/* 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, flags) \ {#name, oldname##_main, OPTSTR_##oldname, flags}, struct toy_list toy_list[] = { #include "generated/newtoys.h" }; // global context for this command. struct toy_context toys; union global_union this; char toybuf[4096], libbuf[4096]; struct toy_list *toy_find(char *name) { 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 (!strncmp(name,"toybox",6)) return toy_list; bottom = 1; // Binary search to find this command. 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, flags) OPTSTR_##oldname || static const int NEED_OPTIONS = #include "generated/newtoys.h" 0; // Ends the opts || opts || opts... // Subset of init needed by singlemain 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)); if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) { if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2]) if (!(toys.which = toy_find(toys.argv[2]))) return; show_help(); 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); } // 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) { if (!setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root else euid = uid; } } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list) error_msg("Not installed suid root"); if ((which->flags & TOYFLAG_NEEDROOT) && euid) { toys.exithelp++; 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)); // Subset of init needed by singlemain. toy_singleinit(which, argv); } // Like exec() but runs an internal toybox command instead of another file. // Only returns if it can't run command internally, otherwise exit() when done. void toy_exec(char *argv[]) { struct toy_list *which; // Return if we can't find it, or need to re-exec to acquire root, // or if stack depth is getting silly. if (!(which = toy_find(argv[0]))) return; if (toys.recursion && (which->flags & TOYFLAG_ROOTONLY) && getuid()) return; if (toys.recursion++ > 5) return; // don't blank old optargs if our new argc lives in the old optargs. if (argv>=toys.optargs && argv<=toys.optargs+toys.optc) toys.optargs = 0; // 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; toys.which = toy_list; if (toys.argv[1]) { toys.optc = toys.recursion = 0; toy_exec(toys.argv+1); if (toys.argv[1][0] == '-') goto list; error_exit("Unknown command %s",toys.argv[1]); } list: // 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[]) { if (CFG_TOYBOX) { // 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(); } else { // a single toybox command built standalone with no multiplexer toy_singleinit(toy_list, argv); toy_list->toy_main(); } xexit(); }