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 tarball for details. 9 */ 10 11#include "libbb.h" 12/* After libbb.h, since it needs sys/types.h on some systems */ 13#include <sys/utsname.h> /* uname() */ 14#include <fnmatch.h> 15 16extern int init_module(void *module, unsigned long len, const char *options); 17extern int delete_module(const char *module, unsigned flags); 18extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret); 19 20 21#define dbg1_error_msg(...) ((void)0) 22#define dbg2_error_msg(...) ((void)0) 23//#define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__) 24//#define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__) 25 26#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb" 27 28enum { 29 OPT_q = (1 << 0), /* be quiet */ 30 OPT_r = (1 << 1), /* module removal instead of loading */ 31}; 32 33typedef struct module_info { 34 char *pathname; 35 char *aliases; 36 char *deps; 37} module_info; 38 39/* 40 * GLOBALS 41 */ 42struct globals { 43 module_info *modinfo; 44 char *module_load_options; 45 smallint dep_bb_seen; 46 smallint wrote_dep_bb_ok; 47 unsigned module_count; 48 int module_found_idx; 49 unsigned stringbuf_idx; 50 unsigned stringbuf_size; 51 char *stringbuf; /* some modules have lots of stuff */ 52 /* for example, drivers/media/video/saa7134/saa7134.ko */ 53 /* therefore having a fixed biggish buffer is not wise */ 54}; 55#define G (*ptr_to_globals) 56#define modinfo (G.modinfo ) 57#define dep_bb_seen (G.dep_bb_seen ) 58#define wrote_dep_bb_ok (G.wrote_dep_bb_ok ) 59#define module_count (G.module_count ) 60#define module_found_idx (G.module_found_idx ) 61#define module_load_options (G.module_load_options) 62#define stringbuf_idx (G.stringbuf_idx ) 63#define stringbuf_size (G.stringbuf_size ) 64#define stringbuf (G.stringbuf ) 65#define INIT_G() do { \ 66 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ 67} while (0) 68 69static void append(const char *s) 70{ 71 unsigned len = strlen(s); 72 if (stringbuf_idx + len + 15 > stringbuf_size) { 73 stringbuf_size = stringbuf_idx + len + 127; 74 dbg2_error_msg("grow stringbuf to %u", stringbuf_size); 75 stringbuf = xrealloc(stringbuf, stringbuf_size); 76 } 77 memcpy(stringbuf + stringbuf_idx, s, len); 78 stringbuf_idx += len; 79} 80 81static void appendc(char c) 82{ 83 /* We appendc() only after append(), + 15 trick in append() 84 * makes it unnecessary to check for overflow here */ 85 stringbuf[stringbuf_idx++] = c; 86} 87 88static void bksp(void) 89{ 90 if (stringbuf_idx) 91 stringbuf_idx--; 92} 93 94static void reset_stringbuf(void) 95{ 96 stringbuf_idx = 0; 97} 98 99static char* copy_stringbuf(void) 100{ 101 char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */ 102 return memcpy(copy, stringbuf, stringbuf_idx); 103} 104 105static char* find_keyword(char *ptr, size_t len, const char *word) 106{ 107 int wlen; 108 109 if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */ 110 return NULL; 111 112 wlen = strlen(word); 113 len -= wlen - 1; 114 while ((ssize_t)len > 0) { 115 char *old = ptr; 116 /* search for the first char in word */ 117 ptr = memchr(ptr, *word, len); 118 if (ptr == NULL) /* no occurance left, done */ 119 break; 120 if (strncmp(ptr, word, wlen) == 0) 121 return ptr + wlen; /* found, return ptr past it */ 122 ++ptr; 123 len -= (ptr - old); 124 } 125 return NULL; 126} 127 128static void replace(char *s, char what, char with) 129{ 130 while (*s) { 131 if (what == *s) 132 *s = with; 133 ++s; 