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	diff --git a/libnozzle/libnozzle.c b/libnozzle/libnozzle.c
	index 0ea6e0c6..6cd5c634 100644
	--- a/libnozzle/libnozzle.c
	+++ b/libnozzle/libnozzle.c
	@@ -1,1142 +1,1134 @@
	/*
	* 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>
	#include <netinet/ether.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 _close(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);
	-
	- return;
	-}
	-
	-static void _close_cfg(void)
	-{
	- if (lib_cfg.head == NULL) {
	- close(lib_cfg.ioctlfd);
	- lib_init = 0;
	- }
	-}
	-
	static int _set_ip(nozzle_t nozzle, const char *command,
	const char ipaddr, const char prefix,
	char **error_string, int secondary)
	{
	char *broadcast = NULL;
	char cmdline[4096];
	#ifdef KNET_BSD
	char proto[6];
	int v4 = 1;

	snprintf(proto, sizeof(proto), "inet");
	#endif

	if (!strchr(ipaddr, ':')) {
	broadcast = generate_v4_broadcast(ipaddr, prefix);
	if (!broadcast) {
	errno = EINVAL;
	return -1;
	}
	}
	#ifdef KNET_BSD
	else {
	v4 = 0;
	snprintf(proto, sizeof(proto), "inet6");
	}
	#endif

	memset(cmdline, 0, sizeof(cmdline));

	#ifdef KNET_LINUX
	if (broadcast) {
	snprintf(cmdline, sizeof(cmdline)-1,
	"ip addr %s %s/%s dev %s broadcast %s",
	command, ipaddr, prefix,
	nozzle->name, broadcast);
	} else {
	snprintf(cmdline, sizeof(cmdline)-1,
	"ip addr %s %s/%s dev %s",
	command, ipaddr, prefix,
	nozzle->name);
	}
	#endif
	#ifdef KNET_BSD
	if (!strcmp(command, "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) && (v4)) {
	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);
	}
	#endif
	if (broadcast) {
	free(broadcast);
	}
	return execute_bin_sh_command(cmdline, error_string);
	}

	/*
	* internal helpers below should be completed
	*
	* keep all ioctl work within this file
	*/

	+static void lib_fini(void)
	+{
	+ if (lib_cfg.head == NULL) {
	+ close(lib_cfg.ioctlfd);
	+ lib_init = 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 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 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;
	}

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

	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:
	errno = savederrno;
	return err;
	}

	/*
	* 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.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) {
	- errno = 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));
	- strncpy(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)) {
	- errno = 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:
	- _close(nozzle);
	- _close_cfg();
	- 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;
	- char *error_string = NULL;
	-
	- 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;
	- }
	-
	- set_iface_down(nozzle);
	-
	- ip = nozzle->ip;
	- while (ip) {
	- ip_next = ip->next;
	- _set_ip(nozzle, "del", ip->ipaddr, ip->prefix, &error_string, 0);
	- if (error_string) {
	- free(error_string);
	- error_string = NULL;
	- }
	- free(ip);
	- ip = ip_next;
	- }
	-
	- _close(nozzle);
	- _close_cfg();
	-
	-out_clean:
	- pthread_mutex_unlock(&config_mutex);
	- errno = savederrno;
	- return err;
	-}
	-
	int nozzle_set_mtu(nozzle_t nozzle, const int mtu, char **error_string)
	{
	int err = 0, savederrno = 0;
	struct nozzle_ip *tmp_ip;
	struct ifreq ifr;

	if ((!mtu) \|\| (!error_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;
	}

	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, "add", tmp_ip->ipaddr, tmp_ip->prefix, error_string, 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, char **error_string)
	{
	return nozzle_set_mtu(nozzle, nozzle->default_mtu, error_string);
	}

	int nozzle_add_ip(nozzle_t nozzle, const char ipaddr, const char prefix, char **error_string)
	{
	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) \|\| (!error_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;
	}

	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, "add", ipaddr, prefix, error_string, 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, char **error_string)
	{
	int err = 0, savederrno = 0;
	int found = 0;
	struct nozzle_ip ip = NULL, ip_prev = NULL;

	if ((!ipaddr) \|\| (!prefix) \|\| (!error_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;
	}

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

	err = _set_ip(nozzle, "del", ipaddr, prefix, error_string, 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, char *ipaddr_list, int entries)
	{
	int err = 0, savederrno = 0;
	int found = 0;
	char *ip_list = NULL;
	int size = 0, offset = 0, len;
	struct nozzle_ip *ip = NULL;

	if ((!ipaddr_list) \|\| (!entries)) {
	errno = EINVAL;
	return -1;
	}

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

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

	ip = nozzle->ip;

	while (ip) {
	found++;
	ip = ip->next;
	}

	if (!found) {
	*ipaddr_list = NULL;
	*entries = 0;
	goto out_clean;
	}

	size = found * (IPADDR_CHAR_MAX + PREFIX_CHAR_MAX + 2);

	ip_list = malloc(size);
	if (!ip_list) {
	savederrno = errno;
	err = -1;
	goto out_clean;
	}

	memset(ip_list, 0, size);

	ip = nozzle->ip;

	while (ip) {
	len = strlen(ip->ipaddr);
	memmove(ip_list + offset, ip->ipaddr, len);
	offset = offset + len + 1;
	len = strlen(ip->prefix);
	memmove(ip_list + offset, ip->prefix, len);
	offset = offset + len + 1;
	ip = ip->next;
	}

	*ipaddr_list = ip_list;
	*entries = found;

	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;
	}

	err = execute_bin_sh_command(command, exec_string);
	savederrno = errno;

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

	/*
	* functions below should be completed
	*/

	+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.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) {
	+ errno = 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));
	+ strncpy(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)) {
	+ errno = 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_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;

	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 = set_iface_down(nozzle);
	savederrno = errno;

	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;
	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;
	}

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