Replace exec uuid2mac and getIPfromDHCPLease to native golang

- Import by https://github.com/ailispaw/xhyvectl/tree/master/vmnet

Signed-off-by: Koichi Shiraishi <[email protected]>

utils.go

@@ -64,22 +64,6 @@ func uuidgen() string {
 	return strings.Replace(out, "\n", "", 1)
 }
 
-func uuid2mac(uuid string) string {
-	cmd := exec.Command("sudo", "uuid2mac", uuid)
-
-	var stdout bytes.Buffer
-	cmd.Stdout = &stdout
-	log.Debugf("execute: %v %v", cmd, uuid)
-
-	err := cmd.Run()
-	if err != nil {
-		log.Error(err)
-	}
-
-	out := stdout.String()
-	return strings.Replace(out, "\n", "", 1)
-}
-
 func hdiutil(args ...string) error {
 	cmd := exec.Command("hdiutil", args...)
 

vmnet/dhcp.go

@@ -0,0 +1,86 @@
+package vmnet
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+const (
+	DHCPD_LEASES_FILE = "/var/db/dhcpd_leases"
+)
+
+type DHCPEntry struct {
+	Name      string
+	IPAddress string
+	HWAddress string
+	ID        string
+	Lease     string
+}
+
+func parseDHCPdLeasesFile() ([]DHCPEntry, error) {
+	file, err := os.Open(DHCPD_LEASES_FILE)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var (
+		dhcpEntry   *DHCPEntry
+		dhcpEntries []DHCPEntry
+	)
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "{" {
+			dhcpEntry = new(DHCPEntry)
+		}
+		if strings.HasPrefix(line, "name=") {
+			dhcpEntry.Name = line[5:]
+		}
+		if strings.HasPrefix(line, "ip_address=") {
+			dhcpEntry.IPAddress = line[11:]
+		}
+		if strings.HasPrefix(line, "hw_address=") {
+			dhcpEntry.HWAddress = line[13:]
+		}
+		if strings.HasPrefix(line, "identifier=") {
+			dhcpEntry.ID = line[11:]
+		}
+		if strings.HasPrefix(line, "lease=") {
+			dhcpEntry.Lease = line[6:]
+		}
+		if line == "}" {
+			dhcpEntries = append(dhcpEntries, *dhcpEntry)
+		}
+	}
+	return dhcpEntries, scanner.Err()
+}
+
+func GetIPAddressByMACAddress(mac string) (string, error) {
+	dhcpEntries, err := parseDHCPdLeasesFile()
+	if err != nil {
+		return "", err
+	}
+	for _, dhcpEntry := range dhcpEntries {
+		if dhcpEntry.HWAddress == mac {
+			return dhcpEntry.IPAddress, nil
+		}
+	}
+	return "", fmt.Errorf("Could not find an IP address for %s", mac)
+}
+
+func GetIPAddressByName(name string) (string, error) {
+	dhcpEntries, err := parseDHCPdLeasesFile()
+	if err != nil {
+		return "", err
+	}
+	for _, dhcpEntry := range dhcpEntries {
+		if dhcpEntry.Name == name {
+			return dhcpEntry.IPAddress, nil
+		}
+	}
+	return "", fmt.Errorf("Could not find an IP address for %s", name)
+}

vmnet/uuid.h

@@ -0,0 +1,153 @@
+/*-
+ * Copyright (c) 2002,2005 Marcel Moolenaar
+ * Copyright (c) 2002 Hiten Mahesh Pandya
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define	_UUID_NODE_LEN 6
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpadded"
+struct uuid {
+	uint32_t time_low;
+	uint16_t time_mid;
+	uint16_t time_hi_and_version;
+	uint8_t clock_seq_hi_and_reserved;
+	uint8_t clock_seq_low;
+	uint8_t node[_UUID_NODE_LEN];
+};
+#pragma clang diagnostic pop
+
+typedef struct uuid uuid_internal_t;
+
+/*
+ * This implementation mostly conforms to the DCE 1.1 specification.
+ * See Also:
+ *	uuidgen(1), uuidgen(2), uuid(3)
+ */
+
+/* Status codes returned by the functions. */
+#define	uuid_s_ok			0
+#define	uuid_s_bad_version		1
+#define	uuid_s_invalid_string_uuid	2
+#define	uuid_s_no_memory		3
+
+/*
+ * uuid_create_nil() - create a nil UUID.
+ * See also:
+ *	http://www.opengroup.org/onlinepubs/009629399/uuid_create_nil.htm
+ */
+static inline void
+uuid_create_nil(uuid_t *u, uint32_t *status)
+{
+	if (status)
+		*status = uuid_s_ok;
+
+	bzero(u, sizeof(*u));
+}
+
+static inline void
+uuid_enc_le(void *buf, uuid_t *uuid)
+{
+	uuid_internal_t *u = (uuid_internal_t *) ((void *) uuid);
+	uint8_t *p = buf;
+	int i;
+
+	memcpy(p, &u->time_low, 4);
+	memcpy(p, &u->time_mid, 2);
+	memcpy(p, &u->time_hi_and_version, 2);
+	p[8] = u->clock_seq_hi_and_reserved;
+	p[9] = u->clock_seq_low;
+	for (i = 0; i < _UUID_NODE_LEN; i++)
+		p[10 + i] = u->node[i];
+}
+
+/*
+ * uuid_from_string() - convert a string representation of an UUID into
+ *			a binary representation.
+ * See also:
+ *	http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
+ *
+ * NOTE: The sequence field is in big-endian, while the time fields are in
+ *	 native byte order.
+ */
+static inline void
+uuid_from_string(const char *s, uuid_t *uuid, uint32_t *status)
+{
+	uuid_internal_t *u = (uuid_internal_t *) ((void *) uuid);
+	int n;
+
+	/* Short-circuit 2 special cases: NULL pointer and empty string. */
+	if (s == NULL || *s == '\0') {
+		uuid_create_nil(((uuid_t *) u), status);
+		return;
+	}
+
+	/* Assume the worst. */
+	if (status != NULL)
+		*status = uuid_s_invalid_string_uuid;
+
+	/* The UUID string representation has a fixed length. */
+	if (strlen(s) != 36)
+		return;
+
+	/*
+	 * We only work with "new" UUIDs. New UUIDs have the form:
+	 *	01234567-89ab-cdef-0123-456789abcdef
+	 * The so called "old" UUIDs, which we don't support, have the form:
+	 *	0123456789ab.cd.ef.01.23.45.67.89.ab
+	 */
+	if (s[8] != '-')
+		return;
+
+	n = sscanf(s,
+	    "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
+	    &u->time_low, &u->time_mid, &u->time_hi_and_version,
+	    &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
+	    &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
+
+	/* Make sure we have all conversions. */
+	if (n != 11)
+		return;
+
+	/* We have a successful scan. Check semantics... */
+	n = u->clock_seq_hi_and_reserved;
+	if ((n & 0x80) != 0x00 &&			/* variant 0? */
+	    (n & 0xc0) != 0x80 &&			/* variant 1? */
+	    (n & 0xe0) != 0xc0) {			/* variant 2? */
+		if (status != NULL)
+			*status = uuid_s_bad_version;
+	} else {
+		if (status != NULL)
+			*status = uuid_s_ok;
+	}
+}

