04-22-2008
regarding UDP SERVER
hi thanks for advice
but we don't have that much time to study the book and understand the subject thats why i asked to u to send the code for client also for the deadline is 24 th of this month
please send me the code if u have
and y r u using this short syn_ack = 0x11; variable while sending to the client ,
for udp concurrency one should bind an ephemeral port and re-negotiate with the client for communication on the new port->address. One should also find the interface
that the original packet arrived on and only bind this address
here should we bind in the client also or simple client can manage connection to this server code pleaswe clarify with this
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UDP(4) BSD Kernel Interfaces Manual UDP(4)
NAME
udp -- Internet User Datagram Protocol
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int
socket(AF_INET, SOCK_DGRAM, 0);
DESCRIPTION
UDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM abstraction for the Internet protocol family. UDP
sockets are connectionless, and are normally used with the sendto(2) and recvfrom(2) calls, though the connect(2) call may also be used to
fix the destination for future packets (in which case the recv(2) or read(2) and send(2) or write(2) system calls may be used).
UDP address formats are identical to those used by TCP. In particular UDP provides a port identifier in addition to the normal Internet
address format. Note that the UDP port space is separate from the TCP port space (i.e., a UDP port may not be ``connected'' to a TCP port).
In addition broadcast packets may be sent (assuming the underlying network supports this) by using a reserved ``broadcast address''; this
address is network interface dependent.
Options at the IP transport level may be used with UDP; see ip(4).
ERRORS
A socket operation may fail with one of the following errors returned:
[EISCONN] when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the desti-
nation address specified and the socket is already connected;
[ENOTCONN] when trying to send a datagram, but no destination address is specified, and the socket has not been connected;
[ENOBUFS] when the system runs out of memory for an internal data structure;
[EADDRINUSE] when an attempt is made to create a socket with a port which has already been allocated;
[EADDRNOTAVAIL] when an attempt is made to create a socket with a network address for which no network interface exists.
MIB VARIABLES
The udp protocol implements a number of variables in the net.inet branch of the sysctl(3) MIB.
UDPCTL_CHECKSUM (udp.checksum) Enable udp checksums (enabled by default).
UDPCTL_MAXDGRAM (udp.maxdgram) Maximum outgoing UDP datagram size
UDPCTL_RECVSPACE (udp.recvspace) Maximum space for incoming UDP datagrams
udp.log_in_vain For all udp datagrams, to ports on which there is no socket listening, log the connection attempt (disabled by default).
udp.blackhole When a datagram is received on a port where there is no socket listening, do not return an ICMP port unreachable message.
(Disabled by default. See blackhole(4).)
SEE ALSO
getsockopt(2), recv(2), send(2), socket(2), blackhole(4), inet(4), intro(4), ip(4)
HISTORY
The udp protocol appeared in 4.2BSD.
BSD
June 5, 1993 BSD