1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * simplified modprobe
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4 | *
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5 | * Copyright (c) 2008 Vladimir Dronnikov
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6 | * Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code)
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7 | *
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8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | //applet:IF_MODPROBE_SMALL(APPLET(modprobe, BB_DIR_SBIN, BB_SUID_DROP))
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12 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, depmod))
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13 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, insmod))
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14 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, lsmod))
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15 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, rmmod))
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16 |
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17 | #include "libbb.h"
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18 | /* After libbb.h, since it needs sys/types.h on some systems */
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19 | #include <sys/utsname.h> /* uname() */
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20 | #include <fnmatch.h>
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21 |
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22 | extern int init_module(void *module, unsigned long len, const char *options);
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23 | extern int delete_module(const char *module, unsigned flags);
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24 | /* linux/include/linux/module.h has limit of 64 chars on module names */
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25 | #undef MODULE_NAME_LEN
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26 | #define MODULE_NAME_LEN 64
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27 |
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28 |
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29 | #if 1
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30 | # define dbg1_error_msg(...) ((void)0)
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31 | # define dbg2_error_msg(...) ((void)0)
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32 | #else
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33 | # define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
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34 | # define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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35 | #endif
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36 |
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37 | #define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
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38 |
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39 | enum {
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40 | OPT_q = (1 << 0), /* be quiet */
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41 | OPT_r = (1 << 1), /* module removal instead of loading */
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42 | };
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43 |
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44 | typedef struct module_info {
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45 | char *pathname;
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46 | char *aliases;
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47 | char *deps;
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48 | smallint open_read_failed;
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49 | } module_info;
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50 |
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51 | /*
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52 | * GLOBALS
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53 | */
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54 | struct globals {
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55 | module_info *modinfo;
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56 | char *module_load_options;
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57 | smallint dep_bb_seen;
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58 | smallint wrote_dep_bb_ok;
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59 | unsigned module_count;
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60 | int module_found_idx;
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61 | unsigned stringbuf_idx;
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62 | unsigned stringbuf_size;
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63 | char *stringbuf; /* some modules have lots of stuff */
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64 | /* for example, drivers/media/video/saa7134/saa7134.ko */
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65 | /* therefore having a fixed biggish buffer is not wise */
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66 | };
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67 | #define G (*ptr_to_globals)
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68 | #define modinfo (G.modinfo )
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69 | #define dep_bb_seen (G.dep_bb_seen )
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70 | #define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
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71 | #define module_count (G.module_count )
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72 | #define module_found_idx (G.module_found_idx )
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73 | #define module_load_options (G.module_load_options)
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74 | #define stringbuf_idx (G.stringbuf_idx )
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75 | #define stringbuf_size (G.stringbuf_size )
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76 | #define stringbuf (G.stringbuf )
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77 | #define INIT_G() do { \
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78 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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79 | } while (0)
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80 |
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81 | static void append(const char *s)
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82 | {
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83 | unsigned len = strlen(s);
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84 | if (stringbuf_idx + len + 15 > stringbuf_size) {
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85 | stringbuf_size = stringbuf_idx + len + 127;
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86 | dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
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87 | stringbuf = xrealloc(stringbuf, stringbuf_size);
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88 | }
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89 | memcpy(stringbuf + stringbuf_idx, s, len);
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90 | stringbuf_idx += len;
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91 | }
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92 |
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93 | static void appendc(char c)
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94 | {
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95 | /* We appendc() only after append(), + 15 trick in append()
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96 | * makes it unnecessary to check for overflow here */
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97 | stringbuf[stringbuf_idx++] = c;
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98 | }
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99 |
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100 | static void bksp(void)
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101 | {
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102 | if (stringbuf_idx)
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103 | stringbuf_idx--;
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104 | }
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105 |
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106 | static void reset_stringbuf(void)
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107 | {
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108 | stringbuf_idx = 0;
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109 | }
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110 |
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111 | static char* copy_stringbuf(void)
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112 | {
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113 | char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
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114 | return memcpy(copy, stringbuf, stringbuf_idx);
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115 | }
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116 |
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117 | static char* find_keyword(char *ptr, size_t len, const char *word)
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118 | {
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119 | if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
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120 | return NULL;
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121 |
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122 | len -= strlen(word) - 1;
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123 | while ((ssize_t)len > 0) {
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124 | char *old = ptr;
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125 | char *after_word;
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126 |
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127 | /* search for the first char in word */
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128 | ptr = memchr(ptr, word[0], len);
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129 | if (ptr == NULL) /* no occurance left, done */
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130 | break;
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131 | after_word = is_prefixed_with(ptr, word);
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132 | if (after_word)
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133 | return after_word; /* found, return ptr past it */
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134 | ++ptr;
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135 | len -= (ptr - old);
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136 | }
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137 | return NULL;
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138 | }
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139 |
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140 | static void replace(char *s, char what, char with)
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141 | {
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142 | while (*s) {
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143 | if (what == *s)
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144 | *s = with;
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145 | ++s;
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146 | }
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147 | }
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148 |
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149 | static char *filename2modname(const char *filename, char *modname)
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150 | {
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151 | int i;
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152 | const char *from;
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153 |
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154 | // Disabled since otherwise "modprobe dir/name" would work
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155 | // as if it is "modprobe name". It is unclear why
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156 | // 'basenamization' was here in the first place.
