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 trap_init(); 138 pwd_init(iflag); 139 INTON; 140 if (iflag) 141 chkmail(1); 142 if (argv[0] && argv[0][0] == '-') { 143 state = 1; 144 read_profile("/etc/profile"); 145 state1: 146 state = 2; 147 if (privileged == 0) 148 read_profile("${HOME-}/.profile"); 149 else 150 read_profile("/etc/suid_profile"); 151 } 152 state2: 153 state = 3; 154 if (!privileged && iflag) { 155 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 156 state = 3; 157 read_profile(shinit); 158 } 159 } 160 state3: 161 state = 4; 162 popstackmark(&smark2); 163 if (minusc) { 164 evalstring(minusc, sflag ? 0 : EV_EXIT); 165 } 166 state4: 167 if (sflag || minusc == NULL) { 168 cmdloop(1); 169 } 170 exitshell(exitstatus); 171 /*NOTREACHED*/ 172 return 0; 173 } 174 175 static void 176 reset(void) 177 { 178 reseteval(); 179 resetinput(); 180 } 181 182 /* 183 * Read and execute commands. "Top" is nonzero for the top level command 184 * loop; it turns on prompting if the shell is interactive. 185 */ 186 187 static void 188 cmdloop(int top) 189 { 190 union node *n; 191 struct stackmark smark; 192 int inter; 193 int numeof = 0; 194 195 TRACE(("cmdloop(%d) called\n", top)); 196 setstackmark(&smark); 197 for (;;) { 198 if (pendingsig) 199 dotrap(); 200 inter = 0; 201 if (iflag && top) { 202 inter++; 203 showjobs(1, SHOWJOBS_DEFAULT); 204 chkmail(0); 205 flushout(&output); 206 } 207 n = parsecmd(inter); 208 /* showtree(n); DEBUG */ 209 if (n == NEOF) { 210 if (!top || numeof >= 50) 211 break; 212 if (!stoppedjobs()) { 213 if (!Iflag) 214 break; 215 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 216 } 217 numeof++; 218 } else if (n != NULL && nflag == 0) { 219 job_warning = (job_warning == 2) ? 1 : 0; 220 numeof = 0; 221 evaltree(n, 0); 222 } 223 popstackmark(&smark); 224 setstackmark(&smark); 225 if (evalskip != 0) { 226 if (evalskip == SKIPRETURN) 227 evalskip = 0; 228 break; 229 } 230 } 231 popstackmark(&smark); 232 if (top && iflag) { 233 out2c('\n'); 234 flushout(out2); 235 } 236 } 237 238 239 240 /* 241 * Read /etc/profile or .profile. Return on error. 242 */ 243 244 static void 245 read_profile(const char *name) 246 { 247 int fd; 248 const char *expandedname; 249 250 expandedname = expandstr(name); 251 if (expandedname == NULL) 252 return; 253 INTOFF; 254 if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC)) >= 0) 255 setinputfd(fd, 1); 256 INTON; 257 if (fd < 0) 258 return; 259 cmdloop(0); 260 popfile(); 261 } 262 263 264 265 /* 266 * Read a file containing shell functions. 267 */ 268 269 void 270 readcmdfile(const char *name) 271 { 272 setinputfile(name, 1); 273 cmdloop(0); 274 popfile(); 275 } 276 277 278 279 /* 280 * Take commands from a file. To be compatible we should do a path 281 * search for the file, which is necessary to find sub-commands. 282 */ 283 284 285 static char * 286 find_dot_file(char *basename) 287 { 288 char *fullname; 289 const char *opt; 290 const char *path = pathval(); 291 struct stat statb; 292 293 /* don't try this for absolute or relative paths */ 294 if( strchr(basename, '/')) 295 return basename; 296 297 while ((fullname = padvance(&path, &opt, basename)) != NULL) { 298 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { 299 /* 300 * Don't bother freeing here, since it will 301 * be freed by the caller. 302 */ 303 return fullname; 304 } 305 stunalloc(fullname); 306 } 307 return basename; 308 } 309 310 int 311 dotcmd(int argc, char **argv) 312 { 313 char *filename, *fullname; 314 315 if (argc < 2) 316 error("missing filename"); 317 318 exitstatus = 0; 319 320 /* 321 * Because we have historically not supported any options, 322 * only treat "--" specially. 323 */ 324 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 325 326 fullname = find_dot_file(filename); 327 setinputfile(fullname, 1); 328 commandname = fullname; 329 cmdloop(0); 330 popfile(); 331 return exitstatus; 332 } 333 334 335 int 336 exitcmd(int argc, char **argv) 337 { 338 if (stoppedjobs()) 339 return 0; 340 if (argc > 1) 341 exitshell(number(argv[1])); 342 else 343 exitshell_savedstatus(); 344 } 345