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qubes-installer-qubes-os/anaconda/loader/init.c

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/*
* init.c: This is the install type init
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
* Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author(s): Erik Troan (ewt@redhat.com)
* Jeremy Katz (katzj@redhat.com)
*/
#if USE_MINILIBC
#include "minilibc.h"
#ifndef SOCK_STREAM
# define SOCK_STREAM 1
#endif
#define klogctl syslog
#else
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <execinfo.h>
#include <fcntl.h>
#include <net/if.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/klog.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>
#include <linux/vt.h>
#include <termios.h>
#include <libgen.h>
#include <glib.h>
#include "init.h"
#include "copy.h"
#include "devt.h"
#include "devices.h"
#endif
#include <asm/types.h>
#include <linux/serial.h>
#ifndef MS_REMOUNT
#define MS_REMOUNT 32
#endif
#define ENV_PATH 0
#define ENV_LD_LIBRARY_PATH 1
#define ENV_HOME 2
#define ENV_TERM 3
#define ENV_DEBUG 4
#define ENV_TERMINFO 5
#define ENV_PYTHONPATH 6
#define ENV_MALLOC_CHECK 7
#define ENV_MALLOC_PERTURB 8
char * env[] = {
"PATH=/usr/bin:/bin:/sbin:/usr/sbin:/mnt/sysimage/bin:"
"/mnt/sysimage/usr/bin:/mnt/sysimage/usr/sbin:/mnt/sysimage/sbin:"
"/mnt/sysimage/usr/X11R6/bin",
/* we set a nicer ld library path specifically for bash -- a full
one makes anaconda unhappy */
#if defined(__x86_64__) || defined(__s390x__) || defined(__powerpc64__)
"LD_LIBRARY_PATH=/lib64:/usr/lib64:/lib:/usr/lib",
#else
"LD_LIBRARY_PATH=/lib:/usr/lib",
#endif
"HOME=/",
"TERM=linux",
"DEBUG=",
"TERMINFO=/etc/linux-terminfo",
"PYTHONPATH=/tmp/updates",
"MALLOC_CHECK_=2",
"MALLOC_PERTURB_=204",
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
*
*/
void shutDown(int doKill, reboot_action rebootAction);
static int getKillPolicy(void);
static void getSyslog(char*);
struct termios ts;
static int expected_exit = 0;
static void doExit(int) __attribute__ ((noreturn));
static void doExit(int result)
{
expected_exit = 1;
exit(result);
}
static void printstr(char * string) {
int ret;
ret = write(1, string, strlen(string));
}
static void fatal_error(int usePerror) {
printf("failed.\n");
printf("\nI can't recover from this.\n");
#if !defined(__s390__) && !defined(__s390x__)
while (1) ;
#endif
}
/* sets up and launches syslog */
static void startSyslog(void) {
int conf_fd;
int ret;
char addr[128];
char forwardtcp[] = "*.* @@";
/* update the config file with command line arguments first */
getSyslog(addr);
if (strlen(addr) > 0) {
conf_fd = open("/etc/rsyslog.conf", O_WRONLY|O_APPEND);
if (conf_fd < 0) {
printf("error opening /etc/rsyslog.conf: %d\n", errno);
printf("syslog forwarding will not be enabled\n");
sleep(5);
} else {
ret = write(conf_fd, forwardtcp, strlen(forwardtcp));
ret = write(conf_fd, addr, strlen(addr));
ret = write(conf_fd, "\n", 1);
close(conf_fd);
}
}
/* rsyslog is going to take care of things, so disable console logging */
klogctl(8, NULL, 1);
/* now we really start the daemon. */
int status;
status = system("/sbin/rsyslogd -c 4");
if (status < 0 ||
!WIFEXITED(status) ||
WEXITSTATUS(status) != 0) {
printf("Unable to start syslog daemon.\n");
fatal_error(1);
}
}
static int setupTerminal(int fd) {
struct winsize winsize;
int fdn, len;
char buf[65535];
if (ioctl(fd, TIOCGWINSZ, &winsize)) {
