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HardenedBSD/sbin/ping/ping.c
Warner Losh 0b8224d1cc Remove copyright strings ifdef'd out 
We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by:		Netflix
2023-11-26 22:23:58 -07:00

1685 lines
45 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1989, 1993
* 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. 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.
*/
/*
* P I N G . C
*
* Using the Internet Control Message Protocol (ICMP) "ECHO" facility,
* measure round-trip-delays and packet loss across network paths.
*
* Author -
* Mike Muuss
* U. S. Army Ballistic Research Laboratory
* December, 1983
*
* Status -
* Public Domain. Distribution Unlimited.
* Bugs -
* More statistics could always be gathered.
* This program has to run SUID to ROOT to access the ICMP socket.
*/
#include <sys/param.h> /* NB: we rely on this for <sys/types.h> */
#include <sys/capsicum.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <arpa/inet.h>
#include <libcasper.h>
#include <casper/cap_dns.h>
#ifdef IPSEC
#include <netipsec/ipsec.h>
#endif /*IPSEC*/
#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stddef.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#include "main.h"
#include "ping.h"
#include "utils.h"
#define INADDR_LEN ((int)sizeof(in_addr_t))
#define TIMEVAL_LEN ((int)sizeof(struct tv32))
#define MASK_LEN (ICMP_MASKLEN - ICMP_MINLEN)
#define TS_LEN (ICMP_TSLEN - ICMP_MINLEN)
#define DEFDATALEN 56 /* default data length */
#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */
/* runs out of buffer space */
#define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN)
#define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN)
#define MAXWAIT 10000 /* max ms to wait for response */
#define MAXALARM (60 * 60) /* max seconds for alarm timeout */
#define MAXTOS 255
#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))
struct tv32 {
int32_t tv32_sec;
int32_t tv32_nsec;
};
/* various options */
#define F_FLOOD 0x0001
#define F_INTERVAL 0x0002
#define F_PINGFILLED 0x0008
#define F_QUIET 0x0010
#define F_RROUTE 0x0020
#define F_SO_DEBUG 0x0040
#define F_SO_DONTROUTE 0x0080
#define F_VERBOSE 0x0100
#define F_QUIET2 0x0200
#define F_NOLOOP 0x0400
#define F_MTTL 0x0800
#define F_MIF 0x1000
#define F_AUDIBLE 0x2000
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
#define F_POLICY 0x4000
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
#define F_TTL 0x8000
#define F_MISSED 0x10000
#define F_ONCE 0x20000
#define F_HDRINCL 0x40000
#define F_MASK 0x80000
#define F_TIME 0x100000
#define F_SWEEP 0x200000
#define F_WAITTIME 0x400000
#define F_IP_VLAN_PCP 0x800000
#define F_DOT 0x1000000
/*
* MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
* number of received sequence numbers we can keep track of. Change 128
* to 8192 for complete accuracy...
*/
#define MAX_DUP_CHK (8 * 128)
static int mx_dup_ck = MAX_DUP_CHK;
static char rcvd_tbl[MAX_DUP_CHK / 8];
static struct sockaddr_in whereto; /* who to ping */
static int datalen = DEFDATALEN;
static int maxpayload;
static int ssend; /* send socket file descriptor */
static int srecv; /* receive socket file descriptor */
static u_char outpackhdr[IP_MAXPACKET], *outpack;
static char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */
static char BSPACE = '\b'; /* characters written for flood */
static const char *DOT = ".";
static size_t DOTlen = 1;
static size_t DOTidx = 0;
static char *shostname;
static int ident; /* process id to identify our packets */
static int uid; /* cached uid for micro-optimization */
static u_char icmp_type = ICMP_ECHO;
static u_char icmp_type_rsp = ICMP_ECHOREPLY;
static int phdr_len = 0;
static int send_len;
/* counters */
static long nmissedmax; /* max value of ntransmitted - nreceived - 1 */
static long npackets; /* max packets to transmit */
static long snpackets; /* max packets to transmit in one sweep */
static long sntransmitted; /* # of packets we sent in this sweep */
static int sweepmax; /* max value of payload in sweep */
static int sweepmin = 0; /* start value of payload in sweep */
static int sweepincr = 1; /* payload increment in sweep */
static int interval = 1000; /* interval between packets, ms */
static int waittime = MAXWAIT; /* timeout for each packet */
static cap_channel_t *capdns;
static void fill(char *, char *);
static cap_channel_t *capdns_setup(void);
static void pinger(void);
static char *pr_addr(struct in_addr);
static char *pr_ntime(n_time);
static void pr_icmph(struct icmp *, struct ip *, const u_char *const);
static void pr_iph(struct ip *, const u_char *);
static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *);
int
ping(int argc, char *const *argv)
{
struct sockaddr_in from, sock_in;
struct in_addr ifaddr;
struct timespec last, intvl;
struct iovec iov;
struct msghdr msg;
struct sigaction si_sa;
size_t sz;
u_char *datap, packet[IP_MAXPACKET] __aligned(4);
const char *errstr;
char *ep, *source, *target, *payload;
struct hostent *hp;
#ifdef IPSEC_POLICY_IPSEC
char *policy_in, *policy_out;
#endif
struct sockaddr_in *to;
double t;
u_long alarmtimeout;
long long ltmp;
int almost_done, ch, df, hold, i, icmp_len, mib[4], preload;
int ssend_errno, srecv_errno, tos, ttl, pcp;
char ctrl[CMSG_SPACE(sizeof(struct timespec))];
char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
#ifdef IP_OPTIONS
char rspace[MAX_IPOPTLEN]; /* record route space */
#endif
unsigned char loop, mttl;
payload = source = NULL;
#ifdef IPSEC_POLICY_IPSEC
policy_in = policy_out = NULL;
#endif
cap_rights_t rights;
/*
* Do the stuff that we need root priv's for *first*, and
* then drop our setuid bit. Save error reporting for
* after arg parsing.
