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freebsd-skq/sbin/ping/ping.c
oshogbo fff97aa66a We return a pointer when we are using cap_init() or cap_service_open() 
function, so check if cap_chanel_t is NULL is not enough.
Casper with a normal libc will still fail in capability mote so let's not
enter capability mode without casper support when we need to resolve DNS.

Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D12823
2017-11-12 07:18:10 +00:00

1822 lines
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/*
* 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.
*/
#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/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 <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 */
static 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)
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 char DOT = '.';
static char *hostname;
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 nreceived; /* # of packets we got back */
static long nrepeats; /* number of duplicates */
static long ntransmitted; /* sequence # for outbound packets = #sent */
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 long nrcvtimeout = 0; /* # of packets we got back after waittime */
/* timing */
static int timing; /* flag to do timing */
static double tmin = 999999999.0; /* minimum round trip time */
static double tmax = 0.0; /* maximum round trip time */
static double tsum = 0.0; /* sum of all times, for doing average */
static double tsumsq = 0.0; /* sum of all times squared, for std. dev. */
/* nonzero if we've been told to finish up */
static volatile sig_atomic_t finish_up;
static volatile sig_atomic_t siginfo_p;
static cap_channel_t *capdns;
static void fill(char *, char *);
static u_short in_cksum(u_short *, int);
static cap_channel_t *capdns_setup(void);
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();
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 = 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);
}
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 {
if (capdns != NULL)
hp = cap_gethostbyname2(capdns, source,
AF_INET);
else
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 {
if (capdns != NULL)
hp = cap_gethostbyname2(capdns, target, AF_INET);
else
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;
}
/* 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");
}
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 = 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;
}
if (options & F_NUMERIC)
cansandbox = true;
else if (capdns != NULL)
cansandbox = CASPER_SUPPORT;
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");
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 no less 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 = htons(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 ((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_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",
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*)&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)
{
struct in_addr ina;
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));
memcpy(&ina, &ip->ip_src.s_addr, sizeof ina);
(void)printf(" %s ", inet_ntoa(ina));
memcpy(&ina, &ip->ip_dst.s_addr, sizeof ina);
(void)printf(" %s ", inet_ntoa(ina));
/* 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);
if (capdns != NULL)
hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET);
else
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");
}
}
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)
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");
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);
}
#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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