landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 1 | /* Toybox infrastructure. |
| 2 | * |
| 3 | * Copyright 2006 Rob Landley <rob@landley.net> |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 4 | */ |
| 5 | |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 6 | #include "toys.h" |
| 7 | |
Rob Landley | 90afbad | 2015-04-17 02:46:11 -0500 | [diff] [blame] | 8 | #ifndef TOYBOX_VERSION |
Paul Barker | 8387fcb | 2016-06-04 15:05:49 +0100 | [diff] [blame] | 9 | #define TOYBOX_VERSION "0.7.1" |
Rob Landley | 90afbad | 2015-04-17 02:46:11 -0500 | [diff] [blame] | 10 | #endif |
Rob Landley | ad602aa | 2015-04-05 19:23:36 -0500 | [diff] [blame] | 11 | |
Rob Landley | f2311a4 | 2006-11-04 17:45:18 -0500 | [diff] [blame] | 12 | // Populate toy_list[]. |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 13 | |
Rob Landley | a6d696b | 2007-01-31 13:31:19 -0500 | [diff] [blame] | 14 | #undef NEWTOY |
| 15 | #undef OLDTOY |
Rob Landley | ec0b482 | 2016-06-30 20:41:07 -0500 | [diff] [blame] | 16 | #define NEWTOY(name, opts, flags) {#name, name##_main, OPTSTR_##name, flags}, |
Rob Landley | f3e56f4 | 2014-12-31 21:30:59 -0600 | [diff] [blame] | 17 | #define OLDTOY(name, oldname, flags) \ |
| 18 | {#name, oldname##_main, OPTSTR_##oldname, flags}, |
Rob Landley | a6d696b | 2007-01-31 13:31:19 -0500 | [diff] [blame] | 19 | |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 20 | struct toy_list toy_list[] = { |
Rob Landley | 55928b1 | 2008-01-19 17:43:27 -0600 | [diff] [blame] | 21 | #include "generated/newtoys.h" |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 22 | }; |
| 23 | |
Rob Landley | 933919c | 2013-04-21 12:15:59 -0500 | [diff] [blame] | 24 | // global context for this command. |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 25 | |
| 26 | struct toy_context toys; |
Rob Landley | b1aaba1 | 2008-01-20 17:25:44 -0600 | [diff] [blame] | 27 | union global_union this; |
Rob Landley | 8fdcfdb | 2013-09-03 17:56:28 -0500 | [diff] [blame] | 28 | char toybuf[4096], libbuf[4096]; |
landley | c562150 | 2006-09-28 17:18:51 -0400 | [diff] [blame] | 29 | |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 30 | struct toy_list *toy_find(char *name) |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 31 | { |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 32 | int top, bottom, middle; |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 33 | |
Rob Landley | dc1af18 | 2014-09-27 19:58:18 -0500 | [diff] [blame] | 34 | if (!CFG_TOYBOX) return 0; |
| 35 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 36 | // If the name starts with "toybox" accept that as a match. Otherwise |
| 37 | // skip the first entry, which is out of order. |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 38 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 39 | if (!strncmp(name,"toybox",6)) return toy_list; |
| 40 | bottom = 1; |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 41 | |
Rob Landley | 933919c | 2013-04-21 12:15:59 -0500 | [diff] [blame] | 42 | // Binary search to find this command. |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 43 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 44 | top = ARRAY_LEN(toy_list)-1; |
| 45 | for (;;) { |
| 46 | int result; |
Rob Landley | 2c22685 | 2007-11-15 18:30:30 -0600 | [diff] [blame] | 47 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 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; |
| 54 | } |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 55 | } |
| 56 | |
Rob Landley | fc2224b | 2007-06-01 14:31:45 -0400 | [diff] [blame] | 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 |
Rob Landley | 8f8c504 | 2012-01-14 23:28:15 -0600 | [diff] [blame] | 59 | // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize |
| 60 | // stuff out via dead code elimination. |
Rob Landley | fc2224b | 2007-06-01 14:31:45 -0400 | [diff] [blame] | 61 | |
| 62 | #undef NEWTOY |
| 63 | #undef OLDTOY |
