usr.bin/script/script.c

   1 /*
   2  * Copyright (c) 2010, 2012  David E. O'Brien
   3  * Copyright (c) 1980, 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/param.h>
  32 __FBSDID("$FreeBSD$");
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1980, 1992, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif
  38 #ifndef lint
  39 static const char sccsid[] = "@(#)script.c      8.1 (Berkeley) 6/6/93";
  40 #endif
  41
  42 #include <sys/wait.h>
  43 #include <sys/stat.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/time.h>
  46 #include <sys/uio.h>
  47 #include <sys/endian.h>
  48 #include <dev/filemon/filemon.h>
  49
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <fcntl.h>
  53 #include <libutil.h>
  54 #include <paths.h>
  55 #include <signal.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <termios.h>
  60 #include <unistd.h>
  61
  62 #define DEF_BUF 65536
  63
  64 struct stamp {
  65         uint64_t scr_len;       /* amount of data */
  66         uint64_t scr_sec;       /* time it arrived in seconds... */
  67         uint32_t scr_usec;      /* ...and microseconds */
  68         uint32_t scr_direction; /* 'i', 'o', etc (also indicates endianness) */
  69 };
  70
  71 static FILE *fscript;
  72 static int master, slave;
  73 static int child;
  74 static const char *fname;
  75 static char *fmfname;
  76 static int fflg, qflg, ttyflg;
  77 static int usesleep, rawout;
  78
  79 static struct termios tt;
  80
  81 static void done(int) __dead2;
  82 static void doshell(char **);
  83 static void fail(void);
  84 static void finish(void);
  85 static void record(FILE *, char *, size_t, int);
  86 static void consume(FILE *, off_t, char *, int);
  87 static void playback(FILE *) __dead2;
  88 static void usage(void);
  89
  90 int
  91 main(int argc, char *argv[])
  92 {
  93         int cc;
  94         struct termios rtt, stt;
  95         struct winsize win;
  96         struct timeval tv, *tvp;
  97         time_t tvec, start;
  98         char obuf[BUFSIZ];
  99         char ibuf[BUFSIZ];
 100         fd_set rfd;
 101         int aflg, Fflg, kflg, pflg, ch, k, n;
 102         int flushtime, readstdin;
 103         int fm_fd, fm_log;
 104
 105         aflg = Fflg = kflg = pflg = 0;
 106         usesleep = 1;
 107         rawout = 0;
 108         flushtime = 30;
 109         fm_fd = -1;     /* Shut up stupid "may be used uninitialized" GCC
 110                            warning. (not needed w/clang) */
 111
 112         while ((ch = getopt(argc, argv, "adFfkpqrt:")) != -1)
 113                 switch(ch) {
 114                 case 'a':
 115                         aflg = 1;
 116                         break;
 117                 case 'd':
 118                         usesleep = 0;
 119                         break;
 120                 case 'F':
 121                         Fflg = 1;
 122                         break;
 123                 case 'f':
 124                         fflg = 1;
 125                         break;
 126                 case 'k':
 127                         kflg = 1;
 128                         break;
 129                 case 'p':
 130                         pflg = 1;
 131                         break;
 132                 case 'q':
 133                         qflg = 1;
 134                         break;
 135                 case 'r':
 136                         rawout = 1;
 137                         break;
 138                 case 't':
 139                         flushtime = atoi(optarg);
 140                         if (flushtime < 0)
 141                                 err(1, "invalid flush time %d", flushtime);
 142                         break;
 143                 case '?':
 144                 default:
 145                         usage();
 146                 }
 147         argc -= optind;
 148         argv += optind;
 149
 150         if (argc > 0) {
 151                 fname = argv[0];
 152                 argv++;
 153                 argc--;
 154         } else
 155                 fname = "typescript";
 156
 157         if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL)
 158                 err(1, "%s", fname);
 159
 160         if (fflg) {
 161                 asprintf(&fmfname, "%s.filemon", fname);
 162                 if (!fmfname)
 163                         err(1, "%s.filemon", fname);
