Correcting tag name to be like previous ones1_3_0

1 files changed, 1152 insertions, 0 deletions

diff --git a/networking/interface.c b/networking/interface.c
new file mode 100644
index 0000000..dd45582
--- /dev/null
+++ b/networking/interface.c
@@ -0,0 +1,1152 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * stolen from net-tools-1.59 and stripped down for busybox by
+ *			Erik Andersen <andersen@codepoet.org>
+ *
+ * Heavily modified by Manuel Novoa III       Mar 12, 2001
+ *
+ * Added print_bytes_scaled function to reduce code size.
+ * Added some (potentially) missing defines.
+ * Improved display support for -a and for a named interface.
+ *
+ * -----------------------------------------------------------
+ *
+ * ifconfig   This file contains an implementation of the command
+ *              that either displays or sets the characteristics of
+ *              one or more of the system's networking interfaces.
+ *
+ * Version:     $Id: interface.c,v 1.25 2004/08/26 21:45:21 andersen Exp $
+ *
+ * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ *              and others.  Copyright 1993 MicroWalt Corporation
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ * Patched to support 'add' and 'del' keywords for INET(4) addresses
+ * by Mrs. Brisby <mrs.brisby@nimh.org>
+ *
+ * {1.34} - 19980630 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *                     - gettext instead of catgets for i18n
+ *          10/1998  - Andi Kleen. Use interface list primitives.
+ *	    20001008 - Bernd Eckenfels, Patch from RH for setting mtu
+ *			(default AF was wrong)
+ */
+
+#include "inet_common.h"
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include "busybox.h"
+
+#ifdef CONFIG_FEATURE_IPV6
+# define HAVE_AFINET6 1
+#else
+# undef HAVE_AFINET6
+#endif
+
+#define _PATH_PROCNET_DEV               "/proc/net/dev"
+#define _PATH_PROCNET_IFINET6           "/proc/net/if_inet6"
+
+#ifdef HAVE_AFINET6
+
+#ifndef _LINUX_IN6_H
+/*
+ *    This is in linux/include/net/ipv6.h.
+ */
+
+struct in6_ifreq {
+	struct in6_addr ifr6_addr;
+	uint32_t ifr6_prefixlen;
+	unsigned int ifr6_ifindex;
+};
+
+#endif
+
+#endif /* HAVE_AFINET6 */
+
+/* Defines for glibc2.0 users. */
+#ifndef SIOCSIFTXQLEN
+#define SIOCSIFTXQLEN      0x8943
+#define SIOCGIFTXQLEN      0x8942
+#endif
+
+/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
+#ifndef ifr_qlen
+#define ifr_qlen        ifr_ifru.ifru_mtu
+#endif
+
+#ifndef HAVE_TXQUEUELEN
+#define HAVE_TXQUEUELEN 1
+#endif
+
+#ifndef IFF_DYNAMIC
+#define IFF_DYNAMIC     0x8000	/* dialup device with changing addresses */
+#endif
+
+/* This structure defines protocol families and their handlers. */
+struct aftype {
+	const char *name;
+	const char *title;
+	int af;
+	int alen;
+	char *(*print) (unsigned char *);
+	char *(*sprint) (struct sockaddr *, int numeric);
+	int (*input) (int type, char *bufp, struct sockaddr *);
+	void (*herror) (char *text);
+	int (*rprint) (int options);
+	int (*rinput) (int typ, int ext, char **argv);
+
+	/* may modify src */
+	int (*getmask) (char *src, struct sockaddr * mask, char *name);
+
+	int fd;
+	char *flag_file;
+};
+
+/* Display an Internet socket address. */
+static char *INET_sprint(struct sockaddr *sap, int numeric)
+{
+	static char buff[128];
+
+	if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
+		return safe_strncpy(buff, "[NONE SET]", sizeof(buff));
+
+	if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap,
+					  numeric, 0xffffff00) != 0)
+		return NULL;
+
+	return buff;
+}
+
+static struct aftype inet_aftype = {
+	.name =		"inet",
+	.title =	"DARPA Internet",
+	.af =		AF_INET,
+	.alen =		4,
+	.sprint =	INET_sprint,
+	.fd =		-1
+};
+
+#ifdef HAVE_AFINET6
+
+/* Display an Internet socket address. */
+/* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
+static char *INET6_sprint(struct sockaddr *sap, int numeric)
+{
