script.c revision 1.25
1 /* $NetBSD: script.c,v 1.25 2020/08/07 13:36:28 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 1.25 2020/08/07 13:36:28 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 if (tcgetattr(STDIN_FILENO, &tt) == -1 || 160 ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1) { 161 switch (errno) { 162 case ENOTTY: 163 if (openpty(&master, &slave, NULL, NULL, NULL) == -1) 164 err(EXIT_FAILURE, "openpty"); 165 break; 166 case EBADF: 167 err(EXIT_FAILURE, "%d not valid fd", STDIN_FILENO); 168 default: /* errno == EFAULT or EINVAL for ioctl. Not reached in practice. */ 169 err(EXIT_FAILURE, "ioctl"); 170 } 171 } else { 172 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 173 err(EXIT_FAILURE, "openpty"); 174 isterm = 1; 175 } 176 177 if (!quiet) 178 (void)printf("Script started, output file is %s\n", fname); 179 180 if (isterm) { 181 rtt = tt; 182 cfmakeraw(&rtt); 183 rtt.c_lflag &= ~ECHO; 184 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 185 } 186 187 (void)signal(SIGCHLD, finish); 188 child = fork(); 189 if (child == -1) { 190 warn("fork"); 191 fail(); 192 } 193 if (child == 0) { 194 subchild = child = fork(); 195 if (child == -1) { 196 warn("fork"); 197 fail(); 198 } 199 if (child) 200 dooutput(); 201 else 202 doshell(command); 203 } 204 205 if (!rawout) 206 (void)fclose(fscript); 207 while ((scc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) { 208 cc = (size_t)scc; 209 if (rawout) 210 record(fscript, ibuf, cc, 'i'); 211 (void)write(master, ibuf, cc); 212 } 213 done(); 214 /* NOTREACHED */ 215 return EXIT_SUCCESS; 216 } 217 218 static void 219 finish(int signo) 220 { 221 int die, pid, status; 222 223 die = 0; 224 while ((pid = wait3(&status, WNOHANG, 0)) > 0) 225 if (pid == child) 226 die = 1; 227 228 if (die) 229 done(); 230 } 231 232 static void 233 dooutput(void) 234 { 235 struct itimerval value; 236 ssize_t scc; 237 size_t cc; 238 time_t tvec; 239 char obuf[BUFSIZ]; 240 241 (void)close(STDIN_FILENO); 242 tvec = time(NULL); 243 if (rawout) 244 record(fscript, NULL, 0, 's'); 245 else if (!quiet) 246 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 247 248 (void)signal(SIGALRM, scriptflush); 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 scc = read(master, obuf, sizeof(obuf)); 255 if (scc <= 0) 256 break; 257 cc = (size_t)scc; 258 (void)write(1, obuf, cc); 259 if (rawout) 260 record(fscript, obuf, cc, 'o'); 261 else 262 (void)fwrite(obuf, 1, cc, fscript); 263 outcc += cc; 264 if (flush) 265 (void)fflush(fscript); 266 } 267 done(); 268 } 269 270 static void 271 scriptflush(int signo) 272 { 273 if (outcc) { 274 (void)fflush(fscript); 275 outcc = 0; 276 } 277 } 278 279 static void 280 doshell(const char *command) 281 { 282 const char *shell; 283 284 (void)close(master); 285 (void)fclose(fscript); 286 login_tty(slave); 287 if (command == NULL) { 288 shell = getenv("SHELL"); 289 if (shell == NULL) 290 shell = _PATH_BSHELL; 291 execl(shell, shell, "-i", NULL); 292 warn("execl `%s'", shell); 293 } else { 294 if (system(command) == -1) 295 warn("system `%s'", command); 296 } 297 298 fail(); 299 } 300 301 static void 302 fail(void) 303 { 304 305 (void)kill(0, SIGTERM); 306 done(); 307 } 308 309 static void 310 done(void) 311 { 312 time_t tvec; 313 314 if (subchild) { 315 tvec = time(NULL); 316 if (rawout) 317 record(fscript, NULL, 0, 'e'); 318 else if (!quiet) 319 (void)fprintf(fscript,"\nScript done on %s", 320 ctime(&tvec)); 321 (void)fclose(fscript); 322 (void)close(master); 323 } else { 324 if (isterm) 325 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 326 if (!quiet) 327 (void)printf("Script done, output file is %s\n", fname); 328 } 329 exit(EXIT_SUCCESS); 330 } 331 332 static void 333 record(FILE *fp, char *buf, size_t cc, int