busybox/networking/ifupdown.c

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/* vi: set sw=4 ts=4: */
/*
* ifup/ifdown for busybox
* Copyright (c) 2002 Glenn McGrath
* Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
*
* Based on ifupdown v 0.6.4 by Anthony Towns
* Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
*
* Changes to upstream version
* Remove checks for kernel version, assume kernel version 2.2.0 or better.
* Lines in the interfaces file cannot wrap.
* To adhere to the FHS, the default state file is /var/run/ifstate
* (defined via CONFIG_IFUPDOWN_IFSTATE_PATH) and can be overridden by build
* configuration.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config IFUP
//config: bool "ifup (14 kb)"
//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 (13 kb)"
//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 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 (note: doesn't disable mappings)"
//usage: "\n -m Don't run any mappings"
//usage: )
//usage: "\n -v Print out what would happen before doing it"
//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 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 (note: doesn't disable mappings)"
//usage: "\n -m Don't run any mappings"
//usage: )
//usage: "\n -v Print out what would happen before doing it"
//usage: "\n -f Force deconfiguration"
#include <net/if.h>
#include "libbb.h"
#include "common_bufsiz.h"
/* After libbb.h, since it needs sys/types.h on some systems */
#include <sys/utsname.h>
#include <fnmatch.h>
#define MAX_OPT_DEPTH 10
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
#define MAX_INTERFACE_LENGTH 10
#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)*/
/* Forward declaration */
struct interface_defn_t;
typedef int execfn(char *command);
struct method_t {
const char *name;
int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
};
struct address_family_t {
const char *name;
int n_methods;
const struct method_t *method;
};
struct mapping_defn_t {
struct mapping_defn_t *next;
int max_matches;
int n_matches;
char **match;
char *script;
int n_mappings;
char **mapping;
};
struct variable_t {
char *name;
char *value;
};
struct interface_defn_t {
const struct address_family_t *address_family;
const struct method_t *method;
2006-02-28 09:23:14 +05:30
char *iface;
int n_options;
struct variable_t *option;
};
struct interfaces_file_t {
llist_t *autointerfaces;
llist_t *ifaces;
struct mapping_defn_t *mappings;
};
#define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
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enum {
OPT_do_all = 0x1,
OPT_no_act = 0x2,
OPT_verbose = 0x4,
OPT_force = 0x8,
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OPT_no_mappings = 0x10,
};
#define DO_ALL (option_mask32 & OPT_do_all)
#define NO_ACT (option_mask32 & OPT_no_act)
#define VERBOSE (option_mask32 & OPT_verbose)
#define FORCE (option_mask32 & OPT_force)
#define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
2006-09-23 18:19:01 +05:30
struct globals {
char **my_environ;
const char *startup_PATH;
char *shell;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
static const char keywords_up_down[] ALIGN1 =
"up\0"
"down\0"
"pre-up\0"
"post-down\0"
;
#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
static void addstr(char **bufp, const char *str, size_t str_length)
{
/* xasprintf trick will be smaller, but we are often
* called with str_length == 1 - don't want to have
* THAT much of malloc/freeing! */
char *buf = *bufp;
int len = (buf ? strlen(buf) : 0);
str_length++;
buf = xrealloc(buf, len + str_length);
/* copies at most str_length-1 chars! */
safe_strncpy(buf + len, str, str_length);
*bufp = buf;
}
static int strncmpz(const char *l, const char *r, size_t llen)
{
int i = strncmp(l, r, llen);
if (i == 0)
return - (unsigned char)r[llen];
return i;
}
static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
{
int i;
if (strncmpz(id, "iface", idlen) == 0) {
// ubuntu's ifup doesn't do this:
//static char *label_buf;
//char *result;
//free(label_buf);
//label_buf = xstrdup(ifd->iface);
