Re: UDP Broadcast

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Article #4095

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#4095

From: Bob Gonder
Date: Mon, 04 Apr 2005 16:31

24 lines
1880 bytes

Adam Griffin wrote:

>I need to broadcast a udp packet across my lan.  I get an invalid ip address 
>error when trying to with INADDR_ANY.  I can successfully call sendto if I 

INADDR_ANY, as the name implies, is for INput, or receiving a
broadcast. The Output address is

#define	UDP_GROUP	"255.255.255.255"
#define	UDP_PORT	12345 /*whatever you want to use*/

	SendSocket=socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP )) )
	/* turn on broadcast */
	t = TRUE;

setsockopt(SendSocket,SOL_SOCKET,SO_BROADCAST,(char*)&t,sizeof(t));
	/* set up destination address */
	memset( &SendAddr, 0, sizeof(SendAddr) );
	SendAddr.sin_family = AF_INET;
	SendAddr.sin_addr.s_addr = inet_addr( UDP_GROUP );
	SendAddr.sin_port = htons( UDP_PORT );
	/* now just sendto() our destination! */
	sendto( SendSocket, DataGram, sizeof(DataGram), 0,
		(struct sockaddr *) &SendAddr, sizeof(SendAddr) );

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.internet.socket
Subject: Re: UDP Broadcast
Date: Mon, 04 Apr 2005 09:31:59 -0700
Organization: MindSpring Enterprises, Inc.
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