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/* pututmpid.c
usage: pututmpid [-w] c2 child arg...
usage: pututmpid reboot
usage: pututmpid halt
c2 is the same entry as in /etc/inittab
c2:2345:respawn:/sbin/fgetty tty2
see the end of this file how it works
*/
#include <unistd.h>
#include <fcntl.h>
#include <utmp.h>
#include <time.h>
#include <sys/utsname.h>
#include "ninitfeatures.h"
#include "utmp_defs.h"
int main(int argc, char **argv) {
struct utmp u;
char *utid,*argv0,*x;
char flagwtmp=0;
int fd;
off_t pos=0;
if (argv[1] && argv[1][0] == '-' && argv[1][1] == 'w')
{++argv; --argc; flagwtmp=1;}
if (argc >=3) {
char **e, *env[2] = {0,0};
size_t len = str_len(argv[1]);
utid = argv[1];
if (len>4) utid += len-4;
argv += 2;
fd=open(_PATH_UTMP, O_RDWR);
while (utmp_io(fd, &u, F_RDLCK)) {
if (!str_diffn(u.ut_id, utid, sizeof(u.ut_id))) {
if (u.ut_type == USER_PROCESS) {
u.ut_tv.tv_sec=time(0);
u.ut_type=DEAD_PROCESS;
/* byte_zero(&u.ut_user, sizeof(u.ut_user));
byte_zero(&u.ut_host, sizeof(u.ut_host)); */
do_wtmp(&u);
}
break ;
}
pos += sizeof(struct utmp);
}
byte_zero(&u,sizeof(u));
str_copyn(u.ut_id, utid, sizeof(u.ut_id));
u.ut_pid=getpid();
u.ut_tv.tv_sec=time(0);
u.ut_type=INIT_PROCESS;
if (fd>=0 && lseek(fd,pos,SEEK_SET) == pos)
utmp_io(fd,&u,F_WRLCK);
close(fd);
if (flagwtmp) do_wtmp(&u);
argv0 = argv[0];
x = argv[0];
x += str_rchr(x,'/');
if (x[0]) argv[0] = x+1;
else argv[0] = argv0;
for (e=environ; *e; e++)
if (!str_diffn(*e,"TERM=",5)) {*env=*e; break;}
execve(argv0, argv, env);
write(2,"unable to exec: ",16);
write(2,argv0,str_len(argv0));
write(2,"\n",1);
return(100);
}
/******************************************************/
if (argc == 2) {
struct utsname uname_buf;
fd = -1;
switch (argv[1][0]) {
case 'r':
fd=open(_PATH_UTMP, O_RDWR);
while (utmp_io(fd, &u, F_RDLCK)) {
/* if already exist do nothing */
if (u.ut_type == BOOT_TIME) { close(fd); return 111; }
pos += sizeof(struct utmp);
}
byte_zero(&u,sizeof(u));
str_copy(u.ut_user,"reboot");
str_copy(u.ut_line,"~");
u.ut_type=BOOT_TIME;
break;
case 's':
case 'h':
str_copy(u.ut_user,"shutdown");
u.ut_type=RUN_LVL;
str_copy(u.ut_line,"~~");
break;
default:
goto usage;
}
str_copy(u.ut_id,"~~");
u.ut_pid=0;
u.ut_tv.tv_sec=time(0);
/* Put the OS version in place of the hostname */
if (uname(&uname_buf) == 0)
str_copyn(u.ut_host, uname_buf.release, 32); /* XXX overflow ? */
if (fd>=0 && lseek(fd,pos,SEEK_SET) == pos)
utmp_io(fd,&u,F_WRLCK);
close(fd);
do_wtmp(&u);
return(0);
}
usage:
write(2,"usage: pututmpid [-w] ut_id child arg...\n\
pututmpid reboot\n\
pututmpid halt\n",87);
return(100);
}
/*
pututmpid:
if exist an entry in utmp with: ut_id=c2 ut_type=USER_PROCESS
then put: ut_id=c2 ut_type=DEAD_PROCESS in wtmp
always put: ut_id=c2 ut_type=INIT_PROCESS in utmp
if -w flag put: ut_id=c2 ut_type=INIT_PROCESS in wtmp
getty and login chanegs /var/run/utmp:
getty: ut_id=c2 ut_type=LOGIN_PROCESS
login: ut_id=c2 ut_type=USER_PROCESS
*/
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