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157 | //from = bb_get_last_path_component_nostrip(filename);
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158 | from = filename;
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159 | for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
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160 | modname[i] = (from[i] == '-') ? '_' : from[i];
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161 | modname[i] = '\0';
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162 |
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163 | return modname;
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164 | }
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165 |
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166 | static int pathname_matches_modname(const char *pathname, const char *modname)
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167 | {
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168 | int r;
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169 | char name[MODULE_NAME_LEN];
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170 | filename2modname(bb_get_last_path_component_nostrip(pathname), name);
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171 | r = (strcmp(name, modname) == 0);
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172 | return r;
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173 | }
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174 |
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175 | /* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
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176 | static char* str_2_list(const char *str)
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177 | {
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178 | int len = strlen(str) + 1;
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179 | char *dst = xmalloc(len + 1);
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180 |
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181 | dst[len] = '\0';
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182 | memcpy(dst, str, len);
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183 | //TODO: protect against 2+ spaces: "word word"
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184 | replace(dst, ' ', '\0');
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185 | return dst;
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186 | }
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187 |
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188 | /* We use error numbers in a loose translation... */
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189 | static const char *moderror(int err)
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190 | {
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191 | switch (err) {
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192 | case ENOEXEC:
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193 | return "invalid module format";
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194 | case ENOENT:
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195 | return "unknown symbol in module or invalid parameter";
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196 | case ESRCH:
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197 | return "module has wrong symbol version";
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198 | case EINVAL: /* "invalid parameter" */
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199 | return "unknown symbol in module or invalid parameter"
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200 | + sizeof("unknown symbol in module or");
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201 | default:
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202 | return strerror(err);
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203 | }
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204 | }
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205 |
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206 | static int load_module(const char *fname, const char *options)
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207 | {
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208 | #if 1
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209 | int r;
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210 | size_t len = MAXINT(ssize_t);
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211 | char *module_image;
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212 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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213 |
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214 | module_image = xmalloc_open_zipped_read_close(fname, &len);
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215 | r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
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216 | free(module_image);
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217 | dbg1_error_msg("load_module:%d", r);
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218 | return r; /* 0 = success */
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219 | #else
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220 | /* For testing */
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221 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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222 | return 1;
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223 | #endif
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224 | }
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225 |
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226 | /* Returns !0 if open/read was unsuccessful */
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227 | static int parse_module(module_info *info, const char *pathname)
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228 | {
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229 | char *module_image;
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230 | char *ptr;
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231 | size_t len;
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232 | size_t pos;
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233 | dbg1_error_msg("parse_module('%s')", pathname);
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234 |
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235 | /* Read (possibly compressed) module */
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236 | errno = 0;
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237 | len = 64 * 1024 * 1024; /* 64 Mb at most */
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238 | module_image = xmalloc_open_zipped_read_close(pathname, &len);
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239 | /* module_image == NULL is ok here, find_keyword handles it */
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240 | //TODO: optimize redundant module body reads
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241 |
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242 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
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243 | reset_stringbuf();
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244 | pos = 0;
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245 | while (1) {
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246 | unsigned start = stringbuf_idx;
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247 | ptr = find_keyword(module_image + pos, len - pos, "alias=");
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248 | if (!ptr) {
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249 | ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
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250 | if (!ptr)
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251 | break;
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252 | /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
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253 | * in many modules. What do they mean? */
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254 | if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
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255 | goto skip;
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256 | dbg2_error_msg("alias:'symbol:%s'", ptr);
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257 | append("symbol:");
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258 | } else {
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259 | dbg2_error_msg("alias:'%s'", ptr);
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260 | }
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261 | append(ptr);
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262 | appendc(' ');
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263 | /*
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264 | * Don't add redundant aliases, such as:
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265 | * libcrc32c.ko symbol:crc32c symbol:crc32c
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266 | */
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267 | if (start) { /* "if we aren't the first alias" */
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268 | char *found, *last;
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269 | stringbuf[stringbuf_idx] = '\0';
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270 | last = stringbuf + start;
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271 | /*
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272 | * String at last-1 is " symbol:crc32c "
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273 | * (with both leading and trailing spaces).
