src/Unix/sshpty.c

/*
 * 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".
 */

#if 0 /* not in BasiliskII */
#include "includes.h"
RCSID("$OpenBSD: sshpty.c,v 1.4 2001/12/19 07:18:56 deraadt Exp $");
#else /* not in BasiliskII */
/* Selections from openssh's "includes.h" */
#include "config.h"

#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h> /* For O_NONBLOCK */
#include <stdlib.h>
#include <string.h>
#include <pwd.h>

#include <unistd.h> /* For STDIN_FILENO, etc */
#include <termios.h> /* Struct winsize */

/*
 *-*-nto-qnx needs these headers for strcasecmp and LASTLOG_FILE respectively
 */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_LOGIN_H
# include <login.h>
#endif

#include <sys/ioctl.h>

#ifdef HAVE_SYS_BSDTTY_H
# include <sys/bsdtty.h>
#endif

#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h> /* For S_* constants and macros */
#endif

#ifndef _PATH_TTY
# define _PATH_TTY "/dev/tty"
#endif

#include "strlcpy.h"

#define debug(x) ;

#endif /* not in BasiliskII */

#ifdef HAVE_UTIL_H
# include <util.h>
#endif /* HAVE_UTIL_H */

#include "sshpty.h"
#if 0 /* not in BasiliskII */
#include "log.h"
#include "misc.h"
#else /* stubs for BasiliskII */
#define log printf
#define error printf
#define fatal(x) do { printf("Fatal error: %s", x); return 0; } while(0)
#endif /* not in BasiliskII */

#define mysig_t sig_t
#define mysignal signal
#include <signal.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
#if defined(HAVE_DEV_PTMX) && defined(HAVE_STROPTS_H)
# include <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;
        mysig_t old_signal;

        ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY);
        if (ptm < 0) {
                error("/dev/ptmx: %.100s", strerror(errno));
                return 0;
        }
        old_signal = mysignal(SIGCHLD, SIG_DFL);
        if (grantpt(ptm) < 0) {
                error("grantpt: %.100s", strerror(errno));
                return 0;
        }
        mysignal(SIGCHLD, old_signal);
        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 */
#ifdef _CRAY
        char buf[64];
        int i;
        int highpty;

#ifdef _SC_CRAY_NPTY
        highpty = sysconf(_SC_CRAY_NPTY);
        if (highpty == -1)
                highpty = 128;
#else
        highpty = 128;
#endif

        for (i = 0; i < highpty; i++) {
                snprintf(buf, sizeof(buf), "/dev/pty/%03d", i);
                *ptyfd = open(buf, O_RDWR|O_NOCTTY);
                if (*ptyfd < 0)
                        continue;
                snprintf(namebuf, namebuflen, "/dev/ttyp%03d", i);
                /* 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;
#else
        /* 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;
        struct termios tio;

        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;
                }
                /* set tty modes to a sane state for broken clients */
                if (tcgetattr(*ptyfd, &tio) < 0)
                        log("Getting tty modes for pty failed: %.100s", strerror(errno));
                else {
                        tio.c_lflag |= (ECHO | ISIG | ICANON);
                        tio.c_oflag |= (OPOST | ONLCR);
                        tio.c_iflag |= ICRNL;

                        /* Set the new modes for the terminal. */
                        if (tcsetattr(*ptyfd, TCSANOW, &tio) < 0)
                                log("Setting tty modes for pty failed: %.100s", strerror(errno));
                }

                return 1;
        }
        return 0;
#endif /* CRAY */
#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 */

#ifdef _CRAY
        if (setsid() < 0)
                error("setsid: %.100s", strerror(errno));

        fd = open(ttyname, O_RDWR|O_NOCTTY);
        if (fd != -1) {
                mysignal(SIGHUP, SIG_IGN);
                ioctl(fd, TCVHUP, (char *)NULL);
                mysignal(SIGHUP, SIG_DFL);
                setpgid(0, 0);
                close(fd);
        } else {
                error("Failed to disconnect from controlling tty.");
        }

        debug("Setting controlling tty using TCSETCTTY.");
        ioctl(*ttyfd, TCSETCTTY, NULL);
        fd = open("/dev/tty", O_RDWR);
        if (fd < 0)
                error("%.100s: %.100s", ttyname, strerror(errno));
        close(*ttyfd);
        *ttyfd = fd;
#else /* _CRAY */

