remove suid bit from busybox, try experimental ping patch from John Spencer

1 files changed, 1135 insertions, 0 deletions

diff --git a/package/busybox/patches/004-ping.patch b/package/busybox/patches/004-ping.patch
new file mode 100644
index 000000000..aeb1f9706
--- /dev/null
+++ b/package/busybox/patches/004-ping.patch
@@ -0,0 +1,1135 @@
+diff -Nur busybox-1.22.1.orig/networking/ping.c busybox-1.22.1/networking/ping.c
+--- busybox-1.22.1.orig/networking/ping.c	2014-01-20 03:38:10.000000000 +0100
++++ busybox-1.22.1/networking/ping.c	2014-05-24 14:31:09.000000000 +0200
+@@ -152,6 +152,7 @@
+ 	pingsock = 0,
+ };
+ 
++static int using_dgram;
+ static void
+ #if ENABLE_PING6
+ create_icmp_socket(len_and_sockaddr *lsa)
+@@ -184,6 +185,7 @@
+ 		if (sock < 0)
+ #endif
+ 		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
++		using_dgram = 1;
+ 	}
+ 
+ 	xmove_fd(sock, pingsock);
+@@ -234,10 +236,12 @@
+ 				bb_perror_msg("recvfrom");
+ 			continue;
+ 		}
+-		if (c >= 76) {			/* ip + icmp */
+-			struct iphdr *iphdr = (struct iphdr *) G.packet;
++		if (c >= 76 || using_dgram && (c == 64)) {			/* ip + icmp */
++			if(!using_dgram) {
++				struct iphdr *iphdr = (struct iphdr *) G.packet;
+ 
+-			pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));	/* skip ip hdr */
++				pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));	/* skip ip hdr */
++			} else pkt = (struct icmp *) G.packet;
+ 			if (pkt->icmp_type == ICMP_ECHOREPLY)
+ 				break;
+ 		}
+@@ -628,19 +632,21 @@
+ }
+ static void unpack4(char *buf, int sz, struct sockaddr_in *from)
+ {
+-	struct icmp *icmppkt;
+ 	struct iphdr *iphdr;
++	struct icmp *icmppkt;
+ 	int hlen;
+ 
+ 	/* discard if too short */
+ 	if (sz < (datalen + ICMP_MINLEN))
+ 		return;
++	if(!using_dgram) {
++		/* check IP header */
++		iphdr = (struct iphdr *) buf;
++		hlen = iphdr->ihl << 2;
++		sz -= hlen;
++		icmppkt = (struct icmp *) (buf + hlen);
++	} else icmppkt = (struct icmp *) buf;
+ 
+-	/* check IP header */
+-	iphdr = (struct iphdr *) buf;
+-	hlen = iphdr->ihl << 2;
+-	sz -= hlen;
+-	icmppkt = (struct icmp *) (buf + hlen);
+ 	if (icmppkt->icmp_id != myid)
+ 		return;				/* not our ping */
+ 
+@@ -652,7 +658,7 @@
+ 			tp = (uint32_t *) icmppkt->icmp_data;
+ 		unpack_tail(sz, tp,
+ 			inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
+-			recv_seq, iphdr->ttl);
++			recv_seq, using_dgram ? 42 : iphdr->ttl);
+ 	} else if (icmppkt->icmp_type != ICMP_ECHO) {
+ 		bb_error_msg("warning: got ICMP %d (%s)",
+ 				icmppkt->icmp_type,
+@@ -696,11 +702,31 @@
+ 	int sockopt;
+ 
+ 	pingaddr.sin = lsa->u.sin;
+-	if (source_lsa) {
++	if (source_lsa && !using_dgram) {
+ 		if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
+ 				&source_lsa->u.sa, source_lsa->len))
+ 			bb_error_msg_and_die("can't set multicast source interface");
+ 		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
++	} else if(using_dgram) {
++		struct sockaddr_in sa;
++		socklen_t sl;
++
++		sa.sin_family = AF_INET;
++		sa.sin_port = 0;
++		sa.sin_addr.s_addr = source_lsa ?
