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, modprobe))
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13 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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14 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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15 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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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 | extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
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25 |
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26 |
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27 | #if 1
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28 | # define dbg1_error_msg(...) ((void)0)
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29 | # define dbg2_error_msg(...) ((void)0)
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30 | #else
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31 | # define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
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32 | # define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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33 | #endif
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34 |
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35 | #define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
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36 |
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37 | enum {
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38 | OPT_q = (1 << 0), /* be quiet */
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39 | OPT_r = (1 << 1), /* module removal instead of loading */
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40 | };
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41 |
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42 | typedef struct module_info {
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43 | char *pathname;
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44 | char *aliases;
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45 | char *deps;
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46 | } module_info;
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47 |
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48 | /*
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49 | * GLOBALS
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50 | */
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51 | struct globals {
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52 | module_info *modinfo;
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53 | char *module_load_options;
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54 | smallint dep_bb_seen;
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55 | smallint wrote_dep_bb_ok;
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56 | unsigned module_count;
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57 | int module_found_idx;
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58 | unsigned stringbuf_idx;
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59 | unsigned stringbuf_size;
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60 | char *stringbuf; /* some modules have lots of stuff */
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61 | /* for example, drivers/media/video/saa7134/saa7134.ko */
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62 | /* therefore having a fixed biggish buffer is not wise */
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63 | };
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64 | #define G (*ptr_to_globals)
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65 | #define modinfo (G.modinfo )
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66 | #define dep_bb_seen (G.dep_bb_seen )
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67 | #define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
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68 | #define module_count (G.module_count )
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69 | #define module_found_idx (G.module_found_idx )
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70 | #define module_load_options (G.module_load_options)
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71 | #define stringbuf_idx (G.stringbuf_idx )
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72 | #define stringbuf_size (G.stringbuf_size )
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73 | #define stringbuf (G.stringbuf )
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74 | #define INIT_G() do { \
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75 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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76 | } while (0)
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77 |
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78 | static void append(const char *s)
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79 | {
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80 | unsigned len = strlen(s);
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81 | if (stringbuf_idx + len + 15 > stringbuf_size) {
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82 | stringbuf_size = stringbuf_idx + len + 127;
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83 | dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
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84 | stringbuf = xrealloc(stringbuf, stringbuf_size);
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85 | }
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86 | memcpy(stringbuf + stringbuf_idx, s, len);
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87 | stringbuf_idx += len;
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88 | }
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89 |
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90 | static void appendc(char c)
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91 | {
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92 | /* We appendc() only after append(), + 15 trick in append()
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93 | * makes it unnecessary to check for overflow here */
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94 | stringbuf[stringbuf_idx++] = c;
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95 | }
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96 |
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97 | static void bksp(void)
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98 | {
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99 | if (stringbuf_idx)
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100 | stringbuf_idx--;
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101 | }
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102 |
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103 | static void reset_stringbuf(void)
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104 | {
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105 | stringbuf_idx = 0;
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106 | }
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107 |
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108 | static char* copy_stringbuf(void)
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109 | {
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110 | char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
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111 | return memcpy(copy, stringbuf, stringbuf_idx);
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112 | }
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113 |
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114 | static char* find_keyword(char *ptr, size_t len, const char *word)
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115 | {
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116 | int wlen;
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117 |
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118 | if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
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119 | return NULL;
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120 |
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121 | wlen = strlen(word);
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122 | len -= wlen - 1;
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123 | while ((ssize_t)len > 0) {
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124 | char *old = ptr;
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125 | /* search for the first char in word */
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126 | ptr = memchr(ptr, *word, len);
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127 | if (ptr == NULL) /* no occurance left, done */
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128 | break;
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129 | if (strncmp(ptr, word, wlen) == 0)
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130 | return ptr + wlen; /* found, return ptr past it */
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131 | ++ptr;
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132 | len -= (ptr - old);
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133 | }
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134 | return NULL;
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135 | }
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136 |
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137 | static void replace(char *s, char what, char with)
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138 | {
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139 | while (*s) {
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140 | if (what == *s)
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141 | *s = with;
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142 | ++s;
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143 | }
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144 | }
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145 |
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146 | /* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
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147 | static char* str_2_list(const char *str)
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148 | {
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149 | int len = strlen(str) + 1;
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150 | char *dst = xmalloc(len + 1);
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151 |
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152 | dst[len] = '\0';
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153 | memcpy(dst, str, len);
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154 | //TODO: protect against 2+ spaces: "word word"
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155 | replace(dst, ' ', '\0');
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156 | return dst;
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157 | }
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158 |
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159 | /* We use error numbers in a loose translation... */
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160 | static const char *moderror(int err)
