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15kb smaller than standard one. libbb/recursive_action.c: commented-out code for aborting the scan.
649 lines
16 KiB
C
649 lines
16 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* simplified modprobe
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*
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* Copyright (c) 2008 Vladimir Dronnikov
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* Copyright (c) 2008 Bernhard Fischer (initial depmod code)
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "unarchive.h"
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#include <sys/utsname.h> /* uname() */
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#include <fnmatch.h>
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/* libbb candidate */
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static void *xmalloc_read(int fd, size_t *sizep)
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{
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char *buf;
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size_t size, rd_size, total;
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off_t to_read;
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struct stat st;
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to_read = sizep ? *sizep : INT_MAX; /* max to read */
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/* Estimate file size */
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st.st_size = 0; /* in case fstat fails, assume 0 */
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fstat(fd, &st);
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/* /proc/N/stat files report st_size 0 */
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/* In order to make such files readable, we add small const */
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size = (st.st_size | 0x3ff) + 1;
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total = 0;
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buf = NULL;
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while (1) {
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if (to_read < size)
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size = to_read;
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buf = xrealloc(buf, total + size + 1);
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rd_size = full_read(fd, buf + total, size);
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if ((ssize_t)rd_size < 0) { /* error */
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free(buf);
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return NULL;
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}
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total += rd_size;
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if (rd_size < size) /* EOF */
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break;
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to_read -= rd_size;
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if (to_read <= 0)
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break;
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/* grow by 1/8, but in [1k..64k] bounds */
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size = ((total / 8) | 0x3ff) + 1;
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if (size > 64*1024)
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size = 64*1024;
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}
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xrealloc(buf, total + 1);
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buf[total] = '\0';
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if (sizep)
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*sizep = total;
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return buf;
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}
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//#define dbg1_error_msg(...) ((void)0)
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//#define dbg2_error_msg(...) ((void)0)
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#define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
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#define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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extern int init_module(void *module, unsigned long len, const char *options);
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extern int delete_module(const char *module, unsigned flags);
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extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
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enum {
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OPT_q = (1 << 0), /* be quiet */
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OPT_r = (1 << 1), /* module removal instead of loading */
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};
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typedef struct module_info {
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char *pathname;
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char *desc;
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} module_info;
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/*
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* GLOBALS
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*/
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struct globals {
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module_info *modinfo;
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char *module_load_options;
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int module_count;
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int module_found_idx;
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int stringbuf_idx;
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char stringbuf[32 * 1024]; /* some modules have lots of stuff */
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/* for example, drivers/media/video/saa7134/saa7134.ko */
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};
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#define G (*ptr_to_globals)
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#define modinfo (G.modinfo )
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#define module_count (G.module_count )
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#define module_found_idx (G.module_found_idx )
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#define module_load_options (G.module_load_options)
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#define stringbuf_idx (G.stringbuf_idx )
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#define stringbuf (G.stringbuf )
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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} while (0)
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static void appendc(char c)
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{
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if (stringbuf_idx < sizeof(stringbuf))
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stringbuf[stringbuf_idx++] = c;
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}
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static void append(const char *s)
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{
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size_t len = strlen(s);
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if (stringbuf_idx + len < sizeof(stringbuf)) {
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memcpy(stringbuf + stringbuf_idx, s, len);
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stringbuf_idx += len;
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}
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}
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static void reset_stringbuf(void)
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{
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stringbuf_idx = 0;
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}
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static char* copy_stringbuf(void)
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{
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char *copy = xmalloc(stringbuf_idx);
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return memcpy(copy, stringbuf, stringbuf_idx);
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}
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static char* find_keyword(char *ptr, size_t len, const char *word)
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{
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int wlen;
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if (!ptr) /* happens if read_module cannot read it */
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return NULL;
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wlen = strlen(word);
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len -= wlen - 1;
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while ((ssize_t)len > 0) {
