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 | //usage:#define ifup_trivial_usage
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21 | //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
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22 | //usage:#define ifup_full_usage "\n\n"
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23 | //usage: " -a De/configure all interfaces automatically"
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24 | //usage: "\n -i FILE Use FILE for interface definitions"
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25 | //usage: "\n -n Print out what would happen, but don't do it"
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26 | //usage: IF_FEATURE_IFUPDOWN_MAPPING(
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27 | //usage: "\n (note: doesn't disable mappings)"
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28 | //usage: "\n -m Don't run any mappings"
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29 | //usage: )
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30 | //usage: "\n -v Print out what would happen before doing it"
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31 | //usage: "\n -f Force de/configuration"
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32 | //usage:
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33 | //usage:#define ifdown_trivial_usage
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34 | //usage: "[-an"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] [-i FILE] IFACE..."
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35 | //usage:#define ifdown_full_usage "\n\n"
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36 | //usage: " -a De/configure all interfaces automatically"
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37 | //usage: "\n -i FILE Use FILE for interface definitions"
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38 | //usage: "\n -n Print out what would happen, but don't do it"
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39 | //usage: IF_FEATURE_IFUPDOWN_MAPPING(
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40 | //usage: "\n (note: doesn't disable mappings)"
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41 | //usage: "\n -m Don't run any mappings"
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42 | //usage: )
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43 | //usage: "\n -v Print out what would happen before doing it"
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44 | //usage: "\n -f Force de/configuration"
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45 |
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46 | #include "libbb.h"
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47 | /* After libbb.h, since it needs sys/types.h on some systems */
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48 | #include <sys/utsname.h>
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49 | #include <fnmatch.h>
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50 |
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51 | #define MAX_OPT_DEPTH 10
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52 |
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53 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
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54 | #define MAX_INTERFACE_LENGTH 10
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55 | #endif
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56 |
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57 | #define UDHCPC_CMD_OPTIONS CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS
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58 |
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59 | #define debug_noise(args...) /*fprintf(stderr, args)*/
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60 |
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61 | /* Forward declaration */
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62 | struct interface_defn_t;
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63 |
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64 | typedef int execfn(char *command);
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65 |
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66 | struct method_t {
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67 | const char *name;
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68 | int (*up)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
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69 | int (*down)(struct interface_defn_t *ifd, execfn *e) FAST_FUNC;
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70 | };
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71 |
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72 | struct address_family_t {
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73 | const char *name;
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74 | int n_methods;
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75 | const struct method_t *method;
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76 | };
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77 |
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78 | struct mapping_defn_t {
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79 | struct mapping_defn_t *next;
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80 |
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81 | int max_matches;
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82 | int n_matches;
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83 | char **match;
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84 |
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85 | char *script;
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86 |
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87 | int n_mappings;
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88 | char **mapping;
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89 | };
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90 |
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91 | struct variable_t {
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92 | char *name;
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93 | char *value;
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94 | };
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95 |
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96 | struct interface_defn_t {
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97 | const struct address_family_t *address_family;
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98 | const struct method_t *method;
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99 |
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100 | char *iface;
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101 | int n_options;
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102 | struct variable_t *option;
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103 | };
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104 |
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105 | struct interfaces_file_t {
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106 | llist_t *autointerfaces;
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107 | llist_t *ifaces;
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108 | struct mapping_defn_t *mappings;
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109 | };
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110 |
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111 |
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112 | #define OPTION_STR "anvf" IF_FEATURE_IFUPDOWN_MAPPING("m") "i:"
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113 | enum {
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114 | OPT_do_all = 0x1,
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115 | OPT_no_act = 0x2,
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116 | OPT_verbose = 0x4,
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117 | OPT_force = 0x8,
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118 | OPT_no_mappings = 0x10,
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119 | };
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120 | #define DO_ALL (option_mask32 & OPT_do_all)
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121 | #define NO_ACT (option_mask32 & OPT_no_act)
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122 | #define VERBOSE (option_mask32 & OPT_verbose)
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123 | #define FORCE (option_mask32 & OPT_force)
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124 | #define NO_MAPPINGS (option_mask32 & OPT_no_mappings)
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125 |
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126 |
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127 | struct globals {
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128 | char **my_environ;
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129 | const char *startup_PATH;
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130 | char *shell;
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131 | } FIX_ALIASING;
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132 | #define G (*(struct globals*)&bb_common_bufsiz1)
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133 | #define INIT_G() do { } while (0)
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134 |
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135 |
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136 | static const char keywords_up_down[] ALIGN1 =
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137 | "up\0"
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138 | "down\0"
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139 | "pre-up\0"
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140 | "post-down\0"
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141 | ;
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142 |
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143 |
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144 | #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
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145 |
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146 | static void addstr(char **bufp, const char *str, size_t str_length)
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147 | {
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148 | /* xasprintf trick will be smaller, but we are often
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149 | * called with str_length == 1 - don't want to have
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150 | * THAT much of malloc/freeing! */
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151 | char *buf = *bufp;
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152 | int len = (buf ? strlen(buf) : 0);
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153 | str_length++;
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154 | buf = xrealloc(buf, len + str_length);
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155 | /* copies at most str_length-1 chars! */
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156 | safe_strncpy(buf + len, str, str_length);
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157 | *bufp = buf;
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158 | }
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159 |
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160 | static int strncmpz(const char *l, const char *r, size_t llen)
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161 | {
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162 | int i = strncmp(l, r, llen);
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163 |
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164 | if (i == 0)
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165 | return - (unsigned char)r[llen];
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166 | return i;
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167 | }
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168 |
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169 | static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
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170 | {
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171 | int i;
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172 |
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173 | if (strncmpz(id, "iface", idlen) == 0) {
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174 | // ubuntu's ifup doesn't do this:
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175 | //static char *label_buf;
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176 | //char *result;
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177 | //free(label_buf);
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178 | //label_buf = xstrdup(ifd->iface);
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179 | // Remove virtual iface suffix
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180 | //result = strchrnul(label_buf, ':');
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181 | //*result = '\0';
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182 | //return label_buf;
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183 |
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184 | return ifd->iface;
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185 | }
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186 | if (strncmpz(id, "label", idlen) == 0) {
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187 | return ifd->iface;
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188 | }
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189 | for (i = 0; i < ifd->n_options; i++) {
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190 | if (strncmpz(id, ifd->option[i].name, idlen) == 0) {
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191 | return ifd->option[i].value;
