1 /* $NetBSD: script.c,v 1.12 2006/06/14 16:05:38 liamjfoy Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 __RCSID("$NetBSD: script.c,v 1.12 2006/06/14 16:05:38 liamjfoy Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/wait.h> 47 #include <sys/stat.h> 48 #include <sys/ioctl.h> 49 #include <sys/time.h> 50 #include <sys/param.h> 51 #include <sys/uio.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <paths.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <termios.h> 62 #include <time.h> 63 #include <tzfile.h> 64 #include <unistd.h> 65 #include <util.h> 66 67 #define DEF_BUF 65536 68 69 struct stamp { 70 uint64_t scr_len; /* amount of data */ 71 uint64_t scr_sec; /* time it arrived in seconds... */ 72 uint32_t scr_usec; /* ...and microseconds */ 73 uint32_t scr_direction; /* 'i', 'o', etc (also indicates endianness) */ 74 }; 75 76 FILE *fscript; 77 int master, slave; 78 int child, subchild; 79 int outcc; 80 int usesleep, rawout; 81 char *fname; 82 83 struct termios tt; 84 85 void done(void); 86 void dooutput(void); 87 void doshell(void); 88 void fail(void); 89 void finish(int); 90 int main(int, char **); 91 void scriptflush(int); 92 void record(FILE *, char *, size_t, int); 93 void playback(FILE *); 94 95 int 96 main(int argc, char *argv[]) 97 { 98 int cc; 99 struct termios rtt; 100 struct winsize win; 101 int aflg, pflg, ch; 102 char ibuf[BUFSIZ]; 103 104 aflg = 0; 105 pflg = 0; 106 usesleep = 1; 107 rawout = 0; 108 while ((ch = getopt(argc, argv, "adpr")) != -1) 109 switch(ch) { 110 case 'a': 111 aflg = 1; 112 break; 113 case 'd': 114 usesleep = 0; 115 break; 116 case 'p': 117 pflg = 1; 118 break; 119 case 'r': 120 rawout = 1; 121 break; 122 case '?': 123 default: 124 (void)fprintf(stderr, "usage: %s [-adpr] [file]\n", 125 getprogname()); 126 exit(1); 127 } 128 argc -= optind; 129 argv += optind; 130 131 if (argc > 0) 132 fname = argv[0]; 133 else 134 fname = "typescript"; 135 136 if ((fscript = fopen(fname, pflg ? "r" : aflg ? "a" : "w")) == NULL) 137 err(1, "fopen %s", fname); 138 139 if (pflg) 140 playback(fscript); 141 142 (void)tcgetattr(STDIN_FILENO, &tt); 143 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win); 144 if (openpty(&master, &slave, NULL, &tt, &win) == -1) 145 err(1, "openpty"); 146 147 (void)printf("Script started, output file is %s\n", fname); 148 rtt = tt; 149 cfmakeraw(&rtt); 150 rtt.c_lflag &= ~ECHO; 151 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt); 152 153 (void)signal(SIGCHLD, finish); 154 child = fork(); 155 if (child < 0) { 156 warn("fork"); 157 fail(); 158 } 159 if (child == 0) { 160 subchild = child = fork(); 161 if (child < 0) { 162 warn("fork"); 163 fail(); 164 } 165 if (child) 166 dooutput(); 167 else 168 doshell(); 169 } 170 171 if (!rawout) 172 (void)fclose(fscript); 173 while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0) { 174 if (rawout) 175 record(fscript, ibuf, cc, 'i'); 176 (void)write(master, ibuf, cc); 177 } 178 done(); 179 /* NOTREACHED */ 180 return (0); 181 } 182 183 void 184 finish(int signo) 185 { 186 int die, pid, status; 187 188 die = 0; 189 while ((pid = wait3(&status, WNOHANG, 0)) > 0) 190 if (pid == child) 191 die = 1; 192 193 if (die) 194 done(); 195 } 196 197 void 198 dooutput() 199 { 200 struct itimerval value; 201 int cc; 202 time_t tvec; 203 char obuf[BUFSIZ]; 204 205 (void)close(STDIN_FILENO); 206 tvec = time(NULL); 207 if (rawout) 208 record(fscript, NULL, 0, 's'); 209 else 210 (void)fprintf(fscript, "Script started on %s", ctime(&tvec)); 211 212 (void)signal(SIGALRM, scriptflush); 213 value.it_interval.tv_sec = SECSPERMIN / 2; 214 value.it_interval.tv_usec = 0; 215 value.it_value = value.it_interval; 216 (void)setitimer(ITIMER_REAL, &value, NULL); 217 for (;;) { 218 cc = read(master, obuf, sizeof (obuf)); 219 if (cc <= 0) 220 break; 221 (void)write(1, obuf, cc); 222 if (rawout) 223 record(fscript, obuf, cc, 'o'); 224 else 225 (void)fwrite(obuf, 1, cc, fscript); 226 outcc += cc; 227 } 228 done(); 229 } 230 231 void 232 scriptflush(int signo) 233 { 234 if (outcc) { 235 (void)fflush(fscript); 236 outcc = 0; 237 } 238 } 239 240 void 241 doshell() 242 { 243 char *shell; 244 245 shell = getenv("SHELL"); 246 if (shell == NULL) 247 shell = _PATH_BSHELL; 248 249 (void)close(master); 250 (void)fclose(fscript); 251 login_tty(slave); 252 execl(shell, shell, "-i", NULL); 253 warn("execl %s", shell); 254 fail(); 255 } 256 257 void 258 fail() 259 { 260 261 (void)kill(0, SIGTERM); 262 done(); 263 } 264 265 void 266 done() 267 { 268 time_t tvec; 269 270 if (subchild) { 271 tvec = time(NULL); 272 if (rawout) 273 record(fscript, NULL, 0, 'e'); 274 else 275 (void)fprintf(fscript,"\nScript done on %s", 276 ctime(&tvec)); 277 (void)fclose(fscript); 278 (void)close(master); 279 } else { 280 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt); 281 (void)printf("Script done, output file is %s\n", fname); 282 } 283 exit(0); 284 } 285 286 void 287 record(FILE *fscript, char *buf, size_t cc, int direction) 288 { 289 struct iovec iov[2]; 290 struct stamp stamp; 291 struct timeval tv; 292 293 (void)gettimeofday(&tv, NULL); 294 stamp.scr_len = cc; 295 stamp.scr_sec = tv.tv_sec; 296 stamp.scr_usec = tv.tv_usec; 297 stamp.scr_direction = direction; 298 iov[0].iov_len = sizeof(stamp); 299 iov[0].iov_base = &stamp; 300 iov[1].iov_len = cc; 301 iov[1].iov_base = buf; 302 if (writev(fileno(fscript), &iov[0], 2) == -1) 303 err(1, "writev"); 304 } 305 306 #define swapstamp(stamp) do { \ 307 if (stamp.scr_direction > 0xff) { \ 308 stamp.scr_len = bswap64(stamp.scr_len); \ 309 stamp.scr_sec = bswap64(stamp.scr_sec); \ 310 stamp.scr_usec = bswap32(stamp.scr_usec); \ 311 stamp.scr_direction = bswap32(stamp.scr_direction); \ 312 } \ 313 } while (0/*CONSTCOND*/) 314 315 void 316 playback(FILE *fscript) 317 { 318 struct timespec tsi, tso; 319 struct stamp stamp; 320 struct stat playback_stat; 321 char buf[DEF_BUF]; 322 off_t nread, save_len; 323 size_t l; 324 time_t clock; 325 326 if (fstat(fileno(fscript), &playback_stat) == -1) 327 err(1, "fstat failed"); 328 329 for (nread = 0; nread < playback_stat.st_size; nread += save_len) { 330 if (fread(&stamp, sizeof(stamp), 1, fscript) != 1) 331 err(1, "reading playback header"); 332 swapstamp(stamp); 333 save_len = sizeof(stamp); 334 335 if (stamp.scr_len > 336 (uint64_t)(playback_stat.st_size - save_len) - nread) 337 err(1, "invalid stamp"); 338 339 save_len += stamp.scr_len; 340 clock = stamp.scr_sec; 341 tso.tv_sec = stamp.scr_sec; 342 tso.tv_nsec = stamp.scr_usec * 1000; 343 344 switch (stamp.scr_direction) { 345 case 's': 346 (void)printf("Script started on %s", ctime(&clock)); 347 tsi = tso; 348 fseek(fscript, stamp.scr_len, SEEK_CUR); 349 break; 350 case 'e': 351 (void)printf("\nScript done on %s", ctime(&clock)); 352 fseek(fscript, stamp.scr_len, SEEK_CUR); 353 break; 354 case 'i': 355 /* throw input away */ 356 fseek(fscript, stamp.scr_len, SEEK_CUR); 357 break; 358 case 'o': 359 tsi.tv_sec = tso.tv_sec - tsi.tv_sec; 360 tsi.tv_nsec = tso.tv_nsec - tsi.tv_nsec; 361 if (tsi.tv_nsec < 0) { 362 tsi.tv_sec -= 1; 363 tsi.tv_nsec += 1000000000; 364 } 365 if (usesleep) 366 (void)nanosleep(&tsi, NULL); 367 tsi = tso; 368 while (stamp.scr_len > 0) { 369 l = MIN(DEF_BUF, stamp.scr_len); 370 if (fread(buf, sizeof(char), l, fscript) != l) 371 err(1, "cannot read buffer"); 372 373 (void)write(STDOUT_FILENO, buf, l); 374 stamp.scr_len -= l; 375 } 376 break; 377 default: 378 err(1, "invalid direction"); 379 } 380 } 381 (void)fclose(fscript); 382 exit(0); 383 } 384