script/script.c

   1 /*      $NetBSD: script.c,v 1.6 1998/04/02 11:08:34 kleink Exp $        */
   2
   3 /*
   4  * Copyright (c) 1980, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)script.c    8.1 (Berkeley) 6/6/93";
  45 #endif
  46 __RCSID("$NetBSD: script.c,v 1.6 1998/04/02 11:08:34 kleink Exp $");
  47 #endif /* not lint */
  48
  49 #include <sys/types.h>
  50 #include <sys/wait.h>
  51 #include <sys/stat.h>
  52 #include <sys/ioctl.h>
  53 #include <sys/time.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <paths.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <termios.h>
  64 #include <time.h>
  65 #include <tzfile.h>
  66 #include <unistd.h>
  67 #include <util.h>
  68
  69 FILE    *fscript;
  70 int     master, slave;
  71 int     child, subchild;
  72 int     outcc;
  73 char    *fname;
  74
  75 struct  termios tt;
  76
  77 void    done __P((void));
  78 void    dooutput __P((void));
  79 void    doshell __P((void));
  80 void    fail __P((void));
  81 void    finish __P((int));
  82 int     main __P((int, char **));
  83 void    scriptflush __P((int));
  84
  85 int
  86 main(argc, argv)
  87         int argc;
  88         char *argv[];
  89 {
  90         int cc;
  91         struct termios rtt;
  92         struct winsize win;
  93         int aflg, ch;
  94         char ibuf[BUFSIZ];
  95
  96         aflg = 0;
  97         while ((ch = getopt(argc, argv, "a")) != -1)
  98                 switch(ch) {
  99                 case 'a':
 100                         aflg = 1;
 101                         break;
 102                 case '?':
 103                 default:
 104                         (void)fprintf(stderr, "usage: script [-a] [file]\n");
 105                         exit(1);
 106                 }
 107         argc -= optind;
 108         argv += optind;
 109
 110         if (argc > 0)
 111                 fname = argv[0];
 112         else
 113                 fname = "typescript";
 114
 115         if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 116                 err(1, "fopen %s", fname);
 117
 118         (void)tcgetattr(STDIN_FILENO, &tt);
 119         (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
 120         if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 121                 err(1, "openpty");
 122
 123         (void)printf("Script started, output file is %s\n", fname);
 124         rtt = tt;
 125         cfmakeraw(&rtt);
 126         rtt.c_lflag &= ~ECHO;
 127         (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 128
 129         (void)signal(SIGCHLD, finish);
 130         child = fork();
 131         if (child < 0) {
 132                 warn("fork");
 133                 fail();
 134         }
 135         if (child == 0) {
 136                 subchild = child = fork();
 137                 if (child < 0) {
 138                         warn("fork");
 139                         fail();
 140                 }
 141                 if (child)
 142                         dooutput();
 143                 else
 144                         doshell();
 145         }
 146
 147         (void)fclose(fscript);
 148         while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0)
 149                 (void)write(master, ibuf, cc);
 150         done();
 151         /* NOTREACHED */
 152         return (0);
 153 }
 154
 155 void
 156 finish(signo)
 157         int signo;
 158 {
 159         int die, pid;
 160         union wait status;
 161
 162         die = 0;
 163         while ((pid = wait3((int *)&status, WNOHANG, 0)) > 0)
 164                 if (pid == child)
 165                         die = 1;
 166
 167         if (die)
 168                 done();
 169 }
 170
 171 void
 172 dooutput()
 173 {
 174         struct itimerval value;
 175         int cc;
 176         time_t tvec;
 177         char obuf[BUFSIZ];
 178
 179         (void)close(STDIN_FILENO);
 180         tvec = time(NULL);
 181         (void)fprintf(fscript, "Script started on %s", ctime(&tvec));
 182
 183         (void)signal(SIGALRM, scriptflush);
 184         value.it_interval.tv_sec = SECSPERMIN / 2;
 185         value.it_interval.tv_usec = 0;
 186         value.it_value = value.it_interval;
 187         (void)setitimer(ITIMER_REAL, &value, NULL);
 188         for (;;) {
 189                 cc = read(master, obuf, sizeof (obuf));
 190                 if (cc <= 0)
 191                         break;
 192                 (void)write(1, obuf, cc);
 193                 (void)fwrite(obuf, 1, cc, fscript);
 194                 outcc += cc;
 195         }
 196         done();
 197 }
 198
 199 void
 200 scriptflush(signo)
 201         int signo;
 202 {
 203         if (outcc) {
 204                 (void)fflush(fscript);
 205                 outcc = 0;
 206         }
 207 }
 208
 209 void
 210 doshell()
 211 {
 212         char *shell;
 213
 214         shell = getenv("SHELL");
 215         if (shell == NULL)
 216                 shell = _PATH_BSHELL;
 217
 218         (void)close(master);
 219         (void)fclose(fscript);
 220         login_tty(slave);
 221         execl(shell, shell, "-i", NULL);
 222         warn("execl %s", shell);
 223         fail();
 224 }
 225
 226 void
 227 fail()
 228 {
 229
 230         (void)kill(0, SIGTERM);
 231         done();
 232 }
 233
 234 void
 235 done()
 236 {
 237         time_t tvec;
 238
 239         if (subchild) {
 240                 tvec = time(NULL);
 241                 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
 242                 (void)fclose(fscript);
 243                 (void)close(master);
 244         } else {
 245                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 246                 (void)printf("Script done, output file is %s\n", fname);
 247         }
 248         exit(0);
 249 }