int chpst_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
INIT_G();
if (applet_name[3] == 'd') envdir(argc, argv);
if (applet_name[1] == 'o') softlimit(argc, argv);
if (applet_name[0] == 's') setuidgid(argc, argv);
if (applet_name[0] == 'e') envuidgid(argc, argv);
// otherwise we are chpst
{
char *m,*d,*o,*p,*f,*c,*r,*t,*n;
getopt32(argv, "+u:U:e:m:d:o:p:f:c:r:t:/:n:vP012",
&set_user,&env_user,&env_dir,
&m,&d,&o,&p,&f,&c,&r,&t,&root,&n);
// if (option_mask32 & 0x1) // -u
// if (option_mask32 & 0x2) // -U
// if (option_mask32 & 0x4) // -e
if (option_mask32 & 0x8) limits = limitl = limita = limitd = xatoul(m); // -m
if (option_mask32 & 0x10) limitd = xatoul(d); // -d
if (option_mask32 & 0x20) limito = xatoul(o); // -o
if (option_mask32 & 0x40) limitp = xatoul(p); // -p
if (option_mask32 & 0x80) limitf = xatoul(f); // -f
if (option_mask32 & 0x100) limitc = xatoul(c); // -c
if (option_mask32 & 0x200) limitr = xatoul(r); // -r
if (option_mask32 & 0x400) limitt = xatoul(t); // -t
// if (option_mask32 & 0x800) // -/
if (option_mask32 & 0x1000) nicelvl = xatoi(n); // -n
// The below consts should match #defines at top!
//if (option_mask32 & 0x2000) OPT_verbose = 1; // -v
//if (option_mask32 & 0x4000) OPT_pgrp = 1; // -P
//if (option_mask32 & 0x8000) OPT_nostdin = 1; // -0
//if (option_mask32 & 0x10000) OPT_nostdout = 1; // -1
//if (option_mask32 & 0x20000) OPT_nostderr = 1; // -2
}
argv += optind;
if (!argv || !*argv) bb_show_usage();
if (OPT_pgrp) setsid();
if (env_dir) edir(env_dir);
if (root) {
xchdir(root);
xchroot(".");
}
slimit();
if (nicelvl) {
errno = 0;
if (nice(nicelvl) == -1)
bb_perror_msg_and_die("nice");
}
if (env_user) euidgid(env_user);
if (set_user) suidgid(set_user);
if (OPT_nostdin) close(0);
if (OPT_nostdout) close(1);
if (OPT_nostderr) close(2);
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("exec %s", argv[0]);
}
int switch_root_main(int argc UNUSED_PARAM, char **argv)
{
char *newroot, *console = NULL;
struct stat st1, st2;
struct statfs stfs;
dev_t rootdev;
// Parse args (-c console)
opt_complementary = "-2"; // minimum 2 params
getopt32(argv, "+c:", &console); // '+': stop parsing at first non-option
argv += optind;
// Change to new root directory and verify it's a different fs.
newroot = *argv++;
xchdir(newroot);
if (lstat(".", &st1) || lstat("/", &st2) || st1.st_dev == st2.st_dev) {
bb_error_msg_and_die("bad newroot %s", newroot);
}
rootdev = st2.st_dev;
// Additional sanity checks: we're about to rm -rf /, so be REALLY SURE
// we mean it. (I could make this a CONFIG option, but I would get email
// from all the people who WILL eat their filesystems.)
if (lstat("/init", &st1) || !S_ISREG(st1.st_mode) || statfs("/", &stfs)
|| (((unsigned)stfs.f_type != RAMFS_MAGIC) && ((unsigned)stfs.f_type != TMPFS_MAGIC))
|| (getpid() != 1)
) {
bb_error_msg_and_die("not rootfs");
}
// Zap everything out of rootdev
delete_contents("/", rootdev);
// Overmount / with newdir and chroot into it. The chdir is needed to
// recalculate "." and ".." links.
