imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 1453 insertions, 0 deletions

diff --git a/release/src/router/busybox/networking/ifupdown.c b/release/src/router/busybox/networking/ifupdown.c
new file mode 100644
index 00000000..bae9f4ea
--- /dev/null
+++ b/release/src/router/busybox/networking/ifupdown.c
@@ -0,0 +1,1453 @@
+/* vi: set sw=4 ts=4: */
+/*
+ *  ifupdown for busybox
+ *  Copyright (c) 2002 Glenn McGrath <bug1@optushome.com.au>
+ *  Copyright (c) 2003 Erik Andersen <andersen@codepoet.org>
+ *
+ *  Based on ifupdown v 0.6.4 by Anthony Towns
+ *  Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
+ *
+ *  Changes to upstream version
+ *  Remove checks for kernel version, assume kernel version 2.2.0 or better.
+ *  Lines in the interfaces file cannot wrap.
+ *  To adhere to the FHS, the default state file is /var/run/ifstate.
+ *
+ *  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 2 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, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include <sys/wait.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <getopt.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "libbb.h"
+
+#define MAX_OPT_DEPTH 10
+#define EUNBALBRACK 10001
+#define EUNDEFVAR   10002
+#define EUNBALPER   10000
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+#define MAX_INTERFACE_LENGTH 10
+#endif
+
+#if 0
+#define debug_noise(fmt, args...) printf(fmt, ## args)
+#else
+#define debug_noise(fmt, args...) 
+#endif
+
+/* Forward declaration */
+struct interface_defn_t;
+
+typedef int (execfn)(char *command);
+typedef int (command_set)(struct interface_defn_t *ifd, execfn *e);
+
+extern llist_t *llist_add_to_end(llist_t *list_head, char *data)
+{
+	llist_t *new_item, *tmp, *prev;
+
+	new_item = xmalloc(sizeof(llist_t));
+	new_item->data = data;
+	new_item->link = NULL;
+	
+	prev = NULL;
+	tmp = list_head;
+	while(tmp) {
+		prev = tmp;
+		tmp = tmp->link;
+	}
+	if (prev) {
+		prev->link = new_item; 
+	} else {
+		list_head = new_item;
+	}
+
+	return(list_head);
+}
+
+struct method_t
+{
+	char *name;
+	command_set *up;
+	command_set *down;
+};
+
+struct address_family_t
+{
+	char *name;
+	int n_methods;
+	struct method_t *method;
+};
+
+struct mapping_defn_t
+{
+	struct mapping_defn_t *next;
+
+	int max_matches;
+	int n_matches;
+	char **match;
+
+	char *script;
+
+	int max_mappings;
+	int n_mappings;
+	char **mapping;
+};
+
+struct variable_t
+{
+	char *name;
+	char *value;
+};
+
+struct interface_defn_t 
+{
+	struct interface_defn_t *prev;
+	struct interface_defn_t *next;
+
+	char *iface;
+	struct address_family_t *address_family;
+	struct method_t *method;
+
+	int automatic;
+
+	int max_options;
+	int n_options;
+	struct variable_t *option;
+};
+
+struct interfaces_file_t
+{
+	llist_t *autointerfaces;
+	llist_t *ifaces;
+	struct mapping_defn_t *mappings;
+};
+
+static char no_act = 0;
+static char verbose = 0;
+static char **environ = NULL;
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+
+static unsigned int count_bits(unsigned int a)
+{
+	unsigned int result;
+	result = (a & 0x55) + ((a >> 1) & 0x55);
+	result = (result & 0x33) + ((result >> 2) & 0x33);
+	return((result & 0x0F) + ((result >> 4) & 0x0F));
+}
+
+static int count_netmask_bits(char *dotted_quad)
+{
+	unsigned int result, a, b, c, d;
+	/* Found a netmask...  Check if it is dotted quad */
+	if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
+		return -1;
+	result = count_bits(a);
+	result += count_bits(b);
+	result += count_bits(c);
+	result += count_bits(d);
+	return ((int)result);
+}
+#endif
+
+static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
+{
+	if (*pos + str_length >= *len) {
+		char *newbuf;
+
+		newbuf = xrealloc(*buf, *len * 2 + str_length + 1);
+		*buf = newbuf;
+		*len = *len * 2 + str_length + 1;
+	}
+
+	while (str_length-- >= 1) {
+		(*buf)[(*pos)++] = *str;
+		str++;
+	}
+	(*buf)[*pos] = '\0';
+}
+
+static int strncmpz(char *l, char *r, size_t llen)
+{
+	int i = strncmp(l, r, llen);
+
+	if (i == 0) {
+		return(-r[llen]);
+	} else {
+		return(i);
+	}
+}
+
+static char *get_var(char *id, size_t idlen, struct interface_defn_t *ifd)
+{
+	int i;
+
+	if (strncmpz(id, "iface", idlen) == 0) {
+		char *result;
+		static char label_buf[20];
+		strncpy(label_buf, ifd->iface, 19);
+		label_buf[19]=0;
+		result = strchr(label_buf, ':');
+		if (result) {
+			*result=0;
+		}
+		return( label_buf);