        /* 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 = mysignal(SIGHUP, SIG_IGN);
        vhangup();
        mysignal(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);
        }
#endif /* _CRAY */
}

#if 0 /* not in BasiliskII */
/* 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/
         * tty is owned by root.
         */
        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 || st.st_uid == 0))
                                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));
                }
        }
}
#endif /* not in BasiliskII */
Revision:	1.7
Committed:	2012-06-17T23:15:10Z (12 years, 4 months ago) by asvitkine
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.6:	+4 -1 lines
Log Message:	another try to get sshpty.c compiling on bsd
#	User	Rev	Content
1	cebix	1.1	/*
2			* Author: Tatu Ylonen <ylo@cs.hut.fi>
3			* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4			* All rights reserved
5			* Allocating a pseudo-terminal, and making it the controlling tty.
6			*
7			* As far as I am concerned, the code I have written for this software
8			* can be used freely for any purpose. Any derived versions of this
9			* software must be clearly marked as such, and if the derived work is
10			* incompatible with the protocol description in the RFC file, it must be
11			* called by a name other than "ssh" or "Secure Shell".
12			*/
13
14			#if 0 /* not in BasiliskII */
15			#include "includes.h"
16			RCSID("$OpenBSD: sshpty.c,v 1.4 2001/12/19 07:18:56 deraadt Exp $");
17			#else /* not in BasiliskII */
18			/* Selections from openssh's "includes.h" */
19			#include "config.h"
20
21			#include <stdio.h>
22			#include <ctype.h>
23			#include <errno.h>
24			#include <fcntl.h> /* For O_NONBLOCK */
25			#include <stdlib.h>
26			#include <string.h>
27			#include <pwd.h>
28
29			#include <unistd.h> /* For STDIN_FILENO, etc */
30			#include <termios.h> /* Struct winsize */
31
32			/*
33			--nto-qnx needs these headers for strcasecmp and LASTLOG_FILE respectively
34			*/
35			#ifdef HAVE_STRINGS_H
36			# include <strings.h>
37			#endif
38			#ifdef HAVE_LOGIN_H
39			# include <login.h>
40			#endif
41
42			#include <sys/ioctl.h>
43
44			#ifdef HAVE_SYS_BSDTTY_H
45			# include <sys/bsdtty.h>
46			#endif
47
48			#ifdef HAVE_SYS_STAT_H
49			# include <sys/stat.h> /* For S_* constants and macros */
50			#endif
51
52			#ifndef _PATH_TTY
53			# define _PATH_TTY "/dev/tty"
54			#endif
55
56			#include "strlcpy.h"
57
58			#define debug(x) ;
59
60			#endif /* not in BasiliskII */
61
62			#ifdef HAVE_UTIL_H
63			# include <util.h>
64			#endif /* HAVE_UTIL_H */
65
66			#include "sshpty.h"
67			#if 0 /* not in BasiliskII */
68			#include "log.h"
69			#include "misc.h"
70			#else /* stubs for BasiliskII */
71	gbeauche	1.2	#define log printf
72	cebix	1.1	#define error printf
73	asvitkine	1.3	#define fatal(x) do { printf("Fatal error: %s", x); return 0; } while(0)
74	cebix	1.1	#endif /* not in BasiliskII */
75
76	asvitkine	1.4	#define mysig_t sig_t
77	asvitkine	1.5	#define mysignal signal
78	asvitkine	1.4	#include <signal.h>
79
80	cebix	1.1	/* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
81			#if defined(HAVE__GETPTY) \|\| defined(HAVE_OPENPTY)
82			#undef HAVE_DEV_PTMX
83			#endif
84
85			#ifdef HAVE_PTY_H
86			# include <pty.h>
87			#endif
88			#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
89			# include <sys/stropts.h>
90			#endif
91	asvitkine	1.7	#if defined(HAVE_DEV_PTMX) && defined(HAVE_STROPTS_H)
92			# include <stropts.h>
93			#endif
94	cebix	1.1
95			#ifndef O_NOCTTY
96			#define O_NOCTTY 0
97			#endif
98
99			/*
100			* Allocates and opens a pty. Returns 0 if no pty could be allocated, or
101			* nonzero if a pty was successfully allocated. On success, open file
