Initial import package net-tools: Basic networking tools

1 files changed, 792 insertions, 0 deletions

diff --git a/arp.c b/arp.c
new file mode 100644
index 0000000..509a804
--- /dev/null
+++ b/arp.c
@@ -0,0 +1,792 @@
+/*
+ * arp                This file contains an implementation of the command
+ *              that maintains the kernel's ARP cache.  It is derived
+ *              from Berkeley UNIX arp(8), but cleaner and with sup-
+ *              port for devices other than Ethernet.
+ *
+ * NET-TOOLS    A collection of programs that form the base set of the
+ *              NET-3 Networking Distribution for the LINUX operating
+ *              system.
+ *
+ * Version:     $Id: arp.c,v 1.20 2001/04/08 17:05:05 pb Exp $
+ *
+ * Maintainer:  Bernd 'eckes' Eckenfels, <net-tools@lina.inka.de>
+ *
+ * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ *
+ * Changes:
+ *              (based on work from Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>)
+ *              Alan Cox        :       modified for NET3
+ *              Andrew Tridgell :       proxy arp netmasks
+ *              Bernd Eckenfels :       -n option
+ *              Bernd Eckenfels :       Use only /proc for display
+ *       {1.60} Bernd Eckenfels :       new arpcode (-i) for 1.3.42 but works 
+ *                                      with 1.2.x, too
+ *       {1.61} Bernd Eckenfels :       more verbose messages
+ *       {1.62} Bernd Eckenfels :       check -t for hw adresses and try to
+ *                                      explain EINVAL (jeff)
+ *970125 {1.63} Bernd Eckenfels :       -a print hardwarename instead of tiltle
+ *970201 {1.64} Bernd Eckenfels :       net-features.h support
+ *970203 {1.65} Bernd Eckenfels :       "#define" in "#if", 
+ *                                      -H|-A additional to -t|-p
+ *970214 {1.66} Bernd Eckenfels :       Fix optarg required for -H and -A
+ *970412 {1.67} Bernd Eckenfels :       device=""; is default
+ *970514 {1.68} Bernd Eckenfels :       -N and -D
+ *970517 {1.69} Bernd Eckenfels :       usage() fixed
+ *970622 {1.70} Bernd Eckenfels :       arp -d priv
+ *970106 {1.80} Bernd Eckenfels :       new syntax without -D and with "dev <If>",
+ *                                      ATF_MAGIC, ATF_DONTPUB support. 
+ *                                      Typo fix (Debian Bug#5728 Giuliano Procida)
+ *970803 {1.81} Bernd Eckenfels :       removed junk comment line 1
+ *970925 {1.82} Bernd Eckenfels :       include fix for libc6
+ *980213 (1.83) Phil Blundell:          set ATF_COM on new entries
+ *980629 (1.84) Arnaldo Carvalho de Melo: gettext instead of catgets
+ *990101 {1.85} Bernd Eckenfels		fixed usage and return codes
+ *990105 (1.86) Phil Blundell:		don't ignore EINVAL in arp_set
+ *991121 (1.87) Bernd Eckenfels:	yes --device has a mandatory arg
+ *010404 (1.88) Arnaldo Carvalho de Melo: use setlocale
+ *
+ *              This program is free software; you can redistribute it
+ *              and/or  modify it under  the terms of  the GNU General
+ *              Public  License as  published  by  the  Free  Software
+ *              Foundation;  either  version 2 of the License, or  (at
+ *              your option) any later version.
