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https://github.com/samba-team/samba.git
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3fbd1ae54c
new standard getifaddrs() and freeifaddrs() interfaces. Currently
we only return IPv4 af_families. Needs fixing for binds to IPv6
but this has to be careful work.
Jeremy.
(This used to be commit 327875182c
)
364 lines
9.5 KiB
C
364 lines
9.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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multiple interface handling
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Copyright (C) Andrew Tridgell 1992-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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static struct iface_struct *probed_ifaces;
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static int total_probed;
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struct in_addr allones_ip;
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struct in_addr loopback_ip;
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static struct interface *local_interfaces;
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#define ALLONES ((uint32)0xFFFFFFFF)
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#define MKBCADDR(_IP, _NM) ((_IP & _NM) | (_NM ^ ALLONES))
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#define MKNETADDR(_IP, _NM) (_IP & _NM)
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/****************************************************************************
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Try and find an interface that matches an ip. If we cannot, return NULL
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**************************************************************************/
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static struct interface *iface_find(struct in_addr ip, BOOL CheckMask)
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{
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struct interface *i;
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if (is_zero_ip(ip)) return local_interfaces;
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for (i=local_interfaces;i;i=i->next)
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if (CheckMask) {
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if (same_net(i->ip,ip,i->nmask)) return i;
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} else if ((i->ip).s_addr == ip.s_addr) return i;
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return NULL;
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}
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/****************************************************************************
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add an interface to the linked list of interfaces
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****************************************************************************/
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static void add_interface(struct in_addr ip, struct in_addr nmask)
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{
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struct interface *iface;
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if (iface_find(ip, False)) {
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DEBUG(3,("not adding duplicate interface %s\n",inet_ntoa(ip)));
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return;
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}
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#if !defined(__s390__)
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if (ip_equal(nmask, allones_ip)) {
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DEBUG(3,("not adding non-broadcast interface %s\n",inet_ntoa(ip)));
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return;
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}
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#endif
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iface = SMB_MALLOC_P(struct interface);
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if (!iface) return;
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ZERO_STRUCTPN(iface);
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iface->ip = ip;
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iface->nmask = nmask;
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iface->bcast.s_addr = MKBCADDR(iface->ip.s_addr, iface->nmask.s_addr);
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DLIST_ADD(local_interfaces, iface);
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DEBUG(2,("added interface ip=%s ",inet_ntoa(iface->ip)));
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DEBUG(2,("bcast=%s ",inet_ntoa(iface->bcast)));
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DEBUG(2,("nmask=%s\n",inet_ntoa(iface->nmask)));
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}
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/****************************************************************************
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interpret a single element from a interfaces= config line
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This handles the following different forms:
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1) wildcard interface name
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2) DNS name
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3) IP/masklen
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4) ip/mask
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5) bcast/mask
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****************************************************************************/
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static void interpret_interface(char *token)
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{
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struct in_addr ip, nmask;
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char *p;
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int i, added=0;
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zero_ip(&ip);
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zero_ip(&nmask);
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/* first check if it is an interface name */
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for (i=0;i<total_probed;i++) {
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if (gen_fnmatch(token, probed_ifaces[i].name) == 0) {
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add_interface(probed_ifaces[i].iface_addr.ip,
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probed_ifaces[i].iface_netmask.netmask);
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added = 1;
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}
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}
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if (added) return;
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/* maybe it is a DNS name */
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p = strchr_m(token,'/');
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if (!p) {
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ip = *interpret_addr2(token);
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for (i=0;i<total_probed;i++) {
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if (ip.s_addr == probed_ifaces[i].iface_addr.ip.s_addr &&
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!ip_equal(allones_ip,
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probed_ifaces[i].iface_netmask.netmask)) {
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add_interface(probed_ifaces[i].iface_addr.ip,
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probed_ifaces[i].iface_netmask.netmask);
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return;
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}
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}
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DEBUG(2,("can't determine netmask for %s\n", token));
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return;
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}
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/* parse it into an IP address/netmasklength pair */
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*p = 0;
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ip = *interpret_addr2(token);
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*p++ = '/';
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if (strlen(p) > 2) {
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nmask = *interpret_addr2(p);
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} else {
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nmask.s_addr = htonl(((ALLONES >> atoi(p)) ^ ALLONES));
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}
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/* maybe the first component was a broadcast address */
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if (ip.s_addr == MKBCADDR(ip.s_addr, nmask.s_addr) ||
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ip.s_addr == MKNETADDR(ip.s_addr, nmask.s_addr)) {
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for (i=0;i<total_probed;i++) {
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if (same_net(ip, probed_ifaces[i].iface_addr.ip, nmask)) {
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add_interface(probed_ifaces[i].iface_addr.ip, nmask);
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return;
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}
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}
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DEBUG(2,("Can't determine ip for broadcast address %s\n", token));
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return;
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}
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add_interface(ip, nmask);
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}
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/****************************************************************************
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load the list of network interfaces
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****************************************************************************/
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void load_interfaces(void)
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{
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const char **ptr;
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int i;
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struct iface_struct ifaces[MAX_INTERFACES];
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ptr = lp_interfaces();
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allones_ip = *interpret_addr2("255.255.255.255");
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loopback_ip = *interpret_addr2("127.0.0.1");
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SAFE_FREE(probed_ifaces);
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/* dump the current interfaces if any */
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while (local_interfaces) {
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struct interface *iface = local_interfaces;
