#define VT_LOG "/dev/tty3" /* Virtual console */
#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
-#define SHELL "-sh" /* Default shell */
+#define SHELL "/bin/sh" /* Default shell */
#define INITTAB "/etc/inittab" /* inittab file location */
+#ifndef INIT_SCRIPT
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
+#endif
#define LOG 0x1
#define CONSOLE 0x2
struct initActionTag {
pid_t pid;
char process[256];
- char *console;
+ char console[256];
initAction *nextPtr;
initActionEnum action;
};
initAction* initActionList = NULL;
-static char *console = _PATH_CONSOLE;
-static char *second_console = VT_SECONDARY;
+static char *secondConsole = VT_SECONDARY;
static char *log = VT_LOG;
-static int kernel_version = 0;
+static int kernelVersion = 0;
+static char termType[32] = "TERM=ansi";
+static char console[32] = _PATH_CONSOLE;
/* try to open up the specified device */
va_start(arguments, fmt);
vsnprintf(msg, sizeof(msg), fmt, arguments);
va_end(arguments);
+ openlog( "init", 0, LOG_DAEMON);
syslog(LOG_DAEMON|LOG_NOTICE, msg);
+ closelog();
}
#else
struct serial_struct sr;
char *s;
+ if ((s = getenv("TERM")) != NULL) {
+ snprintf(termType,sizeof(termType)-1,"TERM=%s",s);
+ }
+
if ((s = getenv("CONSOLE")) != NULL) {
- console = s;
+ snprintf(console, sizeof(console)-1, "%s",s);
}
#if #cpu(sparc)
/* sparc kernel supports console=tty[ab] parameter which is also
else if ((s = getenv("console")) != NULL) {
/* remap tty[ab] to /dev/ttyS[01] */
if (strcmp( s, "ttya" )==0)
- console = SERIAL_CON0;
+ snprintf(console, sizeof(console)-1, "%s", SERIAL_CON0);
else if (strcmp( s, "ttyb" )==0)
- console = SERIAL_CON1;
+ snprintf(console, sizeof(console)-1, "%s", SERIAL_CON1);
}
#endif
else {
struct vt_stat vt;
- static char the_console[13];
- console = the_console;
/* 2.2 kernels: identify the real console backend and try to use it */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is a serial console */
- snprintf( the_console, sizeof the_console, "/dev/ttyS%d", sr.line );
+ snprintf(console, sizeof(console)-1, "/dev/ttyS%d", sr.line);
}
else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
/* this is linux virtual tty */
- snprintf( the_console, sizeof the_console, "/dev/tty%d", vt.v_active );
+ snprintf(console, sizeof(console)-1, "/dev/tty%d", vt.v_active);
} else {
- console = _PATH_CONSOLE;
+ snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
tried_devcons++;
}
}
/* Can't open selected console -- try /dev/console */
if (!tried_devcons) {
tried_devcons++;
- console = _PATH_CONSOLE;
+ snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
continue;
}
/* Can't open selected console -- try vt1 */
if (!tried_vtprimary) {
tried_vtprimary++;
- console = VT_PRIMARY;
+ snprintf(console, sizeof(console)-1, "%s", VT_PRIMARY);
continue;
}
break;
}
- if (fd < 0)
+ if (fd < 0) {
/* Perhaps we should panic here? */
- console = "/dev/null";
- else {
+ snprintf(console, sizeof(console)-1, "/dev/null");
+ } else {
/* check for serial console and disable logging to tty3 & running a
* shell to tty2 */
if (ioctl(0,TIOCGSERIAL,&sr) == 0) {
- message(LOG|CONSOLE, "serial console detected. Disabling 2nd virtual terminal.\r\n", console );
+ message(LOG|CONSOLE, "serial console detected. Disabling virtual terminals.\r\n" );
log = NULL;
- second_console = NULL;
+ secondConsole = NULL;
}
close(fd);
}
message(LOG, "console=%s\n", console );
}
-static int waitfor(int pid)
-{
- int status, wpid;
-
- while (1) {
- wpid = wait(&status);
- if (wpid > 0 ) {
- message(LOG, "pid %d exited, status=0x%x.\n", wpid, status);
- break;
- }
- if (wpid == pid )
- break;
- }
- return wpid;
-}
-
static pid_t run(char* command,
char *terminal, int get_enter)
{
- int i;
+ int i, fd;
pid_t pid;
char* tmpCmd;
char* cmd[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
+ char* environment[] = {
+ "HOME=/",
+ "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
+ "SHELL=/bin/sh",
+ termType,
+ "USER=root",
+ 0
+ };
+
if ((pid = fork()) == 0) {
pid_t shell_pgid = getpid ();
close(2);
setsid();
- if (device_open(terminal, O_RDWR) < 0) {
- message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
- exit(1);
- }
- dup(0);
- dup(0);
- /* Grab control of the terminal. */
- if (tcsetpgrp (0, getpgrp()) < 0) {
- message(LOG|CONSOLE, "tcsetpgrp error: %s\r\n", strerror(errno));
- }
- set_term(0);
-
/* Reset signal handlers set for parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
+ if ((fd = device_open(terminal, O_RDWR)) < 0) {
+ message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
+ exit(1);
+ }
+ dup(fd);
+ dup(fd);
+ tcsetpgrp (0, getpgrp());
