| /* vi: set sw=4 ts=4: */ |
| /* |
| * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| //#define version "1.4a12" |
| |
| |
| /* |
| * traceroute host - trace the route ip packets follow going to "host". |
| * |
| * Attempt to trace the route an ip packet would follow to some |
| * internet host. We find out intermediate hops by launching probe |
| * packets with a small ttl (time to live) then listening for an |
| * icmp "time exceeded" reply from a gateway. We start our probes |
| * with a ttl of one and increase by one until we get an icmp "port |
| * unreachable" (which means we got to "host") or hit a max (which |
| * defaults to 30 hops & can be changed with the -m flag). Three |
| * probes (change with -q flag) are sent at each ttl setting and a |
| * line is printed showing the ttl, address of the gateway and |
| * round trip time of each probe. If the probe answers come from |
| * different gateways, the address of each responding system will |
| * be printed. If there is no response within a 5 sec. timeout |
| * interval (changed with the -w flag), a "*" is printed for that |
| * probe. |
| * |
| * Probe packets are UDP format. We don't want the destination |
| * host to process them so the destination port is set to an |
| * unlikely value (if some clod on the destination is using that |
| * value, it can be changed with the -p flag). |
| * |
| * A sample use might be: |
| * |
| * [yak 71]% traceroute nis.nsf.net. |
| * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet |
| * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms |
| * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms |
| * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms |
| * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms |
| * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms |
| * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms |
| * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms |
| * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms |
| * |
| * Note that lines 2 & 3 are the same. This is due to a buggy |
| * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards |
| * packets with a zero ttl. |
| * |
| * A more interesting example is: |
| * |
| * [yak 72]% traceroute allspice.lcs.mit.edu. |
| * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max |
| * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms |
| * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms |
| * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms |
| * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms |
| * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms |
| * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms |
| * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms |
| * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms |
| * 12 * * * |
| * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms |
| * 14 * * * |
| * 15 * * * |
| * 16 * * * |
| * 17 * * * |
| * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms |
| * |
| * (I start to see why I'm having so much trouble with mail to |
| * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away |
| * either don't send ICMP "time exceeded" messages or send them |
| * with a ttl too small to reach us. 14 - 17 are running the |
| * MIT C Gateway code that doesn't send "time exceeded"s. God |
| * only knows what's going on with 12. |
| * |
| * The silent gateway 12 in the above may be the result of a bug in |
| * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) |
| * sends an unreachable message using whatever ttl remains in the |
| * original datagram. Since, for gateways, the remaining ttl is |
| * zero, the icmp "time exceeded" is guaranteed to not make it back |
| * to us. The behavior of this bug is slightly more interesting |
| * when it appears on the destination system: |
| * |
| * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms |
| * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms |
| * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms |
| * 7 * * * |
| * 8 * * * |
| * 9 * * * |
| * 10 * * * |
| * 11 * * * |
| * 12 * * * |
| * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! |
| * |
| * Notice that there are 12 "gateways" (13 is the final |
| * destination) and exactly the last half of them are "missing". |
| * What's really happening is that rip (a Sun-3 running Sun OS3.5) |
| * is using the ttl from our arriving datagram as the ttl in its |
| * icmp reply. So, the reply will time out on the return path |
| * (with no notice sent to anyone since icmp's aren't sent for |
| * icmp's) until we probe with a ttl that's at least twice the path |
| * length. I.e., rip is really only 7 hops away. A reply that |
| * returns with a ttl of 1 is a clue this problem exists. |
