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c44ab01b75
and now this fact is recorded in applets.h, not ash.c. Several fixes to "--help + STANDALONE_SHELL" scenarios. function old new delta run_current_applet_and_exit - 355 +355 arith 2064 2073 +9 refresh 1148 1156 +8 getopt32 1068 1073 +5 telnet_main 1510 1514 +4 md5_sha1_sum_main 565 566 +1 xstrtoul_range_sfx 255 251 -4 packed_usage 22523 22514 -9 tryexec 255 203 -52 static.safe_applets 152 - -152 .rodata 131320 131128 -192 run_applet_by_name 869 506 -363 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 5/5 up/down: 382/-772) Total: -390 bytes ./busybox ash -c 'i=20000; while test $i != 0; do touch z; i=$((i-1)); done' runs more than twice as fast with STANDALONE_SHELL versus without.
647 lines
17 KiB
C
647 lines
17 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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* Licensed under GPLv2 or later, see file License in this tarball for details.
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*/
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#include <assert.h>
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#include "busybox.h"
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/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
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#if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
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#warning Static linking against glibc produces buggy executables
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#warning (glibc does not cope well with ld --gc-sections).
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#warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
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#warning Note that glibc is unsuitable for static linking anyway.
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#warning If you still want to do it, remove -Wl,--gc-sections
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#warning from top-level Makefile and remove this warning.
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#endif
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/* Declare <applet>_main() */
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#define PROTOTYPES
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#include "applets.h"
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#undef PROTOTYPES
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#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
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/* Define usage_messages[] */
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static const char usage_messages[] =
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#define MAKE_USAGE
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#include "usage.h"
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#include "applets.h"
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;
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#undef MAKE_USAGE
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#else
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#define usage_messages 0
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#endif /* SHOW_USAGE */
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/* Define struct BB_applet applets[] */
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#include "applets.h"
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/* The -1 arises because of the {0,NULL,0,-1} entry. */
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const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(struct BB_applet) - 1;
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const struct BB_applet *current_applet;
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const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
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#ifdef BB_NOMMU
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smallint re_execed;
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#endif
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#if ENABLE_FEATURE_SUID_CONFIG
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/* applets[] is const, so we have to define this "override" structure */
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static struct BB_suid_config {
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const struct BB_applet *m_applet;
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uid_t m_uid;
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gid_t m_gid;
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mode_t m_mode;
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struct BB_suid_config *m_next;
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} *suid_config;
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static smallint suid_cfg_readable;
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/* check if u is member of group g */
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static int ingroup(uid_t u, gid_t g)
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{
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struct group *grp = getgrgid(g);
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if (grp) {
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char **mem;
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for (mem = grp->gr_mem; *mem; mem++) {
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struct passwd *pwd = getpwnam(*mem);
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if (pwd && (pwd->pw_uid == u))
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return 1;
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}
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}
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return 0;
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}
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/* This should probably be a libbb routine. In that case,
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* I'd probably rename it to something like bb_trimmed_slice.
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*/
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static char *get_trimmed_slice(char *s, char *e)
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{
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/* First, consider the value at e to be nul and back up until we
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* reach a non-space char. Set the char after that (possibly at
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* the original e) to nul. */
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while (e-- > s) {
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if (!isspace(*e)) {
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break;
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}
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}
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e[1] = '\0';
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/* Next, advance past all leading space and return a ptr to the
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* first non-space char; possibly the terminating nul. */
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return skip_whitespace(s);
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}
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/* Don't depend on the tools to combine strings. */
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static const char config_file[] = "/etc/busybox.conf";
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/* There are 4 chars + 1 nul for each of user/group/other. */
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static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-";
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/* We don't supply a value for the nul, so an index adjustment is
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* necessary below. Also, we use unsigned short here to save some
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* space even though these are really mode_t values. */
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static const unsigned short mode_mask[] = {
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/* SST sst xxx --- */
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S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */
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S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */
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0, S_IXOTH, S_IXOTH, 0 /* other */
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};
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#define parse_error(x) do { errmsg = x; goto pe_label; } while(0)
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static void parse_config_file(void)
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{
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struct BB_suid_config *sct_head;
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struct BB_suid_config *sct;
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const struct BB_applet *applet;
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FILE *f;
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const char *errmsg;
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char *s;
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char *e;
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int i, lc, section;
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char buffer[256];
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struct stat st;
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assert(!suid_config); /* Should be set to NULL by bss init. */
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if ((stat(config_file, &st) != 0) /* No config file? */
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|| !S_ISREG(st.st_mode) /* Not a regular file? */
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|| (st.st_uid != 0) /* Not owned by root? */
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|| (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
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|| !(f = fopen(config_file, "r")) /* Cannot open? */
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) {
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return;
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}
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suid_cfg_readable = 1;
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sct_head = NULL;
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section = lc = 0;
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while (1) {
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s = buffer;
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if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
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if (ferror(f)) { /* Make sure it wasn't a read error. */
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parse_error("reading");
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}
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fclose(f);
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suid_config = sct_head; /* Success, so set the pointer. */
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return;
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}
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lc++; /* Got a (partial) line. */
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/* If a line is too long for our buffer, we consider it an error.
