libsmbfs/smb/nb_name.c

	nb_name.c revision 9c9af2590af49bb395bc8d2eace0f2d4ea16d165
/*
 * 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_name.c,v 1.11 2004/12/11 05:23:59 lindak Exp $
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <libintl.h>
#include <assert.h>

#include <netsmb/netbios.h>
#include <netsmb/smb_lib.h>
#include <netsmb/nb_lib.h>
#include <netsmb/mchain.h>
#include "private.h"

int
nb_snballoc(int namelen, struct sockaddr_nb **dst)
{
    struct sockaddr_nb *snb;
    int slen;

    slen = sizeof (struct sockaddr_nb);
    snb = malloc(slen);
    if (snb == NULL)
        return (ENOMEM);
    bzero(snb, slen);
    snb->snb_family = AF_NETBIOS;
    *dst = snb;
    return (0);
}

void
nb_snbfree(struct sockaddr *snb)
{
    free(snb);
}

/*
 * Create a full NETBIOS address
 */
int
nb_sockaddr(struct sockaddr *peer, struct nb_name *np,
    struct sockaddr_nb **dst)

{
    struct sockaddr_nb *snb;
    struct sockaddr_in *sin;
    struct hostent *hst;
    int nmlen, error;

    if (peer && (peer->sa_family != AF_INET))
        return (EPROTONOSUPPORT);
#if NOT_DEFINED /* moved encoding into kernel */
    nmlen = nb_name_len(np);
    if (nmlen < NB_ENCNAMELEN)
        return (EINVAL);
#else
    nmlen = NB_NAMELEN;
#endif
    error = nb_snballoc(nmlen, &snb);
    if (error)
        return (error);

    /*
     * Moved toupper() work to callers.
     *
     * Moved NetBIOS name encoding into the driver
     * so we have readable names right up until the
     * point where we marshall them in to a message.
     * Just makes debugging easier.
     */
#if NOT_DEFINED
    if (nmlen != nb_name_encode(np, snb->snb_name))
        printf(dgettext(TEXT_DOMAIN,
            "a bug somewhere in the nb_name* code\n"));
        /* XXX */
#else
    /*
     * OK, nb_snballoc() did bzero, set snb_family.
     * Hacks for "*" moved here from nb_name_encode(),
     * but belongs where nn_name is filled in...
     * XXX fix later
     */
    if (strcmp(np->nn_name, "*") == 0) {
        /* Star is special: No blanks, type, etc. */
        snb->snb_name[0] = '*';
    } else {
        /* Normal name: pad with blanks, add type. */
        assert(NB_NAMELEN == 16);
        snprintf(snb->snb_name, NB_NAMELEN,
            "%-15.15s", np->nn_name);
        snb->snb_name[15] = (char)np->nn_type;
    }
#endif

    if (peer) {
        /*LINTED*/
        sin = (struct sockaddr_in *)peer;
        snb->snb_ipaddr = sin->sin_addr.s_addr;
    }
    *dst = snb;
    return (0);
}

int
nb_name_len(struct nb_name *np)
{
    char *name;
    int len, sclen;

    len = 1 + NB_ENCNAMELEN;
    if (np->nn_scope == NULL)
        return (len + 1);
    sclen = 0;
    for (name = np->nn_scope; *name; name++) {
        if (*name == '.') {
            sclen = 0;
        } else {
            if (sclen < NB_MAXLABLEN) {
                sclen++;
                len++;
            }
        }
    }
    return (len + 1);
}

int
nb_encname_len(const uchar_t *str)
{
    const uchar_t *cp = str;
    int len, blen;

    if ((cp[0] & 0xc0) == 0xc0)
        return (-1);    /* first two bytes are offset to name */

    len = 1;
    for (;;) {
        blen = *cp;
        if (blen++ == 0)
            break;
        len += blen;
        cp += blen;
    }
    return (len);
}

int
nb_name_encode(struct nb_name *np, uchar_t *dst)
{
    char *name;
    uchar_t *plen;
    uchar_t ch, *cp = dst;
    char *p, buf1[NB_NAMELEN+1];
    int i, lblen;

    /*
     * XXX: I'd rather see this part moved into
     * callers of this function, leaving just
     * the pure NB encoding here. -GWR
     */
    name = np->nn_name;
    if (name[0] == '*') {
        /* Star is special: No blanks, type, etc. */
        bzero(buf1, NB_NAMELEN);
        buf1[0] = '*';
    } else {
        /* Normal name: pad with blanks, add type. */
        assert(NB_NAMELEN == 16);
        snprintf(buf1, NB_NAMELEN,
            "%-15.15s", name);
        buf1[15] = (char)np->nn_type;
    }
    name = buf1;

    /*
     * Do the NetBIOS "first-level encoding" here.
     * (RFC1002 explains this wierdness...)
     * See similar code in kernel nsmb module:
     *   uts/common/fs/smbclnt/netsmb/smb_trantcp.c
     *
     * Here is what we marshall:
     *   uint8_t NAME_LENGTH (always 32)
     *   uint8_t ENCODED_NAME[32]
     *   uint8_t SCOPE_LENGTH
     *   Scope follows here, then another null.
     */

    /* NAME_LENGTH */
    *cp++ = (2 * NB_NAMELEN);

    /* ENCODED_NAME */
    for (i = 0; i < NB_NAMELEN; i++) {
        ch = name[i];
        *cp++ = 'A' + ((ch >> 4) & 0xF);
        *cp++ = 'A' + ((ch) & 0xF);
    }

    /*
     * NetBIOS "scope" sting encoding,
     * a.k.a second-level encoding.
     * See RFC1002 for the details.
     *
     * Note: plen points to the length byte at the
     * start of each string.  This keeps a pointer
     * to the location and fills it in after the
     * length of the string is determined.
     */
#if NOT_DEFINED /* XXX: not yet */
    if (np->nn_scope) {
        plen = cp++;
        *plen = 0; /* fill in later */
        lblen = 0;
        for (p = np->nn_scope; ; p++) {
            if (*p == '.' || *p == 0) {
                *plen = lblen;
                if (*p == 0)
                    break;
                plen = cp++;
                *plen = 0;
                lblen = 0;
            } else {
                if (lblen < NB_MAXLABLEN) {
                    *cp++ = *p;
                    lblen++;
                }
            }
        }
    } else
#endif /* XXX: not yet */
    {
        *cp++ = 0;
    }

    return (cp - dst);
}