1 files changed, 662 insertions, 0 deletions
diff --git a/lib/libifconfig/libifconfig.c b/lib/libifconfig/libifconfig.c
new file mode 100644
index 000000000000..f844ae235a71
--- /dev/null
+++ b/lib/libifconfig/libifconfig.c
@@ -0,0 +1,662 @@
+/*
+ * Copyright (c) 1983, 1993
+ *  The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2016-2017, Marie Helene Kvello-Aune.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_mib.h>
+#include <netinet/in.h>
+#include <netinet6/in6_var.h>
+#include <netinet6/nd6.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <ifaddrs.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <net/if_vlan_var.h>
+
+#include "libifconfig.h"
+#include "libifconfig_internal.h"
+
+#define NOTAG    ((u_short) -1)
+
+static bool
+isnd6defif(ifconfig_handle_t *h, const char *name)
+{
+	struct in6_ndifreq ndifreq;
+	unsigned int ifindex;
+
+	memset(&ndifreq, 0, sizeof(ndifreq));
+	strlcpy(ndifreq.ifname, name, sizeof(ndifreq.ifname));
+	ifindex = if_nametoindex(ndifreq.ifname);
+	if (ifconfig_ioctlwrap(h, AF_INET6, SIOCGDEFIFACE_IN6, &ndifreq) < 0) {
+		return (false);
+	}
+	h->error.errtype = OK;
+	return (ndifreq.ifindex == ifindex);
+}
+
+ifconfig_handle_t *
+ifconfig_open(void)
+{
+	ifconfig_handle_t *h;
+
+	h = calloc(1, sizeof(*h));
+
+	if (h == NULL) {
+		return (NULL);
+	}
+	for (int i = 0; i <= AF_MAX; i++) {
+		h->sockets[i] = -1;
+	}
+
+	return (h);
+}
+
+void
+ifconfig_close(ifconfig_handle_t *h)
+{
+
+	for (int i = 0; i <= AF_MAX; i++) {
+		if (h->sockets[i] != -1) {
+			(void)close(h->sockets[i]);
+		}
+	}
+	freeifaddrs(h->ifap);
+	free(h);
+}
+
+ifconfig_errtype
+ifconfig_err_errtype(ifconfig_handle_t *h)
+{
+
+	return (h->error.errtype);
+}
+
+int
+ifconfig_err_errno(ifconfig_handle_t *h)
+{
+
+	return (h->error.errcode);
+}
+
+unsigned long
+ifconfig_err_ioctlreq(ifconfig_handle_t *h)
+{
+
+	return (h->error.ioctl_request);
+}
+
+int
+ifconfig_foreach_iface(ifconfig_handle_t *h,
+    ifconfig_foreach_func_t cb, void *udata)
+{
+	int ret;
+
+	ret = ifconfig_getifaddrs(h);
+	if (ret == 0) {
+		struct ifaddrs *ifa;
+		char *ifname = NULL;
+
+		for (ifa = h->ifap; ifa; ifa = ifa->ifa_next) {
+			if (ifname != ifa->ifa_name) {
+				ifname = ifa->ifa_name;
+				cb(h, ifa, udata);
+			}
+		}
+	}
+	/* Free ifaddrs so we don't accidentally cache stale data */
+	freeifaddrs(h->ifap);
+	h->ifap = NULL;
+
+	return (ret);
+}
+
+void
+ifconfig_foreach_ifaddr(ifconfig_handle_t *h, struct ifaddrs *ifa,
+    ifconfig_foreach_func_t cb, void *udata)
+{
+	struct ifaddrs *ift;
+
+	for (ift = ifa;
+	    ift != NULL &&
+	    ift->ifa_addr != NULL &&
+	    strcmp(ift->ifa_name, ifa->ifa_name) == 0;
+	    ift = ift->ifa_next) {
+		cb(h, ift, udata);
+	}
+}
+
+int
+ifconfig_get_description(ifconfig_handle_t *h, const char *name,
+    char **description)
+{
+	struct ifreq ifr;
+	char *descr;
+	size_t descrlen;
+
+	descr = NULL;
+	descrlen = 64;
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	for (;;) {
+		if ((descr = reallocf(descr, descrlen)) == NULL) {
+			h->error.errtype = OTHER;
+			h->error.errcode = ENOMEM;
+			return (-1);
+		}
+
+		ifr.ifr_buffer.buffer = descr;
+		ifr.ifr_buffer.length = descrlen;
+		if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFDESCR, &ifr) != 0) {
+			free(descr);
+			return (-1);
+		}
+
+		if (ifr.ifr_buffer.buffer == descr) {
+			if (strlen(descr) > 0) {
+				*description = strdup(descr);
+				free(descr);
+
+				if (description == NULL) {