| * Traceroute prints a "!" after the time if the ttl is <= 1. |
| * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or |
| * non-standard (HPUX) software, expect to see this problem |
| * frequently and/or take care picking the target host of your |
| * probes. |
| * |
| * Other possible annotations after the time are !H, !N, !P (got a host, |
| * network or protocol unreachable, respectively), !S or !F (source |
| * route failed or fragmentation needed -- neither of these should |
| * ever occur and the associated gateway is busted if you see one). If |
| * almost all the probes result in some kind of unreachable, traceroute |
| * will give up and exit. |
| * |
| * Notes |
| * ----- |
| * This program must be run by root or be setuid. (I suggest that |
| * you *don't* make it setuid -- casual use could result in a lot |
| * of unnecessary traffic on our poor, congested nets.) |
| * |
| * This program requires a kernel mod that does not appear in any |
| * system available from Berkeley: A raw ip socket using proto |
| * IPPROTO_RAW must interpret the data sent as an ip datagram (as |
| * opposed to data to be wrapped in a ip datagram). See the README |
| * file that came with the source to this program for a description |
| * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may |
| * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE |
| * MODIFIED TO RUN THIS PROGRAM. |
| * |
| * The udp port usage may appear bizarre (well, ok, it is bizarre). |
| * The problem is that an icmp message only contains 8 bytes of |
| * data from the original datagram. 8 bytes is the size of a udp |
| * header so, if we want to associate replies with the original |
| * datagram, the necessary information must be encoded into the |
| * udp header (the ip id could be used but there's no way to |
| * interlock with the kernel's assignment of ip id's and, anyway, |
| * it would have taken a lot more kernel hacking to allow this |
| * code to set the ip id). So, to allow two or more users to |
| * use traceroute simultaneously, we use this task's pid as the |
| * source port (the high bit is set to move the port number out |
| * of the "likely" range). To keep track of which probe is being |
| * replied to (so times and/or hop counts don't get confused by a |
| * reply that was delayed in transit), we increment the destination |
| * port number before each probe. |
| * |
| * Don't use this as a coding example. I was trying to find a |
| * routing problem and this code sort-of popped out after 48 hours |
| * without sleep. I was amazed it ever compiled, much less ran. |
| * |
| * I stole the idea for this program from Steve Deering. Since |
| * the first release, I've learned that had I attended the right |
| * IETF working group meetings, I also could have stolen it from Guy |
| * Almes or Matt Mathis. I don't know (or care) who came up with |
| * the idea first. I envy the originators' perspicacity and I'm |
| * glad they didn't keep the idea a secret. |
| * |
| * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or |
| * enhancements to the original distribution. |
| * |
| * I've hacked up a round-trip-route version of this that works by |
| * sending a loose-source-routed udp datagram through the destination |
| * back to yourself. Unfortunately, SO many gateways botch source |
| * routing, the thing is almost worthless. Maybe one day... |
| * |
| * -- Van Jacobson (van@ee.lbl.gov) |
| * Tue Dec 20 03:50:13 PST 1988 |
| */ |
| |
| #define TRACEROUTE_SO_DEBUG 0 |
| |
| /* TODO: undefs were uncommented - ??! we have config system for that! */ |
| /* probably ok to remove altogether */ |
| //#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| //#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| //#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| |
| #include "inet_common.h" |
| |
| #include <net/if.h> |
| #include <arpa/inet.h> |
| #include <netinet/in.h> |
| #include <netinet/udp.h> |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| |
| #include "busybox.h" |
| |
| |
| /* |
| * Definitions for internet protocol version 4. |
| * Per RFC 791, September 1981. |
| */ |
| #define IPVERSION 4 |
| |
| #ifndef IPPROTO_ICMP |
| /* Grrrr.... */ |
| #define IPPROTO_ICMP 1 |
| #endif |
| #ifndef IPPROTO_IP |
| #define IPPROTO_IP 0 |
| #endif |
| |
| /* |
| * Overlay for ip header used by other protocols (tcp, udp). |
| */ |
| struct ipovly { |
| unsigned char ih_x1[9]; /* (unused) */ |
| unsigned char ih_pr; /* protocol */ |
| short ih_len; /* protocol length */ |
| struct in_addr ih_src; /* source internet address */ |
| struct in_addr ih_dst; /* destination internet address */ |
| }; |
| |
| /* |
| * UDP kernel structures and variables. |
| */ |
| struct udpiphdr { |