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161 | {
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162 | switch (err) {
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163 | case ENOEXEC:
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164 | return "invalid module format";
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165 | case ENOENT:
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166 | return "unknown symbol in module or invalid parameter";
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167 | case ESRCH:
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168 | return "module has wrong symbol version";
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169 | case EINVAL: /* "invalid parameter" */
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170 | return "unknown symbol in module or invalid parameter"
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171 | + sizeof("unknown symbol in module or");
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172 | default:
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173 | return strerror(err);
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174 | }
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175 | }
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176 |
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177 | static int load_module(const char *fname, const char *options)
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178 | {
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179 | #if 1
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180 | int r;
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181 | size_t len = MAXINT(ssize_t);
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182 | char *module_image;
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183 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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184 |
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185 | module_image = xmalloc_open_zipped_read_close(fname, &len);
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186 | r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
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187 | free(module_image);
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188 | dbg1_error_msg("load_module:%d", r);
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189 | return r; /* 0 = success */
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190 | #else
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191 | /* For testing */
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192 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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193 | return 1;
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194 | #endif
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195 | }
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196 |
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197 | static void parse_module(module_info *info, const char *pathname)
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198 | {
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199 | char *module_image;
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200 | char *ptr;
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201 | size_t len;
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202 | size_t pos;
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203 | dbg1_error_msg("parse_module('%s')", pathname);
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204 |
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205 | /* Read (possibly compressed) module */
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206 | len = 64 * 1024 * 1024; /* 64 Mb at most */
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207 | module_image = xmalloc_open_zipped_read_close(pathname, &len);
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208 | /* module_image == NULL is ok here, find_keyword handles it */
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209 | //TODO: optimize redundant module body reads
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210 |
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211 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
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212 | reset_stringbuf();
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213 | pos = 0;
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214 | while (1) {
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215 | ptr = find_keyword(module_image + pos, len - pos, "alias=");
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216 | if (!ptr) {
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217 | ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
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218 | if (!ptr)
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219 | break;
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220 | /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
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221 | * in many modules. What do they mean? */
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222 | if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
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223 | goto skip;
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224 | dbg2_error_msg("alias:'symbol:%s'", ptr);
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225 | append("symbol:");
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226 | } else {
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227 | dbg2_error_msg("alias:'%s'", ptr);
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228 | }
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229 | append(ptr);
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230 | appendc(' ');
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231 | skip:
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232 | pos = (ptr - module_image);
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233 | }
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234 | bksp(); /* remove last ' ' */
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235 | info->aliases = copy_stringbuf();
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236 | replace(info->aliases, '-', '_');
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237 |
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238 | /* "dependency1 depandency2" */
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239 | reset_stringbuf();
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240 | ptr = find_keyword(module_image, len, "depends=");
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241 | if (ptr && *ptr) {
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242 | replace(ptr, ',', ' ');
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243 | replace(ptr, '-', '_');
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244 | dbg2_error_msg("dep:'%s'", ptr);
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245 | append(ptr);
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246 | }
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247 | info->deps = copy_stringbuf();
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248 |
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249 | free(module_image);
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250 | }
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251 |
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252 | static int pathname_matches_modname(const char *pathname, const char *modname)
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253 | {
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254 | const char *fname = bb_get_last_path_component_nostrip(pathname);
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255 | const char *suffix = strrstr(fname, ".ko");
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256 | //TODO: can do without malloc?
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257 | char *name = xstrndup(fname, suffix - fname);
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258 | int r;
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259 | replace(name, '-', '_');
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260 | r = (strcmp(name, modname) == 0);
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261 | free(name);
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262 | return r;
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263 | }
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264 |
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265 | static FAST_FUNC int fileAction(const char *pathname,
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266 | struct stat *sb UNUSED_PARAM,
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267 | void *modname_to_match,
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268 | int depth UNUSED_PARAM)
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269 | {
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270 | int cur;
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271 | const char *fname;
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272 |
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273 | pathname += 2; /* skip "./" */
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274 | fname = bb_get_last_path_component_nostrip(pathname);
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275 | if (!strrstr(fname, ".ko")) {
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276 | dbg1_error_msg("'%s' is not a module", pathname);
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277 | return TRUE; /* not a module, continue search */
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278 | }
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279 |
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280 | cur = module_count++;
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281 | modinfo = xrealloc_vector(modinfo, 12, cur);
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282 | modinfo[cur].pathname = xstrdup(pathname);
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283 | /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
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284 | /*modinfo[cur+1].pathname = NULL;*/
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285 |
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286 | if (!pathname_matches_modname(fname, modname_to_match)) {
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287 | dbg1_error_msg("'%s' module name doesn't match", pathname);
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288 | return TRUE; /* module name doesn't match, continue search */
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289 | }
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290 |
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291 | dbg1_error_msg("'%s' module name matches", pathname);
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292 | module_found_idx = cur;
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293 | parse_module(&modinfo[cur], pathname);
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294 |
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295 | if (!(option_mask32 & OPT_r)) {
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296 | if (load_module(pathname, module_load_options) == 0) {
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297 | /* Load was successful, there is nothing else to do.
