1 b3994ec5 2003-12-11 devnull #include <u.h>
 2 b3994ec5 2003-12-11 devnull #include <libc.h>
 3 b3994ec5 2003-12-11 devnull #include <ctype.h>
 4 b3994ec5 2003-12-11 devnull 
 5 b3994ec5 2003-12-11 devnull /*
 6 b3994ec5 2003-12-11 devnull  * Absent other hints, it works reasonably well to use
 7 b3994ec5 2003-12-11 devnull  * the X11 display name as the name space identifier.
 8 b3994ec5 2003-12-11 devnull  * This is how sam's B has worked since the early days.
 9 b3994ec5 2003-12-11 devnull  * Since most programs using name spaces are also using X,
10 b3994ec5 2003-12-11 devnull  * this still seems reasonable.  Terminal-only sessions
11 b3994ec5 2003-12-11 devnull  * can set $NAMESPACE.
12 b3994ec5 2003-12-11 devnull  */
13 b3994ec5 2003-12-11 devnull static char*
14 b3994ec5 2003-12-11 devnull nsfromdisplay(void)
15 b3994ec5 2003-12-11 devnull {
16 b3994ec5 2003-12-11 devnull 	int fd;
17 b3994ec5 2003-12-11 devnull 	Dir *d;
18 b3994ec5 2003-12-11 devnull 	char *disp, *p;
19 b3994ec5 2003-12-11 devnull 
20 b3994ec5 2003-12-11 devnull 	if((disp = getenv("DISPLAY")) == nil){
21 b3994ec5 2003-12-11 devnull 		werrstr("$DISPLAY not set");
22 b3994ec5 2003-12-11 devnull 		return nil;
23 b3994ec5 2003-12-11 devnull 	}
24 b3994ec5 2003-12-11 devnull 
25 b3994ec5 2003-12-11 devnull 	/* canonicalize: xxx:0.0 => xxx:0 */
26 b3994ec5 2003-12-11 devnull 	p = strrchr(disp, ':');
27 b3994ec5 2003-12-11 devnull 	if(p){
28 b3994ec5 2003-12-11 devnull 		p++;
29 b3994ec5 2003-12-11 devnull 		while(isdigit((uchar)*p))
30 b3994ec5 2003-12-11 devnull 			p++;
31 b3994ec5 2003-12-11 devnull 		if(strcmp(p, ".0") == 0)
32 b3994ec5 2003-12-11 devnull 			*p = 0;
33 b3994ec5 2003-12-11 devnull 	}
34 b3994ec5 2003-12-11 devnull 
35 b3994ec5 2003-12-11 devnull 	p = smprint("/tmp/ns.%s.%s", getuser(), disp);
36 b3994ec5 2003-12-11 devnull 	free(disp);
37 b3994ec5 2003-12-11 devnull 	if(p == nil){
38 b3994ec5 2003-12-11 devnull 		werrstr("out of memory");
39 b3994ec5 2003-12-11 devnull 		return p;
40 b3994ec5 2003-12-11 devnull 	}
41 b3994ec5 2003-12-11 devnull 	if((fd=create(p, OREAD, DMDIR|0700)) >= 0){
42 b3994ec5 2003-12-11 devnull 		close(fd);
43 b3994ec5 2003-12-11 devnull 		return p;
44 b3994ec5 2003-12-11 devnull 	}
45 b3994ec5 2003-12-11 devnull 	if((d = dirstat(p)) == nil){
46 b3994ec5 2003-12-11 devnull 		free(d);
47 b3994ec5 2003-12-11 devnull 		werrstr("stat %s: %r", p);
48 b3994ec5 2003-12-11 devnull 		free(p);
49 b3994ec5 2003-12-11 devnull 		return nil;
50 b3994ec5 2003-12-11 devnull 	}
51 b3994ec5 2003-12-11 devnull 	if((d->mode&0777) != 0700 || strcmp(d->uid, getuser()) != 0){
52 b3994ec5 2003-12-11 devnull 		werrstr("bad name space dir %s", p);
53 b3994ec5 2003-12-11 devnull 		free(p);
54 b3994ec5 2003-12-11 devnull 		free(d);
55 b3994ec5 2003-12-11 devnull 		return nil;
56 b3994ec5 2003-12-11 devnull 	}
57 b3994ec5 2003-12-11 devnull 	free(d);
58 b3994ec5 2003-12-11 devnull 	return p;
59 b3994ec5 2003-12-11 devnull }
60 b3994ec5 2003-12-11 devnull 
61 b3994ec5 2003-12-11 devnull char*
62 b3994ec5 2003-12-11 devnull getns(void)
63 b3994ec5 2003-12-11 devnull {
64 b3994ec5 2003-12-11 devnull 	char *ns;
65 b3994ec5 2003-12-11 devnull 
66 b3994ec5 2003-12-11 devnull 	ns = getenv("NAMESPACE");
67 b3994ec5 2003-12-11 devnull 	if(ns == nil)
68 b3994ec5 2003-12-11 devnull 		ns = nsfromdisplay();
69 b3994ec5 2003-12-11 devnull 	if(ns == nil){
70 b3994ec5 2003-12-11 devnull 		werrstr("$NAMESPACE not set, %r");
71 b3994ec5 2003-12-11 devnull 		return nil;
72 b3994ec5 2003-12-11 devnull 	}
73 b3994ec5 2003-12-11 devnull 	return ns;
74 b3994ec5 2003-12-11 devnull }