Add the capability for traceroute(8) to send packets of any IP protocol
instead of just UDP; an alternate protocol is specified by '-P proto'. This is useful for finding routers that are blocking packets based on IP protocol. New handlers can be added fairly easily to do protocol- specific things.
This commit is contained in:
Archie Cobbs
parent
6e19760bfa
commit
f5004fb09b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=46542
@ -13,7 +13,7 @@
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.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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.\" WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" $Header: /home/ncvs/src/contrib/traceroute/traceroute.8,v 1.2 1996/10/08 02:44:23 sef Exp $
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.\" $Header: /home/ncvs/src/contrib/traceroute/traceroute.8,v 1.3 1998/01/09 18:46:53 steve Exp $
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.\"
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.TH TRACEROUTE 8 "27 September 1996"
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.UC 6
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@ -35,24 +35,29 @@ max_ttl
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.br
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.ti +8
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[
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.B \-P
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.I proto
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] [
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.B \-p
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.I port
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] [
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.B \-q
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.I nqueries
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] [
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.B \-s
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.I src_addr
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]
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.br
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.ti +8
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[
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.B \-s
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.I src_addr
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] [
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.B \-t
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.I tos
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] [
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.B \-w
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.I waittime
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]
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.br
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.ti +8
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.I host
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[
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.I packetlen
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@ -91,8 +96,18 @@ Print hop addresses numerically rather than symbolically and numerically
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(saves a nameserver address-to-name lookup for each gateway found on the
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path).
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.TP
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.B \-P
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Send packets of specified IP protocol. The currently supported protocols
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are: UDP, TCP and GRE. Other protocols may also be specified (either by
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name or by number), though
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.I traceroute
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does not implement any special knowledge of their packet formats. This
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option is useful for determining which router along a path may be
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blocking packets based on IP protocol number. But see BUGS below.
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.TP
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.B \-p
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Set the base UDP port number used in probes (default is 33434).
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Protocol specific. For UDP and TCP, sets
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the base port number used in probes (default is 33434).
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Traceroute hopes that nothing is listening on UDP ports
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.I base
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to
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@ -298,4 +313,13 @@ The current version is available via anonymous ftp:
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.I ftp://ftp.ee.lbl.gov/traceroute.tar.Z
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.RE
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.SH BUGS
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When using protocols other than UDP, functionality is reduced.
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In particular, the last packet will often appear to be lost, because
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even though it reaches the destination host, there's no way to know
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that because no ICMP message is sent back.
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In the TCP case,
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.I traceroute
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should listen for a RST from the destination host (or an intermediate
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router that's filtering packets), but this is not implemented yet.
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.PP
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Please send bug reports to traceroute@ee.lbl.gov.
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@ -24,7 +24,7 @@ static const char copyright[] =
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"@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996\n\
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The Regents of the University of California. All rights reserved.\n";
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static const char rcsid[] =
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"@(#)$Header: /home/ncvs/src/contrib/traceroute/traceroute.c,v 1.7 1999/02/15 08:11:44 des Exp $ (LBL)";
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"@(#)$Header: /home/ncvs/src/contrib/traceroute/traceroute.c,v 1.8 1999/02/16 14:19:50 des Exp $ (LBL)";
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#endif
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/*
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@ -213,6 +213,7 @@ static const char rcsid[] =
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/udp.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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@ -243,6 +244,20 @@ static const char rcsid[] =
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#define Fprintf (void)fprintf
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#define Printf (void)printf
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/* What a GRE packet header looks like */
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struct grehdr {
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u_int16_t flags;
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u_int16_t proto;
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u_int16_t length; /* PPTP version of these fields */
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u_int16_t callId;
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};
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47
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#endif
