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authorDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
committerDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
commitd4a8b7e34dd619a4debf9a206c81db26d1402ea6 (patch)
treea47d770a2f790f40d18b0982d4e55fa7cfb1fa3b /pty.c
Initial revision
Diffstat (limited to 'pty.c')
-rw-r--r--pty.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/pty.c b/pty.c
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index 00000000..440994b5
--- /dev/null
+++ b/pty.c
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+/*
+
+pty.c
+
+Author: Tatu Ylonen <ylo@cs.hut.fi>
+
+Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ All rights reserved
+
+Created: Fri Mar 17 04:37:25 1995 ylo
+
+Allocating a pseudo-terminal, and making it the controlling tty.
+
+*/
+
+#include "includes.h"
+RCSID("$Id: pty.c,v 1.1 1999/10/27 03:42:44 damien Exp $");
+
+#include "pty.h"
+#include "ssh.h"
+
+/* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
+#if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
+#undef HAVE_DEV_PTMX
+#endif
+
+#ifndef O_NOCTTY
+#define O_NOCTTY 0
+#endif
+
+/* Allocates and opens a pty. Returns 0 if no pty could be allocated,
+ or nonzero if a pty was successfully allocated. On success, open file
+ descriptors for the pty and tty sides and the name of the tty side are
+ returned (the buffer must be able to hold at least 64 characters). */
+
+int pty_allocate(int *ptyfd, int *ttyfd, char *namebuf)
+{
+#ifdef HAVE_OPENPTY
+
+ /* openpty(3) exists in OSF/1 and some other os'es */
+
+ int i;
+
+ i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL);
+
+ if (i < 0)
+ {
+ error("openpty: %.100s", strerror(errno));
+ return 0;
+ }
+
+ return 1;
+
+#else /* HAVE_OPENPTY */
+#ifdef HAVE__GETPTY
+
+ /* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
+ pty's automagically when needed */
+
+ char *slave;
+
+ slave = _getpty(ptyfd, O_RDWR, 0622, 0);
+ if (slave == NULL)
+ {
+ error("_getpty: %.100s", strerror(errno));
+ return 0;
+ }
+ strcpy(namebuf, slave);
+ /* Open the slave side. */
+ *ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
+ if (*ttyfd < 0)
+ {
+ error("%.200s: %.100s", namebuf, strerror(errno));
+ close(*ptyfd);
+ return 0;
+ }
+ return 1;
+
+#else /* HAVE__GETPTY */
+#ifdef HAVE_DEV_PTMX
+ /* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 also has
+ bsd-style ptys, but they simply do not work.) */
+
+ int ptm;
+ char *pts;
+
+ ptm = open("/dev/ptmx", O_RDWR|O_NOCTTY);
+ if (ptm < 0)
+ {
+ error("/dev/ptmx: %.100s", strerror(errno));
+ return 0;
+ }
+ if (grantpt(ptm) < 0)
+ {
+ error("grantpt: %.100s", strerror(errno));
+ return 0;
+ }
+ if (unlockpt(ptm) < 0)
+ {
+ error("unlockpt: %.100s", strerror(errno));
+ return 0;
+ }
+ pts = ptsname(ptm);
+ if (pts == NULL)
+ error("Slave pty side name could not be obtained.");
+ strcpy(namebuf, pts);
+ *ptyfd = ptm;
+
+ /* Open the slave side. */
+ *ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
+ if (*ttyfd < 0)
+ {
+ error("%.100s: %.100s", namebuf, strerror(errno));
+ close(*ptyfd);
+ return 0;
+ }
+ /* Push the appropriate streams modules, as described in Solaris pts(7). */
+ if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
+ error("ioctl I_PUSH ptem: %.100s", strerror(errno));
+ if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
+ error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
+ if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
+ error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