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274 | */
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275 | if (strncmp(stringbuf, last, stringbuf_idx - start) == 0)
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276 | /* First alias matches us */
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277 | found = stringbuf;
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278 | else
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279 | /* Does any other alias match? */
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280 | found = strstr(stringbuf, last-1);
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281 | if (found < last-1) {
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282 | /* There is absolutely the same string before us */
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283 | dbg2_error_msg("redundant:'%s'", last);
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284 | stringbuf_idx = start;
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285 | goto skip;
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286 | }
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287 | }
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288 | skip:
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289 | pos = (ptr - module_image);
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290 | }
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291 | bksp(); /* remove last ' ' */
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292 | info->aliases = copy_stringbuf();
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293 | replace(info->aliases, '-', '_');
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294 |
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295 | /* "dependency1 depandency2" */
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296 | reset_stringbuf();
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297 | ptr = find_keyword(module_image, len, "depends=");
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298 | if (ptr && *ptr) {
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299 | replace(ptr, ',', ' ');
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300 | replace(ptr, '-', '_');
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301 | dbg2_error_msg("dep:'%s'", ptr);
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302 | append(ptr);
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303 | }
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304 | free(module_image);
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305 | info->deps = copy_stringbuf();
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306 |
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307 | info->open_read_failed = (module_image == NULL);
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308 | return info->open_read_failed;
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309 | }
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310 |
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311 | static FAST_FUNC int fileAction(const char *pathname,
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312 | struct stat *sb UNUSED_PARAM,
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313 | void *modname_to_match,
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314 | int depth UNUSED_PARAM)
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315 | {
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316 | int cur;
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317 | const char *fname;
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318 |
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319 | pathname += 2; /* skip "./" */
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320 | fname = bb_get_last_path_component_nostrip(pathname);
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321 | if (!strrstr(fname, ".ko")) {
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322 | dbg1_error_msg("'%s' is not a module", pathname);
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323 | return TRUE; /* not a module, continue search */
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324 | }
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325 |
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326 | cur = module_count++;
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327 | modinfo = xrealloc_vector(modinfo, 12, cur);
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328 | modinfo[cur].pathname = xstrdup(pathname);
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329 | /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
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330 | /*modinfo[cur+1].pathname = NULL;*/
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331 |
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332 | if (!pathname_matches_modname(fname, modname_to_match)) {
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333 | dbg1_error_msg("'%s' module name doesn't match", pathname);
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334 | return TRUE; /* module name doesn't match, continue search */
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335 | }
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336 |
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337 | dbg1_error_msg("'%s' module name matches", pathname);
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338 | module_found_idx = cur;
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339 | if (parse_module(&modinfo[cur], pathname) != 0)
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340 | return TRUE; /* failed to open/read it, no point in trying loading */
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341 |
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342 | if (!(option_mask32 & OPT_r)) {
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343 | if (load_module(pathname, module_load_options) == 0) {
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344 | /* Load was successful, there is nothing else to do.
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345 | * This can happen ONLY for "top-level" module load,
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346 | * not a dep, because deps dont do dirscan. */
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347 | exit(EXIT_SUCCESS);
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348 | }
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349 | }
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350 |
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351 | return TRUE;
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352 | }
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353 |
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354 | static int load_dep_bb(void)
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355 | {
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356 | char *line;
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357 | FILE *fp = fopen_for_read(DEPFILE_BB);
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358 |
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359 | if (!fp)
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360 | return 0;
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361 |
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362 | dep_bb_seen = 1;
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363 | dbg1_error_msg("loading "DEPFILE_BB);
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364 |
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365 | /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
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366 | * we scanned the dir and found no module by name, then we search
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367 | * for alias (full scan), and we decided to generate modprobe.dep.bb.
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368 | * But we see modprobe.dep.bb.new! Other modprobe is at work!
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369 | * We wait and other modprobe renames it to modprobe.dep.bb.
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370 | * Now we can use it.
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371 | * But we already have modinfo[] filled, and "module_count = 0"
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372 | * makes us start anew. Yes, we leak modinfo[].xxx pointers -
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373 | * there is not much of data there anyway. */
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374 | module_count = 0;
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375 | memset(&modinfo[0], 0, sizeof(modinfo[0]));
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376 |
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377 | while ((line = xmalloc_fgetline(fp)) != NULL) {
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378 | char* space;
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379 | char* linebuf;
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380 | int cur;
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381 |
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382 | if (!line[0]) {
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383 | free(line);
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384 | continue;
