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-rw-r--r--modutils/modprobe-small.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
new file mode 100644
index 0000000..bbcd989
--- /dev/null
+++ b/modutils/modprobe-small.c
@@ -0,0 +1,648 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * simplified modprobe
+ *
+ * Copyright (c) 2008 Vladimir Dronnikov
+ * Copyright (c) 2008 Bernhard Fischer (initial depmod code)
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include "unarchive.h"
+
+#include <sys/utsname.h> /* uname() */
+#include <fnmatch.h>
+
+/* libbb candidate */
+static void *xmalloc_read(int fd, size_t *sizep)
+{
+ char *buf;
+ size_t size, rd_size, total;
+ off_t to_read;
+ struct stat st;
+
+ to_read = sizep ? *sizep : INT_MAX; /* max to read */
+
+ /* Estimate file size */
+ st.st_size = 0; /* in case fstat fails, assume 0 */
+ fstat(fd, &st);
+ /* /proc/N/stat files report st_size 0 */
+ /* In order to make such files readable, we add small const */
+ size = (st.st_size | 0x3ff) + 1;
+
+ total = 0;
+ buf = NULL;
+ while (1) {
+ if (to_read < size)
+ size = to_read;
+ buf = xrealloc(buf, total + size + 1);
+ rd_size = full_read(fd, buf + total, size);
+ if ((ssize_t)rd_size < 0) { /* error */
+ free(buf);
+ return NULL;
+ }
+ total += rd_size;
+ if (rd_size < size) /* EOF */
+ break;
+ to_read -= rd_size;
+ if (to_read <= 0)
+ break;
+ /* grow by 1/8, but in [1k..64k] bounds */
+ size = ((total / 8) | 0x3ff) + 1;
+ if (size > 64*1024)
+ size = 64*1024;
+ }
+ xrealloc(buf, total + 1);
+ buf[total] = '\0';
+
+ if (sizep)
+ *sizep = total;
+ return buf;
+}
+
+
+//#define dbg1_error_msg(...) ((void)0)
+//#define dbg2_error_msg(...) ((void)0)
+#define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
+#define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
+
+extern int init_module(void *module, unsigned long len, const char *options);
+extern int delete_module(const char *module, unsigned flags);
+extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
+
+enum {
+ OPT_q = (1 << 0), /* be quiet */
+ OPT_r = (1 << 1), /* module removal instead of loading */
+};
+
+typedef struct module_info {
+ char *pathname;
+ char *desc;
+} module_info;
+
+/*
+ * GLOBALS
+ */
+struct globals {
+ module_info *modinfo;
+ char *module_load_options;
+ int module_count;
+ int module_found_idx;
+ int stringbuf_idx;
+ char stringbuf[32 * 1024]; /* some modules have lots of stuff */
+ /* for example, drivers/media/video/saa7134/saa7134.ko */
+};
+#define G (*ptr_to_globals)
+#define modinfo (G.modinfo )
+#define module_count (G.module_count )
+#define module_found_idx (G.module_found_idx )
+#define module_load_options (G.module_load_options)
+#define stringbuf_idx (G.stringbuf_idx )
+#define stringbuf (G.stringbuf )
+#define INIT_G() do { \
+ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+} while (0)
+
+
+static void appendc(char c)
+{
+ if (stringbuf_idx < sizeof(stringbuf))
+ stringbuf[stringbuf_idx++] = c;
+}
+
+static void append(const char *s)
+{
+ size_t len = strlen(s);
+ if (stringbuf_idx + len < sizeof(stringbuf)) {
+ memcpy(stringbuf + stringbuf_idx, s, len);
+ stringbuf_idx += len;
+ }
+}
+
+static void reset_stringbuf(void)
+{
+ stringbuf_idx = 0;
+}
+
+static char* copy_stringbuf(void)
+{
+ char *copy = xmalloc(stringbuf_idx);
+ return memcpy(copy, stringbuf, stringbuf_idx);
