[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * ifupdown for busybox
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| 4 | * Copyright (c) 2002 Glenn McGrath
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| 5 | * Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Based on ifupdown v 0.6.4 by Anthony Towns
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| 8 | * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
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| 9 | *
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| 10 | * Changes to upstream version
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| 11 | * Remove checks for kernel version, assume kernel version 2.2.0 or better.
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| 12 | * Lines in the interfaces file cannot wrap.
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| 13 | * To adhere to the FHS, the default state file is /var/run/ifstate
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| 14 | * (defined via CONFIG_IFUPDOWN_IFSTATE_PATH) and can be overridden by build
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| 15 | * configuration.
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| 16 | *
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| 17 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 18 | */
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| 19 |
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| 20 | #include "libbb.h"
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| 21 | /* After libbb.h, since it needs sys/types.h on some systems */
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| 22 | #include <sys/utsname.h>
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| 23 | #include <fnmatch.h>
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| 24 |
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| 25 | #define MAX_OPT_DEPTH 10
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| 26 | #define EUNBALBRACK 10001
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| 27 | #define EUNDEFVAR 10002
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| 28 | #define EUNBALPER 10000
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| 29 |
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| 30 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
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| 31 | #define MAX_INTERFACE_LENGTH 10
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| 32 | #endif
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| 33 |
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| 34 | #define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
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| 35 |
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| 36 | #define debug_noise(args...) /*fprintf(stderr, args)*/
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| 37 |
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| 38 | /* Forward declaration */
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| 39 | struct interface_defn_t;
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| 40 |
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| 41 | typedef int execfn(char *command);
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| 42 |
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| 43 | struct method_t {
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| 44 | const char *name;
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| 45 | int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
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| 46 | int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
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| 47 | };
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| 48 |
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| 49 | struct address_family_t {
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| 50 | const char *name;
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| 51 | int n_methods;
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| 52 | const struct method_t *method;
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| 53 | };
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| 54 |
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| 55 | struct mapping_defn_t {
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| 56 | struct mapping_defn_t *next;
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| 57 |
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| 58 | int max_matches;
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| 59 | int n_matches;
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| 60 | char **match;
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| 61 |
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| 62 | char *script;
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| 63 |
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| 64 | int max_mappings;
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| 65 | int n_mappings;
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| 66 | char **mapping;
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| 67 | };
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| 68 |
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| 69 | struct variable_t {
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| 70 | char *name;
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| 71 | char *value;
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| 72 | };
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| 73 |
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| 74 | struct interface_defn_t {
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| 75 | const struct address_family_t *address_family;
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| 76 | const struct method_t *method;
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| 77 |
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| 78 | char *iface;
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| 79 | int max_options;
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| 80 | int n_options;
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| 81 | struct variable_t *option;
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| 82 | };
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| 83 |
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| 84 | struct interfaces_file_t {
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| 85 | llist_t *autointerfaces;
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| 86 | llist_t *ifaces;
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| 87 | struct mapping_defn_t *mappings;
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| 88 | };
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| 89 |
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| 90 |
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| 91 | #define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
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| 92 | enum {
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| 93 | OPT_do_all = 0x1,
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| 94 | OPT_no_act = 0x2,
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| 95 | OPT_verbose = 0x4,
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| 96 | OPT_force = 0x8,
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| 97 | OPT_no_mappings = 0x10,
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| 98 | };
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| 99 | #define DO_ALL (option_mask32 & OPT_do_all)
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| 100 | #define NO_ACT (option_mask32 & OPT_no_act)
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| 101 | #define VERBOSE (option_mask32 & OPT_verbose)
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| 102 | #define FORCE (option_mask32 & OPT_force)
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| 103 | #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
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| 104 |
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| 105 |
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| 106 | struct globals {
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| 107 | char **my_environ;
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| 108 | const char *startup_PATH;
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| 109 | } FIX_ALIASING;
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| 110 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 111 | #define INIT_G() do { } while (0)
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| 112 |
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| 113 |
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| 114 | #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
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| 115 |
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| 116 | static void addstr(char **bufp, const char *str, size_t str_length)
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| 117 | {
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| 118 | /* xasprintf trick will be smaller, but we are often
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| 119 | * called with str_length == 1 - don't want to have
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| 120 | * THAT much of malloc/freeing! */
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| 121 | char *buf = *bufp;
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| 122 | int len = (buf ? strlen(buf) : 0);
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| 123 | str_length++;
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| 124 | buf = xrealloc(buf, len + str_length);
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| 125 | /* copies at most str_length-1 chars! */
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| 126 | safe_strncpy(buf + len, str, str_length);
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| 127 | *bufp = buf;
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| 128 | }
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| 129 |
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| 130 | static int strncmpz(const char *l, const char *r, size_t llen)
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| 131 | {
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| 132 | int i = strncmp(l, r, llen);
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| 133 |
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| 134 | if (i == 0)
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| 135 | return - (unsigned char)r[llen];
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| 136 | return i;
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| 137 | }
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| 138 |
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| 139 | static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
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| 140 | {
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| 141 | int i;
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| 142 |
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| 143 | if (strncmpz(id, "iface", idlen) == 0) {
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| 144 | // ubuntu's ifup doesn't do this:
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| 145 | //static char *label_buf;
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| 146 | //char *result;
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| 147 | //free(label_buf);
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| 148 | //label_buf = xstrdup(ifd->iface);
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| 149 | // Remove virtual iface suffix
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| 150 | //result = strchrnul(label_buf, ':');
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| 151 | //*result = '\0';
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| 152 | //return label_buf;
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| 153 |
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| 154 | return ifd->iface;
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| 155 | }
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| 156 | if (strncmpz(id, "label", idlen) == 0) {
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| 157 | return ifd->iface;
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| 158 | }
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| 159 | for (i = 0; i < ifd->n_options; i++) {
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| 160 | if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
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| 161 | return ifd->option[i].value;
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| 162 | }
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| 163 | }
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| 164 | return NULL;
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| 165 | }
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| 166 |
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| 167 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 168 | static int count_netmask_bits(const char *dotted_quad)
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| 169 | {
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| 170 | // int result;
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| 171 | // unsigned a, b, c, d;
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| 172 | // /* Found a netmask... Check if it is dotted quad */
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| 173 | // if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
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| 174 | // return -1;
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| 175 | // if ((a|b|c|d) >> 8)