134 } 135} 136 137/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */ 138static char* str_2_list(const char *str) 139{ 140 int len = strlen(str) + 1; 141 char *dst = xmalloc(len + 1); 142 143 dst[len] = '\0'; 144 memcpy(dst, str, len); 145//TODO: protect against 2+ spaces: "word word" 146 replace(dst, ' ', '\0'); 147 return dst; 148} 149 150/* We use error numbers in a loose translation... */ 151static const char *moderror(int err) 152{ 153 switch (err) { 154 case ENOEXEC: 155 return "invalid module format"; 156 case ENOENT: 157 return "unknown symbol in module or invalid parameter"; 158 case ESRCH: 159 return "module has wrong symbol version"; 160 case EINVAL: /* "invalid parameter" */ 161 return "unknown symbol in module or invalid parameter" 162 + sizeof("unknown symbol in module or"); 163 default: 164 return strerror(err); 165 } 166} 167 168static int load_module(const char *fname, const char *options) 169{ 170#if 1 171 int r; 172 size_t len = MAXINT(ssize_t); 173 char *module_image; 174 dbg1_error_msg("load_module('%s','%s')", fname, options); 175 176 module_image = xmalloc_open_zipped_read_close(fname, &len); 177 r = (!module_image || init_module(module_image, len, options ? options : "") != 0); 178 free(module_image); 179 dbg1_error_msg("load_module:%d", r); 180 return r; /* 0 = success */ 181#else 182 /* For testing */ 183 dbg1_error_msg("load_module('%s','%s')", fname, options); 184 return 1; 185#endif 186} 187 188static void parse_module(module_info *info, const char *pathname) 189{ 190 char *module_image; 191 char *ptr; 192 size_t len; 193 size_t pos; 194 dbg1_error_msg("parse_module('%s')", pathname); 195 196 /* Read (possibly compressed) module */ 197 len = 64 * 1024 * 1024; /* 64 Mb at most */ 198 module_image = xmalloc_open_zipped_read_close(pathname, &len); 199//TODO: optimize redundant module body reads 200 201 /* "alias1 symbol:sym1 alias2 symbol:sym2" */ 202 reset_stringbuf(); 203 pos = 0; 204 while (1) { 205 ptr = find_keyword(module_image + pos, len - pos, "alias="); 206 if (!ptr) { 207 ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_"); 208 if (!ptr) 209 break; 210 /* DOCME: __ksymtab_gpl and __ksymtab_strings occur 211 * in many modules. What do they mean? */ 212 if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0) 213 goto skip; 214 dbg2_error_msg("alias:'symbol:%s'", ptr); 215 append("symbol:"); 216 } else { 217 dbg2_error_msg("alias:'%s'", ptr); 218 } 219 append(ptr); 220 appendc(' '); 221 skip: 222 pos = (ptr - module_image); 223 } 224 bksp(); /* remove last ' ' */ 225 info->aliases = copy_stringbuf(); 226 replace(info->aliases, '-', '_'); 227 228 /* "dependency1 depandency2" */ 229 reset_stringbuf(); 230 ptr = find_keyword(module_image, len, "depends="); 231 if (ptr && *ptr) { 232 replace(ptr, ',', ' '); 233 replace(ptr, '-', '_'); 234 dbg2_error_msg("dep:'%s'", ptr); 235 append(ptr); 236 } 237 info->deps = copy_stringbuf(); 238 239 free(module_image); 240} 241 242static int pathname_matches_modname(const char *pathname, const char *modname) 243{ 244 const char *fname = bb_get_last_path_component_nostrip(pathname); 245 const char *suffix = strrstr(fname, ".ko"); 246//TODO: can do without malloc? 