++			source_lsa->u.sin.sin_addr.s_addr : 0;
++		sl = sizeof(sa);
++
++		if (bind(pingsock, (struct sockaddr *) &sa, sl) == -1) {
++			perror("bind");
++			exit(2);
++		}
++
++		if (getsockname(pingsock, (struct sockaddr *) &sa, &sl) == -1) {
++			perror("getsockname");
++			exit(2);
++		}
++		myid = sa.sin_port;
+ 	}
+ 
+ 	/* enable broadcast pings */
+@@ -717,6 +743,15 @@
+ 		setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
+ 	}
+ 
++	if(using_dgram) {
++		int hold = 65536;
++		if (setsockopt(pingsock, SOL_IP, IP_RECVTTL, (char *)&hold, sizeof(hold)))
++			perror("WARNING: setsockopt(IP_RECVTTL)");
++		if (setsockopt(pingsock, SOL_IP, IP_RETOPTS, (char *)&hold, sizeof(hold)))
++			perror("WARNING: setsockopt(IP_RETOPTS)");
++
++	}
++
+ 	signal(SIGINT, print_stats_and_exit);
+ 
+ 	/* start the ping's going ... */
+@@ -751,10 +786,33 @@
+ 	char control_buf[CMSG_SPACE(36)];
+ 
+ 	pingaddr.sin6 = lsa->u.sin6;
+-	if (source_lsa)
++	if (source_lsa && !using_dgram)
+ 		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
++	else if(using_dgram) {
++                struct sockaddr_in6 sa = {0};
++                socklen_t sl;
++
++                sa.sin6_family = AF_INET6;
++                sa.sin6_port = 0;
++		if(source_lsa) {
++			memcpy(&sa.sin6_addr, &source_lsa->u.sin6.sin6_addr, sizeof(struct in6_addr));
++		}
++                sl = sizeof(sa);
++
++                if (bind(pingsock, (struct sockaddr *) &sa, sl) == -1) {
++                        perror("bind");
++                        exit(2);
++                }
++
++                if (getsockname(pingsock, (struct sockaddr *) &sa, &sl) == -1) {
++                        perror("getsockname");
++                        exit(2);
++                }
++                myid = sa.sin6_port;
++	}
+ 
+ #ifdef ICMP6_FILTER
++	if(!using_dgram)
+ 	{
+ 		struct icmp6_filter filt;
+ 		if (!(option_mask32 & OPT_VERBOSE)) {
+@@ -880,7 +938,7 @@
+ 			str_I = NULL; /* don't try to bind to device later */
+ 		}
+ 	}
+-	myid = (uint16_t) getpid();
++	if(!using_dgram) myid = (uint16_t) getpid();
+ 	hostname = argv[optind];
+ #if ENABLE_PING6
+ 	{
+diff -Nur busybox-1.22.1.orig/networking/ping.c.orig busybox-1.22.1/networking/ping.c.orig
+--- busybox-1.22.1.orig/networking/ping.c.orig	1970-01-01 01:00:00.000000000 +0100
++++ busybox-1.22.1/networking/ping.c.orig	2014-01-20 03:38:10.000000000 +0100
+@@ -0,0 +1,966 @@
++/* vi: set sw=4 ts=4: */
++/*
++ * Mini ping implementation for busybox
++ *
++ * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
++ *
++ * Adapted from the ping in netkit-base 0.10:
++ * Copyright (c) 1989 The Regents of the University of California.
++ * All rights reserved.
++ *
++ * This code is derived from software contributed to Berkeley by
++ * Mike Muuss.
++ *
++ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
++ */
++/* from ping6.c:
++ * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
++ *
++ * This version of ping is adapted from the ping in netkit-base 0.10,
++ * which is:
++ *
++ * Original copyright notice is retained at the end of this file.
++ *
++ * This version is an adaptation of ping.c from busybox.
++ * The code was modified by Bart Visscher <magick@linux-fan.com>
++ */
++
++#include <net/if.h>
++#include <netinet/ip_icmp.h>
++#include "libbb.h"
++
++#ifdef __BIONIC__
++/* should be in netinet/ip_icmp.h */
++# define ICMP_DEST_UNREACH    3  /* Destination Unreachable  */
++# define ICMP_SOURCE_QUENCH   4  /* Source Quench    */
++# define ICMP_REDIRECT        5  /* Redirect (change route)  */
++# define ICMP_ECHO            8  /* Echo Request      */
++# define ICMP_TIME_EXCEEDED  11  /* Time Exceeded    */
++# define ICMP_PARAMETERPROB  12  /* Parameter Problem    */
++# define ICMP_TIMESTAMP      13  /* Timestamp Request    */
++# define ICMP_TIMESTAMPREPLY 14  /* Timestamp Reply    */
++# define ICMP_INFO_REQUEST   15  /* Information Request    */
++# define ICMP_INFO_REPLY     16  /* Information Reply    */
++# define ICMP_ADDRESS        17  /* Address Mask Request    */
++# define ICMP_ADDRESSREPLY   18  /* Address Mask Reply    */
++#endif
++
++//config:config PING
++//config:	bool "ping"
++//config:	default y
++//config:	select PLATFORM_LINUX
++//config:	help
++//config:	  ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
++//config:	  elicit an ICMP ECHO_RESPONSE from a host or gateway.
++//config:
++//config:config PING6
++//config:	bool "ping6"
++//config:	default y
++//config:	depends on FEATURE_IPV6 && PING
++//config:	help
++//config:	  This will give you a ping that can talk IPv6.
