1 /* $NetBSD: script.c,v 1.23 2020/08/02 16:23:33 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 __RCSID("$NetBSD: script.c,v 1.23 2020/08/02 16:23:33 christos Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/wait.h> 47 #include <sys/stat.h> 48 #include <sys/ioctl.h> 49 #include <sys/time.h> 50 #include <sys/param.h> 51 #include <sys/uio.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <paths.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <termios.h> 62 #include <time.h> 63 #include <tzfile.h> 64 #include <unistd.h> 65 #include <util.h> 66 67 #define DEF_BUF 65536 68 69 struct stamp { 70 uint64_t scr_len; /* amount of data */ 71 uint64_t scr_sec; /* time it arrived in seconds... */ 72 uint32_t scr_usec; /* ...and microseconds */ 73 uint32_t scr_direction; /* 'i', 'o', etc (also indicates endianness) */ 74 }; 75 76 static FILE *fscript; 77 static int master, slave; 78 static int child, subchild; 79 static size_t outcc; 80 static int usesleep, rawout; 81 static int quiet, flush; 82 static const char *fname; 83 84 static int isterm; 85 static struct termios tt; 86 87 __dead static void done(void); 88 __dead static void dooutput(void); 89 __dead static void doshell(const char *); 90 __dead static void fail(void); 91 static void finish(int); 92 static void scriptflush(int); 93 static void record(FILE *, char *, size_t, int); 94 static void consume(FILE *, off_t, char *, int); 95 __dead static void playback(FILE *); 96 97 int 98 main(int argc, char *argv[]) 99 { 100 ssize_t scc; 101 size_t cc; 102 struct termios rtt; 103 struct winsize win; 104 int aflg, pflg, ch; 105 char ibuf[BUFSIZ]; 106 const char *command; 107 108 aflg = 0; 109 pflg = 0; 110 usesleep = 1; 111 rawout = 0; 112 quiet = 0; 113 flush = 0; 114 command = NULL; 115 while ((ch = getopt(argc, argv, "ac:dfpqr")) != -1) 116 switch(ch) { 117 case 'a': 118 aflg = 1; 119 break; 120 case 'c': 121 command = optarg; 122 break; 123 case 'd': 124 usesleep = 0; 125 break; 126 case 'f': 127 flush = 1; 128 break; 129 case 'p': 130 pflg = 1; 131 break; 132 case 'q': 133 quiet = 1; 134 break; 135 case 'r': 136 rawout = 1; 137 break; 138 case '?': 139 default: 140 (void)fprintf(stderr, 141 "Usage: %s [-c <command>][-adfpqr] [file]\n", 142 getprogname()); 143 exit(EXIT_FAILURE); 144 } 145 argc -= optind; 146 argv += optind; 147 148 if (argc > 0) 149 fname = argv[0]; 150 else 151 fname = "typescript"; 152 153 if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL) 154 err(EXIT_FAILURE, "fopen %s", fname); 155 156 if (pflg) 157 playback(fscript); 158 159 isterm = isatty(STDIN_FILENO); 160 if (isterm) { 161 if (tcgetattr(STDIN_FILENO, &tt) == -1) 162 err(EXIT_FAILURE, "tcgetattr"); 163 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1) 164 err(EXIT_FAILURE, "ioctl"); 165 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 166 err(EXIT_FAILURE, "openpty"); 167 } else { 168 if (openpty(&master, &slave, NULL, NULL, NULL) == -1) 169 err(EXIT_FAILURE, "openpty"); 170 } 171 172 if (!quiet) 173 (void)printf("Script started, output file is %s\n", fname); 174 175 if (isterm) { 176 rtt = tt; 177 cfmakeraw(&rtt); 178 rtt.c_lflag &= ~ECHO; 179 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 180 } 181 182 (void)signal(SIGCHLD, finish); 183 child = fork(); 184 