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, kflg, pflg, ch, k, n;
 102         int flushtime, readstdin;
 103         int fm_fd, fm_log;
 104
 105         aflg = 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, "adfkpqrt:")) != -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 'k':
 124                         kflg = 1;
 125                         break;
 126                 case 'p':
 127                         pflg = 1;
 128                         break;
 129                 case 'q':
 130                         qflg = 1;
 131                         break;
 132                 case 'r':
 133                         rawout = 1;
 134                         break;
 135                 case 't':
 136                         flushtime = atoi(optarg);
 137                         if (flushtime < 0)
 138                                 err(1, "invalid flush time %d", flushtime);
 139                         break;
 140                 case '?':
 141                 default:
 142                         usage();
 143                 }
 144         argc -= optind;
 145         argv += optind;
 146
 147         if (argc > 0) {
 148                 fname = argv[0];
 149                 argv++;
 150                 argc--;
 151         } else
 152                 fname = "typescript";
 153
 154         if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL)
 155                 err(1, "%s", fname);
 156
 157         if (fflg) {
 158                 asprintf(&fmfname, "%s.filemon", fname);
 159                 if (!fmfname)
 160                         err(1, "%s.filemon", fname);
 161                 if ((fm_fd = open("/dev/filemon", O_RDWR)) == -1)
 162                         err(1, "open(\"/dev/filemon\", O_RDWR)");
 163                 if ((fm_log = open(fmfname, O_WRONLY | O_CREAT | O_TRUNC,
 164                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1)
 165                         err(1, "open(%s)", fmfname);
 166                 if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) < 0)
 167                         err(1, "Cannot set filemon log file descriptor");
 168
 169                 /* Set up these two fd's to close on exec. */
 170                 (void)fcntl(fm_fd, F_SETFD, FD_CLOEXEC);
 171                 (void)fcntl(fm_log, F_SETFD, FD_CLOEXEC);
 172         }
 173
 174         if (pflg)
 175                 playback(fscript);
 176
 177         if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
 178                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 179                         err(1, "tcgetattr");
 180                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 181                         err(1, "ioctl");
 182                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 183                         err(1, "openpty");
 184         } else {
 185                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 186                         err(1, "openpty");
 187         }
 188
 189         if (rawout)
 190                 record(fscript, NULL, 0, 's');
 191
 192         if (!qflg) {
 193                 tvec = time(NULL);
 194                 (void)printf("Script started, output file is %s\n", fname);
 195                 if (!rawout) {
 196                         (void)fprintf(fscript, "Script started on %s",
 197                             ctime(&tvec));
 198                         if (argv[0]) {
 199                                 fprintf(fscript, "command: ");
 200                                 for (k = 0 ; argv[k] ; ++k)
 201                                         fprintf(fscript, "%s%s", k ? " " : "",
 202                                                 argv[k]);
 203                                 fprintf(fscript, "\n");
 204                         }
 205                 }
 206                 fflush(fscript);
 207                 if (fflg) {
 208                         (void)printf("Filemon started, output file is %s\n",
 209                             fmfname);
 210                 }
 211         }
 212         if (ttyflg) {
 213                 rtt = tt;
 214                 cfmakeraw(&rtt);
 215                 rtt.c_lflag &= ~ECHO;
 216                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 217         }
 218
 219         child = fork();
 220         if (child < 0) {
 221                 warn("fork");
 222                 done(1);
 223         }
 224         if (child == 0)
 225                 doshell(argv);
 226         close(slave);
 227
 228         if (fflg && ioctl(fm_fd, FILEMON_SET_PID, &child) < 0)
 229                 err(1, "Cannot set filemon PID");
 230
 231         start = tvec = time(0);
 232         readstdin = 1;
 233         for (;;) {
 234                 FD_ZERO(&rfd);
 235                 FD_SET(master, &rfd);
 236                 if (readstdin)
 237                         FD_SET(STDIN_FILENO, &rfd);
