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/* Toybox infrastructure.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*/
#include "toys.h"
// 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},
struct toy_list toy_list[] = {
#include "generated/newtoys.h"
};
// global context for this applet.
struct toy_context toys;
union global_union this;
char toybuf[4096];
struct toy_list *toy_find(char *name)
{
int top, bottom, middle;
// 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;
// Binary search to find this applet.
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;
}
}
// Figure out whether or not anything is using the option parsing logic,
// because the compiler can't figure out whether or not to optimize it away
// on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
// stuff out via dead code elimination.
#undef NEWTOY
#undef OLDTOY
#define NEWTOY(name, opts, flags) opts ||
#define OLDTOY(name, oldname, opts, flags) opts ||
static const int NEED_OPTIONS =
#include "generated/newtoys.h"
0; // Ends the opts || opts || opts...
// Setup toybox global state for this command.
void toy_init(struct toy_list *which, char *argv[])
{
// Drop permissions for non-suid commands.
if (CFG_TOYBOX_SUID) {
uid_t uid = getuid(), euid = geteuid();
if (!(which->flags & TOYFLAG_STAYROOT)) {
if (uid != euid) xsetuid(euid=uid);
} else if (CFG_TOYBOX_DEBUG && uid) error_exit("Not installed suid root");
if ((which->flags & TOYFLAG_NEEDROOT) && euid) error_exit("Not root");
}
// Free old toys contents (to be reentrant), but leave rebound if any
if (toys.optargs != toys.argv+1) free(toys.optargs);
memset(&toys, 0, offsetof(struct toy_context, rebound));
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);
}
// 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.
void toy_exec(char *argv[])
{
struct toy_list *which;
which = toy_find(argv[0]);
if (!which) return;
toy_init(which, argv);
toys.which->toy_main();
exit(toys.exitval);
}
// 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');
}
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;
}
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