#if 0
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#ifndef lint
static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
#endif
#else
#include <sys/cdefs.h>
#if !defined(lint) && !defined(__HAIKU__)
__RCSID("$NetBSD: traceroute6.c,v 1.52 2021/02/03 06:42:50 roy Exp $");
#endif
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#ifndef __HAIKU__
#include <sys/sysctl.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <err.h>
#ifdef HAVE_POLL
#include <poll.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/udp.h>
#ifdef IPSEC
#include <net/route.h>
#include <netipsec/ipsec.h>
#endif
#include "as.h"
#define DUMMY_PORT 10010
#define MAXPACKET 65535
#ifndef HAVE_GETIPNODEBYNAME
#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
#define freehostent(x)
#endif
struct tv32 {
u_int32_t tv32_sec;
u_int32_t tv32_usec;
};
struct opacket {
u_char seq;
u_char hops;
u_char pad[2];
struct tv32 tv;
};
static u_char packet[512];
static struct opacket *outpacket;
static ssize_t wait_for_reply(int, struct msghdr *);
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
static int setpolicy(int, const char *);
#endif
static void send_probe(int, u_long);
static struct udphdr *get_udphdr(struct ip6_hdr *, u_char *);
static double deltaT(struct timeval *, struct timeval *);
static const char *pr_type(int);
static int packet_ok(struct msghdr *, ssize_t, int);
static void print(struct msghdr *, int);
static const char *inetname(struct sockaddr *);
static void usage(void) __attribute__((__noreturn__));
static int rcvsock;
static int sndsock;
static struct msghdr rcvmhdr;
static struct iovec rcviov[2];
static int rcvhlim;
static struct in6_pktinfo *rcvpktinfo;
static struct sockaddr_in6 Src, Dst, Rcv;
static u_long datalen;
#define ICMP6ECHOLEN 8
static char *source;
static char *hostname;
static u_long nprobes = 3;
static u_long first_hop = 1;
static u_long max_hops = 30;
static u_int16_t srcport;
static u_int16_t port = 32768+666;
static u_int16_t ident;
static int options;
static int verbose;
static int waittime = 5;
static int nflag;
static int useicmp;
static int lflag;
static int as_path;
static char *as_server = NULL;
static void *asn;
int
main(int argc, char *argv[])
{
#ifndef __HAIKU__
int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM };
#endif
char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep;
int ch, i, on = 1, seq, rcvcmsglen, error;
u_long minlen;
struct addrinfo hints, *res;
static u_char *rcvcmsgbuf;
u_long probe, hops, lport;
size_t size;
if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
err(5, "socket(ICMPv6)");
seteuid(getuid());
setuid(getuid());
#ifndef __HAIKU__
size = sizeof(i);
(void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0);
max_hops = i;
#else
max_hops = 30;
#endif
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_RECVPKTINFO)");
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
seq = 0;
while ((ch = getopt(argc, argv, "aA:df:Ilm:np:q:rs:w:v")) != -1)
switch (ch) {
case 'a':
as_path = 1;
break;
case 'A':
as_path = 1;
as_server = optarg;
break;
case 'd':
options |= SO_DEBUG;
break;
case 'f':
ep = NULL;
errno = 0;
first_hop = strtoul(optarg, &ep, 0);
if (errno || !*optarg || *ep|| first_hop > 255)
errx(1, "Invalid min hoplimit `%s'", optarg);
break;
case 'I':
useicmp++;
ident = htons(arc4random() & 0xffff);
break;
case 'l':
lflag++;
break;
case 'm':
ep = NULL;
errno = 0;
max_hops = strtoul(optarg, &ep, 0);
if (errno || !*optarg || *ep || max_hops > 255)
errx(1, "Invalid max hoplimit `%s'", optarg);
break;
case 'n':
nflag++;
break;
case 'p':
ep = NULL;
errno = 0;
