|
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 {
|
|
|
15 in_addr_t mask;
|
|
|
16 in_addr_t addr;
|
|
|
17 } ngx_http_realip_from_t;
|
|
|
18
|
|
|
19
|
|
|
20 typedef struct {
|
|
|
21 ngx_array_t *from; /* array of ngx_http_realip_from_t */
|
|
|
22
|
|
|
23 ngx_uint_t xfwd;
|
|
|
24 } ngx_http_realip_loc_conf_t;
|
|
|
25
|
|
|
26
|
|
|
27 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
|
|
|
28 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
|
29 void *conf);
|
|
|
30 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
|
|
|
31 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
|
|
|
32 void *parent, void *child);
|
|
230
|
33 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
|
|
122
|
34
|
|
|
35
|
|
|
36 static ngx_conf_enum_t ngx_http_realip_header[] = {
|
|
|
37 { ngx_string("X-Forwarded-For"), 1 },
|
|
|
38 { ngx_string("X-Real-IP"), 0 },
|
|
|
39 { ngx_null_string, 0 }
|
|
|
40 };
|
|
|
41
|
|
|
42
|
|
|
43 static ngx_command_t ngx_http_realip_commands[] = {
|
|
|
44
|
|
|
45 { ngx_string("set_real_ip_from"),
|
|
|
46 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
|
47 ngx_http_realip_from,
|
|
|
48 NGX_HTTP_LOC_CONF_OFFSET,
|
|
|
49 0,
|
|
|
50 NULL },
|
|
|
51
|
|
|
52 { ngx_string("real_ip_header"),
|
|
|
53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
|
|
|
54 ngx_conf_set_enum_slot,
|
|
|
55 NGX_HTTP_LOC_CONF_OFFSET,
|
|
|
56 offsetof(ngx_http_realip_loc_conf_t, xfwd),
|
|
|
57 &ngx_http_realip_header },
|
|
|
58
|
|
|
59 ngx_null_command
|
|
|
60 };
|
|
|
61
|
|
|
62
|
|
|
63
|
|
216
|
64 static ngx_http_module_t ngx_http_realip_module_ctx = {
|
|
122
|
65 NULL, /* preconfiguration */
|
|
230
|
66 ngx_http_realip_init, /* postconfiguration */
|
|
122
|
67
|
|
|
68 NULL, /* create main configuration */
|
|
|
69 NULL, /* init main configuration */
|
|
|
70
|
|
|
71 NULL, /* create server configuration */
|
|
|
72 NULL, /* merge server configuration */
|
|
|
73
|
|
|
74 ngx_http_realip_create_loc_conf, /* create location configuration */
|
|
|
75 ngx_http_realip_merge_loc_conf /* merge location configuration */
|
|
|
76 };
|
|
|
77
|
|
|
78
|
|
|
79 ngx_module_t ngx_http_realip_module = {
|
|
|
80 NGX_MODULE_V1,
|
|
|
81 &ngx_http_realip_module_ctx, /* module context */
|
|
|
82 ngx_http_realip_commands, /* module directives */
|
|
|
83 NGX_HTTP_MODULE, /* module type */
|
|
|
84 NULL, /* init master */
|
|
230
|
85 NULL, /* init module */
|
|
122
|
86 NULL, /* init process */
|
|
|
87 NULL, /* init thread */
|
|
|
88 NULL, /* exit thread */
|
|
|
89 NULL, /* exit process */
|
|
|
90 NULL, /* exit master */
|
|
|
91 NGX_MODULE_V1_PADDING
|
|
|
92 };
|
|
|
93
|
|
|
94
|
|
|
95 static ngx_int_t
|
|
|
96 ngx_http_realip_handler(ngx_http_request_t *r)
|
|
|
97 {
|
|
|
98 u_char *ip, *p;
|
|
|
99 size_t len;
