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 ca786c9f 2006-06-12 devnull static int
 6 ca786c9f 2006-06-12 devnull isme(char *uid)
 7 ca786c9f 2006-06-12 devnull {
 8 ca786c9f 2006-06-12 devnull 	int n;
 9 ca786c9f 2006-06-12 devnull 	char *p;
10 ca786c9f 2006-06-12 devnull 
11 ca786c9f 2006-06-12 devnull 	n = strtol(uid, &p, 10);
12 ca786c9f 2006-06-12 devnull 	if(*p == 0 && p > uid)
13 ca786c9f 2006-06-12 devnull 		return n == getuid();
14 ca786c9f 2006-06-12 devnull 	return strcmp(getuser(), uid) == 0;
15 ca786c9f 2006-06-12 devnull }
16 b3994ec5 2003-12-11 devnull /*
17 b3994ec5 2003-12-11 devnull  * Absent other hints, it works reasonably well to use
18 b3994ec5 2003-12-11 devnull  * the X11 display name as the name space identifier.
19 b3994ec5 2003-12-11 devnull  * This is how sam's B has worked since the early days.
20 b3994ec5 2003-12-11 devnull  * Since most programs using name spaces are also using X,
21 b3994ec5 2003-12-11 devnull  * this still seems reasonable.  Terminal-only sessions
22 b3994ec5 2003-12-11 devnull  * can set $NAMESPACE.
23 b3994ec5 2003-12-11 devnull  */
24 b3994ec5 2003-12-11 devnull static char*
25 b3994ec5 2003-12-11 devnull nsfromdisplay(void)
26 b3994ec5 2003-12-11 devnull {
27 b3994ec5 2003-12-11 devnull 	int fd;
28 b3994ec5 2003-12-11 devnull 	Dir *d;
29 b3994ec5 2003-12-11 devnull 	char *disp, *p;
30 b3994ec5 2003-12-11 devnull 
31 b3994ec5 2003-12-11 devnull 	if((disp = getenv("DISPLAY")) == nil){
32 b3994ec5 2003-12-11 devnull 		werrstr("$DISPLAY not set");
33 b3994ec5 2003-12-11 devnull 		return nil;
34 b3994ec5 2003-12-11 devnull 	}
35 b3994ec5 2003-12-11 devnull 
36 b3994ec5 2003-12-11 devnull 	/* canonicalize: xxx:0.0 => xxx:0 */
37 b3994ec5 2003-12-11 devnull 	p = strrchr(disp, ':');
38 b3994ec5 2003-12-11 devnull 	if(p){
39 b3994ec5 2003-12-11 devnull 		p++;
40 b3994ec5 2003-12-11 devnull 		while(isdigit((uchar)*p))
41 b3994ec5 2003-12-11 devnull 			p++;
42 b3994ec5 2003-12-11 devnull 		if(strcmp(p, ".0") == 0)
43 b3994ec5 2003-12-11 devnull 			*p = 0;
44 b3994ec5 2003-12-11 devnull 	}
45 b3994ec5 2003-12-11 devnull 
46 b3994ec5 2003-12-11 devnull 	p = smprint("/tmp/ns.%s.%s", getuser(), disp);
47 b3994ec5 2003-12-11 devnull 	free(disp);
48 b3994ec5 2003-12-11 devnull 	if(p == nil){
49 b3994ec5 2003-12-11 devnull 		werrstr("out of memory");
50 b3994ec5 2003-12-11 devnull 		return p;
51 b3994ec5 2003-12-11 devnull 	}
52 b3994ec5 2003-12-11 devnull 	if((fd=create(p, OREAD, DMDIR|0700)) >= 0){
53 b3994ec5 2003-12-11 devnull 		close(fd);
54 b3994ec5 2003-12-11 devnull 		return p;
55 b3994ec5 2003-12-11 devnull 	}
56 b3994ec5 2003-12-11 devnull 	if((d = dirstat(p)) == nil){
57 b3994ec5 2003-12-11 devnull 		free(d);
58 b3994ec5 2003-12-11 devnull 		werrstr("stat %s: %r", p);
59 b3994ec5 2003-12-11 devnull 		free(p);
60 b3994ec5 2003-12-11 devnull 		return nil;
61 b3994ec5 2003-12-11 devnull 	}
62 ca786c9f 2006-06-12 devnull 	if((d->mode&0777) != 0700 || !isme(d->uid)){
63 b3994ec5 2003-12-11 devnull 		werrstr("bad name space dir %s", p);
64 b3994ec5 2003-12-11 devnull 		free(p);
65 b3994ec5 2003-12-11 devnull 		free(d);
66 b3994ec5 2003-12-11 devnull 		return nil;
67 b3994ec5 2003-12-11 devnull 	}
68 b3994ec5 2003-12-11 devnull 	free(d);
69 b3994ec5 2003-12-11 devnull 	return p;
70 b3994ec5 2003-12-11 devnull }
71 b3994ec5 2003-12-11 devnull 
72 b3994ec5 2003-12-11 devnull char*
73 b3994ec5 2003-12-11 devnull getns(void)
74 b3994ec5 2003-12-11 devnull {
75 b3994ec5 2003-12-11 devnull 	char *ns;
76 b3994ec5 2003-12-11 devnull 
77 b3994ec5 2003-12-11 devnull 	ns = getenv("NAMESPACE");
78 b3994ec5 2003-12-11 devnull 	if(ns == nil)
79 b3994ec5 2003-12-11 devnull 		ns = nsfromdisplay();
80 b3994ec5 2003-12-11 devnull 	if(ns == nil){
81 b3994ec5 2003-12-11 devnull 		werrstr("$NAMESPACE not set, %r");
82 b3994ec5 2003-12-11 devnull 		return nil;
83 b3994ec5 2003-12-11 devnull 	}
84 b3994ec5 2003-12-11 devnull 	return ns;
85 b3994ec5 2003-12-11 devnull }