+}
+
+static char* find_keyword(char *ptr, size_t len, const char *word)
+{
+ int wlen;
+
+ if (!ptr) /* happens if read_module cannot read it */
+ return NULL;
+
+ wlen = strlen(word);
+ len -= wlen - 1;
+ while ((ssize_t)len > 0) {
+ char *old = ptr;
+ /* search for the first char in word */
+ ptr = memchr(ptr, *word, len);
+ if (ptr == NULL) /* no occurance left, done */
+ break;
+ if (strncmp(ptr, word, wlen) == 0)
+ return ptr + wlen; /* found, return ptr past it */
+ ++ptr;
+ len -= (ptr - old);
+ }
+ return NULL;
+}
+
+static void replace(char *s, char what, char with)
+{
+ while (*s) {
+ if (what == *s)
+ *s = with;
+ ++s;
+ }
+}
+
+#if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
+static char *xmalloc_open_zipped_read_close(const char *fname, size_t *sizep)
+{
+ size_t len;
+ char *image;
+ char *suffix;
+
+ int fd = open_or_warn(fname, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ suffix = strrchr(fname, '.');
+ if (suffix) {
+ if (strcmp(suffix, ".gz") == 0)
+ fd = open_transformer(fd, unpack_gz_stream, "gunzip");
+ else if (strcmp(suffix, ".bz2") == 0)
+ fd = open_transformer(fd, unpack_bz2_stream, "bunzip2");
+ }
+
+ len = (sizep) ? *sizep : 64 * 1024 * 1024;
+ image = xmalloc_read(fd, &len);
+ if (!image)
+ bb_perror_msg("read error from '%s'", fname);
+ close(fd);
+
+ if (sizep)
+ *sizep = len;
+ return image;
+}
+# define read_module xmalloc_open_zipped_read_close
+#else
+# define read_module xmalloc_open_read_close
+#endif
+
+/* We use error numbers in a loose translation... */
+static const char *moderror(int err)
+{
+ switch (err) {
+ case ENOEXEC:
+ return "invalid module format";
+ case ENOENT:
+ return "unknown symbol in module or invalid parameter";
+ case ESRCH:
+ return "module has wrong symbol version";
+ case EINVAL: /* "invalid parameter" */
+ return "unknown symbol in module or invalid parameter"
+ + sizeof("unknown symbol in module or");
+ default:
+ return strerror(err);
+ }
+}
+
+static int load_module(const char *fname, const char *options)
+{
+#if 1
+ int r;
+ size_t len = MAXINT(ssize_t);
+ char *module_image;
+ dbg1_error_msg("load_module('%s','%s')", fname, options);
+
+ module_image = read_module(fname, &len);
+ r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
+ free(module_image);
+ dbg1_error_msg("load_module:%d", r);
+ return r; /* 0 = success */
+#else
+ /* For testing */
+ dbg1_error_msg("load_module('%s','%s')", fname, options);
+ return 1;
+#endif
+}
+
+static char* parse_module(const char *pathname, const char *name)
+{
+ char *module_image;
+ char *ptr;
+ size_t len;
+ size_t pos;
+ dbg1_error_msg("parse_module('%s','%s')", pathname, name);
+
+ /* Read (possibly compressed) module */
+ len = 64 * 1024 * 1024; /* 64 Mb at most */
+ module_image = read_module(pathname, &len);
+
+ reset_stringbuf();
+
+ /* First desc line's format is
+ * "modname alias1 symbol:sym1 alias2 symbol:sym2 " (note trailing ' ')
+ */
+ append(name);
+ appendc(' ');
+ /* Aliases */
+ pos = 0;
+ while (1) {
+ ptr = find_keyword(module_image + pos, len - pos, "alias=");
+ if (!ptr) {
+ ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
+ if (!ptr)
+ break;
+ /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
+ * in many modules. What do they mean? */
+ if (strcmp(ptr, "gpl") != 0 && strcmp(ptr, "strings") != 0) {