+ */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+/* #include <linux/netdevice.h> */
+/* #include <linux/if_arp.h>    */
+#include <net/if_arp.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include "net-support.h"
+#include "pathnames.h"
+#include "version.h"
+#include "config.h"
+#include "intl.h"
+#include "util.h"
+
+#define DFLT_AF	"inet"
+#define DFLT_HW	"ether"
+
+#define FEATURE_ARP
+#include "lib/net-features.h"
+
+char *Release = RELEASE, *Version = "arp 1.88 (2001-04-04)";
+
+int opt_n = 0;			/* do not resolve addresses     */
+int opt_N = 0;			/* use symbolic names           */
+int opt_v = 0;			/* debugging output flag        */
+int opt_D = 0;			/* HW-address is devicename     */
+int opt_e = 0;			/* 0=BSD output, 1=new linux    */
+int opt_a = 0;			/* all entries, substring match */
+struct aftype *ap;		/* current address family       */
+struct hwtype *hw;		/* current hardware type        */
+int sockfd = 0;			/* active socket descriptor     */
+int hw_set = 0;			/* flag if hw-type was set (-H) */
+char device[16] = "";		/* current device               */
+static void usage(void);
+
+/* Delete an entry from the ARP cache. */
+static int arp_del(char **args)
+{
+    char host[128];
+    struct arpreq req;
+    struct sockaddr sa;
+    int flags = 0;
+    int err;
+
+    memset((char *) &req, 0, sizeof(req));
+
+    /* Resolve the host name. */
+    if (*args == NULL) {
+	fprintf(stderr, _("arp: need host name\n"));
+	return (-1);
+    }
+    safe_strncpy(host, *args, (sizeof host));
+    if (ap->input(0, host, &sa) < 0) {
+	ap->herror(host);
+	return (-1);
+    }
+    /* If a host has more than one address, use the correct one! */
+    memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr));
+
+    if (hw_set)
+	req.arp_ha.sa_family = hw->type;
+
+    req.arp_flags = ATF_PERM;
+    args++;
+    while (*args != NULL) {
+	if (opt_v)
+	    fprintf(stderr, "args=%s\n", *args);
+	if (!strcmp(*args, "pub")) {
+	    flags |= 1;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "priv")) {
+	    flags |= 2;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "temp")) {
+	    req.arp_flags &= ~ATF_PERM;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "trail")) {
+	    req.arp_flags |= ATF_USETRAILERS;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "dontpub")) {
+#ifdef HAVE_ATF_DONTPUB
+	    req.arp_flags |= ATF_DONTPUB;
+#else
+	    ENOSUPP("arp", "ATF_DONTPUB");
+#endif
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "auto")) {
+#ifdef HAVE_ATF_MAGIC
+	    req.arp_flags |= ATF_MAGIC;
+#else
+	    ENOSUPP("arp", "ATF_MAGIC");
+#endif
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "dev")) {
+	    if (*++args == NULL)
+		usage();
+	    safe_strncpy(device, *args, sizeof(device));
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "netmask")) {
+	    if (*++args == NULL)
+		usage();
+	    if (strcmp(*args, "255.255.255.255") != 0) {
+		strcpy(host, *args);
+		if (ap->input(0, host, &sa) < 0) {
+		    ap->herror(host);
+		    return (-1);
+		}
+		memcpy((char *) &req.arp_netmask, (char *) &sa,
