4511d3297e
This patch virtually re-writes the playback code and contains improvements (mainly the dependency upon BUFSIZ being the same size as it was wrote at). OK: christos, joerg
384 lines
8.3 KiB
C
384 lines
8.3 KiB
C
/* $NetBSD: script.c,v 1.12 2006/06/14 16:05:38 liamjfoy Exp $ */
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/*
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* Copyright (c) 1980, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: script.c,v 1.12 2006/06/14 16:05:38 liamjfoy Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <util.h>
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#define DEF_BUF 65536
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struct stamp {
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uint64_t scr_len; /* amount of data */
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uint64_t scr_sec; /* time it arrived in seconds... */
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uint32_t scr_usec; /* ...and microseconds */
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uint32_t scr_direction; /* 'i', 'o', etc (also indicates endianness) */
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};
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FILE *fscript;
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int master, slave;
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int child, subchild;
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int outcc;
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int usesleep, rawout;
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char *fname;
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struct termios tt;
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void done(void);
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void dooutput(void);
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void doshell(void);
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void fail(void);
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void finish(int);
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int main(int, char **);
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void scriptflush(int);
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void record(FILE *, char *, size_t, int);
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void playback(FILE *);
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int
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main(int argc, char *argv[])
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{
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int cc;
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struct termios rtt;
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struct winsize win;
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int aflg, pflg, ch;
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char ibuf[BUFSIZ];
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aflg = 0;
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pflg = 0;
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usesleep = 1;
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rawout = 0;
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while ((ch = getopt(argc, argv, "adpr")) != -1)
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switch(ch) {
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case 'a':
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aflg = 1;
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break;
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case 'd':
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usesleep = 0;
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break;
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case 'p':
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pflg = 1;
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break;
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case 'r':
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rawout = 1;
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break;
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case '?':
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default:
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(void)fprintf(stderr, "usage: %s [-adpr] [file]\n",
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getprogname());
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exit(1);
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}
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argc -= optind;
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argv += optind;
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if (argc > 0)
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fname = argv[0];
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else
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fname = "typescript";
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if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL)
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err(1, "fopen %s", fname);
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if (pflg)
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playback(fscript);
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(void)tcgetattr(STDIN_FILENO, &tt);
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(void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
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if (openpty(&master, &slave, NULL, &tt, &win) == -1)
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err(1, "openpty");
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(void)printf("Script started, output file is %s\n", fname);
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rtt = tt;
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cfmakeraw(&rtt);
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rtt.c_lflag &= ~ECHO;
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
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(void)signal(SIGCHLD, finish);
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child = fork();
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if (child < 0) {
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warn("fork");
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fail();
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}
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if (child == 0) {
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subchild = child = fork();
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if (child < 0) {
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warn("fork");
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fail();
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}
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if (child)
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dooutput();
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else
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doshell();
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}
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if (!rawout)
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(void)fclose(fscript);
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while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) {
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if (rawout)
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record(fscript, ibuf, cc, 'i');
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(void)write(master, ibuf, cc);
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}
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done();
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/* NOTREACHED */
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return (0);
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}
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void
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finish(int signo)
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{
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int die, pid, status;
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die = 0;
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while ((pid = wait3(&status, WNOHANG, 0)) > 0)
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if (pid == child)
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die = 1;
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if (die)
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done();
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}
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void
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dooutput()
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{
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struct itimerval value;
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int cc;
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time_t tvec;
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char obuf[BUFSIZ];
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(void)close(STDIN_FILENO);
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tvec = time(NULL);
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if (rawout)
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record(fscript, NULL, 0, 's');
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else
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(void)fprintf(fscript, "Script started on %s", ctime(&tvec));
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(void)signal(SIGALRM, scriptflush);
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value.it_interval.tv_sec = SECSPERMIN / 2;
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value.it_interval.tv_usec = 0;
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value.it_value = value.it_interval;
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(void)setitimer(ITIMER_REAL, &value, NULL);
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for (;;) {
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cc = read(master, obuf, sizeof (obuf));
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if (cc <= 0)
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break;
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(void)write(1, obuf, cc);
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if (rawout)
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record(fscript, obuf, cc, 'o');
