1 /* $OpenBSD: script.c,v 1.21 2004/10/10 03:59:04 mickey Exp $ */ 2 /* $NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 2001 Theo de Raadt 6 * All rights reserved. 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1980, 1992, 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 #ifndef lint 59 static const char copyright[] = 60 "@(#) Copyright (c) 1980, 1992, 1993\n\ 61 The Regents of the University of California. All rights reserved.\n"; 62 #endif /* not lint */ 63 64 #ifndef lint 65 #if 0 66 static const char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; 67 #endif 68 static const char rcsid[] = "$OpenBSD: script.c,v 1.21 2004/10/10 03:59:04 mickey Exp $"; 69 #endif /* not lint */ 70 71 #include <sys/types.h> 72 #include <sys/wait.h> 73 #include <sys/stat.h> 74 #include <sys/ioctl.h> 75 #include <sys/time.h> 76 77 #include <errno.h> 78 #include <fcntl.h> 79 #include <paths.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <termios.h> 85 #include <tzfile.h> 86 #include <unistd.h> 87 88 #include <util.h> 89 #include <err.h> 90 91 FILE *fscript; 92 int master, slave; 93 volatile sig_atomic_t child; 94 pid_t subchild; 95 char *fname; 96 97 volatile sig_atomic_t dead; 98 volatile sig_atomic_t sigdeadstatus; 99 volatile sig_atomic_t flush; 100 101 struct termios tt; 102 103 __dead void done(int); 104 void dooutput(void); 105 void doshell(void); 106 void fail(void); 107 void finish(int); 108 void scriptflush(int); 109 void handlesigwinch(int); 110 111 int 112 main(int argc, char *argv[]) 113 { 114 extern char *__progname; 115 struct sigaction sa; 116 struct termios rtt; 117 struct winsize win; 118 char ibuf[BUFSIZ]; 119 ssize_t cc, off; 120 int aflg, ch; 121 122 aflg = 0; 123 while ((ch = getopt(argc, argv, "a")) != -1) 124 switch(ch) { 125 case 'a': 126 aflg = 1; 127 break; 128 default: 129 fprintf(stderr, "usage: %s [-a] [file]\n", __progname); 130 exit(1); 131 } 132 argc -= optind; 133 argv += optind; 134 135 if (argc > 0) 136 fname = argv[0]; 137 else 138 fname = "typescript"; 139 140 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 141 err(1, "%s", fname); 142 143 (void)tcgetattr(STDIN_FILENO, &tt); 144 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 145 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 146 err(1, "openpty"); 147 148 (void)printf("Script started, output file is %s\n", fname); 149 rtt = tt; 150 cfmakeraw(&rtt); 151 rtt.c_lflag &= ~ECHO; 152 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 153 154 bzero(&sa, sizeof sa); 155 sigemptyset(&sa.sa_mask); 156 sa.sa_handler = finish; 157 (void)sigaction(SIGCHLD, &sa, NULL); 158 159 sa.sa_handler = handlesigwinch; 160 sa.sa_flags = SA_RESTART; 161 (void)sigaction(SIGWINCH, &sa, NULL); 162 163 child = fork(); 164 if (child < 0) { 165 warn("fork"); 166 fail(); 167 } 168 if (child == 0) { 169 subchild = child = fork(); 170 if (child < 0) { 171 warn("fork"); 172 fail(); 173 } 174 if (child) 175 dooutput(); 176 else 177 doshell(); 178 } 179 180 (void)fclose(fscript); 181 while (1) { 182 if (dead) 183 break; 184 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 185 if (cc == -1 && errno == EINTR) 186 continue; 187 if (cc <= 0) 188 break; 189 for (off = 0; off < cc; ) { 190 ssize_t n = write(master, ibuf + off, cc - off); 191 if (n == 0) 192 break; /* skip writing */ 193 if (n > 0) 194 off += n; 195 } 196 } 197 done(sigdeadstatus); 198 } 199 200 /* ARGSUSED */ 201 void 202 finish(int signo) 203 { 204 int save_errno = errno; 205 int status, e = 1; 206 pid_t pid; 207 208 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 209 if (pid == (pid_t)child) { 210 if (WIFEXITED(status)) 211 e = WEXITSTATUS(status); 212 } 213 } 214 dead = 1; 215 sigdeadstatus = e; 216 errno = save_errno; 217 } 218 219 /* ARGSUSED */ 220 void 221 handlesigwinch(int signo) 222 { 223 int save_errno = errno; 224 struct winsize win; 225 pid_t pgrp; 226 227 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 228 ioctl(slave, TIOCSWINSZ, &win); 229 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 230 killpg(pgrp, SIGWINCH); 231 } 232 errno = save_errno; 233 } 234 235 void 236 dooutput(void) 237 { 238 struct sigaction sa; 239 struct itimerval value; 240 char obuf[BUFSIZ]; 241 time_t tvec; 242 ssize_t outcc = 0, cc, off; 243 244 (void)close(STDIN_FILENO); 245 tvec = time(NULL); 246 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 247 248 bzero(&sa, sizeof sa); 249 sigemptyset(&sa.sa_mask); 250 sa.sa_handler = scriptflush; 251 (void)sigaction(SIGALRM, &sa, NULL); 252 253 value.it_interval.tv_sec = SECSPERMIN / 2; 254 value.it_interval.tv_usec = 0; 255 value.it_value = value.it_interval; 256 (void)setitimer(ITIMER_REAL, &value, NULL); 257 for (;;) { 258 if (flush) { 259 if (outcc) { 260 (void)fflush(fscript); 261 outcc = 0; 262 } 263 flush = 0; 264 } 265 cc = read(master, obuf, sizeof (obuf)); 266 if (cc == -1 && errno == EINTR) 267 continue; 268 if (cc <= 0) 269 break; 270 for (off = 0; off < cc; ) { 271 ssize_t n = write(1, obuf + off, cc - off); 272 if (n == 0) 273 break; /* skip writing */ 274 if (n > 0) 275 off += n; 276 } 277 (void)fwrite(obuf, 1, cc, fscript); 278 outcc += cc; 279 } 280 done(0); 281 } 282 283 /* ARGSUSED */ 284 void 285 scriptflush(int signo) 286 { 287 flush = 1; 288 } 289 290 void 291 doshell(void) 292 { 293 char *shell; 294 295 shell = getenv("SHELL"); 296 if (shell == NULL) 297 shell = _PATH_BSHELL; 298 299 (void)close(master); 300 (void)fclose(fscript); 301 login_tty(slave); 302 execl(shell, shell, "-i", (char *)NULL); 303 warn("%s", shell); 304 fail(); 305 } 306 307 void 308 fail(void) 309 { 310 311 (void)kill(0, SIGTERM); 312 done(1); 313 } 314 315 void 316 done(int eval) 317 { 318 time_t tvec; 319 320 if (subchild) { 321 tvec = time(NULL); 322 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 323 (void)fclose(fscript); 324 (void)close(master); 325 } else { 326 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 327 (void)printf("Script done, output file is %s\n", fname); 328 } 329 exit(eval); 330 } 331