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List:       busybox
Subject:    [BusyBox] nc.c - setsockopt SO_REUSEADDR
From:       "Joseph Chiu" <josephc () idealab ! com>
Date:       2002-05-31 13:14:03
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Hi,

While trying to implement bash-httpd, I found that the busybox nc (netcat)
fails under certain conditions when re-listening to the same port:

# nc -l -p 9090
# nc -l -p 9090
nc: bind: Unknown Error: errno=125

asm/errno.h defines:
#define	EADDRINUSE	125	/* Address already in use */

Looking at the original (non-busybox) netcat, I see the author calls
setsockopt with SO_REUSEADDR.  I think the following change might be useful
in nc.c:

	if (lport != 0) {
		memset(&address.sin_addr, 0, sizeof(address.sin_addr));
		address.sin_port = htons(lport);

+		opt = 1;
+		if (setsockopt (sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof (opt)) < 0)
+		        perror_msg_and_die("setsockopt");

		if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
			perror_msg_and_die("bind");
	}


With this fix, I can now use bash-httpd -- A field-modifiable webserver in
2K bytes!  :)

Thanks.
Joseph


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