1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * depmod - generate modules.dep
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4 | * Copyright (c) 2008 Bernhard Reutner-Fischer
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5 | * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
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6 | * Copyright (c) 2008 Vladimir Dronnikov
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | //applet:IF_DEPMOD(APPLET(depmod, _BB_DIR_SBIN, _BB_SUID_DROP))
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12 |
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13 | //usage:#if !ENABLE_MODPROBE_SMALL
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14 | //usage:#define depmod_trivial_usage NOUSAGE_STR
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15 | //usage:#define depmod_full_usage ""
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16 | //usage:#endif
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17 |
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18 | #include "libbb.h"
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19 | #include "modutils.h"
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20 | #include <sys/utsname.h> /* uname() */
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21 |
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22 | /*
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23 | * Theory of operation:
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24 | * - iterate over all modules and record their full path
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25 | * - iterate over all modules looking for "depends=" entries
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26 | * for each depends, look through our list of full paths and emit if found
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27 | */
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28 |
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29 | typedef struct module_info {
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30 | struct module_info *next;
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31 | char *name, *modname;
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32 | llist_t *dependencies;
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33 | llist_t *aliases;
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34 | llist_t *symbols;
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35 | struct module_info *dnext, *dprev;
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36 | } module_info;
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37 |
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38 | static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
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39 | void *data, int depth UNUSED_PARAM)
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40 | {
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41 | char modname[MODULE_NAME_LEN];
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42 | module_info **first = (module_info **) data;
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43 | char *image, *ptr;
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44 | module_info *info;
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45 | /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
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46 | size_t len = (64*1024*1024 - 4096);
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47 |
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48 | if (strrstr(fname, ".ko") == NULL)
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49 | return TRUE;
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50 |
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51 | image = xmalloc_open_zipped_read_close(fname, &len);
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52 | info = xzalloc(sizeof(*info));
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53 |
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54 | info->next = *first;
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55 | *first = info;
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56 |
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57 | info->dnext = info->dprev = info;
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58 | info->name = xstrdup(fname + 2); /* skip "./" */
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59 | info->modname = xstrdup(filename2modname(fname, modname));
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60 | for (ptr = image; ptr < image + len - 10; ptr++) {
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61 | if (strncmp(ptr, "depends=", 8) == 0) {
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62 | char *u;
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63 |
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64 | ptr += 8;
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65 | for (u = ptr; *u; u++)
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66 | if (*u == '-')
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67 | *u = '_';
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68 | ptr += string_to_llist(ptr, &info->dependencies, ",");
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69 | } else if (ENABLE_FEATURE_MODUTILS_ALIAS
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70 | && strncmp(ptr, "alias=", 6) == 0
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71 | ) {
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72 | llist_add_to(&info->aliases, xstrdup(ptr + 6));
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73 | ptr += strlen(ptr);
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74 | } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
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75 | && strncmp(ptr, "__ksymtab_", 10) == 0
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76 | ) {
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77 | ptr += 10;
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78 | if (strncmp(ptr, "gpl", 3) == 0
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79 | || strcmp(ptr, "strings") == 0
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80 | ) {
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81 | continue;
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82 | }
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83 | llist_add_to(&info->symbols, xstrdup(ptr));
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84 | ptr += strlen(ptr);
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85 | }
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86 | }
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87 | free(image);
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88 |
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89 | return TRUE;
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90 | }
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91 |
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92 | static module_info *find_module(module_info *modules, const char *modname)
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93 | {
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94 | module_info *m;
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95 |
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96 | for (m = modules; m != NULL; m = m->next)
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97 | if (strcmp(m->modname, modname) == 0)
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98 | return m;
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99 | return NULL;
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100 | }
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101 |
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102 | static void order_dep_list(module_info *modules, module_info *start,
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103 | llist_t *add)
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104 | {
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105 | module_info *m;
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106 | llist_t *n;
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107 |
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108 | for (n = add; n != NULL; n = n->link) {
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109 | m = find_module(modules, n->data);
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110 | if (m == NULL)
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111 | continue;
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112 |
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113 | /* unlink current entry */
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114 | m->dnext->dprev = m->dprev;
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115 | m->dprev->dnext = m->dnext;
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116 |
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117 | /* and add it to tail */
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118 | m->dnext = start;
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119 | m->dprev = start->dprev;
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120 | start->dprev->dnext = m;
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121 | start->dprev = m;
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122 |
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123 | /* recurse */
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124 | order_dep_list(modules, start, m->dependencies);
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125 | }
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126 | }
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127 |
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128 | static void xfreopen_write(const char *file, FILE *f)
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129 | {
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130 | if (freopen(file, "w", f) == NULL)
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131 | bb_perror_msg_and_die("can't open '%s'", file);
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132 | }
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133 |
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134 | /* Usage:
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135 | * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
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136 | * -a --all
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137 | * Probe all modules. Default if no MODFILES.
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138 | * -A --quick
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139 | * Check modules.dep's mtime against module files' mtimes.