printf("failed to get winsize");
fatal_error(1);
}
winsize.ws_row = 24;
winsize.ws_col = 80;
if (ioctl(fd, TIOCSWINSZ, &winsize)) {
printf("failed to set winsize");
fatal_error(1);
}
if (!strcmp(ttyname(fd), "/dev/hvc0")) {
/* using an HMC on a POWER system, use vt320 */
env[ENV_TERM] = "TERM=vt320";
} else {
/* use the no-advanced-video vt100 definition */
env[ENV_TERM] = "TERM=vt100-nav";
/* unless the user specifies that they want utf8 */
if ((fdn = open("/proc/cmdline", O_RDONLY, 0)) != -1) {
len = read(fdn, buf, sizeof(buf) - 1);
close(fdn);
if (len > 0 && strstr(buf, "utf8"))
env[ENV_TERM] = "TERM=vt100";
}
}
return 0;
}
#if defined(__sparc__)
static int termcmp(struct termios *a, struct termios *b) {
if (a->c_iflag != b->c_iflag || a->c_oflag != b->c_oflag ||
a->c_cflag != b->c_cflag || a->c_lflag != b->c_lflag)
return 1;
return memcmp(a->c_cc, b->c_cc, sizeof(a->c_cc));
}
#endif
#if !defined(__s390__) && !defined(__s390x__) && !defined(__sparc__)
static int termcmp(struct termios *a, struct termios *b) {
if (a->c_iflag != b->c_iflag || a->c_oflag != b->c_oflag ||
a->c_cflag != b->c_cflag || a->c_lflag != b->c_lflag ||
a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
return 1;
return memcmp(a->c_cc, b->c_cc, sizeof(a->c_cc));
}
#endif
static void createDevices(void) {
int i;
/* unset the umask so devices are created with correct perms
and not complemented by the previous umask call */
mode_t previous_umask = umask(0);
for (i = 0; devnodes[i].devname != NULL; i++) {
char devname[64];
int type = -1;
snprintf(devname, 63, "/dev/%s", devnodes[i].devname);
switch (devnodes[i].type) {
case DIRTYPE:
if (mkdir(devname, devnodes[i].perms) < 0) {
fprintf(stderr, "Unable to create directory %s: %m\n",
devname);
}
break;
case CHARDEV:
type = S_IFCHR;
break;
case BLOCKDEV:
type = S_IFBLK;
break;
}
if (type == -1) continue;
if (mknod(devname, type | devnodes[i].perms,
makedev(devnodes[i].major, devnodes[i].minor)) < 0)
fprintf(stderr, "Unable to create device %s: %m\n", devname);
}
/* Hurray for hacks, this stops /lib/udev/rules.d/65-md-incremental.rules
from medling with mdraid sets. */
i = creat("/dev/.in_sysinit", 0644);
close(i);
/* Restore umask for minimal side affects */
umask(previous_umask);
}
static void termReset(void) {
/* change to tty1 */
ioctl(0, VT_ACTIVATE, 1);
/* reset terminal */
tcsetattr(0, TCSANOW, &ts);
/* Shift in, default color, move down 100 lines */
/* ^O ^[[0m ^[[100E */
printf("\017\033[0m\033[100E\n");
}
/* reboot handler */
static void sigintHandler(int signum) {
termReset();
shutDown(getKillPolicy(), REBOOT);
}
/* halt handler */
static void sigUsr1Handler(int signum) {
termReset();
shutDown(getKillPolicy(), HALT);
}
/* poweroff handler */
static void sigUsr2Handler(int signum) {
termReset();
shutDown(getKillPolicy(), POWEROFF);
}
static int getKillPolicy(void) {
int fd;
int len;
char buf[1024];
/* look through /proc/cmdline for special options */
if ((fd = open("/proc/cmdline", O_RDONLY,0)) > 0) {
len = read(fd, buf, sizeof(buf) - 1);
close(fd);
if ((len > 0) && strstr(buf, "nokill"))
return 0;
}
return 1;
}
/* Looks through /proc/cmdline for remote syslog paramters. */
static void getSyslog(char *addr) {
int fd;
int len;
char buf[1024];
/* assume nothing gets found */
addr[0] = '\0';
if ((fd = open("/proc/cmdline", O_RDONLY,0)) <= 0) {
return;
}
len = read(fd, buf, sizeof(buf) - 1);
