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-rw-r--r--source4/lib/socket/interface.c525
1 files changed, 525 insertions, 0 deletions
diff --git a/source4/lib/socket/interface.c b/source4/lib/socket/interface.c
new file mode 100644
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--- /dev/null
+++ b/source4/lib/socket/interface.c
@@ -0,0 +1,525 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ multiple interface handling
+
+ Copyright (C) Andrew Tridgell 1992-2005
+
+ 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 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "param/param.h"
+#include "lib/socket/netif.h"
+#include "../lib/util/util_net.h"
+#include "../lib/util/dlinklist.h"
+#include "lib/util/smb_strtox.h"
+
+/* used for network interfaces */
+struct interface {
+ struct interface *next, *prev;
+ char *name;
+ int flags;
+ struct sockaddr_storage ip;
+ struct sockaddr_storage netmask;
+ struct sockaddr_storage bcast;
+ const char *ip_s;
+ const char *bcast_s;
+ const char *nmask_s;
+};
+
+#define ALLONES ((uint32_t)0xFFFFFFFF)
+/*
+ address construction based on a patch from fred@datalync.com
+*/
+#define MKBCADDR(_IP, _NM) ((_IP & _NM) | (_NM ^ ALLONES))
+#define MKNETADDR(_IP, _NM) (_IP & _NM)
+
+/****************************************************************************
+Try and find an interface that matches an ip. If we cannot, return NULL
+ **************************************************************************/
+static struct interface *iface_list_find(struct interface *interfaces,
+ const struct sockaddr *ip,
+ bool check_mask)
+{
+ struct interface *i;
+
+ if (is_address_any(ip)) {
+ return interfaces;
+ }
+
+ for (i=interfaces;i;i=i->next) {
+ if (check_mask) {
+ if (same_net(ip, (struct sockaddr *)&i->ip, (struct sockaddr *)&i->netmask)) {
+ return i;
+ }
+ } else if (sockaddr_equal((struct sockaddr *)&i->ip, ip)) {
+ return i;
+ }
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+add an interface to the linked list of interfaces
+****************************************************************************/
+static void add_interface(TALLOC_CTX *mem_ctx, const struct iface_struct *ifs, struct interface **interfaces)
+{
+ char addr[INET6_ADDRSTRLEN];
+ struct interface *iface;
+
+ if (iface_list_find(*interfaces, (const struct sockaddr *)&ifs->ip, false)) {
+ DEBUG(3,("add_interface: not adding duplicate interface %s\n",
+ print_sockaddr(addr, sizeof(addr), &ifs->ip) ));
+ return;
+ }
+
+ if (ifs->ip.ss_family == AF_INET &&
+ !(ifs->flags & (IFF_BROADCAST|IFF_LOOPBACK))) {
+ DEBUG(3,("not adding non-broadcast interface %s\n",
+ ifs->name ));
+ return;
+ }
+
+ if (*interfaces != NULL) {
+ mem_ctx = *interfaces;
+ }
+
+ iface = talloc_zero(mem_ctx, struct interface);
+ if (iface == NULL) {
+ return;
+ }
+
+ iface->name = talloc_strdup(iface, ifs->name);
+ if (!iface->name) {
+ SAFE_FREE(iface);
+ return;
+ }
+ iface->flags = ifs->flags;
+ iface->ip = ifs->ip;
+ iface->netmask = ifs->netmask;
+ iface->bcast = ifs->bcast;
+
+ /* keep string versions too, to avoid people tripping over the implied
+ static in inet_ntoa() */
+ print_sockaddr(addr, sizeof(addr), &iface->ip);
+ DEBUG(4,("added interface %s ip=%s ",
+ iface->name, addr));
+ iface->ip_s = talloc_strdup(iface, addr);
+
+ print_sockaddr(addr, sizeof(addr),
+ &iface->bcast);
+ DEBUG(4,("bcast=%s ", addr));
+ iface->bcast_s = talloc_strdup(iface, addr);
+
+ print_sockaddr(addr, sizeof(addr),
+ &iface->netmask);
+ DEBUG(4,("netmask=%s\n", addr));
+ iface->nmask_s = talloc_strdup(iface, addr);
+
+ /*
+ this needs to be a ADD_END, as some tests (such as the
+ spoolss notify test) depend on the interfaces ordering
+ */
+ DLIST_ADD_END(*interfaces, iface);
+}
+
+/**
+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_interface(TALLOC_CTX *mem_ctx,
+ const char *token,
+ struct iface_struct *probed_ifaces,
+ int total_probed,
+ struct interface **local_interfaces)
