mirror of
https://github.com/sheumann/hush.git
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1271 lines
31 KiB
C
1271 lines
31 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* ifupdown for busybox
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* Copyright (c) 2002 Glenn McGrath <bug1@iinet.net.au>
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* Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
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*
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* Based on ifupdown v 0.6.4 by Anthony Towns
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* Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
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*
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* Changes to upstream version
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* Remove checks for kernel version, assume kernel version 2.2.0 or better.
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* Lines in the interfaces file cannot wrap.
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* To adhere to the FHS, the default state file is /var/run/ifstate.
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "busybox.h"
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#include <sys/utsname.h>
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#include <fnmatch.h>
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#include <getopt.h>
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#define MAX_OPT_DEPTH 10
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#define EUNBALBRACK 10001
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#define EUNDEFVAR 10002
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#define EUNBALPER 10000
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#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
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#define MAX_INTERFACE_LENGTH 10
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#endif
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#define debug_noise(fmt, args...)
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/* Forward declaration */
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struct interface_defn_t;
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typedef int execfn(char *command);
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struct method_t
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{
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char *name;
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int (*up)(struct interface_defn_t *ifd, execfn *e);
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int (*down)(struct interface_defn_t *ifd, execfn *e);
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};
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struct address_family_t
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{
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char *name;
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int n_methods;
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const struct method_t *method;
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};
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struct mapping_defn_t
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{
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struct mapping_defn_t *next;
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int max_matches;
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int n_matches;
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char **match;
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char *script;
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int max_mappings;
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int n_mappings;
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char **mapping;
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};
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struct variable_t
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{
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char *name;
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char *value;
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};
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struct interface_defn_t
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{
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const struct address_family_t *address_family;
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const struct method_t *method;
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char *iface;
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int max_options;
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int n_options;
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struct variable_t *option;
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};
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struct interfaces_file_t
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{
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llist_t *autointerfaces;
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llist_t *ifaces;
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struct mapping_defn_t *mappings;
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};
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#define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
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enum {
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OPT_do_all = 0x1,
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OPT_no_act = 0x2,
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OPT_verbose = 0x4,
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OPT_force = 0x8,
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OPT_no_mappings = 0x10,
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};
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#define DO_ALL (option_mask32 & OPT_do_all)
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#define NO_ACT (option_mask32 & OPT_no_act)
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#define VERBOSE (option_mask32 & OPT_verbose)
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#define FORCE (option_mask32 & OPT_force)
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#define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
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static char **__myenviron;
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static char *startup_PATH;
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#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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static unsigned count_bits(unsigned a)
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{
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unsigned result;
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result = (a & 0x55) + ((a >> 1) & 0x55);