++//config:
++//config:config FEATURE_FANCY_PING
++//config:	bool "Enable fancy ping output"
++//config:	default y
++//config:	depends on PING
++//config:	help
++//config:	  Make the output from the ping applet include statistics, and at the
++//config:	  same time provide full support for ICMP packets.
++
++/* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */
++//applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE))
++//applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE))
++
++//kbuild:lib-$(CONFIG_PING)  += ping.o
++//kbuild:lib-$(CONFIG_PING6) += ping.o
++
++//usage:#if !ENABLE_FEATURE_FANCY_PING
++//usage:# define ping_trivial_usage
++//usage:       "HOST"
++//usage:# define ping_full_usage "\n\n"
++//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
++//usage:# define ping6_trivial_usage
++//usage:       "HOST"
++//usage:# define ping6_full_usage "\n\n"
++//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
++//usage:#else
++//usage:# define ping_trivial_usage
++//usage:       "[OPTIONS] HOST"
++//usage:# define ping_full_usage "\n\n"
++//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
++//usage:	IF_PING6(
++//usage:     "\n	-4,-6		Force IP or IPv6 name resolution"
++//usage:	)
++//usage:     "\n	-c CNT		Send only CNT pings"
++//usage:     "\n	-s SIZE		Send SIZE data bytes in packets (default:56)"
++//usage:     "\n	-t TTL		Set TTL"
++//usage:     "\n	-I IFACE/IP	Use interface or IP address as source"
++//usage:     "\n	-W SEC		Seconds to wait for the first response (default:10)"
++//usage:     "\n			(after all -c CNT packets are sent)"
++//usage:     "\n	-w SEC		Seconds until ping exits (default:infinite)"
++//usage:     "\n			(can exit earlier with -c CNT)"
++//usage:     "\n	-q		Quiet, only displays output at start"
++//usage:     "\n			and when finished"
++//usage:
++//usage:# define ping6_trivial_usage
++//usage:       "[OPTIONS] HOST"
++//usage:# define ping6_full_usage "\n\n"
++//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
++//usage:     "\n	-c CNT		Send only CNT pings"
++//usage:     "\n	-s SIZE		Send SIZE data bytes in packets (default:56)"
++//usage:     "\n	-I IFACE/IP	Use interface or IP address as source"
++//usage:     "\n	-q		Quiet, only displays output at start"
++//usage:     "\n			and when finished"
++//usage:
++//usage:#endif
++//usage:
++//usage:#define ping_example_usage
++//usage:       "$ ping localhost\n"
++//usage:       "PING slag (127.0.0.1): 56 data bytes\n"
++//usage:       "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
++//usage:       "\n"
++//usage:       "--- debian ping statistics ---\n"
++//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
++//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
++//usage:#define ping6_example_usage
++//usage:       "$ ping6 ip6-localhost\n"
++//usage:       "PING ip6-localhost (::1): 56 data bytes\n"
++//usage:       "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
++//usage:       "\n"
++//usage:       "--- ip6-localhost ping statistics ---\n"
++//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
++//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
++
++#if ENABLE_PING6
++# include <netinet/icmp6.h>
++/* I see RENUMBERED constants in bits/in.h - !!?
++ * What a fuck is going on with libc? Is it a glibc joke? */
++# ifdef IPV6_2292HOPLIMIT
++#  undef IPV6_HOPLIMIT
++#  define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
++# endif
++#endif
++
++enum {
++	DEFDATALEN = 56,
++	MAXIPLEN = 60,
++	MAXICMPLEN = 76,
++	MAX_DUP_CHK = (8 * 128),
++	MAXWAIT = 10,
++	PINGINTERVAL = 1, /* 1 second */
++	pingsock = 0,
++};
++
++static void
++#if ENABLE_PING6
++create_icmp_socket(len_and_sockaddr *lsa)
++#else
++create_icmp_socket(void)
++#define create_icmp_socket(lsa) create_icmp_socket()
++#endif
++{
++	int sock;
++#if ENABLE_PING6
++	if (lsa->u.sa.sa_family == AF_INET6)
++		sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
++	else
++#endif
++		sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
++	if (sock < 0) {
++		if (errno != EPERM)
++			bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
++#if defined(__linux__) || defined(__APPLE__)
++		/* We don't have root privileges.  Try SOCK_DGRAM instead.
++		 * Linux needs net.ipv4.ping_group_range for this to work.