+ set_term(0);
if (get_enter==TRUE) {
/*
read(fileno(stdin), &c, 1);
}
+ /* Log the process name and args */
+ message(LOG, "Starting pid %d, console %s: '",
+ shell_pgid, terminal, command);
+
/* Convert command (char*) into cmd (char**, one word per string) */
for (tmpCmd=command, i=0; (tmpCmd=strsep(&command, " \t")) != NULL;) {
if (*tmpCmd != '\0') {
cmd[i] = tmpCmd;
+ message(LOG, "%s ", tmpCmd);
tmpCmd++;
i++;
}
}
cmd[i] = NULL;
-
- /* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '%s'\r\n",
- shell_pgid, terminal, cmd[0]);
+ message(LOG, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
- execvp(cmd[0], cmd);
+ execve(cmd[0], cmd, environment);
/* We're still here? Some error happened. */
message(LOG|CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
return pid;
}
+static int waitfor(char* command,
+ char *terminal, int get_enter)
+{
+ int status, wpid;
+ int pid = run( command, terminal, get_enter);
+
+ while (1) {
+ wpid = wait(&status);
+ if (wpid > 0 ) {
+ message(LOG, "Process '%s' (pid %d) exited.\n",
+ command, wpid);
+ break;
+ }
+ if (wpid == pid )
+ break;
+ }
+ return wpid;
+}
+
/* Make sure there is enough memory to do something useful. *
* Calls swapon if needed so be sure /proc is mounted. */
static void check_memory()
{
- struct stat statbuf;
+ struct stat statBuf;
if (mem_total() > 3500)
return;
- if (stat("/etc/fstab", &statbuf) == 0) {
+ if (stat("/etc/fstab", &statBuf) == 0) {
/* Try to turn on swap */
- waitfor(run("/bin/swapon swapon -a", log, FALSE));
+ waitfor("/bin/swapon swapon -a", log, FALSE);
if (mem_total() < 3500)
goto goodnight;
} else
sleep(1);
message(CONSOLE, "Disabling swap.\r\n");
- waitfor(run( "swapoff -a", console, FALSE));
+ waitfor( "swapoff -a", console, FALSE);
message(CONSOLE, "Unmounting filesystems.\r\n");
- waitfor(run( "umount -a", console, FALSE));
+ waitfor("umount -a", console, FALSE);
sync();
- if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) {
+ if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
- message(CONSOLE, "Flushing buffers.\r\n");
bdflush(1, 0);
sync();
}
exit(0);
}
-#endif
+#if defined BB_FEATURE_INIT_CHROOT
+static void check_chroot(int sig)
+{
+ char *argv_init[2] = { "init", NULL, };
+ char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
+ char rootpath[256], *tc;
+ int fd;
+
+ if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
+ message(CONSOLE, "SIGHUP recived, but could not open proc file\r\n");
+ sleep(2);
+ return;
+ }
+ if (read(fd, rootpath, sizeof(rootpath)) == -1) {
+ message(CONSOLE, "SIGHUP recived, but could not read proc file\r\n");
+ sleep(2);
+ return;
+ }
+ close(fd);
+
+ if (rootpath[0] == '\0') {
+ message(CONSOLE, "SIGHUP recived, but new root is not valid: %s\r\n",
+ rootpath);
+ sleep(2);
+ return;
+ }
+
+ tc = strrchr(rootpath, '\n');
+ *tc = '\0';
+
+ /* Ok, making it this far means we commit */
+ message(CONSOLE, "Please stand by, changing root to `%s'.\r\n", rootpath);
+
+ /* kill all other programs first */
+ message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
+ kill(-1, SIGTERM);
+ sleep(2);
+ sync();
+
+ message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
+ kill(-1, SIGKILL);
+ sleep(2);
+ sync();
+
+ /* ok, we don't need /proc anymore. we also assume that the signaling
+ * process left the rest of the filesystems alone for us */
+ umount("/proc");
+
+ /* Ok, now we chroot. Hopefully we only have two things mounted, the
+ * new chroot'd mount point, and the old "/" mount. s,
+ * we go ahead and unmount the old "/". This should trigger the kernel
+ * to set things up the Right Way(tm). */
+
+ if (!chroot(rootpath))
+ umount("/dev/root");
+
+ /* If the chroot fails, we are already too far to turn back, so we
+ * continue and hope that executing init below will revive the system */
+
+ /* close all of our descriptors and open new ones */
+ close(0);
+ close(1);
+ close(2);
+ open("/dev/console", O_RDWR, 0);
+ dup(0);
+ dup(0);
+
+ message(CONSOLE, "Executing real init...\r\n");
+ /* execute init in the (hopefully) new root */
+ execve("/sbin/init",argv_init,envp_init);
+
+ message(CONSOLE, "ERROR: Could not exec new init. Hit ctrl+alt+delete to reboot.\r\n");
+ return;
+}
+#endif /* BB_FEATURE_INIT_CHROOT */
-void new_initAction (const struct initActionType *a,
- char* process, char* console)
+#endif /* ! DEBUG_INIT */
+
+void new_initAction (initActionEnum action,
+ char* process, char* cons)
{
initAction* newAction;
+
+ /* If BusyBox detects that a serial console is in use,
+ * then entries containing non-empty id fields will _not_ be run.