lport = strtoul(optarg, &ep, 0);
if (errno || !*optarg || *ep)
errx(1, "Invalid port `%s'", optarg);
if (lport == 0 || lport != (lport & 0xffff))
errx(1, "Port `%s' out of range", optarg);
port = lport & 0xffff;
break;
case 'q':
ep = NULL;
errno = 0;
nprobes = strtoul(optarg, &ep, 0);
if (errno || !*optarg || *ep)
errx(1, "Invalid nprobes `%s'", optarg);
if (nprobes < 1)
errx(1, "nprobes `%s' must be > 0", optarg);
break;
case 'r':
options |= SO_DONTROUTE;
break;
case 's':
source = optarg;
break;
case 'v':
verbose++;
break;
case 'w':
ep = NULL;
errno = 0;
waittime = strtoul(optarg, &ep, 0);
if (errno || !*optarg || *ep)
errx(1, "Invalid wait time `%s'", optarg);
if (waittime <= 1)
errx(1, "Wait `%s' must be > 1 sec", optarg);
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (max_hops < first_hop)
errx(1, "max hoplimit `%lu' must be larger than "
"first hoplimit `%lu'", max_hops, first_hop);
if (argc < 1 || argc > 2)
usage();
#if 1
setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
#else
setlinebuf(stdout);
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_RAW;
hints.ai_protocol = IPPROTO_ICMPV6;
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(*argv, NULL, &hints, &res);
if (error)
errx(1, "%s", gai_strerror(error));
if (res->ai_addrlen != sizeof(Dst))
errx(1, "size of sockaddr mismatch");
memcpy(&Dst, res->ai_addr, res->ai_addrlen);
hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
if (!hostname)
err(1, NULL);
if (res->ai_next) {
if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf,
sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
strlcpy(hbuf, "?", sizeof(hbuf));
warnx("`%s' has multiple addresses; using `%s'",
hostname, hbuf);
}
if (*++argv) {
ep = NULL;
errno = 0;
datalen = strtoul(*argv, &ep, 0);
if (errno || *ep)
errx(1, "Invalid packet length `%s'", *argv);
}
if (useicmp)
minlen = ICMP6ECHOLEN + sizeof(struct tv32);
else
minlen = sizeof(struct opacket);
if (datalen < minlen)
datalen = minlen;
else if (datalen >= MAXPACKET)
errx(1, "Packet size must be %lu <= s < %lu",
minlen, (u_long)MAXPACKET);
outpacket = (struct opacket *)malloc((unsigned)datalen);
if (!outpacket)
err(1, NULL);
memset(outpacket, 0, datalen);
rcviov[0].iov_base = (caddr_t)packet;
rcviov[0].iov_len = sizeof(packet);
rcvmhdr.msg_name = (caddr_t)&Rcv;
rcvmhdr.msg_namelen = sizeof(Rcv);
rcvmhdr.msg_iov = rcviov;
rcvmhdr.msg_iovlen = 1;
rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL)
err(1, NULL);
rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
rcvmhdr.msg_controllen = rcvcmsglen;
if (options & SO_DEBUG)
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
(char *)&on, sizeof(on));
if (options & SO_DONTROUTE)
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
(char *)&on, sizeof(on));
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
if (setpolicy(rcvsock, "in bypass") < 0)
errx(1, "%s", ipsec_strerror());
if (setpolicy(rcvsock, "out bypass") < 0)
errx(1, "%s", ipsec_strerror());
#endif
if (useicmp) {
sndsock = rcvsock;
} else {
if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(5, "socket(SOCK_DGRAM)");
}
i = datalen;
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i,
sizeof(i)) < 0)
err(6, "setsockopt(SO_SNDBUF)");
if (options & SO_DEBUG)
(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
(char *)&on, sizeof(on));
if (options & SO_DONTROUTE)
(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
(char *)&on, sizeof(on));
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
if (setpolicy(sndsock, "in bypass") < 0)
errx(1, "%s", ipsec_strerror());
if (setpolicy(sndsock, "out bypass") < 0)