+					h->error.errtype = OTHER;
+					h->error.errcode = ENOMEM;
+					return (-1);
+				}
+
+				return (0);
+			}
+		} else if (ifr.ifr_buffer.length > descrlen) {
+			descrlen = ifr.ifr_buffer.length;
+			continue;
+		}
+		break;
+	}
+	free(descr);
+	h->error.errtype = OTHER;
+	h->error.errcode = 0;
+	return (-1);
+}
+
+int
+ifconfig_set_description(ifconfig_handle_t *h, const char *name,
+    const char *newdescription)
+{
+	struct ifreq ifr;
+	int desclen;
+
+	memset(&ifr, 0, sizeof(ifr));
+	desclen = strlen(newdescription);
+
+	/*
+	 * Unset description if the new description is 0 characters long.
+	 * TODO: Decide whether this should be an error condition instead.
+	 */
+	if (desclen == 0) {
+		return (ifconfig_unset_description(h, name));
+	}
+
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	ifr.ifr_buffer.length = desclen + 1;
+	ifr.ifr_buffer.buffer = strdup(newdescription);
+
+	if (ifr.ifr_buffer.buffer == NULL) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOMEM;
+		return (-1);
+	}
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFDESCR, &ifr) != 0) {
+		free(ifr.ifr_buffer.buffer);
+		return (-1);
+	}
+
+	free(ifr.ifr_buffer.buffer);
+	return (0);
+}
+
+int
+ifconfig_unset_description(ifconfig_handle_t *h, const char *name)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	ifr.ifr_buffer.length = 0;
+	ifr.ifr_buffer.buffer = NULL;
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFDESCR, &ifr) < 0) {
+		return (-1);
+	}
+	return (0);
+}
+
+int
+ifconfig_set_name(ifconfig_handle_t *h, const char *name, const char *newname)
+{
+	struct ifreq ifr;
+	char *tmpname;
+
+	memset(&ifr, 0, sizeof(ifr));
+	tmpname = strdup(newname);
+	if (tmpname == NULL) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOMEM;
+		return (-1);
+	}
+
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	ifr.ifr_data = tmpname;
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFNAME, &ifr) != 0) {
+		free(tmpname);
+		return (-1);
+	}
+
+	free(tmpname);
+	return (0);
+}
+
+int
+ifconfig_get_orig_name(ifconfig_handle_t *h, const char *ifname,
+    char **orig_name)
+{
+	size_t len;
+	unsigned int ifindex;
+	int name[6];
+
+	ifindex = if_nametoindex(ifname);
+	if (ifindex == 0) {
+		goto fail;
+	}
+
+	name[0] = CTL_NET;
+	name[1] = PF_LINK;
+	name[2] = NETLINK_GENERIC;
+	name[3] = IFMIB_IFDATA;
+	name[4] = ifindex;
+	name[5] = IFDATA_DRIVERNAME;
+
+	len = 0;
+	if (sysctl(name, 6, NULL, &len, 0, 0) < 0) {
+		goto fail;
+	}
+
+	*orig_name = malloc(len);
+	if (*orig_name == NULL) {
+		goto fail;
+	}
+
+	if (sysctl(name, 6, *orig_name, &len, 0, 0) < 0) {
+		free(*orig_name);
+		*orig_name = NULL;
+		goto fail;
+	}
+
+	return (0);
+
+fail:
+	h->error.errtype = OTHER;
+	h->error.errcode = (errno != 0) ? errno : ENOENT;
+	return (-1);
+}
+
+int
+ifconfig_get_fib(ifconfig_handle_t *h, const char *name, int *fib)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFFIB, &ifr) == -1) {
+		return (-1);
+	}
+
+	*fib = ifr.ifr_fib;
+	return (0);
+}
+
+int
+ifconfig_set_mtu(ifconfig_handle_t *h, const char *name, const int mtu)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	ifr.ifr_mtu = mtu;
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFMTU, &ifr) < 0) {
+		return (-1);
+	}
+
+	return (0);
+}
+
+int
+ifconfig_get_mtu(ifconfig_handle_t *h, const char *name, int *mtu)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFMTU, &ifr) == -1) {
+		return (-1);
+	}
+
