98 lines
1.7 KiB
C
98 lines
1.7 KiB
C
#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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static int
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isme(char *uid)
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{
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int n;
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char *p;
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n = strtol(uid, &p, 10);
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if(*p == 0 && p > uid)
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return n == getuid();
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return strcmp(getuser(), uid) == 0;
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}
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/*
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* Absent other hints, it works reasonably well to use
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* the X11 display name as the name space identifier.
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* This is how sam's B has worked since the early days.
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* Since most programs using name spaces are also using X,
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* this still seems reasonable. Terminal-only sessions
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* can set $NAMESPACE.
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*/
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static char*
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nsfromdisplay(void)
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{
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int fd;
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Dir *d;
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char *disp, *p;
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if((disp = getenv("DISPLAY")) == nil){
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#ifdef __APPLE__
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// Might be running native GUI on OS X.
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disp = strdup(":0.0");
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if(disp == nil)
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return nil;
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#else
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werrstr("$DISPLAY not set");
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return nil;
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#endif
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}
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/* canonicalize: xxx:0.0 => xxx:0 */
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p = strrchr(disp, ':');
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if(p){
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p++;
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while(isdigit((uchar)*p))
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p++;
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if(strcmp(p, ".0") == 0)
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*p = 0;
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}
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/* turn /tmp/launch/:0 into _tmp_launch_:0 (OS X 10.5) */
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for(p=disp; *p; p++)
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if(*p == '/')
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*p = '_';
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p = smprint("/tmp/ns.%s.%s", getuser(), disp);
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free(disp);
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if(p == nil){
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werrstr("out of memory");
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return p;
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}
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if((fd=create(p, OREAD, DMDIR|0700)) >= 0){
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close(fd);
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return p;
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}
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if((d = dirstat(p)) == nil){
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free(d);
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werrstr("stat %s: %r", p);
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free(p);
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return nil;
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}
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if((d->mode&0777) != 0700 || !isme(d->uid)){
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werrstr("bad name space dir %s", p);
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free(p);
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free(d);
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return nil;
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}
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free(d);
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return p;
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}
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char*
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getns(void)
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{
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char *ns;
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ns = getenv("NAMESPACE");
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if(ns == nil)
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ns = nsfromdisplay();
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if(ns == nil){
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werrstr("$NAMESPACE not set, %r");
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return nil;
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}
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return ns;
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}
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