+{
+ struct sockaddr_storage ss;
+ struct sockaddr_storage ss_mask;
+ struct sockaddr_storage ss_net;
+ struct sockaddr_storage ss_bcast;
+ struct iface_struct ifs;
+ char *p;
+ int i;
+ bool added=false;
+ bool goodaddr = false;
+
+ /* 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(mem_ctx, &probed_ifaces[i],
+ local_interfaces);
+ added = true;
+ }
+ }
+ if (added) {
+ return;
+ }
+
+ p = strchr_m(token, ';');
+ if (p != NULL) {
+ /*
+ * skip smbd-specific extra data:
+ * link speed, capabilities, and interface index
+ */
+ *p = 0;
+ }
+
+ /* maybe it is a DNS name */
+ p = strchr_m(token,'/');
+ if (p == NULL) {
+ if (!interpret_string_addr(&ss, token, 0)) {
+ DEBUG(2, ("interpret_interface: Can't find address "
+ "for %s\n", token));
+ return;
+ }
+
+ for (i=0;i<total_probed;i++) {
+ if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&probed_ifaces[i].ip)) {
+ add_interface(mem_ctx, &probed_ifaces[i],
+ local_interfaces);
+ return;
+ }
+ }
+ DEBUG(2,("interpret_interface: "
+ "can't determine interface for %s\n",
+ token));
+ return;
+ }
+
+ /* parse it into an IP address/netmasklength pair */
+ *p = 0;
+ goodaddr = interpret_string_addr(&ss, token, 0);
+ *p++ = '/';
+
+ if (!goodaddr) {
+ DEBUG(2,("interpret_interface: "
+ "can't determine interface for %s\n",
+ token));
+ return;
+ }
+
+ if (strlen(p) > 2) {
+ goodaddr = interpret_string_addr(&ss_mask, p, 0);
+ if (!goodaddr) {
+ DEBUG(2,("interpret_interface: "
+ "can't determine netmask from %s\n",
+ p));
+ return;
+ }
+ } else {
+ int error = 0;
+
+ unsigned long val = smb_strtoul(p,
+ NULL,
+ 0,
+ &error,
+ SMB_STR_FULL_STR_CONV);
+ if (error != 0) {
+ DEBUG(2,("interpret_interface: "
+ "can't determine netmask value from %s\n",
+ p));
+ return;
+ }
+ if (!make_netmask(&ss_mask, &ss, val)) {
+ DEBUG(2,("interpret_interface: "
+ "can't apply netmask value %lu from %s\n",
+ val,
+ p));
+ return;
+ }
+ }
+
+ make_bcast(&ss_bcast, &ss, &ss_mask);
+ make_net(&ss_net, &ss, &ss_mask);
+
+ /* Maybe the first component was a broadcast address. */
+ if (sockaddr_equal((struct sockaddr *)&ss_bcast, (struct sockaddr *)&ss) ||
+ sockaddr_equal((struct sockaddr *)&ss_net, (struct sockaddr *)&ss)) {
+ for (i=0;i<total_probed;i++) {
+ if (same_net((struct sockaddr *)&ss,
+ (struct sockaddr *)&probed_ifaces[i].ip,
+ (struct sockaddr *)&ss_mask)) {
+ /* Temporarily replace netmask on
+ * the detected interface - user knows
+ * best.... */
+ struct sockaddr_storage saved_mask =
+ probed_ifaces[i].netmask;
+ probed_ifaces[i].netmask = ss_mask;
+ DEBUG(2,("interpret_interface: "
+ "using netmask value %s from "
+ "config file on interface %s\n",
+ p,
+ probed_ifaces[i].name));
+ add_interface(mem_ctx, &probed_ifaces[i],
+ local_interfaces);
+ probed_ifaces[i].netmask = saved_mask;
+ return;
+ }
+ }
+ DEBUG(2,("interpret_interface: Can't determine ip for "
+ "broadcast address %s\n",
+ token));
+ return;
+ }
+
+ /* Just fake up the interface definition. User knows best. */
+
+ DEBUG(2,("interpret_interface: Adding interface %s\n",
+ token));
+
+ ZERO_STRUCT(ifs);
+ (void)strlcpy(ifs.name, token, sizeof(ifs.name));
+ ifs.flags = IFF_BROADCAST;
+ ifs.ip = ss;
+ ifs.netmask = ss_mask;
+ ifs.bcast = ss_bcast;
+ add_interface(mem_ctx, &ifs, local_interfaces);
+}
+
+
+/**
+load the list of network interfaces
+**/
+void load_interface_list(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, struct interface **local_interfaces)
+{
+ const char **ptr = lpcfg_interfaces(lp_ctx);
+ int i;
+ struct iface_struct *ifaces = NULL;
+ int total_probed;
+
+ *local_interfaces = NULL;
+
+ /* probe the kernel for interfaces */
+ total_probed = get_interfaces(mem_ctx, &ifaces);
+
+ /* if we don't have a interfaces line then use all 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"));
+ }
+ for (i=0;i<total_probed;i++) {
+ if (!is_loopback_addr((struct sockaddr *)&ifaces[i].ip)) {