+	*mtu = ifr.ifr_mtu;
+	return (0);
+}
+
+int
+ifconfig_get_nd6(ifconfig_handle_t *h, const char *name,
+    struct in6_ndireq *nd)
+{
+	memset(nd, 0, sizeof(*nd));
+	strlcpy(nd->ifname, name, sizeof(nd->ifname));
+	if (ifconfig_ioctlwrap(h, AF_INET6, SIOCGIFINFO_IN6, nd) == -1) {
+		return (-1);
+	}
+	if (isnd6defif(h, name)) {
+		nd->ndi.flags |= ND6_IFF_DEFAULTIF;
+	} else if (h->error.errtype != OK) {
+		return (-1);
+	}
+
+	return (0);
+}
+
+int
+ifconfig_set_metric(ifconfig_handle_t *h, const char *name, const int metric)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	ifr.ifr_metric = metric;
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFMETRIC, &ifr) < 0) {
+		return (-1);
+	}
+
+	return (0);
+}
+
+int
+ifconfig_get_metric(ifconfig_handle_t *h, const char *name, int *metric)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFMETRIC, &ifr) == -1) {
+		return (-1);
+	}
+
+	*metric = ifr.ifr_metric;
+	return (0);
+}
+
+int
+ifconfig_set_capability(ifconfig_handle_t *h, const char *name,
+    const int capability)
+{
+	struct ifreq ifr;
+	struct ifconfig_capabilities ifcap;
+	int flags, value;
+
+	memset(&ifr, 0, sizeof(ifr));
+
+	if (ifconfig_get_capability(h, name, &ifcap) != 0) {
+		return (-1);
+	}
+
+	value = capability;
+	flags = ifcap.curcap;
+	if (value < 0) {
+		value = -value;
+		flags &= ~value;
+	} else {
+		flags |= value;
+	}
+	flags &= ifcap.reqcap;
+
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	/*
+	 * TODO: Verify that it's safe to not have ifr.ifr_curcap
+	 * set for this request.
+	 */
+	ifr.ifr_reqcap = flags;
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSIFCAP, &ifr) < 0) {
+		return (-1);
+	}
+	return (0);
+}
+
+int
+ifconfig_get_capability(ifconfig_handle_t *h, const char *name,
+    struct ifconfig_capabilities *capability)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFCAP, &ifr) < 0) {
+		return (-1);
+	}
+	capability->curcap = ifr.ifr_curcap;
+	capability->reqcap = ifr.ifr_reqcap;
+	return (0);
+}
+
+int
+ifconfig_get_groups(ifconfig_handle_t *h, const char *name,
+    struct ifgroupreq *ifgr)
+{
+	int len;
+
+	memset(ifgr, 0, sizeof(*ifgr));
+	strlcpy(ifgr->ifgr_name, name, IFNAMSIZ);
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFGROUP, ifgr) == -1) {
+		if ((h->error.errcode == EINVAL) ||
+		    (h->error.errcode == ENOTTY)) {
+			return (0);
+		} else {
+			return (-1);
+		}
+	}
+
+	len = ifgr->ifgr_len;
+	ifgr->ifgr_groups = (struct ifg_req *)malloc(len);
+	if (ifgr->ifgr_groups == NULL) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOMEM;
+		return (-1);
+	}
+	bzero(ifgr->ifgr_groups, len);
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFGROUP, ifgr) == -1) {
+		return (-1);
+	}
+
+	return (0);
+}
+
+int
+ifconfig_get_ifstatus(ifconfig_handle_t *h, const char *name,
+    struct ifstat *ifs)
+{
+	strlcpy(ifs->ifs_name, name, sizeof(ifs->ifs_name));
+	return (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCGIFSTATUS, ifs));
+}
+
+int
+ifconfig_destroy_interface(ifconfig_handle_t *h, const char *name)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCIFDESTROY, &ifr) < 0) {
+		return (-1);
+	}
+	return (0);
+}
+
+int
+ifconfig_create_interface(ifconfig_handle_t *h, const char *name, char **ifname)
+{
+	struct ifreq ifr;
+
+	memset(&ifr, 0, sizeof(ifr));
+
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	/*
+	 * TODO:
+	 * Insert special snowflake handling here. See GitHub issue #12 for details.