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298 | * This can happen ONLY for "top-level" module load,
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299 | * not a dep, because deps dont do dirscan. */
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300 | exit(EXIT_SUCCESS);
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301 | }
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302 | }
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303 |
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304 | return TRUE;
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305 | }
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306 |
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307 | static int load_dep_bb(void)
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308 | {
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309 | char *line;
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310 | FILE *fp = fopen_for_read(DEPFILE_BB);
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311 |
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312 | if (!fp)
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313 | return 0;
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314 |
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315 | dep_bb_seen = 1;
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316 | dbg1_error_msg("loading "DEPFILE_BB);
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317 |
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318 | /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
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319 | * we scanned the dir and found no module by name, then we search
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320 | * for alias (full scan), and we decided to generate modprobe.dep.bb.
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321 | * But we see modprobe.dep.bb.new! Other modprobe is at work!
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322 | * We wait and other modprobe renames it to modprobe.dep.bb.
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323 | * Now we can use it.
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324 | * But we already have modinfo[] filled, and "module_count = 0"
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325 | * makes us start anew. Yes, we leak modinfo[].xxx pointers -
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326 | * there is not much of data there anyway. */
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327 | module_count = 0;
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328 | memset(&modinfo[0], 0, sizeof(modinfo[0]));
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329 |
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330 | while ((line = xmalloc_fgetline(fp)) != NULL) {
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331 | char* space;
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332 | char* linebuf;
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333 | int cur;
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334 |
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335 | if (!line[0]) {
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336 | free(line);
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337 | continue;
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338 | }
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339 | space = strchrnul(line, ' ');
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340 | cur = module_count++;
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341 | modinfo = xrealloc_vector(modinfo, 12, cur);
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342 | /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
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343 | modinfo[cur].pathname = line; /* we take ownership of malloced block here */
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344 | if (*space)
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345 | *space++ = '\0';
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346 | modinfo[cur].aliases = space;
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347 | linebuf = xmalloc_fgetline(fp);
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348 | modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
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349 | if (modinfo[cur].deps[0]) {
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350 | /* deps are not "", so next line must be empty */
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351 | line = xmalloc_fgetline(fp);
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352 | /* Refuse to work with damaged config file */
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353 | if (line && line[0])
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354 | bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
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355 | free(line);
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356 | }
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357 | }
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358 | return 1;
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359 | }
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360 |
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361 | static int start_dep_bb_writeout(void)
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362 | {
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363 | int fd;
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364 |
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365 | /* depmod -n: write result to stdout */
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366 | if (applet_name[0] == 'd' && (option_mask32 & 1))
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367 | return STDOUT_FILENO;
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368 |
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369 | fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
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370 | if (fd < 0) {
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371 | if (errno == EEXIST) {
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372 | int count = 5 * 20;
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373 | dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
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374 | while (1) {
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375 | usleep(1000*1000 / 20);
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376 | if (load_dep_bb()) {
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377 | dbg1_error_msg(DEPFILE_BB" appeared");
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378 | return -2; /* magic number */
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379 | }
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380 | if (!--count)
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381 | break;
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382 | }
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383 | bb_error_msg("deleting stale %s", DEPFILE_BB".new");
