From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/networking/traceroute.c | 1200 +++++++++++++------- 1 file changed, 789 insertions(+), 411 deletions(-) (limited to 'release/src/router/busybox/networking/traceroute.c') diff --git a/release/src/router/busybox/networking/traceroute.c b/release/src/router/busybox/networking/traceroute.c index 5f8989fd..7284f002 100644 --- a/release/src/router/busybox/networking/traceroute.c +++ b/release/src/router/busybox/networking/traceroute.c @@ -1,44 +1,179 @@ -/*- - * Copyright (c) 1990, 1993 +/* 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. * - * This code is derived from software contributed to Berkeley by - * Van Jacobson. + * Busybox port by Vladimir Oleynik (C) 2005 * - * Special for busybox ported by Vladimir Oleynik 2001 * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. + * 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. */ /* * 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 @@ -54,495 +189,738 @@ * back to yourself. Unfortunately, SO many gateways botch source * routing, the thing is almost worthless. Maybe one day... * - * -- Van Jacobson (van@helios.ee.lbl.gov) + * -- Van Jacobson (van@ee.lbl.gov) * Tue Dec 20 03:50:13 PST 1988 */ -#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE +#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_SO_DEBUG /* not in documentation man */ - -#include -#include -#include -#include -#include -#include -#include "inet_common.h" -#include -#include +//#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 +#include +#include #include #include #include - -#define MAXPACKET 65535 /* max ip packet size */ -#ifndef MAXHOSTNAMELEN -#define MAXHOSTNAMELEN 64 +#include "libbb.h" +#include "inet_common.h" + +#ifndef IPPROTO_ICMP +# define IPPROTO_ICMP 1 +#endif +#ifndef IPPROTO_IP +# define IPPROTO_IP 0 #endif -/* - * format of a (udp) probe packet. - */ -struct opacket { - struct ip ip; - struct udphdr udp; - u_char seq; /* sequence number of this packet */ - u_char ttl; /* ttl packet left with */ - struct timeval tv; /* time packet left */ +/* Keep in sync with getopt32 call! */ +enum { + OPT_DONT_FRAGMNT = (1 << 0), /* F */ + OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */ + OPT_TTL_FLAG = (1 << 2), /* l */ + OPT_ADDR_NUM = (1 << 3), /* n */ + OPT_BYPASS_ROUTE = (1 << 4), /* r */ + OPT_DEBUG = (1 << 5), /* d */ + OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */ + OPT_IP_CHKSUM = (1 << 7), /* x */ + OPT_TOS = (1 << 8), /* t */ + OPT_DEVICE = (1 << 9), /* i */ + OPT_MAX_TTL = (1 << 10), /* m */ + OPT_PORT = (1 << 11), /* p */ + OPT_NPROBES = (1 << 12), /* q */ + OPT_SOURCE = (1 << 13), /* s */ + OPT_WAITTIME = (1 << 14), /* w */ + OPT_PAUSE_MS = (1 << 15), /* z */ + OPT_FIRST_TTL = (1 << 16), /* f */ }; +#define verbose (option_mask32 & OPT_VERBOSE) -/* - * Definitions for internet protocol version 4. - * Per RFC 791, September 1981. - */ -#define IPVERSION 4 - - -#include "busybox.h" +enum { + SIZEOF_ICMP_HDR = 8, + rcvsock = 3, /* receive (icmp) socket file descriptor */ + sndsock = 4, /* send (udp/icmp) socket file descriptor */ +}; -static u_char packet[512]; /* last inbound (icmp) packet */ -static struct opacket *outpacket; /* last output (udp) packet */ +/* Data section of the probe packet */ +struct outdata_t { + unsigned char seq; /* sequence number of this packet */ + unsigned char ttl; /* ttl packet left with */ +// UNUSED. Retaining to have the same packet size. + struct timeval tv_UNUSED PACKED; /* time packet left */ +}; -static int s; /* receive (icmp) socket file descriptor */ -static int sndsock; /* send (udp) socket file descriptor */ +struct globals { + struct ip *outip; + struct outdata_t *outdata; + len_and_sockaddr *dest_lsa; + int packlen; /* total length of packet */ + int pmtu; /* Path MTU Discovery (RFC1191) */ + uint16_t