// Remove virtual iface suffix
//result = strchrnul(label_buf, ':');
//*result = '\0';
//return label_buf;
return ifd->iface;
}
if (strncmpz(id, "label", idlen) == 0) {
return ifd->iface;
}
for (i = 0; i < ifd->n_options; i++) {
if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
return ifd->option[i].value;
}
}
return NULL;
}
# if ENABLE_FEATURE_IFUPDOWN_IP
static int count_netmask_bits(const char *dotted_quad)
{
// int result;
// unsigned a, b, c, d;
// /* Found a netmask... Check if it is dotted quad */
// if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
// return -1;
// if ((a|b|c|d) >> 8)
// return -1; /* one of numbers is >= 256 */
// d |= (a << 24) | (b << 16) | (c << 8); /* IP */
// d = ~d; /* 11110000 -> 00001111 */
/* Shorter version */
int result;
struct in_addr ip;
unsigned d;
if (inet_aton(dotted_quad, &ip) == 0)
return -1; /* malformed dotted IP */
d = ntohl(ip.s_addr); /* IP in host order */
d = ~d; /* 11110000 -> 00001111 */
if (d & (d+1)) /* check that it is in 00001111 form */
return -1; /* no it is not */
result = 32;
while (d) {
d >>= 1;
result--;
}
return result;
}
# endif
static char *parse(const char *command, struct interface_defn_t *ifd)
{
size_t old_pos[MAX_OPT_DEPTH] = { 0 };
smallint okay[MAX_OPT_DEPTH] = { 1 };
int opt_depth = 1;
char *result = NULL;
while (*command) {
switch (*command) {
default:
addstr(&result, command, 1);
command++;
break;
case '\\':
if (command[1])
command++;
addstr(&result, command, 1);
command++;
break;
case '[':
if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
old_pos[opt_depth] = result ? strlen(result) : 0;
okay[opt_depth] = 1;
opt_depth++;
command += 2;
} else {
addstr(&result, command, 1);
command++;
}
break;
case ']':
if (command[1] == ']' && opt_depth > 1) {
opt_depth--;
if (!okay[opt_depth]) {
result[old_pos[opt_depth]] = '\0';
}
command += 2;
} else {
addstr(&result, command, 1);
command++;
}
break;
case '%':
{
char *nextpercent;
char *varvalue;
command++;
nextpercent = strchr(command, '%');
if (!nextpercent) {
/* Unterminated %var% */
free(result);
return NULL;
}
varvalue = get_var(command, nextpercent - command, ifd);
if (varvalue) {
# if ENABLE_FEATURE_IFUPDOWN_IP
/* "hwaddress <class> <address>":
* unlike ifconfig, ip doesnt want <class>
* (usually "ether" keyword). Skip it. */
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(command, "hwaddress")) {
varvalue = skip_whitespace(skip_non_whitespace(varvalue));
}
# endif
addstr(&result, varvalue, strlen(varvalue));
} else {
# if ENABLE_FEATURE_IFUPDOWN_IP
/* Sigh... Add a special case for 'ip' to convert from
* dotted quad to bit count style netmasks. */
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(command, "bnmask")) {
unsigned res;
varvalue = get_var("netmask", 7, ifd);
if (varvalue) {
res = count_netmask_bits(varvalue);
if (res > 0) {
const char *argument = utoa(res);
addstr(&result, argument, strlen(argument));
command = nextpercent + 1;
break;
}
}
}
# endif
okay[opt_depth - 1] = 0;
}
command = nextpercent + 1;
}
break;
}
}
if (opt_depth > 1) {
/* Unbalanced bracket */
free(result);
return NULL;
}
if (!okay[0]) {
/* Undefined variable and we aren't in a bracket */
free(result);
return NULL;
}
return result;
}
/* execute() returns 1 for success and 0 for failure */
static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
{
char *out;
int ret;
out = parse(command, ifd);
if (!out) {
/* parse error? */
return 0;
}
/* out == "": parsed ok but not all needed variables known, skip */
ret = out[0] ? (*exec)(out) : 1;
free(out);
if (ret != 1) {
return 0;
}
return 1;
}
#endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
#if ENABLE_FEATURE_IFUPDOWN_IPV6
static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
{
# if ENABLE_FEATURE_IFUPDOWN_IP
int result;
result = execute("ip addr add ::1 dev %iface%", ifd, exec);
result += execute("ip link set %iface% up", ifd, exec);
return ((result == 2) ? 2 : 0);
# else
return execute("ifconfig %iface% add ::1", ifd, exec);
# endif
}
static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
{