| struct ipovly ui_i; /* overlaid ip structure */ |
| struct udphdr ui_u; /* udp header */ |
| }; |
| #define ui_next ui_i.ih_next |
| #define ui_prev ui_i.ih_prev |
| #define ui_x1 ui_i.ih_x1 |
| #define ui_pr ui_i.ih_pr |
| #define ui_len ui_i.ih_len |
| #define ui_src ui_i.ih_src |
| #define ui_dst ui_i.ih_dst |
| #define ui_sport ui_u.uh_sport |
| #define ui_dport ui_u.uh_dport |
| #define ui_ulen ui_u.uh_ulen |
| #define ui_sum ui_u.uh_sum |
| |
| |
| /* Host name and address list */ |
| struct hostinfo { |
| char *name; |
| int n; |
| u_int32_t *addrs; |
| }; |
| |
| /* Data section of the probe packet */ |
| struct outdata { |
| unsigned char seq; /* sequence number of this packet */ |
| unsigned char ttl; /* ttl packet left with */ |
| struct timeval tv ATTRIBUTE_PACKED; /* time packet left */ |
| }; |
| |
| struct IFADDRLIST { |
| u_int32_t addr; |
| char device[sizeof(struct ifreq)]; |
| }; |
| |
| |
| static const char route[] = "/proc/net/route"; |
| |
| /* last inbound (icmp) packet */ |
| static unsigned char packet[512] ATTRIBUTE_ALIGNED(32); |
| |
| static struct ip *outip; /* last output (udp) packet */ |
| static struct udphdr *outudp; /* last output (udp) packet */ |
| static struct outdata *outdata; /* last output (udp) packet */ |
| |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| static struct icmp *outicmp; /* last output (icmp) packet */ |
| #endif |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| /* Maximum number of gateways (include room for one noop) */ |
| #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t))) |
| /* loose source route gateway list (including room for final destination) */ |
| static u_int32_t gwlist[NGATEWAYS + 1]; |
| #endif |
| |
| static int s; /* receive (icmp) socket file descriptor */ |
| static int sndsock; /* send (udp/icmp) socket file descriptor */ |
| |
| static struct sockaddr_storage whereto; /* Who to try to reach */ |
| static struct sockaddr_storage wherefrom; /* Who we are */ |
| static int packlen; /* total length of packet */ |
| static int minpacket; /* min ip packet size */ |
| static int maxpacket = 32 * 1024; /* max ip packet size */ |
| static int pmtu; /* Path MTU Discovery (RFC1191) */ |
| |
| static char *hostname; |
| |
| static uint16_t ident; |
| static uint16_t port = 32768 + 666; /* start udp dest port # for probe packets */ |
| |
| static int waittime = 5; /* time to wait for response (in seconds) */ |
| static int nflag; /* print addresses numerically */ |
| static int doipcksum = 1; /* calculate ip checksums by default */ |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| static int optlen; /* length of ip options */ |
| #else |
| #define optlen 0 |
| #endif |
| |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| static int useicmp; /* use icmp echo instead of udp packets */ |
| #endif |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| static int verbose; |
| #endif |
| |
| /* |
| * Return the interface list |
| */ |
| static int |
| ifaddrlist(struct IFADDRLIST **ipaddrp) |
| { |
| int fd, nipaddr; |
| #ifdef HAVE_SOCKADDR_SA_LEN |
| int n; |
| #endif |
| struct ifreq *ifrp, *ifend, *ifnext; |
| struct sockaddr_in *addr_sin; |
| struct IFADDRLIST *al; |
| struct ifconf ifc; |
| struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; |
| struct IFADDRLIST *st_ifaddrlist; |
| |
| fd = xsocket(AF_INET, SOCK_DGRAM, 0); |
| |
| ifc.ifc_len = sizeof(ibuf); |
| ifc.ifc_buf = (caddr_t)ibuf; |
| |
| if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || |
| ifc.ifc_len < sizeof(struct ifreq)) { |
| if (errno == EINVAL) |
| bb_error_msg_and_die( |
| "SIOCGIFCONF: ifreq struct too small (%d bytes)", |
| (int)sizeof(ibuf)); |
| else |
| bb_perror_msg_and_die("SIOCGIFCONF"); |
| } |
| ifrp = ibuf; |
| ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); |
| |
| nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq)); |
| st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST)); |
| al = st_ifaddrlist; |
| nipaddr = 0; |
| |
| for (; ifrp < ifend; ifrp = ifnext) { |
| #ifdef HAVE_SOCKADDR_SA_LEN |
| n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); |
| if (n < sizeof(*ifrp)) |
| ifnext = ifrp + 1; |
| else |
| ifnext = (struct ifreq *)((char *)ifrp + n); |
| if (ifrp->ifr_addr.sa_family != AF_INET) |
| continue; |
| #else |
| ifnext = ifrp + 1; |
| #endif |
| /* |
| * Need a template to preserve address info that is |
| * used below to locate the next entry. (Otherwise, |
| * SIOCGIFFLAGS stomps over it because the requests |
| * are returned in a union.) |
| */ |
| strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); |
| if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { |
| if (errno == ENXIO) |
| continue; |
| bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s", |
