Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 5263:05ba5bce31e0
Core: extended ngx_sock_ntop() with socklen parameter.
On Linux, sockaddr length is required to process unix socket addresses properly
due to unnamed sockets (which don't have sun_path set at all) and abstract
namespace sockets.
| author | Vladimir Homutov <vl@nginx.com> |
|---|---|
| date | Thu, 11 Jul 2013 16:07:25 +0400 |
| parents | f7fe817c92a2 |
| children | 3a72b1805c52 |
| 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, addr->socklen, text, |
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234 NGX_SOCKADDR_STRLEN, 0); |
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235 if (len == 0) { |
| 3274 | 236 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
| 237 } | |
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238 |
| 3274 | 239 p = ngx_pnalloc(c->pool, len); |
| 240 if (p == NULL) { | |
| 241 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| 242 } | |
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243 |
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244 ngx_memcpy(p, text, len); |
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245 |
| 3274 | 246 cln->handler = ngx_http_realip_cleanup; |
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247 |
| 3274 | 248 ctx->connection = c; |
| 249 ctx->sockaddr = c->sockaddr; | |
| 250 ctx->socklen = c->socklen; | |
| 251 ctx->addr_text = c->addr_text; | |
| 573 | 252 |
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253 c->sockaddr = addr->sockaddr; |
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254 c->socklen = addr->socklen; |
| 3274 | 255 c->addr_text.len = len; |
| 256 c->addr_text.data = p; | |
| 573 | 257 |
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258 return NGX_DECLINED; |
| 573 | 259 } |
| 260 | |
| 261 | |
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262 static void |
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263 ngx_http_realip_cleanup(void *data) |
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264 { |
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265 ngx_http_realip_ctx_t *ctx = data; |
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266 |
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267 ngx_connection_t *c; |
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268 |
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269 c = ctx->connection; |
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270 |
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271 c->sockaddr = ctx->sockaddr; |
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272 c->socklen = ctx->socklen; |
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273 c->addr_text = ctx->addr_text; |
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274 } |
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275 |
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276 |
| 573 | 277 static char * |
| 278 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 279 { | |
| 280 ngx_http_realip_loc_conf_t *rlcf = conf; | |
| 281 | |
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282 ngx_int_t rc; |
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283 ngx_str_t *value; |
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284 ngx_cidr_t *cidr; |
| 573 | 285 |
| 3274 | 286 value = cf->args->elts; |
| 287 | |
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288 if (rlcf->from == NULL) { |
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289 rlcf->from = ngx_array_create(cf->pool, 2, |
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290 sizeof(ngx_cidr_t)); |
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291 if (rlcf->from == NULL) { |
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292 return NGX_CONF_ERROR; |
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293 } |
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294 } |
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295 |
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296 cidr = ngx_array_push(rlcf->from); |
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297 if (cidr == NULL) { |
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298 return NGX_CONF_ERROR; |
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299 } |
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300 |
| 3274 | 301 #if (NGX_HAVE_UNIX_DOMAIN) |
| 302 | |
| 303 if (ngx_strcmp(value[1].data, "unix:") == 0) { | |
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304 cidr->family = AF_UNIX; |
| 3274 | 305 return NGX_CONF_OK; |
| 306 } | |
| 307 | |
| 308 #endif | |
| 309 | |
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310 rc = ngx_ptocidr(&value[1], cidr); |
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311 |
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312 if (rc == NGX_ERROR) { |
| 573 | 313 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
| 314 &value[1]); | |
| 315 return NGX_CONF_ERROR; | |
| 316 } | |
| 317 | |
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318 if (rc == NGX_DONE) { |
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319 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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320 "low address bits of %V are meaningless", &value[1]); |
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321 } |
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322 |
| 573 | 323 return NGX_CONF_OK; |
| 324 } | |
| 325 | |
| 326 | |
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327 static char * |
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328 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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329 { |
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330 ngx_http_realip_loc_conf_t *rlcf = conf; |
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331 |
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332 ngx_str_t *value; |
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333 |
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334 value = cf->args->elts; |
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335 |
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336 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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337 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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338 return NGX_CONF_OK; |
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339 } |
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340 |
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341 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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342 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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343 return NGX_CONF_OK; |
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344 } |
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345 |
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346 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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347 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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348 rlcf->header = value[1]; |
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349 |
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350 return NGX_CONF_OK; |
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351 } |
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352 |
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353 |
| 573 | 354 static void * |
| 355 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
| 356 { | |
| 357 ngx_http_realip_loc_conf_t *conf; | |
| 358 | |
| 359 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
| 360 if (conf == NULL) { | |
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361 return NULL; |
| 573 | 362 } |
| 363 | |
| 364 /* | |
| 365 * set by ngx_pcalloc(): | |
| 366 * | |
| 367 * conf->from = NULL; | |
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368 * conf->hash = 0; |
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369 * conf->header = { 0, NULL }; |
| 573 | 370 */ |
| 371 | |
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372 conf->type = NGX_CONF_UNSET_UINT; |
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373 conf->recursive = NGX_CONF_UNSET; |
| 573 | 374 |
| 375 return conf; | |
| 376 } | |
| 377 | |
| 378 | |
| 379 static char * | |
| 380 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 381 { | |
| 382 ngx_http_realip_loc_conf_t *prev = parent; | |
| 383 ngx_http_realip_loc_conf_t *conf = child; | |
| 384 | |
| 385 if (conf->from == NULL) { | |
| 386 conf->from = prev->from; | |
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387 } |
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388 |
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389 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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390 ngx_conf_merge_value(conf->recursive, prev->recursive, 0); |
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391 |
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392 if (conf->header.len == 0) { |
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393 conf->hash = prev->hash; |
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394 conf->header = prev->header; |
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395 } |
| 573 | 396 |
| 397 return NGX_CONF_OK; | |
| 398 } | |
| 399 | |
| 400 | |
| 401 static ngx_int_t | |
| 681 | 402 ngx_http_realip_init(ngx_conf_t *cf) |
| 573 | 403 { |
| 404 ngx_http_handler_pt *h; | |
| 405 ngx_http_core_main_conf_t *cmcf; | |
| 406 | |
| 681 | 407 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
| 573 | 408 |
| 409 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
| 410 if (h == NULL) { | |
| 411 return NGX_ERROR; | |
| 412 } | |
| 413 | |
| 414 *h = ngx_http_realip_handler; | |
| 415 | |
| 581 | 416 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
| 573 | 417 if (h == NULL) { |
| 418 return NGX_ERROR; | |
| 419 } | |
| 420 | |
| 421 *h = ngx_http_realip_handler; | |
| 422 | |
| 423 return NGX_OK; | |
| 424 } |