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comparison ngx_http_ip_tos_filter_module.c @ 0:18515436c0f1

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Ip tos filter module.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 23 Jul 2009 13:18:42 +0400
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children a23404790f33
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-1:000000000000 0:18515436c0f1
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_uint_t tos;
14 } ngx_http_ip_tos_conf_t;
15
16
17 static void *ngx_http_ip_tos_create_conf(ngx_conf_t *cf);
18 static char *ngx_http_ip_tos_merge_conf(ngx_conf_t *cf, void *parent,
19 void *child);
20 static char *ngx_http_ip_tos(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
21 static ngx_int_t ngx_http_ip_tos_init(ngx_conf_t *cf);
22
23
24 static ngx_command_t ngx_http_ip_tos_commands[] = {
25
26 { ngx_string("ip_tos"),
27 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
28 ngx_http_ip_tos,
29 NGX_HTTP_LOC_CONF_OFFSET,
30 0,
31 NULL },
32
33 ngx_null_command
34 };
35
36
37 static ngx_http_module_t ngx_http_ip_tos_module_ctx = {
38 NULL, /* preconfiguration */
39 ngx_http_ip_tos_init, /* postconfiguration */
40
41 NULL, /* create main configuration */
42 NULL, /* init main configuration */
43
44 NULL, /* create server configuration */
45 NULL, /* merge server configuration */
46
47 ngx_http_ip_tos_create_conf, /* create location configuration */
48 ngx_http_ip_tos_merge_conf /* merge location configuration */
49 };
50
51
52 ngx_module_t ngx_http_ip_tos_filter_module = {
53 NGX_MODULE_V1,
54 &ngx_http_ip_tos_module_ctx, /* module context */
55 ngx_http_ip_tos_commands, /* module directives */
56 NGX_HTTP_MODULE, /* module type */
57 NULL, /* init master */
58 NULL, /* init module */
59 NULL, /* init process */
60 NULL, /* init thread */
61 NULL, /* exit thread */
62 NULL, /* exit process */
63 NULL, /* exit master */
64 NGX_MODULE_V1_PADDING
65 };
66
67
68 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
69
70
71 static ngx_int_t
72 ngx_http_ip_tos_header_filter(ngx_http_request_t *r)
73 {
74 int tos;
75 ngx_http_ip_tos_conf_t *conf;
76
77 if (r != r->main) {
78 return ngx_http_next_header_filter(r);
79 }
80
81 conf = ngx_http_get_module_loc_conf(r, ngx_http_ip_tos_filter_module);
82
83 if (!conf->enable) {
84 return ngx_http_next_header_filter(r);
85 }
86
87 tos = conf->tos;
88
89 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
90 "ip tos: 0x%02Xi", tos);
91
92 if (setsockopt(r->connection->fd, IPPROTO_IP, IP_TOS,
93 (const void *) &tos, sizeof(tos)) == -1)
94 {
95 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_socket_errno,
96 "setsockopt(IP_TOS) failed");
97 }
98
99 return ngx_http_next_header_filter(r);
100 }
101
102
103 static void *
104 ngx_http_ip_tos_create_conf(ngx_conf_t *cf)
105 {
106 ngx_http_ip_tos_conf_t *conf;
107
108 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_ip_tos_conf_t));
109 if (conf == NULL) {
110 return NULL;
111 }
112
113 conf->enable = NGX_CONF_UNSET;
114 conf->tos = NGX_CONF_UNSET_UINT;
115
116 return conf;
117 }
118
119
120 static char *
121 ngx_http_ip_tos_merge_conf(ngx_conf_t *cf, void *parent, void *child)
122 {
123 ngx_http_ip_tos_conf_t *prev = parent;
124 ngx_http_ip_tos_conf_t *conf = child;
125
126 ngx_conf_merge_value(conf->enable, prev->enable, 0);
127 ngx_conf_merge_uint_value(conf->tos, prev->tos, 0);
128
129 return NGX_CONF_OK;
130 }
131
132
133 static char *
134 ngx_http_ip_tos(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
135 {
136 ngx_http_ip_tos_conf_t *itcf = conf;
137
138 ngx_int_t n;
139 ngx_str_t *value;
140
141 if (itcf->enable != NGX_CONF_UNSET) {
142 return "is duplicate";
143 }
144
145 value = cf->args->elts;
146
147 if (ngx_strcasecmp(value[1].data, (u_char *) "off") == 0) {
148 itcf->enable = 0;
149 return NGX_CONF_OK;
150 }
151
152 if (value[1].len != 4 || value[1].data[0] != '0' ||
153 (value[1].data[1] != 'x' && value[1].data[1] != 'X'))
154 {
155 return "invalid argument 1";
156 }
157
158 n = ngx_hextoi(value[1].data + 2, value[1].len - 2);
159 if (n == NGX_ERROR || n < 0 || n > 255) {
160 return "invalid argument 2";
161 }
162
163 itcf->enable = 1;
164 itcf->tos = n;
165
166 return NGX_CONF_OK;
167 }
168
169
170 static ngx_int_t
171 ngx_http_ip_tos_init(ngx_conf_t *cf)
172 {
173 ngx_http_next_header_filter = ngx_http_top_header_filter;
174 ngx_http_top_header_filter = ngx_http_ip_tos_header_filter;
175
176 return NGX_OK;
177 }