| (int)sizeof(ifr.ifr_name), ifr.ifr_name); |
| } |
| |
| /* Must be up */ |
| if ((ifr.ifr_flags & IFF_UP) == 0) |
| continue; |
| |
| safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1); |
| #ifdef sun |
| /* Ignore sun virtual interfaces */ |
| if (strchr(al->device, ':') != NULL) |
| continue; |
| #endif |
| if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) |
| bb_perror_msg_and_die("SIOCGIFADDR: %s", al->device); |
| |
| addr_sin = (struct sockaddr_in *)&ifr.ifr_addr; |
| al->addr = addr_sin->sin_addr.s_addr; |
| ++al; |
| ++nipaddr; |
| } |
| if (nipaddr == 0) |
| bb_error_msg_and_die ("can't find any network interfaces"); |
| (void)close(fd); |
| |
| *ipaddrp = st_ifaddrlist; |
| return nipaddr; |
| } |
| |
| |
| static void |
| setsin(struct sockaddr_in *addr_sin, u_int32_t addr) |
| { |
| memset(addr_sin, 0, sizeof(*addr_sin)); |
| #ifdef HAVE_SOCKADDR_SA_LEN |
| addr_sin->sin_len = sizeof(*addr_sin); |
| #endif |
| addr_sin->sin_family = AF_INET; |
| addr_sin->sin_addr.s_addr = addr; |
| } |
| |
| |
| /* |
| * Return the source address for the given destination address |
| */ |
| static void |
| findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from) |
| { |
| int i, n; |
| FILE *f; |
| u_int32_t mask; |
| u_int32_t dest, tmask; |
| struct IFADDRLIST *al; |
| char buf[256], tdevice[256], device[256]; |
| |
| f = xfopen(route, "r"); |
| |
| /* Find the appropriate interface */ |
| n = 0; |
| mask = 0; |
| device[0] = '\0'; |
| while (fgets(buf, sizeof(buf), f) != NULL) { |
| ++n; |
| if (n == 1 && strncmp(buf, "Iface", 5) == 0) |
| continue; |
| if ((i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x", |
| tdevice, &dest, &tmask)) != 3) |
| bb_error_msg_and_die ("junk in buffer"); |
| if ((to->sin_addr.s_addr & tmask) == dest && |
| (tmask > mask || mask == 0)) { |
| mask = tmask; |
| strcpy(device, tdevice); |
| } |
| } |
| fclose(f); |
| |
| if (device[0] == '\0') |
| bb_error_msg_and_die ("can't find interface"); |
| |
| /* Get the interface address list */ |
| n = ifaddrlist(&al); |
| |
| /* Find our appropriate source address */ |
| for (i = n; i > 0; --i, ++al) |
| if (strcmp(device, al->device) == 0) |
| break; |
| if (i <= 0) |
| bb_error_msg_and_die("can't find interface %s", device); |
| |
| setsin(from, al->addr); |
| } |
| |
| /* |
| "Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n" |
| "\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n" |
| "\t[-w waittime] [-z pausemsecs] host [packetlen]" |
| |
| */ |
| |
| /* |
| * Subtract 2 timeval structs: out = out - in. |
| * Out is assumed to be >= in. |
| */ |
| static inline void |
| tvsub(struct timeval *out, struct timeval *in) |
| { |
| |
| if ((out->tv_usec -= in->tv_usec) < 0) { |
| --out->tv_sec; |
| out->tv_usec += 1000000; |
| } |
| out->tv_sec -= in->tv_sec; |
| } |
| |
| static int |
| wait_for_reply(int sock, struct sockaddr_in *fromp, const struct timeval *tp) |
| { |
| fd_set fds; |
| struct timeval now, tvwait; |
| struct timezone tz; |
| int cc = 0; |
| socklen_t fromlen = sizeof(*fromp); |
| |
| FD_ZERO(&fds); |
| FD_SET(sock, &fds); |
| |
| tvwait.tv_sec = tp->tv_sec + waittime; |
| tvwait.tv_usec = tp->tv_usec; |
| (void)gettimeofday(&now, &tz); |
| tvsub(&tvwait, &now); |
| |
| if (select(sock + 1, &fds, NULL, NULL, &tvwait) > 0) |
| cc = recvfrom(sock, (char *)packet, sizeof(packet), 0, |
| (struct sockaddr *)fromp, &fromlen); |
| |
| return cc; |
| } |
| |
| /* |
| * Checksum routine for Internet Protocol family headers (C Version) |
| */ |
| static uint16_t |
| in_cksum(uint16_t *addr, int len) |
| { |
| int nleft = len; |
| uint16_t *w = addr; |
| uint16_t answer; |
| int 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) |
| sum += *(unsigned char *)w; |
| |
| /* |
| * 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; |
| } |
| |
| |
| static void |
| send_probe(int seq, int ttl, struct timeval *tp) |
| { |
| int cc; |
| struct udpiphdr *ui, *oui; |
| struct ip tip; |
| |
| outip->ip_ttl = ttl; |
| outip->ip_id = htons(ident + seq); |
| |
| /* |
| * In most cases, the kernel will recalculate the ip checksum. |
| * But we must do it anyway so that the udp checksum comes out |
| * right. |
| */ |
| if (doipcksum) { |
| outip->ip_sum = |
| in_cksum((uint16_t *)outip, sizeof(*outip) + optlen); |
| if (outip->ip_sum == 0) |
| outip->ip_sum = 0xffff; |
| } |
| |
| /* Payload */ |
| outdata->seq = seq; |
| outdata->ttl = ttl; |
| memcpy(&outdata->tv, tp, sizeof(outdata->tv)); |
| |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| if (useicmp) |
| outicmp->icmp_seq = htons(seq); |
| else |
| #endif |
| outudp->dest = htons(port + seq); |
| |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| if (useicmp) { |
| /* Always calculate checksum for icmp packets */ |
