text: /*
   * Copyright (c) 2010, 2012  David E. O'Brien
   * Copyright (c) 1980, 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/param.h>
  __FBSDID("$FreeBSD: soc2013/dpl/head/usr.bin/script/script.c 243318 2012-10-26 15:56:28Z obrien $");
  #ifndef lint
  static const char copyright[] =
  "@(#) Copyright (c) 1980, 1992, 1993\n\
  	The Regents of the University of California.  All rights reserved.\n";
  #endif
  #ifndef lint
  static const char sccsid[] = "@(#)script.c	8.1 (Berkeley) 6/6/93";
  #endif
  
  #include <sys/wait.h>
  #include <sys/stat.h>
  #include <sys/ioctl.h>
  #include <sys/time.h>
  #include <sys/uio.h>
  #include <sys/endian.h>
  #include <dev/filemon/filemon.h>
  
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <libutil.h>
  #include <paths.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <termios.h>
  #include <unistd.h>
  
  #define DEF_BUF 65536
  
  struct stamp {
  	uint64_t scr_len;	/* amount of data */
  	uint64_t scr_sec;	/* time it arrived in seconds... */
  	uint32_t scr_usec;	/* ...and microseconds */
  	uint32_t scr_direction; /* 'i', 'o', etc (also indicates endianness) */
  };
  
  static FILE *fscript;
  static int master, slave;
  static int child;
  static const char *fname;
  static char *fmfname;
  static int fflg, qflg, ttyflg;
  static int usesleep, rawout;
  
  static struct termios tt;
  
  static void done(int) __dead2;
  static void doshell(char **);
  static void fail(void);
  static void finish(void);
  static void record(FILE *, char *, size_t, int);
  static void consume(FILE *, off_t, char *, int);
  static void playback(FILE *) __dead2;
  static void usage(void);
  
  int
  main(int argc, char *argv[])
  {
  	int cc;
  	struct termios rtt, stt;
  	struct winsize win;
  	struct timeval tv, *tvp;
  	time_t tvec, start;
  	char obuf[BUFSIZ];
  	char ibuf[BUFSIZ];
  	fd_set rfd;
  	int aflg, kflg, pflg, ch, k, n;
  	int flushtime, readstdin;
  	int fm_fd, fm_log;
  
  	aflg = kflg = pflg = 0;
  	usesleep = 1;
  	rawout = 0;
  	flushtime = 30;
  	fm_fd = -1;	/* Shut up stupid "may be used uninitialized" GCC
  			   warning. (not needed w/clang) */
  
  	while ((ch = getopt(argc, argv, "adfkpqrt:")) != -1)
  		switch(ch) {
  		case 'a':
  			aflg = 1;
  			break;
  		case 'd':
  			usesleep = 0;
  			break;
  		case 'f':
  			fflg = 1;
  			break;
  		case 'k':
  			kflg = 1;
  			break;
  		case 'p':
  			pflg = 1;
  			break;
  		case 'q':
  			qflg = 1;
  			break;
  		case 'r':
  			rawout = 1;
  			break;
  		case 't':
  			flushtime = atoi(optarg);
  			if (flushtime < 0)
  				err(1, "invalid flush time %d", flushtime);
  			break;
  		case '?':
  		default:
  			usage();
  		}
  	argc -= optind;
  	argv += optind;
  
  	if (argc > 0) {
  		fname = argv[0];
  		argv++;
  		argc--;
  	} else
  		fname = "typescript";
  
  	if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL)
  		err(1, "%s", fname);
  
  	if (fflg) {
  		asprintf(&fmfname, "%s.filemon", fname);
  		if (!fmfname)
  			err(1, "%s.filemon", fname);
  		if ((fm_fd = open("/dev/filemon", O_RDWR)) == -1)
  			err(1, "open(\"/dev/filemon\", O_RDWR)");
  		if ((fm_log = open(fmfname, O_WRONLY | O_CREAT | O_TRUNC,
  		    S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1)
  			err(1, "open(%s)", fmfname);
  		if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) < 0)
  			err(1, "Cannot set filemon log file descriptor");
  