+	static char buff[128];
+
+	if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
+		return safe_strncpy(buff, "[NONE SET]", sizeof(buff));
+	if (INET6_rresolve
+		(buff, sizeof(buff), (struct sockaddr_in6 *) sap, numeric) != 0)
+		return safe_strncpy(buff, "[UNKNOWN]", sizeof(buff));
+	return buff;
+}
+
+static struct aftype inet6_aftype = {
+	.name =		"inet6",
+	.title =	"IPv6",
+	.af =		AF_INET6,
+	.alen =		sizeof(struct in6_addr),
+	.sprint =	INET6_sprint,
+	.fd =		-1
+};
+
+#endif /* HAVE_AFINET6 */
+
+/* Display an UNSPEC address. */
+static char *UNSPEC_print(unsigned char *ptr)
+{
+	static char buff[sizeof(struct sockaddr) * 3 + 1];
+	char *pos;
+	unsigned int i;
+
+	pos = buff;
+	for (i = 0; i < sizeof(struct sockaddr); i++) {
+		/* careful -- not every libc's sprintf returns # bytes written */
+		sprintf(pos, "%02X-", (*ptr++ & 0377));
+		pos += 3;
+	}
+	/* Erase trailing "-".  Works as long as sizeof(struct sockaddr) != 0 */
+	*--pos = '\0';
+	return buff;
+}
+
+/* Display an UNSPEC socket address. */
+static char *UNSPEC_sprint(struct sockaddr *sap, int numeric)
+{
+	static char buf[64];
+
+	if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
+		return safe_strncpy(buf, "[NONE SET]", sizeof(buf));
+	return UNSPEC_print((unsigned char *)sap->sa_data);
+}
+
+static struct aftype unspec_aftype = {
+	"unspec", "UNSPEC", AF_UNSPEC, 0,
+	UNSPEC_print, UNSPEC_sprint, NULL, NULL,
+	NULL,
+};
+
+static struct aftype * const aftypes[] = {
+	&inet_aftype,
+#ifdef HAVE_AFINET6
+	&inet6_aftype,
+#endif
+	&unspec_aftype,
+	NULL
+};
+
+/* Check our protocol family table for this family. */
+static struct aftype *get_afntype(int af)
+{
+	struct aftype * const *afp;
+
+	afp = aftypes;
+	while (*afp != NULL) {
+		if ((*afp)->af == af)
+			return *afp;
+		afp++;
+	}
+	return NULL;
+}
+
+/* Check our protocol family table for this family and return its socket */
+static int get_socket_for_af(int af)
+{
+	struct aftype * const *afp;
+
+	afp = aftypes;
+	while (*afp != NULL) {
+		if ((*afp)->af == af)
+			return (*afp)->fd;
+		afp++;
+	}
+	return -1;
+}
+
+struct user_net_device_stats {
+	unsigned long long rx_packets;	/* total packets received       */
+	unsigned long long tx_packets;	/* total packets transmitted    */
+	unsigned long long rx_bytes;	/* total bytes received         */
+	unsigned long long tx_bytes;	/* total bytes transmitted      */
+	unsigned long rx_errors;	/* bad packets received         */
+	unsigned long tx_errors;	/* packet transmit problems     */
+	unsigned long rx_dropped;	/* no space in linux buffers    */
+	unsigned long tx_dropped;	/* no space available in linux  */
+	unsigned long rx_multicast;	/* multicast packets received   */
+	unsigned long rx_compressed;
+	unsigned long tx_compressed;
+	unsigned long collisions;
+
+	/* detailed rx_errors: */
+	unsigned long rx_length_errors;
+	unsigned long rx_over_errors;	/* receiver ring buff overflow  */
+	unsigned long rx_crc_errors;	/* recved pkt with crc error    */
+	unsigned long rx_frame_errors;	/* recv'd frame alignment error */
+	unsigned long rx_fifo_errors;	/* recv'r fifo overrun          */
+	unsigned long rx_missed_errors;	/* receiver missed packet     */
+	/* detailed tx_errors */
+	unsigned long tx_aborted_errors;
+	unsigned long tx_carrier_errors;
+	unsigned long tx_fifo_errors;
+	unsigned long tx_heartbeat_errors;
+	unsigned long tx_window_errors;
+};
+
+struct interface {
+	struct interface *next, *prev;
+	char name[IFNAMSIZ];	/* interface name        */
+	short type;			/* if type               */
+	short flags;		/* various flags         */
+	int metric;			/* routing metric        */
+	int mtu;			/* MTU value             */
+	int tx_queue_len;	/* transmit queue length */
+	struct ifmap map;	/* hardware setup        */
+	struct sockaddr addr;	/* IP address            */
+	struct sockaddr dstaddr;	/* P-P IP address        */