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/* For GRE, we prepare what looks like a PPTP packet */
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#define GRE_PPTP_PROTO 0x880b
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/* Data section of the probe packet */
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struct outdata {
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u_char seq; /* sequence number of this packet */
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@ -250,11 +265,22 @@ struct outdata {
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struct timeval tv; /* time packet left */
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};
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/* Descriptor structure for each outgoing protocol we support */
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struct outproto {
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char *name; /* name of protocol */
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u_char num; /* IP protocol number */
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u_short hdrlen; /* max size of protocol header */
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u_short port; /* default base protocol-specific "port" */
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void (*prepare)(struct outdata *);
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/* finish preparing an outgoing packet */
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int (*check)(const u_char *, int);
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/* check an incoming packet */
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};
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u_char packet[512]; /* last inbound (icmp) packet */
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struct ip *outip; /* last output (udp) packet */
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struct udphdr *outudp; /* last output (udp) packet */
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struct outdata *outdata; /* last output (udp) packet */
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struct ip *outip; /* last output ip packet */
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u_char *outprot; /* last output inner protocol packet */
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/* loose source route gateway list (including room for final destination) */
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u_int32_t gwlist[NGATEWAYS + 1];
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@ -264,6 +290,7 @@ int sndsock; /* send (udp) socket file descriptor */
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struct sockaddr whereto; /* Who to try to reach */
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int packlen; /* total length of packet */
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int protlen; /* length of protocol part of packet */
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int maxpacket = 32 * 1024; /* max ip packet size */
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char *prog;
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@ -273,7 +300,7 @@ char *hostname;
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int nprobes = 3;
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int max_ttl = 30;
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u_short ident;
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u_short port = 32768 + 666; /* start udp dest port # for probe packets */
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u_short port; /* protocol specific base "port" */
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int options; /* socket options */
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int verbose;
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@ -294,11 +321,58 @@ void print(u_char *, int, struct sockaddr_in *);
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char *getaddr(u_int32_t *, char *);
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char *getsin(struct sockaddr_in *, char *);
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char *savestr(const char *);
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void send_probe(int, int, struct timeval *);
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void send_probe(int, int);
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void tvsub(struct timeval *, struct timeval *);
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__dead void usage(void);
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int wait_for_reply(int, struct sockaddr_in *, struct timeval *);
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void udp_prep(struct outdata *);
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int udp_check(const u_char *, int);
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void tcp_prep(struct outdata *);
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int tcp_check(const u_char *, int);
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void gre_prep(struct outdata *);
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int gre_check(const u_char *, int);
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void gen_prep(struct outdata *);
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int gen_check(const u_char *, int);
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/* List of supported protocols. The first one is the default. The last
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one is the handler for generic protocols not explicitly listed. */
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struct outproto protos[] = {
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{
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"udp",
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IPPROTO_UDP,
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sizeof(struct udphdr),
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32768 + 666,
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udp_prep,
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udp_check
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},
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{
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"tcp",
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IPPROTO_TCP,
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sizeof(struct tcphdr),
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32768 + 666,
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tcp_prep,
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tcp_check
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},
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{
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"gre",
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IPPROTO_GRE,
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sizeof(struct grehdr),
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GRE_PPTP_PROTO,
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gre_prep,
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gre_check
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},
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{
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NULL,
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0,
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2 * sizeof(u_short),
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0,
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gen_prep,
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gen_check
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},
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};
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struct outproto *proto = &protos[0];
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int
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main(int argc, char **argv)
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{
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@ -338,7 +412,7 @@ main(int argc, char **argv)
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prog = argv[0];
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opterr = 0;