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384 | fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
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385 | }
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386 | }
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387 | dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
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388 | return fd;
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389 | }
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390 |
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391 | static void write_out_dep_bb(int fd)
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392 | {
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393 | int i;
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394 | FILE *fp;
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395 |
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396 | /* We want good error reporting. fdprintf is not good enough. */
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397 | fp = xfdopen_for_write(fd);
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398 | i = 0;
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399 | while (modinfo[i].pathname) {
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400 | fprintf(fp, "%s%s%s\n" "%s%s\n",
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401 | modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
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402 | modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
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403 | i++;
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404 | }
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405 | /* Badly formatted depfile is a no-no. Be paranoid. */
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406 | errno = 0;
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407 | if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
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408 | goto err;
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409 |
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410 | if (fd == STDOUT_FILENO) /* it was depmod -n */
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411 | goto ok;
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412 |
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413 | if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
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414 | err:
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415 | bb_perror_msg("can't create '%s'", DEPFILE_BB);
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416 | unlink(DEPFILE_BB".new");
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417 | } else {
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418 | ok:
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419 | wrote_dep_bb_ok = 1;
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420 | dbg1_error_msg("created "DEPFILE_BB);
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421 | }
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422 | }
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423 |
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424 | static module_info* find_alias(const char *alias)
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425 | {
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426 | int i;
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427 | int dep_bb_fd;
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428 | module_info *result;
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429 | dbg1_error_msg("find_alias('%s')", alias);
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430 |
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431 | try_again:
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432 | /* First try to find by name (cheaper) */
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433 | i = 0;
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434 | while (modinfo[i].pathname) {
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435 | if (pathname_matches_modname(modinfo[i].pathname, alias)) {
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436 | dbg1_error_msg("found '%s' in module '%s'",
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437 | alias, modinfo[i].pathname);
|
---|
438 | if (!modinfo[i].aliases) {
|
---|
439 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
440 | }
|
---|
441 | return &modinfo[i];
|
---|
442 | }
|
---|
443 | i++;
|
---|
444 | }
|
---|
445 |
|
---|
446 | /* Ok, we definitely have to scan module bodies. This is a good
|
---|
447 | * moment to generate modprobe.dep.bb, if it does not exist yet */
|
---|
448 | dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
|
---|
449 | if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
|
---|
450 | goto try_again;
|
---|
451 |
|
---|
452 | /* Scan all module bodies, extract modinfo (it contains aliases) */
|
---|
453 | i = 0;
|
---|
454 | result = NULL;
|
---|
455 | while (modinfo[i].pathname) {
|
---|
456 | char *desc, *s;
|
---|
457 | if (!modinfo[i].aliases) {
|
---|
458 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
459 | }
|
---|
460 | if (result) {
|
---|
461 | i++;
|
---|
462 | continue;
|
---|
463 | }
|
---|
464 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
|
---|
465 | desc = str_2_list(modinfo[i].aliases);
|
---|
466 | /* Does matching substring exist? */
|
---|
467 | for (s = desc; *s; s += strlen(s) + 1) {
|
---|
468 | /* Aliases in module bodies can be defined with
|
---|
469 | * shell patterns. Example:
|
---|
470 | * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
|
---|
471 | * Plain strcmp() won't catch that */
|
---|
472 | if (fnmatch(s, alias, 0) == 0) {
|
---|
473 | dbg1_error_msg("found alias '%s' in module '%s'",
|
---|
474 | alias, modinfo[i].pathname);
|
---|
475 | result = &modinfo[i];
|
---|
476 | break;
|
---|
477 | }
|
---|
478 | }
|
---|
479 | free(desc);
|
---|
480 | if (result && dep_bb_fd < 0)
|
---|
481 | return result;
|
---|
482 | i++;
|
---|
483 | }
|
---|
484 |
|
---|
485 | /* Create module.dep.bb if needed */
|
---|
486 | if (dep_bb_fd >= 0) {
|
---|
487 | write_out_dep_bb(dep_bb_fd);
|
---|
488 | }
|
---|
489 |
|
---|
490 | dbg1_error_msg("find_alias '%s' returns %p", alias, result);
|
---|
491 | return result;
|
---|
492 | }
|
---|
493 |
|
---|
494 | #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
|
---|
495 | // TODO: open only once, invent config_rewind()
|
---|
496 | static int already_loaded(const char *name)
|
---|
497 | {
|
---|
498 | int ret = 0;
|
---|
499 | char *s;
|
---|
500 | parser_t *parser = config_open2("/proc/modules", xfopen_for_read);
|
---|
501 | while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
|
---|
502 | if (strcmp(s, name) == 0) {
|
---|
503 | ret = 1;
|
---|
504 | break;
|
---|
505 | }
|
---|
506 | }
|
---|
507 | config_close(parser);
|
---|
508 | return ret;
|
---|
509 | }
|
---|
510 | #else
|
---|
511 | #define already_loaded(name) is_rmmod
|
---|
512 | #endif
|
---|
513 |
|
---|
514 | /*
|
---|
515 | * Given modules definition and module name (or alias, or symbol)
|
---|
516 | * load/remove the module respecting dependencies.
