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