--- /dev/null
+/*
+ * 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 "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 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 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 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("cat /var/run/dhclient.%iface%.pid | xargs -i kill -TERM {}", 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("cat /var/run/udhcpc.%iface%.pid | xargs -i kill -TERM {}", 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, char *opt)
+{
+ int i;
+ char buf[100];
+
+ for (i = 0; i < ifd->n_options; i++) {
+ if (strcmp(ifd->option[i].name, opt) == 0) {
+ if (!(*exec) (ifd->option[i].value)) {
+ return 0;
+ }
+ }
+ }
+
+ sprintf(buf, "run-parts /etc/network/if-%s.d", opt);
+ (*exec) (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;
+ struct option long_opts[] = {
+ {"help", no_argument, NULL, 'h'},
+ {"verbose", no_argument, NULL, 'v'},
+ {"all", no_argument, NULL, 'a'},
+ {"interfaces", required_argument, NULL, 'i'},
+ {"no-act", no_argument, NULL, 'n'},
+ {"no-mappings", no_argument, NULL, 1},
+ {"force", no_argument, NULL, 2},
+ {0, 0, 0, 0}
+ };
+ 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_long(argc, argv, "i:hvna", long_opts, NULL)) != EOF) {
+ switch (i) {
+ case 'i':
+ interfaces = xstrdup(optarg);
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ case 'a':
+ do_all = 1;
+ break;
+ case 'n':
+ no_act = 1;
+ break;
+ case 1:
+ run_mappings = 0;
+ break;
+ case 2:
+ 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;
+}
projects / oweals / busybox.git / commitdiff