close(fd);
buf[len] = '\0';
/* Parse the command line into argument vector using glib */
int i;
int argc;
char** argv;
GError* err = NULL;
if (!g_shell_parse_argv(buf, &argc, &argv, &err )) {
g_error_free(err);
return;
}
for (i = 0; i < argc; ++i) {
/* find what we are looking for */
if (!strncmp(argv[i], "syslog=", 7)) {
strncpy(addr, argv[i] + 7, 127);
addr[127] = '\0';
break;
}
}
g_strfreev(argv);
/* address can be either a hostname or IPv4 or IPv6, with or without port;
thus we only allow the following characters in the address: letters and
digits, dots, colons, slashes, dashes and square brackets */
if (!g_regex_match_simple("^[\\w.:/\\-\\[\\]]*$", addr, 0, 0)) {
/* the parameter is malformed, disable its use */
addr[0] = '\0';
printf("The syslog= command line parameter is malformed and will be\n");
printf("ignored by the installer.\n");
sleep(5);
}
}
static int getInitPid(void) {
int fd = 0, pid = -1, ret;
char * buf = calloc(1, 10);
fd = open("/var/run/init.pid", O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Unable to find pid of init!!!\n");
return -1;
}
ret = read(fd, buf, 9);
close(fd);
ret = sscanf(buf, "%d", &pid);
return pid;
}
static void copyErrorFn (char *msg) {
printf(msg);
}
void initSegvHandler(int signum) {
void *array[30];
size_t i;
const char const * const errmsgs[] = {
"init received SIG",
"! Backtrace:\n",
"init exited unexpectedly! Backtrace:\n",
};
/* XXX This should really be in a glibc header somewhere... */
extern const char *const sys_sigabbrev[NSIG];
signal(signum, SIG_DFL); /* back to default */
if (signum == 0) {
i = write(STDERR_FILENO, errmsgs[2], strlen(errmsgs[2]));
} else {
i = write(STDERR_FILENO, errmsgs[0], strlen(errmsgs[0]));
i = write(STDERR_FILENO, sys_sigabbrev[signum],
strlen(sys_sigabbrev[signum]));
i = write(STDERR_FILENO, errmsgs[1], strlen(errmsgs[1]));
}
i = backtrace (array, 30);
backtrace_symbols_fd(array, i, STDERR_FILENO);
_exit(1);
}
void initExitHandler(void)
{
if (expected_exit)
return;
initSegvHandler(0);
}
static void setupBacktrace(void)
{
void *array;
signal(SIGSEGV, initSegvHandler);
signal(SIGABRT, initSegvHandler);
atexit(initExitHandler);
/* Turns out, there's an initializer at the top of backtrace() that
* (on some arches) calls dlopen(). dlopen(), unsurprisingly, calls
* malloc(). So, call backtrace() early in signal handler setup so
* we can later safely call it from the signal handler itself. */
backtrace(&array, 1);
}
int main(int argc, char **argv) {
pid_t installpid, childpid;
int waitStatus;
int fd = -1;
int doShutdown =0;
reboot_action shutdown_method = HALT;
int isSerial = 0;
char * console = NULL;
int doKill = 1;
char * argvc[15];
char ** argvp = argvc;
char twelve = 12;
struct serial_struct si;
int i, disable_keys;
if (!strncmp(basename(argv[0]), "poweroff", 8)) {
printf("Running poweroff...\n");
fd = getInitPid();
if (fd > 0)
kill(fd, SIGUSR2);
doExit(0);
} else if (!strncmp(basename(argv[0]), "halt", 4)) {
printf("Running halt...\n");
fd = getInitPid();
if (fd > 0)
kill(fd, SIGUSR1);
doExit(0);
} else if (!strncmp(basename(argv[0]), "reboot", 6)) {
printf("Running reboot...\n");
fd = getInitPid();
if (fd > 0)
kill(fd, SIGINT);
doExit(0);
}
/* turn off screen blanking */
printstr("\033[9;0]");
printstr("\033[8]");
umask(022);
/* set up signal handler */
setupBacktrace();
printstr("\nGreetings.\n");
