/*
- * support/export/hostname.c
+ * Copyright 2010 Oracle. All rights reserved.
*
- * Functions for hostname.
+ * This file is part of nfs-utils.
*
+ * nfs-utils is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * nfs-utils is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with nfs-utils. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
-/*
-#define TEST
-*/
-
#include <string.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
#include <stdlib.h>
+#include <arpa/inet.h>
+#include <netdb.h>
#include <errno.h>
-#include <xlog.h>
-#ifdef TEST
-#define xmalloc malloc
-#else
-#include "xmalloc.h"
-#include "misc.h"
-#endif
-
#include "sockaddr.h"
#include "exportfs.h"
#define AI_ADDRCONFIG 0
#endif
-#define ALIGNMENT sizeof (char *)
-
-static int
-align (int len, int al)
-{
- int i;
- i = len % al;
- if (i)
- len += al - i;
- return len;
-}
-
-struct hostent *
-get_hostent (const char *addr, int len, int type)
-{
- struct hostent *cp;
- int len_ent;
- const char *name;
- int len_name;
- int num_aliases = 1;
- int len_aliases = sizeof (char *);
- int num_addr_list = 1;
- int len_addr_list = sizeof (char *);
- int pos;
- struct in_addr *ipv4;
-
- switch (type)
- {
- case AF_INET:
- ipv4 = (struct in_addr *) addr;
- name = inet_ntoa (*ipv4);
- break;
-
- default:
- return NULL;
- }
-
- len_ent = align (sizeof (*cp), ALIGNMENT);
- len_name = align (strlen (name) + 1, ALIGNMENT);
-
- num_addr_list++;
- len_addr_list += align (len, ALIGNMENT) + sizeof (char *);
-
- cp = (struct hostent *) xmalloc (len_ent + len_name + len_aliases
- + len_addr_list);
-
- cp->h_addrtype = type;
- cp->h_length = len;
- pos = len_ent;
- cp->h_name = (char *) &(((char *) cp) [pos]);
- strcpy (cp->h_name, name);
-
- pos += len_name;
- cp->h_aliases = (char **) &(((char *) cp) [pos]);
- pos += num_aliases * sizeof (char *);
- cp->h_aliases [0] = NULL;
-
- pos = len_ent + len_name + len_aliases;
- cp->h_addr_list = (char **) &(((char *) cp) [pos]);
- pos += num_addr_list * sizeof (char *);
- cp->h_addr_list [0] = (char *) &(((char *) cp) [pos]);
- memcpy (cp->h_addr_list [0], addr, cp->h_length);
- pos += align (cp->h_length, ALIGNMENT);
- cp->h_addr_list [1] = NULL;
-
- return cp;
-}
-
-struct hostent *
-hostent_dup (struct hostent *hp)
-{
- int len_ent = align (sizeof (*hp), ALIGNMENT);
- int len_name = align (strlen (hp->h_name) + 1, ALIGNMENT);
- int num_aliases = 1;
- int len_aliases = sizeof (char *);
- int num_addr_list = 1;
- int len_addr_list = sizeof (char *);
- int pos, i;
- char **sp;
- struct hostent *cp;
-
- for (sp = hp->h_aliases; sp && *sp; sp++)
- {
- num_aliases++;
- len_aliases += align (strlen (*sp) + 1, ALIGNMENT)
- + sizeof (char *);
- }
-
- for (sp = hp->h_addr_list; *sp; sp++)
- {
- num_addr_list++;
- len_addr_list += align (hp->h_length, ALIGNMENT)
- + sizeof (char *);
- }
-
- cp = (struct hostent *) xmalloc (len_ent + len_name + len_aliases
- + len_addr_list);
-
- *cp = *hp;
- pos = len_ent;
- cp->h_name = (char *) &(((char *) cp) [pos]);
- strcpy (cp->h_name, hp->h_name);
-
- pos += len_name;
- cp->h_aliases = (char **) &(((char *) cp) [pos]);
- pos += num_aliases * sizeof (char *);
- for (sp = hp->h_aliases, i = 0; i < num_aliases; i++, sp++)
- if (sp && *sp)
- {
- cp->h_aliases [i] = (char *) &(((char *) cp) [pos]);
- strcpy (cp->h_aliases [i], *sp);
- pos += align (strlen (*sp) + 1, ALIGNMENT);
- }
- else
- cp->h_aliases [i] = NULL;
-
- pos = len_ent + len_name + len_aliases;
- cp->h_addr_list = (char **) &(((char *) cp) [pos]);