+	struct sockaddr broadaddr;	/* IP broadcast address  */
+	struct sockaddr netmask;	/* IP network mask       */
+	int has_ip;
+	char hwaddr[32];	/* HW address            */
+	int statistics_valid;
+	struct user_net_device_stats stats;	/* statistics            */
+	int keepalive;		/* keepalive value for SLIP */
+	int outfill;		/* outfill value for SLIP */
+};
+
+
+int interface_opt_a;	/* show all interfaces          */
+
+static struct interface *int_list, *int_last;
+static int skfd = -1;	/* generic raw socket desc.     */
+
+
+static int sockets_open(int family)
+{
+	struct aftype * const *aft;
+	int sfd = -1;
+	static int force = -1;
+
+	if (force < 0) {
+		force = 0;
+		if (get_linux_version_code() < KERNEL_VERSION(2,1,0))
+			force = 1;
+		if (access("/proc/net", R_OK))
+			force = 1;
+	}
+	for (aft = aftypes; *aft; aft++) {
+		struct aftype *af = *aft;
+		int type = SOCK_DGRAM;
+
+		if (af->af == AF_UNSPEC)
+			continue;
+		if (family && family != af->af)
+			continue;
+		if (af->fd != -1) {
+			sfd = af->fd;
+			continue;
+		}
+		/* Check some /proc file first to not stress kmod */
+		if (!family && !force && af->flag_file) {
+			if (access(af->flag_file, R_OK))
+				continue;
+		}
+		af->fd = socket(af->af, type, 0);
+		if (af->fd >= 0)
+			sfd = af->fd;
+	}
+	if (sfd < 0) {
+		bb_error_msg("no usable address families found");
+	}
+	return sfd;
+}
+
+#ifdef CONFIG_FEATURE_CLEAN_UP
+static void sockets_close(void)
+{
+	struct aftype * const *aft;
+	for (aft = aftypes; *aft != NULL; aft++) {
+		struct aftype *af = *aft;
+		if( af->fd != -1 ) {
+			close(af->fd);
+			af->fd = -1;
+		}
+	}
+}
+#endif
+#if 0
+/* like strcmp(), but knows about numbers */
+except that the freshly added calls to xatoul() brf on ethernet aliases with
+uClibc with e.g.: ife->name='lo'  name='eth0:1'
+static int nstrcmp(const char *a, const char *b)
+{
+	const char *a_ptr = a;
+	const char *b_ptr = b;
+
+	while (*a == *b) {
+		if (*a == '\0') {
+			return 0;
+		}
+		if (!isdigit(*a) && isdigit(*(a+1))) {
+			a_ptr = a+1;
+			b_ptr = b+1;
+		}
+		a++;
+		b++;
+	}
+
+	if (isdigit(*a) && isdigit(*b)) {
+		return xatoul(a_ptr) > xatoul(b_ptr) ? 1 : -1;
+	}
+	return *a - *b;
+}
+#endif
+
+static struct interface *add_interface(char *name)
+{
+	struct interface *ife, **nextp, *new;
+
+	for (ife = int_last; ife; ife = ife->prev) {
+		int n = /*n*/strcmp(ife->name, name);
+
+		if (n == 0)
+			return ife;
+		if (n < 0)
+			break;
+	}
+
+	new = xzalloc(sizeof(*new));
+	safe_strncpy(new->name, name, IFNAMSIZ);
+	nextp = ife ? &ife->next : &int_list;
+	new->prev = ife;
+	new->next = *nextp;
+	if (new->next)
+		new->next->prev = new;
+	else
+		int_last = new;
+	*nextp = new;
+	return new;
+}
+
+
+static int if_readconf(void)
+{
+	int numreqs = 30;
+	struct ifconf ifc;
+	struct ifreq *ifr;
+	int n, err = -1;
+	int skfd2;
+
+	/* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
+	   (as of 2.1.128) */
+	skfd2 = get_socket_for_af(AF_INET);
+	if (skfd2 < 0) {
+		bb_perror_msg(("warning: no inet socket available"));
+		/* Try to soldier on with whatever socket we can get hold of.  */
+		skfd2 = sockets_open(0);
+		if (skfd2 < 0)
+			return -1;
+	}
+
+	ifc.ifc_buf = NULL;
+	for (;;) {
+		ifc.ifc_len = sizeof(struct ifreq) * numreqs;
+		ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);
+
+		if (ioctl(skfd2, SIOCGIFCONF, &ifc) < 0) {
+			perror("SIOCGIFCONF");
+			goto out;
+		}
+		if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
+			/* assume it overflowed and try again */
+			numreqs += 10;
+			continue;
+		}
+		break;
+	}
+
+	ifr = ifc.ifc_req;
+	for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
+		add_interface(ifr->ifr_name);
+		ifr++;
+	}
+	err = 0;
+
+  out:
+	free(ifc.ifc_buf);
+	return err;
+}
+
+static char *get_name(char *name, char *p)
+{
+	/* Extract <name> from nul-terminated p where p matches
+	   <name>: after leading whitespace.
