[net-next-2.6.git] / scripts / mod / sumversion.c

#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 deps_ line to
 * figure out source file. */
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, "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;
	sprintf(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);
}
Commit	Line	Data
1da177e4 LT	1	#include <netinet/in.h>
	2	#ifdef __sun__
	3	#include <inttypes.h>
	4	#else
	5	#include <stdint.h>
	6	#endif
	7	#include <ctype.h>
	8	#include <errno.h>
	9	#include <string.h>
fc31c771	10	#include <limits.h>
1da177e4 LT	11	#include "modpost.h"
	12
	13	/*
	14	* Stolen form Cryptographic API.
	15	*
	16	* MD4 Message Digest Algorithm (RFC1320).
	17	*
	18	* Implementation derived from Andrew Tridgell and Steve French's
	19	* CIFS MD4 implementation, and the cryptoapi implementation
	20	* originally based on the public domain implementation written
	21	* by Colin Plumb in 1993.
	22	*
	23	* Copyright (c) Andrew Tridgell 1997-1998.
	24	* Modified by Steve French (sfrench@us.ibm.com) 2002
	25	* Copyright (c) Cryptoapi developers.
	26	* Copyright (c) 2002 David S. Miller (davem@redhat.com)
	27	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	28	*
	29	* This program is free software; you can redistribute it and/or modify
	30	* it under the terms of the GNU General Public License as published by
	31	* the Free Software Foundation; either version 2 of the License, or
	32	* (at your option) any later version.
	33	*
	34	*/
	35	#define MD4_DIGEST_SIZE 16
	36	#define MD4_HMAC_BLOCK_SIZE 64
	37	#define MD4_BLOCK_WORDS 16
	38	#define MD4_HASH_WORDS 4
	39
	40	struct md4_ctx {
	41	uint32_t hash[MD4_HASH_WORDS];
	42	uint32_t block[MD4_BLOCK_WORDS];
	43	uint64_t byte_count;
	44	};
	45
	46	static inline uint32_t lshift(uint32_t x, unsigned int s)
	47	{
	48	x &= 0xFFFFFFFF;
	49	return ((x << s) & 0xFFFFFFFF) \| (x >> (32 - s));
	50	}
	51
	52	static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
	53	{
	54	return (x & y) \| ((~x) & z);
	55	}
	56
	57	static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
	58	{
	59	return (x & y) \| (x & z) \| (y & z);
	60	}
	61
	62	static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
	63	{
	64	return x ^ y ^ z;
	65	}
	66
	67	#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
	68	#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
	69	#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
	70
	71	/* XXX: this stuff can be optimized */
	72	static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
	73	{
	74	while (words--) {
75	buf = ntohl(buf);
76	buf++;
77	}
78	}
79
80	static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
81	{
82	while (words--) {
83	buf = htonl(buf);
84	buf++;
85	}
86	}
87
88	static void md4_transform(uint32_t hash, uint32_t const in)
89	{
90	uint32_t a, b, c, d;
91
92	a = hash[0];
93	b = hash[1];
94	c = hash[2];
95	d = hash[3];
96
97	ROUND1(a, b, c, d, in[0], 3);
98	ROUND1(d, a, b, c, in[1], 7);
99	ROUND1(c, d, a, b, in[2], 11);
100	ROUND1(b, c, d, a, in[3], 19);
101	ROUND1(a, b, c, d, in[4], 3);
102	ROUND1(d, a, b, c, in[5], 7);
103	ROUND1(c, d, a, b, in[6], 11);
