0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Maxim Dounin
|
|
4 */
|
|
5
|
|
6 #include <ngx_config.h>
|
|
7 #include <ngx_core.h>
|
|
8 #include <ngx_http.h>
|
|
9
|
|
10
|
|
11 typedef struct {
|
|
12 ngx_flag_t enable;
|
|
13 } ngx_http_catch_body_conf_t;
|
|
14
|
|
15
|
|
16 static void *ngx_http_catch_body_create_conf(ngx_conf_t *cf);
|
|
17 static char *ngx_http_catch_body_merge_conf(ngx_conf_t *cf, void *parent,
|
|
18 void *child);
|
|
19 static ngx_int_t ngx_http_catch_body_init(ngx_conf_t *cf);
|
|
20
|
|
21
|
|
22 static ngx_command_t ngx_http_catch_body_commands[] = {
|
|
23
|
|
24 { ngx_string("catch_body"),
|
|
25 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
|
|
26 ngx_conf_set_flag_slot,
|
|
27 NGX_HTTP_LOC_CONF_OFFSET,
|
|
28 offsetof(ngx_http_catch_body_conf_t, enable),
|
|
29 NULL },
|
|
30
|
|
31 ngx_null_command
|
|
32 };
|
|
33
|
|
34
|
|
35 static ngx_http_module_t ngx_http_catch_body_module_ctx = {
|
|
36 NULL, /* preconfiguration */
|
|
37 ngx_http_catch_body_init, /* postconfiguration */
|
|
38
|
|
39 NULL, /* create main configuration */
|
|
40 NULL, /* init main configuration */
|
|
41
|
|
42 NULL, /* create server configuration */
|
|
43 NULL, /* merge server configuration */
|
|
44
|
|
45 ngx_http_catch_body_create_conf, /* create location configuration */
|
|
46 ngx_http_catch_body_merge_conf /* merge location configuration */
|
|
47 };
|
|
48
|
|
49
|
|
50 ngx_module_t ngx_http_catch_body_filter_module = {
|
|
51 NGX_MODULE_V1,
|
|
52 &ngx_http_catch_body_module_ctx, /* module context */
|
|
53 ngx_http_catch_body_commands, /* module directives */
|
|
54 NGX_HTTP_MODULE, /* module type */
|
|
55 NULL, /* init master */
|
|
56 NULL, /* init module */
|
|
57 NULL, /* init process */
|
|
58 NULL, /* init thread */
|
|
59 NULL, /* exit thread */
|
|
60 NULL, /* exit process */
|
|
61 NULL, /* exit master */
|
|
62 NGX_MODULE_V1_PADDING
|
|
63 };
|
|
64
|
|
65
|
|
66 static ngx_http_request_body_filter_pt ngx_http_next_request_body_filter;
|
|
67
|
|
68
|
|
69 static ngx_int_t
|
|
70 ngx_http_catch_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
|
|
71 {
|
|
72 u_char *p;
|
|
73 ngx_chain_t *cl;
|
|
74 ngx_http_catch_body_conf_t *conf;
|
|
75
|
|
76 conf = ngx_http_get_module_loc_conf(r, ngx_http_catch_body_filter_module);
|
|
77
|
|
78 if (!conf->enable) {
|
|
79 return ngx_http_next_request_body_filter(r, in);
|
|
80 }
|
|
81
|
|
82 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
83 "catch request body filter");
|
|
84
|
|
85 for (cl = in; cl; cl = cl->next) {
|
|
86
|
|
87 p = cl->buf->pos;
|
|
88
|
|
89 for (p = cl->buf->pos; p < cl->buf->last; p++) {
|
|
90
|
|
91 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
92 "catch body in:%02Xd:%c", *p, *p);
|
|
93
|
|
94 if (*p == 'X') {
|
|
95 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
96 "catch body: found");
|
|
97 return NGX_HTTP_FORBIDDEN;
|
|
98 }
|
|
99 }
|
|
100 }
|
|
101
|
|
102 return ngx_http_next_request_body_filter(r, in);
|
|
103 }
|
|
104
|
|
105
|
|
106 static void *
|
|
107 ngx_http_catch_body_create_conf(ngx_conf_t *cf)
|
|
108 {
|
|
109 ngx_http_catch_body_conf_t *conf;
|
|
110
|
|
111 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_catch_body_conf_t));
|
|
112 if (conf == NULL) {
|
|
113 return NULL;
|
|
114 }
|
|
115
|
|
116 conf->enable = NGX_CONF_UNSET;
|
|
117
|
|
118 return conf;
|
|
119 }
|
|
120
|
|
121
|
|
122 static char *
|
|
123 ngx_http_catch_body_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
124 {
|
|
125 ngx_http_catch_body_conf_t *prev = parent;
|
|
126 ngx_http_catch_body_conf_t *conf = child;
|
|
127
|
|
128 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
129
|
|
130 return NGX_CONF_OK;
|
|
131 }
|
|
132
|
|
133
|
|
134 static ngx_int_t
|
|
135 ngx_http_catch_body_init(ngx_conf_t *cf)
|
|
136 {
|
|
137 ngx_http_next_request_body_filter = ngx_http_top_request_body_filter;
|
|
138 ngx_http_top_request_body_filter = ngx_http_catch_body_filter;
|
|
139
|
|
140 return NGX_OK;
|
|
141 }
|