122
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_http.h>
|
|
10
|
|
11
|
|
12 /* AF_INET only */
|
|
13
|
|
14 typedef struct {
|
396
|
15 in_addr_t mask;
|
|
16 in_addr_t addr;
|
122
|
17 } ngx_http_realip_from_t;
|
|
18
|
|
19
|
|
20 typedef struct {
|
396
|
21 ngx_array_t *from; /* array of ngx_http_realip_from_t */
|
|
22 ngx_uint_t xfwd;
|
122
|
23 } ngx_http_realip_loc_conf_t;
|
|
24
|
|
25
|
396
|
26 typedef struct {
|
|
27 ngx_connection_t *connection;
|
|
28 in_addr_t addr;
|
|
29 ngx_str_t addr_text;
|
|
30 } ngx_http_realip_ctx_t;
|
|
31
|
|
32
|
122
|
33 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
|
396
|
34 static void ngx_http_realip_cleanup(void *data);
|
122
|
35 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
36 void *conf);
|
|
37 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
|
|
38 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
|
|
39 void *parent, void *child);
|
230
|
40 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
|
122
|
41
|
|
42
|
|
43 static ngx_conf_enum_t ngx_http_realip_header[] = {
|
|
44 { ngx_string("X-Forwarded-For"), 1 },
|
|
45 { ngx_string("X-Real-IP"), 0 },
|
|
46 { ngx_null_string, 0 }
|
|
47 };
|
|
48
|
|
49
|
|
50 static ngx_command_t ngx_http_realip_commands[] = {
|
|
51
|
|
52 { ngx_string("set_real_ip_from"),
|
|
53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
54 ngx_http_realip_from,
|
|
55 NGX_HTTP_LOC_CONF_OFFSET,
|
|
56 0,
|
|
57 NULL },
|
|
58
|
|
59 { ngx_string("real_ip_header"),
|
|
60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
61 ngx_conf_set_enum_slot,
|
|
62 NGX_HTTP_LOC_CONF_OFFSET,
|
|
63 offsetof(ngx_http_realip_loc_conf_t, xfwd),
|
|
64 &ngx_http_realip_header },
|
|
65
|
|
66 ngx_null_command
|
|
67 };
|
|
68
|
|
69
|
|
70
|
216
|
71 static ngx_http_module_t ngx_http_realip_module_ctx = {
|
122
|
72 NULL, /* preconfiguration */
|
230
|
73 ngx_http_realip_init, /* postconfiguration */
|
122
|
74
|
|
75 NULL, /* create main configuration */
|
|
76 NULL, /* init main configuration */
|
|
77
|
|
78 NULL, /* create server configuration */
|
|
79 NULL, /* merge server configuration */
|
|
80
|
|
81 ngx_http_realip_create_loc_conf, /* create location configuration */
|
|
82 ngx_http_realip_merge_loc_conf /* merge location configuration */
|
|
83 };
|
|
84
|
|
85
|
|
86 ngx_module_t ngx_http_realip_module = {
|
|
87 NGX_MODULE_V1,
|
|
88 &ngx_http_realip_module_ctx, /* module context */
|
|
89 ngx_http_realip_commands, /* module directives */
|
|
90 NGX_HTTP_MODULE, /* module type */
|
|
91 NULL, /* init master */
|
230
|
92 NULL, /* init module */
|
122
|
93 NULL, /* init process */
|
|
94 NULL, /* init thread */
|
|
95 NULL, /* exit thread */
|
|
96 NULL, /* exit process */
|
|
97 NULL, /* exit master */
|
|
98 NGX_MODULE_V1_PADDING
|
|
99 };
|
|
100
|
|
101
|
|
102 static ngx_int_t
|
|
103 ngx_http_realip_handler(ngx_http_request_t *r)
|
|
104 {
|
|
105 u_char *ip, *p;
|
|
106 size_t len;
|
286
|
107 in_addr_t addr;
|
122
