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\page testing_tools Testing and development tools
[ \ref eapol_test "eapol_test" |
\ref preauth_test "preauth_test" |
\ref unit_tests "Unit tests" |
\ref wpa_trace "Tracing code" ]
wpa_supplicant source tree includes number of testing and development
tools that make it easier to test the programs without having to setup
a full test setup with wireless cards. In addition, these tools can be
used to implement automatic tests suites.
\section eapol_test eapol_test - EAP peer and RADIUS client testing
eapol_test is a program that links together the same EAP peer
implementation that wpa_supplicant is using and the RADIUS
authentication client code from hostapd. In addition, it has minimal
glue code to combine these two components in similar ways to IEEE
802.1X/EAPOL Authenticator state machines. In other words, it
integrates IEEE 802.1X Authenticator (normally, an access point) and
IEEE 802.1X Supplicant (normally, a wireless client) together to
generate a single program that can be used to test EAP methods without
having to setup an access point and a wireless client.
The main uses for eapol_test are in interoperability testing of EAP
methods against RADIUS servers and in development testing for new EAP
methods. It can be easily used to automate EAP testing for
interoperability and regression since the program can be run from
shell scripts without require additional test components apart from a
RADIUS server. For example, the automated EAP tests described in
eap_testing.txt are implemented with eapol_test. Similarly, eapol_test
could be used to implement an automated regression test suite for a
RADIUS authentication server.
eapol_test uses the same build time configuration file, .config, as
wpa_supplicant. This file is used to select which EAP methods are
included in eapol_test. This program is not built with the default
Makefile target, so a separate make command needs to be used to
compile the tool:
make eapol_test
The resulting eapol_test binary has following command like options:
eapol_test [-nWS] -c<conf> [-a<AS IP>] [-p<AS port>] [-s<AS secret>] \
[-r<count>] [-t<timeout>] [-C<Connect-Info>] \
[-M<client MAC address>]
eapol_test scard
eapol_test sim <PIN> <num triplets> [debug]
-c<conf> = configuration file
-a<AS IP> = IP address of the authentication server, default
-p<AS port> = UDP port of the authentication server, default 1812
-s<AS secret> = shared secret with the authentication server, default 'radius'
-r<count> = number of re-authentications
-W = wait for a control interface monitor before starting
-S = save configuration after authentiation
-n = no MPPE keys expected
-t<timeout> = sets timeout in seconds (default: 30 s)
-C<Connect-Info> = RADIUS Connect-Info (default: CONNECT 11Mbps 802.11b)
-M<client MAC address> = Set own MAC address (Calling-Station-Id,
default: 02:00:00:00:00:01)
As an example,
eapol_test -ctest.conf -a127.0.0.1 -p1812 -ssecret -r1
tries to complete EAP authentication based on the network
configuration from test.conf against the RADIUS server running on the
local host. A re-authentication is triggered to test fast
re-authentication. The configuration file uses the same format for
network blocks as wpa_supplicant.
\section preauth_test preauth_test - WPA2 pre-authentication and EAP peer testing
preauth_test is similar to eapol_test in the sense that in combines
EAP peer implementation with something else, in this case, with WPA2
pre-authentication. This tool can be used to test pre-authentication
based on the code that wpa_supplicant is using. As such, it tests
both the wpa_supplicant implementation and the functionality of an
access point.
preauth_test is built with:
make preauth_test
and it uses following command line arguments:
usage: preauth_test <conf> <target MAC address> <ifname>
For example,
preauth_test test.conf 02:11:22:33:44:55 eth0
would use network configuration from test.conf to try to complete
pre-authentication with AP using BSSID 02:11:22:33:44:55. The
pre-authentication packets would be sent using the eth0 interface.
\section unit_tests Unit tests
Number of the components (.c files) used in wpa_supplicant define
their own unit tests for automated validation of the basic
functionality. Most of the tests for cryptographic algorithms are
using standard test vectors to validate functionality. These tests can
be useful especially when verifying port to a new CPU target.
The test programs are collected in the tests subdirectory. All
automated unit tests can be run with
make run-tests
This make target builds and runs each test and terminates with zero
exit code if all tests were completed successfully.
\section wpa_trace Tracing code for developer debuggin
wpa_supplicant and hostapd can be built with tracing code that will
track and analyze memory allocations and other resource registrations
and certain API uses. If incorrect use is detected, a backtrace of the
call location (and/or allocation location) is shown. This can also be
used to detect certain categories of memory leaks and report them
automatically when the program is terminated. The report will also
include information about forgotten eloop events.
The trace code can be enabled with CONFIG_WPA_TRACE=y build
option. More verbose backtrace information can be generated if libbfd
is available and the binaries are not stripped of symbol
information. This is enabled with CONFIG_WPA_TRACE_BFD=y.
For example, a memory leak (forgotten os_free() call) would show up
like this when the program is terminated:
MEMLEAK[0x82d200]: len 128
WPA_TRACE: memleak - START
[0]: ./wpa_supplicant(os_malloc+0x59) [0x41a5e9]
os_malloc() ../src/utils/os_unix.c:359
[1]: ./wpa_supplicant(os_zalloc+0x16) [0x41a676]
os_zalloc() ../src/utils/os_unix.c:418
[2]: ./wpa_supplicant(wpa_supplicant_init+0x38) [0x48b508]
wpa_supplicant_init() wpa_supplicant.c:2315
[3]: ./wpa_supplicant(main+0x2f3) [0x491073]
main() main.c:252
WPA_TRACE: memleak - END
MEMLEAK: total 128 bytes
Another type of error that can be detected is freeing of memory area
that was registered for some use and is still be referenced:
WPA_TRACE: Freeing referenced memory - START
[2]: ./wpa_supplicant(os_free+0x5c) [0x41a53c]
os_free() ../src/utils/os_unix.c:411
[3]: ./wpa_supplicant(wpa_supplicant_remove_iface+0x30) [0x48b380]
wpa_supplicant_remove_iface() wpa_supplicant.c:2259
[4]: ./wpa_supplicant(wpa_supplicant_deinit+0x20) [0x48b3e0]
wpa_supplicant_deinit() wpa_supplicant.c:2430
[5]: ./wpa_supplicant(main+0x357) [0x4910d7]
main() main.c:276
WPA_TRACE: Freeing referenced memory - END
WPA_TRACE: Reference registration - START
[1]: ./wpa_supplicant [0x41c040]
eloop_trace_sock_add_ref() ../src/utils/eloop.c:94
[2]: ./wpa_supplicant(wpa_supplicant_ctrl_iface_deinit+0x17) [0x473247]
wpa_supplicant_ctrl_iface_deinit() ctrl_iface_unix.c:436
[3]: ./wpa_supplicant [0x48b21c]
wpa_supplicant_cleanup() wpa_supplicant.c:378
wpa_supplicant_deinit_iface() wpa_supplicant.c:2155
[4]: ./wpa_supplicant(wpa_supplicant_remove_iface+0x30) [0x48b380]
wpa_supplicant_remove_iface() wpa_supplicant.c:2259
[5]: ./wpa_supplicant(wpa_supplicant_deinit+0x20) [0x48b3e0]
wpa_supplicant_deinit() wpa_supplicant.c:2430
[6]: ./wpa_supplicant(main+0x357) [0x4910d7]
main() main.c:276
WPA_TRACE: Reference registration - END
This type of error results in showing backtraces for both the location
where the incorrect freeing happened and the location where the memory
area was marked referenced.