#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
#include <err.h>
FILE *fscript;
int master, slave;
volatile sig_atomic_t child;
pid_t subchild;
char *fname;
volatile sig_atomic_t dead;
volatile sig_atomic_t sigdeadstatus;
volatile sig_atomic_t flush;
struct termios tt;
int istty;
__dead void done(int);
void dooutput(void);
void doshell(char *);
void fail(void);
void finish(int);
void scriptflush(int);
void handlesigwinch(int);
int
main(int argc, char *argv[])
{
extern char *__progname;
struct sigaction sa;
struct winsize win;
char ibuf[BUFSIZ];
char *cmd;
ssize_t cc, off;
int aflg, ch;
cmd = NULL;
aflg = 0;
while ((ch = getopt(argc, argv, "ac:")) != -1)
switch(ch) {
case 'a':
aflg = 1;
break;
case 'c':
cmd = optarg;
break;
default:
fprintf(stderr, "usage: %s [-a] [-c command] [file]\n",
__progname);
exit(1);
}
argc -= optind;
argv += optind;
if (argc > 0)
fname = argv[0];
else
fname = "typescript";
if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
err(1, "%s", fname);
if (isatty(0)) {
if (tcgetattr(STDIN_FILENO, &tt) == 0 &&
ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == 0)
istty = 1;
}
if (openpty(&master, &slave, NULL, &tt, &win) == -1)
err(1, "openpty");
(void)printf("Script started, output file is %s\n", fname);
if (istty) {
struct termios rtt = tt;
cfmakeraw(&rtt);
rtt.c_lflag &= ~ECHO;
(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
}
bzero(&sa, sizeof sa);
sigemptyset(&sa.sa_mask);
sa.sa_handler = handlesigwinch;
sa.sa_flags = SA_RESTART;
(void)sigaction(SIGWINCH, &sa, NULL);
child = fork();
if (child == -1) {
warn("fork");
fail();
}
if (child == 0) {
subchild = child = fork();
if (child == -1) {
warn("fork");
fail();
}
if (child)
dooutput();
else
doshell(cmd);
}
bzero(&sa, sizeof sa);
sigemptyset(&sa.sa_mask);
sa.sa_handler = finish;
(void)sigaction(SIGCHLD, &sa, NULL);
if (pledge("stdio proc tty", NULL) == -1)
err(1, "pledge");
(void)fclose(fscript);
while (1) {
if (dead)
break;
cc = read(STDIN_FILENO, ibuf, BUFSIZ);
if (cc == -1 && errno == EINTR)
continue;
if (cc <= 0)
break;
for (off = 0; off < cc; ) {
ssize_t n = write(master, ibuf + off, cc - off);
if (n == -1 && errno != EAGAIN)
break;
if (n == 0)
break;
if (n > 0)
off += n;
}
}
done(sigdeadstatus);
}
void
finish(int signo)
{
int save_errno = errno;
int status, e = 1;
pid_t pid;
while ((pid = wait3(&status, WNOHANG, 0)) > 0) {
if (pid == (pid_t)child) {
if (WIFEXITED(status))
e = WEXITSTATUS(status);
}
}
dead = 1;
sigdeadstatus = e;
errno = save_errno;
}
void
handlesigwinch(int signo)
{
int save_errno = errno;
struct winsize win;
pid_t pgrp;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) {
ioctl(slave, TIOCSWINSZ, &win);
if (ioctl(slave, TIOCGPGRP, &pgrp) != -1)
killpg(pgrp, SIGWINCH);
}
errno = save_errno;
}
void
dooutput(void)
{
struct sigaction sa;
struct itimerval value;
sigset_t blkalrm;
char obuf[BUFSIZ];
time_t tvec;
ssize_t outcc = 0, cc, off;
(void)close(STDIN_FILENO);
tvec = time(NULL);
(void)fprintf(fscript, "Script started on %s", ctime(&tvec));
sigemptyset(&blkalrm);
sigaddset(&blkalrm, SIGALRM);
bzero(&sa, sizeof sa);
sigemptyset(&sa.sa_mask);
sa.sa_handler = scriptflush;
(void)sigaction(SIGALRM, &sa, NULL);
bzero(&sa, sizeof sa);
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
(void)sigaction(SIGCHLD, &sa, NULL);
if (pledge("stdio proc", NULL) == -1)
err(1, "pledge");
value.it_interval.tv_sec = 30;
value.it_interval.tv_usec = 0;
value.it_value = value.it_interval;
(void)setitimer(ITIMER_REAL, &value, NULL);
for (;;) {
if (flush) {
if (outcc) {
(void)fflush(fscript);
outcc = 0;
}
flush = 0;
}
cc = read(master, obuf, sizeof (obuf));
if (cc == -1 && errno == EINTR)
continue;
if (cc <= 0)
break;
sigprocmask(SIG_BLOCK, &blkalrm, NULL);
for (off = 0; off < cc; ) {
ssize_t n = write(STDOUT_FILENO, obuf + off, cc - off);
if (n == -1 && errno != EAGAIN)
break;
if (n == 0)
break;
if (n > 0)
off += n;
}
(void)fwrite(obuf, 1, cc, fscript);
outcc += cc;
sigprocmask(SIG_UNBLOCK, &blkalrm, NULL);
}
done(0);
}
void
scriptflush(int signo)
{
flush = 1;
}
void
doshell(char *cmd)
{
char *shell;
char *argp[] = {"sh", "-c", NULL, NULL};
shell = getenv("SHELL");
if (shell == NULL)
shell = _PATH_BSHELL;
(void)close(master);
(void)fclose(fscript);
login_tty(slave);
if (cmd != NULL) {
argp[2] = cmd;
execv(_PATH_BSHELL, argp);
warn("unable to execute %s", _PATH_BSHELL);
} else {
execl(shell, shell, "-i", (char *)NULL);
warn("%s", shell);
}
fail();
}
void
fail(void)
{
(void)kill(0, SIGTERM);
done(1);
}
void
done(int eval)
{
time_t tvec;
if (subchild) {
tvec = time(NULL);
(void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
(void)fclose(fscript);
(void)close(master);
} else {
if (istty)
(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
(void)printf("Script done, output file is %s\n", fname);
}
exit(eval);
}
