/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
multiple interface handling
Copyright (C) Andrew Tridgell 1992-1998
This program 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
#include "includes.h"
-extern int DEBUGLEVEL;
+static struct iface_struct *probed_ifaces;
+static int total_probed;
-struct in_addr ipzero;
struct in_addr allones_ip;
struct in_addr loopback_ip;
-static struct in_addr default_ip;
-static struct in_addr default_bcast;
-static struct in_addr default_nmask;
-static BOOL got_ip=False;
-static BOOL got_bcast=False;
-static BOOL got_nmask=False;
-static struct interface *local_interfaces = NULL;
-
-struct interface *last_iface;
+static struct interface *local_interfaces;
#define ALLONES ((uint32)0xFFFFFFFF)
#define MKBCADDR(_IP, _NM) ((_IP & _NM) | (_NM ^ ALLONES))
+#define MKNETADDR(_IP, _NM) (_IP & _NM)
+
/****************************************************************************
-calculate the default netmask for an address
-****************************************************************************/
-static void default_netmask(struct in_addr *inm, struct in_addr *iad)
+Try and find an interface that matches an ip. If we cannot, return NULL
+ **************************************************************************/
+static struct interface *iface_find(struct in_addr ip, BOOL CheckMask)
{
- /*
- ** Guess a netmask based on the class of the IP address given.
- */
- switch((ntohl(iad->s_addr) & 0xE0000000)) {
- case 0x00000000: /* Class A addr */
- case 0x20000000:
- case 0x40000000:
- case 0x60000000:
- inm->s_addr = htonl(0xFF000000);
- break;
-
- case 0x80000000: /* Class B addr */
- case 0xA0000000:
- inm->s_addr = htonl(0xFFFF0000);
- break;
-
- case 0xC0000000: /* Class C addr */
- inm->s_addr = htonl(0xFFFFFF00);
- break;
-
- default: /* ??? */
- inm->s_addr = htonl(0xFFFFFFF0);
- }
+ struct interface *i;
+ if (is_zero_ip(ip)) return local_interfaces;
+
+ for (i=local_interfaces;i;i=i->next)
+ if (CheckMask) {
+ if (same_net(i->ip,ip,i->nmask)) return i;
+ } else if ((i->ip).s_addr == ip.s_addr) return i;
+
+ return NULL;
}
/****************************************************************************
- get the broadcast address for our address
-(troyer@saifr00.ateng.az.honeywell.com)
+add an interface to the linked list of interfaces
****************************************************************************/
-static void get_broadcast(struct in_addr *if_ipaddr,
- struct in_addr *if_bcast,
- struct in_addr *if_nmask)
-{
- uint32 nm;
- short onbc;
- short offbc;
-
- /* get a default netmask and broadcast */
- default_netmask(if_nmask, if_ipaddr);
-
- get_netmask(if_ipaddr, if_nmask);
-
- /* sanity check on the netmask */
- nm = ntohl(if_nmask->s_addr);
- onbc = 0;
- offbc = 0;
- while((onbc + offbc) < 32) {
- if(nm & 0x80000000) {
- onbc++;
- if(offbc) {
- /* already found an off bit, so mask
- is wrong */
- onbc = 34;
- }
- } else {
- offbc++;
- }
- nm <<= 1;
+static void add_interface(struct in_addr ip, struct in_addr nmask)
+{
+ struct interface *iface;
+ if (iface_find(ip, False)) {
+ DEBUG(3,("not adding duplicate interface %s\n",inet_ntoa(ip)));
+ return;
}
- if ((onbc < 8)||(onbc == 34)) {
- DEBUG(0,("Impossible netmask %s - using defaults\n",
- inet_ntoa(*if_nmask)));
- default_netmask(if_nmask, if_ipaddr);
+
+#if !defined(__s390__)
+ if (ip_equal(nmask, allones_ip)) {
+ DEBUG(3,("not adding non-broadcast interface %s\n",inet_ntoa(ip)));
+ return;
}
+#endif
- /* derive the broadcast assuming a 1's broadcast, as this is what
- all MS operating systems do, we have to comply even if the unix
- box is setup differently */
- if_bcast->s_addr = MKBCADDR(if_ipaddr->s_addr, if_nmask->s_addr);
-
- DEBUG(4,("Derived broadcast address %s\n", inet_ntoa(*if_bcast)));
+ iface = SMB_MALLOC_P(struct interface);
+ if (!iface) return;
+
+ ZERO_STRUCTPN(iface);
+
+ iface->ip = ip;
+ iface->nmask = nmask;
+ iface->bcast.s_addr = MKBCADDR(iface->ip.s_addr, iface->nmask.s_addr);
+
+ DLIST_ADD(local_interfaces, iface);
+
+ DEBUG(2,("added interface ip=%s ",inet_ntoa(iface->ip)));
+ DEBUG(2,("bcast=%s ",inet_ntoa(iface->bcast)));
