blob: 37185327b68056f469deb7d339d3a14f6a744136 [file] [log] [blame]
/*
* ifupdown for busybox
* Copyright (c) 2002 Glenn McGrath <bug1@optushome.com.au>
*
* 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
typedef struct interface_defn_s interface_defn_t;
typedef int (execfn)(char *command);
typedef int (command_set)(interface_defn_t *ifd, execfn *e);
typedef struct method_s {
char *name;
command_set *up;
command_set *down;
} method_t;
typedef struct address_family_s {
char *name;
int n_methods;
method_t *method;
} address_family_t;
typedef struct mapping_defn_s {
struct mapping_defn_s *next;
int max_matches;
int n_matches;
char **match;
char *script;
int max_mappings;
int n_mappings;
char **mapping;
} mapping_defn_t;
typedef struct variable_s {
char *name;
char *value;
} variable_t;
struct interface_defn_s {
struct interface_defn_s *next;
char *iface;
address_family_t *address_family;
method_t *method;
int automatic;
int max_options;
int n_options;
variable_t *option;
};
typedef struct interfaces_file_s {
llist_t *autointerfaces;
interface_defn_t *ifaces;
mapping_defn_t *mappings;
} interfaces_file_t;
static char no_act = 0;
static char verbose = 0;
static char **environ = NULL;
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, interface_defn_t *ifd)
{
int i;
if (strncmpz(id, "iface", 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, 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, xstrlen(varvalue));
} else {
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, interface_defn_t *ifd, execfn *exec)
{
char *out;
int ret;
out = parse(command, ifd);
if (!out) {
return(0);
}
ret = (*exec) (out);
free(out);
return(ret);
}
#ifdef CONFIG_FEATURE_IFUPDOWN_IPX
static int static_up_ipx(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
return(0);
}
return(1);
}
static int static_down_ipx(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static int dynamic_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static int dynamic_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static method_t methods_ipx[] = {
{ "dynamic", dynamic_up, dynamic_down, },
{ "static", static_up_ipx, static_down_ipx, },
};
address_family_t addr_ipx = {
"ipx",
sizeof(methods_ipx) / sizeof(method_t),
methods_ipx
};
#endif /* IFUP_FEATURE_IPX */
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
static int loopback_up6(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
return(0);
}
return(1);
}
static int loopback_down6(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% del ::1", ifd, exec)) {
return(0);
}
return(1);
}
static int static_up6(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) {
return(0);
}
if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) {
return(0);
}
if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) {
return(0);
}
return(1);
}
static int static_down6(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% down", ifd, exec)) {
return(0);
}
return(1);
}
static int v4tunnel_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) {
return(0);
}
if (!execute("ip link set %iface% up", ifd, exec)) {
return(0);
}
if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) {
return(0);
}
if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) {
return(0);
}
return(1);
}
static int v4tunnel_down(interface_defn_t * ifd, execfn * exec)
{
if (!execute("ip tunnel del %iface%", ifd, exec)) {
return(0);
}
return(1);
}
static method_t methods6[] = {
{ "v4tunnel", v4tunnel_up, v4tunnel_down, },
{ "static", static_up6, static_down6, },
{ "loopback", loopback_up6, loopback_down6, },
};
address_family_t addr_inet6 = {
"inet6",
sizeof(methods6) / sizeof(method_t),
methods6
};
#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
static int loopback_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
return(0);
}
return(1);
}
static int loopback_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% 127.0.0.1 down", ifd, exec)) {
return(0);
}
return(1);
}
static int static_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]] [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up",
ifd, exec)) {