+	} else if (strncmpz(id, "label", idlen) == 0) {
+		return (ifd->iface);
+	} else {
+		for (i = 0; i < ifd->n_options; i++) {
+			if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
+				return (ifd->option[i].value);
+			}
+		}
+	}
+
+	return(NULL);
+}
+
+static char *parse(char *command, struct interface_defn_t *ifd)
+{
+
+	char *result = NULL;
+	size_t pos = 0, len = 0;
+	size_t old_pos[MAX_OPT_DEPTH] = { 0 };
+	int okay[MAX_OPT_DEPTH] = { 1 };
+	int opt_depth = 1;
+
+	while (*command) {
+		switch (*command) {
+
+			default:
+				addstr(&result, &len, &pos, command, 1);
+				command++;
+				break;
+			case '\\':
+				if (command[1]) {
+					addstr(&result, &len, &pos, command + 1, 1);
+					command += 2;
+				} else {
+					addstr(&result, &len, &pos, command, 1);
+					command++;
+				}
+				break;
+			case '[':
+				if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
+					old_pos[opt_depth] = pos;
+					okay[opt_depth] = 1;
+					opt_depth++;
+					command += 2;
+				} else {
+					addstr(&result, &len, &pos, "[", 1);
+					command++;
+				}
+				break;
+			case ']':
+				if (command[1] == ']' && opt_depth > 1) {
+					opt_depth--;
+					if (!okay[opt_depth]) {
+						pos = old_pos[opt_depth];
+						result[pos] = '\0';
+					}
+					command += 2;
+				} else {
+					addstr(&result, &len, &pos, "]", 1);
+					command++;
+				}
+				break;
+			case '%':
+				{
+					char *nextpercent;
+					char *varvalue;
+
+					command++;
+					nextpercent = strchr(command, '%');
+					if (!nextpercent) {
+						errno = EUNBALPER;
+						free(result);
+						return (NULL);
+					}
+
+					varvalue = get_var(command, nextpercent - command, ifd);
+
+					if (varvalue) {
+						addstr(&result, &len, &pos, varvalue, bb_strlen(varvalue));
+					} else {
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+						/* Sigh...  Add a special case for 'ip' to convert from
+						 * dotted quad to bit count style netmasks.  */
+						if (strncmp(command, "bnmask", 6)==0) {
+							int res;
+							varvalue = get_var("netmask", 7, ifd);
+							if (varvalue && (res=count_netmask_bits(varvalue)) > 0) {
+								char argument[255];
+								sprintf(argument, "%d", res);
+								addstr(&result, &len, &pos, argument, bb_strlen(argument));
+								command = nextpercent + 1;
+								break;
+							}
+						}
+#endif
+						okay[opt_depth - 1] = 0;
+					}
+
+					command = nextpercent + 1;
+				}
+				break;
+		}
+	}
+
+	if (opt_depth > 1) {
+		errno = EUNBALBRACK;
+		free(result);
+		return(NULL);
+	}
+
+	if (!okay[0]) {
+		errno = EUNDEFVAR;
+		free(result);
+		return(NULL);
+	}
+
+	return(result);
+}
+
+static int execute(char *command, struct interface_defn_t *ifd, execfn *exec)
+{
+	char *out;
+	int ret;
+
+	out = parse(command, ifd);
+	if (!out) {
+		return(0);
+	}
+	ret = (*exec) (out);
+
+	free(out);
+	return(1);
+}
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPX
+static int static_up_ipx(struct interface_defn_t *ifd, execfn *exec)
+{
+	return(execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec));
+}
+
+static int static_down_ipx(struct interface_defn_t *ifd, execfn *exec)
+{
+	return(execute("ipx_interface del %iface% %frame%", ifd, exec));
+}
+
+static int dynamic_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	return(execute("ipx_interface add %iface% %frame%", ifd, exec));
+}
+
+static int dynamic_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	return(execute("ipx_interface del %iface% %frame%", ifd, exec));
+}
+
+static struct method_t methods_ipx[] = {
+	{ "dynamic", dynamic_up, dynamic_down, },
+	{ "static", static_up_ipx, static_down_ipx, },
+};
+
+struct address_family_t addr_ipx = {
+	"ipx",
+	sizeof(methods_ipx) / sizeof(struct method_t),
+	methods_ipx
+};
+#endif /* IFUP_FEATURE_IPX */
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
+static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	int result;
+	result =execute("ip addr add ::1 dev %iface% label %label%", ifd, exec);
+	result += execute("ip link set %iface% up", ifd, exec);
+	return( result);
+#else
+	return( execute("ifconfig %iface% add ::1", ifd, exec));
+#endif
+}
+
+static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	return(execute("ip link set %iface% down", ifd, exec));
+#else
+	return(execute("ifconfig %iface% del ::1", ifd, exec));
+#endif
+}
+
+static int static_up6(struct interface_defn_t *ifd, execfn *exec)