|
108 ngx_uint_t i;
|
|
109 struct sockaddr_in *sin;
|
396
|
110 ngx_connection_t *c;
|
|
111 ngx_pool_cleanup_t *cln;
|
|
112 ngx_http_realip_ctx_t *ctx;
|
122
|
113 ngx_http_realip_from_t *from;
|
|
114 ngx_http_realip_loc_conf_t *rlcf;
|
|
115
|
396
|
116 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
|
|
117
|
|
118 if (ctx) {
|
272
|
119 return NGX_DECLINED;
|
122
|
120 }
|
|
121
|
396
|
122 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
|
|
123 if (cln == NULL) {
|
|
124 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
125 }
|
|
126
|
122
|
127 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
|
|
128
|
|
129 if (rlcf->from == NULL) {
|
272
|
130 return NGX_DECLINED;
|
122
|
131 }
|
|
132
|
|
133 if (rlcf->xfwd == 0) {
|
|
134 if (r->headers_in.x_real_ip == NULL) {
|
272
|
135 return NGX_DECLINED;
|
122
|
136 }
|
|
137
|
|
138 len = r->headers_in.x_real_ip->value.len;
|
|
139 ip = r->headers_in.x_real_ip->value.data;
|
|
140
|
|
141 } else {
|
|
142 if (r->headers_in.x_forwarded_for == NULL) {
|
272
|
143 return NGX_DECLINED;
|
122
|
144 }
|
|
145
|
|
146 len = r->headers_in.x_forwarded_for->value.len;
|
|
147 ip = r->headers_in.x_forwarded_for->value.data;
|
|
148
|
286
|
149 for (p = ip + len - 1; p > ip; p--) {
|
122
|
150 if (*p == ' ' || *p == ',') {
|
286
|
151 p++;
|
|
152 len -= p - ip;
|
|
153 ip = p;
|
|
154 break;
|
122
|
155 }
|
|
156 }
|
|
157 }
|
|
158
|
396
|
159 c = r->connection;
|
|
160
|
|
161 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
|
286
|
162
|
122
|
163 /* AF_INET only */
|
|
164
|
396
|
165 sin = (struct sockaddr_in *) c->sockaddr;
|
122
|
166
|
|
167 from = rlcf->from->elts;
|
|
168 for (i = 0; i < rlcf->from->nelts; i++) {
|
|
169
|
396
|
170 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
|
122
|
171 "realip: %08XD %08XD %08XD",
|
|
172 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
|
|
173
|
|
174 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
|
|
175
|
396
|
176 ctx = cln->data;
|
|
177
|
|
178 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
|
286
|
179
|
|
180 addr = inet_addr((char *) ip);
|
|
181
|
|
182 if (addr == INADDR_NONE) {
|
|
183 return NGX_DECLINED;
|
|
184 }
|
122
|
185
|
396
|
186 p = ngx_pnalloc(c->pool, len);
|
286
|
187 if (p == NULL) {
|
|
188 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
189 }
|
122
|
190
|
286
|
191 ngx_memcpy(p, ip, len);
|
|
192
|
396
|
193 cln->handler = ngx_http_realip_cleanup;
|
|
194
|
|
195 ctx->connection = c;
|
|
196 ctx->addr = sin->sin_addr.s_addr;
|
|
197 ctx->addr_text = c->addr_text;
|
|
198
|
286
|
199 sin->sin_addr.s_addr = addr;
|
|
200
|
396
|
201 c->addr_text.len = len;
|
|
202 c->addr_text.data = p;
|
122
|
203
|
272
|
204 return NGX_DECLINED;
|
122
|
205 }
|
|
206 }
|
|
207
|
272
|
208 return NGX_DECLINED;
|
122
|
209 }
|
|
210
|
|
211
|
396
|
212 static void
|
|
213 ngx_http_realip_cleanup(void *data)
|
|
214 {
|
|
215 ngx_http_realip_ctx_t *ctx = data;
|
|
216
|
|
