Create Web Server Filter by apache module
You can controll Web server (IIS, apache) with adding module as follows.
This is a exsample that display “overtime” when it was accessed except from 8:00 to 18:00.
1. Environment
OS: CentOS7.7
apache: 2.4.6
2. Install apxs
yum install httpd-devel
3. Create template
cd /tmp/work/ apxs -g -n sample01
4. modify source code.
/* The sample content handler */
static int sample01_handler(request_rec *r)
{
time_t timer;
struct tm *t_st;
char buff[256];
time(&timer);
t_st = localtime(&timer);
sprintf(buff,"%02d%02d", t_st->tm_hour, t_st->tm_min);
if(strcmp(buff,"0800")>=0 && (strcmp(buff,"1800")<=0)){
return DECLINED;
}
else {
r->content_type = "text/html";
if(!r->header_only){
ap_rputs("<html><body>overtime</body></html>", r);
}
return OK;
}
}
static void sample01_register_hooks(apr_pool_t *p)
{
ap_hook_handler(sample01_handler, NULL, NULL, APR_HOOK_FIRST);
}
5. Make
apxs -c mod_sample01.c
6. copy module to apache modules directory.
cp .libs/mod_sample01.so /etc/httpd/modules/
7. modify apache config. order to load the module at first.
# # Dynamic Shared Object (DSO) Support # # To be able to use the functionality of a module which was built as a DSO you # have to place corresponding `LoadModule' lines at this location so the # directives contained in it are actually available _before_ they are used. # Statically compiled modules (those listed by `httpd -l') do not need # to be loaded here. # # Example: # LoadModule foo_module modules/mod_foo.so # LoadModule sample01_module modules/mod_sample01.so Include conf.modules.d/*.conf
8. restart apache