[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * depmod - generate modules.dep
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| 4 | * Copyright (c) 2008 Bernhard Reutner-Fischer
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| 5 | * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
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| 6 | * Copyright (c) 2008 Vladimir Dronnikov
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 9 | */
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| 10 |
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| 11 | //applet:IF_DEPMOD(APPLET(depmod, _BB_DIR_SBIN, _BB_SUID_DROP))
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| 12 |
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| 13 | //usage:#if !ENABLE_MODPROBE_SMALL
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| 14 | //usage:#define depmod_trivial_usage NOUSAGE_STR
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| 15 | //usage:#define depmod_full_usage ""
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| 16 | //usage:#endif
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| 17 |
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| 18 | #include "libbb.h"
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| 19 | #include "modutils.h"
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| 20 | #include <sys/utsname.h> /* uname() */
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| 21 |
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| 22 | /*
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| 23 | * Theory of operation:
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| 24 | * - iterate over all modules and record their full path
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| 25 | * - iterate over all modules looking for "depends=" entries
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| 26 | * for each depends, look through our list of full paths and emit if found
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| 27 | */
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| 28 |
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| 29 | typedef struct module_info {
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| 30 | struct module_info *next;
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| 31 | char *name, *modname;
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| 32 | llist_t *dependencies;
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| 33 | llist_t *aliases;
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| 34 | llist_t *symbols;
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| 35 | struct module_info *dnext, *dprev;
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| 36 | } module_info;
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| 37 |
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| 38 | static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
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| 39 | void *data, int depth UNUSED_PARAM)
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| 40 | {
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| 41 | char modname[MODULE_NAME_LEN];
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| 42 | module_info **first = (module_info **) data;
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| 43 | char *image, *ptr;
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| 44 | module_info *info;
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| 45 | /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
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| 46 | size_t len = (64*1024*1024 - 4096);
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| 47 |
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| 48 | if (strrstr(fname, ".ko") == NULL)
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| 49 | return TRUE;
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| 50 |
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| 51 | image = xmalloc_open_zipped_read_close(fname, &len);
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| 52 | info = xzalloc(sizeof(*info));
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| 53 |
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| 54 | info->next = *first;
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| 55 | *first = info;
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| 56 |
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| 57 | info->dnext = info->dprev = info;
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| 58 | info->name = xstrdup(fname + 2); /* skip "./" */
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| 59 | info->modname = xstrdup(filename2modname(fname, modname));
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| 60 | for (ptr = image; ptr < image + len - 10; ptr++) {
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| 61 | if (strncmp(ptr, "depends=", 8) == 0) {
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| 62 | char *u;
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| 63 |
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| 64 | ptr += 8;
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| 65 | for (u = ptr; *u; u++)
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| 66 | if (*u == '-')
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| 67 | *u = '_';
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| 68 | ptr += string_to_llist(ptr, &info->dependencies, ",");
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| 69 | } else if (ENABLE_FEATURE_MODUTILS_ALIAS
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| 70 | && strncmp(ptr, "alias=", 6) == 0
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| 71 | ) {
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| 72 | llist_add_to(&info->aliases, xstrdup(ptr + 6));
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| 73 | ptr += strlen(ptr);
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| 74 | } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
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| 75 | && strncmp(ptr, "__ksymtab_", 10) == 0
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| 76 | ) {
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| 77 | ptr += 10;
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| 78 | if (strncmp(ptr, "gpl", 3) == 0
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| 79 | || strcmp(ptr, "strings") == 0
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| 80 | ) {
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| 81 | continue;
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| 82 | }
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| 83 | llist_add_to(&info->symbols, xstrdup(ptr));
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| 84 | ptr += strlen(ptr);
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| 85 | }
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| 86 | }
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| 87 | free(image);
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| 88 |
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| 89 | return TRUE;
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| 90 | }
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| 91 |
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| 92 | static module_info *find_module(module_info *modules, const char *modname)
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| 93 | {
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| 94 | module_info *m;
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| 95 |
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| 96 | for (m = modules; m != NULL; m = m->next)
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| 97 | if (strcmp(m->modname, modname) == 0)
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| 98 | return m;
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| 99 | return NULL;
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| 100 | }
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| 101 |
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| 102 | static void order_dep_list(module_info *modules, module_info *start,
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| 103 | llist_t *add)
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| 104 | {
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| 105 | module_info *m;
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| 106 | llist_t *n;
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| 107 |
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| 108 | for (n = add; n != NULL; n = n->link) {
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| 109 | m = find_module(modules, n->data);
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| 110 | if (m == NULL)
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| 111 | continue;
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| 112 |
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| 113 | /* unlink current entry */
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| 114 | m->dnext->dprev = m->dprev;
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| 115 | m->dprev->dnext = m->dnext;
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| 116 |
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| 117 | /* and add it to tail */
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| 118 | m->dnext = start;
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| 119 | m->dprev = start->dprev;
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| 120 | start->dprev->dnext = m;
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| 121 | start->dprev = m;
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| 122 |
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| 123 | /* recurse */
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| 124 | order_dep_list(modules, start, m->dependencies);
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| 125 | }
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| 126 | }
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| 127 |
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| 128 | static void xfreopen_write(const char *file, FILE *f)
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| 129 | {
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| 130 | if (freopen(file, "w", f) == NULL)
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| 131 | bb_perror_msg_and_die("can't open '%s'", file);
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| 132 | }
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| 133 |
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| 134 | /* Usage:
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| 135 | * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
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| 136 | * -a --all
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| 137 | * Probe all modules. Default if no MODFILES.
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| 138 | * -A --quick
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| 139 | * Check modules.dep's mtime against module files' mtimes.
