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	diff --git a/libnozzle/libnozzle.c b/libnozzle/libnozzle.c
	index 7c5ae6ec..903f36ae 100644
	--- a/libnozzle/libnozzle.c
	+++ b/libnozzle/libnozzle.c
	@@ -1,1207 +1,1207 @@
	/*
	* Copyright (C) 2010-2018 Red Hat, Inc. All rights reserved.
	*
	* Author: Fabio M. Di Nitto <fabbione@kronosnet.org>
	*
	* This software licensed under GPL-2.0+, LGPL-2.0+
	*/

	#include "config.h"

	#include <errno.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <sys/wait.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <sys/ioctl.h>
	#include <net/ethernet.h>
	#include <pthread.h>
	#include <limits.h>
	#include <stdio.h>
	#include <net/if.h>
	#include <ifaddrs.h>
	#include <stdint.h>

	#ifdef KNET_LINUX
	#include <linux/if_tun.h>
	/*
	* libnl3 < 3.3 includes kernel headers directly
	* causing conflicts with net/if.h included above
	*/
	#ifdef LIBNL3_WORKAROUND
	#define _LINUX_IF_H 1
	#endif
	#include <netinet/ether.h>
	#include <netlink/netlink.h>
	#include <netlink/route/addr.h>
	#include <netlink/route/link.h>
	#endif
	#ifdef KNET_BSD
	#include <net/if_dl.h>
	#endif

	#include "libnozzle.h"
	#include "internals.h"

	/*
	* internal functions are all _unlocked_
	* locking should be handled at external API functions
	*/
	static int lib_init = 0;
	static struct nozzle_lib_config lib_cfg;
	static pthread_mutex_t config_mutex = PTHREAD_MUTEX_INITIALIZER;

	/*
	* internal helpers
	*/

	static void lib_fini(void)
	{
	if (lib_cfg.head == NULL) {
	#ifdef KNET_LINUX
	nl_close(lib_cfg.nlsock);
	nl_socket_free(lib_cfg.nlsock);
	#endif
	close(lib_cfg.ioctlfd);
	lib_init = 0;
	}
	}

	static int is_valid_nozzle(const nozzle_t nozzle)
	{
	nozzle_t temp;

	if (!nozzle) {
	return 0;
	}

	if (!lib_init) {
	return 0;
	}

	temp = lib_cfg.head;

	while (temp != NULL) {
	if (nozzle == temp)
	return 1;

	temp = temp->next;
	}

	return 0;
	}

	static void destroy_iface(nozzle_t nozzle)
	{
	#ifdef KNET_BSD
	struct ifreq ifr;
	#endif

	if (!nozzle)
	return;

	if (nozzle->fd)
	close(nozzle->fd);

	#ifdef KNET_BSD
	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);

	ioctl(lib_cfg.ioctlfd, SIOCIFDESTROY, &ifr);
	#endif

	free(nozzle);

	lib_fini();

	return;
	}

	static int get_iface_mtu(const nozzle_t nozzle)
	{
	int err = 0, savederrno = 0;
	struct ifreq ifr;

	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);

	err = ioctl(lib_cfg.ioctlfd, SIOCGIFMTU, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	err = ifr.ifr_mtu;

	out_clean:
	errno = savederrno;
	return err;
	}

	static int get_iface_mac(const nozzle_t nozzle, char **ether_addr)
	{
	int err = 0, savederrno = 0;
	struct ifreq ifr;
	char mac[MACADDR_CHAR_MAX];
	#ifdef KNET_BSD
	struct ifaddrs *ifap = NULL;
	struct ifaddrs *ifa;
	int found = 0;
	#endif

	memset(&mac, 0, MACADDR_CHAR_MAX);
	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);

