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49133c6d52
freebsd/sbin/ping/ping.c
Pawel Jakub Dawidek 49133c6d52 Protect ping(8) using Capsicum and Casper. This is protection against malicious 
network packets that we parse and not against local users trying to gain root
access through ping's set-uid bit - this is handled by dropping privileges very
early in ping.

Submitted by:	Mikhail <mp@lenta.ru>
2014-02-04 21:43:53 +00:00

1843 lines
47 KiB
C
Raw Blame History

/*
* 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.
* 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.
*/
#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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/capability.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>
#ifdef HAVE_LIBCAPSICUM
#include <libcapsicum.h>
#include <libcapsicum_dns.h>
#include <libcapsicum_service.h>
#endif
#ifdef IPSEC
#include <netipsec/ipsec.h>
#endif /*IPSEC*/
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <math.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.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_usec;
};
/* various options */
int options;
#define F_FLOOD 0x0001
#define F_INTERVAL 0x0002
#define F_NUMERIC 0x0004
#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
/*
* 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)
int mx_dup_ck = MAX_DUP_CHK;
char rcvd_tbl[MAX_DUP_CHK / 8];
struct sockaddr_in whereto; /* who to ping */
int datalen = DEFDATALEN;
int maxpayload;
int ssend; /* send socket file descriptor */
int srecv; /* receive socket file descriptor */
u_char outpackhdr[IP_MAXPACKET], *outpack;
char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */
char BSPACE = '\b'; /* characters written for flood */
char DOT = '.';
char *hostname;
char *shostname;
int ident; /* process id to identify our packets */
int uid; /* cached uid for micro-optimization */
u_char icmp_type = ICMP_ECHO;
u_char icmp_type_rsp = ICMP_ECHOREPLY;
int phdr_len = 0;
int send_len;
/* counters */
long nmissedmax; /* max value of ntransmitted - nreceived - 1 */
long npackets; /* max packets to transmit */
long nreceived; /* # of packets we got back */
long nrepeats; /* number of duplicates */
long ntransmitted; /* sequence # for outbound packets = #sent */
long snpackets; /* max packets to transmit in one sweep */
long snreceived; /* # of packets we got back in this sweep */
long sntransmitted; /* # of packets we sent in this sweep */
int sweepmax; /* max value of payload in sweep */
int sweepmin = 0; /* start value of payload in sweep */
int sweepincr = 1; /* payload increment in sweep */
int interval = 1000; /* interval between packets, ms */
int waittime = MAXWAIT; /* timeout for each packet */
long nrcvtimeout = 0; /* # of packets we got back after waittime */
/* timing */
int timing; /* flag to do timing */
double tmin = 999999999.0; /* minimum round trip time */
double tmax = 0.0; /* maximum round trip time */
double tsum = 0.0; /* sum of all times, for doing average */
double tsumsq = 0.0; /* sum of all times squared, for std. dev. */
volatile sig_atomic_t finish_up; /* nonzero if we've been told to finish up */
volatile sig_atomic_t siginfo_p;
#ifdef HAVE_LIBCAPSICUM
static cap_channel_t *capdns;
#endif
static void fill(char *, char *);
static u_short in_cksum(u_short *, int);
#ifdef HAVE_LIBCAPSICUM
static cap_channel_t *capdns_setup(void);
#endif
static void check_status(void);
static void finish(void) __dead2;
static void pinger(void);
static char *pr_addr(struct in_addr);
static char *pr_ntime(n_time);
static void pr_icmph(struct icmp *);
static void pr_iph(struct ip *);
static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *);
static void pr_retip(struct ip *);
static void status(int);
static void stopit(int);
static void tvsub(struct timeval *, const struct timeval *);
static void usage(void) __dead2;
int
main(int argc, char *const *argv)
{
struct sockaddr_in from, sock_in;
struct in_addr ifaddr;
struct timeval last, intvl;
struct iovec iov;
struct ip *ip;
struct msghdr msg;
struct sigaction si_sa;
size_t sz;
u_char *datap, packet[IP_MAXPACKET] __aligned(4);
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, ultmp;
int almost_done, ch, df, hold, i, icmp_len, mib[4], preload;
int ssend_errno, srecv_errno, tos, ttl;
char ctrl[CMSG_SPACE(sizeof(struct timeval))];
