1 /* $OpenBSD: script.c,v 1.25 2009/10/27 23:59:43 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 <tzfile.h> 73 #include <unistd.h> 74 75 #include <util.h> 76 #include <err.h> 77 78 FILE *fscript; 79 int master, slave; 80 volatile sig_atomic_t child; 81 pid_t subchild; 82 char *fname; 83 84 volatile sig_atomic_t dead; 85 volatile sig_atomic_t sigdeadstatus; 86 volatile sig_atomic_t flush; 87 88 struct termios tt; 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 termios rtt; 104 struct winsize win; 105 char ibuf[BUFSIZ]; 106 ssize_t cc, off; 107 int aflg, ch; 108 109 aflg = 0; 110 while ((ch = getopt(argc, argv, "a")) != -1) 111 switch(ch) { 112 case 'a': 113 aflg = 1; 114 break; 115 default: 116 fprintf(stderr, "usage: %s [-a] [file]\n", __progname); 117 exit(1); 118 } 119 argc -= optind; 120 argv += optind; 121 122 if (argc > 0) 123 fname = argv[0]; 124 else 125 fname = "typescript"; 126 127 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 128 err(1, "%s", fname); 129 130 (void)tcgetattr(STDIN_FILENO, &tt); 131 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 132 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 133 err(1, "openpty"); 134 135 (void)printf("Script started, output file is %s\n", fname); 136 rtt = tt; 137 cfmakeraw(&rtt); 138 rtt.c_lflag &= ~ECHO; 139 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 140 141 bzero(&sa, sizeof sa); 142 sigemptyset(&sa.sa_mask); 143 sa.sa_handler = finish; 144 (void)sigaction(SIGCHLD, &sa, NULL); 145 146 sa.sa_handler = handlesigwinch; 147 sa.sa_flags = SA_RESTART; 148 (void)sigaction(SIGWINCH, &sa, NULL); 149 150 child = fork(); 151 if (child < 0) { 152 warn("fork"); 153 fail(); 154 } 155 if (child == 0) { 156 subchild = child = fork(); 157 if (child < 0) { 158 warn("fork"); 159 fail(); 160 } 161 if (child) 162 dooutput(); 163 else 164 doshell(); 165 } 166 167 (void)fclose(fscript); 168 while (1) { 169 if (dead) 170 break; 171 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 172 if (cc == -1 && errno == EINTR) 173 continue; 174 if (cc <= 0) 175 break; 176 for (off = 0; off < cc; ) { 177 ssize_t n = write(master, ibuf + off, cc - off); 178 if (n == -1 && errno != EAGAIN) 179 break; 180 if (n == 0) 181 break; /* skip writing */ 182 if (n > 0) 183 off += n; 184 } 185 } 186 done(sigdeadstatus); 187 } 188 189 /* ARGSUSED */ 190 void 191 finish(int signo) 192 { 193 int save_errno = errno; 194 int status, e = 1; 195 pid_t pid; 196 197 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 198 if (pid == (pid_t)child) { 199 if (WIFEXITED(status)) 200 e = WEXITSTATUS(status); 201 } 202 } 203 dead = 1; 204 sigdeadstatus = e; 205 errno = save_errno; 206 } 207 208 /* ARGSUSED */ 209 void 210 handlesigwinch(int signo) 211 { 212 int save_errno = errno; 213 struct winsize win; 214 pid_t pgrp; 215 216 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 217 ioctl(slave, TIOCSWINSZ, &win); 218 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 219 killpg(pgrp, SIGWINCH); 220 } 221 errno = save_errno; 222 } 223 224 void 225 dooutput(void) 226 { 227 struct sigaction sa; 228 struct itimerval value; 229 sigset_t blkalrm; 230 char obuf[BUFSIZ]; 231 time_t tvec; 232 ssize_t outcc = 0, cc, off; 233 234 (void)close(STDIN_FILENO); 235 tvec = time(NULL); 236 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 237 238 sigemptyset(&blkalrm); 239 sigaddset(&blkalrm, SIGALRM); 240 bzero(&sa, sizeof sa); 241 sigemptyset(&sa.sa_mask); 242 sa.sa_handler = scriptflush; 243 (void)sigaction(SIGALRM, &sa, NULL); 244 245 value.it_interval.tv_sec = SECSPERMIN / 2; 246 value.it_interval.tv_usec = 0; 247 value.it_value = value.it_interval; 248 (void)setitimer(ITIMER_REAL, &value, NULL); 249 for (;;) { 250 if (flush) { 251 if (outcc) { 252 (void)fflush(fscript); 253 outcc = 0; 254 } 255 flush = 0; 256 } 257 cc = read(master, obuf, sizeof (obuf)); 258 if (cc == -1 && errno == EINTR) 259 continue; 260 if (cc <= 0) 261 break; 262 sigprocmask(SIG_BLOCK, &blkalrm, NULL); 263 for (off = 0; off < cc; ) { 264 ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); 265 if (n == -1 && errno != EAGAIN) 266 break; 267 if (n == 0) 268 break; /* skip writing */ 269 if (n > 0) 270 off += n; 271 } 272 (void)fwrite(obuf, 1, cc, fscript); 273 outcc += cc; 274 sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); 275 } 276 done(0); 277 } 278 279 /* ARGSUSED */ 280 void 281 scriptflush(int signo) 282 { 283 flush = 1; 284 } 285 286 void 287 doshell(void) 288 { 289 char *shell; 290 291 shell = getenv("SHELL"); 292 if (shell == NULL) 293 shell = _PATH_BSHELL; 294 295 (void)close(master); 296 (void)fclose(fscript); 297 login_tty(slave); 298 execl(shell, shell, "-i", (char *)NULL); 299 warn("%s", shell); 300 fail(); 301 } 302 303 void 304 fail(void) 305 { 306 307 (void)kill(0, SIGTERM); 308 done(1); 309 } 310 311 void 312 done(int eval) 313 { 314 time_t tvec; 315 316 if (subchild) { 317 tvec = time(NULL); 318 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 319 (void)fclose(fscript); 320 (void)close(master); 321 } else { 322 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 323 (void)printf("Script done, output file is %s\n", fname); 324 } 325 exit(eval); 326 } 327