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
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD: src/usr.bin/script/script.c,v 1.24 2004/02/15 17:30:13 cperciva Exp $");
  37
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1980, 1992, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)script.c      8.1 (Berkeley) 6/6/93";
  46 #endif
  47
  48 #include <sys/types.h>
  49 #include <sys/wait.h>
  50 #include <sys/stat.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/time.h>
  53
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #ifndef __APPLE__
  58 #include <libutil.h>
  59 #endif /* !__APPLE__ */
  60 #include <paths.h>
  61 #include <signal.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <termios.h>
  66 #include <unistd.h>
  67 #ifdef __APPLE__
  68 #include <util.h>
  69 #endif /* __APPLE__ */
  70
  71 FILE    *fscript;
  72 int     master, slave;
  73 int     child;
  74 const char *fname;
  75 int     qflg, ttyflg;
  76
  77 struct  termios tt;
  78
  79 void    done(int) __dead2;
  80 void    dooutput(void);
  81 void    doshell(char **);
  82 void    fail(void);
  83 void    finish(void);
  84 static void usage(void);
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         int cc;
  90         struct termios rtt, stt;
  91         struct winsize win;
  92         int aflg, kflg, ch, n;
  93         struct timeval tv, *tvp;
  94         time_t tvec, start;
  95         char obuf[BUFSIZ];
  96         char ibuf[BUFSIZ];
  97         fd_set rfd;
  98         int flushtime = 30;
  99
 100         aflg = kflg = 0;
 101         while ((ch = getopt(argc, argv, "aqkt:")) != -1)
 102                 switch(ch) {
 103                 case 'a':
 104                         aflg = 1;
 105                         break;
 106                 case 'q':
 107                         qflg = 1;
 108                         break;
 109                 case 'k':
 110                         kflg = 1;
 111                         break;
 112                 case 't':
 113                         flushtime = atoi(optarg);
 114                         if (flushtime < 0)
 115                                 err(1, "invalid flush time %d", flushtime);
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage();
 120                 }
 121         argc -= optind;
 122         argv += optind;
 123
 124         if (argc > 0) {
 125                 fname = argv[0];
 126                 argv++;
 127                 argc--;
 128         } else
 129                 fname = "typescript";
 130
 131         if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 132                 err(1, "%s", fname);
 133
 134         if (ttyflg = isatty(STDIN_FILENO)) {
 135                 if (tcgetattr(STDIN_FILENO, &tt) == -1)
 136                         err(1, "tcgetattr");
 137                 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
 138                         err(1, "ioctl");
 139                 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 140                         err(1, "openpty");
 141         } else {
 142                 if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
 143                         err(1, "openpty");
 144         }
 145
 146         if (!qflg) {
 147                 tvec = time(NULL);
 148                 (void)printf("Script started, output file is %s\n", fname);
 149                 (void)fprintf(fscript, "Script started on %s", ctime(&tvec));
 150                 fflush(fscript);
 151         }
 152         if (ttyflg) {
 153                 rtt = tt;
 154                 cfmakeraw(&rtt);
 155                 rtt.c_lflag &= ~ECHO;
 156                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 157         }
 158
 159         child = fork();
 160         if (child < 0) {
 161                 warn("fork");
 162                 done(1);
 163         }
 164         if (child == 0)
 165                 doshell(argv);
 166 #ifdef __APPLE__
 167         (void)close(slave);
 168 #endif /* __APPLE__ */
 169
 170         if (flushtime > 0)
 171                 tvp = &tv;
 172         else
 173                 tvp = NULL;
 174
 175         start = time(0);
 176         FD_ZERO(&rfd);
 177         for (;;) {
 178                 FD_SET(master, &rfd);
 179                 FD_SET(STDIN_FILENO, &rfd);
 180                 if (flushtime > 0) {
 181                         tv.tv_sec = flushtime;
 182                         tv.tv_usec = 0;
 183                 }
 184                 n = select(master + 1, &rfd, 0, 0, tvp);
 185                 if (n < 0 && errno != EINTR)
 186                         break;
 187                 if (n > 0 && FD_ISSET(STDIN_FILENO, &rfd)) {
 188                         cc = read(STDIN_FILENO, ibuf, BUFSIZ);
 189                         if (cc < 0)
 190                                 break;
 191                         if (cc == 0)
 192                                 (void)write(master, ibuf, 0);
 193                         if (cc > 0) {
 194                                 (void)write(master, ibuf, cc);
 195                                 if (kflg && tcgetattr(master, &stt) >= 0 &&
 196                                     ((stt.c_lflag & ECHO) == 0)) {
 197                                         (void)fwrite(ibuf, 1, cc, fscript);
 198                                 }
 199                         }
 200                 }
 201                 if (n > 0 && FD_ISSET(master, &rfd)) {
 202                         cc = read(master, obuf, sizeof (obuf));
 203                         if (cc <= 0)
 204                                 break;
 205                         (void)write(STDOUT_FILENO, obuf, cc);
 206                         (void)fwrite(obuf, 1, cc, fscript);
 207                 }
 208                 tvec = time(0);
 209                 if (tvec - start >= flushtime) {
 210                         fflush(fscript);
 211                         start = tvec;
 212                 }
 213         }
 214         finish();
 215         done(0);
 216 }
 217
 218 static void
 219 usage(void)
 220 {
 221         (void)fprintf(stderr,
 222             "usage: script [-akq] [-t time] [file [command ...]]\n");
 223         exit(1);
 224 }
 225
 226 void
 227 finish(void)
 228 {
 229         pid_t pid;
 230         int die, e, status;
 231
 232         die = e = 0;
 233         while ((pid = wait3(&status, WNOHANG, 0)) > 0)
 234                 if (pid == child) {
 235                         die = 1;
 236                         if (WIFEXITED(status))
 237                                 e = WEXITSTATUS(status);
 238                         else if (WIFSIGNALED(status))
 239                                 e = WTERMSIG(status);
 240                         else /* can't happen */
 241                                 e = 1;
 242                 }
 243
 244         if (die)
 245                 done(e);
 246 }
 247
 248 void
 249 doshell(char **av)
 250 {
 251         const char *shell;
 252
 253         shell = getenv("SHELL");
 254         if (shell == NULL)
 255                 shell = _PATH_BSHELL;
 256
 257         (void)close(master);
 258         (void)fclose(fscript);
 259         login_tty(slave);
 260         if (av[0]) {
 261                 execvp(av[0], av);
 262                 warn("%s", av[0]);
 263         } else {
 264                 execl(shell, shell, "-i", (char *)NULL);
 265                 warn("%s", shell);
 266         }
 267         fail();
 268 }
 269
 270 void
 271 fail(void)
 272 {
 273         (void)kill(0, SIGTERM);
 274         done(1);
 275 }
 276
 277 void
 278 done(int eno)
 279 {
 280         time_t tvec;
 281
 282         if (ttyflg)
 283                 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 284         tvec = time(NULL);
 285         if (!qflg) {
 286                 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
 287                 (void)printf("\nScript done, output file is %s\n", fname);
 288         }
 289         (void)fclose(fscript);
 290         (void)close(master);
 291         exit(eno);
 292 }