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;
bool cansandbox;
/*
* 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();
alarmtimeout = df = preload = tos = 0;
outpack = outpackhdr + sizeof(struct ip);
while ((ch = getopt(argc, argv,
"Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
"P:"
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
)) != -1)
{
switch(ch) {
case 'A':
options |= F_MISSED;
break;
case 'a':
options |= F_AUDIBLE;
break;
case 'c':
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp)
errx(EX_USAGE,
"invalid count of packets to transmit: `%s'",
optarg);
npackets = ultmp;
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;
setbuf(stdout, (char *)NULL);
break;
case 'G': /* Maximum packet size for ping sweep */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg)
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
if (uid != 0 && ultmp > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %lu > %u",
ultmp, DEFDATALEN);
}
options |= F_SWEEP;
sweepmax = ultmp;
break;
case 'g': /* Minimum packet size for ping sweep */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg)
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
if (uid != 0 && ultmp > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %lu > %u",
ultmp, DEFDATALEN);
}
options |= F_SWEEP;
sweepmin = ultmp;
break;
case 'h': /* Packet size increment for ping sweep */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp < 1)
errx(EX_USAGE, "invalid increment size: `%s'",
optarg);
if (uid != 0 && ultmp > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %lu > %u",
ultmp, DEFDATALEN);
}
options |= F_SWEEP;
sweepincr = ultmp;
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':
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > INT_MAX)
errx(EX_USAGE,
"invalid preload value: `%s'", optarg);
if (uid) {
errno = EPERM;
err(EX_NOPERM, "-l flag");
}
preload = ultmp;
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 */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > MAXTTL)
errx(EX_USAGE, "invalid TTL: `%s'", optarg);
ttl = ultmp;
options |= F_TTL;
break;
case 'n':
options |= F_NUMERIC;
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 */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg)
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
if (uid != 0 && ultmp > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %lu > %u",
ultmp, DEFDATALEN);
}
datalen = ultmp;
break;
case 'T': /* multicast TTL */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > MAXTTL)
errx(EX_USAGE, "invalid multicast TTL: `%s'",
optarg);
mttl = ultmp;
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);
alarm((int)alarmtimeout);
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;
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > MAXTOS)
errx(EX_USAGE, "invalid TOS: `%s'", optarg);
tos = ultmp;
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);
}
#ifdef HAVE_LIBCAPSICUM
capdns = capdns_setup();
#endif
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 {
#ifdef HAVE_LIBCAPSICUM
if (capdns != NULL)
hp = cap_gethostbyname2(capdns, source,
AF_INET);
else
#endif
hp = gethostbyname2(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 {
#ifdef HAVE_LIBCAPSICUM
if (capdns != NULL)
hp = cap_gethostbyname2(capdns, target, AF_INET);
else
#endif
hp = gethostbyname2(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;
}
#ifdef HAVE_LIBCAPSICUM
/* From now on we will use only reverse DNS lookups. */
if (capdns != NULL) {
const char *types[1];
types[0] = "ADDR";
if (cap_dns_type_limit(capdns, types, 1) < 0)
err(1, "unable to limit access to system.dns service");
}
#endif
if (ssend < 0) {
errno = ssend_errno;
err(EX_OSERR, "ssend socket");
}
if (srecv < 0) {
errno = srecv_errno;
err(EX_OSERR, "srecv socket");
}
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))
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));
#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) {
ip = (struct ip*)outpackhdr;
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 = 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;
}
if (options & F_NUMERIC)
cansandbox = true;
#ifdef HAVE_LIBCAPSICUM
else if (capdns != NULL)
cansandbox = true;
#endif
else
cansandbox = false;
/*
* 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.
