/* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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 !defined(lint) && defined(DOSCCS) static char copyright[] = "@(#) Copyright (c) 1989, 1993\n\ The Regents of the University of California. All rights reserved.\n"; static char sccsid[] = "@(#)ping.c 8.1.2 (2.11BSD) 1996/1/18"; #endif /* not lint */ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DEFDATALEN (64 - 8) /* default data length */ #define MAXIPLEN 60 #define MAXICMPLEN 76 #define MAXPACKET (4096 - 60 - 8) /* max packet size */ #define MAXWAIT 10 /* max seconds to wait for response */ #define NROUTES 9 /* number of record route slots */ #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 0x001 #define F_INTERVAL 0x002 #define F_NUMERIC 0x004 #define F_PINGFILLED 0x008 #define F_QUIET 0x010 #define F_RROUTE 0x020 #define F_SO_DEBUG 0x040 #define F_SO_DONTROUTE 0x080 #define F_VERBOSE 0x100 /* * 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 512 * to 8192 for complete accuracy... */ #define MAX_DUP_CHK (8 * 512) int mx_dup_ck = MAX_DUP_CHK; char rcvd_tbl[MAX_DUP_CHK / 8]; struct sockaddr whereto; /* who to ping */ int datalen = DEFDATALEN; int s; /* socket file descriptor */ u_char outpack[MAXPACKET]; char BSPACE = '\b'; /* characters written for flood */ char DOT = '.'; char *hostname; int ident; /* process id to identify our packets */ /* counters */ 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 = 1; /* interval between packets */ /* 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 */ char *pr_addr(); void catcher(), finish(); main(argc, argv) int argc; char **argv; { extern int errno, optind; extern char *optarg; struct timeval timeout; struct hostent *hp; struct sockaddr_in *to; struct protoent *proto; register int i; int ch, fdmask, hold, packlen, preload; u_char *datap, *packet; char *target, hnamebuf[MAXHOSTNAMELEN], *malloc(); #ifdef IP_OPTIONS char rspace[3 + 4 * NROUTES + 1]; /* record route space */ #endif preload = 0; datap = &outpack[8 + sizeof(struct timeval)]; while ((ch = getopt(argc, argv, "Rc:dfh:i:l:np:qrs:v")) != EOF) switch(ch) { case 'c': npackets = atoi(optarg); if (npackets <= 0) { (void)fprintf(stderr, "ping: bad number of packets to transmit.\n"); exit(1); } break; case 'd': options |= F_SO_DEBUG; break; case 'f': if (getuid()) { (void)fprintf(stderr, "ping: %s\n", strerror(EPERM)); exit(1); } options |= F_FLOOD; setbuf(stdout, (char *)NULL); break; case 'i': /* wait between sending packets */ interval = atoi(optarg); if (interval <= 0) { (void)fprintf(stderr, "ping: bad timing interval.\n"); exit(1); } options |= F_INTERVAL; break; case 'l': preload = atoi(optarg); if (preload < 0) { (void)fprintf(stderr, "ping: bad preload value.\n"); exit(1); } break; case 'n': options |= F_NUMERIC; break; case 'p': /* fill buffer with user pattern */ options |= F_PINGFILLED; fill((char *)datap, optarg); break; case 'q': options |= F_QUIET; break; case 'R': options |= F_RROUTE; break; case 'r': options |= F_SO_DONTROUTE; break; case 's': /* size of packet to send */ datalen = atoi(optarg); if (datalen > MAXPACKET) { (void)fprintf(stderr, "ping: packet size too large.\n"); exit(1); } if (datalen <= 0) { (void)fprintf(stderr, "ping: illegal packet size.