1 files changed, 92 insertions, 0 deletions
diff --git a/usr.sbin/ipsend/44arp.c b/usr.sbin/ipsend/44arp.c
new file mode 100644
index 00000000000..04afb619f24
--- /dev/null
+++ b/usr.sbin/ipsend/44arp.c
@@ -0,0 +1,92 @@
+/*
+ * Based upon 4.4BSD's /usr/sbin/arp
+ */
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <errno.h>
+#include <nlist.h>
+#include <stdio.h>
+
+/*
+ * lookup host and return
+ * its IP address in address
+ * (4 bytes)
+ */
+int	resolve(host, address) 
+char	*host, *address;
+{
+        struct	hostent	*hp;
+        u_long	add;
+
+	add = inet_addr(host);
+	if (add == -1)
+	    {
+		if (!(hp = gethostbyname(host)))
+		    {
+			fprintf(stderr, "unknown host: %s\n", host);
+			return -1;
+		    }
+		bcopy((char *)hp->h_addr, (char *)address, 4);
+		return 0;
+	}
+	bcopy((char*)&add, address, 4);
+	return 0;
+}
+
+
+int	arp(addr, eaddr)
+char	*addr, *eaddr;
+{
+	int	mib[6];
+	size_t	needed;
+	char	*host, *malloc(), *lim, *buf, *next;
+	struct	rt_msghdr	*rtm;
+	struct	sockaddr_inarp	*sin;
+	struct	sockaddr_dl	*sdl;
+
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET;
+	mib[4] = NET_RT_FLAGS;
+	mib[5] = RTF_LLINFO;
+	if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
+	    {
+		perror("route-sysctl-estimate");
+		exit(-1);
+	    }
+	if ((buf = malloc(needed)) == NULL)
+	    {
+		perror("malloc");
+		exit(-1);
+	    }
+	if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
+	    {
+		perror("actual retrieval of routing table");
+		exit(-1);
+	    }
+	lim = buf + needed;
+	for (next = buf; next < lim; next += rtm->rtm_msglen)
+	    {
+		rtm = (struct rt_msghdr *)next;
+		sin = (struct sockaddr_inarp *)(rtm + 1);
+		sdl = (struct sockaddr_dl *)(sin + 1);
+		if (addr && !bcmp(addr, (char *)&sin->sin_addr,
+				  sizeof(struct in_addr)))
+		    {
+			bcopy(LLADDR(sdl), eaddr, sdl->sdl_alen);
+			return 0;
+		    }
+	    }
+	return -1;
+}