*/
if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
err(1, "cap_enter");
if (cap_sandboxed())
fprintf(stderr, "capability mode sandbox enabled\n");
cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
if (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
err(1, "cap_rights_limit srecv");
cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT);
if (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
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;
if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0)
err(EX_OSERR, "setsockopt SO_TIMESTAMP");
}
#endif
if (sweepmax) {
if (sweepmin >= sweepmax)
errx(EX_USAGE, "Maximum packet size must be greater than the minimum packet size");
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 (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
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 (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
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 = stopit;
if (sigaction(SIGINT, &si_sa, 0) == -1) {
err(EX_OSERR, "sigaction SIGINT");
}
si_sa.sa_handler = status;
if (sigaction(SIGINFO, &si_sa, 0) == -1) {
err(EX_OSERR, "sigaction");
}
if (alarmtimeout > 0) {
si_sa.sa_handler = stopit;
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;
#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)gettimeofday(&last, NULL);
if (options & F_FLOOD) {
intvl.tv_sec = 0;
intvl.tv_usec = 10000;
} else {
intvl.tv_sec = interval / 1000;
intvl.tv_usec = interval % 1000 * 1000;
}
almost_done = 0;
while (!finish_up) {
struct timeval now, timeout;
fd_set rfds;
int cc, n;
check_status();
if ((unsigned)srecv >= FD_SETSIZE)
errx(EX_OSERR, "descriptor too large");
FD_ZERO(&rfds);
FD_SET(srecv, &rfds);
(void)gettimeofday(&now, NULL);
timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
while (timeout.tv_usec < 0) {
timeout.tv_usec += 1000000;
timeout.tv_sec--;
}
while (timeout.tv_usec >= 1000000) {
timeout.tv_usec -= 1000000;
timeout.tv_sec++;
}
if (timeout.tv_sec < 0)
timerclear(&timeout);
n = select(srecv + 1, &rfds, NULL, NULL, &timeout);
if (n < 0)
continue; /* Must be EINTR. */
if (n == 1) {
struct timeval *tv = NULL;
#ifdef SO_TIMESTAMP
struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl;
msg.msg_controllen = sizeof(ctrl);
#endif
msg.msg_namelen = sizeof(from);
if ((cc = recvmsg(srecv, &msg, 0)) < 0) {
if (errno == EINTR)
continue;
warn("recvmsg");
continue;
}
#ifdef SO_TIMESTAMP
if (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)gettimeofday(&now, NULL);
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) {
for (i = 0; i < sweepincr ; ++i)
*datap++ = i;
datalen += sweepincr;
if (datalen > sweepmax)
break;
send_len = icmp_len + datalen;
sntransmitted = 0;
}
if (!npackets || ntransmitted < npackets)
pinger();
else {
if (almost_done)
break;
almost_done = 1;
intvl.tv_usec = 0;
if (nreceived) {
intvl.tv_sec = 2 * tmax / 1000;
if (!intvl.tv_sec)
intvl.tv_sec = 1;
} else {
intvl.tv_sec = waittime / 1000;
intvl.tv_usec = waittime % 1000 * 1000;
}
}
(void)gettimeofday(&last, NULL);
if (ntransmitted - nreceived - 1 > nmissedmax) {
nmissedmax = ntransmitted - nreceived - 1;
if (options & F_MISSED)
(void)write(STDOUT_FILENO, &BBELL, 1);
}
}
}
finish();
/* NOTREACHED */
exit(0); /* Make the compiler happy */
}
/*
* stopit --
* Set the global bit that causes the main loop to quit.
* Do NOT call finish() from here, since finish() does far too much
* to be called from a signal handler.
*/
void
stopit(int sig __unused)
{
/*
* When doing reverse DNS lookups, the finish_up flag might not
* be noticed for a while. Just exit if we get a second SIGINT.
*/
if (!(options & F_NUMERIC) && finish_up)
_exit(nreceived ? 0 : 2);
finish_up = 1;
}
/*
* 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 "timeval" struct in
* host byte-order, to compute the round-trip time.
