1 /* Toybox infrastructure. 2 * 3 * Copyright 2006 Rob Landley <rob (at) landley.net> 4 */ 5 6 #include "toys.h" 7 8 #ifndef TOYBOX_VERSION 9 #define TOYBOX_VERSION "0.5.2" 10 #endif 11 12 // Populate toy_list[]. 13 14 #undef NEWTOY 15 #undef OLDTOY 16 #define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags}, 17 #define OLDTOY(name, oldname, flags) \ 18 {#name, oldname##_main, OPTSTR_##oldname, flags}, 19 20 struct toy_list toy_list[] = { 21 #include "generated/newtoys.h" 22 }; 23 24 // global context for this command. 25 26 struct toy_context toys; 27 union global_union this; 28 char toybuf[4096], libbuf[4096]; 29 30 struct toy_list *toy_find(char *name) 31 { 32 int top, bottom, middle; 33 34 if (!CFG_TOYBOX) return 0; 35 36 // If the name starts with "toybox" accept that as a match. Otherwise 37 // skip the first entry, which is out of order. 38 39 if (!strncmp(name,"toybox",6)) return toy_list; 40 bottom = 1; 41 42 // Binary search to find this command. 43 44 top = ARRAY_LEN(toy_list)-1; 45 for (;;) { 46 int result; 47 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 } 55 } 56 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. 61 62 #undef NEWTOY 63 #undef OLDTOY 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... 69 70 // Subset of init needed by singlemain 71 static void toy_singleinit(struct toy_list *which, char *argv[]) 72 { 73 toys.which = which; 74 toys.argv = argv; 75 76 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "C"+!!(which->flags & TOYFLAG_LOCALE)); 77 78 if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) { 79 if (CFG_TOYBOX && toys.which == toy_list && toys.argv[2]) 80 if (!(toys.which = toy_find(toys.argv[2]))) return; 81 show_help(); 82 xexit(); 83 } 84 85 if (NEED_OPTIONS && which->options) get_optflags(); 86 else { 87 toys.optargs = argv+1; 88 for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++); 89 } 90 toys.old_umask = umask(0); 91 if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask); 92 toys.signalfd--; 93 toys.toycount = ARRAY_LEN(toy_list); 94 } 95 96 // Setup toybox global state for this command. 97 98 void toy_init(struct toy_list *which, char *argv[]) 99 { 100 // Drop permissions for non-suid commands. 101 102 if (CFG_TOYBOX_SUID) { 103 uid_t uid = getuid(), euid = geteuid(); 104 105 if (!(which->flags & TOYFLAG_STAYROOT)) { 106 if (uid != euid) { 107 if (!setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root 108 else euid = uid; 109 } 110 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list) 111 error_msg("Not installed suid root"); 112 113 if ((which->flags & TOYFLAG_NEEDROOT) && euid) { 114 toys.exithelp++; 115 error_exit("Not root"); 116 } 117 } 118 119 // Free old toys contents (to be reentrant), but leave rebound if any 120 121 if (toys.optargs != toys.argv+1) free(toys.optargs); 122 memset(&toys, 0, offsetof(struct toy_context, rebound)); 123 if (toys.recursion > 1) memset(&this, 0, sizeof(this)); 124 125 // Subset of init needed by singlemain. 126 toy_singleinit(which, argv); 127 } 128 129 // Like exec() but runs an internal toybox command instead of another file. 130 // Only returns if it can't run command internally, otherwise exit() when done. 131 void toy_exec(char *argv[]) 132 { 133 struct toy_list *which; 134 135 // Return if we can't find it, or need to re-exec to acquire root, 136 // or if stack depth is getting silly. 137 if (!(which = toy_find(argv[0]))) return; 138 if (toys.recursion && (which->flags & TOYFLAG_ROOTONLY) && getuid()) return; 139 if (toys.recursion++ > 5) return; 140 141 // don't blank old optargs if our new argc lives in the old optargs. 142 if (argv>=toys.optargs && argv<=toys.optargs+toys.optc) toys.optargs = 0; 143 144 // Run command 145 toy_init(which, argv); 146 if (toys.which) toys.which->toy_main(); 147 xexit(); 148 } 149 150 // Multiplexer command, first argument is command to run, rest are args to that. 151 // If first argument starts with - output list of command install paths. 152 153 void toybox_main(void) 154 { 155 static char *toy_paths[]={"usr/","bin/","sbin/",0}; 156 int i, len = 0; 157 158 toys.which = toy_list; 159 if (toys.argv[1]) { 160 toys.optc = toys.recursion = 0; 161 toy_exec(toys.argv+1); 162 if (!strcmp("--version", toys.argv[1])) { 163 xputs(TOYBOX_VERSION); 164 xexit(); 165 } 166 if (toys.argv[1][0] != '-') error_exit("Unknown command %s", toys.argv[1]); 167 } 168 169 // Output list of command. 170 for (i=1; i<ARRAY_LEN(toy_list); i++) { 171 int fl = toy_list[i].flags; 172 if (fl & TOYMASK_LOCATION) { 173 if (toys.argv[1]) { 174 int j; 175 for (j=0; toy_paths[j]; j++) 176 if (fl & (1<<j)) len += printf("%s", toy_paths[j]); 177 } 178 len += printf("%s",toy_list[i].name); 179 if (++len > 65) len = 0; 180 xputc(len ? ' ' : '\n'); 181 } 182 } 183 xputc('\n'); 184 } 185 186 int main(int argc, char *argv[]) 187 { 188 // We check our own stdout errors, disable sigpipe killer 189 signal(SIGPIPE, SIG_IGN); 190 191 if (CFG_TOYBOX) { 192 // Trim path off of command name 193 *argv = basename(*argv); 194 195 // Call the multiplexer, adjusting this argv[] to be its' argv[1]. 196 // (It will adjust it back before calling toy_exec().) 197 toys.argv = argv-1; 198 toybox_main(); 199 } else { 200 // a single toybox command built standalone with no multiplexer 201 toy_singleinit(toy_list, argv); 202 toy_list->toy_main(); 203 } 204 205 xexit(); 206 } 207