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result = (result & 0x33) + ((result >> 2) & 0x33);
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return (result & 0x0F) + ((result >> 4) & 0x0F);
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}
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static int count_netmask_bits(char *dotted_quad)
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{
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unsigned result, a, b, c, d;
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/* Found a netmask... Check if it is dotted quad */
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if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
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return -1;
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// FIXME: will be confused by e.g. 255.0.255.0
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result = count_bits(a);
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result += count_bits(b);
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result += count_bits(c);
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result += count_bits(d);
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return (int)result;
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}
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#endif
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static void addstr(char **bufp, const char *str, size_t str_length)
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{
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/* xasprintf trick will be smaller, but we are often
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* called with str_length == 1 - don't want to have
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* THAT much of malloc/freeing! */
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char *buf = *bufp;
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int len = (buf ? strlen(buf) : 0);
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str_length++;
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buf = xrealloc(buf, len + str_length);
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/* copies at most str_length-1 chars! */
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safe_strncpy(buf + len, str, str_length);
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*bufp = buf;
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}
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static int strncmpz(const char *l, const char *r, size_t llen)
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{
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int i = strncmp(l, r, llen);
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if (i == 0)
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return -r[llen];
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return i;
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}
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static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
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{
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int i;
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if (strncmpz(id, "iface", idlen) == 0) {
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char *result;
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static char label_buf[20];
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safe_strncpy(label_buf, ifd->iface, sizeof(label_buf));
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result = strchr(label_buf, ':');
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if (result) {
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*result = '\0';
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}
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return label_buf;
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}
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if (strncmpz(id, "label", idlen) == 0) {
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return ifd->iface;
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}
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for (i = 0; i < ifd->n_options; i++) {
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if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
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return ifd->option[i].value;
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}
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}
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return NULL;
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}
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static char *parse(const char *command, struct interface_defn_t *ifd)
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{
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char *result = NULL;
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size_t old_pos[MAX_OPT_DEPTH] = { 0 };
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int okay[MAX_OPT_DEPTH] = { 1 };
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int opt_depth = 1;
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while (*command) {
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switch (*command) {
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default:
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addstr(&result, command, 1);
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command++;
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break;
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case '\\':
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if (command[1]) {
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addstr(&result, command + 1, 1);
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command += 2;
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} else {
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addstr(&result, command, 1);
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command++;
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}
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break;
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case '[':
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if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
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old_pos[opt_depth] = strlen(result);
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okay[opt_depth] = 1;
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opt_depth++;
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command += 2;
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} else {
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addstr(&result, "[", 1);
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command++;
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}
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break;
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case ']':