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385 | }
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386 | space = strchrnul(line, ' ');
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387 | cur = module_count++;
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388 | modinfo = xrealloc_vector(modinfo, 12, cur);
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389 | /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
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390 | modinfo[cur].pathname = line; /* we take ownership of malloced block here */
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391 | if (*space)
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392 | *space++ = '\0';
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393 | modinfo[cur].aliases = space;
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394 | linebuf = xmalloc_fgetline(fp);
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395 | modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
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396 | if (modinfo[cur].deps[0]) {
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397 | /* deps are not "", so next line must be empty */
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398 | line = xmalloc_fgetline(fp);
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399 | /* Refuse to work with damaged config file */
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400 | if (line && line[0])
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401 | bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
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402 | free(line);
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403 | }
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404 | }
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405 | return 1;
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406 | }
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407 |
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408 | static int start_dep_bb_writeout(void)
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409 | {
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410 | int fd;
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411 |
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412 | /* depmod -n: write result to stdout */
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413 | if (applet_name[0] == 'd' && (option_mask32 & 1))
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414 | return STDOUT_FILENO;
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415 |
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416 | fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
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417 | if (fd < 0) {
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418 | if (errno == EEXIST) {
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419 | int count = 5 * 20;
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420 | dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
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421 | while (1) {
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422 | usleep(1000*1000 / 20);
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423 | if (load_dep_bb()) {
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424 | dbg1_error_msg(DEPFILE_BB" appeared");
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425 | return -2; /* magic number */
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426 | }
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427 | if (!--count)
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428 | break;
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429 | }
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430 | bb_error_msg("deleting stale %s", DEPFILE_BB".new");
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431 | fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
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432 | }
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433 | }
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434 | dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
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435 | return fd;
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436 | }
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437 |
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438 | static void write_out_dep_bb(int fd)
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439 | {
|
---|
440 | int i;
|
---|
441 | FILE *fp;
|
---|
442 |
|
---|
443 | /* We want good error reporting. fdprintf is not good enough. */
|
---|
444 | fp = xfdopen_for_write(fd);
|
---|
445 | i = 0;
|
---|
446 | while (modinfo[i].pathname) {
|
---|
447 | fprintf(fp, "%s%s%s\n" "%s%s\n",
|
---|
448 | modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
|
---|
449 | modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
|
---|
450 | i++;
|
---|
451 | }
|
---|
452 | /* Badly formatted depfile is a no-no. Be paranoid. */
|
---|
453 | errno = 0;
|
---|
454 | if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
|
---|
455 | goto err;
|
---|
456 |
|
---|
457 | if (fd == STDOUT_FILENO) /* it was depmod -n */
|
---|
458 | goto ok;
|
---|
459 |
|
---|
460 | if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
|
---|
461 | err:
|
---|
462 | bb_perror_msg("can't create '%s'", DEPFILE_BB);
|
---|
463 | unlink(DEPFILE_BB".new");
|
---|
464 | } else {
|
---|
465 | ok:
|
---|
466 | wrote_dep_bb_ok = 1;
|
---|
467 | dbg1_error_msg("created "DEPFILE_BB);
|
---|
468 | }
|
---|
469 | }
|
---|
470 |
|
---|
471 | static module_info** find_alias(const char *alias)
|
---|
472 | {
|
---|
473 | int i;
|
---|
474 | int dep_bb_fd;
|
---|
475 | int infoidx;
|
---|
476 | module_info **infovec;
|
---|
477 | dbg1_error_msg("find_alias('%s')", alias);
|
---|
478 |
|
---|
479 | try_again:
|
---|
480 | /* First try to find by name (cheaper) */
|
---|
481 | i = 0;
|
---|
482 | while (modinfo[i].pathname) {
|
---|
483 | if (pathname_matches_modname(modinfo[i].pathname, alias)) {
|
---|
484 | dbg1_error_msg("found '%s' in module '%s'",
|
---|
485 | alias, modinfo[i].pathname);
|
---|
486 | if (!modinfo[i].aliases) {
|
---|
487 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
488 | }
|
---|
489 | infovec = xzalloc(2 * sizeof(infovec[0]));
|
---|
490 | infovec[0] = &modinfo[i];
|
---|
491 | return infovec;
|
---|
492 | }
|
---|
493 | i++;
|
---|
494 | }
|
---|
495 |
|
---|
496 | /* Ok, we definitely have to scan module bodies. This is a good
|
---|
497 | * moment to generate modprobe.dep.bb, if it does not exist yet */
|
---|
498 | dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
|
---|
499 | if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
|
---|
500 | goto try_again;
|
---|
501 |
|
---|
502 | /* Scan all module bodies, extract modinfo (it contains aliases) */
|
---|
503 | i = 0;
|
---|
504 | infoidx = 0;
|
---|
505 | infovec = NULL;
|
---|
506 | while (modinfo[i].pathname) {
|
---|
507 | char *desc, *s;
|
---|
508 | if (!modinfo[i].aliases) {
|
---|
509 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
510 | }
|
---|
511 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
|
---|
512 | desc = str_2_list(modinfo[i].aliases);
|
---|
513 | /* Does matching substring exist? */
|
---|
514 | for (s = desc; *s; s += strlen(s) + 1) {
|
---|
515 | /* Aliases in module bodies can be defined with
|
---|
516 | * shell patterns. Example:
|
---|
517 | * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
|
---|
518 | * Plain strcmp() won't catch that */
|
---|
519 | if (fnmatch(s, alias, 0) == 0) {
|
---|
520 | dbg1_error_msg("found alias '%s' in module '%s'",
|
---|
521 | alias, modinfo[i].pathname);
|
---|
522 | infovec = xrealloc_vector(infovec, 1, infoidx);
|
---|
523 | infovec[infoidx++] = &modinfo[i];
|
---|
524 | break;
|
---|
525 | }
|
---|
526 | }
|
---|
527 | free(desc);
|
---|
528 | i++;
|
---|
529 | }
|
---|
530 |
|
---|
531 | /* Create module.dep.bb if needed */
|
---|
532 | if (dep_bb_fd >= 0) {
|
---|
533 | write_out_dep_bb(dep_bb_fd);
|
---|
534 | }
|
---|
535 |
|
---|
536 | dbg1_error_msg("find_alias '%s' returns %d results", alias, infoidx);
|
---|
537 | return infovec;
|
---|
538 | }
|
---|
539 |
|
---|
540 | #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
|
---|
541 | // TODO: open only once, invent config_rewind()
|
---|
542 | static int already_loaded(const char *name)
|
---|
543 | {
|
---|
544 | int ret;
|
---|
545 | char *line;
|
---|
546 | FILE *fp;
|
---|
547 |
|
---|
548 | ret = 5 * 2;
|
---|
549 | again:
|
---|
550 | fp = fopen_for_read("/proc/modules");
|
---|
551 | if (!fp)
|
---|
552 | return 0;
|
---|
553 | while ((line = xmalloc_fgetline(fp)) != NULL) {
|
---|
554 | char *live;
|
---|
555 | char *after_name;
|
---|
556 |
|
---|
557 | // Examples from kernel 3.14.6:
|
---|
558 | //pcspkr 12718 0 - Live 0xffffffffa017e000
|
---|
559 | //snd_timer 28690 2 snd_seq,snd_pcm, Live 0xffffffffa025e000
|
---|
560 | //i915 801405 2 - Live 0xffffffffa0096000
|
---|
561 | after_name = is_prefixed_with(line, name);
|
---|
562 | if (!after_name || *after_name != ' ') {
|
---|
563 | free(line);
|
---|
564 | continue;
|
---|
565 | }
|
---|
566 | live = strstr(line, " Live");
|
---|
567 | free(line);
|
---|
568 | if (!live) {
|
---|
569 | /* State can be Unloading, Loading, or Live.
