1 | /*
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2 | * Common modutils related functions for busybox
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3 | *
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4 | * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi>
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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7 | */
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8 | #include "modutils.h"
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9 |
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10 | #ifdef __UCLIBC__
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11 | extern int init_module(void *module, unsigned long len, const char *options);
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12 | extern int delete_module(const char *module, unsigned int flags);
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13 | #else
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14 | # include <sys/syscall.h>
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15 | # define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
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16 | # define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
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17 | #endif
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18 |
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19 | static module_entry *helper_get_module(module_db *db, const char *module, int create)
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20 | {
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21 | char modname[MODULE_NAME_LEN];
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22 | struct module_entry *e;
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23 | unsigned i, hash;
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24 |
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25 | filename2modname(module, modname);
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26 |
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27 | hash = 0;
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28 | for (i = 0; modname[i]; i++)
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29 | hash = ((hash << 5) + hash) + modname[i];
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30 | hash %= MODULE_HASH_SIZE;
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31 |
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32 | for (e = db->buckets[hash]; e; e = e->next)
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33 | if (strcmp(e->modname, modname) == 0)
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34 | return e;
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35 | if (!create)
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36 | return NULL;
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37 |
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38 | e = xzalloc(sizeof(*e));
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39 | e->modname = xstrdup(modname);
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40 | e->next = db->buckets[hash];
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41 | db->buckets[hash] = e;
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42 | IF_DEPMOD(e->dnext = e->dprev = e;)
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43 |
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44 | return e;
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45 | }
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46 | module_entry* FAST_FUNC moddb_get(module_db *db, const char *module)
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47 | {
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48 | return helper_get_module(db, module, 0);
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49 | }
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50 | module_entry* FAST_FUNC moddb_get_or_create(module_db *db, const char *module)
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51 | {
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52 | return helper_get_module(db, module, 1);
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53 | }
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54 |
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55 | void FAST_FUNC moddb_free(module_db *db)
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56 | {
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57 | module_entry *e, *n;
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58 | unsigned i;
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59 |
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60 | for (i = 0; i < MODULE_HASH_SIZE; i++) {
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61 | for (e = db->buckets[i]; e; e = n) {
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62 | n = e->next;
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63 | free(e->name);
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64 | free(e->modname);
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65 | free(e);
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66 | }
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67 | }
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68 | }
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69 |
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70 | void FAST_FUNC replace(char *s, char what, char with)
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71 | {
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72 | while (*s) {
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73 | if (what == *s)
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74 | *s = with;
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75 | ++s;
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76 | }
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77 | }
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78 |
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79 | char* FAST_FUNC replace_underscores(char *s)
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80 | {
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81 | replace(s, '-', '_');
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82 | return s;
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83 | }
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84 |
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85 | int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
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86 | {
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87 | char *tok;
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88 | int len = 0;
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89 |
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90 | while ((tok = strsep(&string, delim)) != NULL) {
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91 | if (tok[0] == '\0')
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92 | continue;
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93 | llist_add_to_end(llist, xstrdup(tok));
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94 | len += strlen(tok);
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95 | }
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96 | return len;
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97 | }
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98 |
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99 | char* FAST_FUNC filename2modname(const char *filename, char *modname)
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100 | {
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101 | char local_modname[MODULE_NAME_LEN];
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102 | int i;
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103 | const char *from;
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104 |
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105 | if (filename == NULL)
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106 | return NULL;
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107 | if (modname == NULL)
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108 | modname = local_modname;
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109 | // Disabled since otherwise "modprobe dir/name" would work
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110 | // as if it is "modprobe name". It is unclear why
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111 | // 'basenamization' was here in the first place.
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112 | //from = bb_get_last_path_component_nostrip(filename);
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113 | from = filename;
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114 | for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
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115 | modname[i] = (from[i] == '-') ? '_' : from[i];
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116 | modname[i] = '\0';
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117 |
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118 | if (modname == local_modname)
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119 | return xstrdup(modname);
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120 |
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121 | return modname;
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122 | }
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123 |
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124 | char* FAST_FUNC parse_cmdline_module_options(char **argv, int quote_spaces)
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125 | {
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126 | char *options;
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127 | int optlen;
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128 |
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129 | options = xzalloc(1);
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130 | optlen = 0;
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131 | while (*++argv) {
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132 | const char *fmt;
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133 | const char *var;
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134 | const char *val;
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135 |
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136 | var = *argv;
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137 | options = xrealloc(options, optlen + 2 + strlen(var) + 2);
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138 | fmt = "%.*s%s ";
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139 | val = strchrnul(var, '=');
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140 | if (quote_spaces) {
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141 | /*
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142 | * modprobe (module-init-tools version 3.11.1) compat:
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143 | * quote only value:
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144 | * var="val with spaces", not "var=val with spaces"
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145 | * (note: var *name* is not checked for spaces!)