| 64 | #define NEWTOY(name, opts, flags) opts || |
Rob Landley | f3e56f4 | 2014-12-31 21:30:59 -0600 | [diff] [blame] | 65 | #define OLDTOY(name, oldname, flags) OPTSTR_##oldname || |
Rob Landley | 4307a7b | 2007-06-07 15:20:26 -0400 | [diff] [blame] | 66 | static const int NEED_OPTIONS = |
Rob Landley | 55928b1 | 2008-01-19 17:43:27 -0600 | [diff] [blame] | 67 | #include "generated/newtoys.h" |
Rob Landley | fc2224b | 2007-06-01 14:31:45 -0400 | [diff] [blame] | 68 | 0; // Ends the opts || opts || opts... |
| 69 | |
Rob Landley | 29e75d5 | 2016-10-01 15:52:00 -0500 | [diff] [blame] | 70 | static void unknown(char *name) |
| 71 | { |
| 72 | toys.exitval = 127; |
Rob Landley | b257479 | 2016-10-17 18:32:35 -0500 | [diff] [blame] | 73 | toys.which = toy_list; |
Rob Landley | 29e75d5 | 2016-10-01 15:52:00 -0500 | [diff] [blame] | 74 | error_exit("Unknown command %s", name); |
| 75 | } |
| 76 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 77 | // Setup toybox global state for this command. |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 78 | static void toy_singleinit(struct toy_list *which, char *argv[]) |
| 79 | { |
| 80 | toys.which = which; |
| 81 | toys.argv = argv; |
| 82 | |
Rob Landley | 9b14cb6b | 2014-09-20 17:51:23 -0500 | [diff] [blame] | 83 | if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "C"+!!(which->flags & TOYFLAG_LOCALE)); |
Rob Landley | fc49761 | 2014-06-21 13:03:42 -0500 | [diff] [blame] | 84 | |
Rob Landley | 29e75d5 | 2016-10-01 15:52:00 -0500 | [diff] [blame] | 85 | // Parse --help and --version for (almost) all commands |
| 86 | if (CFG_TOYBOX_HELP_DASHDASH && !(which->flags & TOYFLAG_NOHELP) && argv[1]) { |
| 87 | if (!strcmp(argv[1], "--help")) { |
| 88 | if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2]) |
| 89 | if (!(toys.which = toy_find(toys.argv[2]))) unknown(toys.argv[2]); |
| 90 | show_help(stdout); |
| 91 | xexit(); |
| 92 | } |
| 93 | |
| 94 | if (!strcmp(argv[1], "--version")) { |
| 95 | xputs("toybox "TOYBOX_VERSION); |
| 96 | xexit(); |
| 97 | } |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | if (NEED_OPTIONS && which->options) get_optflags(); |
| 101 | else { |
| 102 | toys.optargs = argv+1; |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 103 | for (toys.optc = 0; toys.optargs[toys.optc]; toys.optc++); |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 104 | } |
| 105 | toys.old_umask = umask(0); |
| 106 | if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask); |
Rob Landley | 1bc5224 | 2014-05-21 07:24:16 -0500 | [diff] [blame] | 107 | toys.signalfd--; |
Rob Landley | 90b200c | 2014-06-11 22:13:28 -0500 | [diff] [blame] | 108 | toys.toycount = ARRAY_LEN(toy_list); |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 109 | } |
| 110 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 111 | // Full init needed by multiplexer or reentrant calls, calls singleinit at end |
landley | cd9dfc3 | 2006-10-18 18:38:16 -0400 | [diff] [blame] | 112 | void toy_init(struct toy_list *which, char *argv[]) |
| 113 | { |
Rob Landley | ca311f1 | 2016-01-30 16:28:13 -0600 | [diff] [blame] | 114 | void *oldwhich = toys.which; |
| 115 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 116 | // Drop permissions for non-suid commands. |
Rob Landley | e0377fb | 2010-01-05 12:17:05 -0600 | [diff] [blame] | 117 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 118 | if (CFG_TOYBOX_SUID) { |
Rob Landley | ca311f1 | 2016-01-30 16:28:13 -0600 | [diff] [blame] | 119 | if (!toys.which) toys.which = toy_list; |
| 120 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 121 | uid_t uid = getuid(), euid = geteuid(); |
Rob Landley | e0377fb | 2010-01-05 12:17:05 -0600 | [diff] [blame] | 122 | |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 123 | if (!(which->flags & TOYFLAG_STAYROOT)) { |
Rob Landley | 5c87c14 | 2014-08-31 11:58:39 -0500 | [diff] [blame] | 124 | if (uid != euid) { |
