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-rw-r--r--source3/msdfs/msdfs.c139
1 files changed, 134 insertions, 5 deletions
diff --git a/source3/msdfs/msdfs.c b/source3/msdfs/msdfs.c
index 2ac7bda175..65622b268c 100644
--- a/source3/msdfs/msdfs.c
+++ b/source3/msdfs/msdfs.c
@@ -158,13 +158,134 @@ static BOOL create_conn_struct( connection_struct *conn, int snum, char *path)
}
+/**********************************************************
+ Under mapfile we expect a table of the following format:
+
+ IP-Prefix whitespace expansion
+
+ For example:
+ 192.168.234 local.samba.org
+ 192.168 remote.samba.org
+ default.samba.org
+
+ This is to redirect a DFS client to a host close to it.
+***********************************************************/
+
+static BOOL read_target_host(const char *mapfile, pstring targethost)
+{
+ XFILE *f;
+ pstring buf;
+ char *s, *space = buf;
+ BOOL found = False;
+
+ f = x_fopen(mapfile, O_RDONLY, 0);
+
+ if (f == NULL) {
+ DEBUG(0,("can't open IP map %s. Error %s\n",
+ mapfile, strerror(errno) ));
+ return False;
+ }
+
+ DEBUG(10, ("Scanning mapfile [%s]\n", mapfile));
+
+ while ((s=fgets_slash(buf, sizeof(buf), f)) != NULL) {
+ space = strchr(buf, ' ');
+
+ if (space == NULL) {
+ DEBUG(0, ("Ignoring invalid line %s\n", buf));
+ continue;
+ }
+
+ *space = '\0';
+
+ if (strncmp(client_addr(), buf, strlen(buf)) == 0) {
+ found = True;
+ break;
+ }
+ }
+
+ x_fclose(f);
+
+ if (!found)
+ return False;
+
+ space += 1;
+
+ while (isspace(*space))
+ space += 1;
+
+ pstrcpy(targethost, space);
+ return True;
+}
+
+/**********************************************************
+
+ Expand the msdfs target host using read_target_host
+ explained above. The syntax used in the msdfs link is
+
+ msdfs:@table-filename@/share
+
+ Everything between and including the two @-signs is
+ replaced by the substitution string found in the table
+ described above.
+
+***********************************************************/
+
+static BOOL expand_msdfs_target(connection_struct* conn, pstring target)
+{
+ pstring mapfilename;
+ char *filename_start = strchr(target, '@');
+ char *filename_end;
+ int filename_len;
+ pstring targethost;
+ pstring new_target;
+
+ if (filename_start == NULL) {
+ DEBUG(10, ("No filename start in %s\n", target));
+ return False;
+ }
+
+ filename_end = strchr(filename_start+1, '@');
+
+ if (filename_end == NULL) {
+ DEBUG(10, ("No filename end in %s\n", target));
+ return False;
+ }
+
+ filename_len = PTR_DIFF(filename_end, filename_start+1);
+ pstrcpy(mapfilename, filename_start+1);
+ mapfilename[filename_len] = '\0';
+
+ DEBUG(10, ("Expanding from table [%s]\n", mapfilename));
+
+ if (!read_target_host(mapfilename, targethost)) {
+ DEBUG(1, ("Could not expand target host from file %s\n",
+ mapfilename));
+ return False;
+ }
+
+ standard_sub_conn(conn, mapfilename, sizeof(mapfilename));
+
+ DEBUG(10, ("Expanded targethost to %s\n", targethost));
+
+ *filename_start = '\0';
+ pstrcpy(new_target, target);
+ pstrcat(new_target, targethost);
+ pstrcat(new_target, filename_end+1);
+
+ DEBUG(10, ("New DFS target: %s\n", new_target));
+ pstrcpy(target, new_target);
+ return True;
+}
+
+
/**********************************************************************
Parse the contents of a symlink to verify if it is an msdfs referral
A valid referral is of the form: msdfs:server1\share1,server2\share2
**********************************************************************/
-static BOOL parse_symlink(char* buf,struct referral** preflist,
- int* refcount)
+static BOOL parse_symlink(connection_struct* conn, char* buf,
+ struct referral** preflist, int* refcount)
{
pstring temp;
char* prot;
@@ -197,14 +318,22 @@ static BOOL parse_symlink(char* buf,struct referral** preflist,
for(i=0;i<count;i++) {
char *p;
+ pstring target;
+
+ pstrcpy(target, alt_path[i]);
+
+ if (strchr(target, '@') != NULL) {
+ if (!expand_msdfs_target(conn, target))
+ return False;
+ }
/* replace all /'s in the alternate path by a \ */
- for(p = alt_path[i]; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
+ for(p = target; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
*p = '\\';
}
/* Remove leading '\\'s */
- p = alt_path[i];
+ p = target;
while (*p && (*p == '\\')) {
p++;
}
@@ -256,7 +385,7 @@ BOOL is_msdfs_link(connection_struct* conn, char * path,
referral[referral_len] = '\0';
DEBUG(5,("is_msdfs_link: %s -> %s\n",path,referral));
- if (parse_symlink(referral, reflistp, refcnt))
+ if (parse_symlink(conn, referral, reflistp, refcnt))
return True;
}
return False;