	#ifdef KNET_LINUX
	err = ioctl(lib_cfg.ioctlfd, SIOCGIFHWADDR, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	ether_ntoa_r((struct ether_addr *)ifr.ifr_hwaddr.sa_data, mac);
	#endif
	#ifdef KNET_BSD
	/*
	* there is no ioctl to get the ether address of an interface on FreeBSD
	* (not to be confused with hwaddr). Use workaround described here:
	* https://lists.freebsd.org/pipermail/freebsd-hackers/2004-June/007394.html
	*/
	err = getifaddrs(&ifap);
	if (err < 0) {
	savederrno = errno;
	goto out_clean;
	}

	ifa = ifap;

	while (ifa) {
	if (!strncmp(nozzle->name, ifa->ifa_name, IFNAMSIZ)) {
	found = 1;
	break;
	}
	ifa=ifa->ifa_next;
	}

	if (found) {
	ether_ntoa_r((struct ether_addr )LLADDR((struct sockaddr_dl )ifa->ifa_addr), mac);
	} else {
	errno = EINVAL;
	err = -1;
	}

	freeifaddrs(ifap);

	if (err) {
	goto out_clean;
	}

	#endif
	*ether_addr = strdup(mac);
	if (!*ether_addr) {
	savederrno = errno;
	err = -1;
	}

	out_clean:
	errno = savederrno;
	return err;
	}

	#define IP_ADD 1
	#define IP_DEL 2

	static int _set_ip(nozzle_t nozzle,
	int command,
	const char ipaddr, const char prefix,
	int secondary)
	{
	int fam;
	char *broadcast = NULL;
	int err = 0;
	#ifdef KNET_LINUX
	struct rtnl_addr *addr = NULL;
	struct nl_addr *local_addr = NULL;
	struct nl_addr *bcast_addr = NULL;
	struct nl_cache *cache = NULL;
	int ifindex;
	#endif
	#ifdef KNET_BSD
	char cmdline[4096];
	char proto[6];
	char *error_string = NULL;
	#endif

	if (!strchr(ipaddr, ':')) {
	fam = AF_INET;
	broadcast = generate_v4_broadcast(ipaddr, prefix);
	if (!broadcast) {
	errno = EINVAL;
	return -1;
	}
	} else {
	fam = AF_INET6;
	}

	#ifdef KNET_LINUX
	addr = rtnl_addr_alloc();
	if (!addr) {
	errno = ENOMEM;
	return -1;
	}

	if (rtnl_link_alloc_cache(lib_cfg.nlsock, AF_UNSPEC, &cache) < 0) {
	errno = ENOMEM;
	err = -1;
	goto out;
	}

	ifindex = rtnl_link_name2i(cache, nozzle->name);
	if (ifindex == 0) {
	errno = ENOENT;
	err = -1;
	goto out;
	}

	rtnl_addr_set_ifindex(addr, ifindex);

	if (nl_addr_parse(ipaddr, fam, &local_addr) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}

	if (rtnl_addr_set_local(addr, local_addr) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}

	if (broadcast) {
	if (nl_addr_parse(broadcast, fam, &bcast_addr) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}

	if (rtnl_addr_set_broadcast(addr, bcast_addr) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}
	}

	rtnl_addr_set_prefixlen(addr, atoi(prefix));

	if (command == IP_ADD) {
	if (rtnl_addr_add(lib_cfg.nlsock, addr, 0) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}
	} else {
	if (rtnl_addr_delete(lib_cfg.nlsock, addr, 0) < 0) {
	errno = EINVAL;
	err = -1;
	goto out;
	}
	}
	out:
	if (addr) {
	rtnl_addr_put(addr);
	}
	if (local_addr) {
	nl_addr_put(local_addr);
	}
	if (bcast_addr) {
	nl_addr_put(bcast_addr);
	}
	if (cache) {
	nl_cache_put(cache);
	}
	if (broadcast) {
	free(broadcast);
	}
	return err;
	#endif
	#ifdef KNET_BSD
	/*
	* TODO: port to use ioctl and such, drop shell forking here
	*/
	memset(cmdline, 0, sizeof(cmdline));

	if (fam == AF_INET) {
	snprintf(proto, sizeof(proto), "inet");
	} else {
	snprintf(proto, sizeof(proto), "inet6");
	}

	if (command == IP_ADD) {
	snprintf(cmdline, sizeof(cmdline)-1,
	"ifconfig %s %s %s/%s",
	nozzle->name, proto, ipaddr, prefix);
	if (broadcast) {
	snprintf(cmdline + strlen(cmdline),
	sizeof(cmdline) - strlen(cmdline) -1,
	" broadcast %s", broadcast);
	}
	if ((secondary) && (fam == AF_INET)) {
	snprintf(cmdline + strlen(cmdline),
	sizeof(cmdline) - strlen(cmdline) -1,
	" alias");
	}
	} else {
	snprintf(cmdline, sizeof(cmdline)-1,
	"ifconfig %s %s %s/%s delete",
	nozzle->name, proto, ipaddr, prefix);
	}
	if (broadcast) {
	free(broadcast);
	}