|
---|
570 | * modprobe must not return prematurely if we see "Loading":
|
---|
571 | * it can cause further programs to assume load completed,
|
---|
572 | * but it did not (yet)!
|
---|
573 | * Wait up to 5*20 ms for it to resolve.
|
---|
574 | */
|
---|
575 | ret -= 2;
|
---|
576 | if (ret == 0)
|
---|
577 | break; /* huh? report as "not loaded" */
|
---|
578 | fclose(fp);
|
---|
579 | usleep(20*1000);
|
---|
580 | goto again;
|
---|
581 | }
|
---|
582 | ret = 1;
|
---|
583 | break;
|
---|
584 | }
|
---|
585 | fclose(fp);
|
---|
586 |
|
---|
587 | return ret & 1;
|
---|
588 | }
|
---|
589 | #else
|
---|
590 | #define already_loaded(name) 0
|
---|
591 | #endif
|
---|
592 |
|
---|
593 | static int rmmod(const char *filename)
|
---|
594 | {
|
---|
595 | int r;
|
---|
596 | char modname[MODULE_NAME_LEN];
|
---|
597 |
|
---|
598 | filename2modname(filename, modname);
|
---|
599 | r = delete_module(modname, O_NONBLOCK | O_EXCL);
|
---|
600 | dbg1_error_msg("delete_module('%s', O_NONBLOCK | O_EXCL):%d", modname, r);
|
---|
601 | if (r != 0 && !(option_mask32 & OPT_q)) {
|
---|
602 | bb_perror_msg("remove '%s'", modname);
|
---|
603 | }
|
---|
604 | return r;
|
---|
605 | }
|
---|
606 |
|
---|
607 | /*
|
---|
608 | * Given modules definition and module name (or alias, or symbol)
|
---|
609 | * load/remove the module respecting dependencies.
|
---|
610 | * NB: also called by depmod with bogus name "/",
|
---|
611 | * just in order to force modprobe.dep.bb creation.
|
---|
612 | */
|
---|
613 | #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
614 | #define process_module(a,b) process_module(a)
|
---|
615 | #define cmdline_options ""
|
---|
616 | #endif
|
---|
617 | static int process_module(char *name, const char *cmdline_options)
|
---|
618 | {
|
---|
619 | char *s, *deps, *options;
|
---|
620 | module_info **infovec;
|
---|
621 | module_info *info;
|
---|
622 | int infoidx;
|
---|
623 | int is_remove = (option_mask32 & OPT_r) != 0;
|
---|
624 | int exitcode = EXIT_SUCCESS;
|
---|
625 |
|
---|
626 | dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
|
---|
627 |
|
---|
628 | replace(name, '-', '_');
|
---|
629 |
|
---|
630 | dbg1_error_msg("already_loaded:%d is_remove:%d", already_loaded(name), is_remove);
|
---|
631 |
|
---|
632 | if (applet_name[0] == 'r') {
|
---|
633 | /* rmmod.
|
---|
634 | * Does not remove dependencies, no need to scan, just remove.
|
---|
635 | * (compat note: this allows and strips .ko suffix)
|
---|
636 | */
|
---|
637 | rmmod(name);
|
---|
638 | return EXIT_SUCCESS;
|
---|
639 | }
|
---|
640 |
|
---|
641 | /*
|
---|
642 | * We used to have "is_remove != already_loaded(name)" check here, but
|
---|
643 | * modprobe -r pci:v00008086d00007010sv00000000sd00000000bc01sc01i80
|
---|
644 | * won't unload modules (there are more than one)
|
---|
645 | * which have this alias.
|
---|
646 | */
|
---|
647 | if (!is_remove && already_loaded(name)) {
|
---|
648 | dbg1_error_msg("nothing to do for '%s'", name);
|
---|
649 | return EXIT_SUCCESS;
|
---|
650 | }
|
---|
651 |
|
---|
652 | options = NULL;
|
---|
653 | if (!is_remove) {
|
---|
654 | char *opt_filename = xasprintf("/etc/modules/%s", name);
|
---|
655 | options = xmalloc_open_read_close(opt_filename, NULL);
|
---|
656 | if (options)
|
---|
657 | replace(options, '\n', ' ');
|
---|
658 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
659 | if (cmdline_options) {
|
---|
660 | /* NB: cmdline_options always have one leading ' '
|
---|
661 | * (see main()), we remove it here */
|
---|
662 | char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
|
---|
663 | cmdline_options + 1, options);
|
---|
664 | free(options);
|
---|
665 | options = op;
|
---|
666 | }
|
---|
667 | #endif
|
---|
668 | free(opt_filename);
|
---|
669 | module_load_options = options;
|
---|
670 | dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
|
---|
671 | }
|
---|
672 |
|
---|
673 | if (!module_count) {
|
---|
674 | /* Scan module directory. This is done only once.
|
---|
675 | * It will attempt module load, and will exit(EXIT_SUCCESS)
|
---|
676 | * on success.