++		 * MacOSX allows ICMP_ECHO, ICMP_TSTAMP or ICMP_MASKREQ
++		 */
++#if ENABLE_PING6
++		if (lsa->u.sa.sa_family == AF_INET6)
++			sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6);
++		else
++#endif
++			sock = socket(AF_INET, SOCK_DGRAM, 1); /* 1 == ICMP */
++		if (sock < 0)
++#endif
++		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
++	}
++
++	xmove_fd(sock, pingsock);
++}
++
++#if !ENABLE_FEATURE_FANCY_PING
++
++/* Simple version */
++
++struct globals {
++	char *hostname;
++	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
++} FIX_ALIASING;
++#define G (*(struct globals*)&bb_common_bufsiz1)
++#define INIT_G() do { } while (0)
++
++static void noresp(int ign UNUSED_PARAM)
++{
++	printf("No response from %s\n", G.hostname);
++	exit(EXIT_FAILURE);
++}
++
++static void ping4(len_and_sockaddr *lsa)
++{
++	struct icmp *pkt;
++	int c;
++
++	pkt = (struct icmp *) G.packet;
++	/*memset(pkt, 0, sizeof(G.packet)); already is */
++	pkt->icmp_type = ICMP_ECHO;
++	pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));
++
++	xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
++
++	/* listen for replies */
++	while (1) {
++#if 0
++		struct sockaddr_in from;
++		socklen_t fromlen = sizeof(from);
++
++		c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
++				(struct sockaddr *) &from, &fromlen);
++#else
++		c = recv(pingsock, G.packet, sizeof(G.packet), 0);
++#endif
++		if (c < 0) {
++			if (errno != EINTR)
++				bb_perror_msg("recvfrom");
++			continue;
++		}
++		if (c >= 76) {			/* ip + icmp */
++			struct iphdr *iphdr = (struct iphdr *) G.packet;
++
++			pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));	/* skip ip hdr */
++			if (pkt->icmp_type == ICMP_ECHOREPLY)
++				break;
++		}
++	}
++	if (ENABLE_FEATURE_CLEAN_UP)
++		close(pingsock);
++}
++
++#if ENABLE_PING6
++static void ping6(len_and_sockaddr *lsa)
++{
++	struct icmp6_hdr *pkt;
++	int c;
++	int sockopt;
++
++	pkt = (struct icmp6_hdr *) G.packet;
++	/*memset(pkt, 0, sizeof(G.packet)); already is */
++	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
++
++	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
++	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
++
++	xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
++
++	/* listen for replies */
++	while (1) {
++#if 0
++		struct sockaddr_in6 from;
++		socklen_t fromlen = sizeof(from);
++
++		c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
++				(struct sockaddr *) &from, &fromlen);
++#else
++		c = recv(pingsock, G.packet, sizeof(G.packet), 0);
++#endif
++		if (c < 0) {
++			if (errno != EINTR)
++				bb_perror_msg("recvfrom");
++			continue;
++		}
++		if (c >= ICMP_MINLEN) {	/* icmp6_hdr */
++			if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
++				break;
++		}
++	}
++	if (ENABLE_FEATURE_CLEAN_UP)
++		close(pingsock);
++}
++#endif
++
++#if !ENABLE_PING6
++# define common_ping_main(af, argv) common_ping_main(argv)
++#endif
++static int common_ping_main(sa_family_t af, char **argv)
++{
++	len_and_sockaddr *lsa;
++
++	INIT_G();
++
++#if ENABLE_PING6
++	while ((++argv)[0] && argv[0][0] == '-') {
++		if (argv[0][1] == '4') {
++			af = AF_INET;
++			continue;
++		}
++		if (argv[0][1] == '6') {
++			af = AF_INET6;
++			continue;
++		}
++		bb_show_usage();
++	}
++#else
++	argv++;
++#endif
++
++	G.hostname = *argv;
++	if (!G.hostname)
++		bb_show_usage();
++
++#if ENABLE_PING6
++	lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
++#else
++	lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
++#endif
++	/* Set timer _after_ DNS resolution */
++	signal(SIGALRM, noresp);
++	alarm(5); /* give the host 5000ms to respond */
++
++	create_icmp_socket(lsa);
++#if ENABLE_PING6
++	if (lsa->u.sa.sa_family == AF_INET6)
++		ping6(lsa);
++	else
++#endif
++		ping4(lsa);
++	printf("%s is alive!\n", G.hostname);
++	return EXIT_SUCCESS;
++}
++
++
++#else /* FEATURE_FANCY_PING */
++
++
++/* Full(er) version */
++
++#define OPT_STRING ("qvc:s:t:w:W:I:n4" IF_PING6("6"))
++enum {
++	OPT_QUIET = 1 << 0,
