |
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298 } |
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299 |
| 3274 | 300 #if (NGX_HAVE_UNIX_DOMAIN) |
| 301 | |
| 302 if (ngx_strcmp(value[1].data, "unix:") == 0) { | |
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303 cidr->family = AF_UNIX; |
| 3274 | 304 return NGX_CONF_OK; |
| 305 } | |
| 306 | |
| 307 #endif | |
| 308 | |
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309 rc = ngx_ptocidr(&value[1], cidr); |
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310 |
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311 if (rc == NGX_ERROR) { |
| 573 | 312 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
| 313 &value[1]); | |
| 314 return NGX_CONF_ERROR; | |
| 315 } | |
| 316 | |
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317 if (rc == NGX_DONE) { |
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318 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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319 "low address bits of %V are meaningless", &value[1]); |
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320 } |
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321 |
| 573 | 322 return NGX_CONF_OK; |
| 323 } | |
| 324 | |
| 325 | |
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326 static char * |
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327 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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328 { |
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329 ngx_http_realip_loc_conf_t *rlcf = conf; |
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330 |
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331 ngx_str_t *value; |
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332 |
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333 value = cf->args->elts; |
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334 |
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335 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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336 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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337 return NGX_CONF_OK; |
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338 } |
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339 |
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340 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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341 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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342 return NGX_CONF_OK; |
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343 } |
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344 |
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345 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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346 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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347 rlcf->header = value[1]; |
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348 |
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349 return NGX_CONF_OK; |
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350 } |
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351 |
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352 |
| 573 | 353 static void * |
| 354 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
| 355 { | |
| 356 ngx_http_realip_loc_conf_t *conf; | |
| 357 | |
| 358 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
| 359 if (conf == NULL) { | |
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360 return NULL; |
| 573 | 361 } |
| 362 | |
| 363 /* | |
| 364 * set by ngx_pcalloc(): | |
| 365 * | |
| 366 * conf->from = NULL; | |
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367 * conf->hash = 0; |
|
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368 * conf->header = { 0, NULL }; |
| 573 | 369 */ |
| 370 | |
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371 conf->type = NGX_CONF_UNSET_UINT; |
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372 conf->recursive = NGX_CONF_UNSET; |
| 573 | 373 |
| 374 return conf; | |
| 375 } | |
| 376 | |
| 377 | |
| 378 static char * | |
| 379 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 380 { | |
| 381 ngx_http_realip_loc_conf_t *prev = parent; | |
| 382 ngx_http_realip_loc_conf_t *conf = child; | |
| 383 | |
| 384 if (conf->from == NULL) { | |
| 385 conf->from = prev->from; | |
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386 } |
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387 |
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388 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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389 ngx_conf_merge_value(conf->recursive, prev->recursive, 0); |
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390 |
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391 if (conf->header.len == 0) { |
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392 conf->hash = prev->hash; |
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393 conf->header = prev->header; |
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394 } |
| 573 | 395 |
| 396 return NGX_CONF_OK; | |
| 397 } | |
| 398 | |
| 399 | |
| 400 static ngx_int_t | |
| 681 | 401 ngx_http_realip_init(ngx_conf_t *cf) |
| 573 | 402 { |
| 403 ngx_http_handler_pt *h; | |
| 404 ngx_http_core_main_conf_t *cmcf; | |
| 405 | |
| 681 | 406 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
| 573 | 407 |
| 408 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
| 409 if (h == NULL) { | |
| 410 return NGX_ERROR; | |
| 411 } | |
| 412 | |
| 413 *h = ngx_http_realip_handler; | |
| 414 | |
| 581 | 415 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
| 573 | 416 if (h == NULL) { |
| 417 return NGX_ERROR; | |
| 418 } | |
| 419 | |
| 420 *h = ngx_http_realip_handler; | |
| 421 | |
| 422 return NGX_OK; | |
| 423 } |