From: Wankle Rotary Engine <wpaul@skynet.ctr.columbia.edu>

- The -a flag now works just as it does in SunOS: '-a' is actually
  handled like a wildcard for all interfaces. 'ifconfig -a' displays
  the status of all interfaces, 'ifconfig -a netmask 0xffffff00' sets
  the netmask of all interfaces, and so forth. I don't know if many
  people really need to be able to set the netmasks of all interfaces
  at once, but the SunOS ifconfig seems to allow this, so there you
  have it.

- An 'ether_status' function has been added to display the ethernet
  address of all ethernet interfaces. Again, as in SunOS, you must
  be root in order for this to work. The ethernet address is read
  from /dev/kmem using kvm_open() and kvm_read(), much in the same
  was as it's done with netstat. If you choose to install ifconfig
  set-gid kmem then normal users will be able to see the ethernet
  address as well, though this may not be desireable. This feature
  requires a small change to the ifconfig Makefile: you need to link
  with -lkvm in order to use the kvm_*() functions.

Submitted by:	wpaul

sbin/ifconfig/Makefile

@@ -2,5 +2,7 @@
 
 PROG=	ifconfig
 MAN8=	ifconfig.8
+LDADD=  -lkvm
+DPADD=  ${LIBKVM}
 
 .include <bsd.prog.mk>

sbin/ifconfig/ifconfig.c

@@ -46,7 +46,9 @@ static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
 #include <sys/ioctl.h>
 
 #include <net/if.h>
+#include <net/if_dl.h>
 #include <netinet/in.h>
+#include <netinet/in_var.h>
 #include <arpa/inet.h>
 
 #define	NSIP
@@ -66,6 +68,9 @@ static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <nlist.h> 
+#include <kvm.h>   
+#include <fcntl.h>
 
 struct	ifreq		ifr, ridreq;
 struct	ifaliasreq	addreq;
@@ -84,6 +89,7 @@ int	doalias;
 int	clearaddr;
 int	newaddr = 1;
 int	s;
+kvm_t	*kvmd;
 extern	int errno;
 
 int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
@@ -140,6 +146,7 @@ struct	cmd {
 int	in_status(), in_getaddr();
 int	xns_status(), xns_getaddr();
 int	iso_status(), iso_getaddr();
+int	ether_status();
 
 /* Known address families */
 struct afswtch {
@@ -159,6 +166,7 @@ struct afswtch {
 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
 	{ "iso", AF_ISO, iso_status, iso_getaddr,
 	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
+	{ "ether", AF_INET, ether_status, NULL },
 	{ 0,	0,	    0,		0 }
 };
 
@@ -199,6 +207,53 @@ main(argc, argv)
 		perror("ifconfig: socket");
 		exit(1);
 	}
+	if (!strcmp(name, "-a")) {
+		struct ifconf ifc;
+#define MAX_INTERFACES 50	/* Yeah right. */
+		char buffer[MAX_INTERFACES * sizeof(struct ifreq)];
+		struct ifreq *ifptr, *end;
+		int ifflags;
+
+		ifc.ifc_len = sizeof(buffer);
+		ifc.ifc_buf = buffer;
+		if (ioctl(s, SIOCGIFCONF, (char *) &ifc) < 0) {
+			perror("ifconfig (SIOCGIFCONF)");
+			exit (1);
+		}
+		ifflags = ifc.ifc_req->ifr_flags;
+		end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
+		ifptr = ifc.ifc_req;
+		while (ifptr < end) {
+			sprintf(ifr.ifr_name,"%s",ifptr->ifr_name);
+			sprintf(name,"%s",ifptr->ifr_name);
+			close(s);
+			s = socket(af, SOCK_DGRAM, 0);
+			if (s < 0) {
+				perror("ifconfig: socket");
+				exit(1);
+			}
+			if (ifptr->ifr_flags == ifflags)
+				ifconfig(argc,argv,af,rafp);
+			if(ifptr->ifr_addr.sa_len)	/* Dohw! */
+				ifptr = (struct ifreq *) ((caddr_t) ifptr +
+				ifptr->ifr_addr.sa_len -
+				sizeof(struct sockaddr));
+			ifptr++;
+		}
+	} else
+		ifconfig(argc,argv,af,rafp);
+
+	exit (0);
+}
+
+
+
+ifconfig(argc,argv,af,rafp)
+	int argc;
+	char *argv[];
+	int af;
+	struct afswtch *rafp;
+{
 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 		Perror("ioctl (SIOCGIFFLAGS)");
 		exit(1);
@@ -213,9 +268,9 @@ main(argc, argv)
 		perror("ioctl (SIOCGIFMTU)");
 	else
 		mtu = ifr.ifr_mtu;
-	if (argc == 0) {
+	if (argc == 0) {	
 		status();
-		exit(0);
+		return(0);
 	}
 	while (argc > 0) {
 		register struct cmd *p;
@@ -264,7 +319,7 @@ main(argc, argv)
 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
 			Perror("ioctl (SIOCAIFADDR)");
 	}
-	exit(0);
+	return(0);
 }
 #define RIDADDR 0
 #define ADDR	1
@@ -553,6 +608,90 @@ iso_status(force)
 	putchar('\n');
 }
 
