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Diffstat (limited to 'openbsd-compat/bsd-openpty.c')
| -rw-r--r-- | openbsd-compat/bsd-openpty.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/openbsd-compat/bsd-openpty.c b/openbsd-compat/bsd-openpty.c new file mode 100644 index 0000000..f550700 --- /dev/null +++ b/openbsd-compat/bsd-openpty.c @@ -0,0 +1,240 @@ +/* + * Please note: this implementation of openpty() is far from complete. + * it is just enough for portable OpenSSH's needs. + */ + +/* + * Copyright (c) 2004 Damien Miller <djm@mindrot.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * 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" +#if !defined(HAVE_OPENPTY) + +#include <sys/types.h> + +#include <stdlib.h> + +#ifdef HAVE_SYS_STAT_H +# include <sys/stat.h> +#endif +#ifdef HAVE_SYS_IOCTL_H +# include <sys/ioctl.h> +#endif + +#ifdef HAVE_FCNTL_H +# include <fcntl.h> +#endif + +#ifdef HAVE_UTIL_H +# include <util.h> +#endif /* HAVE_UTIL_H */ + +#ifdef HAVE_PTY_H +# include <pty.h> +#endif +#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) +# include <sys/stropts.h> +#endif + +#include <signal.h> +#include <string.h> +#include <unistd.h> + +#include "misc.h" +#include "log.h" + +#ifndef O_NOCTTY +#define O_NOCTTY 0 +#endif + +#if defined(HAVE_DEV_PTMX) && !defined(HAVE__GETPTY) +static int +openpty_streams(int *amaster, int *aslave) +{ + /* + * 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; + sshsig_t old_signal; + + if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1) + return (-1); + + /* XXX: need to close ptm on error? */ + old_signal = ssh_signal(SIGCHLD, SIG_DFL); + if (grantpt(ptm) < 0) + return (-1); + ssh_signal(SIGCHLD, old_signal); + + if (unlockpt(ptm) < 0) + return (-1); + + if ((pts = ptsname(ptm)) == NULL) + return (-1); + *amaster = ptm; + + /* Open the slave side. */ + if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) { + close(*amaster); + return (-1); + } + +# if defined(I_FIND) && defined(__SVR4) + /* + * If the streams modules have already been pushed then there + * is no more work to do here. + */ + if (ioctl(*aslave, I_FIND, "ptem") != 0) + return 0; +# endif + + /* + * Try to push the appropriate streams modules, as described + * in Solaris pts(7). + */ + ioctl(*aslave, I_PUSH, "ptem"); + ioctl(*aslave, I_PUSH, "ldterm"); +# ifndef __hpux + ioctl(*aslave, I_PUSH, "ttcompat"); +# endif /* __hpux */ + return (0); +} +#endif + +int +openpty(int *amaster, int *aslave, char *name, struct termios *termp, + struct winsize *winp) +{ +#if defined(HAVE__GETPTY) + /* + * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more + * pty's automagically when needed + */ + char *slave; + + if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL) + return (-1); + + /* Open the slave side. */ + if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) { + close(*amaster); + return (-1); + } + return (0); + +#elif defined(HAVE_DEV_PTMX) + +#ifdef SSHD_ACQUIRES_CTTY + /* + * On some (most? all?) SysV based systems with STREAMS based terminals, + * sshd will acquire a controlling terminal when it pushes the "ptem" + * module. On such platforms, first allocate a sacrificial pty so + * that sshd already has a controlling terminal before allocating the + * one that will be passed back to the user process. This ensures + * the second pty is not already the controlling terminal for a + * different session and is available to become controlling terminal + * for the client's subprocess. See bugzilla #245 for details. + */ + int r, fd; + static int junk_ptyfd = -1, junk_ttyfd; + + r = openpty_streams(amaster, aslave); + if (junk_ptyfd == -1 && (fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) >= 0) { + close(fd); + junk_ptyfd = *amaster; + junk_ttyfd = *aslave; + debug("STREAMS bug workaround pty %d tty %d name %s", + junk_ptyfd, junk_ttyfd, ttyname(junk_ttyfd)); + } else + return r; +#endif + + return openpty_streams(amaster, aslave); + +#elif defined(HAVE_DEV_PTS_AND_PTC) + /* AIX-style pty code. */ + const char *ttname; + + if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) + return (-1); + if ((ttname = ttyname(*amaster)) == NULL) + return (-1); + if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { + close(*amaster); + return (-1); + } + return (0); + +#else + /* BSD-style pty code. */ + char ptbuf[64], ttbuf[64]; + int i; + const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + 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(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", + ptymajors[i / num_minors], ptyminors[i % num_minors]); + snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", + ptymajors[i / num_minors], ptyminors[i % num_minors]); + + if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { + /* Try SCO style naming */ + snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); + snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); + if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) + continue; + } + + /* Open the slave side. */ + if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { + close(*amaster); + return (-1); + } + /* set tty modes to a sane state for broken clients */ + if (tcgetattr(*amaster, &tio) != -1) { + tio.c_lflag |= (ECHO | ISIG | ICANON); + tio.c_oflag |= (OPOST | ONLCR); + tio.c_iflag |= ICRNL; + tcsetattr(*amaster, TCSANOW, &tio); + } + + return (0); + } + return (-1); +#endif +} + +#endif /* !defined(HAVE_OPENPTY) */ + |