1 /* $OpenBSD: script.c,v 1.33 2017/04/12 14:49:05 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 int istty; 89 90 __dead void done(int); 91 void dooutput(void); 92 void doshell(void); 93 void fail(void); 94 void finish(int); 95 void scriptflush(int); 96 void handlesigwinch(int); 97 98 int 99 main(int argc, char *argv[]) 100 { 101 extern char *__progname; 102 struct sigaction sa; 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 if (isatty(0)) { 130 if (tcgetattr(STDIN_FILENO, &tt) == 0 && 131 ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == 0) 132 istty = 1; 133 } 134 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 135 err(1, "openpty"); 136 137 (void)printf("Script started, output file is %s\n", fname); 138 if (istty) { 139 struct termios rtt = tt; 140 141 cfmakeraw(&rtt); 142 rtt.c_lflag &= ~ECHO; 143 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 144 } 145 146 bzero(&sa, sizeof sa); 147 sigemptyset(&sa.sa_mask); 148 sa.sa_handler = handlesigwinch; 149 sa.sa_flags = SA_RESTART; 150 (void)sigaction(SIGWINCH, &sa, NULL); 151 152 child = fork(); 153 if (child < 0) { 154 warn("fork"); 155 fail(); 156 } 157 if (child == 0) { 158 subchild = child = fork(); 159 if (child < 0) { 160 warn("fork"); 161 fail(); 162 } 163 if (child) 164 dooutput(); 165 else 166 doshell(); 167 } 168 169 bzero(&sa, sizeof sa); 170 sigemptyset(&sa.sa_mask); 171 sa.sa_handler = finish; 172 (void)sigaction(SIGCHLD, &sa, NULL); 173 174 if (pledge("stdio proc tty", NULL) == -1) 175 err(1, "pledge"); 176 177 (void)fclose(fscript); 178 while (1) { 179 if (dead) 180 break; 181 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 182 if (cc == -1 && errno == EINTR) 183 continue; 184 if (cc <= 0) 185 break; 186 for (off = 0; off < cc; ) { 187 ssize_t n = write(master, ibuf + off, cc - off); 188 if (n == -1 && errno != EAGAIN) 189 break; 190 if (n == 0) 191 break; /* skip writing */ 192 if (n > 0) 193 off += n; 194 } 195 } 196 done(sigdeadstatus); 197 } 198 199 /* ARGSUSED */ 200 void 201 finish(int signo) 202 { 203 int save_errno = errno; 204 int status, e = 1; 205 pid_t pid; 206 207 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 208 if (pid == (pid_t)child) { 209 if (WIFEXITED(status)) 210 e = WEXITSTATUS(status); 211 } 212 } 213 dead = 1; 214 sigdeadstatus = e; 215 errno = save_errno; 216 } 217 218 /* ARGSUSED */ 219 void 220 handlesigwinch(int signo) 221 { 222 int save_errno = errno; 223 struct winsize win; 224 pid_t pgrp; 225 226 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 227 ioctl(slave, TIOCSWINSZ, &win); 228 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 229 killpg(pgrp, SIGWINCH); 230 } 231 errno = save_errno; 232 } 233 234 void 235 dooutput(void) 236 { 237 struct sigaction sa; 238 struct itimerval value; 239 sigset_t blkalrm; 240 char obuf[BUFSIZ]; 241 time_t tvec; 242 ssize_t outcc = 0, cc, off; 243 244 (void)close(STDIN_FILENO); 245 tvec = time(NULL); 246 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 247 248 sigemptyset(&blkalrm); 249 sigaddset(&blkalrm, SIGALRM); 250 bzero(&sa, sizeof sa); 251 sigemptyset(&sa.sa_mask); 252 sa.sa_handler = scriptflush; 253 (void)sigaction(SIGALRM, &sa, NULL); 254 255 bzero(&sa, sizeof sa); 256 sigemptyset(&sa.sa_mask); 257 sa.sa_handler = SIG_IGN; 258 (void)sigaction(SIGCHLD, &sa, NULL); 259 260 if (pledge("stdio proc", NULL) == -1) 261 err(1, "pledge"); 262 263 value.it_interval.tv_sec = 30; 264 value.it_interval.tv_usec = 0; 265 value.it_value = value.it_interval; 266 (void)setitimer(ITIMER_REAL, &value, NULL); 267 for (;;) { 268 if (flush) { 269 if (outcc) { 270 (void)fflush(fscript); 271 outcc = 0; 272 } 273 flush = 0; 274 } 275 cc = read(master, obuf, sizeof (obuf)); 276 if (cc == -1 && errno == EINTR) 277 continue; 278 if (cc <= 0) 279 break; 280 sigprocmask(SIG_BLOCK, &blkalrm, NULL); 281 for (off = 0; off < cc; ) { 282 ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); 283 if (n == -1 && errno != EAGAIN) 284 break; 285 if (n == 0) 286 break; /* skip writing */ 287 if (n > 0) 288 off += n; 289 } 290 (void)fwrite(obuf, 1, cc, fscript); 291 outcc += cc; 292 sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); 293 } 294 done(0); 295 } 296 297 /* ARGSUSED */ 298 void 299 scriptflush(int signo) 300 { 301 flush = 1; 302 } 303 304 void 305 doshell(void) 306 { 307 char *shell; 308 309 shell = getenv("SHELL"); 310 if (shell == NULL) 311 shell = _PATH_BSHELL; 312 313 (void)close(master); 314 (void)fclose(fscript); 315 login_tty(slave); 316 execl(shell, shell, "-i", (char *)NULL); 317 warn("%s", shell); 318 fail(); 319 } 320 321 void 322 fail(void) 323 { 324 325 (void)kill(0, SIGTERM); 326 done(1); 327 } 328 329 void 330 done(int eval) 331 { 332 time_t tvec; 333 334 if (subchild) { 335 tvec = time(NULL); 336 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 337 (void)fclose(fscript); 338 (void)close(master); 339 } else { 340 if (istty) 341 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 342 (void)printf("Script done, output file is %s\n", fname); 343 } 344 exit(eval); 345 } 346