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| 176 | // return -1; /* one of numbers is >= 256 */
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| 177 | // d |= (a << 24) | (b << 16) | (c << 8); /* IP */
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| 178 | // d = ~d; /* 11110000 -> 00001111 */
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| 179 |
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| 180 | /* Shorter version */
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| 181 | int result;
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| 182 | struct in_addr ip;
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| 183 | unsigned d;
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| 184 |
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| 185 | if (inet_aton(dotted_quad, &ip) == 0)
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| 186 | return -1; /* malformed dotted IP */
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| 187 | d = ntohl(ip.s_addr); /* IP in host order */
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| 188 | d = ~d; /* 11110000 -> 00001111 */
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| 189 | if (d & (d+1)) /* check that it is in 00001111 form */
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| 190 | return -1; /* no it is not */
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| 191 | result = 32;
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| 192 | while (d) {
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| 193 | d >>= 1;
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| 194 | result--;
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| 195 | }
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| 196 | return result;
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| 197 | }
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| 198 | # endif
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| 199 |
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| 200 | static char *parse(const char *command, struct interface_defn_t *ifd)
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| 201 | {
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| 202 | size_t old_pos[MAX_OPT_DEPTH] = { 0 };
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| 203 | int okay[MAX_OPT_DEPTH] = { 1 };
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| 204 | int opt_depth = 1;
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| 205 | char *result = NULL;
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| 206 |
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| 207 | while (*command) {
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| 208 | switch (*command) {
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| 209 | default:
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| 210 | addstr(&result, command, 1);
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| 211 | command++;
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| 212 | break;
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| 213 | case '\\':
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| 214 | if (command[1]) {
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| 215 | addstr(&result, command + 1, 1);
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| 216 | command += 2;
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| 217 | } else {
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| 218 | addstr(&result, command, 1);
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| 219 | command++;
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| 220 | }
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| 221 | break;
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| 222 | case '[':
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| 223 | if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
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| 224 | old_pos[opt_depth] = result ? strlen(result) : 0;
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| 225 | okay[opt_depth] = 1;
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| 226 | opt_depth++;
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| 227 | command += 2;
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| 228 | } else {
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| 229 | addstr(&result, "[", 1);
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| 230 | command++;
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| 231 | }
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| 232 | break;
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| 233 | case ']':
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| 234 | if (command[1] == ']' && opt_depth > 1) {
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| 235 | opt_depth--;
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| 236 | if (!okay[opt_depth]) {
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| 237 | result[old_pos[opt_depth]] = '\0';
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| 238 | }
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| 239 | command += 2;
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| 240 | } else {
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| 241 | addstr(&result, "]", 1);
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| 242 | command++;
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| 243 | }
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| 244 | break;
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| 245 | case '%':
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| 246 | {
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| 247 | char *nextpercent;
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| 248 | char *varvalue;
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| 249 |
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| 250 | command++;
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| 251 | nextpercent = strchr(command, '%');
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| 252 | if (!nextpercent) {
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| 253 | errno = EUNBALPER;
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| 254 | free(result);
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| 255 | return NULL;
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| 256 | }
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| 257 |
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| 258 | varvalue = get_var(command, nextpercent - command, ifd);
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| 259 |
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| 260 | if (varvalue) {
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| 261 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 262 | /* "hwaddress <class> <address>":
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| 263 | * unlike ifconfig, ip doesnt want <class>
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| 264 | * (usually "ether" keyword). Skip it. */
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| 265 | if (strncmp(command, "hwaddress", 9) == 0) {
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| 266 | varvalue = skip_whitespace(skip_non_whitespace(varvalue));
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| 267 | }
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| 268 | # endif
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| 269 | addstr(&result, varvalue, strlen(varvalue));
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| 270 | } else {
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| 271 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 272 | /* Sigh... Add a special case for 'ip' to convert from
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| 273 | * dotted quad to bit count style netmasks. */
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| 274 | if (strncmp(command, "bnmask", 6) == 0) {
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| 275 | unsigned res;
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| 276 | varvalue = get_var("netmask", 7, ifd);
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| 277 | if (varvalue) {
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| 278 | res = count_netmask_bits(varvalue);
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| 279 | if (res > 0) {
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| 280 | const char *argument = utoa(res);
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| 281 | addstr(&result, argument, strlen(argument));
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| 282 | command = nextpercent + 1;
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| 283 | break;
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| 284 | }
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| 285 | }
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| 286 | }
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| 287 | # endif
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| 288 | okay[opt_depth - 1] = 0;
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| 289 | }
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| 290 |
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| 291 | command = nextpercent + 1;
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| 292 | }
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| 293 | break;
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| 294 | }
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| 295 | }
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| 296 |
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| 297 | if (opt_depth > 1) {
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| 298 | errno = EUNBALBRACK;
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| 299 | free(result);
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| 300 | return NULL;
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| 301 | }
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| 302 |
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| 303 | if (!okay[0]) {
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| 304 | errno = EUNDEFVAR;
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| 305 | free(result);
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| 306 | return NULL;
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| 307 | }
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| 308 |
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| 309 | return result;
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| 310 | }
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| 311 |
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| 312 | /* execute() returns 1 for success and 0 for failure */
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| 313 | static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
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| 314 | {
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| 315 | char *out;
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| 316 | int ret;
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| 317 |
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| 318 | out = parse(command, ifd);
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| 319 | if (!out) {
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| 320 | /* parse error? */
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| 321 | return 0;
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| 322 | }
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| 323 | /* out == "": parsed ok but not all needed variables known, skip */
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| 324 | ret = out[0] ? (*exec)(out) : 1;
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| 325 |
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| 326 | free(out);
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| 327 | if (ret != 1) {
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| 328 | return 0;
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| 329 | }
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| 330 | return 1;
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| 331 | }
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| 332 |
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| 333 | #endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
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| 334 |
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| 335 |
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| 336 | #if ENABLE_FEATURE_IFUPDOWN_IPV6
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| 337 |
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| 338 | static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
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| 339 | {
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| 340 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 341 | int result;
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| 342 | result = execute("ip addr add ::1 dev %iface%", ifd, exec);
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| 343 | result += execute("ip link set %iface% up", ifd, exec);
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| 344 | return ((result == 2) ? 2 : 0);
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| 345 | # else
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| 346 | return execute("ifconfig %iface% add ::1", ifd, exec);
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| 347 | # endif
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| 348 | }
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| 349 |
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| 350 | static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
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| 351 | {