+ * The exception to this rule is the null device.
+ */
+ if (secondConsole == NULL && (*cons != '\0' || strncmp(cons, "null", 4)))
+ return;
+
newAction = calloc ((size_t)(1), sizeof(initAction));
if (!newAction) {
- fprintf(stderr, "Memory allocation failure\n");
+ message(LOG|CONSOLE,"Memory allocation failure\n");
while (1) sleep(1);
}
newAction->nextPtr = initActionList;
initActionList = newAction;
strncpy( newAction->process, process, 255);
- newAction->action = a->action;
- newAction->console = console;
+ newAction->action = action;
+ if (*cons != '\0') {
+ strncpy(newAction->console, cons, 255);
+ } else
+ strncpy(newAction->console, console, 255);
newAction->pid = 0;
+// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
+// newAction->process, newAction->action, newAction->console);
}
void delete_initAction (initAction *action)
}
}
+/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
+ * then parse_inittab() simply adds in some default
+ * actions(i.e runs INIT_SCRIPT and then starts a pair
+ * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
+ * _is_ defined, but /etc/inittab is missing, this
+ * results in the same set of default behaviors.
+ * */
void parse_inittab(void)
{
+#ifdef BB_FEATURE_USE_INITTAB
FILE* file;
- char buf[256];
- char *p, *q, *r;
+ char buf[256], lineAsRead[256], tmpConsole[256];
+ char *p, *q, *r, *s;
const struct initActionType *a = actions;
int foundIt;
file = fopen(INITTAB, "r");
if (file == NULL) {
/* No inittab file -- set up some default behavior */
-
+#endif
/* Askfirst shell on tty1 */
- new_initAction( &(actions[3]), SHELL, console );
+ new_initAction( ASKFIRST, SHELL, console );
/* Askfirst shell on tty2 */
- if (second_console != NULL)
- new_initAction( &(actions[3]), SHELL, second_console );
+ if (secondConsole != NULL)
+ new_initAction( ASKFIRST, SHELL, secondConsole );
/* sysinit */
- new_initAction( &(actions[0]), INIT_SCRIPT, console );
+ new_initAction( SYSINIT, INIT_SCRIPT, console );
return;
+#ifdef BB_FEATURE_USE_INITTAB
}
while ( fgets(buf, 255, file) != NULL) {
if (q != NULL)
*q='\0';
- /* Skip past the ID field and the runlevel
- * field (both are ignored) */
+ /* Keep a copy around for posterity's sake (and error msgs) */
+ strcpy(lineAsRead, buf);
+
+ /* Grab the ID field */
+ s=p;
p = strchr( p, ':');
+ if ( p != NULL || *(p+1) != '\0' ) {
+ *p='\0';
+ ++p;
+ }
/* Now peal off the process field from the end
* of the string */
q = strrchr( p, ':');
if ( q == NULL || *(q+1) == '\0' ) {
- fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
continue;
} else {
*q='\0';
/* Now peal off the action field */
r = strrchr( p, ':');
if ( r == NULL || *(r+1) == '\0') {
- fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
continue;
} else {
++r;
a = actions;
while (a->name != 0) {
if (strcmp(a->name, r) == 0) {
- new_initAction( a, q, NULL);
+ if (*s != '\0') {
+ struct stat statBuf;
+ strcpy(tmpConsole, "/dev/");
+ strncat(tmpConsole, s, 200);
+ if (stat(tmpConsole, &statBuf) != 0) {
+ message(LOG|CONSOLE, "device '%s' does not exist. Did you read the directions?\n", tmpConsole);
+ break;
+ }
+ s = tmpConsole;
+ }
+ new_initAction( a->action, q, s);
foundIt=TRUE;
}
a++;
continue;
else {
/* Choke on an unknown action */
- fprintf(stderr, "Bad inittab entry: %s\n", buf);
+ message(LOG|CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
}
}
return;
+#endif
}
-
extern int init_main(int argc, char **argv)
{
initAction *a;
int status;
#ifndef DEBUG_INIT
- /* Expect to be PID 1 iff we are run as init (not linuxrc) */
+ /* Expect to be PID 1 if we are run as init (not linuxrc) */
if (getpid() != 1 && strstr(argv[0], "init")!=NULL ) {
