*
* Copyright (C) 1996 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
- * Copyright (C) 2004-2015 Wayne Davison
+ * Copyright (C) 2004-2018 Wayne Davison
*
* 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
extern int checksum_seed;
extern int protocol_version;
extern int proper_seed_order;
+extern char *checksum_choice;
+
+#define CSUM_NONE 0
+#define CSUM_MD4_ARCHAIC 1
+#define CSUM_MD4_BUSTED 2
+#define CSUM_MD4_OLD 3
+#define CSUM_MD4 4
+#define CSUM_MD5 5
+
+int xfersum_type = 0; /* used for the file transfer checksums */
+int checksum_type = 0; /* used for the pre-transfer (--checksum) checksums */
+
+/* Returns 1 if --whole-file must be enabled. */
+int parse_checksum_choice(void)
+{
+ char *cp = checksum_choice ? strchr(checksum_choice, ',') : NULL;
+ if (cp) {
+ xfersum_type = parse_csum_name(checksum_choice, cp - checksum_choice);
+ checksum_type = parse_csum_name(cp+1, -1);
+ } else
+ xfersum_type = checksum_type = parse_csum_name(checksum_choice, -1);
+ return xfersum_type == CSUM_NONE;
+}
+
+int parse_csum_name(const char *name, int len)
+{
+ if (len < 0 && name)
+ len = strlen(name);
+
+ if (!name || (len == 4 && strncasecmp(name, "auto", 4) == 0)) {
+ if (protocol_version >= 30)
+ return CSUM_MD5;
+ if (protocol_version >= 27)
+ return CSUM_MD4_OLD;
+ if (protocol_version >= 21)
+ return CSUM_MD4_BUSTED;
+ return CSUM_MD4_ARCHAIC;
+ }
+ if (len == 3 && strncasecmp(name, "md4", 3) == 0)
+ return CSUM_MD4;
+ if (len == 3 && strncasecmp(name, "md5", 3) == 0)
+ return CSUM_MD5;
+ if (len == 4 && strncasecmp(name, "none", 4) == 0)
+ return CSUM_NONE;
+
+ rprintf(FERROR, "unknown checksum name: %s\n", name);
+ exit_cleanup(RERR_UNSUPPORTED);
+}
+
+int csum_len_for_type(int cst, BOOL flist_csum)
+{
+ switch (cst) {
+ case CSUM_NONE:
+ return 1;
+ case CSUM_MD4_ARCHAIC:
+ /* The oldest checksum code is rather weird: the file-list code only sent
+ * 2-byte checksums, but all other checksums were full MD4 length. */
+ return flist_csum ? 2 : MD4_DIGEST_LEN;
+ case CSUM_MD4:
+ case CSUM_MD4_OLD:
+ case CSUM_MD4_BUSTED:
+ return MD4_DIGEST_LEN;
+ case CSUM_MD5:
+ return MD5_DIGEST_LEN;
+ default: /* paranoia to prevent missing case values */
+ exit_cleanup(RERR_UNSUPPORTED);
+ }
+ return 0;
+}
+
+int canonical_checksum(int csum_type)
+{
+ return csum_type >= CSUM_MD4 ? 1 : 0;
+}
/*
a simple 32 bit checksum that can be upadted from either end
return (s1 & 0xffff) + (s2 << 16);
}
-
void get_checksum2(char *buf, int32 len, char *sum)
{
md_context m;
- if (protocol_version >= 30) {
+ switch (xfersum_type) {
+ case CSUM_MD5: {
uchar seedbuf[4];
md5_begin(&m);
if (proper_seed_order) {
}
}
md5_result(&m, (uchar *)sum);
- } else {
+ break;
+ }
+ case CSUM_MD4:
+ case CSUM_MD4_OLD:
+ case CSUM_MD4_BUSTED:
+ case CSUM_MD4_ARCHAIC: {
int32 i;
static char *buf1;
static int32 len1;
* are multiples of 64. This is fixed by calling mdfour_update()
* even when there are no more bytes.
