view main.c @ 818:264b9da809df

Simplify license text, as mentioned on the mailing list. Reasoning: it was never my intent to require anybody to copy license text into another project if they cut and pasted something out of toybox. The "permission for any purpose" is as close to public domain as you can get in our current screwed up legal system without making people uncomfortable the _other_ way. (Besides, my initial reading of that was "all copies of the source code" but that's not what it says, and somebody pointed out that Android has "show license text" options because paranoid lawyers think that sort of thing applies to the BINARY version, which is nuts.)
author Rob Landley <rob@landley.net>
date Thu, 14 Mar 2013 09:02:37 -0500
parents 3d7526f6115b
children d90f14e011b8
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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 && which != toy_list)
      error_msg("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;
    for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++);
  }
  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();
  if (fflush(NULL) || ferror(stdout)) perror_exit("write");
  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;

  toys.which = toy_list;
  if (toys.argv[1]) {
    if (toys.argv[1][0]!='-') {
      toy_exec(toys.argv+1);
      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[])
{
  if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "");

  // Trim path off of command name
  *argv = basename(*argv);

  // 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;
}