#include "rsync.h"
+extern int am_server;
+extern int local_server;
+extern int whole_file;
+extern int read_batch;
extern int checksum_seed;
extern int protocol_version;
extern int proper_seed_order;
#define CSUM_MD4 4
#define CSUM_MD5 5
+#define CSUM_SAW_BUFLEN 10
+
+struct csum_struct {
+ int num;
+ const char *name;
+} valid_checksums[] = {
+ { CSUM_MD5, "md5" },
+ { CSUM_MD4, "md4" },
+ { CSUM_NONE, "none" },
+ { -1, NULL }
+};
+
+#define MAX_CHECKSUM_LIST 1024
+
int xfersum_type = 0; /* used for the file transfer checksums */
int checksum_type = 0; /* used for the pre-transfer (--checksum) checksums */
+const char *negotiated_csum_name = NULL;
-/* Returns 1 if --whole-file must be enabled. */
-int parse_checksum_choice(void)
+static int parse_csum_name(const char *name, int len, int allow_auto)
{
- 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;
-}
+ struct csum_struct *cs;
-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 (!name || (allow_auto && len == 4 && strncasecmp(name, "auto", 4) == 0)) {
if (protocol_version >= 30)
return CSUM_MD5;
if (protocol_version >= 27)
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);
+
+ for (cs = valid_checksums; cs->name; cs++) {
+ if (strncasecmp(name, cs->name, len) == 0 && cs->name[len] == '\0')
+ return cs->num;
+ }
+
+ if (allow_auto) {
+ rprintf(FERROR, "unknown checksum name: %s\n", name);
+ exit_cleanup(RERR_UNSUPPORTED);
+ }
+
+ return -1;
+}
+
+static const char *checksum_name(int num)
+{
+ struct csum_struct *cs;
+
+ for (cs = valid_checksums; cs->name; cs++) {
+ if (num == cs->num)
+ return cs->name;
+ }
+
+ if (num < CSUM_MD4)
+ return "MD4";
+
+ return "UNKNOWN";
+}
+
+void parse_checksum_choice(int final_call)
+{
+ if (!negotiated_csum_name) {
+ char *cp = checksum_choice ? strchr(checksum_choice, ',') : NULL;
+ if (cp) {
+ xfersum_type = parse_csum_name(checksum_choice, cp - checksum_choice, 1);
+ checksum_type = parse_csum_name(cp+1, -1, 1);
+ } else
+ xfersum_type = checksum_type = parse_csum_name(checksum_choice, -1, 1);
+ }
+
+ if (xfersum_type == CSUM_NONE)
+ whole_file = 1;
+
+ if (final_call && DEBUG_GTE(CSUM, 1)) {
+ if (negotiated_csum_name)
+ rprintf(FINFO, "[%s] negotiated checksum: %s\n", who_am_i(), negotiated_csum_name);
+ else if (xfersum_type == checksum_type) {
+ rprintf(FINFO, "[%s] %s checksum: %s\n", who_am_i(),
+ checksum_choice ? "chosen" : "protocol-based",
+ checksum_name(xfersum_type));
+ } else {
+ rprintf(FINFO, "[%s] chosen transfer checksum: %s\n",
+ who_am_i(), checksum_name(xfersum_type));
+ rprintf(FINFO, "[%s] chosen pre-transfer checksum: %s\n",
+ who_am_i(), checksum_name(checksum_type));
+ }
+ }
+}
+
+static int parse_checksum_list(const char *from, char *sumbuf, int sumbuf_len, char *saw)
+{
+ char *to = sumbuf, *tok = NULL;
+ int cnt = 0;
+
+ memset(saw, 0, CSUM_SAW_BUFLEN);
+
+ while (1) {
+ if (*from == ' ' || !*from) {
+ if (tok) {
+ int sum_type = parse_csum_name(tok, to - tok, 0);
