1 /* $OpenBSD: script.c,v 1.20 2004/09/14 23:53:07 deraadt 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 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 char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; 67 #endif 68 static char rcsid[] = "$OpenBSD: script.c,v 1.20 2004/09/14 23:53:07 deraadt 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 struct sigaction sa; 115 struct termios rtt; 116 struct winsize win; 117 char ibuf[BUFSIZ]; 118 ssize_t cc, off; 119 int aflg, ch; 120 121 aflg = 0; 122 while ((ch = getopt(argc, argv, "a")) != -1) 123 switch(ch) { 124 case 'a': 125 aflg = 1; 126 break; 127 default: 128 (void)fprintf(stderr, "usage: script [-a] [file]\n"); 129 exit(1); 130 } 131 argc -= optind; 132 argv += optind; 133 134 if (argc > 0) 135 fname = argv[0]; 136 else 137 fname = "typescript"; 138 139 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 140 err(1, "%s", fname); 141 142 (void)tcgetattr(STDIN_FILENO, &tt); 143 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 144 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 145 err(1, "openpty"); 146 147 (void)printf("Script started, output file is %s\n", fname); 148 rtt = tt; 149 cfmakeraw(&rtt); 150 rtt.c_lflag &= ~ECHO; 151 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 152 153 bzero(&sa, sizeof sa); 154 sigemptyset(&sa.sa_mask); 155 sa.sa_handler = finish; 156 (void)sigaction(SIGCHLD, &sa, NULL); 157 158 sa.sa_handler = handlesigwinch; 159 sa.sa_flags = SA_RESTART; 160 (void)sigaction(SIGWINCH, &sa, NULL); 161 162 child = fork(); 163 if (child < 0) { 164 perror("fork"); 165 fail(); 166 } 167 if (child == 0) { 168 subchild = child = fork(); 169 if (child < 0) { 170 perror("fork"); 171 fail(); 172 } 173 if (child) 174 dooutput(); 175 else 176 doshell(); 177 } 178 179 (void)fclose(fscript); 180 while (1) { 181 if (dead) 182 break; 183 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 184 if (cc == -1 && errno == EINTR) 185 continue; 186 if (cc <= 0) 187 break; 188 for (off = 0; off < cc; ) { 189 ssize_t n = write(master, ibuf + off, cc - off); 190 if (n == 0) 191 break; /* skip writing */ 192 if (n > 0) 193 off += n; 194 } 195 } 196 done(sigdeadstatus); 197 } 198 199 /* ARGSUSED */ 200 void 201 finish(int signo) 202 { 203 int save_errno = errno; 204 int status, e = 1; 205 pid_t pid; 206 207 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 208 if (pid == (pid_t)child) { 209 if (WIFEXITED(status)) 210 e = WEXITSTATUS(status); 211 } 212 } 213 dead = 1; 214 sigdeadstatus = e; 215 errno = save_errno; 216 } 217 218 /* ARGSUSED */ 219 void 220 handlesigwinch(int signo) 221 { 222 int save_errno = errno; 223 struct winsize win; 224 pid_t pgrp; 225 226 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 227 ioctl(slave, TIOCSWINSZ, &win); 228 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 229 killpg(pgrp, SIGWINCH); 230 } 231 errno = save_errno; 232 } 233 234 void 235 dooutput(void) 236 { 237 struct sigaction sa; 238 struct itimerval value; 239 char obuf[BUFSIZ]; 240 time_t tvec; 241 ssize_t outcc = 0, cc, off; 242 243 (void)close(STDIN_FILENO); 244 tvec = time(NULL); 245 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 246 247 bzero(&sa, sizeof sa); 248 sigemptyset(&sa.sa_mask); 249 sa.sa_handler = scriptflush; 250 (void)sigaction(SIGALRM, &sa, NULL); 251 252 value.it_interval.tv_sec = SECSPERMIN / 2; 253 value.it_interval.tv_usec = 0; 254 value.it_value = value.it_interval; 255 (void)setitimer(ITIMER_REAL, &value, NULL); 256 for (;;) { 257 if (flush) { 258 if (outcc) { 259 (void)fflush(fscript); 260 outcc = 0; 261 } 262 flush = 0; 263 } 264 cc = read(master, obuf, sizeof (obuf)); 265 if (cc == -1 && errno == EINTR) 266 continue; 267 if (cc <= 0) 268 break; 269 for (off = 0; off < cc; ) { 270 ssize_t n = write(1, obuf + off, cc - off); 271 if (n == 0) 272 break; /* skip writing */ 273 if (n > 0) 274 off += n; 275 } 276 (void)fwrite(obuf, 1, cc, fscript); 277 outcc += cc; 278 } 279 done(0); 280 } 281 282 /* ARGSUSED */ 283 void 284 scriptflush(int signo) 285 { 286 flush = 1; 287 } 288 289 void 290 doshell(void) 291 { 292 char *shell; 293 294 shell = getenv("SHELL"); 295 if (shell == NULL) 296 shell = _PATH_BSHELL; 297 298 (void)close(master); 299 (void)fclose(fscript); 300 login_tty(slave); 301 execl(shell, shell, "-i", (char *)NULL); 302 perror(shell); 303 fail(); 304 } 305 306 void 307 fail(void) 308 { 309 310 (void)kill(0, SIGTERM); 311 done(1); 312 } 313 314 void 315 done(int eval) 316 { 317 time_t tvec; 318 319 if (subchild) { 320 tvec = time(NULL); 321 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 322 (void)fclose(fscript); 323 (void)close(master); 324 } else { 325 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 326 (void)printf("Script done, output file is %s\n", fname); 327 } 328 exit(eval); 329 } 330