Annotation of src/usr.bin/script/script.c, Revision 1.33
1.33 ! deraadt 1: /* $OpenBSD: script.c,v 1.32 2015/10/20 14:55:21 semarie Exp $ */
1.1 deraadt 2: /* $NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $ */
3:
4: /*
1.16 deraadt 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: /*
1.1 deraadt 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.
1.18 millert 41: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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:
1.5 deraadt 74: #include <util.h>
1.7 mickey 75: #include <err.h>
1.5 deraadt 76:
1.1 deraadt 77: FILE *fscript;
78: int master, slave;
1.20 deraadt 79: volatile sig_atomic_t child;
80: pid_t subchild;
1.1 deraadt 81: char *fname;
82:
1.16 deraadt 83: volatile sig_atomic_t dead;
84: volatile sig_atomic_t sigdeadstatus;
85: volatile sig_atomic_t flush;
86:
1.1 deraadt 87: struct termios tt;
1.33 ! deraadt 88: int istty;
1.1 deraadt 89:
1.17 millert 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);
1.1 deraadt 97:
98: int
1.19 deraadt 99: main(int argc, char *argv[])
1.1 deraadt 100: {
1.21 mickey 101: extern char *__progname;
1.16 deraadt 102: struct sigaction sa;
1.1 deraadt 103: struct winsize win;
1.16 deraadt 104: char ibuf[BUFSIZ];
105: ssize_t cc, off;
1.1 deraadt 106: int aflg, ch;
107:
108: aflg = 0;
1.3 millert 109: while ((ch = getopt(argc, argv, "a")) != -1)
1.1 deraadt 110: switch(ch) {
111: case 'a':
112: aflg = 1;
113: break;
114: default:
1.21 mickey 115: fprintf(stderr, "usage: %s [-a] [file]\n", __progname);
1.1 deraadt 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)
1.13 millert 127: err(1, "%s", fname);
1.1 deraadt 128:
1.33 ! deraadt 129: if (isatty(0)) {
! 130: if (tcgetattr(STDIN_FILENO, &tt) == 0 &&
! 131: ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == 0)
! 132: istty = 1;
! 133: }
1.1 deraadt 134: if (openpty(&master, &slave, NULL, &tt, &win) == -1)
1.7 mickey 135: err(1, "openpty");
1.1 deraadt 136:
137: (void)printf("Script started, output file is %s\n", fname);
1.33 ! deraadt 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: }
1.1 deraadt 145:
1.16 deraadt 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:
1.1 deraadt 152: child = fork();
153: if (child < 0) {
1.21 mickey 154: warn("fork");
1.1 deraadt 155: fail();
156: }
157: if (child == 0) {
158: subchild = child = fork();
159: if (child < 0) {
1.21 mickey 160: warn("fork");
1.1 deraadt 161: fail();
162: }
163: if (child)
164: dooutput();
165: else
166: doshell();
167: }
168:
1.27 deraadt 169: bzero(&sa, sizeof sa);
170: sigemptyset(&sa.sa_mask);
171: sa.sa_handler = finish;
172: (void)sigaction(SIGCHLD, &sa, NULL);
173:
1.32 semarie 174: if (pledge("stdio proc tty", NULL) == -1)
1.31 deraadt 175: err(1, "pledge");
1.28 deraadt 176:
1.1 deraadt 177: (void)fclose(fscript);
1.16 deraadt 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);
1.24 deraadt 188: if (n == -1 && errno != EAGAIN)
189: break;
1.16 deraadt 190: if (n == 0)
191: break; /* skip writing */
192: if (n > 0)
193: off += n;
194: }
195: }
196: done(sigdeadstatus);
1.1 deraadt 197: }
198:
1.20 deraadt 199: /* ARGSUSED */
1.1 deraadt 200: void
1.19 deraadt 201: finish(int signo)
1.1 deraadt 202: {
1.8 deraadt 203: int save_errno = errno;
1.16 deraadt 204: int status, e = 1;
205: pid_t pid;
1.1 deraadt 206:
1.16 deraadt 207: while ((pid = wait3(&status, WNOHANG, 0)) > 0) {
1.20 deraadt 208: if (pid == (pid_t)child) {
1.11 ericj 209: if (WIFEXITED(status))
1.16 deraadt 210: e = WEXITSTATUS(status);