errx(1, "%s", ipsec_strerror());
#endif
memset(&Src, 0, sizeof(Src));
if (source) {
struct addrinfo hints0, *res0;
int error0;
memset(&hints0, 0, sizeof(hints0));
hints0.ai_family = AF_INET6;
hints0.ai_socktype = SOCK_DGRAM;
hints0.ai_flags = AI_NUMERICHOST;
error0 = getaddrinfo(source, "0", &hints0, &res0);
if (error0)
errx(1, "Cannot get address for `%s' (%s)", source,
gai_strerror(error0));
if (res0->ai_addrlen > sizeof(Src))
errx(1, "Bad incompatible address length");
memcpy(&Src, res0->ai_addr, res0->ai_addrlen);
freeaddrinfo(res0);
} else {
struct sockaddr_in6 Nxt;
int dummy;
socklen_t len;
Nxt = Dst;
Nxt.sin6_port = htons(DUMMY_PORT);
if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0)
err(1, "connect");
len = sizeof(Src);
if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0)
err(1, "getsockname");
if ((error = getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)))
errx(1, "getnameinfo failed for source (%s)",
gai_strerror(error));
source = src0;
close(dummy);
}
Src.sin6_port = htons(0);
if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0)
err(1, "bind");
{
socklen_t len;
len = sizeof(Src);
if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0)
err(1, "bind");
srcport = ntohs(Src.sin6_port);
}
if (as_path) {
asn = as_setup(as_server);
if (asn == NULL) {
warnx("as_setup failed, AS# lookups disabled");
(void)fflush(stderr);
as_path = 0;
}
}
if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
strlcpy(hbuf, "(invalid)", sizeof(hbuf));
fprintf(stderr, "traceroute6");
fprintf(stderr, " to %s (%s)", hostname, hbuf);
if (source)
fprintf(stderr, " from %s", source);
fprintf(stderr, ", %lu hops max, %lu byte packets\n",
max_hops, datalen);
(void) fflush(stderr);
if (first_hop > 1)
printf("Skipping %lu intermediate hops\n", first_hop - 1);
for (hops = first_hop; hops <= max_hops; ++hops) {
struct in6_addr lastaddr;
int got_there = 0;
u_long unreachable = 0;
printf("%2lu ", hops);
memset(&lastaddr, 0, sizeof(lastaddr));
for (probe = 0; probe < nprobes; ++probe) {
int cc;
struct timeval t1, t2;
(void) gettimeofday(&t1, NULL);
if (!useicmp && htons((in_port_t)(port + seq + 1)) == 0)
seq++;
send_probe(++seq, hops);
while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
(void) gettimeofday(&t2, NULL);
if ((i = packet_ok(&rcvmhdr, cc, seq))) {
if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
&lastaddr)) {
print(&rcvmhdr, cc);
lastaddr = Rcv.sin6_addr;
}
printf(" %g ms", deltaT(&t1, &t2));
switch (i - 1) {
case ICMP6_DST_UNREACH_NOROUTE:
++unreachable;
printf(" !N");
break;
case ICMP6_DST_UNREACH_ADMIN:
++unreachable;
printf(" !X");
break;
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
++unreachable;
printf(" !S");
break;
case ICMP6_DST_UNREACH_ADDR:
++unreachable;
printf(" !H");
break;
case ICMP6_DST_UNREACH_NOPORT:
if (rcvhlim >= 0 &&
rcvhlim <= 1)
printf(" !");
++got_there;
break;
}
break;
}
}
if (cc == 0)
printf(" *");
(void) fflush(stdout);
}
putchar('\n');
if (got_there ||
(unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
exit(0);
}
}
if (as_path)
as_shutdown(asn);
exit(0);
}
static ssize_t
wait_for_reply(int sock, struct msghdr *mhdr)
{
#ifdef HAVE_POLL
struct pollfd pfd[1];
ssize_t cc = 0;
pfd[0].fd = sock;
pfd[0].events = POLLIN;
pfd[0].revents = 0;
if (poll(pfd, 1, waittime * 1000) > 0)
cc = recvmsg(rcvsock, mhdr, 0);
return cc;
#else
fd_set *fdsp;
struct timeval wait;
ssize_t cc = 0;
int fdsn;
fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
err(1, "malloc");
memset(fdsp, 0, fdsn);
FD_SET(sock, fdsp);
wait.tv_sec = waittime; wait.tv_usec = 0;
if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
