2 /* Toybox infrastructure.
4 * Copyright 2006 Rob Landley <rob@landley.net>
9 // Populate toy_list[].
13 #define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags},
14 #define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags},
16 struct toy_list toy_list[] = {
17 #include "generated/newtoys.h"
20 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
22 // global context for this applet.
24 struct toy_context toys;
25 union global_union this;
28 struct toy_list *toy_find(char *name)
30 int top, bottom, middle;
32 // If the name starts with "toybox" accept that as a match. Otherwise
33 // skip the first entry, which is out of order.
35 if (!strncmp(name,"toybox",6)) return toy_list;
38 // Binary search to find this applet.
44 middle = (top+bottom)/2;
45 if (middle<bottom || middle>top) return NULL;
46 result = strcmp(name,toy_list[middle].name);
47 if (!result) return toy_list+middle;
48 if (result<0) top=--middle;
49 else bottom = ++middle;
53 // Figure out whether or not anything is using the option parsing logic,
54 // because the compiler can't figure out whether or not to optimize it away
55 // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
56 // stuff out via dead code elimination.
60 #define NEWTOY(name, opts, flags) opts ||
61 #define OLDTOY(name, oldname, opts, flags) opts ||
62 static const int NEED_OPTIONS =
63 #include "generated/newtoys.h"
64 0; // Ends the opts || opts || opts...
66 // Setup toybox global state for this command.
68 void toy_init(struct toy_list *which, char *argv[])
70 // Drop permissions for non-suid commands.
72 if (CFG_TOYBOX_SUID) {
73 uid_t uid = getuid(), euid = geteuid();
75 if (!(which->flags & TOYFLAG_STAYROOT)) {
76 if (uid != euid) xsetuid(euid=uid);
77 } else if (CFG_TOYBOX_DEBUG && uid)
78 error_exit("Not installed suid root");
80 if ((which->flags & TOYFLAG_NEEDROOT) && euid)
81 error_exit("Not root");
84 // Free old toys contents (to be reentrant)
86 if (toys.optargs != toys.argv+1) free(toys.optargs);
87 bzero(&toys, sizeof(struct toy_context));
91 if (NEED_OPTIONS && which->options) get_optflags();
92 else toys.optargs = argv+1;
93 if (which->flags & TOYFLAG_UMASK) toys.old_umask = umask(0);
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();
109 // Multiplexer command, first argument is command to run, rest are args to that.
110 // If first argument starts with - output list of command install paths.
112 void toybox_main(void)
114 static char *toy_paths[]={"usr/","bin/","sbin/",0};
118 if (toys.argv[1][0]!='-') {
119 toy_exec(toys.argv+1);
120 toys.which = toy_list;
121 error_exit("Unknown command %s",toys.argv[1]);
125 // Output list of applets.
126 for (i=1; i<TOY_LIST_LEN; i++) {
127 int fl = toy_list[i].flags;
128 if (fl & TOYMASK_LOCATION) {
131 for (j=0; toy_paths[j]; j++)
132 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
134 len += printf("%s ",toy_list[i].name);
144 int main(int argc, char *argv[])
146 // Artificial scope to eat less stack for things we call
150 // Trim path off of command name
151 name = rindex(argv[0], '/');
152 if (!name) name=argv[0];
157 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
158 // (It will adjust it back before calling toy_exec().)