source: branches/3.2/mindi-busybox/modutils/modprobe-small.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 24.7 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * simplified modprobe
4 *
5 * Copyright (c) 2008 Vladimir Dronnikov
6 * Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code)
7 *
8 * Licensed under GPLv2, see file LICENSE in this source tree.
9 */
10
11//applet:IF_MODPROBE_SMALL(APPLET(modprobe, BB_DIR_SBIN, BB_SUID_DROP))
12//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe))
13//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe))
14//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe))
15//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe))
16
17#include "libbb.h"
18/* After libbb.h, since it needs sys/types.h on some systems */
19#include <sys/utsname.h> /* uname() */
20#include <fnmatch.h>
21
22extern int init_module(void *module, unsigned long len, const char *options);
23extern int delete_module(const char *module, unsigned flags);
24extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
25
26
27#if 1
28# define dbg1_error_msg(...) ((void)0)
29# define dbg2_error_msg(...) ((void)0)
30#else
31# define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
32# define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
33#endif
34
35#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
36
37enum {
38    OPT_q = (1 << 0), /* be quiet */
39    OPT_r = (1 << 1), /* module removal instead of loading */
40};
41
42typedef struct module_info {
43    char *pathname;
44    char *aliases;
45    char *deps;
46} module_info;
47
48/*
49 * GLOBALS
50 */
51struct globals {
52    module_info *modinfo;
53    char *module_load_options;
54    smallint dep_bb_seen;
55    smallint wrote_dep_bb_ok;
56    unsigned module_count;
57    int module_found_idx;
58    unsigned stringbuf_idx;
59    unsigned stringbuf_size;
60    char *stringbuf; /* some modules have lots of stuff */
61    /* for example, drivers/media/video/saa7134/saa7134.ko */
62    /* therefore having a fixed biggish buffer is not wise */
63};
64#define G (*ptr_to_globals)
65#define modinfo             (G.modinfo            )
66#define dep_bb_seen         (G.dep_bb_seen        )
67#define wrote_dep_bb_ok     (G.wrote_dep_bb_ok    )
68#define module_count        (G.module_count       )
69#define module_found_idx    (G.module_found_idx   )
70#define module_load_options (G.module_load_options)
71#define stringbuf_idx       (G.stringbuf_idx      )
72#define stringbuf_size      (G.stringbuf_size     )
73#define stringbuf           (G.stringbuf          )
74#define INIT_G() do { \
75    SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
76} while (0)
77
78static void append(const char *s)
79{
80    unsigned len = strlen(s);
81    if (stringbuf_idx + len + 15 > stringbuf_size) {
82        stringbuf_size = stringbuf_idx + len + 127;
83        dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
84        stringbuf = xrealloc(stringbuf, stringbuf_size);
85    }
86    memcpy(stringbuf + stringbuf_idx, s, len);
87    stringbuf_idx += len;
88}
89
90static void appendc(char c)
91{
92    /* We appendc() only after append(), + 15 trick in append()
93     * makes it unnecessary to check for overflow here */
94    stringbuf[stringbuf_idx++] = c;
95}
96
97static void bksp(void)
98{
99    if (stringbuf_idx)
100        stringbuf_idx--;
101}
102
103static void reset_stringbuf(void)
104{
105    stringbuf_idx = 0;
106}
107
108static char* copy_stringbuf(void)
109{
110    char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
111    return memcpy(copy, stringbuf, stringbuf_idx);
112}
113
114static char* find_keyword(char *ptr, size_t len, const char *word)
115{
116    int wlen;
117
118    if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
119        return NULL;
120
121    wlen = strlen(word);
122    len -= wlen - 1;
123    while ((ssize_t)len > 0) {
124        char *old = ptr;
125        /* search for the first char in word */
126        ptr = memchr(ptr, *word, len);