*
* Historicaly ping was using one socket 's' for sending and for
* receiving. After capsicum(4) related changes we use two
* sockets. It was done for special ping use case - when user
* issue ping on multicast or broadcast address replies come
* from different addresses, not from the address we
* connect(2)'ed to, and send socket do not receive those
* packets.
*/
ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
ssend_errno = errno;
srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
srecv_errno = errno;
if (setuid(getuid()) != 0)
err(EX_NOPERM, "setuid() failed");
uid = getuid();
if (ssend < 0) {
errno = ssend_errno;
err(EX_OSERR, "ssend socket");
}
if (srecv < 0) {
errno = srecv_errno;
err(EX_OSERR, "srecv socket");
}
alarmtimeout = df = preload = tos = pcp = 0;
outpack = outpackhdr + sizeof(struct ip);
while ((ch = getopt(argc, argv, PING4OPTS)) != -1) {
switch(ch) {
case '.':
options |= F_DOT;
if (optarg != NULL) {
DOT = optarg;
DOTlen = strlen(optarg);
}
break;
case '4':
/* This option is processed in main(). */
break;
case 'A':
options |= F_MISSED;
break;
case 'a':
options |= F_AUDIBLE;
break;
case 'C':
options |= F_IP_VLAN_PCP;
ltmp = strtonum(optarg, -1, 7, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "invalid PCP: `%s'", optarg);
pcp = ltmp;
break;
case 'c':
ltmp = strtonum(optarg, 1, LONG_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE,
"invalid count of packets to transmit: `%s'",
optarg);
npackets = (long)ltmp;
break;
case 'D':
options |= F_HDRINCL;
df = 1;
break;
case 'd':
options |= F_SO_DEBUG;
break;
case 'f':
if (uid) {
errno = EPERM;
err(EX_NOPERM, "-f flag");
}
options |= F_FLOOD;
options |= F_DOT;
setbuf(stdout, (char *)NULL);
break;
case 'G': /* Maximum packet size for ping sweep */
ltmp = strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr != NULL) {
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
}
sweepmax = (int)ltmp;
if (uid != 0 && sweepmax > DEFDATALEN) {
errc(EX_NOPERM, EPERM,
"packet size too large: %d > %u",
sweepmax, DEFDATALEN);
}
options |= F_SWEEP;
break;
case 'g': /* Minimum packet size for ping sweep */
ltmp = strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr != NULL) {
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
}
sweepmin = (int)ltmp;
if (uid != 0 && sweepmin > DEFDATALEN) {
errc(EX_NOPERM, EPERM,
"packet size too large: %d > %u",
sweepmin, DEFDATALEN);
}
options |= F_SWEEP;
break;
case 'H':
options |= F_HOSTNAME;
break;
case 'h': /* Packet size increment for ping sweep */
ltmp = strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr != NULL) {
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
}
sweepincr = (int)ltmp;
if (uid != 0 && sweepincr > DEFDATALEN) {
errc(EX_NOPERM, EPERM,
"packet size too large: %d > %u",
sweepincr, DEFDATALEN);
}
options |= F_SWEEP;
break;
case 'I': /* multicast interface */
if (inet_aton(optarg, &ifaddr) == 0)
errx(EX_USAGE,
"invalid multicast interface: `%s'",
optarg);
options |= F_MIF;
break;
case 'i': /* wait between sending packets */
t = strtod(optarg, &ep) * 1000.0;
if (*ep || ep == optarg || t > (double)INT_MAX)
errx(EX_USAGE, "invalid timing interval: `%s'",
optarg);
options |= F_INTERVAL;
interval = (int)t;
if (uid && interval < 1000) {
errno = EPERM;
err(EX_NOPERM, "-i interval too short");
}
break;
case 'L':
options |= F_NOLOOP;
loop = 0;
break;
case 'l':
ltmp = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE,
"invalid preload value: `%s'", optarg);
if (uid) {
errno = EPERM;
err(EX_NOPERM, "-l flag");
}
preload = (int)ltmp;
break;
case 'M':
switch(optarg[0]) {
case 'M':
case 'm':
options |= F_MASK;
break;
case 'T':
case 't':
options |= F_TIME;
break;
default:
errx(EX_USAGE, "invalid message: `%c'", optarg[0]);
break;
}
break;
case 'm': /* TTL */
ltmp = strtonum(optarg, 0, MAXTTL, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "invalid TTL: `%s'", optarg);
ttl = (int)ltmp;
options |= F_TTL;
break;
case 'n':
options &= ~F_HOSTNAME;
break;
case 'o':
options |= F_ONCE;
break;
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
case 'P':
options |= F_POLICY;
if (!strncmp("in", optarg, 2))
policy_in = strdup(optarg);
else if (!strncmp("out", optarg, 3))
policy_out = strdup(optarg);
else
errx(1, "invalid security policy");
break;
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
case 'p': /* fill buffer with user pattern */
options |= F_PINGFILLED;
payload = optarg;
break;
case 'Q':
options |= F_QUIET2;
break;
case 'q':
options |= F_QUIET;
break;
case 'R':
options |= F_RROUTE;
break;
case 'r':
options |= F_SO_DONTROUTE;
break;
case 'S':
source = optarg;
break;
case 's': /* size of packet to send */
ltmp = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
datalen = (int)ltmp;
if (uid != 0 && datalen > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %d > %u",
datalen, DEFDATALEN);
}
break;
case 'T': /* multicast TTL */
ltmp = strtonum(optarg, 0, MAXTTL, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "invalid multicast TTL: `%s'",
optarg);
mttl = (unsigned char)ltmp;
options |= F_MTTL;
break;
case 't':
alarmtimeout = strtoul(optarg, &ep, 0);
if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
errx(EX_USAGE, "invalid timeout: `%s'",
optarg);
if (alarmtimeout > MAXALARM)
errx(EX_USAGE, "invalid timeout: `%s' > %d",
optarg, MAXALARM);
{
struct itimerval itv;
timerclear(&itv.it_interval);
timerclear(&itv.it_value);
itv.it_value.tv_sec = (time_t)alarmtimeout;
if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
err(1, "setitimer");
}
break;
case 'v':
