busybox/networking/ifupdown.c
2002-11-19 09:58:56 +00:00

1428 lines
30 KiB
C

/*
* ifupdown for busybox
* Based on ifupdown by Anthony Towns
* Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
*
* Remove checks for kernel version, assume kernel version 2.2.0 or better
*
* 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"
//#include "busybox.h"
//#include "config.h"
#define IFUPDOWN_VERSION "0.6.4"
typedef struct interface_defn interface_defn;
typedef int (execfn)(char *command);
typedef int (command_set)(interface_defn *ifd, execfn *e);
typedef struct method {
char *name;
command_set *up;
command_set *down;
} method;
typedef struct address_family {
char *name;
int n_methods;
method *method;
} address_family;
typedef struct mapping_defn {
struct mapping_defn *next;
int max_matches;
int n_matches;
char **match;
char *script;
int max_mappings;
int n_mappings;
char **mapping;
} mapping_defn;
typedef struct variable {
char *name;
char *value;
} variable;
struct interface_defn {
struct interface_defn *next;
char *iface;
address_family *address_family;
method *method;
int automatic;
int max_options;
int n_options;
variable *option;
};
typedef struct interfaces_file {
int max_autointerfaces;
int n_autointerfaces;
char **autointerfaces;
interface_defn *ifaces;
mapping_defn *mappings;
} interfaces_file;
#define MAX_OPT_DEPTH 10
#define EUNBALBRACK 10001
#define EUNDEFVAR 10002
#define MAX_VARNAME 32
#define EUNBALPER 10000
static int no_act = 0;
static int 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 *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 *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 *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 *ifd, execfn *exec)
{
if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) {
return(0);
}
return(1);
}
static int static_down_ipx(interface_defn *ifd, execfn *exec)
{
if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static int dynamic_up(interface_defn *ifd, execfn *exec)
{
if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static int dynamic_down(interface_defn *ifd, execfn *exec)
{
if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) {
return(0);
}
return(1);
}
static method methods_ipx[] = {
{ "dynamic", dynamic_up, dynamic_down, },
{ "static", static_up_ipx, static_down_ipx, },
};
address_family addr_ipx = {
"ipx",
sizeof(methods_ipx) / sizeof(struct method),
methods_ipx
};
#endif /* IFUP_FEATURE_IPX */
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
static int loopback_up6(interface_defn *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% add ::1", ifd, exec)) {
return(0);
}
return(1);
}
static int loopback_down6(interface_defn *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% del ::1", ifd, exec))
return(0);
}
return(1);
}
static int static_up6(interface_defn *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 *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% down", ifd, exec)) {
return(0);
}
return(1);
}
static int v4tunnel_up(interface_defn *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 * ifd, execfn * exec)
{
if (!execute("ip tunnel del %iface%", ifd, exec)) {
return(0);
}
return(1);
}
static method methods6[] = {
{ "v4tunnel", v4tunnel_up, v4tunnel_down, },
{ "static", static_up6, static_down6, },
{ "loopback", loopback_up6, loopback_down6, },
};
address_family addr_inet6 = {
"inet6",
sizeof(methods6) / sizeof(struct method),
methods6
};
#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
static int loopback_up(interface_defn *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) {
return(0);
}
return(1);
}
static int loopback_down(interface_defn *ifd, execfn *exec)
{
if (!execute("ifconfig %iface% down", ifd, exec)) {
return(0);
}
return(1);
}
static int static_up(interface_defn *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 *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 *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 *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 *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 *ifd, execfn *exec)
{
if (!execute("ifconfig down %iface%", ifd, exec)) {
return 0;
}
return 1;
}
static int ppp_up(interface_defn *ifd, execfn *exec)
{
if (!execute("pon [[%provider%]]", ifd, exec)) {
return 0;
}
return 1;
}
static int ppp_down(interface_defn *ifd, execfn *exec)
{
if (!execute("poff [[%provider%]]", ifd, exec)) {
return 0;
}
return 1;
}
static int wvdial_up(interface_defn *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 *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 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 addr_inet = {
"inet",
sizeof(methods) / sizeof(struct method),
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 *get_address_family(address_family *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 *get_method(address_family *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 *ifa, interface_defn *ifb)