| outicmp->icmp_cksum = 0; |
| outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp, |
| packlen - (sizeof(*outip) + optlen)); |
| if (outicmp->icmp_cksum == 0) |
| outicmp->icmp_cksum = 0xffff; |
| } else |
| #endif |
| if (doipcksum) { |
| /* Checksum (we must save and restore ip header) */ |
| tip = *outip; |
| ui = (struct udpiphdr *)outip; |
| oui = (struct udpiphdr *)&tip; |
| /* Easier to zero and put back things that are ok */ |
| memset((char *)ui, 0, sizeof(ui->ui_i)); |
| ui->ui_src = oui->ui_src; |
| ui->ui_dst = oui->ui_dst; |
| ui->ui_pr = oui->ui_pr; |
| ui->ui_len = outudp->len; |
| outudp->check = 0; |
| outudp->check = in_cksum((uint16_t *)ui, packlen); |
| if (outudp->check == 0) |
| outudp->check = 0xffff; |
| *outip = tip; |
| } |
| |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* XXX undocumented debugging hack */ |
| if (verbose > 1) { |
| const uint16_t *sp; |
| int nshorts, i; |
| |
| sp = (uint16_t *)outip; |
| nshorts = (u_int)packlen / sizeof(uint16_t); |
| i = 0; |
| printf("[ %d bytes", packlen); |
| while (--nshorts >= 0) { |
| if ((i++ % 8) == 0) |
| printf("\n\t"); |
| printf(" %04x", ntohs(*sp)); |
| sp++; |
| } |
| if (packlen & 1) { |
| if ((i % 8) == 0) |
| printf("\n\t"); |
| printf(" %02x", *(unsigned char *)sp); |
| } |
| printf("]\n"); |
| } |
| #endif |
| |
| #if !defined(IP_HDRINCL) && defined(IP_TTL) |
| if (setsockopt(sndsock, IPPROTO_IP, IP_TTL, |
| (char *)&ttl, sizeof(ttl)) < 0) { |
| bb_perror_msg_and_die("setsockopt ttl %d", ttl); |
| } |
| #endif |
| |
| cc = sendto(sndsock, (char *)outip, |
| packlen, 0, (struct sockaddr *)&whereto, sizeof(whereto)); |
| if (cc < 0 || cc != packlen) { |
| if (cc < 0) |
| bb_perror_msg_and_die("sendto"); |
| printf("%s: wrote %s %d chars, ret=%d\n", |
| applet_name, hostname, packlen, cc); |
| (void)fflush(stdout); |
| } |
| } |
| |
| static inline double |
| deltaT(struct timeval *t1p, struct timeval *t2p) |
| { |
| double dt; |
| |
| dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + |
| (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; |
| return dt; |
| } |
| |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* |
| * Convert an ICMP "type" field to a printable string. |
| */ |
| static inline const char * |
| pr_type(unsigned char t) |
| { |
| static const char * const ttab[] = { |
| "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", |
| "Source Quench", "Redirect", "ICMP 6", "ICMP 7", |
| "Echo", "Router Advert", "Router Solicit", "Time Exceeded", |
| "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", |
| "Info Reply", "Mask Request", "Mask Reply" |
| }; |
| |
| if (t > 18) |
| return "OUT-OF-RANGE"; |
| |
| return ttab[t]; |
| } |
| #endif |
| |
| static int |
| packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) |
| { |
| struct icmp *icp; |
| unsigned char type, code; |
| int hlen; |
| struct ip *ip; |
| |
| ip = (struct ip *) buf; |
| hlen = ip->ip_hl << 2; |
| if (cc < hlen + ICMP_MINLEN) { |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| if (verbose) |
| printf("packet too short (%d bytes) from %s\n", cc, |
| inet_ntoa(from->sin_addr)); |
| #endif |
| return 0; |
| } |
| cc -= hlen; |
| icp = (struct icmp *)(buf + hlen); |
| type = icp->icmp_type; |
| code = icp->icmp_code; |
| /* Path MTU Discovery (RFC1191) */ |
| if (code != ICMP_UNREACH_NEEDFRAG) |
| pmtu = 0; |
| else { |
| pmtu = ntohs(icp->icmp_nextmtu); |
| } |
| if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || |
| type == ICMP_UNREACH || type == ICMP_ECHOREPLY) { |
| struct ip *hip; |
| struct udphdr *up; |
| |
| hip = &icp->icmp_ip; |
| hlen = hip->ip_hl << 2; |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| if (useicmp) { |
| struct icmp *hicmp; |
| |
| /* XXX */ |
| if (type == ICMP_ECHOREPLY && |
| icp->icmp_id == htons(ident) && |
| icp->icmp_seq == htons(seq)) |
| return -2; |
| |
| hicmp = (struct icmp *)((unsigned char *)hip + hlen); |
| /* XXX 8 is a magic number */ |
| if (hlen + 8 <= cc && |
| hip->ip_p == IPPROTO_ICMP && |
| hicmp->icmp_id == htons(ident) && |
| hicmp->icmp_seq == htons(seq)) |
| return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| } else |
| #endif |
| { |
| up = (struct udphdr *)((unsigned char *)hip + hlen); |
| /* XXX 8 is a magic number */ |
| if (hlen + 12 <= cc && |
| hip->ip_p == IPPROTO_UDP && |
| up->source == htons(ident) && |
| up->dest == htons(port + seq)) |
| return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| } |
| } |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| if (verbose) { |
| int i; |
| u_int32_t *lp = (u_int32_t *)&icp->icmp_ip; |
| |
| printf("\n%d bytes from %s to " |
| "%s: icmp type %d (%s) code %d\n", |
| cc, inet_ntoa(from->sin_addr), |
| inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code); |