cc = recvmsg(rcvsock, mhdr, 0);
free(fdsp);
return cc;
#endif
}
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
static int
setpolicy(int so, const char *policy)
{
char *buf;
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL) {
warnx("%s", ipsec_strerror());
return -1;
}
(void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
buf, ipsec_get_policylen(buf));
free(buf);
return 0;
}
#endif
static void
send_probe(int seq, u_long hops)
{
struct timeval tv;
struct tv32 tv32;
int i;
i = hops;
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
(char *)&i, sizeof(i)) < 0)
warn("setsockopt IPV6_UNICAST_HOPS");
Dst.sin6_port = htons(port + seq);
(void) gettimeofday(&tv, NULL);
tv32.tv32_sec = htonl(tv.tv_sec);
tv32.tv32_usec = htonl(tv.tv_usec);
if (useicmp) {
struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket;
icp->icmp6_type = ICMP6_ECHO_REQUEST;
icp->icmp6_code = 0;
icp->icmp6_cksum = 0;
icp->icmp6_id = ident;
icp->icmp6_seq = htons(seq);
memcpy(((u_int8_t *)outpacket + ICMP6ECHOLEN), &tv32,
sizeof(tv32));
} else {
struct opacket *op = outpacket;
op->seq = seq;
op->hops = hops;
memcpy(&op->tv, &tv32, sizeof tv32);
}
i = sendto(sndsock, (char *)outpacket, datalen , 0,
(struct sockaddr *)&Dst, Dst.sin6_len);
if (i < 0 || i != (int)datalen) {
if (i < 0)
warnx("sendto");
printf("traceroute6: wrote %s %lu chars, ret=%d\n",
hostname, datalen, i);
(void) fflush(stdout);
}
}
static double
deltaT(struct timeval *t1p, struct timeval *t2p)
{
double dt;
dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
(double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
return dt;
}
static const char *
pr_type(int t0)
{
u_char t = t0 & 0xff;
const char *cp;
switch (t) {
case ICMP6_DST_UNREACH:
cp = "Destination Unreachable";
break;
case ICMP6_PACKET_TOO_BIG:
cp = "Packet Too Big";
break;
case ICMP6_TIME_EXCEEDED:
cp = "Time Exceeded";
break;
case ICMP6_PARAM_PROB:
cp = "Parameter Problem";
break;
case ICMP6_ECHO_REQUEST:
cp = "Echo Request";
break;
case ICMP6_ECHO_REPLY:
cp = "Echo Reply";
break;
case ICMP6_MEMBERSHIP_QUERY:
cp = "Group Membership Query";
break;
case ICMP6_MEMBERSHIP_REPORT:
cp = "Group Membership Report";
break;
case ICMP6_MEMBERSHIP_REDUCTION:
cp = "Group Membership Reduction";
break;
case ND_ROUTER_SOLICIT:
cp = "Router Solicitation";
break;
case ND_ROUTER_ADVERT:
cp = "Router Advertisement";
break;
case ND_NEIGHBOR_SOLICIT:
cp = "Neighbor Solicitation";
break;
case ND_NEIGHBOR_ADVERT:
cp = "Neighbor Advertisement";
break;
case ND_REDIRECT:
cp = "Redirect";
break;
default:
cp = "Unknown";
break;
}
return cp;
}
static int
packet_ok(struct msghdr *mhdr, ssize_t cc, int seq)
{
struct icmp6_hdr *icp;
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
u_char type, code;
char *buf = (char *)mhdr->msg_iov[0].iov_base;
struct cmsghdr *cm;
int *hlimp;
char hbuf[NI_MAXHOST];
if (cc < (ssize_t)sizeof(struct icmp6_hdr)) {
if (verbose) {
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
strlcpy(hbuf, "invalid", sizeof(hbuf));
printf("data too short (%zd bytes) from %s\n", cc,
hbuf);
}
return 0;
}
icp = (struct icmp6_hdr *)buf;
rcvpktinfo = NULL;
hlimp = NULL;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO &&
cm->cmsg_len ==
CMSG_LEN(sizeof(struct in6_pktinfo)))
rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_HOPLIMIT &&
cm->cmsg_len == CMSG_LEN(sizeof(int)))
hlimp = (int *)CMSG_DATA(cm);
}
if (rcvpktinfo == NULL || hlimp == NULL) {
warnx("failed to get received hop limit or packet info");
#if 0
return 0;
#else
rcvhlim = 0;
#endif
}
else
rcvhlim = *hlimp;
type = icp->icmp6_type;