usage( "init\n\nInit is the parent of all processes.\n\n"
"This version of init is designed to be run only by the kernel\n");
}
+ /* Fix up argv[0] to be certain we claim to be init */
+ strncpy(argv[0], "init", strlen(argv[0]));
- /* from the controlling terminal */
- setsid();
-
- /* Set up sig handlers -- be sure to clear all of these in run() */
+ /* Set up sig handlers -- be sure to
+ * clear all of these in run() */
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal);
+#if defined BB_FEATURE_INIT_CHROOT
+ signal(SIGHUP, check_chroot);
+#endif
/* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */
reboot(RB_DISABLE_CAD);
#endif
-
+
/* Figure out where the default console should be */
console_init();
close(1);
close(2);
set_term(0);
+ setsid();
/* Make sure PATH is set to something sane */
putenv(_PATH_STDPATH);
-
/* Hello world */
#ifndef DEBUG_INIT
- message(CONSOLE|LOG,
+ message(LOG|CONSOLE,
"init started: BusyBox v%s (%s) multi-call binary\r\n",
BB_VER, BB_BT);
#else
- message(CONSOLE|LOG,
+ message(LOG|CONSOLE,
"init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
getpid(), BB_VER, BB_BT);
#endif
/* Mount /proc */
if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
- message(CONSOLE|LOG, "Mounting /proc: done.\n");
- kernel_version = get_kernel_revision();
+ message(LOG|CONSOLE, "Mounting /proc: done.\n");
+ kernelVersion = get_kernel_revision();
} else
- message(CONSOLE|LOG, "Mounting /proc: failed!\n");
+ message(LOG|CONSOLE, "Mounting /proc: failed!\n");
/* Make sure there is enough memory to do something useful. */
check_memory();
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1")))
{
/* Ask first then start a shell on tty2 */
- if (second_console != NULL)
- new_initAction( &(actions[3]), SHELL, second_console);
+ if (secondConsole != NULL)
+ new_initAction( ASKFIRST, SHELL, secondConsole);
/* Ask first then start a shell on tty1 */
- new_initAction( &(actions[3]), SHELL, console);
+ new_initAction( ASKFIRST, SHELL, console);
} else {
/* Not in single user mode -- see what inittab says */
+
+ /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
+ * then parse_inittab() simply adds in some default
+ * actions(i.e runs INIT_SCRIPT and then starts a pair
+ * of "askfirst" shells */
parse_inittab();
}
/* First run the sysinit command */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == SYSINIT) {
- waitfor(run(a->process, console, FALSE));
+ waitfor(a->process, a->console, FALSE);
/* Now remove the "sysinit" entry from the list */
delete_initAction( a);
}
/* Next run anything that wants to block */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == WAIT) {
- waitfor(run(a->process, console, FALSE));
+ waitfor(a->process, a->console, FALSE);
/* Now remove the "wait" entry from the list */
delete_initAction( a);
}
/* Next run anything to be run only once */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == ONCE) {
- run(a->process, console, FALSE);
+ run(a->process, a->console, FALSE);
/* Now remove the "once" entry from the list */
delete_initAction( a);
}
}
+ /* If there is nothing else to do, stop */
+ if (initActionList == NULL) {
+ message(LOG|CONSOLE, "No more tasks for init -- sleeping forever.\n");
+ while (1) sleep(1);
+ }
/* Now run the looping stuff for the rest of forever */
while (1) {
switch(a->action) {
case RESPAWN:
/* run the respawn stuff */
- a->pid = run(a->process, console, FALSE);
+ a->pid = run(a->process, a->console, FALSE);
break;
case ASKFIRST:
/* run the askfirst stuff */
- a->pid = run(a->process, console, TRUE);
+ a->pid = run(a->process, a->console, TRUE);
break;
/* silence the compiler's incessant whining */
default:
projects / oweals / busybox.git / blobdiff