|
---|
677 | */
|
---|
678 | module_found_idx = -1;
|
---|
679 | recursive_action(".",
|
---|
680 | ACTION_RECURSE, /* flags */
|
---|
681 | fileAction, /* file action */
|
---|
682 | NULL, /* dir action */
|
---|
683 | name, /* user data */
|
---|
684 | 0 /* depth */
|
---|
685 | );
|
---|
686 | dbg1_error_msg("dirscan complete");
|
---|
687 | /* Module was not found, or load failed, or is_remove */
|
---|
688 | if (module_found_idx >= 0) { /* module was found */
|
---|
689 | infovec = xzalloc(2 * sizeof(infovec[0]));
|
---|
690 | infovec[0] = &modinfo[module_found_idx];
|
---|
691 | } else { /* search for alias, not a plain module name */
|
---|
692 | infovec = find_alias(name);
|
---|
693 | }
|
---|
694 | } else {
|
---|
695 | infovec = find_alias(name);
|
---|
696 | }
|
---|
697 |
|
---|
698 | if (!infovec) {
|
---|
699 | /* both dirscan and find_alias found nothing */
|
---|
700 | if (!is_remove && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
|
---|
701 | bb_error_msg("module '%s' not found", name);
|
---|
702 | //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
|
---|
703 | goto ret;
|
---|
704 | }
|
---|
705 |
|
---|
706 | /* There can be more than one module for the given alias. For example,
|
---|
707 | * "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
|
---|
708 | * ata_piix because it has alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
|
---|
709 | * and ata_generic, it has alias "pci:v*d*sv*sd*bc01sc01i*"
|
---|
710 | * Standard modprobe loads them both. We achieve it by returning
|
---|
711 | * a *list* of modinfo pointers from find_alias().
|
---|
712 | */
|
---|
713 |
|
---|
714 | /* modprobe -r? unload module(s) */
|
---|
715 | if (is_remove) {
|
---|
716 | infoidx = 0;
|
---|
717 | while ((info = infovec[infoidx++]) != NULL) {
|
---|
718 | int r = rmmod(bb_get_last_path_component_nostrip(info->pathname));
|
---|
719 | if (r != 0) {
|
---|
720 | goto ret; /* error */
|
---|
721 | }
|
---|
722 | }
|
---|
723 | /* modprobe -r: we do not stop here -
|
---|
724 | * continue to unload modules on which the module depends:
|
---|
725 | * "-r --remove: option causes modprobe to remove a module.
|
---|
726 | * If the modules it depends on are also unused, modprobe
|
---|
727 | * will try to remove them, too."
|
---|
728 | */
|
---|
729 | }
|
---|
730 |
|
---|
731 | infoidx = 0;
|
---|
732 | while ((info = infovec[infoidx++]) != NULL) {
|
---|
733 | /* Iterate thru dependencies, trying to (un)load them */
|
---|
734 | deps = str_2_list(info->deps);
|
---|
735 | for (s = deps; *s; s += strlen(s) + 1) {
|
---|
736 | //if (strcmp(name, s) != 0) // N.B. do loops exist?
|
---|
737 | dbg1_error_msg("recurse on dep '%s'", s);
|
---|
738 | process_module(s, NULL);
|
---|
739 | dbg1_error_msg("recurse on dep '%s' done", s);
|
---|
740 | }
|
---|
741 | free(deps);
|
---|
742 |
|
---|
743 | if (is_remove)
|
---|
744 | continue;
|
---|
745 |
|
---|
746 | /* We are modprobe: load it */
|
---|
747 | if (options && strstr(options, "blacklist")) {
|
---|
748 | dbg1_error_msg("'%s': blacklisted", info->pathname);
|
---|
749 | continue;
|
---|
750 | }
|
---|
751 | if (info->open_read_failed) {
|
---|
752 | /* We already tried it, didn't work. Don't try load again */
|
---|
753 | exitcode = EXIT_FAILURE;
|
---|
754 | continue;
|
---|
755 | }
|
---|
756 | errno = 0;
|
---|
757 | if (load_module(info->pathname, options) != 0) {
|
---|
758 | if (EEXIST != errno) {
|
---|
759 | bb_error_msg("'%s': %s",
|
---|
760 | info->pathname,
|
---|
761 | moderror(errno));
|
---|
762 | } else {
|
---|
763 | dbg1_error_msg("'%s': %s",
|
---|
764 | info->pathname,
|
---|
765 | moderror(errno));
|
---|
766 | }
|
---|
767 | exitcode = EXIT_FAILURE;
|
---|
768 | }
|
---|
769 | }
|
---|
770 | ret:
|
---|
771 | free(infovec);
|
---|
772 | free(options);
|
---|
773 |
|
---|
774 | return exitcode;
|
---|
775 | }
|
---|
776 | #undef cmdline_options
|
---|
777 |
|
---|
778 |
|
---|
779 | /* For reference, module-init-tools v3.4 options:
|
---|
780 |
|
---|
781 | # insmod
|
---|
782 | Usage: insmod filename [args]
|
---|
783 |
|
---|
784 | # rmmod --help
|
---|
785 | Usage: rmmod [-fhswvV] modulename ...
|
---|
786 | -f (or --force) forces a module unload, and may crash your
|
---|
787 | machine. This requires the Forced Module Removal option
|
---|
788 | when the kernel was compiled.
|
---|
789 | -h (or --help) prints this help text
|
---|
790 | -s (or --syslog) says use syslog, not stderr
|
---|
791 | -v (or --verbose) enables more messages
|
---|
792 | -V (or --version) prints the version code
|
---|
793 | -w (or --wait) begins module removal even if it is used
|
---|
794 | and will stop new users from accessing the module (so it
|
---|
795 | should eventually fall to zero).