|
---|
517 | * NB: also called by depmod with bogus name "/",
|
---|
518 | * just in order to force modprobe.dep.bb creation.
|
---|
519 | */
|
---|
520 | #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
521 | #define process_module(a,b) process_module(a)
|
---|
522 | #define cmdline_options ""
|
---|
523 | #endif
|
---|
524 | static void process_module(char *name, const char *cmdline_options)
|
---|
525 | {
|
---|
526 | char *s, *deps, *options;
|
---|
527 | module_info *info;
|
---|
528 | int is_rmmod = (option_mask32 & OPT_r) != 0;
|
---|
529 | dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
|
---|
530 |
|
---|
531 | replace(name, '-', '_');
|
---|
532 |
|
---|
533 | dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
|
---|
534 | if (already_loaded(name) != is_rmmod) {
|
---|
535 | dbg1_error_msg("nothing to do for '%s'", name);
|
---|
536 | return;
|
---|
537 | }
|
---|
538 |
|
---|
539 | options = NULL;
|
---|
540 | if (!is_rmmod) {
|
---|
541 | char *opt_filename = xasprintf("/etc/modules/%s", name);
|
---|
542 | options = xmalloc_open_read_close(opt_filename, NULL);
|
---|
543 | if (options)
|
---|
544 | replace(options, '\n', ' ');
|
---|
545 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
546 | if (cmdline_options) {
|
---|
547 | /* NB: cmdline_options always have one leading ' '
|
---|
548 | * (see main()), we remove it here */
|
---|
549 | char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
|
---|
550 | cmdline_options + 1, options);
|
---|
551 | free(options);
|
---|
552 | options = op;
|
---|
553 | }
|
---|
554 | #endif
|
---|
555 | free(opt_filename);
|
---|
556 | module_load_options = options;
|
---|
557 | dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
|
---|
558 | }
|
---|
559 |
|
---|
560 | if (!module_count) {
|
---|
561 | /* Scan module directory. This is done only once.
|
---|
562 | * It will attempt module load, and will exit(EXIT_SUCCESS)
|
---|
563 | * on success. */
|
---|
564 | module_found_idx = -1;
|
---|
565 | recursive_action(".",
|
---|
566 | ACTION_RECURSE, /* flags */
|
---|
567 | fileAction, /* file action */
|
---|
568 | NULL, /* dir action */
|
---|
569 | name, /* user data */
|
---|
570 | 0); /* depth */
|
---|
571 | dbg1_error_msg("dirscan complete");
|
---|
572 | /* Module was not found, or load failed, or is_rmmod */
|
---|
573 | if (module_found_idx >= 0) { /* module was found */
|
---|
574 | info = &modinfo[module_found_idx];
|
---|
575 | } else { /* search for alias, not a plain module name */
|
---|
576 | info = find_alias(name);
|
---|
577 | }
|
---|
578 | } else {
|
---|
579 | info = find_alias(name);
|
---|
580 | }
|
---|
581 |
|
---|
582 | // Problem here: there can be more than one module
|
---|
583 | // for the given alias. For example,
|
---|
584 | // "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
|
---|
585 | // ata_piix because it has an alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
|
---|
586 | // and ata_generic, it has an alias "alias=pci:v*d*sv*sd*bc01sc01i*"
|
---|
587 | // Standard modprobe would load them both.
|
---|
588 | // In this code, find_alias() returns only the first matching module.
|
---|
589 |
|
---|
590 | /* rmmod? unload it by name */
|
---|
591 | if (is_rmmod) {
|
---|
592 | if (delete_module(name, O_NONBLOCK | O_EXCL) != 0) {
|
---|
593 | if (!(option_mask32 & OPT_q))
|
---|
594 | bb_perror_msg("remove '%s'", name);
|
---|
595 | goto ret;
|
---|
596 | }
|
---|
597 | /* N.B. we do not stop here -
|
---|
598 | * continue to unload modules on which the module depends:
|
---|
599 | * "-r --remove: option causes modprobe to remove a module.