	/*
	* temporary workaround as we port libnozzle to BSD ioctl
	* for IP address management
	*/
	err = execute_bin_sh_command(cmdline, &error_string);
	if (error_string) {
	free(error_string);
	error_string = NULL;
	}
	return err;
	#endif
	}

	/*
	* Exported public API
	*/

	nozzle_t nozzle_open(char devname, size_t devname_size, const char updownpath)
	{
	int savederrno = 0;
	nozzle_t nozzle = NULL;
	char *temp_mac = NULL;
	#ifdef KNET_LINUX
	struct ifreq ifr;
	#endif
	#ifdef KNET_BSD
	uint16_t i;
	long int nozzlenum = 0;
	char curnozzle[IFNAMSIZ];
	#endif

	if (devname == NULL) {
	errno = EINVAL;
	return NULL;
	}

	if (devname_size < IFNAMSIZ) {
	errno = EINVAL;
	return NULL;
	}

	if (strlen(devname) > IFNAMSIZ) {
	errno = E2BIG;
	return NULL;
	}

	#ifdef KNET_BSD
	/*
	* BSD does not support named devices like Linux
	* but it is possible to force a nozzleX device number
	* where X is 0 to 255.
	*/
	if (strlen(devname)) {
	if (strncmp(devname, "tap", 3)) {
	errno = EINVAL;
	return NULL;
	}
	errno = 0;
	nozzlenum = strtol(devname+3, NULL, 10);
	if (errno) {
	errno = EINVAL;
	return NULL;
	}
	if ((nozzlenum < 0) \|\| (nozzlenum > 255)) {
	errno = EINVAL;
	return NULL;
	}
	}
	#endif

	if (updownpath) {
	/* only absolute paths */
	if (updownpath[0] != '/') {
	errno = EINVAL;
	return NULL;
	}
	if (strlen(updownpath) >= UPDOWN_PATH_MAX) {
	errno = E2BIG;
	return NULL;
	}
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return NULL;
	}

	if (!lib_init) {
	lib_cfg.head = NULL;
	#ifdef KNET_LINUX
	lib_cfg.nlsock = nl_socket_alloc();
	if (!lib_cfg.nlsock) {
	savederrno = errno;
	goto out_error;
	}
	if (nl_connect(lib_cfg.nlsock, NETLINK_ROUTE) < 0) {
	savederrno = EBUSY;
	goto out_error;
	}
	lib_cfg.ioctlfd = socket(AF_INET, SOCK_STREAM, 0);
	#endif
	#ifdef KNET_BSD
	lib_cfg.ioctlfd = socket(AF_LOCAL, SOCK_DGRAM, 0);
	#endif
	if (lib_cfg.ioctlfd < 0) {
	savederrno = errno;
	goto out_error;
	}
	lib_init = 1;
	}

	nozzle = malloc(sizeof(struct nozzle_iface));
	if (!nozzle) {
	savederrno = ENOMEM;
	goto out_error;
	}

	memset(nozzle, 0, sizeof(struct nozzle_iface));

	#ifdef KNET_BSD
	if (!strlen(devname)) {
	for (i = 0; i < 256; i++) {
	snprintf(curnozzle, sizeof(curnozzle) - 1, "/dev/tap%u", i);
	nozzle->fd = open(curnozzle, O_RDWR);
	savederrno = errno;
	if (nozzle->fd > 0) {
	break;
	}
	}
	snprintf(curnozzle, sizeof(curnozzle) -1 , "tap%u", i);
	} else {
	snprintf(curnozzle, sizeof(curnozzle) - 1, "/dev/%s", devname);
	nozzle->fd = open(curnozzle, O_RDWR);
	savederrno = errno;
	snprintf(curnozzle, sizeof(curnozzle) - 1, "%s", devname);
	}
	if (nozzle->fd < 0) {
	savederrno = EBUSY;
	goto out_error;
	}
	strncpy(devname, curnozzle, IFNAMSIZ);
	strncpy(nozzle->name, curnozzle, IFNAMSIZ);
	#endif

