3 files changed, 73 insertions, 3 deletions

diff --git a/include/applets.h b/include/applets.h
index e12f6027c..328848478 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -70,6 +70,7 @@ USE_CHATTR(APPLET(chattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHGRP(APPLET(chgrp, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHMOD(APPLET(chmod, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHOWN(APPLET(chown, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CHROOT(APPLET(chroot, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_CHVT(APPLET(chvt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CKSUM(APPLET(cksum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
@@ -106,6 +107,8 @@ USE_ED(APPLET(ed, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_GREP_EGREP_ALIAS(APPLET_NOUSAGE(egrep, grep, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_EJECT(APPLET(eject, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_ENV(APPLET(env, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_ENVDIR(APPLET_ODDNAME(envdir, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, envdir))
+USE_ENVUIDGID(APPLET_ODDNAME(envuidgid, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, envuidgid))
 USE_ETHER_WAKE(APPLET_ODDNAME(ether-wake, ether_wake, _BB_DIR_USR_BIN, _BB_SUID_NEVER, ether_wake))
 USE_EXPR(APPLET(expr, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FAKEIDENTD(APPLET(fakeidentd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
@@ -244,12 +247,14 @@ USE_SETCONSOLE(APPLET(setconsole, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SETKEYCODES(APPLET(setkeycodes, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SETLOGCONS(APPLET(setlogcons, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_SETSID(APPLET(setsid, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_SETUIDGID(APPLET_ODDNAME(setuidgid, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, setuidgid))
 USE_FEATURE_SH_IS_ASH(APPLET_NOUSAGE(sh, ash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_LASH(APPLET_NOUSAGE(sh, lash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_MSH(APPLET_NOUSAGE(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
 USE_SLEEP(APPLET(sleep, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_SOFTLIMIT(APPLET_ODDNAME(softlimit, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, softlimit))
 USE_SORT(APPLET(sort, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, _BB_DIR_SBIN, _BB_SUID_NEVER, start_stop_daemon))
 USE_STAT(APPLET(stat, _BB_DIR_BIN, _BB_SUID_NEVER))
diff --git a/include/libbb.h b/include/libbb.h
index b4516e99a..222b4acec 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -488,12 +488,13 @@ extern void renew_current_security_context(void);
 extern void set_current_security_context(security_context_t sid);
 #endif
 extern int run_parts(char **args, const unsigned char test_mode, char **env);
-extern int restricted_shell ( const char *shell );
-extern void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw );
-extern int correct_password ( const struct passwd *pw );
+extern int restricted_shell(const char *shell);
+extern void setup_environment(const char *shell, int loginshell, int changeenv, const struct passwd *pw);
+extern int correct_password(const struct passwd *pw);
 extern char *pw_encrypt(const char *clear, const char *salt);
 extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);
 
+extern void xsetenv(const char *key, const char *value);
 extern int xopen(const char *pathname, int flags);
 extern int xopen3(const char *pathname, int flags, int mode);
 extern void xread(int fd, void *buf, size_t count);
diff --git a/include/usage.h b/include/usage.h
index 40676c113..34b0566cd 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -215,6 +215,70 @@
         "ls -l /tmp/foo\n" \
         "-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"
 
+#define chpst_trivial_usage \
+        "[-vP012] [-u user[:group]] [-U user[:group]] [-e dir] " \
+        "[-/ dir] [-n nice] [-m bytes] [-d bytes] [-o files] " \
+        "[-p processes] [-f bytes] [-c bytes] prog args"
+#define chpst_full_usage \
+       "Change the process state and run specified program.\n\n" \
+       "-u user[:grp]   set uid and gid\n" \
+       "-U user[:grp]   set environment variables UID and GID\n" \
+       "-e dir          set environment variables as specified by files\n" \
+       "                in the directory: file=1st_line_of_file\n" \
+       "-/ dir          chroot to dir\n" \
+       "-n inc          add inc to nice value\n" \
+       "-m bytes        limit data segment, stack segment, locked physical pages,\n" \
+       "                and total of all segment per process to bytes bytes each\n" \
+       "-d bytes        limit data segment\n" \
+       "-o n            limit the number of open file descriptors per process to n\n" \
+       "-p n            limit number of processes per uid to n\n" \
+       "-f bytes        limit output file size to bytes bytes\n" \
+       "-c bytes        limit core file size to bytes bytes\n" \
+       "-v              verbose\n" \
+       "-P              run prog in a new process group\n" \
+       "-0              close standard input\n" \
+       "-1              close standard output\n" \
+       "-2              close standard error"
+#define setuidgid_trivial_usage \
+        "account prog args"
+#define setuidgid_full_usage \
+        "Sets uid and gid to account's uid and gid, removing all supplementary\n" \
+        "groups, then runs prog"
+#define envuidgid_trivial_usage \
+        "account prog args"
+#define envuidgid_full_usage \
+        "Sets $UID to account's uid and $GID to account's gid, then runs prog"
+#define envdir_trivial_usage \
+        "dir prog args"
+#define envdir_full_usage \
+        "Sets various environment variables as specified by files\n" \
+        "in the directory dir, then runs prog"
+#define softlimit_trivial_usage \
+        "[-a allbytes] [-c corebytes] [-d databytes] [-f filebytes] " \
+        "[-l lockbytes] [-m membytes] [-o openfiles] [-p processes] " \
+        "[-r residentbytes] [-s stackbytes] [-t cpusecs] prog args"
+#define softlimit_full_usage \
+        "Sets soft resource limits as specified by options, then runs prog\n" \
+        "\n" \
+        "-m n   Same as -d n -s n -l n -a n\n" \
+        "-d n   Limit the data segment per process to n bytes\n" \
+        "-s n   Limit the stack segment per process to n bytes\n" \
+        "-l n   Limit the locked physical pages per process to n bytes\n" \
+        "-a n   Limit the total of all segments per process to n bytes\n" \
+        "-o n   Limit  the number of open file descriptors per process to n\n" \
+        "-p n   Limit the number of processes per uid to n\n" \
+        "Options controlling file sizes:\n" \
+        "-f n   Limit output file sizes to n bytes\n" \
+        "-c n   Limit core file sizes to n bytes\n" \
+        "Efficiency opts:\n" \
+        "-r n   Limit the resident set size to n bytes. This limit is not\n" \
+        "       enforced unless physical memory is full\n" \
+        "-t n   Limit the CPU time to n seconds. This limit is not enforced\n" \
+        "       except that the process receives a SIGXCPU signal after n seconds\n" \
+        "\n" \
+        "Some options may have no effect on some operating systems\n" \
+        "n may be =, indicating that soft limit should be set equal to hard limit"
+
 #define chroot_trivial_usage \
         "NEWROOT [COMMAND...]"
 #define chroot_full_usage \