Unify ping and ping6. ping has -4 and -6 which force

name resolution into IP or IPv6 only, otherwise
we take address family returned by host2sockaddr()
in lsa->sa.sa_family. IOW: "ping ::1" with do IPv6 ping,
"ping 127.0.0.1" will do IPv4 ping.
ping6 is aliased to "ping -6".

1 files changed, 452 insertions, 69 deletions

diff --git a/networking/ping.c b/networking/ping.c
index fc2de456a..7d36b7455 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -13,9 +13,30 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
+/* 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 "busybox.h"
+#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,
@@ -24,11 +45,9 @@ enum {
         MAXPACKET = 65468,
         MAX_DUP_CHK = (8 * 128),
         MAXWAIT = 10,
-        PINGINTERVAL = 1                /* second */
+        PINGINTERVAL = 1, /* 1 second */
 };
 
-static void ping(const char *host);
-
 /* common routines */
 
 static int in_cksum(unsigned short *buf, int sz)
@@ -54,34 +73,27 @@ static int in_cksum(unsigned short *buf, int sz)
         return ans;
 }
 
-#ifndef CONFIG_FEATURE_FANCY_PING
+#if !ENABLE_FEATURE_FANCY_PING
 
 /* simple version */
 
 static char *hostname;
 
-static void noresp(int ign)
+static void noresp(int ign ATTRIBUTE_UNUSED)
 {
         printf("No response from %s\n", hostname);
         exit(EXIT_FAILURE);
 }
 
-static void ping(const char *host)
+static void ping(len_and_sockaddr *lsa)
 {
-        struct hostent *h;
         struct sockaddr_in pingaddr;
         struct icmp *pkt;
         int pingsock, c;
         char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 
         pingsock = create_icmp_socket();
-
-        memset(&pingaddr, 0, sizeof(pingaddr));
-
-        pingaddr.sin_family = AF_INET;
-        h = xgethostbyname(host);
-        memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
-        hostname = h->h_name;
+        pingaddr = lsa->sin;
 
         pkt = (struct icmp *) packet;
         memset(pkt, 0, sizeof(packet));
@@ -89,15 +101,14 @@ static void ping(const char *host)
         pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
 
         c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0,
-                           (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
+                           (struct sockaddr *) &pingaddr, sizeof(pingaddr));
 
         if (c < 0) {
-                if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
+                if (ENABLE_FEATURE_CLEAN_UP)
+                        close(pingsock);
                 bb_perror_msg_and_die("sendto");
         }
 
-        signal(SIGALRM, noresp);
-        alarm(5); /* give the host 5000ms to respond */
         /* listen for replies */
         while (1) {
                 struct sockaddr_in from;
@@ -120,43 +131,140 @@ static void ping(const char *host)
         }
         if (ENABLE_FEATURE_CLEAN_UP)
                 close(pingsock);
-        printf("%s is alive!\n", hostname);
 }
 
+#if ENABLE_PING6
+static void ping6(len_and_sockaddr *lsa)
+{
+        struct sockaddr_in6 pingaddr;
+        struct icmp6_hdr *pkt;
+        int pingsock, c;
+        int sockopt;
+        char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+
+        pingsock = create_icmp6_socket();
+        pingaddr = lsa->sin6;
+
+        pkt = (struct icmp6_hdr *) packet;
+        memset(pkt, 0, sizeof(packet));
+        pkt->icmp6_type = ICMP6_ECHO_REQUEST;
+
+        sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
+        setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
+
+        c = sendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), 0,
+                           (struct sockaddr *) &pingaddr, sizeof(pingaddr));
+
+        if (c < 0) {
+                if (ENABLE_FEATURE_CLEAN_UP)
+                        close(pingsock);
+                bb_perror_msg_and_die("sendto");
+        }
+
+        /* listen for replies */
+        while (1) {
+                struct sockaddr_in6 from;
+                socklen_t fromlen = sizeof(from);
+
+                c = recvfrom(pingsock, packet, sizeof(packet), 0,
+                                (struct sockaddr *) &from, &fromlen);
+                if (c < 0) {
+                        if (errno != EINTR)
+                                bb_perror_msg("recvfrom");
+                        continue;
+                }
+                if (c >= 8) {                   /* icmp6_hdr */
+                        pkt = (struct icmp6_hdr *) packet;
+                        if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
+                                break;
+                }
+        }
+        if (ENABLE_FEATURE_CLEAN_UP)
+                close(pingsock);
+}
+#endif
+
 int ping_main(int argc, char **argv)
 {
-        argc--;
+        len_and_sockaddr *lsa;
+#if ENABLE_PING6
+        sa_family_t af = AF_UNSPEC;
+        while (++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++;
-        if (argc < 1)
+#endif
+
+        hostname = *argv;
+        if (!hostname)
                 bb_show_usage();
-        ping(*argv);
+
+#if ENABLE_PING6
+        lsa = host_and_af2sockaddr(hostname, 0, af);
+#else
+        lsa = host_and_af2sockaddr(hostname, 0, AF_INET);
+#endif
+        /* Set timer _after_ DNS resolution */
+        signal(SIGALRM, noresp);
+        alarm(5); /* give the host 5000ms to respond */
+
+#if ENABLE_PING6
+        if (lsa->sa.sa_family == AF_INET6)
+                ping6(lsa);
+        else
+#endif
+                ping(lsa);
+        printf("%s is alive!\n", hostname);
         return EXIT_SUCCESS;
 }
 