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if (command[1] == ']' && opt_depth > 1) {
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opt_depth--;
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if (!okay[opt_depth]) {
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result[old_pos[opt_depth]] = '\0';
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}
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command += 2;
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} else {
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addstr(&result, "]", 1);
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command++;
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}
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break;
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case '%':
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{
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char *nextpercent;
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char *varvalue;
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command++;
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nextpercent = strchr(command, '%');
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if (!nextpercent) {
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errno = EUNBALPER;
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free(result);
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return NULL;
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}
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varvalue = get_var(command, nextpercent - command, ifd);
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if (varvalue) {
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addstr(&result, varvalue, strlen(varvalue));
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} else {
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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/* Sigh... Add a special case for 'ip' to convert from
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* dotted quad to bit count style netmasks. */
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if (strncmp(command, "bnmask", 6)==0) {
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unsigned res;
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varvalue = get_var("netmask", 7, ifd);
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if (varvalue && (res = count_netmask_bits(varvalue)) > 0) {
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const char *argument = utoa(res);
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addstr(&result, argument, strlen(argument));
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command = nextpercent + 1;
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break;
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}
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}
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#endif
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okay[opt_depth - 1] = 0;
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}
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command = nextpercent + 1;
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}
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break;
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}
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}
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if (opt_depth > 1) {
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errno = EUNBALBRACK;
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free(result);
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return NULL;
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}
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if (!okay[0]) {
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errno = EUNDEFVAR;
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free(result);
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return NULL;
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}
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return result;
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}
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/* execute() returns 1 for success and 0 for failure */
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static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
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{
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char *out;
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int ret;
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out = parse(command, ifd);
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if (!out) {
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return 0;
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}
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ret = (*exec)(out);
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free(out);
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if (ret != 1) {
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return 0;
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}
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return 1;
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}
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#endif
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#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
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static int loopback_up6(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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int result;
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result = execute("ip addr add ::1 dev %iface%", ifd, exec);
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result += execute("ip link set %iface% up", ifd, exec);
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return ((result == 2) ? 2 : 0);
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#else
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return execute("ifconfig %iface% add ::1", ifd, exec);
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#endif
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}
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static int loopback_down6(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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return execute("ip link set %iface% down", ifd, exec);
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#else
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return execute("ifconfig %iface% del ::1", ifd, exec);
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#endif
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}
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static int static_up6(struct interface_defn_t *ifd, execfn *exec)
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{
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int result;
