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path: root/modutils/depmod.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * depmod - generate modules.dep
4 * Copyright (c) 2008 Bernhard Reutner-Fischer
5 * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
6 * Copyright (c) 2008 Vladimir Dronnikov
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
10//config:config DEPMOD
11//config: bool "depmod"
12//config: default y
13//config: select PLATFORM_LINUX
14//config: help
15//config: depmod generates modules.dep (and potentially modules.alias
16//config: and modules.symbols) that contain dependency information
17//config: for modprobe.
18
19//applet:IF_DEPMOD(IF_NOT_MODPROBE_SMALL(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP)))
20
21//kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
22//kbuild:lib-$(CONFIG_DEPMOD) += depmod.o modutils.o
23//kbuild:endif
24
25#include "libbb.h"
26#include "modutils.h"
27#include <sys/utsname.h> /* uname() */
28
29/*
30 * Theory of operation:
31 * - iterate over all modules and record their full path
32 * - iterate over all modules looking for "depends=" entries
33 * for each depends, look through our list of full paths and emit if found
34 */
35
36static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
37 void *data, int depth UNUSED_PARAM)
38{
39 module_db *modules = data;
40 char *image, *ptr;
41 module_entry *e;
42
43 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
44 size_t len = (64*1024*1024 - 4096);
45
46 if (strrstr(fname, ".ko") == NULL)
47 return TRUE;
48
49 image = xmalloc_open_zipped_read_close(fname, &len);
50
51 e = moddb_get_or_create(modules, bb_get_last_path_component_nostrip(fname));
52 e->name = xstrdup(fname + 2); /* skip "./" */
53
54 for (ptr = image; ptr < image + len - 10; ptr++) {
55 if (is_prefixed_with(ptr, "depends=")) {
56 char *u;
57
58 ptr += 8;
59 for (u = ptr; *u; u++)
60 if (*u == '-')
61 *u = '_';
62 ptr += string_to_llist(ptr, &e->deps, ",");
63 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
64 && is_prefixed_with(ptr, "alias=")
65 ) {
66 llist_add_to(&e->aliases, xstrdup(ptr + 6));
67 ptr += strlen(ptr);
68 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
69 && is_prefixed_with(ptr, "__ksymtab_")
70 ) {
71 ptr += 10;
72 if (is_prefixed_with(ptr, "gpl")
73 || strcmp(ptr, "strings") == 0
74 ) {
75 continue;
76 }
77 llist_add_to(&e->symbols, xstrdup(ptr));
78 ptr += strlen(ptr);
79 }
80 }
81 free(image);
82
83 return TRUE;
84}
85
86static void order_dep_list(module_db *modules, module_entry *start, llist_t *add)
87{
88 module_entry *m;
89 llist_t *n;
90
91 for (n = add; n != NULL; n = n->link) {
92 m = moddb_get(modules, n->data);
93 if (m == NULL)
94 continue;
95
96 /* unlink current entry */
97 m->dnext->dprev = m->dprev;
98 m->dprev->dnext = m->dnext;
99
100 /* and add it to tail */
101 m->dnext = start;
102 m->dprev = start->dprev;
103 start->dprev->dnext = m;
104 start->dprev = m;
105
106 /* recurse */
107 order_dep_list(modules, start, m->deps);
108 }
109}
110
111static void xfreopen_write(const char *file, FILE *f)
112{
113 if (freopen(file, "w", f) == NULL)
114 bb_perror_msg_and_die("can't open '%s'", file);
115}
116
117//usage:#if !ENABLE_MODPROBE_SMALL
118//usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
119//usage:#define depmod_full_usage "\n\n"
120//usage: "Generate modules.dep, alias, and symbols files"
121//usage: "\n"
122//usage: "\n -b BASE Use BASE/lib/modules/VERSION"
123//usage: "\n -n Dry run: print files to stdout"
124//usage:#endif
125
126/* Upstream usage:
127 * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
128 * -a --all
129 * Probe all modules. Default if no MODFILES.
130 * -A --quick
131 * Check modules.dep's mtime against module files' mtimes.
