mirror of
https://github.com/samba-team/samba.git
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0329d755a7
* Move dlinklist.h, smb.h to subsystem-specific directories
* Clean up ads.h and move what is left of it to dsdb/
(only place where it's used)
(This used to be commit f7afa1cb77
)
355 lines
7.7 KiB
C
355 lines
7.7 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 1992-2005
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "system/network.h"
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#include "lib/socket/netif.h"
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#include "lib/util/dlinklist.h"
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/** used for network interfaces */
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struct interface {
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struct interface *next, *prev;
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struct ipv4_addr ip;
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struct ipv4_addr nmask;
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const char *ip_s;
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const char *bcast_s;
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const char *nmask_s;
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};
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static struct interface *local_interfaces;
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#define ALLONES ((uint32_t)0xFFFFFFFF)
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/*
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address construction based on a patch from fred@datalync.com
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*/
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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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static struct ipv4_addr tov4(struct in_addr in)
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{
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struct ipv4_addr in2;
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in2.addr = in.s_addr;
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return in2;
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}
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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(tov4(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,tov4(ip),i->nmask)) return i;
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} else if (i->ip.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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struct ipv4_addr bcast;
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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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iface = talloc(local_interfaces, struct interface);
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if (!iface) return;
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ZERO_STRUCTPN(iface);
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iface->ip = tov4(ip);
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iface->nmask = tov4(nmask);
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bcast.addr = MKBCADDR(iface->ip.addr, iface->nmask.addr);
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/* keep string versions too, to avoid people tripping over the implied
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static in sys_inet_ntoa() */
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iface->ip_s = talloc_strdup(iface, sys_inet_ntoa(iface->ip));
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iface->nmask_s = talloc_strdup(iface, sys_inet_ntoa(iface->nmask));
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if (nmask.s_addr != ~0) {
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iface->bcast_s = talloc_strdup(iface, sys_inet_ntoa(bcast));
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}
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DLIST_ADD_END(local_interfaces, iface, struct interface *);
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DEBUG(2,("added interface ip=%s nmask=%s\n", iface->ip_s, iface->nmask_s));
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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(const char *token,
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struct iface_struct *probed_ifaces,
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int total_probed)
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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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ip.s_addr = 0;
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nmask.s_addr = 0;
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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].ip,
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probed_ifaces[i].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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/* don't try to do dns lookups on wildcard names */
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if (strpbrk(token, "*?") != NULL) {
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return;
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}
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ip.s_addr = interpret_addr2(token).addr;
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for (i=0;i<total_probed;i++) {
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if (ip.s_addr == probed_ifaces[i].ip.s_addr) {
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add_interface(probed_ifaces[i].ip,
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probed_ifaces[i].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.s_addr = interpret_addr2(token).addr;
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if (strlen(p) > 2) {
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nmask.s_addr = interpret_addr2(p).addr;
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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(tov4(ip), tov4(probed_ifaces[i].ip), tov4(nmask))) {
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add_interface(probed_ifaces[i].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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static 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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struct ipv4_addr loopback_ip;
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int total_probed;
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if (local_interfaces != NULL) {
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return;
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}
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ptr = lp_interfaces();
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loopback_ip = interpret_addr2("127.0.0.1");
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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 we don't have a interfaces line then use all interfaces
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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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}
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for (i=0;i<total_probed;i++) {
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if (ifaces[i].ip.s_addr != loopback_ip.addr) {
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add_interface(ifaces[i].ip,
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ifaces[i].netmask);
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}
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}
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}
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while (ptr && *ptr) {
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interpret_interface(*ptr, ifaces, total_probed);
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ptr++;
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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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/**
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unload the interfaces list, so it can be reloaded when needed
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*/
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void unload_interfaces(void)
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{
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talloc_free(local_interfaces);
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local_interfaces = NULL;
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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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load_interfaces();
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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 IP of the Nth interface
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**/
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const char *iface_n_ip(int n)
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{
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struct interface *i;
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load_interfaces();
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) {
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return i->ip_s;
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}
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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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const char *iface_n_bcast(int n)
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{
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struct interface *i;
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load_interfaces();
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) {
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return i->bcast_s;
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}
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return NULL;
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}
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/**
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return netmask of the Nth interface
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**/
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const char *iface_n_netmask(int n)
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{
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struct interface *i;
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load_interfaces();
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for (i=local_interfaces;i && n;i=i->next)
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n--;
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if (i) {
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return i->nmask_s;
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}
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return NULL;
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}
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/**
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return the local IP address that best matches a destination IP, or
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our first interface if none match
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*/
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const char *iface_best_ip(const char *dest)
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{
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struct interface *iface;
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struct in_addr ip;
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load_interfaces();
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ip.s_addr = interpret_addr(dest);
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iface = iface_find(ip, True);
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if (iface) {
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return iface->ip_s;
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}
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return iface_n_ip(0);
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}
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/**
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return True if an IP is one one of our local networks
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*/
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BOOL iface_is_local(const char *dest)
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{
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struct in_addr ip;
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load_interfaces();
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ip.s_addr = interpret_addr(dest);
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if (iface_find(ip, True)) {
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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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return True if a IP matches a IP/netmask pair
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*/
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BOOL iface_same_net(const char *ip1, const char *ip2, const char *netmask)
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{
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return same_net(interpret_addr2(ip1),
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interpret_addr2(ip2),
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interpret_addr2(netmask));
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}
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