diff options
Diffstat (limited to 'pty.c')
| -rw-r--r-- | pty.c | 425 |
1 files changed, 425 insertions, 0 deletions
@@ -0,0 +1,425 @@ +/* Copyright (c) 2008, 2009 + * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de) + * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de) + * Micah Cowan (micah@cowan.name) + * Sadrul Habib Chowdhury (sadrul@users.sourceforge.net) + * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007 + * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de) + * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de) + * Copyright (c) 1987 Oliver Laumann + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (see the file COPYING); if not, see + * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA + * + **************************************************************** + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <signal.h> + +#if defined(__OpenBSD__) +#include <utils.h> /* for openpty() */ +#endif + +#include "config.h" +#include "screen.h" + +#ifndef sun +# include <sys/ioctl.h> +#endif + +/* for solaris 2.1, Unixware (SVR4.2) and possibly others */ +#ifdef HAVE_STROPTS_H +# include <sys/stropts.h> +#endif + +#if defined(sun) && defined(LOCKPTY) && !defined(TIOCEXCL) +# include <sys/ttold.h> +#endif + +#ifdef ISC +# include <sys/tty.h> +# include <sys/sioctl.h> +# include <sys/pty.h> +#endif + +#ifdef sgi +# include <sys/sysmacros.h> +#endif /* sgi */ + +#include "extern.h" + +/* + * if no PTYRANGE[01] is in the config file, we pick a default + */ +#ifndef PTYRANGE0 +# define PTYRANGE0 "qpr" +#endif +#ifndef PTYRANGE1 +# define PTYRANGE1 "0123456789abcdef" +#endif + +/* SVR4 pseudo ttys don't seem to work with SCO-5 */ +#ifdef M_UNIX +# undef HAVE_SVR4_PTYS +#endif + +extern int eff_uid; + +/* used for opening a new pty-pair: */ +static char PtyName[32], TtyName[32]; + +#if !(defined(sequent) || defined(_SEQUENT_) || defined(HAVE_SVR4_PTYS)) +# ifdef hpux +static char PtyProto[] = "/dev/ptym/ptyXY"; +static char TtyProto[] = "/dev/pty/ttyXY"; +# else +# ifdef M_UNIX +static char PtyProto[] = "/dev/ptypXY"; +static char TtyProto[] = "/dev/ttypXY"; +# else +static char PtyProto[] = "/dev/ptyXY"; +static char TtyProto[] = "/dev/ttyXY"; +# endif +# endif /* hpux */ +#endif + +static void initmaster __P((int)); + +#if defined(sun) +/* sun's utmp_update program opens the salve side, thus corrupting + */ +int pty_preopen = 1; +#else +int pty_preopen = 0; +#endif + +/* + * Open all ptys with O_NOCTTY, just to be on the safe side + * (RISCos mips breaks otherwise) + */ +#ifndef O_NOCTTY +# define O_NOCTTY 0 +#endif + +/***************************************************************/ + +static void +initmaster(f) +int f; +{ +#ifdef POSIX + tcflush(f, TCIOFLUSH); +#else +# ifdef TIOCFLUSH + (void) ioctl(f, TIOCFLUSH, (char *) 0); +# endif +#endif +#ifdef LOCKPTY + (void) ioctl(f, TIOCEXCL, (char *) 0); +#endif +} + +void +InitPTY(f) +int f; +{ + if (f < 0) + return; +#if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) && !defined(linux) && !defined(__GLIBC__) && !defined(__osf__) && !defined(M_UNIX) + if (ioctl(f, I_PUSH, "ptem")) + Panic(errno, "InitPTY: cannot I_PUSH ptem"); + if (ioctl(f, I_PUSH, "ldterm")) + Panic(errno, "InitPTY: cannot I_PUSH ldterm"); +# ifdef sun + if (ioctl(f, I_PUSH, "ttcompat")) + Panic(errno, "InitPTY: cannot I_PUSH ttcompat"); +# endif +#endif +} + +/***************************************************************/ + +#if defined(OSX) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + register int f; + if ((f = open_controlling_pty(TtyName)) < 0) + return -1; + initmaster(f); + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#if (defined(sequent) || defined(_SEQUENT_)) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + char *m, *s; + register int f; + + if ((f = getpseudotty(&s, &m)) < 0) + return -1; +#ifdef _SEQUENT_ + fvhangup(s); +#endif + strncpy(PtyName, m, sizeof(PtyName)); + strncpy(TtyName, s, sizeof(TtyName)); + initmaster(f); + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#if