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#include <netinet/in.h>
#ifdef __sun__
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include "modpost.h"

/*
 * Stolen form Cryptographic API.
 *
 * MD4 Message Digest Algorithm (RFC1320).
 *
 * Implementation derived from Andrew Tridgell and Steve French's
 * CIFS MD4 implementation, and the cryptoapi implementation
 * originally based on the public domain implementation written
 * by Colin Plumb in 1993.
 *
 * Copyright (c) Andrew Tridgell 1997-1998.
 * Modified by Steve French (sfrench@us.ibm.com) 2002
 * Copyright (c) Cryptoapi developers.
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */
#define MD4_DIGEST_SIZE		16
#define MD4_HMAC_BLOCK_SIZE	64
#define MD4_BLOCK_WORDS		16
#define MD4_HASH_WORDS		4

struct md4_ctx {
	uint32_t hash[MD4_HASH_WORDS];
	uint32_t block[MD4_BLOCK_WORDS];
	uint64_t byte_count;
};

static inline uint32_t lshift(uint32_t x, unsigned int s)
{
	x &= 0xFFFFFFFF;
	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
}

static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
{
	return (x & y) | ((~x) & z);
}

static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
{
	return (x & y) | (x & z) | (y & z);
}

static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
{
	return x ^ y ^ z;
}

#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))

/* XXX: this stuff can be optimized */
static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
{
	while (words--) {
		*buf = ntohl(*buf);
		buf++;
	}
}

static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
{
	while (words--) {
		*buf = htonl(*buf);
		buf++;
	}
}

static void md4_transform(uint32_t *hash, uint32_t const *in)
{
	uint32_t a, b, c, d;

	a = hash[0];
	b = hash[1];
	c = hash[2];
	d = hash[3];

	ROUND1(a, b, c, d, in[0], 3);
	ROUND1(d, a, b, c, in[1], 7);
	ROUND1(c, d, a, b, in[2], 11);
	ROUND1(b, c, d, a, in[3], 19);
	ROUND1(a, b, c, d, in[4], 3);
	ROUND1(d, a, b, c, in[5], 7);
	ROUND1(c, d, a, b, in[6], 11);
	ROUND1(b, c, d, a, in[7], 19);
	ROUND1(a, b, c, d, in[8], 3);
	ROUND1(d, a, b, c, in[9], 7);
	ROUND1(c, d, a, b, in[10], 11);
	ROUND1(b, c, d, a, in[11], 19);
	ROUND1(a, b, c, d, in[12], 3);
	ROUND1(d, a, b, c, in[13], 7);
	ROUND1(c, d, a, b, in[14], 11);
	ROUND1(b, c, d, a, in[15], 19);

	ROUND2(a, b, c, d,in[ 0], 3);
	ROUND2(d, a, b, c, in[4], 5);
	ROUND2(c, d, a, b, in[8], 9);
	ROUND2(b, c, d, a, in[12], 13);
	ROUND2(a, b, c, d, in[1], 3);
	ROUND2(d, a, b, c, in[5], 5);
	ROUND2(c, d, a, b, in[9], 9);
	ROUND2(b, c, d, a, in[13], 13);
	ROUND2(a, b, c, d, in[2], 3);
	ROUND2(d, a, b, c, in[6], 5);
	ROUND2(c, d, a, b, in[10], 9);
	ROUND2(b, c, d, a, in[14], 13);
	ROUND2(a, b, c, d, in[3], 3);
	ROUND2(d, a, b, c, in[7], 5);
	ROUND2(c, d, a, b, in[11], 9);
	ROUND2(b, c, d, a, in[15], 13);

	ROUND3(a, b, c, d,in[ 0], 3);
	ROUND3(d, a, b, c, in[8], 9);
	ROUND3(c, d, a, b, in[4], 11);
	ROUND3(b, c, d, a, in[12], 15);
	ROUND3(a, b, c, d, in[2], 3);
	ROUND3(d, a, b, c, in[10], 9);
	ROUND3(c, d, a, b, in[6], 11);
	ROUND3(b, c, d, a, in[14], 15);
	ROUND3(a, b, c, d, in[1], 3);
	ROUND3(d, a, b, c, in[9], 9);
	ROUND3(c, d, a, b, in[5], 11);
	ROUND3(b, c, d, a, in[13], 15);
	ROUND3(a, b, c, d, in[3], 3);
	ROUND3(d, a, b, c, in[11], 9);
	ROUND3(c, d, a, b, in[7], 11);
	ROUND3(b, c, d, a, in[15], 15);

	hash[0] += a;
	hash[1] += b;
	hash[2] += c;
	hash[3] += d;
}

static inline void md4_transform_helper(struct md4_ctx *ctx)
{
	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
	md4_transform(ctx->hash, ctx->block);
}

static void md4_init(struct md4_ctx *mctx)
{
	mctx->hash[0] = 0x67452301;
	mctx->hash[1] = 0xefcdab89;
	mctx->hash[2] = 0x98badcfe;
	mctx->hash[3] = 0x10325476;
	mctx->byte_count = 0;
}

static void md4_update(struct md4_ctx *mctx,
		       const unsigned char *data, unsigned int len)
{
	const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);

	mctx->byte_count += len;

	if (avail > len) {
		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
		       data, len);
		return;
	}

