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/* This is part of um-ViewOS
* The user-mode implementation of OSVIEW -- A Process with a View
*
* viewsudo user command
*
* Copyright 2010 Renzo Davoli University of Bologna - Italy
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2 or
* (at your option) any later version, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* $Id: um_add_service.c 775 2009-09-01 21:15:23Z rd235 $
*
*/
#include <config.h>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <libgen.h>
#include <um_lib.h>
static struct option long_options[] = {
{"help", 1, 0, 'h'},
{0, 0, 0, 0}
};
char *command;
char *user;
char *group;
int uid;
int gid;
int ngroups;
gid_t *groups;
void usage(char *argv0)
{
char *name=basename(argv0);
fprintf(stderr,
"Usage: %s [options] [LOGIN]\n"
"\n"
"Options:\n"
" -u username|#uid\n"
" -g groupname|#gid\n"
"\n",
name
);
exit(2);
}
int main(int argc, char *argv[])
{
pid_t pid;
int status;
int c;
struct passwd *pwd;
/* outside viewos use sudo(1) */
if (um_check_viewos()==0)
execvp("sudo",argv);
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "u:g:h",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'u':user=optarg;
break;
case 'g':group=optarg;
break;
case 'h': usage(argv[0]);
break;
}
}
if (argc==optind)
usage(argv[0]);
if (user) {
if (*user == '#')
uid=atoi(user+1);
else {
pwd=getpwnam(user);
if (pwd == NULL) {
fprintf(stderr,"Unknown id: %s\n",user);
exit(1);
}
uid=pwd->pw_uid;
}
} else {
if (group)
uid=getuid();
}
if (pwd==NULL)
pwd=getpwuid(uid);
if (pwd) {
gid=pwd->pw_gid;
setenv("HOME",pwd->pw_dir,1);
}
if (group) {
if (*group == '#')
gid=atoi(group+1);
else {
struct group *grp=getgrnam(group);
if (grp == NULL) {
fprintf(stderr,"Unknown group id: %s\n",group);
exit(1);
}
gid=grp->gr_gid;
}
}
if (pwd) {
getgrouplist(pwd->pw_name,gid,NULL,&ngroups);
groups=malloc(ngroups * sizeof (gid_t));
if (groups == NULL)
ngroups=0;
else
getgrouplist(pwd->pw_name,gid,groups,&ngroups);
}
switch (pid=fork()) {
case -1: exit(1);
case 0:
if (setresuid(uid,uid,uid) < 0)
perror(argv[0]);
else {
setresgid(gid,gid,gid);
setgroups(ngroups,groups);
execvp(argv[optind],argv+optind);
perror(argv[optind]);
}
exit(1);
break;
default:
waitpid(pid,&status,0);
return(WEXITSTATUS(status));
}
return 0;
}
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