+ DEBUG(2,("nmask=%s\n",inet_ntoa(iface->nmask)));
}
/****************************************************************************
-load a list of network interfaces
+interpret a single element from a interfaces= config line
+
+This handles the following different forms:
+
+1) wildcard interface name
+2) DNS name
+3) IP/masklen
+4) ip/mask
+5) bcast/mask
****************************************************************************/
-static void interpret_interfaces(char *s, struct interface **interfaces,
- char *description)
+static void interpret_interface(char *token)
{
- char *ptr;
- fstring token;
- struct interface *iface;
- struct in_addr ip;
-
- ptr = s;
- ipzero = *interpret_addr2("0.0.0.0");
- allones_ip = *interpret_addr2("255.255.255.255");
- loopback_ip = *interpret_addr2("127.0.0.1");
-
- while (next_token(&ptr,token,NULL,sizeof(token))) {
- /* parse it into an IP address/netmasklength pair */
- char *p = strchr(token,'/');
- if (p) *p++ = 0;
-
- ip = *interpret_addr2(token);
-
- /* maybe we already have it listed */
- {
- struct interface *i;
- for (i=(*interfaces);i;i=i->next)
- if (ip_equal(ip,i->ip)) break;
- if (i) continue;
- }
-
- iface = (struct interface *)malloc(sizeof(*iface));
- if (!iface) return;
-
- iface->ip = ip;
-
- if (p) {
- if (strlen(p) > 2)
- iface->nmask = *interpret_addr2(p);
- else
- iface->nmask.s_addr = htonl(((ALLONES >> atoi(p)) ^ ALLONES));
- } else {
- default_netmask(&iface->nmask,&iface->ip);
- }
- iface->bcast.s_addr = MKBCADDR(iface->ip.s_addr, iface->nmask.s_addr);
- iface->next = NULL;
-
- if (!(*interfaces)) {
- (*interfaces) = iface;
- } else {
- last_iface->next = iface;
- }
- last_iface = iface;
- DEBUG(2,("Added %s ip=%s ",description,inet_ntoa(iface->ip)));
- DEBUG(2,("bcast=%s ",inet_ntoa(iface->bcast)));
- DEBUG(2,("nmask=%s\n",inet_ntoa(iface->nmask)));
- }
-
- if (*interfaces) return;
-
- /* setup a default interface */
- iface = (struct interface *)malloc(sizeof(*iface));
- if (!iface) return;
-
- iface->next = NULL;
-
- if (got_ip) {
- iface->ip = default_ip;
- } else {
- get_myname(NULL,&iface->ip);
- }
-
- if (got_bcast) {
- iface->bcast = default_bcast;
- } else {
- get_broadcast(&iface->ip,&iface->bcast,&iface->nmask);
- }
-
- if (got_nmask) {
- iface->nmask = default_nmask;
- iface->bcast.s_addr = MKBCADDR(iface->ip.s_addr, iface->nmask.s_addr);
- }
-
- if (iface->bcast.s_addr != MKBCADDR(iface->ip.s_addr, iface->nmask.s_addr)) {
- DEBUG(2,("Warning: inconsistant interface %s\n",inet_ntoa(iface->ip)));
- }
-
- iface->next = NULL;
- (*interfaces) = last_iface = iface;
-
- DEBUG(2,("Added interface ip=%s ",inet_ntoa(iface->ip)));
- DEBUG(2,("bcast=%s ",inet_ntoa(iface->bcast)));
- DEBUG(2,("nmask=%s\n",inet_ntoa(iface->nmask)));
+ struct in_addr ip, nmask;
+ char *p;
+ int i, added=0;
+
+ zero_ip(&ip);
+ zero_ip(&nmask);
+
+ /* first check if it is an interface name */
+ for (i=0;i<total_probed;i++) {
+ if (gen_fnmatch(token, probed_ifaces[i].name) == 0) {
+ add_interface(probed_ifaces[i].ip,
+ probed_ifaces[i].netmask);
+ added = 1;
+ }
+ }
+ if (added) return;
+
+ /* maybe it is a DNS name */
+ p = strchr_m(token,'/');
+ if (!p) {
+ ip = *interpret_addr2(token);
+ for (i=0;i<total_probed;i++) {
+ if (ip.s_addr == probed_ifaces[i].ip.s_addr &&
+ !ip_equal(allones_ip, probed_ifaces[i].netmask)) {
+ add_interface(probed_ifaces[i].ip,
+ probed_ifaces[i].netmask);
+ return;
+ }
+ }
+ DEBUG(2,("can't determine netmask for %s\n", token));
+ return;
+ }
+
+ /* parse it into an IP address/netmasklength pair */
+ *p = 0;
+ ip = *interpret_addr2(token);
+ *p++ = '/';
+
+ if (strlen(p) > 2) {
+ nmask = *interpret_addr2(p);
+ } else {
+ nmask.s_addr = htonl(((ALLONES >> atoi(p)) ^ ALLONES));
+ }
+
+ /* maybe the first component was a broadcast address */
+ if (ip.s_addr == MKBCADDR(ip.s_addr, nmask.s_addr) ||
+ ip.s_addr == MKNETADDR(ip.s_addr, nmask.s_addr)) {
+ for (i=0;i<total_probed;i++) {
+ if (same_net(ip, probed_ifaces[i].ip, nmask)) {
+ add_interface(probed_ifaces[i].ip, nmask);
+ return;
+ }
+ }
+ DEBUG(2,("Can't determine ip for broadcast address %s\n", token));
+ return;
+ }