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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result = execute("ip addr add %address%/%netmask% dev %iface% [[label %label%]]", ifd, exec);
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result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
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result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
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#else
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result = execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec);
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result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
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result += execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec);
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#endif
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return ((result == 3) ? 3 : 0);
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}
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static int static_down6(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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return execute("ip link set %iface% down", ifd, exec);
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#else
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return execute("ifconfig %iface% down", ifd, exec);
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#endif
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}
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
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{
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int result;
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result = execute("ip tunnel add %iface% mode sit remote "
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"%endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec);
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result += execute("ip link set %iface% up", ifd, exec);
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result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
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result += execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec);
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return ((result == 4) ? 4 : 0);
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}
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static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
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{
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return execute("ip tunnel del %iface%", ifd, exec);
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}
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#endif
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static const struct method_t methods6[] = {
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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{ "v4tunnel", v4tunnel_up, v4tunnel_down, },
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#endif
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{ "static", static_up6, static_down6, },
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{ "loopback", loopback_up6, loopback_down6, },
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};
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static const struct address_family_t addr_inet6 = {
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"inet6",
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sizeof(methods6) / sizeof(struct method_t),
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methods6
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};
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#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
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#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
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static int loopback_up(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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int result;
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result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
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result += execute("ip link set %iface% up", ifd, exec);
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return ((result == 2) ? 2 : 0);
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#else
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return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
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#endif
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}
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static int loopback_down(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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int result;
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result = execute("ip addr flush dev %iface%", ifd, exec);
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result += execute("ip link set %iface% down", ifd, exec);
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return ((result == 2) ? 2 : 0);
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#else
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return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
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#endif
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}
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static int static_up(struct interface_defn_t *ifd, execfn *exec)
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{
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int result;
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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result = execute("ip addr add %address%/%bnmask% [[broadcast %broadcast%]] "
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"dev %iface% [[peer %pointopoint%]] [[label %label%]]", ifd, exec);
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result += execute("ip link set [[mtu %mtu%]] [[address %hwaddress%]] %iface% up", ifd, exec);
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result += execute("[[ ip route add default via %gateway% dev %iface% ]]", ifd, exec);
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return ((result == 3) ? 3 : 0);
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#else
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/* ifconfig said to set iface up before it processes hw %hwaddress%,
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* which then of course fails. Thus we run two separate ifconfig */
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result = execute("ifconfig %iface% [[hw %hwaddress%]] [[media %media%]] [[mtu %mtu%]] up",
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ifd, exec);
