diff options
Diffstat (limited to 'networking/traceroute.c')
| -rw-r--r-- | networking/traceroute.c | 1546 |
1 files changed, 1202 insertions, 344 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c index 628b134..15d55e7 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -1,44 +1,181 @@ -/*- - * Copyright (c) 1990, 1993 +/* + * 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 <dzo@simtreas.ru> * - * 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. 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. */ +//#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 @@ -54,169 +191,537 @@ * 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 CONFIG_FEATURE_TRACEROUTE_VERBOSE #undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */ +#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 <stdio.h> #include <errno.h> +#include <memory.h> +#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> -#include <sys/time.h> -#include "inet_common.h" +#include <fcntl.h> +#include <malloc.h> #include <netdb.h> #include <endian.h> +#include <getopt.h> + +#include <sys/param.h> +#include <sys/file.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/time.h> /* concession to AIX */ +#include <sys/select.h> +#include "inet_common.h" + +#include <net/if.h> +#include <netinet/in.h> +#include <arpa/inet.h> #include <netinet/udp.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> +#include "busybox.h" -#define MAXPACKET 65535 /* max ip packet size */ -#ifndef MAXHOSTNAMELEN -#define MAXHOSTNAMELEN 64 -#endif /* - * format of a (udp) probe packet. + * Definitions for internet protocol version 4. + * Per RFC 791, September 1981. */ -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 */ +#define IPVERSION 4 + +/* + * Overlay for ip header used by other protocols (tcp, udp). + */ +struct ipovly { + u_char ih_x1[9]; /* (unused) */ + u_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 */ }; /* - * Definitions for internet protocol version 4. - * Per RFC 791, September 1981. + * UDP kernel structures and variables. */ -#define IPVERSION 4 +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 -#include "busybox.h" +/* Host name and address list */ +struct hostinfo { + char *name; + int n; + u_int32_t *addrs; +}; + +/* Data section of the probe packet */ +struct outdata { + u_char seq; /* sequence number of this packet */ + u_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 u_char packet[512] __attribute__ ((aligned)); -static struct opacket *outpacket; /* last output (udp) packet */ +/* last inbound (icmp) packet */ +static u_char packet[512] __attribute__((align (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 */ + +#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP +static struct icmp *outicmp; /* last output (icmp) packet */ +#endif + +#ifdef CONFIG_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) socket file descriptor */ +static int sndsock; /* send (udp/icmp) socket file descriptor */ -static struct sockaddr whereto; /* Who to try to reach */ -static int datalen; /* How much data */ +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 const char devnull[] = "/dev/null"; -static int max_ttl = 30; static u_short ident; -static u_short port = 32768+666; /* start udp dest port # for probe packets */ +static u_short 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 */ + +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE +static int optlen; /* length of ip options */ +#else +#define optlen 0 +#endif + +#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP +static int useicmp; /* use icmp echo instead of udp packets */ +#endif #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 */ /* - * Construct an Internet address representation. - * If the nflag has been supplied, give - * numeric value, otherwise try for symbolic name. + * Return the interface list */ -static inline void -inetname(struct sockaddr_in *from) +static int +ifaddrlist(struct IFADDRLIST **ipaddrp) { - char *cp; - static char domain[MAXHOSTNAMELEN + 1]; - char name[MAXHOSTNAMELEN + 1]; - static int first = 1; - const char *ina; + 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; - if (first && !nflag) { - first = 0; - if (getdomainname(domain, MAXHOSTNAMELEN) != 0) - domain[0] = 0; + fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd < 0) + bb_perror_msg_and_die("socket"); + + 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)", + sizeof(ibuf)); + else + bb_perror_msg_and_die("SIOCGIFCONF"); } - 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; + ifrp = ibuf; + ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); + + nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq)); + st_ifaddrlist = xcalloc(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; } - ina = inet_ntoa(from->sin_addr); - if (nflag) - printf(" %s", ina); - else - printf(" %s (%s)", (cp ? cp : ina), ina); + if(nipaddr == 0) + bb_error_msg_and_die ("Can't find any network interfaces"); + (void)close(fd); + + *ipaddrp = st_ifaddrlist; + return nipaddr; } -static inline void -print(u_char *buf, int cc, struct sockaddr_in *from) + +static void +setsin(struct sockaddr_in *addr_sin, u_int32_t addr) { - struct ip *ip; - int hlen; + 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; +} - ip = (struct ip *) buf; - hlen = ip->ip_hl << 2; - cc -= hlen; - inetname(from); -#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE - if (verbose) - printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); -#endif +/* + * 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 = bb_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); } -static inline double -deltaT(struct timeval *t1p, struct timeval *t2p) +/* +"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]" + +*/ + +/* String