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* The following test does mistreat one corner case though.
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* If the final line of the file does not end with a newline and
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* yet exactly fills the buffer, it will be treated as too long
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* even though there isn't really a problem. But it isn't really
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* worth adding code to deal with such an unlikely situation, and
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* we do err on the side of caution. Besides, the line would be
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* too long if it did end with a newline. */
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if (!strchr(s, '\n') && !feof(f)) {
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parse_error("line too long");
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}
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/* Trim leading and trailing whitespace, ignoring comments, and
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* check if the resulting string is empty. */
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s = get_trimmed_slice(s, strchrnul(s, '#'));
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if (!*s) {
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continue;
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}
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/* Check for a section header. */
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if (*s == '[') {
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/* Unlike the old code, we ignore leading and trailing
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* whitespace for the section name. We also require that
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* there are no stray characters after the closing bracket. */
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e = strchr(s, ']');
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if (!e /* Missing right bracket? */
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|| e[1] /* Trailing characters? */
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|| !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
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) {
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parse_error("section header");
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}
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/* Right now we only have one section so just check it.
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* If more sections are added in the future, please don't
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* resort to cascading ifs with multiple strcasecmp calls.
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* That kind of bloated code is all too common. A loop
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* and a string table would be a better choice unless the
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* number of sections is very small. */
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if (strcasecmp(s, "SUID") == 0) {
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section = 1;
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continue;
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}
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section = -1; /* Unknown section so set to skip. */
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continue;
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}
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/* Process sections. */
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if (section == 1) { /* SUID */
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/* Since we trimmed leading and trailing space above, we're
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* now looking for strings of the form
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* <key>[::space::]*=[::space::]*<value>
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* where both key and value could contain inner whitespace. */
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/* First get the key (an applet name in our case). */
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e = strchr(s, '=');
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if (e) {
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s = get_trimmed_slice(s, e);
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}
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if (!e || !*s) { /* Missing '=' or empty key. */
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parse_error("keyword");
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}
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/* Ok, we have an applet name. Process the rhs if this
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* applet is currently built in and ignore it otherwise.
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* Note: this can hide config file bugs which only pop
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* up when the busybox configuration is changed. */
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applet = find_applet_by_name(s);
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if (applet) {
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/* Note: We currently don't check for duplicates!
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* The last config line for each applet will be the
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* one used since we insert at the head of the list.
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* I suppose this could be considered a feature. */
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sct = xmalloc(sizeof(struct BB_suid_config));
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sct->m_applet = applet;
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sct->m_mode = 0;
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sct->m_next = sct_head;
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sct_head = sct;
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/* Get the specified mode. */
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e = skip_whitespace(e+1);
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for (i = 0; i < 3; i++) {
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const char *q;
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q = strchrnul(mode_chars + 5*i, *e++);
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if (!*q) {
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parse_error("mode");
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}
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/* Adjust by -i to account for nul. */
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sct->m_mode |= mode_mask[(q - mode_chars) - i];
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}
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/* Now get the the user/group info. */
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s = skip_whitespace(e);
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/* Note: we require whitespace between the mode and the
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* user/group info. */
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if ((s == e) || !(e = strchr(s, '.'))) {
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parse_error("<uid>.<gid>");
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}
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*e++ = '\0';
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/* We can't use get_ug_id here since it would exit()
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* if a uid or gid was not found. Oh well... */
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sct->m_uid = bb_strtoul(s, NULL, 10);
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if (errno) {
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struct passwd *pwd = getpwnam(s);
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if (!pwd) {
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parse_error("user");
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}
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sct->m_uid = pwd->pw_uid;
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}
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sct->m_gid = bb_strtoul(e, NULL, 10);
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if (errno) {
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struct group *grp;
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grp = getgrnam(e);
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if (!grp) {
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parse_error("group");
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}
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sct->m_gid = grp->gr_gid;
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}
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}
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continue;
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}
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/* Unknown sections are ignored. */
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/* Encountering configuration lines prior to seeing a
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* section header is treated as an error. This is how
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* the old code worked, but it may not be desirable.
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* We may want to simply ignore such lines in case they
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* are used in some future version of busybox. */
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if (!section) {
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parse_error("keyword outside section");
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}
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} /* while (1) */
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pe_label:
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fprintf(stderr, "Parse error in %s, line %d: %s\n",
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config_file, lc, errmsg);
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fclose(f);
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/* Release any allocated memory before returning. */
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while (sct_head) {
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sct = sct_head->m_next;
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free(sct_head);
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sct_head = sct;
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}
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}
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#else
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#define parse_config_file() ((void)0)
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#endif /* FEATURE_SUID_CONFIG */
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#if ENABLE_FEATURE_SUID
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static void check_suid(const struct BB_applet *applet)
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{
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uid_t ruid = getuid(); /* real [ug]id */
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uid_t rgid = getgid();
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#if ENABLE_FEATURE_SUID_CONFIG
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if (suid_cfg_readable) {
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struct BB_suid_config *sct;
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mode_t m;
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for (sct = suid_config; sct; sct = sct->m_next) {
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if (sct->m_applet == applet)
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goto found;
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}
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/* default: drop all privileges */
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xsetgid(rgid);
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xsetuid(ruid);
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return;
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found:
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m = sct->m_mode;
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if (sct->m_uid == ruid)
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/* same uid */
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m >>= 6;
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else if ((sct->m_gid == rgid) || ingroup(ruid, sct->m_gid))
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/* same group / in group */
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m >>= 3;
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if (!(m & S_IXOTH)) /* is x bit not set ? */
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bb_error_msg_and_die("you have no permission to run this applet!");
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if (sct->m_gid != 0) {
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/* _both_ have to be set for sgid */
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if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
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xsetgid(sct->m_gid);
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} else xsetgid(rgid); /* no sgid -> drop */
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}
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if (sct->m_uid != 0) {
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if (sct->m_mode & S_ISUID) xsetuid(sct->m_uid);
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else xsetuid(ruid); /* no suid -> drop */
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}
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return;
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}
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#if !ENABLE_FEATURE_SUID_CONFIG_QUIET
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{
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static smallint onetime = 0;
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if (!onetime) {
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onetime = 1;
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fprintf(stderr, "Using fallback suid method\n");
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}
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}
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#endif
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#endif
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if (applet->need_suid == _BB_SUID_ALWAYS) {
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if (geteuid())
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bb_error_msg_and_die("applet requires root privileges!");
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} else if (applet->need_suid == _BB_SUID_NEVER) {
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xsetgid(rgid); /* drop all privileges */
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xsetuid(ruid);
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}
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}
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#else
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#define check_suid(x) ((void)0)
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#endif /* FEATURE_SUID */
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#if ENABLE_FEATURE_COMPRESS_USAGE
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#include "usage_compressed.h"
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#include "unarchive.h"
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static const char *unpack_usage_messages(void)
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{
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int input[2], output[2], pid;
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char *buf;
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if (pipe(input) < 0 || pipe(output) < 0)
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exit(1);
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//TODO: not NOMMU friendly!
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pid = fork();
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switch (pid) {
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case -1: /* error */
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exit(1);
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case 0: /* child */
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close(input[1]);
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close(output[0]);
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uncompressStream(input[0], output[1]);
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exit(0);
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}
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/* parent */
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close(input[0]);
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close(output[1]);
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pid = fork();
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switch (pid) {
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case -1: /* error */
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exit(1);
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case 0: /* child */
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full_write(input[1], packed_usage, sizeof(packed_usage));
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exit(0);
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}
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/* parent */
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close(input[1]);
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buf = xmalloc(SIZEOF_usage_messages);
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full_read(output[0], buf, SIZEOF_usage_messages);
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return buf;
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}
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#else
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#define unpack_usage_messages() usage_messages
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#endif /* FEATURE_COMPRESS_USAGE */
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void bb_show_usage(void)
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{
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if (ENABLE_SHOW_USAGE) {
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const char *format_string;
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const char *usage_string = unpack_usage_messages();
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int i;
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i = current_applet - applets;
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while (i) {
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while (*usage_string++) continue;
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i--;
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}
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format_string = "%s\n\nUsage: %s %s\n\n";
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if (*usage_string == '\b')
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format_string = "%s\n\nNo help available.\n\n";
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fprintf(stderr, format_string, bb_msg_full_version,
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applet_name, usage_string);
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}
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exit(xfunc_error_retval);
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}
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static int applet_name_compare(const void *name, const void *vapplet)
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{
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const struct BB_applet *applet = vapplet;
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return strcmp(name, applet->name);
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}
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const struct BB_applet *find_applet_by_name(const char *name)
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{
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/* Do a binary search to find the applet entry given the name. */
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return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
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applet_name_compare);
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}
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#if ENABLE_FEATURE_INSTALLER
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/*
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* directory table
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* this should be consistent w/ the enum, busybox.h::Location,
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* or else...
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*/
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static const char usr_bin [] = "/usr/bin";
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static const char usr_sbin[] = "/usr/sbin";
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static const char *const install_dir[] = {
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&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
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&usr_bin [4], /* "/bin" */
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&usr_sbin[4], /* "/sbin" */
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usr_bin,
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usr_sbin
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};
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/* create (sym)links for each applet */
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static void install_links(const char *busybox, int use_symbolic_links)
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{
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int (*lf)(const char *, const char *) = link;
|
||
char *fpc;
|
||
int i;
|
||
int rc;
|
||
|
||
if (use_symbolic_links)
|
||
lf = symlink;
|
||
|
||
for (i = 0; applets[i].name != NULL; i++) {
|
||
fpc = concat_path_file(
|
||
install_dir[applets[i].location],
|
||
applets[i].name);
|
||
rc = lf(busybox, fpc);
|
||
if (rc != 0 && errno != EEXIST) {
|
||
bb_perror_msg("%s", fpc);
|
||
}
|
||
free(fpc);
|
||
}
|
||
}
|
||
#else
|
||
#define install_links(x,y) ((void)0)
|
||
#endif /* FEATURE_INSTALLER */
|
||
|
||
|
||
/* If we were called as "busybox..." */
|
||
static int busybox_main(int argc, char **argv)
|
||
{
|
||
if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
|
||
int use_symbolic_links = 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 */
|
||
busybox = xmalloc_readlink_or_warn("/proc/self/exe");
|
||
if (!busybox)
|
||
return 1;
|
||
install_links(busybox, use_symbolic_links);
|
||
if (ENABLE_FEATURE_CLEAN_UP)
|
||
free(busybox);
|
||
return 0;
|
||
}
|
||
|
||
/* Deal with --help. Also print help when called with no arguments */
|
||
|
||
if (argc == 1 || !strcmp(argv[1], "--help") ) {
|
||
if (argc > 2) {
|
||
/* set name for proper "<name>: applet not found" */
|
||
applet_name = argv[2];
|
||
run_applet_by_name(applet_name, 2, argv);
|
||
} else {
|
||
const struct BB_applet *a;
|
||
int col, output_width;
|
||
|
||
output_width = 80 - sizeof("start-stop-daemon, ") - 8;
|
||
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;
|
||
}
|
||
|
||
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;
|
||
a = applets;
|
||
while (a->name) {
|
||
col += printf("%s%s", (col ? ", " : "\t"), a->name);
|
||
a++;
|
||
if (col > output_width && a->name) {
|
||
puts(",");
|
||
col = 0;
|
||
}
|
||
}
|
||
puts("\n");
|
||
return 0;
|
||
}
|
||
} else run_applet_by_name(argv[1], argc - 1, argv + 1);
|
||
|
||
bb_error_msg_and_die("applet not found");
|
||
}
|
||
|
||
void run_current_applet_and_exit(int argc, char **argv)
|
||
{
|
||
applet_name = current_applet->name;
|
||
if (argc == 2 && !strcmp(argv[1], "--help"))
|
||
bb_show_usage();
|
||
if (ENABLE_FEATURE_SUID)
|
||
check_suid(current_applet);
|
||
exit(current_applet->main(argc, argv));
|
||
}
|
||
|
||
void run_applet_by_name(const char *name, int argc, char **argv)
|
||
{
|
||
current_applet = find_applet_by_name(name);
|
||
if (current_applet)
|
||
run_current_applet_and_exit(argc, argv);
|
||
if (!strncmp(name, "busybox", 7))
|
||
exit(busybox_main(argc, argv));
|
||
}
|
||
|
||
|
||
int main(int argc, char **argv)
|
||
{
|
||
const char *s;
|
||
|
||
applet_name = argv[0];
|
||
#ifdef BB_NOMMU
|
||
/* NOMMU re-exec trick sets high-order bit in first byte of name */
|
||
if (applet_name[0] & 0x80) {
|
||
re_execed = 1;
|
||
applet_name[0] &= 0x7f;
|
||
}
|
||
#endif
|
||
if (applet_name[0] == '-')
|
||
applet_name++;
|
||
s = strrchr(applet_name, '/');
|
||
if (s)
|
||
applet_name = s + 1;
|
||
|
||
if (ENABLE_FEATURE_SUID_CONFIG)
|
||
parse_config_file();
|
||
|
||
/* 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");
|
||
}
|