| for (i = 4; i < cc ; i += sizeof(*lp)) |
| printf("%2d: x%8.8x\n", i, *lp++); |
| } |
| #endif |
| return 0; |
| } |
| |
| |
| /* |
| * Construct an Internet address representation. |
| * If the nflag has been supplied, give |
| * numeric value, otherwise try for symbolic name. |
| */ |
| static inline void |
| inetname(struct sockaddr_in *from) |
| { |
| const char *n = NULL; |
| const char *ina; |
| char name[257]; |
| |
| if (!nflag && from->sin_addr.s_addr != INADDR_ANY) { |
| if (INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0) |
| n = name; |
| } |
| ina = inet_ntoa(from->sin_addr); |
| if (nflag) |
| printf(" %s", ina); |
| else |
| printf(" %s (%s)", (n ? n : ina), ina); |
| } |
| |
| static inline void |
| print(unsigned char *buf, int cc, struct sockaddr_in *from) |
| { |
| struct ip *ip; |
| int hlen; |
| |
| ip = (struct ip *) buf; |
| hlen = ip->ip_hl << 2; |
| cc -= hlen; |
| |
| inetname(from); |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| if (verbose) |
| printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); |
| #endif |
| } |
| |
| |
| static struct hostinfo * |
| gethostinfo(const char *host) |
| { |
| int n; |
| struct hostent *hp; |
| struct hostinfo *hi; |
| char **p; |
| u_int32_t addr, *ap; |
| |
| hi = xzalloc(sizeof(*hi)); |
| addr = inet_addr(host); |
| if ((int32_t)addr != -1) { |
| hi->name = xstrdup(host); |
| hi->n = 1; |
| hi->addrs = xzalloc(sizeof(hi->addrs[0])); |
| hi->addrs[0] = addr; |
| return hi; |
| } |
| |
| hp = xgethostbyname(host); |
| if (hp->h_addrtype != AF_INET || hp->h_length != 4) |
| bb_perror_msg_and_die("bad host %s", host); |
| hi->name = xstrdup(hp->h_name); |
| for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p) |
| continue; |
| hi->n = n; |
| hi->addrs = xzalloc(n * sizeof(hi->addrs[0])); |
| for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p) |
| memcpy(ap, *p, sizeof(*ap)); |
| return hi; |
| } |
| |
| static void |
| freehostinfo(struct hostinfo *hi) |
| { |
| free(hi->name); |
| hi->name = NULL; |
| free((char *)hi->addrs); |
| free((char *)hi); |
| } |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| static void |
| getaddr(u_int32_t *ap, const char *host) |
| { |
| struct hostinfo *hi; |
| |
| hi = gethostinfo(host); |
| *ap = hi->addrs[0]; |
| freehostinfo(hi); |
| } |
| #endif |
| |
| |
| int |
| traceroute_main(int argc, char *argv[]) |
| { |
| static const int on = 1; |
| |
| int code, n; |
| unsigned char *outp; |
| u_int32_t *ap; |
| struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom; |
| struct sockaddr_in *to = (struct sockaddr_in *)&whereto; |
| struct hostinfo *hi; |
| int ttl, probe, i; |
| int seq = 0; |
| int tos = 0; |
| char *tos_str = NULL; |
| char *source = NULL; |
| unsigned long op; |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| int lsrr = 0; |
| #endif |
| uint16_t off = 0; |
| struct IFADDRLIST *al; |
| char *device = NULL; |
| int max_ttl = 30; |
| char *max_ttl_str = NULL; |
| char *port_str = NULL; |
| int nprobes = 3; |
| char *nprobes_str = NULL; |
| char *waittime_str = NULL; |
| u_int pausemsecs = 0; |
| char *pausemsecs_str = NULL; |
| int first_ttl = 1; |
| char *first_ttl_str = NULL; |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| llist_t *sourse_route_list = NULL; |
| #endif |
| |
| opterr = 0; |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| opt_complementary = "x-x:g::"; |
| #else |
| opt_complementary = "x-x"; |
| #endif |
| |
| op = getopt32(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" |
| #define USAGE_OP_DONT_FRAGMNT (1<<0) /* F */ |
| #define USAGE_OP_USE_ICMP (1<<1) /* I */ |
| #define USAGE_OP_TTL_FLAG (1<<2) /* l */ |
| #define USAGE_OP_ADDR_NUM (1<<3) /* n */ |
| #define USAGE_OP_BYPASS_ROUTE (1<<4) /* r */ |
| #define USAGE_OP_DEBUG (1<<5) /* d */ |
| #define USAGE_OP_VERBOSE (1<<6) /* v */ |
| #define USAGE_OP_IP_CHKSUM (1<<7) /* x */ |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| "g:" |
| #endif |
| , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str, |
| &source, &waittime_str, &pausemsecs_str, &first_ttl_str |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| , &sourse_route_list |
| #endif |
| ); |
| |
| if (op & USAGE_OP_DONT_FRAGMNT) |
| off = IP_DF; |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| useicmp = op & USAGE_OP_USE_ICMP; |
| #endif |
| nflag = op & USAGE_OP_ADDR_NUM; |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| verbose = op & USAGE_OP_VERBOSE; |
| #endif |
| if (op & USAGE_OP_IP_CHKSUM) { |
| doipcksum = 0; |
| bb_error_msg("warning: ip checksums disabled"); |
| } |
| if (tos_str) |
| tos = xatoul_range(tos_str, 0, 255); |
| if (max_ttl_str) |
| max_ttl = xatoul_range(max_ttl_str, 1, 255); |
| if (port_str) |
| port = xatou16(port_str); |