+	   If match is not made, set name empty and return unchanged p */
+	int namestart=0, nameend=0;
+	while (isspace(p[namestart]))
+		namestart++;
+	nameend=namestart;
+	while (p[nameend] && p[nameend]!=':' && !isspace(p[nameend]))
+		nameend++;
+	if (p[nameend]==':') {
+		if ((nameend-namestart)<IFNAMSIZ) {
+			memcpy(name,&p[namestart],nameend-namestart);
+			name[nameend-namestart]='\0';
+			p=&p[nameend];
+		} else {
+			/* Interface name too large */
+			name[0]='\0';
+		}
+	} else {
+		/* trailing ':' not found - return empty */
+		name[0]='\0';
+	}
+	return p + 1;
+}
+
+/* If scanf supports size qualifiers for %n conversions, then we can
+ * use a modified fmt that simply stores the position in the fields
+ * having no associated fields in the proc string.  Of course, we need
+ * to zero them again when we're done.  But that is smaller than the
+ * old approach of multiple scanf occurrences with large numbers of
+ * args. */
+
+/* static const char * const ss_fmt[] = { */
+/*	"%lln%llu%lu%lu%lu%lu%ln%ln%lln%llu%lu%lu%lu%lu%lu", */
+/*	"%llu%llu%lu%lu%lu%lu%ln%ln%llu%llu%lu%lu%lu%lu%lu", */
+/*	"%llu%llu%lu%lu%lu%lu%lu%lu%llu%llu%lu%lu%lu%lu%lu%lu" */
+/* }; */
+
+	/* Lie about the size of the int pointed to for %n. */
+#if INT_MAX == LONG_MAX
+static const char * const ss_fmt[] = {
+	"%n%llu%u%u%u%u%n%n%n%llu%u%u%u%u%u",
+	"%llu%llu%u%u%u%u%n%n%llu%llu%u%u%u%u%u",
+	"%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u"
+};
+#else
+static const char * const ss_fmt[] = {
+	"%n%llu%lu%lu%lu%lu%n%n%n%llu%lu%lu%lu%lu%lu",
+	"%llu%llu%lu%lu%lu%lu%n%n%llu%llu%lu%lu%lu%lu%lu",
+	"%llu%llu%lu%lu%lu%lu%lu%lu%llu%llu%lu%lu%lu%lu%lu%lu"
+};
+
+#endif
+
+static void get_dev_fields(char *bp, struct interface *ife, int procnetdev_vsn)
+{
+	memset(&ife->stats, 0, sizeof(struct user_net_device_stats));
+
+	sscanf(bp, ss_fmt[procnetdev_vsn],
+		   &ife->stats.rx_bytes, /* missing for 0 */
+		   &ife->stats.rx_packets,
+		   &ife->stats.rx_errors,
+		   &ife->stats.rx_dropped,
+		   &ife->stats.rx_fifo_errors,
+		   &ife->stats.rx_frame_errors,
+		   &ife->stats.rx_compressed, /* missing for <= 1 */
+		   &ife->stats.rx_multicast, /* missing for <= 1 */
+		   &ife->stats.tx_bytes, /* missing for 0 */
+		   &ife->stats.tx_packets,
+		   &ife->stats.tx_errors,
+		   &ife->stats.tx_dropped,
+		   &ife->stats.tx_fifo_errors,
+		   &ife->stats.collisions,
+		   &ife->stats.tx_carrier_errors,
+		   &ife->stats.tx_compressed /* missing for <= 1 */
+		   );
+
+	if (procnetdev_vsn <= 1) {
+		if (procnetdev_vsn == 0) {
+			ife->stats.rx_bytes = 0;
+			ife->stats.tx_bytes = 0;
+		}
+		ife->stats.rx_multicast = 0;
+		ife->stats.rx_compressed = 0;
+		ife->stats.tx_compressed = 0;
+	}
+}
+
+static inline int procnetdev_version(char *buf)
+{
+	if (strstr(buf, "compressed"))
+		return 2;
+	if (strstr(buf, "bytes"))
+		return 1;
+	return 0;
+}
+
+static int if_readlist_proc(char *target)
+{
+	static int proc_read;
+	FILE *fh;
+	char buf[512];
+	struct interface *ife;
+	int err, procnetdev_vsn;
+
+	if (proc_read)
+		return 0;
+	if (!target)
+		proc_read = 1;
+
+	fh = fopen(_PATH_PROCNET_DEV, "r");
+	if (!fh) {
+		bb_perror_msg("warning: cannot open %s, limiting output", _PATH_PROCNET_DEV);
+		return if_readconf();
+	}
+	fgets(buf, sizeof buf, fh);	/* eat line */
+	fgets(buf, sizeof buf, fh);
+
+	procnetdev_vsn = procnetdev_version(buf);
+
+	err = 0;
+	while (fgets(buf, sizeof buf, fh)) {
+		char *s, name[128];
+
+		s = get_name(name, buf);
+		ife = add_interface(name);
+		get_dev_fields(s, ife, procnetdev_vsn);
+		ife->statistics_valid = 1;