+
+ add_interface(ip, nmask);
}
/****************************************************************************
-load the remote and local interfaces
+load the list of network interfaces
****************************************************************************/
void load_interfaces(void)
{
- /* add the machine's interfaces to local interface structure*/
- interpret_interfaces(lp_interfaces(), &local_interfaces,"interface");
+ const char **ptr;
+ int i;
+ struct iface_struct ifaces[MAX_INTERFACES];
+
+ ptr = lp_interfaces();
+
+ allones_ip = *interpret_addr2("255.255.255.255");
+ loopback_ip = *interpret_addr2("127.0.0.1");
+
+ SAFE_FREE(probed_ifaces);
+
+ /* dump the current interfaces if any */
+ while (local_interfaces) {
+ struct interface *iface = local_interfaces;
+ DLIST_REMOVE(local_interfaces, local_interfaces);
+ ZERO_STRUCTPN(iface);
+ SAFE_FREE(iface);
+ }
+
+ /* probe the kernel for interfaces */
+ total_probed = get_interfaces(ifaces, MAX_INTERFACES);
+
+ if (total_probed > 0) {
+ probed_ifaces = (struct iface_struct *)memdup(ifaces, sizeof(ifaces[0])*total_probed);
+ if (!probed_ifaces) {
+ DEBUG(0,("ERROR: memdup failed\n"));
+ exit(1);
+ }
+ }
+
+ /* if we don't have a interfaces line then use all broadcast capable
+ interfaces except loopback */
+ if (!ptr || !*ptr || !**ptr) {
+ if (total_probed <= 0) {
+ DEBUG(0,("ERROR: Could not determine network interfaces, you must use a interfaces config line\n"));
+ exit(1);
+ }
+ for (i=0;i<total_probed;i++) {
+ if (
+#if !defined(__s390__)
+ probed_ifaces[i].netmask.s_addr != allones_ip.s_addr &&
+#endif
+ probed_ifaces[i].ip.s_addr != loopback_ip.s_addr) {
+ add_interface(probed_ifaces[i].ip,
+ probed_ifaces[i].netmask);
+ }
+ }
+ return;
+ }
+
+ if (ptr) {
+ while (*ptr) {
+ char *ptr_cpy = SMB_STRDUP(*ptr);
+ if (ptr_cpy) {
+ interpret_interface(ptr_cpy);
+ free(ptr_cpy);
+ }
+ ptr++;
+ }
+ }
+
+ if (!local_interfaces) {
+ DEBUG(0,("WARNING: no network interfaces found\n"));
+ }
}
-/****************************************************************************
- override the defaults
- **************************************************************************/
-void iface_set_default(char *ip,char *bcast,char *nmask)
+void gfree_interfaces(void)
{
- if (ip) {
- got_ip = True;
- default_ip = *interpret_addr2(ip);
- }
-
- if (bcast) {
- got_bcast = True;
- default_bcast = *interpret_addr2(bcast);
- }
-
- if (nmask) {
- got_nmask = True;
- default_nmask = *interpret_addr2(nmask);
- }
-}
+ while (local_interfaces) {
+ struct interface *iface = local_interfaces;
+ DLIST_REMOVE(local_interfaces, local_interfaces);
+ ZERO_STRUCTPN(iface);
+ SAFE_FREE(iface);
+ }
+ SAFE_FREE(probed_ifaces);
+}
/****************************************************************************
- check if an IP is one of mine
- **************************************************************************/
-BOOL ismyip(struct in_addr ip)
+return True if the list of probed interfaces has changed
+****************************************************************************/
+BOOL interfaces_changed(void)
{
- struct interface *i;
- for (i=local_interfaces;i;i=i->next)
- if (ip_equal(i->ip,ip)) return True;
- return False;
+ int n;
+ struct iface_struct ifaces[MAX_INTERFACES];
+
+ n = get_interfaces(ifaces, MAX_INTERFACES);
+
+ if ((n > 0 )&& (n != total_probed ||
+ memcmp(ifaces, probed_ifaces, sizeof(ifaces[0])*n))) {
+ return True;
+ }
+
+ return False;
}
+
/****************************************************************************
- check if a bcast is one of mine
+ check if an IP is one of mine
**************************************************************************/
-BOOL ismybcast(struct in_addr bcast)
+BOOL ismyip(struct in_addr ip)
{
- struct interface *i;
- for (i=local_interfaces;i;i=i->next)
- if (ip_equal(i->bcast,bcast)) return True;
- return False;
+ struct interface *i;
+ for (i=local_interfaces;i;i=i->next)
+ if (ip_equal(i->ip,ip)) return True;
+ return False;
}
/****************************************************************************
**************************************************************************/
BOOL is_local_net(struct in_addr from)
