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C function for sending ASCII text as UDP packet
Posted on 2009-04-10
I'm trying to write a C function that accepts an ASCII string as it's input parameter and broadcasts that text over the network as a UDP packet.
I have no idea where to start with this.
Here's a brief example of what i mean...
I have no idea where to start with this.
Here's a brief example of what i mean...
int main( int argc, const char* argv[] )
{
SendTextViaUdpBroadcast("EXAMPLE_TEXT_TO_BE_SENT");
}
void SendTextViaUdpBroadcast ( TextIn )
{
// Here the contents of TextIn are send as ascii in a udp packet as a broadcast (to ip 255.255.255.255)
}
[X]
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5 Comments
You want to set the EnableBroadcast property on the UdpClient instance
set to true. Once you do that, you want to send your request to the IP
address of 255.255.255.255. From the documentation for the EnableBroadcast
property on the UdpClient class:
Broadcasting is limited to a specific subnet. You can broadcast to your
local subnet by sending a packet to 255.255.255.255; or, you can use the
directed broadcast address, which is the network portion of an Internet
Protocol (IP) address with all bits set in the host portion. For example, if
your IP address is 192.168.1.40 (a Class C address, with the network portion
as the first three octets, and the host portion is the last octet), your
directed broadcast address is 192.168.1.255.
set to true. Once you do that, you want to send your request to the IP
address of 255.255.255.255. From the documentation for the EnableBroadcast
property on the UdpClient class:
Broadcasting is limited to a specific subnet. You can broadcast to your
local subnet by sending a packet to 255.255.255.255; or, you can use the
directed broadcast address, which is the network portion of an Internet
Protocol (IP) address with all bits set in the host portion. For example, if
your IP address is 192.168.1.40 (a Class C address, with the network portion
as the first three octets, and the host portion is the last octet), your
directed broadcast address is 192.168.1.255.
This manual will be a great help for you!!
http://www.dmp.com.tw/tech/os-dos/DSock_Programmer_Manual.pdf
http://www.dmp.com.tw/tech/os-dos/DSock_Programmer_Manual.pdf
Maybe i should clarify... This is C on linux (debian/ubuntu).
How do i open the socket in the first place?
How do i send the packet?
How do i close the socket afterwards?
How do i open the socket in the first place?
How do i send the packet?
How do i close the socket afterwards?
basically
fd = socket() // create a socket
sendto( fd, ...) // send datagram to listening socket
recvfrom( fd, ...) // get response from server
close( fd) // close the socket
An excellent text for the fine details is Stevens, Unix Network Programming
A quick overview can be had with
http://pages.cpsc.ucalgary.ca/~agopinat/441/files/UDPSocketProgramming.ppt
fd = socket() // create a socket
sendto( fd, ...) // send datagram to listening socket
recvfrom( fd, ...) // get response from server
close( fd) // close the socket
An excellent text for the fine details is Stevens, Unix Network Programming
A quick overview can be had with
http://pages.cpsc.ucalgary.ca/~agopinat/441/files/UDPSocketProgramming.ppt
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