-/* vi: set ts=4 :*/
/* Toybox infrastructure.
*
* Copyright 2006 Rob Landley <rob@landley.net>
#include "toys.h"
+#ifndef TOYBOX_VERSION
+#define TOYBOX_VERSION "0.7.3"
+#endif
+
// Populate toy_list[].
#undef NEWTOY
#undef OLDTOY
-#define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags},
-#define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags},
+#define NEWTOY(name, opts, flags) {#name, name##_main, OPTSTR_##name, flags},
+#define OLDTOY(name, oldname, flags) \
+ {#name, oldname##_main, OPTSTR_##oldname, flags},
struct toy_list toy_list[] = {
#include "generated/newtoys.h"
};
-// global context for this applet.
+// global context for this command.
struct toy_context toys;
union global_union this;
-char toybuf[4096];
+char toybuf[4096], libbuf[4096];
struct toy_list *toy_find(char *name)
{
- int top, bottom, middle;
+ int top, bottom, middle;
+
+ if (!CFG_TOYBOX) return 0;
- // If the name starts with "toybox" accept that as a match. Otherwise
- // skip the first entry, which is out of order.
+ // If the name starts with "toybox" accept that as a match. Otherwise
+ // skip the first entry, which is out of order.
- if (!strncmp(name,"toybox",6)) return toy_list;
- bottom = 1;
+ if (!strncmp(name,"toybox",6)) return toy_list;
+ bottom = 1;
- // Binary search to find this applet.
+ // Binary search to find this command.
- top = ARRAY_LEN(toy_list)-1;
- for (;;) {
- int result;
+ top = ARRAY_LEN(toy_list)-1;
+ for (;;) {
+ int result;
- middle = (top+bottom)/2;
- if (middle<bottom || middle>top) return NULL;
- result = strcmp(name,toy_list[middle].name);
- if (!result) return toy_list+middle;
- if (result<0) top=--middle;
- else bottom = ++middle;
- }
+ middle = (top+bottom)/2;
+ if (middle<bottom || middle>top) return NULL;
+ result = strcmp(name,toy_list[middle].name);
+ if (!result) return toy_list+middle;
+ if (result<0) top = --middle;
+ else bottom = ++middle;
+ }
}
// Figure out whether or not anything is using the option parsing logic,
#undef NEWTOY
#undef OLDTOY
#define NEWTOY(name, opts, flags) opts ||
-#define OLDTOY(name, oldname, opts, flags) opts ||
+#define OLDTOY(name, oldname, flags) OPTSTR_##oldname ||
static const int NEED_OPTIONS =
#include "generated/newtoys.h"
0; // Ends the opts || opts || opts...
+static void unknown(char *name)
+{
+ toys.exitval = 127;
+ toys.which = toy_list;
+ error_exit("Unknown command %s", name);
+}
+
// Setup toybox global state for this command.
+static void toy_singleinit(struct toy_list *which, char *argv[])
+{
+ toys.which = which;
+ toys.argv = argv;
+
+ if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "C"+!!(which->flags & TOYFLAG_LOCALE));
+
+ // Parse --help and --version for (almost) all commands
+ if (CFG_TOYBOX_HELP_DASHDASH && !(which->flags & TOYFLAG_NOHELP) && argv[1]) {
+ if (!strcmp(argv[1], "--help")) {
+ if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2])
+ if (!(toys.which = toy_find(toys.argv[2]))) unknown(toys.argv[2]);
+ show_help(stdout);
+ xexit();
+ }
+
+ if (!strcmp(argv[1], "--version")) {
+ xputs("toybox "TOYBOX_VERSION);
+ xexit();
+ }
+ }
+
+ if (NEED_OPTIONS && which->options) get_optflags();
+ else {
+ toys.optargs = argv+1;
+ for (toys.optc = 0; toys.optargs[toys.optc]; toys.optc++);
+ }
+ toys.old_umask = umask(0);
+ if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
+ toys.signalfd--;
+ toys.toycount = ARRAY_LEN(toy_list);
+}
+// Full init needed by multiplexer or reentrant calls, calls singleinit at end
void toy_init(struct toy_list *which, char *argv[])
{
- // Drop permissions for non-suid commands.
+ void *oldwhich = toys.which;
- if (CFG_TOYBOX_SUID) {
- uid_t uid = getuid(), euid = geteuid();
+ // Drop permissions for non-suid commands.
- if (!(which->flags & TOYFLAG_STAYROOT)) {
- if (uid != euid) xsetuid(euid=uid);
- } else if (CFG_TOYBOX_DEBUG && uid)
- error_exit("Not installed suid root");
+ if (CFG_TOYBOX_SUID) {
+ if (!toys.which) toys.which = toy_list;
- if ((which->flags & TOYFLAG_NEEDROOT) && euid)
- error_exit("Not root");
- }
+ uid_t uid = getuid(), euid = geteuid();
- // Free old toys contents (to be reentrant)
+ if (!(which->flags & TOYFLAG_STAYROOT)) {
+ if (uid != euid) {
+ if (setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root
+ euid = uid;
+ toys.wasroot++;
+ }
+ } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
+ error_msg("Not installed suid root");
- if (toys.optargs != toys.argv+1) free(toys.optargs);
- memset(&toys, 0, sizeof(struct toy_context));
+ if ((which->flags & TOYFLAG_NEEDROOT) && euid) help_exit("Not root");
+ }
- toys.which = which;
- toys.argv = argv;
- if (NEED_OPTIONS && which->options) get_optflags();
- else toys.optargs = argv+1;
- toys.old_umask = umask(0);
- if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
+ // Free old toys contents (to be reentrant), but leave rebound if any
+ // don't blank old optargs if our new argc lives in the old optargs.
