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574f2f4394
busybox/runit/chpst.c
Denis Vlasenko 394eebed66 lpd: spool mode added by Vladimir 
lpr: more robust error reporting
*: introduce and use xchroot
libbb: full_read/write now will report partial data counts prior to error
isdirectory.c: style fixes

lpd_main                                             249     486    +237
xchroot                                                -      29     +29
get_response_or_say_and_die                          110     139     +29
full_write                                            52      60      +8
full_read                                             55      63      +8
static.newline                                         1       -      -1
switch_root_main                                     404     400      -4
chpst_main                                          1089    1079     -10
getopt32                                            1370    1359     -11
chroot_main                                          115     101     -14
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 4/4 up/down: 311/-40)           Total: 271 bytes
   text    data     bss     dec     hex filename
 798472     728    7484  806684   c4f1c busybox_old
 798775     728    7484  806987   c504b busybox_unstripped
2008-02-25 20:30:24 +00:00

410 lines
10 KiB
C
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/*
Copyright (c) 2001-2006, Gerrit Pape
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
/* Dependencies on runit_lib.c removed */
#include "libbb.h"
#include <dirent.h>
// Must match constants in chpst_main!
#define OPT_verbose (option_mask32 & 0x2000)
#define OPT_pgrp (option_mask32 & 0x4000)
#define OPT_nostdin (option_mask32 & 0x8000)
#define OPT_nostdout (option_mask32 & 0x10000)
#define OPT_nostderr (option_mask32 & 0x20000)
struct globals {
char *set_user;
char *env_user;
const char *env_dir;
const char *root;
long limitd; /* limitX are initialized to -2 */
long limits;
long limitl;
long limita;
long limito;
long limitp;
long limitf;
long limitc;
long limitr;
long limitt;
int nicelvl;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define set_user (G.set_user)
#define env_user (G.env_user)
#define env_dir (G.env_dir )
#define root (G.root )
#define limitd (G.limitd )
#define limits (G.limits )
#define limitl (G.limitl )
#define limita (G.limita )
#define limito (G.limito )
#define limitp (G.limitp )
#define limitf (G.limitf )
#define limitc (G.limitc )
#define limitr (G.limitr )
#define limitt (G.limitt )
#define nicelvl (G.nicelvl )
#define INIT_G() do { \
long *p = &limitd; \
do *p++ = -2; while (p <= &limitt); \
} while (0)
static void suidgid(char *user)
{
struct bb_uidgid_t ugid;
if (!get_uidgid(&ugid, user, 1)) {
bb_error_msg_and_die("unknown user/group: %s", user);
}
if (setgroups(1, &ugid.gid) == -1)
bb_perror_msg_and_die("setgroups");
xsetgid(ugid.gid);
xsetuid(ugid.uid);
}
static void euidgid(char *user)
{
struct bb_uidgid_t ugid;
if (!get_uidgid(&ugid, user, 1)) {
bb_error_msg_and_die("unknown user/group: %s", user);
}
xsetenv("GID", utoa(ugid.gid));
xsetenv("UID", utoa(ugid.uid));
}
static void edir(const char *directory_name)
{
int wdir;
DIR *dir;
struct dirent *d;
int fd;
wdir = xopen(".", O_RDONLY | O_NDELAY);
xchdir(directory_name);
dir = opendir(".");
if (!dir)
bb_perror_msg_and_die("opendir %s", directory_name);
for (;;) {
errno = 0;
d = readdir(dir);
if (!d) {
if (errno)
bb_perror_msg_and_die("readdir %s",
directory_name);
break;
}
if (d->d_name[0] == '.')
