* isn't something I'm going to worry about... If you wrote something
* here, please feel free to acknowledge your work.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
+ * 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 <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <assert.h>
#include "busybox.h"
-#undef APPLET
-#undef APPLET_NOUSAGE
-#undef PROTOTYPES
-#include "applets.h"
-
-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);
+/* 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 unsuitable for static linking anyway.
+#warning If you still want to do it, remove -Wl,--gc-sections
+#warning from top-level Makefile and remove this warning.
+#endif
-#ifdef CONFIG_FEATURE_SUID
+/* Declare <applet>_main() */
+#define PROTOTYPES
+#include "applets.h"
+#undef PROTOTYPES
-static void check_suid ( struct BB_applet *app );
+#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
+/* Define usage_messages[] */
+static const char usage_messages[] = ""
+#define MAKE_USAGE
+#include "usage.h"
+#include "applets.h"
+;
+#undef MAKE_USAGE
+#else
+#define usage_messages 0
+#endif /* SHOW_USAGE */
-#ifdef CONFIG_FEATURE_SUID_CONFIG
+/* Define struct bb_applet applets[] */
+#include "applets.h"
+/* The -1 arises because of the {0,NULL,0,-1} entry. */
+const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(applets[0]) - 1;
-#include <sys/stat.h>
-#include <ctype.h>
-#include "pwd_.h"
-#include "grp_.h"
-static int parse_config_file ( void );
+const struct bb_applet *current_applet;
+const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
+#if !BB_MMU
+bool re_execed;
+#endif
-static int config_ok;
-#define CONFIG_FILE "/etc/busybox.conf"
-// applets [] is const, so we have to define this "override" structure
-struct BB_suid_config {
- struct BB_applet *m_applet;
+#if ENABLE_FEATURE_SUID_CONFIG
- uid_t m_uid;
- gid_t m_gid;
+/* applets[] is const, so we have to define this "override" structure */
+static struct BB_suid_config {
+ const struct bb_applet *m_applet;
+ uid_t m_uid;
+ gid_t m_gid;
mode_t m_mode;
-
struct BB_suid_config *m_next;
-};
-
-static struct BB_suid_config *suid_config;
+} *suid_config;
-#endif // CONFIG_FEATURE_SUID_CONFIG
-
-#endif // CONFIG_FEATURE_SUID
+static bool 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;
-extern void show_usage(void)
-{
- const char *format_string;
- const char *usage_string = usage_messages;
- int i;
+ for (mem = grp->gr_mem; *mem; mem++) {
+ struct passwd *pwd = getpwnam(*mem);
- for (i = applet_using - applets; i > 0; ) {
- if (!*usage_string++) {
- --i;
+ if (pwd && (pwd->pw_uid == u))
+ return 1;
}
}
- format_string = "%s\n\nUsage: %s %s\n\n";
- if(*usage_string == 0)
- format_string = "%s\n\nNo help available.\n\n";
- fprintf(stderr, format_string,
- full_version, applet_using->name, usage_string);
- exit(EXIT_FAILURE);
+ return 0;
}
-static int applet_name_compare(const void *x, const void *y)
+/* 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)
{
- const char *name = x;
- const struct BB_applet *applet = y;
+ /* 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';
- return strcmp(name, applet->name);
+ /* Next, advance past all leading space and return a ptr to the
+ * first non-space char; possibly the terminating nul. */
+ return skip_whitespace(s);
}
-extern const size_t NUM_APPLETS;
+/* Don't depend on the tools to combine strings. */
+static const char config_file[] = "/etc/busybox.conf";
-struct BB_applet *find_applet_by_name(const char *name)
-{
- return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
- applet_name_compare);
-}
+/* 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 */
+};
+
+#define parse_error(x) do { errmsg = x; goto pe_label; } while (0)
-void run_applet_by_name(const char *name, int argc, char **argv)
+static void parse_config_file(void)
{
- static int recurse_level = 0;
