/*
* Get device node names for the master and slave end of a free pseudo
* terminal. We don't want to replicate the entire openpty(3) logic here, so
* start by letting openpty(3) do the work for us. We make the assumption that
* nobody snatches the pair while we are running.
*/
static void
get_names(char pname[PATH_MAX], char tname[PATH_MAX])
{
int len, masterfd, slavefd;
if (openpty(&masterfd, &slavefd, tname, NULL, NULL) < 0) e(300);
/*
* openpty(3) gives us only the slave name, but we also need the master
* name.
*/
strlcpy(pname, tname, PATH_MAX);
len = strlen(_PATH_DEV);
if (strncmp(pname, _PATH_DEV, len)) e(301);
/* If this fails, this test needs to be updated. */
if (pname[len] != 't') e(302);
pname[len] = 'p';
test_comm(masterfd, slavefd);
if (close(masterfd) < 0) e(303);
if (close(slavefd) < 0) e(304);
}
/*
* Test opening a single side multiple times.
*/
static void
test77b(void)
{
char pname[PATH_MAX], tname[PATH_MAX];
int oldstyle, masterfd, slavefd, extrafd;
subtest = 2;
/* Obtain a pseudo terminal. */
oldstyle = get_pty(&masterfd, pname, tname);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
/*
* It must not be possible to open the master multiple times. Doing so
* is possible only if we have a named master, i.e., an old-style PTY.
*/
test_comm(masterfd, slavefd);
if (oldstyle) {
if ((extrafd = open(pname, O_RDWR | O_NOCTTY)) >= 0) e(0);
if (errno != EIO) e(0);
}
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
/* The slave can be opened multiple times, though. */
oldstyle = get_pty(&masterfd, pname, tname);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
if ((extrafd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, extrafd);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(extrafd) < 0) e(0);
if (close(masterfd) < 0) e(0);
}
/*
* Test opening a single side multiple times.
*/
static void
test77b(void)
{
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd, extrafd;
subtest = 2;
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
/* It must not be possible to open the master multiple times. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(1);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(2);
test_comm(masterfd, slavefd);
if ((extrafd = open(pname, O_RDWR | O_NOCTTY)) >= 0) e(3);
if (errno != EIO) e(4);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(5);
if (close(masterfd) < 0) e(6);
/* The slave can be opened multiple times, though. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(7);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(8);
test_comm(masterfd, slavefd);
if ((extrafd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(9);
test_comm(masterfd, extrafd);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(10);
if (close(extrafd) < 0) e(11);
if (close(masterfd) < 0) e(12);
}
/*
* Obtain a pseudo terminal. The master end is opened and its file descriptor
* stored in 'pfd'. The slave path name is stored in 'tname'. For old-style
* PTYs, the function returns 1 and stores the master name in 'pname' if not
* NULL. For Unix98 PTYs, the function returns 0, in which case no master name
* is available. For old-style PTYs, the caller may close and reopen the
* master. In that case, we make the assumption that nobody snatches the pair
* while we are running. For Unix98 PTYs, the master must be kept open.
*/
static int
get_pty(int *pfd, char pname[PATH_MAX], char tname[PATH_MAX])
{
char *name;
int len, masterfd, slavefd;
/*
* First try Unix98 PTY allocation, mainly to avoid opening the slave
* end immediately. If this fails, try openpty(3) as well.
*/
if ((masterfd = posix_openpt(O_RDWR | O_NOCTTY)) != -1) {
if (grantpt(masterfd) != -1 && unlockpt(masterfd) != -1 &&
(name = ptsname(masterfd)) != NULL) {
*pfd = masterfd;
strlcpy(tname, name, PATH_MAX);
return 0;
}
if (close(masterfd) < 0) e(0);
}
if (openpty(&masterfd, &slavefd, tname, NULL, NULL) < 0) e(0);
test_comm(masterfd, slavefd);
*pfd = masterfd;
if (close(slavefd) < 0) e(0);
/*
* openpty(3) gives us only the slave name, but we also want the master
* name.
*/
len = strlen(_PATH_DEV);
if (strncmp(tname, _PATH_DEV, len)) e(0);
if (strncmp(&tname[len], "tty", 3))
return 0; /* Unix98 after all? Well okay, whatever.. */
if (pname != NULL) {
strlcpy(pname, tname, PATH_MAX);
pname[len] = 'p';
}
return 1;
}
/*
* Test communication on half-open pseudo terminals.