+		if (target && !strcmp(target, name))
+			break;
+	}
+	if (ferror(fh)) {
+		perror(_PATH_PROCNET_DEV);
+		err = -1;
+		proc_read = 0;
+	}
+	fclose(fh);
+	return err;
+}
+
+static int if_readlist(void)
+{
+	int err = if_readlist_proc(NULL);
+
+	if (!err)
+		err = if_readconf();
+	return err;
+}
+
+static int for_all_interfaces(int (*doit) (struct interface *, void *),
+							  void *cookie)
+{
+	struct interface *ife;
+
+	if (!int_list && (if_readlist() < 0))
+		return -1;
+	for (ife = int_list; ife; ife = ife->next) {
+		int err = doit(ife, cookie);
+
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+/* Fetch the interface configuration from the kernel. */
+static int if_fetch(struct interface *ife)
+{
+	struct ifreq ifr;
+	int fd;
+	char *ifname = ife->name;
+
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
+		return -1;
+	ife->flags = ifr.ifr_flags;
+
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
+		memset(ife->hwaddr, 0, 32);
+	else
+		memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);
+
+	ife->type = ifr.ifr_hwaddr.sa_family;
+
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0)
+		ife->metric = 0;
+	else
+		ife->metric = ifr.ifr_metric;
+
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
+		ife->mtu = 0;
+	else
+		ife->mtu = ifr.ifr_mtu;
+
+#ifdef SIOCGIFMAP
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFMAP, &ifr) == 0)
+		ife->map = ifr.ifr_map;
+	else
+#endif
+		memset(&ife->map, 0, sizeof(struct ifmap));
+
+#ifdef HAVE_TXQUEUELEN
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) < 0)
+		ife->tx_queue_len = -1;	/* unknown value */
+	else
+		ife->tx_queue_len = ifr.ifr_qlen;
+#else
+	ife->tx_queue_len = -1;	/* unknown value */
+#endif
+
+	/* IPv4 address? */
+	fd = get_socket_for_af(AF_INET);
+	if (fd >= 0) {
+		strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+		ifr.ifr_addr.sa_family = AF_INET;
+		if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
+			ife->has_ip = 1;
+			ife->addr = ifr.ifr_addr;
+			strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+			if (ioctl(fd, SIOCGIFDSTADDR, &ifr) < 0)
+				memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
+			else
+				ife->dstaddr = ifr.ifr_dstaddr;
+
+			strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+			if (ioctl(fd, SIOCGIFBRDADDR, &ifr) < 0)
+				memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
+			else
+				ife->broadaddr = ifr.ifr_broadaddr;
+
+			strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+			if (ioctl(fd, SIOCGIFNETMASK, &ifr) < 0)
+				memset(&ife->netmask, 0, sizeof(struct sockaddr));
+			else
+				ife->netmask = ifr.ifr_netmask;
+		} else
+			memset(&ife->addr, 0, sizeof(struct sockaddr));
+	}
+
+	return 0;
+}
+
+
+static int do_if_fetch(struct interface *ife)
+{
+	if (if_fetch(ife) < 0) {
+		char *errmsg;
+
+		if (errno == ENODEV) {
+			/* Give better error message for this case. */
+			errmsg = "Device not found";
+		} else {
+			errmsg = strerror(errno);
+		}
+		bb_error_msg("%s: error fetching interface information: %s",
+				ife->name, errmsg);
+		return -1;
+	}
+	return 0;
+}
+
+/* This structure defines hardware protocols and their handlers. */
+struct hwtype {
+	const char * const name;
+	const char *title;
+	int type;
+	int alen;
+	char *(*print) (unsigned char *);
+	int (*input) (char *, struct sockaddr *);
+	int (*activate) (int fd);
+	int suppress_null_addr;
+};
+
+static const struct hwtype unspec_hwtype = {
+	.name =		"unspec",
+	.title =	"UNSPEC",
+	.type =		-1,
+	.print =	UNSPEC_print
+};
+
+static const struct hwtype loop_hwtype = {
+	.name =		"loop",