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| 352 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 353 | return execute("ip link set %iface% down", ifd, exec);
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| 354 | # else
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| 355 | return execute("ifconfig %iface% del ::1", ifd, exec);
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| 356 | # endif
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| 357 | }
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| 358 |
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| 359 | static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
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| 360 | {
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| 361 | return 1;
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| 362 | }
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| 363 |
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| 364 | static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
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| 365 | {
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| 366 | int result;
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| 367 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 368 | result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
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| 369 | result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
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| 370 | /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
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| 371 | result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
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| 372 | # else
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| 373 | result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
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| 374 | result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
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| 375 | result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
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| 376 | # endif
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| 377 | return ((result == 3) ? 3 : 0);
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| 378 | }
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| 379 |
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| 380 | static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
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| 381 | {
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| 382 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 383 | return execute("ip link set %iface% down", ifd, exec);
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| 384 | # else
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| 385 | return execute("ifconfig %iface% down", ifd, exec);
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| 386 | # endif
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| 387 | }
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| 388 |
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| 389 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 390 | static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
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| 391 | {
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| 392 | int result;
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| 393 | result = execute("ip tunnel add %iface% mode sit remote "
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| 394 | "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
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| 395 | result += execute("ip link set %iface% up", ifd, exec);
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| 396 | result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
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| 397 | result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
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| 398 | return ((result == 4) ? 4 : 0);
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| 399 | }
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| 400 |
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| 401 | static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
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| 402 | {
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| 403 | return execute("ip tunnel del %iface%", ifd, exec);
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| 404 | }
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| 405 | # endif
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| 406 |
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| 407 | static const struct method_t methods6[] = {
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| 408 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 409 | { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
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| 410 | # endif
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| 411 | { "static" , static_up6 , static_down6 , },
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| 412 | { "manual" , manual_up_down6 , manual_up_down6 , },
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| 413 | { "loopback" , loopback_up6 , loopback_down6 , },
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| 414 | };
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| 415 |
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| 416 | static const struct address_family_t addr_inet6 = {
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| 417 | "inet6",
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| 418 | ARRAY_SIZE(methods6),
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| 419 | methods6
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| 420 | };
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| 421 |
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| 422 | #endif /* FEATURE_IFUPDOWN_IPV6 */
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| 423 |
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| 424 |
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| 425 | #if ENABLE_FEATURE_IFUPDOWN_IPV4
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| 426 |
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| 427 | static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
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| 428 | {
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| 429 | # if ENABLE_FEATURE_IFUPDOWN_IP
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| 430 | int result;
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| 431 | result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
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| 432 | result += execute("ip link set %iface% up", ifd, exec);
|
---|
| 433 | return ((result == 2) ? 2 : 0);
|
---|
| 434 | # else
|
---|
| 435 | return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
|
---|
| 436 | # endif
|
---|
| 437 | }
|
---|
| 438 |
|
---|
| 439 | static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 440 | {
|
---|
| 441 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
| 442 | int result;
|
---|
| 443 | result = execute("ip addr flush dev %iface%", ifd, exec);
|
---|
| 444 | result += execute("ip link set %iface% down", ifd, exec);
|
---|
| 445 | return ((result == 2) ? 2 : 0);
|
---|
| 446 | # else
|
---|
| 447 | return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
|
---|
| 448 | # endif
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 452 | {
|
---|
| 453 | int result;
|
---|
| 454 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
| 455 | result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
|
---|
| 456 | "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
|
---|
| 457 | result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
|
---|
| 458 | result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
|
---|
| 459 | return ((result == 3) ? 3 : 0);
|
---|
| 460 | # else
|
---|
| 461 | /* ifconfig said to set iface up before it processes hw %hwaddress%,
|
---|
| 462 | * which then of course fails. Thus we run two separate ifconfig */
|
---|
| 463 | result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
|
---|
| 464 | ifd, exec);
|
---|
| 465 | result += execute("ifconfig %iface% %address% netmask %netmask%"
|
---|
| 466 | "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
|
---|
| 467 | ifd, exec);
|
---|
| 468 | result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
|
---|
| 469 | return ((result == 3) ? 3 : 0);
|
---|
| 470 | # endif
|
---|
| 471 | }
|
---|
| 472 |
|
---|
| 473 | static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 474 | {
|
---|
| 475 | int result;
|
---|
| 476 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
| 477 | result = execute("ip addr flush dev %iface%", ifd, exec);
|
---|
| 478 | result += execute("ip link set %iface% down", ifd, exec);
|
---|
| 479 | # else
|
---|
| 480 | /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
|
---|
| 481 | /* Bringing the interface down deletes the routes in itself.
|
---|
| 482 | Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
|
---|
| 483 | result = 1;
|
---|
| 484 | result += execute("ifconfig %iface% down", ifd, exec);
|
---|
| 485 | # endif
|
---|
| 486 | return ((result == 2) ? 2 : 0);
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
| 490 | struct dhcp_client_t {
|
---|
| 491 | const char *name;
|
---|
| 492 | const char *startcmd;
|
---|
| 493 | const char *stopcmd;
|
---|
| 494 | };
|
---|
| 495 |
|
---|
| 496 | static const struct dhcp_client_t ext_dhcp_clients[] = {
|
---|
| 497 | { "dhcpcd",
|
---|
| 498 | "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
|
---|
| 499 | "dhcpcd -k %iface%",
|
---|
| 500 | },
|
---|
| 501 | { "dhclient",
|
---|
| 502 | "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
|
---|
| 503 | "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
|
---|
| 504 | },
|
---|
| 505 | { "pump",
|
---|
| 506 | "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
|
---|
| 507 | "pump -i %iface% -k",
|
---|
| 508 | },
|
---|
| 509 | { "udhcpc",
|
---|
| 510 | "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %client%]]"
|
---|
| 511 | "[[ -s %script%]][[ %udhcpc_opts%]]",
|
---|
| 512 | "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
|
---|
| 513 | },
|
---|
| 514 | };
|
---|
| 515 | # endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
|
---|
| 516 |
|
---|
| 517 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
| 518 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 519 | {
|
---|
| 520 | unsigned i;
|
---|
| 521 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
| 522 | /* ip doesn't up iface when it configures it (unlike ifconfig) */
|
---|
| 523 | if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
|
---|
| 524 | return 0;
|
---|
| 525 | # else
|
---|
| 526 | /* needed if we have hwaddress on dhcp iface */
|
---|
| 527 | if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
|
---|
| 528 | return 0;
|
---|
| 529 | # endif
|
---|
| 530 | for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
|
---|
| 531 | if (exists_execable(ext_dhcp_clients[i].name))
|
---|
| 532 | return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
|
---|
| 533 | }
|
---|
| 534 | bb_error_msg("no dhcp clients found");
|
---|
| 535 | return 0;
|
---|
| 536 | }
|
---|
| 537 | # elif ENABLE_UDHCPC
|
---|
| 538 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 539 | {
|
---|
| 540 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
| 541 | /* ip doesn't up iface when it configures it (unlike ifconfig) */
|
---|
| 542 | if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
|
---|
| 543 | return 0;
|
---|
| 544 | # else
|
---|
| 545 | /* needed if we have hwaddress on dhcp iface */
|
---|
| 546 | if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
|
---|
| 547 | return 0;
|
---|
| 548 | # endif
|
---|
| 549 | return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
|
---|
| 550 | "-i %iface%[[ -H %hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
|
---|
| 551 | ifd, exec);
|
---|
| 552 | }
|
---|
| 553 | # else
|
---|
| 554 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
|
---|
| 555 | execfn *exec UNUSED_PARAM)
|
---|
| 556 | {
|
---|
| 557 | return 0; /* no dhcp support */
|
---|
| 558 | }
|
---|
| 559 | # endif
|
---|
| 560 |
|
---|
| 561 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
| 562 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 563 | {
|
---|
| 564 | int result = 0;
|
---|
| 565 | unsigned i;
|
---|
| 566 |
|
---|
| 567 | for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
|
---|
| 568 | if (exists_execable(ext_dhcp_clients[i].name)) {
|
---|
| 569 | result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
|
---|
| 570 | if (result)
|
---|
| 571 | break;
|
---|
| 572 | }
|
---|
| 573 | }
|
---|
| 574 |
|
---|
| 575 | if (!result)
|
---|
| 576 | bb_error_msg("warning: no dhcp clients found and stopped");
|
---|
| 577 |
|
---|
| 578 | /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
|
---|
| 579 | and it may come back up because udhcpc is still shutting down */
|
---|
| 580 | usleep(100000);
|
---|
| 581 | result += static_down(ifd, exec);
|
---|
| 582 | return ((result == 3) ? 3 : 0);
|
---|
| 583 | }
|
---|
| 584 | # elif ENABLE_UDHCPC
|
---|
| 585 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 586 | {
|
---|
| 587 | int result;
|
---|
| 588 | result = execute(
|
---|
| 589 | "test -f /var/run/udhcpc.%iface%.pid && "
|
---|
| 590 | "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
|
---|
| 591 | ifd, exec);
|
---|
| 592 | /* Also bring the hardware interface down since
|
---|
| 593 | killing the dhcp client alone doesn't do it.