{
- struct interface *i;
- for (i=local_interfaces;i;i=i->next)
- if((from.s_addr & i->nmask.s_addr) == (i->ip.s_addr & i->nmask.s_addr))
- return True;
- return False;
+ struct interface *i;
+ for (i=local_interfaces;i;i=i->next) {
+ if((from.s_addr & i->nmask.s_addr) ==
+ (i->ip.s_addr & i->nmask.s_addr))
+ return True;
+ }
+ return False;
}
/****************************************************************************
**************************************************************************/
int iface_count(void)
{
- int ret = 0;
- struct interface *i;
-
- for (i=local_interfaces;i;i=i->next)
- ret++;
- return ret;
-}
-
-/****************************************************************************
- True if we have two or more interfaces.
- **************************************************************************/
-BOOL we_are_multihomed(void)
-{
- static int multi = -1;
-
- if(multi == -1)
- multi = (iface_count() > 1 ? True : False);
+ int ret = 0;
+ struct interface *i;
- return multi;
+ for (i=local_interfaces;i;i=i->next)
+ ret++;
+ return ret;
}
/****************************************************************************
**************************************************************************/
struct interface *get_interface(int n)
{
- struct interface *i;
+ struct interface *i;
- for (i=local_interfaces;i && n;i=i->next)
- n--;
+ for (i=local_interfaces;i && n;i=i->next)
+ n--;
- if (i) return i;
- return NULL;
+ if (i) return i;
+ return NULL;
}
/****************************************************************************
**************************************************************************/
struct in_addr *iface_n_ip(int n)
{
- struct interface *i;
+ struct interface *i;
- for (i=local_interfaces;i && n;i=i->next)
- n--;
+ for (i=local_interfaces;i && n;i=i->next)
+ n--;
- if (i) return &i->ip;
- return NULL;
+ if (i) return &i->ip;
+ return NULL;
}
/****************************************************************************
-Try and find an interface that matches an ip. If we cannot, return NULL
+ return bcast of the Nth interface
**************************************************************************/
-static struct interface *iface_find(struct in_addr ip)
+struct in_addr *iface_n_bcast(int n)
{
- struct interface *i;
- if (zero_ip(ip)) return local_interfaces;
-
- for (i=local_interfaces;i;i=i->next)
- if (same_net(i->ip,ip,i->nmask)) return i;
-
- return NULL;
-}
-
-
-/****************************************************************************
-this function provides a simple hash of the configured interfaces. It is
-used to detect a change in interfaces to tell us whether to discard
-the current wins.dat file.
-Note that the result is independent of the order of the interfaces
- **************************************************************************/
-unsigned iface_hash(void)
-{
- unsigned ret = 0;
struct interface *i;
+
+ for (i=local_interfaces;i && n;i=i->next)
+ n--;
- for (i=local_interfaces;i;i=i->next) {
- unsigned x1 = (unsigned)str_checksum(inet_ntoa(i->ip));
- unsigned x2 = (unsigned)str_checksum(inet_ntoa(i->nmask));
- ret ^= (x1 ^ x2);
- }
-
- return ret;
+ if (i) return &i->bcast;
+ return NULL;
}
an appropriate interface they return the requested field of the
first known interface. */
-struct in_addr *iface_bcast(struct in_addr ip)
-{
- struct interface *i = iface_find(ip);
- return(i ? &i->bcast : &local_interfaces->bcast);
-}
-
-struct in_addr *iface_nmask(struct in_addr ip)
+struct in_addr *iface_ip(struct in_addr ip)
{
- struct interface *i = iface_find(ip);
- return(i ? &i->nmask : &local_interfaces->nmask);
+ struct interface *i = iface_find(ip, True);
+ return(i ? &i->ip : &local_interfaces->ip);
}
-struct in_addr *iface_ip(struct in_addr ip)
+/*
+ return True if a IP is directly reachable on one of our interfaces
+*/
+BOOL iface_local(struct in_addr ip)
{
- struct interface *i = iface_find(ip);
- return(i ? &i->ip : &local_interfaces->ip);
+ return iface_find(ip, True) ? True : False;
}
-
-
-
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