	#ifdef KNET_LINUX
	if ((nozzle->fd = open("/dev/net/tun", O_RDWR)) < 0) {
	savederrno = errno;
	goto out_error;
	}

	memset(&ifr, 0, sizeof(struct ifreq));
	memmove(ifname, devname, IFNAMSIZ);
	ifr.ifr_flags = IFF_TAP \| IFF_NO_PI;

	if (ioctl(nozzle->fd, TUNSETIFF, &ifr) < 0) {
	savederrno = errno;
	goto out_error;
	}

	if ((strlen(devname) > 0) && (strcmp(devname, ifname) != 0)) {
	savederrno = EBUSY;
	goto out_error;
	}

	strncpy(devname, ifname, IFNAMSIZ);
	strncpy(nozzle->name, ifname, IFNAMSIZ);
	#endif

	nozzle->default_mtu = get_iface_mtu(nozzle);
	if (nozzle->default_mtu < 0) {
	savederrno = errno;
	goto out_error;
	}

	if (get_iface_mac(nozzle, &temp_mac) < 0) {
	savederrno = errno;
	goto out_error;
	}

	strncpy(nozzle->default_mac, temp_mac, 18);
	free(temp_mac);

	if (updownpath) {
	int len = strlen(updownpath);

	strcpy(nozzle->updownpath, updownpath);
	if (nozzle->updownpath[len-1] != '/') {
	nozzle->updownpath[len] = '/';
	}
	nozzle->hasupdown = 1;
	}

	nozzle->next = lib_cfg.head;
	lib_cfg.head = nozzle;

	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return nozzle;

	out_error:
	destroy_iface(nozzle);
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return NULL;
	}

	int nozzle_close(nozzle_t nozzle)
	{
	int err = 0, savederrno = 0;
	nozzle_t temp = lib_cfg.head;
	nozzle_t prev = lib_cfg.head;
	struct nozzle_ip ip, ip_next;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	while ((temp) && (temp != nozzle)) {
	prev = temp;
	temp = temp->next;
	}

	if (nozzle == prev) {
	lib_cfg.head = nozzle->next;
	} else {
	prev->next = nozzle->next;
	}

	ip = nozzle->ip;
	while (ip) {
	ip_next = ip->next;
	free(ip);
	ip = ip_next;
	}

	destroy_iface(nozzle);

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_run_updown(const nozzle_t nozzle, uint8_t action, char **exec_string)
	{
	int err = 0, savederrno = 0;
	char command[PATH_MAX];
	const char *action_str = NULL;
	struct stat sb;

	if (action > NOZZLE_POSTDOWN) {
	errno = EINVAL;
	return -1;
	}

	if (!exec_string) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	if (!nozzle->hasupdown) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	switch(action) {
	case NOZZLE_PREUP:
	action_str = "pre-up.d";
	break;
	case NOZZLE_UP:
	action_str = "up.d";
	break;
	case NOZZLE_DOWN:
	action_str = "down.d";
	break;
	case NOZZLE_POSTDOWN:
	action_str = "post-down.d";
	break;
	}

	memset(command, 0, PATH_MAX);

	snprintf(command, PATH_MAX, "%s/%s/%s", nozzle->updownpath, action_str, nozzle->name);

	err = stat(command, &sb);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	/*
	* clear errno from previous calls as there is no errno
	* returned from execute_bin_sh_command
	*/
	savederrno = 0;
	err = execute_bin_sh_command(command, exec_string);
	if (err) {
	err = -2;
	}

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_set_up(nozzle_t nozzle)
	{
	int err = 0, savederrno = 0;
	struct ifreq ifr;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	if (nozzle->up) {
	goto out_clean;
	}