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DLIST_REMOVE(local_interfaces, local_interfaces);
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ZERO_STRUCTPN(iface);
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SAFE_FREE(iface);
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}
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/* probe the kernel for interfaces */
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total_probed = get_interfaces(ifaces, MAX_INTERFACES);
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if (total_probed > 0) {
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probed_ifaces = (struct iface_struct *)memdup(ifaces, sizeof(ifaces[0])*total_probed);
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if (!probed_ifaces) {
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DEBUG(0,("ERROR: memdup failed\n"));
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exit(1);
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}
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}
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/* if we don't have a interfaces line then use all broadcast capable
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interfaces except loopback */
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if (!ptr || !*ptr || !**ptr) {
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if (total_probed <= 0) {
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DEBUG(0,("ERROR: Could not determine network interfaces, you must use a interfaces config line\n"));
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exit(1);
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}
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for (i=0;i<total_probed;i++) {
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if (
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#if !defined(__s390__)
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probed_ifaces[i].iface_netmask.netmask.s_addr != allones_ip.s_addr &&
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#endif
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probed_ifaces[i].iface_addr.ip.s_addr != loopback_ip.s_addr) {
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add_interface(probed_ifaces[i].iface_addr.ip,
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probed_ifaces[i].iface_netmask.netmask);
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}
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}
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return;
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}
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if (ptr) {
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while (*ptr) {
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char *ptr_cpy = SMB_STRDUP(*ptr);
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if (ptr_cpy) {
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interpret_interface(ptr_cpy);
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free(ptr_cpy);
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}
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ptr++;
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}
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}
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if (!local_interfaces) {
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DEBUG(0,("WARNING: no network interfaces found\n"));
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}
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}
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void gfree_interfaces(void)
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{
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while (local_interfaces) {
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struct interface *iface = local_interfaces;
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DLIST_REMOVE(local_interfaces, local_interfaces);
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ZERO_STRUCTPN(iface);
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SAFE_FREE(iface);
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}
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SAFE_FREE(probed_ifaces);
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}
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/****************************************************************************
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return True if the list of probed interfaces has changed
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****************************************************************************/
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BOOL interfaces_changed(void)
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{
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int n;
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struct iface_struct ifaces[MAX_INTERFACES];
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n = get_interfaces(ifaces, MAX_INTERFACES);
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if ((n > 0 )&& (n != total_probed ||
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memcmp(ifaces, probed_ifaces, sizeof(ifaces[0])*n))) {
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return True;
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}
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return False;
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}
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/****************************************************************************
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check if an IP is one of mine
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**************************************************************************/
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BOOL ismyip(struct in_addr ip)
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{
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struct interface *i;
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for (i=local_interfaces;i;i=i->next)
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if (ip_equal(i->ip,ip)) return True;
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return False;
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}
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/****************************************************************************
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check if a packet is from a local (known) net
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**************************************************************************/
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BOOL is_local_net(struct in_addr from)
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{
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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if((from.s_addr & i->nmask.s_addr) ==
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(i->ip.s_addr & i->nmask.s_addr))
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return True;
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}
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return False;
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}
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/****************************************************************************
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how many interfaces do we have
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**************************************************************************/
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int iface_count(void)
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{
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int ret = 0;
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struct interface *i;
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for (i=local_interfaces;i;i=i->next)
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ret++;
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return ret;
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}
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/****************************************************************************
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return the Nth interface
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**************************************************************************/
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struct interface *get_interface(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) return i;
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return NULL;
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}
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/****************************************************************************
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return IP of the Nth interface
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**************************************************************************/
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struct in_addr *iface_n_ip(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) return &i->ip;
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return NULL;
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}
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/****************************************************************************
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return bcast of the Nth interface
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**************************************************************************/
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struct in_addr *iface_n_bcast(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) return &i->bcast;
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return NULL;
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}
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/* these 3 functions return the ip/bcast/nmask for the interface
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most appropriate for the given ip address. If they can't find
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an appropriate interface they return the requested field of the
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first known interface. */
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struct in_addr *iface_ip(struct in_addr ip)
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{
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struct interface *i = iface_find(ip, True);
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return(i ? &i->ip : &local_interfaces->ip);
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}
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/*
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return True if a IP is directly reachable on one of our interfaces
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*/
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BOOL iface_local(struct in_addr ip)
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{
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return iface_find(ip, True) ? True : False;
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}
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