+		       sizeof(struct sockaddr));
+		req.arp_flags |= ATF_NETMASK;
+	    }
+	    args++;
+	    continue;
+	}
+	usage();
+    }
+    if (flags == 0)
+	flags = 3;
+
+    strcpy(req.arp_dev, device);
+
+    err = -1;
+
+    /* Call the kernel. */
+    if (flags & 2) {
+	if (opt_v)
+	    fprintf(stderr, "arp: SIOCDARP(nopub)\n");
+	if ((err = ioctl(sockfd, SIOCDARP, &req) < 0)) {
+	    if (errno == ENXIO) {
+		if (flags & 1)
+		    goto nopub;
+		printf(_("No ARP entry for %s\n"), host);
+		return (-1);
+	    }
+	    perror("SIOCDARP(priv)");
+	    return (-1);
+	}
+    }
+    if ((flags & 1) && (err)) {
+      nopub:
+	req.arp_flags |= ATF_PUBL;
+	if (opt_v)
+	    fprintf(stderr, "arp: SIOCDARP(pub)\n");
+	if (ioctl(sockfd, SIOCDARP, &req) < 0) {
+	    if (errno == ENXIO) {
+		printf(_("No ARP entry for %s\n"), host);
+		return (-1);
+	    }
+	    perror("SIOCDARP(pub)");
+	    return (-1);
+	}
+    }
+    return (0);
+}
+
+/* Get the hardware address to a specified interface name */
+static int arp_getdevhw(char *ifname, struct sockaddr *sa, struct hwtype *hw)
+{
+    struct ifreq ifr;
+    struct hwtype *xhw;
+
+    strcpy(ifr.ifr_name, ifname);
+    if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0) {
+	fprintf(stderr, _("arp: cant get HW-Address for `%s': %s.\n"), ifname, strerror(errno));
+	return (-1);
+    }
+    if (hw && (ifr.ifr_hwaddr.sa_family != hw->type)) {
+	fprintf(stderr, _("arp: protocol type mismatch.\n"));
+	return (-1);
+    }
+    memcpy((char *) sa, (char *) &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
+
+    if (opt_v) {
+	if (!(xhw = get_hwntype(ifr.ifr_hwaddr.sa_family)) || (xhw->print == 0)) {
+	    xhw = get_hwntype(-1);
+	}
+	fprintf(stderr, _("arp: device `%s' has HW address %s `%s'.\n"), ifname, xhw->name, xhw->print((char *)&ifr.ifr_hwaddr.sa_data));
+    }
+    return (0);
+}
+
+/* Set an entry in the ARP cache. */
+static int arp_set(char **args)
+{
+    char host[128];
+    struct arpreq req;
+    struct sockaddr sa;
+    int flags;
+
+    memset((char *) &req, 0, sizeof(req));
+
+    /* Resolve the host name. */
+    if (*args == NULL) {
+	fprintf(stderr, _("arp: need host name\n"));
+	return (-1);
+    }
+    safe_strncpy(host, *args++, (sizeof host));
+    if (ap->input(0, host, &sa) < 0) {
+	ap->herror(host);
+	return (-1);
+    }
+    /* If a host has more than one address, use the correct one! */
+    memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr));
+
+    /* Fetch the hardware address. */
+    if (*args == NULL) {
+	fprintf(stderr, _("arp: need hardware address\n"));
+	return (-1);
+    }
+    if (opt_D) {
+	if (arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL) < 0)
+	    return (-1);
+    } else {
+	if (hw->input(*args++, &req.arp_ha) < 0) {
+	    fprintf(stderr, _("arp: invalid hardware address\n"));
+	    return (-1);
+	}
+    }
+
+    /* Check out any modifiers. */
+    flags = ATF_PERM | ATF_COM;
+    while (*args != NULL) {
+	if (!strcmp(*args, "temp")) {
+	    flags &= ~ATF_PERM;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "pub")) {
