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, showexit;
  78
  79 static struct termios tt;
  80
  81 static void done(int) __dead2;
  82 static void doshell(char **);
  83 static void finish(void);
  84 static void record(FILE *, char *, size_t, int);
  85 static void consume(FILE *, off_t, char *, int);
  86 static void playback(FILE *) __dead2;
  87 static void usage(void);
  88
  89 int
  90 main(int argc, char *argv[])
  91 {
  92         int cc;
  93         struct termios rtt, stt;
  94         struct winsize win;
  95         struct timeval tv, *tvp;
  96         time_t tvec, start;
  97         char obuf[BUFSIZ];
  98         char ibuf[BUFSIZ];
  99         fd_set rfd;
 100         int aflg, Fflg, kflg, pflg, ch, k, n;
 101         int flushtime, readstdin;
 102         int fm_fd, fm_log;
 103
 104         aflg = Fflg = kflg = pflg = 0;
 105         usesleep = 1;
 106         rawout = 0;
 107         flushtime = 30;
 108         fm_fd = -1;     /* Shut up stupid "may be used uninitialized" GCC
 109                            warning. (not needed w/clang) */
 110         showexit = 0;
 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                                 showexit = 1;
 203                                 fprintf(fscript, "Command: ");
 204                                 for (k = 0 ; argv[k] ; ++k)
 205                                         fprintf(fscript, "%s%s", k ? " " : "",
 206                                                 argv[k]);
 207                                 fprintf(fscript, "\n");
 208                         }
 209                 }
 210                 fflush(fscript);
 211                 if (fflg) {
 212                         (void)printf("Filemon started, output file is %s\n",
 213                             fmfname);
 214                 }
 215         }
 216         if (ttyflg) {
 217                 rtt = tt;
 218                 cfmakeraw(&rtt);
 219                 rtt.c_lflag &= ~ECHO;
 220                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 221         }
 222
 223         child = fork();
 224         if (child < 0) {
 225                 warn("fork");
 226                 done(1);
 227         }
 228         if (child == 0) {
 229                 if (fflg) {
 230                         int pid;
 231
 232                         pid = getpid();
 233                         if (ioctl(fm_fd, FILEMON_SET_PID, &pid) < 0)
 234                                 err(1, "Cannot set filemon PID");
 235                 }
 236
 237                 doshell(argv);
 238         }
 239         close(slave);
 240
 241         start = tvec = time(0);
 242         readstdin = 1;
 243         for (;;) {
 244                 FD_ZERO(&rfd);
 245                 FD_SET(master, &rfd);
 246                 if (readstdin)
 247                         FD_SET(STDIN_FILENO, &rfd);
 248                 if (!readstdin && ttyflg) {
 249                         tv.tv_sec = 1;
 250                         tv.tv_usec = 0;
 251                         tvp = &tv;
 252                         readstdin = 1;
 253                 } else if (flushtime > 0) {
 254                         tv.tv_sec = flushtime - (tvec - start);
 255                         tv.tv_usec = 0;
 256                         tvp = &tv;
 257                 } else {
 258                         tvp = NULL;
 259                 }
 260                 n = select(master + 1, &rfd, 0, 0, tvp);
 261                 if (n < 0 && errno != EINTR)
 262                         break;
 263                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 264                         cc = read(STDIN_FILENO, ibuf, BUFSIZ);
 265                         if (cc < 0)
 266                                 break;
 267                         if (cc == 0) {
 268                                 if (tcgetattr(master, &stt) == 0 &&
 269                                     (stt.c_lflag & ICANON) != 0) {
 270                                         (void)write(master, &stt.c_cc[VEOF], 1);
 271                                 }
 272                                 readstdin = 0;
 273                         }
 274                         if (cc > 0) {
 275                                 if (rawout)
 276                                         record(fscript, ibuf, cc, 'i');