-#else /* ! CONFIG_FEATURE_FANCY_PING */
+
+#else /* FEATURE_FANCY_PING */
+
 
 /* full(er) version */
 
-#define OPT_STRING "qc:s:I:"
+#define OPT_STRING ("qvc:s:I:4" USE_PING6("6"))
 enum {
         OPT_QUIET = 1 << 0,
+        OPT_VERBOSE = 1 << 1,
+        OPT_c = 1 << 2,
+        OPT_s = 1 << 3,
+        OPT_I = 1 << 4,
+        OPT_IPV4 = 1 << 5,
+        OPT_IPV6 = (1 << 6) * ENABLE_PING6,
 };
 
-static struct sockaddr_in pingaddr;
+
+static union {
+        struct sockaddr sa;
+        struct sockaddr_in sin;
+#if ENABLE_PING6
+        struct sockaddr_in sin6;
+#endif
+} pingaddr;
 static struct sockaddr_in sourceaddr;
 static int pingsock = -1;
 static unsigned datalen; /* intentionally uninitialized to work around gcc bug */
 
+static int if_index;
+
 static unsigned long ntransmitted, nreceived, nrepeats, pingcount;
 static int myid;
 static unsigned long tmin = ULONG_MAX, tmax, tsum;
 static char rcvd_tbl[MAX_DUP_CHK / 8];
 
-static struct hostent *hostent;
-
-static void sendping(int);
-static void pingstats(int);
-static void unpack(char *, int, struct sockaddr_in *);
+static const char *hostname;
+static const char *dotted;
 
 #define A(bit)          rcvd_tbl[(bit)>>3]      /* identify byte in array */
 #define B(bit)          (1 << ((bit) & 0x07))   /* identify bit in byte */
@@ -166,25 +274,25 @@ static void unpack(char *, int, struct sockaddr_in *);
 
 /**************************************************************************/
 
-static void pingstats(int junk)
+static void pingstats(void)
 {
         int status;
 
         signal(SIGINT, SIG_IGN);
 
-        printf("\n--- %s ping statistics ---\n", hostent->h_name);
+        printf("\n--- %s ping statistics ---\n", hostname);
         printf("%lu packets transmitted, ", ntransmitted);
         printf("%lu packets received, ", nreceived);
         if (nrepeats)
                 printf("%lu duplicates, ", nrepeats);
         if (ntransmitted)
-                printf("%lu%% packet loss\n",
-                           (ntransmitted - nreceived) * 100 / ntransmitted);
+                ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted);
+        printf("%lu%% packet loss\n", ntransmitted);
         if (nreceived)
                 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
-                           tmin / 10, tmin % 10,
-                           (tsum / (nreceived + nrepeats)) / 10,
-                           (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
+                        tmin / 10, tmin % 10,
+                        (tsum / (nreceived + nrepeats)) / 10,
+                        (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
         if (nreceived != 0)
                 status = EXIT_SUCCESS;
         else
@@ -192,7 +300,7 @@ static void pingstats(int junk)
         exit(status);
 }
 
-static void sendping(int junk)
+static void sendping(int junk ATTRIBUTE_UNUSED)
 {
         struct icmp *pkt;
         int i;
@@ -212,7 +320,7 @@ static void sendping(int junk)
         pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
 
         i = sendto(pingsock, packet, sizeof(packet), 0,
-                           (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
+                        &pingaddr.sa, sizeof(pingaddr.sin));
 