vmnet/vmnet.c

@@ -0,0 +1,133 @@
+/*-
+ * Copyright (c) 2011 NetApp, Inc.
+ * Copyright (c) 2015 xhyve developers
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * https://github.com/mirage/ocaml-vmnet/blob/master/lib/vmnet_stubs.c
+ *
+ * Copyright (C) 2014 Anil Madhavapeddy <[email protected]>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include <vmnet/vmnet.h>
+
+#include "uuid.h"
+
+static char*
+vmnet_get_mac_address_from_uuid(char *guest_uuid_str) {
+/*
+ * from vmn_create() in https://github.com/mist64/xhyve/blob/master/src/pci_virtio_vmnet.c
+ */
+  xpc_object_t interface_desc;
+  uuid_t uuid;
+  __block interface_ref iface;
+  __block vmnet_return_t iface_status;
+  __block char* mac = malloc(18);
+  dispatch_semaphore_t iface_created, iface_stopped;
+  dispatch_queue_t if_create_q, if_stop_q;
+  uint32_t uuid_status;
+
+  interface_desc = xpc_dictionary_create(NULL, NULL, 0);
+  xpc_dictionary_set_uint64(interface_desc, vmnet_operation_mode_key, VMNET_SHARED_MODE);
+
+  uuid_from_string(guest_uuid_str, &uuid, &uuid_status);
+  if (uuid_status != uuid_s_ok) {
+    fprintf(stderr, "Invalid UUID\n");
+    return NULL;
+  }
+
+  xpc_dictionary_set_uuid(interface_desc, vmnet_interface_id_key, uuid);
+  iface = NULL;
+  iface_status = 0;
+
+  if_create_q = dispatch_queue_create("org.xhyve.vmnet.create", DISPATCH_QUEUE_SERIAL);
+
+  iface_created = dispatch_semaphore_create(0);
+
+  iface = vmnet_start_interface(interface_desc, if_create_q,
+    ^(vmnet_return_t status, xpc_object_t interface_param)
+  {
+    iface_status = status;
+    if (status != VMNET_SUCCESS || !interface_param) {
+      dispatch_semaphore_signal(iface_created);
+      return;
+    }
+
+    //printf("%s\n", xpc_dictionary_get_string(interface_param, vmnet_mac_address_key));
+    const char *macStr = xpc_dictionary_get_string(interface_param, vmnet_mac_address_key);
+    strcpy(mac, macStr);
+
+    dispatch_semaphore_signal(iface_created);
+  });
+
+  dispatch_semaphore_wait(iface_created, DISPATCH_TIME_FOREVER);
+  dispatch_release(if_create_q);
+
+  if (iface == NULL || iface_status != VMNET_SUCCESS) {
+    fprintf(stderr, "virtio_net: Could not create vmnet interface, "
+      "permission denied or no entitlement?\n");
+    return NULL;
+  }
+
+  iface_status = 0;
+
+  if_stop_q = dispatch_queue_create("org.xhyve.vmnet.stop", DISPATCH_QUEUE_SERIAL);
+
+  iface_stopped = dispatch_semaphore_create(0);
+
+  iface_status = vmnet_stop_interface(iface, if_stop_q,
+    ^(vmnet_return_t status)
+  {
+    iface_status = status;
+    dispatch_semaphore_signal(iface_stopped);
+  });
+
+  dispatch_semaphore_wait(iface_stopped, DISPATCH_TIME_FOREVER);
+  dispatch_release(if_stop_q);
+
+  if (iface_status != VMNET_SUCCESS) {
+    fprintf(stderr, "virtio_net: Could not stop vmnet interface, "
+      "permission denied or no entitlement?\n");
+    return NULL;
+  }
+
+  return mac;
+}