- extern int been_there_done_that; /* From busybox.c */
+ struct BB_suid_config *sct_head;
+ struct BB_suid_config *sct;
+ const struct bb_applet *applet;
+ FILE *f;
+ const char *errmsg;
+ char *s;
+ char *e;
+ int i;
+ unsigned lc;
+ smallint section;
+ char buffer[256];
+ struct stat st;
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if ( recurse_level == 0 )
- config_ok = parse_config_file ( );
-#endif
+ assert(!suid_config); /* Should be set to NULL by bss init. */
- recurse_level++;
- /* Do a binary search to find the applet entry given the name. */
- if ((applet_using = find_applet_by_name(name)) != NULL) {
- applet_name = applet_using->name;
- if (argv[1] && strcmp(argv[1], "--help") == 0) {
- if (strcmp(applet_using->name, "busybox")==0) {
- if(argv[2])
- applet_using = find_applet_by_name(argv[2]);
- else
- applet_using = NULL;
+ 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;
+
+ while (1) {
+ 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");
}
- if(applet_using)
- show_usage();
- been_there_done_that=1;
- busybox_main(0, NULL);
+ fclose(f);
+ suid_config = sct_head; /* Success, so set the pointer. */
+ return;
}
-#ifdef CONFIG_FEATURE_SUID
- check_suid ( applet_using );
-#endif
-
- exit((*(applet_using->main)) (argc, argv));
- }
- /* Just in case they have renamed busybox - Check argv[1] */
- if (recurse_level == 1) {
- run_applet_by_name("busybox", argc, argv);
- }
- recurse_level--;
-}
+ 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");
+ }
-#ifdef CONFIG_FEATURE_SUID
+ /* Trim leading and trailing whitespace, ignoring comments, and
+ * check if the resulting string is empty. */
+ s = get_trimmed_slice(s, strchrnul(s, '#'));
+ if (!*s) {
+ continue;
+ }
-#ifdef CONFIG_FEATURE_SUID_CONFIG
+ /* 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. */
+ e = strchr(s, ']');
+ if (!e /* 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;
+ }
-// 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;
+ /* 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). */
+ e = strchr(s, '=');
+ if (e) {
+ 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. */
+ applet = find_applet_by_name(s);
+ if (applet) {
+ /* 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;
+ q = strchrnul(mode_chars + 5*i, *e++);
+ if (!*q) {
+ 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... */
+ sct->m_uid = bb_strtoul(s, NULL, 10);
+ if (errno) {
+ struct passwd *pwd = getpwnam(s);
+ if (!pwd) {
+ parse_error("user");
+ }
+ sct->m_uid = pwd->pw_uid;
+ }
+
+ sct->m_gid = bb_strtoul(e, NULL, 10);
+ if (errno) {
+ struct group *grp;
+ grp = getgrnam(e);
+ if (!grp) {
+ 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, errmsg);
+
+ fclose(f);
+ /* Release any allocated memory before returning. */
+ while (sct_head) {
+ sct = sct_head->m_next;
+ free(sct_head);
+ sct_head = sct;
}
- return 0;
}
+#else
+#define parse_config_file() ((void)0)
+#endif /* FEATURE_SUID_CONFIG */
-#endif
-
-void check_suid ( struct BB_applet *applet )
+#if ENABLE_FEATURE_SUID
+static void check_suid(const struct bb_applet *applet)
{
- uid_t ruid = getuid ( ); // real [ug]id
- uid_t rgid = getgid ( );
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if ( config_ok ) {
+ uid_t ruid = getuid(); /* real [ug]id */
+ uid_t rgid = getgid();
+
+#if ENABLE_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 ?
- 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
- if ( setegid ( sct-> m_gid ))
- error_msg_and_die ( "BusyBox binary has insufficient rights to set proper GID for applet!" );
- }
- else
- setgid ( rgid ); // no sgid -> drop
-
- if ( sct-> m_mode & S_ISUID ) {
- if ( seteuid ( sct-> m_uid ))
- error_msg_and_die ( "BusyBox binary has insufficient rights to set proper UID for applet!" );
- }
- else
- setuid ( ruid ); // no suid -> drop
+ mode_t m;
+
+ for (sct = suid_config; sct; sct = sct->m_next) {
+ if (sct->m_applet == applet)
