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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1992, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)script.c 8.1 (Berkeley) 6/6/93
  35  * $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 $
  36  * $DragonFly: src/usr.bin/script/script.c,v 1.10 2005/03/16 06:26:49 cpressey Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/wait.h>
  41 #include <sys/stat.h>
  42 #include <sys/ioctl.h>
  43 #include <sys/time.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <libutil.h>
  49 #include <paths.h>
  50 #include <signal.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <termios.h>
  55 #include <unistd.h>
  56
  57 static FILE     *fscript;
  58 static int      master, slave;
  59 static const char *fname;
  60 static int      qflg, ttyflg;
  61
  62 struct  termios tt;
  63
  64 static void     done(int) __dead2;
  65 static void     doshell(char **);
  66 static int      reap(pid_t);
  67 static void     usage(void);
  68
  69 int
  70 main(int argc, char **argv)
  71 {
  72         int cc;
  73         struct termios rtt, stt;
  74         struct winsize win;
  75         int aflg, kflg, ch, n;
  76         struct timeval tv, *tvp;
  77         time_t tvec, start;
  78         char obuf[BUFSIZ];
  79         char ibuf[BUFSIZ];
  80         fd_set rfd;
  81         int flushtime = 30;
  82         pid_t child;
  83
  84         aflg = kflg = 0;
  85         while ((ch = getopt(argc, argv, "aqkt:")) != -1) {
  86                 switch(ch) {
  87                 case 'a':
  88                         aflg = 1;
  89                         break;
  90                 case 'q':
  91                         qflg = 1;
  92                         break;
  93                 case 'k':
  94                         kflg = 1;
  95                         break;
  96                 case 't':
  97                         flushtime = atoi(optarg);
  98                         if (flushtime < 0)
  99                                 errx(1, "invalid flush time %d", flushtime);
 100                         break;
 101                 case '?':
 102                 default:
 103                         usage();
 104                 }
 105         }
 106         argc -= optind;
 107         argv += optind;
 108
 109         if (argc > 0) {
 110                 fname = argv[0];
 111                 argv++;
 112                 argc--;
 113         } else
 114                 fname = "typescript";
 115
 116         if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 117                 err(1, "%s", fname);
 118
 119         if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
 120                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 121                         err(1, "tcgetattr");
 122                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 123                         err(1, "ioctl");
 124                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 125                         err(1, "openpty");
 126         } else {
 127                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 128                         err(1, "openpty");
 129         }
 130
 131         if (!qflg) {
 132                 tvec = time(NULL);
 133                 printf("Script started, output file is %s\n", fname);
 134                 fprintf(fscript, "Script started on %s", ctime(&tvec));
 135                 fflush(fscript);
 136         }
 137
 138         if (ttyflg) {
 139                 rtt = tt;
 140                 cfmakeraw(&rtt);
 141                 rtt.c_lflag &= ~ECHO;
 142                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 143         }
 144
 145         child = fork();
 146         if (child < 0) {
 147                 warn("fork");
 148                 done(1);
 149         }
 150         if (child == 0)
 151                 doshell(argv);
 152         close(slave);
 153
 154         if (flushtime > 0)
 155                 tvp = &tv;
 156         else
 157                 tvp = NULL;
 158
 159         start = time(0);
 160         FD_ZERO(&rfd);
 161         for (;;) {
 162                 FD_SET(master, &rfd);
 163                 FD_SET(STDIN_FILENO, &rfd);
 164                 if (flushtime > 0) {
 165                         tv.tv_sec = flushtime;
 166                         tv.tv_usec = 0;
 167                 }
 168                 n = select(master + 1, &rfd, 0, 0, tvp);
 169                 if (n < 0 && errno != EINTR)
 170                         break;
 171                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 172                         cc = read(STDIN_FILENO, ibuf, sizeof(ibuf));
 173                         if (cc < 0)
 174                                 break;
 175                         if (cc == 0)
 176                                 write(master, ibuf, 0);
 177                         if (cc > 0) {
 178                                 write(master, ibuf, cc);
 179                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 180                                     ((stt.c_lflag & ECHO) == 0)) {
 181                                         fwrite(ibuf, 1, cc, fscript);
 182                                 }
 183                         }
 184                 }
 185                 if (n > 0 && FD_ISSET(master, &rfd)) {
 186                         cc = read(master, obuf, sizeof(obuf));
 187                         if (cc <= 0)
 188                                 break;
 189                         write(STDOUT_FILENO, obuf, cc);
 190                         fwrite(obuf, 1, cc, fscript);
 191                 }
 192                 tvec = time(0);
 193                 if (tvec - start >= flushtime) {
 194                         fflush(fscript);
 195                         start = tvec;
 196                 }
 197         }
 198         done(reap(child));
 199 }
 200
 201 static void
 202 usage(void)
 203 {
 204         fprintf(stderr,
 205             "usage: script [-a] [-q] [-k] [-t time] [file] [command]\n");
 206         exit(1);
 207 }
 208
 209 static int
 210 reap(pid_t child)
 211 {
 212         int e;
 213         pid_t pid;
 214         union wait status;
 215
 216         e = 0;
 217         while ((pid = wait3((int *)&status, WNOHANG, NULL)) > 0) {
 218                 if (pid == child) {
 219                         if (WIFEXITED(status))
 220                                 e = WEXITSTATUS(status);
 221                         else if (WIFSIGNALED(status))
 222                                 e = WTERMSIG(status);
 223                         else /* can't happen */
 224                                 e = 1;
 225                 }
 226         }
 227
 228         return(e);
 229 }
 230
 231 static void
 232 doshell(char **av)
 233 {
 234         const char *shell;
 235
 236         shell = getenv("SHELL");
 237         if (shell == NULL)
 238                 shell = _PATH_BSHELL;
 239
 240         close(master);
 241         fclose(fscript);
 242         login_tty(slave);
 243         if (av[0] != NULL) {
 244                 execvp(av[0], av);
 245                 warn("%s", av[0]);
 246         } else {
 247                 execl(shell, shell, "-i", NULL);
 248                 warn("%s", shell);
 249         }
 250         kill(0, SIGTERM);
 251         done(1);
 252 }
 253
 254 static void
 255 done(int eno)
 256 {
 257         time_t tvec;
 258
 259         if (ttyflg)
 260                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 261         tvec = time(NULL);
 262         if (!qflg) {
 263                 fprintf(fscript,"\nScript done on %s", ctime(&tvec));
 264                 printf("\nScript done, output file is '%s'\n", fname);
 265         }
 266         fclose(fscript);
 267         close(master);
 268         exit(eno);
 269 }