+ if (sum_type >= 0 && !saw[sum_type])
+ saw[sum_type] = ++cnt;
+ else
+ to = tok - (tok != sumbuf);
+ tok = NULL;
+ }
+ if (!*from++)
+ break;
+ continue;
+ }
+ if (!tok) {
+ if (to != sumbuf)
+ *to++ = ' ';
+ tok = to;
+ }
+ if (to - sumbuf >= sumbuf_len - 1) {
+ to = tok - (tok != sumbuf);
+ break;
+ }
+ *to++ = *from++;
+ }
+ *to = '\0';
+
+ return to - sumbuf;
+}
+
+void negotiate_checksum(int f_in, int f_out, const char *csum_list, int saw_fail)
+{
+ char *tok, sumbuf[MAX_CHECKSUM_LIST], saw[CSUM_SAW_BUFLEN];
+ int sum_type, len;
+
+ /* Simplify the user-provided string so that it contains valid
+ * checksum names without any duplicates. The client side also
+ * makes use of the saw values when scanning the server's list. */
+ if (csum_list && *csum_list && (!am_server || local_server)) {
+ len = parse_checksum_list(csum_list, sumbuf, sizeof sumbuf, saw);
+ if (saw_fail && !len)
+ len = strlcpy(sumbuf, "FAIL", sizeof sumbuf);
+ csum_list = sumbuf;
+ } else
+ csum_list = NULL;
+
+ if (!csum_list || !*csum_list) {
+ struct csum_struct *cs;
+ for (tok = sumbuf, cs = valid_checksums, len = 0; cs->name; cs++) {
+ if (cs->num == CSUM_NONE)
+ continue;
+ if (tok != sumbuf)
+ *tok++ = ' ';
+ tok += strlcpy(tok, cs->name, sizeof sumbuf - (tok - sumbuf));
+ saw[cs->num] = ++len;
+ }
+ *tok = '\0';
+ len = tok - sumbuf;
+ }
+
+ /* Each side sends their list of valid checksum names to the other side and
+ * then both sides pick the first name in the client's list that is also in
+ * the server's list. */
+ if (!local_server)
+ write_vstring(f_out, sumbuf, len);
+
+ if (!local_server || read_batch)
+ len = read_vstring(f_in, sumbuf, sizeof sumbuf);
+
+ if (len > 0) {
+ int best = CSUM_SAW_BUFLEN; /* We want best == 1 from the client list */
+ if (am_server)
+ memset(saw, 1, CSUM_SAW_BUFLEN); /* The first client's choice is the best choice */
+ for (tok = strtok(sumbuf, " \t"); tok; tok = strtok(NULL, " \t")) {
+ sum_type = parse_csum_name(tok, -1, 0);
+ if (sum_type < 0 || !saw[sum_type] || best < saw[sum_type])
+ continue;
+ xfersum_type = checksum_type = sum_type;
+ negotiated_csum_name = tok;
+ best = saw[sum_type];
+ if (best == 1)
+ break;
+ }
+ if (negotiated_csum_name) {
+ negotiated_csum_name = strdup(negotiated_csum_name);
+ return;
+ }
+ }
+
+ if (!am_server)
+ msleep(20);
+ rprintf(FERROR, "Failed to negotiate a common checksum\n");
exit_cleanup(RERR_UNSUPPORTED);
}
return csum_type >= CSUM_MD4 ? 1 : 0;
}
+#ifndef HAVE_SIMD /* See simd-checksum-*.cpp. */
/*
a simple 32 bit checksum that can be updated from either end
(inspired by Mark Adler's Adler-32 checksum)
}
return (s1 & 0xffff) + (s2 << 16);
}
+#endif
void get_checksum2(char *buf, int32 len, char *sum)
{
char s[4];
if (csum_type < 0)
- csum_type = parse_csum_name(NULL, 0);
+ csum_type = parse_csum_name(NULL, 0, 1);
cursum_type = csum_type;
switch (csum_type) {
git.samba.org / rsync.git / blobdiff