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busybox/networking/ifupdown.c
Rob Landley b0a2d6c19d Remove code for protocols we don't properly support. (Most of this could 
never be selected via menuconfig anyway.)  If somebody wants one of these
protocols, ask on the list for us to support it _properly_.
2006-04-14 20:07:33 +00:00

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/* vi: set sw=4 ts=4: */
/*
* ifupdown for busybox
* Copyright (c) 2002 Glenn McGrath <bug1@iinet.net.au>
* Copyright (c) 2003-2004 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.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
/* TODO: standardise execute() return codes to return 0 for success and 1 for failure */
#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 "busybox.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);
struct method_t
{
char *name;
int (*up)(struct interface_defn_t *ifd, execfn *e);
int (*down)(struct interface_defn_t *ifd, execfn *e);
};
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 address_family_t *address_family;
struct method_t *method;
char *iface;
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 **__myenviron = 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
#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
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);
if (ret != 1) {
return(0);
}
return(1);
}
#endif
#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%", ifd, exec);
result += execute("ip link set %iface% up", ifd, exec);
return ((result == 2) ? 2 : 0);
#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 [[mtu %mtu%]] [[address %hwaddress%]] %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 == 3) ? 3 : 0);
}
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%", ifd, exec);
result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
return ((result == 4) ? 4 : 0);
}
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, },
};
static 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%", ifd, exec);
result += execute("ip link set %iface% up", ifd, exec);
return ((result == 2) ? 2 : 0);
#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 == 2) ? 2 : 0);
#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% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
return ((result == 3) ? 3 : 0);
#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);
return ((result == 2) ? 2 : 0);
#endif
}
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 == 2) ? 2 : 0);
}
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")) {
/* SIGUSR2 forces udhcpc to release the current lease and go inactive,
* and SIGTERM causes udhcpc to exit. Signals are queued and processed
* sequentially so we don't need to sleep */
result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
result += execute("kill -TERM `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")) {
result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec);
} else if (execable("/sbin/dhcpcd")) {
result = execute("dhcpcd -k %iface%", ifd, exec);
}
return (result || static_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 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, static_down, },
{ "dhcp", dhcp_up, dhcp_down, },
{ "loopback", loopback_up, loopback_down, },
};
static 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 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(const 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
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\"", address_family_name);
return NULL;
}
currif->method = get_method(currif->address_family, method_name);
if (!currif->method) {
bb_error_msg("unknown method \"%s\"", method_name);
return NULL;
}
currif->max_options = 0;
currif->n_options = 0;
currif->option = NULL;
{
llist_t *iface_list;
for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
if ((strcmp(tmp->iface, currif->iface) == 0) &&
(tmp->address_family == currif->address_family)) {
bb_error_msg("duplicate interface \"%s\"", tmp->iface);
return NULL;
}
}
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, bb_xstrdup(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, const char *name, const 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, const char *mode)
{
char **environend;
int i;
const int n_env_entries = iface->n_options + 5;
char **ppch;
if (__myenviron != NULL) {
for (ppch = __myenviron; *ppch; ppch++) {
free(*ppch);
*ppch = NULL;
}
free(__myenviron);
__myenviron = NULL;
}
__myenviron = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
environend = __myenviron;
*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(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron);
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, const char *opt)
{
int i;
char *buf;
for (i = 0; i < ifd->n_options; i++) {
if (strcmp(ifd->option[i].name, opt) == 0) {
if (!doit(ifd->option[i].value)) {
return 0;
}
}
}
buf = bb_xasprintf("run-parts /etc/network/if-%s.d", opt);
if (doit(buf) != 1) {
return 0;
}
return 1;
}
static int check(char *str) {
return str != NULL;
}
static int iface_up(struct interface_defn_t *iface)
{
if (!iface->method->up(iface,check)) return -1;
set_environ(iface, "start");
if (!execute_all(iface, "pre-up")) return 0;
if (!iface->method->up(iface, doit)) return 0;
if (!execute_all(iface, "up")) return 0;
return 1;
}
static int iface_down(struct interface_defn_t *iface)
{
if (!iface->method->down(iface,check)) return -1;
set_environ(iface, "stop");
if (!execute_all(iface, "down")) return 0;
if (!iface->method->down(iface, doit)) return 0;
if (!execute_all(iface, "post-down")) return 0;
return 1;
}
#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);
}
int ifupdown_main(int argc, char **argv)
{
int (*cmds) (struct interface_defn_t *) = NULL;
struct interfaces_file_t *defn;
llist_t *state_list = NULL;
llist_t *target_list = NULL;
const 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 any_failures = 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 = 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);
}
/* 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 = bb_xstrdup(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, bb_xstrdup(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;
int cmds_ret;
iface = bb_xstrdup(target_list->data);
target_list = target_list->link;
pch = strchr(iface, '=');
if (pch) {
*pch = '\0';
liface = bb_xstrdup(pch + 1);
} else {
liface = bb_xstrdup(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() */
cmds_ret = cmds(currif);
if (cmds_ret == -1) {
bb_error_msg("Don't seem to have all the variables for %s/%s.",
liface, currif->address_family->name);
any_failures += 1;
} else if (cmds_ret == 0) {
any_failures += 1;
}
currif->iface = oldiface;
}
iface_list = iface_list->link;
}
if (verbose) {
printf("\n");
}
if (!okay && !force) {
bb_error_msg("Ignoring unknown interface %s", liface);
any_failures += 1;
} 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 {
/* Remove an interface from the linked list */
if (iface_state) {
llist_t *l = iface_state->link;
free(iface_state->data);
iface_state->data = NULL;
iface_state->link = NULL;
if (l) {
iface_state->data = l->data;
iface_state->link = l->link;
}
free(l);
}
}
}
}
/* Actually write the new state */
if (!no_act) {
FILE *state_fp = NULL;
state_fp = bb_xfopen(statefile, "w");
while (state_list) {
if (state_list->data) {
fputs(state_list->data, state_fp);
fputc('\n', state_fp);
}
state_list = state_list->link;
}
fclose(state_fp);
}
if (any_failures)
return 1;
return 0;
}
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