xref: /illumos-gate/usr/src/lib/libsmbfs/smb/findvc.c (revision 40c0e2317898b8c774791bdc2b30bd50111ab1fa)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
27  */
28 
29 /*
30  * Find existing an VC given a list of addresses.
31  */
32 
33 #include <errno.h>
34 #include <stdio.h>
35 #include <string.h>
36 #include <strings.h>
37 #include <stdlib.h>
38 #include <unistd.h>
39 #include <netdb.h>
40 #include <libintl.h>
41 #include <xti.h>
42 #include <assert.h>
43 
44 #include <sys/types.h>
45 #include <sys/time.h>
46 #include <sys/byteorder.h>
47 #include <sys/socket.h>
48 #include <sys/fcntl.h>
49 
50 #include <netinet/in.h>
51 #include <netinet/tcp.h>
52 #include <arpa/inet.h>
53 
54 #include <netsmb/smb.h>
55 #include <netsmb/smb_lib.h>
56 #include <netsmb/netbios.h>
57 #include <netsmb/nb_lib.h>
58 #include <netsmb/smb_dev.h>
59 
60 #include "charsets.h"
61 #include "private.h"
62 
63 /*
64  * Ask the driver if it has a VC with this IP address.
65  */
66 static int
findvc(struct smb_ctx * ctx,struct addrinfo * ai)67 findvc(struct smb_ctx *ctx, struct addrinfo *ai)
68 {
69 	smbioc_ossn_t *ssn = &ctx->ct_ssn;
70 
71 	/*
72 	 * Copy the passed address into ssn_srvaddr,
73 	 * but first sanity-check lengths.  Also,
74 	 * zero it first to avoid trailing junk.
75 	 */
76 	if (ai->ai_addrlen > sizeof (ssn->ssn_srvaddr))
77 		return (EINVAL);
78 	bzero(&ssn->ssn_srvaddr, sizeof (ssn->ssn_srvaddr));
79 	bcopy(ai->ai_addr, &ssn->ssn_srvaddr, ai->ai_addrlen);
80 
81 	if (nsmb_ioctl(ctx->ct_dev_fd, SMBIOC_SSN_FIND, ssn) == -1)
82 		return (errno);
83 
84 	return (0);
85 }
86 
87 /*
88  * Find (and reuse) an existing VC.
89  * See also: newvc.c
90  */
91 int
smb_ctx_findvc(struct smb_ctx * ctx)92 smb_ctx_findvc(struct smb_ctx *ctx)
93 {
94 	struct addrinfo *ai;
95 	int err;
96 
97 	/* Should already have the address list. */
98 	if ((ctx->ct_flags & SMBCF_RESOLVED) == 0)
99 		return (EINVAL);
100 
101 	if (ctx->ct_dev_fd < 0) {
102 		if ((err = smb_ctx_gethandle(ctx)))
103 			return (err);
104 	}
105 
106 	for (ai = ctx->ct_addrinfo; ai; ai = ai->ai_next) {
107 
108 		switch (ai->ai_family) {
109 
110 		case AF_INET:
111 		case AF_INET6:
112 		case AF_NETBIOS:
113 			err = findvc(ctx, ai);
114 			break;
115 
116 		default:
117 			DPRINT("skipped family %d", ai->ai_family);
118 			err = EPROTONOSUPPORT;
119 			break;
120 		}
121 
122 		if (err == 0) {
123 			/* re-use an existing VC */
124 			return (0);
125 		}
126 	}
127 
128 	return (ENOENT);
129 }
130 
131 /*
132  * Forcibly disconnect the current session, even if
133  * there are others using it!  This is used by the
134  * SMB server netlogon when it wants to setup a new
135  * logon session and does not want any re-use.
136  */
137 int
smb_ctx_kill(struct smb_ctx * ctx)138 smb_ctx_kill(struct smb_ctx *ctx)
139 {
140 
141 	if (nsmb_ioctl(ctx->ct_dev_fd, SMBIOC_SSN_KILL, NULL) == -1)
142 		return (errno);
143 
144 	return (0);
145 }
146