|
---|
600 | * If the modules it depends on are also unused, modprobe
|
---|
601 | * will try to remove them, too." */
|
---|
602 | }
|
---|
603 |
|
---|
604 | if (!info) {
|
---|
605 | /* both dirscan and find_alias found nothing */
|
---|
606 | if (!is_rmmod && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
|
---|
607 | bb_error_msg("module '%s' not found", name);
|
---|
608 | //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
|
---|
609 | goto ret;
|
---|
610 | }
|
---|
611 |
|
---|
612 | /* Iterate thru dependencies, trying to (un)load them */
|
---|
613 | deps = str_2_list(info->deps);
|
---|
614 | for (s = deps; *s; s += strlen(s) + 1) {
|
---|
615 | //if (strcmp(name, s) != 0) // N.B. do loops exist?
|
---|
616 | dbg1_error_msg("recurse on dep '%s'", s);
|
---|
617 | process_module(s, NULL);
|
---|
618 | dbg1_error_msg("recurse on dep '%s' done", s);
|
---|
619 | }
|
---|
620 | free(deps);
|
---|
621 |
|
---|
622 | /* modprobe -> load it */
|
---|
623 | if (!is_rmmod) {
|
---|
624 | if (!options || strstr(options, "blacklist") == NULL) {
|
---|
625 | errno = 0;
|
---|
626 | if (load_module(info->pathname, options) != 0) {
|
---|
627 | if (EEXIST != errno) {
|
---|
628 | bb_error_msg("'%s': %s",
|
---|
629 | info->pathname,
|
---|
630 | moderror(errno));
|
---|
631 | } else {
|
---|
632 | dbg1_error_msg("'%s': %s",
|
---|
633 | info->pathname,
|
---|
634 | moderror(errno));
|
---|
635 | }
|
---|
636 | }
|
---|
637 | } else {
|
---|
638 | dbg1_error_msg("'%s': blacklisted", info->pathname);
|
---|
639 | }
|
---|
640 | }
|
---|
641 | ret:
|
---|
642 | free(options);
|
---|
643 | //TODO: return load attempt result from process_module.
|
---|
644 | //If dep didn't load ok, continuing makes little sense.
|
---|
645 | }
|
---|
646 | #undef cmdline_options
|
---|
647 |
|
---|
648 |
|
---|
649 | /* For reference, module-init-tools v3.4 options:
|
---|
650 |
|
---|
651 | # insmod
|
---|
652 | Usage: insmod filename [args]
|
---|
653 |
|
---|
654 | # rmmod --help
|
---|
655 | Usage: rmmod [-fhswvV] modulename ...
|
---|
656 | -f (or --force) forces a module unload, and may crash your
|
---|
657 | machine. This requires the Forced Module Removal option
|
---|
658 | when the kernel was compiled.
|
---|
659 | -h (or --help) prints this help text
|
---|
660 | -s (or --syslog) says use syslog, not stderr
|
---|
661 | -v (or --verbose) enables more messages
|
---|
662 | -V (or --version) prints the version code
|
---|
663 | -w (or --wait) begins module removal even if it is used
|
---|
664 | and will stop new users from accessing the module (so it
|
---|
665 | should eventually fall to zero).
|
---|
666 |
|
---|
667 | # modprobe
|
---|
668 | Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
|
---|
669 | [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
|
---|
670 | modprobe -r [-n] [-i] [-v] <modulename> ...
|
---|
671 | modprobe -l -t <dirname> [ -a <modulename> ...]
|
---|
672 |
|
---|
673 | # depmod --help
|
---|
674 | depmod 3.4 -- part of module-init-tools
|
---|
675 | depmod -[aA] [-n -e -v -q -V -r -u]
|
---|
676 | [-b basedirectory] [forced_version]
|
---|
677 | depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
|
---|
678 | If no arguments (except options) are given, "depmod -a" is assumed.
|
---|
679 | depmod will output a dependency list suitable for the modprobe utility.
|
---|
680 | Options:
|
---|
681 | -a, --all Probe all modules
|
---|
682 | -A, --quick Only does the work if there's a new module
|
---|
683 | -n, --show Write the dependency file on stdout only
|
---|
684 | -e, --errsyms Report not supplied symbols
|
---|
685 | -V, --version Print the release version
|
---|
686 | -v, --verbose Enable verbose mode
|
---|
687 | -h, --help Print this usage message
|
---|
688 | The following options are useful for people managing distributions:
|
---|
689 | -b basedirectory
|
---|
690 | --basedir basedirectory
|
---|
691 | Use an image of a module tree
|
---|
692 | -F kernelsyms
|
---|
693 | --filesyms kernelsyms
|
---|
694 | Use the file instead of the current kernel symbols
|
---|
695 | */
|
---|
696 |
|
---|
697 | //usage:#if ENABLE_MODPROBE_SMALL
|
---|
698 |
|
---|
699 | //usage:#define depmod_trivial_usage NOUSAGE_STR
|
---|
700 | //usage:#define depmod_full_usage ""
|
---|
701 |
|
---|
702 | //usage:#define lsmod_trivial_usage
|
---|
703 | //usage: ""
|
---|
704 | //usage:#define lsmod_full_usage "\n\n"
|
---|
705 | //usage: "List the currently loaded kernel modules"
|
---|
706 |
|
---|
707 | //usage:#define insmod_trivial_usage
|
---|
708 | //usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
|
---|
709 | //usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
|
---|
710 | //usage: "[SYMBOL=VALUE]..."