|
---|
| 594 | This enables consecutive ifup->ifdown->ifup */
|
---|
| 595 | /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
|
---|
| 596 | and it may come back up because udhcpc is still shutting down */
|
---|
| 597 | usleep(100000);
|
---|
| 598 | result += static_down(ifd, exec);
|
---|
| 599 | return ((result == 3) ? 3 : 0);
|
---|
| 600 | }
|
---|
| 601 | # else
|
---|
| 602 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
|
---|
| 603 | execfn *exec UNUSED_PARAM)
|
---|
| 604 | {
|
---|
| 605 | return 0; /* no dhcp support */
|
---|
| 606 | }
|
---|
| 607 | # endif
|
---|
| 608 |
|
---|
| 609 | static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
|
---|
| 610 | {
|
---|
| 611 | return 1;
|
---|
| 612 | }
|
---|
| 613 |
|
---|
| 614 | static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 615 | {
|
---|
| 616 | return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
|
---|
| 617 | "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
|
---|
| 618 | " --returniffail --serverbcast", ifd, exec);
|
---|
| 619 | }
|
---|
| 620 |
|
---|
| 621 | static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 622 | {
|
---|
| 623 | return execute("pon[[ %provider%]]", ifd, exec);
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 627 | {
|
---|
| 628 | return execute("poff[[ %provider%]]", ifd, exec);
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 632 | {
|
---|
| 633 | return execute("start-stop-daemon --start -x wvdial "
|
---|
| 634 | "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
|
---|
| 635 | }
|
---|
| 636 |
|
---|
| 637 | static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
| 638 | {
|
---|
| 639 | return execute("start-stop-daemon --stop -x wvdial "
|
---|
| 640 | "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
|
---|
| 641 | }
|
---|
| 642 |
|
---|
| 643 | static const struct method_t methods[] = {
|
---|
| 644 | { "manual" , manual_up_down, manual_up_down, },
|
---|
| 645 | { "wvdial" , wvdial_up , wvdial_down , },
|
---|
| 646 | { "ppp" , ppp_up , ppp_down , },
|
---|
| 647 | { "static" , static_up , static_down , },
|
---|
| 648 | { "bootp" , bootp_up , static_down , },
|
---|
| 649 | { "dhcp" , dhcp_up , dhcp_down , },
|
---|
| 650 | { "loopback", loopback_up , loopback_down , },
|
---|
| 651 | };
|
---|
| 652 |
|
---|
| 653 | static const struct address_family_t addr_inet = {
|
---|
| 654 | "inet",
|
---|
| 655 | ARRAY_SIZE(methods),
|
---|
| 656 | methods
|
---|
| 657 | };
|
---|
| 658 |
|
---|
| 659 | #endif /* FEATURE_IFUPDOWN_IPV4 */
|
---|
| 660 |
|
---|
| 661 |
|
---|
| 662 | /* Returns pointer to the next word, or NULL.
|
---|
| 663 | * In 1st case, advances *buf to the word after this one.
|
---|
| 664 | */
|
---|
| 665 | static char *next_word(char **buf)
|
---|
| 666 | {
|
---|
| 667 | unsigned length;
|
---|
| 668 | char *word;
|
---|
| 669 |
|
---|
| 670 | /* Skip over leading whitespace */
|
---|
| 671 | word = skip_whitespace(*buf);
|
---|
| 672 |
|
---|
| 673 | /* Stop on EOL */
|
---|
| 674 | if (*word == '\0')
|
---|
| 675 | return NULL;
|
---|
| 676 |
|
---|
| 677 | /* Find the length of this word (can't be 0) */
|
---|
| 678 | length = strcspn(word, " \t\n");
|
---|
| 679 |
|
---|
| 680 | /* Unless we are already at NUL, store NUL and advance */
|
---|
| 681 | if (word[length] != '\0')
|
---|
| 682 | word[length++] = '\0';
|
---|
| 683 |
|
---|
| 684 | *buf = skip_whitespace(word + length);
|
---|
| 685 |
|
---|
| 686 | return word;
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 | static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
|
---|
| 690 | {
|
---|
| 691 | int i;
|
---|
| 692 |
|
---|
| 693 | if (!name)
|
---|
| 694 | return NULL;
|
---|
| 695 |
|
---|
| 696 | for (i = 0; af[i]; i++) {
|
---|
| 697 | if (strcmp(af[i]->name, name) == 0) {
|
---|
| 698 | return af[i];
|
---|
| 699 | }
|
---|
| 700 | }
|
---|
| 701 | return NULL;
|
---|
| 702 | }
|
---|
| 703 |
|
---|
| 704 | static const struct method_t *get_method(const struct address_family_t *af, char *name)
|
---|
| 705 | {
|
---|
| 706 | int i;
|
---|
| 707 |
|
---|
| 708 | if (!name)
|
---|
| 709 | return NULL;
|
---|
| 710 | /* TODO: use index_in_str_array() */
|
---|
| 711 | for (i = 0; i < af->n_methods; i++) {
|
---|
| 712 | if (strcmp(af->method[i].name, name) == 0) {
|
---|
| 713 | return &af->method[i];
|
---|
| 714 | }
|
---|
| 715 | }
|
---|
| 716 | return NULL;
|
---|
| 717 | }
|
---|
| 718 |
|
---|
| 719 | static struct interfaces_file_t *read_interfaces(const char *filename)
|
---|
| 720 | {
|
---|
| 721 | /* Let's try to be compatible.
|
---|
| 722 | *
|
---|
| 723 | * "man 5 interfaces" says:
|
---|
| 724 | * Lines starting with "#" are ignored. Note that end-of-line
|
---|
| 725 | * comments are NOT supported, comments must be on a line of their own.
|
---|
| 726 | * A line may be extended across multiple lines by making
|
---|
| 727 | * the last character a backslash.
|
---|
| 728 | *
|
---|
| 729 | * Seen elsewhere in example config file:
|
---|
| 730 | * A first non-blank "#" character makes the rest of the line
|
---|
| 731 | * be ignored. Blank lines are ignored. Lines may be indented freely.
|
---|
| 732 | * A "\" character at the very end of the line indicates the next line
|
---|
| 733 | * should be treated as a continuation of the current one.