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result += execute("ifconfig %iface% %address% netmask %netmask% "
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"[[broadcast %broadcast%]] [[pointopoint %pointopoint%]] ",
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ifd, exec);
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result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec);
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return ((result == 3) ? 3 : 0);
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#endif
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}
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static int static_down(struct interface_defn_t *ifd, execfn *exec)
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{
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int result;
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#ifdef CONFIG_FEATURE_IFUPDOWN_IP
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result = execute("ip addr flush dev %iface%", ifd, exec);
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result += execute("ip link set %iface% down", ifd, exec);
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#else
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result = execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec);
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result += execute("ifconfig %iface% down", ifd, exec);
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#endif
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return ((result == 2) ? 2 : 0);
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}
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#ifndef CONFIG_APP_UDHCPC
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struct dhcp_client_t
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{
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const char *name;
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const char *startcmd;
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const char *stopcmd;
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};
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static const struct dhcp_client_t ext_dhcp_clients[] = {
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{ "udhcpc",
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"udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]] [[-s %script%]]",
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"kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
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},
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{ "pump",
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"pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]",
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"pump -i %iface% -k",
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},
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{ "dhclient",
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"dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
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"kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
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},
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{ "dhcpcd",
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"dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%",
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"dhcpcd -k %iface%",
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},
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};
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#endif
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static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_APP_UDHCPC
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return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
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"-i %iface% [[-H %hostname%]] [[-c %clientid%]] [[-s %script%]]",
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ifd, exec);
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#else
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int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
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for (i = 0; i < nclients; i++) {
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if (exists_execable(ext_dhcp_clients[i].name))
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return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
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}
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bb_error_msg("no dhcp clients found");
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return 0;
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#endif
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}
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static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
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{
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#ifdef CONFIG_APP_UDHCPC
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return execute("kill -TERM "
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"`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
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#else
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int i, nclients = sizeof(ext_dhcp_clients) / sizeof(ext_dhcp_clients[0]);
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for (i = 0; i < nclients; i++) {
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if (exists_execable(ext_dhcp_clients[i].name))
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return execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
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}
|
|
bb_error_msg("no dhcp clients found, using static interface shutdown");
|
|
return static_down(ifd, exec);
|
|
#endif
|
|
}
|
|
|
|
static int manual_up_down(struct interface_defn_t *ifd, execfn *exec)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int 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 ppp_up(struct interface_defn_t *ifd, execfn *exec)
|
|
{
|
|
return execute("pon [[%provider%]]", ifd, exec);
|
|
}
|
|
|
|
static int ppp_down(struct interface_defn_t *ifd, execfn *exec)
|
|
{
|
|
return execute("poff [[%provider%]]", ifd, exec);
|
|
}
|
|
|
|
static int wvdial_up(struct interface_defn_t *ifd, execfn *exec)
|
|
{
|
|
return execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial "
|
|
"-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec);
|
|
}
|
|
|
|
static int wvdial_down(struct interface_defn_t *ifd, execfn *exec)
|
|
{
|
|
return execute("/sbin/start-stop-daemon --stop -x /usr/bin/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",
|
|
sizeof(methods) / sizeof(struct method_t),
|
|
methods
|
|
};
|
|
|
|
#endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */
|
|
|
|
static char *next_word(char **buf)
|
|
{
|
|
unsigned short length;
|
|