	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);

	err = ioctl(lib_cfg.ioctlfd, SIOCGIFFLAGS, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	ifr.ifr_flags \|= IFF_UP \| IFF_RUNNING;
	err = ioctl(lib_cfg.ioctlfd, SIOCSIFFLAGS, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	nozzle->up = 1;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_set_down(nozzle_t nozzle)
	{
	int err = 0, savederrno = 0;
	struct ifreq ifr;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	if (!nozzle->up) {
	goto out_clean;
	}

	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);

	err = ioctl(lib_cfg.ioctlfd, SIOCGIFFLAGS, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	ifr.ifr_flags &= ~IFF_UP;

	err = ioctl(lib_cfg.ioctlfd, SIOCSIFFLAGS, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	nozzle->up = 0;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_get_mtu(const nozzle_t nozzle)
	{
	int err = 0, savederrno = 0;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	err = get_iface_mtu(nozzle);
	savederrno = errno;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	- savederrno = errno;
	+ errno = savederrno;
	return err;
	}

	int nozzle_get_mac(const nozzle_t nozzle, char **ether_addr)
	{
	int err = 0, savederrno = 0;

	if (!ether_addr) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	err = get_iface_mac(nozzle, ether_addr);

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_set_mac(nozzle_t nozzle, const char *ether_addr)
	{
	int err = 0, savederrno = 0;
	struct ifreq ifr;

	if (!ether_addr) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);
	#ifdef KNET_LINUX
	err = ioctl(lib_cfg.ioctlfd, SIOCGIFHWADDR, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	memmove(ifr.ifr_hwaddr.sa_data, ether_aton(ether_addr), ETH_ALEN);

	err = ioctl(lib_cfg.ioctlfd, SIOCSIFHWADDR, &ifr);
	savederrno = errno;
	#endif
	#ifdef KNET_BSD
	err = ioctl(lib_cfg.ioctlfd, SIOCGIFADDR, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	memmove(ifr.ifr_addr.sa_data, ether_aton(ether_addr), ETHER_ADDR_LEN);
	ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;

	err = ioctl(lib_cfg.ioctlfd, SIOCSIFLLADDR, &ifr);
	savederrno = errno;
	#endif
	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_reset_mac(nozzle_t nozzle)
	{
	return nozzle_set_mac(nozzle, nozzle->default_mac);
	}

	nozzle_t nozzle_get_handle_by_name(const char *devname)
	{
	int savederrno = 0;
	nozzle_t nozzle;

	if ((devname == NULL) \|\| (strlen(devname) > IFNAMSIZ)) {
	errno = EINVAL;
	return NULL;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return NULL;
	}

	nozzle = lib_cfg.head;
	while (nozzle != NULL) {
	if (!strcmp(devname, nozzle->name))
	break;
	nozzle = nozzle->next;
	}

	if (!nozzle) {
	savederrno = ENOENT;
	}

	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return nozzle;
	}

	const char *nozzle_get_name_by_handle(const nozzle_t nozzle)
	{
	int savederrno = 0;
	char *name = NULL;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return NULL;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = ENOENT;
	goto out_clean;
	}

	name = nozzle->name;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return name;
	}

	int nozzle_get_fd(const nozzle_t nozzle)
	{
	int fd = -1, savederrno = 0;

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = ENOENT;
	fd = -1;
	goto out_clean;
	}

	fd = nozzle->fd;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return fd;
	}

	int nozzle_set_mtu(nozzle_t nozzle, const int mtu)
	{
	int err = 0, savederrno = 0;
	struct nozzle_ip *tmp_ip;
	struct ifreq ifr;

	if (!mtu) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	err = nozzle->current_mtu = get_iface_mtu(nozzle);
	if (err < 0) {
	savederrno = errno;
	goto out_clean;
	}

	memset(&ifr, 0, sizeof(struct ifreq));
	strncpy(ifname, nozzle->name, IFNAMSIZ);
	ifr.ifr_mtu = mtu;

	err = ioctl(lib_cfg.ioctlfd, SIOCSIFMTU, &ifr);
	if (err) {
	savederrno = errno;
	goto out_clean;
	}

	if ((nozzle->current_mtu < 1280) && (mtu >= 1280)) {
	tmp_ip = nozzle->ip;
	while(tmp_ip) {
	if (tmp_ip->domain == AF_INET6) {
	err = _set_ip(nozzle, IP_ADD, tmp_ip->ipaddr, tmp_ip->prefix, 0);
	if (err) {
	savederrno = errno;
	err = -1;
	goto out_clean;
	}
	}
	tmp_ip = tmp_ip->next;
	}
	}

