04-06-2009
Thank you for using code tags.
First off, you're using a stream socket, not a datagram(i.e. UDP) socket. UDP sockets let you send to(and receive from) arbitrary destinations and ports at any time without making any connections, with the caveat you can only send packets up to about 1 kilobyte at a time.
Once you've made a datagram socket, you can just send to the IP address INADDR_ANY to broadcast.
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LEARN ABOUT LINUX
ng_sppp
NG_SPPP(4) BSD Kernel Interfaces Manual NG_SPPP(4)
NAME
ng_sppp -- sppp netgraph node type
SYNOPSIS
#include <netgraph/ng_sppp.h>
DESCRIPTION
An sppp node is a netgraph(4) interface to the original sppp(4) network module for synchronous lines. Currently, sppp(4) supports PPP and
Cisco HDLC protocols. An sppp node could be considered as an alternative kernel mode PPP implementation to net/mpd port + ng_ppp(4), and as
an alternative to ng_cisco(4) node. While having less features than net/mpd + ng_ppp(4), it is significantly easier to use in the majority
of simple configurations, and allows the administrator to not install the net/mpd port. With sppp you do not need any other nodes, not even
an ng_iface(4) node. When an sppp node is created, a new interface appears which is accessible via ifconfig(8). Network interfaces corre-
sponding to sppp nodes are named sppp0, sppp1, etc. When a node is shut down, the corresponding interface is removed, and the interface name
becomes available for reuse by future sppp nodes. New nodes always take the first unused interface. The node itself is assigned the same
name as its interface, unless the name already exists, in which case the node remains unnamed. The sppp node allows drivers written to the
old sppp(4) interface to be rewritten using the newer more powerful netgraph(4) interface, and still behave in a compatible manner without
supporting both network modules.
An sppp node has a single hook named downstream. Usually it is connected directly to a device driver hook.
The sppp nodes support the Berkeley Packet Filter, bpf(4).
HOOKS
This node type supports the following hooks:
downstream The connection to the synchronous line.
CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
NGM_IFACE_GET_IFNAME
Returns the name of the associated interface as a NUL-terminated ASCII string. Normally this is the same as the name of the node.
SHUTDOWN
This node shuts down upon receipt of a NGM_SHUTDOWN control message. The associated interface is removed and becomes available for use by
future sppp nodes.
Unlike most other node types and like ng_iface(4) does, an sppp node does not go away when all hooks have been disconnected; rather, an
explicit NGM_SHUTDOWN control message is required.
EXAMPLES
For example, if you have the cx(4) device, you could run PPP over it with just one command:
ngctl mkpeer cx0: sppp rawdata downstream
Now you have the sppp0 interface (if this was the first sppp node) which can be accessed via ifconfig(8) as a normal network interface, or
via spppcontrol(8) as an sppp(4) interface.
SEE ALSO
bpf(4), cx(4), netgraph(4), ng_cisco(4), ng_iface(4), ng_ppp(4), sppp(4), ifconfig(8), ngctl(8), spppcontrol(8)
For complex networking topologies you may want to look at net/mpd port.
HISTORY
The sppp node type was implemented for FreeBSD 5.0. It was included to the system since FreeBSD 5.3.
AUTHORS
Copyright (C) 2003-2004 Roman Kurakin <rik@cronyx.ru>.
BSD
February 3, 2005 BSD