Add the use of M_ZERO to netgraph.

Submitted by: josh@zipperup.org
Submitted by: Robert Drehmel <robd@gmx.net>
Submitted by: archie
Approved by: archie

Go back to using data_len in struct ngpppoe_init_data after discussions
with Julian and Archie.

Implement a new ``sizedstring'' parse type for dealing with field pairs
consisting of a uint16_t follo

Go back to using data_len in struct ngpppoe_init_data after discussions
with Julian and Archie.

Implement a new ``sizedstring'' parse type for dealing with field pairs
consisting of a uint16_t followed by a data field of that size, and use
this to deal with the data_len and data fields.

Written by: Archie with some input by me
Agreed in principle by: julian

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Since neither archie nor I work at Whistle any more, change our email
addresses to be the more usefu @freebsd.org ones
so we can keep getting bug-reports.
- man pages to follow..

Avoid free'ing a NULL pointer.

- Add new unsigned and hex integer parse types; this allows simplifying
the bytearray parse type.
- Allocate (larger) temporary work buffer dynamically instead of on the
stack when comparing to t

- Add new unsigned and hex integer parse types; this allows simplifying
the bytearray parse type.
- Allocate (larger) temporary work buffer dynamically instead of on the
stack when comparing to the default value.

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Fix typo: "ng_parse_fixedsstring_info" -> "ng_parse_fixedstring_info"

Remove a bunch of un-needed includes.
Submitted by: phk@freebsd.org

Fix bug parsing 32 bit integers on machines where sizeof(long) == 4.

Add two new generic control messages, NGM_ASCII2BINARY and
NGM_BINARY2ASCII, which convert control messages to ASCII and back.
This allows control messages to be sent and received in ASCII form
using

Add two new generic control messages, NGM_ASCII2BINARY and
NGM_BINARY2ASCII, which convert control messages to ASCII and back.
This allows control messages to be sent and received in ASCII form
using ngctl(8), which makes ngctl a lot more useful.

This also allows all the type-specific debugging code in libnetgraph
to go away -- instead, we just ask the node itself to do the ASCII
translation for us.

Currently, all generic control messages are supported, as well as
messages associated with the following node types: async, cisco,
ksocket, and ppp.

See /usr/share/examples/netgraph/ngctl for an example of using this.

Also give ngctl(8) the ability to print out incoming data and
control messages at any time. Eventually nghook(8) may be subsumed.

Several other misc. bug fixes.

Reviewed by: julian

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