         if (i < 0)
                 bb_perror_msg_and_die("sendto");
@@ -223,12 +331,50 @@ static void sendping(int junk)
         signal(SIGALRM, sendping);
         if (pingcount == 0 || ntransmitted < pingcount) {       /* schedule next in 1s */
                 alarm(PINGINTERVAL);
-        } else {                                        /* done, wait for the last ping to come back */
+        } else { /* done, wait for the last ping to come back */
+                /* todo, don't necessarily need to wait so long... */
+                signal(SIGALRM, pingstats);
+                alarm(MAXWAIT);
+        }
+}
+#if ENABLE_PING6
+static void sendping6(int junk ATTRIBUTE_UNUSED)
+{
+        struct icmp6_hdr *pkt;
+        int i;
+        char packet[datalen + sizeof (struct icmp6_hdr)];
+
+        pkt = (struct icmp6_hdr *) packet;
+
+        pkt->icmp6_type = ICMP6_ECHO_REQUEST;
+        pkt->icmp6_code = 0;
+        pkt->icmp6_cksum = 0;
+        pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
+        pkt->icmp6_id = myid;
+        CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
+        ntransmitted++;
+
+        gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);
+
+        i = sendto(pingsock, packet, sizeof(packet), 0,
+                        &pingaddr.sa, sizeof(pingaddr.sin6));
+
+        if (i < 0)
+                bb_perror_msg_and_die("sendto");
+        if ((size_t)i != sizeof(packet))
+                bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
+                           (int)sizeof(packet));
+
+        signal(SIGALRM, sendping6);
+        if (pingcount == 0 || ntransmitted < pingcount) {       /* schedule next in 1s */
+                alarm(PINGINTERVAL);
+        } else { /* done, wait for the last ping to come back */
                 /* todo, don't necessarily need to wait so long... */
                 signal(SIGALRM, pingstats);
                 alarm(MAXWAIT);
         }
 }
+#endif
 
 static char *icmp_type_name(int id)
 {
@@ -249,6 +395,34 @@ static char *icmp_type_name(int id)
         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 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(char *buf, int sz, struct sockaddr_in *from)
 {
@@ -318,27 +492,85 @@ static void unpack(char *buf, int sz, struct sockaddr_in *from)
         }
         fflush(stdout);
 }
+#if ENABLE_PING6
+static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
+{
+        struct icmp6_hdr *icmppkt;
+        struct timeval tv, *tp;
+        int dupflag;
+        unsigned long triptime;
+        char buf[INET6_ADDRSTRLEN];
+
+        gettimeofday(&tv, NULL);
+
+        /* 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);
+                ++nreceived;
+                tp = (struct timeval *) &icmppkt->icmp6_data8[4];
+
+                if ((tv.tv_usec -= tp->tv_usec) < 0) {
+                        --tv.tv_sec;
+                        tv.tv_usec += 1000000;
+                }
+                tv.tv_sec -= tp->tv_sec;
+
+                triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
+                tsum += triptime;
+                if (triptime < tmin)
+                        tmin = triptime;
+                if (triptime > tmax)
+                        tmax = triptime;
+
+                if (TST(recv_seq % MAX_DUP_CHK)) {
+                        ++nrepeats;
+                        --nreceived;
+                        dupflag = 1;
+                } else {
+                        SET(recv_seq % MAX_DUP_CHK);
+                        dupflag = 0;
+                }
+
+                if (option_mask32 & OPT_QUIET)
+                        return;
+
+                printf("%d bytes from %s: icmp6_seq=%u", sz,
+                           inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
+                                                 buf, sizeof(buf)),
+                           recv_seq);
+                printf(" ttl=%d time=%lu.%lu ms", hoplimit,
+                           triptime / 10, triptime % 10);
+                if (dupflag)
+                        printf(" (DUP!)");
+                puts("");
+        } 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));
+        }
+        fflush(stdout);
+}
+#endif
 
-static void ping(const char *host)
+static void ping(len_and_sockaddr *lsa)
 {
         char packet[datalen + MAXIPLEN + MAXICMPLEN];
         int sockopt;
 
         pingsock = create_icmp_socket();
-
+        pingaddr.sin = lsa->sin;
         if (sourceaddr.sin_addr.s_addr) {
                 xbind(pingsock, (struct sockaddr*)&sourceaddr, sizeof(sourceaddr));
         }
 
-        memset(&pingaddr, 0, sizeof(pingaddr));
-
-        pingaddr.sin_family = AF_INET;
-        hostent = xgethostbyname(host);
-        if (hostent->h_addrtype != AF_INET)
-                bb_error_msg_and_die("unknown address type; only AF_INET is currently supported");
-
-        memcpy(&pingaddr.sin_addr, hostent->h_addr, sizeof(pingaddr.sin_addr));
-
         /* enable broadcast pings */
         setsockopt_broadcast(pingsock);
 
