gistfile1.c

C{
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
}C

C{
//
// This is a hack from Igor Gariev (gariev hotmail com):
// Copy IP address from "X-Forwarded-For" header
// into Varnish's client_ip structure.
// This works with Varnish 3.0.1; test with other versions
//
// Trusted "X-Forwarded-For" header is a must!
// No commas are allowed. If your load balancer something other
// than a single IP, then use a regsub() to fix it.
//
struct sockaddr *client_ip_ss = VRT_r_client_ip(sp);
struct sockaddr_in *client_ip_si = (struct sockaddr_in *) client_ip_ss;
struct in_addr *client_ip_ia = &(client_ip_si->sin_addr);
char *xff_ip = VRT_GetHdr(sp, HDR_REQ, "\020X-Forwarded-For:");

if (xff_ip != NULL) {
// Copy the ip address into the struct's sin_addr.
inet_pton(AF_INET, xff_ip, client_ip_ia);
}
}C