This string is never modified, so constify it.

These are only used internally to initialize themselves, so mark them
static.

These functions are almost entirely the same, so re-use the existing
function rather than duplicate the body.

Wrong conditional includes intended for support of libc5 and glibc
2.0 prevented compilation under systems with alternative libcs,
such as musl. For simplicity, remove these includes necessary for
libc5 and glibc 2.0.

Currently uses sysconf(_SC_TC_CLK) to be more portable.

Make sure we use 64-bit filesystem functions everywhere.  This applies not
only to being able to read large files (which generally doesn't apply to
us), but also being able to simply stat them (as they might be using large
inodes).

No L2CAP or RFCOMM stats doesn't imply no support for Bluetooth; merely a
protocol missing.

An address type field was added, messing up our l2cap status parsing.

When an interface has transferred exbibytes
(> 0.8 EiB, i.e. > 819 PiB) of traffic,
the short display is rounded incorrectly.

For example:
bytes 2154408931384050514 (275.0 PiB)
while correct is (1913.4 PiB)

This happens because we times the rx/tx bytes values by 10,
then calculate the short version from that result:

lib/interface.c:ife_print_long()

tx = ptr->stats.tx_bytes;
short_tx = tx * 10;
if (tx > 1125899906842624ull) {
  short_tx /= 1125899906842624ull;
  Text = "PiB";
}

But multiplying anything more than 819 PiB by 10 overflows a ull
which is a uint64_t (max value of 9223372036854775807).

We'll never get accuracy over 8192 PiB (2^64) when using ull,
but we can at least correctly handle values between 819 - 8192 PiB.

The reason is that debugfs is accessible only by root user:
_PATH_SYS_BLUETOOTH_L2CAP  /sys/kernel/debug/bluetooth/l2cap
_PATH_SYS_BLUETOOTH_RFCOMM /sys/kernel/debug/bluetooth/rfcom

URL: https://www.kernel.org/doc/Documentation/filesystems/debugfs.txt
URL: https://bugzilla.redhat.com/show_bug.cgi?id=1162284

This reverts commit 343192d1.

This fix from RedHat was actually a fix for one of their custom patches.
Applying it to mainline breaks interface stats.

When using a bucket of protocols (like -A inet), do not warn/abort when
some protocols are not supported.

URL: https://bugzilla.redhat.com/1063906
URL: https://bugzilla.redhat.com/1063913

For virtual interfaces created using the ifcfg-ethN:X scripts the
ifconfig and netstat -i report statistics of the last real adapter
listed in /proc/dev/net.

URL: https://bugzilla.redhat.com/143981

The display of "netstat -o" (on|off|keepalive|unkn-X) is not accurate.
I think that "unkn-4" should be "probe0" that is working "probe0 timer
(= ICSK_TIME_PROBE0 status = TCP Window Size is Zero)" in kernel.

URL: https://bugzilla.redhat.com/466845

A bunch of these funcs are only used by interface.c, so drop them from
interface.h and mark them static.  Also mark a bunch of buffers as const
when they aren't written to.

Yay for the ABI breakage.

Signed-off-by: Catalin Patulea <cat@vv.carleton.ca>

After coverity tool scan, some warnings about signed/unsigned conflicts in
sscanf format string were found. Not a serious problem, but better to be
correct.

RHBZ#1032563

Patch from TAKADA Yoshihito
https://bugzilla.redhat.com/show_bug.cgi?id=1021109

They are needed to be able to install binaries into
/usr/bin & /usr/sbin instead of /bin & /sbin.

1) Fall-back to numeric address if getnameinfo fails.
   Reverse lookup is not mandatory, therefore its fail
   is not an error. Just return numeric address in that case.
   This makes netstat/route show IPv6 address instead of
   [UNKNOWN] in case of DNS problems.

2) Pass length of 'name' buffer into function.
   'name' is a pointer and therefore sizeof(name)
   returns size of pointer and not size of the buffer.
   see http://stackoverflow.com/questions/14298710/c-pointers-and-arrays-sizeof-operator
   The sizeof() usage was added with commit 604785ad,
   so I checked all the other changes in that commit
   and they seem to be OK.

3) remove unused 's' variable