247 char *name = xstrndup(fname, suffix - fname); 248 int r; 249 replace(name, '-', '_'); 250 r = (strcmp(name, modname) == 0); 251 free(name); 252 return r; 253} 254 255static FAST_FUNC int fileAction(const char *pathname, 256 struct stat *sb UNUSED_PARAM, 257 void *modname_to_match, 258 int depth UNUSED_PARAM) 259{ 260 int cur; 261 const char *fname; 262 263 pathname += 2; /* skip "./" */ 264 fname = bb_get_last_path_component_nostrip(pathname); 265 if (!strrstr(fname, ".ko")) { 266 dbg1_error_msg("'%s' is not a module", pathname); 267 return TRUE; /* not a module, continue search */ 268 } 269 270 cur = module_count++; 271 modinfo = xrealloc_vector(modinfo, 12, cur); 272 modinfo[cur].pathname = xstrdup(pathname); 273 /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */ 274 /*modinfo[cur+1].pathname = NULL;*/ 275 276 if (!pathname_matches_modname(fname, modname_to_match)) { 277 dbg1_error_msg("'%s' module name doesn't match", pathname); 278 return TRUE; /* module name doesn't match, continue search */ 279 } 280 281 dbg1_error_msg("'%s' module name matches", pathname); 282 module_found_idx = cur; 283 parse_module(&modinfo[cur], pathname); 284 285 if (!(option_mask32 & OPT_r)) { 286 if (load_module(pathname, module_load_options) == 0) { 287 /* Load was successful, there is nothing else to do. 288 * This can happen ONLY for "top-level" module load, 289 * not a dep, because deps dont do dirscan. */ 290 exit(EXIT_SUCCESS); 291 } 292 } 293 294 return TRUE; 295} 296 297static int load_dep_bb(void) 298{ 299 char *line; 300 FILE *fp = fopen_for_read(DEPFILE_BB); 301 302 if (!fp) 303 return 0; 304 305 dep_bb_seen = 1; 306 dbg1_error_msg("loading "DEPFILE_BB); 307 308 /* Why? There is a rare scenario: we did not find modprobe.dep.bb, 309 * we scanned the dir and found no module by name, then we search 310 * for alias (full scan), and we decided to generate modprobe.dep.bb. 311 * But we see modprobe.dep.bb.new! Other modprobe is at work! 312 * We wait and other modprobe renames it to modprobe.dep.bb. 313 * Now we can use it. 314 * But we already have modinfo[] filled, and "module_count = 0" 315 * makes us start anew. Yes, we leak modinfo[].xxx pointers - 316 * there is not much of data there anyway. */ 317 module_count = 0; 318 memset(&modinfo[0], 0, sizeof(modinfo[0])); 319 320 while ((line = xmalloc_fgetline(fp)) != NULL) { 321 char* space; 322 char* linebuf; 323 int cur; 324 325 if (!line[0]) { 326 free(line); 327 continue; 328 } 329 space = strchrnul(line, ' '); 330 cur = module_count++; 331 modinfo = xrealloc_vector(modinfo, 12, cur); 332 /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */ 333 modinfo[cur].pathname = line; /* we take ownership of malloced block here */ 334 if (*space) 335 *space++ = '\0'; 336 modinfo[cur].aliases = space; 337 linebuf = xmalloc_fgetline(fp); 338 modinfo[cur].deps = linebuf ? linebuf : xzalloc(1); 339 if (modinfo[cur].deps[0]) { 340 /* deps are not "", so next line must be empty */ 341 line = xmalloc_fgetline(fp); 342 /* Refuse to work with damaged config file */ 343 if (line && line[0]) 344 bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line); 345 free(line); 346 } 347 } 348 return 1; 349} 350 351static int start_dep_bb_writeout(void) 352{ 353 int fd; 354 355 /* depmod -n: write result to stdout */ 356 if (applet_name[0] == 'd' && (option_mask32 & 1)) 357 return STDOUT_FILENO; 358 359 fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644); 360 if (fd < 0) { 361 if (errno == EEXIST) { 362 int count = 5 * 20; 363 dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB); 364 while (1) { 365 usleep(1000*1000 / 20); 366 if (load_dep_bb()) { 367 dbg1_error_msg(DEPFILE_BB" appeared"); 368 return -2; /* magic number */ 369 } 370 if (!