|
---|
711 | //usage:#define insmod_full_usage "\n\n"
|
---|
712 | //usage: "Load the specified kernel modules into the kernel"
|
---|
713 | //usage: IF_FEATURE_2_4_MODULES( "\n"
|
---|
714 | //usage: "\nOptions:"
|
---|
715 | //usage: "\n -f Force module to load into the wrong kernel version"
|
---|
716 | //usage: "\n -k Make module autoclean-able"
|
---|
717 | //usage: "\n -v Verbose"
|
---|
718 | //usage: "\n -q Quiet"
|
---|
719 | //usage: "\n -L Lock: prevent simultaneous loads"
|
---|
720 | //usage: IF_FEATURE_INSMOD_LOAD_MAP(
|
---|
721 | //usage: "\n -m Output load map to stdout"
|
---|
722 | //usage: )
|
---|
723 | //usage: "\n -x Don't export externs"
|
---|
724 | //usage: )
|
---|
725 |
|
---|
726 | //usage:#define rmmod_trivial_usage
|
---|
727 | //usage: "[-wfa] [MODULE]..."
|
---|
728 | //usage:#define rmmod_full_usage "\n\n"
|
---|
729 | //usage: "Unload kernel modules\n"
|
---|
730 | //usage: "\nOptions:"
|
---|
731 | //usage: "\n -w Wait until the module is no longer used"
|
---|
732 | //usage: "\n -f Force unload"
|
---|
733 | //usage: "\n -a Remove all unused modules (recursively)"
|
---|
734 | //usage:
|
---|
735 | //usage:#define rmmod_example_usage
|
---|
736 | //usage: "$ rmmod tulip\n"
|
---|
737 |
|
---|
738 | //usage:#define modprobe_trivial_usage
|
---|
739 | //usage: "[-qfwrsv] MODULE [symbol=value]..."
|
---|
740 | //usage:#define modprobe_full_usage "\n\n"
|
---|
741 | //usage: "Options:"
|
---|
742 | //usage: "\n -r Remove MODULE (stacks) or do autoclean"
|
---|
743 | //usage: "\n -q Quiet"
|
---|
744 | //usage: "\n -v Verbose"
|
---|
745 | //usage: "\n -f Force"
|
---|
746 | //usage: "\n -w Wait for unload"
|
---|
747 | //usage: "\n -s Report via syslog instead of stderr"
|
---|
748 |
|
---|
749 | //usage:#endif
|
---|
750 |
|
---|
751 | int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
752 | int modprobe_main(int argc UNUSED_PARAM, char **argv)
|
---|
753 | {
|
---|
754 | struct utsname uts;
|
---|
755 | char applet0 = applet_name[0];
|
---|
756 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
|
---|
757 |
|
---|
758 | /* are we lsmod? -> just dump /proc/modules */
|
---|
759 | if ('l' == applet0) {
|
---|
760 | xprint_and_close_file(xfopen_for_read("/proc/modules"));
|
---|
761 | return EXIT_SUCCESS;
|
---|
762 | }
|
---|
763 |
|
---|
764 | INIT_G();
|
---|
765 |
|
---|
766 | /* Prevent ugly corner cases with no modules at all */
|
---|
767 | modinfo = xzalloc(sizeof(modinfo[0]));
|
---|
768 |
|
---|
769 | if ('i' != applet0) { /* not insmod */
|
---|
770 | /* Goto modules directory */
|
---|
771 | xchdir(CONFIG_DEFAULT_MODULES_DIR);
|
---|
772 | }
|
---|
773 | uname(&uts); /* never fails */
|
---|
774 |
|
---|
775 | /* depmod? */
|
---|
776 | if ('d' == applet0) {
|
---|
777 | /* Supported:
|
---|
778 | * -n: print result to stdout
|
---|
779 | * -a: process all modules (default)
|
---|
780 | * optional VERSION parameter
|
---|
781 | * Ignored:
|
---|
782 | * -A: do work only if a module is newer than depfile
|
---|
783 | * -e: report any symbols which a module needs
|
---|
784 | * which are not supplied by other modules or the kernel
|
---|
785 | * -F FILE: System.map (symbols for -e)
|
---|
786 | * -q, -r, -u: noop?
