Writing a module to use with http_proxy

Server NGINX
1

Hi. I’m new to nginx module development and I’m going to write a module
that must do everything that http_proxy module does except it must do
some checks before request is passed to the upstream. What’s the best
way to do that?

Thank you.

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2

To be more precise I need some functionalty to check request and pass it
to some (formed manually) other url if it passes check procedure and if
the check fails - return 404 back to client.

Thank you.

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3

I’ve tried to start and I faced a ‘segmentation fault’ error. I tried to
add handler to NGX_HTTP_ACCESS_PHASE and that causes segmentation fault.
Here’s the code. Init function is called from merge_loc_conf
function…

// auth check handler
static ngx_int_t ngx_http_zd_aws_proxy_check(ngx_http_request_t *r)
{
return NGX_HTTP_FORBIDDEN;
}

// Config initializer, adds core handler to check auth
static ngx_int_t ngx_http_zd_aws_proxy_init(ngx_conf_t *cf)
{

ngx_http_handler_pt        *h;
ngx_http_core_main_conf_t  *cmcf;

cmcf = ngx_http_conf_get_module_main_conf(cf,

ngx_http_core_module);

h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
if (h == NULL) {
    return NGX_ERROR;
}

*h = ngx_http_zd_aws_proxy_check;

return NGX_OK;

}

Any thoughts on that ?

Thank you.

Posted at Nginx Forum:

4

I’ve resolved the problem by addind ‘init’ function into
postconfiguration slot of module context.
The next problem is to find out how to get module conf variables from
there

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