1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static char const copyright[] = 37 "@(#) Copyright (c) 1991, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95"; 44 #endif 45 #endif /* not lint */ 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <stdio.h> 50 #include <signal.h> 51 #include <sys/stat.h> 52 #include <unistd.h> 53 #include <fcntl.h> 54 #include <locale.h> 55 #include <errno.h> 56 57 #include "shell.h" 58 #include "main.h" 59 #include "mail.h" 60 #include "options.h" 61 #include "output.h" 62 #include "parser.h" 63 #include "nodes.h" 64 #include "expand.h" 65 #include "eval.h" 66 #include "jobs.h" 67 #include "input.h" 68 #include "trap.h" 69 #include "var.h" 70 #include "show.h" 71 #include "memalloc.h" 72 #include "error.h" 73 #include "mystring.h" 74 #include "exec.h" 75 #include "cd.h" 76 #include "redir.h" 77 #include "builtins.h" 78 #ifndef NO_HISTORY 79 #include "myhistedit.h" 80 #endif 81 82 int rootpid; 83 int rootshell; 84 struct jmploc main_handler; 85 int localeisutf8, initial_localeisutf8; 86 87 static void reset(void); 88 static void cmdloop(int); 89 static void read_profile(const char *); 90 static char *find_dot_file(char *); 91 92 /* 93 * Main routine. We initialize things, parse the arguments, execute 94 * profiles if we're a login shell, and then call cmdloop to execute 95 * commands. The setjmp call sets up the location to jump to when an 96 * exception occurs. When an exception occurs the variable "state" 97 * is used to figure out how far we had gotten. 98 */ 99 100 int 101 main(int argc, char *argv[]) 102 { 103 struct stackmark smark, smark2; 104 volatile int state; 105 char *shinit; 106 107 (void) setlocale(LC_ALL, ""); 108 initcharset(); 109 state = 0; 110 if (setjmp(main_handler.loc)) { 111 if (state == 0 || iflag == 0 || ! rootshell || 112 exception == EXEXIT) 113 exitshell(exitstatus); 114 reset(); 115 if (exception == EXINT) 116 out2fmt_flush("\n"); 117 popstackmark(&smark); 118 FORCEINTON; /* enable interrupts */ 119 if (state == 1) 120 goto state1; 121 else if (state == 2) 122 goto state2; 123 else if (state == 3) 124 goto state3; 125 else 126 goto state4; 127 } 128 handler = &main_handler; 129 #ifdef DEBUG 130 opentrace(); 131 trputs("Shell args: "); trargs(argv); 132 #endif 133 rootpid = getpid(); 134 rootshell = 1; 135 INTOFF; 136 initvar(); 137 setstackmark(&smark); 138 setstackmark(&smark2); 139 procargs(argc, argv); 140 trap_init(); 141 pwd_init(iflag); 142 INTON; 143 if (iflag) 144 chkmail(1); 145 if (argv[0] && argv[0][0] == '-') { 146 state = 1; 147 read_profile("/etc/profile"); 148 state1: 149 state = 2; 150 if (privileged == 0) 151 read_profile("${HOME-}/.profile"); 152 else 153 read_profile("/etc/suid_profile"); 154 } 155 state2: 156 state = 3; 157 if (!privileged && iflag) { 158 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 159 state = 3; 160 read_profile(shinit); 161 } 162 } 163 #ifndef NO_HISTORY 164 if (iflag) 165 histload(); 166 #endif 167 state3: 168 state = 4; 169 popstackmark(&smark2); 170 if (minusc) { 171 evalstring(minusc, sflag ? 0 : EV_EXIT); 172 } 173 state4: 174 if (sflag || minusc == NULL) { 175 cmdloop(1); 176 } 177 exitshell(exitstatus); 178 /*NOTREACHED*/ 179 return 0; 180 } 181 182 static void 183 reset(void) 184 { 185 reseteval(); 186 resetinput(); 187 } 188 189 /* 190 * Read and execute commands. "Top" is nonzero for the top level command 191 * loop; it turns on prompting if the shell is interactive. 