1 /* $OpenBSD: script.c,v 1.19 2003/06/10 22:20:50 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 1.19 2003/06/10 22:20:50 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 pid_t child, subchild; 94 char *fname; 95 96 volatile sig_atomic_t dead; 97 volatile sig_atomic_t sigdeadstatus; 98 volatile sig_atomic_t flush; 99 100 struct termios tt; 101 102 __dead void done(int); 103 void dooutput(void); 104 void doshell(void); 105 void fail(void); 106 void finish(int); 107 void scriptflush(int); 108 void handlesigwinch(int); 109 110 int 111 main(int argc, char *argv[]) 112 { 113 struct sigaction sa; 114 struct termios rtt; 115 struct winsize win; 116 char ibuf[BUFSIZ]; 117 ssize_t cc, off; 118 int aflg, ch; 119 120 aflg = 0; 121 while ((ch = getopt(argc, argv, "a")) != -1) 122 switch(ch) { 123 case 'a': 124 aflg = 1; 125 break; 126 default: 127 (void)fprintf(stderr, "usage: script [-a] [file]\n"); 128 exit(1); 129 } 130 argc -= optind; 131 argv += optind; 132 133 if (argc > 0) 134 fname = argv[0]; 135 else 136 fname = "typescript"; 137 138 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 139 err(1, "%s", fname); 140 141 (void)tcgetattr(STDIN_FILENO, &tt); 142 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 143 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 144 err(1, "openpty"); 145 146 (void)printf("Script started, output file is %s\n", fname); 147 rtt = tt; 148 cfmakeraw(&rtt); 149 rtt.c_lflag &= ~ECHO; 150 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 151 152 bzero(&sa, sizeof sa); 153 sigemptyset(&sa.sa_mask); 154 sa.sa_handler = finish; 155 (void)sigaction(SIGCHLD, &sa, NULL); 156 157 sa.sa_handler = handlesigwinch; 158 sa.sa_flags = SA_RESTART; 159 (void)sigaction(SIGWINCH, &sa, NULL); 160 161 child = fork(); 162 if (child < 0) { 163 perror("fork"); 164 fail(); 165 } 166 if (child == 0) { 167 subchild = child = fork(); 168 if (child < 0) { 169 perror("fork"); 170 fail(); 171 } 172 if (child) 173 dooutput(); 174 else 175 doshell(); 176 } 177 178 (void)fclose(fscript); 179 while (1) { 180 if (dead) 181 break; 182 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 183 if (cc == -1 && errno == EINTR) 184 continue; 185 if (cc <= 0) 186 break; 187 for (off = 0; off < cc; ) { 188 ssize_t n = write(master, ibuf + off, cc - off); 189 if (n == 0) 190 break; /* skip writing */ 191 if (n > 0) 192 off += n; 193 } 194 } 195 done(sigdeadstatus); 196 } 197 198 void 199 finish(int signo) 200 { 201 int save_errno = errno; 202 int status, e = 1; 203 pid_t pid; 204 205 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 206 if (pid == child) { 207 if (WIFEXITED(status)) 208 e = WEXITSTATUS(status); 209 } 210 } 211 dead = 1; 212 sigdeadstatus = e; 213 errno = save_errno; 214 } 215 216 void 217 handlesigwinch(int signo) 218 { 219 int save_errno = errno; 220 struct winsize win; 221 pid_t pgrp; 222 223 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 224 ioctl(slave, TIOCSWINSZ, &win); 225 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 226 killpg(pgrp, SIGWINCH); 227 } 228 errno = save_errno; 229 } 230 231 void 232 dooutput(void) 233 { 234 struct sigaction sa; 235 struct itimerval value; 236 char obuf[BUFSIZ]; 237 time_t tvec; 238 ssize_t outcc = 0, cc, off; 239 240 (void)close(STDIN_FILENO); 241 tvec = time(NULL); 242 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 243 244 bzero(&sa, sizeof sa); 245 sigemptyset(&sa.sa_mask); 246 sa.sa_handler = scriptflush; 247 (void)sigaction(SIGALRM, &sa, NULL); 248 249 value.it_interval.tv_sec = SECSPERMIN / 2; 250 value.it_interval.tv_usec = 0; 251 value.it_value = value.it_interval; 252 (void)setitimer(ITIMER_REAL, &value, NULL); 253 for (;;) { 254 if (flush) { 255 if (outcc) { 256 (void)fflush(fscript); 257 outcc = 0; 258 } 259 flush = 0; 260 } 261 cc = read(master, obuf, sizeof (obuf)); 262 if (cc == -1 && errno == EINTR) 263 continue; 264 if (cc <= 0) 265 break; 266 for (off = 0; off < cc; ) { 267 ssize_t n = write(1, obuf + off, cc - off); 268 if (n == 0) 269 break; /* skip writing */ 270 if (n > 0) 271 off += n; 272 } 273 (void)fwrite(obuf, 1, cc, fscript); 274 outcc += cc; 275 } 276 done(0); 277 } 278 279 void 280 scriptflush(int signo) 281 { 282 flush = 1; 283 } 284 285 void 286 doshell(void) 287 { 288 char *shell; 289 290 shell = getenv("SHELL"); 291 if (shell == NULL) 292 shell = _PATH_BSHELL; 293 294 (void)close(master); 295 (void)fclose(fscript); 296 login_tty(slave); 297 execl(shell, shell, "-i", (char *)NULL); 298 perror(shell); 299 fail(); 300 } 301 302 void 303 fail(void) 304 { 305 306 (void)kill(0, SIGTERM); 307 done(1); 308 } 309 310 void 311 done(int eval) 312 { 313 time_t tvec; 314 315 if (subchild) { 316 tvec = time(NULL); 317 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 318 (void)fclose(fscript); 319 (void)close(master); 320 } else { 321 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 322 (void)printf("Script done, output file is %s\n", fname); 323 } 324 exit(eval); 325 } 326