1 /* $OpenBSD: script.c,v 1.27 2015/07/19 06:12:06 deraadt Exp $ */ 2 /* $NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 2001 Theo de Raadt 6 * 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1980, 1992, 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 #include <sys/types.h> 59 #include <sys/wait.h> 60 #include <sys/stat.h> 61 #include <sys/ioctl.h> 62 #include <sys/time.h> 63 64 #include <errno.h> 65 #include <fcntl.h> 66 #include <paths.h> 67 #include <signal.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <termios.h> 72 #include <unistd.h> 73 74 #include <util.h> 75 #include <err.h> 76 77 FILE *fscript; 78 int master, slave; 79 volatile sig_atomic_t child; 80 pid_t subchild; 81 char *fname; 82 83 volatile sig_atomic_t dead; 84 volatile sig_atomic_t sigdeadstatus; 85 volatile sig_atomic_t flush; 86 87 struct termios tt; 88 89 __dead void done(int); 90 void dooutput(void); 91 void doshell(void); 92 void fail(void); 93 void finish(int); 94 void scriptflush(int); 95 void handlesigwinch(int); 96 97 int 98 main(int argc, char *argv[]) 99 { 100 extern char *__progname; 101 struct sigaction sa; 102 struct termios rtt; 103 struct winsize win; 104 char ibuf[BUFSIZ]; 105 ssize_t cc, off; 106 int aflg, ch; 107 108 aflg = 0; 109 while ((ch = getopt(argc, argv, "a")) != -1) 110 switch(ch) { 111 case 'a': 112 aflg = 1; 113 break; 114 default: 115 fprintf(stderr, "usage: %s [-a] [file]\n", __progname); 116 exit(1); 117 } 118 argc -= optind; 119 argv += optind; 120 121 if (argc > 0) 122 fname = argv[0]; 123 else 124 fname = "typescript"; 125 126 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 127 err(1, "%s", fname); 128 129 (void)tcgetattr(STDIN_FILENO, &tt); 130 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 131 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 132 err(1, "openpty"); 133 134 (void)printf("Script started, output file is %s\n", fname); 135 rtt = tt; 136 cfmakeraw(&rtt); 137 rtt.c_lflag &= ~ECHO; 138 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 139 140 bzero(&sa, sizeof sa); 141 sigemptyset(&sa.sa_mask); 142 sa.sa_handler = handlesigwinch; 143 sa.sa_flags = SA_RESTART; 144 (void)sigaction(SIGWINCH, &sa, NULL); 145 146 child = fork(); 147 if (child < 0) { 148 warn("fork"); 149 fail(); 150 } 151 if (child == 0) { 152 subchild = child = fork(); 153 if (child < 0) { 154 warn("fork"); 155 fail(); 156 } 157 if (child) 158 dooutput(); 159 else 160 doshell(); 161 } 162 163 bzero(&sa, sizeof sa); 164 sigemptyset(&sa.sa_mask); 165 sa.sa_handler = finish; 166 (void)sigaction(SIGCHLD, &sa, NULL); 167 168 (void)fclose(fscript); 169 while (1) { 170 if (dead) 171 break; 172 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 173 if (cc == -1 && errno == EINTR) 174 continue; 175 if (cc <= 0) 176 break; 177 for (off = 0; off < cc; ) { 178 ssize_t n = write(master, ibuf + off, cc - off); 179 if (n == -1 && errno != EAGAIN) 180 break; 181 if (n == 0) 182 break; /* skip writing */ 183 if (n > 0) 184 off += n; 185 } 186 } 187 done(sigdeadstatus); 188 } 189 190 /* ARGSUSED */ 191 void 192 finish(int signo) 193 { 194 int save_errno = errno; 195 int status, e = 1; 196 pid_t pid; 197 198 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 199 if (pid == (pid_t)child) { 200 if (WIFEXITED(status)) 201 e = WEXITSTATUS(status); 202 } 203 } 204 dead = 1; 205 sigdeadstatus = e; 206 errno = save_errno; 207 } 208 209 /* ARGSUSED */ 210 void 211 handlesigwinch(int signo) 212 { 213 int save_errno = errno; 214 struct winsize win; 215 pid_t pgrp; 216 217 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 218 ioctl(slave, TIOCSWINSZ, &win); 219 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 220 killpg(pgrp, SIGWINCH); 221 } 222 errno = save_errno; 223 } 224 225 void 226 dooutput(void) 227 { 228 struct sigaction sa; 229 struct itimerval value; 230 sigset_t blkalrm; 231 char obuf[BUFSIZ]; 232 time_t tvec; 233 ssize_t outcc = 0, cc, off; 234 235 (void)close(STDIN_FILENO); 236 tvec = time(NULL); 237 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 238 239 sigemptyset(&blkalrm); 240 sigaddset(&blkalrm, SIGALRM); 241 bzero(&sa, sizeof sa); 242 sigemptyset(&sa.sa_mask); 243 sa.sa_handler = scriptflush; 244 (void)sigaction(SIGALRM, &sa, NULL); 245 246 bzero(&sa, sizeof sa); 247 sigemptyset(&sa.sa_mask); 248 sa.sa_handler = SIG_IGN; 249 (void)sigaction(SIGCHLD, &sa, NULL); 250 251 value.it_interval.tv_sec = 30; 252 value.it_interval.tv_usec = 0; 253 value.it_value = value.it_interval; 254 (void)setitimer(ITIMER_REAL, &value, NULL); 255 for (;;) { 256 if (flush) { 257 if (outcc) { 258 (void)fflush(fscript); 259 outcc = 0; 260 } 261 flush = 0; 262 } 263 cc = read(master, obuf, sizeof (obuf)); 264 if (cc == -1 && errno == EINTR) 265 continue; 266 if (cc <= 0) 267 break; 268 sigprocmask(SIG_BLOCK, &blkalrm, NULL); 269 for (off = 0; off < cc; ) { 270 ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); 271 if (n == -1 && errno != EAGAIN) 272 break; 273 if (n == 0) 274 break; /* skip writing */ 275 if (n > 0) 276 off += n; 277 } 278 (void)fwrite(obuf, 1, cc, fscript); 279 outcc += cc; 280 sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); 281 } 282 done(0); 283 } 284 285 /* ARGSUSED */ 286 void 287 scriptflush(int signo) 288 { 289 flush = 1; 290 } 291 292 void 293 doshell(void) 294 { 295 char *shell; 296 297 shell = getenv("SHELL"); 298 if (shell == NULL) 299 shell = _PATH_BSHELL; 300 301 (void)close(master); 302 (void)fclose(fscript); 303 login_tty(slave); 304 execl(shell, shell, "-i", (char *)NULL); 305 warn("%s", shell); 306 fail(); 307 } 308 309 void 310 fail(void) 311 { 312 313 (void)kill(0, SIGTERM); 314 done(1); 315 } 316 317 void 318 done(int eval) 319 { 320 time_t tvec; 321 322 if (subchild) { 323 tvec = time(NULL); 324 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 325 (void)fclose(fscript); 326 (void)close(master); 327 } else { 328 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 329 (void)printf("Script done, output file is %s\n", fname); 330 } 331 exit(eval); 332 } 333