\n"); exit(1); } break; case 'v': options |= F_VERBOSE; break; default: usage(); } argc -= optind; argv += optind; if (argc != 1) usage(); target = *argv; bzero((char *)&whereto, sizeof(struct sockaddr)); to = (struct sockaddr_in *)&whereto; to->sin_family = AF_INET; to->sin_addr.s_addr = inet_addr(target); if (to->sin_addr.s_addr != -1L) hostname = target; else { hp = gethostbyname(target); if (!hp) { (void)fprintf(stderr, "ping: unknown host %s\n", target); exit(1); } to->sin_family = hp->h_addrtype; bcopy(hp->h_addr, (caddr_t)&to->sin_addr, hp->h_length); (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); hostname = hnamebuf; } if (options & F_FLOOD && options & F_INTERVAL) { (void)fprintf(stderr, "ping: -f and -i incompatible options.\n"); exit(1); } if (datalen >= sizeof(struct timeval)) /* can we time transfer */ timing = 1; packlen = datalen + MAXIPLEN + MAXICMPLEN; if (!(packet = (u_char *)malloc((u_int)packlen))) { (void)fprintf(stderr, "ping: out of memory.\n"); exit(1); } if (!(options & F_PINGFILLED)) for (i = 8; i < datalen; ++i) *datap++ = i; ident = getpid() & 0xFFFF; if (!(proto = getprotobyname("icmp"))) { (void)fprintf(stderr, "ping: unknown protocol icmp.\n"); exit(1); } if ((s = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) { perror("ping: socket"); exit(1); } 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)); /* record route option */ if (options & F_RROUTE) { #ifdef IP_OPTIONS rspace[IPOPT_OPTVAL] = IPOPT_RR; rspace[IPOPT_OLEN] = sizeof(rspace)-1; rspace[IPOPT_OFFSET] = IPOPT_MINOFF; if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace, sizeof(rspace)) < 0) { perror("ping: record route"); exit(1); } #else (void)fprintf(stderr, "ping: record route not available in this implementation.\n"); exit(1); #endif /* IP_OPTIONS */ } /* * 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. */ hold = 48 * 1024; (void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold, sizeof(hold)); if (to->sin_family == AF_INET) (void)printf("PING %s (%s): %d data bytes\n", hostname, inet_ntoa(*(struct in_addr *)&to->sin_addr.s_addr), datalen); else (void)printf("PING %s: %d data bytes\n", hostname, datalen); (void)signal(SIGINT, finish); (void)signal(SIGALRM, catcher); while (preload--) /* fire off them quickies */ pinger(); if ((options & F_FLOOD) == 0) catcher(); /* start things going */ for (;;) { struct sockaddr_in from; register int cc; int fromlen; if (options & F_FLOOD) { pinger(); timeout.tv_sec = 0; timeout.tv_usec = 10000; fdmask = 1 << s; if (select(s + 1, (fd_set *)&fdmask, (fd_set *)NULL, (fd_set *)NULL, &timeout) < 1) continue; } fromlen = sizeof(from); if ((cc = recvfrom(s, (char *)packet, packlen, 0, (struct sockaddr *)&from, &fromlen)) < 0) { if (errno == EINTR) continue; perror("ping: recvfrom"); continue; } pr_pack((char *)packet, cc, &from); if (npackets && nreceived >= npackets) break; } finish(); /* NOTREACHED */ } /* * catcher -- * This routine causes another PING to be transmitted, and then * schedules another SIGALRM for 1 second from now. * * bug -- * Our sense of time will slowly skew (i.e., packets will not be * launched exactly at 1-second intervals). This does not affect the * quality of the delay and loss statistics. */ void catcher() { int waittime; pinger(); (void)signal(SIGALRM, catcher); if (!npackets || ntransmitted < npackets) alarm((u_int)interval); else { if (nreceived) { waittime = 2 * tmax / 1000; if (!waittime) waittime = 1; } else waittime = MAXWAIT; (void)signal(SIGALRM, finish); (void)alarm((u_int)waittime); } } /* * 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 8 bytes * of the data portion are used to hold a UNIX "timeval" struct in VAX * byte-order, to compute the round-trip time. */ pinger() { register struct icmp *icp; register int cc; int i; icp = (struct icmp *)outpack; icp->icmp_type = ICMP_ECHO; icp->icmp_code = 0; icp->icmp_cksum = 0; icp->icmp_seq = ntransmitted++; icp->icmp_id = ident; /* ID */ CLR(icp->icmp_seq % mx_dup_ck); if (timing) (void)gettimeofday((struct timeval *)&outpack[8], (struct timezone *)NULL); cc = datalen + 8; /* skips ICMP portion */ /* compute ICMP checksum here */ icp->icmp_cksum = in_cksum((u_short *)icp, cc); i = sendto(s, (char *)outpack, cc, 0, &whereto, sizeof(struct sockaddr)); if (i < 0 || i != cc) { if (i < 0) perror("ping: sendto"); (void)printf("ping: wrote %s %d chars, ret=%d\n", hostname, cc, i); } if (!(options & F_QUIET) && options & F_FLOOD) (void)write(fileno(stdout), &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!). */ pr_pack(buf, cc, from) char *buf; int cc; struct sockaddr_in *from; { register struct icmp *icp; register u_long l; register int i, j; register u_char *cp,*dp; static int old_rrlen; static char old_rr[MAX_IPOPTLEN]; struct ip *ip; struct timeval tv, *tp; double triptime; int hlen, dupflag; (void)gettimeofday(&tv, (struct timezone *)NULL); /* Check the IP header */ ip = (struct ip *)buf; hlen = ip->ip_hl << 2; if (cc < hlen + ICMP_MINLEN) { if (options & F_VERBOSE) (void)fprintf(stderr, "ping: packet too short (%d bytes) from %s\n", cc, inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr)); return; } /* Now the ICMP part */ cc -= hlen; icp = (struct icmp *)(buf + hlen); if (icp->icmp_type == ICMP_ECHOREPLY) { if (icp->icmp_id != ident) return; /* 'Twas not our ECHO */ ++nreceived; if (timing) { #ifndef icmp_data tp = (struct timeval *)&icp->icmp_ip; #else tp = (struct timeval *)icp->icmp_data; #endif tvsub(&tv, tp); triptime = ((double)tv.tv_sec) * 1000.0 + ((double)tv.tv_usec) / 1000.0; tsum += triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) tmax = triptime; } if (TST(icp->icmp_seq % mx_dup_ck)) { ++nrepeats; --nreceived; dupflag = 1; } else { SET(icp->icmp_seq % mx_dup_ck); dupflag = 0; } if (options & F_QUIET) return; if (options & F_FLOOD) (void)write(fileno(stdout), &BSPACE, 1); else { (void)printf("%d bytes from %s: icmp_seq=%u", cc, inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr), icp->icmp_seq); (void)printf(" ttl=%d", ip->ip_ttl); if (timing) (void)printf(" time=%g ms", triptime); if (dupflag) (void)printf(" (DUP!)"); /* check the data */ cp = (u_char*)&icp->icmp_data[8]; dp = &outpack[8 + sizeof(struct timeval)]; for (i = 8; i < datalen; ++i, ++cp, ++dp) { if (*cp != *dp) { (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", i, *dp, *cp); cp = (u_char*)&icp->icmp_data[0]; for (i = 8; i < datalen; ++i, ++cp) { if ((i % 32) == 8) (void)printf("\n\t"); (void)printf("%x ", *cp); } break; } } } } else { /* We've got something other than an ECHOREPLY */ if (!(options & F_VERBOSE)) return; (void)printf("%d bytes from %s: ", cc, pr_addr(from->sin_addr.s_addr)); pr_icmph(icp); } /* 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: (void)printf("\nLSRR: "); hlen -= 2; j = *++cp; ++cp; if (j > IPOPT_MINOFF) for (;;) { l = *++cp; l = (l<<8) + *++cp; l = (l<<8) + *++cp; l = (l<<8) + *++cp; if (l == 0) (void)printf("\t0.0.0.0"); else (void)printf("\t%s", pr_addr(ntohl(l))); hlen -= 4; j -= 4; if (j <= IPOPT_MINOFF) break; (void)putchar('\n'); } break; case IPOPT_RR: j = *++cp; /* get length */ i = *++cp; /* and pointer */ hlen -= 2; if (i > j) i = j; i -= IPOPT_MINOFF; if (i <= 0) continue; if (i == old_rrlen && cp == (u_char *)buf + sizeof(struct ip) + 2 && !bcmp((char *)cp, old_rr, i) && !