|
---|
796 |
|
---|
797 | # modprobe
|
---|
798 | Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
|
---|
799 | [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
|
---|
800 | modprobe -r [-n] [-i] [-v] <modulename> ...
|
---|
801 | modprobe -l -t <dirname> [ -a <modulename> ...]
|
---|
802 |
|
---|
803 | # depmod --help
|
---|
804 | depmod 3.4 -- part of module-init-tools
|
---|
805 | depmod -[aA] [-n -e -v -q -V -r -u]
|
---|
806 | [-b basedirectory] [forced_version]
|
---|
807 | depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
|
---|
808 | If no arguments (except options) are given, "depmod -a" is assumed.
|
---|
809 | depmod will output a dependency list suitable for the modprobe utility.
|
---|
810 | Options:
|
---|
811 | -a, --all Probe all modules
|
---|
812 | -A, --quick Only does the work if there's a new module
|
---|
813 | -n, --show Write the dependency file on stdout only
|
---|
814 | -e, --errsyms Report not supplied symbols
|
---|
815 | -V, --version Print the release version
|
---|
816 | -v, --verbose Enable verbose mode
|
---|
817 | -h, --help Print this usage message
|
---|
818 | The following options are useful for people managing distributions:
|
---|
819 | -b basedirectory
|
---|
820 | --basedir basedirectory
|
---|
821 | Use an image of a module tree
|
---|
822 | -F kernelsyms
|
---|
823 | --filesyms kernelsyms
|
---|
824 | Use the file instead of the current kernel symbols
|
---|
825 | */
|
---|
826 |
|
---|
827 | //usage:#if ENABLE_MODPROBE_SMALL
|
---|
828 |
|
---|
829 | //usage:#define depmod_trivial_usage NOUSAGE_STR
|
---|
830 | //usage:#define depmod_full_usage ""
|
---|
831 |
|
---|
832 | //usage:#define lsmod_trivial_usage
|
---|
833 | //usage: ""
|
---|
834 | //usage:#define lsmod_full_usage "\n\n"
|
---|
835 | //usage: "List the currently loaded kernel modules"
|
---|
836 |
|
---|
837 | //usage:#define insmod_trivial_usage
|
---|
838 | //usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
|
---|
839 | //usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
|
---|
840 | //usage: "[SYMBOL=VALUE]..."
|
---|
841 | //usage:#define insmod_full_usage "\n\n"
|
---|
842 | //usage: "Load kernel module"
|
---|
843 | //usage: IF_FEATURE_2_4_MODULES( "\n"
|
---|
844 | //usage: "\n -f Force module to load into the wrong kernel version"
|
---|
845 | //usage: "\n -k Make module autoclean-able"
|
---|
846 | //usage: "\n -v Verbose"
|
---|
847 | //usage: "\n -q Quiet"
|
---|
848 | //usage: "\n -L Lock: prevent simultaneous loads"
|
---|
849 | //usage: IF_FEATURE_INSMOD_LOAD_MAP(
|
---|
850 | //usage: "\n -m Output load map to stdout"
|
---|
851 | //usage: )
|
---|
852 | //usage: "\n -x Don't export externs"
|
---|
853 | //usage: )
|
---|
854 |
|
---|
855 | //usage:#define rmmod_trivial_usage
|
---|
856 | //usage: "[-wfa] [MODULE]..."
|
---|
857 | //usage:#define rmmod_full_usage "\n\n"
|
---|
858 | //usage: "Unload kernel modules\n"
|
---|
859 | //usage: "\n -w Wait until the module is no longer used"
|
---|
860 | //usage: "\n -f Force unload"
|
---|
861 | //usage: "\n -a Remove all unused modules (recursively)"
|
---|
862 | //usage:
|
---|
863 | //usage:#define rmmod_example_usage
|
---|
864 | //usage: "$ rmmod tulip\n"
|
---|
865 |
|
---|
866 | //usage:#define modprobe_trivial_usage
|
---|
867 | //usage: "[-qfwrsv] MODULE [SYMBOL=VALUE]..."
|
---|
868 | //usage:#define modprobe_full_usage "\n\n"
|
---|
869 | //usage: " -r Remove MODULE (stacks) or do autoclean"
|
---|
870 | //usage: "\n -q Quiet"
|
---|
871 | //usage: "\n -v Verbose"
|
---|
872 | //usage: "\n -f Force"
|
---|
873 | //usage: "\n -w Wait for unload"
|
---|
874 | //usage: "\n -s Report via syslog instead of stderr"
|
---|
875 |
|
---|
876 | //usage:#endif
|
---|
877 |
|
---|
878 | int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
879 | int modprobe_main(int argc UNUSED_PARAM, char **argv)
|
---|
880 | {
|
---|
881 | int exitcode;
|
---|
882 | struct utsname uts;
|
---|
883 | char applet0 = applet_name[0];
|
---|
884 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
|
---|
885 |
|
---|
886 | /* are we lsmod? -> just dump /proc/modules */
|
---|
887 | if ('l' == applet0) {
|
---|
888 | xprint_and_close_file(xfopen_for_read("/proc/modules"));
|
---|
889 | return EXIT_SUCCESS;
|
---|
890 | }
|
---|
891 |
|
---|
892 | INIT_G();
|
---|
893 |
|
---|
894 | /* Prevent ugly corner cases with no modules at all */
|
---|
895 | modinfo = xzalloc(sizeof(modinfo[0]));
|
---|
896 |
|
---|
897 | if ('i' != applet0) { /* not insmod */
|
---|
898 | /* Goto modules directory */
|
---|
899 | xchdir(CONFIG_DEFAULT_MODULES_DIR);
|
---|
900 | }
|
---|
901 | uname(&uts); /* never fails */
|
---|
902 |
|
---|
903 | /* depmod? */
|
---|
904 | if ('d' == applet0) {
|
---|
905 | /* Supported:
|
---|
906 | * -n: print result to stdout
|
---|
907 | * -a: process all modules (default)
|
---|
908 | * optional VERSION parameter
|
---|
909 | * Ignored:
|
---|
910 | * -A: do work only if a module is newer than depfile
|
---|
911 | * -e: report any symbols which a module needs
|
---|
912 | * which are not supplied by other modules or the kernel
|
---|
913 | * -F FILE: System.map (symbols for -e)
|
---|
914 | * -q, -r, -u: noop?
