script.c revision 1.30
1 /* $NetBSD: script.c,v 1.30 2022/01/20 19:49:51 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 1.30 2022/01/20 19:49:51 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 eflag; 85 static int isterm; 86 static struct termios tt; 87 88 __dead static void done(int); 89 __dead static void doshell(const char *); 90 __dead static void fail(void); 91 static void dooutput(void); 92 static void finish(int); 93 static void scriptflush(int); 94 static void record(FILE *, char *, size_t, int); 95 static void consume(FILE *, off_t, char *, int); 96 __dead static void playback(FILE *); 97 98 int 99 main(int argc, char *argv[]) 100 { 101 ssize_t scc; 102 size_t cc; 103 struct termios rtt; 104 struct winsize win; 105 int aflg, pflg, ch; 106 char ibuf[BUFSIZ]; 107 const char *command; 108 109 aflg = 0; 110 pflg = 0; 111 usesleep = 1; 112 rawout = 0; 113 quiet = 0; 114 flush = 0; 115 command = NULL; 116 while ((ch = getopt(argc, argv, "ac:defpqr")) != -1) 117 switch(ch) { 118 case 'a': 119 aflg = 1; 120 break; 121 case 'c': 122 command = optarg; 123 break; 124 case 'd': 125 usesleep = 0; 126 break; 127 case 'e': 128 eflag = 1; 129 break; 130 case 'f': 131 flush = 1; 132 break; 133 case 'p': 134 pflg = 1; 135 break; 136 case 'q': 137 quiet = 1; 138 break; 139 case 'r': 140 rawout = 1; 141 break; 142 case '?': 143 default: 144 (void)fprintf(stderr, 145 "Usage: %s [-c <command>][-adefpqr] [file]\n", 146 getprogname()); 147 exit(EXIT_FAILURE); 148 } 149 argc -= optind; 150 argv += optind; 151 152 if (argc > 0) 153 fname = argv[0]; 154 else 155 fname = "typescript"; 156 157 if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL) 158 err(EXIT_FAILURE, "fopen %s", fname); 159 160 if (pflg) 161 playback(fscript); 162 163 if (tcgetattr(STDIN_FILENO, &tt) == -1 || 164 ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1) { 165 if (errno != ENOTTY) /* For debugger. */ 166 err(EXIT_FAILURE, "tcgetattr/ioctl"); 167 if (openpty(&master, &slave, NULL, NULL, NULL) == -1) 168 err(EXIT_FAILURE, "openpty"); 169 } else { 170 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 171 err(EXIT_FAILURE, "openpty"); 172 isterm = 1; 173 } 174 175 if (!quiet) 176 (void)printf("Script started, output file is %s\n", fname); 177 178 if (isterm) { 179 rtt = tt; 180 cfmakeraw(&rtt); 181 rtt.c_lflag &= ~ECHO; 182 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 183 } 184 185 (void)signal(SIGCHLD, finish); 186 child = fork(); 187 if (child == -1) { 188 warn("fork"); 189 fail(); 190 } 191 if (child == 0) { 192 subchild = child = fork(); 193 if (child == -1) { 194 warn("fork"); 195 fail(); 196 } 197 if (child) 198 dooutput(); 199 else 200 doshell(command); 201 } 202 203 if (!rawout) 204 (void)fclose(fscript); 205 while ((scc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) { 206 cc = (size_t)scc; 207 if (rawout) 208 record(fscript, ibuf, cc, 'i'); 209 (void)write(master, ibuf, cc); 210 } 211 finish(-1); 212 } 213 214 static void 215 finish(int signo) 216 { 217 int