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-rw-r--r--source4/heimdal/lib/krb5/get_addrs.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/get_addrs.c b/source4/heimdal/lib/krb5/get_addrs.c
new file mode 100644
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+++ b/source4/heimdal/lib/krb5/get_addrs.c
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+/*
+ * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5_locl.h"
+
+RCSID("$Id: get_addrs.c 23815 2008-09-13 09:21:03Z lha $");
+
+#ifdef __osf__
+/* hate */
+struct rtentry;
+struct mbuf;
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#include <ifaddrs.h>
+
+static krb5_error_code
+gethostname_fallback (krb5_context context, krb5_addresses *res)
+{
+ krb5_error_code ret;
+ char hostname[MAXHOSTNAMELEN];
+ struct hostent *hostent;
+
+ if (gethostname (hostname, sizeof(hostname))) {
+ ret = errno;
+ krb5_set_error_message(context, ret, "gethostname: %s", strerror(ret));
+ return ret;
+ }
+ hostent = roken_gethostbyname (hostname);
+ if (hostent == NULL) {
+ ret = errno;
+ krb5_set_error_message (context, ret, "gethostbyname %s: %s",
+ hostname, strerror(ret));
+ return ret;
+ }
+ res->len = 1;
+ res->val = malloc (sizeof(*res->val));
+ if (res->val == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
+ }
+ res->val[0].addr_type = hostent->h_addrtype;
+ res->val[0].address.data = NULL;
+ res->val[0].address.length = 0;
+ ret = krb5_data_copy (&res->val[0].address,
+ hostent->h_addr,
+ hostent->h_length);
+ if (ret) {
+ free (res->val);
+ return ret;
+ }
+ return 0;
+}
+
+enum {
+ LOOP = 1, /* do include loopback interfaces */
+ LOOP_IF_NONE = 2, /* include loopback if no other if's */
+ EXTRA_ADDRESSES = 4, /* include extra addresses */
+ SCAN_INTERFACES = 8 /* scan interfaces for addresses */
+};
+
+/*
+ * Try to figure out the addresses of all configured interfaces with a
+ * lot of magic ioctls.
+ */
+
+static krb5_error_code
+find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
+{
+ struct sockaddr sa_zero;
+ struct ifaddrs *ifa0, *ifa;
+ krb5_error_code ret = ENXIO;
+ unsigned int num, idx;
+ krb5_addresses ignore_addresses;
+
+ res->val = NULL;
+
+ if (getifaddrs(&ifa0) == -1) {
+ ret = errno;
+ krb5_set_error_message(context, ret, "getifaddrs: %s", strerror(ret));
+ return (ret);
+ }
+
+ memset(&sa_zero, 0, sizeof(sa_zero));
+
+ /* First, count all the ifaddrs. */
+ for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
+ /* nothing */;
+
+ if (num == 0) {
+ freeifaddrs(ifa0);
+ krb5_set_error_message(context, ENXIO, N_("no addresses found", ""));
+ return (ENXIO);
+ }
+
+ if (flags & EXTRA_ADDRESSES) {
+ /* we'll remove the addresses we don't care about */
+ ret = krb5_get_ignore_addresses(context, &ignore_addresses);
+ if(ret)
+ return ret;
+ }
+
+ /* Allocate storage for them. */
+ res->val = calloc(num, sizeof(*res->val));
+ if (res->val == NULL) {
+ krb5_free_addresses(context, &ignore_addresses);
+ freeifaddrs(ifa0);
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
+ }
+
+ /* Now traverse the list. */
+ for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
+ if ((ifa->ifa_flags & IFF_UP) == 0)
+ continue;
+ if (ifa->ifa_addr == NULL)
+ continue;
+ if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
+ continue;
+ if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
+ continue;
+ if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
+ /* We'll deal with the LOOP_IF_NONE case later. */
+ if ((flags & LOOP) == 0)
+ continue;
+ }
+
+ ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
+ if (ret) {
+ /*
+ * The most likely error here is going to be "Program
+ * lacks support for address type". This is no big
+ * deal -- just continue, and we'll listen on the
+ * addresses who's type we *do* support.
+ */
+ continue;
+ }
+ /* possibly skip this address? */
+ if((flags & EXTRA_ADDRESSES) &&
+ krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
+ krb5_free_address(context, &res->val[idx]);
+ flags &= ~LOOP_IF_NONE; /* we actually found an address,
+ so don't add any loop-back
+ addresses */
+ continue;
+ }
+
+ idx++;
+ }
+
+ /*
+ * If no addresses were found, and LOOP_IF_NONE is set, then find
+ * the loopback addresses and add them to our list.
+ */
+ if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
+ for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
+ if ((ifa->ifa_flags & IFF_UP) == 0)
+ continue;
+ if (ifa->ifa_addr == NULL)
+ continue;
+ if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
+ continue;
+ if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
+ continue;
+
+ if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
+ ret = krb5_sockaddr2address(context,
+ ifa->ifa_addr, &res->val[idx]);
+ if (ret) {
+ /*
+ * See comment above.
+ */
+ continue;
+ }
+ if((flags & EXTRA_ADDRESSES) &&
+ krb5_address_search(context, &res->val[idx],
+ &ignore_addresses)) {
+ krb5_free_address(context, &res->val[idx]);
+ continue;
+ }
+ idx++;
+ }
+ }
+ }
+
+ if (flags & EXTRA_ADDRESSES)
+ krb5_free_addresses(context, &ignore_addresses);
+ freeifaddrs(ifa0);
+ if (ret) {
+ free(res->val);
+ res->val = NULL;
+ } else
+ res->len = idx; /* Now a count. */
+ return (ret);
+}
+
+static krb5_error_code
+get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
+{
+ krb5_error_code ret = -1;
+
+ if (flags & SCAN_INTERFACES) {
+ ret = find_all_addresses (context, res, flags);
+ if(ret || res->len == 0)
+ ret = gethostname_fallback (context, res);
+ } else {
+ res->len = 0;
+ res->val = NULL;
+ ret = 0;
+ }
+
+ if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
+ krb5_addresses a;
+ /* append user specified addresses */
+ ret = krb5_get_extra_addresses(context, &a);
+ if(ret) {
+ krb5_free_addresses(context, res);
+ return ret;
+ }
+ ret = krb5_append_addresses(context, res, &a);
+ if(ret) {
+ krb5_free_addresses(context, res);
+ return ret;
+ }
+ krb5_free_addresses(context, &a);
+ }
+ if(res->len == 0) {
+ free(res->val);
+ res->val = NULL;
+ }
+ return ret;
+}
+
+/*
+ * Try to get all addresses, but return the one corresponding to
+ * `hostname' if we fail.
+ *
+ * Only include loopback address if there are no other.
+ */
+
+krb5_error_code KRB5_LIB_FUNCTION
+krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
+{
+ int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
+
+ if (context->scan_interfaces)
+ flags |= SCAN_INTERFACES;
+
+ return get_addrs_int (context, res, flags);
+}
+
+/*
+ * Try to get all local addresses that a server should listen to.
+ * If that fails, we return the address corresponding to `hostname'.
+ */
+
+krb5_error_code KRB5_LIB_FUNCTION
+krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
+{
+ return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);
+}
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