printf("anaconda installer init version %s starting\n", VERSION);
printf("mounting /proc filesystem... ");
if (mount("/proc", "/proc", "proc", 0, NULL))
fatal_error(1);
printf("done\n");
printf("creating /dev filesystem... ");
if (mount("/dev", "/dev", "tmpfs", 0, NULL))
fatal_error(1);
createDevices();
printf("done\n");
printf("starting udev...");
if ((childpid = fork()) == 0) {
execl("/sbin/udevd", "/sbin/udevd", "--daemon", NULL);
exit(1);
}
/* wait at least until the udevd process that we forked exits */
do {
pid_t retpid;
int waitstatus;
retpid = waitpid(childpid, &waitstatus, 0);
if (retpid == -1) {
if (errno == EINTR)
continue;
/* if the child exited before we called waitpid, we can get
* ECHILD without anything really being wrong; we just lost
* the race.*/
if (errno == ECHILD)
break;
printf("init: error waiting on udevd: %m\n");
exit(1);
} else if (WIFEXITED(waitstatus)) {
break;
}
} while (1);
if (fork() == 0) {
execl("/sbin/udevadm", "udevadm", "control", "--env=ANACONDA=1", NULL);
exit(1);
}
printf("done\n");
printf("mounting /dev/pts (unix98 pty) filesystem... ");
if (mount("/dev/pts", "/dev/pts", "devpts", 0, NULL))
fatal_error(1);
printf("done\n");
printf("mounting /sys filesystem... ");
if (mount("/sys", "/sys", "sysfs", 0, NULL))
fatal_error(1);
printf("done\n");
/* these args are only for testing from commandline */
for (i = 1; i < argc; i++) {
if (!strcmp (argv[i], "serial")) {
isSerial = 1;
break;
}
}
doKill = getKillPolicy();
#if !defined(__s390__) && !defined(__s390x__)
static struct termios orig_cmode;
struct termios cmode, mode;
int cfd;
cfd = open("/dev/console", O_RDONLY);
tcgetattr(cfd,&orig_cmode);
close(cfd);
cmode = orig_cmode;
cmode.c_lflag &= (~ECHO);
cfd = open("/dev/console", O_WRONLY);
tcsetattr(cfd,TCSANOW,&cmode);
close(cfd);
/* handle weird consoles */
#if defined(__powerpc__)
char * consoles[] = { "/dev/hvc0", /* hvc for JS20 */
"/dev/hvsi0", "/dev/hvsi1",
"/dev/hvsi2", /* hvsi for POWER5 */
NULL };
#elif defined (__ia64__)
char * consoles[] = { "/dev/ttySG0", "/dev/xvc0", "/dev/hvc0", NULL };
#elif defined (__i386__) || defined (__x86_64__)
char * consoles[] = { "/dev/xvc0", "/dev/hvc0", NULL };
#else
char * consoles[] = { NULL };
#endif
for (i = 0; consoles[i] != NULL; i++) {
if ((fd = open(consoles[i], O_RDWR)) >= 0 && !tcgetattr(fd, &mode) && !termcmp(&cmode, &mode)) {
printf("anaconda installer init version %s using %s as console\n",
VERSION, consoles[i]);
isSerial = 3;
console = strdup(consoles[i]);
break;
}
close(fd);
}
cfd = open("/dev/console", O_WRONLY);
tcsetattr(cfd,TCSANOW,&orig_cmode);
close(cfd);
if ((fd < 0) && (ioctl (0, TIOCLINUX, &twelve) < 0)) {
isSerial = 2;
if (ioctl(0, TIOCGSERIAL, &si) == -1) {
isSerial = 0;
}
}
if (isSerial && (isSerial != 3)) {
char *device = "/dev/ttyS0";
printf("anaconda installer init version %s using a serial console\n",
VERSION);
if (isSerial == 2)
device = "/dev/console";
fd = open(device, O_RDWR, 0);
if (fd < 0)
device = "/dev/tts/0";
if (fd < 0) {
printf("failed to open %s\n", device);
fatal_error(1);
}
setupTerminal(fd);
} else if (isSerial == 3) {
setupTerminal(fd);
} else if (fd < 0) {
fd = open("/dev/tty1", O_RDWR, 0);
if (fd < 0)
fd = open("/dev/vc/1", O_RDWR, 0);
if (fd < 0) {
printf("failed to open /dev/tty1 and /dev/vc/1");
fatal_error(1);
}
}
setsid();
if (ioctl(0, TIOCSCTTY, NULL)) {
printf("could not set new controlling tty\n");