102			* descriptors for the pty and tty sides and the name of the tty side are
103			* returned (the buffer must be able to hold at least 64 characters).
104			*/
105
106			int
107			pty_allocate(int ptyfd, int ttyfd, char *namebuf, int namebuflen)
108			{
109			#if defined(HAVE_OPENPTY) \|\| defined(BSD4_4)
110			/* openpty(3) exists in OSF/1 and some other os'es */
111			char *name;
112			int i;
113
114			i = openpty(ptyfd, ttyfd, NULL, NULL, NULL);
115			if (i < 0) {
116			error("openpty: %.100s", strerror(errno));
117			return 0;
118			}
119			name = ttyname(*ttyfd);
120			if (!name)
121			fatal("openpty returns device for which ttyname fails.");
122
123			strlcpy(namebuf, name, namebuflen); /* possible truncation */
124			return 1;
125			#else /* HAVE_OPENPTY */
126			#ifdef HAVE__GETPTY
127			/*
128			* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
129			* pty's automagically when needed
130			*/
131			char *slave;
132
133			slave = _getpty(ptyfd, O_RDWR, 0622, 0);
134			if (slave == NULL) {
135			error("_getpty: %.100s", strerror(errno));
136			return 0;
137			}
138			strlcpy(namebuf, slave, namebuflen);
139			/* Open the slave side. */
140			*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
141			if (*ttyfd < 0) {
142			error("%.200s: %.100s", namebuf, strerror(errno));
143			close(*ptyfd);
144			return 0;
145			}
146			return 1;
147			#else /* HAVE__GETPTY */
148			#if defined(HAVE_DEV_PTMX)
149			/*
150			* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
151			* also has bsd-style ptys, but they simply do not work.)
152			*/
153			int ptm;
154			char *pts;
155			mysig_t old_signal;
156
157			ptm = open("/dev/ptmx", O_RDWR \| O_NOCTTY);
158			if (ptm < 0) {
159			error("/dev/ptmx: %.100s", strerror(errno));
160			return 0;
161			}
162			old_signal = mysignal(SIGCHLD, SIG_DFL);
163			if (grantpt(ptm) < 0) {
164			error("grantpt: %.100s", strerror(errno));
165			return 0;
166			}
167			mysignal(SIGCHLD, old_signal);
168			if (unlockpt(ptm) < 0) {
169			error("unlockpt: %.100s", strerror(errno));
170			return 0;
171			}
172			pts = ptsname(ptm);
173			if (pts == NULL)
174			error("Slave pty side name could not be obtained.");
175			strlcpy(namebuf, pts, namebuflen);
176			*ptyfd = ptm;
177
178			/* Open the slave side. */
179			*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
180			if (*ttyfd < 0) {
181			error("%.100s: %.100s", namebuf, strerror(errno));
182			close(*ptyfd);
183			return 0;
184			}
185	asvitkine	1.7	#ifndef HAVE_CYGWIN
186	cebix	1.1	/*
187			* Push the appropriate streams modules, as described in Solaris pts(7).
188			* HP-UX pts(7) doesn't have ttcompat module.
189			*/
190			if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
191			error("ioctl I_PUSH ptem: %.100s", strerror(errno));
192			if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
193			error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
194			#ifndef __hpux
195			if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
196			error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
197			#endif
198			#endif
199			return 1;
200			#else /* HAVE_DEV_PTMX */
201			#ifdef HAVE_DEV_PTS_AND_PTC
202			/* AIX-style pty code. */
203			const char *name;
204
205			*ptyfd = open("/dev/ptc", O_RDWR \| O_NOCTTY);
206			if (*ptyfd < 0) {
207			error("Could not open /dev/ptc: %.100s", strerror(errno));
208			return 0;
209			}
210			name = ttyname(*ptyfd);
211			if (!name)
212			fatal("Open of /dev/ptc returns device for which ttyname fails.");
213			strlcpy(namebuf, name, namebuflen);
214			*ttyfd = open(name, O_RDWR \| O_NOCTTY);
215			if (*ttyfd < 0) {
216			error("Could not open pty slave side %.100s: %.100s",
217			name, strerror(errno));
218			close(*ptyfd);
219			return 0;
220			}
221			return 1;
