1 /* Toybox infrastructure.
3 * Copyright 2006 Rob Landley <rob@landley.net>
8 // Populate toy_list[].
12 #define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags},
13 #define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags},
15 struct toy_list toy_list[] = {
16 #include "generated/newtoys.h"
19 // global context for this applet.
21 struct toy_context toys;
22 union global_union this;
25 struct toy_list *toy_find(char *name)
27 int top, bottom, middle;
29 // If the name starts with "toybox" accept that as a match. Otherwise
30 // skip the first entry, which is out of order.
32 if (!strncmp(name,"toybox",6)) return toy_list;
35 // Binary search to find this applet.
37 top = ARRAY_LEN(toy_list)-1;
41 middle = (top+bottom)/2;
42 if (middle<bottom || middle>top) return NULL;
43 result = strcmp(name,toy_list[middle].name);
44 if (!result) return toy_list+middle;
45 if (result<0) top=--middle;
46 else bottom = ++middle;
50 // Figure out whether or not anything is using the option parsing logic,
51 // because the compiler can't figure out whether or not to optimize it away
52 // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
53 // stuff out via dead code elimination.
57 #define NEWTOY(name, opts, flags) opts ||
58 #define OLDTOY(name, oldname, opts, flags) opts ||
59 static const int NEED_OPTIONS =
60 #include "generated/newtoys.h"
61 0; // Ends the opts || opts || opts...
63 // Setup toybox global state for this command.
65 void toy_init(struct toy_list *which, char *argv[])
67 // Drop permissions for non-suid commands.
69 if (CFG_TOYBOX_SUID) {
70 uid_t uid = getuid(), euid = geteuid();
72 if (!(which->flags & TOYFLAG_STAYROOT)) {
73 if (uid != euid) xsetuid(euid=uid);
74 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
75 error_msg("Not installed suid root");
77 if ((which->flags & TOYFLAG_NEEDROOT) && euid) error_exit("Not root");
80 // Free old toys contents (to be reentrant), but leave rebound if any
82 if (toys.optargs != toys.argv+1) free(toys.optargs);
83 memset(&toys, 0, offsetof(struct toy_context, rebound));
87 if (NEED_OPTIONS && which->options) get_optflags();
89 toys.optargs = argv+1;
90 for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++);
92 toys.old_umask = umask(0);
93 if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
96 // Like exec() but runs an internal toybox command instead of another file.
97 // Only returns if it can't find the command, otherwise exit() when done.
98 void toy_exec(char *argv[])
100 struct toy_list *which;
102 which = toy_find(argv[0]);
104 toy_init(which, argv);
105 toys.which->toy_main();
106 if (fflush(NULL) || ferror(stdout)) perror_exit("write");
110 // Multiplexer command, first argument is command to run, rest are args to that.
111 // If first argument starts with - output list of command install paths.
113 void toybox_main(void)
115 static char *toy_paths[]={"usr/","bin/","sbin/",0};
118 toys.which = toy_list;
120 if (toys.argv[1][0]!='-') {
121 toy_exec(toys.argv+1);
122 error_exit("Unknown command %s",toys.argv[1]);
126 // Output list of applets.
127 for (i=1; i<ARRAY_LEN(toy_list); i++) {
128 int fl = toy_list[i].flags;
129 if (fl & TOYMASK_LOCATION) {
132 for (j=0; toy_paths[j]; j++)
133 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
135 len += printf("%s ",toy_list[i].name);
145 int main(int argc, char *argv[])
147 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "");
149 // Trim path off of command name
150 *argv = basename(*argv);
152 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
153 // (It will adjust it back before calling toy_exec().)