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path: root/main/busybox/0009-depmod-support-generating-kmod-binary-index-files.patch
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From 24f932672e826e8f93955d0c6dd6bca140f3fa98 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Sun, 25 Oct 2015 22:21:41 +0200
Subject: [PATCH] depmod: support generating kmod binary index files

This allows to use busybox depmod, and run daemons using libkmod (or
even kmod modprobe if needed).

About +1500 bytes when enabled. This patch merges some depmod code
paths, so when this is disabled it shrinks the code size a little bit.
---
 modutils/Config.src |   9 ++
 modutils/depmod.c   | 281 ++++++++++++++++++++++++++++++++++++--------
 modutils/modprobe.c |  15 ---
 modutils/modutils.c |  31 +++++
 modutils/modutils.h |  16 +++
 5 files changed, 286 insertions(+), 66 deletions(-)

diff --git a/modutils/Config.src b/modutils/Config.src
index 188296814..7a4c037ad 100644
--- a/modutils/Config.src
+++ b/modutils/Config.src
@@ -152,6 +152,15 @@ config FEATURE_MODUTILS_ALIAS
 
 	Say Y if unsure.
 
+config FEATURE_MODUTILS_BIN
+	bool "Support for the kmod .bin file format"
+	default n
+	depends on DEPMOD && !MODPROBE_SMALL
+	help
+	  Generate kmod compatible binary index files for .dep, .alias,
+	  .symbols and .builtin files. Allows mixing use of busybox
+	  modutils and kmod (binaries and library).
+
 config FEATURE_MODUTILS_SYMBOLS
 	bool "Support module.symbols file"
 	default y
diff --git a/modutils/depmod.c b/modutils/depmod.c
index 004c67a11..05c1a9bce 100644
--- a/modutils/depmod.c
+++ b/modutils/depmod.c
@@ -2,7 +2,7 @@
 /*
  * depmod - generate modules.dep
  * Copyright (c) 2008 Bernhard Reutner-Fischer
- * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
+ * Copyrihgt (c) 2008-2015 Timo Teras <timo.teras@iki.fi>
  * Copyright (c) 2008 Vladimir Dronnikov
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
@@ -26,6 +26,24 @@
 #include "modutils.h"
 #include <sys/utsname.h> /* uname() */
 
+#define INDEX_MINCHAR	32
+#define INDEX_MAXCHAR	128
+
+typedef struct index_node {
+	char *prefix;
+	llist_t *values;
+	struct index_node *children[INDEX_MAXCHAR-INDEX_MINCHAR];
+} index_node;
+
+struct globals {
+	module_db db;
+	index_node *root_node;
+} FIX_ALIASING;
+#define G (*ptr_to_globals)
+#define INIT_G() do { \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+} while (0)
+
 /*
  * Theory of operation:
  * - iterate over all modules and record their full path
@@ -53,18 +71,12 @@ static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARA
 
 	for (ptr = image; ptr < image + len - 10; ptr++) {
 		if (is_prefixed_with(ptr, "depends=")) {
-			char *u;
-
 			ptr += 8;
-			for (u = ptr; *u; u++)
-				if (*u == '-')
-					*u = '_';
-			ptr += string_to_llist(ptr, &e->deps, ",");
+			string_to_llist(replace_underscores(ptr), &e->deps, ",");
 		} else if (ENABLE_FEATURE_MODUTILS_ALIAS
 		 && is_prefixed_with(ptr, "alias=")
 		) {
-			llist_add_to(&e->aliases, xstrdup(ptr + 6));
-			ptr += strlen(ptr);
+			llist_add_to(&e->aliases, replace_underscores(xstrdup(ptr + 6)));
 		} else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
 		 && is_prefixed_with(ptr, "__ksymtab_")
 		) {
@@ -74,9 +86,10 @@ static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARA
 			) {
 				continue;
 			}
-			llist_add_to(&e->symbols, xstrdup(ptr));
-			ptr += strlen(ptr);
-		}
+			llist_add_to(&e->symbols, xasprintf("symbol:%s", ptr));
+		} else
+			continue;
+		ptr += strlen(ptr);
 	}
 	free(image);
 
@@ -108,12 +121,6 @@ static void order_dep_list(module_db *modules, module_entry *start, llist_t *add
 	}
 }
 
-static void xfreopen_write(const char *file, FILE *f)
-{
-	if (freopen(file, "w", f) == NULL)
-		bb_perror_msg_and_die("can't open '%s'", file);
-}
-
 //usage:#if !ENABLE_MODPROBE_SMALL
 //usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
 //usage:#define depmod_full_usage "\n\n"
@@ -167,6 +174,169 @@ enum {
 	OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
 };
 
