summaryrefslogtreecommitdiffstats
path: root/mdk-stage1/init.c
blob: 58dc64bd8fc7dad8ce80ff8795086c57d7dfddc2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
/*
 * Guillaume Cottenceau (gc@mandrakesoft.com)
 *
 * Copyright 2000 MandrakeSoft
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/*
 * Portions from Erik Troan (ewt@redhat.com)
 *
 * Copyright 1996 Red Hat Software 
 *
 */

#ifndef INIT_HEADERS
#include "init-libc-headers.h"
#else
#include INIT_HEADERS
#endif

#include "config-stage1.h"
#include <linux/cdrom.h>

#if defined(__powerpc__)
#define TIOCSCTTY     0x540E
#endif

char * env[] = {
	"PATH=/usr/bin:/bin:/sbin:/usr/sbin:/mnt/sbin:/mnt/usr/sbin:/mnt/bin:/mnt/usr/bin",
	"LD_LIBRARY_PATH=/lib:/usr/lib:/mnt/lib:/mnt/usr/lib:/usr/X11R6/lib:/mnt/usr/X11R6/lib"
#if defined(__x86_64__) || defined(__ppc64__)
	":/lib64:/usr/lib64:/usr/X11R6/lib64:/mnt/lib64:/mnt/usr/lib64:/mnt/usr/X11R6/lib64"
#endif
	,
	"HOME=/",
	"TERM=linux",
	"TERMINFO=/etc/terminfo",
	NULL
};


/* 
 * this needs to handle the following cases:
 *
 *	1) run from a CD root filesystem
 *	2) run from a read only nfs rooted filesystem
 *      3) run from a floppy
 *	4) run from a floppy that's been loaded into a ramdisk 
 *
 */

int testing = 0;
int klog_pid;


void fatal_error(char *msg)
{
	printf("FATAL ERROR IN INIT: %s\n\nI can't recover from this, please reboot manually and send bugreport.\n", msg);
        select(0, NULL, NULL, NULL, NULL);
}

void print_error(char *msg)
{
	printf("E: %s\n", msg);
}

void print_warning(char *msg)
{
	printf("W: %s\n", msg);
}

void print_int_init(int fd, int i)
{
	char buf[10];
	char * chptr = buf + 9;
	int j = 0;
	
	if (i < 0)
	{
		write(1, "-", 1);
		i = -1 * i;
	}
	
	while (i)
	{
		*chptr-- = '0' + (i % 10);
		j++;
		i = i / 10;
	}
	
	write(fd, chptr + 1, j);
}

void print_str_init(int fd, char * string)
{
	write(fd, string, strlen(string));
}

/* fork to:
 *   (1) watch /proc/kmsg and copy the stuff to /dev/tty4
 *   (2) listens to /dev/log and copy also this stuff (log from programs)
 */
void doklog()
{
	fd_set readset, unixs;
	int in, out, i;
	int log;
	int s;
	int sock = -1;
	struct sockaddr_un sockaddr;
	char buf[1024];
	int readfd;

	/* open kernel message logger */
	in = open("/proc/kmsg", O_RDONLY,0);
	if (in < 0) {
		print_error("could not open /proc/kmsg");
		return;
	}

        mkdir("/tmp", 0755);
	if ((log = open("/tmp/syslog", O_WRONLY | O_CREAT, 0644)) < 0) {
		print_error("error opening /tmp/syslog");
		sleep(5);
		return;
	}

	if ((klog_pid = fork())) {
		close(in);
		close(log);
		return;
	} else {
		close(0); 
		close(1);
		close(2);
	}
	
	out = open("/dev/tty4", O_WRONLY, 0);
	if (out < 0) 
		print_warning("couldn't open tty for syslog -- still using /tmp/syslog\n");

