Nginx 模块开发

最新推荐文章于 2025-08-18 09:26:30 发布

原创最新推荐文章于 2025-08-18 09:26:30 发布 · 554 阅读

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#nginx #Nginx

初级教程

http://www.evanmiller.org/nginx-modules-guide.html

高级教程

http://www.evanmiller.org/nginx-modules-guide-advanced.html

假设要作广告过滤，通过URL HOST 来过滤一些请求的简单样例，字符串处理有BUG

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_string.h>

static ngx_int_t ngx_http_adfilter_init(ngx_conf_t *cf);
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;

static ngx_http_module_t ngx_http_adfilter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_adfilter_init, /* postconfiguration */

NULL, /* create main configuration */
NULL, /* init main configuration */

NULL, /* create server configuration */
NULL, /* merge server configuration */

NULL, /* create location configuration */
NULL, /* merge location configuration */
};

ngx_module_t ngx_http_adfilter_module = {
    NGX_MODULE_V1,
    &ngx_http_adfilter_module_ctx,     /* module context */
    NULL,                                  /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};

ngx_int_t
ngx_http_adfilter(ngx_http_request_t *r, ngx_chain_t *in)
{
    ngx_connection_t          *c;
int len = 0;
    c = r->connection;
    if (c->error) {
       return NGX_ERROR;
    }

len = r->host_end - r->host_start + 1;
char * adhost = "i0.sinaimg.cn";
u_char * str = (u_char*)ngx_alloc( sizeof(u_char) * len , c->log);
ngx_memcpy(str, r->host_start, len -1 );
str[len-1] = '\0';

ngx_log_debug1(NGX_LOG_INFO, c->log,NGX_LOG_INFO, "Host is: [%s]", str);
if(0 == strncmp(adhost, (char*)str, strlen(adhost)))
{
ngx_log_debug1(NGX_LOG_INFO, c->log,NGX_LOG_INFO, "!!! Skip Host: %s", str);
return NGX_OK;
}

ngx_calloc(sizeof(str), c->log);

return ngx_http_next_body_filter(r,in);
}

ngx_int_t ngx_http_adfilter_init(ngx_conf_t *cf)
{
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_adfilter;
return NGX_OK;
}