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140 | * -b --basedir BASE
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141 | * Use $BASE/lib/modules/VERSION
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142 | * -C --config FILE or DIR
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143 | * Path to /etc/depmod.conf or /etc/depmod.d/
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144 | * -e --errsyms
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145 | * When combined with the -F option, this reports any symbols which
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146 | * which are not supplied by other modules or kernel.
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147 | * -F --filesyms System.map
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148 | * -n --dry-run
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149 | * Print modules.dep etc to standard output
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150 | * -v --verbose
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151 | * Print to stdout all the symbols each module depends on
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152 | * and the module's file name which provides that symbol.
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153 | * -r No-op
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154 | * -u No-op
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155 | * -q No-op
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156 | *
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157 | * So far we only support: [-rn] [-b BASE] [VERSION] [MODFILES]...
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158 | * -aAeF are accepted but ignored. -vC are not accepted.
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159 | */
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160 | enum {
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161 | //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
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162 | //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
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163 | OPT_b = (1 << 2), /* base directory when modules are in staging area */
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164 | //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
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165 | //OPT_F = (1 << 4), /* System.map that contains the symbols */
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166 | OPT_n = (1 << 5), /* dry-run, print to stdout only */
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167 | OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
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168 | OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
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169 | OPT_q = (1 << 8), /* -q,--quiet: ignored */
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170 | OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
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171 | };
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172 |
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173 | int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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174 | int depmod_main(int argc UNUSED_PARAM, char **argv)
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175 | {
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176 | module_info *modules, *m, *dep;
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177 | const char *moddir_base = "/";
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178 | char *moddir, *version;
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179 | struct utsname uts;
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180 | int tmp;
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181 |
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182 | getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
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183 | argv += optind;
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184 |
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185 | /* goto modules location */
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186 | xchdir(moddir_base);
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187 |
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188 | /* If a version is provided, then that kernel version's module directory
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189 | * is used, rather than the current kernel version (as returned by
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190 | * "uname -r"). */
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191 | if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
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192 | version = *argv++;
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193 | } else {
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194 | uname(&uts);
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195 | version = uts.release;
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196 | }
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197 | moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
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198 | xchdir(moddir);
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199 | if (ENABLE_FEATURE_CLEAN_UP)
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200 | free(moddir);
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201 |
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202 | /* Scan modules */
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203 | modules = NULL;
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204 | if (*argv) {
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205 | do {
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206 | parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
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207 | } while (*++argv);
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208 | } else {
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209 | recursive_action(".", ACTION_RECURSE,
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210 | parse_module, NULL, &modules, 0);
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211 | }
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212 |
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213 | /* Generate dependency and alias files */
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214 | if (!(option_mask32 & OPT_n))
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215 | xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
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216 | for (m = modules; m != NULL; m = m->next) {
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217 | printf("%s:", m->name);
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218 |
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219 | order_dep_list(modules, m, m->dependencies);
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220 | while (m->dnext != m) {
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221 | dep = m->dnext;
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222 | printf(" %s", dep->name);
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223 |
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224 | /* unlink current entry */
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225 | dep->dnext->dprev = dep->dprev;
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226 | dep->dprev->dnext = dep->dnext;
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227 | dep->dnext = dep->dprev = dep;
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228 | }
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229 | bb_putchar('\n');
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230 | }
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231 |
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232 | #if ENABLE_FEATURE_MODUTILS_ALIAS
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233 | if (!(option_mask32 & OPT_n))
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234 | xfreopen_write("modules.alias", stdout);
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235 | for (m = modules; m != NULL; m = m->next) {
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236 | const char *fname = bb_basename(m->name);
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237 | int fnlen = strchrnul(fname, '.') - fname;
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238 | while (m->aliases) {
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239 | /* Last word can well be m->modname instead,
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240 | * but depmod from module-init-tools 3.4
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241 | * uses module basename, i.e., no s/-/_/g.
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242 | * (pathname and .ko.* are still stripped)
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243 | * Mimicking that... */
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244 | printf("alias %s %.*s\n",
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245 | (char*)llist_pop(&m->aliases),
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246 | fnlen, fname);
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247 | }
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248 | }
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249 | #endif
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250 | #if ENABLE_FEATURE_MODUTILS_SYMBOLS
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251 | if (!(option_mask32 & OPT_n))
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252 | xfreopen_write("modules.symbols", stdout);
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253 | for (m = modules; m != NULL; m = m->next) {
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254 | const char *fname = bb_basename(m->name);
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255 | int fnlen = strchrnul(fname, '.') - fname;
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256 | while (m->symbols) {
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257 | printf("alias symbol:%s %.*s\n",
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258 | (char*)llist_pop(&m->symbols),
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259 | fnlen, fname);
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260 | }
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261 | }
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262 | #endif
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263 |
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264 | if (ENABLE_FEATURE_CLEAN_UP) {
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265 | while (modules) {
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266 | module_info *old = modules;
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267 | modules = modules->next;
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268 | free(old->name);
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269 | free(old->modname);
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270 | free(old);
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271 | }
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272 | }
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273 |
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274 | return EXIT_SUCCESS;
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275 | }
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