+kread(addr, buf, size)
+        u_long addr;
+        char *buf;
+        int size;
+{
+
+        if (kvm_read(kvmd, addr, buf, size) != size)
+                return (-1);
+        return (0);
+}
+
+/* Unashamedly stolen from netstat -- maybe someday we can us sysctl() */
+ether_status()
+{
+	struct nlist nl[] = { { "_ifnet" } , "" };
+	u_long addr, addr2;
+	struct ifnet ifnet;
+	union {
+		struct ifaddr ifa;
+		struct in_ifaddr in;
+		struct ns_ifaddr ns;
+		struct iso_ifaddr iso;
+	} ifaddr;
+	char *cp;
+	struct sockaddr *sa;
+	struct sockaddr_dl *sdl;
+	int n,m;
+	char ifacename[IFNAMSIZ];
+
+	/*
+	 * If we fail here it probably means we don't have permission to
+	 * read /dev/kmem. Best to just silently bail out. If we have
+	 * an error *after* we succeed in opening /dev/kmem, then we
+	 * should report it.
+	 */
+	if ((kvmd = kvm_open(NULL,NULL,NULL,O_RDONLY,NULL)) == NULL)
+		return;
+	if (kvm_nlist(kvmd, nl) < 0 || nl[0].n_type == 0) {
+		perror("ifconfig: kvm_nlist()");
+		return;
+	}
+	if (kread(nl[0].n_value, (char *)&addr, sizeof(addr))) {
+		perror("_ifnet");
+		return;
+	}
+	addr2 = 0;
+	while (addr || addr2) {
+		if (addr2 == 0) {
+                        if (kread(addr, (char *)&ifnet, sizeof ifnet) ||
+                           kread((u_long)ifnet.if_name, ifacename, IFNAMSIZ)){
+					perror("ifconfig: kvm_read()");
+					return;
+			}
+			addr = (u_long)ifnet.if_next;
+			addr2 = (u_long)ifnet.if_addrlist;
+		}
+		if (kread(addr2, (char *)&ifaddr, sizeof ifaddr)) {
+			addr2 = 0;
+                        continue;
+                }
+		sprintf(ifacename,"%s%d",ifacename, ifnet.if_unit);
+		if (!strncmp(name, ifacename, strlen(name))) {
+#define CP(x) ((char *)(x))
+			cp = (CP(ifaddr.ifa.ifa_addr) - CP(addr2)) +
+				CP(&ifaddr); sa = (struct sockaddr *)cp;
+			if (sa->sa_family == AF_LINK) {
+				sdl = (struct sockaddr_dl *)sa;
+				cp = (char *)LLADDR(sdl);
+				if ((n = sdl->sdl_alen) > 0) {
+					printf ("\tether ");
+                               		while (--n >= 0)
+						m += printf("%02x%c",
+							*cp++ & 0xff,
+							n > 0 ? ':' : ' ');
+					putchar('\n');	
+				}
+				break;
+			}
+		}
+		addr2 = (u_long)ifaddr.ifa.ifa_next;
+	}
+	kvm_close(kvmd);
+}
+	
 Perror(cmd)
 	char *cmd;
 {