+ return 1;
+
+#else /* HAVE_DEV_PTMX */
+#ifdef HAVE_DEV_PTS_AND_PTC
+
+ /* AIX-style pty code. */
+
+ const char *name;
+
+ *ptyfd = open("/dev/ptc", O_RDWR|O_NOCTTY);
+ if (*ptyfd < 0)
+ {
+ error("Could not open /dev/ptc: %.100s", strerror(errno));
+ return 0;
+ }
+ name = ttyname(*ptyfd);
+ if (!name)
+ fatal("Open of /dev/ptc returns device for which ttyname fails.");
+ strcpy(namebuf, name);
+ *ttyfd = open(name, O_RDWR|O_NOCTTY);
+ if (*ttyfd < 0)
+ {
+ error("Could not open pty slave side %.100s: %.100s",
+ name, strerror(errno));
+ close(*ptyfd);
+ return 0;
+ }
+ return 1;
+
+#else /* HAVE_DEV_PTS_AND_PTC */
+ /* BSD-style pty code. */
+
+ char buf[64];
+ int i;
+ const char *ptymajors =
+ "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ const char *ptyminors = "0123456789abcdef";
+ int num_minors = strlen(ptyminors);
+ int num_ptys = strlen(ptymajors) * num_minors;
+
+ for (i = 0; i < num_ptys; i++)
+ {
+ snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
+ ptyminors[i % num_minors]);
+ *ptyfd = open(buf, O_RDWR|O_NOCTTY);
+ if (*ptyfd < 0)
+ continue;
+ snprintf(namebuf, sizeof buf, "/dev/tty%c%c", ptymajors[i / num_minors],
+ ptyminors[i % num_minors]);
+
+ /* Open the slave side. */
+ *ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
+ if (*ttyfd < 0)
+ {
+ error("%.100s: %.100s", namebuf, strerror(errno));
+ close(*ptyfd);
+ return 0;
+ }
+ return 1;
+ }
+ return 0;
+#endif /* HAVE_DEV_PTS_AND_PTC */
+#endif /* HAVE_DEV_PTMX */
+#endif /* HAVE__GETPTY */
+#endif /* HAVE_OPENPTY */
+}
+
+/* Releases the tty. Its ownership is returned to root, and permissions to
+ 0666. */
+
+void pty_release(const char *ttyname)
+{
+ if (chown(ttyname, (uid_t)0, (gid_t)0) < 0)
+ debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
+ if (chmod(ttyname, (mode_t)0666) < 0)
+ debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
+}
+
+/* Makes the tty the processes controlling tty and sets it to sane modes. */
+
+void pty_make_controlling_tty(int *ttyfd, const char *ttyname)
+{
+ int fd;
+
+ /* First disconnect from the old controlling tty. */
+#ifdef TIOCNOTTY
+ fd = open("/dev/tty", O_RDWR|O_NOCTTY);
+ if (fd >= 0)
+ {
+ (void)ioctl(fd, TIOCNOTTY, NULL);
+ close(fd);
+ }
+#endif /* TIOCNOTTY */
+ if (setsid() < 0)
+ error("setsid: %.100s", strerror(errno));
+
+ /* Verify that we are successfully disconnected from the controlling tty. */
+ fd = open("/dev/tty", O_RDWR|O_NOCTTY);
+ if (fd >= 0)
+ {
+ error("Failed to disconnect from controlling tty.");
+ close(fd);
+ }
+
+ /* Make it our controlling tty. */
+#ifdef TIOCSCTTY
+ debug("Setting controlling tty using TIOCSCTTY.");
+ /* We ignore errors from this, because HPSUX defines TIOCSCTTY, but returns
+ EINVAL with these arguments, and there is absolutely no documentation. */
+ ioctl(*ttyfd, TIOCSCTTY, NULL);
+#endif /* TIOCSCTTY */
+ fd = open(ttyname, O_RDWR);
+ if (fd < 0)
+ error("%.100s: %.100s", ttyname, strerror(errno));
+ else
+ close(fd);
+
+ /* Verify that we now have a controlling tty. */
+ fd = open("/dev/tty", O_WRONLY);
+ if (fd < 0)
+ error("open /dev/tty failed - could not set controlling tty: %.100s",
+ strerror(errno));
+ else
+ {
+ close(fd);
+ }
+}
+
+/* Changes the window size associated with the pty. */
+
+void pty_change_window_size(int ptyfd, int row, int col,
+ int xpixel, int ypixel)
+{
+ struct winsize w;
+ w.ws_row = row;
+ w.ws_col = col;
+ w.ws_xpixel = xpixel;
+ w.ws_ypixel = ypixel;
+ (void)ioctl(ptyfd, TIOCSWINSZ, &w);
+}
+