/* * 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 #ifndef __APPLE__ __FBSDID("$FreeBSD: /repoman/r/ncvs/src/sbin/ping/ping.c,v 1.105 2004/08/14 17:46:10 stefanf Exp $"); #endif /* * 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 /* NB: we rely on this for */ #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include #endif /*IPSEC*/ #include #include #include #include #include #include #include #include #include #include #include #define INADDR_LEN ((int)sizeof(in_addr_t)) #define TIMEVAL_LEN ((int)sizeof(struct timeval)) #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 10 /* max seconds 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)) /* 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 /* * 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 s; /* 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 */ int interval = 1000; /* interval between packets, ms */ /* 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; static void fill(char *, char *); static u_short in_cksum(u_short *, int); 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 *, struct timeval *); static void usage(void) __dead2; int main(argc, argv) 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]; 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, sockerrno, 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 /* * Do the stuff that we need root priv's for *first*, and * then drop our setuid bit. Save error reporting for * after arg parsing. */ s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); sockerrno = errno; setuid(getuid()); uid = getuid(); alarmtimeout = df = preload = tos = 0; outpack = outpackhdr + sizeof(struct ip); while ((ch = getopt(argc, argv, "Aac:DdfI:i:Ll:M:m:nop:QqRrS:s:T:t:vz:" #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 '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); #ifndef __APPLE__ if (uid != 0 && ultmp > DEFDATALEN) { errno = EPERM; err(EX_NOPERM, "packet size too large: %lu > %u", ultmp, DEFDATALEN); } #endif 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 '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); } 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 = 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(s, (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 = 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; } 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; if (s < 0) { errno = sockerrno; err(EX_OSERR, "socket"); } hold = 1; if (options & F_SO_DEBUG) (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold, sizeof(hold)); if (options & F_SO_DONTROUTE) (void)setsockopt(s, 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(s, 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(s, 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(s, 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; } /* 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(s, 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(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) { err(EX_OSERR, "setsockopt IP_TTL"); } } if (options & F_NOLOOP) { if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) { err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP"); } } if (options & F_MTTL) { if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, sizeof(mttl)) < 0) { err(EX_OSERR, "setsockopt IP_MULTICAST_TTL"); } } if (options & F_MIF) { if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr, sizeof(ifaddr)) < 0) { err(EX_OSERR, "setsockopt IP_MULTICAST_IF"); } } #ifdef SO_TIMESTAMP { int on = 1; if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0) err(EX_OSERR, "setsockopt SO_TIMESTAMP"); } #endif /* * 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(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold, sizeof(hold)); if (uid == 0) (void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold, sizeof(hold)); if (to->sin_family == AF_INET) { (void)printf("PING %s (%s)", hostname, inet_ntoa(to->sin_addr)); if (source) (void)printf(" from %s", shostname); (void)printf(": %d data bytes\n", datalen); } 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)s >= FD_SETSIZE) errx(EX_OSERR, "descriptor too large"); FD_ZERO(&rfds); FD_SET(s, &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) timeout.tv_sec = timeout.tv_usec = 0; n = select(s + 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(s, &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 (!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 = MAXWAIT; } (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(sig) 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 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); if (options & F_TIME) icp->icmp_otime = htonl((now.tv_sec % (24*60*60)) * 1000 + now.tv_usec / 1000); if (timing) bcopy((void *)&now, (void *)&outpack[ICMP_MINLEN + phdr_len], sizeof(struct timeval)); } 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 = sendto(s, (char *)packet, cc, 0, (struct sockaddr *)&whereto, sizeof(whereto)); 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++; 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(buf, cc, from, tv) 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; #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(&tv1, tp, sizeof(tv1)); 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_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(addr, len) 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(out, in) struct timeval *out, *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(sig) int sig __unused; { siginfo_p = 1; } static void check_status() { if (siginfo_p) { siginfo_p = 0; (void)fprintf(stderr, "\r%ld/%ld packets received (%.0f%%)", 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)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("%d%% packet loss", (int)(((ntransmitted - nreceived) * 100) / ntransmitted)); } (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(icp) 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(ip) 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(ina) struct in_addr ina; { struct hostent *hp; static char buf[16 + 3 + MAXHOSTNAMELEN]; if ((options & F_NUMERIC) || !(hp = gethostbyaddr((char *)&ina, 4, AF_INET))) return inet_ntoa(ina); else (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(ip) 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(bp, patp) char *bp, *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"); } } #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC) #define SECOPT " [-P policy]" #else #define SECOPT "" #endif static void usage() { (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n", "usage: ping [-AaDdfnoQqRrv] [-c count] [-i wait] [-l preload] [-M mask | time]", " [-m ttl]" SECOPT " [-p pattern] [-S src_addr] [-s packetsize]", " [-t timeout] [-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] [-z tos] mcast-group"); exit(EX_USAGE); }