Add REMOTE_HOST functionality to NGINX mod-security - ngx_http_modsecurity.c

gistfile1.c

static inline u_char *get_rdns_hostname(ngx_http_request_t *r);


        //ctx->connection->remote_host = NULL;
        ctx->connection->remote_host = (char *)get_rdns_hostname(r);



static inline u_char *
get_rdns_hostname(ngx_http_request_t *r){
    ngx_str_t variable_name = ngx_string("rdns_hostname");

    u_char  *dst;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "ModSecurity: get_rdns_hostname");

    ngx_int_t hash = ngx_hash_key(variable_name.data, variable_name.len);

    ngx_http_variable_value_t *rdns_hostname_var =
       ngx_http_get_variable( r, &variable_name, hash);

    if( rdns_hostname_var &&
        !rdns_hostname_var->not_found &&
         rdns_hostname_var->valid){

        dst = ngx_pnalloc(r->pool, rdns_hostname_var->len + 1);
        if (dst == NULL) {
          return NULL;
        }

        ngx_memcpy(dst, rdns_hostname_var->data, rdns_hostname_var->len);
        dst[rdns_hostname_var->len] = '\0';

        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "ModSecurity: rdns_hostname: \"%s\"",
                       dst);

        return dst;
    }

    return NULL;
}