# if ENABLE_FEATURE_IFUPDOWN_IP
return execute("ip link set %iface% down", ifd, exec);
# else
return execute("ifconfig %iface% del ::1", ifd, exec);
# endif
}
static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
{
return 1;
}
static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
{
int result;
# if ENABLE_FEATURE_IFUPDOWN_IP
result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
/* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
result += execute("[[ip route add ::/0 via %gateway% dev %iface%]][[ metric %metric%]]", ifd, exec);
# else
result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
# endif
return ((result == 3) ? 3 : 0);
}
static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
{
if (!if_nametoindex(ifd->iface))
return 1; /* already gone */
# if ENABLE_FEATURE_IFUPDOWN_IP
return execute("ip link set %iface% down", ifd, exec);
# else
return execute("ifconfig %iface% down", ifd, exec);
# endif
}
# if ENABLE_FEATURE_IFUPDOWN_IP
static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
{
int result;
result = execute("ip tunnel add %iface% mode sit remote "
"%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
result += execute("ip link set %iface% up", ifd, exec);
result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
/* Reportedly, IPv6 needs "dev %iface%", but IPv4 does not: */
result += execute("[[ip route add ::/0 via %gateway% dev %iface%]]", ifd, exec);
return ((result == 4) ? 4 : 0);
}
static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
{
return execute("ip tunnel del %iface%", ifd, exec);
}
# endif
static const struct method_t methods6[] = {
# if ENABLE_FEATURE_IFUPDOWN_IP
{ "v4tunnel" , v4tunnel_up , v4tunnel_down , },
# endif
{ "static" , static_up6 , static_down6 , },
{ "manual" , manual_up_down6 , manual_up_down6 , },
{ "loopback" , loopback_up6 , loopback_down6 , },
};
static const struct address_family_t addr_inet6 = {
"inet6",
ARRAY_SIZE(methods6),
methods6
};
#endif /* FEATURE_IFUPDOWN_IPV6 */
#if ENABLE_FEATURE_IFUPDOWN_IPV4
static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
{
# if ENABLE_FEATURE_IFUPDOWN_IP
int result;
result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
result += execute("ip link set %iface% up", ifd, exec);
return ((result == 2) ? 2 : 0);
# else
return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
# endif
}
static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
{
# if ENABLE_FEATURE_IFUPDOWN_IP
int result;
result = execute("ip addr flush dev %iface%", ifd, exec);
result += execute("ip link set %iface% down", ifd, exec);
return ((result == 2) ? 2 : 0);
# else
return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
# endif
}
static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
{
int result;
# if ENABLE_FEATURE_IFUPDOWN_IP
result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
"dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
result += execute("[[ip route add default via %gateway% dev %iface%[[ metric %metric%]]]]", ifd, exec);
return ((result == 3) ? 3 : 0);
# else
/* ifconfig said to set iface up before it processes hw %hwaddress%,
* which then of course fails. Thus we run two separate ifconfig */
result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
ifd, exec);
result += execute("ifconfig %iface% %address% netmask %netmask%"
"[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]]",
ifd, exec);
result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
return ((result == 3) ? 3 : 0);
# endif
}
static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
{
int result;
if (!if_nametoindex(ifd->iface))
return 2; /* already gone */
# if ENABLE_FEATURE_IFUPDOWN_IP
/* Optional "label LBL" is necessary if interface is an alias (eth0:0),
* otherwise "ip addr flush dev eth0:0" flushes all addresses on eth0.
*/
result = execute("ip addr flush dev %iface%[[ label %label%]]", ifd, exec);
result += execute("ip link set %iface% down", ifd, exec);
# else
/* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
/* Bringing the interface down deletes the routes in itself.
Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
result = 1;
result += execute("ifconfig %iface% down", ifd, exec);
# endif
return ((result == 2) ? 2 : 0);
}
# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
struct dhcp_client_t {
const char *name;
const char *startcmd;
const char *stopcmd;
};
static const struct dhcp_client_t ext_dhcp_clients[] = {
{ "dhcpcd",
"dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
"dhcpcd -k %iface%",
},
{ "dhclient",
"dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
"kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
},
{ "pump",
"pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
"pump -i %iface% -k",
},
{ "udhcpc",
"udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -x hostname:%hostname%]][[ -c %client%]]"
"[[ -s %script%]][[ %udhcpc_opts%]]",
"kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
},
};
# endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
{
unsigned i;
# if ENABLE_FEATURE_IFUPDOWN_IP
2007-07-21 20:27:54 +05:30
/* ip doesn't up iface when it configures it (unlike ifconfig) */
if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
return 0;
# else
/* needed if we have hwaddress on dhcp iface */
if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
2007-07-21 20:27:54 +05:30
return 0;
# endif
for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
if (executable_exists(ext_dhcp_clients[i].name))
return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
}
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_error_msg("no dhcp clients found");
return 0;
}
# elif ENABLE_UDHCPC
static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
{
# if ENABLE_FEATURE_IFUPDOWN_IP
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/* ip doesn't up iface when it configures it (unlike ifconfig) */
if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
return 0;
# else
/* needed if we have hwaddress on dhcp iface */
if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
2007-07-21 20:27:54 +05:30
return 0;
# endif
return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
"-i %iface%[[ -x hostname:%hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
ifd, exec);
}
# else
static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
2008-07-05 14:48:54 +05:30
execfn *exec UNUSED_PARAM)
{
return 0; /* no dhcp support */
}
# endif
# if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
{
int result = 0;
unsigned i;
for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
if (executable_exists(ext_dhcp_clients[i].name)) {
result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
if (result)
break;
}
}
if (!result)
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_error_msg("warning: no dhcp clients found and stopped");
/* Sleep a bit, otherwise static_down tries to bring down interface too soon,
and it may come back up because udhcpc is still shutting down */
usleep(100000);
result += static_down(ifd, exec);
return ((result == 3) ? 3 : 0);
}
# elif ENABLE_UDHCPC
static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
{
int result;
result = execute(
"test -f /var/run/udhcpc.%iface%.pid && "
"kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
ifd, exec);
/* Also bring the hardware interface down since
killing the dhcp client alone doesn't do it.
This enables consecutive ifup->ifdown->ifup */
/* Sleep a bit, otherwise static_down tries to bring down interface too soon,
and it may come back up because udhcpc is still shutting down */
usleep(100000);
result += static_down(ifd, exec);
return ((result == 3) ? 3 : 0);
}
# else
static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
2008-07-05 14:48:54 +05:30
execfn *exec UNUSED_PARAM)
{
return 0; /* no dhcp support */
}
# endif
static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
{
return 1;
}
static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
{
return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
"[[ --server %server%]][[ --hwaddr %hwaddr%]]"
" --returniffail --serverbcast", ifd, exec);
}
static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
{
return execute("pon[[ %provider%]]", ifd, exec);
}
static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
{
return execute("poff[[ %provider%]]", ifd, exec);
}
static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
{
return execute("start-stop-daemon --start -x wvdial "
"-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
}
static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
{
return execute("start-stop-daemon --stop -x wvdial "
"-p /var/run/wvdial.%iface% -s 2", ifd, exec);
}
static const struct method_t methods[] = {
{ "manual" , manual_up_down, manual_up_down, },
{ "wvdial" , wvdial_up , wvdial_down , },
{ "ppp" , ppp_up , ppp_down , },
{ "static" , static_up , static_down , },
{ "bootp" , bootp_up , static_down , },
{ "dhcp" , dhcp_up , dhcp_down , },
{ "loopback", loopback_up , loopback_down , },
};
static const struct address_family_t addr_inet = {
"inet",
ARRAY_SIZE(methods),
methods
};
#endif /* FEATURE_IFUPDOWN_IPV4 */
static int FAST_FUNC link_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
{
return 1;
}
static const struct method_t link_methods[] = {
{ "none", link_up_down, link_up_down }
};
static const struct address_family_t addr_link = {
"link", ARRAY_SIZE(link_methods), link_methods
};
/* Returns pointer to the next word, or NULL.
* In 1st case, advances *buf to the word after this one.
*/
static char *next_word(char **buf)
{
unsigned length;
char *word;
/* Skip over leading whitespace */
2006-10-25 18:16:03 +05:30
word = skip_whitespace(*buf);
/* Stop on EOL */
if (*word == '\0')
return NULL;
/* Find the length of this word (can't be 0) */
length = strcspn(word, " \t\n");
/* Unless we are already at NUL, store NUL and advance */
if (word[length] != '\0')
word[length++] = '\0';
*buf = skip_whitespace(word + length);
return word;
}
static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
{
int i;
2006-11-21 01:10:36 +05:30
if (!name)
return NULL;
for (i = 0; af[i]; i++) {
if (strcmp(af[i]->name, name) == 0) {
return af[i];
}
}
return NULL;
}
static const struct method_t *get_method(const struct address_family_t *af, char *name)
{
int i;
2006-11-21 01:10:36 +05:30
if (!name)
return NULL;
2007-10-07 02:17:53 +05:30
/* TODO: use index_in_str_array() */
for (i = 0; i < af->n_methods; i++) {
if (strcmp(af->method[i].name, name) == 0) {
return &af->method[i];
}
}
return NULL;
}
static struct interfaces_file_t *read_interfaces(const char *filename, struct interfaces_file_t *defn)
{
/* Let's try to be compatible.