char *word;
|
|
|
|
if (!buf || !*buf || !**buf) {
|
|
return NULL;
|
|
}
|
|
|
|
/* Skip over leading whitespace */
|
|
word = skip_whitespace(*buf);
|
|
|
|
/* Skip over comments */
|
|
if (*word == '#') {
|
|
return NULL;
|
|
}
|
|
|
|
/* Find the length of this word */
|
|
length = strcspn(word, " \t\n");
|
|
if (length == 0) {
|
|
return NULL;
|
|
}
|
|
*buf = word + length;
|
|
/*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */
|
|
if (**buf) {
|
|
**buf = '\0';
|
|
(*buf)++;
|
|
}
|
|
|
|
return word;
|
|
}
|
|
|
|
static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
|
|
{
|
|
int i;
|
|
|
|
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;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
for (i = 0; i < af->n_methods; i++) {
|
|
if (strcmp(af->method[i].name, name) == 0) {
|
|
return &af->method[i];
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const llist_t *find_list_string(const llist_t *list, const char *string)
|
|
{
|
|
if (string == NULL)
|
|
return NULL;
|
|
|
|
while (list) {
|
|
if (strcmp(list->data, string) == 0) {
|
|
return list;
|
|
}
|
|
list = list->link;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct interfaces_file_t *read_interfaces(const char *filename)
|
|
{
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
|
|
struct mapping_defn_t *currmap = NULL;
|
|
#endif
|
|
struct interface_defn_t *currif = NULL;
|
|
struct interfaces_file_t *defn;
|
|
FILE *f;
|
|
char *firstword;
|
|
char *buf;
|
|
|
|
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
|
|
|
|
defn = xzalloc(sizeof(struct interfaces_file_t));
|
|
|
|
f = xfopen(filename, "r");
|
|
|
|
while ((buf = xmalloc_getline(f)) != NULL) {
|
|
char *buf_ptr = buf;
|
|
|
|
firstword = next_word(&buf_ptr);
|
|
if (firstword == NULL) {
|
|
free(buf);
|
|
continue; /* blank line */
|
|
}
|
|
|
|
if (strcmp(firstword, "mapping") == 0) {
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
|
|
currmap = xzalloc(sizeof(struct mapping_defn_t));
|
|
|
|
while ((firstword = next_word(&buf_ptr)) != NULL) {
|
|
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;
|
|
{
|
|
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(firstword, "iface") == 0) {
|
|
static const struct address_family_t *const addr_fams[] = {
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV4
|
|
&addr_inet,
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_IPV6
|
|
&addr_inet6,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
char *iface_name;
|
|
char *address_family_name;
|
|
char *method_name;
|
|
llist_t *iface_list;
|
|
|
|
currif = xzalloc(sizeof(struct interface_defn_t));
|
|
iface_name = next_word(&buf_ptr);
|
|
address_family_name = next_word(&buf_ptr);
|
|
method_name = next_word(&buf_ptr);
|
|
|
|
if (buf_ptr == NULL) {
|
|
bb_error_msg("too few parameters for line \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
|
|
/* ship any trailing whitespace */
|
|
buf_ptr = skip_whitespace(buf_ptr);
|
|
|
|
if (buf_ptr[0] != '\0') {
|
|
bb_error_msg("too many parameters \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
|
|
currif->iface = xstrdup(iface_name);
|
|
|
|
currif->address_family = get_address_family(addr_fams, address_family_name);
|
|
if (!currif->address_family) {
|
|
bb_error_msg("unknown address type \"%s\"", address_family_name);
|
|
return NULL;
|
|
}
|
|
|
|
currif->method = get_method(currif->address_family, method_name);
|
|
if (!currif->method) {
|
|
bb_error_msg("unknown method \"%s\"", method_name);
|
|
return NULL;
|
|
}
|
|
|
|
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("duplicate interface \"%s\"", tmp->iface);
|
|
return NULL;
|
|
}
|
|
}
|
|
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(firstword, "auto") == 0) {
|
|
while ((firstword = next_word(&buf_ptr)) != NULL) {
|
|
|
|
/* Check the interface isnt already listed */
|
|
if (find_list_string(defn->autointerfaces, firstword)) {
|
|
bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
|
|
}
|
|
|
|
/* Add the interface to the list */
|
|
llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword));
|
|
debug_noise("\nauto %s\n", firstword);
|
|
}
|
|
currently_processing = NONE;
|
|
} else {
|
|
switch (currently_processing) {
|
|
case IFACE:
|
|
{
|
|
int i;
|
|
|
|
if (strlen(buf_ptr) == 0) {
|
|
bb_error_msg("option with empty value \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
|
|
if (strcmp(firstword, "up") != 0
|
|
&& strcmp(firstword, "down") != 0
|
|
&& strcmp(firstword, "pre-up") != 0
|
|
&& strcmp(firstword, "post-down") != 0) {
|
|
for (i = 0; i < currif->n_options; i++) {
|
|
if (strcmp(currif->option[i].name, firstword) == 0) {
|
|
bb_error_msg("duplicate option \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (currif->n_options >= currif->max_options) {
|
|
struct variable_t *opt;
|
|
|
|
currif->max_options = currif->max_options + 10;
|
|
opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options);
|
|
currif->option = opt;
|
|
}
|
|
currif->option[currif->n_options].name = xstrdup(firstword);
|
|
currif->option[currif->n_options].value = xstrdup(buf_ptr);
|
|
if (!currif->option[currif->n_options].name) {
|
|
perror(filename);
|
|
return NULL;
|
|
}
|
|
if (!currif->option[currif->n_options].value) {
|
|
perror(filename);
|
|
return NULL;
|
|
}
|
|
debug_noise("\t%s=%s\n", currif->option[currif->n_options].name,
|
|
currif->option[currif->n_options].value);
|
|
currif->n_options++;
|
|
break;
|
|
case MAPPING:
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
|
|
if (strcmp(firstword, "script") == 0) {
|
|
if (currmap->script != NULL) {
|
|
bb_error_msg("duplicate script in mapping \"%s\"", buf);
|
|
return NULL;
|
|
} else {
|
|
currmap->script = xstrdup(next_word(&buf_ptr));
|
|
}
|
|
} 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(next_word(&buf_ptr));
|
|
currmap->n_mappings++;
|
|
} else {
|
|
bb_error_msg("misplaced option \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
break;
|
|
case NONE:
|
|
default:
|
|
bb_error_msg("misplaced option \"%s\"", buf);
|
|
return NULL;
|
|
}
|
|
}
|
|
free(buf);
|
|
}
|
|
if (ferror(f) != 0) {
|
|
bb_perror_msg_and_die("%s", filename);
|
|
}
|
|
fclose(f);
|
|
|
|
return defn;
|
|
}
|
|
|
|
static char *setlocalenv(char *format, const char *name, const char *value)
|
|
{
|
|
char *result;
|
|
char *here;
|
|
char *there;
|
|
|
|
result = xasprintf(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, strlen(there) + 1);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void set_environ(struct interface_defn_t *iface, const char *mode)
|
|
{
|
|
char **environend;
|
|
int i;
|
|
const int n_env_entries = iface->n_options + 5;
|
|
char **ppch;
|
|
|
|
if (__myenviron != NULL) {
|
|
for (ppch = __myenviron; *ppch; ppch++) {
|
|
free(*ppch);
|
|
*ppch = NULL;
|
|
}
|
|
free(__myenviron);
|
|
}
|
|
__myenviron = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ ));
|
|
environend = __myenviron;
|
|
|
|
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++) = setlocalenv("%s=%s", "IFACE", iface->iface);
|