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char *old = ptr;
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/* search for the first char in word */
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ptr = memchr(ptr, *word, len);
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if (ptr == NULL) /* no occurance left, done */
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break;
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if (strncmp(ptr, word, wlen) == 0)
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return ptr + wlen; /* found, return ptr past it */
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++ptr;
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len -= (ptr - old);
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}
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return NULL;
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}
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static void replace(char *s, char what, char with)
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{
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while (*s) {
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if (what == *s)
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*s = with;
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++s;
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}
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}
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#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
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static char *xmalloc_open_zipped_read_close(const char *fname, size_t *sizep)
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{
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size_t len;
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char *image;
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char *suffix;
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int fd = open_or_warn(fname, O_RDONLY);
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if (fd < 0)
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return NULL;
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suffix = strrchr(fname, '.');
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if (suffix) {
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if (strcmp(suffix, ".gz") == 0)
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fd = open_transformer(fd, unpack_gz_stream, "gunzip");
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else if (strcmp(suffix, ".bz2") == 0)
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fd = open_transformer(fd, unpack_bz2_stream, "bunzip2");
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}
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len = (sizep) ? *sizep : 64 * 1024 * 1024;
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image = xmalloc_read(fd, &len);
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if (!image)
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bb_perror_msg("read error from '%s'", fname);
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close(fd);
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if (sizep)
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*sizep = len;
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return image;
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}
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# define read_module xmalloc_open_zipped_read_close
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#else
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# define read_module xmalloc_open_read_close
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#endif
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/* We use error numbers in a loose translation... */
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static const char *moderror(int err)
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{
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switch (err) {
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case ENOEXEC:
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return "invalid module format";
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case ENOENT:
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return "unknown symbol in module or invalid parameter";
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case ESRCH:
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return "module has wrong symbol version";
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case EINVAL: /* "invalid parameter" */
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return "unknown symbol in module or invalid parameter"
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+ sizeof("unknown symbol in module or");
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default:
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return strerror(err);
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}
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}
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static int load_module(const char *fname, const char *options)
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{
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#if 1
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int r;
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size_t len = MAXINT(ssize_t);
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char *module_image;
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dbg1_error_msg("load_module('%s','%s')", fname, options);
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module_image = read_module(fname, &len);
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r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
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free(module_image);
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dbg1_error_msg("load_module:%d", r);
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return r; /* 0 = success */
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#else
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/* For testing */
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dbg1_error_msg("load_module('%s','%s')", fname, options);
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return 1;
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#endif
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}
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static char* parse_module(const char *pathname, const char *name)
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{
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char *module_image;
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char *ptr;
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size_t len;
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size_t pos;
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dbg1_error_msg("parse_module('%s','%s')", pathname, name);
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/* Read (possibly compressed) module */
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len = 64 * 1024 * 1024; /* 64 Mb at most */
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module_image = read_module(pathname, &len);
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reset_stringbuf();
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/* First desc line's format is
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* "modname alias1 symbol:sym1 alias2 symbol:sym2 " (note trailing ' ')
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*/
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append(name);
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appendc(' ');
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/* Aliases */
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pos = 0;
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while (1) {
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ptr = find_keyword(module_image + pos, len - pos, "alias=");
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if (!ptr) {
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ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
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if (!ptr)
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break;
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/* DOCME: __ksymtab_gpl and __ksymtab_strings occur
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* in many modules. What do they mean? */
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if (strcmp(ptr, "gpl") != 0 && strcmp(ptr, "strings") != 0) {
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dbg2_error_msg("alias: 'symbol:%s'", ptr);
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append("symbol:");
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}
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} else {
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dbg2_error_msg("alias: '%s'", ptr);
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}