--count) 371 break; 372 } 373 bb_error_msg("deleting stale %s", DEPFILE_BB".new"); 374 fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC); 375 } 376 } 377 dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd); 378 return fd; 379} 380 381static void write_out_dep_bb(int fd) 382{ 383 int i; 384 FILE *fp; 385 386 /* We want good error reporting. fdprintf is not good enough. */ 387 fp = xfdopen_for_write(fd); 388 i = 0; 389 while (modinfo[i].pathname) { 390 fprintf(fp, "%s%s%s\n" "%s%s\n", 391 modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases, 392 modinfo[i].deps, modinfo[i].deps[0] ? "\n" : ""); 393 i++; 394 } 395 /* Badly formatted depfile is a no-no. Be paranoid. */ 396 errno = 0; 397 if (ferror(fp) | fclose(fp)) /* | instead of || is intended */ 398 goto err; 399 400 if (fd == STDOUT_FILENO) /* it was depmod -n */ 401 goto ok; 402 403 if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) { 404 err: 405 bb_perror_msg("can't create '%s'", DEPFILE_BB); 406 unlink(DEPFILE_BB".new"); 407 } else { 408 ok: 409 wrote_dep_bb_ok = 1; 410 dbg1_error_msg("created "DEPFILE_BB); 411 } 412} 413 414static module_info* find_alias(const char *alias) 415{ 416 int i; 417 int dep_bb_fd; 418 module_info *result; 419 dbg1_error_msg("find_alias('%s')", alias); 420 421 try_again: 422 /* First try to find by name (cheaper) */ 423 i = 0; 424 while (modinfo[i].pathname) { 425 if (pathname_matches_modname(modinfo[i].pathname, alias)) { 426 dbg1_error_msg("found '%s' in module '%s'", 427 alias, modinfo[i].pathname); 428 if (!modinfo[i].aliases) { 429 parse_module(&modinfo[i], modinfo[i].pathname); 430 } 431 return &modinfo[i]; 432 } 433 i++; 434 } 435 436 /* Ok, we definitely have to scan module bodies. This is a good 437 * moment to generate modprobe.dep.bb, if it does not exist yet */ 438 dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout(); 439 if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */ 440 goto try_again; 441 442 /* Scan all module bodies, extract modinfo (it contains aliases) */ 443 i = 0; 444 result = NULL; 445 while (modinfo[i].pathname) { 446 char *desc, *s; 447 if (!modinfo[i].aliases) { 448 parse_module(&modinfo[i], modinfo[i].pathname); 449 } 450 if (result) { 451 i++; 452 continue; 453 } 454 /* "alias1 symbol:sym1 alias2 symbol:sym2" */ 455 desc = str_2_list(modinfo[i].aliases); 456 /* Does matching substring exist? */ 457 for (s = desc; *s; s += strlen(s) + 1) { 458 /* Aliases in module bodies can be defined with 459 * shell patterns. Example: 460 * "pci:v000010DEd000000D9sv*sd*bc*sc*i*". 461 * Plain strcmp() won't catch that */ 462 if (fnmatch(s, alias, 0) == 0) { 463 dbg1_error_msg("found alias '%s' in module '%s'", 464 alias, modinfo[i].pathname); 465 result = &modinfo[i]; 466 break; 467 } 468 } 469 free(desc); 470 if (result && dep_bb_fd < 0) 471 return result; 472 i++; 473 } 474 475 /* Create module.dep.bb if needed */ 476 if (dep_bb_fd >= 0) { 477 write_out_dep_bb(dep_bb_fd); 478 } 479 480 dbg1_error_msg("find_alias '%s' returns %p", alias, result); 481 return result; 482} 483 484#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED 485// TODO: open only once, invent config_rewind() 486static int already_loaded(const char *name) 487{ 488 int ret = 0; 489 char *s; 490 parser_t *parser = config_open2("/proc/modules", xfopen_for_read); 491 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) { 492 if (strcmp(s, name) == 0) { 493 ret = 1; 494 break; 495 } 496 } 497 config_close(parser); 498 return ret; 499} 500#else 501#define already_loaded(name) is_rmmod 502#endif 503 504/* 505 * Given modules definition and module name (or alias, or symbol) 506 * load/remove the module respecting dependencies. 