usr/src/cmd/fs.d/nfs/lib/selfcheck.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  * selfcheck.c
  23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <errno.h>
  28 #include <syslog.h>
  29
  30 #include <strings.h>
  31 #include <malloc.h>
  32 #include <stdio.h>
  33 #include <unistd.h>
  34 #include <sys/sockio.h>
  35 #include <netinet/in.h>
  36 #include <sys/socket.h>
  37 #include <netdb.h>
  38 #include <net/if.h>
  39
  40 int
  41 self_check(char *hostname)
  42 {
  43         int s, res = 0;
  44         struct sioc_addrreq areq;
  45
  46         struct hostent *hostinfo;
  47         int family;
  48         int flags;
  49         int error_num;
  50         char **hostptr;
  51
  52         struct sockaddr_in6 ipv6addr;
  53
  54         family = AF_INET6;
  55         /*
  56          * We cannot specify AI_DEFAULT since it includes AI_ADDRCONFIG.
  57          * Localhost name resolution will fail if no IP interfaces other than
  58          * loopback are plumbed and AI_ADDRCONFIG is specified, and this
  59          * causes localhost mounts to fail.
  60          */
  61         flags = AI_V4MAPPED;
  62
  63         if ((s = socket(family, SOCK_DGRAM, 0)) < 0) {
  64                 syslog(LOG_ERR, "self_check: socket: %m");
  65                 return (0);
  66         }
  67
  68         if ((hostinfo = getipnodebyname(hostname, family, flags,
  69             &error_num)) == NULL) {
  70
  71                 if (error_num == TRY_AGAIN)
  72                         syslog(LOG_DEBUG,
  73                             "self_check: unknown host: %s (try again later)\n",
  74                             hostname);
  75                 else
  76                         syslog(LOG_DEBUG,
  77                             "self_check: unknown host: %s\n", hostname);
  78
  79                 (void) close(s);
  80                 return (0);
  81         }
  82
  83         for (hostptr = hostinfo->h_addr_list; *hostptr; hostptr++) {
  84                 bzero(&ipv6addr, sizeof (ipv6addr));
  85                 ipv6addr.sin6_family = AF_INET6;
  86                 ipv6addr.sin6_addr = *((struct in6_addr *)(*hostptr));
  87                 memcpy(&areq.sa_addr, (void *)&ipv6addr, sizeof (ipv6addr));
  88                 areq.sa_res = -1;
  89                 (void) ioctl(s, SIOCTMYADDR, (caddr_t)&areq);
  90                 if (areq.sa_res == 1) {
  91                         res = 1;
  92                         break;
  93                 }
  94         }
  95
  96         freehostent(hostinfo);
  97
  98         (void) close(s);
  99         return (res);
 100 }
 101
 102 #define MAXIFS  32
 103
 104 /*
 105  * create an ifconf structure that represents all the interfaces
 106  * configured for this host.  Two buffers are allcated here:
 107  *      lifc - the ifconf structure returned
 108  *      lifc->lifc_buf - the list of ifreq structures
 109  * Both of the buffers must be freed by the calling routine.
 110  * A NULL pointer is returned upon failure.  In this case any
 111  * data that was allocated before the failure has already been
 112  * freed.
 113  */
 114 struct lifconf *
 115 getmyaddrs(void)
 116 {
 117         int sock;
 118         struct lifnum lifn;
 119         int numifs;
 120         char *buf;
 121         struct lifconf *lifc;
 122
 123         if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 124                 syslog(LOG_ERR, "statd:getmyaddrs socket: %m");
 125                 return ((struct lifconf *)NULL);
 126         }
 127
 128         lifn.lifn_family = AF_UNSPEC;
 129         lifn.lifn_flags = 0;
 130
 131         if (ioctl(sock, SIOCGLIFNUM, (char *)&lifn) < 0) {
 132                 syslog(LOG_ERR,
 133                 "statd:getmyaddrs, get number of interfaces, error: %m");
 134                 numifs = MAXIFS;
 135         }
 136
 137         numifs = lifn.lifn_count;
 138
 139         lifc = (struct lifconf *)malloc(sizeof (struct lifconf));
 140         if (lifc == NULL) {
 141                 syslog(LOG_ERR,
 142                     "statd:getmyaddrs, malloc for lifconf failed: %m");
 143                 (void) close(sock);
 144                 return ((struct lifconf *)NULL);
 145         }
 146         buf = (char *)malloc(numifs * sizeof (struct lifreq));
 147         if (buf == NULL) {
 148                 syslog(LOG_ERR,
 149                     "statd:getmyaddrs, malloc for lifreq failed: %m");
 150                 (void) close(sock);
 151                 free(lifc);
 152                 return ((struct lifconf *)NULL);
 153         }
 154
 155         lifc->lifc_family = AF_UNSPEC;
 156         lifc->lifc_flags = 0;
 157         lifc->lifc_buf = buf;
 158         lifc->lifc_len = numifs * sizeof (struct lifreq);
 159
 160         if (ioctl(sock, SIOCGLIFCONF, (char *)lifc) < 0) {
 161                 syslog(LOG_ERR, "statd:getmyaddrs, SIOCGLIFCONF, error: %m");
 162                 (void) close(sock);
 163                 free(buf);
 164                 free(lifc);
 165                 return ((struct lifconf *)NULL);
 166         }
 167
 168         (void) close(sock);
 169
 170         return (lifc);
 171 }
 172
 173 int
 174 Is_ipv6present(void)
 175 {
 176         int sock;
 177         struct lifnum lifn;
 178
 179         sock = socket(AF_INET6, SOCK_DGRAM, 0);
 180         if (sock < 0)
 181                 return (0);
 182
 183         lifn.lifn_family = AF_INET6;
 184         lifn.lifn_flags = 0;
 185         if (ioctl(sock, SIOCGLIFNUM, (char *)&lifn) < 0) {
 186                 close(sock);
 187                 return (0);
 188         }
 189         close(sock);
 190         if (lifn.lifn_count == 0)
 191                 return (0);
 192         return (1);
 193 }