  		/* Set up these two fd's to close on exec. */
  		(void)fcntl(fm_fd, F_SETFD, FD_CLOEXEC);
  		(void)fcntl(fm_log, F_SETFD, FD_CLOEXEC);
  	}
  
  	if (pflg)
  		playback(fscript);
  
  	if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
  		if (tcgetattr(STDIN_FILENO, &tt) == -1)
  			err(1, "tcgetattr");
  		if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
  			err(1, "ioctl");
  		if (openpty(&master, &slave, NULL, &tt, &win) == -1)
  			err(1, "openpty");
  	} else {
  		if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
  			err(1, "openpty");
  	}
  
  	if (rawout)
  		record(fscript, NULL, 0, 's');
  
  	if (!qflg) {
  		tvec = time(NULL);
  		(void)printf("Script started, output file is %s\n", fname);
  		if (!rawout) {
  			(void)fprintf(fscript, "Script started on %s",
  			    ctime(&tvec));
  			if (argv[0]) {
  				fprintf(fscript, "command: ");
  				for (k = 0 ; argv[k] ; ++k)
  					fprintf(fscript, "%s%s", k ? " " : "",
  						argv[k]);
  				fprintf(fscript, "\n");
  			}
  		}
  		fflush(fscript);
  		if (fflg) {
  			(void)printf("Filemon started, output file is %s\n",
  			    fmfname);
  		}
  	}
  	if (ttyflg) {
  		rtt = tt;
  		cfmakeraw(&rtt);
  		rtt.c_lflag &= ~ECHO;
  		(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
  	}
  
  	child = fork();
  	if (child < 0) {
  		warn("fork");
  		done(1);
  	}
  	if (child == 0)
  		doshell(argv);
  	close(slave);
  
  	if (fflg && ioctl(fm_fd, FILEMON_SET_PID, &child) < 0)
  		err(1, "Cannot set filemon PID");
  
  	start = tvec = time(0);
  	readstdin = 1;
  	for (;;) {
  		FD_ZERO(&rfd);
  		FD_SET(master, &rfd);
  		if (readstdin)
  			FD_SET(STDIN_FILENO, &rfd);
  		if ((!readstdin && ttyflg) || flushtime > 0) {
  			tv.tv_sec = !readstdin && ttyflg ? 1 :
  			    flushtime - (tvec - start);
  			tv.tv_usec = 0;
  			tvp = &tv;
  			readstdin = 1;
  		} else {
  			tvp = NULL;
  		}
  		n = select(master + 1, &rfd, 0, 0, tvp);
  		if (n < 0 && errno != EINTR)
  			break;
  		if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
  			cc = read(STDIN_FILENO, ibuf, BUFSIZ);
  			if (cc < 0)
  				break;
  			if (cc == 0) {
  				if (tcgetattr(master, &stt) == 0 &&
  				    (stt.c_lflag & ICANON) != 0) {
  					(void)write(master, &stt.c_cc[VEOF], 1);
  				}
  				readstdin = 0;
  			}
  			if (cc > 0) {
  				if (rawout)
  					record(fscript, ibuf, cc, 'i');
  				(void)write(master, ibuf, cc);
  				if (kflg && tcgetattr(master, &stt) >= 0 &&
  				    ((stt.c_lflag & ECHO) == 0)) {
  					(void)fwrite(ibuf, 1, cc, fscript);
  				}
  			}
  		}
  		if (n > 0 && FD_ISSET(master, &rfd)) {
  			cc = read(master, obuf, sizeof (obuf));
  			if (cc <= 0)
  				break;
  			(void)write(STDOUT_FILENO, obuf, cc);
  			if (rawout)
  				record(fscript, obuf, cc, 'o');
  			else
  				(void)fwrite(obuf, 1, cc, fscript);
  		}
  		tvec = time(0);
  		if (tvec - start >= flushtime) {
  			fflush(fscript);
  			start = tvec;
  		}
  	}
  	finish();
  	done(0);
  }
  
  static void
  usage(void)
  {
  	(void)fprintf(stderr,
  	    "usage: script [-adfkpqr] [-t time] [file [command ...]]\n");
  	exit(1);
  }
  
  static void
  finish(void)
  {
  	int e, status;
  
  	if (waitpid(child, &status, 0) == child) {
  		if (WIFEXITED(status))
  			e = WEXITSTATUS(status);
  		else if (WIFSIGNALED(status))
  			e = WTERMSIG(status);
  		else /* can't happen */
  			e = 1;
  		done(e);
  	}
  }
  
  static void
  doshell(char **av)
  {
  	const char *shell;
  
  	shell = getenv("SHELL");
  	if (shell == NULL)
  		shell = _PATH_BSHELL;
  