507 * NB: also called by depmod with bogus name "/", 508 * just in order to force modprobe.dep.bb creation. 509*/ 510#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE 511#define process_module(a,b) process_module(a) 512#define cmdline_options "" 513#endif 514static void process_module(char *name, const char *cmdline_options) 515{ 516 char *s, *deps, *options; 517 module_info *info; 518 int is_rmmod = (option_mask32 & OPT_r) != 0; 519 dbg1_error_msg("process_module('%s','%s')", name, cmdline_options); 520 521 replace(name, '-', '_'); 522 523 dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod); 524 if (already_loaded(name) != is_rmmod) { 525 dbg1_error_msg("nothing to do for '%s'", name); 526 return; 527 } 528 529 options = NULL; 530 if (!is_rmmod) { 531 char *opt_filename = xasprintf("/etc/modules/%s", name); 532 options = xmalloc_open_read_close(opt_filename, NULL); 533 if (options) 534 replace(options, '\n', ' '); 535#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE 536 if (cmdline_options) { 537 /* NB: cmdline_options always have one leading ' ' 538 * (see main()), we remove it here */ 539 char *op = xasprintf(options ? "%s %s" : "%s %s" + 3, 540 cmdline_options + 1, options); 541 free(options); 542 options = op; 543 } 544#endif 545 free(opt_filename); 546 module_load_options = options; 547 dbg1_error_msg("process_module('%s'): options:'%s'", name, options); 548 } 549 550 if (!module_count) { 551 /* Scan module directory. This is done only once. 552 * It will attempt module load, and will exit(EXIT_SUCCESS) 553 * on success. */ 554 module_found_idx = -1; 555 recursive_action(".", 556 ACTION_RECURSE, /* flags */ 557 fileAction, /* file action */ 558 NULL, /* dir action */ 559 name, /* user data */ 560 0); /* depth */ 561 dbg1_error_msg("dirscan complete"); 562 /* Module was not found, or load failed, or is_rmmod */ 563 if (module_found_idx >= 0) { /* module was found */ 564 info = &modinfo[module_found_idx]; 565 } else { /* search for alias, not a plain module name */ 566 info = find_alias(name); 567 } 568 } else { 569 info = find_alias(name); 570 } 571 572// Problem here: there can be more than one module 573// for the given alias. For example, 574// "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches 575// ata_piix because it has an alias "pci:v00008086d00007010sv*sd*bc*sc*i*" 576// and ata_generic, it has an alias "alias=pci:v*d*sv*sd*bc01sc01i*" 577// Standard modprobe would load them both. 578// In this code, find_alias() returns only the first matching module. 579 580 /* rmmod? unload it by name */ 581 if (is_rmmod) { 582 if (delete_module(name, O_NONBLOCK | O_EXCL) != 0 583 && !(option_mask32 & OPT_q) 584 ) { 585 bb_perror_msg("remove '%s'", name); 586 goto ret; 587 } 588 /* N.B. we do not stop here - 589 * continue to unload modules on which the module depends: 590 * "-r --remove: option causes modprobe to remove a module. 591 * If the modules it depends on are also unused, modprobe 592 * will try to remove them, too." */ 593 } 594 595 if (!info) { 596 /* both dirscan and find_alias found nothing */ 597 if (applet_name[0] != 'd') /* it wasn't depmod */ 598 bb_error_msg("module '%s' not found", name); 599//TODO: _and_die()? 