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192 | }
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193 | }
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194 | return NULL;
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195 | }
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196 |
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197 | # if ENABLE_FEATURE_IFUPDOWN_IP
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198 | static int count_netmask_bits(const char *dotted_quad)
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199 | {
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200 | // int result;
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201 | // unsigned a, b, c, d;
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202 | // /* Found a netmask... Check if it is dotted quad */
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203 | // if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
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204 | // return -1;
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205 | // if ((a|b|c|d) >> 8)
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206 | // return -1; /* one of numbers is >= 256 */
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207 | // d |= (a << 24) | (b << 16) | (c << 8); /* IP */
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208 | // d = ~d; /* 11110000 -> 00001111 */
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209 |
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210 | /* Shorter version */
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211 | int result;
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212 | struct in_addr ip;
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213 | unsigned d;
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214 |
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215 | if (inet_aton(dotted_quad, &ip) == 0)
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216 | return -1; /* malformed dotted IP */
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217 | d = ntohl(ip.s_addr); /* IP in host order */
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218 | d = ~d; /* 11110000 -> 00001111 */
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219 | if (d & (d+1)) /* check that it is in 00001111 form */
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220 | return -1; /* no it is not */
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221 | result = 32;
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222 | while (d) {
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223 | d >>= 1;
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224 | result--;
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225 | }
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226 | return result;
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227 | }
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228 | # endif
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229 |
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230 | static char *parse(const char *command, struct interface_defn_t *ifd)
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231 | {
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232 | size_t old_pos[MAX_OPT_DEPTH] = { 0 };
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233 | smallint okay[MAX_OPT_DEPTH] = { 1 };
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234 | int opt_depth = 1;
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235 | char *result = NULL;
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236 |
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237 | while (*command) {
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238 | switch (*command) {
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239 | default:
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240 | addstr(&result, command, 1);
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241 | command++;
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242 | break;
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243 | case '\\':
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244 | if (command[1])
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245 | command++;
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246 | addstr(&result, command, 1);
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247 | command++;
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248 | break;
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249 | case '[':
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250 | if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) {
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251 | old_pos[opt_depth] = result ? strlen(result) : 0;
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252 | okay[opt_depth] = 1;
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253 | opt_depth++;
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254 | command += 2;
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255 | } else {
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256 | addstr(&result, command, 1);
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257 | command++;
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258 | }
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259 | break;
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260 | case ']':
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261 | if (command[1] == ']' && opt_depth > 1) {
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262 | opt_depth--;
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263 | if (!okay[opt_depth]) {
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264 | result[old_pos[opt_depth]] = '\0';
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265 | }
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266 | command += 2;
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267 | } else {
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268 | addstr(&result, command, 1);
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269 | command++;
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270 | }
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271 | break;
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272 | case '%':
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273 | {
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274 | char *nextpercent;
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275 | char *varvalue;
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276 |
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277 | command++;
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278 | nextpercent = strchr(command, '%');
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279 | if (!nextpercent) {
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280 | /* Unterminated %var% */
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281 | free(result);
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282 | return NULL;
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283 | }
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284 |
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285 | varvalue = get_var(command, nextpercent - command, ifd);
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286 |
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287 | if (varvalue) {
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288 | # if ENABLE_FEATURE_IFUPDOWN_IP
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289 | /* "hwaddress <class> <address>":
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290 | * unlike ifconfig, ip doesnt want <class>
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291 | * (usually "ether" keyword). Skip it. */
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292 | if (strncmp(command, "hwaddress", 9) == 0) {
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293 | varvalue = skip_whitespace(skip_non_whitespace(varvalue));
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294 | }
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295 | # endif
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296 | addstr(&result, varvalue, strlen(varvalue));
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297 | } else {
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298 | # if ENABLE_FEATURE_IFUPDOWN_IP
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299 | /* Sigh... Add a special case for 'ip' to convert from
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300 | * dotted quad to bit count style netmasks. */
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301 | if (strncmp(command, "bnmask", 6) == 0) {
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302 | unsigned res;
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303 | varvalue = get_var("netmask", 7, ifd);
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304 | if (varvalue) {
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305 | res = count_netmask_bits(varvalue);
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306 | if (res > 0) {
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307 | const char *argument = utoa(res);
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308 | addstr(&result, argument, strlen(argument));
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309 | command = nextpercent + 1;
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310 | break;
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311 | }
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312 | }
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313 | }
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314 | # endif
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315 | okay[opt_depth - 1] = 0;
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316 | }
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317 |
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318 | command = nextpercent + 1;
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319 | }
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320 | break;
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321 | }
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322 | }
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323 |
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324 | if (opt_depth > 1) {
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325 | /* Unbalanced bracket */
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326 | free(result);
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327 | return NULL;
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328 | }
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329 |
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330 | if (!okay[0]) {
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331 | /* Undefined variable and we aren't in a bracket */
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332 | free(result);
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333 | return NULL;
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334 | }
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335 |
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336 | return result;
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337 | }
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338 |
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339 | /* execute() returns 1 for success and 0 for failure */
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340 | static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec)
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341 | {
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342 | char *out;
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343 | int ret;
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344 |
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345 | out = parse(command, ifd);
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346 | if (!out) {
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347 | /* parse error? */
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348 | return 0;
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349 | }
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350 | /* out == "": parsed ok but not all needed variables known, skip */
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351 | ret = out[0] ? (*exec)(out) : 1;
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352 |
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353 | free(out);
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354 | if (ret != 1) {
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355 | return 0;
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356 | }
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357 | return 1;
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358 | }
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359 |
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360 | #endif /* FEATURE_IFUPDOWN_IPV4 || FEATURE_IFUPDOWN_IPV6 */
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361 |
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362 |
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363 | #if ENABLE_FEATURE_IFUPDOWN_IPV6
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364 |
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365 | static int FAST_FUNC loopback_up6(struct interface_defn_t *ifd, execfn *exec)
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366 | {
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367 | # if ENABLE_FEATURE_IFUPDOWN_IP
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368 | int result;
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369 | result = execute("ip addr add ::1 dev %iface%", ifd, exec);
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370 | result += execute("ip link set %iface% up", ifd, exec);
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371 | return ((result == 2) ? 2 : 0);
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372 | # else
