08-01-2008
how to analyse the contents of a give IP packet?
hi you all!
I can write a network program to send and receive some messages. I use
read() and write() functions for extracting of sending messages via a given socket. By doing so, i know only the actions performed at the application layer of the TCP/IP suite. But i want to control the actual contents of each IP packets(i.e data and ip header) sent/received.Lets say I want to write a routing application which analyses the destination address found in the IP header(TCP header) and sends the packet to its destination.
Give me some hint on how to tackle such cases or give me a reference book/site...
thank you
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ip(4p) ip(4p)
Name
ip - Internet Protocol
Syntax
#include <sys/socket.h>
#include <netinet/in.h>
s = socket(AF_INET, SOCK_RAW, 0);
Description
The IP is the transport layer protocol used by the Internet protocol family. It can be accessed through a ``raw socket'' when developing
new protocols or special purpose applications. IP sockets are connectionless and are normally used with the and calls. The call, however,
can also be used to fix the destination for future packets, in which case the or and or system calls can be used.
Outgoing packets automatically have an IP header prepended to them, based on the destination address and the protocol number the socket is
created with. Incoming packets are received with their IP headers and options intact.
Diagnostics
On failure, a socket operation returns any of the following errors:
[EISCONN] Tried to establish a connection on a socket that already had one, or tried to send a datagram with the destination address
specified when the socket was already connected.
[ENOTCONN] Tried to send a datagram, but no destination address was specified and the socket was not connected.
[ENOBUFS] The system ran out of memory for an internal data structure.
[EADDRNOTAVAIL]
Made an attempt to create a socket with a network address for which no network interface existed.
See Also
send(2), recv(2), inet(4f), intro(4n), packetfilter(4)
ip(4p)