+ dbg2_error_msg("alias: 'symbol:%s'", ptr);
+ append("symbol:");
+ }
+ } else {
+ dbg2_error_msg("alias: '%s'", ptr);
+ }
+ append(ptr);
+ appendc(' ');
+ pos = (ptr - module_image);
+ }
+ appendc('\0');
+
+ /* Second line: "dependency1 depandency2 " (note trailing ' ') */
+ ptr = find_keyword(module_image, len, "depends=");
+ if (ptr && *ptr) {
+ replace(ptr, ',', ' ');
+ replace(ptr, '-', '_');
+ dbg2_error_msg("dep:'%s'", ptr);
+ append(ptr);
+ }
+ appendc(' '); appendc('\0');
+
+ free(module_image);
+ return copy_stringbuf();
+}
+
+static char* pathname_2_modname(const char *pathname)
+{
+ const char *fname = bb_get_last_path_component_nostrip(pathname);
+ const char *suffix = strrstr(fname, ".ko");
+ char *name = xstrndup(fname, suffix - fname);
+ replace(name, '-', '_');
+ return name;
+}
+
+static FAST_FUNC int fileAction(const char *pathname,
+ struct stat *sb ATTRIBUTE_UNUSED,
+ void *data,
+ int depth ATTRIBUTE_UNUSED)
+{
+ int cur;
+ char *name;
+ const char *fname;
+
+ pathname += 2; /* skip "./" */
+ fname = bb_get_last_path_component_nostrip(pathname);
+ if (!strrstr(fname, ".ko")) {
+ dbg1_error_msg("'%s' is not a module", pathname);
+ return TRUE; /* not a module, continue search */
+ }
+
+ cur = module_count++;
+ if (!(cur & 0xfff)) {
+ modinfo = xrealloc(modinfo, sizeof(modinfo[0]) * (cur + 0x1001));
+ }
+ modinfo[cur].pathname = xstrdup(pathname);
+ modinfo[cur].desc = NULL;
+ modinfo[cur+1].pathname = NULL;
+ modinfo[cur+1].desc = NULL;
+
+ name = pathname_2_modname(fname);
+ if (strcmp(name, data) != 0) {
+ free(name);
+ dbg1_error_msg("'%s' module name doesn't match", pathname);
+ return TRUE; /* module name doesn't match, continue search */
+ }
+
+ dbg1_error_msg("'%s' module name matches", pathname);
+ module_found_idx = cur;
+ modinfo[cur].desc = parse_module(pathname, name);
+
+ if (!(option_mask32 & OPT_r)) {
+ if (load_module(pathname, module_load_options) == 0) {
+ /* Load was successful, there is nothing else to do.
+ * This can happen ONLY for "top-level" module load,
+ * not a dep, because deps dont do dirscan. */
+ exit(EXIT_SUCCESS);
+ /*free(name);return RECURSE_RESULT_ABORT;*/
+ }
+ }
+
+ free(name);
+ return TRUE;
+}
+
+static module_info* find_alias(const char *alias)
+{
+ int i;
+ dbg1_error_msg("find_alias('%s')", alias);
+
+ /* First try to find by name (cheaper) */
+ i = 0;
+ while (modinfo[i].pathname) {
+ char *name = pathname_2_modname(modinfo[i].pathname);
+ if (strcmp(name, alias) == 0) {
+ dbg1_error_msg("found '%s' in module '%s'",
+ alias, modinfo[i].pathname);
+ if (!modinfo[i].desc)
+ modinfo[i].desc = parse_module(modinfo[i].pathname, name);
+ free(name);
+ return &modinfo[i];
+ }
+ free(name);
+ i++;
+ }
+
+ /* Scan all module bodies, extract modinfo (it contains aliases) */
+ i = 0;
+ while (modinfo[i].pathname) {
+ char *desc, *s;
+ if (!modinfo[i].desc) {
+ char *name = pathname_2_modname(modinfo[i].pathname);
+ modinfo[i].desc = parse_module(modinfo[i].pathname, name);
+ free(name);
+ }
+ /* "modname alias1 symbol:sym1 alias2 symbol:sym2 " */
+ desc = xstrdup(modinfo[i].desc);
+ /* Does matching substring exist? */
+ replace(desc, ' ', '\0');
+ for (s = desc; *s; s += strlen(s) + 1) {
+ if (strcmp(s, alias) == 0) {
+ free(desc);
+ dbg1_error_msg("found alias '%s' in module '%s'",
+ alias, modinfo[i].pathname);
+ return &modinfo[i];
+ }
+ }
+ free(desc);