132 * -b --basedir BASE
133 * Use $BASE/lib/modules/VERSION
134 * -C --config FILE or DIR
135 * Path to /etc/depmod.conf or /etc/depmod.d/
136 * -e --errsyms
137 * When combined with the -F option, this reports any symbols
138 * which are not supplied by other modules or kernel.
139 * -F --filesyms System.map
140 * -n --dry-run
141 * Print modules.dep etc to standard output
142 * -v --verbose
143 * Print to stdout all the symbols each module depends on
144 * and the module's file name which provides that symbol.
145 * -r No-op
146 * -u No-op
147 * -q No-op
148 *
149 * So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]...
150 * Accepted but ignored:
151 * -aAe
152 * -F System.map
153 * -C FILE/DIR
154 *
155 * Not accepted: -v
156 */
157enum {
158 //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
159 //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
160 OPT_b = (1 << 2), /* base directory when modules are in staging area */
161 //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
162 //OPT_F = (1 << 4), /* System.map that contains the symbols */
163 OPT_n = (1 << 5), /* dry-run, print to stdout only */
164 OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
165 OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
166 OPT_q = (1 << 8), /* -q,--quiet: ignored */
167 OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
168};
169
170int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
171int depmod_main(int argc UNUSED_PARAM, char **argv)
172{
173 module_db modules;
174 module_entry *m, *dep;
175 const char *moddir_base = "/";
176 char *moddir, *version;
177 struct utsname uts;
178 unsigned i;
179 int tmp;
180
181 getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
182 argv += optind;
183
184 /* goto modules location */
185 xchdir(moddir_base);
186
187 /* If a version is provided, then that kernel version's module directory
188 * is used, rather than the current kernel version (as returned by
189 * "uname -r"). */
190 if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
191 version = *argv++;
192 } else {
193 uname(&uts);
194 version = uts.release;
195 }
196 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
197 xchdir(moddir);
198 if (ENABLE_FEATURE_CLEAN_UP)
199 free(moddir);
200
201 /* Scan modules */
202 memset(&modules, 0, sizeof(modules));
203 if (*argv) {
204 do {
205 parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
206 } while (*++argv);
207 } else {
208 recursive_action(".", ACTION_RECURSE,
209 parse_module, NULL, &modules, 0);
210 }
211
212 /* Generate dependency and alias files */
213 if (!(option_mask32 & OPT_n))
214 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
215
216 moddb_foreach_module(&modules, m, i) {
217 printf("%s:", m->name);
218
219 order_dep_list(&modules, m, m->deps);
220 while (m->dnext != m) {
221 dep = m->dnext;
222 printf(" %s", dep->name);
223
224 /* unlink current entry */
225 dep->dnext->dprev = dep->dprev;
226 dep->dprev->dnext = dep->dnext;
227 dep->dnext = dep->dprev = dep;
228 }
229 bb_putchar('\n');
230 }
231
232#if ENABLE_FEATURE_MODUTILS_ALIAS
233 if (!(option_mask32 & OPT_n))
234 xfreopen_write("modules.alias", stdout);
235 moddb_foreach_module(&modules, m, i) {
236 while (m->aliases) {
237 /*
238 * Last word used to be a basename
239 * (filename with path and .ko.* stripped)
240 * at the time of module-init-tools 3.4.
241 * kmod v.12 uses module name, i.e., s/-/_/g.
242 */
243 printf("alias %s %s\n",
244 (char*)llist_pop(&m->aliases),
245 m->modname);
246 }
247 }
248#endif
249#if ENABLE_FEATURE_MODUTILS_SYMBOLS
250 if (!(option_mask32 & OPT_n))
251 xfreopen_write("modules.symbols", stdout);
252 moddb_foreach_module(&modules, m, i) {
253 while (m->symbols) {
254 printf("alias symbol:%s %s\n",
255 (char*)llist_pop(&m->symbols),
256 m->modname);
257 }
258 }
259#endif
260
261 if (ENABLE_FEATURE_CLEAN_UP)
262 moddb_free(&modules);
263
264 return EXIT_SUCCESS;
265}
266
generated by cgit at 2024-05-14 09:12:28 (GMT)