*/
- if (len - i > 0 || protocol_version >= 27)
+ if (len - i > 0 || xfersum_type > CSUM_MD4_BUSTED)
mdfour_update(&m, (uchar *)(buf1+i), len-i);
mdfour_result(&m, (uchar *)sum);
+ break;
+ }
+ default: /* paranoia to prevent missing case values */
+ exit_cleanup(RERR_UNSUPPORTED);
}
}
buf = map_file(fd, len, MAX_MAP_SIZE, CSUM_CHUNK);
- if (protocol_version >= 30) {
+ switch (checksum_type) {
+ case CSUM_MD5:
md5_begin(&m);
for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
md5_update(&m, (uchar *)map_ptr(buf, i, remainder), remainder);
md5_result(&m, (uchar *)sum);
- } else {
+ break;
+ case CSUM_MD4:
+ case CSUM_MD4_OLD:
+ case CSUM_MD4_BUSTED:
+ case CSUM_MD4_ARCHAIC:
mdfour_begin(&m);
for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
* are multiples of 64. This is fixed by calling mdfour_update()
* even when there are no more bytes. */
remainder = (int32)(len - i);
- if (remainder > 0 || protocol_version >= 27)
+ if (remainder > 0 || checksum_type > CSUM_MD4_BUSTED)
mdfour_update(&m, (uchar *)map_ptr(buf, i, remainder), remainder);
mdfour_result(&m, (uchar *)sum);
+ break;
+ default:
+ rprintf(FERROR, "invalid checksum-choice for the --checksum option (%d)\n", checksum_type);
+ exit_cleanup(RERR_UNSUPPORTED);
}
close(fd);
static int32 sumresidue;
static md_context md;
+static int cursum_type;
-void sum_init(int seed)
+void sum_init(int csum_type, int seed)
{
char s[4];
- if (protocol_version >= 30)
+ if (csum_type < 0)
+ csum_type = parse_csum_name(NULL, 0);
+ cursum_type = csum_type;
+
+ switch (csum_type) {
+ case CSUM_MD5:
md5_begin(&md);
- else {
+ break;
+ case CSUM_MD4:
+ mdfour_begin(&md);
+ sumresidue = 0;
+ break;
+ case CSUM_MD4_OLD:
+ case CSUM_MD4_BUSTED:
+ case CSUM_MD4_ARCHAIC:
mdfour_begin(&md);
sumresidue = 0;
SIVAL(s, 0, seed);
sum_update(s, 4);
+ break;
+ case CSUM_NONE:
+ break;
+ default: /* paranoia to prevent missing case values */
+ exit_cleanup(RERR_UNSUPPORTED);
}
}
**/
void sum_update(const char *p, int32 len)
{
- if (protocol_version >= 30) {
+ switch (cursum_type) {
+ case CSUM_MD5:
md5_update(&md, (uchar *)p, len);
- return;
- }
+ break;
+ case CSUM_MD4:
+ case CSUM_MD4_OLD:
+ case CSUM_MD4_BUSTED:
+ case CSUM_MD4_ARCHAIC:
+ if (len + sumresidue < CSUM_CHUNK) {
+ memcpy(md.buffer + sumresidue, p, len);
+ sumresidue += len;
+ break;
+ }
- if (len + sumresidue < CSUM_CHUNK) {
- memcpy(md.buffer + sumresidue, p, len);
- sumresidue += len;
- return;
- }
+ if (sumresidue) {
+ int32 i = CSUM_CHUNK - sumresidue;
+ memcpy(md.buffer + sumresidue, p, i);
+ mdfour_update(&md, (uchar *)md.buffer, CSUM_CHUNK);
+ len -= i;
+ p += i;
+ }
- if (sumresidue) {
- int32 i = CSUM_CHUNK - sumresidue;
- memcpy(md.buffer + sumresidue, p, i);
- mdfour_update(&md, (uchar *)md.buffer, CSUM_CHUNK);
- len -= i;
- p += i;
- }
+ while (len >= CSUM_CHUNK) {
+ mdfour_update(&md, (uchar *)p, CSUM_CHUNK);
+ len -= CSUM_CHUNK;
+ p += CSUM_CHUNK;
+ }
- while (len >= CSUM_CHUNK) {
- mdfour_update(&md, (uchar *)p, CSUM_CHUNK);
- len -= CSUM_CHUNK;
- p += CSUM_CHUNK;
+ sumresidue = len;
+ if (sumresidue)
+ memcpy(md.buffer, p, sumresidue);
+ break;
+ case CSUM_NONE:
+ break;
+ default: /* paranoia to prevent missing case values */
+ exit_cleanup(RERR_UNSUPPORTED);
}
-
- sumresidue = len;
- if (sumresidue)
- memcpy(md.buffer, p, sumresidue);
}
+/* NOTE: all the callers of sum_end() pass in a pointer to a buffer that is
+ * MAX_DIGEST_LEN in size, so even if the csum-len is shorter that that (i.e.
+ * CSUM_MD4_ARCHAIC), we don't have to worry about limiting the data we write
+ * into the "sum" buffer. */
int sum_end(char *sum)
{
- if (protocol_version >= 30) {
+ switch (cursum_type) {
+ case CSUM_MD5:
md5_result(&md, (uchar *)sum);
- return MD5_DIGEST_LEN;
- }
-
- if (sumresidue || protocol_version >= 27)
+ break;
+ case CSUM_MD4:
+ case CSUM_MD4_OLD:
mdfour_update(&md, (uchar *)md.buffer, sumresidue);
+ mdfour_result(&md, (uchar *)sum);
+ break;
+ case CSUM_MD4_BUSTED:
+ case CSUM_MD4_ARCHAIC:
+ if (sumresidue)
+ mdfour_update(&md, (uchar *)md.buffer, sumresidue);
+ mdfour_result(&md, (uchar *)sum);
+ break;
+ case CSUM_NONE:
+ *sum = '\0';
+ break;
+ default: /* paranoia to prevent missing case values */
+ exit_cleanup(RERR_UNSUPPORTED);
+ }
- mdfour_result(&md, (uchar *)sum);
-
- return MD4_DIGEST_LEN;
+ return csum_len_for_type(cursum_type, 0);
}