104	ROUND1(b, c, d, a, in[7], 19);
105	ROUND1(a, b, c, d, in[8], 3);
106	ROUND1(d, a, b, c, in[9], 7);
107	ROUND1(c, d, a, b, in[10], 11);
108	ROUND1(b, c, d, a, in[11], 19);
109	ROUND1(a, b, c, d, in[12], 3);
110	ROUND1(d, a, b, c, in[13], 7);
111	ROUND1(c, d, a, b, in[14], 11);
112	ROUND1(b, c, d, a, in[15], 19);
113
114	ROUND2(a, b, c, d,in[ 0], 3);
115	ROUND2(d, a, b, c, in[4], 5);
116	ROUND2(c, d, a, b, in[8], 9);
117	ROUND2(b, c, d, a, in[12], 13);
118	ROUND2(a, b, c, d, in[1], 3);
119	ROUND2(d, a, b, c, in[5], 5);
120	ROUND2(c, d, a, b, in[9], 9);
121	ROUND2(b, c, d, a, in[13], 13);
122	ROUND2(a, b, c, d, in[2], 3);
123	ROUND2(d, a, b, c, in[6], 5);
124	ROUND2(c, d, a, b, in[10], 9);
125	ROUND2(b, c, d, a, in[14], 13);
126	ROUND2(a, b, c, d, in[3], 3);
127	ROUND2(d, a, b, c, in[7], 5);
128	ROUND2(c, d, a, b, in[11], 9);
129	ROUND2(b, c, d, a, in[15], 13);
130
131	ROUND3(a, b, c, d,in[ 0], 3);
132	ROUND3(d, a, b, c, in[8], 9);
133	ROUND3(c, d, a, b, in[4], 11);
134	ROUND3(b, c, d, a, in[12], 15);
135	ROUND3(a, b, c, d, in[2], 3);
136	ROUND3(d, a, b, c, in[10], 9);
137	ROUND3(c, d, a, b, in[6], 11);
138	ROUND3(b, c, d, a, in[14], 15);
139	ROUND3(a, b, c, d, in[1], 3);
140	ROUND3(d, a, b, c, in[9], 9);
141	ROUND3(c, d, a, b, in[5], 11);
142	ROUND3(b, c, d, a, in[13], 15);
143	ROUND3(a, b, c, d, in[3], 3);
144	ROUND3(d, a, b, c, in[11], 9);
145	ROUND3(c, d, a, b, in[7], 11);
146	ROUND3(b, c, d, a, in[15], 15);
147
148	hash[0] += a;
149	hash[1] += b;
150	hash[2] += c;
151	hash[3] += d;
152	}
153
154	static inline void md4_transform_helper(struct md4_ctx *ctx)
155	{
156	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
157	md4_transform(ctx->hash, ctx->block);
158	}
159
160	static void md4_init(struct md4_ctx *mctx)
161	{
162	mctx->hash[0] = 0x67452301;
163	mctx->hash[1] = 0xefcdab89;
164	mctx->hash[2] = 0x98badcfe;
165	mctx->hash[3] = 0x10325476;
166	mctx->byte_count = 0;
167	}
168
169	static void md4_update(struct md4_ctx *mctx,
170	const unsigned char *data, unsigned int len)
171	{
172	const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
173
174	mctx->byte_count += len;
175
176	if (avail > len) {
177	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
178	data, len);
179	return;
180	}
181
182	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
183	data, avail);
184
185	md4_transform_helper(mctx);
186	data += avail;
187	len -= avail;
188
189	while (len >= sizeof(mctx->block)) {
190	memcpy(mctx->block, data, sizeof(mctx->block));
191	md4_transform_helper(mctx);
192	data += sizeof(mctx->block);
193	len -= sizeof(mctx->block);
194	}
195
196	memcpy(mctx->block, data, len);
197	}
198
199	static void md4_final_ascii(struct md4_ctx mctx, char out, unsigned int len)
200	{
201	const unsigned int offset = mctx->byte_count & 0x3f;
202	char p = (char )mctx->block + offset;
203	int padding = 56 - (offset + 1);
204
205	*p++ = 0x80;
206	if (padding < 0) {
207	memset(p, 0x00, padding + sizeof (uint64_t));
208	md4_transform_helper(mctx);
209	p = (char *)mctx->block;
210	padding = 56;
211	}
212
213	memset(p, 0, padding);
214	mctx->block[14] = mctx->byte_count << 3;