options |= F_VERBOSE;
break;
case 'W': /* wait ms for answer */
t = strtod(optarg, &ep);
if (*ep || ep == optarg || t > (double)INT_MAX)
errx(EX_USAGE, "invalid timing interval: `%s'",
optarg);
options |= F_WAITTIME;
waittime = (int)t;
break;
case 'z':
options |= F_HDRINCL;
ltmp = strtol(optarg, &ep, 0);
if (*ep || ep == optarg || ltmp > MAXTOS || ltmp < 0)
errx(EX_USAGE, "invalid TOS: `%s'", optarg);
tos = ltmp;
break;
default:
usage();
}
}
if (argc - optind != 1)
usage();
target = argv[optind];
switch (options & (F_MASK|F_TIME)) {
case 0: break;
case F_MASK:
icmp_type = ICMP_MASKREQ;
icmp_type_rsp = ICMP_MASKREPLY;
phdr_len = MASK_LEN;
if (!(options & F_QUIET))
(void)printf("ICMP_MASKREQ\n");
break;
case F_TIME:
icmp_type = ICMP_TSTAMP;
icmp_type_rsp = ICMP_TSTAMPREPLY;
phdr_len = TS_LEN;
if (!(options & F_QUIET))
(void)printf("ICMP_TSTAMP\n");
break;
default:
errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
break;
}
icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
if (options & F_RROUTE)
icmp_len += MAX_IPOPTLEN;
maxpayload = IP_MAXPACKET - icmp_len;
if (datalen > maxpayload)
errx(EX_USAGE, "packet size too large: %d > %d", datalen,
maxpayload);
send_len = icmp_len + datalen;
datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
if (options & F_PINGFILLED) {
fill((char *)datap, payload);
}
capdns = capdns_setup();
if (source) {
bzero((char *)&sock_in, sizeof(sock_in));
sock_in.sin_family = AF_INET;
if (inet_aton(source, &sock_in.sin_addr) != 0) {
shostname = source;
} else {
hp = cap_gethostbyname2(capdns, source, AF_INET);
if (!hp)
errx(EX_NOHOST, "cannot resolve %s: %s",
source, hstrerror(h_errno));
sock_in.sin_len = sizeof sock_in;
if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
hp->h_length < 0)
errx(1, "gethostbyname2: illegal address");
memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
sizeof(sock_in.sin_addr));
(void)strncpy(snamebuf, hp->h_name,
sizeof(snamebuf) - 1);
snamebuf[sizeof(snamebuf) - 1] = '\0';
shostname = snamebuf;
}
if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) ==
-1)
err(1, "bind");
}
bzero(&whereto, sizeof(whereto));
to = &whereto;
to->sin_family = AF_INET;
to->sin_len = sizeof *to;
if (inet_aton(target, &to->sin_addr) != 0) {
hostname = target;
} else {
hp = cap_gethostbyname2(capdns, target, AF_INET);
if (!hp)
errx(EX_NOHOST, "cannot resolve %s: %s",
target, hstrerror(h_errno));
if ((unsigned)hp->h_length > sizeof(to->sin_addr))
errx(1, "gethostbyname2 returned an illegal address");
memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
(void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
hnamebuf[sizeof(hnamebuf) - 1] = '\0';
hostname = hnamebuf;
}
/* From now on we will use only reverse DNS lookups. */
#ifdef WITH_CASPER
if (capdns != NULL) {
const char *types[1];
types[0] = "ADDR2NAME";
if (cap_dns_type_limit(capdns, types, 1) < 0)
err(1, "unable to limit access to system.dns service");
}
#endif
if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0)
err(1, "connect");
if (options & F_FLOOD && options & F_INTERVAL)
errx(EX_USAGE, "-f and -i: incompatible options");
if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
errx(EX_USAGE,
"-f flag cannot be used with multicast destination");
if (options & (F_MIF | F_NOLOOP | F_MTTL)
&& !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
errx(EX_USAGE,
"-I, -L, -T flags cannot be used with unicast destination");
if (datalen >= TIMEVAL_LEN) /* can we time transfer */
timing = 1;
if ((options & (F_PINGFILLED | F_SWEEP)) == 0)
for (i = TIMEVAL_LEN; i < datalen; ++i)
*datap++ = i;
ident = getpid() & 0xFFFF;
hold = 1;
if (options & F_SO_DEBUG) {
(void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
sizeof(hold));
(void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
sizeof(hold));
}
if (options & F_SO_DONTROUTE)
(void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
sizeof(hold));
if (options & F_IP_VLAN_PCP) {
(void)setsockopt(ssend, IPPROTO_IP, IP_VLAN_PCP, (char *)&pcp,
sizeof(pcp));
}
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
if (options & F_POLICY) {
char *buf;
if (policy_in != NULL) {
buf = ipsec_set_policy(policy_in, strlen(policy_in));
if (buf == NULL)
errx(EX_CONFIG, "%s", ipsec_strerror());
if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY,
buf, ipsec_get_policylen(buf)) < 0)
err(EX_CONFIG,
"ipsec policy cannot be configured");
free(buf);
}
if (policy_out != NULL) {
buf = ipsec_set_policy(policy_out, strlen(policy_out));
if (buf == NULL)
errx(EX_CONFIG, "%s", ipsec_strerror());
if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY,
buf, ipsec_get_policylen(buf)) < 0)
err(EX_CONFIG,
"ipsec policy cannot be configured");
free(buf);
}
}
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
if (options & F_HDRINCL) {
struct ip ip;
memcpy(&ip, outpackhdr, sizeof(ip));
if (!(options & (F_TTL | F_MTTL))) {
mib[0] = CTL_NET;
mib[1] = PF_INET;
mib[2] = IPPROTO_IP;
mib[3] = IPCTL_DEFTTL;
sz = sizeof(ttl);
if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
err(1, "sysctl(net.inet.ip.ttl)");
}
setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
ip.ip_v = IPVERSION;
ip.ip_hl = sizeof(struct ip) >> 2;
ip.ip_tos = tos;
ip.ip_id = 0;
ip.ip_off = htons(df ? IP_DF : 0);
ip.ip_ttl = ttl;
ip.ip_p = IPPROTO_ICMP;
ip.ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
ip.ip_dst = to->sin_addr;
memcpy(outpackhdr, &ip, sizeof(ip));
}
/*
* Here we enter capability mode. Further down access to global
* namespaces (e.g filesystem) is restricted (see capsicum(4)).
