1 /* $OpenBSD: script.c,v 1.35 2019/06/28 13:35:03 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(char *); 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 char *cmd; 106 ssize_t cc, off; 107 int aflg, ch; 108 109 cmd = NULL; 110 aflg = 0; 111 while ((ch = getopt(argc, argv, "ac:")) != -1) 112 switch(ch) { 113 case 'a': 114 aflg = 1; 115 break; 116 case 'c': 117 cmd = optarg; 118 break; 119 default: 120 fprintf(stderr, "usage: %s [-a] [-c command] [file]\n", 121 __progname); 122 exit(1); 123 } 124 argc -= optind; 125 argv += optind; 126 127 if (argc > 0) 128 fname = argv[0]; 129 else 130 fname = "typescript"; 131 132 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) 133 err(1, "%s", fname); 134 135 if (isatty(0)) { 136 if (tcgetattr(STDIN_FILENO, &tt) == 0 && 137 ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == 0) 138 istty = 1; 139 } 140 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 141 err(1, "openpty"); 142 143 (void)printf("Script started, output file is %s\n", fname); 144 if (istty) { 145 struct termios rtt = tt; 146 147 cfmakeraw(&rtt); 148 rtt.c_lflag &= ~ECHO; 149 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 150 } 151 152 bzero(&sa, sizeof sa); 153 sigemptyset(&sa.sa_mask); 154 sa.sa_handler = handlesigwinch; 155 sa.sa_flags = SA_RESTART; 156 (void)sigaction(SIGWINCH, &sa, NULL); 157 158 child = fork(); 159 if (child == -1) { 160 warn("fork"); 161 fail(); 162 } 163 if (child == 0) { 164 subchild = child = fork(); 165 if (child == -1) { 166 warn("fork"); 167 fail(); 168 } 169 if (child) 170 dooutput(); 171 else 172 doshell(cmd); 173 } 174 175 bzero(&sa, sizeof sa); 176 sigemptyset(&sa.sa_mask); 177 sa.sa_handler = finish; 178 (void)sigaction(SIGCHLD, &sa, NULL); 179 180 if (pledge("stdio proc tty", NULL) == -1) 181 err(1, "pledge"); 182 183 (void)fclose(fscript); 184 while (1) { 185 if (dead) 186 break; 187 cc = read(STDIN_FILENO, ibuf, BUFSIZ); 188 if (cc == -1 && errno == EINTR) 189 continue; 190 if (cc <= 0) 191 break; 192 for (off = 0; off < cc; ) { 193 ssize_t n = write(master, ibuf + off, cc - off); 194 if (n == -1 && errno != EAGAIN) 195 break; 196 if (n == 0) 197 break; /* skip writing */ 198 if (n > 0) 199 off += n; 200 } 201 } 202 done(sigdeadstatus); 203 } 204 205 void 206 finish(int signo) 207 { 208 int save_errno = errno; 209 int status, e = 1; 210 pid_t pid; 211 212 while ((pid = wait3(&status, WNOHANG, 0)) > 0) { 213 if (pid == (pid_t)child) { 214 if (WIFEXITED(status)) 215 e = WEXITSTATUS(status); 216 } 217 } 218 dead = 1; 219 sigdeadstatus = e; 220 errno = save_errno; 221 } 222 223 void 224 handlesigwinch(int signo) 225 { 226 int save_errno = errno; 227 struct winsize win; 228 pid_t pgrp; 229 230 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) { 231 ioctl(slave, TIOCSWINSZ, &win); 232 if (ioctl(slave, TIOCGPGRP, &pgrp) != -1) 233 killpg(pgrp, SIGWINCH); 234 } 235 errno = save_errno; 236 } 237 238 void 239 dooutput(void) 240 { 241 struct sigaction sa; 242 struct itimerval value; 243 sigset_t blkalrm; 244 char obuf[BUFSIZ]; 245 time_t tvec; 246 ssize_t outcc = 0, cc, off; 247 248 (void)close(STDIN_FILENO); 249 tvec = time(NULL); 250 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 251 252 sigemptyset(&blkalrm); 253 sigaddset(&blkalrm, SIGALRM); 254 bzero(&sa, sizeof sa); 255 sigemptyset(&sa.sa_mask); 256 sa.sa_handler = scriptflush; 257 (void)sigaction(SIGALRM, &sa, NULL); 258 259 bzero(&sa, sizeof sa); 260 sigemptyset(&sa.sa_mask); 261 sa.sa_handler = SIG_IGN; 262 (void)sigaction(SIGCHLD, &sa, NULL); 263 264 if (pledge("stdio proc", NULL) == -1) 265 err(1, "pledge"); 266 267 value.it_interval.tv_sec = 30; 268 value.it_interval.tv_usec = 0; 269 value.it_value = value.it_interval; 270 (void)setitimer(ITIMER_REAL, &value, NULL); 271 for (;;) { 272 if (flush) { 273 if (outcc) { 274 (void)fflush(fscript); 275 outcc = 0; 276 } 277 flush = 0; 278 } 279 cc = read(master, obuf, sizeof (obuf)); 280 if (cc == -1 && errno == EINTR) 281 continue; 282 if (cc <= 0) 283 break; 284 sigprocmask(SIG_BLOCK, &blkalrm, NULL); 285 for (off = 0; off < cc; ) { 286 ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off); 287 if (n == -1 && errno != EAGAIN) 288 break; 289 if (n == 0) 290 break; /* skip writing */ 291 if (n > 0) 292 off += n; 293 } 294 (void)fwrite(obuf, 1, cc, fscript); 295 outcc += cc; 296 sigprocmask(SIG_UNBLOCK, &blkalrm, NULL); 297 } 298 done(0); 299 } 300 301 void 302 scriptflush(int signo) 303 { 304 flush = 1; 305 } 306 307 void 308 doshell(char *cmd) 309 { 310 char *shell; 311 char *argp[] = {"sh", "-c", NULL, NULL}; 312 313 shell = getenv("SHELL"); 314 if (shell == NULL) 315 shell = _PATH_BSHELL; 316 317 (void)close(master); 318 (void)fclose(fscript); 319 login_tty(slave); 320 321 if (cmd != NULL) { 322 argp[2] = cmd; 323 execv(_PATH_BSHELL, argp); 324 warn("unable to execute %s", _PATH_BSHELL); 325 } else { 326 execl(shell, shell, "-i", (char *)NULL); 327 warn("%s", shell); 328 } 329 fail(); 330 } 331 332 void 333 fail(void) 334 { 335 336 (void)kill(0, SIGTERM); 337 done(1); 338 } 339 340 void 341 done(int eval) 342 { 343 time_t tvec; 344 345 if (subchild) { 346 tvec = time(NULL); 347 (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec)); 348 (void)fclose(fscript); 349 (void)close(master); 350 } else { 351 if (istty) 352 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 353 (void)printf("Script done, output file is %s\n", fname); 354 } 355 exit(eval); 356 } 357