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| 140 | * -b --basedir BASE
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| 141 | * Use $BASE/lib/modules/VERSION
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| 142 | * -C --config FILE or DIR
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| 143 | * Path to /etc/depmod.conf or /etc/depmod.d/
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| 144 | * -e --errsyms
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| 145 | * When combined with the -F option, this reports any symbols which
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| 146 | * which are not supplied by other modules or kernel.
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| 147 | * -F --filesyms System.map
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| 148 | * -n --dry-run
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| 149 | * Print modules.dep etc to standard output
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| 150 | * -v --verbose
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| 151 | * Print to stdout all the symbols each module depends on
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| 152 | * and the module's file name which provides that symbol.
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| 153 | * -r No-op
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| 154 | * -u No-op
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| 155 | * -q No-op
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| 156 | *
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| 157 | * So far we only support: [-rn] [-b BASE] [VERSION] [MODFILES]...
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| 158 | * -aAeF are accepted but ignored. -vC are not accepted.
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| 159 | */
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| 160 | enum {
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| 161 | //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
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| 162 | //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
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| 163 | OPT_b = (1 << 2), /* base directory when modules are in staging area */
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| 164 | //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
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| 165 | //OPT_F = (1 << 4), /* System.map that contains the symbols */
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| 166 | OPT_n = (1 << 5), /* dry-run, print to stdout only */
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| 167 | OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
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| 168 | OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
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| 169 | OPT_q = (1 << 8), /* -q,--quiet: ignored */
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| 170 | OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
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| 171 | };
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| 172 |
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| 173 | int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 174 | int depmod_main(int argc UNUSED_PARAM, char **argv)
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| 175 | {
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| 176 | module_info *modules, *m, *dep;
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| 177 | const char *moddir_base = "/";
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| 178 | char *moddir, *version;
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| 179 | struct utsname uts;
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| 180 | int tmp;
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| 181 |
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| 182 | getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
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| 183 | argv += optind;
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| 184 |
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| 185 | /* goto modules location */
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| 186 | xchdir(moddir_base);
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| 187 |
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| 188 | /* If a version is provided, then that kernel version's module directory
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| 189 | * is used, rather than the current kernel version (as returned by
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| 190 | * "uname -r"). */
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| 191 | if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
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| 192 | version = *argv++;
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| 193 | } else {
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| 194 | uname(&uts);
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| 195 | version = uts.release;
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| 196 | }
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| 197 | moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
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| 198 | xchdir(moddir);
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| 199 | if (ENABLE_FEATURE_CLEAN_UP)
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| 200 | free(moddir);
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| 201 |
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| 202 | /* Scan modules */
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| 203 | modules = NULL;
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| 204 | if (*argv) {
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| 205 | do {
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| 206 | parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
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| 207 | } while (*++argv);
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| 208 | } else {
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| 209 | recursive_action(".", ACTION_RECURSE,
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| 210 | parse_module, NULL, &modules, 0);
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| 211 | }
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| 212 |
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| 213 | /* Generate dependency and alias files */
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| 214 | if (!(option_mask32 & OPT_n))
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| 215 | xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
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| 216 | for (m = modules; m != NULL; m = m->next) {
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| 217 | printf("%s:", m->name);
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| 218 |
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| 219 | order_dep_list(modules, m, m->dependencies);
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| 220 | while (m->dnext != m) {
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| 221 | dep = m->dnext;
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| 222 | printf(" %s", dep->name);
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| 223 |
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| 224 | /* unlink current entry */
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| 225 | dep->dnext->dprev = dep->dprev;
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| 226 | dep->dprev->dnext = dep->dnext;
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| 227 | dep->dnext = dep->dprev = dep;
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| 228 | }
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| 229 | bb_putchar('\n');
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| 230 | }
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| 231 |
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| 232 | #if ENABLE_FEATURE_MODUTILS_ALIAS
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| 233 | if (!(option_mask32 & OPT_n))
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| 234 | xfreopen_write("modules.alias", stdout);
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| 235 | for (m = modules; m != NULL; m = m->next) {
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| 236 | const char *fname = bb_basename(m->name);
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| 237 | int fnlen = strchrnul(fname, '.') - fname;
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| 238 | while (m->aliases) {
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| 239 | /* Last word can well be m->modname instead,
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| 240 | * but depmod from module-init-tools 3.4
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| 241 | * uses module basename, i.e., no s/-/_/g.
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| 242 | * (pathname and .ko.* are still stripped)
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| 243 | * Mimicking that... */
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| 244 | printf("alias %s %.*s\n",
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| 245 | (char*)llist_pop(&m->aliases),
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| 246 | fnlen, fname);
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| 247 | }
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| 248 | }
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| 249 | #endif
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| 250 | #if ENABLE_FEATURE_MODUTILS_SYMBOLS
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| 251 | if (!(option_mask32 & OPT_n))
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| 252 | xfreopen_write("modules.symbols", stdout);
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| 253 | for (m = modules; m != NULL; m = m->next) {
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| 254 | const char *fname = bb_basename(m->name);
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| 255 | int fnlen = strchrnul(fname, '.') - fname;
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| 256 | while (m->symbols) {
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| 257 | printf("alias symbol:%s %.*s\n",
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| 258 | (char*)llist_pop(&m->symbols),
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| 259 | fnlen, fname);
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| 260 | }
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| 261 | }
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| 262 | #endif
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| 263 |
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| 264 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 265 | while (modules) {
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| 266 | module_info *old = modules;
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| 267 | modules = modules->next;
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| 268 | free(old->name);
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| 269 | free(old->modname);
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| 270 | free(old);
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| 271 | }
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| 272 | }
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| 273 |
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| 274 | return EXIT_SUCCESS;
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| 275 | }
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