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Fetch the default maximum TTL value from the net.inet.ip.ttl MIB.

Browse Source 
PR:		bin/19598
MFC after:	1 week
This commit is contained in:
Ruslan Ermilov 2001-06-06 16:12:59 +00:00
parent 7b4d3c72cc
commit 3c5021685e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77816
3 changed files with 31 additions and 11 deletions
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12
contrib/traceroute/traceroute.8
View File

@ -97,7 +97,9 @@ The default is 1, i.e., start with the first hop.
.TP
.B \-m
Set the max time-to-live (max number of hops) used in outgoing probe
packets. The default is 30 hops (the same default used for TCP
packets. The default is
.I net.inet.ip.ttl
hops (the same default used for TCP
connections).
.TP
.B \-n
@ -173,7 +175,9 @@ 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
defaults to
.I net.inet.ip.ttl
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
@ -192,7 +196,7 @@ A sample use and output might be:
.RS
.nf
[yak 71]% traceroute nis.nsf.net.
traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 38 byte packet
traceroute to nis.nsf.net (35.1.1.48), 64 hops max, 38 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
@ -219,7 +223,7 @@ A more interesting example is:
.RS
.nf
[yak 72]% traceroute allspice.lcs.mit.edu.
traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
traceroute to allspice.lcs.mit.edu (18.26.0.115), 64 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

27
contrib/traceroute/traceroute.c
View File

@ -40,9 +40,9 @@ static const char rcsid[] =
* 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
* defaults to net.inet.ip.ttl 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
@ -57,7 +57,7 @@ static const char rcsid[] =
* 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
* traceroute to nis.nsf.net (35.1.1.48), 64 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
@ -77,7 +77,7 @@ static const char rcsid[] =
* 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
* traceroute to allspice.lcs.mit.edu (18.26.0.115), 64 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
@ -209,6 +209,9 @@ static const char rcsid[] =
#include <sys/select.h>
#endif
#include <sys/socket.h>
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#include <sys/time.h>
#include <netinet/in_systm.h>
@ -308,7 +311,7 @@ char *hostname;
int nprobes = 3;
int min_ttl = 1;
int max_ttl = 30;
int max_ttl;
u_short ident;
u_short port; /* protocol specific base "port" */
@ -420,6 +423,18 @@ main(int argc, char **argv)
setuid(getuid());
#ifdef IPCTL_DEFTTL
{
int mib[4] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DEFTTL };
size_t sz = sizeof(max_ttl);
if (sysctl(mib, 4, &max_ttl, &sz, NULL, 0) == -1)
err(1, "sysctl(net.inet.ip.ttl)");
}
#else
max_ttl = 30;
#endif
if ((cp = strrchr(argv[0], '/')) != NULL)
prog = cp + 1;
else

3
usr.sbin/traceroute/Makefile
View File

@ -3,7 +3,8 @@
PROG= traceroute
MAN= traceroute.8
BINMODE=4555
CFLAGS+=-DHAVE_SYS_SELECT_H=1 -DHAVE_SETLINEBUF=1 -DHAVE_RAW_OPTIONS=1 \
CFLAGS+=-DHAVE_SYS_SELECT_H=1 -DHAVE_SYS_SYSCTL_H=1 \
-DHAVE_SETLINEBUF=1 -DHAVE_RAW_OPTIONS=1 \
-DSTDC_HEADERS=1
.ifndef (NOIPSEC)
CFLAGS+=-DIPSEC