+	    flags |= ATF_PUBL;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "priv")) {
+	    flags &= ~ATF_PUBL;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "trail")) {
+	    flags |= ATF_USETRAILERS;
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "dontpub")) {
+#ifdef HAVE_ATF_DONTPUB
+	    flags |= ATF_DONTPUB;
+#else
+	    ENOSUPP("arp", "ATF_DONTPUB");
+#endif
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "auto")) {
+#ifdef HAVE_ATF_MAGIC
+	    flags |= ATF_MAGIC;
+#else
+	    ENOSUPP("arp", "ATF_MAGIC");
+#endif
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "dev")) {
+	    if (*++args == NULL)
+		usage();
+	    safe_strncpy(device, *args, sizeof(device));
+	    args++;
+	    continue;
+	}
+	if (!strcmp(*args, "netmask")) {
+	    if (*++args == NULL)
+		usage();
+	    if (strcmp(*args, "255.255.255.255") != 0) {
+		strcpy(host, *args);
+		if (ap->input(0, host, &sa) < 0) {
+		    ap->herror(host);
+		    return (-1);
+		}
+		memcpy((char *) &req.arp_netmask, (char *) &sa,
+		       sizeof(struct sockaddr));
+		flags |= ATF_NETMASK;
+	    }
+	    args++;
+	    continue;
+	}
+	usage();
+    }
+
+    /* Fill in the remainder of the request. */
+    req.arp_flags = flags;
+
+    strcpy(req.arp_dev, device);
+
+    /* Call the kernel. */
+    if (opt_v)
+	fprintf(stderr, "arp: SIOCSARP()\n");
+    if (ioctl(sockfd, SIOCSARP, &req) < 0) {
+        perror("SIOCSARP");
+	return (-1);
+    }
+    return (0);
+}
+
+
+/* Process an EtherFile */
+static int arp_file(char *name)
+{
+    char buff[1024];
+    char *sp, *args[32];
+    int linenr, argc;
+    FILE *fp;
+
+    if ((fp = fopen(name, "r")) == NULL) {
+	fprintf(stderr, _("arp: cannot open etherfile %s !\n"), name);
+	return (-1);
+    }
+    /* Read the lines in the file. */
+    linenr = 0;
+    while (fgets(buff, sizeof(buff), fp) != (char *) NULL) {
+	linenr++;
+	if (opt_v == 1)
+	    fprintf(stderr, ">> %s", buff);
+	if ((sp = strchr(buff, '\n')) != (char *) NULL)
+	    *sp = '\0';
+	if (buff[0] == '#' || buff[0] == '\0')
+	    continue;
+
+	argc = getargs(buff, args);
+	if (argc < 2) {
+	    fprintf(stderr, _("arp: format error on line %u of etherfile %s !\n"),
+		    linenr, name);
+	    continue;
+	}
+	if (strchr (args[0], ':') != NULL) {
+	    /* We have a correct ethers file, switch hw adress and hostname
+	       for arp */
+	    char *cp;
+	    cp = args[1];
+	    args[1] = args[0];
+	    args[0] = cp;
+	}
+	if (arp_set(args) != 0)
+	    fprintf(stderr, _("arp: cannot set entry on line %u of etherfile %s !\n"),
+		    linenr, name);
+    }
+
+    (void) fclose(fp);
+    return (0);
+}
+
+
+/* Print the contents of an ARP request block. */
+static void arp_disp_2(char *name, int type, int arp_flags, char *hwa, char *mask, char *dev)
+{
+    static int title = 0;
+    struct hwtype *xhw;
+    char flags[10];
+
+    xhw = get_hwntype(type);
+    if (xhw == NULL)
+	xhw = get_hwtype(DFLT_HW);
+
+    if (title++ == 0) {
+	printf(_("Address                  HWtype  HWaddress           Flags Mask            Iface\n"));
+    }
+    /* Setup the flags. */
