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>
10#include <limits.h>
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
40struct md4_ctx {
41	uint32_t hash[MD4_HASH_WORDS];
42	uint32_t block[MD4_BLOCK_WORDS];
43	uint64_t byte_count;
44};
45
46static inline uint32_t lshift(uint32_t x, unsigned int s)
47{
48	x &= 0xFFFFFFFF;
49	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
50}
51
52static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
53{
54	return (x & y) | ((~x) & z);
55}
56
57static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
58{
59	return (x & y) | (x & z) | (y & z);
60}
61
62static 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 */
72static 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
80static 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
88static 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
154static inline void md4_transform_helper(struct md4_ctx *ctx)
155{
156	le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
157	md4_transform(ctx->hash, ctx->block);
158}
159
160static 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
169static 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
199static 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, ARRAY_SIZE(mctx->hash));
220
221	snprintf(out, len, "%08X%08X%08X%08X",
222		 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
223}
224
225static inline void add_char(unsigned char c, struct md4_ctx *md)
226{
227	md4_update(md, &c, 1);
228}
229
230static 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
244static 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 */
256static int parse_file(const char *fname, struct md4_ctx *md)
257{
258	char *file;
259	unsigned long i, len;
260
261	file = read_text_file(fname);
262	len = strlen(file);
263
264	for (i = 0; i < len; i++) {
265		/* Collapse and ignore \ and CR. */
266		if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
267			i++;
268			continue;
269		}
270
271		/* Ignore whitespace */
272		if (isspace(file[i]))
273			continue;
274
275		/* Handle strings as whole units */
276		if (file[i] == '"') {
277			i += parse_string(file+i, len - i, md);
278			continue;
279		}
280
281		/* Comments: ignore */
282		if (file[i] == '/' && file[i+1] == '*') {
283			i += parse_comment(file+i, len - i);
284			continue;
285		}
286
287		add_char(file[i], md);
288	}
289	free(file);
290	return 1;
291}
292/* Check whether the file is a static library or not */
293static bool is_static_library(const char *objfile)
294{
295	int len = strlen(objfile);
296
297	return objfile[len - 2] == '.' && objfile[len - 1] == 'a';
298}
299
300/* We have dir/file.o.  Open dir/.file.o.cmd, look for source_ and deps_ line
301 * to figure out source files. */
302static int parse_source_files(const char *objfile, struct md4_ctx *md)
303{
304	char *cmd, *file, *line, *dir, *pos;
305	const char *base;
306	int dirlen, ret = 0, check_files = 0;
307
308	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
309
310	base = strrchr(objfile, '/');
311	if (base) {
312		base++;
313		dirlen = base - objfile;
314		sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
315	} else {
316		dirlen = 0;
317		sprintf(cmd, ".%s.cmd", objfile);
318	}
319	dir = NOFAIL(malloc(dirlen + 1));
320	strncpy(dir, objfile, dirlen);
321	dir[dirlen] = '\0';
322
323	file = read_text_file(cmd);
324
325	pos = file;
326
327	/* Sum all files in the same dir or subdirs. */
328	while ((line = get_line(&pos))) {
329		char* p;
330
331		/* trim the leading spaces away */
332		while (isspace(*line))
333			line++;
334		p = line;
335
336		if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
337			p = strrchr(line, ' ');
338			if (!p) {
339				warn("malformed line: %s\n", line);
340				goto out_file;
341			}
342			p++;
343			if (!parse_file(p, md)) {
344				warn("could not open %s: %s\n",
345				     p, strerror(errno));
346				goto out_file;
347			}
348			continue;
349		}
350		if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
351			check_files = 1;
352			continue;
353		}
354		if (!check_files)
355			continue;
356
357		/* Continue until line does not end with '\' */
358		if ( *(p + strlen(p)-1) != '\\')
359			break;
360		/* Terminate line at first space, to get rid of final ' \' */
361		while (*p) {
362			if (isspace(*p)) {
363				*p = '\0';
364				break;
365			}
366			p++;
367		}
368
369		/* Check if this file is in same dir as objfile */
370		if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
371			if (!parse_file(line, md)) {
372				warn("could not open %s: %s\n",
373				     line, strerror(errno));
374				goto out_file;
375			}
376
377		}
378
379	}
380
381	/* Everyone parsed OK */
382	ret = 1;
383out_file:
384	free(file);
385	free(dir);
386	free(cmd);
387	return ret;
388}
389
390/* Calc and record src checksum. */
391void get_src_version(const char *modname, char sum[], unsigned sumlen)
392{
393	char *buf;
394	struct md4_ctx md;
395	char *fname;
396	char filelist[PATH_MAX + 1];
397
398	/* objects for a module are listed in the first line of *.mod file. */
399	snprintf(filelist, sizeof(filelist), "%s.mod", modname);
400
401	buf = read_text_file(filelist);
402
403	md4_init(&md);
404	while ((fname = strsep(&buf, "\n"))) {
405		if (!*fname)
406			continue;
407		if (!(is_static_library(fname)) &&
408				!parse_source_files(fname, &md))
409			goto free;
410	}
411
412	md4_final_ascii(&md, sum, sumlen);
413free:
414	free(buf);
415}
416