	/* now open the syslog socket */
// ############# LINUX 2.4 /dev/log IS BUGGED! --> apparently the syslogs can't reach me, and it's full up after a while
//	  sockaddr.sun_family = AF_UNIX;
//	  strncpy(sockaddr.sun_path, "/dev/log", UNIX_PATH_MAX);
//	  sock = socket(AF_UNIX, SOCK_STREAM, 0);
//	  if (sock < 0) {
//		  printf("error creating socket: %d\n", errno);
//		  sleep(5);
//	  }
//
//	  print_str_init(log, "] got socket\n");
//	  if (bind(sock, (struct sockaddr *) &sockaddr, sizeof(sockaddr.sun_family) + strlen(sockaddr.sun_path)))	{
//		  print_str_init(log, "] bind error: ");
//		  print_int_init(log, errno);
//		  print_str_init(log, "\n");
//		  sleep(//	  }
//
//	  print_str_init(log, "] bound socket\n");
//	  chmod("/dev/log", 0666);
//	  if (listen(sock, 5)) {
//		  print_str_init(log, "] listen error: ");
//		  print_int_init(log, errno);
//		  print_str_init(log, "\n");
//		  sleep(5);
//	  }

	/* disable on-console syslog output */
	syslog(8, NULL, 1);

	print_str_init(log, "] kernel/system logger ok\n");
	FD_ZERO(&unixs);
	while (1) {
		memcpy(&readset, &unixs, sizeof(unixs));

		if (sock >= 0)
			FD_SET(sock, &readset);
		FD_SET(in, &readset);
		
		i = select(20, &readset, NULL, NULL, NULL);
		if (i <= 0)
			continue;

		/* has /proc/kmsg things to tell us? */
		if (FD_ISSET(in, &readset)) {
			i = read(in, buf, sizeof(buf));
			if (i > 0) {
				if (out >= 0)
					write(out, buf, i);
				write(log, buf, i);
			}
		} 

		/* examine some fd's in the hope to find some syslog outputs from programs */
		for (readfd = 0; readfd < 20; ++readfd) {
			if (FD_ISSET(readfd, &readset) && FD_ISSET(readfd, &unixs)) {
				i = read(readfd, buf, sizeof(buf));
				if (i > 0) {
					/* grep out the output of RPM telling that it installed/removed some packages */
					if (!strstr(buf, "mdk installed") && !strstr(buf, "mdk removed")) {
						if (out >= 0)
							write(out, buf, i);
						write(log, buf, i);
					}
				} else if (i == 0) {
					/* socket closed */
					close(readfd);
					FD_CLR(readfd, &unixs);
				}
			}
		}

		/* the socket has moved, new stuff to do */
		if (sock >= 0 && FD_ISSET(sock, &readset)) {
			s = sizeof(sockaddr);
			readfd = accept(sock, (struct sockaddr *) &sockaddr, &s);
			if (readfd < 0) {
				char * msg_error = "] error in accept\n";
				if (out >= 0)
					write(out, msg_error, strlen(msg_error));
				write(log, msg_error, strlen(msg_error));
				close(sock);
				sock = -1;
			}
			else
				FD_SET(readfd, &unixs);
		}
	}
}


#define LOOP_CLR_FD	0x4C01

void del_loops(void) 
{
        char loopdev[] = "/dev/loop0";
        char chloopdev[] = "/dev/chloop0";
        int i;
        for (i=0; i<8; i++) {
                int fd;
                loopdev[9] = '0' + i;
                fd = open(loopdev, O_RDONLY, 0);
                if (fd > 0) {
                        if (!ioctl(fd, LOOP_CLR_FD, 0))
                                printf("\t%s\n", loopdev);
                        close(fd);
                }
                chloopdev[11] = '0' + i;
                fd = open(chloopdev, O_RDONLY, 0);
                if (fd > 0) {
                        if (!ioctl(fd, LOOP_CLR_FD, 0))
                                printf("\t%s\n", chloopdev);
                        close(fd);
                }
        }
}

struct filesystem
{
	char * dev;
	char * name;
	char * fs;
	int mounted;
};

char* strcat(register char* s,register const char* t)
{
  char *dest=s;
  s+=strlen(s);
  for (;;) {
    if (!(*s = *t)) break; ++s; ++t;
  }
  return dest;
}