	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	       data, avail);

	md4_transform_helper(mctx);
	data += avail;
	len -= avail;

	while (len >= sizeof(mctx->block)) {
		memcpy(mctx->block, data, sizeof(mctx->block));
		md4_transform_helper(mctx);
		data += sizeof(mctx->block);
		len -= sizeof(mctx->block);
	}

	memcpy(mctx->block, data, len);
}

static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
{
	const unsigned int offset = mctx->byte_count & 0x3f;
	char *p = (char *)mctx->block + offset;
	int padding = 56 - (offset + 1);

	*p++ = 0x80;
	if (padding < 0) {
		memset(p, 0x00, padding + sizeof (uint64_t));
		md4_transform_helper(mctx);
		p = (char *)mctx->block;
		padding = 56;
	}

	memset(p, 0, padding);
	mctx->block[14] = mctx->byte_count << 3;
	mctx->block[15] = mctx->byte_count >> 29;
	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
			  sizeof(uint64_t)) / sizeof(uint32_t));
	md4_transform(mctx->hash, mctx->block);
	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));

	snprintf(out, len, "%08X%08X%08X%08X",
		 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
}

static inline void add_char(unsigned char c, struct md4_ctx *md)
{
	md4_update(md, &c, 1);
}

static int parse_string(const char *file, unsigned long len,
			struct md4_ctx *md)
{
	unsigned long i;

	add_char(file[0], md);
	for (i = 1; i < len; i++) {
		add_char(file[i], md);
		if (file[i] == '"' && file[i-1] != '\\')
			break;
	}
	return i;
}

static int parse_comment(const char *file, unsigned long len)
{
	unsigned long i;

	for (i = 2; i < len; i++) {
		if (file[i-1] == '*' && file[i] == '/')
			break;
	}
	return i;
}

/* FIXME: Handle .s files differently (eg. # starts comments) --RR */
static int parse_file(const char *fname, struct md4_ctx *md)
{
	char *file;
	unsigned long i, len;

	file = grab_file(fname, &len);
	if (!file)
		return 0;

	for (i = 0; i < len; i++) {
		/* Collapse and ignore \ and CR. */
		if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
			i++;
			continue;
		}

		/* Ignore whitespace */
		if (isspace(file[i]))
			continue;

		/* Handle strings as whole units */
		if (file[i] == '"') {
			i += parse_string(file+i, len - i, md);
			continue;
		}

		/* Comments: ignore */
		if (file[i] == '/' && file[i+1] == '*') {
			i += parse_comment(file+i, len - i);
			continue;
		}

		add_char(file[i], md);
	}
	release_file(file, len);
	return 1;
}
/* Check whether the file is a static library or not */
static int is_static_library(const char *objfile)
{
	int len = strlen(objfile);
	if (objfile[len - 2] == '.' && objfile[len - 1] == 'a')
		return 1;
	else
		return 0;
}

/* We have dir/file.o.  Open dir/.file.o.cmd, look for source_ and deps_ line
 * to figure out source files. */
static int parse_source_files(const char *objfile, struct md4_ctx *md)
{
	char *cmd, *file, *line, *dir;
	const char *base;
	unsigned long flen, pos = 0;
	int dirlen, ret = 0, check_files = 0;

	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));

	base = strrchr(objfile, '/');
	if (base) {
		base++;
		dirlen = base - objfile;
		sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
	} else {
		dirlen = 0;
		sprintf(cmd, ".%s.cmd", objfile);
	}
	dir = NOFAIL(malloc(dirlen + 1));
	strncpy(dir, objfile, dirlen);
	dir[dirlen] = '\0';

	file = grab_file(cmd, &flen);
	if (!file) {
		warn("could not find %s for %s\n", cmd, objfile);
		goto out;
	}

	/* There will be a line like so:
		deps_drivers/net/dummy.o := \
		  drivers/net/dummy.c \
		    $(wildcard include/config/net/fastroute.h) \
		  include/linux/module.h \

	   Sum all files in the same dir or subdirs.
	*/
	while ((line = get_next_line(&pos, file, flen)) != NULL) {
		char* p = line;

		if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
			p = strrchr(line, ' ');
			if (!p) {
				warn("malformed line: %s\n", line);
				goto out_file;
			}
			p++;
			if (!parse_file(p, md)) {
				warn("could not open %s: %s\n",
				     p, strerror(errno));
				goto out_file;
			}
			continue;
		}
		if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
			check_files = 1;
			continue;
		}
		if (!check_files)
			continue;

