int
uart_set_backend(struct uart_softc *sc, const char *opts)
{
int retval;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
cap_ioctl_t cmds[] = { TIOCGETA, TIOCSETA, TIOCGWINSZ };
#endif
retval = -1;
if (opts == NULL)
return (0);
if (strcmp("stdio", opts) == 0) {
if (!uart_stdio) {
sc->tty.fd = STDIN_FILENO;
sc->tty.opened = true;
uart_stdio = true;
retval = 0;
}
} else if (uart_tty_backend(sc, opts) == 0) {
retval = 0;
}
/* Make the backend file descriptor non-blocking */
if (retval == 0)
retval = fcntl(sc->tty.fd, F_SETFL, O_NONBLOCK);
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ, CAP_WRITE);
if (cap_rights_limit(sc->tty.fd, &rights) == -1 && errno != ENOSYS)
errx(EX_OSERR, "Unable to apply rights for sandbox");
if (cap_ioctls_limit(sc->tty.fd, cmds, nitems(cmds)) == -1 && errno != ENOSYS)
errx(EX_OSERR, "Unable to apply rights for sandbox");
if (!uart_stdio) {
if (caph_limit_stdin() == -1 && errno != ENOSYS)
errx(EX_OSERR, "Unable to apply rights for sandbox");
}
#endif
if (retval == 0)
uart_opentty(sc);
return (retval);
}
int
main(int argc, char *argv[])
{
LIST *p;
int n, fd, rval, wval;
char *bp;
int append, ch, exitval;
char *buf;
#define BSIZE (8 * 1024)
append = 0;
while ((ch = getopt(argc, argv, "ai")) != -1)
switch((char)ch) {
case 'a':
append = 1;
break;
case 'i':
(void)signal(SIGINT, SIG_IGN);
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;
if ((buf = malloc(BSIZE)) == NULL)
err(1, "malloc");
if (caph_limit_stdin() == -1 || caph_limit_stderr() == -1)
err(EXIT_FAILURE, "unable to limit stdio");
add(STDOUT_FILENO, "stdout");
for (exitval = 0; *argv; ++argv)
if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
warn("%s", *argv);
exitval = 1;
} else
add(fd, *argv);
if (caph_enter() < 0)
err(EXIT_FAILURE, "unable to enter capability mode");
while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
for (p = head; p; p = p->next) {
n = rval;
bp = buf;
do {
if ((wval = write(p->fd, bp, n)) == -1) {
warn("%s", p->name);
exitval = 1;
break;
}
bp += wval;
} while (n -= wval);
}
if (rval < 0)
err(1, "read");
exit(exitval);
}