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  */
  33
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <sys/stat.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/time.h>
  39
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <libutil.h>
  44 #include <paths.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <termios.h>
  50 #include <unistd.h>
  51
  52 static FILE     *fscript;
  53 static int      master, slave;
  54 static const char *fname;
  55 static int      qflg, ttyflg;
  56
  57 struct  termios tt;
  58
  59 static void     done(int) __dead2;
  60 static void     doshell(char **);
  61 static int      reap(pid_t);
  62 static void     usage(void);
  63
  64 int
  65 main(int argc, char **argv)
  66 {
  67         int cc;
  68         struct termios rtt, stt;
  69         struct winsize win;
  70         int aflg, kflg, ch, n;
  71         struct timeval tv, *tvp;
  72         time_t tvec, start;
  73         char obuf[BUFSIZ];
  74         char ibuf[BUFSIZ];
  75         fd_set rfd;
  76         int flushtime = 30;
  77         pid_t child;
  78
  79         aflg = kflg = 0;
  80         while ((ch = getopt(argc, argv, "aqkt:")) != -1) {
  81                 switch(ch) {
  82                 case 'a':
  83                         aflg = 1;
  84                         break;
  85                 case 'q':
  86                         qflg = 1;
  87                         break;
  88                 case 'k':
  89                         kflg = 1;
  90                         break;
  91                 case 't':
  92                         flushtime = atoi(optarg);
  93                         if (flushtime < 0)
  94                                 errx(1, "invalid flush time %d", flushtime);
  95                         break;
  96                 case '?':
  97                 default:
  98                         usage();
  99                 }
 100         }
 101         argc -= optind;
 102         argv += optind;
 103
 104         if (argc > 0) {
 105                 fname = argv[0];
 106                 argv++;
 107                 argc--;
 108         } else
 109                 fname = "typescript";
 110
 111         if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 112                 err(1, "%s", fname);
 113
 114         if ((ttyflg = isatty(STDIN_FILENO)) != 0) {
 115                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 116                         err(1, "tcgetattr");
 117                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 118                         err(1, "ioctl");
 119                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 120                         err(1, "openpty");
 121         } else {
 122                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 123                         err(1, "openpty");
 124         }
 125
 126         if (!qflg) {
 127                 tvec = time(NULL);
 128                 printf("Script started, output file is %s\n", fname);
 129                 fprintf(fscript, "Script started on %s", ctime(&tvec));
 130                 fflush(fscript);
 131         }
 132
 133         if (ttyflg) {
 134                 rtt = tt;
 135                 cfmakeraw(&rtt);
 136                 rtt.c_lflag &= ~ECHO;
 137                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 138         }
 139
 140         child = fork();
 141         if (child < 0) {
 142                 warn("fork");
 143                 done(1);
 144         }
 145         if (child == 0)
 146                 doshell(argv);
 147         close(slave);
 148
 149         if (flushtime > 0)
 150                 tvp = &tv;
 151         else
 152                 tvp = NULL;
 153
 154         start = time(0);
 155         FD_ZERO(&rfd);
 156         for (;;) {
 157                 FD_SET(master, &rfd);
 158                 FD_SET(STDIN_FILENO, &rfd);
 159                 if (flushtime > 0) {
 160                         tv.tv_sec = flushtime;
 161                         tv.tv_usec = 0;
 162                 }
 163                 n = select(master + 1, &rfd, 0, 0, tvp);
 164                 if (n < 0 && errno != EINTR)
 165                         break;
 166                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 167                         cc = read(STDIN_FILENO, ibuf, sizeof(ibuf));
 168                         if (cc < 0)
 169                                 break;
 170                         if (cc == 0)
 171                                 write(master, ibuf, 0);
 172                         if (cc > 0) {
 173                                 write(master, ibuf, cc);
 174                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 175                                     ((stt.c_lflag & ECHO) == 0)) {
 176                                         fwrite(ibuf, 1, cc, fscript);
 177                                 }
 178                         }
 179                 }
 180                 if (n > 0 && FD_ISSET(master, &rfd)) {
 181                         cc = read(master, obuf, sizeof(obuf));
 182                         if (cc <= 0)
 183                                 break;
 184                         write(STDOUT_FILENO, obuf, cc);
 185                         fwrite(obuf, 1, cc, fscript);
 186                 }
 187                 tvec = time(0);
 188                 if (tvec - start >= flushtime) {
 189                         fflush(fscript);
 190                         start = tvec;
 191                 }
 192         }
 193         done(reap(child));
 194 }
 195
 196 static void
 197 usage(void)
 198 {
 199         fprintf(stderr,
 200             "usage: script [-a] [-q] [-k] [-t time] [file] [command]\n");
 201         exit(1);
 202 }
 203
 204 static int
 205 reap(pid_t child)
 206 {
 207         int e;
 208         pid_t pid;
 209         int status;
 210
 211         e = 0;
 212         while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
 213                 if (pid == child) {
 214                         if (WIFEXITED(status))
 215                                 e = WEXITSTATUS(status);
 216                         else if (WIFSIGNALED(status))
 217                                 e = WTERMSIG(status);
 218                         else /* can't happen */
 219                                 e = 1;
 220                 }
 221         }
 222
 223         return(e);
 224 }
 225
 226 static void
 227 doshell(char **av)
 228 {
 229         const char *shell;
 230
 231         shell = getenv("SHELL");
 232         if (shell == NULL)
 233                 shell = _PATH_BSHELL;
 234
 235         close(master);
 236         fclose(fscript);
 237         login_tty(slave);
 238         if (av[0] != NULL) {
 239                 execvp(av[0], av);
 240                 warn("%s", av[0]);
 241         } else {
 242                 execl(shell, shell, "-i", NULL);
 243                 warn("%s", shell);
 244         }
 245         kill(0, SIGTERM);
 246         done(1);
 247 }
 248
 249 static void
 250 done(int eno)
 251 {
 252         time_t tvec;
 253
 254         if (ttyflg)
 255                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 256         tvec = time(NULL);
 257         if (!qflg) {
 258                 fprintf(fscript,"\nScript done on %s", ctime(&tvec));
 259                 printf("\nScript done, output file is '%s'\n", fname);
 260         }
 261         fclose(fscript);
 262         close(master);
 263         exit(eno);
 264 }