+{
+	int result;
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	result = execute("ip addr add %address%/%netmask% dev %iface% label %label%", ifd, exec);
+	result += execute("ip link set %iface% up", ifd, exec);
+	result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
+#else
+	result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
+	result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
+	result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
+#endif
+	return( result);
+}
+
+static int static_down6(struct interface_defn_t *ifd, execfn *exec)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	return(execute("ip link set %iface% down", ifd, exec));
+#else
+	return(execute("ifconfig %iface% down", ifd, exec));
+#endif
+}
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	int result;
+	result = execute("ip tunnel add %iface% mode sit remote "
+				"%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
+	result += execute("ip link set %iface% up", ifd, exec);
+	result += execute("ip addr add %address%/%netmask% dev %iface% label %label%", ifd, exec);
+	result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
+	return( result);
+}
+
+static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
+{
+	return( execute("ip tunnel del %iface%", ifd, exec));
+}
+#endif
+
+static struct method_t methods6[] = {
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	{ "v4tunnel", v4tunnel_up, v4tunnel_down, },
+#endif
+	{ "static", static_up6, static_down6, },
+	{ "loopback", loopback_up6, loopback_down6, },
+};
+
+struct address_family_t addr_inet6 = {
+	"inet6",
+	sizeof(methods6) / sizeof(struct method_t),
+	methods6
+};
+#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
+static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	int result;
+	result = execute("ip addr add 127.0.0.1/8 dev %iface% label %label%", ifd, exec);
+	result += execute("ip link set %iface% up", ifd, exec);
+	return(result);
+#else
+	return( execute("ifconfig %iface% 127.0.0.1 up", ifd, exec));
+#endif
+}
+
+static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	int result;
+	result = execute("ip addr flush dev %iface%", ifd, exec);
+	result += execute("ip link set %iface% down", ifd, exec);
+	return(result);
+#else
+	return( execute("ifconfig %iface% 127.0.0.1 down", ifd, exec));
+#endif
+}
+
+static int static_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	int result;
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
+			"dev %iface% label %label%", ifd, exec);
+	result += execute("ip link set %iface% up", ifd, exec);
+	result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
+#else
+	result = execute("ifconfig %iface% %address% netmask %netmask% "
+				"[[broadcast %broadcast%]] 	[[pointopoint %pointopoint%]] "
+				"[[media %media%]] [[mtu %mtu%]] 	[[hw %hwaddress%]] up",
+				ifd, exec);
+	result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
+#endif
+	return(result);
+}
+
+static int static_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	int result;
+#ifdef CONFIG_FEATURE_IFUPDOWN_IP
+	result = execute("ip addr flush dev %iface%", ifd, exec);
+	result += execute("ip link set %iface% down", ifd, exec);
+#else
+	result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
+	result += execute("ifconfig %iface% down", ifd, exec);
+#endif
+	return(result);
+}
+
+static int execable(char *program)
+{
+	struct stat buf;
+	if (0 == stat(program, &buf)) {
+		if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) {
+			return(1);
+		}
+	}
+	return(0);
+}
+
+static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	if (execable("/sbin/udhcpc")) {
+		return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i "
+					"%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec));
+	} else if (execable("/sbin/pump")) {
+		return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec));
+	} else if (execable("/sbin/dhclient")) {
+		return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec));
+	} else if (execable("/sbin/dhcpcd")) {
+		return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] "
+					"[[-l %leasetime%]] %iface%", ifd, exec));
+	}
+	return(0);
+}
+
+static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	int result = 0;
+	if (execable("/sbin/udhcpc")) {
+		execute("kill -9 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
+	} else if (execable("/sbin/pump")) {