|
---|
787 | * Not supported:
|
---|
788 | * -b BASEDIR: (TODO!) modules are in
|
---|
789 | * $BASEDIR/lib/modules/$VERSION
|
---|
790 | * -v: human readable deps to stdout
|
---|
791 | * -V: version (don't want to support it - people may depend
|
---|
792 | * on it as an indicator of "standard" depmod)
|
---|
793 | * -h: help (well duh)
|
---|
794 | * module1.o module2.o parameters (just ignored for now)
|
---|
795 | */
|
---|
796 | getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
|
---|
797 | argv += optind;
|
---|
798 | /* if (argv[0] && argv[1]) bb_show_usage(); */
|
---|
799 | /* Goto $VERSION directory */
|
---|
800 | xchdir(argv[0] ? argv[0] : uts.release);
|
---|
801 | /* Force full module scan by asking to find a bogus module.
|
---|
802 | * This will generate modules.dep.bb as a side effect. */
|
---|
803 | process_module((char*)"/", NULL);
|
---|
804 | return !wrote_dep_bb_ok;
|
---|
805 | }
|
---|
806 |
|
---|
807 | /* insmod, modprobe, rmmod require at least one argument */
|
---|
808 | opt_complementary = "-1";
|
---|
809 | /* only -q (quiet) and -r (rmmod),
|
---|
810 | * the rest are accepted and ignored (compat) */
|
---|
811 | getopt32(argv, "qrfsvw");
|
---|
812 | argv += optind;
|
---|
813 |
|
---|
814 | /* are we rmmod? -> simulate modprobe -r */
|
---|
815 | if ('r' == applet0) {
|
---|
816 | option_mask32 |= OPT_r;
|
---|
817 | }
|
---|
818 |
|
---|
819 | if ('i' != applet0) { /* not insmod */
|
---|
820 | /* Goto $VERSION directory */
|
---|
821 | xchdir(uts.release);
|
---|
822 | }
|
---|
823 |
|
---|
824 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
825 | /* If not rmmod, parse possible module options given on command line.
|
---|
826 | * insmod/modprobe takes one module name, the rest are parameters. */
|
---|
827 | options = NULL;
|
---|
828 | if ('r' != applet0) {
|
---|
829 | char **arg = argv;
|
---|
830 | while (*++arg) {
|
---|
831 | /* Enclose options in quotes */
|
---|
832 | char *s = options;
|
---|
833 | options = xasprintf("%s \"%s\"", s ? s : "", *arg);
|
---|
834 | free(s);
|
---|
835 | *arg = NULL;
|
---|
836 | }
|
---|
837 | }
|
---|
838 | #else
|
---|
839 | if ('r' != applet0)
|
---|
840 | argv[1] = NULL;
|
---|
841 | #endif
|
---|
842 |
|
---|
843 | if ('i' == applet0) { /* insmod */
|
---|
844 | size_t len;
|
---|
845 | void *map;
|
---|
846 |
|
---|
847 | len = MAXINT(ssize_t);
|
---|
848 | map = xmalloc_open_zipped_read_close(*argv, &len);
|
---|
849 | if (!map)
|
---|
850 | bb_perror_msg_and_die("can't read '%s'", *argv);
|
---|
851 | if (init_module(map, len,
|
---|
852 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
|
---|
853 | IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
|
---|
854 | ) != 0
|
---|
855 | ) {
|
---|
856 | bb_error_msg_and_die("can't insert '%s': %s",
|
---|
857 | *argv, moderror(errno));
|
---|
858 | }
|
---|
859 | return 0;
|
---|
860 | }
|
---|
861 |
|
---|
862 | /* Try to load modprobe.dep.bb */
|
---|
863 | load_dep_bb();
|
---|
864 |
|
---|
865 | /* Load/remove modules.
|
---|
866 | * Only rmmod loops here, modprobe has only argv[0] */
|
---|
867 | do {
|
---|
868 | process_module(*argv, options);
|
---|
869 | } while (*++argv);
|
---|
870 |
|
---|
871 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
872 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
|
---|
873 | }
|
---|
874 | return EXIT_SUCCESS;
|
---|
875 | }
|
---|