Rationale is that error(...) will prefix the error message with the
program name which is useful information now that mtr is split into
two executables (mtr and mtr-packet.)
In mtr 0.87 it was possible to start mtr against unreachable
host (that local kernel already knew that it is unreachable).
Later it was broken. Make such tracing possible again.
Under Linux Vserver SOCK_RAW is quite limited. Only IPPROTO_ICMP works,
so try to use it.
check_length_order() also doesn't work because sendto is also limited.
Fortunately under linux check_length_order is not needed as described
in comment around check_length_order.
Chonggang Li [Mon, 21 Aug 2017 20:34:45 +0000 (13:34 -0700)]
mtr-packet: fix compilation on OS X
Error queue is not supported by OS X, use AC_CHECK_HEADERS to introduce
a compilation flag called HAVE_LINUX_ERRQUEUE_H to skip compiling errqueue
related code.
Chonggang Li [Thu, 13 Jul 2017 23:17:08 +0000 (16:17 -0700)]
mtr-packet: use ICMP and UDP without privilege on linux
This commit enables non-privileged users to use mtr on linux without
setuid. Currently ICMP and UDP protocols are supported in this commit.
Previously, to use mtr on linux with protocol ICMP and UDP, RAW sockets
have to be opened to send out packets and receive ICMP errors, so users
must have RAW socket permission to use this program. The goal of this
commit is to make mtr usable for normal users without RAW socket
permission. The changes include:
(1) The origianl logic is not changed, but instead, when the program
fails to open RAW sockets, it will fallback to opening DGRAM scoekts.
(2) A new flag is created to indicate whether RAW socket is used for
IPv4 and IPv6 respectively.
(3) When using DGRAM sockets to send out packets, receive sockets are
not required. Instead, IP_RECVERR is enabled to receive ICMP errors.
(4) Packet receiving function is changed from recvfrom() to recvmsg() to
retrieve more information.
(5) When error is indicated, the program will check the error type and
read from the error queue of the socket. Original payload causing the
error will be read out from the error queue to match for probe, and
additional data (e.g. source ip of ICMP error packets) will be retrieved
from CMSG.
(6) Use a separate socket to probe byter order if raw socket creation
fails, to avoid double bind issue.
(7) Also a few tweaks are added to make non-RAW socket working.
Matt Kimball [Sun, 16 Jul 2017 17:19:32 +0000 (10:19 -0700)]
commandline: Added --interface for using a named network interface
Using '--interface' on the commandline (or '-I') will specify
a network interface by name. This is sometimes a more convenient
alternative to using '--address' for specifying a source address
from which to send probes.
This can be useful when you have both a wired ethernet connection
and WiFi connection, and wish to use a specific connection for the
purposes of tracing.
This feature was requested in issue #207.
This change also cleans up main() slightly by factoring out the
hostent structure generation.
Matt Kimball [Wed, 12 Jul 2017 19:48:46 +0000 (12:48 -0700)]
json: Fix malformed json when the "hubs" list is empty
When generating JSON output, and when no hosts are found when
probing, the generated JSON was malformed. (i.e. when the "hubs" list
in the generated JSON is empty, there was no closing bracket.) This can
be reproduced by tracing to an unused host address on the local subnet.
Matt Kimball [Tue, 11 Jul 2017 21:55:40 +0000 (14:55 -0700)]
ui: display "no route to host" error as host entry rather than abort
When a host is reported as unreachable in response to a particular
network probe, the Windows version of the mtr UI had the unfortuante
behavior of exiting and and printing a terse message. This is
surprising to a user, who would expect mtr probes and reporting to
continue.
With this change, probing continues and a status reading
"no route to host" is displayed in the probe report.
This change will also improve the reporting of the Unix version of
mtr, now specifying "no route to host" instead of misleadingly
indicating that no reply has been received.
Matt Kimball [Sat, 4 Feb 2017 21:18:13 +0000 (13:18 -0800)]
cleanup: Fix #ifdef structure which confuses 'ident'
The 'indent' tool is confused by some strange #ifdef structure
around HAVE_IPINFO in report.c. Cleaned up that structure
so 'indent' can be used successfully.
projects / thirdparty / mtr.git / log
