usr/src/cmd/krb5/kwarn/kwarnd_handle.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 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      from kerbd_handle.c     1.3     92/01/29 SMI */
  28
  29 /*
  30  * kwarnd_handle.c, Interface to kwarnd
  31  *
  32  */
  33
  34 #include <unistd.h>
  35 #include <rpc/rpc.h>
  36 #include <rpc/clnt.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <netconfig.h>
  40 #include <sys/utsname.h>
  41 #include "kwarnd.h"
  42
  43 #ifdef DEBUG
  44 #define dprt(msg)
  45 #else
  46 #define dprt(msg)
  47 #endif /* DEBUG */
  48
  49 CLIENT *kwarn_clnt;
  50
  51 /*
  52  * Keep the handle cached.  This call may be made quite often.
  53  */
  54
  55 CLIENT *
  56 getkwarnd_handle(void)
  57 {
  58         void *localhandle;
  59         struct netconfig *nconf;
  60         struct netconfig *tpconf;
  61         struct timeval wait_time;
  62         struct utsname u;
  63         static char *hostname;
  64         static bool_t first_time = TRUE;
  65
  66 /*
  67  * Total timeout (in seconds) talking to kwarnd.
  68  */
  69 #define TOTAL_TIMEOUT   5
  70
  71         if (kwarn_clnt)
  72                 return (kwarn_clnt);
  73         if (!(localhandle = setnetconfig()))
  74                 return (NULL);
  75         tpconf = NULL;
  76         if (first_time == TRUE) {
  77                 if (uname(&u) == -1) {
  78                         (void) endnetconfig(localhandle);
  79                         return ((CLIENT *)NULL);
  80                 }
  81                 if ((hostname = strdup(u.nodename)) == NULL) {
  82                         (void) endnetconfig(localhandle);
  83                         return ((CLIENT *)NULL);
  84                 }
  85                 first_time = FALSE;
  86         }
  87         while (nconf = getnetconfig(localhandle)) {
  88                 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
  89                         if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
  90                                 kwarn_clnt = clnt_tp_create(hostname,
  91                                     KWARNPROG, KWARNVERS, nconf);
  92                                 if (kwarn_clnt) {
  93                                         dprt("got COTS_ORD\n");
  94                                         break;
  95                                 }
  96                         } else {
  97                                 tpconf = nconf;
  98                         }
  99                 }
 100         }
 101         if ((kwarn_clnt == NULL) && (tpconf)) {
 102
 103                 /* Now, try the connection-oriented loopback transport */
 104
 105                 kwarn_clnt = clnt_tp_create(hostname, KWARNPROG, KWARNVERS,
 106                     tpconf);
 107 #ifdef DEBUG
 108                 if (kwarn_clnt) {
 109                         dprt("got COTS\n");
 110                 }
 111 #endif  /* DEBUG */
 112         }
 113         (void) endnetconfig(localhandle);
 114
 115         /*
 116          * This bit of code uses an as yet unimplemented argument to
 117          * clnt_control(). CLSET_SVC_PRIV specifies that the underlying
 118          * loopback transport should be checked to ensure it is
 119          * connected to a process running as root. If so, the clnt_control()
 120          * call returns TRUE. If not, it returns FALSE.
 121          */
 122
 123 #ifdef CLSET_SVC_PRIV
 124
 125         if (clnt_control(kwarn_clnt, CLSET_SVC_PRIV, NULL) != TRUE) {
 126                 clnt_destroy(kwarn_clnt);
 127                 kwarn_clnt = NULL;
 128                 return (NULL);
 129         {
 130 #endif
 131         if (kwarn_clnt == NULL)
 132                 return (NULL);
 133
 134         kwarn_clnt->cl_auth = authsys_create("", getuid(), 0, 0, NULL);
 135         if (kwarn_clnt->cl_auth == NULL) {
 136                 clnt_destroy(kwarn_clnt);
 137                 kwarn_clnt = NULL;
 138                 return (NULL);
 139         }
 140         wait_time.tv_sec = TOTAL_TIMEOUT;
 141         wait_time.tv_usec = 0;
 142         (void) clnt_control(kwarn_clnt, CLSET_TIMEOUT, (char *)&wait_time);
 143
 144         return (kwarn_clnt);
 145 }
 146
 147 void
 148 resetkwarnd_handle(void)
 149 {
 150         auth_destroy(kwarn_clnt->cl_auth);
 151         clnt_destroy(kwarn_clnt);
 152         kwarn_clnt = NULL;
 153 }