ident; + uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */ + int waittime; // 5; /* time to wait for response (in seconds) */ +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + int optlen; /* length of ip options */ +#else +#define optlen 0 +#endif + unsigned char recv_pkt[512]; /* last inbound (icmp) packet */ +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + /* Maximum number of gateways (include room for one noop) */ +#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t))) + /* loose source route gateway list (including room for final destination) */ + uint32_t gwlist[NGATEWAYS + 1]; +#endif +}; -static struct sockaddr whereto; /* Who to try to reach */ -static int datalen; /* How much data */ +#define G (*ptr_to_globals) +#define outip (G.outip ) +#define outdata (G.outdata ) +#define dest_lsa (G.dest_lsa ) +#define packlen (G.packlen ) +#define pmtu (G.pmtu ) +#define ident (G.ident ) +#define port (G.port ) +#define waittime (G.waittime ) +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE +# define optlen (G.optlen ) +#endif +#define recv_pkt (G.recv_pkt ) +#define gwlist (G.gwlist ) +#define INIT_G() do { \ + SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ + port = 32768 + 666; \ + waittime = 5; \ +} while (0) -static char *hostname; +#define outicmp ((struct icmp *)(outip + 1)) +#define outudp ((struct udphdr *)(outip + 1)) -static int max_ttl = 30; -static u_short ident; -static u_short port = 32768+666; /* start udp dest port # for probe packets */ -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE -static int verbose; -#endif -static int waittime = 5; /* time to wait for response (in seconds) */ -static int nflag; /* print addresses numerically */ +static int +wait_for_reply(struct sockaddr_in *fromp) +{ + struct pollfd pfd[1]; + int cc = 0; + socklen_t fromlen = sizeof(*fromp); + + pfd[0].fd = rcvsock; + pfd[0].events = POLLIN; + if (safe_poll(pfd, 1, waittime * 1000) > 0) + cc = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0, + (struct sockaddr *)fromp, &fromlen); + return cc; +} /* - * Construct an Internet address representation. - * If the nflag has been supplied, give - * numeric value, otherwise try for symbolic name. + * Checksum routine for Internet Protocol family headers (C Version) */ -static inline void -inetname(struct sockaddr_in *from) +static uint16_t +in_cksum(uint16_t *addr, int len) { - char *cp; - static char domain[MAXHOSTNAMELEN + 1]; - char name[MAXHOSTNAMELEN + 1]; - static int first = 1; - const char *ina; - - if (first && !nflag) { - first = 0; - if (getdomainname(domain, MAXHOSTNAMELEN) != 0) - domain[0] = 0; + 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; } - cp = 0; - if (!nflag && from->sin_addr.s_addr != INADDR_ANY) { - if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0) { - if ((cp = strchr(name, '.')) && - !strcmp(cp + 1, domain)) - *cp = 0; - cp = (char *)name; - } - } - ina = inet_ntoa(from->sin_addr); - if (nflag) - printf(" %s", ina); - else - printf(" %s (%s)", (cp ? cp : ina), ina); -} - -static inline void -print(u_char *buf, int cc, struct sockaddr_in *from) -{ - struct ip *ip; - int hlen; - ip = (struct ip *) buf; - hlen = ip->ip_hl << 2; - cc -= hlen; + /* mop up an odd byte, if necessary */ + if (nleft == 1) + sum += *(unsigned char *)w; - inetname(from); -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE - if (verbose) - printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); -#endif + /* 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 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); -} - -static inline int -wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer) +static void +send_probe(int seq, int ttl) { - fd_set fds; - static struct timeval wait; - int cc = 0; - int fromlen = sizeof (*from); + int len, res; + void *out; + + /* Payload */ + outdata->seq = seq; + outdata->ttl = ttl; +// UNUSED: was storing gettimeofday's result there, but never ever checked it + /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/ + + if (option_mask32 & OPT_USE_ICMP) { + outicmp->icmp_seq = htons(seq); + + /* 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; + } - FD_ZERO(&fds); - FD_SET(sock, &fds); - if (reset_timer) { - /* - * traceroute could hang if someone else has a ping - * running and our ICMP reply gets dropped but we don't - * realize it because we keep waking up to handle those - * other ICMP packets that keep coming in. To fix this, - * "reset_timer" will only be true if the last packet that - * came in was for us or if this is the first time we're - * waiting for a reply since sending out a probe. Note - * that this takes advantage of the select() feature on - * Linux where the remaining timeout is written to the - * struct timeval area. - */ - wait.tv_sec = waittime; - wait.tv_usec = 0; +//BUG! verbose is (x & OPT_VERBOSE), not a counter! +#if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE + /* XXX undocumented debugging hack */ + if (verbose > 1) { + const uint16_t *sp; + int nshorts, i; + + sp = (uint16_t *)outip; + nshorts = (unsigned)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 (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) - cc=recvfrom(s, (char *)packet, sizeof(packet), 0, - (struct sockaddr *)from, &fromlen); +#if 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 - return(cc); + len = packlen - sizeof(*outip); + if (option_mask32 & OPT_USE_ICMP) + out = outicmp; + else { + out = outdata; + len -= sizeof(*outudp); + set_nport(dest_lsa, htons(port + seq)); + } + res = xsendto(sndsock, out, len, + (struct sockaddr *)&dest_lsa->u.sa, dest_lsa->len); + if (res != len) { + bb_info_msg("sent %d octets, ret=%d", len, res); + } } -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE +#if ENABLE_FEATURE_TRACEROUTE_VERBOSE /* * Convert an ICMP "type" field to a printable string. */ static inline const char * -pr_type(u_char t) +pr_type(unsigned char t) { - static const char * const ttab[] = { + static const char *const ttab[] = { "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", "Source Quench", "Redirect", "ICMP 6", "ICMP 7", - "Echo", "ICMP 9", "ICMP 10", "Time Exceeded", + "Echo", "Router Advert", "Router Solicit", "Time Exceeded", "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", - "Info Reply" + "Info Reply", "Mask Request", "Mask Reply" }; - if(t > 16) - return("OUT-OF-RANGE"); + if (t >= ARRAY_SIZE(ttab)) + return "OUT-OF-RANGE"; - return(ttab[t]); + return ttab[t]; } #endif -static inline int -packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq) +#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE +#define packet_ok(cc, from, seq) \ + packet_ok(cc, seq) +#endif +static int +packet_ok(int cc, const struct sockaddr_in *from, int seq) { - struct icmp *icp; - u_char type, code; + const struct icmp *icp; + unsigned char type, code; int hlen; - struct ip *ip; + const struct ip *ip; - ip = (struct ip *) buf; + ip = (struct ip *) recv_pkt; hlen = ip->ip_hl << 2; if (cc < hlen + ICMP_MINLEN) { -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE +#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); + return 0; } cc -= hlen; - icp = (struct icmp *)(buf + hlen); - type = icp->icmp_type; code = icp->icmp_code; - if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || - type == ICMP_UNREACH) { - struct ip *hip; - struct udphdr *up; + icp = (struct icmp *)(recv_pkt + hlen); + type = icp->icmp_type; + code = icp->icmp_code; + /* Path MTU Discovery (RFC1191) */ + pmtu = 0; + if (code == ICMP_UNREACH_NEEDFRAG) + pmtu = ntohs(icp->icmp_nextmtu); + + if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) + || type == ICMP_UNREACH + || type == ICMP_ECHOREPLY + ) { + const struct ip *hip; + const struct udphdr *up; hip = &icp->icmp_ip; hlen = hip->ip_hl << 2; - up = (struct udphdr *)((u_char *)hip + hlen); - 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 (option_mask32 & OPT_USE_ICMP) { + 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); + if (hlen + SIZEOF_ICMP_HDR <= cc + && hip->ip_p == IPPROTO_ICMP + && hicmp->icmp_id == htons(ident) + && hicmp->icmp_seq == htons(seq) + ) { + return (type == ICMP_TIMXCEED ? -1 : code + 1); + } + } else { + up = (struct udphdr *)((char *)hip + hlen); + if (hlen + 12 <= cc + && hip->ip_p == IPPROTO_UDP +// Off: since we do not form the entire IP packet, +// but defer it to kernel, we can't set source port, +// and thus can't check it here in the reply + /* && up->source == htons(ident) */ + && up->dest == htons(port + seq) + ) { + return (type == ICMP_TIMXCEED ? -1 : code + 1); + } + } } -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE +#if ENABLE_FEATURE_TRACEROUTE_VERBOSE if (verbose) { int i; - u_long *lp = (u_long *)&icp->icmp_ip; + uint32_t *lp = (uint32_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), + 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(long)) - printf("%2d: x%8.8lx\n", i, *lp++); + for (i = 4; i < cc; i += sizeof(*lp)) + printf("%2d: x%8.8x\n", i, *lp++); } #endif - return(0); + return 0; } -static void /* not inline */ -send_probe(int seq, int ttl) +/* + * Construct an Internet address representation. + * If the -n flag has been supplied, give + * numeric value, otherwise try for symbolic name. + */ +static void +print_inetname(const struct sockaddr_in *from) { - struct opacket *op = outpacket; - struct ip *ip = &op->ip; - struct udphdr *up = &op->udp; - int i; - struct timezone tz; - - ip->ip_off = 0; - ip->ip_hl = sizeof(*ip) >> 2; - ip->ip_p = IPPROTO_UDP; - ip->ip_len = datalen; - ip->ip_ttl = ttl; - ip->ip_v = IPVERSION; - ip->ip_id = htons(ident+seq); - - up->source = htons(ident); - up->dest = htons(port+seq); - up->len = htons((u_short)(datalen - sizeof(struct ip))); - up->check = 0; - - op->seq = seq; - op->ttl = ttl; - (void) gettimeofday(&op->tv, &tz); - - i = sendto(sndsock, (char *)outpacket, datalen, 0, &whereto, - sizeof(struct sockaddr)); - if (i < 0 || i != datalen) { - if (i<0) - perror("sendto"); - printf("traceroute: wrote %s %d chars, ret=%d\n", hostname, - datalen, i); - (void) fflush(stdout); + const char *ina; + + ina = inet_ntoa(from->sin_addr); + if (option_mask32 & OPT_ADDR_NUM) + printf(" %s", ina); + else { + char *n = NULL; + if (from->sin_addr.s_addr != INADDR_ANY) + n = xmalloc_sockaddr2host_noport((struct sockaddr*)from); + printf(" %s (%s)", (n ? n : ina), ina); + free(n); } } +static void +print(int cc, const struct sockaddr_in *from) +{ + print_inetname(from); + if (verbose) { + const struct ip *ip; + int hlen; -int -#ifndef CONFIG_TRACEROUTE -main(int argc, char *argv[]) -#else -traceroute_main(int argc, char *argv[]) -#endif + ip = (struct ip *) recv_pkt; + hlen = ip->ip_hl << 2; + cc -= hlen; + printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst)); + } +} + +static void +print_delta_ms(unsigned t1p, unsigned t2p) { - extern char *optarg; - extern int optind; - struct hostent *hp; - struct sockaddr_in from, *to; - int ch, i, on, probe, seq, tos, ttl; - - int options = 0; /* socket options */ - char *source = 0; + unsigned tt = t2p - t1p; + printf(" %u.