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-rw-r--r--lib/socket/interfaces.c314
-rw-r--r--lib/socket/interfaces.h44
-rw-r--r--lib/socket/wscript_build7
3 files changed, 365 insertions, 0 deletions
diff --git a/lib/socket/interfaces.c b/lib/socket/interfaces.c
new file mode 100644
index 0000000000..1801e870f0
--- /dev/null
+++ b/lib/socket/interfaces.c
@@ -0,0 +1,314 @@
+/*
+ Unix SMB/CIFS implementation.
+ return a list of network interfaces
+ Copyright (C) Andrew Tridgell 1998
+ Copyright (C) Jeremy Allison 2007
+ Copyright (C) Jelmer Vernooij 2007
+
+ 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/>.
+*/
+
+
+/* working out the interfaces for a OS is an incredibly non-portable
+ thing. We have several possible implementations below, and autoconf
+ tries each of them to see what works
+
+ Note that this file does _not_ include includes.h. That is so this code
+ can be called directly from the autoconf tests. That also means
+ this code cannot use any of the normal Samba debug stuff or defines.
+ This is standalone code.
+
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "interfaces.h"
+#include "lib/util/tsort.h"
+
+/****************************************************************************
+ Create a struct sockaddr_storage with the netmask bits set to 1.
+****************************************************************************/
+
+bool make_netmask(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ unsigned long masklen)
+{
+ *pss_out = *pss_in;
+ /* Now apply masklen bits of mask. */
+#if defined(HAVE_IPV6)
+ if (pss_in->ss_family == AF_INET6) {
+ char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+ unsigned int i;
+
+ if (masklen > 128) {
+ return false;
+ }
+ for (i = 0; masklen >= 8; masklen -= 8, i++) {
+ *p++ = 0xff;
+ }
+ /* Deal with the partial byte. */
+ *p++ &= (0xff & ~(0xff>>masklen));
+ i++;
+ for (;i < sizeof(struct in6_addr); i++) {
+ *p++ = '\0';
+ }
+ return true;
+ }
+#endif
+ if (pss_in->ss_family == AF_INET) {
+ if (masklen > 32) {
+ return false;
+ }
+ ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
+ htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
+ return true;
+ }
+ return false;
+}
+
+/****************************************************************************
+ Create a struct sockaddr_storage set to the broadcast or network adress from
+ an incoming sockaddr_storage.
+****************************************************************************/
+
+static void make_bcast_or_net(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask,
+ bool make_bcast_p)
+{
+ unsigned int i = 0, len = 0;
+ char *pmask = NULL;
+ char *p = NULL;
+ *pss_out = *pss_in;
+
+ /* Set all zero netmask bits to 1. */
+#if defined(HAVE_IPV6)
+ if (pss_in->ss_family == AF_INET6) {
+ p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+ pmask = discard_const_p(char, &((struct sockaddr_in6 *)nmask)->sin6_addr);
+ len = 16;
+ }
+#endif
+ if (pss_in->ss_family == AF_INET) {
+ p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
+ pmask = discard_const_p(char, &((struct sockaddr_in *)nmask)->sin_addr);
+ len = 4;
+ }
+
+ for (i = 0; i < len; i++, p++, pmask++) {
+ if (make_bcast_p) {
+ *p = (*p & *pmask) | (*pmask ^ 0xff);
+ } else {
+ /* make_net */
+ *p = (*p & *pmask);
+ }
+ }
+}
+
+void make_bcast(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask)
+{
+ make_bcast_or_net(pss_out, pss_in, nmask, true);
+}
+
+void make_net(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask)
+{
+ make_bcast_or_net(pss_out, pss_in, nmask, false);
+}
+
+
+/****************************************************************************
+ Try the "standard" getifaddrs/freeifaddrs interfaces.
+ Also gets IPv6 interfaces.
+****************************************************************************/
+
+/****************************************************************************
+ Get the netmask address for a local interface.
