/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
* 2000-07-30 Per Andreas Buer <per@linpro.no> - added "q"-option
*/
/*
* tcpscript - Modified from 'script' - 2007 Lluis Batlle i Rossell
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef __linux__
#include <unistd.h>
#include <string.h>
#endif
#define HAVE_openpty
#define _PATH_BSHELL "/bin/sh"
#ifdef HAVE_openpty
#include <pty.h>
#endif
void finish(int);
void done(void);
void fail(void);
void resize(int);
void fixtty(void);
void getmaster(void);
void getslave(void);
void doinput(void);
void dooutput(void);
void doshell(void);
char *shell;
int master;
int slave;
int child;
int subchild;
char *fname;
struct termios tt;
struct winsize win;
int lb;
int l;
#ifndef HAVE_openpty
char line[] = "/dev/ptyXX";
#endif
char *cflg = NULL;
int qflg = 0;
int tcp_port = 4000;
int limit_conns = 1;
enum {
MAXCONNS = 10
};
static int accept_socket;
const char version[] = "0.1";
static char *progname;
static void
die_if_link(char *fn) {
struct stat s;
if (lstat(fn, &s) == 0 && (S_ISLNK(s.st_mode) || s.st_nlink > 1)) {
fprintf(stderr,
"Warning: `%s' is a link.\n"
"Use `%s [options] %s' if you really "
"want to use it.\n"
"Script not started.\n",
fn, progname, fn);
exit(1);
}
}
/*
* script -t prints time delays as floating point numbers
* The example program (scriptreplay) that we provide to handle this
* timing output is a perl script, and does not handle numbers in
* locale format (not even when "use locale;" is added).
* So, since these numbers are not for human consumption, it seems
* easiest to set LC_NUMERIC here.
*/
int
main(int argc, char **argv) {
extern int optind;
char *p;
int ch;
progname = argv[0];
if ((p = strrchr(progname, '/')) != NULL)
progname = p+1;
if (argc == 2) {
if (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version")) {
printf("%s %s, modification of 'script' by %s\n",
progname, version,
"Lluis Batlle i Rossell 2007");
return 0;
}
}
while ((ch = getopt(argc, argv, "c:qp:l:")) != -1)
switch((char)ch) {
case 'c':
cflg = optarg;
break;
case 'p':
tcp_port = atoi(optarg);
break;
case 'l':
limit_conns = atoi(optarg);
break;
case 'q':
qflg++;
break;
case '?':
default:
fprintf(stderr,
"usage: script [-l nconns] [-p port] [-q] [-t] \n");
exit(1);
}
argc -= optind;
argv += optind;
shell = getenv("SHELL");
if (shell == NULL)
shell = _PATH_BSHELL;
getmaster();
fixtty();
accept_socket = listen_tcp();
(void) signal(SIGCHLD, finish);
child = fork();
if (child < 0) {
perror("fork");
fail();
}
if (child == 0) {
subchild = child = fork();
if (child < 0) {
perror("fork");
fail();
}
if (child)
dooutput();
else
{
close(accept_socket);
doshell();
}
} else
{
close(accept_socket);
(void) signal(SIGWINCH, resize);
}
doinput();
return 0;
}
void
doinput() {
register int cc;
char ibuf[BUFSIZ];
while ((cc = read(0, ibuf, BUFSIZ)) > 0)
(void) write(master, ibuf, cc);
done();
}
#include <sys/wait.h>
void
finish(int dummy) {
int status;
register int pid;
register int die = 0;
while ((pid = wait3(&status, WNOHANG, 0)) > 0)
if (pid == child)
die = 1;
if (die)
done();
}
void
resize(int dummy) {
/* transmit window change information to the child */
(void) ioctl(0, TIOCGWINSZ, (char *)&win);
(void) ioctl(slave, TIOCSWINSZ, (char *)&win);
kill(child, SIGWINCH);
}
void fatal()
{
done();
exit(-1);
}
int set_reusable(int s)
{
int boolean = 1;
int res;
res = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &boolean, sizeof(boolean));
if (res != 0)
perror("Setsockopt REUSE failed"), fatal();
}
int listen_tcp()
{
int s;
struct sockaddr_in addr;
int res;
s = socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
perror("Failed socket()"), fatal();
set_reusable(s);
addr.sin_family = AF_INET;