++	OPT_VERBOSE = 1 << 1,
++	OPT_c = 1 << 2,
++	OPT_s = 1 << 3,
++	OPT_t = 1 << 4,
++	OPT_w = 1 << 5,
++	OPT_W = 1 << 6,
++	OPT_I = 1 << 7,
++	/*OPT_n = 1 << 8, - ignored */
++	OPT_IPV4 = 1 << 9,
++	OPT_IPV6 = (1 << 10) * ENABLE_PING6,
++};
++
++
++struct globals {
++	int if_index;
++	char *str_I;
++	len_and_sockaddr *source_lsa;
++	unsigned datalen;
++	unsigned pingcount; /* must be int-sized */
++	unsigned opt_ttl;
++	unsigned long ntransmitted, nreceived, nrepeats;
++	uint16_t myid;
++	unsigned tmin, tmax; /* in us */
++	unsigned long long tsum; /* in us, sum of all times */
++	unsigned deadline;
++	unsigned timeout;
++	unsigned total_secs;
++	unsigned sizeof_rcv_packet;
++	char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
++	void *snd_packet; /* [datalen + ipv4/ipv6_const] */
++	const char *hostname;
++	const char *dotted;
++	union {
++		struct sockaddr sa;
++		struct sockaddr_in sin;
++#if ENABLE_PING6
++		struct sockaddr_in6 sin6;
++#endif
++	} pingaddr;
++	unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
++} FIX_ALIASING;
++#define G (*(struct globals*)&bb_common_bufsiz1)
++#define if_index     (G.if_index    )
++#define source_lsa   (G.source_lsa  )
++#define str_I        (G.str_I       )
++#define datalen      (G.datalen     )
++#define pingcount    (G.pingcount   )
++#define opt_ttl      (G.opt_ttl     )
++#define myid         (G.myid        )
++#define tmin         (G.tmin        )
++#define tmax         (G.tmax        )
++#define tsum         (G.tsum        )
++#define deadline     (G.deadline    )
++#define timeout      (G.timeout     )
++#define total_secs   (G.total_secs  )
++#define hostname     (G.hostname    )
++#define dotted       (G.dotted      )
++#define pingaddr     (G.pingaddr    )
++#define rcvd_tbl     (G.rcvd_tbl    )
++void BUG_ping_globals_too_big(void);
++#define INIT_G() do { \
++	if (sizeof(G) > COMMON_BUFSIZE) \
++		BUG_ping_globals_too_big(); \
++	datalen = DEFDATALEN; \
++	timeout = MAXWAIT; \
++	tmin = UINT_MAX; \
++} while (0)
++
++
++#define BYTE(bit)	rcvd_tbl[(bit)>>3]
++#define MASK(bit)	(1 << ((bit) & 7))
++#define SET(bit)	(BYTE(bit) |= MASK(bit))
++#define CLR(bit)	(BYTE(bit) &= (~MASK(bit)))
++#define TST(bit)	(BYTE(bit) & MASK(bit))
++
++static void print_stats_and_exit(int junk) NORETURN;
++static void print_stats_and_exit(int junk UNUSED_PARAM)
++{
++	unsigned long ul;
++	unsigned long nrecv;
++
++	signal(SIGINT, SIG_IGN);
++
++	nrecv = G.nreceived;
++	printf("\n--- %s ping statistics ---\n"
++		"%lu packets transmitted, "
++		"%lu packets received, ",
++		hostname, G.ntransmitted, nrecv
++	);
++	if (G.nrepeats)
++		printf("%lu duplicates, ", G.nrepeats);
++	ul = G.ntransmitted;
++	if (ul != 0)
++		ul = (ul - nrecv) * 100 / ul;
++	printf("%lu%% packet loss\n", ul);
++	if (tmin != UINT_MAX) {
++		unsigned tavg = tsum / (nrecv + G.nrepeats);
++		printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
++			tmin / 1000, tmin % 1000,
++			tavg / 1000, tavg % 1000,
++			tmax / 1000, tmax % 1000);
++	}
++	/* if condition is true, exit with 1 -- 'failure' */
++	exit(nrecv == 0 || (deadline && nrecv < pingcount));
++}
++
++static void sendping_tail(void (*sp)(int), int size_pkt)
++{
++	int sz;
++
++	CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK);
++	G.ntransmitted++;
++
++	size_pkt += datalen;
++
++	/* sizeof(pingaddr) can be larger than real sa size, but I think
++	 * it doesn't matter */
++	sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
++	if (sz != size_pkt)
++		bb_error_msg_and_die(bb_msg_write_error);
++
++	if (pingcount == 0 || deadline || G.ntransmitted < pingcount) {
++		/* Didn't send all pings yet - schedule next in 1s */
++		signal(SIGALRM, sp);
++		if (deadline) {
++			total_secs += PINGINTERVAL;
++			if (total_secs >= deadline)
++				signal(SIGALRM, print_stats_and_exit);
++		}
++		alarm(PINGINTERVAL);
++	} else { /* -c NN, and all NN are sent (and no deadline) */
++		/* Wait for the last ping to come back.
++		 * -W timeout: wait for a response in seconds.