 277                                 (void)write(master, ibuf, cc);
 278                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 279                                     ((stt.c_lflag & ECHO) == 0)) {
 280                                         (void)fwrite(ibuf, 1, cc, fscript);
 281                                 }
 282                         }
 283                 }
 284                 if (n > 0 && FD_ISSET(master, &rfd)) {
 285                         cc = read(master, obuf, sizeof (obuf));
 286                         if (cc <= 0)
 287                                 break;
 288                         (void)write(STDOUT_FILENO, obuf, cc);
 289                         if (rawout)
 290                                 record(fscript, obuf, cc, 'o');
 291                         else
 292                                 (void)fwrite(obuf, 1, cc, fscript);
 293                 }
 294                 tvec = time(0);
 295                 if (tvec - start >= flushtime) {
 296                         fflush(fscript);
 297                         start = tvec;
 298                 }
 299                 if (Fflg)
 300                         fflush(fscript);
 301         }
 302         finish();
 303         done(0);
 304 }
 305
 306 static void
 307 usage(void)
 308 {
 309         (void)fprintf(stderr,
 310             "usage: script [-adfkpqr] [-t time] [file [command ...]]\n");
 311         exit(1);
 312 }
 313
 314 static void
 315 finish(void)
 316 {
 317         int e, status;
 318
 319         if (waitpid(child, &status, 0) == child) {
 320                 if (WIFEXITED(status))
 321                         e = WEXITSTATUS(status);
 322                 else if (WIFSIGNALED(status))
 323                         e = WTERMSIG(status);
 324                 else /* can't happen */
 325                         e = 1;
 326                 done(e);
 327         }
 328 }
 329
 330 static void
 331 doshell(char **av)
 332 {
 333         const char *shell;
 334
 335         shell = getenv("SHELL");
 336         if (shell == NULL)
 337                 shell = _PATH_BSHELL;
 338
 339         (void)close(master);
 340         (void)fclose(fscript);
 341         free(fmfname);
 342         login_tty(slave);
 343         setenv("SCRIPT", fname, 1);
 344         if (av[0]) {
 345                 execvp(av[0], av);
 346                 warn("%s", av[0]);
 347         } else {
 348                 execl(shell, shell, "-i", (char *)NULL);
 349                 warn("%s", shell);
 350         }
 351         exit(1);
 352 }
 353
 354 static void
 355 done(int eno)
 356 {
 357         time_t tvec;
 358
 359         if (ttyflg)
 360                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 361         tvec = time(NULL);
 362         if (rawout)
 363                 record(fscript, NULL, 0, 'e');
 364         if (!qflg) {
 365                 if (!rawout) {
 366                         if (showexit)
 367                                 (void)fprintf(fscript, "\nCommand exit status:"
 368                                     " %d", eno);
 369                         (void)fprintf(fscript,"\nScript done on %s",
 370                             ctime(&tvec));
 371                 }
 372                 (void)printf("\nScript done, output file is %s\n", fname);
 373                 if (fflg) {
 374                         (void)printf("Filemon done, output file is %s\n",
 375                             fmfname);
 376                 }
 377         }
 378         (void)fclose(fscript);
 379         (void)close(master);
 380         exit(eno);
 381 }
 382
 383 static void
 384 record(FILE *fp, char *buf, size_t cc, int direction)
 385 {
 386         struct iovec iov[2];
 387         struct stamp stamp;
 388         struct timeval tv;
 389
 390         (void)gettimeofday(&tv, NULL);
 391         stamp.scr_len = cc;
 392         stamp.scr_sec = tv.tv_sec;
 393         stamp.scr_usec = tv.tv_usec;
 394         stamp.scr_direction = direction;
 395         iov[0].iov_len = sizeof(stamp);
 396         iov[0].iov_base = &stamp;
 397         iov[1].iov_len = cc;
 398         iov[1].iov_base = buf;
 399         if (writev(fileno(fp), &iov[0], 2) == -1)
 400                 err(1, "writev");
 401 }
 402
 403 static void