127        if (ptr == NULL) /* no occurance left, done */
128            break;
129        if (strncmp(ptr, word, wlen) == 0)
130            return ptr + wlen; /* found, return ptr past it */
131        ++ptr;
132        len -= (ptr - old);
133    }
134    return NULL;
135}
136
137static void replace(char *s, char what, char with)
138{
139    while (*s) {
140        if (what == *s)
141            *s = with;
142        ++s;
143    }
144}
145
146/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
147static char* str_2_list(const char *str)
148{
149    int len = strlen(str) + 1;
150    char *dst = xmalloc(len + 1);
151
152    dst[len] = '\0';
153    memcpy(dst, str, len);
154//TODO: protect against 2+ spaces: "word  word"
155    replace(dst, ' ', '\0');
156    return dst;
157}
158
159/* We use error numbers in a loose translation... */
160static const char *moderror(int err)
161{
162    switch (err) {
163    case ENOEXEC:
164        return "invalid module format";
165    case ENOENT:
166        return "unknown symbol in module or invalid parameter";
167    case ESRCH:
168        return "module has wrong symbol version";
169    case EINVAL: /* "invalid parameter" */
170        return "unknown symbol in module or invalid parameter"
171        + sizeof("unknown symbol in module or");
172    default:
173        return strerror(err);
174    }
175}
176
177static int load_module(const char *fname, const char *options)
178{
179#if 1
180    int r;
181    size_t len = MAXINT(ssize_t);
182    char *module_image;
183    dbg1_error_msg("load_module('%s','%s')", fname, options);
184
185    module_image = xmalloc_open_zipped_read_close(fname, &len);
186    r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
187    free(module_image);
188    dbg1_error_msg("load_module:%d", r);
189    return r; /* 0 = success */
190#else
191    /* For testing */
192    dbg1_error_msg("load_module('%s','%s')", fname, options);
193    return 1;
194#endif
195}
196
197static void parse_module(module_info *info, const char *pathname)
198{
199    char *module_image;
200    char *ptr;
201    size_t len;
202    size_t pos;
203    dbg1_error_msg("parse_module('%s')", pathname);
204
205    /* Read (possibly compressed) module */
206    len = 64 * 1024 * 1024; /* 64 Mb at most */
207    module_image = xmalloc_open_zipped_read_close(pathname, &len);
208    /* module_image == NULL is ok here, find_keyword handles it */
209//TODO: optimize redundant module body reads
210
211    /* "alias1 symbol:sym1 alias2 symbol:sym2" */
212    reset_stringbuf();
213    pos = 0;
214    while (1) {
215        ptr = find_keyword(module_image + pos, len - pos, "alias=");
216        if (!ptr) {
217            ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
218            if (!ptr)
219                break;
220            /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
221             * in many modules. What do they mean? */
222            if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
223                goto skip;
224            dbg2_error_msg("alias:'symbol:%s'", ptr);
225            append("symbol:");
226        } else {
227            dbg2_error_msg("alias:'%s'", ptr);
228        }
229        append(ptr);
230        appendc(' ');
231 skip:
232        pos = (ptr - module_image);
233    }
234    bksp(); /* remove last ' ' */
235    info->aliases = copy_stringbuf();
236    replace(info->aliases, '-', '_');
237
238    /* "dependency1 depandency2" */
239    reset_stringbuf();
240    ptr = find_keyword(module_image, len, "depends=");
241    if (ptr && *ptr) {
242        replace(ptr, ',', ' ');
243        replace(ptr, '-', '_');
244        dbg2_error_msg("dep:'%s'", ptr);
245        append(ptr);
246    }
247    info->deps = copy_stringbuf();
248
249    free(module_image);
250}
251
252static int pathname_matches_modname(const char *pathname, const char *modname)
253{
254    const char *fname = bb_get_last_path_component_nostrip(pathname);
255    const char *suffix = strrstr(fname, ".ko");
256//TODO: can do without malloc?