++		 * Affects only timeout in absense of any responses,
++		 * otherwise ping waits for two RTTs. */
++		unsigned expire = timeout;
++
++		if (G.nreceived) {
++			/* approx. 2*tmax, in seconds (2 RTT) */
++			expire = tmax / (512*1024);
++			if (expire == 0)
++				expire = 1;
++		}
++		signal(SIGALRM, print_stats_and_exit);
++		alarm(expire);
++	}
++}
++
++static void sendping4(int junk UNUSED_PARAM)
++{
++	struct icmp *pkt = G.snd_packet;
++
++	//memset(pkt, 0, datalen + ICMP_MINLEN + 4); - G.snd_packet was xzalloced
++	pkt->icmp_type = ICMP_ECHO;
++	/*pkt->icmp_code = 0;*/
++	pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
++	pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
++	pkt->icmp_id = myid;
++
++	/* If datalen < 4, we store timestamp _past_ the packet,
++	 * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
++	 */
++	/*if (datalen >= 4)*/
++		/* No hton: we'll read it back on the same machine */
++		*(uint32_t*)&pkt->icmp_dun = monotonic_us();
++
++	pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
++
++	sendping_tail(sendping4, ICMP_MINLEN);
++}
++#if ENABLE_PING6
++static void sendping6(int junk UNUSED_PARAM)
++{
++	struct icmp6_hdr *pkt = G.snd_packet;
++
++	//memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
++	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
++	/*pkt->icmp6_code = 0;*/
++	/*pkt->icmp6_cksum = 0;*/
++	pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
++	pkt->icmp6_id = myid;
++
++	/*if (datalen >= 4)*/
++		*(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
++
++	//TODO? pkt->icmp_cksum = inet_cksum(...);
++
++	sendping_tail(sendping6, sizeof(struct icmp6_hdr));
++}
++#endif
++
++static const char *icmp_type_name(int id)
++{
++	switch (id) {
++	case ICMP_ECHOREPLY:      return "Echo Reply";
++	case ICMP_DEST_UNREACH:   return "Destination Unreachable";
++	case ICMP_SOURCE_QUENCH:  return "Source Quench";
++	case ICMP_REDIRECT:       return "Redirect (change route)";
++	case ICMP_ECHO:           return "Echo Request";
++	case ICMP_TIME_EXCEEDED:  return "Time Exceeded";
++	case ICMP_PARAMETERPROB:  return "Parameter Problem";
++	case ICMP_TIMESTAMP:      return "Timestamp Request";
++	case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
++	case ICMP_INFO_REQUEST:   return "Information Request";
++	case ICMP_INFO_REPLY:     return "Information Reply";
++	case ICMP_ADDRESS:        return "Address Mask Request";
++	case ICMP_ADDRESSREPLY:   return "Address Mask Reply";
++	default:                  return "unknown ICMP type";
++	}
++}
++#if ENABLE_PING6
++/* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
++ * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
++#ifndef MLD_LISTENER_QUERY
++# define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
++#endif
++#ifndef MLD_LISTENER_REPORT
++# define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
++#endif
++#ifndef MLD_LISTENER_REDUCTION
++# define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
++#endif
++static const char *icmp6_type_name(int id)
++{
++	switch (id) {
++	case ICMP6_DST_UNREACH:      return "Destination Unreachable";
++	case ICMP6_PACKET_TOO_BIG:   return "Packet too big";
++	case ICMP6_TIME_EXCEEDED:    return "Time Exceeded";
++	case ICMP6_PARAM_PROB:       return "Parameter Problem";
++	case ICMP6_ECHO_REPLY:       return "Echo Reply";
++	case ICMP6_ECHO_REQUEST:     return "Echo Request";
++	case MLD_LISTENER_QUERY:     return "Listener Query";
++	case MLD_LISTENER_REPORT:    return "Listener Report";
++	case MLD_LISTENER_REDUCTION: return "Listener Reduction";
++	default:                     return "unknown ICMP type";
++	}
++}
++#endif
++
++static void unpack_tail(int sz, uint32_t *tp,
++		const char *from_str,
++		uint16_t recv_seq, int ttl)
++{
++	unsigned char *b, m;
++	const char *dupmsg = " (DUP!)";
++	unsigned triptime = triptime; /* for gcc */
++
++	if (tp) {
++		/* (int32_t) cast is for hypothetical 64-bit unsigned */
++		/* (doesn't hurt 32-bit real-world anyway) */
++		triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
++		tsum += triptime;
++		if (triptime < tmin)
++			tmin = triptime;
++		if (triptime > tmax)
++			tmax = triptime;
++	}
++
++	b = &BYTE(recv_seq % MAX_DUP_CHK);
++	m = MASK(recv_seq % MAX_DUP_CHK);
++	/*if TST(recv_seq % MAX_DUP_CHK):*/
++	if (*b & m) {
++		++G.nrepeats;
++	} else {
++		/*SET(recv_seq % MAX_DUP_CHK):*/
++		*b |= m;
++		++G.nreceived;
++		dupmsg += 7;
++	}
++
++	if (option_mask32 & OPT_QUIET)
++		return;
++
++	printf("%d bytes from %s: seq=%u ttl=%d", sz,
++		from_str, recv_seq, ttl);
++	if (tp)
++		printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
++	puts(dupmsg);
++	fflush_all();
++}
++static void unpack4(char *buf, int sz, struct sockaddr_in *from)
++{
++	struct icmp *icmppkt;
++	struct iphdr *iphdr;
++	int hlen;
++
++	/* discard if too short */
++	if (sz < (datalen + ICMP_MINLEN))