* We must connect(2) our socket before this point.
*/
caph_cache_catpages();
if (caph_enter_casper() < 0)
err(1, "caph_enter_casper");
cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
if (caph_rights_limit(srecv, &rights) < 0)
err(1, "cap_rights_limit srecv");
cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT);
if (caph_rights_limit(ssend, &rights) < 0)
err(1, "cap_rights_limit ssend");
/* record route option */
if (options & F_RROUTE) {
#ifdef IP_OPTIONS
bzero(rspace, sizeof(rspace));
rspace[IPOPT_OPTVAL] = IPOPT_RR;
rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
rspace[sizeof(rspace) - 1] = IPOPT_EOL;
if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace,
sizeof(rspace)) < 0)
err(EX_OSERR, "setsockopt IP_OPTIONS");
#else
errx(EX_UNAVAILABLE,
"record route not available in this implementation");
#endif /* IP_OPTIONS */
}
if (options & F_TTL) {
if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl,
sizeof(ttl)) < 0) {
err(EX_OSERR, "setsockopt IP_TTL");
}
}
if (options & F_NOLOOP) {
if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
sizeof(loop)) < 0) {
err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
}
}
if (options & F_MTTL) {
if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
sizeof(mttl)) < 0) {
err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
}
}
if (options & F_MIF) {
if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
sizeof(ifaddr)) < 0) {
err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
}
}
#ifdef SO_TIMESTAMP
{
int on = 1;
int ts_clock = SO_TS_MONOTONIC;
if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on,
sizeof(on)) < 0)
err(EX_OSERR, "setsockopt SO_TIMESTAMP");
if (setsockopt(srecv, SOL_SOCKET, SO_TS_CLOCK, &ts_clock,
sizeof(ts_clock)) < 0)
err(EX_OSERR, "setsockopt SO_TS_CLOCK");
}
#endif
if (sweepmax) {
if (sweepmin > sweepmax)
errx(EX_USAGE,
"Maximum packet size must be no less than the minimum packet size");
if (sweepmax > maxpayload - TIMEVAL_LEN)
errx(EX_USAGE, "Invalid sweep maximum");
if (datalen != DEFDATALEN)
errx(EX_USAGE,
"Packet size and ping sweep are mutually exclusive");
if (npackets > 0) {
snpackets = npackets;
npackets = 0;
} else
snpackets = 1;
datalen = sweepmin;
send_len = icmp_len + sweepmin;
}
if (options & F_SWEEP && !sweepmax)
errx(EX_USAGE, "Maximum sweep size must be specified");
/*
* When pinging the broadcast address, you can get a lot of answers.
* Doing something so evil is useful if you are trying to stress the
* ethernet, or just want to fill the arp cache to get some stuff for
* /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast
* or multicast pings if they wish.
*/
/*
* XXX receive buffer needs undetermined space for mbuf overhead
* as well.
*/
hold = IP_MAXPACKET + 128;
(void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
sizeof(hold));
/* CAP_SETSOCKOPT removed */
cap_rights_init(&rights, CAP_RECV, CAP_EVENT);
if (caph_rights_limit(srecv, &rights) < 0)
err(1, "cap_rights_limit srecv setsockopt");
if (uid == 0)
(void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
sizeof(hold));
/* CAP_SETSOCKOPT removed */
cap_rights_init(&rights, CAP_SEND);
if (caph_rights_limit(ssend, &rights) < 0)
err(1, "cap_rights_limit ssend setsockopt");
if (to->sin_family == AF_INET) {
(void)printf("PING %s (%s)", hostname,
inet_ntoa(to->sin_addr));
if (source)
(void)printf(" from %s", shostname);
if (sweepmax)
(void)printf(": (%d ... %d) data bytes\n",
sweepmin, sweepmax);
else
(void)printf(": %d data bytes\n", datalen);
} else {
if (sweepmax)
(void)printf("PING %s: (%d ... %d) data bytes\n",
hostname, sweepmin, sweepmax);
else
(void)printf("PING %s: %d data bytes\n", hostname, datalen);
}
/*
* Use sigaction() instead of signal() to get unambiguous semantics,
* in particular with SA_RESTART not set.