222			#else /* HAVE_DEV_PTS_AND_PTC */
223			#ifdef _CRAY
224			char buf[64];
225			int i;
226			int highpty;
227
228			#ifdef _SC_CRAY_NPTY
229			highpty = sysconf(_SC_CRAY_NPTY);
230			if (highpty == -1)
231			highpty = 128;
232			#else
233			highpty = 128;
234			#endif
235
236			for (i = 0; i < highpty; i++) {
237			snprintf(buf, sizeof(buf), "/dev/pty/%03d", i);
238			*ptyfd = open(buf, O_RDWR\|O_NOCTTY);
239			if (*ptyfd < 0)
240			continue;
241			snprintf(namebuf, namebuflen, "/dev/ttyp%03d", i);
242			/* Open the slave side. */
243			*ttyfd = open(namebuf, O_RDWR\|O_NOCTTY);
244			if (*ttyfd < 0) {
245			error("%.100s: %.100s", namebuf, strerror(errno));
246			close(*ptyfd);
247			return 0;
248			}
249			return 1;
250			}
251			return 0;
252			#else
253			/* BSD-style pty code. */
254			char buf[64];
255			int i;
256			const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
257			const char *ptyminors = "0123456789abcdef";
258			int num_minors = strlen(ptyminors);
259			int num_ptys = strlen(ptymajors) * num_minors;
260			struct termios tio;
261
262			for (i = 0; i < num_ptys; i++) {
263			snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
264			ptyminors[i % num_minors]);
265			snprintf(namebuf, namebuflen, "/dev/tty%c%c",
266			ptymajors[i / num_minors], ptyminors[i % num_minors]);
267
268			*ptyfd = open(buf, O_RDWR \| O_NOCTTY);
269			if (*ptyfd < 0) {
270			/* Try SCO style naming */
271			snprintf(buf, sizeof buf, "/dev/ptyp%d", i);
272			snprintf(namebuf, namebuflen, "/dev/ttyp%d", i);
273			*ptyfd = open(buf, O_RDWR \| O_NOCTTY);
274			if (*ptyfd < 0)
275			continue;
276			}
277
278			/* Open the slave side. */
279			*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
280			if (*ttyfd < 0) {
281			error("%.100s: %.100s", namebuf, strerror(errno));
282			close(*ptyfd);
283			return 0;
284			}
285			/* set tty modes to a sane state for broken clients */
286			if (tcgetattr(*ptyfd, &tio) < 0)
287			log("Getting tty modes for pty failed: %.100s", strerror(errno));
288			else {
289			tio.c_lflag \|= (ECHO \| ISIG \| ICANON);
290			tio.c_oflag \|= (OPOST \| ONLCR);
291			tio.c_iflag \|= ICRNL;
292
293			/* Set the new modes for the terminal. */
294			if (tcsetattr(*ptyfd, TCSANOW, &tio) < 0)
295			log("Setting tty modes for pty failed: %.100s", strerror(errno));
296			}
297
298			return 1;
299			}
300			return 0;
301			#endif /* CRAY */
302			#endif /* HAVE_DEV_PTS_AND_PTC */
303			#endif /* HAVE_DEV_PTMX */
304			#endif /* HAVE__GETPTY */
305			#endif /* HAVE_OPENPTY */
306			}
307
308			/* Releases the tty. Its ownership is returned to root, and permissions to 0666. */
309
310			void
311			pty_release(const char *ttyname)
312			{
313			if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0)
314			error("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
315			if (chmod(ttyname, (mode_t) 0666) < 0)
316			error("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
317			}
318
319			/* Makes the tty the processes controlling tty and sets it to sane modes. */
320
321			void
322			pty_make_controlling_tty(int ttyfd, const char ttyname)
323			{
324			int fd;
325			#ifdef USE_VHANGUP
326			void *old;
327			#endif /* USE_VHANGUP */
328
329			#ifdef _CRAY
330			if (setsid() < 0)
331			error("setsid: %.100s", strerror(errno));
332
333			fd = open(ttyname, O_RDWR\|O_NOCTTY);
334			if (fd != -1) {
335			mysignal(SIGHUP, SIG_IGN);
336			ioctl(fd, TCVHUP, (char *)NULL);
337			mysignal(SIGHUP, SIG_DFL);
338			setpgid(0, 0);
339			close(fd);
340			} else {
341			error("Failed to disconnect from controlling tty.");
342			}
343
344			debug("Setting controlling tty using TCSETCTTY.");
345			ioctl(*ttyfd, TCSETCTTY, NULL);
346			fd = open("/dev/tty", O_RDWR);
347			if (fd < 0)