+		result = execute("pump -i %iface% -k", ifd, exec);
+	} else if (execable("/sbin/dhclient")) {
+		execute("kill -9 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
+	} else if (execable("/sbin/dhcpcd")) {
+		result = execute("dhcpcd -k %iface%", ifd, exec);
+	}
+	return (result || execute("ifconfig %iface% down", ifd, exec));
+}
+
+static int bootp_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("bootpc [[--bootfile %bootfile%]] --dev %iface% "
+				"[[--server %server%]] [[--hwaddr %hwaddr%]] "
+				"--returniffail --serverbcast", ifd, exec));
+}
+
+static int bootp_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("ifconfig down %iface%", ifd, exec));
+}
+
+static int ppp_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("pon [[%provider%]]", ifd, exec));
+}
+
+static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("poff [[%provider%]]", ifd, exec));
+}
+
+static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
+				"-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec));
+}
+
+static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
+{
+	return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial "
+				"-p /var/run/wvdial.%iface% -s 2", ifd, exec));
+}
+
+static struct method_t methods[] = 
+{
+	{ "wvdial", wvdial_up, wvdial_down, },
+	{ "ppp", ppp_up, ppp_down, },
+	{ "static", static_up, static_down, },
+	{ "bootp", bootp_up, bootp_down, },
+	{ "dhcp", dhcp_up, dhcp_down, },
+	{ "loopback", loopback_up, loopback_down, },
+};
+
+struct address_family_t addr_inet = 
+{
+	"inet",
+	sizeof(methods) / sizeof(struct method_t),
+	methods
+};
+
+#endif	/* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
+
+static char *next_word(char **buf)
+{
+	unsigned short length;
+	char *word;
+
+	if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) {
+		return NULL;
+	}
+
+	/* Skip over leading whitespace */
+	word = *buf;
+	while (isspace(*word)) {
+		++word;
+	}
+
+	/* Skip over comments */
+	if (*word == '#') {
+		return(NULL);
+	}
+
+	/* Find the length of this word */
+	length = strcspn(word, " \t\n");
+	if (length == 0) {
+		return(NULL);
+	}
+	*buf = word + length;
+	/*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
+	if (**buf) {
+		**buf = '\0';
+		(*buf)++;
+	}
+
+	return word;
+}
+
+static struct address_family_t *get_address_family(struct address_family_t *af[], char *name)
+{
+	int i;
+
+	for (i = 0; af[i]; i++) {
+		if (strcmp(af[i]->name, name) == 0) {
+			return af[i];
+		}
+	}
+	return NULL;
+}
+
+static struct method_t *get_method(struct address_family_t *af, char *name)
+{
+	int i;
+
+	for (i = 0; i < af->n_methods; i++) {
+		if (strcmp(af->method[i].name, name) == 0) {
+			return &af->method[i];
+		}
+	}
+	return(NULL);
+}
+
+static int duplicate_if(struct interface_defn_t *ifa, struct interface_defn_t *ifb)
+{
+	if (strcmp(ifa->iface, ifb->iface) != 0) {
+		return(0);
+	}
+	if (ifa->address_family != ifb->address_family) {
+		return(0);
+	}
+	return(1);
+}
+
+static const llist_t *find_list_string(const llist_t *list, const char *string)
+{
+	while (list) {
+		if (strcmp(list->data, string) == 0) {
+			return(list);
+		}
+		list = list->link;
+	}
+	return(NULL);
+}
+
+static struct interfaces_file_t *read_interfaces(char *filename)
+{
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+	struct mapping_defn_t *currmap = NULL;
+#endif
+	struct interface_defn_t *currif = NULL;
+	struct interfaces_file_t *defn;
+	FILE *f;
+	char *firstword;
+	char *buf;
+
+	enum { NONE, IFACE, MAPPING } currently_processing = NONE;
+
+	defn = xmalloc(sizeof(struct interfaces_file_t));
+	defn->autointerfaces = NULL;
+	defn->mappings = NULL;
+	defn->ifaces = NULL;
+
+	f = bb_xfopen(filename, "r");
+
+	while ((buf = bb_get_chomped_line_from_file(f)) != NULL) {
+		char *buf_ptr = buf;
+
+		firstword = next_word(&buf_ptr);
+		if (firstword == NULL) {
+			free(buf);
+			continue;	/* blank line */
+		}
+
+		if (strcmp(firstword, "mapping") == 0) {
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+			currmap = xmalloc(sizeof(struct mapping_defn_t));
+			currmap->max_matches = 0;
+			currmap->n_matches = 0;
+			currmap->match = NULL;
+
+			while ((firstword = next_word(&buf_ptr)) != NULL) {
+				if (currmap->max_matches == currmap->n_matches) {
+					currmap->max_matches = currmap->max_matches * 2 + 1;
+					currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches);
+				}
+