+****************************************************************************/
+
+static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
+{
+ struct iface_struct *ifaces;
+ struct ifaddrs *iflist = NULL;
+ struct ifaddrs *ifptr = NULL;
+ int count;
+ int total = 0;
+ size_t copy_size;
+
+ if (getifaddrs(&iflist) < 0) {
+ return -1;
+ }
+
+ count = 0;
+ for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
+ if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
+ continue;
+ }
+ if (!(ifptr->ifa_flags & IFF_UP)) {
+ continue;
+ }
+ count += 1;
+ }
+
+ ifaces = talloc_array(mem_ctx, struct iface_struct, count);
+ if (ifaces == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ /* Loop through interfaces, looking for given IP address */
+ for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
+
+ if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
+ continue;
+ }
+
+ /* Check the interface is up. */
+ if (!(ifptr->ifa_flags & IFF_UP)) {
+ continue;
+ }
+
+ memset(&ifaces[total], '\0', sizeof(ifaces[total]));
+
+ copy_size = sizeof(struct sockaddr_in);
+
+ ifaces[total].flags = ifptr->ifa_flags;
+
+#if defined(HAVE_IPV6)
+ if (ifptr->ifa_addr->sa_family == AF_INET6) {
+ copy_size = sizeof(struct sockaddr_in6);
+ }
+#endif
+
+ memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
+ memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
+
+ if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
+ make_bcast(&ifaces[total].bcast,
+ &ifaces[total].ip,
+ &ifaces[total].netmask);
+ } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
+ ifptr->ifa_dstaddr ) {
+ memcpy(&ifaces[total].bcast,
+ ifptr->ifa_dstaddr,
+ copy_size);
+ } else {
+ continue;
+ }
+
+ strlcpy(ifaces[total].name, ifptr->ifa_name,
+ sizeof(ifaces[total].name));
+ total++;
+ }
+
+ freeifaddrs(iflist);
+
+ *pifaces = ifaces;
+ return total;
+}
+
+static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
+{
+ int r;
+
+#if defined(HAVE_IPV6)
+ /*
+ * If we have IPv6 - sort these interfaces lower
+ * than any IPv4 ones.
+ */
+ if (i1->ip.ss_family == AF_INET6 &&
+ i2->ip.ss_family == AF_INET) {
+ return -1;
+ } else if (i1->ip.ss_family == AF_INET &&
+ i2->ip.ss_family == AF_INET6) {
+ return 1;
+ }
+
+ if (i1->ip.ss_family == AF_INET6) {
+ struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
+ struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
+
+ r = memcmp(&s1->sin6_addr,
+ &s2->sin6_addr,
+ sizeof(struct in6_addr));
+ if (r) {
+ return r;
+ }
+
+ s1 = (struct sockaddr_in6 *)&i1->netmask;
+ s2 = (struct sockaddr_in6 *)&i2->netmask;
+
+ r = memcmp(&s1->sin6_addr,
+ &s2->sin6_addr,
+ sizeof(struct in6_addr));
+ if (r) {
+ return r;
+ }
+ }
+#endif
+
+ /* AIX uses __ss_family instead of ss_family inside of
+ sockaddr_storage. Instead of trying to figure out which field to
+ use, we can just cast it to a sockaddr.
+ */
+
+ if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
+ struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
+ struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
+
+ r = ntohl(s1->sin_addr.s_addr) -
+ ntohl(s2->sin_addr.s_addr);
+ if (r) {
+ return r;
+ }
+
+ s1 = (struct sockaddr_in *)&i1->netmask;
+ s2 = (struct sockaddr_in *)&i2->netmask;
+
+ return ntohl(s1->sin_addr.s_addr) -
+ ntohl(s2->sin_addr.s_addr);
+ }
+ return 0;
+}
+
+/* this wrapper is used to remove duplicates from the interface list generated
+ above */
+int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
+{
+ struct iface_struct *ifaces;
+ int total, i, j;
+
+ total = _get_interfaces(mem_ctx, &ifaces);
+ if (total <= 0) return total;
+
+ /* now we need to remove duplicates */
+ TYPESAFE_QSORT(ifaces, total, iface_comp);
+
+ for (i=1;i<total;) {
+ if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
+ for (j=i-1;j<total-1;j++) {
+ ifaces[j] = ifaces[j+1];
+ }
+ total--;
+ } else {
+ i++;
+ }
+ }
+
+ *pifaces = ifaces;
+ return total;
+}
diff --git a/lib/socket/interfaces.h b/lib/socket/interfaces.h
new file mode 100644
index 0000000000..b4e113dcc8
--- /dev/null
+++ b/lib/socket/interfaces.h
@@ -0,0 +1,44 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ structures for lib/netif/
+
+ Copyright (C) Andrew Tridgell 2004
+
+ 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 "system/network.h"
+
+struct iface_struct {
+ char name[16];
+ int flags;
+ struct sockaddr_storage ip;
+ struct sockaddr_storage netmask;
+ struct sockaddr_storage bcast;
+};
+
+struct interface;
+
+bool make_netmask(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ unsigned long masklen);
+void make_bcast(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask);
+void make_net(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask);
+
+int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces);
diff --git a/lib/socket/wscript_build b/lib/socket/wscript_build
new file mode 100644
index 0000000000..61bde129c5
--- /dev/null
+++ b/lib/socket/wscript_build
@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+
+bld.SAMBA_LIBRARY('interfaces',
+ source='interfaces.c',
+ deps='samba-util',
+ private_library=True
+ )
generated by cgit (git 2.34.1) at 2024-11-22 06:47:27 +0000