Patrick Ohly | 62b53ed | 2016-02-09 16:43:35 +0100 | [diff] [blame] | 125 | if (setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root |
Rob Landley | ca311f1 | 2016-01-30 16:28:13 -0600 | [diff] [blame] | 126 | euid = uid; |
| 127 | toys.wasroot++; |
Rob Landley | 5c87c14 | 2014-08-31 11:58:39 -0500 | [diff] [blame] | 128 | } |
Rob Landley | bf1e70f | 2012-12-27 17:09:17 -0600 | [diff] [blame] | 129 | } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list) |
| 130 | error_msg("Not installed suid root"); |
Rob Landley | e0377fb | 2010-01-05 12:17:05 -0600 | [diff] [blame] | 131 | |
Rob Landley | e5354ca | 2015-09-11 16:35:14 -0500 | [diff] [blame] | 132 | if ((which->flags & TOYFLAG_NEEDROOT) && euid) help_exit("Not root"); |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 133 | } |
Rob Landley | e0377fb | 2010-01-05 12:17:05 -0600 | [diff] [blame] | 134 | |
Rob Landley | caf39c2 | 2012-11-16 00:35:46 -0600 | [diff] [blame] | 135 | // Free old toys contents (to be reentrant), but leave rebound if any |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 136 | // don't blank old optargs if our new argc lives in the old optargs. |
| 137 | if (argv<toys.optargs || argv>toys.optargs+toys.optc) free(toys.optargs); |
Rob Landley | caf39c2 | 2012-11-16 00:35:46 -0600 | [diff] [blame] | 138 | memset(&toys, 0, offsetof(struct toy_context, rebound)); |
Rob Landley | ca311f1 | 2016-01-30 16:28:13 -0600 | [diff] [blame] | 139 | if (oldwhich) memset(&this, 0, sizeof(this)); |
landley | cd9dfc3 | 2006-10-18 18:38:16 -0400 | [diff] [blame] | 140 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 141 | // Continue to portion of init needed by standalone commands |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 142 | toy_singleinit(which, argv); |
landley | cd9dfc3 | 2006-10-18 18:38:16 -0400 | [diff] [blame] | 143 | } |
| 144 | |
Rob Landley | 8f8c504 | 2012-01-14 23:28:15 -0600 | [diff] [blame] | 145 | // Like exec() but runs an internal toybox command instead of another file. |
Rob Landley | c6705af | 2014-09-09 23:42:25 -0500 | [diff] [blame] | 146 | // Only returns if it can't run command internally, otherwise exit() when done. |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 147 | void toy_exec(char *argv[]) |
| 148 | { |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 149 | struct toy_list *which; |
Rob Landley | b841cd2 | 2007-06-01 13:41:24 -0400 | [diff] [blame] | 150 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 151 | // Return if we can't find it (which includes no multiplexer case), |
| 152 | if (!(which = toy_find(*argv))) return; |
Rob Landley | c6705af | 2014-09-09 23:42:25 -0500 | [diff] [blame] | 153 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 154 | // Return if stack depth getting noticeable (proxy for leaked heap, etc). |
Rob Landley | 869da8c | 2016-05-07 00:21:34 -0500 | [diff] [blame] | 155 | |
| 156 | // Compiler writers have decided subtracting char * is undefined behavior, |
| 157 | // so convert to integers. (LP64 says sizeof(long)==sizeof(pointer).) |
Rob Landley | 4e756d7 | 2016-05-10 03:26:02 -0500 | [diff] [blame] | 158 | if (!CFG_TOYBOX_NORECURSE) |
| 159 | if (toys.stacktop && labs((long)toys.stacktop-(long)&which)>6000) return; |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 160 | |
| 161 | // Return if we need to re-exec to acquire root via suid bit. |
Rob Landley | ca311f1 | 2016-01-30 16:28:13 -0600 | [diff] [blame] | 162 | if (toys.which && (which->flags&TOYFLAG_ROOTONLY) && toys.wasroot) return; |
Rob Landley | 7c5ed1c | 2015-02-15 15:27:43 -0600 | [diff] [blame] | 163 | |
Rob Landley | c6705af | 2014-09-09 23:42:25 -0500 | [diff] [blame] | 164 | // Run command |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 165 | toy_init(which, argv); |
Rob Landley | 5f80533 | 2013-08-21 03:03:47 -0500 | [diff] [blame] | 166 | if (toys.which) toys.which->toy_main(); |
Rob Landley | 953722e | 2013-06-30 15:58:24 -0500 | [diff] [blame] | 167 | xexit(); |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 168 | } |