*/
static void
test77c(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
char c;
subtest = 3;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(1);
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(2);
/* Writes to the master should be buffered until there is a slave. */
c = 'E';
if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(3);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(4);
make_raw(slavefd);
if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(5);
if (c != 'E') e(6);
/* Discard the echo on the master. */
if (tcflush(slavefd, TCOFLUSH) != 0) e(7);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(8);
/* Writes to the master after the slave has been closed should fail. */
if (write(masterfd, &c, sizeof(c)) >= 0) e(9);
if (errno != EIO) e(10);
if (close(masterfd) < 0) e(11);
/* Writes to the slave should be buffered until there is a master. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(12);
make_raw(slavefd);
c = 'F';
if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(13);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(14);
if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(15);
if (c != 'F') e(16);
test_comm(masterfd, slavefd);
if (close(masterfd) < 0) e(17);
if (write(slavefd, &c, sizeof(c)) >= 0) e(18);
if (errno != EIO) e(19);
/* Reads from the slave should return EOF if the master is gone. */
if (read(slavefd, &c, sizeof(c)) != 0) e(20);
if (close(slavefd) < 0) e(21);
if (sigaction(SIGHUP, &oact, NULL) < 0) e(22);
}
/*
* Test various orders of opening and closing the master and slave sides of a
* pseudo terminal, as well as opening/closing one side without ever opening
* the other.
*/
static void
test77a(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
subtest = 1;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(1);
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
/* Try opening and then closing the master. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(2);
if (close(masterfd) < 0) e(3);
/* Now see if we can reopen the master as well as the slave. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(4);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(5);
test_comm(masterfd, slavefd);
/* In the meantime, test different closing orders. This is order A. */
if (close(slavefd) < 0) e(6);
if (close(masterfd) < 0) e(7);
/* Now try opening the pair again. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(8);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(9);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(10);
/*
* Try reopening the slave after closing it. It is not very important
* that this works, but the TTY driver should currently support it.
*/
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(11);
test_comm(masterfd, slavefd);
/* This is closing order B. This may or may not cause a SIGHUP. */
if (close(masterfd) < 0) e(12);
if (close(slavefd) < 0) e(13);
/* Try the normal open procedure. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(14);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(15);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(16);
if (close(masterfd) < 0) e(17);
/* Try reopening and closing the slave, without opening the master. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(18);
if (close(slavefd) < 0) e(19);
/* Again, try the normal open procedure. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(20);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(21);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(22);
if (close(masterfd) < 0) e(23);
/* Finally, try opening the slave first. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(24);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(25);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(26);
if (close(masterfd) < 0) e(27);
if (sigaction(SIGHUP, &oact, NULL) < 0) e(28);
}
/*
* Test for Unix98 PTY support and PTYFS.
*/
static void
test77g(void)
{
char *tname;
struct stat buf;
size_t len;
int i, masterfd, slavefd, fd[3], array[3], present[3];
subtest = 7;
/*
* Test basic operation, and verify that the slave node disappears
* after both sides of the pseudo terminal have been closed. We check
* different combinations of open master and slave ends (with 'i'):
* 0) opening and closing the master only, 1) closing a slave before
* the master, and 2) closing the slave after the master.
*/
for (i = 0; i <= 2; i++) {
masterfd = get_unix98_pty(&tname);
if (access(tname, R_OK | W_OK) < 0) e(0);
if (i > 0) {
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0)
e(0);
if (access(tname, R_OK | W_OK) < 0) e(0);
if (i > 1) {
if (close(masterfd) < 0) e(0);
masterfd = slavefd; /* ugly but saving code */
} else if (close(slavefd) < 0) e(0);
}
if (access(tname, R_OK | W_OK) < 0) e(0);
if (close(masterfd) < 0) e(0);
if (access(tname, R_OK | W_OK) == 0) e(0);
}
/*
* Test whether we can open multiple pseudo terminals. We need to be
* able to open three PTYs. Verify that they are properly listed in
* the /dev/pts directory contents, and have proper attributes set.
*/
test_getdents(0, NULL, NULL);
for (i = 0; i < 3; i++) {
fd[i] = get_unix98_pty(&tname);
/* Figure out the slave index number. */
len = strlen(_PATH_DEV_PTS);
if (strncmp(tname, _PATH_DEV_PTS, strlen(_PATH_DEV_PTS))) e(0);
array[i] = atoi(&tname[len]);
present[i] = 1;
}
test_getdents(3, array, present);
if (close(fd[0]) < 0) e(0);
present[0] = 0;
test_getdents(3, array, present);
if (close(fd[2]) < 0) e(0);
present[2] = 0;
test_getdents(3, array, present);
if (close(fd[1]) < 0) e(0);
present[1] = 0;
test_getdents(3, array, present);
/*
* Test chmod(2) on a slave node, and multiple calls to grantpt(3).
