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pppoe: Add support for -c and -C to enable/disable header compression (thanks k0ga)

--- a/sys/man/8/ppp

+++ b/sys/man/8/ppp

@@ -34,7 +34,7 @@

 .PP

 .B ip/pppoe

 [

-.B -Pd

+.B -PdcC

 ]

 [

 .B -A

--- a/sys/src/cmd/ip/pppoe.c

+++ b/sys/src/cmd/ip/pppoe.c

@@ -28,11 +28,12 @@

 int cookielen;

 uchar etherdst[6];

 int mtu = 1492;

+int pktcompress, hdrcompress;

 void

 usage(void)

 {

-	fprint(2, "usage: pppoe [-Pd] [-A acname] [-S srvname] [-k keyspec] [-m mtu] [-x pppnet] [ether0]\n");

+	fprint(2, "usage: pppoe [-PdcC] [-A acname] [-S srvname] [-k keyspec] [-m mtu] [-x pppnet] [ether0]\n");

 	exits("usage");

 }

@@ -75,6 +76,12 @@

 	case 'k':

 		keyspec = EARGF(usage());

 		break;

+	case 'c':

+		pktcompress = 1;

+		break;

+	case 'C':

+		hdrcompress = 1;

+		break;

 	case 'x':

 		pppnetmtpt = EARGF(usage());

 		break;

@@ -526,6 +533,10 @@

 		argv[argc++] = "-d";

 	if(primary)

 		argv[argc++] = "-P";

+	if(hdrcompress)

+		argv[argc++] = "-C";

+	if(pktcompress)

+		argv[argc++] = "-c";

 	if(pppnetmtpt){

 		argv[argc++] = "-x";

 		argv[argc++] = pppnetmtpt;