if (mount(".", "/", NULL, MS_MOVE, NULL))
bb_error_msg_and_die("error moving root");
xchroot(".");
xchdir("/");
// If a new console specified, redirect stdin/stdout/stderr to that.
if (console) {
close(0);
xopen(console, O_RDWR);
xdup2(0, 1);
xdup2(0, 2);
}
// Exec real init. (This is why we must be pid 1.)
execv(argv[0], argv);
bb_perror_msg_and_die("bad init %s", argv[0]);
}
int chroot_main(int argc UNUSED_PARAM, char **argv)
{
++argv;
if (!*argv)
bb_show_usage();
xchroot(*argv);
++argv;
if (!*argv) { /* no 2nd param (PROG), use shell */
argv -= 2;
argv[0] = (char *) get_shell_name();
argv[1] = (char *) "-i"; /* GNU coreutils 8.4 compat */
/*argv[2] = NULL; - already is */
}
BB_EXECVP_or_die(argv);
}
int chroot_main(int argc UNUSED_PARAM, char **argv)
{
++argv;
if (!*argv)
bb_show_usage();
xchroot(*argv);
xchdir("/");
++argv;
if (!*argv) { /* no 2nd param (PROG), use shell */
argv -= 2;
argv[0] = getenv("SHELL");
if (!argv[0]) {
argv[0] = (char *) DEFAULT_SHELL;
}
argv[1] = (char *) "-i";
}
BB_EXECVP(*argv, argv);
bb_perror_msg_and_die("can't execute '%s'", *argv);
}
int chroot_main(int argc UNUSED_PARAM, char **argv)
{
++argv;
if (!*argv)
bb_show_usage();
xchroot(*argv);
xchdir("/");
++argv;
if (!*argv) { /* no 2nd param (PROG), use shell */
argv -= 2;
argv[0] = getenv("SHELL");
if (!argv[0]) {
argv[0] = (char *) DEFAULT_SHELL;
}
argv[1] = (char *) "-i";
}
execvp(argv[0], argv);
xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
bb_perror_msg_and_die("can't execute '%s'", argv[0]);
}
int switch_root_main(int argc UNUSED_PARAM, char **argv)
{
char *newroot, *console = NULL;
struct stat st;
struct statfs stfs;
dev_t rootdev;
// Parse args (-c console)
opt_complementary = "-2"; // minimum 2 params
getopt32(argv, "+c:", &console); // '+': stop at first non-option
argv += optind;
newroot = *argv++;
// Change to new root directory and verify it's a different fs
xchdir(newroot);
xstat("/", &st);
rootdev = st.st_dev;
xstat(".", &st);
if (st.st_dev == rootdev || getpid() != 1) {
// Show usage, it says new root must be a mountpoint
// and we must be PID 1
bb_show_usage();
}
// Additional sanity checks: we're about to rm -rf /, so be REALLY SURE
// we mean it. I could make this a CONFIG option, but I would get email
// from all the people who WILL destroy their filesystems.
if (stat("/init", &st) != 0 || !S_ISREG(st.st_mode)) {
bb_error_msg_and_die("/init is not a regular file");
}
statfs("/", &stfs); // this never fails
if ((unsigned)stfs.f_type != RAMFS_MAGIC
&& (unsigned)stfs.f_type != TMPFS_MAGIC
) {
bb_error_msg_and_die("root filesystem is not ramfs/tmpfs");
}
// Zap everything out of rootdev
delete_contents("/", rootdev);
// Overmount / with newdir and chroot into it
if (mount(".", "/", NULL, MS_MOVE, NULL)) {
// For example, fails when newroot is not a mountpoint
bb_perror_msg_and_die("error moving root");
}
xchroot(".");
// The chdir is needed to recalculate "." and ".." links
/*xchdir("/"); - done in xchroot */
// If a new console specified, redirect stdin/stdout/stderr to it
if (console) {
close(0);
xopen(console, O_RDWR);
xdup2(0, 1);
xdup2(0, 2);
}
// Exec real init
execv(argv[0], argv);
bb_perror_msg_and_die("can't execute '%s'", argv[0]);
}
