| /* 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_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); |
| #ifdef CFG_TOYBOX_I18N |
| setlocale(LC_ALL, ""); |
| #endif |
| 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; |
| |
| 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[]) |
| { |
| // 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; |
| } |