%03u ms", tt / 1000, tt % 1000); +} + +/* +Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl] +[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos] +[-w waittime] [-z pausemsecs] host [packetlen]" +*/ + +int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int traceroute_main(int argc, char **argv) +{ + int minpacket; + int ttl, i; + int seq = 0; + int tos = 0; + int max_ttl = 30; int nprobes = 3; + int first_ttl = 1; + unsigned pausemsecs = 0; + unsigned op; + char *source; + char *device; + char *tos_str; + char *max_ttl_str; + char *port_str; + char *nprobes_str; + char *waittime_str; + char *pausemsecs_str; + char *first_ttl_str; +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + llist_t *source_route_list = NULL; + int lsrr = 0; +#endif - on = 1; - seq = tos = 0; - to = (struct sockaddr_in *)&whereto; - while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:v")) != EOF) - switch(ch) { - case 'd': -#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG - options |= SO_DEBUG; + INIT_G(); + +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + opt_complementary = "x-x:g::"; +#else + opt_complementary = "x-x"; #endif - break; - case 'm': - max_ttl = atoi(optarg); - if (max_ttl <= 1) - bb_error_msg_and_die("max ttl must be >1."); - break; - case 'n': - nflag++; - break; - case 'p': - port = atoi(optarg); - if (port < 1) - bb_error_msg_and_die("port must be >0."); - break; - case 'q': - nprobes = atoi(optarg); - if (nprobes < 1) - bb_error_msg_and_die("nprobes must be >0."); - break; - case 'r': - options |= SO_DONTROUTE; - break; - case 's': - /* - * set the ip source address of the outbound - * probe (e.g., on a multi-homed host). - */ - source = optarg; - break; - case 't': - tos = atoi(optarg); - if (tos < 0 || tos > 255) - bb_error_msg_and_die("tos must be 0 to 255."); - break; - case 'v': -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE - verbose++; + + op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + "g:" #endif - break; - case 'w': - waittime = atoi(optarg); - if (waittime <= 1) - bb_error_msg_and_die("wait must be >1 sec."); - break; - default: - bb_show_usage(); + , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str + , &source, &waittime_str, &pausemsecs_str, &first_ttl_str +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + , &source_route_list +#endif + ); + +#if 0 /* IGNORED */ + if (op & OPT_IP_CHKSUM) + bb_error_msg("warning: ip checksums disabled"); +#endif + if (op & OPT_TOS) + tos = xatou_range(tos_str, 0, 255); + if (op & OPT_MAX_TTL) + max_ttl = xatou_range(max_ttl_str, 1, 255); + if (op & OPT_PORT) + port = xatou16(port_str); + if (op & OPT_NPROBES) + nprobes = xatou_range(nprobes_str, 1, INT_MAX); + if (op & OPT_SOURCE) { + /* + * set the ip source address of the outbound + * probe (e.g., on a multi-homed host). + */ + if (getuid() != 0) + bb_error_msg_and_die("you must be root to use -s"); + } + if (op & OPT_WAITTIME) + waittime = xatou_range(waittime_str, 1, 24 * 60 * 60); + if (op & OPT_PAUSE_MS) + pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000); + if (op & OPT_FIRST_TTL) + first_ttl = xatou_range(first_ttl_str, 1, max_ttl); + +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE + if (source_route_list) { + while (source_route_list) { + len_and_sockaddr *lsa; + + if (lsrr >= NGATEWAYS) + bb_error_msg_and_die("no more than %d gateways", NGATEWAYS); + lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET); + gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr; + free(lsa); + ++lsrr; } - argc -= optind; - argv += optind; + optlen = (lsrr + 1) * sizeof(gwlist[0]); + } +#endif + + minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen; + if (!(op & OPT_USE_ICMP)) + minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR; + packlen = minpacket; - if (argc < 1) + /* Process destination and optional packet size */ + argv += optind; + argc -= optind; + switch (argc) { + case 2: + packlen = xatoul_range(argv[1], minpacket, 32 * 1024); + /* Fall through */ + case 1: + dest_lsa = xhost2sockaddr(argv[0], port); + break; + default: bb_show_usage(); + } + + /* Ensure the socket fds won't be 0, 1 or 2 */ + bb_sanitize_stdio(); - setlinebuf (stdout); - - memset(&whereto, 0, sizeof(struct sockaddr)); - hp = xgethostbyname(*argv); - to->sin_family = hp->h_addrtype; - memcpy(&to->sin_addr, hp->h_addr, hp->h_length); - hostname = (char *)hp->h_name; - if (*++argv) - datalen = atoi(*argv); - if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) - bb_error_msg_and_die("packet size must be 0 <= s < %d.", - MAXPACKET - sizeof(struct opacket)); - datalen += sizeof(struct opacket); - outpacket = (struct opacket *)xmalloc((unsigned)datalen); - memset(outpacket, 0, datalen); - outpacket->ip.ip_dst = to->sin_addr; - outpacket->ip.ip_tos = tos; - outpacket->ip.ip_v = IPVERSION; - outpacket->ip.ip_id = 0; - - ident = (getpid() & 0xffff) | 0x8000; - - if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) - bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket); - - s = create_icmp_socket(); - -#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG - if (options & SO_DEBUG) - (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, - (char *)&on, sizeof(on)); + xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock); +#if TRACEROUTE_SO_DEBUG + if (op & OPT_DEBUG) + setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, + &const_int_1, sizeof(const_int_1)); #endif - if (options & SO_DONTROUTE) - (void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE, - (char *)&on, sizeof(on)); + if (op & OPT_BYPASS_ROUTE) + setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, + &const_int_1, sizeof(const_int_1)); + + if (op & OPT_USE_ICMP) + xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock); + else + xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock); +#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE +#if defined(IP_OPTIONS) + if (lsrr > 0) { + unsigned char optlist[MAX_IPOPTLEN]; + + /* final hop */ + gwlist[lsrr] = dest_lsa->u.sin.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 *)&datalen, - sizeof(datalen)) < 0) + if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &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) - bb_perror_msg_and_die("IP_HDRINCL"); +#ifdef IP_TOS + if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { + bb_perror_msg_and_die("setsockopt tos %d", tos); + } #endif -#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG - if (options & SO_DEBUG) - (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, - (char *)&on, sizeof(on)); +#ifdef IP_DONTFRAG + if (op & OPT_DONT_FRAGMNT) + setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG, + &const_int_1, sizeof(const_int_1)); #endif - if (options & SO_DONTROUTE) - (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, - (char *)&on, sizeof(on)); - - if (source) { - memset(&from, 0, sizeof(struct sockaddr)); - from.sin_family = AF_INET; - from.sin_addr.s_addr = inet_addr(source); - if (from.sin_addr.s_addr == -1) - bb_error_msg_and_die("unknown host %s", source); - outpacket->ip.ip_src = from.sin_addr; -#ifndef IP_HDRINCL - if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0) - bb_perror_msg_and_die("bind"); +#if TRACEROUTE_SO_DEBUG + if (op & OPT_DEBUG) + setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, + &const_int_1, sizeof(const_int_1)); #endif + if (op & OPT_BYPASS_ROUTE) + setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, + &const_int_1, sizeof(const_int_1)); + + outip = xzalloc(packlen); + + if (op & OPT_USE_ICMP) { + ident = getpid() | 0x8000; + outicmp->icmp_type = ICMP_ECHO; + outicmp->icmp_id = htons(ident); + outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR); + } else { + outdata = (struct outdata_t *)(outudp + 1); } - 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, datalen); + if (op & OPT_DEVICE) /* hmm, do we need error check? */ + setsockopt_bindtodevice(sndsock, device); + + if (op & OPT_SOURCE) { + len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0); + /* Ping does this (why?) */ + if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF, + &source_lsa->u.sa, source_lsa->len)) + bb_error_msg_and_die("can't set multicast source interface"); +//TODO: we can