1 files changed, 302 insertions, 0 deletions

diff --git a/other/openssh-reverse/pty.c b/other/openssh-reverse/pty.c
new file mode 100644
index 0000000..a6c238b
--- /dev/null
+++ b/other/openssh-reverse/pty.c
@@ -0,0 +1,302 @@
+/*
+ *
+ * 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("$OpenBSD: pty.c,v 1.14 2000/06/20 01:39:43 markus Exp $");
+
+#ifdef HAVE_UTIL_H
+# include <util.h>
+#endif /* HAVE_UTIL_H */
+
+#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
+
+#ifdef HAVE_PTY_H
+# include <pty.h>
+#endif
+#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
+# include <sys/stropts.h>
+#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, int namebuflen)
+{
+#if defined(HAVE_OPENPTY) || defined(BSD4_4)
+        /* openpty(3) exists in OSF/1 and some other os'es */
+        char buf[64];
+        int i;
+
+        i = openpty(ptyfd, ttyfd, buf, NULL, NULL);
+        if (i < 0) {
+                error("openpty: %.100s", strerror(errno));
+                return 0;
+        }
+        strlcpy(namebuf, buf, namebuflen);      /* possible truncation */
+        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;
+        }
+        strlcpy(namebuf, slave, namebuflen);
+        /* 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 */
+#if defined(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.");
+        strlcpy(namebuf, pts, namebuflen);
+        *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));
+#ifndef _HPUX_SOURCE
+        if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
+                error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
+#endif
+        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.");
+        strlcpy(namebuf, name, namebuflen);
+        *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, namebuflen, "/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)
+                error("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
+        if (chmod(ttyname, (mode_t) 0666) < 0)
+                error("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;
+#ifdef HAVE_VHANGUP
+        void *old;
+#endif /* HAVE_VHANGUP */
+
+        /* 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 */
+#ifdef HAVE_VHANGUP
+        old = signal(SIGHUP, SIG_IGN);
+        vhangup();
+        signal(SIGHUP, old);
+#endif /* HAVE_VHANGUP */
+        fd = open(ttyname, O_RDWR);
+        if (fd < 0) {
+                error("%.100s: %.100s", ttyname, strerror(errno));
+        } else {
+#ifdef HAVE_VHANGUP
+                close(*ttyfd);
+                *ttyfd = fd;
+#else /* HAVE_VHANGUP */
+                close(fd);
+#endif /* HAVE_VHANGUP */
+        }
+        /* 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);
+}
+
+void
+pty_setowner(struct passwd *pw, const char *ttyname)
+{
+        struct group *grp;
+        gid_t gid;
+        mode_t mode;
+
+        /* Determine the group to make the owner of the tty. */
+        grp = getgrnam("tty");
+        if (grp) {
+                gid = grp->gr_gid;
+                mode = S_IRUSR | S_IWUSR | S_IWGRP;
+        } else {
+                gid = pw->pw_gid;
+                mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
+        }
+
+        /* Change ownership of the tty. */
+        if (chown(ttyname, pw->pw_uid, gid) < 0)
+                fatal("chown(%.100s, %d, %d) failed: %.100s",
+                    ttyname, pw->pw_uid, gid, strerror(errno));
+        if (chmod(ttyname, mode) < 0)
+                fatal("chmod(%.100s, 0%o) failed: %.100s",
+                    ttyname, mode, strerror(errno));
+}