}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
#else
dup2(0, 1);
dup2(0, 2);
#endif
/* disable Ctrl+Z, Ctrl+C, etc ... but not in rescue mode */
disable_keys = 1;
if (argc > 1)
if (strstr(argv[1], "rescue"))
disable_keys = 0;
if (disable_keys) {
tcgetattr(0, &ts);
ts.c_iflag &= ~BRKINT;
ts.c_iflag |= IGNBRK;
ts.c_iflag &= ~ISIG;
tcsetattr(0, TCSANOW, &ts);
}
int ret;
ret = sethostname("localhost.localdomain", 21);
/* the default domainname (as of 2.0.35) is "(none)", which confuses
glibc */
ret = setdomainname("", 0);
printf("trying to remount root filesystem read write... ");
if (mount("/", "/", "ext2", MS_REMOUNT | MS_MGC_VAL, NULL)) {
fatal_error(1);
}
printf("done\n");
/* we want our /tmp to be tmpfs, but we also want to let people hack
* their initrds to add things like a ks.cfg, so this has to be a little
* tricky */
rename("/tmp", "/oldtmp");
mkdir("/tmp", 0755);
printf("mounting /tmp as tmpfs... ");
if (mount("none", "/tmp", "tmpfs", 0, "size=250m"))
fatal_error(1);
printf("done\n");
copyDirectory("/oldtmp", "/tmp", copyErrorFn, copyErrorFn);
unlink("/oldtmp");
/* Now we have some /tmp space set up, and /etc and /dev point to
it. We should be in pretty good shape. */
startSyslog();
/* write out a pid file */
if ((fd = open("/var/run/init.pid", O_WRONLY|O_CREAT, 0644)) > 0) {
char * buf = malloc(10);
int ret;
snprintf(buf, 9, "%d", getpid());
ret = write(fd, buf, strlen(buf));
close(fd);
free(buf);
} else {
printf("unable to write init.pid (%d): %m\n", errno);
sleep(2);
}
/* D-Bus */
if (fork() == 0) {
execl("/sbin/dbus-uuidgen", "/sbin/dbus-uuidgen", "--ensure", NULL);
doExit(1);
}
if (fork() == 0) {
execl("/sbin/dbus-daemon", "/sbin/dbus-daemon", "--system", NULL);
doExit(1);
}
sleep(2);
/* Go into normal init mode - keep going, and then do a orderly shutdown
when:
1) /bin/install exits
2) we receive a SIGHUP
*/
printf("running install...\n");
setsid();
if (!(installpid = fork())) {
/* child */
*argvp++ = "/sbin/loader";
if (isSerial == 3) {
*argvp++ = "--virtpconsole";
*argvp++ = console;
}
*argvp++ = NULL;
printf("running %s\n", argvc[0]);
execve(argvc[0], argvc, env);
shutDown(1, HALT);
}
/* signal handlers for halt/poweroff */
signal(SIGUSR1, sigUsr1Handler);
signal(SIGUSR2, sigUsr2Handler);
/* set up the ctrl+alt+delete handler to kill our pid, not pid 1 */
signal(SIGINT, sigintHandler);
if ((fd = open("/proc/sys/kernel/cad_pid", O_WRONLY)) != -1) {
char buf[7];
size_t count;
sprintf(buf, "%d", getpid());
count = write(fd, buf, strlen(buf));
close(fd);
/* if we succeeded in writing our pid, turn off the hard reboot
ctrl-alt-del handler */
if (count == strlen(buf) &&
(fd = open("/proc/sys/kernel/ctrl-alt-del", O_WRONLY)) != -1) {
int ret;
ret = write(fd, "0", 1);
close(fd);
}
}
while (!doShutdown) {
pid_t childpid;
childpid = waitpid(-1, &waitStatus, 0);
if (childpid == installpid) {
doShutdown = 1;
ioctl(0, VT_ACTIVATE, 1);
}
}
if (!WIFEXITED(waitStatus) ||
(WIFEXITED(waitStatus) && WEXITSTATUS(waitStatus))) {
shutdown_method = DELAYED_REBOOT;
printf("install exited abnormally [%d/%d] ", WIFEXITED(waitStatus),
WEXITSTATUS(waitStatus));
if (WIFSIGNALED(waitStatus)) {
printf("-- received signal %d", WTERMSIG(waitStatus));
}
printf("\n");
} else {
shutdown_method = REBOOT;
}
shutDown(doKill, shutdown_method);
return 0;
}
/* vim:tw=78:ts=4:et:sw=4
*/
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