1 files changed, 303 insertions, 0 deletions
diff --git a/lib/socket/interfaces.c b/lib/socket/interfaces.c
new file mode 100644
index 00000000000..618714d1a73
--- /dev/null
+++ b/lib/socket/interfaces.c
@@ -0,0 +1,303 @@
+/*
+   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/>.
+*/
+
+
+#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;
+}