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146 | */
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147 | if (*val) { /* has var=val format. skip '=' */
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148 | val++;
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149 | if (strchr(val, ' '))
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150 | fmt = "%.*s\"%s\" ";
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151 | }
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152 | }
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153 | optlen += sprintf(options + optlen, fmt, (int)(val - var), var, val);
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154 | }
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155 | /* Remove trailing space. Disabled */
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156 | /* if (optlen != 0) options[optlen-1] = '\0'; */
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157 | return options;
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158 | }
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159 |
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160 | #if ENABLE_FEATURE_INSMOD_TRY_MMAP
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161 | void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p)
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162 | {
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163 | /* We have user reports of failure to load 3MB module
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164 | * on a 16MB RAM machine. Apparently even a transient
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165 | * memory spike to 6MB during module load
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166 | * is too big for that system. */
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167 | void *image;
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168 | struct stat st;
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169 | int fd;
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170 |
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171 | fd = xopen(filename, O_RDONLY);
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172 | fstat(fd, &st);
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173 | image = NULL;
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174 | /* st.st_size is off_t, we can't just pass it to mmap */
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175 | if (st.st_size <= *image_size_p) {
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176 | size_t image_size = st.st_size;
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177 | image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0);
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178 | if (image == MAP_FAILED) {
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179 | image = NULL;
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180 | } else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) {
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181 | /* No ELF signature. Compressed module? */
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182 | munmap(image, image_size);
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183 | image = NULL;
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184 | } else {
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185 | /* Success. Report the size */
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186 | *image_size_p = image_size;
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187 | }
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188 | }
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189 | close(fd);
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190 | return image;
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191 | }
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192 | #endif
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193 |
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194 | /* Return:
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195 | * 0 on success,
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196 | * -errno on open/read error,
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197 | * errno on init_module() error
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198 | */
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199 | int FAST_FUNC bb_init_module(const char *filename, const char *options)
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200 | {
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201 | size_t image_size;
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202 | char *image;
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203 | int rc;
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204 | bool mmaped;
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205 |
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206 | if (!options)
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207 | options = "";
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208 |
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209 | //TODO: audit bb_init_module_24 to match error code convention
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210 | #if ENABLE_FEATURE_2_4_MODULES
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211 | if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
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212 | return bb_init_module_24(filename, options);
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213 | #endif
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214 |
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215 | image_size = INT_MAX - 4095;
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216 | mmaped = 0;
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217 | image = try_to_mmap_module(filename, &image_size);
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218 | if (image) {
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219 | mmaped = 1;
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220 | } else {
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221 | errno = ENOMEM; /* may be changed by e.g. open errors below */
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222 | image = xmalloc_open_zipped_read_close(filename, &image_size);
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223 | if (!image)
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224 | return -errno;
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225 | }
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226 |
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227 | errno = 0;
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228 | init_module(image, image_size, options);
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229 | rc = errno;
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230 | if (mmaped)
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231 | munmap(image, image_size);
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232 | else
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233 | free(image);
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234 | return rc;
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235 | }
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236 |
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237 | int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
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238 | {
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239 | errno = 0;
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240 | delete_module(module, flags);
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241 | return errno;
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242 | }
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243 |
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244 | /* Note: not suitable for delete_module() errnos.
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245 | * For them, probably only EWOULDBLOCK needs explaining:
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246 | * "Other modules depend on us". So far we don't do such
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247 | * translation and don't use moderror() for removal errors.
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248 | */
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249 | const char* FAST_FUNC moderror(int err)
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250 | {
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251 | switch (err) {
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252 | case -1: /* btw: it's -EPERM */
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253 | return "no such module";
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254 | case ENOEXEC:
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255 | return "invalid module format";
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256 | case ENOENT:
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257 | return "unknown symbol in module, or unknown parameter";
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258 | case ESRCH:
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259 | return "module has wrong symbol version";
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260 | case ENOSYS:
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261 | return "kernel does not support requested operation";
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262 | }
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263 | if (err < 0) /* should always be */
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264 | err = -err;
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265 | return strerror(err);
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266 | }
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