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while ((op = getopt(argc, argv, "Sdnrvg:m:p:q:s:t:w:")) != EOF)
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while ((op = getopt(argc, argv, "Sdnrvg:m:P:p:q:s:t:w:")) != EOF)
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switch (op) {
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case 'S':
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@ -372,6 +446,36 @@ main(int argc, char **argv)
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++nflag;
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break;
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case 'P':
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for (i = 0; protos[i].name != NULL; i++) {
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if (strcasecmp(protos[i].name, optarg) == 0) {
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proto = &protos[i];
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break;
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}
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}
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if (protos[i].name == NULL) { /* generic handler */
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struct protoent *pe;
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u_long pnum;
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char *eptr;
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/* Determine the IP protocol number */
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if ((pe = getprotobyname(optarg)) != NULL)
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pnum = pe->p_proto;
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else {
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pnum = strtoul(optarg, &eptr, 10);
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if (pnum > 0xff
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|| *optarg == '\0'
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|| *eptr != '\0') {
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Fprintf(stderr, "%s: unknown "
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"protocol \"%s\"\n",
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prog, optarg);
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exit(1);
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}
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}
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proto->num = pnum;
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}
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break;
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case 'p':
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port = atoi(optarg);
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if (port <= 0) {
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@ -451,7 +555,7 @@ main(int argc, char **argv)
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if (lsrr > 0)
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optlen = (lsrr + 1) * sizeof(gwlist[0]);
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i = sizeof(*outip) + sizeof(*outudp) + sizeof(*outdata) + optlen;
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i = sizeof(*outip) + proto->hdrlen + sizeof(struct outdata) + optlen;
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if (packlen == 0)
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packlen = i; /* minimum sized packet */
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else if (i > packlen || packlen > maxpacket) {
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@ -459,6 +563,7 @@ main(int argc, char **argv)
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prog, i, maxpacket);
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exit(1);
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}
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protlen = packlen - sizeof(*outip) - optlen;
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outip = (struct ip *)malloc((unsigned)packlen);
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if (outip == NULL) {
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@ -474,14 +579,14 @@ main(int argc, char **argv)
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#else
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outip->ip_len = packlen;
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#endif
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outip->ip_p = IPPROTO_UDP;
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outudp = (struct udphdr *)(outip + 1);
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outip->ip_p = proto->num;
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outprot = (u_char *)(outip + 1);
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#ifdef HAVE_RAW_OPTIONS
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if (lsrr > 0) {
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register u_char *optlist;
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optlist = (u_char *)outudp;
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(u_char *)outudp += optlen;
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optlist = (u_char *)outprot;
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(u_char *)outprot += optlen;
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/* final hop */
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gwlist[lsrr] = to->sin_addr.s_addr;
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@ -501,13 +606,9 @@ main(int argc, char **argv)
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#endif
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outip->ip_dst = to->sin_addr;
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outip->ip_hl = ((u_char *)outudp - (u_char *)outip) >> 2;
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outip->ip_hl = ((u_char *)outprot - (u_char *)outip) >> 2;
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ident = (getpid() & 0xffff) | 0x8000;
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outudp->uh_sport = htons(ident);
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outudp->uh_ulen = htons((u_short)(packlen - (sizeof(*outip) + optlen)));
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outdata = (struct outdata *)(outudp + 1);
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if (pe == NULL) {
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Fprintf(stderr, "%s: unknown protocol %s\n", prog, cp);
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@ -616,9 +717,21 @@ main(int argc, char **argv)
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struct timeval t1, t2;
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struct timezone tz;
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register struct ip *ip;
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struct outdata outdata;
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/* Prepare outgoing data */
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outdata.seq = ++seq;
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outdata.ttl = ttl;
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/* Avoid alignment problems by copying bytewise: */
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(void)gettimeofday(&t1, &tz);
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send_probe(++seq, ttl, &t1);
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memcpy(&outdata.tv, &t1, sizeof(outdata.tv));
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/* Finalize and send packet */
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(*proto->prepare)(&outdata);
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send_probe(seq, ttl);
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/* Wait for a reply */
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while ((cc = wait_for_reply(s, &from, &t1)) != 0) {
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double T;
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int precis;
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@ -753,21 +866,13 @@ wait_for_reply(register int sock, register struct sockaddr_in *fromp,
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}