++		return;
++
++	/* check IP header */
++	iphdr = (struct iphdr *) buf;
++	hlen = iphdr->ihl << 2;
++	sz -= hlen;
++	icmppkt = (struct icmp *) (buf + hlen);
++	if (icmppkt->icmp_id != myid)
++		return;				/* not our ping */
++
++	if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
++		uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
++		uint32_t *tp = NULL;
++
++		if (sz >= ICMP_MINLEN + sizeof(uint32_t))
++			tp = (uint32_t *) icmppkt->icmp_data;
++		unpack_tail(sz, tp,
++			inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
++			recv_seq, iphdr->ttl);
++	} else if (icmppkt->icmp_type != ICMP_ECHO) {
++		bb_error_msg("warning: got ICMP %d (%s)",
++				icmppkt->icmp_type,
++				icmp_type_name(icmppkt->icmp_type));
++	}
++}
++#if ENABLE_PING6
++static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
++{
++	struct icmp6_hdr *icmppkt;
++	char buf[INET6_ADDRSTRLEN];
++
++	/* discard if too short */
++	if (sz < (datalen + sizeof(struct icmp6_hdr)))
++		return;
++
++	icmppkt = (struct icmp6_hdr *) packet;
++	if (icmppkt->icmp6_id != myid)
++		return;				/* not our ping */
++
++	if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
++		uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
++		uint32_t *tp = NULL;
++
++		if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
++			tp = (uint32_t *) &icmppkt->icmp6_data8[4];
++		unpack_tail(sz, tp,
++			inet_ntop(AF_INET6, &from->sin6_addr,
++					buf, sizeof(buf)),
++			recv_seq, hoplimit);
++	} else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
++		bb_error_msg("warning: got ICMP %d (%s)",
++				icmppkt->icmp6_type,
++				icmp6_type_name(icmppkt->icmp6_type));
++	}
++}
++#endif
++
++static void ping4(len_and_sockaddr *lsa)
++{
++	int sockopt;
++
++	pingaddr.sin = lsa->u.sin;
++	if (source_lsa) {
++		if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
++				&source_lsa->u.sa, source_lsa->len))
++			bb_error_msg_and_die("can't set multicast source interface");
++		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
++	}
++
++	/* enable broadcast pings */
++	setsockopt_broadcast(pingsock);
++
++	/* set recv buf (needed if we can get lots of responses: flood ping,
++	 * broadcast ping etc) */
++	sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
++	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
++
++	if (opt_ttl != 0) {
++		setsockopt(pingsock, IPPROTO_IP, IP_TTL, &opt_ttl, sizeof(opt_ttl));
++		/* above doesnt affect packets sent to bcast IP, so... */
++		setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
++	}
++
++	signal(SIGINT, print_stats_and_exit);
++
++	/* start the ping's going ... */
++	sendping4(0);
++
++	/* listen for replies */
++	while (1) {
++		struct sockaddr_in from;
++		socklen_t fromlen = (socklen_t) sizeof(from);
++		int c;
++
++		c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
++				(struct sockaddr *) &from, &fromlen);
++		if (c < 0) {
++			if (errno != EINTR)
++				bb_perror_msg("recvfrom");
++			continue;
++		}
++		unpack4(G.rcv_packet, c, &from);
++		if (pingcount && G.nreceived >= pingcount)
++			break;
++	}
++}
++#if ENABLE_PING6
++extern int BUG_bad_offsetof_icmp6_cksum(void);
++static void ping6(len_and_sockaddr *lsa)
++{
++	int sockopt;
++	struct msghdr msg;
++	struct sockaddr_in6 from;
++	struct iovec iov;
++	char control_buf[CMSG_SPACE(36)];
++
++	pingaddr.sin6 = lsa->u.sin6;
++	if (source_lsa)
++		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
++
++#ifdef ICMP6_FILTER
++	{
++		struct icmp6_filter filt;
++		if (!(option_mask32 & OPT_VERBOSE)) {
++			ICMP6_FILTER_SETBLOCKALL(&filt);
++			ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
++		} else {
++			ICMP6_FILTER_SETPASSALL(&filt);
++		}
++		if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
++					sizeof(filt)) < 0)
++			bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
++	}
++#endif /*ICMP6_FILTER*/
++
++	/* enable broadcast pings */
++	setsockopt_broadcast(pingsock);
++
++	/* set recv buf (needed if we can get lots of responses: flood ping,
++	 * broadcast ping etc) */
++	sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
++	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
++
++	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
++	if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
++		BUG_bad_offsetof_icmp6_cksum();
++	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
++
++	/* request ttl info to be returned in ancillary data */
++	setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
++
++	if (if_index)
++		pingaddr.sin6.sin6_scope_id = if_index;
++
++	signal(SIGINT, print_stats_and_exit);
++
++	/* start the ping's going ... */
++	sendping6(0);
++
++	/* listen for replies */
++	msg.msg_name = &from;
++	msg.msg_namelen = sizeof(from);
++	msg.msg_iov = &iov;
++	msg.msg_iovlen = 1;
++	msg.msg_control = control_buf;
++	iov.iov_base = G.rcv_packet;
++	iov.iov_len = G.sizeof_rcv_packet;