| if (nprobes_str) |
| nprobes = xatoul_range(nprobes_str, 1, INT_MAX); |
| if (source) { |
| /* |
| * set the ip source address of the outbound |
| * probe (e.g., on a multi-homed host). |
| */ |
| if (getuid()) bb_error_msg_and_die("-s %s: permission denied", source); |
| } |
| if (waittime_str) |
| waittime = xatoul_range(waittime_str, 2, 24 * 60 * 60); |
| if (pausemsecs_str) |
| pausemsecs = xatoul_range(pausemsecs_str, 0, 60 * 60 * 1000); |
| if (first_ttl_str) |
| first_ttl = xatoul_range(first_ttl_str, 1, 255); |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| if (sourse_route_list) { |
| llist_t *l_sr; |
| |
| for(l_sr = sourse_route_list; l_sr; ) { |
| if (lsrr >= NGATEWAYS) |
| bb_error_msg_and_die("no more than %d gateways", NGATEWAYS); |
| getaddr(gwlist + lsrr, l_sr->data); |
| ++lsrr; |
| l_sr = l_sr->link; |
| free(sourse_route_list); |
| sourse_route_list = l_sr; |
| } |
| optlen = (lsrr + 1) * sizeof(gwlist[0]); |
| } |
| #endif |
| |
| if (first_ttl > max_ttl) { |
| bb_error_msg_and_die( |
| "first ttl (%d) may not be greater than max ttl (%d)", |
| first_ttl, max_ttl); |
| } |
| |
| minpacket = sizeof(*outip) + sizeof(*outdata) + optlen; |
| |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| if (useicmp) |
| minpacket += 8; /* XXX magic number */ |
| else |
| #endif |
| minpacket += sizeof(*outudp); |
| packlen = minpacket; /* minimum sized packet */ |
| |
| /* Process destination and optional packet size */ |
| switch (argc - optind) { |
| |
| case 2: |
| packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket); |
| /* Fall through */ |
| |
| case 1: |
| hostname = argv[optind]; |
| hi = gethostinfo(hostname); |
| setsin(to, hi->addrs[0]); |
| if (hi->n > 1) |
| bb_error_msg("warning: %s has multiple addresses; using %s", |
| hostname, inet_ntoa(to->sin_addr)); |
| hostname = hi->name; |
| hi->name = NULL; |
| freehostinfo(hi); |
| break; |
| |
| default: |
| bb_show_usage(); |
| } |
| |
| /* Insure the socket fds won't be 0, 1 or 2 */ |
| do n = xopen(bb_dev_null, O_RDONLY); while (n < 2); |
| if (n > 2) |
| close(n); |
| |
| s = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| |
| #if TRACEROUTE_SO_DEBUG |
| if (op & USAGE_OP_DEBUG) |
| (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on, |
| sizeof(on)); |
| #endif |
| if (op & USAGE_OP_BYPASS_ROUTE) |
| (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on, |
| sizeof(on)); |
| |
| sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); |
| |
| #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| #if defined(IP_OPTIONS) |
| if (lsrr > 0) { |
| unsigned char optlist[MAX_IPOPTLEN]; |
| |
| /* final hop */ |
| gwlist[lsrr] = to->sin_addr.s_addr; |
| ++lsrr; |
| |
| /* force 4 byte alignment */ |
| optlist[0] = IPOPT_NOP; |
| /* loose source route option */ |
| optlist[1] = IPOPT_LSRR; |
| i = lsrr * sizeof(gwlist[0]); |
| optlist[2] = i + 3; |
| /* Pointer to LSRR addresses */ |
| optlist[3] = IPOPT_MINOFF; |
| memcpy(optlist + 4, gwlist, i); |
| |
| if ((setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS, |
| (char *)optlist, i + sizeof(gwlist[0]))) < 0) { |
| bb_perror_msg_and_die("IP_OPTIONS"); |
| } |
| } |
| #endif /* IP_OPTIONS */ |
| #endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */ |
| |
| #ifdef SO_SNDBUF |
| if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen, |
| sizeof(packlen)) < 0) { |
| bb_perror_msg_and_die("SO_SNDBUF"); |
| } |
| #endif |
| #ifdef IP_HDRINCL |
| if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on, |
| sizeof(on)) < 0 && errno != ENOPROTOOPT) { |
| bb_perror_msg_and_die("IP_HDRINCL"); |
| } |
| #else |
| #ifdef IP_TOS |
| if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, |
| (char *)&tos, sizeof(tos)) < 0) { |
| bb_perror_msg_and_die("setsockopt tos %d", tos); |
| } |
| #endif |
| #endif |
| #if TRACEROUTE_SO_DEBUG |
| if (op & USAGE_OP_DEBUG) |
| (void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on, |
| sizeof(on)); |
| #endif |
| if (op & USAGE_OP_BYPASS_ROUTE) |
| (void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on, |
| sizeof(on)); |
| |
| /* Revert to non-privileged user after opening sockets */ |
| xsetgid(getgid()); |
| xsetuid(getuid()); |
| |
| outip = (struct ip *)xzalloc(packlen); |
| |
| outip->ip_v = IPVERSION; |
| if (tos_str) |
| outip->ip_tos = tos; |
| outip->ip_len = htons(packlen); |
| outip->ip_off = htons(off); |
| outp = (unsigned char *)(outip + 1); |
| outip->ip_dst = to->sin_addr; |
| |
| outip->ip_hl = (outp - (unsigned char *)outip) >> 2; |
| ident = (getpid() & 0xffff) | 0x8000; |
| #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
| if (useicmp) { |
| outip->ip_p = IPPROTO_ICMP; |
| |
| outicmp = (struct icmp *)outp; |
| outicmp->icmp_type = ICMP_ECHO; |