|
---|
| 734 | */
|
---|
| 735 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
| 736 | struct mapping_defn_t *currmap = NULL;
|
---|
| 737 | #endif
|
---|
| 738 | struct interface_defn_t *currif = NULL;
|
---|
| 739 | struct interfaces_file_t *defn;
|
---|
| 740 | FILE *f;
|
---|
| 741 | char *buf;
|
---|
| 742 | char *first_word;
|
---|
| 743 | char *rest_of_line;
|
---|
| 744 | enum { NONE, IFACE, MAPPING } currently_processing = NONE;
|
---|
| 745 |
|
---|
| 746 | defn = xzalloc(sizeof(*defn));
|
---|
| 747 | f = xfopen_for_read(filename);
|
---|
| 748 |
|
---|
| 749 | while ((buf = xmalloc_fgetline(f)) != NULL) {
|
---|
| 750 | #if ENABLE_DESKTOP
|
---|
| 751 | /* Trailing "\" concatenates lines */
|
---|
| 752 | char *p;
|
---|
| 753 | while ((p = last_char_is(buf, '\\')) != NULL) {
|
---|
| 754 | *p = '\0';
|
---|
| 755 | rest_of_line = xmalloc_fgetline(f);
|
---|
| 756 | if (!rest_of_line)
|
---|
| 757 | break;
|
---|
| 758 | p = xasprintf("%s%s", buf, rest_of_line);
|
---|
| 759 | free(buf);
|
---|
| 760 | free(rest_of_line);
|
---|
| 761 | buf = p;
|
---|
| 762 | }
|
---|
| 763 | #endif
|
---|
| 764 | rest_of_line = buf;
|
---|
| 765 | first_word = next_word(&rest_of_line);
|
---|
| 766 | if (!first_word || *first_word == '#') {
|
---|
| 767 | free(buf);
|
---|
| 768 | continue; /* blank/comment line */
|
---|
| 769 | }
|
---|
| 770 |
|
---|
| 771 | if (strcmp(first_word, "mapping") == 0) {
|
---|
| 772 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
| 773 | currmap = xzalloc(sizeof(*currmap));
|
---|
| 774 |
|
---|
| 775 | while ((first_word = next_word(&rest_of_line)) != NULL) {
|
---|
| 776 | currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
|
---|
| 777 | currmap->match[currmap->n_matches++] = xstrdup(first_word);
|
---|
| 778 | }
|
---|
| 779 | /*currmap->max_mappings = 0; - done by xzalloc */
|
---|
| 780 | /*currmap->n_mappings = 0;*/
|
---|
| 781 | /*currmap->mapping = NULL;*/
|
---|
| 782 | /*currmap->script = NULL;*/
|
---|
| 783 | {
|
---|
| 784 | struct mapping_defn_t **where = &defn->mappings;
|
---|
| 785 | while (*where != NULL) {
|
---|
| 786 | where = &(*where)->next;
|
---|
| 787 | }
|
---|
| 788 | *where = currmap;
|
---|
| 789 | /*currmap->next = NULL;*/
|
---|
| 790 | }
|
---|
| 791 | debug_noise("Added mapping\n");
|
---|
| 792 | #endif
|
---|
| 793 | currently_processing = MAPPING;
|
---|
| 794 | } else if (strcmp(first_word, "iface") == 0) {
|
---|
| 795 | static const struct address_family_t *const addr_fams[] = {
|
---|
| 796 | #if ENABLE_FEATURE_IFUPDOWN_IPV4
|
---|
| 797 | &addr_inet,
|
---|
| 798 | #endif
|
---|
| 799 | #if ENABLE_FEATURE_IFUPDOWN_IPV6
|
---|
| 800 | &addr_inet6,
|
---|
| 801 | #endif
|
---|
| 802 | NULL
|
---|
| 803 | };
|
---|
| 804 | char *iface_name;
|
---|
| 805 | char *address_family_name;
|
---|
| 806 | char *method_name;
|
---|
| 807 | llist_t *iface_list;
|
---|
| 808 |
|
---|
| 809 | currif = xzalloc(sizeof(*currif));
|
---|
| 810 | iface_name = next_word(&rest_of_line);
|
---|
| 811 | address_family_name = next_word(&rest_of_line);
|
---|
| 812 | method_name = next_word(&rest_of_line);
|
---|
| 813 |
|
---|
| 814 | if (method_name == NULL)
|
---|
| 815 | bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
|
---|
| 816 |
|
---|
| 817 | /* ship any trailing whitespace */
|
---|
| 818 | rest_of_line = skip_whitespace(rest_of_line);
|
---|
| 819 |
|
---|
| 820 | if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
|
---|
| 821 | bb_error_msg_and_die("too many parameters \"%s\"", buf);
|
---|
| 822 |
|
---|
| 823 | currif->iface = xstrdup(iface_name);
|
---|
| 824 |
|
---|
| 825 | currif->address_family = get_address_family(addr_fams, address_family_name);
|
---|
| 826 | if (!currif->address_family)
|
---|
| 827 | bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
|
---|
| 828 |
|
---|
| 829 | currif->method = get_method(currif->address_family, method_name);
|
---|
| 830 | if (!currif->method)
|
---|
| 831 | bb_error_msg_and_die("unknown method \"%s\"", method_name);
|
---|
| 832 |
|
---|
| 833 | for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
|
---|
| 834 | struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
|
---|
| 835 | if ((strcmp(tmp->iface, currif->iface) == 0)
|
---|
| 836 | && (tmp->address_family == currif->address_family)
|
---|
| 837 | ) {
|
---|
| 838 | bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
|
---|
| 839 | }
|
---|
| 840 | }
|
---|
| 841 | llist_add_to_end(&(defn->ifaces), (char*)currif);
|
---|
| 842 |
|
---|
| 843 | debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
|
---|
| 844 | currently_processing = IFACE;
|
---|
| 845 | } else if (strcmp(first_word, "auto") == 0) {
|
---|
| 846 | while ((first_word = next_word(&rest_of_line)) != NULL) {
|
---|
| 847 |
|
---|
| 848 | /* Check the interface isnt already listed */
|
---|
| 849 | if (llist_find_str(defn->autointerfaces, first_word)) {
|
---|
| 850 | bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
|
---|
| 851 | }
|
---|
| 852 |
|
---|
| 853 | /* Add the interface to the list */
|
---|
| 854 | llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
|
---|
| 855 | debug_noise("\nauto %s\n", first_word);
|
---|
| 856 | }
|
---|
| 857 | currently_processing = NONE;
|
---|
| 858 | } else {
|
---|
| 859 | switch (currently_processing) {
|
---|
| 860 | case IFACE:
|
---|
| 861 | if (rest_of_line[0] == '\0')
|
---|
| 862 | bb_error_msg_and_die("option with empty value \"%s\"", buf);
|
---|
| 863 |
|
---|
| 864 | if (strcmp(first_word, "up") != 0
|
---|
| 865 | && strcmp(first_word, "down") != 0
|
---|
| 866 | && strcmp(first_word, "pre-up") != 0
|
---|
| 867 | && strcmp(first_word, "post-down") != 0
|
---|
| 868 | ) {
|
---|
| 869 | int i;