+/* Support for the mod binary index generation */
+
+static void index_init(const char *filename)
+{
+	if (ENABLE_FEATURE_MODUTILS_BIN) {
+		index_node *n;
+
+		n = xzalloc(sizeof(index_node));
+		n->prefix = xstrdup("");
+		G.root_node = n;
+	}
+
+	if (filename && !(option_mask32 & OPT_n)) {
+		if (freopen(filename, "w", stdout) == NULL)
+			bb_perror_msg_and_die("can't open '%s'", filename);
+	}
+}
+
+static void index_add(const char *key, char *value, const char *prefix)
+{
+	if (prefix && *prefix)
+		printf("%s%s %s\n", prefix, key, value);
+	else if (prefix)
+		printf("%s\n", value);
+
+	if (ENABLE_FEATURE_MODUTILS_BIN) {
+		index_node *cur = G.root_node, *n;
+		unsigned i = 0, j, ch;
+
+		while (1) {
+			/* Ensure node->prefix is a prefix of &str[i].
+			 * If it is not already, then we must split node. */
+			for (j = 0; cur->prefix[j]; j++) {
+				ch = cur->prefix[j];
+				if (ch != key[i+j]) {
+					/* New child is copy of node with prefix[j+1..N] */
+					n = xzalloc(sizeof(index_node));
+					n->prefix = xstrdup(&cur->prefix[j+1]);
+					n->values = cur->values;
+					memcpy(n->children, cur->children, sizeof(n->children));
+
+					/* Parent has prefix[0..j], child at prefix[j] */
+					cur->prefix[j] = '\0';
+					cur->values = NULL;
+					memset(cur->children, 0, sizeof(cur->children));
+					cur->children[ch-INDEX_MINCHAR] = n;
+					break;
+				}
+			}
+			i += j;
+
+			ch = key[i];
+			if (ch == 0)
+				break;
+
+			if (ch < INDEX_MINCHAR || ch >= INDEX_MAXCHAR)
+				bb_error_msg_and_die("bad module name");
+
+			ch -= INDEX_MINCHAR;
+			if (!cur->children[ch]) {
+				n = xzalloc(sizeof(index_node));
+				cur->children[ch] = n;
+				n->prefix = xstrdup(&key[i+1]);
+				cur = n;
+				break;
+			}
+
+			/* Descend into child node and continue */
+			cur = cur->children[ch];
+			i++;
+		}
+
+		llist_add_to(&cur->values, value);
+	}
+}
+
+static uint32_t index_write_node(FILE *out, index_node *n, void (*freeit)(void *data))
+{
+	uint32_t child_offs[INDEX_MAXCHAR-INDEX_MINCHAR];
+	uint32_t offset;
+	uint8_t first = 255, last = 0;
+	unsigned i;
+
+	for (i = 0; i < INDEX_MAXCHAR-INDEX_MINCHAR; i++) {
+		child_offs[i] = 0;
+		if (!n->children[i])
+			continue;
+		child_offs[i] = index_write_node(out, n->children[i], freeit);
+		if (first > INDEX_MAXCHAR)
+			first = i;
+		last = i;
+	}
+
+	offset = ftell(out);
+
+	if (n->prefix[0]) {
+		fputs(n->prefix, out);
+		fputc('\0', out);
+		offset |= INDEX_NODE_PREFIX;
+	}
+
+	if (first < INDEX_MAXCHAR) {
+		fputc(first + INDEX_MINCHAR, out);
+		fputc(last + INDEX_MINCHAR, out);
+		fwrite(child_offs + first, sizeof(uint32_t), last - first + 1, out);
+		offset |= INDEX_NODE_CHILDS;
+	}
+
+	if (n->values) {
+		const llist_t *v;
+		unsigned int cnt;
+		uint32_t u;
+
+		n->values = llist_rev(n->values);
+		for (v = n->values, cnt = 0; v != NULL; v = v->link, cnt++);
+		u = htonl(cnt);
+		fwrite(&u, sizeof(u), 1, out);
+		for (v = n->values, cnt = 0; v != NULL; v = v->link, cnt++) {
+			u = htonl(cnt);
+			fwrite(&u, sizeof(u), 1, out);
+			fputs(v->data, out);
+			fputc('\0', out);
+		}
+		offset |= INDEX_NODE_VALUES;
+	}
+
+	llist_free(n->values, freeit);
+	free(n->prefix);
+	free(n);
+
+	return htonl(offset);
+}
+
+static void index_dump(const char *filename, int deps_file)
+{
+	if (ENABLE_FEATURE_MODUTILS_BIN) {
+		FILE *out;
+		uint32_t header[3] = {
+			htonl(INDEX_MAGIC),
+			htonl(INDEX_VERSION),
+		};
+
+		if (option_mask32 & OPT_n)
+			filename = "/dev/null";
+		else
+			filename = xasprintf("tmp.%s.bin", filename);
+
+		out = xfopen_for_write(filename);
+		fwrite(header, sizeof(uint32_t), 3, out);
+		header[2] = index_write_node(out, G.root_node, deps_file ? free : 0);
+		rewind(out);
+		G.root_node = NULL;
+		fwrite(header, sizeof(uint32_t), 3, out);
+		if (fclose(out)) {
+			remove(filename);
+			bb_error_msg_and_die(bb_msg_write_error);
+		}
+		/* .bin files are mmap'ed; not renaming it may crash
+		 * long standing daemon using libkmod */
+		rename_or_warn(filename, filename + 4);
+	}
+}
+
 int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int depmod_main(int argc UNUSED_PARAM, char **argv)
 {
@@ -178,6 +348,8 @@ int depmod_main(int argc UNUSED_PARAM, char **argv)
 	unsigned i;
 	int tmp;
 