257    char *name = xstrndup(fname, suffix - fname);
258    int r;
259    replace(name, '-', '_');
260    r = (strcmp(name, modname) == 0);
261    free(name);
262    return r;
263}
264
265static FAST_FUNC int fileAction(const char *pathname,
266        struct stat *sb UNUSED_PARAM,
267        void *modname_to_match,
268        int depth UNUSED_PARAM)
269{
270    int cur;
271    const char *fname;
272
273    pathname += 2; /* skip "./" */
274    fname = bb_get_last_path_component_nostrip(pathname);
275    if (!strrstr(fname, ".ko")) {
276        dbg1_error_msg("'%s' is not a module", pathname);
277        return TRUE; /* not a module, continue search */
278    }
279
280    cur = module_count++;
281    modinfo = xrealloc_vector(modinfo, 12, cur);
282    modinfo[cur].pathname = xstrdup(pathname);
283    /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
284    /*modinfo[cur+1].pathname = NULL;*/
285
286    if (!pathname_matches_modname(fname, modname_to_match)) {
287        dbg1_error_msg("'%s' module name doesn't match", pathname);
288        return TRUE; /* module name doesn't match, continue search */
289    }
290
291    dbg1_error_msg("'%s' module name matches", pathname);
292    module_found_idx = cur;
293    parse_module(&modinfo[cur], pathname);
294
295    if (!(option_mask32 & OPT_r)) {
296        if (load_module(pathname, module_load_options) == 0) {
297            /* Load was successful, there is nothing else to do.
298             * This can happen ONLY for "top-level" module load,
299             * not a dep, because deps dont do dirscan. */
300            exit(EXIT_SUCCESS);
301        }
302    }
303
304    return TRUE;
305}
306
307static int load_dep_bb(void)
308{
309    char *line;
310    FILE *fp = fopen_for_read(DEPFILE_BB);
311
312    if (!fp)
313        return 0;
314
315    dep_bb_seen = 1;
316    dbg1_error_msg("loading "DEPFILE_BB);
317
318    /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
319     * we scanned the dir and found no module by name, then we search
320     * for alias (full scan), and we decided to generate modprobe.dep.bb.
321     * But we see modprobe.dep.bb.new! Other modprobe is at work!
322     * We wait and other modprobe renames it to modprobe.dep.bb.
323     * Now we can use it.
324     * But we already have modinfo[] filled, and "module_count = 0"
325     * makes us start anew. Yes, we leak modinfo[].xxx pointers -
326     * there is not much of data there anyway. */
327    module_count = 0;
328    memset(&modinfo[0], 0, sizeof(modinfo[0]));
329
330    while ((line = xmalloc_fgetline(fp)) != NULL) {
331        char* space;
332        char* linebuf;
333        int cur;
334
335        if (!line[0]) {
336            free(line);
337            continue;
338        }
339        space = strchrnul(line, ' ');
340        cur = module_count++;
341        modinfo = xrealloc_vector(modinfo, 12, cur);
342        /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
343        modinfo[cur].pathname = line; /* we take ownership of malloced block here */
344        if (*space)
345            *space++ = '\0';
346        modinfo[cur].aliases = space;
347        linebuf = xmalloc_fgetline(fp);
348        modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
349        if (modinfo[cur].deps[0]) {
350            /* deps are not "", so next line must be empty */
351            line = xmalloc_fgetline(fp);
352            /* Refuse to work with damaged config file */
353            if (line && line[0])
354                bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
355            free(line);
356        }
357    }
358    return 1;
359}
360
361static int start_dep_bb_writeout(void)
362{
363    int fd;
364
365    /* depmod -n: write result to stdout */
366    if (applet_name[0] == 'd' && (option_mask32 & 1))
367        return STDOUT_FILENO;
368
369    fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
370    if (fd < 0) {
371        if (errno == EEXIST) {
372            int count = 5 * 20;
373            dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
374            while (1) {
375                usleep(1000*1000 / 20);
376                if (load_dep_bb()) {
377                    dbg1_error_msg(DEPFILE_BB" appeared");
378                    return -2; /* magic number */
379                }
380                if (!--count)
381                    break;
382            }
383            bb_error_msg("deleting stale %s", DEPFILE_BB".new");
