/*
* for some weird reason T2queryall() returns share names
* in lower case so we have to do an extra test against
* our share table to validate filename case.
*
* on top of this here (snell & Wilcox) most of our
* redirections point to a share of the same name,
* but some do not, thus the tail of the filename
* returned by T2queryall() is not the same as
* the name we wanted.
*
* We work around this by not validating the names
* or files which resolve to share names as they must
* be correct, having been enforced in the dfs layer.
*/
static int
validfile(char *found, char *want, char *winpath, Share *sp)
{
char *share;
if(strcmp(want, "..") == 0)
return 1;
if(strcmp(winpath, "/") == 0){
share = trimshare(sp->name);
if(cistrcmp(want, share) == 0)
return strcmp(want, share) == 0;
/*
* OK, a DFS redirection points us from a directory XXX
* to a share named YYY. There is no case checking we can
* do so we allow either case - it's all we can do.
*/
return 1;
}
if(cistrcmp(found, want) != 0)
return 0;
if(!Checkcase)
return 1;
if(strcmp(found, want) == 0)
return 1;
return 0;
}
int
mapshare(char *path, Share **osp)
{
int i;
Share *sp;
Dfscache *cp;
char *s, *try;
char *tail[] = { "", "$" };
if((cp = lookup(path, nil)) == nil)
return 0;
for(sp = Shares; sp < Shares+Nshares; sp++){
s = trimshare(sp->name);
if(cistrcmp(cp->share, s) != 0)
continue;
if(Checkcase && strcmp(cp->share, s) != 0)
continue;
if(Debug && strstr(Debug, "dfs") != nil)
print("mapshare, already connected, src=%q => dst=%q\n", path, sp->name);
*osp = sp;
return 0;
}
/*
* Try to autoconnect to share if it is not known. Note even if you
* didn't specify any shares and let the system autoconnect you may
* not already have the share you need as RAP (which we use) throws
* away names > 12 chars long. If we where to use RPC then this block
* of code would be less important, though it would still be useful
* to catch Shares added since cifs(1) was started.
*/
sp = Shares + Nshares;
for(i = 0; i < 2; i++){
try = smprint("%s%s", cp->share, tail[i]);
if(CIFStreeconnect(Sess, Sess->cname, try, sp) == 0){
sp->name = try;
*osp = sp;
Nshares++;
if(Debug && strstr(Debug, "dfs") != nil)
print("mapshare connected, src=%q dst=%q\n",
path, cp->share);
return 0;
}
free(try);
}
if(Debug && strstr(Debug, "dfs") != nil)
print("mapshare failed src=%s\n", path);
werrstr("not found");
return -1;
}
/*
* Rtt_tol is the fractional tollerance for RTT comparisons.
* If a later (further down the list) host's RTT is less than
* 1/Rtt_tol better than my current best then I don't bother
* with it. This biases me towards entries at the top of the list
* which Active Directory has already chosen for me and prevents
* noise in RTTs from pushing me to more distant machines.
*/
static int
remap(Dfscache *cp, Refer *re)
{
int n;
int32_t rtt;
char *p, *a[4];
enum {
Hostname = 1,
Sharename = 2,
Pathname = 3,
Rtt_tol = 10
};
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap %s\n", re->addr);
for(p = re->addr; *p; p++)
if(*p == '\\')
*p = '/';
if(cp->prox < re->prox){
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap %d < %d\n", cp->prox, re->prox);
return -1;
}
if((n = getfields(re->addr, a, sizeof(a), 0, "/")) < 3){
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap nfields=%d\n", n);
return -1;
}
if((rtt = ping(a[Hostname], Dfstout)) == -1){
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap ping failed\n");
return -1;
}
if(cp->rtt < rtt && (rtt/labs(rtt-cp->rtt)) < Rtt_tol){
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap bad ping %ld < %ld && %ld < %d\n",
cp->rtt, rtt, (rtt/labs(rtt-cp->rtt)), Rtt_tol);
return -1;
}
if(n < 4)
a[Pathname] = "";
if(re->ttl == 0)
re->ttl = 60*5;
free(cp->host);
free(cp->share);
free(cp->path);
cp->rtt = rtt;
cp->prox = re->prox;
cp->expiry = time(nil)+re->ttl;
cp->host = estrdup9p(a[Hostname]);
cp->share = estrdup9p(trimshare(a[Sharename]));
cp->path = estrdup9p(a[Pathname]);
if(Debug && strstr(Debug, "dfs") != nil)
print(" remap ping OK prox=%d host=%s share=%s path=%s\n",
cp->prox, cp->host, cp->share, cp->path);
return 0;
}