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373 | return execute("ifconfig %iface% add ::1", ifd, exec);
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374 | # endif
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375 | }
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376 |
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377 | static int FAST_FUNC loopback_down6(struct interface_defn_t *ifd, execfn *exec)
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378 | {
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379 | # if ENABLE_FEATURE_IFUPDOWN_IP
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380 | return execute("ip link set %iface% down", ifd, exec);
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381 | # else
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382 | return execute("ifconfig %iface% del ::1", ifd, exec);
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383 | # endif
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384 | }
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385 |
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386 | static int FAST_FUNC manual_up_down6(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
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387 | {
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388 | return 1;
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389 | }
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390 |
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391 | static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
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392 | {
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393 | int result;
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394 | # if ENABLE_FEATURE_IFUPDOWN_IP
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395 | result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
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396 | result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
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397 | /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
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398 | result += execute("[[ip route add ::/0 via %gateway%]][[ prio %metric%]]", ifd, exec);
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399 | # else
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400 | result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
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401 | result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
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402 | result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
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403 | # endif
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404 | return ((result == 3) ? 3 : 0);
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405 | }
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406 |
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407 | static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
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408 | {
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409 | # if ENABLE_FEATURE_IFUPDOWN_IP
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410 | return execute("ip link set %iface% down", ifd, exec);
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411 | # else
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412 | return execute("ifconfig %iface% down", ifd, exec);
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413 | # endif
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414 | }
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415 |
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416 | # if ENABLE_FEATURE_IFUPDOWN_IP
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417 | static int FAST_FUNC v4tunnel_up(struct interface_defn_t *ifd, execfn *exec)
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418 | {
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419 | int result;
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420 | result = execute("ip tunnel add %iface% mode sit remote "
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421 | "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec);
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422 | result += execute("ip link set %iface% up", ifd, exec);
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423 | result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec);
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424 | result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
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425 | return ((result == 4) ? 4 : 0);
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426 | }
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427 |
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428 | static int FAST_FUNC v4tunnel_down(struct interface_defn_t * ifd, execfn * exec)
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429 | {
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430 | return execute("ip tunnel del %iface%", ifd, exec);
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431 | }
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432 | # endif
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433 |
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434 | static const struct method_t methods6[] = {
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435 | # if ENABLE_FEATURE_IFUPDOWN_IP
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436 | { "v4tunnel" , v4tunnel_up , v4tunnel_down , },
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437 | # endif
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438 | { "static" , static_up6 , static_down6 , },
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439 | { "manual" , manual_up_down6 , manual_up_down6 , },
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440 | { "loopback" , loopback_up6 , loopback_down6 , },
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441 | };
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442 |
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443 | static const struct address_family_t addr_inet6 = {
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444 | "inet6",
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445 | ARRAY_SIZE(methods6),
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446 | methods6
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447 | };
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448 |
|
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449 | #endif /* FEATURE_IFUPDOWN_IPV6 */
|
---|
450 |
|
---|
451 |
|
---|
452 | #if ENABLE_FEATURE_IFUPDOWN_IPV4
|
---|
453 |
|
---|
454 | static int FAST_FUNC loopback_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
455 | {
|
---|
456 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
457 | int result;
|
---|
458 | result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec);
|
---|
459 | result += execute("ip link set %iface% up", ifd, exec);
|
---|
460 | return ((result == 2) ? 2 : 0);
|
---|
461 | # else
|
---|
462 | return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec);
|
---|
463 | # endif
|
---|
464 | }
|
---|
465 |
|
---|
466 | static int FAST_FUNC loopback_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
467 | {
|
---|
468 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
469 | int result;
|
---|
470 | result = execute("ip addr flush dev %iface%", ifd, exec);
|
---|
471 | result += execute("ip link set %iface% down", ifd, exec);
|
---|
472 | return ((result == 2) ? 2 : 0);
|
---|
473 | # else
|
---|
474 | return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec);
|
---|
475 | # endif
|
---|
476 | }
|
---|
477 |
|
---|
478 | static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
479 | {
|
---|
480 | int result;
|
---|
481 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
482 | result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
|
---|
483 | "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
|
---|
484 | result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
|
---|
485 | result += execute("[[ip route add default via %gateway% dev %iface%[[ prio %metric%]]]]", ifd, exec);
|
---|
486 | return ((result == 3) ? 3 : 0);
|
---|
487 | # else
|
---|
488 | /* ifconfig said to set iface up before it processes hw %hwaddress%,
|
---|
489 | * which then of course fails. Thus we run two separate ifconfig */
|
---|
490 | result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up",
|
---|
491 | ifd, exec);
|
---|
492 | result += execute("ifconfig %iface% %address% netmask %netmask%"
|
---|
493 | "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
|
---|
494 | ifd, exec);
|
---|
495 | result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
|
---|
496 | return ((result == 3) ? 3 : 0);
|
---|
497 | # endif
|
---|
498 | }
|
---|
499 |
|
---|
500 | static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
501 | {
|
---|
502 | int result;
|
---|
503 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
504 | result = execute("ip addr flush dev %iface%", ifd, exec);
|
---|
505 | result += execute("ip link set %iface% down", ifd, exec);
|
---|
506 | # else
|
---|
507 | /* result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); */
|
---|
508 | /* Bringing the interface down deletes the routes in itself.
|
---|
509 | Otherwise this fails if we reference 'gateway' when using this from dhcp_down */
|
---|
510 | result = 1;
|
---|
511 | result += execute("ifconfig %iface% down", ifd, exec);
|
---|
512 | # endif
|
---|
513 | return ((result == 2) ? 2 : 0);
|
---|
514 | }
|
---|
515 |
|
---|
516 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
517 | struct dhcp_client_t {
|
---|
518 | const char *name;
|
---|
519 | const char *startcmd;
|
---|
520 | const char *stopcmd;
|
---|
521 | };
|
---|
522 |
|
---|
523 | static const struct dhcp_client_t ext_dhcp_clients[] = {
|
---|
524 | { "dhcpcd",
|
---|
525 | "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %client%]][[ -l %leasetime%]] %iface%",
|
---|
526 | "dhcpcd -k %iface%",
|
---|
527 | },
|
---|
528 | { "dhclient",
|
---|
529 | "dhclient -pf /var/run/dhclient.%iface%.pid %iface%",
|
---|
530 | "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null",
|
---|
531 | },
|
---|
532 | { "pump",
|
---|
533 | "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]",
|
---|
534 | "pump -i %iface% -k",
|
---|
535 | },
|
---|
536 | { "udhcpc",
|
---|
537 | "udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %client%]]"
|
---|
538 | "[[ -s %script%]][[ %udhcpc_opts%]]",
|
---|
539 | "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
|
---|
540 | },
|
---|
541 | };
|
---|
542 | # endif /* FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
|
---|
543 |
|
---|
544 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
545 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
546 | {
|
---|
547 | unsigned i;
|
---|
548 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
549 | /* ip doesn't up iface when it configures it (unlike ifconfig) */
|
---|
550 | if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
|
---|
551 | return 0;
|
---|
552 | # else
|
---|
553 | /* needed if we have hwaddress on dhcp iface */
|
---|
554 | if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
|
---|
555 | return 0;
|
---|
556 | # endif
|
---|
557 | for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
|
---|
558 | if (exists_execable(ext_dhcp_clients[i].name))
|
---|
559 | return execute(ext_dhcp_clients[i].startcmd, ifd, exec);
|
---|
560 | }
|
---|
561 | bb_error_msg("no dhcp clients found");
|
---|
562 | return 0;
|
---|
563 | }
|
---|
564 | # elif ENABLE_UDHCPC
|
---|
565 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
566 | {
|
---|
567 | # if ENABLE_FEATURE_IFUPDOWN_IP
|
---|
568 | /* ip doesn't up iface when it configures it (unlike ifconfig) */
|
---|
569 | if (!execute("ip link set[[ addr %hwaddress%]] %iface% up", ifd, exec))
|
---|
570 | return 0;
|
---|
571 | # else
|
---|
572 | /* needed if we have hwaddress on dhcp iface */
|
---|
573 | if (!execute("ifconfig %iface%[[ hw %hwaddress%]] up", ifd, exec))
|
---|
574 | return 0;
|
---|
575 | # endif
|
---|
576 | return execute("udhcpc " UDHCPC_CMD_OPTIONS " -p /var/run/udhcpc.%iface%.pid "
|
---|
577 | "-i %iface%[[ -H %hostname%]][[ -c %client%]][[ -s %script%]][[ %udhcpc_opts%]]",
|
---|
578 | ifd, exec);
|
---|
579 | }
|
---|
580 | # else
|
---|
581 | static int FAST_FUNC dhcp_up(struct interface_defn_t *ifd UNUSED_PARAM,
|
---|
582 | execfn *exec UNUSED_PARAM)
|
---|
583 | {
|
---|
584 | return 0; /* no dhcp support */
|
---|
585 | }
|
---|
586 | # endif
|
---|
587 |
|
---|
588 | # if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP
|
---|
589 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
590 | {
|
---|
591 | int result = 0;
|
---|
592 | unsigned i;
|
---|
593 |
|
---|
594 | for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) {
|
---|
595 | if (exists_execable(ext_dhcp_clients[i].name)) {
|
---|
596 | result = execute(ext_dhcp_clients[i].stopcmd, ifd, exec);
|
---|
597 | if (result)
|
---|
598 | break;
|
---|
599 | }
|
---|
600 | }
|
---|
601 |
|
---|
602 | if (!result)
|
---|
603 | bb_error_msg("warning: no dhcp clients found and stopped");
|
---|
604 |
|
---|
605 | /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
|
---|
606 | and it may come back up because udhcpc is still shutting down */
|
---|
607 | usleep(100000);
|
---|
608 | result += static_down(ifd, exec);
|
---|
609 | return ((result == 3) ? 3 : 0);
|
---|
610 | }
|
---|
611 | # elif ENABLE_UDHCPC
|
---|
612 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
613 | {
|
---|
614 | int result;
|
---|
615 | result = execute(
|
---|
616 | "test -f /var/run/udhcpc.%iface%.pid && "
|
---|
617 | "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
|
---|
618 | ifd, exec);
|
---|
619 | /* Also bring the hardware interface down since
|
---|
620 | killing the dhcp client alone doesn't do it.
