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 79 int rootpid; 80 int rootshell; 81 struct jmploc main_handler; 82 int localeisutf8, initial_localeisutf8; 83 84 static void reset(void); 85 static void cmdloop(int); 86 static void read_profile(const char *); 87 static char *find_dot_file(char *); 88 89 /* 90 * Main routine. We initialize things, parse the arguments, execute 91 * profiles if we're a login shell, and then call cmdloop to execute 92 * commands. The setjmp call sets up the location to jump to when an 93 * exception occurs. When an exception occurs the variable "state" 94 * is used to figure out how far we had gotten. 95 */ 96 97 int 98 main(int argc, char *argv[]) 99 { 100 struct stackmark smark, smark2; 101 volatile int state; 102 char *shinit; 103 104 (void) setlocale(LC_ALL, ""); 105 initcharset(); 106 state = 0; 107 if (setjmp(main_handler.loc)) { 108 switch (exception) { 109 case EXEXEC: 110 exitstatus = exerrno; 111 break; 112 113 case EXERROR: 114 exitstatus = 2; 115 break; 116 117 default: 118 break; 119 } 120 121 if (state == 0 || iflag == 0 || ! rootshell || 122 exception == EXEXIT) 123 exitshell(exitstatus); 124 reset(); 125 if (exception == EXINT) 126 out2fmt_flush("\n"); 127 popstackmark(&smark); 128 FORCEINTON; /* enable interrupts */ 129 if (state == 1) 130 goto state1; 131 else if (state == 2) 132 goto state2; 133 else if (state == 3) 134 goto state3; 135 else 136 goto state4; 137 } 138 handler = &main_handler; 139 #ifdef DEBUG 140 opentrace(); 141 trputs("Shell args: "); trargs(argv); 142 #endif 143 rootpid = getpid(); 144 rootshell = 1; 145 INTOFF; 146 initvar(); 147 setstackmark(&smark); 148 setstackmark(&smark2); 149 procargs(argc, argv); 150 pwd_init(iflag); 151 INTON; 152 if (iflag) 153 chkmail(1); 154 if (argv[0] && argv[0][0] == '-') { 155 state = 1; 156 read_profile("/etc/profile"); 157 state1: 158 state = 2; 159 if (privileged == 0) 160 read_profile("${HOME-}/.profile"); 161 else 162 read_profile("/etc/suid_profile"); 163 } 164 state2: 165 state = 3; 166 if (!privileged && iflag) { 167 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 168 state = 3; 169 read_profile(shinit); 170 } 171 } 172 state3: 173 state = 4; 174 popstackmark(&smark2); 175 if (minusc) { 176 evalstring(minusc, sflag ? 0 : EV_EXIT); 177 } 178 state4: 179 if (sflag || minusc == NULL) { 180 cmdloop(1); 181 } 182 exitshell(exitstatus); 183 /*NOTREACHED*/ 184 return 0; 185 } 186 187 static void 188 reset(void) 189 { 190 reseteval(); 191 resetinput(); 192 } 193 194 /* 195 * Read and execute commands. "Top" is nonzero for the top level command 196 * loop; it turns on prompting if the shell is interactive. 197 */ 198 199 static void 200 cmdloop(int top) 201 { 202 union node *n; 203 struct stackmark smark; 204 int inter; 205 int numeof = 0; 206 207 TRACE(("cmdloop(%d) called\n", top)); 208 setstackmark(&smark); 209 for (;;) { 210 if (pendingsig) 211 dotrap(); 212 inter = 0; 213 if (iflag && top) { 214 inter++; 215 showjobs(1, SHOWJOBS_DEFAULT); 216 chkmail(0); 217 flushout(&output); 218 } 219 n = parsecmd(inter); 220 /* showtree(n); DEBUG */ 221 if (n == NEOF) { 222 if (!top || numeof >= 50) 223 break; 224 if (!stoppedjobs()) { 225 if (!Iflag) 226 break; 227 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 228 } 229 numeof++; 230 } else if (n != NULL && nflag == 0) { 231 job_warning = (job_warning == 2) ? 1 : 0; 232 numeof = 0; 233 evaltree(n, 0); 234 } 235 popstackmark(&smark); 236 setstackmark(&smark); 237 if (evalskip != 0) { 238 if (evalskip == SKIPRETURN) 239 evalskip = 0; 240 break; 241 } 242 } 243 popstackmark(&smark); 244 } 245 246 247 248 /* 249 * Read /etc/profile or .profile. Return on error. 250 */ 251 252 static void 253 read_profile(const char *name) 254 { 255 int fd; 256 const char *expandedname; 257 258 expandedname = expandstr(name); 259 if (expandedname == NULL) 260 return; 261 INTOFF; 262 if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC)) >= 0) 263 setinputfd(fd, 1); 264 INTON; 265 if (fd < 0) 266 return; 267 cmdloop(0); 268 popfile(); 269 } 270 271 272 273 /* 274 * Read a file containing shell functions. 275 */ 276 277 void 278 readcmdfile(const char *name) 279 { 280 setinputfile(name, 1); 281 cmdloop(0); 282 popfile(); 283 } 284 285 286 287 /* 288 * Take commands from a file. To be compatible we should do a path 289 * search for the file, which is necessary to find sub-commands. 290 */ 291 292 293 static char * 294 find_dot_file(char *basename) 295 { 296 char *fullname; 297 const char *opt; 298 const char *path = pathval(); 299 struct stat statb; 300 301 /* don't try this for absolute or relative paths */ 302 if( strchr(basename, '/')) 303 return basename; 304 305 while ((fullname = padvance(&path, &opt, basename)) != NULL) { 306 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 307 /* 308 * Don't bother freeing here, since it will 309 * be freed by the caller. 310 */ 311 return fullname; 312 } 313 stunalloc(fullname); 314 } 315 return basename; 316 } 317 318 int 319 dotcmd(int argc, char **argv) 320 { 321 char *filename, *fullname; 322 323 if (argc < 2) 324 error("missing filename"); 325 326 exitstatus = 0; 327 328 /* 329 * Because we have historically not supported any options, 330 * only treat "--" specially. 331 */ 332 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 333 334 fullname = find_dot_file(filename); 335 setinputfile(fullname, 1); 336 commandname = fullname; 337 cmdloop(0); 338 popfile(); 339 return exitstatus; 340 } 341 342 343 int 344 exitcmd(int argc, char **argv) 345 { 346 if (stoppedjobs()) 347 return 0; 348 if (argc > 1) 349 exitshell(number(argv[1])); 350 else 351 exitshell_savedstatus(); 352 } 353