* 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>
+#include "busybox.h"
-#if ENABLE_STATIC && __GLIBC__
+/* 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 doesn't cope well with ld --gc-sections).
-#warning See http://sources.redhat.com/bugzilla/show_bug.cgi?id=3400
-#warning Note that glibc is utterly unsuitable for static linking anyway.
+#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
+
+/* Declare <applet>_main() */
+#define PROTOTYPES
+#include "applets.h"
+#undef PROTOTYPES
+
#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
-static const char usage_messages[] =
+/* 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 /* ENABLE_SHOW_USAGE */
+#endif /* SHOW_USAGE */
-#undef APPLET
-#undef APPLET_NOUSAGE
-#undef PROTOTYPES
+/* 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;
-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);
+const struct bb_applet *current_applet;
+const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
+#if !BB_MMU
+bool re_execed;
+#endif
-#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;
+#if ENABLE_FEATURE_SUID_CONFIG
+/* 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;
} *suid_config;
-static int suid_cfg_readable;
+static bool suid_cfg_readable;
/* check if u is member of group g */
static int ingroup(uid_t u, gid_t g)
break;
}
}
- e[1] = 0;
+ 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;
+static const char config_file[] = "/etc/busybox.conf";
/* There are 4 chars + 1 nul for each of user/group/other. */
static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-";
* 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 --- */
+ /* 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)
+
static void parse_config_file(void)
{
struct BB_suid_config *sct_head;
struct BB_suid_config *sct;
- struct BB_applet *applet;
+ const struct bb_applet *applet;
FILE *f;
- char *err;
+ const char *errmsg;
char *s;
char *e;
- int i, lc, section;
+ int i;
+ unsigned lc;
+ smallint section;
char buffer[256];
struct stat st;
- assert(!suid_config); /* Should be set to NULL by bss init. */
+ 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? */
- ) {
+ 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;
}
sct_head = NULL;
section = lc = 0;
- do {
+ while (1) {
s = buffer;
if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
/* Trim leading and trailing whitespace, ignoring comments, and
* check if the resulting string is empty. */
- if (!*(s = get_trimmed_slice(s, strchrnul(s, '#')))) {
+ s = get_trimmed_slice(s, strchrnul(s, '#'));
+ if (!*s) {
continue;
}
/* 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? */
- ) {
+ 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.
* where both key and value could contain inner whitespace. */
/* First get the key (an applet name in our case). */
- if (!!(e = strchr(s, '='))) {
+ e = strchr(s, '=');
+ if (e) {
s = get_trimmed_slice(s, e);
}
if (!e || !*s) { /* Missing '=' or empty key. */
/* 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
+ * Note: this can hide config file bugs which only pop
* up when the busybox configuration is changed. */
- if ((applet = find_applet_by_name(s))) {
+ 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.
e = skip_whitespace(e+1);
- for (i=0 ; i < 3 ; i++) {
+ for (i = 0; i < 3; i++) {
const char *q;
- if (!*(q = strchrnul(mode_chars + 5*i, *e++))) {
+ q = strchrnul(mode_chars + 5*i, *e++);
+ if (!*q) {
parse_error("mode");
}
/* Adjust by -i to account for nul. */
s = skip_whitespace(e);
- /* Note: We require whitespace between the mode and the
+ /* Note: we require whitespace between the mode and the
* user/group info. */
if ((s == e) || !(e = strchr(s, '.'))) {
parse_error("<uid>.<gid>");
}
- *e++ = 0;
+ *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_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 = strtoul(e, &e2, 10);
- if (*e2 || (e == e2)) {
- struct group *grp;
- if (!(grp = getgrnam(e))) {
- parse_error("group");
- }
- sct->m_gid = grp->gr_gid;
+ 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;
parse_error("keyword outside section");
}
- } while (1);
+ } /* while (1) */
pe_label:
fprintf(stderr, "Parse error in %s, line %d: %s\n",
- config_file, lc, err);
+ config_file, lc, errmsg);
fclose(f);
/* Release any allocated memory before returning. */
free(sct_head);
sct_head = sct;
}
- return;
}
-
#else
-#define parse_config_file()
-#endif /* CONFIG_FEATURE_SUID_CONFIG */
+#define parse_config_file() ((void)0)
+#endif /* FEATURE_SUID_CONFIG */
-#ifdef CONFIG_FEATURE_SUID
-static 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 ENABLE_FEATURE_SUID_CONFIG
if (suid_cfg_readable) {
struct BB_suid_config *sct;
+ mode_t m;
for (sct = suid_config; sct; sct = sct->m_next) {
if (sct->m_applet == applet)
- break;
+ goto found;
}
- 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 */
+ /* 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 xsetgid(rgid); /* no sgid -> drop */
+ }
+ if (sct->m_uid != 0) {
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);
+ else xsetuid(ruid); /* no suid -> drop */
}
return;
- } else {
-#ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
- static int onetime = 0;
+ }
+#if !ENABLE_FEATURE_SUID_CONFIG_QUIET
+ {
+ static bool onetime = 0;
if (!onetime) {
onetime = 1;
fprintf(stderr, "Using fallback suid method\n");
}
-#endif
}
+#endif
#endif
if (applet->need_suid == _BB_SUID_ALWAYS) {
- if (geteuid()) bb_error_msg_and_die("applet requires root privileges!");
+ 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 */
-
+#define check_suid(x) ((void)0)
+#endif /* FEATURE_SUID */
-#ifdef CONFIG_FEATURE_COMPRESS_USAGE
+#if ENABLE_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);
+ 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);
}
- /* 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;
+ dealloc_bunzip(bd);
+ return outbuf;
}
+#define dealloc_usage_messages(s) free(s)
#else
+
#define unpack_usage_messages() usage_messages
-#endif /* ENABLE_FEATURE_COMPRESS_USAGE */
+#define dealloc_usage_messages(s) ((void)(s))
+
+#endif /* FEATURE_COMPRESS_USAGE */
+
void bb_show_usage(void)
{
if (ENABLE_SHOW_USAGE) {
const char *format_string;
- const char *usage_string = unpack_usage_messages();
+ const char *p;
+ const char *usage_string = p = unpack_usage_messages();
int i;
- for (i = applet_using - applets; i > 0;)
- if (!*usage_string++) --i;
+ i = current_applet - applets;
+ while (i) {
+ while (*p++) continue;
+ i--;
+ }
format_string = "%s\n\nUsage: %s %s\n\n";
- if (*usage_string == '\b')
+ if (*p == '\b')
format_string = "%s\n\nNo help available.\n\n";
- fprintf (stderr, format_string, bb_msg_full_version,
- applet_using->name, usage_string);
+ fprintf(stderr, format_string, bb_msg_full_version,
+ applet_name, p);
+ dealloc_usage_messages((char*)usage_string);
}
-
- exit(xfunc_error_retval);
+ xfunc_die();
}
+
static int applet_name_compare(const void *name, const void *vapplet)
{
- const struct BB_applet *applet = 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)
+const struct bb_applet *find_applet_by_name(const char *name)
{
- return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
+ /* Do a binary search to find the applet entry given the name. */
+ return bsearch(name, applets, NUM_APPLETS, sizeof(applets[0]),
applet_name_compare);
}
-void run_applet_by_name(const char *name, int argc, char **argv)
+
+#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_SUID_CONFIG) parse_config_file();
+ 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;
+ }
- 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));
+ /* 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);
+ }
+
+ bb_error_msg_and_die("applet not found");
+}
+
+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));
+}
+
+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));
+}
+
+
+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