 164                 if ((fm_fd = open("/dev/filemon", O_RDWR)) == -1)
 165                         err(1, "open(\"/dev/filemon\", O_RDWR)");
 166                 if ((fm_log = open(fmfname, O_WRONLY | O_CREAT | O_TRUNC,
 167                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1)
 168                         err(1, "open(%s)", fmfname);
 169                 if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) < 0)
 170                         err(1, "Cannot set filemon log file descriptor");
 171
 172                 /* Set up these two fd's to close on exec. */
 173                 (void)fcntl(fm_fd, F_SETFD, FD_CLOEXEC);
 174                 (void)fcntl(fm_log, F_SETFD, FD_CLOEXEC);
 175         }
 176
 177         if (pflg)
 178                 playback(fscript);
 179
 180         if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
 181                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 182                         err(1, "tcgetattr");
 183                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 184                         err(1, "ioctl");
 185                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 186                         err(1, "openpty");
 187         } else {
 188                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 189                         err(1, "openpty");
 190         }
 191
 192         if (rawout)
 193                 record(fscript, NULL, 0, 's');
 194
 195         if (!qflg) {
 196                 tvec = time(NULL);
 197                 (void)printf("Script started, output file is %s\n", fname);
 198                 if (!rawout) {
 199                         (void)fprintf(fscript, "Script started on %s",
 200                             ctime(&tvec));
 201                         if (argv[0]) {
 202                                 fprintf(fscript, "command: ");
 203                                 for (k = 0 ; argv[k] ; ++k)
 204                                         fprintf(fscript, "%s%s", k ? " " : "",
 205                                                 argv[k]);
 206                                 fprintf(fscript, "\n");
 207                         }
 208                 }
 209                 fflush(fscript);
 210                 if (fflg) {
 211                         (void)printf("Filemon started, output file is %s\n",
 212                             fmfname);
 213                 }
 214         }
 215         if (ttyflg) {
 216                 rtt = tt;
 217                 cfmakeraw(&rtt);
 218                 rtt.c_lflag &= ~ECHO;
 219                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 220         }
 221
 222         child = fork();
 223         if (child < 0) {
 224                 warn("fork");
 225                 done(1);
 226         }
 227         if (child == 0)
 228                 doshell(argv);
 229         close(slave);
 230
 231         if (fflg && ioctl(fm_fd, FILEMON_SET_PID, &child) < 0)
 232                 err(1, "Cannot set filemon PID");
 233
 234         start = tvec = time(0);
 235         readstdin = 1;
 236         for (;;) {
 237                 FD_ZERO(&rfd);
 238                 FD_SET(master, &rfd);
 239                 if (readstdin)
 240                         FD_SET(STDIN_FILENO, &rfd);
 241                 if ((!readstdin && ttyflg) || flushtime > 0) {
 242                         tv.tv_sec = !readstdin && ttyflg ? 1 :
 243                             flushtime - (tvec - start);
 244                         tv.tv_usec = 0;
 245                         tvp = &tv;
 246                         readstdin = 1;
 247                 } else {
 248                         tvp = NULL;
 249                 }
 250                 n = select(master + 1, &rfd, 0, 0, tvp);
 251                 if (n < 0 && errno != EINTR)
 252                         break;
 253                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 254                         cc = read(STDIN_FILENO, ibuf, BUFSIZ);
 255                         if (cc < 0)
 256                                 break;
 257                         if (cc == 0) {
 258                                 if (tcgetattr(master, &stt) == 0 &&
 259                                     (stt.c_lflag & ICANON) != 0) {
 260                                         (void)write(master, &stt.c_cc[VEOF], 1);
 261                                 }