*/
sigemptyset(&si_sa.sa_mask);
si_sa.sa_flags = 0;
si_sa.sa_handler = onsignal;
if (sigaction(SIGINT, &si_sa, 0) == -1)
err(EX_OSERR, "sigaction SIGINT");
seenint = 0;
if (sigaction(SIGINFO, &si_sa, 0) == -1)
err(EX_OSERR, "sigaction SIGINFO");
seeninfo = 0;
if (alarmtimeout > 0) {
if (sigaction(SIGALRM, &si_sa, 0) == -1)
err(EX_OSERR, "sigaction SIGALRM");
}
bzero(&msg, sizeof(msg));
msg.msg_name = (caddr_t)&from;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
#ifdef SO_TIMESTAMP
msg.msg_control = (caddr_t)ctrl;
msg.msg_controllen = sizeof(ctrl);
#endif
iov.iov_base = packet;
iov.iov_len = IP_MAXPACKET;
if (preload == 0)
pinger(); /* send the first ping */
else {
if (npackets != 0 && preload > npackets)
preload = npackets;
while (preload--) /* fire off them quickies */
pinger();
}
(void)clock_gettime(CLOCK_MONOTONIC, &last);
if (options & F_FLOOD) {
intvl.tv_sec = 0;
intvl.tv_nsec = 10000000;
} else {
intvl.tv_sec = interval / 1000;
intvl.tv_nsec = interval % 1000 * 1000000;
}
almost_done = 0;
while (seenint == 0) {
struct timespec now, timeout;
fd_set rfds;
int n;
ssize_t cc;
/* signal handling */
if (seeninfo) {
pr_summary(stderr);
seeninfo = 0;
continue;
}
if ((unsigned)srecv >= FD_SETSIZE)
errx(EX_OSERR, "descriptor too large");
FD_ZERO(&rfds);
FD_SET(srecv, &rfds);
(void)clock_gettime(CLOCK_MONOTONIC, &now);
timespecadd(&last, &intvl, &timeout);
timespecsub(&timeout, &now, &timeout);
if (timeout.tv_sec < 0)
timespecclear(&timeout);
n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL);
if (n < 0)
continue; /* EINTR */
if (n == 1) {
struct timespec *tv = NULL;
#ifdef SO_TIMESTAMP
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
#endif
msg.msg_namelen = sizeof(from);
if ((cc = recvmsg(srecv, &msg, 0)) < 0) {
if (errno == EINTR)
continue;
warn("recvmsg");
continue;
}
/* If we have a 0 byte read from recvfrom continue */
if (cc == 0)
continue;
#ifdef SO_TIMESTAMP
if (cmsg != NULL &&
cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_TIMESTAMP &&
cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
/* Copy to avoid alignment problems: */
memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
tv = &now;
}
#endif
if (tv == NULL) {
(void)clock_gettime(CLOCK_MONOTONIC, &now);
tv = &now;
}
pr_pack((char *)packet, cc, &from, tv);
if ((options & F_ONCE && nreceived) ||
(npackets && nreceived >= npackets))
break;
}
if (n == 0 || (options & F_FLOOD)) {
if (sweepmax && sntransmitted == snpackets) {
if (datalen + sweepincr > sweepmax)
break;
for (i = 0; i < sweepincr; i++)
*datap++ = i;
datalen += sweepincr;
send_len = icmp_len + datalen;
sntransmitted = 0;
}
if (!npackets || ntransmitted < npackets)
pinger();
else {
if (almost_done)
break;
almost_done = 1;
/*
* If we're not transmitting any more packets,
* change the timer to wait two round-trip times
* if we've received any packets or (waittime)
* milliseconds if we haven't.
*/
intvl.tv_nsec = 0;
if (nreceived) {
intvl.tv_sec = 2 * tmax / 1000;
if (intvl.tv_sec == 0)
intvl.tv_sec = 1;
} else {
intvl.tv_sec = waittime / 1000;
intvl.tv_nsec =
waittime % 1000 * 1000000;
}
}
(void)clock_gettime(CLOCK_MONOTONIC, &last);
if (ntransmitted - nreceived - 1 > nmissedmax) {
nmissedmax = ntransmitted - nreceived - 1;
if (options & F_MISSED)
(void)write(STDOUT_FILENO, &BBELL, 1);
}
}
}
pr_summary(stdout);
exit(nreceived ? 0 : 2);
}
/*
* pinger --
* Compose and transmit an ICMP ECHO REQUEST packet. The IP packet
* will be added on by the kernel. The ID field is our UNIX process ID,
* and the sequence number is an ascending integer. The first TIMEVAL_LEN
* bytes of the data portion are used to hold a UNIX "timespec" struct in
* host byte-order, to compute the round-trip time.
*/
static void
pinger(void)
{
struct timespec now;
struct tv32 tv32;
struct icmp icp;
int cc, i;
u_char *packet;
packet = outpack;
memcpy(&icp, outpack, ICMP_MINLEN + phdr_len);
icp.icmp_type = icmp_type;
icp.icmp_code = 0;
icp.icmp_cksum = 0;
icp.icmp_seq = htons(ntransmitted);
icp.icmp_id = ident; /* ID */
CLR(ntransmitted % mx_dup_ck);
if ((options & F_TIME) || timing) {
(void)clock_gettime(CLOCK_MONOTONIC, &now);
/*
* Truncate seconds down to 32 bits in order
* to fit the timestamp within 8 bytes of the
* packet. We're only concerned with
* durations, not absolute times.
*/
tv32.tv32_sec = (uint32_t)htonl(now.tv_sec);
tv32.tv32_nsec = (uint32_t)htonl(now.tv_nsec);
if (options & F_TIME)
icp.icmp_otime = htonl((now.tv_sec % (24*60*60))
* 1000 + now.tv_nsec / 1000000);
if (timing)
bcopy((void *)&tv32,
(void *)&outpack[ICMP_MINLEN + phdr_len],
sizeof(tv32));
}
memcpy(outpack, &icp, ICMP_MINLEN + phdr_len);
cc = ICMP_MINLEN + phdr_len + datalen;
/* compute ICMP checksum here */
icp.icmp_cksum = in_cksum(outpack, cc);
/* Update icmp_cksum in the raw packet data buffer. */
memcpy(outpack + offsetof(struct icmp, icmp_cksum), &icp.icmp_cksum,
sizeof(icp.icmp_cksum));
if (options & F_HDRINCL) {
struct ip ip;
cc += sizeof(struct ip);
ip.ip_len = htons(cc);
/* Update ip_len in the raw packet data buffer. */
memcpy(outpackhdr + offsetof(struct ip, ip_len), &ip.ip_len,
sizeof(ip.ip_len));
ip.ip_sum = in_cksum(outpackhdr, cc);
/* Update ip_sum in the raw packet data buffer. */
memcpy(outpackhdr + offsetof(struct ip, ip_sum), &ip.ip_sum,
sizeof(ip.ip_sum));
packet = outpackhdr;
}
i = send(ssend, (char *)packet, cc, 0);
if (i < 0 || i != cc) {
if (i < 0) {
if (options & F_FLOOD && errno == ENOBUFS) {
usleep(FLOOD_BACKOFF);
return;
}
warn("sendto");
} else {
warn("%s: partial write: %d of %d bytes",
hostname, i, cc);
}
}
ntransmitted++;
sntransmitted++;
if (!(options & F_QUIET) && options & F_DOT)
(void)write(STDOUT_FILENO, &DOT[DOTidx++ % DOTlen], 1);
}
/*
* pr_pack --
* Print out the packet, if it came from us. This logic is necessary
* because ALL readers of the ICMP socket get a copy of ALL ICMP packets
* which arrive ('tis only fair). This permits multiple copies of this
* program to be run without having intermingled output (or statistics!).