|
---|
| 870 | for (i = 0; i < currif->n_options; i++) {
|
---|
| 871 | if (strcmp(currif->option[i].name, first_word) == 0)
|
---|
| 872 | bb_error_msg_and_die("duplicate option \"%s\"", buf);
|
---|
| 873 | }
|
---|
| 874 | }
|
---|
| 875 | if (currif->n_options >= currif->max_options) {
|
---|
| 876 | currif->max_options += 10;
|
---|
| 877 | currif->option = xrealloc(currif->option,
|
---|
| 878 | sizeof(*currif->option) * currif->max_options);
|
---|
| 879 | }
|
---|
| 880 | debug_noise("\t%s=%s\n", first_word, rest_of_line);
|
---|
| 881 | currif->option[currif->n_options].name = xstrdup(first_word);
|
---|
| 882 | currif->option[currif->n_options].value = xstrdup(rest_of_line);
|
---|
| 883 | currif->n_options++;
|
---|
| 884 | break;
|
---|
| 885 | case MAPPING:
|
---|
| 886 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
| 887 | if (strcmp(first_word, "script") == 0) {
|
---|
| 888 | if (currmap->script != NULL)
|
---|
| 889 | bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
|
---|
| 890 | currmap->script = xstrdup(next_word(&rest_of_line));
|
---|
| 891 | } else if (strcmp(first_word, "map") == 0) {
|
---|
| 892 | if (currmap->n_mappings >= currmap->max_mappings) {
|
---|
| 893 | currmap->max_mappings = currmap->max_mappings * 2 + 1;
|
---|
| 894 | currmap->mapping = xrealloc(currmap->mapping,
|
---|
| 895 | sizeof(char *) * currmap->max_mappings);
|
---|
| 896 | }
|
---|
| 897 | currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
|
---|
| 898 | currmap->n_mappings++;
|
---|
| 899 | } else {
|
---|
| 900 | bb_error_msg_and_die("misplaced option \"%s\"", buf);
|
---|
| 901 | }
|
---|
| 902 | #endif
|
---|
| 903 | break;
|
---|
| 904 | case NONE:
|
---|
| 905 | default:
|
---|
| 906 | bb_error_msg_and_die("misplaced option \"%s\"", buf);
|
---|
| 907 | }
|
---|
| 908 | }
|
---|
| 909 | free(buf);
|
---|
| 910 | } /* while (fgets) */
|
---|
| 911 |
|
---|
| 912 | if (ferror(f) != 0) {
|
---|
| 913 | /* ferror does NOT set errno! */
|
---|
| 914 | bb_error_msg_and_die("%s: I/O error", filename);
|
---|
| 915 | }
|
---|
| 916 | fclose(f);
|
---|
| 917 |
|
---|
| 918 | return defn;
|
---|
| 919 | }
|
---|
| 920 |
|
---|
| 921 | static char *setlocalenv(const char *format, const char *name, const char *value)
|
---|
| 922 | {
|
---|
| 923 | char *result;
|
---|
| 924 | char *dst;
|
---|
| 925 | char *src;
|
---|
| 926 | char c;
|
---|
| 927 |
|
---|
| 928 | result = xasprintf(format, name, value);
|
---|
| 929 |
|
---|
| 930 | for (dst = src = result; (c = *src) != '=' && c; src++) {
|
---|
| 931 | if (c == '-')
|
---|
| 932 | c = '_';
|
---|
| 933 | if (c >= 'a' && c <= 'z')
|
---|
| 934 | c -= ('a' - 'A');
|
---|
| 935 | if (isalnum(c) || c == '_')
|
---|
| 936 | *dst++ = c;
|
---|
| 937 | }
|
---|
| 938 | overlapping_strcpy(dst, src);
|
---|
| 939 |
|
---|
| 940 | return result;
|
---|
| 941 | }
|
---|
| 942 |
|
---|
| 943 | static void set_environ(struct interface_defn_t *iface, const char *mode)
|
---|
| 944 | {
|
---|
| 945 | int i;
|
---|
| 946 | char **pp;
|
---|
| 947 |
|
---|
| 948 | if (G.my_environ != NULL) {
|
---|
| 949 | for (pp = G.my_environ; *pp; pp++) {
|
---|
| 950 | free(*pp);
|
---|
| 951 | }
|
---|
| 952 | free(G.my_environ);
|
---|
| 953 | }
|
---|
| 954 |
|
---|
| 955 | /* note: last element will stay NULL: */
|
---|
| 956 | G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 6));
|
---|
| 957 | pp = G.my_environ;
|
---|
| 958 |
|
---|
| 959 | for (i = 0; i < iface->n_options; i++) {
|
---|
| 960 | if (strcmp(iface->option[i].name, "up") == 0
|
---|
| 961 | || strcmp(iface->option[i].name, "down") == 0
|
---|
| 962 | || strcmp(iface->option[i].name, "pre-up") == 0
|
---|
| 963 | || strcmp(iface->option[i].name, "post-down") == 0
|
---|
| 964 | ) {
|
---|
| 965 | continue;
|
---|
| 966 | }
|
---|
| 967 | *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
|
---|
| 968 | }
|
---|
| 969 |
|
---|
| 970 | *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
|
---|
| 971 | *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
|
---|
| 972 | *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
|
---|
| 973 | *pp++ = setlocalenv("%s=%s", "MODE", mode);
|
---|
| 974 | if (G.startup_PATH)
|
---|
| 975 | *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
|
---|
| 976 | }
|
---|
| 977 |
|
---|
| 978 | static int doit(char *str)
|
---|
| 979 | {
|
---|
| 980 | if (option_mask32 & (OPT_no_act|OPT_verbose)) {
|
---|
| 981 | puts(str);
|
---|
| 982 | }
|
---|
| 983 | if (!(option_mask32 & OPT_no_act)) {
|
---|
| 984 | pid_t child;
|
---|
| 985 | int status;
|
---|
| 986 |
|
---|
| 987 | fflush_all();
|
---|
| 988 | child = vfork();
|
---|
| 989 | switch (child) {
|
---|
| 990 | case -1: /* failure */
|
---|
| 991 | return 0;
|
---|
| 992 | case 0: /* child */
|
---|
| 993 | execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, (char *) NULL, G.my_environ);
|
---|
| 994 | _exit(127);
|
---|
| 995 | }
|
---|
| 996 | safe_waitpid(child, &status, 0);
|
---|
| 997 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
---|
| 998 | return 0;
|
---|
| 999 | }
|
---|
| 1000 | }
|
---|
| 1001 | return 1;
|
---|
| 1002 | }
|
---|
| 1003 |
|
---|
| 1004 | static int execute_all(struct interface_defn_t *ifd, const char *opt)
|
---|
| 1005 | {
|
---|
| 1006 | int i;
|
---|
| 1007 | char *buf;
|
---|
| 1008 | for (i = 0; i < ifd->n_options; i++) {
|
---|
| 1009 | if (strcmp(ifd->option[i].name, opt) == 0) {
|
---|
| 1010 | if (!doit(ifd->option[i].value)) {
|
---|
| 1011 | return 0;
|
---|
| 1012 | }
|
---|
| 1013 | }
|
---|
| 1014 | }
|
---|
| 1015 |
|
---|
| 1016 | buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
|
---|
| 1017 | /* heh, we don't bother free'ing it */
|
---|