|
---|
621 | This enables consecutive ifup->ifdown->ifup */
|
---|
622 | /* Sleep a bit, otherwise static_down tries to bring down interface too soon,
|
---|
623 | and it may come back up because udhcpc is still shutting down */
|
---|
624 | usleep(100000);
|
---|
625 | result += static_down(ifd, exec);
|
---|
626 | return ((result == 3) ? 3 : 0);
|
---|
627 | }
|
---|
628 | # else
|
---|
629 | static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd UNUSED_PARAM,
|
---|
630 | execfn *exec UNUSED_PARAM)
|
---|
631 | {
|
---|
632 | return 0; /* no dhcp support */
|
---|
633 | }
|
---|
634 | # endif
|
---|
635 |
|
---|
636 | static int FAST_FUNC manual_up_down(struct interface_defn_t *ifd UNUSED_PARAM, execfn *exec UNUSED_PARAM)
|
---|
637 | {
|
---|
638 | return 1;
|
---|
639 | }
|
---|
640 |
|
---|
641 | static int FAST_FUNC bootp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
642 | {
|
---|
643 | return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%"
|
---|
644 | "[[ --server %server%]][[ --hwaddr %hwaddr%]]"
|
---|
645 | " --returniffail --serverbcast", ifd, exec);
|
---|
646 | }
|
---|
647 |
|
---|
648 | static int FAST_FUNC ppp_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
649 | {
|
---|
650 | return execute("pon[[ %provider%]]", ifd, exec);
|
---|
651 | }
|
---|
652 |
|
---|
653 | static int FAST_FUNC ppp_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
654 | {
|
---|
655 | return execute("poff[[ %provider%]]", ifd, exec);
|
---|
656 | }
|
---|
657 |
|
---|
658 | static int FAST_FUNC wvdial_up(struct interface_defn_t *ifd, execfn *exec)
|
---|
659 | {
|
---|
660 | return execute("start-stop-daemon --start -x wvdial "
|
---|
661 | "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec);
|
---|
662 | }
|
---|
663 |
|
---|
664 | static int FAST_FUNC wvdial_down(struct interface_defn_t *ifd, execfn *exec)
|
---|
665 | {
|
---|
666 | return execute("start-stop-daemon --stop -x wvdial "
|
---|
667 | "-p /var/run/wvdial.%iface% -s 2", ifd, exec);
|
---|
668 | }
|
---|
669 |
|
---|
670 | static const struct method_t methods[] = {
|
---|
671 | { "manual" , manual_up_down, manual_up_down, },
|
---|
672 | { "wvdial" , wvdial_up , wvdial_down , },
|
---|
673 | { "ppp" , ppp_up , ppp_down , },
|
---|
674 | { "static" , static_up , static_down , },
|
---|
675 | { "bootp" , bootp_up , static_down , },
|
---|
676 | { "dhcp" , dhcp_up , dhcp_down , },
|
---|
677 | { "loopback", loopback_up , loopback_down , },
|
---|
678 | };
|
---|
679 |
|
---|
680 | static const struct address_family_t addr_inet = {
|
---|
681 | "inet",
|
---|
682 | ARRAY_SIZE(methods),
|
---|
683 | methods
|
---|
684 | };
|
---|
685 |
|
---|
686 | #endif /* FEATURE_IFUPDOWN_IPV4 */
|
---|
687 |
|
---|
688 |
|
---|
689 | /* Returns pointer to the next word, or NULL.
|
---|
690 | * In 1st case, advances *buf to the word after this one.
|
---|
691 | */
|
---|
692 | static char *next_word(char **buf)
|
---|
693 | {
|
---|
694 | unsigned length;
|
---|
695 | char *word;
|
---|
696 |
|
---|
697 | /* Skip over leading whitespace */
|
---|
698 | word = skip_whitespace(*buf);
|
---|
699 |
|
---|
700 | /* Stop on EOL */
|
---|
701 | if (*word == '\0')
|
---|
702 | return NULL;
|
---|
703 |
|
---|
704 | /* Find the length of this word (can't be 0) */
|
---|
705 | length = strcspn(word, " \t\n");
|
---|
706 |
|
---|
707 | /* Unless we are already at NUL, store NUL and advance */
|
---|
708 | if (word[length] != '\0')
|
---|
709 | word[length++] = '\0';
|
---|
710 |
|
---|
711 | *buf = skip_whitespace(word + length);
|
---|
712 |
|
---|
713 | return word;
|
---|
714 | }
|
---|
715 |
|
---|
716 | static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name)
|
---|
717 | {
|
---|
718 | int i;
|
---|
719 |
|
---|
720 | if (!name)
|
---|
721 | return NULL;
|
---|
722 |
|
---|
723 | for (i = 0; af[i]; i++) {
|
---|
724 | if (strcmp(af[i]->name, name) == 0) {
|
---|
725 | return af[i];
|
---|
726 | }
|
---|
727 | }
|
---|
728 | return NULL;
|
---|
729 | }
|
---|
730 |
|
---|
731 | static const struct method_t *get_method(const struct address_family_t *af, char *name)
|
---|
732 | {
|
---|
733 | int i;
|
---|
734 |
|
---|
735 | if (!name)
|
---|
736 | return NULL;
|
---|
737 | /* TODO: use index_in_str_array() */
|
---|
738 | for (i = 0; i < af->n_methods; i++) {
|
---|
739 | if (strcmp(af->method[i].name, name) == 0) {
|
---|
740 | return &af->method[i];
|
---|
741 | }
|
---|
742 | }
|
---|
743 | return NULL;
|
---|
744 | }
|
---|
745 |
|
---|
746 | static struct interfaces_file_t *read_interfaces(const char *filename)
|
---|
747 | {
|
---|
748 | /* Let's try to be compatible.