384            fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
385        }
386    }
387    dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
388    return fd;
389}
390
391static void write_out_dep_bb(int fd)
392{
393    int i;
394    FILE *fp;
395
396    /* We want good error reporting. fdprintf is not good enough. */
397    fp = xfdopen_for_write(fd);
398    i = 0;
399    while (modinfo[i].pathname) {
400        fprintf(fp, "%s%s%s\n" "%s%s\n",
401            modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
402            modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
403        i++;
404    }
405    /* Badly formatted depfile is a no-no. Be paranoid. */
406    errno = 0;
407    if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
408        goto err;
409
410    if (fd == STDOUT_FILENO) /* it was depmod -n */
411        goto ok;
412
413    if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
414 err:
415        bb_perror_msg("can't create '%s'", DEPFILE_BB);
416        unlink(DEPFILE_BB".new");
417    } else {
418 ok:
419        wrote_dep_bb_ok = 1;
420        dbg1_error_msg("created "DEPFILE_BB);
421    }
422}
423
424static module_info* find_alias(const char *alias)
425{
426    int i;
427    int dep_bb_fd;
428    module_info *result;
429    dbg1_error_msg("find_alias('%s')", alias);
430
431 try_again:
432    /* First try to find by name (cheaper) */
433    i = 0;
434    while (modinfo[i].pathname) {
435        if (pathname_matches_modname(modinfo[i].pathname, alias)) {
436            dbg1_error_msg("found '%s' in module '%s'",
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()
496static 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
524static 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
598        if (applet_name[0] == 'r') {
599            /* rmmod: do not remove dependencies, exit */
600            goto ret;
601        }
602
603        /* modprobe -r: we do not stop here -
604         * continue to unload modules on which the module depends:
605         * "-r --remove: option causes modprobe to remove a module.
606         * If the modules it depends on are also unused, modprobe
607         * will try to remove them, too."
608         */
609    }
610
611    if (!info) {
612        /* both dirscan and find_alias found nothing */
613        if (!is_rmmod && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
614            bb_error_msg("module '%s' not found", name);
615//TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
616        goto ret;
617    }
618
619    /* Iterate thru dependencies, trying to (un)load them */
620    deps = str_2_list(info->deps);
621    for (s = deps; *s; s += strlen(s) + 1) {
622        //if (strcmp(name, s) != 0) // N.B. do loops exist?
623        dbg1_error_msg("recurse on dep '%s'", s);
624        process_module(s, NULL);
625        dbg1_error_msg("recurse on dep '%s' done", s);
626    }
627    free(deps);
628
629    /* modprobe -> load it */
630    if (!is_rmmod) {
631        if (!options || strstr(options, "blacklist") == NULL) {
632            errno = 0;
633            if (load_module(info->pathname, options) != 0) {
634                if (EEXIST != errno) {
635                    bb_error_msg("'%s': %s",
636                        info->pathname,
637                        moderror(errno));
638                } else {
639                    dbg1_error_msg("'%s': %s",
640                        info->pathname,
641                        moderror(errno));
642                }
643            }
644        } else {
645            dbg1_error_msg("'%s': blacklisted", info->pathname);
646        }
647    }
648 ret:
649    free(options);
650//TODO: return load attempt result from process_module.
651//If dep didn't load ok, continuing makes little sense.
652}
653#undef cmdline_options
654
655
656/* For reference, module-init-tools v3.4 options:
657
658# insmod
659Usage: insmod filename [args]
660
661# rmmod --help
662Usage: rmmod [-fhswvV] modulename ...
663 -f (or --force) forces a module unload, and may crash your
664    machine. This requires the Forced Module Removal option
665    when the kernel was compiled.
666 -h (or --help) prints this help text
667 -s (or --syslog) says use syslog, not stderr
668 -v (or --verbose) enables more messages
669 -V (or --version) prints the version code
670 -w (or --wait) begins module removal even if it is used
671    and will stop new users from accessing the module (so it
672    should eventually fall to zero).