| 1018 | return doit(buf);
|
---|
| 1019 | }
|
---|
| 1020 |
|
---|
| 1021 | static int check(char *str)
|
---|
| 1022 | {
|
---|
| 1023 | return str != NULL;
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 | static int iface_up(struct interface_defn_t *iface)
|
---|
| 1027 | {
|
---|
| 1028 | if (!iface->method->up(iface, check)) return -1;
|
---|
| 1029 | set_environ(iface, "start");
|
---|
| 1030 | if (!execute_all(iface, "pre-up")) return 0;
|
---|
| 1031 | if (!iface->method->up(iface, doit)) return 0;
|
---|
| 1032 | if (!execute_all(iface, "up")) return 0;
|
---|
| 1033 | return 1;
|
---|
| 1034 | }
|
---|
| 1035 |
|
---|
| 1036 | static int iface_down(struct interface_defn_t *iface)
|
---|
| 1037 | {
|
---|
| 1038 | if (!iface->method->down(iface,check)) return -1;
|
---|
| 1039 | set_environ(iface, "stop");
|
---|
| 1040 | if (!execute_all(iface, "down")) return 0;
|
---|
| 1041 | if (!iface->method->down(iface, doit)) return 0;
|
---|
| 1042 | if (!execute_all(iface, "post-down")) return 0;
|
---|
| 1043 | return 1;
|
---|
| 1044 | }
|
---|
| 1045 |
|
---|
| 1046 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
| 1047 | static int popen2(FILE **in, FILE **out, char *command, char *param)
|
---|
| 1048 | {
|
---|
| 1049 | char *argv[3] = { command, param, NULL };
|
---|
| 1050 | struct fd_pair infd, outfd;
|
---|
| 1051 | pid_t pid;
|
---|
| 1052 |
|
---|
| 1053 | xpiped_pair(infd);
|
---|
| 1054 | xpiped_pair(outfd);
|
---|
| 1055 |
|
---|
| 1056 | fflush_all();
|
---|
| 1057 | pid = xvfork();
|
---|
| 1058 |
|
---|
| 1059 | if (pid == 0) {
|
---|
| 1060 | /* Child */
|
---|
| 1061 | /* NB: close _first_, then move fds! */
|
---|
| 1062 | close(infd.wr);
|
---|
| 1063 | close(outfd.rd);
|
---|
| 1064 | xmove_fd(infd.rd, 0);
|
---|
| 1065 | xmove_fd(outfd.wr, 1);
|
---|
| 1066 | BB_EXECVP_or_die(argv);
|
---|
| 1067 | }
|
---|
| 1068 | /* parent */
|
---|
| 1069 | close(infd.rd);
|
---|
| 1070 | close(outfd.wr);
|
---|
| 1071 | *in = xfdopen_for_write(infd.wr);
|
---|
| 1072 | *out = xfdopen_for_read(outfd.rd);
|
---|
| 1073 | return pid;
|
---|
| 1074 | }
|
---|
| 1075 |
|
---|
| 1076 | static char *run_mapping(char *physical, struct mapping_defn_t *map)
|
---|
| 1077 | {
|
---|
| 1078 | FILE *in, *out;
|
---|
| 1079 | int i, status;
|
---|
| 1080 | pid_t pid;
|
---|
| 1081 |
|
---|
| 1082 | char *logical = xstrdup(physical);
|
---|
| 1083 |
|
---|
| 1084 | /* Run the mapping script. Never fails. */
|
---|
| 1085 | pid = popen2(&in, &out, map->script, physical);
|
---|
| 1086 |
|
---|
| 1087 | /* Write mappings to stdin of mapping script. */
|
---|
| 1088 | for (i = 0; i < map->n_mappings; i++) {
|
---|
| 1089 | fprintf(in, "%s\n", map->mapping[i]);
|
---|
| 1090 | }
|
---|
| 1091 | fclose(in);
|
---|
| 1092 | safe_waitpid(pid, &status, 0);
|
---|
| 1093 |
|
---|
| 1094 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
---|
| 1095 | /* If the mapping script exited successfully, try to
|
---|
| 1096 | * grab a line of output and use that as the name of the
|
---|
| 1097 | * logical interface. */
|
---|
| 1098 | char *new_logical = xmalloc_fgetline(out);
|
---|
| 1099 |
|
---|
| 1100 | if (new_logical) {
|
---|
| 1101 | /* If we are able to read a line of output from the script,
|
---|
| 1102 | * remove any trailing whitespace and use this value
|
---|
| 1103 | * as the name of the logical interface. */
|
---|
| 1104 | char *pch = new_logical + strlen(new_logical) - 1;
|
---|
| 1105 |
|
---|
| 1106 | while (pch >= new_logical && isspace(*pch))
|
---|
| 1107 | *(pch--) = '\0';
|
---|
| 1108 |
|
---|
| 1109 | free(logical);
|
---|
| 1110 | logical = new_logical;
|
---|
| 1111 | }
|
---|
| 1112 | }
|
---|
| 1113 |
|
---|
| 1114 | fclose(out);
|
---|
| 1115 |
|
---|
| 1116 | return logical;
|
---|
| 1117 | }
|
---|
| 1118 | #endif /* FEATURE_IFUPDOWN_MAPPING */
|
---|
| 1119 |
|
---|
| 1120 | static llist_t *find_iface_state(llist_t *state_list, const char *iface)
|
---|
| 1121 | {
|
---|
| 1122 | unsigned iface_len = strlen(iface);
|
---|
| 1123 | llist_t *search = state_list;
|
---|
| 1124 |
|
---|
| 1125 | while (search) {
|
---|
| 1126 | if ((strncmp(search->data, iface, iface_len) == 0)
|
---|
| 1127 | && (search->data[iface_len] == '=')
|
---|
| 1128 | ) {
|
---|
| 1129 | return search;
|
---|
| 1130 | }
|
---|
| 1131 | search = search->link;
|
---|
| 1132 | }
|
---|
| 1133 | return NULL;
|
---|
| 1134 | }
|
---|
| 1135 |
|
---|
| 1136 | /* read the previous state from the state file */
|
---|
| 1137 | static llist_t *read_iface_state(void)
|
---|
| 1138 | {
|
---|
| 1139 | llist_t *state_list = NULL;
|
---|
| 1140 | FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
|
---|
| 1141 |
|
---|
| 1142 | if (state_fp) {
|
---|
| 1143 | char *start, *end_ptr;
|
---|
| 1144 | while ((start = xmalloc_fgets(state_fp)) != NULL) {
|
---|
| 1145 | /* We should only need to check for a single character */
|
---|
| 1146 | end_ptr = start + strcspn(start, " \t\n");
|
---|
| 1147 | *end_ptr = '\0';
|
---|
| 1148 | llist_add_to(&state_list, start);
|
---|
| 1149 | }
|
---|
| 1150 | fclose(state_fp);
|
---|
| 1151 | }
|
---|
| 1152 | return state_list;
|
---|
| 1153 | }
|
---|
| 1154 |
|
---|
| 1155 |
|
---|
| 1156 | int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1157 | int ifupdown_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 1158 | {
|
---|
| 1159 | int (*cmds)(struct interface_defn_t *);
|
---|
| 1160 | struct interfaces_file_t *defn;
|
---|
| 1161 | llist_t *target_list = NULL;
|
---|
| 1162 | const char *interfaces = "/etc/network/interfaces";
|
---|
| 1163 | bool any_failures = 0;
|
---|
| 1164 |
|
---|
| 1165 | INIT_G();
|
---|
| 1166 |
|
---|
| 1167 | G.startup_PATH = getenv("PATH");
|
