code: plan9front

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ip/ipconfig: add "null" verb to bind nullmedium

Example usage:

ip/ipconfig null /dev/mordor 8.8.8.8 /128

--- a/sys/src/cmd/ip/ipconfig/ipconfig.h

+++ b/sys/src/cmd/ip/ipconfig/ipconfig.h

@@ -16,6 +16,7 @@

 	Vtorus,

 	Vtree,

 	Vpkt,

+	Vnull,

 };

 typedef struct Conf Conf;

--- a/sys/src/cmd/ip/ipconfig/main.c

+++ b/sys/src/cmd/ip/ipconfig/main.c

@@ -182,6 +182,7 @@

 		[Vtorus]	"torus",

 		[Vtree]		"tree",

 		[Vpkt]		"pkt",

+		[Vnull]		"null",

 	};

 	int i;

@@ -226,6 +227,7 @@

 		case Vppp:

 		case Vtorus:

 		case Vtree:

+		case Vnull:

 			conf.type = *argv++;

 			argc--;

 			if(argc > 0){

@@ -236,8 +238,11 @@

 			break;

 		}

 	}

-	if(conf.dev == nil)

+	if(conf.dev == nil){

+		if(!isether())

+			sysfatal("no device specified for medium %s", conf.type);

 		conf.dev = finddev(conf.mpoint, "ether", "/net/ether0");

+	}

 	/* get optional verb */

 	if (argc > 0){

@@ -250,6 +255,7 @@

 		case Vtorus:

 		case Vtree:

 		case Vpkt:

+		case Vnull:

 			sysfatal("medium %s already specified", conf.type);

 		case Vadd:

 		case Vdel: