8 files changed, 833 insertions, 0 deletions

diff --git a/applets/Kbuild b/applets/Kbuild
new file mode 100644
index 000000000..c95c09d97
--- /dev/null
+++ b/applets/Kbuild
@@ -0,0 +1,21 @@
+# Makefile for busybox
+#
+# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
+#
+# Licensed under the GPL v2, see the file LICENSE in this tarball.
+
+obj-y:=
+obj-y   += applets.o
+obj-y   += busybox.o
+
+# Generated file needs additional love
+
+applets/applets.o: include/usage_compressed.h
+
+hostprogs-y += usage
+always := $(hostprogs-y)
+HOSTCFLAGS_usage.o = -I$(srctree)/include
+
+include/usage_compressed.h: $(srctree)/include/usage.h applets/usage
+        @echo '  GEN     include/usage_compressed.h'
+        @$(srctree)/applets/usage_compressed include/usage_compressed.h applets
diff --git a/applets/applets.c b/applets/applets.c
new file mode 100644
index 000000000..23f9e4f92
--- /dev/null
+++ b/applets/applets.c
@@ -0,0 +1,483 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks.  Tracking down who wrote what
+ * isn't something I'm going to worry about...  If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
+ */
+
+#include "busybox.h"
+#include <unistd.h>
+#include <string.h>
+#include <assert.h>
+
+/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
+#if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
+#warning Static linking against glibc produces buggy executables
+#warning (glibc does not cope well with ld --gc-sections).
+#warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
+#warning Note that glibc is utterly unsuitable for static linking anyway.
+#endif
+
+#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
+static const char usage_messages[] =
+#define MAKE_USAGE
+#include "usage.h"
+#include "applets.h"
+;
+#undef MAKE_USAGE
+#else
+#define usage_messages 0
+#endif /* ENABLE_SHOW_USAGE */
+
+#undef APPLET
+#undef APPLET_NOUSAGE
+#undef PROTOTYPES
+#include "applets.h"
+
+static struct BB_applet *applet_using;
+
+/* The -1 arises because of the {0,NULL,0,-1} entry above. */
+const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
+
+
+#ifdef CONFIG_FEATURE_SUID_CONFIG
+
+#include <ctype.h>
+
+#define CONFIG_FILE "/etc/busybox.conf"
+
+/* applets [] is const, so we have to define this "override" structure */
+static struct BB_suid_config
+{
+        struct BB_applet *m_applet;
+
+        uid_t m_uid;
+        gid_t m_gid;
+        mode_t m_mode;
+
+        struct BB_suid_config *m_next;
+} *suid_config;
+
+static int suid_cfg_readable;
+
+/* check if u is member of group g */
+static int ingroup(uid_t u, gid_t g)
+{
+        struct group *grp = getgrgid(g);
+
+        if (grp) {
+                char **mem;
+
+                for (mem = grp->gr_mem; *mem; mem++) {
+                        struct passwd *pwd = getpwnam(*mem);
+
+                        if (pwd && (pwd->pw_uid == u))
+                                return 1;
+                }
+        }
+        return 0;
+}
+
+/* This should probably be a libbb routine.  In that case,
+ * I'd probably rename it to something like bb_trimmed_slice.
+ */
+static char *get_trimmed_slice(char *s, char *e)
+{
+        /* First, consider the value at e to be nul and back up until we
+         * reach a non-space char.  Set the char after that (possibly at
+         * the original e) to nul. */
+        while (e-- > s) {
+                if (!isspace(*e)) {
+                        break;
+                }
+        }
+        e[1] = 0;
+
+        /* Next, advance past all leading space and return a ptr to the
+         * first non-space char; possibly the terminating nul. */
+        return skip_whitespace(s);
+}
+
+
+#define parse_error(x)  { err=x; goto pe_label; }
+
+/* Don't depend on the tools to combine strings. */
+static const char config_file[] = CONFIG_FILE;
+
+/* There are 4 chars + 1 nul for each of user/group/other. */
+static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-";
+
+/* We don't supply a value for the nul, so an index adjustment is
+ * necessary below.  Also, we use unsigned short here to save some
+ * space even though these are really mode_t values. */
+static const unsigned short mode_mask[] = {
+        /*  SST         sst                 xxx   --- */
+        S_ISUID,    S_ISUID|S_IXUSR,    S_IXUSR,    0,  /* user */
+        S_ISGID,    S_ISGID|S_IXGRP,    S_IXGRP,    0,  /* group */
+        0,          S_IXOTH,            S_IXOTH,    0   /* other */
+};
+
+static void parse_config_file(void)
+{
+        struct BB_suid_config *sct_head;
+        struct BB_suid_config *sct;
+        struct BB_applet *applet;
+        FILE *f;
+        char *err;
+        char *s;
+        char *e;
+        int i, lc, section;
+        char buffer[256];
+        struct stat st;
+
+        assert(!suid_config);           /* Should be set to NULL by bss init. */
+
+        if ((stat(config_file, &st) != 0)                       /* No config file? */
+                || !S_ISREG(st.st_mode)                                 /* Not a regular file? */
+                || (st.st_uid != 0)                                             /* Not owned by root? */
+                || (st.st_mode & (S_IWGRP | S_IWOTH))   /* Writable by non-root? */
+                || !(f = fopen(config_file, "r"))               /* Cannot open? */
+                ) {
+                return;
+        }
+
+        suid_cfg_readable = 1;
+        sct_head = NULL;
+        section = lc = 0;
+
+        do {
+                s = buffer;
+
+                if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
+                        if (ferror(f)) {   /* Make sure it wasn't a read error. */
+                                parse_error("reading");
+                        }
+                        fclose(f);
+                        suid_config = sct_head; /* Success, so set the pointer. */
+                        return;
+                }
+
+                lc++;                                   /* Got a (partial) line. */
+
+                /* If a line is too long for our buffer, we consider it an error.
+                 * The following test does mistreat one corner case though.
+                 * If the final line of the file does not end with a newline and
+                 * yet exactly fills the buffer, it will be treated as too long
+                 * even though there isn't really a problem.  But it isn't really
+                 * worth adding code to deal with such an unlikely situation, and
+                 * we do err on the side of caution.  Besides, the line would be
+                 * too long if it did end with a newline. */
+                if (!strchr(s, '\n') && !feof(f)) {
+                        parse_error("line too long");
+                }
+
+                /* Trim leading and trailing whitespace, ignoring comments, and
+                 * check if the resulting string is empty. */
+                if (!*(s = get_trimmed_slice(s, strchrnul(s, '#')))) {
+                        continue;
+                }
+
+                /* Check for a section header. */
+
+                if (*s == '[') {
+                        /* Unlike the old code, we ignore leading and trailing
+                         * whitespace for the section name.  We also require that
+                         * there are no stray characters after the closing bracket. */
+                        if (!(e = strchr(s, ']'))       /* Missing right bracket? */
+                                || e[1]                                 /* Trailing characters? */
+                                || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
+                                ) {
+                                parse_error("section header");
+                        }
+                        /* Right now we only have one section so just check it.
+                         * If more sections are added in the future, please don't
+                         * resort to cascading ifs with multiple strcasecmp calls.
+                         * That kind of bloated code is all too common.  A loop
+                         * and a string table would be a better choice unless the
+                         * number of sections is very small. */
+                        if (strcasecmp(s, "SUID") == 0) {
+                                section = 1;
+                                continue;
+                        }
+                        section = -1;   /* Unknown section so set to skip. */
+                        continue;
+                }
+
+                /* Process sections. */
+
+                if (section == 1) {             /* SUID */
+                        /* Since we trimmed leading and trailing space above, we're
+                         * now looking for strings of the form
+                         *    <key>[::space::]*=[::space::]*<value>
+                         * where both key and value could contain inner whitespace. */
+
+                        /* First get the key (an applet name in our case). */
+                        if (!!(e = strchr(s, '='))) {
+                                s = get_trimmed_slice(s, e);
+                        }
+                        if (!e || !*s) {        /* Missing '=' or empty key. */
+                                parse_error("keyword");
+                        }
+
+                        /* Ok, we have an applet name.  Process the rhs if this
+                         * applet is currently built in and ignore it otherwise.
+                         * Note: This can hide config file bugs which only pop
+                         * up when the busybox configuration is changed. */
+                        if ((applet = find_applet_by_name(s))) {
+                                /* Note: We currently don't check for duplicates!
+                                 * The last config line for each applet will be the
+                                 * one used since we insert at the head of the list.
+                                 * I suppose this could be considered a feature. */
+                                sct = xmalloc(sizeof(struct BB_suid_config));
+                                sct->m_applet = applet;
+                                sct->m_mode = 0;
+                                sct->m_next = sct_head;
+                                sct_head = sct;
+
+                                /* Get the specified mode. */
+
+                                e = skip_whitespace(e+1);
+
+                                for (i=0 ; i < 3 ; i++) {
+                                        const char *q;
+                                        if (!*(q = strchrnul(mode_chars + 5*i, *e++))) {
+                                                parse_error("mode");
+                                        }
+                                        /* Adjust by -i to account for nul. */
+                                        sct->m_mode |= mode_mask[(q - mode_chars) - i];
+                                }
+
+                                /* Now get the the user/group info. */
+
+                                s = skip_whitespace(e);
+
+                                /* Note: We require whitespace between the mode and the
+                                 * user/group info. */
+                                if ((s == e) || !(e = strchr(s, '.'))) {
+                                        parse_error("<uid>.<gid>");
+                                }
+                                *e++ = 0;
+
+                                /* We can't use get_ug_id here since it would exit()
+                                 * if a uid or gid was not found.  Oh well... */
+                                {
+                                        char *e2;
+
+                                        sct->m_uid = strtoul(s, &e2, 10);
+                                        if (*e2 || (s == e2)) {
+                                                struct passwd *pwd = getpwnam(s);
+                                                if (!pwd) {
+                                                        parse_error("user");
+                                                }
+                                                sct->m_uid = pwd->pw_uid;
+                                        }
+
+                                        sct->m_gid = strtoul(e, &e2, 10);
+                                        if (*e2 || (e == e2)) {
+                                                struct group *grp;
+                                                if (!(grp = getgrnam(e))) {
+                                                        parse_error("group");
+                                                }
+                                                sct->m_gid = grp->gr_gid;
+                                        }
+                                }
+                        }
+                        continue;
+                }
+
+                /* Unknown sections are ignored. */
+
+                /* Encountering configuration lines prior to seeing a
+                 * section header is treated as an error.  This is how
+                 * the old code worked, but it may not be desirable.
+                 * We may want to simply ignore such lines in case they
+                 * are used in some future version of busybox. */
+                if (!section) {
+                        parse_error("keyword outside section");
+                }
+
+        } while (1);
+
+ pe_label:
+        fprintf(stderr, "Parse error in %s, line %d: %s\n",
+                        config_file, lc, err);
+
+        fclose(f);
+        /* Release any allocated memory before returning. */
+        while (sct_head) {
+                sct = sct_head->m_next;
+                free(sct_head);
+                sct_head = sct;
+        }
+        return;
+}
+
+#else
+#define parse_config_file()
+#endif /* CONFIG_FEATURE_SUID_CONFIG */
+
+#ifdef CONFIG_FEATURE_SUID
+static void check_suid(struct BB_applet *applet)
+{
+        uid_t ruid = getuid();               /* real [ug]id */
+        uid_t rgid = getgid();
+
+#ifdef CONFIG_FEATURE_SUID_CONFIG
+        if (suid_cfg_readable) {
+                struct BB_suid_config *sct;
+
+                for (sct = suid_config; sct; sct = sct->m_next) {
+                        if (sct->m_applet == applet)
+                                break;
+                }
+                if (sct) {
+                        mode_t m = sct->m_mode;
+
+                        if (sct->m_uid == ruid)       /* same uid */
+                                m >>= 6;
+                        else if ((sct->m_gid == rgid) || ingroup(ruid, sct->m_gid))  /* same group / in group */
+                                m >>= 3;
+
+                        if (!(m & S_IXOTH))           /* is x bit not set ? */
+                                bb_error_msg_and_die("you have no permission to run this applet!");
+
+                        if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {     /* *both* have to be set for sgid */
+                                xsetgid(sct->m_gid);
+                        } else xsetgid(rgid);                /* no sgid -> drop */
+
+                        if (sct->m_mode & S_ISUID) xsetuid(sct->m_uid);
+                        else xsetuid(ruid);                  /* no suid -> drop */
+                } else {
+                        /* default: drop all privileges */
+                        xsetgid(rgid);
+                        xsetuid(ruid);
+                }
+                return;
+        } else {
+#ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
+                static int onetime = 0;
+
+                if (!onetime) {
+                        onetime = 1;
+                        fprintf(stderr, "Using fallback suid method\n");
+                }
+#endif
+        }
+#endif
+
+        if (applet->need_suid == _BB_SUID_ALWAYS) {
+                if (geteuid()) bb_error_msg_and_die("applet requires root privileges!");
+        } else if (applet->need_suid == _BB_SUID_NEVER) {
+                xsetgid(rgid);                          /* drop all privileges */
+                xsetuid(ruid);
+        }
+}
+#else
+#define check_suid(x)
+#endif /* CONFIG_FEATURE_SUID */
+
+
+
+#ifdef CONFIG_FEATURE_COMPRESS_USAGE
+
+#include "usage_compressed.h"
+#include "unarchive.h"
+
+static const char *unpack_usage_messages(void)
+{
+        int input[2], output[2], pid;
+        char *buf;
+
+        if(pipe(input) < 0 || pipe(output) < 0)
+                exit(1);
+
+        pid = fork();
+        switch (pid) {
+        case -1: /* error */
+                exit(1);
+        case 0: /* child */
+                close(input[1]);
+                close(output[0]);
+                uncompressStream(input[0], output[1]);
+                exit(0);
+        }
+        /* parent */
+
+        close(input[0]);
+        close(output[1]);
+        pid = fork();
+        switch (pid) {
+        case -1: /* error */
+                exit(1);
+        case 0: /* child */
+                full_write(input[1], packed_usage, sizeof(packed_usage));
+                exit(0);
+        }
+        /* parent */
+        close(input[1]);
+
+        buf = xmalloc(SIZEOF_usage_messages);
+        full_read(output[0], buf, SIZEOF_usage_messages);
+        return buf;
+}
+
+#else
+#define unpack_usage_messages() usage_messages
+#endif /* ENABLE_FEATURE_COMPRESS_USAGE */
+
+void bb_show_usage(void)
+{
+        if (ENABLE_SHOW_USAGE) {
+                const char *format_string;
+                const char *usage_string = unpack_usage_messages();
+                int i;
+
+                for (i = applet_using - applets; i > 0;)
+                        if (!*usage_string++) --i;
+
+                format_string = "%s\n\nUsage: %s %s\n\n";
+                if (*usage_string == '\b')
+                        format_string = "%s\n\nNo help available.\n\n";
+                fprintf(stderr, format_string, bb_msg_full_version,
+                        applet_using->name, usage_string);
+        }
+
+        exit(xfunc_error_retval);
+}
+
+static int applet_name_compare(const void *name, const void *vapplet)
+{
+        const struct BB_applet *applet = vapplet;
+
+        return strcmp(name, applet->name);
+}
+
+extern const size_t NUM_APPLETS;
+
+struct BB_applet *find_applet_by_name(const char *name)
+{
+        return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
+                                applet_name_compare);
+}
+
+void run_applet_by_name(const char *name, int argc, char **argv)
+{
+        if (ENABLE_FEATURE_SUID_CONFIG) parse_config_file();
+
+        if (!strncmp(name, "busybox", 7)) busybox_main(argc, argv);
+        /* Do a binary search to find the applet entry given the name. */
+        applet_using = find_applet_by_name(name);
+        if (applet_using) {
+                applet_name = applet_using->name;
+                if(argc==2 && !strcmp(argv[1], "--help")) bb_show_usage();
+                if(ENABLE_FEATURE_SUID) check_suid(applet_using);
+                exit((*(applet_using->main))(argc, argv));
+        }
+}
diff --git a/applets/busybox.c b/applets/busybox.c
new file mode 100644
index 000000000..bb9eb3af7
--- /dev/null
+++ b/applets/busybox.c
@@ -0,0 +1,148 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * BusyBox' main applet dispatcher.
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+#include "busybox.h"
+
+const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
+
+#ifdef CONFIG_FEATURE_INSTALLER
+/*
+ * directory table
+ *              this should be consistent w/ the enum, busybox.h::Location,
+ *              or else...
+ */
+static const char usr_bin [] ="/usr/bin";
+static const char usr_sbin[] ="/usr/sbin";
+
+static const char* const install_dir[] = {
+        &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
+        &usr_bin [4], /* "/bin" */
+        &usr_sbin[4], /* "/sbin" */
+        usr_bin,
+        usr_sbin
+};
+
+/* abstract link() */
+typedef int (*__link_f)(const char *, const char *);
+
+/* create (sym)links for each applet */
+static void install_links(const char *busybox, int use_symbolic_links)
+{
+        __link_f Link = link;
+
+        char *fpc;
+        int i;
+        int rc;
+
+        if (use_symbolic_links)
+                Link = symlink;
+
+        for (i = 0; applets[i].name != NULL; i++) {
+                fpc = concat_path_file(
+                        install_dir[applets[i].location], applets[i].name);
+                rc = Link(busybox, fpc);
+                if (rc!=0 && errno!=EEXIST) {
+                        bb_perror_msg("%s", fpc);
+                }
+                free(fpc);
+        }
+}
+
+#else
+#define install_links(x,y)
+#endif /* CONFIG_FEATURE_INSTALLER */
+
+int main(int argc, char **argv)
+{
+        const char *s;
+
+        applet_name=argv[0];
+        if (*applet_name == '-') applet_name++;
+        for (s = applet_name; *s ;)
+                if (*(s++) == '/') applet_name = s;
+
+        /* Set locale for everybody except 'init' */
+        if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
+                setlocale(LC_ALL, "");
+
+        run_applet_by_name(applet_name, argc, argv);
+        bb_error_msg_and_die("applet not found");
+}
+
+int busybox_main(int argc, char **argv)
+{
+        /*
+         * This style of argument parsing doesn't scale well
+         * in the event that busybox starts wanting more --options.
+         * If someone has a cleaner approach, by all means implement it.
+         */
+        if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
+                int use_symbolic_links = 0;
+                int rc = 0;
+                char *busybox;
+
+                /* to use symlinks, or not to use symlinks... */
+                if (argc > 2) {
+                        if ((strcmp(argv[2], "-s") == 0)) {
+                                use_symbolic_links = 1;
+                        }
+                }
+
+                /* link */
+// XXX: FIXME: this is broken. Why not just use argv[0] ?
+                busybox = xreadlink("/proc/self/exe");
+                if (busybox) {
+                        install_links(busybox, use_symbolic_links);
+                        free(busybox);
+                } else {
+                        rc = 1;
+                }
+                return rc;
+        }
+
+        /* Deal with --help.  (Also print help when called with no arguments) */
+
+        if (argc==1 || !strcmp(argv[1],"--help") ) {
+                if (argc>2) {
+                        applet_name = argv[2];
+                        run_applet_by_name(applet_name, 2, argv);
+                } else {
+                        const struct BB_applet *a;
+                        int col, output_width;
+
+                        if (ENABLE_FEATURE_AUTOWIDTH) {
+                                /* Obtain the terminal width.  */
+                                get_terminal_width_height(0, &output_width, NULL);
+                                /* leading tab and room to wrap */
+                                output_width -= sizeof("start-stop-daemon, ") + 8;
+                        } else output_width = 80 - sizeof("start-stop-daemon, ") - 8;
+
+                        printf("%s\n"
+                               "Copyright (C) 1998-2006  Erik Andersen, Rob Landley, and others.\n"
+                               "Licensed under GPLv2.  See source distribution for full notice.\n\n"
+                               "Usage: busybox [function] [arguments]...\n"
+                               "   or: [function] [arguments]...\n\n"
+                               "\tBusyBox is a multi-call binary that combines many common Unix\n"
+                               "\tutilities into a single executable.  Most people will create a\n"
+                               "\tlink to busybox for each function they wish to use and BusyBox\n"
+                               "\twill act like whatever it was invoked as!\n"
+                               "\nCurrently defined functions:\n", bb_msg_full_version);
+
+                        col=0;
+                        for(a = applets; a->name;) {
+                                col += printf("%s%s", (col ? ", " : "\t"), (a++)->name);
+                                if (col > output_width && a->name) {
+                                        printf(",\n");
+                                        col = 0;
+                                }
+                        }
+                        printf("\n\n");
+                        exit(0);
+                }
+        } else run_applet_by_name(argv[1], argc-1, argv+1);
+
+        bb_error_msg_and_die("applet not found");
+}
diff --git a/applets/busybox.mkll b/applets/busybox.mkll
new file mode 100755
index 000000000..6d61f7e82
--- /dev/null
+++ b/applets/busybox.mkll
@@ -0,0 +1,24 @@
+#!/bin/sh
+# Make busybox links list file.
+
+# input $1: full path to Config.h
+# input $2: full path to applets.h
+# output (stdout): list of pathnames that should be linked to busybox
+
+# Maintainer: Larry Doolittle <ldoolitt@recycle.lbl.gov>
+
+export LC_ALL=POSIX
+export LC_CTYPE=POSIX
+
+CONFIG_H=${1:-include/autoconf.h}
+APPLETS_H=${2:-include/applets.h}
+$HOSTCC -E -DMAKE_LINKS -include $CONFIG_H $APPLETS_H |
+  awk '/^[ \t]*LINK/{
+        dir=substr($2,8)
+        gsub("_","/",dir)
+        if(dir=="/ROOT") dir=""
+        file=$3
+        gsub("\"","",file)
+        if (file=="busybox") next
+        print tolower(dir) "/" file
+  }'
diff --git a/applets/individual.c b/applets/individual.c
new file mode 100644
index 000000000..072168352
--- /dev/null
+++ b/applets/individual.c
@@ -0,0 +1,27 @@
+/* Minimal wrapper to build an individual busybox applet.
+ *
+ * Copyright 2005 Rob Landley <rob@landley.net
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details
+ */
+
+const char *applet_name;
+
+#include <stdio.h>
+#include <stdlib.h>
+//Ok to remove? #include "bb_config.h"
+#include "usage.h"
+
+int main(int argc, char *argv[])
+{
+        applet_name=argv[0];
+
+        return APPLET_main(argc,argv);
+}
+
+void bb_show_usage(void)
+{
+        printf(APPLET_full_usage "\n");
+
+        exit(1);
+}
diff --git a/applets/install.sh b/applets/install.sh
new file mode 100755
index 000000000..4ec96c254
--- /dev/null
+++ b/applets/install.sh
@@ -0,0 +1,94 @@
+#!/bin/sh
+
+export LC_ALL=POSIX
+export LC_CTYPE=POSIX
+
+prefix=${1}
+if [ -z "$prefix" ]; then
+        echo "usage: applets/install.sh DESTINATION [--symlinks/--hardlinks]"
+        exit 1;
+fi
+h=`sort busybox.links | uniq`
+cleanup="0"
+noclobber="0"
+case "$2" in
+        --hardlinks) linkopts="-f";;
+        --symlinks)  linkopts="-fs";;
+        --cleanup)   cleanup="1";;
+        --noclobber) noclobber="1";;
+        "")          h="";;
+        *)           echo "Unknown install option: $2"; exit 1;;
+esac
+
+if [ -n "$DO_INSTALL_LIBS" ] && [ "$DO_INSTALL_LIBS" != "n" ]; then
+        # get the target dir for the libs
+        # assume it starts with lib
+        libdir=$($CC -print-file-name=libc.so | \
+                 sed -n 's%^.*\(/lib[^\/]*\)/libc.so%\1%p')
+        if test -z "$libdir"; then
+                libdir=/lib
+        fi
+
+        mkdir -p $prefix/$libdir || exit 1
+        for i in $DO_INSTALL_LIBS; do
+                rm -f $prefix/$libdir/$i || exit 1
+                if [ -f $i ]; then
+                        cp -a $i $prefix/$libdir/ || exit 1
+                        chmod 0644 $prefix/$libdir/$i || exit 1
+                fi
+        done
+fi
+
+if [ "$cleanup" = "1" ] && [ -e "$prefix/bin/busybox" ]; then
+        inode=`ls -i "$prefix/bin/busybox" | awk '{print $1}'`
+        sub_shell_it=`
+        cd "$prefix"
+        for d in usr/sbin usr/bin sbin bin ; do
+                pd=$PWD
+                if [ -d "$d" ]; then
+                        cd $d
+                        ls -iL . | grep "^ *$inode" | awk '{print $2}' | env -i xargs rm -f
+                fi
+                cd "$pd"
+        done
+        `
+fi
+
+rm -f $prefix/bin/busybox || exit 1
+mkdir -p $prefix/bin || exit 1
+install -m 755 busybox $prefix/bin/busybox || exit 1
+
+for i in $h ; do
+        appdir=`dirname $i`
+        mkdir -p $prefix/$appdir || exit 1
+        if [ "$2" = "--hardlinks" ]; then
+                bb_path="$prefix/bin/busybox"
+        else
+                case "$appdir" in
+                /)
+                        bb_path="bin/busybox"
+                ;;
+                /bin)
+                        bb_path="busybox"
+                ;;
+                /sbin)
+                        bb_path="../bin/busybox"
+                ;;
+                /usr/bin|/usr/sbin)
+                        bb_path="../../bin/busybox"
+                ;;
+                *)
+                echo "Unknown installation directory: $appdir"
+                exit 1
+                ;;
+                esac
+        fi
+        if [ "$noclobber" = "0" ] || [ ! -e "$prefix$i" ]; then
+                echo "  $prefix$i -> $bb_path"
+                ln $linkopts $bb_path $prefix$i || exit 1
+        else
+                echo "  $prefix$i already exists"
+        fi
+done
+
+exit 0
diff --git a/applets/usage.c b/applets/usage.c
new file mode 100644
index 000000000..d888fa93d
--- /dev/null
+++ b/applets/usage.c
@@ -0,0 +1,17 @@
+/* vi: set sw=4 ts=4: */
+#include <unistd.h>
+
+#include "../include/autoconf.h"
+#include "../include/busybox.h"
+
+static const char usage_messages[] =
+#define MAKE_USAGE
+#include "usage.h"
+#include "applets.h"
+;
+
+int main(void)
+{
+        write(1, usage_messages, sizeof(usage_messages));
+        return 0;
+}
diff --git a/applets/usage_compressed b/applets/usage_compressed
new file mode 100755
index 000000000..ab164aa12
--- /dev/null
+++ b/applets/usage_compressed
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+target="$1"
+loc="$2"
+
+test "$target" || exit 1
+test "$loc" || loc=.
+test -x "$loc/usage" || exit 1
+test "$SED" || SED=sed
+
+sz=`"$loc/usage" | wc -c` || exit 1
+
+exec >"$target"
+
+echo 'static const char packed_usage[] = '
+"$loc/usage" | bzip2 -1 | od -v -t x1 \
+| $SED -e 's/^[^ ]*//' -e 's/ \(..\)/\\x\1/g' -e 's/^\(.*\)$/"\1"/'
+echo ';'
+echo '#define SIZEOF_usage_messages' `expr 0 + $sz`