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#include <unistd.h>
#include <utmp.h>
#include <time.h>
#include <alloca.h>
#include <fcntl.h>
#include <sys/utsname.h>
#include "ninitfeatures.h"
#include "utmp_defs.h"
static unsigned long env_free, env_allocated;
#include "contrib/put_env.h"
static void init_utmp(struct utmp *u) {
byte_zero(u, sizeof(struct utmp));
str_copy(u->ut_line,"~");
str_copy(u->ut_id,"~~");
u->ut_tv.tv_sec=time(0);
}
int main(int argc, char **argv) {
pid_t prev=0;
int i,fd;
char **env, ch, prevlevel[20], ninit_runlevel[20];
char boot_time=0;
struct utmp u;
struct utsname uname_buf;
off_t pos=0, runlevel_pos=0;
str_copy(prevlevel, "PREVLEVEL=N");
str_copy(ninit_runlevel, "NINIT_RUNLEVEL=N");
fd=open(_PATH_UTMP, (argc>1) ? O_RDWR : O_RDONLY);
while (utmp_io(fd, &u, F_RDLCK)) {
if (u.ut_type == BOOT_TIME) boot_time = 1;
if (u.ut_type == RUN_LVL) {
prev = u.ut_pid;
runlevel_pos = pos;
if (argc < 2) {
char m[] = "N N\n";
i = prev / 256; if (i) m[0] = i;
i = prev % 256; if (i) m[2] = i;
write(1, m, 4);
return 0;
}
}
pos += sizeof(struct utmp);
}
if (argc < 2) _exit(1);
prev %= 256;
ch = argv[1][0];
if (boot_time == 0) {
init_utmp(&u);
u.ut_type=BOOT_TIME;
str_copy(u.ut_user,"reboot");
if (lseek(fd,pos,SEEK_SET) == pos)
utmp_io(fd,&u,F_WRLCK);
}
pos = runlevel_pos;
if (pos == 0 && lseek(fd,0,SEEK_SET) == 0) {
while (utmp_io(fd, &u, F_RDLCK)) {
if (u.ut_type == RUN_LVL) break;
pos += sizeof(struct utmp);
}
}
init_utmp(&u);
u.ut_type=RUN_LVL;
str_copy(u.ut_user,"runlevel");
if (prev==0) prev='N';
u.ut_pid = (256*prev) + ch;
if (lseek(fd,pos,SEEK_SET) == pos)
utmp_io(fd,&u,F_WRLCK);
close(fd);
if (uname(&uname_buf) == 0)
str_copyn(u.ut_host, uname_buf.release, 32); /* XXX overflow ? */
do_wtmp(&u);
/* ------ exnivon + exeve ----- */
if (environ==0) environ = argv+argc;
for (env=environ; *env; ++env) env_allocated++;
env_free = argc + 12;
env=alloca((env_allocated + env_free + 1) * sizeof(char*));
if (env==0) return -1;
byte_copy(env, (env_allocated+1)*sizeof(char *), environ);
environ = env;
prevlevel[10] = prev;
ninit_runlevel[15] = ch;
put_env(prevlevel);
put_env(ninit_runlevel);
put_env(ninit_runlevel+6);
put_env("INIT_VERSION=" SYSVINIT_VERSION);
put_env("CONSOLE=/dev/console");
put_env("PATH=/bin:/usr/bin:/sbin:/usr/sbin");
for (i=2; i<argc; ++i) {
char *v=argv[i];
char *nenv=0;
if (v[0]=='-') {
if (v[1]==0) {
environ[0]=0;
} else {
switch (*++v) {
case 'i': environ[0]=0; goto do_it;
case 'u':
if (v[1]) { nenv = v+1; goto do_it; }
else if (argv[++i]) { nenv = argv[i]; goto do_it; }
default:
goto ready;
}
}
} else {
if (v[str_chr(v,'=')] == 0) goto ready;
nenv = v;
}
do_it:
if (nenv) put_env(nenv);
continue;
}
ready:
argv += i;
if (argv[0]) {
execve(argv[0], argv, environ);
return 100;
}
return 0;
}
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