++	while (1) {
++		int c;
++		struct cmsghdr *mp;
++		int hoplimit = -1;
++		msg.msg_controllen = sizeof(control_buf);
++
++		c = recvmsg(pingsock, &msg, 0);
++		if (c < 0) {
++			if (errno != EINTR)
++				bb_perror_msg("recvfrom");
++			continue;
++		}
++		for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
++			if (mp->cmsg_level == SOL_IPV6
++			 && mp->cmsg_type == IPV6_HOPLIMIT
++			 /* don't check len - we trust the kernel: */
++			 /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
++			) {
++				/*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
++				move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
++			}
++		}
++		unpack6(G.rcv_packet, c, &from, hoplimit);
++		if (pingcount && G.nreceived >= pingcount)
++			break;
++	}
++}
++#endif
++
++static void ping(len_and_sockaddr *lsa)
++{
++	printf("PING %s (%s)", hostname, dotted);
++	if (source_lsa) {
++		printf(" from %s",
++			xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
++	}
++	printf(": %d data bytes\n", datalen);
++
++	create_icmp_socket(lsa);
++	/* untested whether "-I addr" really works for IPv6: */
++	if (str_I)
++		setsockopt_bindtodevice(pingsock, str_I);
++
++	G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
++	G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
++#if ENABLE_PING6
++	if (lsa->u.sa.sa_family == AF_INET6) {
++		/* +4 reserves a place for timestamp, which may end up sitting
++		 * _after_ packet. Saves one if() - see sendping4/6() */
++		G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
++		ping6(lsa);
++	} else
++#endif
++	{
++		G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
++		ping4(lsa);
++	}
++}
++
++static int common_ping_main(int opt, char **argv)
++{
++	len_and_sockaddr *lsa;
++	char *str_s;
++
++	INIT_G();
++
++	/* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
++	opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
++	opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I);
++	if (opt & OPT_s)
++		datalen = xatou16(str_s); // -s
++	if (opt & OPT_I) { // -I
++		if_index = if_nametoindex(str_I);
++		if (!if_index) {
++			/* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
++			source_lsa = xdotted2sockaddr(str_I, 0);
++			str_I = NULL; /* don't try to bind to device later */
++		}
++	}
++	myid = (uint16_t) getpid();
++	hostname = argv[optind];
++#if ENABLE_PING6
++	{
++		sa_family_t af = AF_UNSPEC;
++		if (opt & OPT_IPV4)
++			af = AF_INET;
++		if (opt & OPT_IPV6)
++			af = AF_INET6;
++		lsa = xhost_and_af2sockaddr(hostname, 0, af);
++	}
++#else
++	lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
++#endif
++
++	if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
++		/* leaking it here... */
++		source_lsa = NULL;
++
++	dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
++	ping(lsa);
++	print_stats_and_exit(EXIT_SUCCESS);
++	/*return EXIT_SUCCESS;*/
++}
++#endif /* FEATURE_FANCY_PING */
++
++
++int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
++int ping_main(int argc UNUSED_PARAM, char **argv)
++{
++#if !ENABLE_FEATURE_FANCY_PING
++	return common_ping_main(AF_UNSPEC, argv);
++#else
++	return common_ping_main(0, argv);
++#endif
++}
++
++#if ENABLE_PING6
++int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
++int ping6_main(int argc UNUSED_PARAM, char **argv)
++{
++# if !ENABLE_FEATURE_FANCY_PING
++	return common_ping_main(AF_INET6, argv);
++# else
++	return common_ping_main(OPT_IPV6, argv);
++# endif
++}
++#endif
++
++/* from ping6.c:
++ * Copyright (c) 1989 The Regents of the University of California.
++ * All rights reserved.
++ *
++ * This code is derived from software contributed to Berkeley by
++ * Mike Muuss.
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ *    notice, this list of conditions and the following disclaimer.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ *    notice, this list of conditions and the following disclaimer in the
++ *    documentation and/or other materials provided with the distribution.
++ *
++ * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
++ *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
++ *
++ * 4. Neither the name of the University nor the names of its contributors
++ *    may be used to endorse or promote products derived from this software
++ *    without specific prior written permission.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
++ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
++ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
++ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
++ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
++ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
++ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
++ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
++ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
++ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
++ * SUCH DAMAGE.
++ */