 262                                 readstdin = 0;
 263                         }
 264                         if (cc > 0) {
 265                                 if (rawout)
 266                                         record(fscript, ibuf, cc, 'i');
 267                                 (void)write(master, ibuf, cc);
 268                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 269                                     ((stt.c_lflag & ECHO) == 0)) {
 270                                         (void)fwrite(ibuf, 1, cc, fscript);
 271                                 }
 272                         }
 273                 }
 274                 if (n > 0 && FD_ISSET(master, &rfd)) {
 275                         cc = read(master, obuf, sizeof (obuf));
 276                         if (cc <= 0)
 277                                 break;
 278                         (void)write(STDOUT_FILENO, obuf, cc);
 279                         if (rawout)
 280                                 record(fscript, obuf, cc, 'o');
 281                         else
 282                                 (void)fwrite(obuf, 1, cc, fscript);
 283                 }
 284                 tvec = time(0);
 285                 if (tvec - start >= flushtime) {
 286                         fflush(fscript);
 287                         start = tvec;
 288                 }
 289                 if (Fflg)
 290                         fflush(fscript);
 291         }
 292         finish();
 293         done(0);
 294 }
 295
 296 static void
 297 usage(void)
 298 {
 299         (void)fprintf(stderr,
 300             "usage: script [-adfkpqr] [-t time] [file [command ...]]\n");
 301         exit(1);
 302 }
 303
 304 static void
 305 finish(void)
 306 {
 307         int e, status;
 308
 309         if (waitpid(child, &status, 0) == child) {
 310                 if (WIFEXITED(status))
 311                         e = WEXITSTATUS(status);
 312                 else if (WIFSIGNALED(status))
 313                         e = WTERMSIG(status);
 314                 else /* can't happen */
 315                         e = 1;
 316                 done(e);
 317         }
 318 }
 319
 320 static void
 321 doshell(char **av)
 322 {
 323         const char *shell;
 324
 325         shell = getenv("SHELL");
 326         if (shell == NULL)
 327                 shell = _PATH_BSHELL;
 328
 329         (void)close(master);
 330         (void)fclose(fscript);
 331         free(fmfname);
 332         login_tty(slave);
 333         setenv("SCRIPT", fname, 1);
 334         if (av[0]) {
 335                 execvp(av[0], av);
 336                 warn("%s", av[0]);
 337         } else {
 338                 execl(shell, shell, "-i", (char *)NULL);
 339                 warn("%s", shell);
 340         }
 341         fail();
 342 }
 343
 344 static void
 345 fail(void)
 346 {
 347         (void)kill(0, SIGTERM);
 348         done(1);
 349 }
 350
 351 static void
 352 done(int eno)
 353 {
 354         time_t tvec;
 355
 356         if (ttyflg)
 357                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 358         tvec = time(NULL);
 359         if (rawout)
 360                 record(fscript, NULL, 0, 'e');
 361         if (!qflg) {
 362                 if (!rawout)
 363                         (void)fprintf(fscript,"\nScript done on %s",
 364                             ctime(&tvec));
 365                 (void)printf("\nScript done, output file is %s\n", fname);
 366                 if (fflg) {
 367                         (void)printf("Filemon done, output file is %s\n",
 368                             fmfname);
 369                 }
 370         }
 371         (void)fclose(fscript);
 372         (void)close(master);
 373         exit(eno);
 374 }
 375
 376 static void
 377 record(FILE *fp, char *buf, size_t cc, int direction)
 378 {
 379         struct iovec iov[2];
 380         struct stamp stamp;
 381         struct timeval tv;
 382
 383         (void)gettimeofday(&tv, NULL);
 384         stamp.scr_len = cc;
 385         stamp.scr_sec = tv.tv_sec;
 386         stamp.scr_usec = tv.tv_usec;
 387         stamp.scr_direction = direction;
 388         iov[0].iov_len = sizeof(stamp);
 389         iov[0].iov_base = &stamp;
 390         iov[1].iov_len = cc;
 391         iov[1].iov_base = buf;
 392         if (writev(fileno(fp), &iov[0], 2) == -1)
 393                 err(1, "writev");