if (child == -1) { 185 warn("fork"); 186 fail(); 187 } 188 if (child == 0) { 189 subchild = child = fork(); 190 if (child == -1) { 191 warn("fork"); 192 fail(); 193 } 194 if (child) 195 dooutput(); 196 else 197 doshell(command); 198 } 199 200 if (!rawout) 201 (void)fclose(fscript); 202 while ((scc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) { 203 cc = (size_t)scc; 204 if (rawout) 205 record(fscript, ibuf, cc, 'i'); 206 (void)write(master, ibuf, cc); 207 } 208 done(); 209 /* NOTREACHED */ 210 return EXIT_SUCCESS; 211 } 212 213 static void 214 finish(int signo) 215 { 216 int die, pid, status; 217 218 die = 0; 219 while ((pid = wait3(&status, WNOHANG, 0)) > 0) 220 if (pid == child) 221 die = 1; 222 223 if (die) 224 done(); 225 } 226 227 static void 228 dooutput(void) 229 { 230 struct itimerval value; 231 ssize_t scc; 232 size_t cc; 233 time_t tvec; 234 char obuf[BUFSIZ]; 235 236 (void)close(STDIN_FILENO); 237 tvec = time(NULL); 238 if (rawout) 239 record(fscript, NULL, 0, 's'); 240 else if (!quiet) 241 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 242 243 (void)signal(SIGALRM, scriptflush); 244 value.it_interval.tv_sec = SECSPERMIN / 2; 245 value.it_interval.tv_usec = 0; 246 value.it_value = value.it_interval; 247 (void)setitimer(ITIMER_REAL, &value, NULL); 248 for (;;) { 249 scc = read(master, obuf, sizeof(obuf)); 250 if (scc <= 0) 251 break; 252 cc = (size_t)scc; 253 (void)write(1, obuf, cc); 254 if (rawout) 255 record(fscript, obuf, cc, 'o'); 256 else 257 (void)fwrite(obuf, 1, cc, fscript); 258 outcc += cc; 259 if (flush) 260 (void)fflush(fscript); 261 } 262 done(); 263 } 264 265 static void 266 scriptflush(int signo) 267 { 268 if (outcc) { 269 (void)fflush(fscript); 270 outcc = 0; 271 } 272 } 273 274 static void 275 doshell(const char *command) 276 { 277 const char *shell; 278 279 (void)close(master); 280 (void)fclose(fscript); 281 login_tty(slave); 282 if (command == NULL) { 283 shell = getenv("SHELL"); 284 if (shell == NULL) 285 shell = _PATH_BSHELL; 286 execl(shell, shell, "-i", NULL); 287 warn("execl `%s'", shell); 288 } else { 289 if (system(command) == -1) 290 warn("system `%s'", command); 291 } 292 293 fail(); 294 } 295 296 static void 297 fail(void) 298 { 299 300 (void)kill(0, SIGTERM); 301 done(); 302 } 303 304 static void 305 done(void) 306 { 307 time_t tvec; 308 309 if (subchild) { 310 tvec = time(NULL); 311 if (rawout) 312 record(fscript, NULL, 0, 'e'); 313 else if (!quiet) 314 (void)fprintf(fscript,"\nScript done on %s", 315 ctime(&tvec)); 316 (void)fclose(fscript); 317 (void)close(master); 318 } else { 319 if (isterm) 320 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 321 if (!quiet) 322 (void)printf("Script done, output file is %s\n", fname); 323 } 324 exit(EXIT_SUCCESS); 325 } 326 327 static void 328 record(FILE *fp, char *buf, size_t cc, int direction) 329 { 330 struct iovec iov[2]; 331 struct stamp stamp; 332 struct timeval tv; 333 334 (void)gettimeofday(&tv, NULL); 335 stamp.scr_len = cc; 336 stamp.scr_sec = tv.tv_sec; 337 stamp.scr_usec = tv.tv_usec; 338 stamp.scr_direction = direction; 339 iov[0].iov_len = sizeof(stamp); 340 iov[0].iov_base = &stamp; 341 iov[1].iov_len = cc; 342 iov[1].iov_base = buf; 343 if (writev(fileno(fp), &iov[0], 2) == -1) 344 err(EXIT_FAILURE, "writev"); 