+ i++;
+ }
+ dbg1_error_msg("find_alias '%s' returns NULL", alias);
+ return NULL;
+}
+
+#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
+static int already_loaded(const char *name)
+{
+ int ret = 0;
+ int len = strlen(name);
+ char *line;
+ FILE* modules;
+
+ modules = xfopen("/proc/modules", "r");
+ while ((line = xmalloc_fgets(modules)) != NULL) {
+ if (strncmp(line, name, len) == 0 && line[len] == ' ') {
+ free(line);
+ ret = 1;
+ break;
+ }
+ free(line);
+ }
+ fclose(modules);
+ return ret;
+}
+#else
+#define already_loaded(name) is_rmmod
+#endif
+
+/*
+ Given modules definition and module name (or alias, or symbol)
+ load/remove the module respecting dependencies
+*/
+#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
+#define process_module(a,b) process_module(a)
+#define cmdline_options ""
+#endif
+static void process_module(char *name, const char *cmdline_options)
+{
+ char *s, *deps, *options;
+ module_info *info;
+ int is_rmmod = (option_mask32 & OPT_r) != 0;
+ dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
+
+ replace(name, '-', '_');
+
+ dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
+ if (already_loaded(name) != is_rmmod) {
+ dbg1_error_msg("nothing to do for '%s'", name);
+ return;
+ }
+
+ options = NULL;
+ if (!is_rmmod) {
+ char *opt_filename = xasprintf("/etc/modules/%s", name);
+ options = xmalloc_open_read_close(opt_filename, NULL);
+ if (options)
+ replace(options, '\n', ' ');
+#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
+ if (cmdline_options) {
+ /* NB: cmdline_options always have one leading ' '
+ * (see main()), we remove it here */
+ char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
+ cmdline_options + 1, options);
+ free(options);
+ options = op;
+ }
+#endif
+ free(opt_filename);
+ module_load_options = options;
+ dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
+ }
+
+ if (!module_count) {
+ /* Scan module directory. This is done only once.
+ * It will attempt module load, and will exit(EXIT_SUCCESS)
+ * on success. */
+ module_found_idx = -1;
+ recursive_action(".",
+ ACTION_RECURSE, /* flags */
+ fileAction, /* file action */
+ NULL, /* dir action */
+ name, /* user data */
+ 0); /* depth */
+ dbg1_error_msg("dirscan complete");
+ /* Module was not found, or load failed, or is_rmmod */
+ if (module_found_idx >= 0) { /* module was found */
+ info = &modinfo[module_found_idx];
+ } else { /* search for alias, not a plain module name */
+ info = find_alias(name);
+ }
+ } else {
+ info = find_alias(name);
+ }
+
+ /* rmmod? unload it by name */
+ if (is_rmmod) {
+ if (delete_module(name, O_NONBLOCK|O_EXCL) != 0
+ && !(option_mask32 & OPT_q)
+ ) {
+ bb_perror_msg("remove '%s'", name);
+ goto ret;
+ }
+ /* N.B. we do not stop here -
+ * continue to unload modules on which the module depends:
+ * "-r --remove: option causes modprobe to remove a module.
+ * If the modules it depends on are also unused, modprobe
+ * will try to remove them, too." */
+ }
+
+ if (!info) { /* both dirscan and find_alias found nothing */
+ goto ret;
+ }
+
+ /* Second line of desc contains dependencies */
+ deps = xstrdup(info->desc + strlen(info->desc) + 1);
+
+ /* Transform deps to string list */
+ replace(deps, ' ', '\0');
+ /* 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;
+}
generated by cgit v1.1 at 2024-12-30 19:14:17 +0000