348			error("%.100s: %.100s", ttyname, strerror(errno));
349			close(*ttyfd);
350			*ttyfd = fd;
351			#else /* _CRAY */
352
353			/* First disconnect from the old controlling tty. */
354			#ifdef TIOCNOTTY
355			fd = open(_PATH_TTY, O_RDWR \| O_NOCTTY);
356			if (fd >= 0) {
357			(void) ioctl(fd, TIOCNOTTY, NULL);
358			close(fd);
359			}
360			#endif /* TIOCNOTTY */
361			if (setsid() < 0)
362			error("setsid: %.100s", strerror(errno));
363
364			/*
365			* Verify that we are successfully disconnected from the controlling
366			* tty.
367			*/
368			fd = open(_PATH_TTY, O_RDWR \| O_NOCTTY);
369			if (fd >= 0) {
370			error("Failed to disconnect from controlling tty.");
371			close(fd);
372			}
373			/* Make it our controlling tty. */
374			#ifdef TIOCSCTTY
375			debug("Setting controlling tty using TIOCSCTTY.");
376			if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0)
377			error("ioctl(TIOCSCTTY): %.100s", strerror(errno));
378			#endif /* TIOCSCTTY */
379			#ifdef HAVE_NEWS4
380			if (setpgrp(0,0) < 0)
381			error("SETPGRP %s",strerror(errno));
382			#endif /* HAVE_NEWS4 */
383			#ifdef USE_VHANGUP
384			old = mysignal(SIGHUP, SIG_IGN);
385			vhangup();
386			mysignal(SIGHUP, old);
387			#endif /* USE_VHANGUP */
388			fd = open(ttyname, O_RDWR);
389			if (fd < 0) {
390			error("%.100s: %.100s", ttyname, strerror(errno));
391			} else {
392			#ifdef USE_VHANGUP
393			close(*ttyfd);
394			*ttyfd = fd;
395			#else /* USE_VHANGUP */
396			close(fd);
397			#endif /* USE_VHANGUP */
398			}
399			/* Verify that we now have a controlling tty. */
400			fd = open(_PATH_TTY, O_WRONLY);
401			if (fd < 0)
402			error("open /dev/tty failed - could not set controlling tty: %.100s",
403			strerror(errno));
404			else {
405			close(fd);
406			}
407			#endif /* _CRAY */
408			}
409
410			#if 0 /* not in BasiliskII */
411			/* Changes the window size associated with the pty. */
412
413			void
414			pty_change_window_size(int ptyfd, int row, int col,
415			int xpixel, int ypixel)
416			{
417			struct winsize w;
418			w.ws_row = row;
419			w.ws_col = col;
420			w.ws_xpixel = xpixel;
421			w.ws_ypixel = ypixel;
422			(void) ioctl(ptyfd, TIOCSWINSZ, &w);
423			}
424
425			void
426			pty_setowner(struct passwd pw, const char ttyname)
427			{
428			struct group *grp;
429			gid_t gid;
430			mode_t mode;
431			struct stat st;
432
433			/* Determine the group to make the owner of the tty. */
434			grp = getgrnam("tty");
435			if (grp) {
436			gid = grp->gr_gid;
437			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
438			} else {
439			gid = pw->pw_gid;
440			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
441			}
442
443			/*
444			* Change owner and mode of the tty as required.
445			* Warn but continue if filesystem is read-only and the uids match/
446			* tty is owned by root.
447			*/
448			if (stat(ttyname, &st))
449			fatal("stat(%.100s) failed: %.100s", ttyname,
450			strerror(errno));
451
452			if (st.st_uid != pw->pw_uid \|\| st.st_gid != gid) {
453			if (chown(ttyname, pw->pw_uid, gid) < 0) {
454			if (errno == EROFS &&
455			(st.st_uid == pw->pw_uid \|\| st.st_uid == 0))
456			error("chown(%.100s, %d, %d) failed: %.100s",
457			ttyname, pw->pw_uid, gid,
458			strerror(errno));
459			else
460			fatal("chown(%.100s, %d, %d) failed: %.100s",
461			ttyname, pw->pw_uid, gid,
462			strerror(errno));
463			}
464			}
465
466			if ((st.st_mode & (S_IRWXU\|S_IRWXG\|S_IRWXO)) != mode) {
467			if (chmod(ttyname, mode) < 0) {
468			if (errno == EROFS &&
469			(st.st_mode & (S_IRGRP \| S_IROTH)) == 0)
470			error("chmod(%.100s, 0%o) failed: %.100s",
471			ttyname, mode, strerror(errno));
472			else
473			fatal("chmod(%.100s, 0%o) failed: %.100s",
474			ttyname, mode, strerror(errno));
475			}
476			}
477			}
478			#endif /* not in BasiliskII */