600 goto ret; 601 } 602 603 /* Iterate thru dependencies, trying to (un)load them */ 604 deps = str_2_list(info->deps); 605 for (s = deps; *s; s += strlen(s) + 1) { 606 //if (strcmp(name, s) != 0) // N.B. do loops exist? 607 dbg1_error_msg("recurse on dep '%s'", s); 608 process_module(s, NULL); 609 dbg1_error_msg("recurse on dep '%s' done", s); 610 } 611 free(deps); 612 613 /* modprobe -> load it */ 614 if (!is_rmmod) { 615 if (!options || strstr(options, "blacklist") == NULL) { 616 errno = 0; 617 if (load_module(info->pathname, options) != 0) { 618 if (EEXIST != errno) { 619 bb_error_msg("'%s': %s", 620 info->pathname, 621 moderror(errno)); 622 } else { 623 dbg1_error_msg("'%s': %s", 624 info->pathname, 625 moderror(errno)); 626 } 627 } 628 } else { 629 dbg1_error_msg("'%s': blacklisted", info->pathname); 630 } 631 } 632 ret: 633 free(options); 634//TODO: return load attempt result from process_module. 635//If dep didn't load ok, continuing makes little sense. 636} 637#undef cmdline_options 638 639 640/* For reference, module-init-tools v3.4 options: 641 642# insmod 643Usage: insmod filename [args] 644 645# rmmod --help 646Usage: rmmod [-fhswvV] modulename ... 647 -f (or --force) forces a module unload, and may crash your 648 machine. This requires the Forced Module Removal option 649 when the kernel was compiled. 650 -h (or --help) prints this help text 651 -s (or --syslog) says use syslog, not stderr 652 -v (or --verbose) enables more messages 653 -V (or --version) prints the version code 654 -w (or --wait) begins module removal even if it is used 655 and will stop new users from accessing the module (so it 656 should eventually fall to zero). 657 658# modprobe 659Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b] 660 [-o <modname>] [ --dump-modversions ] <modname> [parameters...] 661modprobe -r [-n] [-i] [-v] <modulename> ... 662modprobe -l -t <dirname> [ -a <modulename> ...] 663 664# depmod --help 665depmod 3.4 -- part of module-init-tools 666depmod -[aA] [-n -e -v -q -V -r -u] 667 [-b basedirectory] [forced_version] 668depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ... 669If no arguments (except options) are given, "depmod -a" is assumed. 670depmod will output a dependency list suitable for the modprobe utility. 671Options: 672 -a, --all Probe all modules 673 -A, --quick Only does the work if there's a new module 674 -n, --show Write the dependency file on stdout only 675 -e, --errsyms Report not supplied symbols 676 -V, --version Print the release version 677 -v, --verbose Enable verbose mode 678 -h, --help Print this usage message 679The following options are useful for people managing distributions: 680 -b basedirectory 681 --basedir basedirectory 682 Use an image of a module tree 683 -F kernelsyms 684 --filesyms kernelsyms 685 Use the file instead of the current kernel symbols 686*/ 687 688//usage:#if ENABLE_MODPROBE_SMALL 689//usage:#define modprobe_trivial_usage 690//usage: "[-qfwrsv] MODULE [symbol=value]..." 