 404 consume(FILE *fp, off_t len, char *buf, int reg)
 405 {
 406         size_t l;
 407
 408         if (reg) {
 409                 if (fseeko(fp, len, SEEK_CUR) == -1)
 410                         err(1, NULL);
 411         }
 412         else {
 413                 while (len > 0) {
 414                         l = MIN(DEF_BUF, len);
 415                         if (fread(buf, sizeof(char), l, fp) != l)
 416                                 err(1, "cannot read buffer");
 417                         len -= l;
 418                 }
 419         }
 420 }
 421
 422 #define swapstamp(stamp) do { \
 423         if (stamp.scr_direction > 0xff) { \
 424                 stamp.scr_len = bswap64(stamp.scr_len); \
 425                 stamp.scr_sec = bswap64(stamp.scr_sec); \
 426                 stamp.scr_usec = bswap32(stamp.scr_usec); \
 427                 stamp.scr_direction = bswap32(stamp.scr_direction); \
 428         } \
 429 } while (0/*CONSTCOND*/)
 430
 431 static void
 432 playback(FILE *fp)
 433 {
 434         struct timespec tsi, tso;
 435         struct stamp stamp;
 436         struct stat pst;
 437         char buf[DEF_BUF];
 438         off_t nread, save_len;
 439         size_t l;
 440         time_t tclock;
 441         int reg;
 442
 443         if (fstat(fileno(fp), &pst) == -1)
 444                 err(1, "fstat failed");
 445
 446         reg = S_ISREG(pst.st_mode);
 447
 448         for (nread = 0; !reg || nread < pst.st_size; nread += save_len) {
 449                 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) {
 450                         if (reg)
 451                                 err(1, "reading playback header");
 452                         else
 453                                 break;
 454                 }
 455                 swapstamp(stamp);
 456                 save_len = sizeof(stamp);
 457
 458                 if (reg && stamp.scr_len >
 459                     (uint64_t)(pst.st_size - save_len) - nread)
 460                         errx(1, "invalid stamp");
 461
 462                 save_len += stamp.scr_len;
 463                 tclock = stamp.scr_sec;
 464                 tso.tv_sec = stamp.scr_sec;
 465                 tso.tv_nsec = stamp.scr_usec * 1000;
 466
 467                 switch (stamp.scr_direction) {
 468                 case 's':
 469                         if (!qflg)
 470                             (void)printf("Script started on %s",
 471                                 ctime(&tclock));
 472                         tsi = tso;
 473                         (void)consume(fp, stamp.scr_len, buf, reg);
 474                         break;
 475                 case 'e':
 476                         if (!qflg)
 477                                 (void)printf("\nScript done on %s",
 478                                     ctime(&tclock));
 479                         (void)consume(fp, stamp.scr_len, buf, reg);
 480                         break;
 481                 case 'i':
 482                         /* throw input away */
 483                         (void)consume(fp, stamp.scr_len, buf, reg);
 484                         break;
 485                 case 'o':
 486                         tsi.tv_sec = tso.tv_sec - tsi.tv_sec;
 487                         tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec;
 488                         if (tsi.tv_nsec < 0) {
 489                                 tsi.tv_sec -= 1;
 490                                 tsi.tv_nsec += 1000000000;
 491                         }
 492                         if (usesleep)
 493                                 (void)nanosleep(&tsi, NULL);
 494                         tsi = tso;
 495                         while (stamp.scr_len > 0) {
 496                                 l = MIN(DEF_BUF, stamp.scr_len);
 497                                 if (fread(buf, sizeof(char), l, fp) != l)
 498                                         err(1, "cannot read buffer");
 499
 500                                 (void)write(STDOUT_FILENO, buf, l);
 501                                 stamp.scr_len -= l;
 502                         }
 503                         break;
 504                 default:
 505                         errx(1, "invalid direction");
 506                 }
 507         }
 508         (void)fclose(fp);
 509         exit(0);
 510 }