+	INIT_G();
+
 	getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
 	argv += optind;
 
@@ -210,53 +382,60 @@ int depmod_main(int argc UNUSED_PARAM, char **argv)
 	}
 
 	/* Generate dependency and alias files */
-	if (!(option_mask32 & OPT_n))
-		xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
-
+	index_init(CONFIG_DEFAULT_DEPMOD_FILE);
 	moddb_foreach_module(&modules, m, i) {
-		printf("%s:", m->name);
-
+		char *buf = xasprintf("%s:", m->name);
 		order_dep_list(&modules, m, m->deps);
+
 		while (m->dnext != m) {
 			dep = m->dnext;
-			printf(" %s", dep->name);
-
+			buf = gather_options_str(buf, dep->name);
 			/* unlink current entry */
 			dep->dnext->dprev = dep->dprev;
 			dep->dprev->dnext = dep->dnext;
 			dep->dnext = dep->dprev = dep;
 		}
-		bb_putchar('\n');
+		index_add(m->modname, buf, "");
 	}
-
-#if ENABLE_FEATURE_MODUTILS_ALIAS
-	if (!(option_mask32 & OPT_n))
-		xfreopen_write("modules.alias", stdout);
-	moddb_foreach_module(&modules, m, i) {
-		while (m->aliases) {
-			/*
-			 * Last word used to be a basename
-			 * (filename with path and .ko.* stripped)
-			 * at the time of module-init-tools 3.4.
-			 * kmod v.12 uses module name, i.e., s/-/_/g.
-			 */
-			printf("alias %s %s\n",
-				(char*)llist_pop(&m->aliases),
-				m->modname);
+	index_dump(CONFIG_DEFAULT_DEPMOD_FILE, 1);
+
+	if (ENABLE_FEATURE_MODUTILS_ALIAS) {
+		index_init("modules.alias");
+		moddb_foreach_module(&modules, m, i) {
+			while (m->aliases) {
+				/*
+				 * Last word used to be a basename
+				 * (filename with path and .ko.* stripped)
+				 * at the time of module-init-tools 3.4.
+				 * kmod v.12 uses module name, i.e., s/-/_/g.
+				 */
+				index_add((char*)llist_pop(&m->aliases), m->modname, "alias ");
+			}
 		}
+		index_dump("modules.alias", 0);
 	}
-#endif
-#if ENABLE_FEATURE_MODUTILS_SYMBOLS
-	if (!(option_mask32 & OPT_n))
-		xfreopen_write("modules.symbols", stdout);
-	moddb_foreach_module(&modules, m, i) {
-		while (m->symbols) {
-			printf("alias symbol:%s %s\n",
-				(char*)llist_pop(&m->symbols),
-				m->modname);
+	if (ENABLE_FEATURE_MODUTILS_SYMBOLS) {
+		index_init("modules.symbols");
+		moddb_foreach_module(&modules, m, i) {
+			while (m->symbols) {
+				index_add((char*)llist_pop(&m->symbols), m->modname, "alias ");
+			}
+		}
+		index_dump("modules.symbols", 0);
+	}
+	if (ENABLE_FEATURE_MODUTILS_BIN) {
+		char line[PATH_MAX], modname[MODULE_NAME_LEN];
+		FILE *in;
+
+		index_init(NULL);
+		in = xfopen_for_read("modules.builtin");
+		while (fgets(line, sizeof(line), in) != NULL) {
+			filename2modname(line, modname);
+			index_add(modname, (char *) "", 0);
 		}
+		fclose(in);
+		index_dump("modules.builtin", 0);
 	}
-#endif
 