---|
| 1168 |
|
---|
| 1169 | cmds = iface_down;
|
---|
| 1170 | if (applet_name[2] == 'u') {
|
---|
| 1171 | /* ifup command */
|
---|
| 1172 | cmds = iface_up;
|
---|
| 1173 | }
|
---|
| 1174 |
|
---|
| 1175 | getopt32(argv, OPTION_STR, &interfaces);
|
---|
| 1176 | argv += optind;
|
---|
| 1177 | if (argv[0]) {
|
---|
| 1178 | if (DO_ALL) bb_show_usage();
|
---|
| 1179 | } else {
|
---|
| 1180 | if (!DO_ALL) bb_show_usage();
|
---|
| 1181 | }
|
---|
| 1182 |
|
---|
| 1183 | debug_noise("reading %s file:\n", interfaces);
|
---|
| 1184 | defn = read_interfaces(interfaces);
|
---|
| 1185 | debug_noise("\ndone reading %s\n\n", interfaces);
|
---|
| 1186 |
|
---|
| 1187 | /* Create a list of interfaces to work on */
|
---|
| 1188 | if (DO_ALL) {
|
---|
| 1189 | target_list = defn->autointerfaces;
|
---|
| 1190 | } else {
|
---|
| 1191 | llist_add_to_end(&target_list, argv[0]);
|
---|
| 1192 | }
|
---|
| 1193 |
|
---|
| 1194 | /* Update the interfaces */
|
---|
| 1195 | while (target_list) {
|
---|
| 1196 | llist_t *iface_list;
|
---|
| 1197 | struct interface_defn_t *currif;
|
---|
| 1198 | char *iface;
|
---|
| 1199 | char *liface;
|
---|
| 1200 | char *pch;
|
---|
| 1201 | bool okay = 0;
|
---|
| 1202 | int cmds_ret;
|
---|
| 1203 |
|
---|
| 1204 | iface = xstrdup(target_list->data);
|
---|
| 1205 | target_list = target_list->link;
|
---|
| 1206 |
|
---|
| 1207 | pch = strchr(iface, '=');
|
---|
| 1208 | if (pch) {
|
---|
| 1209 | *pch = '\0';
|
---|
| 1210 | liface = xstrdup(pch + 1);
|
---|
| 1211 | } else {
|
---|
| 1212 | liface = xstrdup(iface);
|
---|
| 1213 | }
|
---|
| 1214 |
|
---|
| 1215 | if (!FORCE) {
|
---|
| 1216 | llist_t *state_list = read_iface_state();
|
---|
| 1217 | const llist_t *iface_state = find_iface_state(state_list, iface);
|
---|
| 1218 |
|
---|
| 1219 | if (cmds == iface_up) {
|
---|
| 1220 | /* ifup */
|
---|
| 1221 | if (iface_state) {
|
---|
| 1222 | bb_error_msg("interface %s already configured", iface);
|
---|
| 1223 | continue;
|
---|
| 1224 | }
|
---|
| 1225 | } else {
|
---|
| 1226 | /* ifdown */
|
---|
| 1227 | if (!iface_state) {
|
---|
| 1228 | bb_error_msg("interface %s not configured", iface);
|
---|
| 1229 | continue;
|
---|
| 1230 | }
|
---|
| 1231 | }
|
---|
| 1232 | llist_free(state_list, free);
|
---|
| 1233 | }
|
---|
| 1234 |
|
---|
| 1235 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
| 1236 | if ((cmds == iface_up) && !NO_MAPPINGS) {
|
---|
| 1237 | struct mapping_defn_t *currmap;
|
---|
| 1238 |
|
---|
| 1239 | for (currmap = defn->mappings; currmap; currmap = currmap->next) {
|
---|
| 1240 | int i;
|
---|
| 1241 | for (i = 0; i < currmap->n_matches; i++) {
|
---|
| 1242 | if (fnmatch(currmap->match[i], liface, 0) != 0)
|
---|
| 1243 | continue;
|
---|
| 1244 | if (VERBOSE) {
|
---|
| 1245 | printf("Running mapping script %s on %s\n", currmap->script, liface);
|
---|
| 1246 | }
|
---|
| 1247 | liface = run_mapping(iface, currmap);
|
---|
| 1248 | break;
|
---|
| 1249 | }
|
---|
| 1250 | }
|
---|
| 1251 | }
|
---|
| 1252 | #endif
|
---|
| 1253 |
|
---|
| 1254 | iface_list = defn->ifaces;
|
---|
| 1255 | while (iface_list) {
|
---|
| 1256 | currif = (struct interface_defn_t *) iface_list->data;
|
---|
| 1257 | if (strcmp(liface, currif->iface) == 0) {
|
---|
| 1258 | char *oldiface = currif->iface;
|
---|
| 1259 |
|
---|
| 1260 | okay = 1;
|
---|
| 1261 | currif->iface = iface;
|
---|
| 1262 |
|
---|
| 1263 | debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
|
---|
| 1264 |
|
---|
| 1265 | /* Call the cmds function pointer, does either iface_up() or iface_down() */
|
---|
| 1266 | cmds_ret = cmds(currif);
|
---|
| 1267 | if (cmds_ret == -1) {
|
---|
| 1268 | bb_error_msg("don't seem to have all the variables for %s/%s",
|
---|
| 1269 | liface, currif->address_family->name);
|
---|
| 1270 | any_failures = 1;
|
---|
| 1271 | } else if (cmds_ret == 0) {
|
---|
| 1272 | any_failures = 1;
|
---|
| 1273 | }
|
---|
| 1274 |
|
---|
| 1275 | currif->iface = oldiface;
|
---|
| 1276 | }
|
---|
| 1277 | iface_list = iface_list->link;
|
---|
| 1278 | }
|
---|
| 1279 | if (VERBOSE) {
|
---|
| 1280 | bb_putchar('\n');
|
---|
| 1281 | }
|
---|
| 1282 |
|
---|
| 1283 | if (!okay && !FORCE) {
|
---|
| 1284 | bb_error_msg("ignoring unknown interface %s", liface);
|
---|
| 1285 | any_failures = 1;
|
---|
| 1286 | } else if (!NO_ACT) {
|
---|
| 1287 | /* update the state file */
|
---|
| 1288 | FILE *state_fp;
|
---|
| 1289 | llist_t *state;
|
---|
| 1290 | llist_t *state_list = read_iface_state();
|
---|
| 1291 | llist_t *iface_state = find_iface_state(state_list, iface);
|
---|
| 1292 |
|
---|
| 1293 | if (cmds == iface_up) {
|
---|
| 1294 | char * const newiface = xasprintf("%s=%s", iface, liface);
|
---|
| 1295 | if (iface_state == NULL) {
|
---|
| 1296 | llist_add_to_end(&state_list, newiface);
|
---|
| 1297 | } else {
|
---|
| 1298 | free(iface_state->data);
|
---|
| 1299 | iface_state->data = newiface;
|
---|
| 1300 | }
|
---|
| 1301 | } else {
|
---|
| 1302 | /* Remove an interface from state_list */
|
---|
| 1303 | llist_unlink(&state_list, iface_state);
|
---|
| 1304 | free(llist_pop(&iface_state));
|
---|
| 1305 | }
|
---|
| 1306 |
|
---|
| 1307 | /* Actually write the new state */
|
---|
| 1308 | state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
|
---|
| 1309 | state = state_list;
|
---|
| 1310 | while (state) {
|
---|
| 1311 | if (state->data) {
|
---|
| 1312 | fprintf(state_fp, "%s\n", state->data);
|
---|
| 1313 | }
|
---|
| 1314 | state = state->link;
|
---|
| 1315 | }
|
---|
| 1316 | fclose(state_fp);
|
---|
| 1317 | llist_free(state_list, free);
|
---|
| 1318 | }
|
---|
| 1319 | }
|
---|
| 1320 |
|
---|
| 1321 | return any_failures;
|
---|
| 1322 | }
|
---|