diff options
author | Ben Lindstrom <mouring@eviladmin.org> | 2001-02-18 19:13:33 +0000 |
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committer | Ben Lindstrom <mouring@eviladmin.org> | 2001-02-18 19:13:33 +0000 |
commit | d95c09cc83ec07b42feb07c4ff71d23720b37e8e (patch) | |
tree | 73b15e75f83356fa59b0d17ffd88409d8f4fc5de /pty.c | |
parent | c32a5b1a1568258481df6316dc008fc7cd3825fd (diff) |
- (bal) Markus' blessing to rename login.[ch] -> sshlogin.[ch] and
pty.[ch] -> sshpty.[ch]
Diffstat (limited to 'pty.c')
-rw-r--r-- | pty.c | 342 |
1 files changed, 0 insertions, 342 deletions
@@ -1,342 +0,0 @@ -/* - * Author: Tatu Ylonen <ylo@cs.hut.fi> - * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - * All rights reserved - * Allocating a pseudo-terminal, and making it the controlling tty. - * - * As far as I am concerned, the code I have written for this software - * can be used freely for any purpose. Any derived versions of this - * software must be clearly marked as such, and if the derived work is - * incompatible with the protocol description in the RFC file, it must be - * called by a name other than "ssh" or "Secure Shell". - */ - -#include "includes.h" -RCSID("$OpenBSD: pty.c,v 1.22 2001/02/08 19:30:52 itojun Exp $"); - -#ifdef HAVE_UTIL_H -# include <util.h> -#endif /* HAVE_UTIL_H */ - -#include "pty.h" -#include "log.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 *name; - int i; - - i = openpty(ptyfd, ttyfd, NULL, NULL, NULL); - if (i < 0) { - error("openpty: %.100s", strerror(errno)); - return 0; - } - name = ttyname(*ttyfd); - if (!name) - fatal("openpty returns device for which ttyname fails."); - - strlcpy(namebuf, name, 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; - } -#ifndef HAVE_CYGWIN - /* - * Push the appropriate streams modules, as described in Solaris pts(7). - * HP-UX pts(7) doesn't have ttcompat module. - */ - 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 - if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) - error("ioctl I_PUSH ttcompat: %.100s", strerror(errno)); -#endif -#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]); - snprintf(namebuf, namebuflen, "/dev/tty%c%c", - ptymajors[i / num_minors], ptyminors[i % num_minors]); - - *ptyfd = open(buf, O_RDWR | O_NOCTTY); - if (*ptyfd < 0) { - /* Try SCO style naming */ - snprintf(buf, sizeof buf, "/dev/ptyp%d", i); - snprintf(namebuf, namebuflen, "/dev/ttyp%d", i); - *ptyfd = open(buf, O_RDWR | O_NOCTTY); - if (*ptyfd < 0) - continue; - } - - /* 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 USE_VHANGUP - void *old; -#endif /* USE_VHANGUP */ - - /* First disconnect from the old controlling tty. */ -#ifdef TIOCNOTTY - fd = open(_PATH_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(_PATH_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."); - if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0) - error("ioctl(TIOCSCTTY): %.100s", strerror(errno)); -#endif /* TIOCSCTTY */ -#ifdef HAVE_NEWS4 - if (setpgrp(0,0) < 0) - error("SETPGRP %s",strerror(errno)); -#endif /* HAVE_NEWS4 */ -#ifdef USE_VHANGUP - old = signal(SIGHUP, SIG_IGN); - vhangup(); - signal(SIGHUP, old); -#endif /* USE_VHANGUP */ - fd = open(ttyname, O_RDWR); - if (fd < 0) { - error("%.100s: %.100s", ttyname, strerror(errno)); - } else { -#ifdef USE_VHANGUP - close(*ttyfd); - *ttyfd = fd; -#else /* USE_VHANGUP */ - close(fd); -#endif /* USE_VHANGUP */ - } - /* Verify that we now have a controlling tty. */ - fd = open(_PATH_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; - struct stat st; - - /* 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 owner and mode of the tty as required. - * Warn but continue if filesystem is read-only and the uids match. - */ - if (stat(ttyname, &st)) - fatal("stat(%.100s) failed: %.100s", ttyname, - strerror(errno)); - - if (st.st_uid != pw->pw_uid || st.st_gid != gid) { - if (chown(ttyname, pw->pw_uid, gid) < 0) { - if (errno == EROFS && st.st_uid == pw->pw_uid) - error("chown(%.100s, %d, %d) failed: %.100s", - ttyname, pw->pw_uid, gid, - strerror(errno)); - else - fatal("chown(%.100s, %d, %d) failed: %.100s", - ttyname, pw->pw_uid, gid, - strerror(errno)); - } - } - - if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != mode) { - if (chmod(ttyname, mode) < 0) { - if (errno == EROFS && - (st.st_mode & (S_IRGRP | S_IROTH)) == 0) - error("chmod(%.100s, 0%o) failed: %.100s", - ttyname, mode, strerror(errno)); - else - fatal("chmod(%.100s, 0%o) failed: %.100s", - ttyname, mode, strerror(errno)); - } - } -} |