xref: /illumos-gate/usr/src/lib/libsmbfs/smb/nb_name.c (revision 02d09e03)
1 /*
2  * Copyright (c) 2000, 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  * $Id: nb_name.c,v 1.11 2004/12/11 05:23:59 lindak Exp $
33  */
34 
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <ctype.h>
38 #include <errno.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <strings.h>
43 #include <libintl.h>
44 #include <assert.h>
45 
46 #include <netsmb/netbios.h>
47 #include <netsmb/smb_lib.h>
48 #include <netsmb/nb_lib.h>
49 #include <netsmb/mchain.h>
50 #include "private.h"
51 
52 int
nb_snballoc(struct sockaddr_nb ** dst)53 nb_snballoc(struct sockaddr_nb **dst)
54 {
55 	struct sockaddr_nb *snb;
56 	int slen;
57 
58 	slen = sizeof (struct sockaddr_nb);
59 	snb = malloc(slen);
60 	if (snb == NULL)
61 		return (ENOMEM);
62 	bzero(snb, slen);
63 	snb->snb_family = AF_NETBIOS;
64 	*dst = snb;
65 	return (0);
66 }
67 
68 void
nb_snbfree(struct sockaddr * snb)69 nb_snbfree(struct sockaddr *snb)
70 {
71 	free(snb);
72 }
73 
74 /*
75  * Create a full NETBIOS address
76  * Passed names should already be upper case.
77  * Stores the names truncated or blank padded.
78  * NetBIOS name encoding happens later.
79  */
80 int
nb_sockaddr(struct sockaddr * peer,struct nb_name * np,struct sockaddr_nb ** dst)81 nb_sockaddr(struct sockaddr *peer, struct nb_name *np,
82 	struct sockaddr_nb **dst)
83 
84 {
85 	struct sockaddr_nb *snb;
86 	struct sockaddr_in *sin;
87 	int error;
88 
89 	if (peer && (peer->sa_family != AF_INET))
90 		return (EPROTONOSUPPORT);
91 	error = nb_snballoc(&snb);
92 	if (error)
93 		return (error);
94 
95 	if (strcmp(np->nn_name, "*") == 0) {
96 		/* Star is special: No blanks, type, etc. */
97 		snb->snb_name[0] = '*';
98 	} else {
99 		/* Normal name: pad with blanks, add type. */
100 		snprintf(snb->snb_name, NB_NAMELEN,
101 		    "%-15.15s", np->nn_name);
102 		snb->snb_name[15] = (char)np->nn_type;
103 	}
104 
105 	if (peer) {
106 		/*LINTED*/
107 		sin = (struct sockaddr_in *)peer;
108 		snb->snb_ipaddr = sin->sin_addr.s_addr;
109 	}
110 	*dst = snb;
111 	return (0);
112 }
113 
114 int
nb_name_len(struct nb_name * np)115 nb_name_len(struct nb_name *np)
116 {
117 	char *name;
118 	int len, sclen;
119 
120 	len = 1 + NB_ENCNAMELEN;
121 	if (np->nn_scope == NULL)
122 		return (len + 1);
123 	sclen = 0;
124 	for (name = np->nn_scope; *name; name++) {
125 		if (*name == '.') {
126 			sclen = 0;
127 		} else {
128 			if (sclen < NB_MAXLABLEN) {
129 				sclen++;
130 				len++;
131 			}
132 		}
133 	}
134 	return (len + 1);
135 }
136 
137 int
nb_encname_len(const uchar_t * str)138 nb_encname_len(const uchar_t *str)
139 {
140 	const uchar_t *cp = str;
141 	int len, blen;
142 
143 	if ((cp[0] & 0xc0) == 0xc0)
144 		return (-1);	/* first two bytes are offset to name */
145 
146 	len = 1;
147 	for (;;) {
148 		blen = *cp;
149 		if (blen++ == 0)
150 			break;
151 		len += blen;
152 		cp += blen;
153 	}
154 	return (len);
155 }
156 
157 int
nb_name_encode(struct mbdata * mbp,struct nb_name * nn)158 nb_name_encode(struct mbdata *mbp, struct nb_name *nn)
159 {
160 	char *plen;
161 	uchar_t ch;
162 	char *p, namebuf[NB_NAMELEN+1];
163 	int i, lblen;
164 
165 	bcopy(nn->nn_name, namebuf, NB_NAMELEN);
166 	namebuf[NB_NAMELEN-1] = (char)nn->nn_type;
167 	namebuf[NB_NAMELEN] = '\0'; /* for debug */
168 
169 	/*
170 	 * Do the NetBIOS "first-level encoding" here.
171 	 * (RFC1002 explains this weirdness...)
172 	 *
173 	 * Here is what we marshall:
174 	 *   uint8_t NAME_LENGTH (always 32)
175 	 *   uint8_t ENCODED_NAME[32]
176 	 *   uint8_t SCOPE_LENGTH
177 	 *   Scope follows here, then another null.
178 	 */
179 
180 	/* NAME_LENGTH */
181 	mb_put_uint8(mbp, (2 * NB_NAMELEN));
182 
183 	/* ENCODED_NAME */
184 	for (i = 0; i < NB_NAMELEN; i++) {
185 		ch = namebuf[i];
186 		mb_put_uint8(mbp, 'A' + ((ch >> 4) & 0xF));
187 		mb_put_uint8(mbp, 'A' + ((ch) & 0xF));
188 	}
189 
190 	/*
191 	 * NetBIOS "scope" sting encoding,
192 	 * a.k.a second-level encoding.
193 	 * See RFC1002 for the details.
194 	 *
195 	 * Note: plen points to the length byte at the
196 	 * start of each string.  This keeps a pointer
197 	 * to the location and fills it in after the
198 	 * length of the string is determined.
199 	 *
200 	 * One string of length zero terminates.
201 	 * With no scope string, the zero-length
202 	 * string is the only thing there.
203 	 */
204 	if (nn->nn_scope == NULL) {
205 		mb_put_uint8(mbp, 0);
206 		return (0);
207 	}
208 
209 	(void) mb_fit(mbp, 1, &plen);
210 	*plen = 0; /* will update below */
211 	lblen = 0;
212 	for (p = nn->nn_scope; ; p++) {
213 		if (*p == '\0') {
214 			*plen = lblen;
215 			if (lblen)
216 				mb_put_uint8(mbp, 0);
217 			break;
218 		}
219 		if (*p == '.') {
220 			*plen = lblen;
221 			(void) mb_fit(mbp, 1, &plen);
222 			*plen = 0;
223 			lblen = 0;
224 		} else {
225 			if (lblen < NB_MAXLABLEN) {
226 				mb_put_uint8(mbp, *p);
227 				lblen++;
228 			}
229 		}
230 	}
231 
232 	return (0);
233 }
234