+ goto found;
+ }
+ /* default: drop all privileges */
+ xsetgid(rgid);
+ xsetuid(ruid);
+ return;
+ found:
+ 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_gid != 0) {
+ /* _both_ have to be set for sgid */
+ if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
+ xsetgid(sct->m_gid);
+ } else xsetgid(rgid); /* no sgid -> drop */
}
- else { // default: drop all priviledges
- setgid ( rgid );
- setuid ( ruid );
+ if (sct->m_uid != 0) {
+ if (sct->m_mode & S_ISUID) xsetuid(sct->m_uid);
+ else xsetuid(ruid); /* no suid -> drop */
}
return;
}
- else {
- static int onetime = 0;
-
- if ( !onetime ) {
+#if !ENABLE_FEATURE_SUID_CONFIG_QUIET
+ {
+ static bool onetime = 0;
+
+ if (!onetime) {
onetime = 1;
- fprintf ( stderr, "Using fallback suid method\n" );
+ fprintf(stderr, "Using fallback suid method\n");
}
}
+#endif
#endif
- if ( applet-> need_suid == _BB_SUID_ALWAYS ) {
- if ( geteuid ( ) != 0 )
- error_msg_and_die ( "This applet requires root priviledges!" );
- }
- else if ( applet-> need_suid == _BB_SUID_NEVER ) {
- setgid ( rgid ); // drop all priviledges
- setuid ( ruid );
- }
+ 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) ((void)0)
+#endif /* FEATURE_SUID */
+
-#ifdef CONFIG_FEATURE_SUID_CONFIG
+#if ENABLE_FEATURE_COMPRESS_USAGE
+#include "usage_compressed.h"
+#include "unarchive.h"
-#define parse_error(x) { err=x; goto pe_label; }
+static const char *unpack_usage_messages(void)
+{
+ char *outbuf = NULL;
+ bunzip_data *bd;
+ int i;
+ i = start_bunzip(&bd,
+ /* src_fd: */ -1,
+ /* inbuf: */ packed_usage,
+ /* len: */ sizeof(packed_usage));
+ /* read_bunzip can longjmp to start_bunzip, and ultimately
+ * end up here with i != 0 on read data errors! Not trivial */
+ if (!i) {
+ /* Cannot use xmalloc: will leak bd in NOFORK case! */
+ outbuf = malloc_or_warn(SIZEOF_usage_messages);
+ if (outbuf)
+ read_bunzip(bd, outbuf, SIZEOF_usage_messages);
+ }
+ dealloc_bunzip(bd);
+ return outbuf;
+}
+#define dealloc_usage_messages(s) free(s)
-int parse_config_file ( void )
+#else
+
+#define unpack_usage_messages() usage_messages
+#define dealloc_usage_messages(s) ((void)(s))
+
+#endif /* FEATURE_COMPRESS_USAGE */
+
+
+void bb_show_usage(void)
{
- struct stat st;
- char *err = 0;
- FILE *f = 0;
- int lc = 0;
-
- suid_config = 0;
-
- // is there a config file ?
- if ( stat ( CONFIG_FILE, &st ) == 0 ) {
- // is it owned by root with no write perm. for group and others ?
- if ( S_ISREG( st. st_mode ) && ( st. st_uid == 0 ) && (!( st. st_mode & ( S_IWGRP | S_IWOTH )))) {
- // that's ok .. then try to open it
- f = fopen ( CONFIG_FILE, "r" );
-
- if ( f ) {
- char buffer [256];
- int section = 0;
-
- while ( fgets ( buffer, sizeof( buffer ) - 1, f )) {
- char c = buffer [0];
- char *p;
-
- lc++;
-
- p = strchr ( buffer, '#' );
- if ( p )
- *p = 0;
- p = buffer + xstrlen ( buffer );
- while (( p > buffer ) && isspace ( *--p ))
- *p = 0;
-
- if ( p == buffer )
- continue;
-
- if ( c == '[' ) {
- p = strchr ( buffer, ']' );
-
- if ( !p || ( p == ( buffer + 1 ))) // no matching ] or empty []
- parse_error ( "malformed section header" );
-
- *p = 0;
-
- if ( strcasecmp ( buffer + 1, "SUID" ) == 0 )
- section = 1;
- else
- section = -1; // unknown section - just skip
- }
- else if ( section ) {
- switch ( section ) {
- case 1: { // SUID
- int l;
- struct BB_applet *applet;
-
- p = strchr ( buffer, '=' ); // <key>[::space::]*=[::space::]*<value>
-
- if ( !p || ( p == ( buffer + 1 ))) // no = or key is empty
- parse_error ( "malformed keyword" );
-
- l = p - buffer;
- while ( isspace ( buffer [--l] )) { } // skip whitespace
-
- buffer [l+1] = 0;
-
- if (( applet = find_applet_by_name ( buffer ))) {
- struct BB_suid_config *sct = xmalloc ( sizeof( struct BB_suid_config ));
-
- sct-> m_applet = applet;
- sct-> m_next = suid_config;
- suid_config = sct;
-
- while ( isspace ( *++p )) { } // skip whitespace
-
- sct-> m_mode = 0;
