source: MondoRescue/branches/stable/mindi-busybox/networking/ping.c@ 1770

/* 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 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 "libbb.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,
    MAXIPLEN = 60,
    MAXICMPLEN = 76,
    MAXPACKET = 65468,
    MAX_DUP_CHK = (8 * 128),
    MAXWAIT = 10,
    PINGINTERVAL = 1, /* 1 second */
};

/* common routines */

static int in_cksum(unsigned short *buf, int sz)
{
    int nleft = sz;
    int sum = 0;
    unsigned short *w = buf;
    unsigned short ans = 0;

    while (nleft > 1) {
        sum += *w++;
        nleft -= 2;
    }

    if (nleft == 1) {
        *(unsigned char *) (&ans) = *(unsigned char *) w;
        sum += ans;
    }

    sum = (sum >> 16) + (sum & 0xFFFF);
    sum += (sum >> 16);
    ans = ~sum;
    return ans;
}

#if !ENABLE_FEATURE_FANCY_PING

/* simple version */

static char *hostname;

static void noresp(int ign ATTRIBUTE_UNUSED)
{
    printf("No response from %s\n", hostname);
    exit(EXIT_FAILURE);
}

static void ping4(len_and_sockaddr *lsa)
{
    struct sockaddr_in pingaddr;
    struct icmp *pkt;
    int pingsock, c;
    char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];

    pingsock = create_icmp_socket();
    pingaddr = lsa->sin;

    pkt = (struct icmp *) packet;
    memset(pkt, 0, sizeof(packet));
    pkt->icmp_type = ICMP_ECHO;
    pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));

    c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN,
               (struct sockaddr *) &pingaddr, sizeof(pingaddr));

    /* listen for replies */
    while (1) {
        struct sockaddr_in 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 >= 76) {          /* ip + icmp */
            struct iphdr *iphdr = (struct iphdr *) packet;

            pkt = (struct icmp *) (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 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 = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr),
               (struct sockaddr *) &pingaddr, sizeof(pingaddr));

    /* 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);
int ping_main(int argc, char **argv)
{
    len_and_sockaddr *lsa;
#if ENABLE_PING6
    sa_family_t af = AF_UNSPEC;

    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

    hostname = *argv;
    if (!hostname)
        bb_show_usage();

#if ENABLE_PING6
    lsa = xhost_and_af2sockaddr(hostname, 0, af);
#else
    lsa = xhost_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
        ping4(lsa);
    printf("%s is alive!\n", hostname);
    return EXIT_SUCCESS;
}


#else /* FEATURE_FANCY_PING */


/* full(er) version */

#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,
};


struct globals {
    int pingsock;
    len_and_sockaddr *source_lsa;
    unsigned datalen;
    int if_index;
    unsigned long ntransmitted, nreceived, nrepeats, pingcount;
    uint16_t myid;
    unsigned tmin, tmax; /* in us */
    unsigned long long tsum; /* in us, sum of all times */
    const char *hostname;
    const char *dotted;
    union {
        struct sockaddr sa;
        struct sockaddr_in sin;
#if ENABLE_PING6
        struct sockaddr_in6 sin6;
#endif
    } pingaddr;
    char rcvd_tbl[MAX_DUP_CHK / 8];
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define pingsock     (G.pingsock    )
#define source_lsa   (G.source_lsa  )
#define datalen      (G.datalen     )
#define if_index     (G.if_index    )
#define ntransmitted (G.ntransmitted)
#define nreceived    (G.nreceived   )
#define nrepeats     (G.nrepeats    )
#define pingcount    (G.pingcount   )
#define myid         (G.myid        )
#define tmin         (G.tmin        )
#define tmax         (G.tmax        )
#define tsum         (G.tsum        )
#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(); \
    pingsock = -1; \
    tmin = UINT_MAX; \
} while (0)


#define A(bit)      rcvd_tbl[(bit)>>3]  /* identify byte in array */
#define B(bit)      (1 << ((bit) & 0x07))   /* identify bit in byte */
#define SET(bit)    (A(bit) |= B(bit))
#define CLR(bit)    (A(bit) &= (~B(bit)))
#define TST(bit)    (A(bit) & B(bit))

/**************************************************************************/

static void pingstats(int junk ATTRIBUTE_UNUSED)
{
    signal(SIGINT, SIG_IGN);

    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)
        ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
    printf("%lu%% packet loss\n", ntransmitted);
    if (tmin != UINT_MAX) {
        unsigned tavg = tsum / (nreceived + 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);
    }
    exit(nreceived == 0); /* (nreceived == 0) is true (1) -- 'failure' */
}

static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
{
    int sz;

    CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
    ntransmitted++;

    /* sizeof(pingaddr) can be larger than real sa size, but I think
     * it doesn't matter */
    sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr));
    if (sz != size_pkt)
        bb_error_msg_and_die(bb_msg_write_error);

    signal(SIGALRM, sp);
    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);
    }
}

static void sendping4(int junk ATTRIBUTE_UNUSED)
{
    /* +4 reserves a place for timestamp, which may end up sitting
     * *after* packet. Saves one if() */
    struct icmp *pkt = alloca(datalen + ICMP_MINLEN + 4);

    pkt->icmp_type = ICMP_ECHO;
    pkt->icmp_code = 0;
    pkt->icmp_cksum = 0;
    pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
    pkt->icmp_id = myid;

    /* We don't do hton, because we will read it back on the same machine */
    /*if (datalen >= 4)*/
        *(uint32_t*)&pkt->icmp_dun = monotonic_us();

    pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);

    sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
}
#if ENABLE_PING6
static void sendping6(int junk ATTRIBUTE_UNUSED)
{
    struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr) + 4);

    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;

    /*if (datalen >= 4)*/
        *(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();

    sendping_tail(sendping6, pkt, datalen + 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)
{
    const char *dupmsg = " (DUP!)";
    unsigned triptime = triptime; /* for gcc */

    ++nreceived;

    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;
    }

    if (TST(recv_seq % MAX_DUP_CHK)) {
        ++nrepeats;
        --nreceived;
    } else {
        SET(recv_seq % MAX_DUP_CHK);
        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(stdout);
}
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, &pingaddr.sin6.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)
{
    char packet[datalen + MAXIPLEN + MAXICMPLEN];
    int sockopt;

    pingsock = create_icmp_socket();
    pingaddr.sin = lsa->sin;
    if (source_lsa) {
        if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
                &source_lsa->sa, source_lsa->len))
            bb_error_msg_and_die("can't set multicast source interface");
        xbind(pingsock, &source_lsa->sa, source_lsa->len);
    }

    /* 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));

    signal(SIGINT, pingstats);

    /* 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, packet, sizeof(packet), 0,
                (struct sockaddr *) &from, &fromlen);
        if (c < 0) {
            if (errno != EINTR)
                bb_perror_msg("recvfrom");
            continue;
        }
        unpack4(packet, c, &from);
        if (pingcount > 0 && nreceived >= pingcount)
            break;
    }
}
#if ENABLE_PING6
extern int BUG_bad_offsetof_icmp6_cksum(void);
static void ping6(len_and_sockaddr *lsa)
{
    char packet[datalen + MAXIPLEN + MAXICMPLEN];
    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;
    /* untested whether "-I addr" really works for IPv6: */
    if (source_lsa)
        xbind(pingsock, &source_lsa->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 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.sin6_scope_id = if_index;

    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

static void ping(len_and_sockaddr *lsa)
{
    printf("PING %s (%s)", hostname, dotted);
    if (source_lsa) {
        printf(" from %s",
            xmalloc_sockaddr2dotted_noport(&source_lsa->sa));
    }
    printf(": %d data bytes\n", datalen);

#if ENABLE_PING6
    if (lsa->sa.sa_family == AF_INET6)
        ping6(lsa);
    else
#endif
        ping4(lsa);
}

int ping_main(int argc, char **argv);
int ping_main(int argc, char **argv)
{
    len_and_sockaddr *lsa;
    char *opt_c, *opt_s, *opt_I;
    USE_PING6(sa_family_t af = AF_UNSPEC;)

    INIT_G();

    datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */

    /* exactly one argument needed, -v and -q don't mix */
    opt_complementary = "=1:q--v:v--q";
    getopt32(argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
    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) {
            /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
            source_lsa = xdotted2sockaddr(opt_I, 0);
        }
    }
    myid = (uint16_t) getpid();
    hostname = argv[optind];
#if ENABLE_PING6
    if (option_mask32 & OPT_IPV4)
        af = AF_INET;
    if (option_mask32 & 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->sa.sa_family != lsa->sa.sa_family)
        /* leaking it here... */
        source_lsa = NULL;

    dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa);
    ping(lsa);
    pingstats(0);
    return EXIT_SUCCESS;
}
#endif /* FEATURE_FANCY_PING */


#if ENABLE_PING6
int ping6_main(int argc, char **argv);
int ping6_main(int argc, char **argv)
{
    argv[0] = (char*)"-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.
 */