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 * 4. 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 "init.h" 72 #include "mystring.h" 73 #include "exec.h" 74 #include "cd.h" 75 76 int rootpid; 77 int rootshell; 78 struct jmploc main_handler; 79 80 static void read_profile(const char *); 81 static char *find_dot_file(char *); 82 83 /* 84 * Main routine. We initialize things, parse the arguments, execute 85 * profiles if we're a login shell, and then call cmdloop to execute 86 * commands. The setjmp call sets up the location to jump to when an 87 * exception occurs. When an exception occurs the variable "state" 88 * is used to figure out how far we had gotten. 89 */ 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct stackmark smark; 95 volatile int state; 96 char *shinit; 97 98 (void) setlocale(LC_ALL, ""); 99 state = 0; 100 if (setjmp(main_handler.loc)) { 101 switch (exception) { 102 case EXEXEC: 103 exitstatus = exerrno; 104 break; 105 106 case EXERROR: 107 exitstatus = 2; 108 break; 109 110 default: 111 break; 112 } 113 114 if (state == 0 || iflag == 0 || ! rootshell || 115 exception == EXEXIT) 116 exitshell(exitstatus); 117 reset(); 118 if (exception == EXINT) 119 out2fmt_flush("\n"); 120 popstackmark(&smark); 121 FORCEINTON; /* enable interrupts */ 122 if (state == 1) 123 goto state1; 124 else if (state == 2) 125 goto state2; 126 else if (state == 3) 127 goto state3; 128 else 129 goto state4; 130 } 131 handler = &main_handler; 132 #ifdef DEBUG 133 opentrace(); 134 trputs("Shell args: "); trargs(argv); 135 #endif 136 rootpid = getpid(); 137 rootshell = 1; 138 init(); 139 setstackmark(&smark); 140 procargs(argc, argv); 141 pwd_init(iflag); 142 if (iflag) 143 chkmail(1); 144 if (argv[0] && argv[0][0] == '-') { 145 state = 1; 146 read_profile("/etc/profile"); 147 state1: 148 state = 2; 149 if (privileged == 0) 150 read_profile(".profile"); 151 else 152 read_profile("/etc/suid_profile"); 153 } 154 state2: 155 state = 3; 156 if (!privileged && iflag) { 157 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { 158 state = 3; 159 read_profile(shinit); 160 } 161 } 162 state3: 163 state = 4; 164 if (minusc) { 165 evalstring(minusc, sflag ? 0 : EV_EXIT); 166 } 167 if (sflag || minusc == NULL) { 168 state4: /* XXX ??? - why isn't this before the "if" statement */ 169 cmdloop(1); 170 } 171 exitshell(exitstatus); 172 /*NOTREACHED*/ 173 return 0; 174 } 175 176 177 /* 178 * Read and execute commands. "Top" is nonzero for the top level command 179 * loop; it turns on prompting if the shell is interactive. 180 */ 181 182 void 183 cmdloop(int top) 184 { 185 union node *n; 186 struct stackmark smark; 187 int inter; 188 int numeof = 0; 189 190 TRACE(("cmdloop(%d) called\n", top)); 191 setstackmark(&smark); 192 for (;;) { 193 if (pendingsigs) 194 dotrap(); 195 inter = 0; 196 if (iflag && top) { 197 inter++; 198 showjobs(1, SHOWJOBS_DEFAULT); 199 chkmail(0); 200 flushout(&output); 201 } 202 n = parsecmd(inter); 203 /* showtree(n); DEBUG */ 204 if (n == NEOF) { 205 if (!top || numeof >= 50) 206 break; 207 if (!stoppedjobs()) { 208 if (!Iflag) 209 break; 210 out2fmt_flush("\nUse \"exit\" to leave shell.\n"); 211 } 212 numeof++; 213 } else if (n != NULL && nflag == 0) { 214 job_warning = (job_warning == 2) ? 1 : 0; 215 numeof = 0; 216 evaltree(n, 0); 217 } 218 popstackmark(&smark); 219 setstackmark(&smark); 220 if (evalskip != 0) { 221 if (evalskip == SKIPFILE) 222 evalskip = 0; 223 break; 224 } 225 } 226 popstackmark(&smark); 227 } 228 229 230 231 /* 232 * Read /etc/profile or .profile. Return on error. 233 */ 234 235 static void 236 read_profile(const char *name) 237 { 238 int fd; 239 240 INTOFF; 241 if ((fd = open(name, O_RDONLY)) >= 0) 242 setinputfd(fd, 1); 243 INTON; 244 if (fd < 0) 245 return; 246 cmdloop(0); 247 popfile(); 248 } 249 250 251 252 /* 253 * Read a file containing shell functions. 254 */ 255 256 void 257 readcmdfile(const char *name) 258 { 259 int fd; 260 261 INTOFF; 262 if ((fd = open(name, O_RDONLY)) >= 0) 263 setinputfd(fd, 1); 264 else 265 error("Can't open %s: %s", name, strerror(errno)); 266 INTON; 267 cmdloop(0); 268 popfile(); 269 } 270 271 272 273 /* 274 * Take commands from a file. To be compatible we should do a path 275 * search for the file, which is necessary to find sub-commands. 276 */ 277 278 279 static char * 280 find_dot_file(char *basename) 281 { 282 static char localname[FILENAME_MAX+1]; 283 char *fullname; 284 const char *path = pathval(); 285 struct stat statb; 286 287 /* don't try this for absolute or relative paths */ 288 if( strchr(basename, '/')) 289 return basename; 290 291 while ((fullname = padvance(&path, basename)) != NULL) { 292 strcpy(localname, fullname); 293 stunalloc(fullname); 294 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) 295 return localname; 296 } 297 return basename; 298 } 299 300 int 301 dotcmd(int argc, char **argv) 302 { 303 char *filename, *fullname; 304 305 if (argc < 2) 306 error("missing filename"); 307 308 exitstatus = 0; 309 310 /* 311 * Because we have historically not supported any options, 312 * only treat "--" specially. 313 */ 314 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; 315 316 fullname = find_dot_file(filename); 317 setinputfile(fullname, 1); 318 commandname = fullname; 319 cmdloop(0); 320 popfile(); 321 return exitstatus; 322 } 323 324 325 int 326 exitcmd(int argc, char **argv) 327 { 328 if (stoppedjobs()) 329 return 0; 330 if (argc > 1) 331 exitshell(number(argv[1])); 332 else 333 exitshell_savedstatus(); 334 } 335