return(0);
}
if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) {
return(0);
}
return(1);
}
static int static_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) {
return(0);
}
if (!execute("ifconfig %iface% down", ifd, exec)) {
return(0);
}
return(1);
}
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(interface_defn_t *ifd, execfn *exec)
{
if (execable("/sbin/dhclient")) {
if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) {
return(0);
}
} else if (execable("/sbin/pump")) {
if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) {
return(0);
}
} else if (execable("/sbin/udhcpc")) {
if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) {
return 0;
}
} else if (execable("/sbin/dhcpcd")) {
if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) {
return(0);
}
}
return(1);
}
static int dhcp_down(interface_defn_t *ifd, execfn *exec)
{
if (execable("/sbin/dhclient")) {
if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
return(0);
}
} else if (execable("/sbin/pump")) {
if (!execute("pump -i %iface% -k", ifd, exec)) {
return(0);
}
} else if (execable("/sbin/udhcpc")) {
if (!execute("kill -9 `cat /var/run/udhcpc.%iface%.pid`", ifd, exec)) {
return(0);
}
} else if (execable("/sbin/dhcpcd")) {
if (!execute("dhcpcd -k %iface%", ifd, exec)) {
return(0);
}
}
if (!execute("ifconfig %iface% down", ifd, exec)) {
return(0);
}
return(1);
}
static int bootp_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]] [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) {
return 0;
}
return 1;
}
static int bootp_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute("ifconfig down %iface%", ifd, exec)) {
return 0;
}
return 1;
}
static int ppp_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("pon [[%provider%]]", ifd, exec)) {
return 0;
}
return 1;
}
static int ppp_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute("poff [[%provider%]]", ifd, exec)) {
return 0;
}
return 1;
}
static int wvdial_up(interface_defn_t *ifd, execfn *exec)
{
if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) {
return 0;
}
return 1;
}
static int wvdial_down(interface_defn_t *ifd, execfn *exec)
{
if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) {
return 0;
}
return 1;
}
static 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, },
};
address_family_t addr_inet = {
"inet",
sizeof(methods) / sizeof(method_t),
methods
};
#endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
static char *next_word(char *buf, char *word, int maxlen)
{
if (!buf)
return NULL;
if (!*buf)
return NULL;
while (!isspace(*buf) && *buf) {
if (maxlen-- > 1)
*word++ = *buf;
buf++;
}
if (maxlen > 0) {
*word = '\0';
}
while (isspace(*buf) && *buf) {
buf++;
}
return buf;
}
static address_family_t *get_address_family(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 method_t *get_method(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(interface_defn_t *ifa, 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 interfaces_file_t *read_interfaces(char *filename)
{
interface_defn_t *currif = NULL;
interfaces_file_t *defn;
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
mapping_defn_t *currmap = NULL;
#endif
FILE *f;
char firstword[80];
char *buf = NULL;
char *rest;
// int line;
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
defn = xmalloc(sizeof(interfaces_file_t));
// defn->max_autointerfaces = defn->n_autointerfaces = 0;
defn->autointerfaces = NULL;
defn->mappings = NULL;
defn->ifaces = NULL;
f = fopen(filename, "r");
if (f == NULL) {
return NULL;
}
while ((buf = get_line_from_file(f)) != NULL) {
char *end;
if (buf[0] == '#') {
continue;
}
end = last_char_is(buf, '\n');
if (end) {
*end = '\0';
}
while ((end = last_char_is(buf, ' ')) != NULL) {
*end = '\0';
}
rest = next_word(buf, firstword, 80);
if (rest == NULL) {
continue; /* blank line */
}
if (strcmp(firstword, "mapping") == 0) {
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
currmap = xmalloc(sizeof(mapping_defn_t));
currmap->max_matches = 0;
currmap->n_matches = 0;
currmap->match = NULL;
while ((rest = next_word(rest, firstword, 80))) {