+				currmap->match[currmap->n_matches++] = bb_xstrdup(firstword);
+			}
+			currmap->max_mappings = 0;
+			currmap->n_mappings = 0;
+			currmap->mapping = NULL;
+			currmap->script = NULL;
+			{
+				struct mapping_defn_t **where = &defn->mappings;
+				while (*where != NULL) {
+					where = &(*where)->next;
+				}
+				*where = currmap;
+				currmap->next = NULL;
+			}
+			debug_noise("Added mapping\n");
+#endif
+			currently_processing = MAPPING;
+		} else if (strcmp(firstword, "iface") == 0) {
+			{
+				char *iface_name;
+				char *address_family_name;
+				char *method_name;
+				struct address_family_t *addr_fams[] = {
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
+					&addr_inet,
+#endif
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
+					&addr_inet6,
+#endif
+#ifdef CONFIG_FEATURE_IFUPDOWN_IPX
+					&addr_ipx,
+#endif
+					NULL
+				};
+
+				currif = xmalloc(sizeof(struct interface_defn_t));
+				iface_name = next_word(&buf_ptr);
+				address_family_name = next_word(&buf_ptr);
+				method_name = next_word(&buf_ptr);
+
+				if (buf_ptr == NULL) {
+					bb_error_msg("too few parameters for line \"%s\"", buf);
+					return NULL;
+				}
+
+				/* ship any trailing whitespace */
+				while (isspace(*buf_ptr)) {
+					++buf_ptr;
+				}
+
+				if (buf_ptr[0] != '\0') {
+					bb_error_msg("too many parameters \"%s\"", buf);
+					return NULL;
+				}
+
+				currif->iface = bb_xstrdup(iface_name);
+
+				currif->address_family = get_address_family(addr_fams, address_family_name);
+				if (!currif->address_family) {
+					bb_error_msg("unknown address type \"%s\"", buf);
+					return NULL;
+				}
+
+				currif->method = get_method(currif->address_family, method_name);
+				if (!currif->method) {
+					bb_error_msg("unknown method \"%s\"", buf);
+					return NULL;
+				}
+
+				currif->automatic = 1;
+				currif->max_options = 0;
+				currif->n_options = 0;
+				currif->option = NULL;
+
+				{
+					struct interface_defn_t *tmp;
+					llist_t *iface_list;
+					iface_list = defn->ifaces;
+					while (iface_list) {
+						tmp = (struct interface_defn_t *) iface_list->data;
+						if (duplicate_if(tmp, currif)) {
+							bb_error_msg("duplicate interface \"%s\"", tmp->iface);
+							return NULL;
+						}
+						iface_list = iface_list->link;
+					}
+
+					defn->ifaces = llist_add_to_end(defn->ifaces, (char*)currif);
+				}
+				debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
+			}
+			currently_processing = IFACE;
+		} else if (strcmp(firstword, "auto") == 0) {
+			while ((firstword = next_word(&buf_ptr)) != NULL) {
+
+				/* Check the interface isnt already listed */
+				if (find_list_string(defn->autointerfaces, firstword)) {
+					bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
+				}
+
+				/* Add the interface to the list */
+				defn->autointerfaces = llist_add_to_end(defn->autointerfaces, strdup(firstword));
+				debug_noise("\nauto %s\n", firstword);
+			}
+			currently_processing = NONE;
+		} else {
+			switch (currently_processing) {
+				case IFACE:
+					{
+						int i;
+
+						if (bb_strlen(buf_ptr) == 0) {
+							bb_error_msg("option with empty value \"%s\"", buf);
+							return NULL;
+						}
+
+						if (strcmp(firstword, "up") != 0
+								&& strcmp(firstword, "down") != 0
+								&& strcmp(firstword, "pre-up") != 0
+								&& strcmp(firstword, "post-down") != 0) {
+							for (i = 0; i < currif->n_options; i++) {
+								if (strcmp(currif->option[i].name, firstword) == 0) {
+									bb_error_msg("duplicate option \"%s\"", buf);
+									return NULL;
+								}
+							}
+						}
+					}
+					if (currif->n_options >= currif->max_options) {
+						struct variable_t *opt;
+
+						currif->max_options = currif->max_options + 10;
+						opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
+						currif->option = opt;
+					}
+					currif->option[currif->n_options].name = bb_xstrdup(firstword);
+					currif->option[currif->n_options].value = bb_xstrdup(buf_ptr);
+					if (!currif->option[currif->n_options].name) {
+						perror(filename);
+						return NULL;
+					}
+					if (!currif->option[currif->n_options].value) {
+						perror(filename);
+						return NULL;
+					}
+					debug_noise("\t%s=%s\n", currif->option[currif->n_options].name, 
+							currif->option[currif->n_options].value);
+					currif->n_options++;
+					break;
+				case MAPPING:
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+					if (strcmp(firstword, "script") == 0) {
+						if (currmap->script != NULL) {
+							bb_error_msg("duplicate script in mapping \"%s\"", buf);
+							return NULL;
+						} else {
+							currmap->script = bb_xstrdup(next_word(&buf_ptr));
+						}
+					} else if (strcmp(firstword, "map") == 0) {
+						if (currmap->max_mappings == currmap->n_mappings) {
+							currmap->max_mappings = currmap->max_mappings * 2 + 1;
+							currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
+						}
+						currmap->mapping[currmap->n_mappings] = bb_xstrdup(next_word(&buf_ptr));
+						currmap->n_mappings++;
+					} else {
+						bb_error_msg("misplaced option \"%s\"", buf);
+						return NULL;
+					}
+#endif
+					break;
+				case NONE:
+				default:
+					bb_error_msg("misplaced option \"%s\"", buf);
+					return NULL;
+			}
+		}
+		free(buf);
+	}
+	if (ferror(f) != 0) {
+		bb_perror_msg_and_die("%s", filename);
+	}
+	fclose(f);
+
+	return defn;
+}
+
+static char *setlocalenv(char *format, char *name, char *value)
+{
+	char *result;
+	char *here;
+	char *there;
+
+	result = xmalloc(bb_strlen(format) + bb_strlen(name) + bb_strlen(value) + 1);
+
+	sprintf(result, format, name, value);
+
+	for (here = there = result; *there != '=' && *there; there++) {
+		if (*there == '-')
+			*there = '_';
+		if (isalpha(*there))
+			*there = toupper(*there);
+
+		if (isalnum(*there) || *there == '_') {
+			*here = *there;
+			here++;
+		}
+	}
+	memmove(here, there, bb_strlen(there) + 1);
+
+	return result;
+}
+
+static void set_environ(struct interface_defn_t *iface, char *mode)
+{
+	char **environend;
+	int i;
+	const int n_env_entries = iface->n_options + 5;
+	char **ppch;
+
+	if (environ != NULL) {
+		for (ppch = environ; *ppch; ppch++) {
+			free(*ppch);
+			*ppch = NULL;
+		}
+		free(environ);
+		environ = NULL;
+	}
+	environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
+	environend = environ;
+	*environend = NULL;
+
+	for (i = 0; i < iface->n_options; i++) {
+		if (strcmp(iface->option[i].name, "up") == 0
+				|| strcmp(iface->option[i].name, "down") == 0
+				|| strcmp(iface->option[i].name, "pre-up") == 0
+				|| strcmp(iface->option[i].name, "post-down") == 0) {
+			continue;
+		}
+		*(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
+		*environend = NULL;
+	}
+
+	*(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface);
+	*environend = NULL;
+	*(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
+	*environend = NULL;
+	*(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
+	*environend = NULL;
+	*(environend++) = setlocalenv("%s=%s", "MODE", mode);
+	*environend = NULL;
+	*(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin");
+	*environend = NULL;
+}
+
+static int doit(char *str)
+{
+	if (verbose || no_act) {
+		printf("%s\n", str);
+	}
+	if (!no_act) {
+		pid_t child;
+		int status;
+
+		fflush(NULL);
+		switch (child = fork()) {
+			case -1:		/* failure */
+				return 0;
+			case 0:		/* child */
+				execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ);
+				exit(127);
+		}
+		waitpid(child, &status, 0);
+		if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+			return 0;
+		}
+	}
+	return (1);
+}
+
+static int execute_all(struct interface_defn_t *ifd, execfn *exec, const char *opt)
+{
+	int i;
+	char *buf[2];
+
+	for (i = 0; i < ifd->n_options; i++) {
+		if (strcmp(ifd->option[i].name, opt) == 0) {
+			if (!(*exec) (ifd->option[i].value)) {
+				return 0;
+			}
+		}
+	}
+
+	bb_xasprintf(&buf[0], "/etc/network/if-%s.d", opt);
+	buf[1] = NULL;
+
+	run_parts(buf, 2, environ);
+	free(buf[0]);
+	return (1);
+}
+
+static int check(char *str) {
+	return str != NULL;
+}
+
+static int iface_up(struct interface_defn_t *iface)
+{
+	int result;
+	if (!iface->method->up(iface,check)) return -1;
+	set_environ(iface, "start");
+	result = execute_all(iface, doit, "pre-up");
+	result += iface->method->up(iface, doit);
+	result += execute_all(iface, doit, "up");
+	return(result);
+}
+
+static int iface_down(struct interface_defn_t *iface)
+{
+	int result;
+	if (!iface->method->down(iface,check)) return -1;
+	set_environ(iface, "stop");
+	result = execute_all(iface, doit, "down");
+	result += iface->method->down(iface, doit);
+	result += execute_all(iface, doit, "post-down");
+	return(result);
+}
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+static int popen2(FILE **in, FILE **out, char *command, ...)