673
674# modprobe
675Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
676    [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
677modprobe -r [-n] [-i] [-v] <modulename> ...
678modprobe -l -t <dirname> [ -a <modulename> ...]
679
680# depmod --help
681depmod 3.4 -- part of module-init-tools
682depmod -[aA] [-n -e -v -q -V -r -u]
683      [-b basedirectory] [forced_version]
684depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
685If no arguments (except options) are given, "depmod -a" is assumed.
686depmod will output a dependency list suitable for the modprobe utility.
687Options:
688    -a, --all           Probe all modules
689    -A, --quick         Only does the work if there's a new module
690    -n, --show          Write the dependency file on stdout only
691    -e, --errsyms       Report not supplied symbols
692    -V, --version       Print the release version
693    -v, --verbose       Enable verbose mode
694    -h, --help          Print this usage message
695The following options are useful for people managing distributions:
696    -b basedirectory
697    --basedir basedirectory
698                        Use an image of a module tree
699    -F kernelsyms
700    --filesyms kernelsyms
701                        Use the file instead of the current kernel symbols
702*/
703
704//usage:#if ENABLE_MODPROBE_SMALL
705
706//// Note: currently, help system shows modprobe --help text for all aliased cmds
707//// (see APPLET_ODDNAME macro definition).
708//// All other help texts defined below are not used. FIXME?
709
710//usage:#define depmod_trivial_usage NOUSAGE_STR
711//usage:#define depmod_full_usage ""
712
713//usage:#define lsmod_trivial_usage
714//usage:       ""
715//usage:#define lsmod_full_usage "\n\n"
716//usage:       "List the currently loaded kernel modules"
717
718//usage:#define insmod_trivial_usage
719//usage:    IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
720//usage:    IF_NOT_FEATURE_2_4_MODULES("FILE ")
721//usage:    "[SYMBOL=VALUE]..."
722//usage:#define insmod_full_usage "\n\n"
723//usage:       "Load the specified kernel modules into the kernel"
724//usage:    IF_FEATURE_2_4_MODULES( "\n"
725//usage:     "\n    -f  Force module to load into the wrong kernel version"
726//usage:     "\n    -k  Make module autoclean-able"
727//usage:     "\n    -v  Verbose"
728//usage:     "\n    -q  Quiet"
729//usage:     "\n    -L  Lock: prevent simultaneous loads"
730//usage:    IF_FEATURE_INSMOD_LOAD_MAP(
731//usage:     "\n    -m  Output load map to stdout"
732//usage:    )
733//usage:     "\n    -x  Don't export externs"
734//usage:    )
735
736//usage:#define rmmod_trivial_usage
737//usage:       "[-wfa] [MODULE]..."
738//usage:#define rmmod_full_usage "\n\n"
739//usage:       "Unload kernel modules\n"
740//usage:     "\n    -w  Wait until the module is no longer used"
741//usage:     "\n    -f  Force unload"
742//usage:     "\n    -a  Remove all unused modules (recursively)"
743//usage:
744//usage:#define rmmod_example_usage
745//usage:       "$ rmmod tulip\n"
746
747//usage:#define modprobe_trivial_usage
748//usage:    "[-qfwrsv] MODULE [symbol=value]..."