|
---|
749 | *
|
---|
750 | * "man 5 interfaces" says:
|
---|
751 | * Lines starting with "#" are ignored. Note that end-of-line
|
---|
752 | * comments are NOT supported, comments must be on a line of their own.
|
---|
753 | * A line may be extended across multiple lines by making
|
---|
754 | * the last character a backslash.
|
---|
755 | *
|
---|
756 | * Seen elsewhere in example config file:
|
---|
757 | * A first non-blank "#" character makes the rest of the line
|
---|
758 | * be ignored. Blank lines are ignored. Lines may be indented freely.
|
---|
759 | * A "\" character at the very end of the line indicates the next line
|
---|
760 | * should be treated as a continuation of the current one.
|
---|
761 | */
|
---|
762 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
763 | struct mapping_defn_t *currmap = NULL;
|
---|
764 | #endif
|
---|
765 | struct interface_defn_t *currif = NULL;
|
---|
766 | struct interfaces_file_t *defn;
|
---|
767 | FILE *f;
|
---|
768 | char *buf;
|
---|
769 | char *first_word;
|
---|
770 | char *rest_of_line;
|
---|
771 | enum { NONE, IFACE, MAPPING } currently_processing = NONE;
|
---|
772 |
|
---|
773 | defn = xzalloc(sizeof(*defn));
|
---|
774 | f = xfopen_for_read(filename);
|
---|
775 |
|
---|
776 | while ((buf = xmalloc_fgetline(f)) != NULL) {
|
---|
777 | #if ENABLE_DESKTOP
|
---|
778 | /* Trailing "\" concatenates lines */
|
---|
779 | char *p;
|
---|
780 | while ((p = last_char_is(buf, '\\')) != NULL) {
|
---|
781 | *p = '\0';
|
---|
782 | rest_of_line = xmalloc_fgetline(f);
|
---|
783 | if (!rest_of_line)
|
---|
784 | break;
|
---|
785 | p = xasprintf("%s%s", buf, rest_of_line);
|
---|
786 | free(buf);
|
---|
787 | free(rest_of_line);
|
---|
788 | buf = p;
|
---|
789 | }
|
---|
790 | #endif
|
---|
791 | rest_of_line = buf;
|
---|
792 | first_word = next_word(&rest_of_line);
|
---|
793 | if (!first_word || *first_word == '#') {
|
---|
794 | free(buf);
|
---|
795 | continue; /* blank/comment line */
|
---|
796 | }
|
---|
797 |
|
---|
798 | if (strcmp(first_word, "mapping") == 0) {
|
---|
799 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
800 | currmap = xzalloc(sizeof(*currmap));
|
---|
801 |
|
---|
802 | while ((first_word = next_word(&rest_of_line)) != NULL) {
|
---|
803 | currmap->match = xrealloc_vector(currmap->match, 4, currmap->n_matches);
|
---|
804 | currmap->match[currmap->n_matches++] = xstrdup(first_word);
|
---|
805 | }
|
---|
806 | /*currmap->n_mappings = 0;*/
|
---|
807 | /*currmap->mapping = NULL;*/
|
---|
808 | /*currmap->script = NULL;*/
|
---|
809 | {
|
---|
810 | struct mapping_defn_t **where = &defn->mappings;
|
---|
811 | while (*where != NULL) {
|
---|
812 | where = &(*where)->next;
|
---|
813 | }
|
---|
814 | *where = currmap;
|
---|
815 | /*currmap->next = NULL;*/
|
---|
816 | }
|
---|
817 | debug_noise("Added mapping\n");
|
---|
818 | #endif
|
---|
819 | currently_processing = MAPPING;
|
---|
820 | } else if (strcmp(first_word, "iface") == 0) {
|
---|
821 | static const struct address_family_t *const addr_fams[] = {
|
---|
822 | #if ENABLE_FEATURE_IFUPDOWN_IPV4
|
---|
823 | &addr_inet,
|
---|
824 | #endif
|
---|
825 | #if ENABLE_FEATURE_IFUPDOWN_IPV6
|
---|
826 | &addr_inet6,
|
---|
827 | #endif
|
---|
828 | NULL
|
---|
829 | };
|
---|
830 | char *iface_name;
|
---|
831 | char *address_family_name;
|
---|
832 | char *method_name;
|
---|
833 | llist_t *iface_list;
|
---|
834 |
|
---|
835 | currif = xzalloc(sizeof(*currif));
|
---|
836 | iface_name = next_word(&rest_of_line);
|
---|
837 | address_family_name = next_word(&rest_of_line);
|
---|
838 | method_name = next_word(&rest_of_line);
|
---|
839 |
|
---|
840 | if (method_name == NULL)
|
---|
841 | bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
|
---|
842 |
|
---|
843 | /* ship any trailing whitespace */
|
---|
844 | rest_of_line = skip_whitespace(rest_of_line);
|
---|
845 |
|
---|
846 | if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
|
---|
847 | bb_error_msg_and_die("too many parameters \"%s\"", buf);
|
---|
848 |
|
---|
849 | currif->iface = xstrdup(iface_name);
|
---|
850 |
|
---|
851 | currif->address_family = get_address_family(addr_fams, address_family_name);
|
---|
852 | if (!currif->address_family)
|
---|
853 | bb_error_msg_and_die("unknown address type \"%s\"", address_family_name);
|
---|
854 |
|
---|
855 | currif->method = get_method(currif->address_family, method_name);
|
---|
856 | if (!currif->method)
|
---|
857 | bb_error_msg_and_die("unknown method \"%s\"", method_name);
|
---|
858 |
|
---|
859 | for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
|
---|
860 | struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
|
---|
861 | if ((strcmp(tmp->iface, currif->iface) == 0)
|
---|
862 | && (tmp->address_family == currif->address_family)
|
---|
863 | ) {
|
---|
864 | bb_error_msg_and_die("duplicate interface \"%s\"", tmp->iface);
|
---|
865 | }
|
---|
866 | }
|
---|
867 | llist_add_to_end(&(defn->ifaces), (char*)currif);
|
---|
868 |
|
---|
869 | debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
|
---|
870 | currently_processing = IFACE;
|
---|
871 | } else if (strcmp(first_word, "auto") == 0) {
|
---|
872 | while ((first_word = next_word(&rest_of_line)) != NULL) {
|
---|
873 |
|
---|
874 | /* Check the interface isnt already listed */
|
---|
875 | if (llist_find_str(defn->autointerfaces, first_word)) {
|
---|
876 | bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
|
---|
877 | }
|
---|
878 |
|
---|
879 | /* Add the interface to the list */
|
---|
880 | llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
|
---|