192 */ 193 194 static void 195 cmdloop(int top) 196 { 197 union node *n; 198 struct stackmark smark; 199 int inter; 200 int numeof = 0; 201 202 TRACE(("cmdloop(%d) called\n", top)); 203 setstackmark(&smark); 204 for (;;) { 205 if (pendingsig) 206 dotrap(); 207 inter = 0; 208 if (iflag && top) { 209 inter++; 210 showjobs(1, SHOWJOBS_DEFAULT); 211 chkmail(0); 212 flushout(&output); 213 } 214 n = parsecmd(inter); 215 /* showtree(n); DEBUG */ 216 if (n == NEOF) { 217 if (!top || numeof >= 50) 218 break; 219 if (!stoppedjobs()) { 220 if (!Iflag) 221 break; 222 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 223 } 224 numeof++; 225 } else if (n != NULL && nflag == 0) { 226 job_warning = (job_warning == 2) ? 1 : 0; 227 numeof = 0; 228 evaltree(n, 0); 229 } 230 popstackmark(&smark); 231 setstackmark(&smark); 232 if (evalskip != 0) { 233 if (evalskip == SKIPRETURN) 234 evalskip = 0; 235 break; 236 } 237 } 238 popstackmark(&smark); 239 if (top && iflag) { 240 out2c('\n'); 241 flushout(out2); 242 } 243 } 244 245 246 247 /* 248 * Read /etc/profile or .profile. Return on error. 249 */ 250 251 static void 252 read_profile(const char *name) 253 { 254 int fd; 255 const char *expandedname; 256 int oflags = O_RDONLY | O_CLOEXEC; 257 258 if (verifyflag) 259 oflags |= O_VERIFY; 260 261 expandedname = expandstr(name); 262 if (expandedname == NULL) 263 return; 264 INTOFF; 265 if ((fd = open(expandedname, oflags)) >= 0) 266 setinputfd(fd, 1); 267 INTON; 268 if (fd < 0) 269 return; 270 cmdloop(0); 271 popfile(); 272 } 273 274 275 276 /* 277 * Read a file containing shell functions. 278 */ 279 280 void 281 readcmdfile(const char *name, int verify) 282 { 283 setinputfile(name, 1, verify); 284 cmdloop(0); 285 popfile(); 286 } 287 288 289 290 /* 291 * Take commands from a file. To be compatible we should do a path 292 * search for the file, which is necessary to find sub-commands. 293 */ 294 295 296 static char * 297 find_dot_file(char *basename) 298 { 299 char *fullname; 300 const char *opt; 301 const char *path = pathval(); 302 struct stat statb; 303 304 /* don't try this for absolute or relative paths */ 305 if( strchr(basename, '/')) 306 return basename; 307 308 while ((fullname = padvance(&path, &opt, basename)) != NULL) { 309 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 310 /* 311 * Don't bother freeing here, since it will 312 * be freed by the caller. 313 */ 314 return fullname; 315 } 316 stunalloc(fullname); 317 } 318 return basename; 319 } 320 321 int 322 dotcmd(int argc, char **argv) 323 { 324 char *filename, *fullname; 325 326 if (argc < 2) 327 error("missing filename"); 328 329 exitstatus = 0; 330 331 /* 332 * Because we have historically not supported any options, 333 * only treat "--" specially. 334 */ 335 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 336 337 fullname = find_dot_file(filename); 338 setinputfile(fullname, 1, -1 /* verify */); 339 commandname = fullname; 340 cmdloop(0); 341 popfile(); 342 return exitstatus; 343 } 344 345 346 int 347 exitcmd(int argc, char **argv) 348 { 349 if (stoppedjobs()) 350 return 0; 351 if (argc > 1) 352 exitshell(number(argv[1])); 353 else 354 exitshell_savedstatus(); 355 } 356