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++] = xstrdup(firstword);
}
currmap->max_mappings = 0;
currmap->n_mappings = 0;
currmap->mapping = NULL;
currmap->script = NULL;
{
mapping_defn_t **where = &defn->mappings;
while (*where != NULL) {
where = &(*where)->next;
}
*where = currmap;
currmap->next = NULL;
}
#endif
currently_processing = MAPPING;
} else if (strcmp(firstword, "iface") == 0) {
{
char iface_name[80];
char address_family_name[80];
char method_name[80];
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(interface_defn_t));
rest = next_word(rest, iface_name, 80);
rest = next_word(rest, address_family_name, 80);
rest = next_word(rest, method_name, 80);
if (rest == NULL) {
error_msg("too few parameters for line \"%s\"", buf);
return NULL;
}
if (rest[0] != '\0') {
error_msg("too many parameters \"%s\"", buf);
return NULL;
}
currif->iface = xstrdup(iface_name);
currif->address_family = get_address_family(addr_fams, address_family_name);
if (!currif->address_family) {
error_msg("unknown address type \"%s\"", buf);
return NULL;
}
currif->method = get_method(currif->address_family, method_name);
if (!currif->method) {
error_msg("unknown method \"%s\"", buf);
return NULL;
}
currif->automatic = 1;
currif->max_options = 0;
currif->n_options = 0;
currif->option = NULL;
{
interface_defn_t **where = &defn->ifaces;
while (*where != NULL) {
if (duplicate_if(*where, currif)) {
error_msg("duplicate interface \"%s\"", buf);
return NULL;
}
where = &(*where)->next;
}
*where = currif;
currif->next = NULL;
}
}
currently_processing = IFACE;
} else if (strcmp(firstword, "auto") == 0) {
while ((rest = next_word(rest, firstword, 80))) {
/* Check the interface isnt already listed */
if (find_list_string(defn->autointerfaces, firstword)) {
perror_msg_and_die("interface declared auto twice \"%s\"", buf);
}
/* Add the interface to the list */
defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword));
}
currently_processing = NONE;
} else {
switch (currently_processing) {
case IFACE:
{
int i;
if (xstrlen(rest) == 0) {
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) {
error_msg("duplicate option \"%s\"", buf);
return NULL;
}
}
}
}
if (currif->n_options >= currif->max_options) {
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 = xstrdup(firstword);
currif->option[currif->n_options].value = xstrdup(rest);
if (!currif->option[currif->n_options].name) {
perror(filename);
return NULL;
}
if (!currif->option[currif->n_options].value) {
perror(filename);
return NULL;
}
currif->n_options++;
break;
case MAPPING:
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
if (strcmp(firstword, "script") == 0) {
if (currmap->script != NULL) {
error_msg("duplicate script in mapping \"%s\"", buf);
return NULL;
} else {
currmap->script = xstrdup(rest);
}
} 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] = xstrdup(rest);
currmap->n_mappings++;
} else {
error_msg("misplaced option \"%s\"", buf);
return NULL;
}
#endif
break;
case NONE:
default:
error_msg("misplaced option \"%s\"", buf);
return NULL;
}
}
}
if (ferror(f) != 0) {
perror_msg("%s", filename);
return NULL;
}
fclose(f);
return defn;
}
static int check(char *str)
{
return (str != NULL);
}
static char *setlocalenv(char *format, char *name, char *value)
{
char *result;
char *here;
char *there;
result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(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, xstrlen(there) + 1);
return result;
}
static void set_environ(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) {
error_msg("%s", 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);
default: /* parent */
}
waitpid(child, &status, 0);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
return 0;
}
}
return (1);
}
static int execute_all(interface_defn_t *ifd, execfn *exec, const char *opt)
{
int i;
char *buf;
for (i = 0; i < ifd->n_options; i++) {
if (strcmp(ifd->option[i].name, opt) == 0) {
if (!(*exec) (ifd->option[i].value)) {
return 0;
}
}
}
buf = xmalloc(xstrlen(opt) + 19);
sprintf(buf, "/etc/network/if-%s.d", opt);
run_parts(&buf, 0);
free(buf);
return (1);
}
static int iface_up(interface_defn_t *iface)