+    flags[0] = '\0';
+    if (arp_flags & ATF_COM)
+	strcat(flags, "C");
+    if (arp_flags & ATF_PERM)
+	strcat(flags, "M");
+    if (arp_flags & ATF_PUBL)
+	strcat(flags, "P");
+#ifdef HAVE_ATF_MAGIC
+    if (arp_flags & ATF_MAGIC)
+	strcat(flags, "A");
+#endif
+#ifdef HAVE_ATF_DONTPUB
+    if (arp_flags & ATF_DONTPUB)
+	strcat(flags, "!");
+#endif
+    if (arp_flags & ATF_USETRAILERS)
+	strcat(flags, "T");
+
+    if (!(arp_flags & ATF_NETMASK))
+	mask = "";
+
+    printf("%-23.23s  ", name);
+
+    if (!(arp_flags & ATF_COM)) {
+	if (arp_flags & ATF_PUBL)
+	    printf("%-8.8s%-20.20s", "*", "*");
+	else
+	    printf("%-8.8s%-20.20s", "", _("(incomplete)"));
+    } else {
+	printf("%-8.8s%-20.20s", xhw->name, hwa);
+    }
+
+    printf("%-6.6s%-15.15s %s\n", flags, mask, dev);
+}
+
+/* Print the contents of an ARP request block. */
+static void arp_disp(char *name, char *ip, int type, int arp_flags, char *hwa, char *mask, char *dev)
+{
+    struct hwtype *xhw;
+
+    xhw = get_hwntype(type);
+    if (xhw == NULL)
+	xhw = get_hwtype(DFLT_HW);
+
+    printf(_("%s (%s) at "), name, ip);
+
+    if (!(arp_flags & ATF_COM)) {
+	if (arp_flags & ATF_PUBL)
+	    printf("* ");
+	else
+	    printf(_("<incomplete> "));
+    } else {
+	printf("%s [%s] ", hwa, xhw->name);
+    }
+
+    if (arp_flags & ATF_NETMASK)
+	printf(_("netmask %s "), mask);
+
+    if (arp_flags & ATF_PERM)
+	printf("PERM ");
+    if (arp_flags & ATF_PUBL)
+	printf("PUP ");
+#ifdef HAVE_ATF_MAGIC
+    if (arp_flags & ATF_MAGIC)
+	printf("AUTO ");
+#endif
+#ifdef HAVE_ATF_DONTPUB
+    if (arp_flags & ATF_DONTPUB)
+	printf("DONTPUB ");
+#endif
+    if (arp_flags & ATF_USETRAILERS)
+	printf("TRAIL ");
+
+    printf(_("on %s\n"), dev);
+}
+
+
+/* Display the contents of the ARP cache in the kernel. */
+static int arp_show(char *name)
+{
+    char host[100];
+    struct sockaddr sa;
+    char ip[100];
+    char hwa[100];
+    char mask[100];
+    char line[200];
+    char dev[100];
+    int type, flags;
+    FILE *fp;
+    char *hostname;
+    int num, entries = 0, showed = 0;
+
+    host[0] = '\0';
+
+    if (name != NULL) {
+	/* Resolve the host name. */
+	safe_strncpy(host, name, (sizeof host));
+	if (ap->input(0, host, &sa) < 0) {
+	    ap->herror(host);
+	    return (-1);
+	}
+	safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host));
+    }
+    /* Open the PROCps kernel table. */
+    if ((fp = fopen(_PATH_PROCNET_ARP, "r")) == NULL) {
+	perror(_PATH_PROCNET_ARP);
+	return (-1);
+    }
+    /* Bypass header -- read until newline */
+    if (fgets(line, sizeof(line), fp) != (char *) NULL) {
+	strcpy(mask, "-");
+	strcpy(dev, "-");
+	/* Read the ARP cache entries. */
+	for (; fgets(line, sizeof(line), fp);) {
+	    num = sscanf(line, "%s 0x%x 0x%x %100s %100s %100s\n",
+			 ip, &type, &flags, hwa, mask, dev);
+	    if (num < 4)
+		break;
+
+	    entries++;
+	    /* if the user specified hw-type differs, skip it */
+	    if (hw_set && (type != hw->type))
+		continue;
+
+	    /* if the user specified address differs, skip it */
+	    if (host[0] && strcmp(ip, host))
