1/************************************************************************
2 *	setid		executes commands under a different		*
3 *			uid/gid (can only be executed by root)		*
4 *	This program is used by the SmartList installation script only. *
5 ************************************************************************/
6/*$Id: setid.c,v 1.12 2000/09/28 01:23:39 guenther Exp $*/
7#include "includes.h"
8
9#define CHECK_FILE	"install.sh"
10
11int main(argc,argv)const int argc;const char*const argv[];
12{ struct passwd*p;char*nargv[2];
13  if(argc!=2&&argc!=3||geteuid()||!(p=getpwnam(argv[1])))
14   { fprintf(stderr,"Usage: setid user [directory]\n");
15     return EX_USAGE;
16   }
17  endpwent();
18  if(initgroups(argv[1],p->pw_gid)||setgid(p->pw_gid)||setuid(p->pw_uid))
19     return EX_OSERR;
20  if(fopen(CHECK_FILE,"r"))
21   { struct stat stbuf;
22     if(argc==2)
23	goto nodir;
24     if(stat(argv[2],&stbuf)||(stbuf.st_mode&S_IRWXU)!=S_IRWXU)
25	fprintf(stderr,"Can't access %s, are you sure it's there?\n",argv[2]);
26     else if(stbuf.st_uid!=p->pw_uid)
27	fprintf(stderr,"%s is owned by uid %ld!=%s, please fix this first\n",
28	 argv[2],(long)stbuf.st_uid,p->pw_name);
29     else if(stbuf.st_gid!=p->pw_gid)
30	fprintf(stderr,"%s is owned by gid %ld!=%ld, please fix this first\n",
31	 argv[2],(long)stbuf.st_gid,(long)p->pw_gid);
32     else
33nodir:	nargv[0]=getenv("SHELL"),nargv[1]=0,execv(nargv[0],nargv);
34   }
35  else
36     fprintf(stderr,
37      "Please make sure %s can read & access the source tree\n",argv[1]);
38  return EX_UNAVAILABLE;
39}
40