 	if (ENABLE_FEATURE_CLEAN_UP)
 		moddb_free(&modules);
diff --git a/modutils/modprobe.c b/modutils/modprobe.c
index 59f6d54f3..0a398a60f 100644
--- a/modutils/modprobe.c
+++ b/modutils/modprobe.c
@@ -192,21 +192,6 @@ struct globals {
 
 static int read_config(const char *path);
 
-static char *gather_options_str(char *opts, const char *append)
-{
-	/* Speed-optimized. We call gather_options_str many times. */
-	if (append) {
-		if (opts == NULL) {
-			opts = xstrdup(append);
-		} else {
-			int optlen = strlen(opts);
-			opts = xrealloc(opts, optlen + strlen(append) + 2);
-			sprintf(opts + optlen, " %s", append);
-		}
-	}
-	return opts;
-}
-
 static struct module_entry *get_or_add_modentry(const char *module)
 {
 	return moddb_get_or_create(&G.db, module);
diff --git a/modutils/modutils.c b/modutils/modutils.c
index 6f7cd9721..257089af4 100644
--- a/modutils/modutils.c
+++ b/modutils/modutils.c
@@ -66,6 +66,21 @@ void FAST_FUNC moddb_free(module_db *db)
 	}
 }
 
+char * FAST_FUNC gather_options_str(char *opts, const char *append)
+{
+	/* Speed-optimized. We call gather_options_str many times. */
+	if (append) {
+		if (opts == NULL) {
+			opts = xstrdup(append);
+		} else {
+			int optlen = strlen(opts);
+			opts = xrealloc(opts, optlen + strlen(append) + 2);
+			sprintf(opts + optlen, " %s", append);
+		}
+	}
+	return opts;
+}
+
 void FAST_FUNC replace(char *s, char what, char with)
 {
 	while (*s) {
@@ -75,6 +90,22 @@ void FAST_FUNC replace(char *s, char what, char with)
 	}
 }
 
+char* FAST_FUNC replace_underscores(char *s)
+{
+	int i;
+	for (i = 0; s[i]; i++) {
+		switch (s[i]) {
+		case '-':
+			s[i] = '_';
+			break;
+		case '[':
+			i += strcspn(&s[i], "]");
+			break;
+		}
+	}
+	return s;
+}
+
 int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
 {
 	char *tok;
diff --git a/modutils/modutils.h b/modutils/modutils.h
index 4a702e97c..73e816028 100644
--- a/modutils/modutils.h
+++ b/modutils/modutils.h
@@ -18,6 +18,20 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 #define MODULE_NAME_LEN 256
 #define MODULE_HASH_SIZE 256
 
+/* .bin index format definitions */
+#define INDEX_MAGIC 0xB007F457
+#define INDEX_VERSION_MAJOR 0x0002
+#define INDEX_VERSION_MINOR 0x0001
+#define INDEX_VERSION ((INDEX_VERSION_MAJOR<<16)|INDEX_VERSION_MINOR)
+
+enum node_offset {
+	INDEX_NODE_FLAGS	= 0xF0000000, /* Flags in high nibble */
+	INDEX_NODE_PREFIX	= 0x80000000,
+	INDEX_NODE_VALUES	= 0x40000000,
+	INDEX_NODE_CHILDS	= 0x20000000,
+	INDEX_NODE_MASK		= 0x0FFFFFFF, /* Offset value */
+};
+
 typedef struct module_entry {
 	struct module_entry *next;
 	char *name, *modname;
@@ -47,7 +61,9 @@ module_entry *moddb_get(module_db *db, const char *s) FAST_FUNC;
 module_entry *moddb_get_or_create(module_db *db, const char *s) FAST_FUNC;
 void moddb_free(module_db *db) FAST_FUNC;
 
+char *gather_options_str(char *opts, const char *append) FAST_FUNC;
 void replace(char *s, char what, char with) FAST_FUNC;
+char *replace_underscores(char *s) FAST_FUNC;
 int string_to_llist(char *string, llist_t **llist, const char *delim) FAST_FUNC;
 char *filename2modname(const char *filename, char *modname) FAST_FUNC;
 #if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS