/* vi: set sw=4 ts=4: */
/*
- * ifupdown for busybox
+ * ifup/ifdown for busybox
* Copyright (c) 2002 Glenn McGrath
* Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config IFUP
+//config: bool "ifup"
+//config: default y
+//config: help
+//config: Activate the specified interfaces. This applet makes use
+//config: of either "ifconfig" and "route" or the "ip" command to actually
+//config: configure network interfaces. Therefore, you will probably also want
+//config: to enable either IFCONFIG and ROUTE, or enable
+//config: FEATURE_IFUPDOWN_IP and the various IP options. Of
+//config: course you could use non-busybox versions of these programs, so
+//config: against my better judgement (since this will surely result in plenty
+//config: of support questions on the mailing list), I do not force you to
+//config: enable these additional options. It is up to you to supply either
+//config: "ifconfig", "route" and "run-parts" or the "ip" command, either
+//config: via busybox or via standalone utilities.
+//config:
+//config:config IFDOWN
+//config: bool "ifdown"
+//config: default y
+//config: help
+//config: Deactivate the specified interfaces.
+//config:
+//config:config IFUPDOWN_IFSTATE_PATH
+//config: string "Absolute path to ifstate file"
+//config: default "/var/run/ifstate"
+//config: depends on IFUP || IFDOWN
+//config: help
+//config: ifupdown keeps state information in a file called ifstate.
+//config: Typically it is located in /var/run/ifstate, however
+//config: some distributions tend to put it in other places
+//config: (debian, for example, uses /etc/network/run/ifstate).
+//config: This config option defines location of ifstate.
+//config:
+//config:config FEATURE_IFUPDOWN_IP
+//config: bool "Use ip tool (else ifconfig/route is used)"
+//config: default y
+//config: depends on IFUP || IFDOWN
+//config: help
+//config: Use the iproute "ip" command to implement "ifup" and "ifdown", rather
+//config: than the default of using the older "ifconfig" and "route" utilities.
+//config:
+//config: If Y: you must install either the full-blown iproute2 package
+//config: or enable "ip" applet in Busybox, or the "ifup" and "ifdown" applets
+//config: will not work.
+//config:
+//config: If N: you must install either the full-blown ifconfig and route
+//config: utilities, or enable these applets in Busybox.
+//config:
+//config:config FEATURE_IFUPDOWN_IPV4
+//config: bool "Support IPv4"
+//config: default y
+//config: depends on IFUP || IFDOWN
+//config: help
+//config: If you want ifup/ifdown to talk IPv4, leave this on.
+//config:
+//config:config FEATURE_IFUPDOWN_IPV6
+//config: bool "Support IPv6"
+//config: default y
+//config: depends on (IFUP || IFDOWN) && FEATURE_IPV6
+//config: help
+//config: If you need support for IPv6, turn this option on.
+//config:
+//UNUSED:
+////////:config FEATURE_IFUPDOWN_IPX
+////////: bool "Support IPX"
+////////: default y
+////////: depends on IFUP || IFDOWN
+////////: help
+////////: If this option is selected you can use busybox to work with IPX
+////////: networks.
+//config:
+//config:config FEATURE_IFUPDOWN_MAPPING
+//config: bool "Enable mapping support"
+//config: default y
+//config: depends on IFUP || IFDOWN
+//config: help
+//config: This enables support for the "mapping" stanza, unless you have
+//config: a weird network setup you don't need it.
+//config:
+//config:config FEATURE_IFUPDOWN_EXTERNAL_DHCP
+//config: bool "Support external DHCP clients"
+//config: default n
+//config: depends on IFUP || IFDOWN
+//config: help
+//config: This enables support for the external dhcp clients. Clients are
+//config: tried in the following order: dhcpcd, dhclient, pump and udhcpc.
+//config: Otherwise, if udhcpc applet is enabled, it is used.
+//config: Otherwise, ifup/ifdown will have no support for DHCP.
