dist/smbfs/lib/smb/nb_name.c

   1 /*
   2  * Copyright (c) 2000-2001, Boris Popov
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *    This product includes software developed by Boris Popov.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * from: Id: nb_name.c,v 1.2 2001/08/22 03:31:36 bp Exp
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __RCSID("$NetBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <sys/endian.h>
  41
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <netsmb/netbios.h>
  50 #include <netsmb/smb_lib.h>
  51 #include <netsmb/nb_lib.h>
  52
  53 int
  54 nb_snballoc(int namelen, struct sockaddr_nb **dst)
  55 {
  56         struct sockaddr_nb *snb;
  57         int slen;
  58
  59         slen = namelen + sizeof(*snb) - sizeof(snb->snb_name);
  60         snb = malloc(slen);
  61         if (snb == NULL)
  62                 return ENOMEM;
  63         bzero(snb, slen);
  64         snb->snb_family = AF_NETBIOS;
  65         snb->snb_len = slen;
  66         *dst = snb;
  67         return 0;
  68 }
  69
  70 void
  71 nb_snbfree(struct sockaddr *snb)
  72 {
  73         free(snb);
  74 }
  75
  76 /*
  77  * Create a full NETBIOS address
  78  */
  79 int
  80 nb_sockaddr(struct sockaddr *peer, struct nb_name *np,
  81         struct sockaddr_nb **dst)
  82
  83 {
  84         struct sockaddr_nb *snb;
  85         int nmlen, error;
  86
  87         if (peer && (peer->sa_family != AF_INET && peer->sa_family != AF_IPX))
  88                 return EPROTONOSUPPORT;
  89         nmlen = nb_name_len(np);
  90         if (nmlen < NB_ENCNAMELEN)
  91                 return EINVAL;
  92         error = nb_snballoc(nmlen, &snb);
  93         if (error)
  94                 return error;
  95         if (nmlen != nb_name_encode(np, snb->snb_name))
  96                 printf("a bug somewhere in the nb_name* code\n");
  97         if (peer)
  98                 memcpy(&snb->snb_tran, peer, peer->sa_len);
  99         *dst = snb;
 100         return 0;
 101 }
 102
 103 int
 104 nb_name_len(struct nb_name *np)
 105 {
 106         u_char *name;
 107         int len, sclen;
 108
 109         len = 1 + NB_ENCNAMELEN;
 110         if (np->nn_scope == NULL)
 111                 return len + 1;
 112         sclen = 0;
 113         for (name = np->nn_scope; *name; name++) {
 114                 if (*name == '.') {
 115                         sclen = 0;
 116                 } else {
 117                         if (sclen < NB_MAXLABLEN) {
 118                                 sclen++;
 119                                 len++;
 120                         }
 121                 }
 122         }
 123         return len + 1;
 124 }
 125
 126 int
 127 nb_encname_len(const char *str)
 128 {
 129         const u_char *cp = (const u_char *)str;
 130         int len, blen;
 131
 132         if ((cp[0] & 0xc0) == 0xc0)
 133                 return -1;      /* first two bytes are offset to name */
 134
 135         len = 1;
 136         for (;;) {
 137                 blen = *cp;
 138                 if (blen++ == 0)
 139                         break;
 140                 len += blen;
 141                 cp += blen;
 142         }
 143         return len;
 144 }
 145
 146 #define NBENCODE(c)     (htole16((u_short)(((u_char)(c) >> 4) | \
 147                          (((u_char)(c) & 0xf) << 8)) + 0x4141))
 148
 149 static void
 150 memsetw(char *dst, int n, u_short word)
 151 {
 152         for(; n > 0; n--, dst += 2)
 153                 memcpy(dst, &word, 2);
 154 }
 155
 156 int
 157 nb_name_encode(struct nb_name *np, u_char *dst)
 158 {
 159         u_char *name, *plen;
 160         u_char *cp = dst;
 161         int i, lblen;
 162         u_int16_t ch;
 163
 164         *cp++ = NB_ENCNAMELEN;
 165         name = np->nn_name;
 166         if (name[0] == '*' && name[1] == 0) {
 167                 ch = NBENCODE('*');
 168                 memcpy(cp, &ch, 2);
 169                 memsetw(cp + 2, NB_NAMELEN - 1, NBENCODE(' '));
 170                 cp += NB_ENCNAMELEN;
 171         } else {
 172                 for (i = 0; *name && i < NB_NAMELEN; i++, cp += 2, name++) {
 173                         ch = NBENCODE(toupper(*name));
 174                         memcpy(cp, &ch, 2);
 175                 }
 176                 i = NB_NAMELEN - i - 1;
 177                 if (i > 0) {
 178                         memsetw(cp, i, NBENCODE(' '));
 179                         cp += i * 2;
 180                 }
 181                 ch = NBENCODE(np->nn_type);
 182                 memcpy(cp, &ch, 2);
 183                 cp += 2;
 184         }
 185         *cp = 0;
 186         if (np->nn_scope == NULL)
 187                 return nb_encname_len(dst);
 188         plen = cp++;
 189         lblen = 0;
 190         for (name = np->nn_scope; ; name++) {
 191                 if (*name == '.' || *name == 0) {
 192                         *plen = lblen;
 193                         plen = cp++;
 194                         *plen = 0;
 195                         if (*name == 0)
 196                                 break;
 197                 } else {
 198                         if (lblen < NB_MAXLABLEN) {
 199                                 *cp++ = *name;
 200                                 lblen++;
 201                         }
 202                 }
 203         }
 204         return nb_encname_len(dst);
 205 }
 206