1 /* $OpenBSD: script.c,v 1.26 2015/03/15 00:41:28 millert 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 = finish; 143 (void)sigaction(SIGCHLD, &sa, NULL); 144 145 sa.sa_handler = handlesigwinch; 146 sa.sa_flags = SA_RESTART; 147 (void)sigaction(SIGWINCH, &sa, NULL); 148 149 child = fork(); 150 if (child < 0) { 151 warn("fork"); 152 fail(); 153 } 154 if (child == 0) { 155 subchild = child = fork(); 156 if (child < 0) { 157 warn("fork"); 158 fail(); 159 } 160 if (child) 161 dooutput(); 162 else 163 doshell(); 164 } 165 166 (void)fclose(fscript); 167 while (1) { 168 if (dead) 169 break; 170 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 171 if (cc == -1 && errno == EINTR) 172 continue; 173 if (cc <= 0) 174 break; 175 for (off = 0; off < cc; ) { 176 ssize_t n = write(master, ibuf + off, cc - off); 177 if (n == -1 && errno != EAGAIN) 178 break; 179 if (n == 0) 180 break; /* skip writing */ 181 if (n > 0) 182 off += n; 183 } 184 } 185 done(sigdeadstatus); 186 } 187 188 /* ARGSUSED */ 189 void 190 finish(int signo) 191 { 192 int save_errno = errno; 193 int status, e = 1; 194 pid_t pid; 195 196 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 197 if (pid == (pid_t)child) { 198 if (WIFEXITED(status)) 199 e = WEXITSTATUS(status); 200 } 201 } 202 dead = 1; 203 sigdeadstatus = e; 204 errno = save_errno; 205 } 206 207 /* ARGSUSED */ 208 void 209 handlesigwinch(int signo) 210 { 211 int save_errno = errno; 212 struct winsize win; 213 pid_t pgrp; 214 215 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 216 ioctl(slave, TIOCSWINSZ, &win); 217 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 218 killpg(pgrp, SIGWINCH); 219 } 220 errno = save_errno; 221 } 222 223 void 224 dooutput(void) 225 { 226 struct sigaction sa; 227 struct itimerval value; 228 sigset_t blkalrm; 229 char obuf[BUFSIZ]; 230 time_t tvec; 231 ssize_t outcc = 0, cc, off; 232 233 (void)close(STDIN_FILENO); 234 tvec = time(NULL); 235 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 236 237 sigemptyset(&blkalrm); 238 sigaddset(&blkalrm, SIGALRM); 239 bzero(&sa, sizeof sa); 240 sigemptyset(&sa.sa_mask); 241 sa.sa_handler = scriptflush; 242 (void)sigaction(SIGALRM, &sa, NULL); 243 244 value.it_interval.tv_sec = 30; 245 value.it_interval.tv_usec = 0; 246 value.it_value = value.it_interval; 247 (void)setitimer(ITIMER_REAL, &value, NULL); 248 for (;;) { 249 if (flush) { 250 if (outcc) { 251 (void)fflush(fscript); 252 outcc = 0; 253 } 254 flush = 0; 255 } 256 cc = read(master, obuf, sizeof (obuf)); 257 if (cc == -1 && errno == EINTR) 258 continue; 259 if (cc <= 0) 260 break; 261 sigprocmask(SIG_BLOCK, &blkalrm, NULL); 262 for (off = 0; off < cc; ) { 263 ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); 264 if (n == -1 && errno != EAGAIN) 265 break; 266 if (n == 0) 267 break; /* skip writing */ 268 if (n > 0) 269 off += n; 270 } 271 (void)fwrite(obuf, 1, cc, fscript); 272 outcc += cc; 273 sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); 274 } 275 done(0); 276 } 277 278 /* ARGSUSED */ 279 void 280 scriptflush(int signo) 281 { 282 flush = 1; 283 } 284 285 void 286 doshell(void) 287 { 288 char *shell; 289 290 shell = getenv("SHELL"); 291 if (shell == NULL) 292 shell = _PATH_BSHELL; 293 294 (void)close(master); 295 (void)fclose(fscript); 296 login_tty(slave); 297 execl(shell, shell, "-i", (char *)NULL); 298 warn("%s", shell); 299 fail(); 300 } 301 302 void 303 fail(void) 304 { 305 306 (void)kill(0, SIGTERM); 307 done(1); 308 } 309 310 void 311 done(int eval) 312 { 313 time_t tvec; 314 315 if (subchild) { 316 tvec = time(NULL); 317 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 318 (void)fclose(fscript); 319 (void)close(master); 320 } else { 321 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 322 (void)printf("Script done, output file is %s\n", fname); 323 } 324 exit(eval); 325 } 326