217 ngx_connection_t *c;
|
|
218 struct sockaddr_in *sin;
|
|
219
|
|
220 c = ctx->connection;
|
|
221
|
|
222 sin = (struct sockaddr_in *) c->sockaddr;
|
|
223 sin->sin_addr.s_addr = ctx->addr;
|
|
224
|
|
225 c->addr_text = ctx->addr_text;
|
|
226 }
|
|
227
|
|
228
|
122
|
229 static char *
|
|
230 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
231 {
|
|
232 ngx_http_realip_loc_conf_t *rlcf = conf;
|
|
233
|
326
|
234 ngx_int_t rc;
|
122
|
235 ngx_str_t *value;
|
|
236 ngx_inet_cidr_t in_cidr;
|
|
237 ngx_http_realip_from_t *from;
|
|
238
|
|
239 if (rlcf->from == NULL) {
|
|
240 rlcf->from = ngx_array_create(cf->pool, 2,
|
|
241 sizeof(ngx_http_realip_from_t));
|
|
242 if (rlcf->from == NULL) {
|
|
243 return NGX_CONF_ERROR;
|
|
244 }
|
|
245 }
|
|
246
|
|
247 from = ngx_array_push(rlcf->from);
|
|
248 if (from == NULL) {
|
|
249 return NGX_CONF_ERROR;
|
|
250 }
|
|
251
|
|
252 value = cf->args->elts;
|
|
253
|
326
|
254 rc = ngx_ptocidr(&value[1], &in_cidr);
|
|
255
|
|
256 if (rc == NGX_ERROR) {
|
122
|
257 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
|
|
258 &value[1]);
|
|
259 return NGX_CONF_ERROR;
|
|
260 }
|
|
261
|
326
|
262 if (rc == NGX_DONE) {
|
|
263 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
264 "low address bits of %V are meaningless", &value[1]);
|
|
265 }
|
|
266
|
122
|
267 from->mask = in_cidr.mask;
|
|
268 from->addr = in_cidr.addr;
|
|
269
|
|
270 return NGX_CONF_OK;
|
|
271 }
|
|
272
|
|
273
|
|
274 static void *
|
|
275 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
|
|
276 {
|
|
277 ngx_http_realip_loc_conf_t *conf;
|
|
278
|
|
279 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
|
|
280 if (conf == NULL) {
|
|
281 return NGX_CONF_ERROR;
|
|
282 }
|
|
283
|
|
284 /*
|
|
285 * set by ngx_pcalloc():
|
|
286 *
|
|
287 * conf->from = NULL;
|
|
288 */
|
|
289
|
|
290 conf->xfwd = NGX_CONF_UNSET_UINT;
|
|
291
|
|
292 return conf;
|
|
293 }
|
|
294
|
|
295
|
|
296 static char *
|
|
297 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
298 {
|
|
299 ngx_http_realip_loc_conf_t *prev = parent;
|
|
300 ngx_http_realip_loc_conf_t *conf = child;
|
|
301
|
|
302 if (conf->from == NULL) {
|
|
303 conf->from = prev->from;
|
|
304 }
|
|
305
|
212
|
306 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0);
|
122
|
307
|
|
308 return NGX_CONF_OK;
|
|
309 }
|
|
310
|
|
311
|
|
312 static ngx_int_t
|
230
|
313 ngx_http_realip_init(ngx_conf_t *cf)
|
122
|
314 {
|
|
315 ngx_http_handler_pt *h;
|
|
316 ngx_http_core_main_conf_t *cmcf;
|
|
317
|
230
|
318 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
122
|
319
|
|
320 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
|
|
321 if (h == NULL) {
|
|
322 return NGX_ERROR;
|
|
323 }
|
|
324
|
|
325 *h = ngx_http_realip_handler;
|
|
326
|
130
|
327 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
122
|
328 if (h == NULL) {
|
|
329 return NGX_ERROR;
|
|
330 }
|
|
331
|
|
332 *h = ngx_http_realip_handler;
|
|
333
|
|
334 return NGX_OK;
|
|
335 }
|