die, pid, status, cstat; 218 219 die = 0; 220 while ((pid = wait(&status)) > 0) 221 if (pid == child) { 222 cstat = status; 223 die = 1; 224 } 225 226 if (!die) 227 return; 228 if (!eflag) 229 done(EXIT_SUCCESS); 230 else if (WIFEXITED(cstat)) 231 done(WEXITSTATUS(cstat)); 232 else 233 done(128 + WTERMSIG(cstat)); 234 } 235 236 static void 237 dooutput(void) 238 { 239 struct itimerval value; 240 ssize_t scc; 241 size_t cc; 242 time_t tvec; 243 char obuf[BUFSIZ]; 244 245 (void)close(STDIN_FILENO); 246 tvec = time(NULL); 247 if (rawout) 248 record(fscript, NULL, 0, 's'); 249 else if (!quiet) 250 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 251 252 (void)signal(SIGALRM, scriptflush); 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 scc = read(master, obuf, sizeof(obuf)); 259 if (scc <= 0) 260 break; 261 cc = (size_t)scc; 262 (void)write(STDOUT_FILENO, obuf, cc); 263 if (rawout) 264 record(fscript, obuf, cc, 'o'); 265 else 266 (void)fwrite(obuf, 1, cc, fscript); 267 outcc += cc; 268 if (flush) 269 (void)fflush(fscript); 270 } 271 finish(-1); 272 } 273 274 static void 275 scriptflush(int signo) 276 { 277 if (outcc) { 278 (void)fflush(fscript); 279 outcc = 0; 280 } 281 } 282 283 static void 284 doshell(const char *command) 285 { 286 const char *shell; 287 288 (void)close(master); 289 (void)fclose(fscript); 290 login_tty(slave); 291 if (command == NULL) { 292 shell = getenv("SHELL"); 293 if (shell == NULL) 294 shell = _PATH_BSHELL; 295 execl(shell, shell, "-i", NULL); 296 warn("execl `%s'", shell); 297 } else { 298 if (system(command) == -1) 299 warn("system `%s'", command); 300 } 301 302 fail(); 303 } 304 305 static void 306 fail(void) 307 { 308 309 (void)kill(0, SIGTERM); 310 done(EXIT_FAILURE); 311 } 312 313 static void 314 done(int status) 315 { 316 time_t tvec; 317 318 if (subchild) { 319 tvec = time(NULL); 320 if (rawout) 321 record(fscript, NULL, 0, 'e'); 322 else if (!quiet) 323 (void)fprintf(fscript,"\nScript done on %s", 324 ctime(&tvec)); 325 (void)fclose(fscript); 326 (void)close(master); 327 } else { 328 if (isterm) 329 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 330 if (!quiet) 331 (void)printf("Script done, output file is %s\n", fname); 332 } 333 exit(status); 334 } 335 336 static void 337 record(FILE *fp, char *buf, size_t cc, int direction) 338 { 339 struct iovec iov[2]; 340 struct stamp stamp; 341 struct timeval tv; 342 343 (void)gettimeofday(&tv, NULL); 344 stamp.scr_len = cc; 345 stamp.scr_sec = tv.tv_sec; 346 stamp.scr_usec = tv.tv_usec; 347 stamp.scr_direction = direction; 348 iov[0].iov_len = sizeof(stamp); 349 iov[0].iov_base = &stamp; 350 iov[1].iov_len = cc; 351 iov[1].iov_base = buf; 352 if (writev(fileno(fp), &iov[0], 2) == -1) 353 err(EXIT_FAILURE, "writev"); 354 } 355 356 static void 357 consume(FILE *fp, off_t len, char *buf, int reg) 358 { 359 size_t l; 360 361 if (reg) { 362 if (fseeko(fp, len, SEEK_CUR) == -1) 363 err(EXIT_FAILURE, NULL); 364 } 365 else { 366 while (len > 0) { 367 l = MIN(DEF_BUF, len); 368 if (fread(buf, sizeof(char), l, fp) != l) 369 err(EXIT_FAILURE, "cannot read buffer"); 370 len -= l; 371 } 372 } 373 } 374 375 #define swapstamp(stamp) do { \ 376 if (stamp.scr_direction > 0xff) { \ 377 stamp.scr_len = bswap64(stamp.scr_len); \ 378 stamp.scr_sec = bswap64(stamp.scr_sec); \ 379 stamp.scr_usec = bswap32(stamp.scr_usec); \ 380 stamp.scr_direction = bswap32(stamp.scr_direction); \ 381 } \ 382 } while (0/*CONSTCOND*/) 383 384 static void 385 termset(void) 386 { 387 struct termios traw; 388 389 if (tcgetattr(STDOUT_FILENO, &tt) == -1) { 390 if (errno != ENOTTY) /* For debugger. */ 391 err(EXIT_FAILURE, "tcgetattr"); 392 return; 393 } 394 isterm = 1; 395 traw = tt; 396 cfmakeraw(&traw); 397 traw.c_lflag |= ISIG; 398 (void)tcsetattr(STDOUT_FILENO, TCSANOW, &traw); 399 } 400 401 static void 402 termreset(void) 403 { 404 if (isterm) 405 (void)tcsetattr(STDOUT_FILENO, TCSADRAIN, &tt); 406 407 isterm = 0; 408 } 409 410 static void 411 playback(FILE *fp) 412 { 413 struct timespec tsi, tso; 414 struct stamp stamp; 415 struct stat pst; 416 char buf[DEF_BUF]; 417 off_t nread, save_len; 418 size_t l; 419 time_t tclock; 420 int reg; 421 422 if (fstat(fileno(fp), &pst) == -1) 423 err(EXIT_FAILURE, "fstat failed"); 424 425 reg = S_ISREG(pst.st_mode); 426 427 for (nread = 0; !reg || nread < pst.st_size; nread += save_len) { 428 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) { 429 if (reg) 430 err(EXIT_FAILURE, "reading playback header"); 431 else 432 break; 433 } 434 swapstamp(stamp); 435 save_len = sizeof(stamp); 436 437 if (reg && stamp.scr_len > 438 (uint64_t)(pst.st_size - save_len) - nread) 439 errx(EXIT_FAILURE, "invalid stamp"); 440 441 save_len += stamp.scr_len; 442 tclock = stamp.scr_sec; 443 tso.tv_sec = stamp.scr_sec; 444 tso.tv_nsec = stamp.scr_usec * 1000; 445 446 switch (stamp.scr_direction) { 447 case 's': 448 if (!quiet) 449 (void)printf("Script started on %s", 450 ctime(&tclock)); 451 tsi = tso; 452 (void)consume(fp, stamp.scr_len, buf, reg); 453 termset(); 454 atexit(termreset); 455 break; 456 case 'e': 457 termreset(); 458 if (!quiet) 459 (void)printf("\nScript done on %s", 460 ctime(&tclock)); 461 (void)consume(fp, stamp.scr_len, buf, reg); 462 break; 463 case 'i': 464 /* throw input away */ 465 (void)consume(fp, stamp.scr_len, buf, reg); 466 break; 467 case 'o': 468 tsi.tv_sec = tso.tv_sec - tsi.tv_sec; 469 tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec; 470 if (tsi.tv_nsec < 0) { 471 tsi.tv_sec -= 1; 472 tsi.tv_nsec += 1000000000; 473 } 474 if (usesleep) 475 (void)nanosleep(&tsi, NULL); 476 tsi = tso; 477 while (stamp.scr_len > 0) { 478 l = MIN(DEF_BUF, stamp.scr_len); 479 if (fread(buf, sizeof(char), l, fp) != l) 480 err(EXIT_FAILURE, "cannot read buffer"); 481 482 (void)write(STDOUT_FILENO, buf, l); 483 stamp.scr_len -= l; 484 } 485 break; 486 default: 487 errx(EXIT_FAILURE, "invalid direction %u", 488 stamp.scr_direction); 489 } 490 } 491 (void)fclose(fp); 492 exit(EXIT_SUCCESS); 493 } 494
Indexes created Wed Sep 24 05:09:52 GMT 2025