*/
static void
pr_pack(char *buf, ssize_t cc, struct sockaddr_in *from, struct timespec *tv)
{
struct in_addr ina;
u_char *cp, *dp, l;
struct icmp icp;
struct ip ip;
const u_char *icmp_data_raw;
ssize_t icmp_data_raw_len;
double triptime;
int dupflag, i, j, recv_len;
int8_t hlen;
uint16_t seq;
static int old_rrlen;
static char old_rr[MAX_IPOPTLEN];
struct ip oip;
u_char oip_header_len;
struct icmp oicmp;
const u_char *oicmp_raw;
/*
* Get size of IP header of the received packet.
* The header length is contained in the lower four bits of the first
* byte and represents the number of 4 byte octets the header takes up.
*
* The IHL minimum value is 5 (20 bytes) and its maximum value is 15
* (60 bytes).
*/
memcpy(&l, buf, sizeof(l));
hlen = (l & 0x0f) << 2;
/* Reject IP packets with a short header */
if (hlen < (int8_t) sizeof(struct ip)) {
if (options & F_VERBOSE)
warn("IHL too short (%d bytes) from %s", hlen,
inet_ntoa(from->sin_addr));
return;
}
memcpy(&ip, buf, sizeof(struct ip));
/* Check packet has enough data to carry a valid ICMP header */
recv_len = cc;
if (cc < hlen + ICMP_MINLEN) {
if (options & F_VERBOSE)
warn("packet too short (%zd bytes) from %s", cc,
inet_ntoa(from->sin_addr));
return;
}
icmp_data_raw_len = cc - (hlen + offsetof(struct icmp, icmp_data));
icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_data);
/* Now the ICMP part */
cc -= hlen;
memcpy(&icp, buf + hlen, MIN((ssize_t)sizeof(icp), cc));
if (icp.icmp_type == icmp_type_rsp) {
if (icp.icmp_id != ident)
return; /* 'Twas not our ECHO */
++nreceived;
triptime = 0.0;
if (timing) {
struct timespec tv1;
struct tv32 tv32;
const u_char *tp;
tp = icmp_data_raw + phdr_len;
if ((size_t)(cc - ICMP_MINLEN - phdr_len) >=
sizeof(tv1)) {
/* Copy to avoid alignment problems: */
memcpy(&tv32, tp, sizeof(tv32));
tv1.tv_sec = ntohl(tv32.tv32_sec);
tv1.tv_nsec = ntohl(tv32.tv32_nsec);
timespecsub(tv, &tv1, tv);
triptime = ((double)tv->tv_sec) * 1000.0 +
((double)tv->tv_nsec) / 1000000.0;
if (triptime < 0) {
warnx("time of day goes back (%.3f ms),"
" clamping time to 0",
triptime);
triptime = 0;
}
tsum += triptime;
tsumsq += triptime * triptime;
if (triptime < tmin)
tmin = triptime;
if (triptime > tmax)
tmax = triptime;
} else
timing = 0;
}
seq = ntohs(icp.icmp_seq);
if (TST(seq % mx_dup_ck)) {
++nrepeats;
--nreceived;
dupflag = 1;
} else {
SET(seq % mx_dup_ck);
dupflag = 0;
}
if (options & F_QUIET)
return;
if (options & F_WAITTIME && triptime > waittime) {
++nrcvtimeout;
return;
}
if (options & F_DOT)
(void)write(STDOUT_FILENO, &BSPACE, 1);
else {
(void)printf("%zd bytes from %s: icmp_seq=%u", cc,
pr_addr(from->sin_addr), seq);
(void)printf(" ttl=%d", ip.ip_ttl);
if (timing)
(void)printf(" time=%.3f ms", triptime);
if (dupflag)
(void)printf(" (DUP!)");
if (options & F_AUDIBLE)
(void)write(STDOUT_FILENO, &BBELL, 1);
if (options & F_MASK) {
/* Just prentend this cast isn't ugly */
(void)printf(" mask=%s",
inet_ntoa(*(struct in_addr *)&(icp.icmp_mask)));
}
if (options & F_TIME) {
(void)printf(" tso=%s", pr_ntime(icp.icmp_otime));
(void)printf(" tsr=%s", pr_ntime(icp.icmp_rtime));
(void)printf(" tst=%s", pr_ntime(icp.icmp_ttime));
}
if (recv_len != send_len) {
(void)printf(
"\nwrong total length %d instead of %d",
recv_len, send_len);
}
/* check the data */
cp = (u_char*)(buf + hlen + offsetof(struct icmp,
icmp_data) + phdr_len);
dp = &outpack[ICMP_MINLEN + phdr_len];
cc -= ICMP_MINLEN + phdr_len;
i = 0;
if (timing) { /* don't check variable timestamp */
cp += TIMEVAL_LEN;
dp += TIMEVAL_LEN;
cc -= TIMEVAL_LEN;
i += TIMEVAL_LEN;
}
for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
if (*cp != *dp) {
(void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
i, *dp, *cp);
(void)printf("\ncp:");
cp = (u_char*)(buf + hlen +
offsetof(struct icmp, icmp_data));
for (i = 0; i < datalen; ++i, ++cp) {
if ((i % 16) == 8)
(void)printf("\n\t");
(void)printf(" %2x", *cp);
}
(void)printf("\ndp:");
cp = &outpack[ICMP_MINLEN];
for (i = 0; i < datalen; ++i, ++cp) {
if ((i % 16) == 8)
(void)printf("\n\t");
(void)printf(" %2x", *cp);
}
break;
}
}
}
} else {
/*
* We've got something other than an ECHOREPLY.
* See if it's a reply to something that we sent.
* We can compare IP destination, protocol,
* and ICMP type and ID.