+	 * In the meantime, hard-nosupport interfaces that need special handling.
+	 */
+	if ((strncmp(name, "wlan",
+	    strlen("wlan")) == 0) ||
+	    (strncmp(name, "vlan",
+	    strlen("vlan")) == 0) ||
+	    (strncmp(name, "vxlan",
+	    strlen("vxlan")) == 0)) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOSYS;
+		return (-1);
+	}
+
+	/* No special handling for this interface type. */
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCIFCREATE2, &ifr) < 0) {
+		return (-1);
+	}
+
+	*ifname = strdup(ifr.ifr_name);
+	if (ifname == NULL) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOMEM;
+		return (-1);
+	}
+
+	return (0);
+}
+
+int
+ifconfig_create_interface_vlan(ifconfig_handle_t *h, const char *name,
+    char **ifname, const char *vlandev, const unsigned short vlantag)
+{
+	struct ifreq ifr;
+	struct vlanreq params;
+
+	if ((vlantag == NOTAG) || (vlandev[0] == '\0')) {
+		// TODO: Add proper error tracking here
+		return (-1);
+	}
+
+	bzero(&params, sizeof(params));
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	params.vlr_tag = vlantag;
+	(void)strlcpy(params.vlr_parent, vlandev, sizeof(params.vlr_parent));
+	ifr.ifr_data = (caddr_t)&params;
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCIFCREATE2, &ifr) < 0) {
+		// TODO: Add proper error tracking here
+		return (-1);
+	}
+
+	*ifname = strdup(ifr.ifr_name);
+	return (0);
+}
+
+int
+ifconfig_set_vlantag(ifconfig_handle_t *h, const char *name,
+    const char *vlandev, const unsigned short vlantag)
+{
+	struct ifreq ifr;
+	struct vlanreq params;
+
+	bzero(&params, sizeof(params));
+	params.vlr_tag = vlantag;
+	strlcpy(params.vlr_parent, vlandev, sizeof(params.vlr_parent));
+
+	ifr.ifr_data = (caddr_t)&params;
+	(void)strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSETVLAN, &ifr) == -1) {
+		return (-1);
+	}
+	return (0);
+}
+
+int
+ifconfig_list_cloners(ifconfig_handle_t *h, char **bufp, size_t *lenp)
+{
+	struct if_clonereq ifcr;
+	char *buf;
+
+	memset(&ifcr, 0, sizeof(ifcr));
+	*bufp = NULL;
+	*lenp = 0;
+
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCIFGCLONERS, &ifcr) < 0)
+		return (-1);
+
+	buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
+	if (buf == NULL) {
+		h->error.errtype = OTHER;
+		h->error.errcode = ENOMEM;
+		return (-1);
+	}
+
+	ifcr.ifcr_count = ifcr.ifcr_total;
+	ifcr.ifcr_buffer = buf;
+	if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCIFGCLONERS, &ifcr) < 0) {
+		free(buf);
+		return (-1);
+	}
+
+	*bufp = buf;
+	*lenp = ifcr.ifcr_total;
+	return (0);
+}