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