|
|
286
|
100 in_addr_t addr;
|
|
122
|
101 ngx_uint_t i;
|
|
|
102 struct sockaddr_in *sin;
|
|
|
103 ngx_http_realip_from_t *from;
|
|
|
104 ngx_http_realip_loc_conf_t *rlcf;
|
|
|
105
|
|
|
106 if (r->realip_set) {
|
|
272
|
107 return NGX_DECLINED;
|
|
122
|
108 }
|
|
|
109
|
|
|
110 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
|
|
|
111
|
|
|
112 if (rlcf->from == NULL) {
|
|
272
|
113 return NGX_DECLINED;
|
|
122
|
114 }
|
|
|
115
|
|
|
116 if (rlcf->xfwd == 0) {
|
|
|
117 if (r->headers_in.x_real_ip == NULL) {
|
|
272
|
118 return NGX_DECLINED;
|
|
122
|
119 }
|
|
|
120
|
|
|
121 len = r->headers_in.x_real_ip->value.len;
|
|
|
122 ip = r->headers_in.x_real_ip->value.data;
|
|
|
123
|
|
|
124 } else {
|
|
|
125 if (r->headers_in.x_forwarded_for == NULL) {
|
|
272
|
126 return NGX_DECLINED;
|
|
122
|
127 }
|
|
|
128
|
|
|
129 len = r->headers_in.x_forwarded_for->value.len;
|
|
|
130 ip = r->headers_in.x_forwarded_for->value.data;
|
|
|
131
|
|
286
|
132 for (p = ip + len - 1; p > ip; p--) {
|
|
122
|
133 if (*p == ' ' || *p == ',') {
|
|
286
|
134 p++;
|
|
|
135 len -= p - ip;
|
|
|
136 ip = p;
|
|
|
137 break;
|
|
122
|
138 }
|
|
|
139 }
|
|
|
140 }
|
|
|
141
|
|
286
|
142 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
143 "realip: \"%s\"", ip);
|
|
|
144
|
|
122
|
145 /* AF_INET only */
|
|
|
146
|
|
|
147 sin = (struct sockaddr_in *) r->connection->sockaddr;
|
|
|
148
|
|
|
149 from = rlcf->from->elts;
|
|
|
150 for (i = 0; i < rlcf->from->nelts; i++) {
|
|
|
151
|
|
|
152 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
153 "realip: %08XD %08XD %08XD",
|
|
|
154 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
|
|
|
155
|
|
|
156 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
|
|
|
157
|
|
286
|
158 r->realip_set = 1;
|
|
|
159
|
|
|
160 addr = inet_addr((char *) ip);
|
|
|
161
|
|
|
162 if (addr == INADDR_NONE) {
|
|
|
163 return NGX_DECLINED;
|
|
|
164 }
|
|
122
|
165
|
|
382
|
166 p = ngx_pnalloc(r->connection->pool, len);
|
|
286
|
167 if (p == NULL) {
|
|
|
168 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
169 }
|
|
122
|
170
|
|
286
|
171 ngx_memcpy(p, ip, len);
|
|
|
172
|
|
|
173 sin->sin_addr.s_addr = addr;
|
|
|
174
|
|
|
175 r->connection->addr_text.len = len;
|
|
|
176 r->connection->addr_text.data = p;
|
|
122
|
177
|
|
272
|
178 return NGX_DECLINED;
|
|
122
|
179 }
|
|
|
180 }
|
|
|
181
|
|
272
|
182 return NGX_DECLINED;
|
|
122
|
183 }
|
|
|
184
|
|
|
185
|
|
|
186 static char *
|
|
|
187 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
188 {
|
|
|
189 ngx_http_realip_loc_conf_t *rlcf = conf;
|
|
|
190
|
|
326
|
191 ngx_int_t rc;
|
|
122
|
192 ngx_str_t *value;
|
|
|
193 ngx_inet_cidr_t in_cidr;
|
|
|
194 ngx_http_realip_from_t *from;
|
|
|
195
|
|
|
196 if (rlcf->from == NULL) {
|
|