+
+// APPLET_ODDNAME:name main location suid_type help
+//applet:IF_IFUP( APPLET_ODDNAME(ifup, ifupdown, BB_DIR_SBIN, BB_SUID_DROP, ifup))
+//applet:IF_IFDOWN(APPLET_ODDNAME(ifdown, ifupdown, BB_DIR_SBIN, BB_SUID_DROP, ifdown))
+
+//kbuild:lib-$(CONFIG_IFUP) += ifupdown.o
+//kbuild:lib-$(CONFIG_IFDOWN) += ifupdown.o
+
//usage:#define ifup_trivial_usage
//usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
//usage:#define ifup_full_usage "\n\n"
-//usage: " -a De/configure all interfaces automatically"
+//usage: " -a Configure all interfaces"
//usage: "\n -i FILE Use FILE instead of /etc/network/interfaces"
//usage: "\n -n Print out what would happen, but don't do it"
//usage: IF_FEATURE_IFUPDOWN_MAPPING(
//usage: "\n -m Don't run any mappings"
//usage: )
//usage: "\n -v Print out what would happen before doing it"
-//usage: "\n -f Force de/configuration"
+//usage: "\n -f Force configuration"
//usage:
//usage:#define ifdown_trivial_usage
//usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
//usage:#define ifdown_full_usage "\n\n"
-//usage: " -a De/configure all interfaces automatically"
+//usage: " -a Deconfigure all interfaces"
//usage: "\n -i FILE Use FILE for interface definitions"
//usage: "\n -n Print out what would happen, but don't do it"
//usage: IF_FEATURE_IFUPDOWN_MAPPING(
//usage: "\n -m Don't run any mappings"
//usage: )
//usage: "\n -v Print out what would happen before doing it"
-//usage: "\n -f Force de/configuration"
+//usage: "\n -f Force deconfiguration"
#include "libbb.h"
#include "common_bufsiz.h"
#endif
#define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
+#define IFSTATE_FILE_PATH CONFIG_IFUPDOWN_IFSTATE_PATH
#define debug_noise(args...) /*fprintf(stderr, args)*/
static llist_t *read_iface_state(void)
{
llist_t *state_list = NULL;
- FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
+ FILE *state_fp = fopen_for_read(IFSTATE_FILE_PATH);
if (state_fp) {
char *start, *end_ptr;
return state_list;
}
+/* read the previous state from the state file */
+static FILE *open_new_state_file(void)
+{
+ int fd, flags, cnt;
+
+ cnt = 0;
+ flags = (O_WRONLY | O_CREAT | O_EXCL);
+ for (;;) {
+ fd = open(IFSTATE_FILE_PATH".new", flags, 0666);
+ if (fd >= 0)
+ break;
+ if (errno != EEXIST
+ || flags == (O_WRONLY | O_CREAT | O_TRUNC)
+ ) {
+ bb_perror_msg_and_die("can't open '%s'",
+ IFSTATE_FILE_PATH".new");
+ }
+ /* Someone else created the .new file */
+ if (cnt > 30 * 1000) {
+ /* Waited for 30*30/2 = 450 milliseconds, still EEXIST.
+ * Assuming a stale file, rewriting it.
+ */
+ flags = (O_WRONLY | O_CREAT | O_TRUNC);
+ continue;
+ }
+ usleep(cnt);
+ cnt += 1000;
+ }
+
+ return xfdopen_for_write(fd);
+}
int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ifupdown_main(int argc UNUSED_PARAM, char **argv)
G.startup_PATH = getenv("PATH");
G.shell = xstrdup(get_shell_name());
- cmds = iface_down;
- if (applet_name[2] == 'u') {
+ if (ENABLE_IFUP
+ && (!ENABLE_IFDOWN || applet_name[2] == 'u')
+ ) {
/* ifup command */
cmds = iface_up;
+ } else {
+ cmds = iface_down;
}
getopt32(argv, OPTION_STR, &interfaces);
any_failures = 1;
} else if (!NO_ACT) {
/* update the state file */
- FILE *state_fp;
+ FILE *new_state_fp = open_new_state_file();
llist_t *state;
llist_t *state_list = read_iface_state();
llist_t *iface_state = find_iface_state(state_list, iface);
}
/* Actually write the new state */
- state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
state = state_list;
while (state) {
if (state->data) {
- fprintf(state_fp, "%s\n", state->data);
+ fprintf(new_state_fp, "%s\n", state->data);
}
state = state->link;
}
- fclose(state_fp);
+ fclose(new_state_fp);
+ xrename(IFSTATE_FILE_PATH".new", IFSTATE_FILE_PATH);
llist_free(state_list, free);
}
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