*
* "man 5 interfaces" says:
* Lines starting with "#" are ignored. Note that end-of-line
* comments are NOT supported, comments must be on a line of their own.
* A line may be extended across multiple lines by making
* the last character a backslash.
*
* Seen elsewhere in example config file:
* A first non-blank "#" character makes the rest of the line
* be ignored. Blank lines are ignored. Lines may be indented freely.
* A "\" character at the very end of the line indicates the next line
* should be treated as a continuation of the current one.
*
* Lines beginning with "source" are used to include stanzas from
* other files, so configuration can be split into many files.
* The word "source" is followed by the path of file to be sourced.
*/
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
struct mapping_defn_t *currmap = NULL;
#endif
struct interface_defn_t *currif = NULL;
FILE *f;
char *buf;
char *first_word;
char *rest_of_line;
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
if (!defn)
defn = xzalloc(sizeof(*defn));
debug_noise("reading %s file:\n", filename);
f = xfopen_for_read(filename);
while ((buf = xmalloc_fgetline(f)) != NULL) {
#if ENABLE_DESKTOP
/* Trailing "\" concatenates lines */
char *p;
while ((p = last_char_is(buf, '\\')) != NULL) {
*p = '\0';
rest_of_line = xmalloc_fgetline(f);
if (!rest_of_line)
break;
p = xasprintf("%s%s", buf, rest_of_line);
free(buf);
free(rest_of_line);
buf = p;
}
#endif
rest_of_line = buf;
first_word = next_word(&rest_of_line);
if (!first_word || *first_word == '#') {
free(buf);
continue; /* blank/comment line */
}
if (strcmp(first_word, "mapping") == 0) {
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
currmap = xzalloc(sizeof(*currmap));
while ((first_word = next_word(&rest_of_line)) != NULL) {
currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
currmap->match[currmap->n_matches++] = xstrdup(first_word);
}
/*currmap->n_mappings = 0;*/
/*currmap->mapping = NULL;*/
/*currmap->script = NULL;*/
{
struct mapping_defn_t **where = &defn->mappings;
while (*where != NULL) {
where = &(*where)->next;
}
*where = currmap;
/*currmap->next = NULL;*/
}
debug_noise("Added mapping\n");
#endif
currently_processing = MAPPING;
} else if (strcmp(first_word, "iface") == 0) {
static const struct address_family_t *const addr_fams[] = {
#if ENABLE_FEATURE_IFUPDOWN_IPV4
&addr_inet,
#endif
#if ENABLE_FEATURE_IFUPDOWN_IPV6
&addr_inet6,
#endif
&addr_link,
NULL
};
char *iface_name;
char *address_family_name;
char *method_name;
currif = xzalloc(sizeof(*currif));
iface_name = next_word(&rest_of_line);
address_family_name = next_word(&rest_of_line);
method_name = next_word(&rest_of_line);
if (method_name == NULL)
bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
/* ship any trailing whitespace */
rest_of_line = skip_whitespace(rest_of_line);
if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
bb_error_msg_and_die("too many parameters \"%s\"", buf);
currif->iface = xstrdup(iface_name);
currif->address_family = get_address_family(addr_fams, address_family_name);
if (!currif->address_family)
bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
currif->method = get_method(currif->address_family, method_name);
if (!currif->method)
bb_error_msg_and_die("unknown method \"%s\"", method_name);
#if 0
// Allegedly, Debian allows a duplicate definition:
// iface eth0 inet static
// address 192.168.0.15
// netmask 255.255.0.0
// gateway 192.168.0.1
//
// iface eth0 inet static
// address 10.0.0.1
// netmask 255.255.255.0
//
// This adds *two* addresses to eth0 (probably requires use of "ip", not "ifconfig"
//
llist_t *iface_list;
for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
if ((strcmp(tmp->iface, currif->iface) == 0)
&& (tmp->address_family == currif->address_family)
) {
bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
}
}
#endif
llist_add_to_end(&(defn->ifaces), (char*)currif);
debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
currently_processing = IFACE;
} else if (strcmp(first_word, "auto") == 0) {
while ((first_word = next_word(&rest_of_line)) != NULL) {
/* Check the interface isnt already listed */
if (llist_find_str(defn->autointerfaces, first_word)) {
2003-03-19 14:43:01 +05:30
bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
}
/* Add the interface to the list */
llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
debug_noise("\nauto %s\n", first_word);
}
currently_processing = NONE;
} else if (strcmp(first_word, "source") == 0) {
read_interfaces(next_word(&rest_of_line), defn);
} else if (is_prefixed_with(first_word, "source-dir")) {
const char *dirpath;
DIR *dir;
struct dirent *entry;
dirpath = next_word(&rest_of_line);
dir = xopendir(dirpath);
while ((entry = readdir(dir)) != NULL) {
char *path;
if (entry->d_name[0] == '.')