881 | debug_noise("\nauto %s\n", first_word);
|
---|
882 | }
|
---|
883 | currently_processing = NONE;
|
---|
884 | } else {
|
---|
885 | switch (currently_processing) {
|
---|
886 | case IFACE:
|
---|
887 | if (rest_of_line[0] == '\0')
|
---|
888 | bb_error_msg_and_die("option with empty value \"%s\"", buf);
|
---|
889 |
|
---|
890 | if (strcmp(first_word, "post-up") == 0)
|
---|
891 | first_word += 5; /* "up" */
|
---|
892 | else if (strcmp(first_word, "pre-down") == 0)
|
---|
893 | first_word += 4; /* "down" */
|
---|
894 |
|
---|
895 | /* If not one of "up", "down",... words... */
|
---|
896 | if (index_in_strings(keywords_up_down, first_word) < 0) {
|
---|
897 | int i;
|
---|
898 | for (i = 0; i < currif->n_options; i++) {
|
---|
899 | if (strcmp(currif->option[i].name, first_word) == 0)
|
---|
900 | bb_error_msg_and_die("duplicate option \"%s\"", buf);
|
---|
901 | }
|
---|
902 | }
|
---|
903 | debug_noise("\t%s=%s\n", first_word, rest_of_line);
|
---|
904 | currif->option = xrealloc_vector(currif->option, 4, currif->n_options);
|
---|
905 | currif->option[currif->n_options].name = xstrdup(first_word);
|
---|
906 | currif->option[currif->n_options].value = xstrdup(rest_of_line);
|
---|
907 | currif->n_options++;
|
---|
908 | break;
|
---|
909 | case MAPPING:
|
---|
910 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
911 | if (strcmp(first_word, "script") == 0) {
|
---|
912 | if (currmap->script != NULL)
|
---|
913 | bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
|
---|
914 | currmap->script = xstrdup(next_word(&rest_of_line));
|
---|
915 | } else if (strcmp(first_word, "map") == 0) {
|
---|
916 | currmap->mapping = xrealloc_vector(currmap->mapping, 2, currmap->n_mappings);
|
---|
917 | currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
|
---|
918 | currmap->n_mappings++;
|
---|
919 | } else {
|
---|
920 | bb_error_msg_and_die("misplaced option \"%s\"", buf);
|
---|
921 | }
|
---|
922 | #endif
|
---|
923 | break;
|
---|
924 | case NONE:
|
---|
925 | default:
|
---|
926 | bb_error_msg_and_die("misplaced option \"%s\"", buf);
|
---|
927 | }
|
---|
928 | }
|
---|
929 | free(buf);
|
---|
930 | } /* while (fgets) */
|
---|
931 |
|
---|
932 | if (ferror(f) != 0) {
|
---|
933 | /* ferror does NOT set errno! */
|
---|
934 | bb_error_msg_and_die("%s: I/O error", filename);
|
---|
935 | }
|
---|
936 | fclose(f);
|
---|
937 |
|
---|
938 | return defn;
|
---|
939 | }
|
---|
940 |
|
---|
941 | static char *setlocalenv(const char *format, const char *name, const char *value)
|
---|
942 | {
|
---|
943 | char *result;
|
---|
944 | char *dst;
|
---|
945 | char *src;
|
---|
946 | char c;
|
---|
947 |
|
---|
948 | result = xasprintf(format, name, value);
|
---|
949 |
|
---|
950 | for (dst = src = result; (c = *src) != '=' && c; src++) {
|
---|
951 | if (c == '-')
|
---|
952 | c = '_';
|
---|
953 | if (c >= 'a' && c <= 'z')
|
---|
954 | c -= ('a' - 'A');
|
---|
955 | if (isalnum(c) || c == '_')
|
---|
956 | *dst++ = c;
|
---|
957 | }
|
---|
958 | overlapping_strcpy(dst, src);
|
---|
959 |
|
---|
960 | return result;
|
---|
961 | }
|
---|
962 |
|
---|
963 | static void set_environ(struct interface_defn_t *iface, const char *mode, const char *opt)
|
---|
964 | {
|
---|
965 | int i;
|
---|
966 | char **pp;
|
---|
967 |
|
---|
968 | if (G.my_environ != NULL) {
|
---|
969 | for (pp = G.my_environ; *pp; pp++) {
|
---|
970 | free(*pp);
|
---|
971 | }
|
---|
972 | free(G.my_environ);
|
---|
973 | }
|
---|
974 |
|
---|
975 | /* note: last element will stay NULL: */
|
---|
976 | G.my_environ = xzalloc(sizeof(char *) * (iface->n_options + 7));
|
---|
977 | pp = G.my_environ;
|
---|
978 |
|
---|
979 | for (i = 0; i < iface->n_options; i++) {
|
---|
980 | if (index_in_strings(keywords_up_down, iface->option[i].name) >= 0) {
|
---|
981 | continue;
|
---|
982 | }
|
---|
983 | *pp++ = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);
|
---|
984 | }
|
---|
985 |
|
---|
986 | *pp++ = setlocalenv("%s=%s", "IFACE", iface->iface);
|
---|
987 | *pp++ = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name);
|
---|
988 | *pp++ = setlocalenv("%s=%s", "METHOD", iface->method->name);
|
---|
989 | *pp++ = setlocalenv("%s=%s", "MODE", mode);
|
---|
990 | *pp++ = setlocalenv("%s=%s", "PHASE", opt);
|
---|
991 | if (G.startup_PATH)
|
---|
992 | *pp++ = setlocalenv("%s=%s", "PATH", G.startup_PATH);
|
---|
993 | }
|
---|
994 |
|
---|
995 | static int doit(char *str)
|
---|
996 | {
|
---|
997 | if (option_mask32 & (OPT_no_act|OPT_verbose)) {
|
---|
998 | puts(str);
|
---|
999 | }
|
---|
1000 | if (!(option_mask32 & OPT_no_act)) {
|
---|
1001 | pid_t child;
|
---|
1002 | int status;
|
---|
1003 |
|
---|
1004 | fflush_all();
|
---|
1005 | child = vfork();
|
---|
1006 | if (child < 0) /* failure */
|
---|
1007 | return 0;
|
---|
1008 | if (child == 0) { /* child */
|
---|
1009 | execle(G.shell, G.shell, "-c", str, (char *) NULL, G.my_environ);
|
---|
1010 | _exit(127);
|
---|
1011 | }
|
---|
1012 | safe_waitpid(child, &status, 0);
|
---|
1013 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
---|
1014 | return 0;
|
---|
1015 | }
|
---|
1016 | }
|
---|
1017 | return 1;
|
---|
1018 | }
|
---|
1019 |
|
---|
1020 | static int execute_all(struct interface_defn_t *ifd, const char *opt)
|
---|
1021 | {
|
---|
1022 | int i;
|
---|
1023 | char *buf;
|
---|
1024 | for (i = 0; i < ifd->n_options; i++) {
|
---|
1025 | if (strcmp(ifd->option[i].name, opt) == 0) {
|
---|
1026 | if (!doit(ifd->option[i].value)) {
|
---|
1027 | return 0;
|
---|
1028 | }
|
---|
1029 | }
|
---|
1030 | }
|
---|
1031 |
|
---|
1032 | buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