(options & F_FLOOD)) { (void)printf("\t(same route)"); i = ((i + 3) / 4) * 4; hlen -= i; cp += i; break; } old_rrlen = i; bcopy((char *)cp, old_rr, i); (void)printf("\nRR: "); for (;;) { l = *++cp; l = (l<<8) + *++cp; l = (l<<8) + *++cp; l = (l<<8) + *++cp; if (l == 0) (void)printf("\t0.0.0.0"); else (void)printf("\t%s", pr_addr(ntohl(l))); hlen -= 4; i -= 4; if (i <= 0) break; (void)putchar('\n'); } 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) */ in_cksum(addr, len) u_short *addr; int len; { register int nleft = len; register u_short *w = addr; u_short answer = 0; long sum = 0; /* * 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) { *(u_char *)(&answer) = *(u_char *)w ; sum += answer; } /* add back carry outs from top 16 bits to low 16 bits */ sum = (sum >> 16) + (sum & 0xffffL); /* 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. */ tvsub(out, in) register 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; } /* * finish -- * Print out statistics, and give up. */ void finish() { register int i; (void)signal(SIGINT, 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) { /* Only display average to microseconds */ i = 1000.0 * tsum / (nreceived + nrepeats); (void)printf("round-trip min/avg/max = %g/%g/%g ms\n", tmin, ((double)i) / 1000.0, tmax); } exit(0); } #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. */ 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\n"); break; case ICMP_UNREACH_SRCFAIL: (void)printf("Source Route Failed\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: 0x%08lx)\n", icp->icmp_gwaddr.s_addr); #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; #ifdef ICMP_MASKREQ case ICMP_MASKREQ: (void)printf("Address Mask Request\n"); break; #endif #ifdef ICMP_MASKREPLY case ICMP_MASKREPLY: (void)printf("Address Mask Reply\n"); break; #endif default: (void)printf("Bad ICMP type: %d\n", icp->icmp_type); } } /* * pr_iph -- * Print an IP header with options. */ pr_iph(ip) struct ip *ip; { int hlen; u_char *cp; 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 Data\n"); (void)printf(" %1x %1x %02x %04x %04x", ip->ip_v, ip->ip_hl, ip->ip_tos, ip->ip_len, ip->ip_id); (void)printf(" %1x %04x", ((ip->ip_off) & 0xe000) >> 13, (ip->ip_off) & 0x1fff); (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 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 and 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. */ char * pr_addr(l) u_long l; { struct hostent *hp; static char buf[80]; if ((options & F_NUMERIC) || !(hp = gethostbyaddr((char *)&l, 4, AF_INET))) (void)sprintf(buf, "%s", inet_ntoa(*(struct in_addr *)&l)); else (void)sprintf(buf, "%s (%s)", hp->h_name, inet_ntoa(*(struct in_addr *)&l)); return(buf); } /* * pr_retip -- * Dump some info on a returned (via ICMP) IP packet. */ pr_retip(ip) struct ip *ip; { int hlen; u_char *cp; 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))); } fill(bp, patp) char *bp, *patp; { register int ii, jj, kk; int pat[16]; char *cp; for (cp = patp; *cp; cp++) if (!isxdigit(*cp)) { (void)fprintf(stderr, "ping: patterns must be specified as hex digits.\n"); exit(1); } 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 <= MAXPACKET - (8 + sizeof(struct timeval) + 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"); } } usage() { (void)fprintf(stderr, "usage: ping [-Rdfnqrv] [-c count] [-i wait] [-l preload]\n\t[-p pattern] [-s packetsize] host\n"); exit(1); }