code = icp->icmp6_code;
if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|| type == ICMP6_DST_UNREACH) {
struct ip6_hdr *hip;
struct udphdr *up;
hip = (struct ip6_hdr *)(icp + 1);
if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
if (verbose)
warnx("failed to get upper layer header");
return 0;
}
if (useicmp &&
((struct icmp6_hdr *)up)->icmp6_id == ident &&
((struct icmp6_hdr *)up)->icmp6_seq == htons(seq))
return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1;
else if (!useicmp &&
up->uh_sport == htons(srcport) &&
up->uh_dport == htons(port + seq))
return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1;
} else if (useicmp && type == ICMP6_ECHO_REPLY) {
if (icp->icmp6_id == ident &&
icp->icmp6_seq == htons(seq))
return ICMP6_DST_UNREACH_NOPORT + 1;
}
if (verbose) {
char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
u_int8_t *p;
ssize_t i;
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0)
strlcpy(sbuf, "invalid", sizeof(sbuf));
printf("\n%zd bytes from %s to %s", cc, sbuf,
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
dbuf, sizeof(dbuf)) : "?");
printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
icp->icmp6_code);
p = (u_int8_t *)(icp + 1);
#define WIDTH 16
for (i = 0; i < cc; i++) {
if (i % WIDTH == 0)
printf("%04zx:", i);
if (i % 4 == 0)
printf(" ");
printf("%02x", p[i]);
if (i % WIDTH == WIDTH - 1)
printf("\n");
}
if (cc % WIDTH != 0)
printf("\n");
}
return 0;
}
static struct udphdr *
get_udphdr(struct ip6_hdr *ip6, u_char *lim)
{
u_char *cp = (u_char *)ip6, nh;
int hlen;
if (cp + sizeof(*ip6) >= lim)
return NULL;
nh = ip6->ip6_nxt;
cp += sizeof(struct ip6_hdr);
while (lim - cp >= 8) {
switch (nh) {
case IPPROTO_ESP:
case IPPROTO_TCP:
return NULL;
case IPPROTO_ICMPV6:
return useicmp ? (struct udphdr *)cp : NULL;
case IPPROTO_UDP:
return useicmp ? NULL : (struct udphdr *)cp;
case IPPROTO_FRAGMENT:
hlen = sizeof(struct ip6_frag);
nh = ((struct ip6_frag *)cp)->ip6f_nxt;
break;
case IPPROTO_AH:
hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
break;
default:
hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
break;
}
cp += hlen;
}
return NULL;
}
static void
print(struct msghdr *mhdr, int cc)
{
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
char hbuf[NI_MAXHOST];
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
strlcpy(hbuf, "invalid", sizeof(hbuf));
if (as_path)
printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6));
if (nflag)
printf(" %s", hbuf);
else if (lflag)
printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
else
printf(" %s", inetname((struct sockaddr *)from));
if (verbose) {
printf(" %d bytes of data to %s", cc,
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
hbuf, sizeof(hbuf)) : "?");
}
}
static const char *
inetname(struct sockaddr *sa)
{
static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1];
static int first = 1;
char *cp;
if (first && !nflag) {
first = 0;
if (gethostname(domain, sizeof(domain)) == 0 &&
(cp = strchr(domain, '.')))
(void) strlcpy(domain, cp + 1, sizeof(domain));
else
domain[0] = 0;
}
cp = NULL;
if (!nflag) {
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
NI_NAMEREQD) == 0) {
if ((cp = strchr(line, '.')) &&
!strcmp(cp + 1, domain))
*cp = 0;
cp = line;
}
}
if (cp)
return cp;
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
NI_NUMERICHOST) != 0)
strlcpy(line, "invalid", sizeof(line));
return line;
}
static void
usage(void)
{
fprintf(stderr,
"Usage: %s [-adIlnrv] [-A as_server] [-f firsthop] [-m hoplimit]\n"
"\t[-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n",
getprogname());
exit(1);
}