| outicmp->icmp_id = htons(ident); |
| outdata = (struct outdata *)(outp + 8); /* XXX magic number */ |
| } else |
| #endif |
| { |
| outip->ip_p = IPPROTO_UDP; |
| |
| outudp = (struct udphdr *)outp; |
| outudp->source = htons(ident); |
| outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen))); |
| outdata = (struct outdata *)(outudp + 1); |
| } |
| |
| /* Get the interface address list */ |
| n = ifaddrlist(&al); |
| |
| /* Look for a specific device */ |
| if (device != NULL) { |
| for (i = n; i > 0; --i, ++al) |
| if (strcmp(device, al->device) == 0) |
| break; |
| if (i <= 0) { |
| bb_error_msg_and_die("can't find interface %s", device); |
| } |
| } |
| |
| /* Determine our source address */ |
| if (source == NULL) { |
| /* |
| * If a device was specified, use the interface address. |
| * Otherwise, try to determine our source address. |
| */ |
| if (device != NULL) |
| setsin(from, al->addr); |
| findsaddr(to, from); |
| } else { |
| hi = gethostinfo(source); |
| source = hi->name; |
| hi->name = NULL; |
| /* |
| * If the device was specified make sure it |
| * corresponds to the source address specified. |
| * Otherwise, use the first address (and warn if |
| * there are more than one). |
| */ |
| if (device != NULL) { |
| for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap) |
| if (*ap == al->addr) |
| break; |
| if (i <= 0) { |
| bb_error_msg_and_die( |
| "%s is not on interface %s", |
| source, device); |
| } |
| setsin(from, *ap); |
| } else { |
| setsin(from, hi->addrs[0]); |
| if (hi->n > 1) |
| bb_error_msg( |
| "Warning: %s has multiple addresses; using %s", |
| source, inet_ntoa(from->sin_addr)); |
| } |
| freehostinfo(hi); |
| } |
| |
| outip->ip_src = from->sin_addr; |
| #ifndef IP_HDRINCL |
| xbind(sndsock, (struct sockaddr *)from, sizeof(*from)); |
| #endif |
| |
| fprintf(stderr, "traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr)); |
| if (source) |
| fprintf(stderr, " from %s", source); |
| fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen); |
| (void)fflush(stderr); |
| |
| for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { |
| u_int32_t lastaddr = 0; |
| int gotlastaddr = 0; |
| int got_there = 0; |
| int unreachable = 0; |
| int sentfirst = 0; |
| |
| printf("%2d ", ttl); |
| for (probe = 0; probe < nprobes; ++probe) { |
| int cc; |
| struct timeval t1, t2; |
| struct timezone tz; |
| struct ip *ip; |
| |
| if (sentfirst && pausemsecs > 0) |
| usleep(pausemsecs * 1000); |
| (void)gettimeofday(&t1, &tz); |
| send_probe(++seq, ttl, &t1); |
| ++sentfirst; |
| while ((cc = wait_for_reply(s, from, &t1)) != 0) { |
| (void)gettimeofday(&t2, &tz); |
| i = packet_ok(packet, cc, from, seq); |
| /* Skip short packet */ |
| if (i == 0) |
| continue; |
| if (!gotlastaddr || |
| from->sin_addr.s_addr != lastaddr) { |
| print(packet, cc, from); |
| lastaddr = from->sin_addr.s_addr; |
| ++gotlastaddr; |
| } |
| printf(" %.3f ms", deltaT(&t1, &t2)); |
| ip = (struct ip *)packet; |
| if (op & USAGE_OP_TTL_FLAG) |
| printf(" (%d)", ip->ip_ttl); |
| if (i == -2) { |
| if (ip->ip_ttl <= 1) |
| printf(" !"); |
| ++got_there; |
| break; |
| } |
| /* time exceeded in transit */ |
| if (i == -1) |
| break; |
| code = i - 1; |
| switch (code) { |
| |
| case ICMP_UNREACH_PORT: |
| if (ip->ip_ttl <= 1) |
| printf(" !"); |
| ++got_there; |
| break; |
| |
| case ICMP_UNREACH_NET: |
| ++unreachable; |
| printf(" !N"); |
| break; |
| |
| case ICMP_UNREACH_HOST: |
| ++unreachable; |
| printf(" !H"); |
| break; |
| |
| case ICMP_UNREACH_PROTOCOL: |
| ++got_there; |
| printf(" !P"); |
| break; |
| |
| case ICMP_UNREACH_NEEDFRAG: |
| ++unreachable; |
| printf(" !F-%d", pmtu); |
| break; |
| |
| case ICMP_UNREACH_SRCFAIL: |
| ++unreachable; |
| printf(" !S"); |
| break; |
| |
| case ICMP_UNREACH_FILTER_PROHIB: |
| case ICMP_UNREACH_NET_PROHIB: /* misuse */ |
| ++unreachable; |
| printf(" !A"); |
| break; |
| |
| case ICMP_UNREACH_HOST_PROHIB: |
| ++unreachable; |
| printf(" !C"); |
| break; |
| |
| case ICMP_UNREACH_HOST_PRECEDENCE: |
| ++unreachable; |
| printf(" !V"); |
| break; |
| |
| case ICMP_UNREACH_PRECEDENCE_CUTOFF: |
| ++unreachable; |
| printf(" !C"); |
| break; |
| |
| case ICMP_UNREACH_NET_UNKNOWN: |
| case ICMP_UNREACH_HOST_UNKNOWN: |
| ++unreachable; |
| printf(" !U"); |
| break; |
| |
| case ICMP_UNREACH_ISOLATED: |
| ++unreachable; |
| printf(" !I"); |
| break; |
| |
| case ICMP_UNREACH_TOSNET: |
| case ICMP_UNREACH_TOSHOST: |
| ++unreachable; |
| printf(" !T"); |
| break; |
| |
| default: |
| ++unreachable; |
| printf(" !<%d>", code); |
| break; |
| } |
| break; |
| } |
| if (cc == 0) |
| printf(" *"); |
| (void)fflush(stdout); |
| } |
| putchar('\n'); |
| if (got_there || |
| (unreachable > 0 && unreachable >= nprobes - 1)) |
| break; |
| } |
| return 0; |
| } |