@@ -346,9 +578,7 @@ static void ping(const char *host)
         sockopt = 48 * 1024; /* explain why 48k? */
         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 
-        printf("PING %s (%s)",
-                        hostent->h_name,
-                        inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr));
+        printf("PING %s (%s)", hostname, dotted);
         if (sourceaddr.sin_addr.s_addr) {
                 printf(" from %s",
                         inet_ntoa(*(struct in_addr *) &sourceaddr.sin_addr.s_addr));
@@ -377,8 +607,100 @@ static void ping(const char *host)
                 if (pingcount > 0 && nreceived >= pingcount)
                         break;
         }
-        pingstats(0);
 }
+#if ENABLE_PING6
+extern int BUG_bad_offsetof_icmp6_cksum(void);
+static void ping6(len_and_sockaddr *lsa)
+{
+        char packet[datalen + MAXIPLEN + MAXICMPLEN];
+        char buf[INET6_ADDRSTRLEN];
+        int sockopt;
+        struct msghdr msg;
+        struct sockaddr_in6 from;
+        struct iovec iov;
+        char control_buf[CMSG_SPACE(36)];
+
+        pingsock = create_icmp6_socket();
+        pingaddr.sin6 = lsa->sin6;
+        //if (sourceaddr.sin_addr.s_addr) {
+        //      xbind(pingsock, (struct sockaddr*)&sourceaddr, sizeof(sourceaddr));
+        //}
+
+#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 for broadcast pings */
+        sockopt = 48 * 1024; /* explain why 48k? */
+        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_scope_id = if_index;
+
+        printf("PING %s (%s): %d data bytes\n", hostname, dotted, datalen);
+
+        signal(SIGINT, pingstats);
+
+        /* 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 = packet;
+        iov.iov_len = sizeof(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);
+                        }
+                }
+                unpack6(packet, c, &from, hoplimit);
+                if (pingcount > 0 && nreceived >= pingcount)
+                        break;
+        }
+}
+#endif
 
 /* TODO: consolidate ether-wake.c, dnsd.c, ifupdown.c, nslookup.c
  * versions of below thing. BTW we have far too many "%u.%u.%u.%u" too...
@@ -403,26 +725,87 @@ static int parse_nipquad(const char *str, struct sockaddr_in* addr)
 
 int ping_main(int argc, char **argv)
 {
+        const char *hostname;
         char *opt_c, *opt_s, *opt_I;
+        USE_PING6(sa_family_t af = AF_UNSPEC;)
 
         datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
 
-        /* exactly one argument needed */
-        opt_complementary = "=1";
+        /* exactly one argument needed, -v and -q don't mix. So do 4, 6 */
+        opt_complementary = "=1:q--v:v--q" USE_PING6(":4--6:6--4");
         getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
-        if (option_mask32 & 2) pingcount = xatoul(opt_c); // -c
-        if (option_mask32 & 4) datalen = xatou16(opt_s); // -s
-        if (option_mask32 & 8) { // -I
-/* TODO: ping6 accepts iface too:
-                if_index = if_nametoindex(*argv);
-                if (!if_index) ...
-make it true for ping. */
-                if (parse_nipquad(opt_I, &sourceaddr))
-                        bb_show_usage();
+        if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c
+        if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
+        if (option_mask32 & OPT_I) { // -I
+                if_index = if_nametoindex(opt_I);
+                if (!if_index)
+                        if (parse_nipquad(opt_I, &sourceaddr))
+                                bb_show_usage();
         }
-
         myid = (int16_t) getpid();
-        ping(argv[optind]);
+        hostname = argv[optind];
+#if ENABLE_PING6
+        if (option_mask32 & OPT_IPV4)
+                af = AF_INET;
+        if (option_mask32 & OPT_IPV6)
+                af = AF_INET6;
+        lsa = host_and_af2sockaddr(hostname, 0, af);
+#else
+        lsa = host_and_af2sockaddr(hostname, 0, AF_INET);
+#endif
+        dotted = xmalloc_sockaddr2dotted_noport(lsa->sa, lsa->len);
+#if ENABLE_PING6
+        if (lsa->sa.sa_family == AF_INET6)
+                ping6(lsa);
+        else
+#endif
+                ping(lsa);
+        pingstats();
         return EXIT_SUCCESS;
 }
-#endif /* ! CONFIG_FEATURE_FANCY_PING */
+#endif /* FEATURE_FANCY_PING */
+
+
+#if ENABLE_PING6
+int ping6_main(int argc, char **argv)
+{
+        argv[0] = "-6";
+        return ping_main(argc + 1, argv - 1);
+}
+#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.
+ */