1 /* Toybox infrastructure.
3 * Copyright 2006 Rob Landley <rob@landley.net>
9 #define TOYBOX_VERSION "0.7.1"
12 // Populate toy_list[].
16 #define NEWTOY(name, opts, flags) {#name, name##_main, OPTSTR_##name, flags},
17 #define OLDTOY(name, oldname, flags) \
18 {#name, oldname##_main, OPTSTR_##oldname, flags},
20 struct toy_list toy_list[] = {
21 #include "generated/newtoys.h"
24 // global context for this command.
26 struct toy_context toys;
27 union global_union this;
28 char toybuf[4096], libbuf[4096];
30 struct toy_list *toy_find(char *name)
32 int top, bottom, middle;
34 if (!CFG_TOYBOX) return 0;
36 // If the name starts with "toybox" accept that as a match. Otherwise
37 // skip the first entry, which is out of order.
39 if (!strncmp(name,"toybox",6)) return toy_list;
42 // Binary search to find this command.
44 top = ARRAY_LEN(toy_list)-1;
48 middle = (top+bottom)/2;
49 if (middle<bottom || middle>top) return NULL;
50 result = strcmp(name,toy_list[middle].name);
51 if (!result) return toy_list+middle;
52 if (result<0) top=--middle;
53 else bottom = ++middle;
57 // Figure out whether or not anything is using the option parsing logic,
58 // because the compiler can't figure out whether or not to optimize it away
59 // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
60 // stuff out via dead code elimination.
64 #define NEWTOY(name, opts, flags) opts ||
65 #define OLDTOY(name, oldname, flags) OPTSTR_##oldname ||
66 static const int NEED_OPTIONS =
67 #include "generated/newtoys.h"
68 0; // Ends the opts || opts || opts...
70 // Setup toybox global state for this command.
71 static void toy_singleinit(struct toy_list *which, char *argv[])
76 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "C"+!!(which->flags & TOYFLAG_LOCALE));
78 if (CFG_TOYBOX_HELP_DASHDASH && !(which->flags & TOYFLAG_NOHELP)
79 && argv[1] && !strcmp(argv[1], "--help"))
81 if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2])
82 if (!(toys.which = toy_find(toys.argv[2]))) return;
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);
95 toys.toycount = ARRAY_LEN(toy_list);
98 // Full init needed by multiplexer or reentrant calls, calls singleinit at end
99 void toy_init(struct toy_list *which, char *argv[])
101 void *oldwhich = toys.which;
103 // Drop permissions for non-suid commands.
105 if (CFG_TOYBOX_SUID) {
106 if (!toys.which) toys.which = toy_list;
108 uid_t uid = getuid(), euid = geteuid();
110 if (!(which->flags & TOYFLAG_STAYROOT)) {
112 if (setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root
116 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
117 error_msg("Not installed suid root");
119 if ((which->flags & TOYFLAG_NEEDROOT) && euid) help_exit("Not root");
122 // Free old toys contents (to be reentrant), but leave rebound if any
123 // don't blank old optargs if our new argc lives in the old optargs.
124 if (argv<toys.optargs || argv>toys.optargs+toys.optc) free(toys.optargs);
125 memset(&toys, 0, offsetof(struct toy_context, rebound));
126 if (oldwhich) memset(&this, 0, sizeof(this));
128 // Continue to portion of init needed by standalone commands
129 toy_singleinit(which, argv);
132 // Like exec() but runs an internal toybox command instead of another file.
133 // Only returns if it can't run command internally, otherwise exit() when done.
134 void toy_exec(char *argv[])
136 struct toy_list *which;
138 // Return if we can't find it (which includes no multiplexer case),
139 if (!(which = toy_find(*argv))) return;
141 // Return if stack depth getting noticeable (proxy for leaked heap, etc).
143 // Compiler writers have decided subtracting char * is undefined behavior,
144 // so convert to integers. (LP64 says sizeof(long)==sizeof(pointer).)
145 if (!CFG_TOYBOX_NORECURSE)
146 if (toys.stacktop && labs((long)toys.stacktop-(long)&which)>6000) return;
148 // Return if we need to re-exec to acquire root via suid bit.
149 if (toys.which && (which->flags&TOYFLAG_ROOTONLY) && toys.wasroot) return;
152 toy_init(which, argv);
153 if (toys.which) toys.which->toy_main();
157 // Multiplexer command, first argument is command to run, rest are args to that.
158 // If first argument starts with - output list of command install paths.
159 void toybox_main(void)
161 static char *toy_paths[]={"usr/","bin/","sbin/",0};
164 // fast path: try to exec immediately.
165 // (Leave toys.which null to disable suid return logic.)
166 if (toys.argv[1]) toy_exec(toys.argv+1);
168 // For early error reporting
169 toys.which = toy_list;
172 if (!strcmp("--version", toys.argv[1])) {
173 xputs(TOYBOX_VERSION);
176 if (toys.argv[1][0] != '-') {
178 error_exit("Unknown command %s", toys.argv[1]);
182 // Output list of command.
183 for (i=1; i<ARRAY_LEN(toy_list); i++) {
184 int fl = toy_list[i].flags;
185 if (fl & TOYMASK_LOCATION) {
188 for (j=0; toy_paths[j]; j++)
189 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
191 len += printf("%s",toy_list[i].name);
192 if (++len > 65) len = 0;
193 xputc(len ? ' ' : '\n');
199 int main(int argc, char *argv[])
201 if (!*argv) return 127;
203 // Snapshot stack location so we can detect recursion depth later.
204 // This is its own block so probe doesn't permanently consume stack.
208 toys.stacktop = &stack;
210 *argv = getbasename(*argv);
212 // If nommu can't fork, special reentry path.
213 // Use !stacktop to signal "vfork happened", both before and after xexec()
214 if (!CFG_TOYBOX_FORK) {
222 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
223 // (It will adjust it back before calling toy_exec().)
227 // a single toybox command built standalone with no multiplexer
228 toy_singleinit(toy_list, argv);
229 toy_list->toy_main();