query source port we bound to, +// and check it in replies... if we care enough + xbind(sndsock, &source_lsa->u.sa, source_lsa->len); + free(source_lsa); + } - for (ttl = 1; ttl <= max_ttl; ++ttl) { - u_long lastaddr = 0; + /* Revert to non-privileged user after opening sockets */ + xsetgid(getgid()); + xsetuid(getuid()); + + printf("traceroute to %s (%s)", argv[0], + xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa)); + if (op & OPT_SOURCE) + printf(" from %s", source); + printf(", %d hops max, %d byte packets\n", max_ttl, packlen); + + for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { +//TODO: make it protocol agnostic (get rid of sockaddr_in) + struct sockaddr_in from; + uint32_t lastaddr = 0; + int probe; + int unreachable = 0; /* counter */ + int gotlastaddr = 0; /* flags */ int got_there = 0; - int unreachable = 0; + int first = 1; - printf("%2d ", ttl); + printf("%2d", ttl); for (probe = 0; probe < nprobes; ++probe) { - int cc, reset_timer; - struct timeval t1, t2; - struct timezone tz; + int cc; + unsigned t1; + unsigned t2; struct ip *ip; - (void) gettimeofday(&t1, &tz); + if (!first && pausemsecs > 0) + usleep(pausemsecs * 1000); + fflush(stdout); + + t1 = monotonic_us(); send_probe(++seq, ttl); - reset_timer = 1; - while ((cc = wait_for_reply(s, &from, reset_timer)) != 0) { - (void) gettimeofday(&t2, &tz); - if ((i = packet_ok(packet, cc, &from, seq))) { - reset_timer = 1; - if (from.sin_addr.s_addr != lastaddr) { - print(packet, cc, &from); - lastaddr = from.sin_addr.s_addr; - } - printf(" %g ms", deltaT(&t1, &t2)); - switch(i - 1) { - case ICMP_UNREACH_PORT: - ip = (struct ip *)packet; - 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"); - break; - case ICMP_UNREACH_SRCFAIL: - ++unreachable; - printf(" !S"); - break; - } + first = 0; + + while ((cc = wait_for_reply(&from)) != 0) { + t2 = monotonic_us(); + i = packet_ok(cc, &from, seq); + /* Skip short packet */ + if (i == 0) + continue; + if (!gotlastaddr + || from.sin_addr.s_addr != lastaddr + ) { + print(cc, &from); + lastaddr = from.sin_addr.s_addr; + gotlastaddr = 1; + } + print_delta_ms(t1, t2); + ip = (struct ip *)recv_pkt; + if (op & OPT_TTL_FLAG) + printf(" (%d)", ip->ip_ttl); + if (i == -2) { + if (ip->ip_ttl <= 1) + printf(" !"); + got_there = 1; + break; + } + /* time exceeded in transit */ + if (i == -1) + break; + i--; + switch (i) { + case ICMP_UNREACH_PORT: + if (ip->ip_ttl <= 1) + printf(" !"); + got_there = 1; + break; + case ICMP_UNREACH_NET: + printf(" !N"); + ++unreachable; + break; + case ICMP_UNREACH_HOST: + printf(" !H"); + ++unreachable; + break; + case ICMP_UNREACH_PROTOCOL: + printf(" !P"); + got_there = 1; + break; + case ICMP_UNREACH_NEEDFRAG: + printf(" !F-%d", pmtu); + ++unreachable; + break; + case ICMP_UNREACH_SRCFAIL: + printf(" !S"); + ++unreachable; + break; + case ICMP_UNREACH_FILTER_PROHIB: + case ICMP_UNREACH_NET_PROHIB: /* misuse */ + printf(" !A"); + ++unreachable; + break; + case ICMP_UNREACH_HOST_PROHIB: + printf(" !C"); + ++unreachable; break; - } else - reset_timer = 0; + case ICMP_UNREACH_HOST_PRECEDENCE: + printf(" !V"); + ++unreachable; + break; + case ICMP_UNREACH_PRECEDENCE_CUTOFF: + printf(" !C"); + ++unreachable; + break; + case ICMP_UNREACH_NET_UNKNOWN: + case ICMP_UNREACH_HOST_UNKNOWN: + printf(" !U"); + ++unreachable; + break; + case ICMP_UNREACH_ISOLATED: + printf(" !I"); + ++unreachable; + break; + case ICMP_UNREACH_TOSNET: + case ICMP_UNREACH_TOSHOST: + printf(" !T"); + ++unreachable; + break; + default: + printf(" !<%d>", i); + ++unreachable; + break; + } + break; } if (cc == 0) - printf(" *"); - (void) fflush(stdout); + printf(" *"); + } + bb_putchar('\n'); + if (got_there + || (unreachable > 0 && unreachable >= nprobes - 1) + ) { + break; } - putchar('\n'); - if (got_there || unreachable >= nprobes-1) - return 0; } - return 0; } -- cgit v1.2.3-54-g00ecf