  	(void)close(master);
  	(void)fclose(fscript);
  	free(fmfname);
  	login_tty(slave);
  	setenv("SCRIPT", fname, 1);
  	if (av[0]) {
  		execvp(av[0], av);
  		warn("%s", av[0]);
  	} else {
  		execl(shell, shell, "-i", (char *)NULL);
  		warn("%s", shell);
  	}
  	fail();
  }
  
  static void
  fail(void)
  {
  	(void)kill(0, SIGTERM);
  	done(1);
  }
  
  static void
  done(int eno)
  {
  	time_t tvec;
  
  	if (ttyflg)
  		(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
  	tvec = time(NULL);
  	if (rawout)
  		record(fscript, NULL, 0, 'e');
  	if (!qflg) {
  		if (!rawout)
  			(void)fprintf(fscript,"\nScript done on %s",
  			    ctime(&tvec));
  		(void)printf("\nScript done, output file is %s\n", fname);
  		if (fflg) {
  			(void)printf("Filemon done, output file is %s\n",
  			    fmfname);
  		}
  	}
  	(void)fclose(fscript);
  	(void)close(master);
  	exit(eno);
  }
  
  static void
  record(FILE *fp, char *buf, size_t cc, int direction)
  {
  	struct iovec iov[2];
  	struct stamp stamp;
  	struct timeval tv;
  
  	(void)gettimeofday(&tv, NULL);
  	stamp.scr_len = cc;
  	stamp.scr_sec = tv.tv_sec;
  	stamp.scr_usec = tv.tv_usec;
  	stamp.scr_direction = direction;
  	iov[0].iov_len = sizeof(stamp);
  	iov[0].iov_base = &stamp;
  	iov[1].iov_len = cc;
  	iov[1].iov_base = buf;
  	if (writev(fileno(fp), &iov[0], 2) == -1)
  		err(1, "writev");
  }
  
  static void
  consume(FILE *fp, off_t len, char *buf, int reg)
  {
  	size_t l;
  
  	if (reg) {
  		if (fseeko(fp, len, SEEK_CUR) == -1)
  			err(1, NULL);
  	}
  	else {
  		while (len > 0) {
  			l = MIN(DEF_BUF, len);
  			if (fread(buf, sizeof(char), l, fp) != l)
  				err(1, "cannot read buffer");
  			len -= l;
  		}
  	}
  }
  
  #define swapstamp(stamp) do { \
  	if (stamp.scr_direction > 0xff) { \
  		stamp.scr_len = bswap64(stamp.scr_len); \
  		stamp.scr_sec = bswap64(stamp.scr_sec); \
  		stamp.scr_usec = bswap32(stamp.scr_usec); \
  		stamp.scr_direction = bswap32(stamp.scr_direction); \
  	} \
  } while (0/*CONSTCOND*/)
  
  static void
  playback(FILE *fp)
  {
  	struct timespec tsi, tso;
  	struct stamp stamp;
  	struct stat pst;
  	char buf[DEF_BUF];
  	off_t nread, save_len;
  	size_t l;
  	time_t tclock;
  	int reg;
  
  	if (fstat(fileno(fp), &pst) == -1)
  		err(1, "fstat failed");
  
  	reg = S_ISREG(pst.st_mode);
  
  	for (nread = 0; !reg || nread < pst.st_size; nread += save_len) {
  		if (fread(&stamp, sizeof(stamp), 1, fp) != 1) {
  			if (reg)
  				err(1, "reading playback header");
  			else
  				break;
  		}
  		swapstamp(stamp);
  		save_len = sizeof(stamp);
  
  		if (reg && stamp.scr_len >
  		    (uint64_t)(pst.st_size - save_len) - nread)
  			errx(1, "invalid stamp");
  
  		save_len += stamp.scr_len;
  		tclock = stamp.scr_sec;
  		tso.tv_sec = stamp.scr_sec;
  		tso.tv_nsec = stamp.scr_usec * 1000;
  
  		switch (stamp.scr_direction) {
  		case 's':
  			if (!qflg)
  			    (void)printf("Script started on %s",
  				ctime(&tclock));
  			tsi = tso;
  			(void)consume(fp, stamp.scr_len, buf, reg);
  			break;
  		case 'e':
  			if (!qflg)
  				(void)printf("\nScript done on %s",
  				    ctime(&tclock));
  			(void)consume(fp, stamp.scr_len, buf, reg);
  			break;
  		case 'i':
  			/* throw input away */
  			(void)consume(fp, stamp.scr_len, buf, reg);
  			break;
  		case 'o':
  			tsi.tv_sec = tso.tv_sec - tsi.tv_sec;
  			tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec;
  			if (tsi.tv_nsec < 0) {
  				tsi.tv_sec -= 1;
  				tsi.tv_nsec += 1000000000;
  			}
  			if (usesleep)
  				(void)nanosleep(&tsi, NULL);
  			tsi = tso;
  			while (stamp.scr_len > 0) {
  				l = MIN(DEF_BUF, stamp.scr_len);
  				if (fread(buf, sizeof(char), l, fp) != l)
  					err(1, "cannot read buffer");
  
  				(void)write(STDOUT_FILENO, buf, l);
  				stamp.scr_len -= l;
  			}
  			break;
  		default:
  			errx(1, "invalid direction");
  		}
  	}
  	(void)fclose(fp);
  	exit(0);
  }
  