-
- switch ( *p++ ) {
- case 'S': sct-> m_mode |= S_ISUID; break;
- case 's': sct-> m_mode |= S_ISUID; // no break
- case 'x': sct-> m_mode |= S_IXUSR; break;
- case '-': break;
- default : parse_error ( "invalid user mode" );
- }
-
- switch ( *p++ ) {
- case 's': sct-> m_mode |= S_ISGID; // no break
- case 'x': sct-> m_mode |= S_IXGRP; break;
- case 'S': break;
- case '-': break;
- default : parse_error ( "invalid group mode" );
- }
-
- switch ( *p ) {
- case 't':
- case 'x': sct-> m_mode |= S_IXOTH; break;
- case 'T':
- case '-': break;
- default : parse_error ( "invalid other mode" );
- }
-
- while ( isspace ( *++p )) { } // skip whitespace
-
- if ( isdigit ( *p )) {
- sct-> m_uid = strtol ( p, &p, 10 );
- if ( *p++ != '.' )
- parse_error ( "parsing <uid>.<gid>" );
- }
- else {
- struct passwd *pwd;
- char *p2 = strchr ( p, '.' );
-
- if ( !p2 )
- parse_error ( "parsing <uid>.<gid>" );
-
- *p2 = 0;
- pwd = getpwnam ( p );
-
- if ( !pwd )
- parse_error ( "invalid user name" );
-
- sct-> m_uid = pwd-> pw_uid;
- p = p2 + 1;
- }
- if ( isdigit ( *p ))
- sct-> m_gid = strtol ( p, &p, 10 );
- else {
- struct group *grp = getgrnam ( p );
-
- if ( !grp )
- parse_error ( "invalid group name" );
-
- sct-> m_gid = grp-> gr_gid;
- }
- }
- break;
- }
- default: // unknown - skip
- break;
- }
- }
- else
- parse_error ( "keyword not within section" );
- }
- fclose ( f );
+ if (ENABLE_SHOW_USAGE) {
+ const char *format_string;
+ const char *p;
+ const char *usage_string = p = unpack_usage_messages();
+ int i;
+
+ i = current_applet - applets;
+ while (i) {
+ while (*p++) continue;
+ i--;
+ }
+
+ format_string = "%s\n\nUsage: %s %s\n\n";
+ if (*p == '\b')
+ format_string = "%s\n\nNo help available.\n\n";
+ fprintf(stderr, format_string, bb_msg_full_version,
+ applet_name, p);
+ dealloc_usage_messages((char*)usage_string);
+ }
+ xfunc_die();
+}
+
+
+static int applet_name_compare(const void *name, const void *vapplet)
+{
+ const struct bb_applet *applet = vapplet;
+
+ return strcmp(name, applet->name);
+}
+
+const struct bb_applet *find_applet_by_name(const char *name)
+{
+ /* Do a binary search to find the applet entry given the name. */
+ return bsearch(name, applets, NUM_APPLETS, sizeof(applets[0]),
+ applet_name_compare);
+}
+
+
+#if ENABLE_FEATURE_INSTALLER
+/* create (sym)links for each applet */
+static void install_links(const char *busybox, int use_symbolic_links)
+{
+ /* directory table
+ * this should be consistent w/ the enum,
+ * busybox.h::bb_install_loc_t, 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
+ };
+
+ 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].install_loc],
+ 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_and_exit(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 {
+ /* we want "<argv[1]>: applet not found", not "busybox: ..." */
+ applet_name = argv[1];
+ run_applet_and_exit(argv[1], argc - 1, argv + 1);
}
- return 1;
-
-pe_label:
- fprintf ( stderr, "Parse error in %s, line %d: %s\n", CONFIG_FILE, lc, err );
- if ( f )
- fclose ( f );
- return 0;
+ bb_error_msg_and_die("applet not found");
}
-#endif
+void run_current_applet_and_exit(int argc, char **argv)
+{
+ /* Reinit some shared global data */
+ optind = 1;
+ xfunc_error_retval = EXIT_FAILURE;
+
+ 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));
+}
-#endif
+void run_applet_and_exit(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));
+}
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+
+int main(int argc, char **argv)
+{
+ const char *s;
+
+#if !BB_MMU
+ /* NOMMU re-exec trick sets high-order bit in first byte of name */
+ if (argv[0][0] & 0x80) {
+ re_execed = 1;
+ argv[0][0] &= 0x7f;
+ }
+#endif
+ applet_name = argv[0];
+ 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_and_exit(applet_name, argc, argv);
+ bb_error_msg_and_die("applet not found");
+}
projects / oweals / busybox.git / blobdiff