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 command.
21 struct toy_context toys;
22 union global_union this;
23 char toybuf[4096], libbuf[4096];
25 struct toy_list *toy_find(char *name)
27 int top, bottom, middle;
29 if (!CFG_TOYBOX) return 0;
31 // If the name starts with "toybox" accept that as a match. Otherwise
32 // skip the first entry, which is out of order.
34 if (!strncmp(name,"toybox",6)) return toy_list;
37 // Binary search to find this command.
39 top = ARRAY_LEN(toy_list)-1;
43 middle = (top+bottom)/2;
44 if (middle<bottom || middle>top) return NULL;
45 result = strcmp(name,toy_list[middle].name);
46 if (!result) return toy_list+middle;
47 if (result<0) top=--middle;
48 else bottom = ++middle;
52 // Figure out whether or not anything is using the option parsing logic,
53 // because the compiler can't figure out whether or not to optimize it away
54 // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
55 // stuff out via dead code elimination.
59 #define NEWTOY(name, opts, flags) opts ||
60 #define OLDTOY(name, oldname, opts, flags) opts ||
61 static const int NEED_OPTIONS =
62 #include "generated/newtoys.h"
63 0; // Ends the opts || opts || opts...
65 // Subset of init needed by singlemain
66 static void toy_singleinit(struct toy_list *which, char *argv[])
71 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "C"+!!(which->flags & TOYFLAG_LOCALE));
73 if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) {
74 if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2])
75 if (!(toys.which = toy_find(toys.argv[2]))) return;
80 if (NEED_OPTIONS && which->options) get_optflags();
82 toys.optargs = argv+1;
83 for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++);
85 toys.old_umask = umask(0);
86 if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
88 toys.toycount = ARRAY_LEN(toy_list);
91 // Setup toybox global state for this command.
93 void toy_init(struct toy_list *which, char *argv[])
95 // Drop permissions for non-suid commands.
97 if (CFG_TOYBOX_SUID) {
98 uid_t uid = getuid(), euid = geteuid();
100 if (!(which->flags & TOYFLAG_STAYROOT)) {
102 if (!setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root
105 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
106 error_msg("Not installed suid root");
108 if ((which->flags & TOYFLAG_NEEDROOT) && euid) {
110 error_exit("Not root");
114 // Free old toys contents (to be reentrant), but leave rebound if any
116 if (toys.optargs != toys.argv+1) free(toys.optargs);
117 memset(&toys, 0, offsetof(struct toy_context, rebound));
119 // Subset of init needed by singlemain.
120 toy_singleinit(which, argv);
123 // Like exec() but runs an internal toybox command instead of another file.
124 // Only returns if it can't run command internally, otherwise exit() when done.
125 void toy_exec(char *argv[])
127 struct toy_list *which;
129 // Return if we can't find it, or need to re-exec to acquire root,
130 // or if stack depth is getting silly.
131 if (!(which = toy_find(argv[0]))) return;
132 if (toys.recursion && (which->flags & TOYFLAG_ROOTONLY) && getuid()) return;
133 if (toys.recursion++ > 5) return;
136 toy_init(which, argv);
137 if (toys.which) toys.which->toy_main();
138 if (fflush(NULL) || ferror(stdout)) perror_exit("write");
142 // Multiplexer command, first argument is command to run, rest are args to that.
143 // If first argument starts with - output list of command install paths.
145 void toybox_main(void)
147 static char *toy_paths[]={"usr/","bin/","sbin/",0};
150 toys.which = toy_list;
152 toys.optc = toys.recursion = 0;
153 toy_exec(toys.argv+1);
154 if (toys.argv[1][0] == '-') goto list;
156 error_exit("Unknown command %s",toys.argv[1]);
160 // Output list of command.
161 for (i=1; i<ARRAY_LEN(toy_list); i++) {
162 int fl = toy_list[i].flags;
163 if (fl & TOYMASK_LOCATION) {
166 for (j=0; toy_paths[j]; j++)
167 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
169 len += printf("%s",toy_list[i].name);
170 if (++len > 65) len = 0;
171 xputc(len ? ' ' : '\n');
177 int main(int argc, char *argv[])
180 // Trim path off of command name
181 *argv = basename(*argv);
183 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
184 // (It will adjust it back before calling toy_exec().)
188 // a single toybox command built standalone with no multiplexer
189 toy_singleinit(toy_list, argv);
190 toy_list->toy_main();
191 if (fflush(NULL) || ferror(stdout)) perror_exit("write");