Annotation of src/usr.bin/script/script.c, Revision 1.31
1.31 ! deraadt 1: /* $OpenBSD: script.c,v 1.30 2015/10/07 05:08:27 deraadt 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;
88:
1.17 millert 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);
1.1 deraadt 96:
97: int
1.19 deraadt 98: main(int argc, char *argv[])
1.1 deraadt 99: {
1.21 mickey 100: extern char *__progname;
1.16 deraadt 101: struct sigaction sa;
1.1 deraadt 102: struct termios rtt;
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:
129: (void)tcgetattr(STDIN_FILENO, &tt);
130: (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
131: if (openpty(&master, &slave, NULL, &tt, &win) == -1)
1.7 mickey 132: err(1, "openpty");
1.1 deraadt 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:
1.16 deraadt 140: bzero(&sa, sizeof sa);
141: sigemptyset(&sa.sa_mask);
142: sa.sa_handler = handlesigwinch;
143: sa.sa_flags = SA_RESTART;
144: (void)sigaction(SIGWINCH, &sa, NULL);
145:
1.1 deraadt 146: child = fork();
147: if (child < 0) {
1.21 mickey 148: warn("fork");
1.1 deraadt 149: fail();
150: }
151: if (child == 0) {
152: subchild = child = fork();
153: if (child < 0) {
1.21 mickey 154: warn("fork");
1.1 deraadt 155: fail();
156: }
157: if (child)
158: dooutput();
159: else
160: doshell();
161: }
162:
1.27 deraadt 163: bzero(&sa, sizeof sa);
164: sigemptyset(&sa.sa_mask);
165: sa.sa_handler = finish;
166: (void)sigaction(SIGCHLD, &sa, NULL);
167:
1.31 ! deraadt 168: if (pledge("stdio tty", NULL) == -1)
! 169: err(1, "pledge");
1.28 deraadt 170:
1.1 deraadt 171: (void)fclose(fscript);
1.16 deraadt 172: while (1) {
173: if (dead)
174: break;
175: cc = read(STDIN_FILENO, ibuf, BUFSIZ);
176: if (cc == -1 && errno == EINTR)
177: continue;
178: if (cc <= 0)
179: break;
180: for (off = 0; off < cc; ) {
181: ssize_t n = write(master, ibuf + off, cc - off);
1.24 deraadt 182: if (n == -1 && errno != EAGAIN)
183: break;
1.16 deraadt 184: if (n == 0)
185: break; /* skip writing */
186: if (n > 0)
187: off += n;
188: }
189: }
190: done(sigdeadstatus);
1.1 deraadt 191: }
192:
1.20 deraadt 193: /* ARGSUSED */
1.1 deraadt 194: void
1.19 deraadt 195: finish(int signo)
1.1 deraadt 196: {
1.8 deraadt 197: int save_errno = errno;
1.16 deraadt 198: int status, e = 1;
199: pid_t pid;
1.1 deraadt 200:
1.16 deraadt 201: while ((pid = wait3(&status, WNOHANG, 0)) > 0) {
1.20 deraadt 202: if (pid == (pid_t)child) {
1.11 ericj 203: if (WIFEXITED(status))
1.16 deraadt 204: e = WEXITSTATUS(status);
1.11 ericj 205: }
1.16 deraadt 206: }
207: dead = 1;
208: sigdeadstatus = e;
1.12 espie 209: errno = save_errno;
210: }
211:
1.20 deraadt 212: /* ARGSUSED */
1.12 espie 213: void
1.19 deraadt 214: handlesigwinch(int signo)
1.12 espie 215: {
1.16 deraadt 216: int save_errno = errno;
1.12 espie 217: struct winsize win;
218: pid_t pgrp;
219:
220: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) {
1.16 deraadt 221: ioctl(slave, TIOCSWINSZ, &win);
222: if (ioctl(slave, TIOCGPGRP, &pgrp) != -1)
223: killpg(pgrp, SIGWINCH);
1.12 espie 224: }
1.8 deraadt 225: errno = save_errno;
1.1 deraadt 226: }
227:
228: void