		/* Continue until line does not end with '\' */
		if ( *(p + strlen(p)-1) != '\\')
			break;
		/* Terminate line at first space, to get rid of final ' \' */
		while (*p) {
			if (isspace(*p)) {
				*p = '\0';
				break;
			}
			p++;
		}

		/* Check if this file is in same dir as objfile */
		if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
			if (!parse_file(line, md)) {
				warn("could not open %s: %s\n",
				     line, strerror(errno));
				goto out_file;
			}

		}

	}

	/* Everyone parsed OK */
	ret = 1;
out_file:
	release_file(file, flen);
out:
	free(dir);
	free(cmd);
	return ret;
}

/* Calc and record src checksum. */
void get_src_version(const char *modname, char sum[], unsigned sumlen)
{
	void *file;
	unsigned long len;
	struct md4_ctx md;
	char *sources, *end, *fname;
	const char *basename;
	char filelist[PATH_MAX + 1];
	char *modverdir = getenv("MODVERDIR");

	if (!modverdir)
		modverdir = ".";

	/* Source files for module are in .tmp_versions/modname.mod,
	   after the first line. */
	if (strrchr(modname, '/'))
		basename = strrchr(modname, '/') + 1;
	else
		basename = modname;
	snprintf(filelist, sizeof(filelist), "%s/%.*s.mod", modverdir,
		(int) strlen(basename) - 2, basename);

	file = grab_file(filelist, &len);
	if (!file)
		/* not a module or .mod file missing - ignore */
		return;

	sources = strchr(file, '\n');
	if (!sources) {
		warn("malformed versions file for %s\n", modname);
		goto release;
	}

	sources++;
	end = strchr(sources, '\n');
	if (!end) {
		warn("bad ending versions file for %s\n", modname);
		goto release;
	}
	*end = '\0';

	md4_init(&md);
	while ((fname = strsep(&sources, " ")) != NULL) {
		if (!*fname)
			continue;
		if (!(is_static_library(fname)) &&
				!parse_source_files(fname, &md))
			goto release;
	}

	md4_final_ascii(&md, sum, sumlen);
release:
	release_file(file, len);
}

static void write_version(const char *filename, const char *sum,
			  unsigned long offset)
{
	int fd;

	fd = open(filename, O_RDWR);
	if (fd < 0) {
		warn("changing sum in %s failed: %s\n",
			filename, strerror(errno));
		return;
	}

	if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
		warn("changing sum in %s:%lu failed: %s\n",
			filename, offset, strerror(errno));
		goto out;
	}

	if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
		warn("writing sum in %s failed: %s\n",
			filename, strerror(errno));
		goto out;
	}
out:
	close(fd);
}

static int strip_rcs_crap(char *version)
{
	unsigned int len, full_len;

	if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
		return 0;

	/* Space for version string follows. */
	full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;

	/* Move string to start with version number: prefix will be
	 * $Revision$ or $Revision: */
	len = strlen("$Revision");
	if (version[len] == ':' || version[len] == '$')
		len++;
	while (isspace(version[len]))
		len++;
	memmove(version, version+len, full_len-len);
	full_len -= len;

	/* Preserve up to next whitespace. */
	len = 0;
	while (version[len] && !isspace(version[len]))
		len++;
	memmove(version + len, version + strlen(version),
		full_len - strlen(version));
	return 1;
}

/* Clean up RCS-style version numbers. */
void maybe_frob_rcs_version(const char *modfilename,
			    char *version,
			    void *modinfo,
			    unsigned long version_offset)
{
	if (strip_rcs_crap(version))
		write_version(modfilename, version, version_offset);
}

Filemanager

Name Type Size Permission Actions
.devicetable-offsets.s.cmd File 6.54 KB 0644
.elfconfig.h.cmd File 104 B 0644
.empty.o.cmd File 3.17 KB 0644
.file2alias.o.cmd File 4.71 KB 0644
.mk_elfconfig.cmd File 3.65 KB 0644
.modpost.cmd File 129 B 0644
.modpost.o.cmd File 6.06 KB 0644
.sumversion.o.cmd File 5.68 KB 0644
Makefile File 826 B 0644
devicetable-offsets.c File 6.1 KB 0644
devicetable-offsets.h File 13.21 KB 0644
devicetable-offsets.s File 51.18 KB 0644
elfconfig.h File 136 B 0644
empty.c File 54 B 0644
empty.o File 936 B 0644
file2alias.c File 39.61 KB 0644
file2alias.o File 37.99 KB 0644
mk_elfconfig File 8.38 KB 0755
mk_elfconfig.c File 1.24 KB 0644
modpost File 86.5 KB 0755
modpost.c File 67.09 KB 0644
modpost.h File 4.85 KB 0644
modpost.o File 61.88 KB 0644
sumversion.c File 11.93 KB 0644
sumversion.o File 10.73 KB 0644