{
if (strcmp(ifa->iface, ifb->iface) != 0) {
return(0);
}
if (ifa->address_family != ifb->address_family) {
return(0);
}
return(1);
}
static int get_line(char **result, size_t * result_len, FILE * f, int *line)
{
size_t pos;
do {
pos = 0;
do {
if (*result_len - pos < 10) {
char *newstr = xrealloc(*result, *result_len * 2 + 80);
*result = newstr;
*result_len = *result_len * 2 + 80;
}
if (!fgets(*result + pos, *result_len - pos, f)) {
if (ferror(f) == 0 && pos == 0)
return 0;
if (ferror(f) != 0)
return 0;
}
pos += xstrlen(*result + pos);
} while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
if (pos != 0 && (*result)[pos - 1] == '\n') {
(*result)[--pos] = '\0';
}
(*line)++;
{
int first = 0;
while (isspace((*result)[first]) && (*result)[first]) {
first++;
}
memmove(*result, *result + first, pos - first + 1);
pos -= first;
}
} while ((*result)[0] == '#');
while ((*result)[pos - 1] == '\\') {
(*result)[--pos] = '\0';
do {
if (*result_len - pos < 10) {
char *newstr = xrealloc(*result, *result_len * 2 + 80);
*result = newstr;
*result_len = *result_len * 2 + 80;
}
if (!fgets(*result + pos, *result_len - pos, f)) {
if (ferror(f) == 0 && pos == 0)
return 0;
if (ferror(f) != 0)
return 0;
}
pos += xstrlen(*result + pos);
} while (pos == *result_len - 1 && (*result)[pos - 1] != '\n');
if (pos != 0 && (*result)[pos - 1] == '\n') {
(*result)[--pos] = '\0';
}
(*line)++;
}
while (isspace((*result)[pos - 1])) { /* remove trailing whitespace */
pos--;
}
(*result)[pos] = '\0';
return 1;
}
static interfaces_file *read_interfaces(char *filename)
{
interface_defn *currif = NULL;
interfaces_file *defn;
mapping_defn *currmap = NULL;
FILE *f;
char firstword[80];
char *buf = NULL;
char *rest;
int line;
size_t buf_len = 0;
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
defn = xmalloc(sizeof(interfaces_file));
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;
}
line = 0;
while (get_line(&buf, &buf_len, f, &line)) {
rest = next_word(buf, firstword, 80);
if (rest == NULL) {
continue; /* blank line */
}
if (strcmp(firstword, "mapping") == 0) {
currmap = xmalloc(sizeof(mapping_defn));
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 **where = &defn->mappings;
while (*where != NULL) {
where = &(*where)->next;
}
*where = currmap;
currmap->next = NULL;
}
currently_processing = MAPPING;
} else if (strcmp(firstword, "iface") == 0) {
{
char iface_name[80];
char address_family_name[80];
char method_name[80];
address_family *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));
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("%s:%d: too few parameters for iface line", filename, line);
return NULL;
}
if (rest[0] != '\0') {
error_msg("%s:%d: too many parameters for iface line", filename, line);
return NULL;
}
currif->iface = xstrdup(iface_name);
currif->address_family = get_address_family(addr_fams, address_family_name);
if (!currif->address_family) {
error_msg("%s:%d: unknown address type", filename, line);
return NULL;
}
currif->method = get_method(currif->address_family, method_name);
if (!currif->method) {
error_msg("%s:%d: unknown method", filename, line);
return NULL;
}
currif->automatic = 1;
currif->max_options = 0;
currif->n_options = 0;
currif->option = NULL;
{
interface_defn **where = &defn->ifaces;
while (*where != NULL) {
if (duplicate_if(*where, currif)) {
error_msg("%s:%d: duplicate interface", filename, line);
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))) {
int i;
for (i = 0; i < defn->n_autointerfaces; i++) {
if (strcmp(firstword, defn->autointerfaces[i]) == 0) {
perror_msg("%s:%d: interface declared auto twice", filename, line);
return NULL;
}
}
if (defn->n_autointerfaces == defn->max_autointerfaces) {
char **tmp;
defn->max_autointerfaces *= 2;
defn->max_autointerfaces++;
tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces);
defn->autointerfaces = tmp;
}
defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword);
defn->n_autointerfaces++;
}
currently_processing = NONE;
} else {
switch (currently_processing) {
case IFACE:
{
int i;
if (xstrlen(rest) == 0) {
error_msg("%s:%d: option with empty value", filename, line);
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("%s:%d: duplicate option", filename, line);
return NULL;
}
}
}
}
if (currif->n_options >= currif->max_options) {
variable *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:
if (strcmp(firstword, "script") == 0) {
if (currmap->script != NULL) {
error_msg("%s:%d: duplicate script in mapping", filename, line);
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("%s:%d: misplaced option", filename, line);
return NULL;
}
break;
case NONE:
default:
error_msg("%s:%d: misplaced option", filename, line);
return NULL;
}
}
}
if (ferror(f) != 0) {
perror_msg("%s", filename);
return NULL;
}
fclose(f);
line = -1;
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 *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 *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 *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 *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);
}
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 * 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;
}
static int lookfor_iface(char **ifaces, int n_ifaces, char *iface)
{
int i;
for (i = 0; i < n_ifaces; i++) {
if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) {
if (ifaces[i][xstrlen(iface)] == '=') {
return i;
}
}
}
return(-1);
}
static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface)
{
if (*max_ifaces == *n_ifaces) {
*max_ifaces = (*max_ifaces * 2) + 1;
*ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces);
}
(*ifaces)[(*n_ifaces)++] = new_iface;
}
extern int ifupdown_main(int argc, char **argv)
{
int (*cmds) (interface_defn *) = NULL;
interfaces_file *defn;
FILE *state_fp = NULL;
char **target_iface = NULL;
char **state = NULL; /* list of iface=liface */
char *interfaces = "/etc/network/interfaces";
char *statefile = "/etc/network/ifstate";
int do_all = 0;
int run_mappings = 1;
int force = 0;
int n_target_ifaces = 0;
int n_state = 0;
int max_state = 0;
int i;
if (applet_name[2] == 'u') {
/* ifup command */
cmds = iface_up;
} else {
/* ifdown command */
cmds = iface_down;
}
while ((i = getopt(argc, argv, "i:hvnamf")) != -1) {
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;
case 'm': /* no-mappings */
run_mappings = 0;
break;
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);
}
state_fp = fopen(statefile, no_act ? "r" : "a+");
if (state_fp == NULL && !no_act) {
perror_msg_and_die("failed to open statefile %s", statefile);
}
if (state_fp != NULL) {
char buf[80];
char *p;
if (!no_act) {
int flags;
struct flock lock;
const int state_fd = fileno(state_fp);
flags = fcntl(state_fd, F_GETFD);
if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) {
perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile);
}
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 0;
if (fcntl(state_fd, F_SETLKW, &lock) < 0) {
perror_msg_and_die("failed to lock statefile %s", statefile);
}
}
rewind(state_fp);
while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) {
char *pch;
pch = buf + xstrlen(buf) - 1;
while (pch > buf && isspace(*pch)) {
pch--;
}
*(pch + 1) = '\0';
pch = buf;
while (isspace(*pch)) {
pch++;
}
add_to_state(&state, &n_state, &max_state, xstrdup(pch));
}
}
if (do_all) {
if (cmds == iface_up) {
target_iface = defn->autointerfaces;
n_target_ifaces = defn->n_autointerfaces;
} else if (cmds == iface_down) {
target_iface = state;
n_target_ifaces = n_state;
}
} else {
target_iface = argv + optind;
n_target_ifaces = argc - optind;
}
for (i = 0; i < n_target_ifaces; i++) {
interface_defn *currif;
char iface[80];
char liface[80];
char *pch;
int okay = 0;
strncpy(iface, target_iface[i], sizeof(iface));
iface[sizeof(iface) - 1] = '\0';
if ((pch = strchr(iface, '='))) {
*pch = '\0';
strncpy(liface, pch + 1, sizeof(liface));
liface[sizeof(liface) - 1] = '\0';
} else {
strncpy(liface, iface, sizeof(liface));
liface[sizeof(liface) - 1] = '\0';
}
if (!force) {
int already_up = lookfor_iface(state, n_state, iface);;
if (cmds == iface_up) {
/* ifup */
if (already_up != -1) {
error_msg("interface %s already configured", iface);
continue;
}
} else {
/* ifdown */
if (already_up == -1) {
error_msg("interface %s not configured", iface);
continue;
}
strncpy(liface, strchr(state[already_up], '=') + 1, 80);
liface[79] = 0;
}
}
if ((cmds == iface_up) && run_mappings) {
mapping_defn *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;
}
}
}
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);
}
switch (cmds(currif)) {
case -1:
printf
("Don't seem to be have all the variables for %s/%s.\n",
liface, currif->address_family->name);
break;
case 0:
/* this wasn't entirely successful, should it be added to
* the state file?
*/
case 1:
/* successful */
}
currif->iface = oldiface;
}
}
if (!okay && !force) {
error_msg("Ignoring unknown interface %s=%s.", iface, liface);
} else {
int already_up = lookfor_iface(state, n_state, iface);
if (cmds == iface_up) {
char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
sprintf(newiface, "%s=%s", iface, liface);
if (already_up == -1) {
add_to_state(&state, &n_state, &max_state, newiface);
} else {
free(state[already_up]);
state[already_up] = newiface;
}
} else if (cmds == iface_down) {
if (already_up != -1) {
state[already_up] = state[--n_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);
for (i = 0; i < n_state; i++) {
fputs(state[i], state_fp);
fputc('\n', state_fp);
}
fflush(state_fp);
}
}
if (state_fp != NULL) {
fclose(state_fp);
state_fp = NULL;
}
return 0;
}