*
* Only print all the error messages if we are running
* as root to avoid leaking information not normally
* available to those not running as root.
*/
/*
* If we don't have enough bytes for a quoted IP header and an
* ICMP header then stop.
*/
if (icmp_data_raw_len <
(ssize_t)(sizeof(struct ip) + sizeof(struct icmp))) {
if (options & F_VERBOSE)
warnx("quoted data too short (%zd bytes) from %s",
icmp_data_raw_len, inet_ntoa(from->sin_addr));
return;
}
memcpy(&oip_header_len, icmp_data_raw, sizeof(oip_header_len));
oip_header_len = (oip_header_len & 0x0f) << 2;
/* Reject IP packets with a short header */
if (oip_header_len < sizeof(struct ip)) {
if (options & F_VERBOSE)
warnx("inner IHL too short (%d bytes) from %s",
oip_header_len, inet_ntoa(from->sin_addr));
return;
}
/*
* Check against the actual IHL length, to protect against
* quoated packets carrying IP options.
*/
if (icmp_data_raw_len <
(ssize_t)(oip_header_len + sizeof(struct icmp))) {
if (options & F_VERBOSE)
warnx("inner packet too short (%zd bytes) from %s",
icmp_data_raw_len, inet_ntoa(from->sin_addr));
return;
}
memcpy(&oip, icmp_data_raw, sizeof(struct ip));
oicmp_raw = icmp_data_raw + oip_header_len;
memcpy(&oicmp, oicmp_raw, sizeof(struct icmp));
if (((options & F_VERBOSE) && uid == 0) ||
(!(options & F_QUIET2) &&
(oip.ip_dst.s_addr == whereto.sin_addr.s_addr) &&
(oip.ip_p == IPPROTO_ICMP) &&
(oicmp.icmp_type == ICMP_ECHO) &&
(oicmp.icmp_id == ident))) {
(void)printf("%zd bytes from %s: ", cc,
pr_addr(from->sin_addr));
pr_icmph(&icp, &oip, icmp_data_raw);
} else
return;
}
/* Display any IP options */
cp = (u_char *)buf + sizeof(struct ip);
for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
switch (*cp) {
case IPOPT_EOL:
hlen = 0;
break;
case IPOPT_LSRR:
case IPOPT_SSRR:
(void)printf(*cp == IPOPT_LSRR ?
"\nLSRR: " : "\nSSRR: ");
j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
hlen -= 2;
cp += 2;
if (j >= INADDR_LEN &&
j <= hlen - (int)sizeof(struct ip)) {
for (;;) {
bcopy(++cp, &ina.s_addr, INADDR_LEN);
if (ina.s_addr == 0)
(void)printf("\t0.0.0.0");
else
(void)printf("\t%s",
pr_addr(ina));
hlen -= INADDR_LEN;
cp += INADDR_LEN - 1;
j -= INADDR_LEN;
if (j < INADDR_LEN)
break;
(void)putchar('\n');
}
} else
(void)printf("\t(truncated route)");
break;
case IPOPT_RR:
j = cp[IPOPT_OLEN]; /* get length */
i = cp[IPOPT_OFFSET]; /* and pointer */
hlen -= 2;
cp += 2;
if (i > j)
i = j;
i = i - IPOPT_MINOFF + 1;
if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
old_rrlen = 0;
continue;
}
if (i == old_rrlen
&& !bcmp((char *)cp, old_rr, i)
&& !(options & F_DOT)) {
(void)printf("\t(same route)");
hlen -= i;
cp += i;
break;
}
old_rrlen = i;
bcopy((char *)cp, old_rr, i);
(void)printf("\nRR: ");
if (i >= INADDR_LEN &&
i <= hlen - (int)sizeof(struct ip)) {
for (;;) {
bcopy(++cp, &ina.s_addr, INADDR_LEN);
if (ina.s_addr == 0)
(void)printf("\t0.0.0.0");
else
(void)printf("\t%s",
pr_addr(ina));
hlen -= INADDR_LEN;
cp += INADDR_LEN - 1;
i -= INADDR_LEN;
if (i < INADDR_LEN)
break;
(void)putchar('\n');
}
} else
(void)printf("\t(truncated route)");
break;
case IPOPT_NOP:
(void)printf("\nNOP");
break;
default:
(void)printf("\nunknown option %x", *cp);
break;
}
if (!(options & F_DOT)) {
(void)putchar('\n');
(void)fflush(stdout);
}
}
/*
* pr_icmph --
* Print a descriptive string about an ICMP header.
