To help understand scanning results a bit better and cut down on scan
output add an option to not print the contents of the IEs. Only the
SSID IE will be printed.
==24195== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==24195== at 0x4F3DBEF: sendto (in /lib64/libc-2.26.so)
==24195== by 0x13A453: can_write_data (netlink.c:119)
==24195== by 0x13866B: io_callback (io.c:149)
==24195== by 0x137365: l_main_iterate (main.c:389)
==24195== by 0x1374A3: l_main_run (main.c:436)
==24195== by 0x113524: main (main.c:832)
==24195== Address 0x5205f99 is 57 bytes inside a block of size 88 alloc'd
==24195== at 0x4C2D0AF: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24195== by 0x133931: l_malloc (util.c:62)
==24195== by 0x13AEF3: l_netlink_send (netlink.c:411)
==24195== by 0x112351: rtm_interface_send_message (main.c:276)
==24195== by 0x1126F3: iwmon_interface_lookup (main.c:405)
==24195== by 0x11351F: main (main.c:830)
==24195== Uninitialised value was created by a heap allocation
==24195== at 0x4C2D0AF: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24195== by 0x133931: l_malloc (util.c:62)
==24195== by 0x11217B: rtm_interface_send_message (main.c:234)
==24195== by 0x1126F3: iwmon_interface_lookup (main.c:405)
==24195== by 0x11351F: main (main.c:830)
==23290== Invalid read of size 4
==23290== at 0x12D334: timeout_destroy (timeout.c:61)
==23290== by 0x12CDD1: l_main_exit (main.c:466)
==23290== by 0x111F3B: main (main.c:835)
==23290== Address 0x5211d80 is 0 bytes inside a block of size 32 free'd
==23290== at 0x4C2E1BB: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x111F36: main (main.c:833)
==23290== Block was alloc'd at
==23290== at 0x4C2CF8F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x12A74D: l_malloc (util.c:62)
==23290== by 0x12D40F: timeout_create_with_nanoseconds (timeout.c:135)
==23290== by 0x112A31: signal_handler (main.c:661)
==23290== by 0x12D03A: signal_callback (signal.c:82)
==23290== by 0x12CC6D: l_main_iterate (main.c:387)
==23290== by 0x12CD3B: l_main_run (main.c:434)
==23290== by 0x1121F2: main (main.c:821)
==23290==
==23290== Invalid read of size 8
==23290== at 0x12D33B: timeout_destroy (timeout.c:64)
==23290== by 0x12CDD1: l_main_exit (main.c:466)
==23290== by 0x111F3B: main (main.c:835)
==23290== Address 0x5211d90 is 16 bytes inside a block of size 32 free'd
==23290== at 0x4C2E1BB: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x111F36: main (main.c:833)
==23290== Block was alloc'd at
==23290== at 0x4C2CF8F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x12A74D: l_malloc (util.c:62)
==23290== by 0x12D40F: timeout_create_with_nanoseconds (timeout.c:135)
==23290== by 0x112A31: signal_handler (main.c:661)
==23290== by 0x12D03A: signal_callback (signal.c:82)
==23290== by 0x12CC6D: l_main_iterate (main.c:387)
==23290== by 0x12CD3B: l_main_run (main.c:434)
==23290== by 0x1121F2: main (main.c:821)
==23290==
==23290== Invalid write of size 4
==23290== at 0x12D33F: timeout_destroy (timeout.c:62)
==23290== by 0x12CDD1: l_main_exit (main.c:466)
==23290== by 0x111F3B: main (main.c:835)
==23290== Address 0x5211d80 is 0 bytes inside a block of size 32 free'd
==23290== at 0x4C2E1BB: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x111F36: main (main.c:833)
==23290== Block was alloc'd at
==23290== at 0x4C2CF8F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==23290== by 0x12A74D: l_malloc (util.c:62)
==23290== by 0x12D40F: timeout_create_with_nanoseconds (timeout.c:135)
==23290== by 0x112A31: signal_handler (main.c:661)
==23290== by 0x12D03A: signal_callback (signal.c:82)
==23290== by 0x12CC6D: l_main_iterate (main.c:387)
==23290== by 0x12CD3B: l_main_run (main.c:434)
==23290== by 0x1121F2: main (main.c:821)
Kernel v4.10 and later no longer export GENL_ID_GENERATE (which was
defined as 0). iwd was using this symbol to check for unmodified local
values rather than to ask for a dynamically generated netlink ID anyway,
so it makes sense to use the value 0 directly. This will work with
kernels before and after the GENL_ID_GENERATE change.
Memory allocated l_timeout struct from l_timeout_create not being
freed.
==4184== HEAP SUMMARY:
==4184== in use at exit: 32 bytes in 1 blocks
==4184== total heap usage: 50 allocs, 49 frees, 39,902 bytes allocated
==4184==
==4184== 32 bytes in 1 blocks are definitely lost in loss record 1 of 1
==4184== at 0x4C2ABA0: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4184== by 0x40706D: l_malloc (util.c:62)
==4184== by 0x408D9A: l_timeout_create (timeout.c:117)
==4184== by 0x40896A: signal_callback (signal.c:82)
==4184== by 0x408692: l_main_run (main.c:346)
==4184== by 0x402474: main (main.c:797)
==4184==
==4184== LEAK SUMMARY:
==4184== definitely lost: 32 bytes in 1 blocks
==4184== indirectly lost: 0 bytes in 0 blocks
==4184== possibly lost: 0 bytes in 0 blocks
==4184== still reachable: 0 bytes in 0 blocks
==4184== suppressed: 0 bytes in 0 blocks
Send a RTM_DELLINK for the interface in use if it was created by iwmon.
As the main loop needs to be running when sending RTM_DELLINK, add a
timeout function for quitting the main loop.
On startup, request a list of interfaces via netlink. Find out whether
an interface of type nlmon exists and use it if it has all the needed
flags set. The default name of the interface is 'nlmon', which can be
changed from the command line. If the interface name is in use and is
not an nlmon type, print out an error message and exit.