{
if (!iface->method->up(iface, check)) {
return (-1);
}
set_environ(iface, "start");
if (!execute_all(iface, doit, "pre-up")) {
return (0);
}
if (!iface->method->up(iface, doit)) {
return (0);
}
if (!execute_all(iface, doit, "up")) {
return (0);
}
return (1);
}
static int iface_down(interface_defn_t *iface)
{
if (!iface->method->down(iface, check)) {
return (-1);
}
set_environ(iface, "stop");
if (!execute_all(iface, doit, "down")) {
return (0);
}
if (!iface->method->down(iface, doit)) {
return (0);
}
if (!execute_all(iface, doit, "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 int run_mapping(char *physical, char *logical, int len, mapping_defn_t * map)
{
FILE *in, *out;
int i, status;
pid_t pid;
pid = popen2(&in, &out, map->script, physical, NULL);
if (pid == 0) {
return 0;
}
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 (fgets(logical, len, out)) {
char *pch = logical + xstrlen(logical) - 1;
while (pch >= logical && isspace(*pch))
*(pch--) = '\0';
}
}
fclose(out);
return 1;
}
#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
static llist_t *find_iface_state(llist_t *state_list, const char *iface)
{
unsigned short iface_len = xstrlen(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) (interface_defn_t *) = NULL;
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 (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 = 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:
show_usage();
break;
}
}
if (argc - optind > 0) {
if (do_all) {
show_usage();
}
} else {
if (!do_all) {
show_usage();
}
}
defn = read_interfaces(interfaces);
if (!defn) {
error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
}
if (no_act) {
state_fp = fopen(statefile, "r");
} else {
state_fp = xfopen(statefile, "a+");
}
/* Read the previous state from the state file */
if (state_fp != NULL) {
char *start;
while ((start = get_line_from_file(state_fp)) != NULL) {
char *end_ptr;
/* We should only need to check for a single character */
end_ptr = start + strcspn(start, " \t\n");
*end_ptr = '\0';
state_list = llist_add_to(state_list, start);
}
}
/* Create a list of interfaces to work on */
if (do_all) {
if (cmds == iface_up) {
target_list = defn->autointerfaces;
} else if (cmds == iface_down) {
const llist_t *list = state_list;
while (list) {
target_list = llist_add_to(target_list, strdup(list->data));
list = list->link;
}
}
} else {
target_list = llist_add_to(target_list, argv[optind]);
}
/* Update the interfaces */
while (target_list) {
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) {
error_msg("interface %s already configured", iface);
continue;
}
} else {
/* ifdown */
if (iface_state == NULL) {
error_msg("interface %s not configured", iface);
continue;
}
pch = strchr(iface_state->data, '=');
liface = strdup(pch + 1);
}
}
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
if ((cmds == iface_up) && run_mappings) {
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) {
error_msg("Running mapping script %s on %s", currmap->script, liface);
}
run_mapping(iface, liface, sizeof(liface), currmap);
break;
}
}
}
#endif
for (currif = defn->ifaces; currif; currif = currif->next) {
if (strcmp(liface, currif->iface) == 0) {
char *oldiface = currif->iface;
okay = 1;
currif->iface = iface;
if (verbose) {
error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
}
/* Call the cmds function pointer, does either iface_up() or iface_down() */
if (cmds(currif) == -1) {
printf
("Don't seem to be have all the variables for %s/%s.\n",
liface, currif->address_family->name);
}
currif->iface = oldiface;
}
}
if (!okay && !force) {
error_msg("Ignoring unknown interface %s=%s.", iface, liface);
} else {
llist_t *iface_state = find_iface_state(state_list, iface);
if (cmds == iface_up) {
char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
sprintf(newiface, "%s=%s", iface, liface);
if (iface_state == NULL) {
state_list = llist_add_to(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 (state_fp != NULL && !no_act) {
if (ftruncate(fileno(state_fp), 0) < 0) {
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;
}