|
*(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
|
|
*(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
|
|
*(environend++) = setlocalenv("%s=%s", "MODE", mode);
|
|
*(environend++) = setlocalenv("%s=%s", "PATH", 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(NULL);
|
|
switch (child = fork()) {
|
|
case -1: /* failure */
|
|
return 0;
|
|
case 0: /* child */
|
|
execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron);
|
|
exit(127);
|
|
}
|
|
waitpid(child, &status, 0);
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int execute_all(struct interface_defn_t *ifd, const char *opt)
|
|
{
|
|
int i;
|
|
char *buf;
|
|
for (i = 0; i < ifd->n_options; i++) {
|
|
if (strcmp(ifd->option[i].name, opt) == 0) {
|
|
if (!doit(ifd->option[i].value)) {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
|
|
if (doit(buf) != 1) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
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");
|
|
if (!execute_all(iface, "pre-up")) return 0;
|
|
if (!iface->method->up(iface, doit)) return 0;
|
|
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");
|
|
if (!execute_all(iface, "down")) return 0;
|
|
if (!iface->method->down(iface, doit)) return 0;
|
|
if (!execute_all(iface, "post-down")) return 0;
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
|
|
static int popen2(FILE **in, FILE **out, char *command, ...)
|
|
{
|
|
va_list ap;
|
|
char *argv[11] = { command };
|
|
int argc;
|
|
int infd[2], outfd[2];
|
|
pid_t pid;
|
|
|
|
argc = 1;
|
|
va_start(ap, command);
|
|
while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
|
|
argc++;
|
|
}
|
|
argv[argc] = NULL; /* make sure */
|
|
va_end(ap);
|
|
|
|
if (pipe(infd) != 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (pipe(outfd) != 0) {
|
|
close(infd[0]);
|
|
close(infd[1]);
|
|
return 0;
|
|
}
|
|
|
|
fflush(NULL);
|
|
switch (pid = fork()) {
|
|
case -1: /* failure */
|
|
close(infd[0]);
|
|
close(infd[1]);
|
|
close(outfd[0]);
|
|
close(outfd[1]);
|
|
return 0;
|
|
case 0: /* child */
|
|
dup2(infd[0], 0);
|
|
dup2(outfd[1], 1);
|
|
close(infd[0]);
|
|
close(infd[1]);
|
|
close(outfd[0]);
|
|
close(outfd[1]);
|
|
execvp(command, argv);
|
|
exit(127);
|
|
default: /* parent */
|
|
*in = fdopen(infd[1], "w");
|
|
*out = fdopen(outfd[0], "r");
|
|
close(infd[0]);
|
|
close(outfd[1]);
|
|
return pid;
|
|
}
|
|
/* unreached */
|
|
}
|
|
|
|
static 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. */
|
|
pid = popen2(&in, &out, map->script, physical, NULL);
|
|
|
|
/* popen2() returns 0 on failure. */
|
|
if (pid == 0)
|
|
return logical;
|
|
|
|
/* Write mappings to stdin of mapping script. */
|
|
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 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 = (char *)xmalloc(MAX_INTERFACE_LENGTH);
|
|
|
|
if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
|
|
/* 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;
|
|
} else {
|
|
/* If we are UNABLE to read a line of output, discard our
|
|
* freshly allocated memory. */
|
|
free(new_logical);
|
|
}
|
|
}
|
|
|
|
fclose(out);
|
|
|
|
return logical;
|
|
}
|
|
#endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */
|
|
|
|
static llist_t *find_iface_state(llist_t *state_list, const char *iface)
|
|
{
|
|
unsigned short iface_len = strlen(iface);
|
|
llist_t *search = state_list;
|
|
|
|
while (search) {
|
|
if ((strncmp(search->data, iface, iface_len) == 0) &&
|
|
(search->data[iface_len] == '=')) {
|
|
return search;
|
|
}
|
|
search = search->link;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int ifupdown_main(int argc, char **argv)
|
|
{
|
|
static const char statefile[] = "/var/run/ifstate";
|
|
|
|
int (*cmds)(struct interface_defn_t *) = NULL;
|
|
struct interfaces_file_t *defn;
|
|
llist_t *state_list = NULL;
|
|
llist_t *target_list = NULL;
|
|
const char *interfaces = "/etc/network/interfaces";
|
|
int any_failures = 0;
|
|
|
|
if (applet_name[2] == 'u') {
|
|
/* ifup command */
|
|
cmds = iface_up;
|
|
} else {
|
|
/* ifdown command */
|
|
cmds = iface_down;
|
|
}
|
|
|
|
getopt32(argc, argv, OPTION_STR, &interfaces);
|
|
if (argc - optind > 0) {
|
|
if (DO_ALL) bb_show_usage();
|
|
} else
|
|
if (!DO_ALL) bb_show_usage();
|
|
|
|
debug_noise("reading %s file:\n", interfaces);
|
|
defn = read_interfaces(interfaces);
|
|
debug_noise("\ndone reading %s\n\n", interfaces);
|
|
|
|
if (!defn) {
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
startup_PATH = getenv("PATH");
|
|
if (!startup_PATH) startup_PATH = "";
|
|
|
|
/* Create a list of interfaces to work on */
|
|
if (DO_ALL) {
|
|
if (cmds == iface_up) {
|
|
target_list = defn->autointerfaces;
|
|
} else {
|
|
/* iface_down */
|
|
const llist_t *list = state_list;
|
|
while (list) {
|
|
llist_add_to_end(&target_list, xstrdup(list->data));
|
|
list = list->link;
|
|
}
|
|
target_list = defn->autointerfaces;
|
|
}
|
|
} else {
|
|
llist_add_to_end(&target_list, argv[optind]);
|
|
}
|
|
|
|
|
|
/* Update the interfaces */
|
|
while (target_list) {
|
|
llist_t *iface_list;
|
|
struct interface_defn_t *currif;
|
|
char *iface;
|
|
char *liface;
|
|
char *pch;
|
|
int okay = 0;
|
|
int cmds_ret;
|
|
|
|
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);
|
|
}
|
|
|
|
if (!FORCE) {
|
|
const llist_t *iface_state = find_iface_state(state_list, iface);
|
|
|
|
if (cmds == iface_up) {
|
|
/* ifup */
|
|
if (iface_state) {
|
|
bb_error_msg("interface %s already configured", iface);
|
|
continue;
|
|
}
|
|
} else {
|
|
/* ifdown */
|
|
if (iface_state) {
|
|
bb_error_msg("interface %s not configured", iface);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
|
|
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;
|
|
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 seem to have all the variables for %s/%s",
|
|
liface, currif->address_family->name);
|
|
any_failures += 1;
|
|
} else if (cmds_ret == 0) {
|
|
any_failures += 1;
|
|
}
|
|
|
|
currif->iface = oldiface;
|
|
}
|
|
iface_list = iface_list->link;
|
|
}
|
|
if (VERBOSE) {
|
|
puts("");
|
|
}
|
|
|
|
if (!okay && !FORCE) {
|
|
bb_error_msg("ignoring unknown interface %s", liface);
|
|
any_failures += 1;
|
|
} else {
|
|
llist_t *iface_state = find_iface_state(state_list, iface);
|
|
|
|
if (cmds == iface_up) {
|
|
char *newiface = xasprintf("%s=%s", iface, liface);
|
|
if (iface_state == NULL) {
|
|
llist_add_to_end(&state_list, newiface);
|
|
} else {
|
|
free(iface_state->data);
|
|
iface_state->data = newiface;
|
|
}
|
|
} else {
|
|
/* Remove an interface from the linked list */
|
|
free(llist_pop(&iface_state));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Actually write the new state */
|
|
if (!NO_ACT) {
|
|
FILE *state_fp = NULL;
|
|
|
|
state_fp = xfopen(statefile, "w");
|
|
while (state_list) {
|
|
if (state_list->data) {
|
|
fputs(state_list->data, state_fp);
|
|
fputc('\n', state_fp);
|
|
}
|
|
state_list = state_list->link;
|
|
}
|
|
fclose(state_fp);
|
|
}
|
|
|
|
if (any_failures)
|
|
return 1;
|
|
return 0;
|
|
}
|