691//usage:#define modprobe_full_usage "\n\n" 692//usage: "Options:" 693//usage: "\n -r Remove MODULE (stacks) or do autoclean" 694//usage: "\n -q Quiet" 695//usage: "\n -v Verbose" 696//usage: "\n -f Force" 697//usage: "\n -w Wait for unload" 698//usage: "\n -s Report via syslog instead of stderr" 699//usage:#endif /* ENABLE_MODPROBE_SMALL */ 700 701int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 702int modprobe_main(int argc UNUSED_PARAM, char **argv) 703{ 704 struct utsname uts; 705 char applet0 = applet_name[0]; 706 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;) 707 708 /* are we lsmod? -> just dump /proc/modules */ 709 if ('l' == applet0) { 710 xprint_and_close_file(xfopen_for_read("/proc/modules")); 711 return EXIT_SUCCESS; 712 } 713 714 INIT_G(); 715 716 /* Prevent ugly corner cases with no modules at all */ 717 modinfo = xzalloc(sizeof(modinfo[0])); 718 719 if ('i' != applet0) { /* not insmod */ 720 /* Goto modules directory */ 721 xchdir(CONFIG_DEFAULT_MODULES_DIR); 722 } 723 uname(&uts); /* never fails */ 724 725 /* depmod? */ 726 if ('d' == applet0) { 727 /* Supported: 728 * -n: print result to stdout 729 * -a: process all modules (default) 730 * optional VERSION parameter 731 * Ignored: 732 * -A: do work only if a module is newer than depfile 733 * -e: report any symbols which a module needs 734 * which are not supplied by other modules or the kernel 735 * -F FILE: System.map (symbols for -e) 736 * -q, -r, -u: noop? 737 * Not supported: 738 * -b BASEDIR: (TODO!) modules are in 739 * $BASEDIR/lib/modules/$VERSION 740 * -v: human readable deps to stdout 741 * -V: version (don't want to support it - people may depend 742 * on it as an indicator of "standard" depmod) 743 * -h: help (well duh) 744 * module1.o module2.o parameters (just ignored for now) 745 */ 746 getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL); 747 argv += optind; 748 /* if (argv[0] && argv[1]) bb_show_usage(); */ 749 /* Goto $VERSION directory */ 750 xchdir(argv[0] ? argv[0] : uts.release); 751 /* Force full module scan by asking to find a bogus module. 752 * This will generate modules.dep.bb as a side effect. */ 753 process_module((char*)"/", NULL); 754 return !wrote_dep_bb_ok; 755 } 756 757 /* insmod, modprobe, rmmod require at least one argument */ 758 opt_complementary = "-1"; 759 /* only -q (quiet) and -r (rmmod), 760 * the rest are accepted and ignored (compat) */ 761 getopt32(argv, "qrfsvw"); 762 argv += optind; 763 764 /* are we rmmod? -> simulate modprobe -r */ 765 if ('r' == applet0) { 766 option_mask32 |= OPT_r; 767 } 768 769 if ('i' != applet0) { /* not insmod */ 770 /* Goto $VERSION directory */ 771 xchdir(uts.release); 772 } 773 774#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE 775 /* If not rmmod, parse possible module options given on command line. 776 * insmod/modprobe takes one module name, the rest are parameters. */ 777 options = NULL; 778 if ('r' != applet0) { 779 char **arg = argv; 780 while (*++arg) { 781 /* Enclose options in quotes */ 782 char *s = options; 783 options = xasprintf("%s \"%s\"", s ? s : "", *arg); 784 free(s); 785 *arg = NULL; 786 } 787 } 788#else 789 if ('r' != applet0) 790 argv[1] = NULL; 791#endif 792 793 if ('i' == applet0) { /* insmod */ 794 size_t len; 795 void *map; 796 797 len = MAXINT(ssize_t); 798 map = xmalloc_xopen_read_close(*argv, &len); 799 if (init_module(map, len, 800 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "") 801 IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("") 802 ) != 0) 803 bb_error_msg_and_die("can't insert '%s': %s", 804 *argv, moderror(errno)); 805 return 0; 806 } 807 808 /* Try to load modprobe.dep.bb */ 809 load_dep_bb(); 810 811 /* Load/remove modules. 812 * Only rmmod loops here, modprobe has only argv[0] */ 813 do { 814 process_module(*argv++, options); 815 } while (*argv); 816 817 if (ENABLE_FEATURE_CLEAN_UP) { 818 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);) 819 } 820 return EXIT_SUCCESS; 821} 822