749//usage:#define modprobe_full_usage "\n\n"
750//usage:       "    -r  Remove MODULE (stacks) or do autoclean"
751//usage:     "\n    -q  Quiet"
752//usage:     "\n    -v  Verbose"
753//usage:     "\n    -f  Force"
754//usage:     "\n    -w  Wait for unload"
755//usage:     "\n    -s  Report via syslog instead of stderr"
756
757//usage:#endif
758
759int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
760int modprobe_main(int argc UNUSED_PARAM, char **argv)
761{
762    struct utsname uts;
763    char applet0 = applet_name[0];
764    IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
765
766    /* are we lsmod? -> just dump /proc/modules */
767    if ('l' == applet0) {
768        xprint_and_close_file(xfopen_for_read("/proc/modules"));
769        return EXIT_SUCCESS;
770    }
771
772    INIT_G();
773
774    /* Prevent ugly corner cases with no modules at all */
775    modinfo = xzalloc(sizeof(modinfo[0]));
776
777    if ('i' != applet0) { /* not insmod */
778        /* Goto modules directory */
779        xchdir(CONFIG_DEFAULT_MODULES_DIR);
780    }
781    uname(&uts); /* never fails */
782
783    /* depmod? */
784    if ('d' == applet0) {
785        /* Supported:
786         * -n: print result to stdout
787         * -a: process all modules (default)
788         * optional VERSION parameter
789         * Ignored:
790         * -A: do work only if a module is newer than depfile
791         * -e: report any symbols which a module needs
792         *  which are not supplied by other modules or the kernel
793         * -F FILE: System.map (symbols for -e)
794         * -q, -r, -u: noop?
795         * Not supported:
796         * -b BASEDIR: (TODO!) modules are in
797         *  $BASEDIR/lib/modules/$VERSION
798         * -v: human readable deps to stdout
799         * -V: version (don't want to support it - people may depend
800         *  on it as an indicator of "standard" depmod)
801         * -h: help (well duh)
802         * module1.o module2.o parameters (just ignored for now)
803         */
804        getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
805        argv += optind;
806        /* if (argv[0] && argv[1]) bb_show_usage(); */
807        /* Goto $VERSION directory */
808        xchdir(argv[0] ? argv[0] : uts.release);
809        /* Force full module scan by asking to find a bogus module.
810         * This will generate modules.dep.bb as a side effect. */
811        process_module((char*)"/", NULL);
812        return !wrote_dep_bb_ok;
813    }
814
815    /* insmod, modprobe, rmmod require at least one argument */
816    opt_complementary = "-1";
817    /* only -q (quiet) and -r (rmmod),
818     * the rest are accepted and ignored (compat) */
819    getopt32(argv, "qrfsvwb");
820    argv += optind;
821
822    /* are we rmmod? -> simulate modprobe -r */
823    if ('r' == applet0) {
824        option_mask32 |= OPT_r;
825    }
826
827    if ('i' != applet0) { /* not insmod */
828        /* Goto $VERSION directory */
829        xchdir(uts.release);
830    }
831
832#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
833    /* If not rmmod, parse possible module options given on command line.
834     * insmod/modprobe takes one module name, the rest are parameters. */
835    options = NULL;
836    if ('r' != applet0) {
837        char **arg = argv;
838        while (*++arg) {
839            /* Enclose options in quotes */
840            char *s = options;
841            options = xasprintf("%s \"%s\"", s ? s : "", *arg);
842            free(s);
843            *arg = NULL;
844        }
845    }
846#else
847    if ('r' != applet0)
848        argv[1] = NULL;
849#endif
850
851    if ('i' == applet0) { /* insmod */
852        size_t len;
853        void *map;
854
855        len = MAXINT(ssize_t);
856        map = xmalloc_open_zipped_read_close(*argv, &len);
857        if (!map)
858            bb_perror_msg_and_die("can't read '%s'", *argv);
859        if (init_module(map, len,
860            IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
861            IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
862            ) != 0
863        ) {
864            bb_error_msg_and_die("can't insert '%s': %s",
865                    *argv, moderror(errno));
866        }
867        return 0;
868    }
869
870    /* Try to load modprobe.dep.bb */
871    load_dep_bb();
872
873    /* Load/remove modules.
874     * Only rmmod loops here, modprobe has only argv[0] */
875    do {
876        process_module(*argv, options);
877    } while (*++argv);
878
879    if (ENABLE_FEATURE_CLEAN_UP) {
880        IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
881    }
882    return EXIT_SUCCESS;
883}
Note: See TracBrowser for help on using the repository browser.