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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;

}

/* 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/config.h \

                    $(wildcard include/config/h.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 (!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);

}