/* attempt to unmount all filesystems in /proc/mounts */
void unmount_filesystems(void)
{
	int fd, size;
	char buf[65535];			/* this should be big enough */
	char *p;
	struct filesystem fs[500];
	int numfs = 0;
	int i, nb;
	int disallow_eject = 0;

	printf("unmounting filesystems...\n"); 
	
	fd = open("/proc/mounts", O_RDONLY, 0);
	if (fd < 1) {
		print_error("failed to open /proc/mounts");
		sleep(2);
		return;
	}

	size = read(fd, buf, sizeof(buf) - 1);
	buf[size] = '\0';

	close(fd);

	p = buf;
	while (*p) {
		fs[numfs].mounted = 1;
		fs[numfs].dev = p;
		while (*p != ' ') p++;
		*p++ = '\0';
		fs[numfs].name = p;
		while (*p != ' ') p++;
		*p++ = '\0';
		fs[numfs].fs = p;
		while (*p != ' ') p++;
		*p++ = '\0';
		while (*p != '\n') p++;
		p++;
                if (!strcmp(fs[numfs].fs, "nfs"))
                        disallow_eject = 1;
		if (strcmp(fs[numfs].name, "/")
                    && !strstr(fs[numfs].dev, "ram")
                    && strcmp(fs[numfs].name, "/dev")
                    && strcmp(fs[numfs].name, "/sys")
                    && strncmp(fs[numfs].name, "/proc", 5))
                        numfs++;
	}

	/* Pixel's ultra-optimized sorting algorithm:
	   multiple passes trying to umount everything until nothing moves
	   anymore (a.k.a holy shotgun method) */
	do {
		nb = 0;
		for (i = 0; i < numfs; i++) {
			/*printf("trying with %s\n", fs[i].name);*/
                        del_loops();
			if (fs[i].mounted && umount(fs[i].name) == 0) { 
				printf("\t%s\n", fs[i].name);
				fs[i].mounted = 0;
				nb++;
			}
		}
	} while (nb);
	
	for (i = nb = 0; i < numfs; i++)
		if (fs[i].mounted) {
#ifdef MANDRAKE_MOVE
                        if (!strcmp(fs[i].name, "/cdrom") || !strcmp(fs[i].name, "/image_always"))
                                continue;
#endif
			printf("\tumount failed: %s\n", fs[i].name);
			if (strcmp(fs[i].fs, "ext2") == 0) nb++; /* don't count not-ext2 umount failed */
		}

#ifdef MANDRAKE_MOVE
        if (!disallow_eject) {
                fd = open("/proc/fs/supermount/subfs", O_RDONLY, 0);
                if (fd > 0) {
                        char devices[100][100];
                        int i = 0;
                        char * ptr1, * ptr2;
                        size = read(fd, buf, sizeof(buf) - 1);
                        buf[size] = '\0';
                        close(fd);
                        ptr1 = buf;
                        ptr2 = buf;
                        while (*ptr1 && *ptr2) {
                                char * ptrf = ptr1;
                                while (*ptr2 && *ptr2 != '\n')
                                        ptr2++;
                                while (*ptrf && *ptrf != ' ')
                                        ptrf++;
                                if (*ptrf)
                                        *ptrf = '\0';
                                strcpy(devices[i], ptr1);
                                i++;
                                if (*ptr2)
                                        ptr2++;
                                ptr1 = ptr2;
                        }
                        while (i >= 1) {
                                i--;
                                strcat(devices[i], " release force");
                                fd = open("/proc/fs/supermount/subfs", O_WRONLY, 0);
                                write(fd, devices[i], strlen(devices[i]));
                                close(fd);
                        }
                }
                fd = open("/dev/cdrom", O_RDONLY|O_NONBLOCK, 0);
                if (fd > 0) {
                        ioctl(fd, CDROM_LOCKDOOR, 0);
                        close(fd);
                }
                fd = open("/dev/cdrom", O_RDONLY|O_NONBLOCK, 0);
                if (fd > 0) {
                        ioctl(fd, CDROMEJECT, 0);
                        close(fd);
                }
        }
#endif
	
	if (nb) {
		printf("failed to umount some filesystems\n");
                select(0, NULL, NULL, NULL, NULL);
	}
}

#define BMAGIC_HARD	0x89ABCDEF
#define BMAGIC_SOFT	0
#define BMAGIC_REBOOT	0x01234567
#define BMAGIC_HALT	0xCDEF0123
#define BMAGIC_POWEROFF	0x4321FEDC
int reboot_magic = BMAGIC_REBOOT;

int in_reboot(void)
{
        int fd;
        if ((fd = open("/var/run/rebootctl", O_RDONLY, 0)) > 0) {
                char buf[100];
                int i = read(fd, buf, sizeof(buf));
                close(fd);
                if (strstr(buf, "halt"))
                        reboot_magic = BMAGIC_POWEROFF;
                return i > 0;
        }
        return 0;
}