|
---|
1033 | /* heh, we don't bother free'ing it */
|
---|
1034 | return doit(buf);
|
---|
1035 | }
|
---|
1036 |
|
---|
1037 | static int check(char *str)
|
---|
1038 | {
|
---|
1039 | return str != NULL;
|
---|
1040 | }
|
---|
1041 |
|
---|
1042 | static int iface_up(struct interface_defn_t *iface)
|
---|
1043 | {
|
---|
1044 | if (!iface->method->up(iface, check)) return -1;
|
---|
1045 | set_environ(iface, "start", "pre-up");
|
---|
1046 | if (!execute_all(iface, "pre-up")) return 0;
|
---|
1047 | if (!iface->method->up(iface, doit)) return 0;
|
---|
1048 | set_environ(iface, "start", "post-up");
|
---|
1049 | if (!execute_all(iface, "up")) return 0;
|
---|
1050 | return 1;
|
---|
1051 | }
|
---|
1052 |
|
---|
1053 | static int iface_down(struct interface_defn_t *iface)
|
---|
1054 | {
|
---|
1055 | if (!iface->method->down(iface, check)) return -1;
|
---|
1056 | set_environ(iface, "stop", "pre-down");
|
---|
1057 | if (!execute_all(iface, "down")) return 0;
|
---|
1058 | if (!iface->method->down(iface, doit)) return 0;
|
---|
1059 | set_environ(iface, "stop", "post-down");
|
---|
1060 | if (!execute_all(iface, "post-down")) return 0;
|
---|
1061 | return 1;
|
---|
1062 | }
|
---|
1063 |
|
---|
1064 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
1065 | static int popen2(FILE **in, FILE **out, char *command, char *param)
|
---|
1066 | {
|
---|
1067 | char *argv[3] = { command, param, NULL };
|
---|
1068 | struct fd_pair infd, outfd;
|
---|
1069 | pid_t pid;
|
---|
1070 |
|
---|
1071 | xpiped_pair(infd);
|
---|
1072 | xpiped_pair(outfd);
|
---|
1073 |
|
---|
1074 | fflush_all();
|
---|
1075 | pid = xvfork();
|
---|
1076 |
|
---|
1077 | if (pid == 0) {
|
---|
1078 | /* Child */
|
---|
1079 | /* NB: close _first_, then move fds! */
|
---|
1080 | close(infd.wr);
|
---|
1081 | close(outfd.rd);
|
---|
1082 | xmove_fd(infd.rd, 0);
|
---|
1083 | xmove_fd(outfd.wr, 1);
|
---|
1084 | BB_EXECVP_or_die(argv);
|
---|
1085 | }
|
---|
1086 | /* parent */
|
---|
1087 | close(infd.rd);
|
---|
1088 | close(outfd.wr);
|
---|
1089 | *in = xfdopen_for_write(infd.wr);
|
---|
1090 | *out = xfdopen_for_read(outfd.rd);
|
---|
1091 | return pid;
|
---|
1092 | }
|
---|
1093 |
|
---|
1094 | static char *run_mapping(char *physical, struct mapping_defn_t *map)
|
---|
1095 | {
|
---|
1096 | FILE *in, *out;
|
---|
1097 | int i, status;
|
---|
1098 | pid_t pid;
|
---|
1099 |
|
---|
1100 | char *logical = xstrdup(physical);
|
---|
1101 |
|
---|
1102 | /* Run the mapping script. Never fails. */
|
---|
1103 | pid = popen2(&in, &out, map->script, physical);
|
---|
1104 |
|
---|
1105 | /* Write mappings to stdin of mapping script. */
|
---|
1106 | for (i = 0; i < map->n_mappings; i++) {
|
---|
1107 | fprintf(in, "%s\n", map->mapping[i]);
|
---|
1108 | }
|
---|
1109 | fclose(in);
|
---|
1110 | safe_waitpid(pid, &status, 0);
|
---|
1111 |
|
---|
1112 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
---|
1113 | /* If the mapping script exited successfully, try to
|
---|
1114 | * grab a line of output and use that as the name of the
|
---|
1115 | * logical interface. */
|
---|
1116 | char *new_logical = xmalloc_fgetline(out);
|
---|
1117 |
|
---|
1118 | if (new_logical) {
|
---|
1119 | /* If we are able to read a line of output from the script,
|
---|
1120 | * remove any trailing whitespace and use this value
|
---|
1121 | * as the name of the logical interface. */
|
---|
1122 | char *pch = new_logical + strlen(new_logical) - 1;
|
---|
1123 |
|
---|
1124 | while (pch >= new_logical && isspace(*pch))
|
---|
1125 | *(pch--) = '\0';
|
---|
1126 |
|
---|
1127 | free(logical);
|
---|
1128 | logical = new_logical;
|
---|
1129 | }
|
---|
1130 | }
|
---|
1131 |
|
---|
1132 | fclose(out);
|
---|
1133 |
|
---|
1134 | return logical;
|
---|
1135 | }
|
---|
1136 | #endif /* FEATURE_IFUPDOWN_MAPPING */
|
---|
1137 |
|
---|
1138 | static llist_t *find_iface_state(llist_t *state_list, const char *iface)
|
---|
1139 | {
|
---|
1140 | unsigned iface_len = strlen(iface);
|
---|
1141 | llist_t *search = state_list;
|
---|
1142 |
|
---|
1143 | while (search) {
|
---|
1144 | if ((strncmp(search->data, iface, iface_len) == 0)
|
---|
1145 | && (search->data[iface_len] == '=')
|
---|
1146 | ) {
|
---|
1147 | return search;
|
---|
1148 | }
|
---|
1149 | search = search->link;
|
---|
1150 | }
|
---|
1151 | return NULL;
|
---|
1152 | }
|
---|
1153 |
|
---|
1154 | /* read the previous state from the state file */
|
---|
1155 | static llist_t *read_iface_state(void)
|
---|
1156 | {
|
---|
1157 | llist_t *state_list = NULL;
|
---|
1158 | FILE *state_fp = fopen_for_read(CONFIG_IFUPDOWN_IFSTATE_PATH);
|
---|
1159 |
|
---|
1160 | if (state_fp) {
|
---|
1161 | char *start, *end_ptr;
|
---|
1162 | while ((start = xmalloc_fgets(state_fp)) != NULL) {
|
---|
1163 | /* We should only need to check for a single character */
|
---|
1164 | end_ptr = start + strcspn(start, " \t\n");
|
---|
1165 | *end_ptr = '\0';
|
---|
1166 | llist_add_to(&state_list, start);
|
---|
1167 | }
|
---|
1168 | fclose(state_fp);
|
---|
1169 | }
|
---|
1170 | return state_list;
|
---|
1171 | }
|
---|
1172 |
|
---|
1173 |
|
---|
1174 | int ifupdown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
1175 | int ifupdown_main(int argc UNUSED_PARAM, char **argv)
|
---|
1176 | {
|
---|
1177 | int (*cmds)(struct interface_defn_t *);
|
---|
1178 | struct interfaces_file_t *defn;
|
---|
1179 | llist_t *target_list = NULL;
|
---|
1180 | const char *interfaces = "/etc/network/interfaces";
|
---|
1181 | bool any_failures = 0;
|
---|
1182 |
|
---|
1183 | INIT_G();
|
---|