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void
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send_probe(register int seq, register int ttl, register struct timeval *tp)
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send_probe(int seq, int ttl)
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{
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register int i;
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outip->ip_ttl = ttl;
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outip->ip_id = htons(ident + seq);
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outudp->uh_dport = htons(port + seq);
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outdata->seq = seq;
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outdata->ttl = ttl;
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/* Avoid alignment problems by copying bytewise: */
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memcpy(&outdata->tv, tp, sizeof(outdata->tv));
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i = sendto(sndsock, (char *)outip, packlen, 0, &whereto,
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sizeof(whereto));
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if (i < 0 || i != packlen) {
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@ -838,14 +943,14 @@ packet_ok(register u_char *buf, int cc, register struct sockaddr_in *from,
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if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
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type == ICMP_UNREACH) {
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struct ip *hip;
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struct udphdr *up;
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u_char *inner;
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hip = &icp->icmp_ip;
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hlen = hip->ip_hl << 2;
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up = (struct udphdr *)((u_char *)hip + hlen);
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if (hlen + 12 <= cc && hip->ip_p == IPPROTO_UDP &&
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up->uh_sport == htons(ident) &&
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up->uh_dport == htons(port + seq))
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inner = (u_char *)((u_char *)hip + hlen);
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if (hlen + 12 <= cc
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&& hip->ip_p == proto->num
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&& (*proto->check)(inner, seq))
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return (type == ICMP_TIMXCEED ? -1 : code + 1);
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}
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#ifndef ARCHAIC
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@ -863,6 +968,84 @@ packet_ok(register u_char *buf, int cc, register struct sockaddr_in *from,
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return(0);
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}
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void
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udp_prep(struct outdata *outdata)
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{
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struct udphdr *const udp = (struct udphdr *) outprot;
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udp->uh_sport = htons(ident);
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udp->uh_dport = htons(port + outdata->seq);
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udp->uh_ulen = htons((u_short)protlen);
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}
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int
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udp_check(const u_char *data, int seq)
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{
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struct udphdr *const udp = (struct udphdr *) data;
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return (ntohs(udp->uh_sport) == ident
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&& ntohs(udp->uh_dport) == port + seq);
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}
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void
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tcp_prep(struct outdata *outdata)
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{
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struct tcphdr *const tcp = (struct tcphdr *) outprot;
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tcp->th_sport = htons(ident);
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tcp->th_dport = htons(port + outdata->seq);
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tcp->th_seq = (tcp->th_sport << 16) | tcp->th_dport;
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tcp->th_ack = 0;
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tcp->th_off = 5;
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tcp->th_flags = TH_SYN;
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}
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int
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tcp_check(const u_char *data, int seq)
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{
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struct tcphdr *const tcp = (struct tcphdr *) data;
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return (ntohs(tcp->th_sport) == ident
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&& ntohs(tcp->th_dport) == port + seq);
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}
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void
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gre_prep(struct outdata *outdata)
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{
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struct grehdr *const gre = (struct grehdr *) outprot;
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gre->flags = htons(0x2001);
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gre->proto = htons(port);
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gre->length = 0;
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gre->callId = htons(ident + outdata->seq);
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}
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int
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gre_check(const u_char *data, int seq)
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{
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struct grehdr *const gre = (struct grehdr *) data;
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return(ntohs(gre->proto) == port
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&& ntohs(gre->callId) == ident + seq);
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}
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void
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gen_prep(struct outdata *outdata)
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{
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u_int16_t *const ptr;
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ptr[0] = htons(ident);
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ptr[1] = htons(port + outdata->seq);
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}
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int
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gen_check(const u_char *data, int seq)
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{
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u_int16_t *const ptr = (u_int16_t *) data;
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return(ntohs(ptr[0]) == ident
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&& ntohs(ptr[1]) == port + seq);
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}
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void
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print(register u_char *buf, register int cc, register struct sockaddr_in *from)
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Reference in New Issue
Block a user