*/
static void
pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw)
{
switch(icp->icmp_type) {
case ICMP_ECHOREPLY:
(void)printf("Echo Reply\n");
/* XXX ID + Seq + Data */
break;
case ICMP_UNREACH:
switch(icp->icmp_code) {
case ICMP_UNREACH_NET:
(void)printf("Destination Net Unreachable\n");
break;
case ICMP_UNREACH_HOST:
(void)printf("Destination Host Unreachable\n");
break;
case ICMP_UNREACH_PROTOCOL:
(void)printf("Destination Protocol Unreachable\n");
break;
case ICMP_UNREACH_PORT:
(void)printf("Destination Port Unreachable\n");
break;
case ICMP_UNREACH_NEEDFRAG:
(void)printf("frag needed and DF set (MTU %d)\n",
ntohs(icp->icmp_nextmtu));
break;
case ICMP_UNREACH_SRCFAIL:
(void)printf("Source Route Failed\n");
break;
case ICMP_UNREACH_FILTER_PROHIB:
(void)printf("Communication prohibited by filter\n");
break;
default:
(void)printf("Dest Unreachable, Bad Code: %d\n",
icp->icmp_code);
break;
}
/* Print returned IP header information */
pr_iph(oip, oicmp_raw);
break;
case ICMP_SOURCEQUENCH:
(void)printf("Source Quench\n");
pr_iph(oip, oicmp_raw);
break;
case ICMP_REDIRECT:
switch(icp->icmp_code) {
case ICMP_REDIRECT_NET:
(void)printf("Redirect Network");
break;
case ICMP_REDIRECT_HOST:
(void)printf("Redirect Host");
break;
case ICMP_REDIRECT_TOSNET:
(void)printf("Redirect Type of Service and Network");
break;
case ICMP_REDIRECT_TOSHOST:
(void)printf("Redirect Type of Service and Host");
break;
default:
(void)printf("Redirect, Bad Code: %d", icp->icmp_code);
break;
}
(void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
pr_iph(oip, oicmp_raw);
break;
case ICMP_ECHO:
(void)printf("Echo Request\n");
/* XXX ID + Seq + Data */
break;
case ICMP_TIMXCEED:
switch(icp->icmp_code) {
case ICMP_TIMXCEED_INTRANS:
(void)printf("Time to live exceeded\n");
break;
case ICMP_TIMXCEED_REASS:
(void)printf("Frag reassembly time exceeded\n");
break;
default:
(void)printf("Time exceeded, Bad Code: %d\n",
icp->icmp_code);
break;
}
pr_iph(oip, oicmp_raw);
break;
case ICMP_PARAMPROB:
(void)printf("Parameter problem: pointer = 0x%02x\n",
icp->icmp_hun.ih_pptr);
pr_iph(oip, oicmp_raw);
break;
case ICMP_TSTAMP:
(void)printf("Timestamp\n");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_TSTAMPREPLY:
(void)printf("Timestamp Reply\n");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_IREQ:
(void)printf("Information Request\n");
/* XXX ID + Seq */
break;
case ICMP_IREQREPLY:
(void)printf("Information Reply\n");
/* XXX ID + Seq */
break;
case ICMP_MASKREQ:
(void)printf("Address Mask Request\n");
break;
case ICMP_MASKREPLY:
(void)printf("Address Mask Reply\n");
break;
case ICMP_ROUTERADVERT:
(void)printf("Router Advertisement\n");
break;
case ICMP_ROUTERSOLICIT:
(void)printf("Router Solicitation\n");
break;
default:
(void)printf("Bad ICMP type: %d\n", icp->icmp_type);
}
}
/*
* pr_iph --
* Print an IP header with options.
*/
static void
pr_iph(struct ip *ip, const u_char *cp)
{
struct in_addr dst_ina, src_ina;
int hlen;
hlen = ip->ip_hl << 2;
cp = cp + sizeof(struct ip); /* point to options */
memcpy(&src_ina, &ip->ip_src.s_addr, sizeof(src_ina));
memcpy(&dst_ina, &ip->ip_dst.s_addr, sizeof(dst_ina));
(void)printf("Vr HL TOS Len ID Flg off TTL Pro cks %*s %*s",
(int)strlen(inet_ntoa(src_ina)), "Src",
(int)strlen(inet_ntoa(dst_ina)), "Dst");
if (hlen > (int)sizeof(struct ip))
(void)printf(" Opts");
(void)putchar('\n');
(void)printf(" %1x %1x %02x %04x %04x",
ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
ntohs(ip->ip_id));
(void)printf(" %1x %04x",
(ntohs(ip->ip_off) & 0xe000) >> 13,
ntohs(ip->ip_off) & 0x1fff);
(void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
ntohs(ip->ip_sum));
(void)printf(" %s", inet_ntoa(src_ina));
(void)printf(" %s", inet_ntoa(dst_ina));
/* dump any option bytes */
if (hlen > (int)sizeof(struct ip)) {
(void)printf(" ");
while (hlen-- > (int)sizeof(struct ip)) {
(void)printf("%02x", *cp++);
}
}
(void)putchar('\n');
}
/*
* pr_addr --
* Return an ascii host address as a dotted quad and optionally with
* a hostname.
*/
static char *
pr_addr(struct in_addr ina)
{
struct hostent *hp;
static char buf[16 + 3 + MAXHOSTNAMELEN];
if (!(options & F_HOSTNAME))
return inet_ntoa(ina);
hp = cap_gethostbyaddr(capdns, (char *)&ina, sizeof(ina), AF_INET);
if (hp == NULL)
return inet_ntoa(ina);
(void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
inet_ntoa(ina));
return(buf);
}
static char *
pr_ntime(n_time timestamp)
{
static char buf[11];
int hour, min, sec;
sec = ntohl(timestamp) / 1000;
hour = sec / 60 / 60;
min = (sec % (60 * 60)) / 60;
sec = (sec % (60 * 60)) % 60;
(void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
return (buf);
}
static void
fill(char *bp, char *patp)
{
char *cp;
int pat[16];
u_int ii, jj, kk;
for (cp = patp; *cp; cp++) {
if (!isxdigit(*cp))
errx(EX_USAGE,
"patterns must be specified as hex digits");
}
ii = sscanf(patp,
"%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
&pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
&pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
&pat[13], &pat[14], &pat[15]);
if (ii > 0)
for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
for (jj = 0; jj < ii; ++jj)
bp[jj + kk] = pat[jj];
if (!(options & F_QUIET)) {
(void)printf("PATTERN: 0x");
for (jj = 0; jj < ii; ++jj)
(void)printf("%02x", bp[jj] & 0xFF);
(void)printf("\n");
}
}
static cap_channel_t *
capdns_setup(void)
{
cap_channel_t *capcas, *capdnsloc;
#ifdef WITH_CASPER
const char *types[2];
int families[1];
#endif
capcas = cap_init();
if (capcas == NULL)
err(1, "unable to create casper process");
capdnsloc = cap_service_open(capcas, "system.dns");
/* Casper capability no longer needed. */
cap_close(capcas);
if (capdnsloc == NULL)
err(1, "unable to open system.dns service");
#ifdef WITH_CASPER
types[0] = "NAME2ADDR";
types[1] = "ADDR2NAME";
if (cap_dns_type_limit(capdnsloc, types, 2) < 0)
err(1, "unable to limit access to system.dns service");
families[0] = AF_INET;
if (cap_dns_family_limit(capdnsloc, families, 1) < 0)
err(1, "unable to limit access to system.dns service");
#endif
return (capdnsloc);
}
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