continue;
path = concat_path_file(dirpath, entry->d_name);
read_interfaces(path, defn);
free(path);
}
closedir(dir);
} else {
switch (currently_processing) {
case IFACE:
if (rest_of_line[0] == '\0')
bb_error_msg_and_die("option with empty value \"%s\"", buf);
if (strcmp(first_word, "post-up") == 0)
first_word += 5; /* "up" */
else if (strcmp(first_word, "pre-down") == 0)
first_word += 4; /* "down" */
/* If not one of "up", "down",... words... */
if (index_in_strings(keywords_up_down, first_word) < 0) {
int i;
for (i = 0; i < currif->n_options; i++) {
if (strcmp(currif->option[i].name, first_word) == 0)
bb_error_msg_and_die("duplicate option \"%s\"", buf);
}
}
debug_noise("\t%s=%s\n", first_word, rest_of_line);
currif->option = xrealloc_vector(currif->option, 4, currif->n_options);
currif->option[currif->n_options].name = xstrdup(first_word);
currif->option[currif->n_options].value = xstrdup(rest_of_line);
currif->n_options++;
break;
case MAPPING:
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
if (strcmp(first_word, "script") == 0) {
if (currmap->script != NULL)
bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
currmap->script = xstrdup(next_word(&rest_of_line));
} else if (strcmp(first_word, "map") == 0) {
currmap->mapping = xrealloc_vector(currmap->mapping, 2, currmap->n_mappings);
currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
currmap->n_mappings++;
} else {
bb_error_msg_and_die("misplaced option \"%s\"", buf);
}
#endif
break;
case NONE:
default:
bb_error_msg_and_die("misplaced option \"%s\"", buf);
}
}
free(buf);
} /* while (fgets) */
if (ferror(f) != 0) {
/* ferror does NOT set errno! */
bb_error_msg_and_die("%s: I/O error", filename);
}
fclose(f);
debug_noise("\ndone reading %s\n\n", filename);
return defn;
}
static char *setlocalenv(const char *format, const char *name, const char *value)
{
char *result;
char *dst;
char *src;
char c;
result = xasprintf(format, name, value);
for (dst = src = result; (c = *src) != '=' && c; src++) {
if (c == '-')
c = '_';
if (c >= 'a' && c <= 'z')
c -= ('a' - 'A');
if (isalnum(c) || c == '_')
*dst++ = c;
}
overlapping_strcpy(dst, src);
return result;
}
static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
{
int i;
char **pp;
if (G.my_environ != NULL) {
for (pp = G.my_environ; *pp; pp++) {
free(*pp);
}
free(G.my_environ);
}
/* note: last element will stay NULL: */
G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
pp = G.my_environ;
for (i = 0; i < iface->n_options; i++) {
if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
continue;
}
*pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
}
*pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
*pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
*pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
*pp++ = setlocalenv("%s=%s", "MODE", mode);
*pp++ = setlocalenv("%s=%s", "PHASE", opt);
if (G.startup_PATH)
*pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
}
static int doit(char *str)
{
if (option_mask32 & (OPT_no_act|OPT_verbose)) {
puts(str);
}
if (!(option_mask32 & OPT_no_act)) {
pid_t child;
int status;
fflush_all();
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child = vfork();
if (child < 0) /* failure */
return 0;
if (child == 0) { /* child */
execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
2008-03-19 21:54:17 +05:30
_exit(127);
}
safe_waitpid(child, &status, 0);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
return 0;
}
}
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return 1;
}
2006-02-28 09:23:14 +05:30
static int execute_all(struct interface_defn_t *ifd, const char *opt)
{
/* 'opt' is always short, the longest value is "post-down".
