xref: /freebsd-10.2-release/contrib/smbfs/lib/smb/nb_net.c

/*
 * Copyright (c) 2000, Boris Popov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: nb_net.c,v 1.4 2001/02/16 02:46:12 bp Exp $
 * $FreeBSD: head/contrib/smbfs/lib/smb/nb_net.c 125130 2004-01-28 05:55:13Z tjr $
 */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

#include <net/if.h>

#include <ctype.h>
#include <netdb.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

#include <netsmb/netbios.h>
#include <netsmb/smb_lib.h>
#include <netsmb/nb_lib.h>

int
nb_getlocalname(char *name)
{
	char buf[1024], *cp;

	if (gethostname(buf, sizeof(buf)) != 0)
		return errno;
	cp = strchr(buf, '.');
	if (cp)
		*cp = 0;
	strcpy(name, buf);
	return 0;
}

int
nb_resolvehost_in(const char *name, struct sockaddr **dest)
{
	struct hostent* h;
	struct sockaddr_in *sinp;
	int len;

	h = gethostbyname(name);
	if (!h) {
		warnx("can't get server address `%s': ", name);
		herror(NULL);
		return ENETDOWN;
	}
	if (h->h_addrtype != AF_INET) {
		warnx("address for `%s' is not in the AF_INET family", name);
		return EAFNOSUPPORT;
	}
	if (h->h_length != 4) {
		warnx("address for `%s' has invalid length", name);
		return EAFNOSUPPORT;
	}
	len = sizeof(struct sockaddr_in);
	sinp = malloc(len);
	if (sinp == NULL)
		return ENOMEM;
	bzero(sinp, len);
	sinp->sin_len = len;
	sinp->sin_family = h->h_addrtype;
	memcpy(&sinp->sin_addr.s_addr, h->h_addr, 4);
	sinp->sin_port = htons(SMB_TCP_PORT);
	*dest = (struct sockaddr*)sinp;
	return 0;
}

int
nb_enum_if(struct nb_ifdesc **iflist, int maxif)
{
	struct ifconf ifc;
	struct ifreq *ifrqp;
	struct nb_ifdesc *ifd;
	struct in_addr iaddr, imask;
	char *ifrdata, *iname;
	int s, rdlen, ifcnt, error, iflags, i;
	size_t ifrlen;

	*iflist = NULL;
	s = socket(AF_INET, SOCK_DGRAM, 0);
	if (s == -1)
		return errno;

	rdlen = maxif * sizeof(struct ifreq);
	ifrdata = malloc(rdlen);
	if (ifrdata == NULL) {
		error = ENOMEM;
		goto bad;
	}
	ifc.ifc_len = rdlen;
	ifc.ifc_buf = ifrdata;
	if (ioctl(s, SIOCGIFCONF, &ifc) != 0) {
		error = errno;
		goto bad;
	}
	ifrqp = ifc.ifc_req;
	ifcnt = ifc.ifc_len / sizeof(struct ifreq);
	error = 0;
	for (i = 0; i < ifcnt; i++) {
		ifrlen = sizeof(struct ifreq);
		if (ifrqp->ifr_addr.sa_len > sizeof(struct sockaddr))
			ifrlen += ifrqp->ifr_addr.sa_len
				- sizeof(struct sockaddr);

		if (ifrqp->ifr_addr.sa_family != AF_INET)
			goto next;
		iname = ifrqp->ifr_name;
		if (strlen(iname) >= sizeof(ifd->id_name))
			goto next;

		iaddr = (*(struct sockaddr_in *)&ifrqp->ifr_addr).sin_addr;

		if (ioctl(s, SIOCGIFNETMASK, ifrqp) != 0)
			goto next;
		imask = ((struct sockaddr_in *)&ifrqp->ifr_addr)->sin_addr;

		if (ioctl(s, SIOCGIFFLAGS, ifrqp) != 0)
			goto next;
		iflags = ifrqp->ifr_flags;
		if ((iflags & IFF_UP) == 0 || (iflags & IFF_BROADCAST) == 0)
			goto next;

		ifd = malloc(sizeof(struct nb_ifdesc));
		if (ifd == NULL)
			return ENOMEM;
		bzero(ifd, sizeof(struct nb_ifdesc));
		strcpy(ifd->id_name, iname);
		ifd->id_flags = iflags;
		ifd->id_addr = iaddr;
		ifd->id_mask = imask;
		ifd->id_next = *iflist;
		*iflist = ifd;

next:
		ifrqp = (struct ifreq *)((caddr_t)ifrqp + ifrlen);
	}
bad:
	free(ifrdata);
	close(s);
	return error;
}

/*ARGSUSED*/
/*int
nbns_resolvename(const char *name, struct sockaddr **dest)
{
	printf("NetBIOS name resolver is not included in this distribution.\n");
	printf("Please use '-I' option to specify an IP address of server.\n");
	return EHOSTUNREACH;
}*/
/*
int
nb_hostlookup(struct nb_name *np, const char *server, const char *hint,
	struct sockaddr_nb **dst)
{
	struct sockaddr_nb *snb;
	int error;

	error = nb_sockaddr(NULL, np, &snb);
	if (error)
		return error;
	do {
		if (hint) {
			error = nb_resolvehost_in(host, snb);
			if (error)
				break;
		} else {
			error = nb_resolvename(server);
		}
	} while(0);
	if (!error) {
		*dst = snb;
	} else
		nb_snbfree(snb);
	return error;
}
*/