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