libpurple/protocols/zephyr/ZOpenPort.c

/* This file is part of the Project Athena Zephyr Notification System.
 * It contains source for the ZOpenPort function.
 *
 *	Created by:	Robert French
 *
 *	Copyright (c) 1987 by the Massachusetts Institute of Technology.
 *	For copying and distribution information, see the file
 *	"mit-copyright.h".
 */

#include "internal.h"
#include "debug.h"
#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif

Code_t
ZOpenPort(unsigned short *port)
{
    struct sockaddr_in bindin;
    socklen_t len;

    (void) ZClosePort();
    memset(&bindin, 0, sizeof(bindin));

    if ((__Zephyr_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
	__Zephyr_fd = -1;
	return (errno);
    }

#ifdef SO_BSDCOMPAT
	{
		int on = 1;

		if (setsockopt(__Zephyr_fd, SOL_SOCKET, SO_BSDCOMPAT,
			(char *)&on, sizeof(on)) != 0)
		{
			purple_debug_warning("zephyr", "couldn't setsockopt\n");
		}
	}
#endif

    bindin.sin_family = AF_INET;

    if (port && *port)
	bindin.sin_port = *port;
    else
	bindin.sin_port = 0;

    bindin.sin_addr.s_addr = INADDR_ANY;

    if (bind(__Zephyr_fd, (struct sockaddr *)&bindin, sizeof(bindin)) < 0) {
	if (errno == EADDRINUSE && port && *port)
	    return (ZERR_PORTINUSE);
	else
	    return (errno);
    }

    if (!bindin.sin_port) {
	len = sizeof(bindin);
	if (getsockname(__Zephyr_fd, (struct sockaddr *)&bindin, &len))
	    return (errno);
    }

    __Zephyr_port = bindin.sin_port;
    __Zephyr_open = 1;

    if (port)
	*port = bindin.sin_port;

    return (ZERR_NONE);
}