+		continue;
+
+	    /* if the user specified device differs, skip it */
+	    if (device[0] && strcmp(dev, device))
+		continue;
+
+	    showed++;
+	    /* This IS ugly but it works -be */
+	    if (opt_n)
+		hostname = "?";
+	    else {
+		if (ap->input(0, ip, &sa) < 0)
+		    hostname = ip;
+		else
+		    hostname = ap->sprint(&sa, opt_n | 0x8000);
+		if (strcmp(hostname, ip) == 0)
+		    hostname = "?";
+	    }
+
+	    if (opt_e)
+		arp_disp_2(hostname[0] == '?' ? ip : hostname, type, flags, hwa, mask, dev);
+	    else
+		arp_disp(hostname, ip, type, flags, hwa, mask, dev);
+	}
+    }
+    if (opt_v)
+	printf(_("Entries: %d\tSkipped: %d\tFound: %d\n"), entries, entries - showed, showed);
+
+    if (!showed) {
+	if (host[0] && !opt_a)
+	    printf(_("%s (%s) -- no entry\n"), name, host);
+	else if (hw_set || host[0] || device[0]) {
+	    printf(_("arp: in %d entries no match found.\n"), entries);
+	}
+    }
+    (void) fclose(fp);
+    return (0);
+}
+
+static void version(void)
+{
+    fprintf(stderr, "%s\n%s\n%s\n", Release, Version, Features);
+    exit(E_VERSION);
+}
+
+static void usage(void)
+{
+    fprintf(stderr, _("Usage:\n  arp [-vn]  [<HW>] [-i <if>] [-a] [<hostname>]             <-Display ARP cache\n"));
+    fprintf(stderr, _("  arp [-v]          [-i <if>] -d  <hostname> [pub][nopub]    <-Delete ARP entry\n"));
+    fprintf(stderr, _("  arp [-vnD] [<HW>] [-i <if>] -f  [<filename>]              <-Add entry from file\n"));
+    fprintf(stderr, _("  arp [-v]   [<HW>] [-i <if>] -s  <hostname> <hwaddr> [temp][nopub] <-Add entry\n"));
+    fprintf(stderr, _("  arp [-v]   [<HW>] [-i <if>] -s  <hostname> <hwaddr> [netmask <nm>] pub  <-''-\n"));
+    fprintf(stderr, _("  arp [-v]   [<HW>] [-i <if>] -Ds <hostname> <if> [netmask <nm>] pub      <-''-\n\n"));
+    
+    fprintf(stderr, _("        -a                       display (all) hosts in alternative (BSD) style\n"));
+    fprintf(stderr, _("        -s, --set                set a new ARP entry\n"));
+    fprintf(stderr, _("        -d, --delete             delete a specified entry\n"));
+    fprintf(stderr, _("        -v, --verbose            be verbose\n"));
+    fprintf(stderr, _("        -n, --numeric            don't resolve names\n"));
+    fprintf(stderr, _("        -i, --device             specify network interface (e.g. eth0)\n"));
+    fprintf(stderr, _("        -D, --use-device         read <hwaddr> from given device\n"));
+    fprintf(stderr, _("        -A, -p, --protocol       specify protocol family\n"));
+    fprintf(stderr, _("        -f, --file               read new entries from file or from /etc/ethers\n\n"));
+
+    fprintf(stderr, _("  <HW>=Use '-H <hw>' to specify hardware address type. Default: %s\n"), DFLT_HW);
+    fprintf(stderr, _("  List of possible hardware types (which support ARP):\n"));
+    print_hwlist(1); /* 1 = ARPable */
+    exit(E_USAGE);
+}
+
+int main(int argc, char **argv)
+{
+    int i, lop, what;
+    struct option longopts[] =
+    {
+	{"verbose", 0, 0, 'v'},
+	{"version", 0, 0, 'V'},
+	{"all", 0, 0, 'a'},
+	{"delete", 0, 0, 'd'},