continue;
fd = open(d->d_name, O_RDONLY | O_NDELAY);
if (fd < 0) {
if ((errno == EISDIR) && env_dir) {
if (OPT_verbose)
bb_perror_msg("warning: %s/%s is a directory",
directory_name, d->d_name);
continue;
} else
bb_perror_msg_and_die("open %s/%s",
directory_name, d->d_name);
}
if (fd >= 0) {
char buf[256];
char *tail;
int size;
size = safe_read(fd, buf, sizeof(buf)-1);
if (size < 0)
bb_perror_msg_and_die("read %s/%s",
directory_name, d->d_name);
if (size == 0) {
unsetenv(d->d_name);
continue;
}
buf[size] = '\n';
tail = memchr(buf, '\n', sizeof(buf));
/* skip trailing whitespace */;
while (1) {
if (tail[0] == ' ') tail[0] = '\0';
if (tail[0] == '\t') tail[0] = '\0';
if (tail[0] == '\n') tail[0] = '\0';
if (tail == buf) break;
tail--;
}
xsetenv(d->d_name, buf);
}
}
closedir(dir);
if (fchdir(wdir) == -1)
bb_perror_msg_and_die("fchdir");
close(wdir);
}
static void limit(int what, long l)
{
struct rlimit r;
if (getrlimit(what, &r) == -1)
bb_perror_msg_and_die("getrlimit");
if ((l < 0) || (l > r.rlim_max))
r.rlim_cur = r.rlim_max;
else
r.rlim_cur = l;
if (setrlimit(what, &r) == -1)
bb_perror_msg_and_die("setrlimit");
}
static void slimit(void)
{
if (limitd >= -1) {
#ifdef RLIMIT_DATA
limit(RLIMIT_DATA, limitd);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"DATA");
#endif
}
if (limits >= -1) {
#ifdef RLIMIT_STACK
limit(RLIMIT_STACK, limits);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"STACK");
#endif
}
if (limitl >= -1) {
#ifdef RLIMIT_MEMLOCK
limit(RLIMIT_MEMLOCK, limitl);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"MEMLOCK");
#endif
}
if (limita >= -1) {
#ifdef RLIMIT_VMEM
limit(RLIMIT_VMEM, limita);
#else
#ifdef RLIMIT_AS
limit(RLIMIT_AS, limita);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"VMEM");
#endif
#endif
}
if (limito >= -1) {
#ifdef RLIMIT_NOFILE
limit(RLIMIT_NOFILE, limito);
#else
#ifdef RLIMIT_OFILE
limit(RLIMIT_OFILE, limito);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"NOFILE");
#endif
#endif
}
if (limitp >= -1) {
#ifdef RLIMIT_NPROC
limit(RLIMIT_NPROC, limitp);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"NPROC");
#endif
}
if (limitf >= -1) {
#ifdef RLIMIT_FSIZE
limit(RLIMIT_FSIZE, limitf);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"FSIZE");
#endif
}
if (limitc >= -1) {
#ifdef RLIMIT_CORE
limit(RLIMIT_CORE, limitc);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"CORE");
#endif
}
if (limitr >= -1) {
#ifdef RLIMIT_RSS
limit(RLIMIT_RSS, limitr);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"RSS");
#endif
}
if (limitt >= -1) {
#ifdef RLIMIT_CPU
limit(RLIMIT_CPU, limitt);
#else
if (OPT_verbose)
bb_error_msg("system does not support RLIMIT_%s",
"CPU");
#endif
}
}
/* argv[0] */
static void setuidgid(int, char **) ATTRIBUTE_NORETURN;
static void envuidgid(int, char **) ATTRIBUTE_NORETURN;
static void envdir(int, char **) ATTRIBUTE_NORETURN;
static void softlimit(int, char **) ATTRIBUTE_NORETURN;
int chpst_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chpst_main(int argc, 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]);
}
static void setuidgid(int argc, char **argv)
{
const char *account;
account = *++argv;
if (!account) bb_show_usage();
if (!*++argv) bb_show_usage();
suidgid((char*)account);
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("exec %s", argv[0]);
}
static void envuidgid(int argc, char **argv)
{
const char *account;
account = *++argv;
if (!account) bb_show_usage();
if (!*++argv) bb_show_usage();
euidgid((char*)account);
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("exec %s", argv[0]);
}
static void envdir(int argc, char **argv)
{
const char *dir;
dir = *++argv;
if (!dir) bb_show_usage();
if (!*++argv) bb_show_usage();
edir(dir);
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("exec %s", argv[0]);
}
static void softlimit(int argc, char **argv)
{
char *a,*c,*d,*f,*l,*m,*o,*p,*r,*s,*t;
getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:",
&a,&c,&d,&f,&l,&m,&o,&p,&r,&s,&t);
if (option_mask32 & 0x001) limita = xatoul(a); // -a
if (option_mask32 & 0x002) limitc = xatoul(c); // -c
if (option_mask32 & 0x004) limitd = xatoul(d); // -d
if (option_mask32 & 0x008) limitf = xatoul(f); // -f
if (option_mask32 & 0x010) limitl = xatoul(l); // -l
if (option_mask32 & 0x020) limits = limitl = limita = limitd = xatoul(m); // -m
if (option_mask32 & 0x040) limito = xatoul(o); // -o
if (option_mask32 & 0x080) limitp = xatoul(p); // -p
if (option_mask32 & 0x100) limitr = xatoul(r); // -r
if (option_mask32 & 0x200) limits = xatoul(s); // -s
if (option_mask32 & 0x400) limitt = xatoul(t); // -t
argv += optind;
if (!argv[0]) bb_show_usage();
slimit();
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("exec %s", argv[0]);
}
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