1 /* $OpenBSD: script.c,v 1.15 2001/07/09 07:04:52 deraadt Exp $ */ 2 /* $NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1980, 1992, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; 46 #endif 47 static char rcsid[] = "$OpenBSD: script.c,v 1.15 2001/07/09 07:04:52 deraadt Exp $"; 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <sys/wait.h> 52 #include <sys/stat.h> 53 #include <sys/ioctl.h> 54 #include <sys/time.h> 55 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 <tzfile.h> 65 #include <unistd.h> 66 67 #include <util.h> 68 #include <err.h> 69 70 FILE *fscript; 71 int master, slave; 72 int child, subchild; 73 int outcc; 74 char *fname; 75 76 struct termios tt; 77 78 __dead void done __P((int)); 79 void dooutput __P((void)); 80 void doshell __P((void)); 81 void fail __P((void)); 82 void finish __P((int)); 83 void scriptflush __P((int)); 84 void handlesigwinch __P((int)); 85 86 87 int 88 main(argc, argv) 89 int argc; 90 char *argv[]; 91 { 92 register int cc; 93 struct termios rtt; 94 struct winsize win; 95 int aflg, ch; 96 char ibuf[BUFSIZ]; 97 98 aflg = 0; 99 while ((ch = getopt(argc, argv, "a")) != -1) 100 switch(ch) { 101 case 'a': 102 aflg = 1; 103 break; 104 case '?': 105 default: 106 (void)fprintf(stderr, "usage: script [-a] [file]\n"); 107 exit(1); 108 } 109 argc -= optind; 110 argv += optind; 111 112 if (argc > 0) 113 fname = argv[0]; 114 else 115 fname = "typescript"; 116 117 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 118 err(1, "%s", fname); 119 120 (void)tcgetattr(STDIN_FILENO, &tt); 121 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 122 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 123 err(1, "openpty"); 124 125 (void)printf("Script started, output file is %s\n", fname); 126 rtt = tt; 127 cfmakeraw(&rtt); 128 rtt.c_lflag &= ~ECHO; 129 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 130 131 (void)signal(SIGWINCH, handlesigwinch); 132 (void)signal(SIGCHLD, finish); 133 child = fork(); 134 if (child < 0) { 135 perror("fork"); 136 fail(); 137 } 138 if (child == 0) { 139 subchild = child = fork(); 140 if (child < 0) { 141 perror("fork"); 142 fail(); 143 } 144 if (child) 145 dooutput(); 146 else 147 doshell(); 148 } 149 150 (void)fclose(fscript); 151 while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) 152 (void)write(master, ibuf, cc); 153 done(0); 154 } 155 156 void 157 finish(signo) 158 int signo; 159 { 160 register int die, pid; 161 int save_errno = errno; 162 int status, e; 163 164 die = e = 0; 165 while ((pid = wait3(&status, WNOHANG, 0)) > 0) 166 if (pid == child) { 167 die = 1; 168 if (WIFEXITED(status)) 169 e = WEXITSTATUS(status); 170 else 171 e = 1; 172 } 173 174 if (die) 175 done(e); 176 errno = save_errno; 177 } 178 179 void 180 handlesigwinch(signo) 181 int signo; 182 { 183 struct winsize win; 184 pid_t pgrp; 185 int save_errno = errno; 186 187 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 188 ioctl(slave, TIOCSWINSZ, &win); 189 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 190 killpg(pgrp, SIGWINCH); 191 } 192 errno = save_errno; 193 } 194 195 void 196 dooutput() 197 { 198 struct itimerval value; 199 register int cc; 200 time_t tvec; 201 char obuf[BUFSIZ]; 202 203 (void)close(STDIN_FILENO); 204 tvec = time(NULL); 205 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 206 207 (void)signal(SIGALRM, scriptflush); 208 value.it_interval.tv_sec = SECSPERMIN / 2; 209 value.it_interval.tv_usec = 0; 210 value.it_value = value.it_interval; 211 (void)setitimer(ITIMER_REAL, &value, NULL); 212 for (;;) { 213 cc = read(master, obuf, sizeof (obuf)); 214 if (cc <= 0) 215 break; 216 (void)write(1, obuf, cc); 217 (void)fwrite(obuf, 1, cc, fscript); 218 outcc += cc; 219 } 220 done(0); 221 } 222 223 /* XXX totally illegal race */ 224 void 225 scriptflush(signo) 226 int signo; 227 { 228 int save_errno = errno; 229 230 if (outcc) { 231 (void)fflush(fscript); 232 outcc = 0; 233 } 234 errno = save_errno; 235 } 236 237 void 238 doshell() 239 { 240 char *shell; 241 242 shell = getenv("SHELL"); 243 if (shell == NULL) 244 shell = _PATH_BSHELL; 245 246 (void)close(master); 247 (void)fclose(fscript); 248 login_tty(slave); 249 execl(shell, shell, "-i", (char *)NULL); 250 perror(shell); 251 fail(); 252 } 253 254 void 255 fail() 256 { 257 258 (void)kill(0, SIGTERM); 259 done(1); 260 } 261 262 void 263 done(eval) 264 int eval; 265 { 266 time_t tvec; 267 268 if (subchild) { 269 tvec = time(NULL); 270 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 271 (void)fclose(fscript); 272 (void)close(master); 273 } else { 274 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 275 (void)printf("Script done, output file is %s\n", fname); 276 } 277 exit(eval); 278 } 279 280