+	{"file", 0, 0, 'f'},
+	{"numeric", 0, 0, 'n'},
+	{"set", 0, 0, 's'},
+	{"protocol", 1, 0, 'A'},
+	{"hw-type", 1, 0, 'H'},
+	{"device", 1, 0, 'i'},
+	{"help", 0, 0, 'h'},
+	{"use-device", 0, 0, 'D'},
+	{"symbolic", 0, 0, 'N'},
+	{NULL, 0, 0, 0}
+    };
+
+#if I18N
+    setlocale (LC_ALL, "");
+    bindtextdomain("net-tools", "/usr/share/locale");
+    textdomain("net-tools");
+#endif
+
+    /* Initialize variables... */
+    if ((hw = get_hwtype(DFLT_HW)) == NULL) {
+	fprintf(stderr, _("%s: hardware type not supported!\n"), DFLT_HW);
+	return (-1);
+    }
+    if ((ap = get_aftype(DFLT_AF)) == NULL) {
+	fprintf(stderr, _("%s: address family not supported!\n"), DFLT_AF);
+	return (-1);
+    }
+    what = 0;
+
+    /* Fetch the command-line arguments. */
+    /* opterr = 0; */
+    while ((i = getopt_long(argc, argv, "A:H:adfp:nsei:t:vh?DNV", longopts, &lop)) != EOF)
+	switch (i) {
+	case 'a':
+	    what = 1;
+	    opt_a = 1;
+	    break;
+	case 'f':
+	    what = 2;
+	    break;
+	case 'd':
+	    what = 3;
+	    break;
+	case 's':
+	    what = 4;
+	    break;
+
+
+	case 'e':
+	    opt_e = 1;
+	    break;
+	case 'n':
+	    opt_n = FLAG_NUM;
+	    break;
+	case 'D':
+	    opt_D = 1;
+	    break;
+	case 'N':
+	    opt_N = FLAG_SYM;
+	    fprintf(stderr, _("arp: -N not yet supported.\n"));
+	    break;
+	case 'v':
+	    opt_v = 1;
+	    break;
+
+	case 'A':
+	case 'p':
+	    ap = get_aftype(optarg);
+	    if (ap == NULL) {
+		fprintf(stderr, _("arp: %s: unknown address family.\n"),
+			optarg);
+		exit(-1);
+	    }
+	    break;
+	case 'H':
+	case 't':
+	    hw = get_hwtype(optarg);
+	    if (hw == NULL) {
+		fprintf(stderr, _("arp: %s: unknown hardware type.\n"),
+			optarg);
+		exit(-1);
+	    }
+	    hw_set = 1;
+	    break;
+	case 'i':
+	    safe_strncpy(device, optarg, sizeof(device));
+	    break;
+
+	case 'V':
+	    version();
+	case '?':
+	case 'h':
+	default:
+	    usage();
+	}
+
+    if (ap->af != AF_INET) {
+	fprintf(stderr, _("arp: %s: kernel only supports 'inet'.\n"),
+		ap->name);
+	exit(-1);
+    }
+
+    /* If not hw type specified get default */
+    if(hw_set==0)
+	if ((hw = get_hwtype(DFLT_HW)) == NULL) {
+	  fprintf(stderr, _("%s: hardware type not supported!\n"), DFLT_HW);
+	  return (-1);
+	}
+
+    if (hw->alen <= 0) {
+	fprintf(stderr, _("arp: %s: hardware type without ARP support.\n"),
+		hw->name);
+	exit(-1);
+    }
+    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+	perror("socket");
+	exit(-1);
+    }
+    /* Now see what we have to do here... */
+    switch (what) {
+    case 0:
+	opt_e = 1;
+	what = arp_show(argv[optind]);
+	break;
+
+    case 1:			/* show an ARP entry in the cache */
+	what = arp_show(argv[optind]);
+	break;
+
+    case 2:			/* process an EtherFile */
+	what = arp_file(argv[optind] ? argv[optind] : "/etc/ethers");
+	break;
+
+    case 3:			/* delete an ARP entry from the cache */
+	what = arp_del(&argv[optind]);
+	break;
+
+    case 4:			/* set an ARP entry in the cache */
+	what = arp_set(&argv[optind]);
+	break;
+
+    default:
+	usage();
+    }
+
+    exit(what);
+}