- pos += num_addr_list * sizeof (char *);
- for (sp = hp->h_addr_list, i = 0; i < num_addr_list; i++, sp++)
- if (*sp)
- {
- cp->h_addr_list [i] = (char *) &(((char *) cp) [pos]);
- memcpy (cp->h_addr_list [i], *sp, hp->h_length);
- pos += align (hp->h_length, ALIGNMENT);
- }
- else
- cp->h_addr_list [i] = *sp;
-
- return cp;
-}
-
#ifdef HAVE_GETNAMEINFO
static socklen_t
sockaddr_size(const struct sockaddr *sap)
return ai;
}
#endif /* !HAVE_GETNAMEINFO */
-
-static int
-is_hostname(const char *sp)
-{
- if (*sp == '\0' || *sp == '@')
- return 0;
-
- for (; *sp; sp++)
- {
- if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
- return 0;
- if (*sp == '\\' && sp[1])
- sp++;
- }
-
- return 1;
-}
-
-int
-matchhostname (const char *h1, const char *h2)
-{
- struct hostent *hp1, *hp2;
- int status;
-
- if (strcasecmp (h1, h2) == 0)
- return 1;
-
- if (!is_hostname (h1) || !is_hostname (h2))
- return 0;
-
- hp1 = gethostbyname (h1);
- if (hp1 == NULL)
- return 0;
-
- hp1 = hostent_dup (hp1);
-
- hp2 = gethostbyname (h2);
- if (hp2)
- {
- if (strcasecmp (hp1->h_name, hp2->h_name) == 0)
- status = 1;
- else
- {
- char **ap1, **ap2;
-
- status = 0;
- for (ap1 = hp1->h_addr_list; *ap1 && status == 0; ap1++)
- for (ap2 = hp2->h_addr_list; *ap2; ap2++)
- if (memcmp (*ap1, *ap2, sizeof (struct in_addr)) == 0)
- {
- status = 1;
- break;
- }
- }
- }
- else
- status = 0;
-
- free (hp1);
- return status;
-}
-
-
-/* Map IP to hostname, and then map back to addr to make sure it is a
- * reliable hostname
- */
-struct hostent *
-get_reliable_hostbyaddr(const char *addr, int len, int type)
-{
- struct hostent *hp = NULL;
-
- struct hostent *reverse;
- struct hostent *forward;
- char **sp;
-
- reverse = gethostbyaddr (addr, len, type);
- if (!reverse)
- return NULL;
-
- /* must make sure the hostent is authorative. */
-
- reverse = hostent_dup (reverse);
- forward = gethostbyname (reverse->h_name);
-
- if (forward) {
- /* now make sure the "addr" is in the list */
- for (sp = forward->h_addr_list ; *sp ; sp++) {
- if (memcmp (*sp, addr, forward->h_length) == 0)
- break;
- }
-
- if (*sp) {
- /* it's valid */
- hp = hostent_dup (forward);
- }
- else {
- /* it was a FAKE */
- xlog (L_WARNING, "Fake hostname %s for %s - forward lookup doesn't match reverse",
- reverse->h_name, inet_ntoa(*(struct in_addr*)addr));
- }
- }
- else {
- /* never heard of it. misconfigured DNS? */
- xlog (L_WARNING, "Fake hostname %s for %s - forward lookup doesn't exist",
- reverse->h_name, inet_ntoa(*(struct in_addr*)addr));
- }
-
- free (reverse);
- return hp;
-}
-
-
-#ifdef TEST
-void
-print_host (struct hostent *hp)
-{
- char **sp;
-
- if (hp)
- {
- printf ("official hostname: %s\n", hp->h_name);
- printf ("aliases:\n");
- for (sp = hp->h_aliases; *sp; sp++)
- printf (" %s\n", *sp);
- printf ("IP addresses:\n");
- for (sp = hp->h_addr_list; *sp; sp++)
- printf (" %s\n", inet_ntoa (*(struct in_addr *) *sp));
- }
- else
- printf ("Not host information\n");
-}
-
-int
-main (int argc, char **argv)
-{
- struct hostent *hp = gethostbyname (argv [1]);
- struct hostent *cp;
- struct in_addr addr;
-
- print_host (hp);
-
- if (hp)
- {
- cp = hostent_dup (hp);
- print_host (cp);
- free (cp);
- }
- printf ("127.0.0.1 == %s: %d\n", argv [1],
- matchhostname ("127.0.0.1", argv [1]));
- addr.s_addr = inet_addr(argv [2]);
- printf ("%s\n", inet_ntoa (addr));
- cp = get_hostent ((const char *)&addr, sizeof(addr), AF_INET);
- print_host (cp);
- return 0;
-}
-#endif
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