+	.title =	"Local Loopback",
+	.type =		ARPHRD_LOOPBACK
+};
+
+#include <net/if_arp.h>
+
+#if (__GLIBC__ >=2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION)
+#include <net/ethernet.h>
+#else
+#include <linux/if_ether.h>
+#endif
+
+/* Display an Ethernet address in readable format. */
+static char *pr_ether(unsigned char *ptr)
+{
+	static char buff[64];
+
+	snprintf(buff, sizeof(buff), "%02X:%02X:%02X:%02X:%02X:%02X",
+			 (ptr[0] & 0377), (ptr[1] & 0377), (ptr[2] & 0377),
+			 (ptr[3] & 0377), (ptr[4] & 0377), (ptr[5] & 0377)
+		);
+	return buff;
+}
+
+static const struct hwtype ether_hwtype = {
+	.name =		"ether",
+	.title =	"Ethernet",
+	.type =		ARPHRD_ETHER,
+	.alen =		ETH_ALEN,
+	.print =	pr_ether
+};
+
+#include <net/if_arp.h>
+
+static const struct hwtype ppp_hwtype = {
+	.name =		"ppp",
+	.title =	"Point-to-Point Protocol",
+	.type =		ARPHRD_PPP
+};
+
+#ifdef CONFIG_FEATURE_IPV6
+static const struct hwtype sit_hwtype = {
+	.name =			"sit",
+	.title =		"IPv6-in-IPv4",
+	.type =			ARPHRD_SIT,
+	.print =		UNSPEC_print,
+	.suppress_null_addr =	1
+} ;
+#endif
+
+static const struct hwtype * const hwtypes[] = {
+	&loop_hwtype,
+	&ether_hwtype,
+	&ppp_hwtype,
+	&unspec_hwtype,
+#ifdef CONFIG_FEATURE_IPV6
+	&sit_hwtype,
+#endif
+	NULL
+};
+
+#ifdef IFF_PORTSEL
+static const char * const if_port_text[] = {
+	/* Keep in step with <linux/netdevice.h> */
+	"unknown",
+	"10base2",
+	"10baseT",
+	"AUI",
+	"100baseT",
+	"100baseTX",
+	"100baseFX",
+	NULL
+};
+#endif
+
+/* Check our hardware type table for this type. */
+static const struct hwtype *get_hwntype(int type)
+{
+	const struct hwtype * const *hwp;
+
+	hwp = hwtypes;
+	while (*hwp != NULL) {
+		if ((*hwp)->type == type)
+			return *hwp;
+		hwp++;
+	}
+	return NULL;
+}
+
+/* return 1 if address is all zeros */
+static int hw_null_address(const struct hwtype *hw, void *ap)
+{
+	unsigned int i;
+	unsigned char *address = (unsigned char *) ap;
+
+	for (i = 0; i < hw->alen; i++)
+		if (address[i])
+			return 0;
+	return 1;
+}
+
+static const char TRext[] = "\0\0\0Ki\0Mi\0Gi\0Ti";
+
+static void print_bytes_scaled(unsigned long long ull, const char *end)
+{
+	unsigned long long int_part;
+	const char *ext;
+	unsigned int frac_part;
+	int i;
+
+	frac_part = 0;
+	ext = TRext;
+	int_part = ull;
+	i = 4;
+	do {
+		if (int_part >= 1024) {
+			frac_part = ((((unsigned int) int_part) & (1024-1)) * 10) / 1024;
+			int_part /= 1024;
+			ext += 3;	/* KiB, MiB, GiB, TiB */
+		}
+		--i;
+	} while (i);
+
+	printf("X bytes:%llu (%llu.%u %sB)%s", ull, int_part, frac_part, ext, end);
+}
+
+static const char * const ife_print_flags_strs[] = {
+	"UP ",
+	"BROADCAST ",
+	"DEBUG ",
+	"LOOPBACK ",
+	"POINTOPOINT ",
+	"NOTRAILERS ",
+	"RUNNING ",
+	"NOARP ",
+	"PROMISC ",
+	"ALLMULTI ",
+	"SLAVE ",
+	"MASTER ",
+	"MULTICAST ",
+#ifdef HAVE_DYNAMIC
+	"DYNAMIC "
+#endif
+};
+
+static const unsigned short ife_print_flags_mask[] = {
+	IFF_UP,
+	IFF_BROADCAST,
+	IFF_DEBUG,
+	IFF_LOOPBACK,
+	IFF_POINTOPOINT,
+	IFF_NOTRAILERS,
+	IFF_RUNNING,
+	IFF_NOARP,
+	IFF_PROMISC,
+	IFF_ALLMULTI,
+	IFF_SLAVE,
+	IFF_MASTER,
+	IFF_MULTICAST,
+#ifdef HAVE_DYNAMIC
+	IFF_DYNAMIC
+#endif
+	0
+};
+
+static void ife_print(struct interface *ptr)
+{
+	struct aftype *ap;
+	const struct hwtype *hw;
+	int hf;
+	int can_compress = 0;
+
+#ifdef HAVE_AFINET6
+	FILE *f;
+	char addr6[40], devname[20];
+	struct sockaddr_in6 sap;
+	int plen, scope, dad_status, if_idx;
+	char addr6p[8][5];
+#endif
+
+	ap = get_afntype(ptr->addr.sa_family);
+	if (ap == NULL)
+		ap = get_afntype(0);
+
+	hf = ptr->type;
+
+	if (hf == ARPHRD_CSLIP || hf == ARPHRD_CSLIP6)