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append(ptr);
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appendc(' ');
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pos = (ptr - module_image);
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}
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appendc('\0');
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/* Second line: "dependency1 depandency2 " (note trailing ' ') */
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ptr = find_keyword(module_image, len, "depends=");
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if (ptr && *ptr) {
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replace(ptr, ',', ' ');
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replace(ptr, '-', '_');
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dbg2_error_msg("dep:'%s'", ptr);
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append(ptr);
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}
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appendc(' '); appendc('\0');
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free(module_image);
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return copy_stringbuf();
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}
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static char* pathname_2_modname(const char *pathname)
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{
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const char *fname = bb_get_last_path_component_nostrip(pathname);
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const char *suffix = strrstr(fname, ".ko");
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char *name = xstrndup(fname, suffix - fname);
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replace(name, '-', '_');
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return name;
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}
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static FAST_FUNC int fileAction(const char *pathname,
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struct stat *sb ATTRIBUTE_UNUSED,
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void *data,
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int depth ATTRIBUTE_UNUSED)
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{
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int cur;
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char *name;
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const char *fname;
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pathname += 2; /* skip "./" */
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fname = bb_get_last_path_component_nostrip(pathname);
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if (!strrstr(fname, ".ko")) {
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dbg1_error_msg("'%s' is not a module", pathname);
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return TRUE; /* not a module, continue search */
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}
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cur = module_count++;
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if (!(cur & 0xfff)) {
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modinfo = xrealloc(modinfo, sizeof(modinfo[0]) * (cur + 0x1001));
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}
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modinfo[cur].pathname = xstrdup(pathname);
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modinfo[cur].desc = NULL;
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modinfo[cur+1].pathname = NULL;
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modinfo[cur+1].desc = NULL;
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name = pathname_2_modname(fname);
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if (strcmp(name, data) != 0) {
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free(name);
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dbg1_error_msg("'%s' module name doesn't match", pathname);
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return TRUE; /* module name doesn't match, continue search */
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}
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dbg1_error_msg("'%s' module name matches", pathname);
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module_found_idx = cur;
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modinfo[cur].desc = parse_module(pathname, name);
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if (!(option_mask32 & OPT_r)) {
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if (load_module(pathname, module_load_options) == 0) {
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/* Load was successful, there is nothing else to do.
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* This can happen ONLY for "top-level" module load,
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* not a dep, because deps dont do dirscan. */
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exit(EXIT_SUCCESS);
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/*free(name);return RECURSE_RESULT_ABORT;*/
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}
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}
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free(name);
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return TRUE;
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}
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static module_info* find_alias(const char *alias)
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{
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int i;
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dbg1_error_msg("find_alias('%s')", alias);
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/* First try to find by name (cheaper) */
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i = 0;
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while (modinfo[i].pathname) {
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char *name = pathname_2_modname(modinfo[i].pathname);
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if (strcmp(name, alias) == 0) {
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dbg1_error_msg("found '%s' in module '%s'",
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alias, modinfo[i].pathname);
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if (!modinfo[i].desc)
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modinfo[i].desc = parse_module(modinfo[i].pathname, name);
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free(name);
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return &modinfo[i];
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}
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free(name);
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i++;
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}
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/* Scan all module bodies, extract modinfo (it contains aliases) */
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i = 0;
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while (modinfo[i].pathname) {
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char *desc, *s;
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if (!modinfo[i].desc) {
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char *name = pathname_2_modname(modinfo[i].pathname);
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modinfo[i].desc = parse_module(modinfo[i].pathname, name);
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free(name);
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}
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/* "modname alias1 symbol:sym1 alias2 symbol:sym2 " */
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desc = xstrdup(modinfo[i].desc);
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/* Does matching substring exist? */
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replace(desc, ' ', '\0');
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for (s = desc; *s; s += strlen(s) + 1) {
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if (strcmp(s, alias) == 0) {
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free(desc);
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dbg1_error_msg("found alias '%s' in module '%s'",
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alias, modinfo[i].pathname);
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return &modinfo[i];
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}
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}
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free(desc);
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i++;
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}
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dbg1_error_msg("find_alias '%s' returns NULL", alias);
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return NULL;
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}
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#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
