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Diffstat (limited to 'traceroute.c')
| -rw-r--r-- | traceroute.c | 652 |
1 files changed, 0 insertions, 652 deletions
diff --git a/traceroute.c b/traceroute.c deleted file mode 100644 index a3abd0a..0000000 --- a/traceroute.c +++ /dev/null @@ -1,652 +0,0 @@ -/*- - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Van Jacobson. - * - * Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 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. 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. - */ - -/* - * traceroute host - trace the route ip packets follow going to "host". - * 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.) - * - * 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@helios.ee.lbl.gov) - * Tue Dec 20 03:50:13 PST 1988 - */ - -#undef BB_FEATURE_TRACEROUTE_VERBOSE -//#define BB_FEATURE_TRACEROUTE_VERBOSE -#undef BB_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */ - -#include <stdio.h> -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/time.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netdb.h> -#include <endian.h> -#include <arpa/inet.h> -#include <netinet/udp.h> -#include <netinet/ip.h> -#include <netinet/ip_icmp.h> - - - /* It turns out that libc5 doesn't have proper icmp support - * built into it header files, so we have to supplement it */ -#if __GNU_LIBRARY__ < 5 -static const int ICMP_MINLEN = 8; /* abs minimum */ - -struct icmp_ra_addr -{ - u_int32_t ira_addr; - u_int32_t ira_preference; -}; - - -struct icmp -{ - u_int8_t icmp_type; /* type of message, see below */ - u_int8_t icmp_code; /* type sub code */ - u_int16_t icmp_cksum; /* ones complement checksum of struct */ - union - { - u_char ih_pptr; /* ICMP_PARAMPROB */ - struct in_addr ih_gwaddr; /* gateway address */ - struct ih_idseq /* echo datagram */ - { - u_int16_t icd_id; - u_int16_t icd_seq; - } ih_idseq; - u_int32_t ih_void; - - /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ - struct ih_pmtu - { - u_int16_t ipm_void; - u_int16_t ipm_nextmtu; - } ih_pmtu; - - struct ih_rtradv - { - u_int8_t irt_num_addrs; - u_int8_t irt_wpa; - u_int16_t irt_lifetime; - } ih_rtradv; - } icmp_hun; -#define icmp_pptr icmp_hun.ih_pptr -#define icmp_gwaddr icmp_hun.ih_gwaddr -#define icmp_id icmp_hun.ih_idseq.icd_id -#define icmp_seq icmp_hun.ih_idseq.icd_seq -#define icmp_void icmp_hun.ih_void -#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void -#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu -#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs -#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa -#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime - union - { - struct - { - u_int32_t its_otime; - u_int32_t its_rtime; - u_int32_t its_ttime; - } id_ts; - struct - { - struct ip idi_ip; - /* options and then 64 bits of data */ - } id_ip; - struct icmp_ra_addr id_radv; - u_int32_t id_mask; - u_int8_t id_data[1]; - } icmp_dun; -#define icmp_otime icmp_dun.id_ts.its_otime -#define icmp_rtime icmp_dun.id_ts.its_rtime -#define icmp_ttime icmp_dun.id_ts.its_ttime -#define icmp_ip icmp_dun.id_ip.idi_ip -#define icmp_radv icmp_dun.id_radv -#define icmp_mask icmp_dun.id_mask -#define icmp_data icmp_dun.id_data -}; - -#define ICMP_MINLEN 8 /* abs minimum */ -#define ICMP_UNREACH 3 /* dest unreachable, codes: */ -#define ICMP_TIMXCEED 11 /* time exceeded, code: */ -#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ -#define ICMP_UNREACH_NET 0 /* bad net */ -#define ICMP_UNREACH_HOST 1 /* bad host */ -#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ -#define ICMP_UNREACH_PORT 3 /* bad port */ -#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ -#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ -#endif - - -#define MAXPACKET 65535 /* max ip packet size */ -#ifndef MAXHOSTNAMELEN -#define MAXHOSTNAMELEN 64 -#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 */ -}; - -/* - * Definitions for internet protocol version 4. - * Per RFC 791, September 1981. - */ -#define IPVERSION 4 - - -#include "busybox.h" - -static u_char packet[512]; /* last inbound (icmp) packet */ -static struct opacket *outpacket; /* last output (udp) packet */ - -static int s; /* receive (icmp) socket file descriptor */ -static int sndsock; /* send (udp) socket file descriptor */ - -static struct sockaddr whereto; /* Who to try to reach */ -static int datalen; /* How much data */ - -static char *hostname; - -static int max_ttl = 30; -static u_short ident; -static u_short port = 32768+666; /* start udp dest port # for probe packets */ - -#ifdef BB_FEATURE_TRACEROUTE_VERBOSE -static int verbose; -#endif -static int waittime = 5; /* time to wait for response (in seconds) */ -static int nflag; /* print addresses numerically */ - -/* - * 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) -{ - char *cp; - struct hostent *hp; - static char domain[MAXHOSTNAMELEN + 1]; - static