|
---|
915 | * Not supported:
|
---|
916 | * -b BASEDIR: (TODO!) modules are in
|
---|
917 | * $BASEDIR/lib/modules/$VERSION
|
---|
918 | * -v: human readable deps to stdout
|
---|
919 | * -V: version (don't want to support it - people may depend
|
---|
920 | * on it as an indicator of "standard" depmod)
|
---|
921 | * -h: help (well duh)
|
---|
922 | * module1.o module2.o parameters (just ignored for now)
|
---|
923 | */
|
---|
924 | getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
|
---|
925 | argv += optind;
|
---|
926 | /* if (argv[0] && argv[1]) bb_show_usage(); */
|
---|
927 | /* Goto $VERSION directory */
|
---|
928 | xchdir(argv[0] ? argv[0] : uts.release);
|
---|
929 | /* Force full module scan by asking to find a bogus module.
|
---|
930 | * This will generate modules.dep.bb as a side effect. */
|
---|
931 | process_module((char*)"/", NULL);
|
---|
932 | return !wrote_dep_bb_ok;
|
---|
933 | }
|
---|
934 |
|
---|
935 | /* insmod, modprobe, rmmod require at least one argument */
|
---|
936 | opt_complementary = "-1";
|
---|
937 | /* only -q (quiet) and -r (rmmod),
|
---|
938 | * the rest are accepted and ignored (compat) */
|
---|
939 | getopt32(argv, "qrfsvwb");
|
---|
940 | argv += optind;
|
---|
941 |
|
---|
942 | /* are we rmmod? -> simulate modprobe -r */
|
---|
943 | if ('r' == applet0) {
|
---|
944 | option_mask32 |= OPT_r;
|
---|
945 | }
|
---|
946 |
|
---|
947 | if ('i' != applet0) { /* not insmod */
|
---|
948 | /* Goto $VERSION directory */
|
---|
949 | xchdir(uts.release);
|
---|
950 | }
|
---|
951 |
|
---|
952 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
953 | /* If not rmmod/-r, parse possible module options given on command line.
|
---|
954 | * insmod/modprobe takes one module name, the rest are parameters. */
|
---|
955 | options = NULL;
|
---|
956 | if (!(option_mask32 & OPT_r)) {
|
---|
957 | char **arg = argv;
|
---|
958 | while (*++arg) {
|
---|
959 | /* Enclose options in quotes */
|
---|
960 | char *s = options;
|
---|
961 | options = xasprintf("%s \"%s\"", s ? s : "", *arg);
|
---|
962 | free(s);
|
---|
963 | *arg = NULL;
|
---|
964 | }
|
---|
965 | }
|
---|
966 | #else
|
---|
967 | if (!(option_mask32 & OPT_r))
|
---|
968 | argv[1] = NULL;
|
---|
969 | #endif
|
---|
970 |
|
---|
971 | if ('i' == applet0) { /* insmod */
|
---|
972 | size_t len;
|
---|
973 | void *map;
|
---|
974 |
|
---|
975 | len = MAXINT(ssize_t);
|
---|
976 | map = xmalloc_open_zipped_read_close(*argv, &len);
|
---|
977 | if (!map)
|
---|
978 | bb_perror_msg_and_die("can't read '%s'", *argv);
|
---|
979 | if (init_module(map, len,
|
---|
980 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
|
---|
981 | IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
|
---|
982 | ) != 0
|
---|
983 | ) {
|
---|
984 | bb_error_msg_and_die("can't insert '%s': %s",
|
---|
985 | *argv, moderror(errno));
|
---|
986 | }
|
---|
987 | return EXIT_SUCCESS;
|
---|
988 | }
|
---|
989 |
|
---|
990 | /* Try to load modprobe.dep.bb */
|
---|
991 | if ('r' != applet0) { /* not rmmod */
|
---|
992 | load_dep_bb();
|
---|
993 | }
|
---|
994 |
|
---|
995 | /* Load/remove modules.
|
---|
996 | * Only rmmod/modprobe -r loops here, insmod/modprobe has only argv[0] */
|
---|
997 | exitcode = EXIT_SUCCESS;
|
---|
998 | do {
|
---|
999 | exitcode |= process_module(*argv, options);
|
---|
1000 | } while (*++argv);
|
---|
1001 |
|
---|
1002 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
1003 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
|
---|
1004 | }
|
---|
1005 | return exitcode;
|
---|
1006 | }
|
---|