+ if (argv<toys.optargs || argv>toys.optargs+toys.optc) free(toys.optargs);
+ memset(&toys, 0, offsetof(struct toy_context, rebound));
+ if (oldwhich) memset(&this, 0, sizeof(this));
+
+ // Continue to portion of init needed by standalone commands
+ toy_singleinit(which, argv);
}
// Like exec() but runs an internal toybox command instead of another file.
-// Only returns if it can't find the command, otherwise exit() when done.
+// Only returns if it can't run command internally, otherwise exit() when done.
void toy_exec(char *argv[])
{
- struct toy_list *which;
+ struct toy_list *which;
+
+ // Return if we can't find it (which includes no multiplexer case),
+ if (!(which = toy_find(*argv))) return;
+
+ // Return if stack depth getting noticeable (proxy for leaked heap, etc).
- which = toy_find(argv[0]);
- if (!which) return;
- toy_init(which, argv);
- toys.which->toy_main();
- exit(toys.exitval);
+ // Compiler writers have decided subtracting char * is undefined behavior,
+ // so convert to integers. (LP64 says sizeof(long)==sizeof(pointer).)
+ if (!CFG_TOYBOX_NORECURSE)
+ if (toys.stacktop && labs((long)toys.stacktop-(long)&which)>6000) return;
+
+ // Return if we need to re-exec to acquire root via suid bit.
+ if (toys.which && (which->flags&TOYFLAG_ROOTONLY) && toys.wasroot) return;
+
+ // Run command
+ toy_init(which, argv);
+ if (toys.which) toys.which->toy_main();
+ xexit();
}
// Multiplexer command, first argument is command to run, rest are args to that.
// If first argument starts with - output list of command install paths.
-
void toybox_main(void)
{
- static char *toy_paths[]={"usr/","bin/","sbin/",0};
- int i, len = 0;
-
- if (toys.argv[1]) {
- if (toys.argv[1][0]!='-') {
- toy_exec(toys.argv+1);
- toys.which = toy_list;
- error_exit("Unknown command %s",toys.argv[1]);
- }
- }
-
- // Output list of applets.
- for (i=1; i<ARRAY_LEN(toy_list); i++) {
- int fl = toy_list[i].flags;
- if (fl & TOYMASK_LOCATION) {
- if (toys.argv[1]) {
- int j;
- for (j=0; toy_paths[j]; j++)
- if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
- }
- len += printf("%s ",toy_list[i].name);
- if (len>65) {
- xputc('\n');
- len=0;
- }
- }
- }
- xputc('\n');
+ static char *toy_paths[]={"usr/","bin/","sbin/",0};
+ int i, len = 0;
+
+ // fast path: try to exec immediately.
+ // (Leave toys.which null to disable suid return logic.)
+ if (toys.argv[1]) toy_exec(toys.argv+1);
+
+ // For early error reporting
+ toys.which = toy_list;
+
+ if (toys.argv[1] && toys.argv[1][0] != '-') unknown(toys.argv[1]);
+
+ // Output list of command.
+ for (i=1; i<ARRAY_LEN(toy_list); i++) {
+ int fl = toy_list[i].flags;
+ if (fl & TOYMASK_LOCATION) {
+ if (toys.argv[1]) {
+ int j;
+ for (j=0; toy_paths[j]; j++)
+ if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
+ }
+ len += printf("%s",toy_list[i].name);
+ if (++len > 65) len = 0;
+ xputc(len ? ' ' : '\n');
+ }
+ }
+ xputc('\n');
}
int main(int argc, char *argv[])
{
- // Artificial scope to eat less stack for things we call
- {
- char *name;
-
- // Trim path off of command name
- name = strrchr(argv[0], '/');
- if (!name) name=argv[0];
- else name++;
- argv[0] = name;
- }
-
- // Call the multiplexer, adjusting this argv[] to be its' argv[1].
- // (It will adjust it back before calling toy_exec().)
- toys.argv = argv-1;
- toybox_main();
- return 0;
+ if (!*argv) return 127;
+
+ // Snapshot stack location so we can detect recursion depth later.
+ // This is its own block so probe doesn't permanently consume stack.
+ else {
+ int stack;
+
+ toys.stacktop = &stack;
+ }
+ *argv = getbasename(*argv);
+
+ // Up to and including Android M, bionic's dynamic linker added a handler to
+ // cause a crash dump on SIGPIPE. That was removed in Android N, but adbd
+ // was still setting the SIGPIPE disposition to SIG_IGN, and its children
+ // were inheriting that. In Android O, adbd is fixed, but manually asking
+ // for the default disposition is harmless, and it'll be a long time before
+ // no one's using anything older than O!
+ if (CFG_TOYBOX_ON_ANDROID) signal(SIGPIPE, SIG_DFL);
+
+ // If nommu can't fork, special reentry path.
+ // Use !stacktop to signal "vfork happened", both before and after xexec()
+ if (!CFG_TOYBOX_FORK) {
+ if (0x80 & **argv) {
+ **argv &= 0x7f;
+ toys.stacktop = 0;
+ }
+ }
+
+ if (CFG_TOYBOX) {
+ // Call the multiplexer, adjusting this argv[] to be its' argv[1].
+ // (It will adjust it back before calling toy_exec().)
+ toys.argv = argv-1;
+ toybox_main();
+ } else {
+ // a single toybox command built standalone with no multiplexer
+ toy_singleinit(toy_list, argv);
+ toy_list->toy_main();
+ }
+
+ xexit();
}
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