1.19 deraadt 229: dooutput(void)
1.1 deraadt 230: {
1.16 deraadt 231: struct sigaction sa;
1.1 deraadt 232: struct itimerval value;
1.22 millert 233: sigset_t blkalrm;
1.16 deraadt 234: char obuf[BUFSIZ];
1.1 deraadt 235: time_t tvec;
1.16 deraadt 236: ssize_t outcc = 0, cc, off;
1.1 deraadt 237:
238: (void)close(STDIN_FILENO);
239: tvec = time(NULL);
240: (void)fprintf(fscript, "Script started on %s", ctime(&tvec));
241:
1.22 millert 242: sigemptyset(&blkalrm);
243: sigaddset(&blkalrm, SIGALRM);
1.16 deraadt 244: bzero(&sa, sizeof sa);
245: sigemptyset(&sa.sa_mask);
246: sa.sa_handler = scriptflush;
247: (void)sigaction(SIGALRM, &sa, NULL);
1.27 deraadt 248:
249: bzero(&sa, sizeof sa);
250: sigemptyset(&sa.sa_mask);
251: sa.sa_handler = SIG_IGN;
252: (void)sigaction(SIGCHLD, &sa, NULL);
1.28 deraadt 253:
1.31 ! deraadt 254: if (pledge("stdio", NULL) == -1)
! 255: err(1, "pledge");
1.16 deraadt 256:
1.26 millert 257: value.it_interval.tv_sec = 30;
1.1 deraadt 258: value.it_interval.tv_usec = 0;
259: value.it_value = value.it_interval;
260: (void)setitimer(ITIMER_REAL, &value, NULL);
261: for (;;) {
1.16 deraadt 262: if (flush) {
263: if (outcc) {
264: (void)fflush(fscript);
265: outcc = 0;
266: }
267: flush = 0;
268: }
1.1 deraadt 269: cc = read(master, obuf, sizeof (obuf));
1.16 deraadt 270: if (cc == -1 && errno == EINTR)
271: continue;
1.1 deraadt 272: if (cc <= 0)
273: break;
1.22 millert 274: sigprocmask(SIG_BLOCK, &blkalrm, NULL);
1.16 deraadt 275: for (off = 0; off < cc; ) {
1.23 deraadt 276: ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off);
1.24 deraadt 277: if (n == -1 && errno != EAGAIN)
278: break;
1.16 deraadt 279: if (n == 0)
280: break; /* skip writing */
281: if (n > 0)
282: off += n;
283: }
1.1 deraadt 284: (void)fwrite(obuf, 1, cc, fscript);
285: outcc += cc;
1.22 millert 286: sigprocmask(SIG_UNBLOCK, &blkalrm, NULL);
1.1 deraadt 287: }
1.11 ericj 288: done(0);
1.1 deraadt 289: }
290:
1.20 deraadt 291: /* ARGSUSED */
1.1 deraadt 292: void
1.19 deraadt 293: scriptflush(int signo)
1.1 deraadt 294: {
1.16 deraadt 295: flush = 1;
1.1 deraadt 296: }
297:
298: void
1.19 deraadt 299: doshell(void)
1.1 deraadt 300: {
301: char *shell;
302:
303: shell = getenv("SHELL");
304: if (shell == NULL)
305: shell = _PATH_BSHELL;
306:
307: (void)close(master);
308: (void)fclose(fscript);
309: login_tty(slave);
1.15 deraadt 310: execl(shell, shell, "-i", (char *)NULL);
1.21 mickey 311: warn("%s", shell);
1.1 deraadt 312: fail();
313: }
314:
315: void
1.19 deraadt 316: fail(void)
1.1 deraadt 317: {
318:
319: (void)kill(0, SIGTERM);
1.11 ericj 320: done(1);
1.1 deraadt 321: }
322:
323: void
1.19 deraadt 324: done(int eval)
1.1 deraadt 325: {
326: time_t tvec;
327:
328: if (subchild) {
329: tvec = time(NULL);
330: (void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
331: (void)fclose(fscript);
332: (void)close(master);
333: } else {
334: (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
335: (void)printf("Script done, output file is %s\n", fname);
336: }
1.11 ericj 337: exit(eval);
1.1 deraadt 338: }
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