215	mctx->block[15] = mctx->byte_count >> 29;
216	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
217	sizeof(uint64_t)) / sizeof(uint32_t));
218	md4_transform(mctx->hash, mctx->block);
219	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
220
221	snprintf(out, len, "%08X%08X%08X%08X",
222	mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
223	}
224
225	static inline void add_char(unsigned char c, struct md4_ctx *md)
226	{
227	md4_update(md, &c, 1);
228	}
229
230	static int parse_string(const char *file, unsigned long len,
231	struct md4_ctx *md)
232	{
233	unsigned long i;
234
235	add_char(file[0], md);
236	for (i = 1; i < len; i++) {
237	add_char(file[i], md);
238	if (file[i] == '"' && file[i-1] != '\\')
239	break;
240	}
241	return i;
242	}
243
244	static int parse_comment(const char *file, unsigned long len)
245	{
246	unsigned long i;
247
248	for (i = 2; i < len; i++) {
249	if (file[i-1] == '*' && file[i] == '/')
250	break;
251	}
252	return i;
253	}
254
255	/* FIXME: Handle .s files differently (eg. # starts comments) --RR */
61d9cdf2	256	static int parse_file(const char fname, struct md4_ctx md)
1da177e4	257	{
61d9cdf2	258	char *file;
1da177e4 LT	259	unsigned long i, len;
	260
	261	file = grab_file(fname, &len);
	262	if (!file)
	263	return 0;
	264
	265	for (i = 0; i < len; i++) {
	266	/* Collapse and ignore \ and CR. */
	267	if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
	268	i++;
	269	continue;
	270	}
	271
	272	/* Ignore whitespace */
	273	if (isspace(file[i]))
	274	continue;
	275
	276	/* Handle strings as whole units */
	277	if (file[i] == '"') {
	278	i += parse_string(file+i, len - i, md);
	279	continue;
	280	}
	281
	282	/* Comments: ignore */
	283	if (file[i] == '/' && file[i+1] == '*') {
	284	i += parse_comment(file+i, len - i);
	285	continue;
	286	}
	287
	288	add_char(file[i], md);
	289	}
	290	release_file(file, len);
	291	return 1;
	292	}
e6e6733e AN	293	/* Check whether the file is a static library or not */
	294	static int is_static_library(const char *objfile)
	295	{
	296	int len = strlen(objfile);
	297	if (objfile[len - 2] == '.' && objfile[len - 1] == 'a')
	298	return 1;
	299	else
	300	return 0;
	301	}
1da177e4 LT	302
	303	/* We have dir/file.o. Open dir/.file.o.cmd, look for deps_ line to
	304	* figure out source file. */
	305	static int parse_source_files(const char objfile, struct md4_ctx md)
	306	{
	307	char cmd, file, line, dir;
	308	const char *base;
	309	unsigned long flen, pos = 0;
	310	int dirlen, ret = 0, check_files = 0;
	311
	312	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
	313
	314	base = strrchr(objfile, '/');
	315	if (base) {
	316	base++;
	317	dirlen = base - objfile;
	318	sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
	319	} else {
	320	dirlen = 0;
	321	sprintf(cmd, ".%s.cmd", objfile);
	322	}
	323	dir = NOFAIL(malloc(dirlen + 1));
	324	strncpy(dir, objfile, dirlen);
	325	dir[dirlen] = '\0';
	326
	327	file = grab_file(cmd, &flen);
	328	if (!file) {
cb80514d	329	warn("could not find %s for %s\n", cmd, objfile);
1da177e4 LT	330	goto out;
	331	}
	332
	333	/* There will be a line like so:
	334	deps_drivers/net/dummy.o := \
	335	drivers/net/dummy.c \
	336	$(wildcard include/config/net/fastroute.h) \
1da177e4 LT	337	include/linux/module.h \
	338
	339	Sum all files in the same dir or subdirs.
	340	*/
	341	while ((line = get_next_line(&pos, file, flen)) != NULL) {
61d9cdf2	342	char* p = line;
1da177e4 LT	343	if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
	344	check_files = 1;
	345	continue;
	346	}
	347	if (!check_files)
	348	continue;
	349
	350	/* Continue until line does not end with '\' */
	351	if ( *(p + strlen(p)-1) != '\\')
	352	break;
	353	/* Terminate line at first space, to get rid of final ' \' */
	354	while (*p) {
	355	if (isspace(*p)) {
	356	*p = '\0';
	357	break;
	358	}
	359	p++;
	360	}
	361
	362	/* Check if this file is in same dir as objfile */
	363	if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
	364	if (!parse_file(line, md)) {
cb80514d SR	365	warn("could not open %s: %s\n",
cb80514d SR	366	line, strerror(errno));
1da177e4 LT	367	goto out_file;
	368	}
	369
	370	}
	371
	372	}
	373
	374	/* Everyone parsed OK */
	375	ret = 1;
	376	out_file:
	377	release_file(file, flen);
	378	out:
	379	free(dir);
	380	free(cmd);
	381	return ret;
	382	}
	383
	384	/* Calc and record src checksum. */
	385	void get_src_version(const char *modname, char sum[], unsigned sumlen)
	386	{
	387	void *file;
	388	unsigned long len;
	389	struct md4_ctx md;
	390	char sources, end, *fname;
	391	const char *basename;
41370d3b SR	392	char filelist[PATH_MAX + 1];
	393	char *modverdir = getenv("MODVERDIR");
	394
	395	if (!modverdir)
	396	modverdir = ".";
1da177e4 LT	397
	398	/* Source files for module are in .tmp_versions/modname.mod,
	399	after the first line. */
	400	if (strrchr(modname, '/'))
	401	basename = strrchr(modname, '/') + 1;
	402	else
	403	basename = modname;
41370d3b	404	sprintf(filelist, "%s/%.*s.mod", modverdir,
1da177e4 LT	405	(int) strlen(basename) - 2, basename);
	406
	407	file = grab_file(filelist, &len);
4be40e22 SR	408	if (!file)
4be40e22 SR	409	/* not a module or .mod file missing - ignore */
1da177e4	410	return;
1da177e4 LT	411
	412	sources = strchr(file, '\n');
	413	if (!sources) {
cb80514d	414	warn("malformed versions file for %s\n", modname);
1da177e4 LT	415	goto release;
	416	}
	417
	418	sources++;
	419	end = strchr(sources, '\n');
	420	if (!end) {
cb80514d	421	warn("bad ending versions file for %s\n", modname);
1da177e4 LT	422	goto release;
	423	}
	424	*end = '\0';
	425
	426	md4_init(&md);
	427	while ((fname = strsep(&sources, " ")) != NULL) {
	428	if (!*fname)
	429	continue;
e6e6733e AN	430	if (!(is_static_library(fname)) &&
e6e6733e AN	431	!parse_source_files(fname, &md))
1da177e4 LT	432	goto release;
	433	}
	434
	435	md4_final_ascii(&md, sum, sumlen);
	436	release:
	437	release_file(file, len);
	438	}
	439
	440	static void write_version(const char filename, const char sum,
	441	unsigned long offset)
	442	{
	443	int fd;
	444
	445	fd = open(filename, O_RDWR);
	446	if (fd < 0) {
cb80514d	447	warn("changing sum in %s failed: %s\n",
1da177e4 LT	448	filename, strerror(errno));
	449	return;
	450	}
	451
	452	if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
cb80514d	453	warn("changing sum in %s:%lu failed: %s\n",
1da177e4 LT	454	filename, offset, strerror(errno));
	455	goto out;
	456	}
	457
	458	if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
cb80514d	459	warn("writing sum in %s failed: %s\n",
1da177e4 LT	460	filename, strerror(errno));
	461	goto out;
	462	}
	463	out:
	464	close(fd);
	465	}
	466
61d9cdf2	467	static int strip_rcs_crap(char *version)
1da177e4 LT	468	{
	469	unsigned int len, full_len;
	470
	471	if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
	472	return 0;
	473
	474	/* Space for version string follows. */
	475	full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
	476
	477	/* Move string to start with version number: prefix will be
	478	* $Revision$ or $Revision: */
	479	len = strlen("$Revision");
	480	if (version[len] == ':' \|\| version[len] == '$')
	481	len++;
	482	while (isspace(version[len]))
	483	len++;
	484	memmove(version, version+len, full_len-len);
	485	full_len -= len;
	486
	487	/* Preserve up to next whitespace. */
	488	len = 0;
	489	while (version[len] && !isspace(version[len]))
	490	len++;
	491	memmove(version + len, version + strlen(version),
	492	full_len - strlen(version));
	493	return 1;
	494	}
	495
	496	/* Clean up RCS-style version numbers. */
	497	void maybe_frob_rcs_version(const char *modfilename,
	498	char *version,
	499	void *modinfo,
	500	unsigned long version_offset)
	501	{
	502	if (strip_rcs_crap(version))
	503	write_version(modfilename, version, version_offset);
	504	}