 238                 if ((!readstdin && ttyflg) || flushtime > 0) {
 239                         tv.tv_sec = !readstdin && ttyflg ? 1 :
 240                             flushtime - (tvec - start);
 241                         tv.tv_usec = 0;
 242                         tvp = &tv;
 243                         readstdin = 1;
 244                 } else {
 245                         tvp = NULL;
 246                 }
 247                 n = select(master + 1, &rfd, 0, 0, tvp);
 248                 if (n < 0 && errno != EINTR)
 249                         break;
 250                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 251                         cc = read(STDIN_FILENO, ibuf, BUFSIZ);
 252                         if (cc < 0)
 253                                 break;
 254                         if (cc == 0) {
 255                                 if (tcgetattr(master, &stt) == 0 &&
 256                                     (stt.c_lflag & ICANON) != 0) {
 257                                         (void)write(master, &stt.c_cc[VEOF], 1);
 258                                 }
 259                                 readstdin = 0;
 260                         }
 261                         if (cc > 0) {
 262                                 if (rawout)
 263                                         record(fscript, ibuf, cc, 'i');
 264                                 (void)write(master, ibuf, cc);
 265                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 266                                     ((stt.c_lflag & ECHO) == 0)) {
 267                                         (void)fwrite(ibuf, 1, cc, fscript);
 268                                 }
 269                         }
 270                 }
 271                 if (n > 0 && FD_ISSET(master, &rfd)) {
 272                         cc = read(master, obuf, sizeof (obuf));
 273                         if (cc <= 0)
 274                                 break;
 275                         (void)write(STDOUT_FILENO, obuf, cc);
 276                         if (rawout)
 277                                 record(fscript, obuf, cc, 'o');
 278                         else
 279                                 (void)fwrite(obuf, 1, cc, fscript);
 280                 }
 281                 tvec = time(0);
 282                 if (tvec - start >= flushtime) {
 283                         fflush(fscript);
 284                         start = tvec;
 285                 }
 286         }
 287         finish();
 288         done(0);
 289 }
 290
 291 static void
 292 usage(void)
 293 {
 294         (void)fprintf(stderr,
 295             "usage: script [-adfkpqr] [-t time] [file [command ...]]\n");
 296         exit(1);
 297 }
 298
 299 static void
 300 finish(void)
 301 {
 302         int e, status;
 303
 304         if (waitpid(child, &status, 0) == child) {
 305                 if (WIFEXITED(status))
 306                         e = WEXITSTATUS(status);
 307                 else if (WIFSIGNALED(status))
 308                         e = WTERMSIG(status);
 309                 else /* can't happen */
 310                         e = 1;
 311                 done(e);
 312         }
 313 }
 314
 315 static void
 316 doshell(char **av)
 317 {
 318         const char *shell;
 319
 320         shell = getenv("SHELL");
 321         if (shell == NULL)
 322                 shell = _PATH_BSHELL;
 323
 324         (void)close(master);
 325         (void)fclose(fscript);
 326         free(fmfname);
 327         login_tty(slave);
 328         setenv("SCRIPT", fname, 1);
 329         if (av[0]) {
 330                 execvp(av[0], av);
 331                 warn("%s", av[0]);
 332         } else {
 333                 execl(shell, shell, "-i", (char *)NULL);
 334                 warn("%s", shell);
 335         }
 336         fail();
 337 }
 338
 339 static void
 340 fail(void)
 341 {
 342         (void)kill(0, SIGTERM);
 343         done(1);
 344 }
 345
 346 static void
 347 done(int eno)
 348 {
 349         time_t tvec;
 350
 351         if (ttyflg)
 352                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 353         tvec = time(NULL);
 354         if (rawout)
 355                 record(fscript, NULL, 0, 'e');
 356         if (!qflg) {
 357                 if (!rawout)
 358                         (void)fprintf(fscript,"\nScript done on %s",
 359                             ctime(&tvec));
 360                 (void)printf("\nScript done, output file is %s\n", fname);
 361                 if (fflg) {
 362                         (void)printf("Filemon done, output file is %s\n",
 363                             fmfname);
 364                 }
 365         }
 366         (void)fclose(fscript);
 367         (void)close(master);
 368         exit(eno);
 369 }
 370
 371 static void
 372 record(FILE *fp, char *buf, size_t cc, int direction)
 373 {
