Whitespace cleanups

mount_cd9660(8): Simplify and clean up set_charset()

Simplify set_charset(), partly according to mount_ntfs(8).

Meanwhile, clean up the whitespace styles.

cd9660: Add support for mask,dirmask,uid,gid options

The updates to mount_cd9660(8) are basically taken from mount_msdos(8).

GitHub PR: https://github.com/DragonFlyBSD/DragonFlyBSD/pull/23
See also

cd9660: Add support for mask,dirmask,uid,gid options

The updates to mount_cd9660(8) are basically taken from mount_msdos(8).

GitHub PR: https://github.com/DragonFlyBSD/DragonFlyBSD/pull/23
See also:
- https://github.com/freebsd/freebsd-src/pull/982
- https://github.com/NetBSD/src/pull/29

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umount(8): Add -d option to detach vn(4) devices

The '-d' option tells umount(8) to detach the underlying vn(4) device if
the filesystem was mounted from it. Note that vn(4) is a virtual disk
and c

umount(8): Add -d option to detach vn(4) devices

The '-d' option tells umount(8) to detach the underlying vn(4) device if
the filesystem was mounted from it. Note that vn(4) is a virtual disk
and can provides multiple filesystems, so the vn(4) detaching can only
succeed when all the filesystems are umounted.

For example:
$ vnconfig -c vn dfly.img
vn4
$ mount_msdos /dev/vn4s1 /mnt/dfly/boot
$ mount_ufs /dev/vn4s2a /mnt/dfly/root
$ umount -d /mnt/dfly/boot
umount: VNIOCDETACH: /dev/vn4: Device busy
umount: detach of /dev/vn4s1 failed
$ umount -d /mnt/dfly/root
(now vn4 is detached)

A similar option exists in Linux's and FreeBSD's umount(8).

GitHub PR: https://github.com/DragonFlyBSD/DragonFlyBSD/pull/24
See Also: https://github.com/freebsd/freebsd-src/pull/972

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md5(1): Further cleanup the code a bit

No functional changes.

md5(1): Improve the previous commit

Improve digestbig() to further check for read() errors and return NULL
in that case.

Add a comment to explain why can't use file size (st_size).

md5(1): Fix to calculate correct checksum on pseudo filesystems

The file size (st_size) on pseudo filesystems can be zero and
meaningless, so ignore it and read until EOF to get the whole contents.

md5(1): Fix to calculate correct checksum on pseudo filesystems

The file size (st_size) on pseudo filesystems can be zero and
meaningless, so ignore it and read until EOF to get the whole contents.
Now md5(1) is able to calculate the correct checksums for files on
pseudo filesystems, like /proc.

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md5(1): Minor code tweaks and style cleanups

No functional changes.

ping(8): Add check for negative wait timeout

Meanwhile, fix the error message.

ping(8): Relax the interval restriction for normal users

The ping interval was restricted to be >= 1 second for normal users to
prevent from performing DoS attacks. This restriction was added by
Ma

ping(8): Relax the interval restriction for normal users

The ping interval was restricted to be >= 1 second for normal users to
prevent from performing DoS attacks. This restriction was added by
Matt Dillon in 1998 during the BEST days [0]. It has become less
meaningful now. Following the Linux behavior, relax the interval to be
>= 2 milliseconds for normal users.

In addition, add a check for negative interval numbers.

[0] https://github.com/freebsd/freebsd-src/commit/526f06b278d9252add168aa18b60242c08771165

Discussed-with: dillon

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ping(8): Allow normal users to specify larger packets

Before this change, only super-user could specify a packet size larger
than the default 56 bytes. This restriction was added by Matt Dillon in

ping(8): Allow normal users to specify larger packets

Before this change, only super-user could specify a packet size larger
than the default 56 bytes. This restriction was added by Matt Dillon in
1998 during the BEST days [0].

Nowadays, it doesn't make much sense to limit the packet size. In
addition, this restriction doesn't exist in ping6(8) and on NetBSD,
OpenBSD and Linux.

And one more interesting thing, UMS [1] uses this feature to estimate
the client's bandwidth to optimize the streaming experience.

[0] https://github.com/freebsd/freebsd-src/commit/526f06b278d9252add168aa18b60242c08771165
[1] UMS: https://github.com/UniversalMediaServer/UniversalMediaServer

Discussed-with: dillon

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ifconfig(8): Minor cleanups to ifwg.c

Meanwhile, fix a minor typo in the error message of '-wgpka' command.

ifconfig(8): Minor code and style cleanups

No functional changes.

ifconfig(8): Change some 'int' variables to 'bool' whenever possible

I'd like to change 'doalias' as well, but it seems to require 3 states,
so leave it alone this moment.

ifconfig(8): Fix bug in interface address configuration

When the interface name had a length of >= 8, the address configuration
would fail with the ENXIO error, i.e., "no such interface".

This bug

ifconfig(8): Fix bug in interface address configuration

When the interface name had a length of >= 8, the address configuration
would fail with the ENXIO error, i.e., "no such interface".

This bug was made by me in commit c29ec76. It was caused by the
interface was truncated because the destination buffer size was wrongly
determined, as I was using sizeof() on a 'void *' pointer instead of the
actual interface name buffer.

Fix it by directly using IFNAMSIZ instead of sizeof().

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wg: Export the internal peer ID to userland for diagnostics

The auto-generated internal peer ID is used in various debug messages,
so exporting it to the userland (i.e., ifconfig(8)) can help with t

wg: Export the internal peer ID to userland for diagnostics

The auto-generated internal peer ID is used in various debug messages,
so exporting it to the userland (i.e., ifconfig(8)) can help with the
diagnostics.

Update ifconfig(8) to print the added peer ID.

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ifconfig.8: Add description for wg(4)

Note that the 'wgcookie' and '-wgcookie' parameters are commented out
for the moment, because they're ineffective yet.

ifconfig(8): Show wg(4) private key and PSK if '-k' specified

ifconfig(8): Add WireGuard wg(4) support

Obtained from OpenBSD with significant modifications.

route.8: Some markup improvements

Various minor whitespace cleanups

Accumulated along the way.

Fix typos: uknown -> unknown

ifconfig.8: More markup tweaks

The main change is replacing 'Sy' with 'Cm', since those symbols are
intended to be given on the command line as arguments.

ifconfig.8: Alphabetically sort the general parameters

ifconfig.8: Remove the legacy and commented eon(5) and OSI stuffs

The eon(5) seems to be related to RFC 986, "which appears to be a rough
ISO equivalent of the IPv6 6to4 transition mechanism." [0]

ifconfig.8: Remove the legacy and commented eon(5) and OSI stuffs

The eon(5) seems to be related to RFC 986, "which appears to be a rough
ISO equivalent of the IPv6 6to4 transition mechanism." [0]

The "nsellength" thing seems to be related to OSI networking.

These commented contents has been there since 1996 in FreeBSD codebase.
I don't see a point to still keep them, so just remove these legacy
stuffs.

[0] https://gnats.netbsd.org/10500

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