Add a procedure to std vmod to manipulate the IP TOS byte of the

client connection:

	VOID set_ip_tos(INT)

Fixes:	#773



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5206 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/m00001.vtc

@@ -13,6 +13,7 @@ varnish v1 -vcl+backend {
 	sub vcl_deliver {
 		set resp.http.foo = std.toupper(resp.http.foo);
 		set resp.http.bar = std.tolower(resp.http.bar);
+		std.set_ip_tos(32);
 	}
 } -start
 
@@ -54,3 +55,12 @@ varnish v1 -badvcl {
 	import std from "${topbuild}/lib/libvmod_std/.libs/libvmod_std.so.1" ;
 }
 
+varnish v1 -badvcl {
+	import std from "${topbuild}/lib/libvmod_std/.libs/libvmod_std.so.1" ;
+
+	sub vcl_recv {
+		if (std == 2) {
+		}
+	}
+}
+

lib/libvmod_std/vmod.py

@@ -60,6 +60,7 @@ ctypes = {
 	'INT':		"int",
 	'HEADER':	"const char *",
 	'PRIV_VCL':	"void **",
+	'VOID':		"void",
 }
 
 #######################################################################

lib/libvmod_std/vmod.vcc

@@ -2,3 +2,4 @@ Module std
 Meta meta_function
 Function STRING toupper(STRING_LIST)
 Function STRING tolower(PRIV_VCL, STRING_LIST)
+Function VOID set_ip_tos(INT)

lib/libvmod_std/vmod_std.c

 #include <ctype.h>
 #include <stdarg.h>
+#include <netinet/in.h>
 #include "vrt.h"
 #include "../../bin/varnishd/cache.h"
 
 #include "vcc_if.h"
 
+void
+vmod_set_ip_tos(struct sess *sp, int tos)
+{
+
+	TCP_Assert(setsockopt(sp->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)));
+}
+
 static const char *
 vmod_updown(struct sess *sp, int up, const char *s, va_list ap)
 {