+{
+	va_list ap;
+	char *argv[11] = { command };
+	int argc;
+	int infd[2], outfd[2];
+	pid_t pid;
+
+	argc = 1;
+	va_start(ap, command);
+	while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
+		argc++;
+	}
+	argv[argc] = NULL;	/* make sure */
+	va_end(ap);
+
+	if (pipe(infd) != 0) {
+		return 0;
+	}
+
+	if (pipe(outfd) != 0) {
+		close(infd[0]);
+		close(infd[1]);
+		return 0;
+	}
+
+	fflush(NULL);
+	switch (pid = fork()) {
+		case -1:			/* failure */
+			close(infd[0]);
+			close(infd[1]);
+			close(outfd[0]);
+			close(outfd[1]);
+			return 0;
+		case 0:			/* child */
+			dup2(infd[0], 0);
+			dup2(outfd[1], 1);
+			close(infd[0]);
+			close(infd[1]);
+			close(outfd[0]);
+			close(outfd[1]);
+			execvp(command, argv);
+			exit(127);
+		default:			/* parent */
+			*in = fdopen(infd[1], "w");
+			*out = fdopen(outfd[0], "r");
+			close(infd[0]);
+			close(outfd[1]);
+			return pid;
+	}
+	/* unreached */
+}
+
+static char * run_mapping(char *physical, struct mapping_defn_t * map)
+{
+	FILE *in, *out;
+	int i, status;
+	pid_t pid;
+
+	char *logical = bb_xstrdup(physical);
+
+	/* Run the mapping script. */
+	pid = popen2(&in, &out, map->script, physical, NULL);
+
+	/* popen2() returns 0 on failure. */
+	if (pid == 0)
+		return logical;
+
+	/* Write mappings to stdin of mapping script. */
+	for (i = 0; i < map->n_mappings; i++) {
+		fprintf(in, "%s\n", map->mapping[i]);
+	}
+	fclose(in);
+	waitpid(pid, &status, 0);
+
+	if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
+		/* If the mapping script exited successfully, try to
+		 * grab a line of output and use that as the name of the
+		 * logical interface. */
+		char *new_logical = (char *)xmalloc(MAX_INTERFACE_LENGTH);
+
+		if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
+			/* If we are able to read a line of output from the script,
+			 * remove any trailing whitespace and use this value
+			 * as the name of the logical interface. */
+			char *pch = new_logical + bb_strlen(new_logical) - 1;
+
+			while (pch >= new_logical && isspace(*pch))
+				*(pch--) = '\0';
+
+			free(logical);
+			logical = new_logical;
+		} else {
+			/* If we are UNABLE to read a line of output, discard are
+			 * freshly allocated memory. */
+			free(new_logical);
+		}
+	}
+
+	fclose(out);
+
+	return logical;
+}
+#endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
+
+static llist_t *find_iface_state(llist_t *state_list, const char *iface)
+{
+	unsigned short iface_len = bb_strlen(iface);
+	llist_t *search = state_list;
+
+	while (search) {
+		if ((strncmp(search->data, iface, iface_len) == 0) &&
+				(search->data[iface_len] == '=')) {
+			return(search);
+		}
+		search = search->link;
+	}
+	return(NULL);
+}
+
+extern int ifupdown_main(int argc, char **argv)
+{
+	int (*cmds) (struct interface_defn_t *) = NULL;
+	struct interfaces_file_t *defn;
+	FILE *state_fp = NULL;
+	llist_t *state_list = NULL;
+	llist_t *target_list = NULL;
+	char *interfaces = "/etc/network/interfaces";
+	const char *statefile = "/var/run/ifstate";
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+	int run_mappings = 1;
+#endif
+	int do_all = 0;
+	int force = 0;
+	int i;
+
+	if (bb_applet_name[2] == 'u') {
+		/* ifup command */
+		cmds = iface_up;
+	} else {
+		/* ifdown command */
+		cmds = iface_down;
+	}
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+	while ((i = getopt(argc, argv, "i:hvnamf")) != -1)
+#else
+		while ((i = getopt(argc, argv, "i:hvnaf")) != -1) 
+#endif
+		{
+			switch (i) {
+				case 'i':	/* interfaces */
+					interfaces = bb_xstrdup(optarg);
+					break;
+				case 'v':	/* verbose */
+					verbose = 1;
+					break;
+				case 'a':	/* all */
+					do_all = 1;
+					break;
+				case 'n':	/* no-act */
+					no_act = 1;
+					break;
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+				case 'm':	/* no-mappings */
+					run_mappings = 0;
+					break;
+#endif
+				case 'f':	/* force */
+					force = 1;
+					break;
+				default:
+					bb_show_usage();
+					break;
+			}
+		}
+
+	if (argc - optind > 0) {
+		if (do_all) {
+			bb_show_usage();
+		}
+	} else {
+		if (!do_all) {
+			bb_show_usage();
+		}
+	}			
+
+	debug_noise("reading %s file:\n", interfaces);
+	defn = read_interfaces(interfaces);
+	debug_noise("\ndone reading %s\n\n", interfaces);
+
+	if (!defn) {
+		exit(EXIT_FAILURE);
+	}
+
+	if (no_act) {
+		state_fp = fopen(statefile, "r");
+	}
+
+	/* Create a list of interfaces to work on */