345 } 346 347 static void 348 consume(FILE *fp, off_t len, char *buf, int reg) 349 { 350 size_t l; 351 352 if (reg) { 353 if (fseeko(fp, len, SEEK_CUR) == -1) 354 err(EXIT_FAILURE, NULL); 355 } 356 else { 357 while (len > 0) { 358 l = MIN(DEF_BUF, len); 359 if (fread(buf, sizeof(char), l, fp) != l) 360 err(EXIT_FAILURE, "cannot read buffer"); 361 len -= l; 362 } 363 } 364 } 365 366 #define swapstamp(stamp) do { \ 367 if (stamp.scr_direction > 0xff) { \ 368 stamp.scr_len = bswap64(stamp.scr_len); \ 369 stamp.scr_sec = bswap64(stamp.scr_sec); \ 370 stamp.scr_usec = bswap32(stamp.scr_usec); \ 371 stamp.scr_direction = bswap32(stamp.scr_direction); \ 372 } \ 373 } while (0/*CONSTCOND*/) 374 375 static void 376 termset(void) 377 { 378 struct termios traw; 379 380 isterm = isatty(STDOUT_FILENO); 381 if (!isterm) 382 return; 383 384 if (tcgetattr(STDOUT_FILENO, &tt) == -1) 385 err(EXIT_FAILURE, "tcgetattr"); 386 387 traw = tt; 388 cfmakeraw(&traw); 389 traw.c_lflag |= ISIG; 390 if (tcsetattr(STDOUT_FILENO, TCSANOW, &traw) == -1) 391 err(EXIT_FAILURE, "tcsetattr"); 392 } 393 394 static void 395 termreset(void) 396 { 397 if (isterm) 398 (void)tcsetattr(STDOUT_FILENO, TCSADRAIN, &tt); 399 400 isterm = 0; 401 } 402 403 static void 404 playback(FILE *fp) 405 { 406 struct timespec tsi, tso; 407 struct stamp stamp; 408 struct stat pst; 409 char buf[DEF_BUF]; 410 off_t nread, save_len; 411 size_t l; 412 time_t tclock; 413 int reg; 414 415 if (fstat(fileno(fp), &pst) == -1) 416 err(EXIT_FAILURE, "fstat failed"); 417 418 reg = S_ISREG(pst.st_mode); 419 420 for (nread = 0; !reg || nread < pst.st_size; nread += save_len) { 421 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) { 422 if (reg) 423 err(EXIT_FAILURE, "reading playback header"); 424 else 425 break; 426 } 427 swapstamp(stamp); 428 save_len = sizeof(stamp); 429 430 if (reg && stamp.scr_len > 431 (uint64_t)(pst.st_size - save_len) - nread) 432 errx(EXIT_FAILURE, "invalid stamp"); 433 434 save_len += stamp.scr_len; 435 tclock = stamp.scr_sec; 436 tso.tv_sec = stamp.scr_sec; 437 tso.tv_nsec = stamp.scr_usec * 1000; 438 439 switch (stamp.scr_direction) { 440 case 's': 441 if (!quiet) 442 (void)printf("Script started on %s", 443 ctime(&tclock)); 444 tsi = tso; 445 (void)consume(fp, stamp.scr_len, buf, reg); 446 termset(); 447 atexit(termreset); 448 break; 449 case 'e': 450 termreset(); 451 if (!quiet) 452 (void)printf("\nScript done on %s", 453 ctime(&tclock)); 454 (void)consume(fp, stamp.scr_len, buf, reg); 455 break; 456 case 'i': 457 /* throw input away */ 458 (void)consume(fp, stamp.scr_len, buf, reg); 459 break; 460 case 'o': 461 tsi.tv_sec = tso.tv_sec - tsi.tv_sec; 462 tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec; 463 if (tsi.tv_nsec < 0) { 464 tsi.tv_sec -= 1; 465 tsi.tv_nsec += 1000000000; 466 } 467 if (usesleep) 468 (void)nanosleep(&tsi, NULL); 469 tsi = tso; 470 while (stamp.scr_len > 0) { 471 l = MIN(DEF_BUF, stamp.scr_len); 472 if (fread(buf, sizeof(char), l, fp) != l) 473 err(EXIT_FAILURE, "cannot read buffer"); 474 475 (void)write(STDOUT_FILENO, buf, l); 476 stamp.scr_len -= l; 477 } 478 break; 479 default: 480 errx(EXIT_FAILURE, "invalid direction %u", 481 stamp.scr_direction); 482 } 483 } 484 (void)fclose(fp); 485 exit(EXIT_SUCCESS); 486 } 487