usr/src/cmd/fs.d/nfs/nfslog/nfslog_ipaddr.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1991, 1999 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #include <stdio.h>
  28 #include <ctype.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31 #include <malloc.h>
  32 #include <sys/socket.h>
  33 #include <sys/sockio.h>
  34 #include <arpa/inet.h>
  35 #include <net/if.h>
  36 #include <netinet/in.h>
  37 #include <netinet/in_systm.h>
  38 #include <netinet/if_ether.h>
  39 #include <netinet/ip.h>
  40 #include <netdb.h>
  41 #include <string.h>
  42 #include <signal.h>
  43 #include <setjmp.h>
  44
  45 /*
  46  * Note: If making changes to this file, check also the file
  47  *       cmd/cmd-inet/usr.sbin/snoop/snoop_ipaddr.c
  48  *       as it has the same functions there.
  49  */
  50 static jmp_buf nisjmp;
  51
  52 #define MAXHASH 1024  /* must be a power of 2 */
  53
  54 struct hostdata {
  55         struct hostdata *h_next;
  56         char            *h_hostname;
  57         int             h_pktsout;
  58         int             h_pktsin;
  59 };
  60
  61 struct hostdata4 {
  62         struct hostdata4        *h4_next;
  63         char            *h4_hostname;
  64         int             h4_pktsout;
  65         int             h4_pktsin;
  66         struct in_addr  h4_addr;
  67 };
  68
  69 struct hostdata6 {
  70         struct hostdata6        *h6_next;
  71         char            *h6_hostname;
  72         int             h6_pktsout;
  73         int             h6_pktsin;
  74         struct in6_addr h6_addr;
  75 };
  76
  77 static struct hostdata *addhost(int, void *, char *);
  78
  79 static struct hostdata4 *h_table4[MAXHASH];
  80 static struct hostdata6 *h_table6[MAXHASH];
  81
  82 #define iphash(e)  ((e) & (MAXHASH-1))
  83
  84 /* ARGSUSED */
  85 static void
  86 wakeup(int n)
  87 {
  88         longjmp(nisjmp, 1);
  89 }
  90
  91 extern char *inet_ntoa();
  92
  93 static struct hostdata *
  94 iplookup(ipaddr)
  95         struct in_addr *ipaddr;
  96 {
  97         register struct hostdata4 *h;
  98         struct hostent *hp = NULL;
  99         struct netent *np;
 100         int error_num;
 101
 102         for (h = h_table4[iphash(ipaddr->s_addr)]; h; h = h->h4_next) {
 103                 if (h->h4_addr.s_addr == ipaddr->s_addr)
 104                         return ((struct hostdata *)h);
 105         }
 106
 107         /* not found.  Put it in */
 108
 109         if (ipaddr->s_addr == htonl(INADDR_BROADCAST))
 110                 return (addhost(AF_INET, ipaddr, "BROADCAST"));
 111         if (ipaddr->s_addr == htonl(INADDR_ANY))
 112                 return (addhost(AF_INET, ipaddr, "OLD-BROADCAST"));
 113
 114         /*
 115          * Set an alarm here so we don't get held up by
 116          * an unresponsive name server.
 117          * Give it 3 sec to do its work.
 118          */
 119         if (setjmp(nisjmp) == 0) {
 120                 (void) signal(SIGALRM, wakeup);
 121                 (void) alarm(3);
 122                 hp = getipnodebyaddr((char *)ipaddr, sizeof (struct in_addr),
 123                     AF_INET, &error_num);
 124                 if (hp == NULL && inet_lnaof(*ipaddr) == 0) {
 125                         np = getnetbyaddr(inet_netof(*ipaddr), AF_INET);
 126                         if (np)
 127                                 return (addhost(AF_INET, ipaddr, np->n_name));
 128                 }
 129                 (void) alarm(0);
 130         } else {
 131                 hp = NULL;
 132         }
 133
 134         return (addhost(AF_INET, ipaddr, hp ? hp->h_name : inet_ntoa(*ipaddr)));
 135 }
 136
 137 static struct hostdata *
 138 ip6lookup(ip6addr)
 139         struct in6_addr *ip6addr;
 140 {
 141         struct hostdata6 *h;
 142         struct hostent *hp = NULL;
 143         int error_num;
 144         char addrstr[INET6_ADDRSTRLEN];
 145         char *addname;
 146         struct hostdata *retval;
 147
 148         for (h = h_table6[iphash(((uint32_t *)ip6addr)[3])]; h;
 149             h = h->h6_next) {
 150                 if (IN6_ARE_ADDR_EQUAL(&h->h6_addr, ip6addr))
 151                         return ((struct hostdata *)h);
 152         }
 153
 154         /* not in the hash table, put it in */
 155         if (IN6_IS_ADDR_UNSPECIFIED(ip6addr))
 156                 return (addhost(AF_INET6, ip6addr, "UNSPECIFIED"));
 157
 158         /*
 159          * Set an alarm here so we don't get held up by
 160          * an unresponsive name server.
