/* $OpenBSD: script.c,v 1.24 2005/12/12 20:10:53 deraadt Exp $ */ /* $NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $ */ /* * Copyright (c) 2001 Theo de Raadt * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* * 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. * 3. 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. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1980, 1992, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static const char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; #endif static const char rcsid[] = "$OpenBSD: script.c,v 1.24 2005/12/12 20:10:53 deraadt Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include FILE *fscript; int master, slave; volatile sig_atomic_t child; pid_t subchild; char *fname; volatile sig_atomic_t dead; volatile sig_atomic_t sigdeadstatus; volatile sig_atomic_t flush; struct termios tt; __dead void done(int); void dooutput(void); void doshell(void); void fail(void); void finish(int); void scriptflush(int); void handlesigwinch(int); int main(int argc, char *argv[]) { extern char *__progname; struct sigaction sa; struct termios rtt; struct winsize win; char ibuf[BUFSIZ]; ssize_t cc, off; int aflg, ch; aflg = 0; while ((ch = getopt(argc, argv, "a")) != -1) switch(ch) { case 'a': aflg = 1; break; default: fprintf(stderr, "usage: %s [-a] [file]\n", __progname); exit(1); } argc -= optind; argv += optind; if (argc > 0) fname = argv[0]; else fname = "typescript"; if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) err(1, "%s", fname); (void)tcgetattr(STDIN_FILENO, &tt); (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); if (openpty(&master, &slave, NULL, &tt, &win) == -1) err(1, "openpty"); (void)printf("Script started, output file is %s\n", fname); rtt = tt; cfmakeraw(&rtt); rtt.c_lflag &= ~ECHO; (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); bzero(&sa, sizeof sa); sigemptyset(&sa.sa_mask); sa.sa_handler = finish; (void)sigaction(SIGCHLD, &sa, NULL); sa.sa_handler = handlesigwinch; sa.sa_flags = SA_RESTART; (void)sigaction(SIGWINCH, &sa, NULL); child = fork(); if (child < 0) { warn("fork"); fail(); } if (child == 0) { subchild = child = fork(); if (child < 0) { warn("fork"); fail(); } if (child) dooutput(); else doshell(); } (void)fclose(fscript); while (1) { if (dead) break; cc = read(STDIN_FILENO, ibuf, BUFSIZ); if (cc == -1 && errno == EINTR) continue; if (cc <= 0) break; for (off = 0; off < cc; ) { ssize_t n = write(master, ibuf + off, cc - off); if (n == -1 && errno != EAGAIN) break; if (n == 0) break; /* skip writing */ if (n > 0) off += n; } } done(sigdeadstatus); } /* ARGSUSED */ void finish(int signo) { int save_errno = errno; int status, e = 1; pid_t pid; while ((pid = wait3(&status, WNOHANG, 0)) > 0) { if (pid == (pid_t)child) { if (WIFEXITED(status)) e = WEXITSTATUS(status); } } dead = 1; sigdeadstatus = e; errno = save_errno; } /* ARGSUSED */ void handlesigwinch(int signo) { int save_errno = errno; struct winsize win; pid_t pgrp; if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { ioctl(slave, TIOCSWINSZ, &win); if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) killpg(pgrp, SIGWINCH); } errno = save_errno; } void dooutput(void) { struct sigaction sa; struct itimerval value; sigset_t blkalrm; char obuf[BUFSIZ]; time_t tvec; ssize_t outcc = 0, cc, off; (void)close(STDIN_FILENO); tvec = time(NULL); (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); sigemptyset(&blkalrm); sigaddset(&blkalrm, SIGALRM); bzero(&sa, sizeof sa); sigemptyset(&sa.sa_mask); sa.sa_handler = scriptflush; (void)sigaction(SIGALRM, &sa, NULL); value.it_interval.tv_sec = SECSPERMIN / 2; value.it_interval.tv_usec = 0; value.it_value = value.it_interval; (void)setitimer(ITIMER_REAL, &value, NULL); for (;;) { if (flush) { if (outcc) { (void)fflush(fscript); outcc = 0; } flush = 0; } cc = read(master, obuf, sizeof (obuf)); if (cc == -1 && errno == EINTR) continue; if (cc <= 0) break; sigprocmask(SIG_BLOCK, &blkalrm, NULL); for (off = 0; off < cc; ) { ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); if (n == -1 && errno != EAGAIN) break; if (n == 0) break; /* skip writing */ if (n > 0) off += n; } (void)fwrite(obuf, 1, cc, fscript); outcc += cc; sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); } done(0); } /* ARGSUSED */ void scriptflush(int signo) { flush = 1; } void doshell(void) { char *shell; shell = getenv("SHELL"); if (shell == NULL) shell = _PATH_BSHELL; (void)close(master); (void)fclose(fscript); login_tty(slave); execl(shell, shell, "-i", (char *)NULL); warn("%s", shell); fail(); } void fail(void) { (void)kill(0, SIGTERM); done(1); } void done(int eval) { time_t tvec; if (subchild) { tvec = time(NULL); (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); (void)fclose(fscript); (void)close(master); } else { (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); (void)printf("Script done, output file is %s\n", fname); } exit(eval); }