usr.bin/script/script.c

   1 /*
   2  * Copyright (c) 1980, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1992, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)script.c 8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/usr.bin/script/script.c,v 1.11.2.2 2004/03/13 09:21:00 cperciva Exp $
  32  * $DragonFly: src/usr.bin/script/script.c,v 1.10 2005/03/16 06:26:49 cpressey Exp $
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/wait.h>
  37 #include <sys/stat.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/time.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <libutil.h>
  45 #include <paths.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <termios.h>
  51 #include <unistd.h>
  52
  53 static FILE     *fscript;
  54 static int      master, slave;
  55 static const char *fname;
  56 static int      qflg, ttyflg;
  57
  58 struct  termios tt;
  59
  60 static void     done(int) __dead2;
  61 static void     doshell(char **);
  62 static int      reap(pid_t);
  63 static void     usage(void);
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         int cc;
  69         struct termios rtt, stt;
  70         struct winsize win;
  71         int aflg, kflg, ch, n;
  72         struct timeval tv, *tvp;
  73         time_t tvec, start;
  74         char obuf[BUFSIZ];
  75         char ibuf[BUFSIZ];
  76         fd_set rfd;
  77         int flushtime = 30;
  78         pid_t child;
  79
  80         aflg = kflg = 0;
  81         while ((ch = getopt(argc, argv, "aqkt:")) != -1) {
  82                 switch(ch) {
  83                 case 'a':
  84                         aflg = 1;
  85                         break;
  86                 case 'q':
  87                         qflg = 1;
  88                         break;
  89                 case 'k':
  90                         kflg = 1;
  91                         break;
  92                 case 't':
  93                         flushtime = atoi(optarg);
  94                         if (flushtime < 0)
  95                                 errx(1, "invalid flush time %d", flushtime);
  96                         break;
  97                 case '?':
  98                 default:
  99                         usage();
 100                 }
 101         }
 102         argc -= optind;
 103         argv += optind;
 104
 105         if (argc > 0) {
 106                 fname = argv[0];
 107                 argv++;
 108                 argc--;
 109         } else
 110                 fname = "typescript";
 111
 112         if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 113                 err(1, "%s", fname);
 114
 115         if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
 116                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 117                         err(1, "tcgetattr");
 118                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 119                         err(1, "ioctl");
 120                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 121                         err(1, "openpty");
 122         } else {
 123                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 124                         err(1, "openpty");
 125         }
 126
 127         if (!qflg) {
 128                 tvec = time(NULL);
 129                 printf("Script started, output file is %s\n", fname);
 130                 fprintf(fscript, "Script started on %s", ctime(&tvec));
 131                 fflush(fscript);
 132         }
 133
 134         if (ttyflg) {
 135                 rtt = tt;
 136                 cfmakeraw(&rtt);
 137                 rtt.c_lflag &= ~ECHO;
 138                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 139         }
 140
 141         child = fork();
 142         if (child < 0) {
 143                 warn("fork");
 144                 done(1);
 145         }
 146         if (child == 0)
 147                 doshell(argv);
 148         close(slave);
 149
 150         if (flushtime > 0)
 151                 tvp = &tv;
 152         else
 153                 tvp = NULL;
 154
 155         start = time(0);
 156         FD_ZERO(&rfd);
 157         for (;;) {
 158                 FD_SET(master, &rfd);
 159                 FD_SET(STDIN_FILENO, &rfd);
 160                 if (flushtime > 0) {
 161                         tv.tv_sec = flushtime;
 162                         tv.tv_usec = 0;
 163                 }
 164                 n = select(master + 1, &rfd, 0, 0, tvp);
 165                 if (n < 0 && errno != EINTR)
 166                         break;
 167                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 168                         cc = read(STDIN_FILENO, ibuf, sizeof(ibuf));
 169                         if (cc < 0)
 170                                 break;
 171                         if (cc == 0)
 172                                 write(master, ibuf, 0);
 173                         if (cc > 0) {
 174                                 write(master, ibuf, cc);
 175                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 176                                     ((stt.c_lflag & ECHO) == 0)) {
 177                                         fwrite(ibuf, 1, cc, fscript);
 178                                 }
 179                         }
 180                 }
 181                 if (n > 0 && FD_ISSET(master, &rfd)) {
 182                         cc = read(master, obuf, sizeof(obuf));
 183                         if (cc <= 0)
 184                                 break;
 185                         write(STDOUT_FILENO, obuf, cc);
 186                         fwrite(obuf, 1, cc, fscript);
 187                 }
 188                 tvec = time(0);
 189                 if (tvec - start >= flushtime) {
 190                         fflush(fscript);
 191                         start = tvec;
 192                 }
 193         }
 194         done(reap(child));
 195 }
 196
 197 static void
 198 usage(void)
 199 {
 200         fprintf(stderr,
 201             "usage: script [-a] [-q] [-k] [-t time] [file] [command]\n");
 202         exit(1);
 203 }
 204
 205 static int
 206 reap(pid_t child)
 207 {
 208         int e;
 209         pid_t pid;
 210         union wait status;
 211
 212         e = 0;
 213         while ((pid = wait3((int *)&status, WNOHANG, NULL)) > 0) {
 214                 if (pid == child) {
 215                         if (WIFEXITED(status))
 216                                 e = WEXITSTATUS(status);
 217                         else if (WIFSIGNALED(status))
 218                                 e = WTERMSIG(status);
 219                         else /* can't happen */
 220                                 e = 1;
 221                 }
 222         }
 223
 224         return(e);
 225 }
 226
 227 static void
 228 doshell(char **av)
 229 {
 230         const char *shell;
 231
 232         shell = getenv("SHELL");
 233         if (shell == NULL)
 234                 shell = _PATH_BSHELL;
 235
 236         close(master);
 237         fclose(fscript);
 238         login_tty(slave);
 239         if (av[0] != NULL) {
 240                 execvp(av[0], av);
 241                 warn("%s", av[0]);
 242         } else {
 243                 execl(shell, shell, "-i", NULL);
 244                 warn("%s", shell);
 245         }
 246         kill(0, SIGTERM);
 247         done(1);
 248 }
 249
 250 static void
 251 done(int eno)
 252 {
 253         time_t tvec;
 254
 255         if (ttyflg)
 256                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 257         tvec = time(NULL);
 258         if (!qflg) {
 259                 fprintf(fscript,"\nScript done on %s", ctime(&tvec));
 260                 printf("\nScript done, output file is '%s'\n", fname);
 261         }
 262         fclose(fscript);
 263         close(master);
 264         exit(eno);
 265 }