1.11 ericj 211: }
1.16 deraadt 212: }
213: dead = 1;
214: sigdeadstatus = e;
1.12 espie 215: errno = save_errno;
216: }
217:
1.20 deraadt 218: /* ARGSUSED */
1.12 espie 219: void
1.19 deraadt 220: handlesigwinch(int signo)
1.12 espie 221: {
1.16 deraadt 222: int save_errno = errno;
1.12 espie 223: struct winsize win;
224: pid_t pgrp;
225:
226: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) {
1.16 deraadt 227: ioctl(slave, TIOCSWINSZ, &win);
228: if (ioctl(slave, TIOCGPGRP, &pgrp) != -1)
229: killpg(pgrp, SIGWINCH);
1.12 espie 230: }
1.8 deraadt 231: errno = save_errno;
1.1 deraadt 232: }
233:
234: void
1.19 deraadt 235: dooutput(void)
1.1 deraadt 236: {
1.16 deraadt 237: struct sigaction sa;
1.1 deraadt 238: struct itimerval value;
1.22 millert 239: sigset_t blkalrm;
1.16 deraadt 240: char obuf[BUFSIZ];
1.1 deraadt 241: time_t tvec;
1.16 deraadt 242: ssize_t outcc = 0, cc, off;
1.1 deraadt 243:
244: (void)close(STDIN_FILENO);
245: tvec = time(NULL);
246: (void)fprintf(fscript, "Script started on %s", ctime(&tvec));
247:
1.22 millert 248: sigemptyset(&blkalrm);
249: sigaddset(&blkalrm, SIGALRM);
1.16 deraadt 250: bzero(&sa, sizeof sa);
251: sigemptyset(&sa.sa_mask);
252: sa.sa_handler = scriptflush;
253: (void)sigaction(SIGALRM, &sa, NULL);
1.27 deraadt 254:
255: bzero(&sa, sizeof sa);
256: sigemptyset(&sa.sa_mask);
257: sa.sa_handler = SIG_IGN;
258: (void)sigaction(SIGCHLD, &sa, NULL);
1.28 deraadt 259:
1.32 semarie 260: if (pledge("stdio proc", NULL) == -1)
1.31 deraadt 261: err(1, "pledge");
1.16 deraadt 262:
1.26 millert 263: value.it_interval.tv_sec = 30;
1.1 deraadt 264: value.it_interval.tv_usec = 0;
265: value.it_value = value.it_interval;
266: (void)setitimer(ITIMER_REAL, &value, NULL);
267: for (;;) {
1.16 deraadt 268: if (flush) {
269: if (outcc) {
270: (void)fflush(fscript);
271: outcc = 0;
272: }
273: flush = 0;
274: }
1.1 deraadt 275: cc = read(master, obuf, sizeof (obuf));
1.16 deraadt 276: if (cc == -1 && errno == EINTR)
277: continue;
1.1 deraadt 278: if (cc <= 0)
279: break;
1.22 millert 280: sigprocmask(SIG_BLOCK, &blkalrm, NULL);
1.16 deraadt 281: for (off = 0; off < cc; ) {
1.23 deraadt 282: ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off);
1.24 deraadt 283: if (n == -1 && errno != EAGAIN)
284: break;
1.16 deraadt 285: if (n == 0)
286: break; /* skip writing */
287: if (n > 0)
288: off += n;
289: }
1.1 deraadt 290: (void)fwrite(obuf, 1, cc, fscript);
291: outcc += cc;
1.22 millert 292: sigprocmask(SIG_UNBLOCK, &blkalrm, NULL);
1.1 deraadt 293: }
1.11 ericj 294: done(0);
1.1 deraadt 295: }
296:
1.20 deraadt 297: /* ARGSUSED */
1.1 deraadt 298: void
1.19 deraadt 299: scriptflush(int signo)
1.1 deraadt 300: {
1.16 deraadt 301: flush = 1;
1.1 deraadt 302: }
303:
304: void
1.19 deraadt 305: doshell(void)
1.1 deraadt 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);
1.15 deraadt 316: execl(shell, shell, "-i", (char *)NULL);
1.21 mickey 317: warn("%s", shell);
1.1 deraadt 318: fail();
319: }
320:
321: void
1.19 deraadt 322: fail(void)
1.1 deraadt 323: {
324:
325: (void)kill(0, SIGTERM);
1.11 ericj 326: done(1);
1.1 deraadt 327: }
328:
329: void
1.19 deraadt 330: done(int eval)
1.1 deraadt 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 {
1.33 ! deraadt 340: if (istty)
! 341: (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
1.1 deraadt 342: (void)printf("Script done, output file is %s\n", fname);
343: }
1.11 ericj 344: exit(eval);
1.1 deraadt 345: }
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