 161          * Give it 3 sec to do its work.
 162          */
 163         if (setjmp(nisjmp) == 0) {
 164                 (void) signal(SIGALRM, wakeup);
 165                 (void) alarm(3);
 166                 hp = getipnodebyaddr(ip6addr, sizeof (struct in6_addr),
 167                     AF_INET6, &error_num);
 168                 (void) alarm(0);
 169         } else {
 170                 hp = NULL;
 171         }
 172
 173         if (hp != NULL)
 174                 addname = hp->h_name;
 175         else {
 176                 (void) inet_ntop(AF_INET6, ip6addr, addrstr, INET6_ADDRSTRLEN);
 177                 addname = addrstr;
 178         }
 179
 180         retval = addhost(AF_INET6, ip6addr, addname);
 181         freehostent(hp);
 182         return (retval);
 183 }
 184
 185 static struct hostdata *
 186 addhost(family, ipaddr, name)
 187         int family;
 188         void *ipaddr;
 189         char *name;
 190 {
 191         register struct hostdata **hp, *n;
 192         int hashval;
 193
 194         switch (family) {
 195         case AF_INET:
 196                 n = (struct hostdata *)malloc(sizeof (struct hostdata4));
 197                 if (n == NULL)
 198                         goto alloc_failed;
 199
 200                 (void) memset(n, 0, sizeof (struct hostdata4));
 201                 n->h_hostname = strdup(name);
 202                 if (n->h_hostname == NULL)
 203                         goto alloc_failed;
 204
 205                 ((struct hostdata4 *)n)->h4_addr = *(struct in_addr *)ipaddr;
 206                 hashval = ((struct in_addr *)ipaddr)->s_addr;
 207                 hp = (struct hostdata **)&h_table4[iphash(hashval)];
 208                 break;
 209         case AF_INET6:
 210                 n = (struct hostdata *)malloc(sizeof (struct hostdata6));
 211                 if (n == NULL)
 212                         goto alloc_failed;
 213
 214                 (void) memset(n, 0, sizeof (struct hostdata6));
 215                 n->h_hostname = strdup(name);
 216                 if (n->h_hostname == NULL)
 217                         goto alloc_failed;
 218
 219                 (void) memcpy(&((struct hostdata6 *)n)->h6_addr, ipaddr,
 220                     sizeof (struct in6_addr));
 221                 hashval = ((int *)ipaddr)[3];
 222                 hp = (struct hostdata **)&h_table6[iphash(hashval)];
 223                 break;
 224         default:
 225                 (void) fprintf(stderr,
 226                         "nfslog: addhost ERROR: Unknown address family: %d",
 227                         family);
 228                 return (NULL);
 229         }
 230
 231         n->h_next = *hp;
 232         *hp = n;
 233
 234         return (n);
 235
 236 alloc_failed:
 237         (void) fprintf(stderr, "addhost: no mem\n");
 238         free(n);
 239         return (NULL);
 240 }
 241
 242 char *
 243 addrtoname(void *sockp)
 244 {
 245         struct hostdata *hostp;
 246         int family = ((struct sockaddr_in *)sockp)->sin_family;
 247
 248         switch (family) {
 249         case AF_INET:
 250                 hostp = iplookup(&((struct sockaddr_in *)sockp)->sin_addr);
 251                 break;
 252         case AF_INET6:
 253                 hostp = ip6lookup(&((struct sockaddr_in6 *)sockp)->sin6_addr);
 254                 break;
 255         default:
 256                 (void) fprintf(stderr, "nfslog: ERROR: unknown address " \
 257                     "family: %d\n", family);
 258                 hostp = NULL;
 259         }
 260         return ((hostp != NULL) ? hostp->h_hostname : NULL);
 261 }