+		can_compress = 1;
+
+	hw = get_hwntype(hf);
+	if (hw == NULL)
+		hw = get_hwntype(-1);
+
+	printf("%-9.9s Link encap:%s  ", ptr->name, hw->title);
+	/* For some hardware types (eg Ash, ATM) we don't print the
+	   hardware address if it's null.  */
+	if (hw->print != NULL && (!(hw_null_address(hw, ptr->hwaddr) &&
+								hw->suppress_null_addr)))
+		printf("HWaddr %s  ", hw->print((unsigned char *)ptr->hwaddr));
+#ifdef IFF_PORTSEL
+	if (ptr->flags & IFF_PORTSEL) {
+		printf("Media:%s", if_port_text[ptr->map.port] /* [0] */);
+		if (ptr->flags & IFF_AUTOMEDIA)
+			printf("(auto)");
+	}
+#endif
+	puts("");
+
+	if (ptr->has_ip) {
+		printf("          %s addr:%s ", ap->name,
+			   ap->sprint(&ptr->addr, 1));
+		if (ptr->flags & IFF_POINTOPOINT) {
+			printf(" P-t-P:%s ", ap->sprint(&ptr->dstaddr, 1));
+		}
+		if (ptr->flags & IFF_BROADCAST) {
+			printf(" Bcast:%s ", ap->sprint(&ptr->broadaddr, 1));
+		}
+		printf(" Mask:%s\n", ap->sprint(&ptr->netmask, 1));
+	}
+
+#ifdef HAVE_AFINET6
+
+#define IPV6_ADDR_ANY           0x0000U
+
+#define IPV6_ADDR_UNICAST       0x0001U
+#define IPV6_ADDR_MULTICAST     0x0002U
+#define IPV6_ADDR_ANYCAST       0x0004U
+
+#define IPV6_ADDR_LOOPBACK      0x0010U
+#define IPV6_ADDR_LINKLOCAL     0x0020U
+#define IPV6_ADDR_SITELOCAL     0x0040U
+
+#define IPV6_ADDR_COMPATv4      0x0080U
+
+#define IPV6_ADDR_SCOPE_MASK    0x00f0U
+
+#define IPV6_ADDR_MAPPED        0x1000U
+#define IPV6_ADDR_RESERVED      0x2000U	/* reserved address space */
+
+	if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
+		while (fscanf
+			   (f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
+				addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4],
+				addr6p[5], addr6p[6], addr6p[7], &if_idx, &plen, &scope,
+				&dad_status, devname) != EOF) {
+			if (!strcmp(devname, ptr->name)) {
+				sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
+						addr6p[0], addr6p[1], addr6p[2], addr6p[3],
+						addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
+				inet_pton(AF_INET6, addr6,
+						  (struct sockaddr *) &sap.sin6_addr);
+				sap.sin6_family = AF_INET6;
+				printf("          inet6 addr: %s/%d",
+					   inet6_aftype.sprint((struct sockaddr *) &sap, 1),
+					   plen);
+				printf(" Scope:");
+				switch (scope & IPV6_ADDR_SCOPE_MASK) {
+				case 0:
+					printf("Global");
+					break;
+				case IPV6_ADDR_LINKLOCAL:
+					printf("Link");
+					break;
+				case IPV6_ADDR_SITELOCAL:
+					printf("Site");
+					break;
+				case IPV6_ADDR_COMPATv4:
+					printf("Compat");
+					break;
+				case IPV6_ADDR_LOOPBACK:
+					printf("Host");
+					break;
+				default:
+					printf("Unknown");
+				}
+				puts("");
+			}
+		}
+		fclose(f);
+	}
+#endif
+
+	printf("          ");
+	/* DONT FORGET TO ADD THE FLAGS IN ife_print_short, too */
+
+	if (ptr->flags == 0) {
+		printf("[NO FLAGS] ");
+	} else {
+		int i = 0;
+		do {
+			if (ptr->flags & ife_print_flags_mask[i]) {
+				printf(ife_print_flags_strs[i]);
+			}
+		} while (ife_print_flags_mask[++i]);
+	}
+
+	/* DONT FORGET TO ADD THE FLAGS IN ife_print_short */
+	printf(" MTU:%d  Metric:%d", ptr->mtu, ptr->metric ? ptr->metric : 1);
+#ifdef SIOCSKEEPALIVE
+	if (ptr->outfill || ptr->keepalive)
+		printf("  Outfill:%d  Keepalive:%d", ptr->outfill, ptr->keepalive);
+#endif
+	puts("");
+
+	/* If needed, display the interface statistics. */
+
+	if (ptr->statistics_valid) {
+		/* XXX: statistics are currently only printed for the primary address,
+		 *      not for the aliases, although strictly speaking they're shared
+		 *      by all addresses.