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_reset_mtu(nozzle_t nozzle)
	{
	return nozzle_set_mtu(nozzle, nozzle->default_mtu);
	}

	int nozzle_add_ip(nozzle_t nozzle, const char ipaddr, const char prefix)
	{
	int err = 0, savederrno = 0;
	int found = 0;
	struct nozzle_ip ip = NULL, ip_prev = NULL, *ip_last = NULL;
	int secondary = 0;

	if ((!ipaddr) \|\| (!prefix)) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	found = find_ip(nozzle, ipaddr, prefix, &ip, &ip_prev);
	if (found) {
	goto out_clean;
	}

	ip = malloc(sizeof(struct nozzle_ip));
	if (!ip) {
	savederrno = errno;
	err = -1 ;
	goto out_clean;
	}

	memset(ip, 0, sizeof(struct nozzle_ip));
	strncpy(ip->ipaddr, ipaddr, IPADDR_CHAR_MAX);
	strncpy(ip->prefix, prefix, PREFIX_CHAR_MAX);
	if (!strchr(ip->ipaddr, ':')) {
	ip->domain = AF_INET;
	} else {
	ip->domain = AF_INET6;
	}

	/*
	* if user asks for an IPv6 address, but MTU < 1280
	* store the IP and bring it up later if and when MTU > 1280
	*/
	if ((ip->domain == AF_INET6) && (get_iface_mtu(nozzle) < 1280)) {
	err = 0;
	} else {
	if (nozzle->ip) {
	secondary = 1;
	}
	err = _set_ip(nozzle, IP_ADD, ipaddr, prefix, secondary);
	savederrno = errno;
	}

	if (err) {
	free(ip);
	goto out_clean;
	}

	if (nozzle->ip) {
	ip_last = nozzle->ip;
	while (ip_last->next != NULL) {
	ip_last = ip_last->next;
	}
	ip_last->next = ip;
	} else {
	nozzle->ip = ip;
	}

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_del_ip(nozzle_t nozzle, const char ipaddr, const char prefix)
	{
	int err = 0, savederrno = 0;
	int found = 0;
	struct nozzle_ip ip = NULL, ip_prev = NULL;

	if ((!ipaddr) \|\| (!prefix)) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	savederrno = EINVAL;
	err = -1;
	goto out_clean;
	}

	found = find_ip(nozzle, ipaddr, prefix, &ip, &ip_prev);
	if (!found) {
	goto out_clean;
	}

	/*
	* if user asks for an IPv6 address, but MTU < 1280
	* the IP might not be configured on the interface and we only need to
	* remove it from our internal database
	*/
	if ((ip->domain == AF_INET6) && (get_iface_mtu(nozzle) < 1280)) {
	err = 0;
	} else {
	err = _set_ip(nozzle, IP_DEL, ipaddr, prefix, 0);
	savederrno = errno;
	}

	if (!err) {
	if (ip == ip_prev) {
	nozzle->ip = ip->next;
	} else {
	ip_prev->next = ip->next;
	}
	free(ip);
	}

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

	int nozzle_get_ips(const nozzle_t nozzle, struct nozzle_ip **nozzle_ip)
	{
	int err = 0, savederrno = 0;

	if (!nozzle_ip) {
	errno = EINVAL;
	return -1;
	}

	savederrno = pthread_mutex_lock(&config_mutex);
	if (savederrno) {
	errno = savederrno;
	return -1;
	}

	if (!is_valid_nozzle(nozzle)) {
	err = -1;
	savederrno = EINVAL;
	goto out_clean;
	}

	*nozzle_ip = nozzle->ip;

	out_clean:
	pthread_mutex_unlock(&config_mutex);
	errno = savederrno;
	return err;
	}

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