* Can use on-stack buffer instead of xasprintf'ed one.
*/
char buf[sizeof("run-parts /etc/network/if-%s.d")
+ sizeof("post-down")
/*paranoia:*/ + 8
];
int i;
for (i = 0; i < ifd->n_options; i++) {
if (strcmp(ifd->option[i].name, opt) == 0) {
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if (!doit(ifd->option[i].value)) {
return 0;
}
}
}
/* Tested on Debian Squeeze: "standard" ifup runs this without
* checking that directory exists. If it doesn't, run-parts
* complains, and this message _is_ annoyingly visible.
* Don't "fix" this (unless newer Debian does).
*/
sprintf(buf, "run-parts /etc/network/if-%s.d", opt);
return doit(buf);
}
static int check(char *str)
{
return str != NULL;
}
static int iface_up(struct interface_defn_t *iface)
{
if (!iface->method->up(iface, check)) return -1;
set_environ(iface, "start", "pre-up");
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if (!execute_all(iface, "pre-up")) return 0;
if (!iface->method->up(iface, doit)) return 0;
set_environ(iface, "start", "post-up");
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if (!execute_all(iface, "up")) return 0;
return 1;
}
static int iface_down(struct interface_defn_t *iface)
{
if (!iface->method->down(iface, check)) return -1;
set_environ(iface, "stop", "pre-down");
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if (!execute_all(iface, "down")) return 0;
if (!iface->method->down(iface, doit)) return 0;
set_environ(iface, "stop", "post-down");
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if (!execute_all(iface, "post-down")) return 0;
return 1;
}
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
static int popen2(FILE **in, FILE **out, char *command, char *param)
{
char *argv[3] = { command, param, NULL };
struct fd_pair infd, outfd;
pid_t pid;
xpiped_pair(infd);
xpiped_pair(outfd);
fflush_all();
pid = xvfork();
if (pid == 0) {
/* Child */
/* NB: close _first_, then move fds! */
close(infd.wr);
close(outfd.rd);
xmove_fd(infd.rd, 0);
xmove_fd(outfd.wr, 1);
BB_EXECVP_or_die(argv);
}
/* parent */
close(infd.rd);
close(outfd.wr);
*in = xfdopen_for_write(infd.wr);
*out = xfdopen_for_read(outfd.rd);
return pid;
}
static char *run_mapping(char *physical, struct mapping_defn_t *map)
{
FILE *in, *out;
int i, status;
pid_t pid;
char *logical = xstrdup(physical);
/* Run the mapping script. Never fails. */
pid = popen2(&in, &out, map->script, physical);
/* Write mappings to stdin of mapping script. */
for (i = 0; i < map->n_mappings; i++) {
fprintf(in, "%s\n", map->mapping[i]);
}
fclose(in);
safe_waitpid(pid, &status, 0);
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
/* If the mapping script exited successfully, try to
* grab a line of output and use that as the name of the
* logical interface. */
char *new_logical = xmalloc_fgetline(out);
if (new_logical) {
/* If we are able to read a line of output from the script,
* remove any trailing whitespace and use this value
* as the name of the logical interface. */
char *pch = new_logical + strlen(new_logical) - 1;
while (pch >= new_logical && isspace(*pch))
*(pch--) = '\0';
free(logical);
logical = new_logical;
}
}
fclose(out);
return logical;
}
#endif /* FEATURE_IFUPDOWN_MAPPING */
static llist_t *find_iface_state(llist_t *state_list, const char *iface)
{
llist_t *search = state_list;
while (search) {
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
char *after_iface = is_prefixed_with(search->data, iface);
if (after_iface
&& *after_iface == '='
) {
return search;
}
search = search->link;
}
return NULL;
}
/* read the previous state from the state file */
static llist_t *read_iface_state(void)
{
llist_t *state_list = NULL;
FILE *state_fp = fopen_for_read(IFSTATE_FILE_PATH);
if (state_fp) {
char *start, *end_ptr;
while ((start = xmalloc_fgets(state_fp)) != NULL) {
/* We should only need to check for a single character */
end_ptr = start + strcspn(start, " \t\n");
*end_ptr = '\0';
llist_add_to(&state_list, start);
}
fclose(state_fp);
}
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)
{