int exit_value_proceed = 66;

int main(int argc, char **argv)
{
	pid_t installpid, childpid;
	int wait_status;
	int fd;
	int abnormal_termination = 0;
	int end_stage2 = 0;

        if (argc > 1 && argv[1][0] >= '0' && argv[1][0] <= '9') {
                printf("This is no normal init, sorry.\n"
                       "Call `reboot' or `halt' directly.\n");
                return 0;
        }

	if (!testing) {
		/* turn off screen blanking */
		printf("\033[9;0]");
		printf("\033[8]");
	}
	else
		printf("*** TESTING MODE *** (pid is %d)\n", getpid());


	if (!testing) {
                mkdir("/proc", 0755);
		if (mount("/proc", "/proc", "proc", 0, NULL))
			fatal_error("Unable to mount proc filesystem");
	}
	

	/* ignore Control-C and keyboard stop signals */
	signal(SIGINT, SIG_IGN);
	signal(SIGTSTP, SIG_IGN);

#ifdef MANDRAKE_MOVE
        /* disallow Ctrl Alt Del to reboot */
        reboot(0xfee1dead, 672274793, BMAGIC_SOFT);
#endif

	if (!testing) {
		fd = open("/dev/console", O_RDWR, 0);
		if (fd < 0)
			fatal_error("failed to open /dev/console");
		
		dup2(fd, 0);
		dup2(fd, 1);
		dup2(fd, 2);
		close(fd);
	}
		

	/* I set me up as session leader (probably not necessary?) */
	setsid();
//	if (ioctl(0, TIOCSCTTY, NULL))
//		print_error("could not set new controlling tty");

	if (!testing) {
		char my_hostname[] = "localhost.localdomain";
		sethostname(my_hostname, sizeof(my_hostname));
		/* the default domainname (as of 2.0.35) is "(none)", which confuses 
		   glibc */
		setdomainname("", 0);
	}

	if (!testing) 
		doklog();

	/* Go into normal init mode - keep going, and then do a orderly shutdown
	   when:
	   
	   1) install exits
	   2) we receive a SIGHUP 
	*/

	if (!(installpid = fork())) {
		/* child */
		char * child_argv[2];
		child_argv[0] = BINARY;
		child_argv[1] = NULL;

		execve(child_argv[0], child_argv, env);
		printf("error in exec of %s :-( [%d]\n", BINARY, errno);
		return 0;
	}

	while (!end_stage2) {
		childpid = wait4(-1, &wait_status, 0, NULL);
		if (childpid == installpid)
			end_stage2 = 1;
	}

        /* allow Ctrl Alt Del to reboot */
        reboot(0xfee1dead, 672274793, BMAGIC_HARD);

        if (in_reboot()) {
                // any exitcode is valid if we're in_reboot
        } else if (!WIFEXITED(wait_status) || (WEXITSTATUS(wait_status) != 0 && WEXITSTATUS(wait_status) != exit_value_proceed)) {
		printf("exited abnormally :-( ");
		if (WIFSIGNALED(wait_status))
			printf("-- received signal %d", WTERMSIG(wait_status));
		printf("\n");
		abnormal_termination = 1;
	} else if (WIFEXITED(wait_status) && WEXITSTATUS(wait_status) == exit_value_proceed) {
		kill(klog_pid, 9);
		printf("proceeding, please wait...\n");
		return 0;
        }

        if (!abnormal_termination) {
                int i;
                for (i=0; i<50; i++)
                        printf("\n");  /* cleanup startkde messages */
        }

	if (testing)
		return 0;

	sync(); sync();
	sleep(2);

	printf("sending termination signals...");
	kill(-1, 15);
	sleep(2);
	printf("done\n");

	printf("sending kill signals...");
	kill(-1, 9);
	sleep(2);
	printf("done\n");

	unmount_filesystems();

	sync(); sync();

	if (!abnormal_termination) {
                if (reboot_magic == BMAGIC_REBOOT) {
#ifdef DEBUG
                        printf("automatic reboot in 10 seconds\n");
                        sleep(10);
#endif
                        reboot(0xfee1dead, 672274793, reboot_magic);
                } else {
                        printf("you may safely poweroff your computer now\n");
                }
	} else {
		printf("you may safely reboot or halt your system\n");
	}

        select(0, NULL, NULL, NULL, NULL);
	return 0;
}