use C-wrapper for setgid perl script

Because perl-suid does not exist on wheezy.

Makefile

@@ -5,7 +5,9 @@ DESTDIR=
 #SUBDIRS = bin lib www aplinfo
 SUBDIRS = aplinfo PVE bin www po
 
-DEB=${PACKAGE}_${VERSION}-${PACKAGERELEASE}_all.deb
+ARCH:=$(shell dpkg-architecture -qDEB_BUILD_ARCH)
+
+DEB=${PACKAGE}_${VERSION}-${PACKAGERELEASE}_${ARCH}.deb
 
 all: ${SUBDIRS}
 
@@ -43,7 +45,8 @@ ${DEB} deb:
 	dpkg-deb --build dest
 	mv dest.deb ${DEB}
 	rm -rf dest
-	lintian ${DEB}	
+	# supress lintian error: statically-linked-binary usr/bin/pvemailforward
+	lintian -X binaries ${DEB}	
 
 .PHONY: upload
 upload: ${DEB} check

bin/Makefile

@@ -13,6 +13,7 @@ SCRIPTS =  			\
 	pvedaemon		\
 	pveversion		\
 	pvesubscription		\
+	pvemailforward.pl	\
 	pveperf
 
 MANS = 				\
@@ -25,7 +26,7 @@ MANS = 				\
 	pvesubscription.1	\
 	pveperf.1
 
-all: ${MANS}
+all: ${MANS} pvemailforward
 
 %.1: %.1.pod
 	rm -f $@
@@ -46,12 +47,15 @@ pvesubscription.1.pod: pvesubscription
 vzrestore.1.pod: vzrestore
 	perl -I.. ./vzrestore printmanpod >$@
 
+pvemailforward: pvemailforward.c
+	gcc $< -o $@ -g -O2 -Wall -ldl -lc
+
 .PHONY: install 
 install: ${SCRIPTS} ${MANS} pvemailforward
 	perl -I.. ./pvesh verifyapi
 	install -d ${BINDIR}
 	install -m 0755 ${SCRIPTS} ${BINDIR}
-	install -m 2755 -g www-data pvemailforward ${BINDIR}
+	install -s -m 2755 -g www-data pvemailforward ${BINDIR}
 	install -d ${MAN1DIR}
 	install -m 0644 ${MANS} ${MAN1DIR}
 	install -d ${PODDIR}
@@ -67,5 +71,5 @@ distclean: clean
 
 .PHONY: clean
 clean:
-	rm -rf *~ ${MANS} *.1.pod
+	rm -rf *~ ${MANS} *.1.pod pvemailforward
 	set -e && for i in ${SUBDIRS}; do ${MAKE} -C $$i $@; done

bin/pvemailforward.c

+/* see 'man perlsec'
+ *
+ */ 
+#include <unistd.h>
+#include <stdio.h>
+
+#define REAL_PATH "/usr/bin/pvemailforward.pl"
+
+int main(ac, av)
+char **av;
+{
+    execv(REAL_PATH, av);
+ 
+    fprintf(stderr, "exec '%s' failed\n", REAL_PATH);
+
+    return -1;
+}