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static int already_loaded(const char *name)
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{
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int ret = 0;
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int len = strlen(name);
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char *line;
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FILE* modules;
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modules = xfopen("/proc/modules", "r");
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while ((line = xmalloc_fgets(modules)) != NULL) {
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if (strncmp(line, name, len) == 0 && line[len] == ' ') {
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free(line);
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ret = 1;
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break;
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}
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free(line);
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}
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fclose(modules);
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return ret;
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}
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#else
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#define already_loaded(name) is_rmmod
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#endif
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/*
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Given modules definition and module name (or alias, or symbol)
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load/remove the module respecting dependencies
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*/
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#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
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#define process_module(a,b) process_module(a)
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#define cmdline_options ""
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#endif
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static void process_module(char *name, const char *cmdline_options)
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{
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char *s, *deps, *options;
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module_info *info;
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int is_rmmod = (option_mask32 & OPT_r) != 0;
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dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
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replace(name, '-', '_');
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dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
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if (already_loaded(name) != is_rmmod) {
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dbg1_error_msg("nothing to do for '%s'", name);
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return;
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}
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options = NULL;
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if (!is_rmmod) {
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char *opt_filename = xasprintf("/etc/modules/%s", name);
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options = xmalloc_open_read_close(opt_filename, NULL);
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if (options)
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replace(options, '\n', ' ');
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#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
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if (cmdline_options) {
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/* NB: cmdline_options always have one leading ' '
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* (see main()), we remove it here */
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char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
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cmdline_options + 1, options);
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free(options);
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options = op;
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}
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#endif
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free(opt_filename);
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module_load_options = options;
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dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
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}
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if (!module_count) {
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/* Scan module directory. This is done only once.
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* It will attempt module load, and will exit(EXIT_SUCCESS)
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* on success. */
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module_found_idx = -1;
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recursive_action(".",
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ACTION_RECURSE, /* flags */
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fileAction, /* file action */
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NULL, /* dir action */
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name, /* user data */
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0); /* depth */
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dbg1_error_msg("dirscan complete");
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/* Module was not found, or load failed, or is_rmmod */
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if (module_found_idx >= 0) { /* module was found */
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info = &modinfo[module_found_idx];
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} else { /* search for alias, not a plain module name */
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info = find_alias(name);
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}
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} else {
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info = find_alias(name);
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}
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/* rmmod? unload it by name */
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if (is_rmmod) {
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if (delete_module(name, O_NONBLOCK|O_EXCL) != 0
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&& !(option_mask32 & OPT_q)
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) {
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bb_perror_msg("remove '%s'", name);
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goto ret;
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}
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/* N.B. we do not stop here -
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* continue to unload modules on which the module depends:
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* "-r --remove: option causes modprobe to remove a module.
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* If the modules it depends on are also unused, modprobe
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* will try to remove them, too." */
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}
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if (!info) { /* both dirscan and find_alias found nothing */
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goto ret;
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}
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/* Second line of desc contains dependencies */
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deps = xstrdup(info->desc + strlen(info->desc) + 1);
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/* Transform deps to string list */
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replace(deps, ' ', '\0');
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/* Iterate thru dependencies, trying to (un)load them */
|
|
for (s = deps; *s; s += strlen(s) + 1) {
|
|
//if (strcmp(name, s) != 0) // N.B. do loops exist?
|
|
dbg1_error_msg("recurse on dep '%s'", s);
|
|
process_module(s, NULL);
|
|
dbg1_error_msg("recurse on dep '%s' done", s);
|
|
}
|
|
free(deps);
|
|
|
|
/* insmod -> load it */
|
|
if (!is_rmmod) {
|
|
errno = 0;
|
|
if (load_module(info->pathname, options) != 0) {
|
|
if (EEXIST != errno) {
|
|
bb_error_msg("insert '%s' %s: %s",
|
|
info->pathname, options,
|
|
moderror(errno));
|
|
} else {
|
|
dbg1_error_msg("insert '%s' %s: %s",
|
|
info->pathname, options,
|
|
moderror(errno));
|
|
}
|
|
}
|
|
}
|
|
ret:
|
|
free(options);
|
|
//TODO: return load attempt result from process_module.
