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 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 command.
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 // Subset of init needed by singlemain
64 static void toy_singleinit(struct toy_list *which, char *argv[])
69 if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) {
70 if (toys.which == toy_list && toys.argv[2])
71 if (!(toys.which = toy_find(toys.argv[2]))) return;
76 if (NEED_OPTIONS && which->options) get_optflags();
78 toys.optargs = argv+1;
79 for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++);
81 toys.old_umask = umask(0);
82 if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
85 // Setup toybox global state for this command.
87 void toy_init(struct toy_list *which, char *argv[])
89 // Drop permissions for non-suid commands.
91 if (CFG_TOYBOX_SUID) {
92 uid_t uid = getuid(), euid = geteuid();
94 if (!(which->flags & TOYFLAG_STAYROOT)) {
96 if (!setuid(euid=uid)) perror_exit("setuid"); // drop root
97 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
98 error_msg("Not installed suid root");
100 if ((which->flags & TOYFLAG_NEEDROOT) && euid) error_exit("Not root");
103 // Free old toys contents (to be reentrant), but leave rebound if any
105 if (toys.optargs != toys.argv+1) free(toys.optargs);
106 memset(&toys, 0, offsetof(struct toy_context, rebound));
108 // Subset of init needed by singlemain.
109 toy_singleinit(which, argv);
112 // Like exec() but runs an internal toybox command instead of another file.
113 // Only returns if it can't find the command, otherwise exit() when done.
114 void toy_exec(char *argv[])
116 struct toy_list *which;
118 if (!(which = toy_find(argv[0]))) return;
119 toy_init(which, argv);
120 if (toys.which) toys.which->toy_main();
121 if (fflush(NULL) || ferror(stdout)) perror_exit("write");
125 // Multiplexer command, first argument is command to run, rest are args to that.
126 // If first argument starts with - output list of command install paths.
128 void toybox_main(void)
130 static char *toy_paths[]={"usr/","bin/","sbin/",0};
133 toys.which = toy_list;
136 toy_exec(toys.argv+1);
137 if (toys.argv[1][0] == '-') goto list;
139 error_exit("Unknown command %s",toys.argv[1]);
143 // Output list of command.
144 for (i=1; i<ARRAY_LEN(toy_list); i++) {
145 int fl = toy_list[i].flags;
146 if (fl & TOYMASK_LOCATION) {
149 for (j=0; toy_paths[j]; j++)
150 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
152 len += printf("%s ",toy_list[i].name);
162 int main(int argc, char *argv[])
164 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "");
166 toys.toycount = ARRAY_LEN(toy_list);
169 // Trim path off of command name
170 *argv = basename(*argv);
172 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
173 // (It will adjust it back before calling toy_exec().)
177 // a single toybox command built standalone with no multiplexer
178 toy_singleinit(toy_list, argv);
179 toy_list->toy_main();
180 if (fflush(NULL) || ferror(stdout)) perror_exit("write");