*/
static void
pinger(void)
{
struct timeval now;
struct tv32 tv32;
struct ip *ip;
struct icmp *icp;
int cc, i;
u_char *packet;
packet = outpack;
icp = (struct icmp *)outpack;
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)gettimeofday(&now, NULL);
tv32.tv32_sec = htonl(now.tv_sec);
tv32.tv32_usec = htonl(now.tv_usec);
if (options & F_TIME)
icp->icmp_otime = htonl((now.tv_sec % (24*60*60))
* 1000 + now.tv_usec / 1000);
if (timing)
bcopy((void *)&tv32,
(void *)&outpack[ICMP_MINLEN + phdr_len],
sizeof(tv32));
}
cc = ICMP_MINLEN + phdr_len + datalen;
/* compute ICMP checksum here */
icp->icmp_cksum = in_cksum((u_short *)icp, cc);
if (options & F_HDRINCL) {
cc += sizeof(struct ip);
ip = (struct ip *)outpackhdr;
ip->ip_len = cc;
ip->ip_sum = in_cksum((u_short *)outpackhdr, cc);
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_FLOOD)
(void)write(STDOUT_FILENO, &DOT, 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, int cc, struct sockaddr_in *from, struct timeval *tv)
{
struct in_addr ina;
u_char *cp, *dp;
struct icmp *icp;
struct ip *ip;
const void *tp;
double triptime;
int dupflag, hlen, i, j, recv_len, seq;
static int old_rrlen;
static char old_rr[MAX_IPOPTLEN];
/* Check the IP header */
ip = (struct ip *)buf;
hlen = ip->ip_hl << 2;
recv_len = cc;
if (cc < hlen + ICMP_MINLEN) {
if (options & F_VERBOSE)
warn("packet too short (%d bytes) from %s", cc,
inet_ntoa(from->sin_addr));
return;
}
/* Now the ICMP part */
cc -= hlen;
icp = (struct icmp *)(buf + hlen);
if (icp->icmp_type == icmp_type_rsp) {
if (icp->icmp_id != ident)
return; /* 'Twas not our ECHO */
++nreceived;
triptime = 0.0;
if (timing) {
struct timeval tv1;
struct tv32 tv32;
#ifndef icmp_data
tp = &icp->icmp_ip;
#else
tp = icp->icmp_data;
#endif
tp = (const char *)tp + phdr_len;
if (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_usec = ntohl(tv32.tv32_usec);
tvsub(tv, &tv1);
triptime = ((double)tv->tv_sec) * 1000.0 +
((double)tv->tv_usec) / 1000.0;
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_FLOOD)
(void)write(STDOUT_FILENO, &BSPACE, 1);
else {
(void)printf("%d bytes from %s: icmp_seq=%u", cc,
inet_ntoa(*(struct in_addr *)&from->sin_addr.s_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",
pr_addr(*(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*)&icp->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*)&icp->icmp_data[0];
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.
*/
#ifndef icmp_data
struct ip *oip = &icp->icmp_ip;
#else
struct ip *oip = (struct ip *)icp->icmp_data;
#endif
struct icmp *oicmp = (struct icmp *)(oip + 1);
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("%d bytes from %s: ", cc,
pr_addr(from->sin_addr));
pr_icmph(icp);
} 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)\n");
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_FLOOD)) {
(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_FLOOD)) {
(void)putchar('\n');
(void)fflush(stdout);
}
}
/*
* in_cksum --
* Checksum routine for Internet Protocol family headers (C Version)
*/
u_short
in_cksum(u_short *addr, int len)
{
int nleft, sum;
u_short *w;
union {
u_short us;
u_char uc[2];
} last;
u_short answer;
nleft = len;
sum = 0;
w = addr;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum), we add
* sequential 16 bit words to it, and at the end, fold back all the
* carry bits from the top 16 bits into the lower 16 bits.
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if (nleft == 1) {
last.uc[0] = *(u_char *)w;
last.uc[1] = 0;
sum += last.us;
}
/* add back carry outs from top 16 bits to low 16 bits */
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return(answer);
}
/*
* tvsub --
* Subtract 2 timeval structs: out = out - in. Out is assumed to
* be >= in.
*/
static void
tvsub(struct timeval *out, const struct timeval *in)
{
if ((out->tv_usec -= in->tv_usec) < 0) {
--out->tv_sec;
out->tv_usec += 1000000;
}
out->tv_sec -= in->tv_sec;
}
/*
* status --
* Print out statistics when SIGINFO is received.
*/
static void
status(int sig __unused)
{
siginfo_p = 1;
}
static void
check_status(void)
{
if (siginfo_p) {
siginfo_p = 0;
(void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)",
nreceived, ntransmitted,
ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0);
if (nreceived && timing)
(void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max",
tmin, tsum / (nreceived + nrepeats), tmax);
(void)fprintf(stderr, "\n");
}
}
/*
* finish --
* Print out statistics, and give up.