 394 }
 395
 396 static void
 397 consume(FILE *fp, off_t len, char *buf, int reg)
 398 {
 399         size_t l;
 400
 401         if (reg) {
 402                 if (fseeko(fp, len, SEEK_CUR) == -1)
 403                         err(1, NULL);
 404         }
 405         else {
 406                 while (len > 0) {
 407                         l = MIN(DEF_BUF, len);
 408                         if (fread(buf, sizeof(char), l, fp) != l)
 409                                 err(1, "cannot read buffer");
 410                         len -= l;
 411                 }
 412         }
 413 }
 414
 415 #define swapstamp(stamp) do { \
 416         if (stamp.scr_direction > 0xff) { \
 417                 stamp.scr_len = bswap64(stamp.scr_len); \
 418                 stamp.scr_sec = bswap64(stamp.scr_sec); \
 419                 stamp.scr_usec = bswap32(stamp.scr_usec); \
 420                 stamp.scr_direction = bswap32(stamp.scr_direction); \
 421         } \
 422 } while (0/*CONSTCOND*/)
 423
 424 static void
 425 playback(FILE *fp)
 426 {
 427         struct timespec tsi, tso;
 428         struct stamp stamp;
 429         struct stat pst;
 430         char buf[DEF_BUF];
 431         off_t nread, save_len;
 432         size_t l;
 433         time_t tclock;
 434         int reg;
 435
 436         if (fstat(fileno(fp), &pst) == -1)
 437                 err(1, "fstat failed");
 438
 439         reg = S_ISREG(pst.st_mode);
 440
 441         for (nread = 0; !reg || nread < pst.st_size; nread += save_len) {
 442                 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) {
 443                         if (reg)
 444                                 err(1, "reading playback header");
 445                         else
 446                                 break;
 447                 }
 448                 swapstamp(stamp);
 449                 save_len = sizeof(stamp);
 450
 451                 if (reg && stamp.scr_len >
 452                     (uint64_t)(pst.st_size - save_len) - nread)
 453                         errx(1, "invalid stamp");
 454
 455                 save_len += stamp.scr_len;
 456                 tclock = stamp.scr_sec;
 457                 tso.tv_sec = stamp.scr_sec;
 458                 tso.tv_nsec = stamp.scr_usec * 1000;
 459
 460                 switch (stamp.scr_direction) {
 461                 case 's':
 462                         if (!qflg)
 463                             (void)printf("Script started on %s",
 464                                 ctime(&tclock));
 465                         tsi = tso;
 466                         (void)consume(fp, stamp.scr_len, buf, reg);
 467                         break;
 468                 case 'e':
 469                         if (!qflg)
 470                                 (void)printf("\nScript done on %s",
 471                                     ctime(&tclock));
 472                         (void)consume(fp, stamp.scr_len, buf, reg);
 473                         break;
 474                 case 'i':
 475                         /* throw input away */
 476                         (void)consume(fp, stamp.scr_len, buf, reg);
 477                         break;
 478                 case 'o':
 479                         tsi.tv_sec = tso.tv_sec - tsi.tv_sec;
 480                         tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec;
 481                         if (tsi.tv_nsec < 0) {
 482                                 tsi.tv_sec -= 1;
 483                                 tsi.tv_nsec += 1000000000;
 484                         }
 485                         if (usesleep)
 486                                 (void)nanosleep(&tsi, NULL);
 487                         tsi = tso;
 488                         while (stamp.scr_len > 0) {
 489                                 l = MIN(DEF_BUF, stamp.scr_len);
 490                                 if (fread(buf, sizeof(char), l, fp) != l)
 491                                         err(1, "cannot read buffer");
 492
 493                                 (void)write(STDOUT_FILENO, buf, l);
 494                                 stamp.scr_len -= l;
 495                         }
 496                         break;
 497                 default:
 498                         errx(1, "invalid direction");
 499                 }
 500         }
 501         (void)fclose(fp);
 502         exit(0);
 503 }