 374         struct iovec iov[2];
 375         struct stamp stamp;
 376         struct timeval tv;
 377
 378         (void)gettimeofday(&tv, NULL);
 379         stamp.scr_len = cc;
 380         stamp.scr_sec = tv.tv_sec;
 381         stamp.scr_usec = tv.tv_usec;
 382         stamp.scr_direction = direction;
 383         iov[0].iov_len = sizeof(stamp);
 384         iov[0].iov_base = &stamp;
 385         iov[1].iov_len = cc;
 386         iov[1].iov_base = buf;
 387         if (writev(fileno(fp), &iov[0], 2) == -1)
 388                 err(1, "writev");
 389 }
 390
 391 static void
 392 consume(FILE *fp, off_t len, char *buf, int reg)
 393 {
 394         size_t l;
 395
 396         if (reg) {
 397                 if (fseeko(fp, len, SEEK_CUR) == -1)
 398                         err(1, NULL);
 399         }
 400         else {
 401                 while (len > 0) {
 402                         l = MIN(DEF_BUF, len);
 403                         if (fread(buf, sizeof(char), l, fp) != l)
 404                                 err(1, "cannot read buffer");
 405                         len -= l;
 406                 }
 407         }
 408 }
 409
 410 #define swapstamp(stamp) do { \
 411         if (stamp.scr_direction > 0xff) { \
 412                 stamp.scr_len = bswap64(stamp.scr_len); \
 413                 stamp.scr_sec = bswap64(stamp.scr_sec); \
 414                 stamp.scr_usec = bswap32(stamp.scr_usec); \
 415                 stamp.scr_direction = bswap32(stamp.scr_direction); \
 416         } \
 417 } while (0/*CONSTCOND*/)
 418
 419 static void
 420 playback(FILE *fp)
 421 {
 422         struct timespec tsi, tso;
 423         struct stamp stamp;
 424         struct stat pst;
 425         char buf[DEF_BUF];
 426         off_t nread, save_len;
 427         size_t l;
 428         time_t tclock;
 429         int reg;
 430
 431         if (fstat(fileno(fp), &pst) == -1)
 432                 err(1, "fstat failed");
 433
 434         reg = S_ISREG(pst.st_mode);
 435
 436         for (nread = 0; !reg || nread < pst.st_size; nread += save_len) {
 437                 if (fread(&stamp, sizeof(stamp), 1, fp) != 1) {
 438                         if (reg)
 439                                 err(1, "reading playback header");
 440                         else
 441                                 break;
 442                 }
 443                 swapstamp(stamp);
 444                 save_len = sizeof(stamp);
 445
 446                 if (reg && stamp.scr_len >
 447                     (uint64_t)(pst.st_size - save_len) - nread)
 448                         errx(1, "invalid stamp");
 449
 450                 save_len += stamp.scr_len;
 451                 tclock = stamp.scr_sec;
 452                 tso.tv_sec = stamp.scr_sec;
 453                 tso.tv_nsec = stamp.scr_usec * 1000;
 454
 455                 switch (stamp.scr_direction) {
 456                 case 's':
 457                         if (!qflg)
 458                             (void)printf("Script started on %s",
 459                                 ctime(&tclock));
 460                         tsi = tso;
 461                         (void)consume(fp, stamp.scr_len, buf, reg);
 462                         break;
 463                 case 'e':
 464                         if (!qflg)
 465                                 (void)printf("\nScript done on %s",
 466                                     ctime(&tclock));
 467                         (void)consume(fp, stamp.scr_len, buf, reg);
 468                         break;
 469                 case 'i':
 470                         /* throw input away */
 471                         (void)consume(fp, stamp.scr_len, buf, reg);
 472                         break;
 473                 case 'o':
 474                         tsi.tv_sec = tso.tv_sec - tsi.tv_sec;
 475                         tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec;
 476                         if (tsi.tv_nsec < 0) {
 477                                 tsi.tv_sec -= 1;
 478                                 tsi.tv_nsec += 1000000000;
 479                         }
 480                         if (usesleep)
 481                                 (void)nanosleep(&tsi, NULL);
 482                         tsi = tso;
 483                         while (stamp.scr_len > 0) {
 484                                 l = MIN(DEF_BUF, stamp.scr_len);
 485                                 if (fread(buf, sizeof(char), l, fp) != l)
 486                                         err(1, "cannot read buffer");
 487
 488                                 (void)write(STDOUT_FILENO, buf, l);
 489                                 stamp.scr_len -= l;
 490                         }
 491                         break;
 492                 default:
 493                         errx(1, "invalid direction");
 494                 }
 495         }
 496         (void)fclose(fp);
 497         exit(0);
 498 }