* The first grantpt(3) call should create the slave node (we currently
* can not test this: the slave node may be created earlier as well,
* but we do not know its name), whereas subsequent grantpt(3) calls
* should reset its mode, uid, and gid. Testing the latter two and
* chown(2) on the slave node requires root, so we skip that part.
*
* Finally, NetBSD revokes access to existing slave file descriptors
* upon a call to grantpt(3). This is not a POSIX requirement, but
* NetBSD needs this for security reasons because it already creates
* the slave node when the master is opened (and it does not lock the
* slave until a call to unlockpt(3)). MINIX3 does not implement
* revocation this way, because the slave node is created only upon the
* call to grantpt(3), thus leaving no insecure window for the slave
* side between posix_openpt(3) and grantpt(3). While this behavior
* may be changed later, we test for the lack of revocation here now.
*/
masterfd = get_unix98_pty(&tname);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
if (stat(tname, &buf) != 0) e(0);
if (buf.st_mode != (S_IFCHR | 0620)) e(0);
if (chmod(tname, S_IFCHR | 0630) != 0) e(0);
if (stat(tname, &buf) != 0) e(0);
if (buf.st_mode != (S_IFCHR | 0630)) e(0);
if (grantpt(masterfd) != 0) e(0);
if (stat(tname, &buf) != 0) e(0);
if (buf.st_mode != (S_IFCHR | 0620)) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
test_getdents(0, NULL, NULL);
}
/*
* Test communication on half-open pseudo terminals.
*/
static void
test77c(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int oldstyle, masterfd, slavefd;
char c;
subtest = 3;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(0);
/* Obtain a pseudo terminal. */
oldstyle = get_pty(&masterfd, pname, tname);
/*
* For old-style pseudo terminals, we have just opened and closed the
* slave end, which alters the behavior we are testing below. Close
* and reopen the master to start fresh.
*/
if (oldstyle) {
if (close(masterfd) < 0) e(0);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
}
/* Writes to the master should be buffered until there is a slave. */
c = 'E';
if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
make_raw(slavefd);
if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
if (c != 'E') e(0);
/* Discard the echo on the master. */
if (tcflush(slavefd, TCOFLUSH) != 0) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
/* Writes to the master after the slave has been closed should fail. */
if (write(masterfd, &c, sizeof(c)) >= 0) e(0);
if (errno != EIO) e(0);
if (oldstyle)
if (close(masterfd) < 0) e(0);
/*
* Writes to the slave should be buffered until there is a master.
* This applies to old-style PTYs only.
*/
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
if (oldstyle) {
make_raw(slavefd);
c = 'F';
if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
if (c != 'F') e(0);
}
test_comm(masterfd, slavefd);
if (close(masterfd) < 0) e(0);
if (write(slavefd, &c, sizeof(c)) >= 0) e(0);
if (errno != EIO) e(0);
/* Reads from the slave should return EOF if the master is gone. */
if (read(slavefd, &c, sizeof(c)) != 0) e(0);
if (close(slavefd) < 0) e(0);
if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}
/*
* Test various orders of opening and closing the master and slave sides of a
* pseudo terminal, as well as opening/closing one side without ever opening
* the other. This test is meaningful mainly for old-style pseudoterminals.
*/
static void
test77a(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int oldstyle, masterfd, slavefd;
subtest = 1;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(0);
/* Obtain a pseudo terminal. */
oldstyle = get_pty(&masterfd, pname, tname);
if (oldstyle) {
/* Try closing the master. */
if (close(masterfd) < 0) e(0);
/* See if we can reopen the master. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
}
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
/* In the meantime, test different closing orders. This is order A. */
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
/* Now try opening the pair (or a new pair) again. */
if (!oldstyle)
oldstyle = get_pty(&masterfd, pname, tname);
else if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
/*
* Try reopening the slave after closing it. It is not very important
* that this works, but the TTY driver should currently support it.
*/
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
/* This is closing order B. This may or may not cause a SIGHUP. */
if (close(masterfd) < 0) e(0);
if (close(slavefd) < 0) e(0);
/* Try the normal open procedure. */
if (!oldstyle)
oldstyle = get_pty(&masterfd, pname, tname);
else if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
/*
* Try reopening and closing the slave, without opening the master.
* This should work on old-style PTYS, but not on Unix98 PTYs.
*/
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) >= 0) {
if (!oldstyle) e(0);
if (close(slavefd) < 0) e(0);
} else if (oldstyle) e(0);
/* Again, try the normal open procedure. */
if (!oldstyle)
oldstyle = get_pty(&masterfd, pname, tname);
else if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
/*
* Finally, try opening the slave first. This does not work with
* Unix98 PTYs.
*/
if (oldstyle) {
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(0);
if (close(masterfd) < 0) e(0);
}
if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}