to value with optional min and max. Handles decimal and hex. */ +static int +str2val(const char *str, const char *what, int mi, int ma) { - double dt; + const char *cp; + int val; + char *ep; - dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + - (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; - return (dt); + if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) { + cp = str + 2; + val = (int)strtol(cp, &ep, 16); + } else + val = (int)strtol(str, &ep, 10); + if (*ep != '\0') { + bb_error_msg_and_die("\"%s\" bad value for %s \n", str, what); + } + if (val < mi && mi >= 0) { + if (mi == 0) + bb_error_msg_and_die("%s must be >= %d\n", what, mi); + else + bb_error_msg_and_die("%s must be > %d\n", what, mi - 1); + } + if (val > ma && ma >= 0) + bb_error_msg_and_die("%s must be <= %d\n", what, ma); + return val; } -static inline int -wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer) + +/* + * 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; - static struct timeval wait; + struct timeval now, wait; + struct timezone tz; int cc = 0; - int fromlen = sizeof (*from); + socklen_t fromlen = sizeof(*fromp); 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; + + wait.tv_sec = tp->tv_sec + waittime; + wait.tv_usec = tp->tv_usec; + (void)gettimeofday(&now, &tz); + tvsub(&wait, &now); + + if (select(sock + 1, &fds, NULL, NULL, &wait) > 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 u_short +in_cksum(u_short *addr, int len) +{ + int nleft = len; + u_short *w = addr; + u_short 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 += *(u_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((u_short *)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)); + +#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP + if (useicmp) + outicmp->icmp_seq = htons(seq); + else +#endif + outudp->dest = htons(port + seq); + +#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP + if (useicmp) { + /* Always calculate checksum for icmp packets */ + outicmp->icmp_cksum = 0; + outicmp->icmp_cksum = in_cksum((u_short *)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((u_short *)ui, packlen); + if (outudp->check == 0) + outudp->check = 0xffff; + *outip = tip; + } + +#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE + /* XXX undocumented debugging hack */ + if (verbose > 1) { + const u_short *sp; + int nshorts, i; + + sp = (u_short *)outip; + nshorts = (u_int)packlen / sizeof(u_short); + 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", *(u_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", + bb_applet_name, hostname, packlen, cc); + (void)fflush(stdout); } +} - 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); +static inline double +deltaT(struct timeval *t1p, struct timeval *t2p) +{ + double dt; - return(cc); + dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + + (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; + return dt; } #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE @@ -229,19 +734,19 @@ pr_type(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", + "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 > 18) + return "OUT-OF-RANGE"; - return(ttab[t]); + return ttab[t]; } #endif -static inline int +static int packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq) { struct icmp *icp; @@ -257,293 +762,646 @@ packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq) 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; + 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_UNREACH || type == ICMP_ECHOREPLY) { 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 CONFIG_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 *)((u_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 *)((u_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); + } } #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE if (verbose) { int i; - u_long *lp = (u_long *)&icp->icmp_ip; + 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(long)) - printf("%2d: x%8.8lx\n", i, *lp++); + 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); + return 0; } -static void /* not inline */ -send_probe(int seq, int ttl) + +/* + * 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) { - struct opacket *op = outpacket; - struct ip *ip = &op->ip; - struct udphdr *up = &op->udp; - int i; - struct timezone tz; + const char *n = NULL; + const char *ina; + char name[257]; - 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); + 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(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; -int -#ifndef CONFIG_TRACEROUTE -main(int argc, char *argv[]) -#else -traceroute_main(int argc, char *argv[]) + inetname(from); +#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE + if (verbose) + printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); #endif +} + + +static struct hostinfo * +gethostinfo(const char *host) { - extern char *optarg; - extern int optind; + int n; struct hostent *hp; - struct sockaddr_in from, *to; - int ch, i, on, probe, seq, tos, ttl; + struct hostinfo *hi; + char **p; + u_int32_t addr, *ap; + + hi = xcalloc(1, sizeof(*hi)); + addr = inet_addr(host); + if ((int32_t)addr != -1) { + hi->name = bb_xstrdup(host); + hi->n = 1; + hi->addrs = xcalloc(1, 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 = bb_xstrdup(hp->h_name); + for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p) + continue; + hi->n = n; + hi->addrs = xcalloc(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) +{ + if (hi->name != NULL) { + free(hi->name); + hi->name = NULL; + } + free((char *)hi->addrs); + free((char *)hi); +} + +#ifdef CONFIG_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 options = 0; /* socket options */ - char *source = 0; +int +traceroute_main(int argc, char *argv[]) +{ + int code, n; + char *cp; + u_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 on = 1; + struct protoent *pe; + int ttl, probe, i; + int seq = 0; + int tos = 0; + char *tos_str = NULL; + char *source = NULL; + unsigned long op; + +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE + int lsrr = 0; +#endif + u_short off = 0; + struct IFADDRLIST *al; + int uid = getuid(); + 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; +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE + llist_t *sourse_route_list = NULL; +#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; + opterr = 0; +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE + bb_opt_complementally = "x-x:g*"; +#else + bb_opt_complementally = "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': + + op = bb_getopt_ulflags(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 */ + +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE + "g:" +#endif + , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str, + &source, &waittime_str, &pausemsecs_str, &first_ttl_str +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE + , &sourse_route_list +#endif + ); + + if(op & USAGE_OP_DONT_FRAGMNT) + off = IP_DF; +#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP + useicmp = op & USAGE_OP_USE_ICMP; +#endif + nflag = op & USAGE_OP_ADDR_NUM; #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE - verbose++; + verbose = op & USAGE_OP_VERBOSE; #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(); + if(op & USAGE_OP_IP_CHKSUM) { + doipcksum = 0; + bb_error_msg("Warning: ip checksums disabled"); + } + if (tos_str) + tos = str2val(tos_str, "tos", 0, 255); + if(max_ttl_str) + max_ttl = str2val(max_ttl_str, "max ttl", 1, 255); + if(port_str) + port = (u_short)str2val(port_str, "port", 1, (1 << 16) - 1); + if(nprobes_str) + nprobes = str2val(optarg, "nprobes", 1, -1); + if(source) { + /* + * set the ip source address of the outbound + * probe (e.g., on a multi-homed host). + */ + if (uid) + bb_error_msg_and_die("-s %s: Permission denied", source); + } + if(waittime_str) + waittime = str2val(waittime_str, "wait time", 2, 24 * 60 * 60); + if(pausemsecs_str) + pausemsecs = str2val(pausemsecs_str, "pause msecs", 0, 60 * 60 * 1000); + if(first_ttl_str) + first_ttl = str2val(first_ttl_str, "first ttl", 1, 255); + +#ifdef CONFIG_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; } - argc -= optind; - argv += optind; + 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; + +#ifdef CONFIG_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 = str2val(argv[optind + 1], + "packet length", minpacket, maxpacket); + /* Fall through */ - if (argc < 1) + 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(); + } - 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.", - (int)(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; + cp = "icmp"; + if ((pe = getprotobyname(cp)) == NULL) + bb_perror_msg_and_die("unknown protocol %s", cp); - ident = (getpid() & 0xffff) | 0x8000; + /* Insure the socket fds won't be 0, 1 or 2 */ + do n = bb_xopen(devnull, O_RDONLY); while (n < 2); + if (n > 2) + close(n); - if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) + if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 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)); + if (op & USAGE_OP_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)); + if (op & USAGE_OP_BYPASS_ROUTE) + (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on, + sizeof(on)); + + sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); + if (sndsock < 0) + bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket); + +#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE +#if defined(IP_OPTIONS) + if (lsrr > 0) { + u_char optlist[MAX_IPOPTLEN]; + + cp = "ip"; + if ((pe = getprotobyname(cp)) == NULL) + bb_perror_msg_and_die("unknown protocol"); + + /* 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, pe->p_proto, 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, (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) + 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 #ifdef CONFIG_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) - 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 (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 */ + setgid(getgid()); + setuid(uid); + + outip = (struct ip *)xcalloc(1, (unsigned)packlen); + + outip->ip_v = IPVERSION; + if (tos_str) + outip->ip_tos = tos; + outip->ip_len = htons(packlen); + outip->ip_off = htons(off); + outp = (u_char *)(outip + 1); + outip->ip_dst = to->sin_addr; + + outip->ip_hl = (outp - (u_char *)outip) >> 2; + ident = (getpid() & 0xffff) | 0x8000; +#ifdef CONFIG_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((u_short)(packlen - (sizeof(*outip) + optlen))); + outdata = (struct outdata *)(outudp + 1); } - fprintf(stderr, "traceroute to %s (%s)", hostname, - inet_ntoa(to->sin_addr)); + /* 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 + if (bind(sndsock, (struct sockaddr *)from, sizeof(*from)) < 0) { + bb_perror_msg_and_die("bind"); + } +#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, datalen); + fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen); + (void)fflush(stderr); - for (ttl = 1; ttl <= max_ttl; ++ttl) { - u_long lastaddr = 0; + 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, reset_timer; + int cc; 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; - } + 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; - } else - reset_timer = 0; + + 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); + (void)fflush(stdout); } putchar('\n'); - if (got_there || unreachable >= nprobes-1) - return 0; + if (got_there || + (unreachable > 0 && unreachable >= nprobes - 1)) + break; } - return 0; } |