*/
static void
finish(void)
{
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGALRM, SIG_IGN);
(void)putchar('\n');
(void)fflush(stdout);
(void)printf("--- %s ping statistics ---\n", hostname);
(void)printf("%ld packets transmitted, ", ntransmitted);
(void)printf("%ld packets received, ", nreceived);
if (nrepeats)
(void)printf("+%ld duplicates, ", nrepeats);
if (ntransmitted) {
if (nreceived > ntransmitted)
(void)printf("-- somebody's printing up packets!");
else
(void)printf("%.1f%% packet loss",
((ntransmitted - nreceived) * 100.0) /
ntransmitted);
}
if (nrcvtimeout)
(void)printf(", %ld packets out of wait time", nrcvtimeout);
(void)putchar('\n');
if (nreceived && timing) {
double n = nreceived + nrepeats;
double avg = tsum / n;
double vari = tsumsq / n - avg * avg;
(void)printf(
"round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n",
tmin, avg, tmax, sqrt(vari));
}
if (nreceived)
exit(0);
else
exit(2);
}
#ifdef notdef
static char *ttab[] = {
"Echo Reply", /* ip + seq + udata */
"Dest Unreachable", /* net, host, proto, port, frag, sr + IP */
"Source Quench", /* IP */
"Redirect", /* redirect type, gateway, + IP */
"Echo",
"Time Exceeded", /* transit, frag reassem + IP */
"Parameter Problem", /* pointer + IP */
"Timestamp", /* id + seq + three timestamps */
"Timestamp Reply", /* " */
"Info Request", /* id + sq */
"Info Reply" /* " */
};
#endif
/*
* pr_icmph --
* Print a descriptive string about an ICMP header.
*/
static void
pr_icmph(struct icmp *icp)
{
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 */
#ifndef icmp_data
pr_retip(&icp->icmp_ip);
#else
pr_retip((struct ip *)icp->icmp_data);
#endif
break;
case ICMP_SOURCEQUENCH:
(void)printf("Source Quench\n");
#ifndef icmp_data
pr_retip(&icp->icmp_ip);
#else
pr_retip((struct ip *)icp->icmp_data);
#endif
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));
#ifndef icmp_data
pr_retip(&icp->icmp_ip);
#else
pr_retip((struct ip *)icp->icmp_data);
#endif
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;
}
#ifndef icmp_data
pr_retip(&icp->icmp_ip);
#else
pr_retip((struct ip *)icp->icmp_data);
#endif
break;
case ICMP_PARAMPROB:
(void)printf("Parameter problem: pointer = 0x%02x\n",
icp->icmp_hun.ih_pptr);
#ifndef icmp_data
pr_retip(&icp->icmp_ip);
#else
pr_retip((struct ip *)icp->icmp_data);
#endif
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)
{
u_char *cp;
int hlen;
hlen = ip->ip_hl << 2;
cp = (u_char *)ip + 20; /* point to options */
(void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\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(" %1lx %04lx",
(u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
(u_long) ntohl(ip->ip_off) & 0x1fff);
(void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
ntohs(ip->ip_sum));
(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr));
/* dump any option bytes */
while (hlen-- > 20) {
(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_NUMERIC)
return inet_ntoa(ina);
#ifdef HAVE_LIBCAPSICUM
if (capdns != NULL)
hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET);
else
#endif
hp = gethostbyaddr((char *)&ina, 4, AF_INET);
if (hp == NULL)
return inet_ntoa(ina);
(void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
inet_ntoa(ina));
return(buf);
}
/*
* pr_retip --
* Dump some info on a returned (via ICMP) IP packet.
*/
static void
pr_retip(struct ip *ip)
{
u_char *cp;
int hlen;
pr_iph(ip);
hlen = ip->ip_hl << 2;
cp = (u_char *)ip + hlen;
if (ip->ip_p == 6)
(void)printf("TCP: from port %u, to port %u (decimal)\n",
(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
else if (ip->ip_p == 17)
(void)printf("UDP: from port %u, to port %u (decimal)\n",
(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
}
static char *
pr_ntime(n_time timestamp)
{
static char buf[10];
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");
}
}
#ifdef HAVE_LIBCAPSICUM
static cap_channel_t *
capdns_setup(void)
{
cap_channel_t *capcas, *capdnsloc;
const char *types[2];
int families[1];
capcas = cap_init();
if (capcas == NULL) {
warn("unable to contact casperd");
return (NULL);
}
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");
types[0] = "NAME";
types[1] = "ADDR";
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");
return (capdnsloc);
}
#endif /* HAVE_LIBCAPSICUM */
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
#define SECOPT " [-P policy]"
#else
#define SECOPT ""
#endif
static void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
" [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
" " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
" [-W waittime] [-z tos] host",
" ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
" [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
" [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
" [-z tos] mcast-group");
exit(EX_USAGE);
}
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