Annotation of src/usr.bin/script/script.c, Revision 1.25
1.25 ! deraadt 1: /* $OpenBSD: script.c,v 1.24 2005/12/12 20:10:53 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 <tzfile.h>
73: #include <unistd.h>
74:
1.5 deraadt 75: #include <util.h>
1.7 mickey 76: #include <err.h>
1.5 deraadt 77:
1.1 deraadt 78: FILE *fscript;
79: int master, slave;
1.20 deraadt 80: volatile sig_atomic_t child;
81: pid_t subchild;
1.1 deraadt 82: char *fname;
83:
1.16 deraadt 84: volatile sig_atomic_t dead;
85: volatile sig_atomic_t sigdeadstatus;
86: volatile sig_atomic_t flush;
87:
1.1 deraadt 88: struct termios tt;
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 termios rtt;
104: struct winsize win;
1.16 deraadt 105: char ibuf[BUFSIZ];
106: ssize_t cc, off;
1.1 deraadt 107: int aflg, ch;
108:
109: aflg = 0;
1.3 millert 110: while ((ch = getopt(argc, argv, "a")) != -1)
1.1 deraadt 111: switch(ch) {
112: case 'a':
113: aflg = 1;
114: break;
115: default:
1.21 mickey 116: fprintf(stderr, "usage: %s [-a] [file]\n", __progname);
1.1 deraadt 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)
1.13 millert 128: err(1, "%s", fname);
1.1 deraadt 129:
130: (void)tcgetattr(STDIN_FILENO, &tt);
131: (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
132: if (openpty(&master, &slave, NULL, &tt, &win) == -1)
1.7 mickey 133: err(1, "openpty");
1.1 deraadt 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:
1.16 deraadt 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:
1.1 deraadt 150: child = fork();
151: if (child < 0) {
1.21 mickey 152: warn("fork");
1.1 deraadt 153: fail();
154: }
155: if (child == 0) {
156: subchild = child = fork();
157: if (child < 0) {
1.21 mickey 158: warn("fork");
1.1 deraadt 159: fail();
160: }
161: if (child)
162: dooutput();
163: else
164: doshell();
165: }
166:
167: (void)fclose(fscript);
1.16 deraadt 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);
1.24 deraadt 178: if (n == -1 && errno != EAGAIN)
179: break;
1.16 deraadt 180: if (n == 0)
181: break; /* skip writing */
182: if (n > 0)
183: off += n;
184: }
185: }
186: done(sigdeadstatus);
1.1 deraadt 187: }
188:
1.20 deraadt 189: /* ARGSUSED */
1.1 deraadt 190: void
1.19 deraadt 191: finish(int signo)
1.1 deraadt 192: {
1.8 deraadt 193: int save_errno = errno;
1.16 deraadt 194: int status, e = 1;
195: pid_t pid;
1.1 deraadt 196:
1.16 deraadt 197: while ((pid = wait3(&status, WNOHANG, 0)) > 0) {
1.20 deraadt 198: if (pid == (pid_t)child) {
1.11 ericj 199: if (WIFEXITED(status))
1.16 deraadt 200: e = WEXITSTATUS(status);
1.11 ericj 201: }
1.16 deraadt 202: }
203: dead = 1;
204: sigdeadstatus = e;
1.12 espie 205: errno = save_errno;
206: }
207:
1.20 deraadt 208: /* ARGSUSED */
1.12 espie 209: void
1.19 deraadt 210: handlesigwinch(int signo)
1.12 espie 211: {
1.16 deraadt 212: int save_errno = errno;
1.12 espie 213: struct winsize win;
214: pid_t pgrp;
215:
216: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) {
1.16 deraadt 217: ioctl(slave, TIOCSWINSZ, &win);
218: if (ioctl(slave, TIOCGPGRP, &pgrp) != -1)
219: killpg(pgrp, SIGWINCH);
1.12 espie 220: }
1.8 deraadt 221: errno = save_errno;
1.1 deraadt 222: }
223:
224: void
1.19 deraadt 225: dooutput(void)
1.1 deraadt 226: {
1.16 deraadt 227: struct sigaction sa;
1.1 deraadt 228: struct itimerval value;
1.22 millert 229: sigset_t blkalrm;
1.16 deraadt 230: char obuf[BUFSIZ];
1.1 deraadt 231: time_t tvec;
1.16 deraadt 232: ssize_t outcc = 0, cc, off;
1.1 deraadt 233:
234: (void)close(STDIN_FILENO);
235: tvec = time(NULL);
236: (void)fprintf(fscript, "Script started on %s", ctime(&tvec));
237:
1.22 millert 238: sigemptyset(&blkalrm);
239: sigaddset(&blkalrm, SIGALRM);
1.16 deraadt 240: bzero(&sa, sizeof sa);
241: sigemptyset(&sa.sa_mask);
242: sa.sa_handler = scriptflush;
243: (void)sigaction(SIGALRM, &sa, NULL);
244:
1.1 deraadt 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 (;;) {
1.16 deraadt 250: if (flush) {
251: if (outcc) {
252: (void)fflush(fscript);
253: outcc = 0;
254: }
255: flush = 0;
256: }
1.1 deraadt 257: cc = read(master, obuf, sizeof (obuf));
1.16 deraadt 258: if (cc == -1 && errno == EINTR)
259: continue;
1.1 deraadt 260: if (cc <= 0)
261: break;
1.22 millert 262: sigprocmask(SIG_BLOCK, &blkalrm, NULL);
1.16 deraadt 263: for (off = 0; off < cc; ) {
1.23 deraadt 264: ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off);
1.24 deraadt 265: if (n == -1 && errno != EAGAIN)
266: break;
1.16 deraadt 267: if (n == 0)
268: break; /* skip writing */
269: if (n > 0)
270: off += n;
271: }
1.1 deraadt 272: (void)fwrite(obuf, 1, cc, fscript);
273: outcc += cc;
1.22 millert 274: sigprocmask(SIG_UNBLOCK, &blkalrm, NULL);
1.1 deraadt 275: }
1.11 ericj 276: done(0);
1.1 deraadt 277: }
278:
1.20 deraadt 279: /* ARGSUSED */
1.1 deraadt 280: void
1.19 deraadt 281: scriptflush(int signo)
1.1 deraadt 282: {
1.16 deraadt 283: flush = 1;
1.1 deraadt 284: }
285:
286: void
1.19 deraadt 287: doshell(void)
1.1 deraadt 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);
1.15 deraadt 298: execl(shell, shell, "-i", (char *)NULL);
1.21 mickey 299: warn("%s", shell);
1.1 deraadt 300: fail();
301: }
302:
303: void
1.19 deraadt 304: fail(void)
1.1 deraadt 305: {
306:
307: (void)kill(0, SIGTERM);
1.11 ericj 308: done(1);
1.1 deraadt 309: }
310:
311: void
1.19 deraadt 312: done(int eval)
1.1 deraadt 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: }
1.11 ericj 325: exit(eval);
1.1 deraadt 326: }
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