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else
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(void)fwrite(obuf, 1, cc, fscript);
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outcc += cc;
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}
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done();
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}
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void
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scriptflush(int signo)
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{
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if (outcc) {
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(void)fflush(fscript);
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outcc = 0;
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}
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}
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void
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doshell()
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{
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char *shell;
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shell = getenv("SHELL");
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if (shell == NULL)
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shell = _PATH_BSHELL;
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(void)close(master);
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(void)fclose(fscript);
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login_tty(slave);
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execl(shell, shell, "-i", NULL);
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warn("execl %s", shell);
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fail();
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}
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void
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fail()
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{
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(void)kill(0, SIGTERM);
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done();
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}
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void
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done()
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{
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time_t tvec;
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if (subchild) {
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tvec = time(NULL);
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if (rawout)
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record(fscript, NULL, 0, 'e');
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else
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(void)fprintf(fscript,"\nScript done on %s",
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ctime(&tvec));
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(void)fclose(fscript);
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(void)close(master);
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} else {
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
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(void)printf("Script done, output file is %s\n", fname);
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}
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exit(0);
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}
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void
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record(FILE *fscript, char *buf, size_t cc, int direction)
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{
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struct iovec iov[2];
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struct stamp stamp;
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struct timeval tv;
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(void)gettimeofday(&tv, NULL);
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stamp.scr_len = cc;
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stamp.scr_sec = tv.tv_sec;
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stamp.scr_usec = tv.tv_usec;
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stamp.scr_direction = direction;
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iov[0].iov_len = sizeof(stamp);
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iov[0].iov_base = &stamp;
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iov[1].iov_len = cc;
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iov[1].iov_base = buf;
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if (writev(fileno(fscript), &iov[0], 2) == -1)
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err(1, "writev");
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}
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#define swapstamp(stamp) do { \
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if (stamp.scr_direction > 0xff) { \
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stamp.scr_len = bswap64(stamp.scr_len); \
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stamp.scr_sec = bswap64(stamp.scr_sec); \
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stamp.scr_usec = bswap32(stamp.scr_usec); \
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stamp.scr_direction = bswap32(stamp.scr_direction); \
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} \
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} while (0/*CONSTCOND*/)
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void
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playback(FILE *fscript)
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{
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struct timespec tsi, tso;
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struct stamp stamp;
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struct stat playback_stat;
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char buf[DEF_BUF];
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off_t nread, save_len;
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size_t l;
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time_t clock;
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if (fstat(fileno(fscript), &playback_stat) == -1)
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err(1, "fstat failed");
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for (nread = 0; nread < playback_stat.st_size; nread += save_len) {
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if (fread(&stamp, sizeof(stamp), 1, fscript) != 1)
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err(1, "reading playback header");
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swapstamp(stamp);
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save_len = sizeof(stamp);
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if (stamp.scr_len >
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(uint64_t)(playback_stat.st_size - save_len) - nread)
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err(1, "invalid stamp");
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save_len += stamp.scr_len;
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clock = stamp.scr_sec;
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tso.tv_sec = stamp.scr_sec;
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tso.tv_nsec = stamp.scr_usec * 1000;
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switch (stamp.scr_direction) {
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case 's':
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(void)printf("Script started on %s", ctime(&clock));
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tsi = tso;
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fseek(fscript, stamp.scr_len, SEEK_CUR);
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break;
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case 'e':
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(void)printf("\nScript done on %s", ctime(&clock));
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fseek(fscript, stamp.scr_len, SEEK_CUR);
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break;
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case 'i':
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/* throw input away */
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fseek(fscript, stamp.scr_len, SEEK_CUR);
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break;
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case 'o':
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tsi.tv_sec = tso.tv_sec - tsi.tv_sec;
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tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec;
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if (tsi.tv_nsec < 0) {
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tsi.tv_sec -= 1;
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tsi.tv_nsec += 1000000000;
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}
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if (usesleep)
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(void)nanosleep(&tsi, NULL);
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tsi = tso;
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while (stamp.scr_len > 0) {
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l = MIN(DEF_BUF, stamp.scr_len);
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if (fread(buf, sizeof(char), l, fscript) != l)
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err(1, "cannot read buffer");
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(void)write(STDOUT_FILENO, buf, l);
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stamp.scr_len -= l;
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}
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break;
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default:
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err(1, "invalid direction");
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}
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}
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(void)fclose(fscript);
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exit(0);
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}
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