+ add_interface(mem_ctx, &ifaces[i], local_interfaces);
+ }
+ }
+ }
+
+ while (ptr && *ptr) {
+ interpret_interface(mem_ctx, *ptr, ifaces, total_probed, local_interfaces);
+ ptr++;
+ }
+
+ if (!*local_interfaces) {
+ DEBUG(0,("WARNING: no network interfaces found\n"));
+ }
+ talloc_free(ifaces);
+}
+
+/**
+ how many interfaces do we have
+ **/
+int iface_list_count(struct interface *ifaces)
+{
+ int ret = 0;
+ struct interface *i;
+
+ for (i=ifaces;i;i=i->next)
+ ret++;
+ return ret;
+}
+
+/**
+ return IP of the Nth interface
+ **/
+const char *iface_list_n_ip(struct interface *ifaces, int n)
+{
+ struct interface *i;
+
+ for (i=ifaces;i && n;i=i->next)
+ n--;
+
+ if (i) {
+ return i->ip_s;
+ }
+ return NULL;
+}
+
+
+/**
+ return the first IPv4 interface address we have registered
+ **/
+const char *iface_list_first_v4(struct interface *ifaces)
+{
+ struct interface *i;
+
+ for (i=ifaces; i; i=i->next) {
+ if (i->ip.ss_family == AF_INET) {
+ return i->ip_s;
+ }
+ }
+ return NULL;
+}
+
+/**
+ return the first IPv6 interface address we have registered
+ **/
+static const char *iface_list_first_v6(struct interface *ifaces)
+{
+ struct interface *i;
+
+#ifdef HAVE_IPV6
+ for (i=ifaces; i; i=i->next) {
+ if (i->ip.ss_family == AF_INET6) {
+ return i->ip_s;
+ }
+ }
+#endif
+ return NULL;
+}
+
+/**
+ check if an interface is IPv4
+ **/
+bool iface_list_n_is_v4(struct interface *ifaces, int n)
+{
+ struct interface *i;
+
+ for (i=ifaces;i && n;i=i->next)
+ n--;
+
+ if (i) {
+ return i->ip.ss_family == AF_INET;
+ }
+ return false;
+}
+
+/**
+ return bcast of the Nth interface
+ **/
+const char *iface_list_n_bcast(struct interface *ifaces, int n)
+{
+ struct interface *i;
+
+ for (i=ifaces;i && n;i=i->next)
+ n--;
+
+ if (i) {
+ return i->bcast_s;
+ }
+ return NULL;
+}
+
+/**
+ return netmask of the Nth interface
+ **/
+const char *iface_list_n_netmask(struct interface *ifaces, int n)
+{
+ struct interface *i;
+
+ for (i=ifaces;i && n;i=i->next)
+ n--;
+
+ if (i) {
+ return i->nmask_s;
+ }
+ return NULL;
+}
+
+/**
+ return the local IP address that best matches a destination IP, or
+ our first interface if none match
+*/
+const char *iface_list_best_ip(struct interface *ifaces, const char *dest)
+{
+ struct interface *iface;
+ struct sockaddr_storage ss;
+
+ if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
+ return iface_list_n_ip(ifaces, 0);
+ }
+ iface = iface_list_find(ifaces, (const struct sockaddr *)&ss, true);
+ if (iface) {
+ return iface->ip_s;
+ }
+#ifdef HAVE_IPV6
+ if (ss.ss_family == AF_INET6) {
+ return iface_list_first_v6(ifaces);
+ }
+#endif
+ return iface_list_first_v4(ifaces);
+}
+
+/**
+ return true if an IP is one one of our local networks
+*/
+bool iface_list_is_local(struct interface *ifaces, const char *dest)
+{
+ struct sockaddr_storage ss;
+
+ if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
+ return false;
+ }
+ if (iface_list_find(ifaces, (const struct sockaddr *)&ss, true)) {
+ return true;
+ }
+ return false;
+}
+
+/**
+ return true if a IP matches a IP/netmask pair
+*/
+bool iface_list_same_net(const char *ip1, const char *ip2, const char *netmask)
+{
+ struct sockaddr_storage ip1_ss, ip2_ss, nm_ss;
+
+ if (!interpret_string_addr(&ip1_ss, ip1, AI_NUMERICHOST)) {
+ return false;
+ }
+ if (!interpret_string_addr(&ip2_ss, ip2, AI_NUMERICHOST)) {
+ return false;
+ }
+ if (!interpret_string_addr(&nm_ss, netmask, AI_NUMERICHOST)) {
+ return false;
+ }
+
+ return same_net((struct sockaddr *)&ip1_ss,
+ (struct sockaddr *)&ip2_ss,
+ (struct sockaddr *)&nm_ss);
+}
+
+/**
+ return the list of wildcard interfaces
+ this will include the IPv4 0.0.0.0, and may include IPv6 ::
+*/
+char **iface_list_wildcard(TALLOC_CTX *mem_ctx)
+{
+ char **ret;
+#ifdef HAVE_IPV6
+ ret = str_list_make(mem_ctx, "::,0.0.0.0", NULL);
+#else
+ ret = str_list_make(mem_ctx, "0.0.0.0", NULL);
+#endif
+ return ret;
+}
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