+	if (do_all) {
+		if (cmds == iface_up) {
+			target_list = defn->autointerfaces;
+		} else {
+#if 0
+			/* iface_down */
+			llist_t *new_item;
+			const llist_t *list = state_list;
+			while (list) {
+				new_item = xmalloc(sizeof(llist_t));
+				new_item->data = strdup(list->data);
+				new_item->link = NULL;
+				list = target_list;
+				if (list == NULL)
+					target_list = new_item;
+				else {
+					while (list->link) {
+						list = list->link;
+					}
+					list = new_item;
+				}
+				list = list->link;
+			}
+			target_list = defn->autointerfaces;
+#else
+
+			/* iface_down */
+			const llist_t *list = state_list;
+			while (list) {
+				target_list = llist_add_to_end(target_list, strdup(list->data));
+				list = list->link;
+			}
+			target_list = defn->autointerfaces;
+#endif	
+		} 
+	} else {
+		target_list = llist_add_to_end(target_list, argv[optind]);
+	}
+
+
+	/* Update the interfaces */
+	while (target_list) {
+		llist_t *iface_list;
+		struct interface_defn_t *currif;
+		char *iface;
+		char *liface;
+		char *pch;
+		int okay = 0;
+
+		iface = strdup(target_list->data);
+		target_list = target_list->link;
+
+		pch = strchr(iface, '=');
+		if (pch) {
+			*pch = '\0';
+			liface = strdup(pch + 1);
+		} else {
+			liface = strdup(iface);
+		}
+
+		if (!force) {
+			const llist_t *iface_state = find_iface_state(state_list, iface);
+
+			if (cmds == iface_up) {
+				/* ifup */
+				if (iface_state) {
+					bb_error_msg("interface %s already configured", iface);
+					continue;
+				}
+			} else {
+				/* ifdown */
+				if (iface_state) {
+					bb_error_msg("interface %s not configured", iface);
+					continue;
+				}
+			}
+		}
+
+#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
+		if ((cmds == iface_up) && run_mappings) {
+			struct mapping_defn_t *currmap;
+
+			for (currmap = defn->mappings; currmap; currmap = currmap->next) {
+
+				for (i = 0; i < currmap->n_matches; i++) {
+					if (fnmatch(currmap->match[i], liface, 0) != 0)
+						continue;
+					if (verbose) {
+						printf("Running mapping script %s on %s\n", currmap->script, liface);
+					}
+					liface = run_mapping(iface, currmap);
+					break;
+				}
+			}
+		}
+#endif
+
+
+		iface_list = defn->ifaces;
+		while (iface_list) {
+			currif = (struct interface_defn_t *) iface_list->data;
+			if (strcmp(liface, currif->iface) == 0) {
+				char *oldiface = currif->iface;
+
+				okay = 1;
+				currif->iface = iface;
+
+				debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
+
+				/* Call the cmds function pointer, does either iface_up() or iface_down() */
+				if (cmds(currif) == -1) {
+					bb_error_msg("Don't seem to be have all the variables for %s/%s.",
+							liface, currif->address_family->name);
+				}
+
+				currif->iface = oldiface;
+			}
+			iface_list = iface_list->link;
+		}
+		if (verbose) {
+			printf("\n");
+		}
+
+		if (!okay && !force) {
+			bb_error_msg("Ignoring unknown interface %s", liface);
+		} else {
+			llist_t *iface_state = find_iface_state(state_list, iface);
+
+			if (cmds == iface_up) {
+				char *newiface = xmalloc(bb_strlen(iface) + 1 + bb_strlen(liface) + 1);
+				sprintf(newiface, "%s=%s", iface, liface);
+				if (iface_state == NULL) {
+					state_list = llist_add_to_end(state_list, newiface);
+				} else {
+					free(iface_state->data);
+					iface_state->data = newiface;
+				}
+			} else if (cmds == iface_down) {
+				/* Remove an interface from the linked list */
+				if (iface_state) {
+					/* This needs to be done better */
+					free(iface_state->data);
+					free(iface_state->link);
+					if (iface_state->link) {
+						iface_state->data = iface_state->link->data;
+						iface_state->link = iface_state->link->link;
+					} else {
+						iface_state->data = NULL;
+						iface_state->link = NULL;
+					}						
+				}
+			}
+		}
+	}
+
+	/* Actually write the new state */
+	if (!no_act) {
+
+		if (state_fp)
+			fclose(state_fp);
+		state_fp = bb_xfopen(statefile, "a+");
+
+		if (ftruncate(fileno(state_fp), 0) < 0) {
+			bb_error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
+		}
+
+		rewind(state_fp);
+
+		while (state_list) {
+			if (state_list->data) {
+				fputs(state_list->data, state_fp);
+				fputc('\n', state_fp);
+			}
+			state_list = state_list->link;
+		}
+		fflush(state_fp);
+	}
+
+	/* Cleanup */
+	if (state_fp != NULL) {
+		fclose(state_fp);
+		state_fp = NULL;
+	}
+
+	return 0;
+}