|
|
//If dep didn't load ok, continuing makes little sense.
|
|
}
|
|
#undef cmdline_options
|
|
|
|
|
|
/* For reference, module-init-tools-0.9.15-pre2 options:
|
|
|
|
# insmod
|
|
Usage: insmod filename [args]
|
|
|
|
# rmmod --help
|
|
Usage: rmmod [-fhswvV] modulename ...
|
|
-f (or --force) forces a module unload, and may crash your machine.
|
|
-s (or --syslog) says use syslog, not stderr
|
|
-v (or --verbose) enables more messages
|
|
-w (or --wait) begins a module removal even if it is used
|
|
and will stop new users from accessing the module (so it
|
|
should eventually fall to zero).
|
|
|
|
# modprobe
|
|
Usage: modprobe [--verbose|--version|--config|--remove] filename [options]
|
|
|
|
# depmod --help
|
|
depmod 0.9.15-pre2 -- part of module-init-tools
|
|
depmod -[aA] [-n -e -v -q -V -r -u] [-b basedirectory] [forced_version]
|
|
depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.o module2.o ...
|
|
If no arguments (except options) are given, "depmod -a" is assumed
|
|
|
|
depmod will output a dependancy list suitable for the modprobe utility.
|
|
|
|
Options:
|
|
-a, --all Probe all modules
|
|
-n, --show Write the dependency file on stdout only
|
|
-b basedirectory
|
|
--basedir basedirectory Use an image of a module tree.
|
|
-F kernelsyms
|
|
--filesyms kernelsyms Use the file instead of the
|
|
current kernel symbols.
|
|
*/
|
|
|
|
int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int modprobe_main(int ATTRIBUTE_UNUSED argc, char **argv)
|
|
{
|
|
struct utsname uts;
|
|
char applet0 = applet_name[0];
|
|
USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
|
|
|
|
/* depmod is a stub */
|
|
if ('d' == applet0)
|
|
return EXIT_SUCCESS;
|
|
|
|
/* are we lsmod? -> just dump /proc/modules */
|
|
if ('l' == applet0) {
|
|
xprint_and_close_file(xfopen("/proc/modules", "r"));
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
INIT_G();
|
|
|
|
/* insmod, modprobe, rmmod require at least one argument */
|
|
opt_complementary = "-1";
|
|
/* only -q (quiet) and -r (rmmod),
|
|
* the rest are accepted and ignored (compat) */
|
|
getopt32(argv, "qrfsvw");
|
|
argv += optind;
|
|
|
|
/* are we rmmod? -> simulate modprobe -r */
|
|
if ('r' == applet0) {
|
|
option_mask32 |= OPT_r;
|
|
}
|
|
|
|
/* goto modules directory */
|
|
xchdir(CONFIG_DEFAULT_MODULES_DIR);
|
|
uname(&uts); /* never fails */
|
|
xchdir(uts.release);
|
|
|
|
#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
|
/* If not rmmod, parse possible module options given on command line.
|
|
* insmod/modprobe takes one module name, the rest are parameters. */
|
|
options = NULL;
|
|
if ('r' != applet0) {
|
|
char **arg = argv;
|
|
while (*++arg) {
|
|
/* Enclose options in quotes */
|
|
char *s = options;
|
|
options = xasprintf("%s \"%s\"", s ? s : "", *arg);
|
|
free(s);
|
|
*arg = NULL;
|
|
}
|
|
}
|
|
#else
|
|
if ('r' != applet0)
|
|
argv[1] = NULL;
|
|
#endif
|
|
|
|
/* Load/remove modules.
|
|
* Only rmmod loops here, insmod/modprobe has only argv[0] */
|
|
do {
|
|
process_module(*argv++, options);
|
|
} while (*argv);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|