addr.sin_port = htons(tcp_port);
addr.sin_addr.s_addr = INADDR_ANY;
res = bind(s, (struct sockaddr *) &addr, sizeof(addr));
if (s != 0)
perror("Failed bind()"), fatal();
res = listen(s, 1);
if (s != 0)
perror("Failed listen()"), fatal();
if (!qflg)
printf("Listening on port %i\n", tcp_port);
return s;
}
void remove_element(int index, int *array, int total)
{
int i;
for (i = index; i < (total - 1); ++i)
array[i] = array[i+1];
}
void
dooutput() {
int cc;
char obuf[BUFSIZ];
int conns[MAXCONNS];
int nconns;
int i;
(void) close(0);
#ifdef HAVE_openpty
(void) close(slave);
#endif
fd_set read_set;
fd_set should_read_set;
fd_set tcp_set;
FD_ZERO(&should_read_set);
FD_SET(accept_socket, &should_read_set);
FD_SET(master, &should_read_set);
nconns = 0;
for (;;) {
int max;
read_set = should_read_set;
/* Calculate max fd */
max = accept_socket;
if (master > max)
max = master;
for (i = 0; i < nconns; ++i)
if (conns[i] > max)
max = conns[i];
select(max + 1, &read_set, 0, 0, 0);
if (FD_ISSET(master, &read_set))
{
cc = read(master, obuf, sizeof (obuf));
if (cc <= 0)
break;
/* Write to the terminal output */
(void) write(1, obuf, cc);
/* Broadcast messages */
for (i = 0; i < nconns; ++i)
(void) write(conns[i], obuf, cc);
}
for (i = 0; i < nconns; ++i)
{
if (FD_ISSET(conns[i], &read_set))
{
int size;
size = read(conns[i], obuf, sizeof(obuf));
if (size == 0)
{
close(conns[i]);
FD_CLR(conns[i], &should_read_set);
remove_element(i, conns, nconns);
nconns--;
}
}
}
if (FD_ISSET(accept_socket, &read_set))
{
int s;
s = accept(accept_socket, 0, 0);
if (s == -1)
{
perror("accept() failed");
break;
}
if (nconns < (MAXCONNS - 1) && nconns < limit_conns)
{
FD_SET(s, &should_read_set);
conns[nconns] = s;
nconns++;
} else
close(s);
}
}
close(accept_socket);
for (i = 0; i < nconns; ++i)
close(conns[i]);
done();
}
void
doshell() {
char *shname;
#if 0
int t;
t = open(_PATH_TTY, O_RDWR);
if (t >= 0) {
(void) ioctl(t, TIOCNOTTY, (char *)0);
(void) close(t);
}
#endif
getslave();
(void) close(master);
(void) dup2(slave, 0);
(void) dup2(slave, 1);
(void) dup2(slave, 2);
(void) close(slave);
shname = strrchr(shell, '/');
if (shname)
shname++;
else
shname = shell;
if (cflg)
execl(shell, shname, "-c", cflg, 0);
else
execl(shell, shname, "-i", 0);
perror(shell);
fail();
}
void
fixtty() {
struct termios rtt;
rtt = tt;
cfmakeraw(&rtt);
rtt.c_lflag &= ~ECHO;
(void) tcsetattr(0, TCSAFLUSH, &rtt);
}
void
fail() {
(void) kill(0, SIGTERM);
done();
}
void
done() {
time_t tvec;
if (subchild) {
(void) close(master);
} else {
(void) tcsetattr(0, TCSAFLUSH, &tt);
}
exit(0);
}
void
getmaster() {
#ifdef HAVE_openpty
(void) tcgetattr(0, &tt);
(void) ioctl(0, TIOCGWINSZ, (char *)&win);
if (openpty(&master, &slave, NULL, &tt, &win) < 0) {
fprintf(stderr, "openpty failed\n");
fail();
}
#else
char *pty, *bank, *cp;
struct stat stb;
pty = &line[strlen("/dev/ptyp")];
for (bank = "pqrs"; *bank; bank++) {
line[strlen("/dev/pty")] = *bank;
*pty = '0';
if (stat(line, &stb) < 0)
break;
for (cp = "0123456789abcdef"; *cp; cp++) {
*pty = *cp;
master = open(line, O_RDWR);
if (master >= 0) {
char *tp = &line[strlen("/dev/")];
int ok;
/* verify slave side is usable */
*tp = 't';
ok = access(line, R_OK|W_OK) == 0;
*tp = 'p';
if (ok) {
(void) tcgetattr(0, &tt);
(void) ioctl(0, TIOCGWINSZ,
(char *)&win);
return;
}
(void) close(master);
}
}
}
fprintf(stderr, "Out of pty's\n");
fail();
#endif /* not HAVE_openpty */
}
void
getslave() {
#ifndef HAVE_openpty
line[strlen("/dev/")] = 't';
slave = open(line, O_RDWR);
if (slave < 0) {
perror(line);
fail();
}
(void) tcsetattr(slave, TCSAFLUSH, &tt);
(void) ioctl(slave, TIOCSWINSZ, (char *)&win);
#endif
(void) setsid();
(void) ioctl(slave, TIOCSCTTY, 0);
}