|
197 rlcf->from = ngx_array_create(cf->pool, 2,
|
|
|
198 sizeof(ngx_http_realip_from_t));
|
|
|
199 if (rlcf->from == NULL) {
|
|
|
200 return NGX_CONF_ERROR;
|
|
|
201 }
|
|
|
202 }
|
|
|
203
|
|
|
204 from = ngx_array_push(rlcf->from);
|
|
|
205 if (from == NULL) {
|
|
|
206 return NGX_CONF_ERROR;
|
|
|
207 }
|
|
|
208
|
|
|
209 value = cf->args->elts;
|
|
|
210
|
|
|
211 from->addr = inet_addr((char *) value[1].data);
|
|
|
212
|
|
|
213 if (from->addr != INADDR_NONE) {
|
|
|
214 from->mask = 0xffffffff;
|
|
|
215
|
|
|
216 return NGX_CONF_OK;
|
|
|
217 }
|
|
|
218
|
|
326
|
219 rc = ngx_ptocidr(&value[1], &in_cidr);
|
|
|
220
|
|
|
221 if (rc == NGX_ERROR) {
|
|
122
|
222 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
|
|
|
223 &value[1]);
|
|
|
224 return NGX_CONF_ERROR;
|
|
|
225 }
|
|
|
226
|
|
326
|
227 if (rc == NGX_DONE) {
|
|
|
228 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
229 "low address bits of %V are meaningless", &value[1]);
|
|
|
230 }
|
|
|
231
|
|
122
|
232 from->mask = in_cidr.mask;
|
|
|
233 from->addr = in_cidr.addr;
|
|
|
234
|
|
|
235 return NGX_CONF_OK;
|
|
|
236 }
|
|
|
237
|
|
|
238
|
|
|
239 static void *
|
|
|
240 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
|
|
|
241 {
|
|
|
242 ngx_http_realip_loc_conf_t *conf;
|
|
|
243
|
|
|
244 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
|
|
|
245 if (conf == NULL) {
|
|
|
246 return NGX_CONF_ERROR;
|
|
|
247 }
|
|
|
248
|
|
|
249 /*
|
|
|
250 * set by ngx_pcalloc():
|
|
|
251 *
|
|
|
252 * conf->from = NULL;
|
|
|
253 */
|
|
|
254
|
|
|
255 conf->xfwd = NGX_CONF_UNSET_UINT;
|
|
|
256
|
|
|
257 return conf;
|
|
|
258 }
|
|
|
259
|
|
|
260
|
|
|
261 static char *
|
|
|
262 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
263 {
|
|
|
264 ngx_http_realip_loc_conf_t *prev = parent;
|
|
|
265 ngx_http_realip_loc_conf_t *conf = child;
|
|
|
266
|
|
|
267 if (conf->from == NULL) {
|
|
|
268 conf->from = prev->from;
|
|
|
269 }
|
|
|
270
|
|
212
|
271 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0);
|
|
122
|
272
|
|
|
273 return NGX_CONF_OK;
|
|
|
274 }
|
|
|
275
|
|
|
276
|
|
|
277 static ngx_int_t
|
|
230
|
278 ngx_http_realip_init(ngx_conf_t *cf)
|
|
122
|
279 {
|
|
|
280 ngx_http_handler_pt *h;
|
|
|
281 ngx_http_core_main_conf_t *cmcf;
|
|
|
282
|
|
230
|
283 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
122
|
284
|
|
|
285 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
|
|
|
286 if (h == NULL) {
|
|
|
287 return NGX_ERROR;
|
|
|
288 }
|
|
|
289
|
|
|
290 *h = ngx_http_realip_handler;
|
|
|
291
|
|
130
|
292 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
122
|
293 if (h == NULL) {
|
|
|
294 return NGX_ERROR;
|
|
|
295 }
|
|
|
296
|
|
|
297 *h = ngx_http_realip_handler;
|
|
|
298
|
|
|
299 return NGX_OK;
|
|
|
300 }
|