1184 |
|
---|
1185 | G.startup_PATH = getenv("PATH");
|
---|
1186 | G.shell = xstrdup(get_shell_name());
|
---|
1187 |
|
---|
1188 | cmds = iface_down;
|
---|
1189 | if (applet_name[2] == 'u') {
|
---|
1190 | /* ifup command */
|
---|
1191 | cmds = iface_up;
|
---|
1192 | }
|
---|
1193 |
|
---|
1194 | getopt32(argv, OPTION_STR, &interfaces);
|
---|
1195 | argv += optind;
|
---|
1196 | if (argv[0]) {
|
---|
1197 | if (DO_ALL) bb_show_usage();
|
---|
1198 | } else {
|
---|
1199 | if (!DO_ALL) bb_show_usage();
|
---|
1200 | }
|
---|
1201 |
|
---|
1202 | debug_noise("reading %s file:\n", interfaces);
|
---|
1203 | defn = read_interfaces(interfaces);
|
---|
1204 | debug_noise("\ndone reading %s\n\n", interfaces);
|
---|
1205 |
|
---|
1206 | /* Create a list of interfaces to work on */
|
---|
1207 | if (DO_ALL) {
|
---|
1208 | target_list = defn->autointerfaces;
|
---|
1209 | } else {
|
---|
1210 | llist_add_to_end(&target_list, argv[0]);
|
---|
1211 | }
|
---|
1212 |
|
---|
1213 | /* Update the interfaces */
|
---|
1214 | while (target_list) {
|
---|
1215 | llist_t *iface_list;
|
---|
1216 | struct interface_defn_t *currif;
|
---|
1217 | char *iface;
|
---|
1218 | char *liface;
|
---|
1219 | char *pch;
|
---|
1220 | bool okay = 0;
|
---|
1221 | int cmds_ret;
|
---|
1222 |
|
---|
1223 | iface = xstrdup(target_list->data);
|
---|
1224 | target_list = target_list->link;
|
---|
1225 |
|
---|
1226 | pch = strchr(iface, '=');
|
---|
1227 | if (pch) {
|
---|
1228 | *pch = '\0';
|
---|
1229 | liface = xstrdup(pch + 1);
|
---|
1230 | } else {
|
---|
1231 | liface = xstrdup(iface);
|
---|
1232 | }
|
---|
1233 |
|
---|
1234 | if (!FORCE) {
|
---|
1235 | llist_t *state_list = read_iface_state();
|
---|
1236 | const llist_t *iface_state = find_iface_state(state_list, iface);
|
---|
1237 |
|
---|
1238 | if (cmds == iface_up) {
|
---|
1239 | /* ifup */
|
---|
1240 | if (iface_state) {
|
---|
1241 | bb_error_msg("interface %s already configured", iface);
|
---|
1242 | goto next;
|
---|
1243 | }
|
---|
1244 | } else {
|
---|
1245 | /* ifdown */
|
---|
1246 | if (!iface_state) {
|
---|
1247 | bb_error_msg("interface %s not configured", iface);
|
---|
1248 | goto next;
|
---|
1249 | }
|
---|
1250 | }
|
---|
1251 | llist_free(state_list, free);
|
---|
1252 | }
|
---|
1253 |
|
---|
1254 | #if ENABLE_FEATURE_IFUPDOWN_MAPPING
|
---|
1255 | if ((cmds == iface_up) && !NO_MAPPINGS) {
|
---|
1256 | struct mapping_defn_t *currmap;
|
---|
1257 |
|
---|
1258 | for (currmap = defn->mappings; currmap; currmap = currmap->next) {
|
---|
1259 | int i;
|
---|
1260 | for (i = 0; i < currmap->n_matches; i++) {
|
---|
1261 | if (fnmatch(currmap->match[i], liface, 0) != 0)
|
---|
1262 | continue;
|
---|
1263 | if (VERBOSE) {
|
---|
1264 | printf("Running mapping script %s on %s\n", currmap->script, liface);
|
---|
1265 | }
|
---|
1266 | liface = run_mapping(iface, currmap);
|
---|
1267 | break;
|
---|
1268 | }
|
---|
1269 | }
|
---|
1270 | }
|
---|
1271 | #endif
|
---|
1272 |
|
---|
1273 | iface_list = defn->ifaces;
|
---|
1274 | while (iface_list) {
|
---|
1275 | currif = (struct interface_defn_t *) iface_list->data;
|
---|
1276 | if (strcmp(liface, currif->iface) == 0) {
|
---|
1277 | char *oldiface = currif->iface;
|
---|
1278 |
|
---|
1279 | okay = 1;
|
---|
1280 | currif->iface = iface;
|
---|
1281 |
|
---|
1282 | debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
|
---|
1283 |
|
---|
1284 | /* Call the cmds function pointer, does either iface_up() or iface_down() */
|
---|
1285 | cmds_ret = cmds(currif);
|
---|
1286 | if (cmds_ret == -1) {
|
---|
1287 | bb_error_msg("don't seem to have all the variables for %s/%s",
|
---|
1288 | liface, currif->address_family->name);
|
---|
1289 | any_failures = 1;
|
---|
1290 | } else if (cmds_ret == 0) {
|
---|
1291 | any_failures = 1;
|
---|
1292 | }
|
---|
1293 |
|
---|
1294 | currif->iface = oldiface;
|
---|
1295 | }
|
---|
1296 | iface_list = iface_list->link;
|
---|
1297 | }
|
---|
1298 | if (VERBOSE) {
|
---|
1299 | bb_putchar('\n');
|
---|
1300 | }
|
---|
1301 |
|
---|
1302 | if (!okay && !FORCE) {
|
---|
1303 | bb_error_msg("ignoring unknown interface %s", liface);
|
---|
1304 | any_failures = 1;
|
---|
1305 | } else if (!NO_ACT) {
|
---|
1306 | /* update the state file */
|
---|
1307 | FILE *state_fp;
|
---|
1308 | llist_t *state;
|
---|
1309 | llist_t *state_list = read_iface_state();
|
---|
1310 | llist_t *iface_state = find_iface_state(state_list, iface);
|
---|
1311 |
|
---|
1312 | if (cmds == iface_up && !any_failures) {
|
---|
1313 | char *newiface = xasprintf("%s=%s", iface, liface);
|
---|
1314 | if (!iface_state) {
|
---|
1315 | llist_add_to_end(&state_list, newiface);
|
---|
1316 | } else {
|
---|
1317 | free(iface_state->data);
|
---|
1318 | iface_state->data = newiface;
|
---|
1319 | }
|
---|
1320 | } else {
|
---|
1321 | /* Remove an interface from state_list */
|
---|
1322 | llist_unlink(&state_list, iface_state);
|
---|
1323 | free(llist_pop(&iface_state));
|
---|
1324 | }
|
---|
1325 |
|
---|
1326 | /* Actually write the new state */
|
---|
1327 | state_fp = xfopen_for_write(CONFIG_IFUPDOWN_IFSTATE_PATH);
|
---|
1328 | state = state_list;
|
---|
1329 | while (state) {
|
---|
1330 | if (state->data) {
|
---|
1331 | fprintf(state_fp, "%s\n", state->data);
|
---|
1332 | }
|
---|
1333 | state = state->link;
|
---|
1334 | }
|
---|
1335 | fclose(state_fp);
|
---|
1336 | llist_free(state_list, free);
|
---|
1337 | }
|
---|
1338 | next:
|
---|
1339 | free(iface);
|
---|
1340 | free(liface);
|
---|
1341 | }
|
---|
1342 |
|
---|
1343 | return any_failures;
|
---|
1344 | }
|
---|