direction) 334 { 335 struct iovec iov[2]; 336 struct stamp stamp; 337 struct timeval tv; 338 339 (void)gettimeofday(&tv, NULL); 340 stamp.scr_len = cc; 341 stamp.scr_sec = tv.tv_sec; 342 stamp.scr_usec = tv.tv_usec; 343 stamp.scr_direction = direction; 344 iov[0].iov_len = sizeof(stamp); 345 iov[0].iov_base = &stamp; 346 iov[1].iov_len = cc; 347 iov[1].iov_base = buf; 348 if (writev(fileno(fp), &iov[0], 2) == -1) 349 err(EXIT_FAILURE, "writev"); 350 } 351 352 static void 353 consume(FILE *fp, off_t len, char *buf, int reg) 354 { 355 size_t l; 356 357 if (reg) { 358 if (fseeko(fp, len, SEEK_CUR) == -1) 359 err(EXIT_FAILURE, NULL); 360 } 361 else { 362 while (len > 0) { 363 l = MIN(DEF_BUF, len); 364 if (fread(buf, sizeof(char), l, fp) != l) 365 err(EXIT_FAILURE, "cannot read buffer"); 366 len -= l; 367 } 368 } 369 } 370 371 #define swapstamp(stamp) do { \ 372 if (stamp.scr_direction > 0xff) { \ 373 stamp.scr_len = bswap64(stamp.scr_len); \ 374 stamp.scr_sec = bswap64(stamp.scr_sec); \ 375 stamp.scr_usec = bswap32(stamp.scr_usec); \ 376 stamp.scr_direction = bswap32(stamp.scr_direction); \ 377 } \ 378 } while (0/*CONSTCOND*/) 379 380 static void 381 termset(void) 382 { 383 struct termios traw; 384 385 if (tcgetattr(STDOUT_FILENO, &tt) == -1) { 386 if (errno == EBADF) 387 err(EXIT_FAILURE, "%d not valid fd", STDOUT_FILENO); 388 /* errno == ENOTTY */ 389 return; 390 } 391 isterm = 1; 392 traw = tt; 393 cfmakeraw(&traw); 394 traw.c_lflag |= ISIG; 395 (void)tcsetattr(STDOUT_FILENO, TCSANOW, &traw); 396 } 397 398 static void 399 termreset(void) 400 { 401 if (isterm) 402 (void)tcsetattr(STDOUT_FILENO, TCSADRAIN, &tt); 403 404 isterm = 0; 405 } 406 407 static void 408 playback(FILE *fp) 409 { 410 struct timespec tsi, tso; 411 struct stamp stamp; 412 struct stat pst; 413 char buf[DEF_BUF]; 414 off_t nread, save_len; 415 size_t l; 416 time_t tclock; 417 int reg; 418 419 if (fstat(fileno(fp), &pst) == -1) 420 err(EXIT_FAILURE, "fstat failed"); 421 422 reg = S_ISREG(pst.st_mode); 423 424 for (nread = 0; !reg || nread < pst.st_size; nread += save_len) { 425 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) { 426 if (reg) 427 err(EXIT_FAILURE, "reading playback header"); 428 else 429 break; 430 } 431 swapstamp(stamp); 432 save_len = sizeof(stamp); 433 434 if (reg && stamp.scr_len > 435 (uint64_t)(pst.st_size - save_len) - nread) 436 errx(EXIT_FAILURE, "invalid stamp"); 437 438 save_len += stamp.scr_len; 439 tclock = stamp.scr_sec; 440 tso.tv_sec = stamp.scr_sec; 441 tso.tv_nsec = stamp.scr_usec * 1000; 442 443 switch (stamp.scr_direction) { 444 case 's': 445 if (!quiet) 446 (void)printf("Script started on %s", 447 ctime(&tclock)); 448 tsi = tso; 449 (void)consume(fp, stamp.scr_len, buf, reg); 450 termset(); 451 atexit(termreset); 452 break; 453 case 'e': 454 termreset(); 455 if (!quiet) 456 (void)printf("\nScript done on %s", 457 ctime(&tclock)); 458 (void)consume(fp, stamp.scr_len, buf, reg); 459 break; 460 case 'i': 461 /* throw input away */ 462 (void)consume(fp, stamp.scr_len, buf, reg); 463 break; 464 case 'o': 465 tsi.tv_sec = tso.tv_sec - tsi.tv_sec; 466 tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec; 467 if (tsi.tv_nsec < 0) { 468 tsi.tv_sec -= 1; 469 tsi.tv_nsec += 1000000000; 470 } 471 if (usesleep) 472 (void)nanosleep(&tsi, NULL); 473 tsi = tso; 474 while (stamp.scr_len > 0) { 475 l = MIN(DEF_BUF, stamp.scr_len); 476 if (fread(buf, sizeof(char), l, fp) != l) 477 err(EXIT_FAILURE, "cannot read buffer"); 478 479 (void)write(STDOUT_FILENO, buf, l); 480 stamp.scr_len -= l; 481 } 482 break; 483 default: 484 errx(EXIT_FAILURE, "invalid direction %u", 485 stamp.scr_direction); 486 } 487 } 488 (void)fclose(fp); 489 exit(EXIT_SUCCESS); 490 } 491
Indexes created Wed Sep 24 15:09:51 GMT 2025