| 169 | |
Rob Landley | 8f8c504 | 2012-01-14 23:28:15 -0600 | [diff] [blame] | 170 | // Multiplexer command, first argument is command to run, rest are args to that. |
| 171 | // If first argument starts with - output list of command install paths. |
Rob Landley | efda21c | 2007-11-29 18:14:37 -0600 | [diff] [blame] | 172 | void toybox_main(void) |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 173 | { |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 174 | static char *toy_paths[]={"usr/","bin/","sbin/",0}; |
| 175 | int i, len = 0; |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 176 | |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 177 | // fast path: try to exec immediately. |
| 178 | // (Leave toys.which null to disable suid return logic.) |
| 179 | if (toys.argv[1]) toy_exec(toys.argv+1); |
| 180 | |
| 181 | // For early error reporting |
Rob Landley | 6c62448 | 2012-11-18 18:52:19 -0600 | [diff] [blame] | 182 | toys.which = toy_list; |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 183 | |
Rob Landley | 29e75d5 | 2016-10-01 15:52:00 -0500 | [diff] [blame] | 184 | if (toys.argv[1] && toys.argv[1][0] != '-') unknown(toys.argv[1]); |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 185 | |
Rob Landley | 933919c | 2013-04-21 12:15:59 -0500 | [diff] [blame] | 186 | // Output list of command. |
Rob Landley | e7acb47 | 2015-04-07 11:54:36 -0500 | [diff] [blame] | 187 | for (i=1; i<ARRAY_LEN(toy_list); i++) { |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 188 | int fl = toy_list[i].flags; |
| 189 | if (fl & TOYMASK_LOCATION) { |
| 190 | if (toys.argv[1]) { |
| 191 | int j; |
| 192 | for (j=0; toy_paths[j]; j++) |
| 193 | if (fl & (1<<j)) len += printf("%s", toy_paths[j]); |
| 194 | } |
Rob Landley | d3f335d | 2014-10-26 12:56:41 -0500 | [diff] [blame] | 195 | len += printf("%s",toy_list[i].name); |
| 196 | if (++len > 65) len = 0; |
| 197 | xputc(len ? ' ' : '\n'); |
Rob Landley | 7aa651a | 2012-11-13 17:14:08 -0600 | [diff] [blame] | 198 | } |
| 199 | } |
| 200 | xputc('\n'); |
landley | 4f344e3 | 2006-10-05 16:18:03 -0400 | [diff] [blame] | 201 | } |
| 202 | |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 203 | int main(int argc, char *argv[]) |
| 204 | { |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 205 | if (!*argv) return 127; |
| 206 | |
| 207 | // Snapshot stack location so we can detect recursion depth later. |
| 208 | // This is its own block so probe doesn't permanently consume stack. |
| 209 | else { |
| 210 | int stack; |
| 211 | |
| 212 | toys.stacktop = &stack; |
| 213 | } |
Rob Landley | cb49c30 | 2016-04-10 14:35:51 -0500 | [diff] [blame] | 214 | *argv = getbasename(*argv); |
Rob Landley | 3b51a07 | 2015-09-27 09:03:41 -0500 | [diff] [blame] | 215 | |
| 216 | // If nommu can't fork, special reentry path. |
| 217 | // Use !stacktop to signal "vfork happened", both before and after xexec() |
| 218 | if (!CFG_TOYBOX_FORK) { |
| 219 | if (0x80 & **argv) { |
| 220 | **argv &= 0x7f; |
| 221 | toys.stacktop = 0; |
| 222 | } |
| 223 | } |
Rob Landley | e7c0954 | 2015-04-30 15:11:34 -0500 | [diff] [blame] | 224 | |
Rob Landley | d04dc1f | 2013-08-30 01:53:31 -0500 | [diff] [blame] | 225 | if (CFG_TOYBOX) { |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 226 | // Call the multiplexer, adjusting this argv[] to be its' argv[1]. |
| 227 | // (It will adjust it back before calling toy_exec().) |
| 228 | toys.argv = argv-1; |
| 229 | toybox_main(); |
| 230 | } else { |
| 231 | // a single toybox command built standalone with no multiplexer |
| 232 | toy_singleinit(toy_list, argv); |
| 233 | toy_list->toy_main(); |
Rob Landley | bb504f3 | 2013-07-19 02:03:02 -0500 | [diff] [blame] | 234 | } |
| 235 | |
Rob Landley | aad492f | 2015-01-03 16:25:36 -0600 | [diff] [blame] | 236 | xexit(); |
landley | 13bab2f | 2006-09-27 00:45:05 -0400 | [diff] [blame] | 237 | } |