int first = 1; - const char *ina; - - if (first && !nflag) { - first = 0; - if (gethostname(domain, MAXHOSTNAMELEN) == 0 && - (cp = strchr(domain, '.'))) - (void) strcpy(domain, cp + 1); - else - domain[0] = 0; - } - cp = 0; - if (!nflag && from->sin_addr.s_addr != INADDR_ANY) { - hp = gethostbyaddr((char *)&(from->sin_addr), sizeof (from->sin_addr), AF_INET); - if (hp) { - if ((cp = strchr(hp->h_name, '.')) && - !strcmp(cp + 1, domain)) - *cp = 0; - cp = (char *)hp->h_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; - - inetname(from); -#ifdef BB_FEATURE_TRACEROUTE_VERBOSE - if (verbose) - printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); -#endif -} - -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) -{ - fd_set fds; - static struct timeval wait; - int cc = 0; - int fromlen = sizeof (*from); - - 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; - } - - 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); - - return(cc); -} - -#ifdef BB_FEATURE_TRACEROUTE_VERBOSE -/* - * Convert an ICMP "type" field to a printable string. - */ -static inline const char * -pr_type(t) - u_char t; -{ - 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", - "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", - "Info Reply" - }; - - if(t > 16) - return("OUT-OF-RANGE"); - - return(ttab[t]); -} -#endif - -static inline int -packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq) -{ - struct icmp *icp; - u_char type, code; - int hlen; - struct ip *ip; - - ip = (struct ip *) buf; - hlen = ip->ip_hl << 2; - if (cc < hlen + ICMP_MINLEN) { -#ifdef BB_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; - if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || - type == ICMP_UNREACH) { - struct ip *hip; - 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); - } -#ifdef BB_FEATURE_TRACEROUTE_VERBOSE - if (verbose) { - int i; - u_long *lp = (u_long *)&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(long)) - printf("%2d: x%8.8lx\n", i, *lp++); - } -#endif - return(0); -} - -static void /* not inline */ -send_probe(int seq, int ttl) -{ - 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); - } -} - - -int -#ifndef BB_TRACEROUTE -main(argc, argv) -#else -traceroute_main(argc, argv) -#endif - int argc; - char *argv[]; -{ - 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; - int nprobes = 3; - - 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 BB_FEATURE_TRACEROUTE_SO_DEBUG - options |= SO_DEBUG; -#endif - break; - case 'm': - max_ttl = atoi(optarg); - if (max_ttl <= 1) - error_msg_and_die("max ttl must be >1."); - break; - case 'n': - nflag++; - break; - case 'p': - port = atoi(optarg); - if (port < 1) - error_msg_and_die("port must be >0."); - break; - case 'q': - nprobes = atoi(optarg); - if (nprobes < 1) - 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) - error_msg_and_die("tos must be 0 to 255."); - break; - case 'v': -#ifdef BB_FEATURE_TRACEROUTE_VERBOSE - verbose++; -#endif - break; - case 'w': - waittime = atoi(optarg); - if (waittime <= 1) - error_msg_and_die("wait must be >1 sec."); - break; - default: - show_usage(); - } - argc -= optind; - argv += optind; - - if (argc < 1) - show_usage(); - - 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)) - 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) - perror_msg_and_die(can_not_create_raw_socket); - - s = create_icmp_socket(); - -#ifdef BB_FEATURE_TRACEROUTE_SO_DEBUG - if (options & SO_DEBUG) - (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, - (char *)&on, sizeof(on)); -#endif - if (options & SO_DONTROUTE) - (void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE, - (char *)&on, sizeof(on)); -#ifdef SO_SNDBUF - if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, - sizeof(datalen)) < 0) - perror_msg_and_die("SO_SNDBUF"); -#endif SO_SNDBUF -#ifdef IP_HDRINCL - if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on, - sizeof(on)) < 0) - perror_msg_and_die("IP_HDRINCL"); -#endif IP_HDRINCL -#ifdef BB_FEATURE_TRACEROUTE_SO_DEBUG - if (options & SO_DEBUG) - (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, - (char *)&on, sizeof(on)); -#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) - 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) - perror_msg_and_die("bind"); -#endif IP_HDRINCL - } - - 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); - - for (ttl = 1; ttl <= max_ttl; ++ttl) { - u_long lastaddr = 0; - int got_there = 0; - int unreachable = 0; - - printf("%2d ", ttl); - for (probe = 0; probe < nprobes; ++probe) { - int cc, reset_timer; - struct timeval t1, t2; - struct timezone tz; - struct ip *ip; - - (void) gettimeofday(&t1, &tz); - 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; - } - break; - } else - reset_timer = 0; - } - if (cc == 0) - printf(" *"); - (void) fflush(stdout); - } - putchar('\n'); - if (got_there || unreachable >= nprobes-1) - exit(0); - } - - return 0; -} |