int (*cmds)(struct interface_defn_t *);
struct interfaces_file_t *defn;
llist_t *target_list = NULL;
const char *interfaces = "/etc/network/interfaces";
bool any_failures = 0;
INIT_G();
G.startup_PATH = getenv("PATH");
G.shell = xstrdup(get_shell_name());
if (ENABLE_IFUP
&& (!ENABLE_IFDOWN || applet_name[2] == 'u')
) {
/* ifup command */
cmds = iface_up;
} else {
cmds = iface_down;
}
getopt32(argv, OPTION_STR, &interfaces);
argv += optind;
if (argv[0]) {
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if (DO_ALL) bb_show_usage();
} else {
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if (!DO_ALL) bb_show_usage();
}
defn = read_interfaces(interfaces, NULL);
/* Create a list of interfaces to work on */
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if (DO_ALL) {
target_list = defn->autointerfaces;
} else {
llist_add_to_end(&target_list, argv[0]);
}
/* Update the interfaces */
while (target_list) {
llist_t *iface_list;
struct interface_defn_t *currif;
char *iface;
char *liface;
char *pch;
bool okay = 0;
int cmds_ret;
bool curr_failure = 0;
iface = xstrdup(target_list->data);
target_list = target_list->link;
pch = strchr(iface, '=');
if (pch) {
*pch = '\0';
liface = xstrdup(pch + 1);
} else {
liface = xstrdup(iface);
}
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if (!FORCE) {
llist_t *state_list = read_iface_state();
const llist_t *iface_state = find_iface_state(state_list, iface);
if (cmds == iface_up) {
/* ifup */
if (iface_state) {
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bb_error_msg("interface %s already configured", iface);
goto next;
}
} else {
/* ifdown */
if (!iface_state) {
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bb_error_msg("interface %s not configured", iface);
goto next;
}
}
llist_free(state_list, free);
}
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
2006-09-23 18:19:01 +05:30
if ((cmds == iface_up) && !NO_MAPPINGS) {
struct mapping_defn_t *currmap;
for (currmap = defn->mappings; currmap; currmap = currmap->next) {
int i;
for (i = 0; i < currmap->n_matches; i++) {
if (fnmatch(currmap->match[i], liface, 0) != 0)
continue;
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if (VERBOSE) {
printf("Running mapping script %s on %s\n", currmap->script, liface);
}
liface = run_mapping(iface, currmap);
break;
}
}
}
#endif
iface_list = defn->ifaces;
while (iface_list) {
currif = (struct interface_defn_t *) iface_list->data;
if (strcmp(liface, currif->iface) == 0) {
char *oldiface = currif->iface;
okay = 1;
currif->iface = iface;
debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
/* Call the cmds function pointer, does either iface_up() or iface_down() */
cmds_ret = cmds(currif);
if (cmds_ret == -1) {
bb_error_msg("don't have all variables for %s/%s",
liface, currif->address_family->name);
any_failures = curr_failure = 1;
} else if (cmds_ret == 0) {
any_failures = curr_failure = 1;
}
currif->iface = oldiface;
}
iface_list = iface_list->link;
}
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if (VERBOSE) {
bb_putchar('\n');
}
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if (!okay && !FORCE) {
bb_error_msg("ignoring unknown interface %s", liface);
any_failures = 1;
} else if (!NO_ACT) {
/* update the state file */
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);
if (cmds == iface_up && !curr_failure) {
char *newiface = xasprintf("%s=%s", iface, liface);
if (!iface_state) {
llist_add_to_end(&state_list, newiface);
} else {
free(iface_state->data);
iface_state->data = newiface;
}
2006-02-28 09:23:14 +05:30
} else {
/* Remove an interface from state_list */
llist_unlink(&state_list, iface_state);
free(llist_pop(&iface_state));
}
2002-12-06 13:40:40 +05:30
/* Actually write the new state */
state = state_list;
while (state) {
if (state->data) {
fprintf(new_state_fp, "%s\n", state->data);
}
state = state->link;
}
fclose(new_state_fp);
xrename(IFSTATE_FILE_PATH".new", IFSTATE_FILE_PATH);
llist_free(state_list, free);
}
next:
free(iface);
free(liface);
}
return any_failures;
}