usr/src/lib/libsmbfs/smb/findvc.c

   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
  27 /*
  28  * Find existing an VC given a list of addresses.
  29  */
  30
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <strings.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include <netdb.h>
  38 #include <libintl.h>
  39 #include <xti.h>
  40 #include <assert.h>
  41
  42 #include <sys/types.h>
  43 #include <sys/time.h>
  44 #include <sys/byteorder.h>
  45 #include <sys/socket.h>
  46 #include <sys/fcntl.h>
  47
  48 #include <netinet/in.h>
  49 #include <netinet/tcp.h>
  50 #include <arpa/inet.h>
  51
  52 #include <netsmb/smb.h>
  53 #include <netsmb/smb_lib.h>
  54 #include <netsmb/netbios.h>
  55 #include <netsmb/nb_lib.h>
  56 #include <netsmb/smb_dev.h>
  57
  58 #include "charsets.h"
  59 #include "private.h"
  60
  61 /*
  62  * Ask the driver if it has a VC with this IP address.
  63  */
  64 static int
  65 findvc(struct smb_ctx *ctx, struct addrinfo *ai)
  66 {
  67         smbioc_ossn_t *ssn = &ctx->ct_ssn;
  68
  69         /*
  70          * Copy the passed address into ssn_srvaddr,
  71          * but first sanity-check lengths.  Also,
  72          * zero it first to avoid trailing junk.
  73          */
  74         if (ai->ai_addrlen > sizeof (ssn->ssn_srvaddr))
  75                 return (EINVAL);
  76         bzero(&ssn->ssn_srvaddr, sizeof (ssn->ssn_srvaddr));
  77         bcopy(ai->ai_addr, &ssn->ssn_srvaddr, ai->ai_addrlen);
  78
  79         if (ioctl(ctx->ct_dev_fd, SMBIOC_SSN_FIND, ssn) == -1)
  80                 return (errno);
  81
  82         return (0);
  83 }
  84
  85 /*
  86  * Find (and reuse) an existing VC.
  87  * See also: newvc.c
  88  */
  89 int
  90 smb_ctx_findvc(struct smb_ctx *ctx)
  91 {
  92         struct addrinfo *ai;
  93         int err;
  94
  95         /* Should already have the address list. */
  96         if ((ctx->ct_flags & SMBCF_RESOLVED) == 0)
  97                 return (EINVAL);
  98
  99         if (ctx->ct_dev_fd < 0) {
 100                 if ((err = smb_ctx_gethandle(ctx)))
 101                         return (err);
 102         }
 103
 104         for (ai = ctx->ct_addrinfo; ai; ai = ai->ai_next) {
 105
 106                 switch (ai->ai_family) {
 107
 108                 case AF_INET:
 109                 case AF_INET6:
 110                 case AF_NETBIOS:
 111                         err = findvc(ctx, ai);
 112                         break;
 113
 114                 default:
 115                         DPRINT("skipped family %d", ai->ai_family);
 116                         err = EPROTONOSUPPORT;
 117                         break;
 118                 }
 119
 120                 if (err == 0) {
 121                         /* re-use an existing VC */
 122                         ctx->ct_flags |= SMBCF_SSNACTIVE;
 123                         return (0);
 124                 }
 125         }
 126
 127         return (ENOENT);
 128 }
 129
 130 /*
 131  * Forcibly disconnect the current session, even if
 132  * there are others using it!  This is used by the
 133  * SMB server netlogon when it wants to setup a new
 134  * logon session and does not want any re-use.
 135  */
 136 int
 137 smb_ctx_kill(struct smb_ctx *ctx)
 138 {
 139
 140         if (ioctl(ctx->ct_dev_fd, SMBIOC_SSN_KILL, NULL) == -1)
 141                 return (errno);
 142
 143         return (0);
 144 }