+		 */
+		printf("          ");
+
+		printf("RX packets:%llu errors:%lu dropped:%lu overruns:%lu frame:%lu\n",
+			   ptr->stats.rx_packets, ptr->stats.rx_errors,
+			   ptr->stats.rx_dropped, ptr->stats.rx_fifo_errors,
+			   ptr->stats.rx_frame_errors);
+		if (can_compress)
+			printf("             compressed:%lu\n",
+				   ptr->stats.rx_compressed);
+		printf("          ");
+		printf("TX packets:%llu errors:%lu dropped:%lu overruns:%lu carrier:%lu\n",
+			   ptr->stats.tx_packets, ptr->stats.tx_errors,
+			   ptr->stats.tx_dropped, ptr->stats.tx_fifo_errors,
+			   ptr->stats.tx_carrier_errors);
+		printf("          collisions:%lu ", ptr->stats.collisions);
+		if (can_compress)
+			printf("compressed:%lu ", ptr->stats.tx_compressed);
+		if (ptr->tx_queue_len != -1)
+			printf("txqueuelen:%d ", ptr->tx_queue_len);
+		printf("\n          R");
+		print_bytes_scaled(ptr->stats.rx_bytes, "  T");
+		print_bytes_scaled(ptr->stats.tx_bytes, "\n");
+
+	}
+
+	if ((ptr->map.irq || ptr->map.mem_start || ptr->map.dma ||
+		 ptr->map.base_addr)) {
+		printf("          ");
+		if (ptr->map.irq)
+			printf("Interrupt:%d ", ptr->map.irq);
+		if (ptr->map.base_addr >= 0x100)	/* Only print devices using it for
+											   I/O maps */
+			printf("Base address:0x%lx ",
+				   (unsigned long) ptr->map.base_addr);
+		if (ptr->map.mem_start) {
+			printf("Memory:%lx-%lx ", ptr->map.mem_start,
+				   ptr->map.mem_end);
+		}
+		if (ptr->map.dma)
+			printf("DMA chan:%x ", ptr->map.dma);
+		puts("");
+	}
+	puts("");
+}
+
+
+static int do_if_print(struct interface *ife, void *cookie)
+{
+	int *opt_a = (int *) cookie;
+	int res;
+
+	res = do_if_fetch(ife);
+	if (res >= 0) {
+		if ((ife->flags & IFF_UP) || *opt_a)
+			ife_print(ife);
+	}
+	return res;
+}
+
+static struct interface *lookup_interface(char *name)
+{
+	struct interface *ife = NULL;
+
+	if (if_readlist_proc(name) < 0)
+		return NULL;
+	ife = add_interface(name);
+	return ife;
+}
+
+/* for ipv4 add/del modes */
+static int if_print(char *ifname)
+{
+	int res;
+
+	if (!ifname) {
+		res = for_all_interfaces(do_if_print, &interface_opt_a);
+	} else {
+		struct interface *ife;
+
+		ife = lookup_interface(ifname);
+		res = do_if_fetch(ife);
+		if (res >= 0)
+			ife_print(ife);
+	}
+	return res;
+}
+
+int display_interfaces(char *ifname);
+int display_interfaces(char *ifname)
+{
+	int status;
+
+	/* Create a channel to the NET kernel. */
+	if ((skfd = sockets_open(0)) < 0) {
+		bb_perror_msg_and_die("socket");
+	}
+
+	/* Do we have to show the current setup? */
+	status = if_print(ifname);
+#ifdef CONFIG_FEATURE_CLEAN_UP
+	sockets_close();
+#endif
+	exit(status < 0);
+}