defined(__sgi) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + int f; + char *name, *_getpty(); + sigret_t (*sigcld)__P(SIGPROTOARG); + + /* + * SIGCHLD set to SIG_DFL for _getpty() because it may fork() and + * exec() /usr/adm/mkpts + */ + sigcld = signal(SIGCHLD, SIG_DFL); + name = _getpty(&f, O_RDWR | O_NONBLOCK, 0600, 0); + signal(SIGCHLD, sigcld); + + if (name == 0) + return -1; + initmaster(f); + *ttyn = name; + return f; +} +#endif + +/***************************************************************/ + +#if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + register int f; + struct stat buf; + + strcpy(PtyName, "/dev/ptc"); + if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0) + return -1; + if (fstat(f, &buf) < 0) + { + close(f); + return -1; + } + sprintf(TtyName, "/dev/ttyq%d", minor(buf.st_rdev)); + initmaster(f); + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#if defined(HAVE_SVR4_PTYS) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + register int f; + char *m, *ptsname(); + int unlockpt __P((int)), grantpt __P((int)); +#if defined(HAVE_GETPT) && defined(linux) + int getpt __P((void)); +#endif + sigret_t (*sigcld)__P(SIGPROTOARG); + + strcpy(PtyName, "/dev/ptmx"); +#if defined(HAVE_GETPT) && (defined(linux) || defined(__GLIBC__)) + if ((f = getpt()) == -1) +#else + if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1) +#endif + return -1; + + /* + * SIGCHLD set to SIG_DFL for grantpt() because it fork()s and + * exec()s pt_chmod + */ + sigcld = signal(SIGCHLD, SIG_DFL); + if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f)) + { + signal(SIGCHLD, sigcld); + close(f); + return -1; + } + signal(SIGCHLD, sigcld); + if (strlen(m) < sizeof(TtyName)) + strcpy(TtyName, m); + else + { + close(f); + return -1; + } + initmaster(f); + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE) +#define PTY_DONE + +int +OpenPTY(ttyn) +char **ttyn; +{ + register int f; + + /* a dumb looking loop replaced by mycrofts code: */ + strcpy (PtyName, "/dev/ptc"); + if ((f = open (PtyName, O_RDWR | O_NOCTTY)) < 0) + return -1; + strncpy(TtyName, GetPtsPathOrSymlink(f), sizeof(TtyName)); + if (eff_uid && access(TtyName, R_OK | W_OK)) + { + close(f); + return -1; + } + initmaster(f); +# ifdef _IBMR2 + pty_preopen = 1; +# endif + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#if defined(HAVE_OPENPTY) && !defined(PTY_DONE) +#define PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + int f, s; + if (openpty(&f, &s, TtyName, NULL, NULL) != 0) + return -1; + close(s); + initmaster(f); + pty_preopen = 1; + *ttyn = TtyName; + return f; +} +#endif + +/***************************************************************/ + +#ifndef PTY_DONE +int +OpenPTY(ttyn) +char **ttyn; +{ + register char *p, *q, *l, *d; + register int f; + + debug("OpenPTY: Using BSD style ptys.\n"); + strcpy(PtyName, PtyProto); + strcpy(TtyName, TtyProto); + for (p = PtyName; *p != 'X'; p++) + ; + for (q = TtyName; *q != 'X'; q++) + ; + for (l = PTYRANGE0; (*p = *l) != '\0'; l++) + { + for (d = PTYRANGE1; (p[1] = *d) != '\0'; d++) + { + debug1("OpenPTY tries '%s'\n", PtyName); + if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1) + continue; + q[0] = *l; + q[1] = *d; + if (eff_uid && access(TtyName, R_OK | W_OK)) + { + close(f); + continue; + } +#if defined(sun) && defined(TIOCGPGRP) && !defined(SUNOS3) + /* Hack to ensure that the slave side of the pty is + * unused. May not work in anything other than SunOS4.1 + */ + { + int pgrp; + + /* tcgetpgrp does not work (uses TIOCGETPGRP)! */ + if (ioctl(f, TIOCGPGRP, (char *)&pgrp) != -1 || errno != EIO) + { + close(f); + continue; + } + } +#endif + initmaster(f); + *ttyn = TtyName; + return f; + } + } + return -1; +} +#endif + +/* len(/proc/self/fd/) + len(max 64 bit int) */ +#define MAX_PTS_SYMLINK (14 + 21) +char *GetPtsPathOrSymlink(int fd) +{ + int ret; + char *tty_name; + static char tty_symlink[MAX_PTS_SYMLINK]; + + errno = 0; + tty_name = ttyname(fd); + if (!tty_name && errno == ENODEV) { + ret = snprintf(tty_symlink, MAX_PTS_SYMLINK, "/proc/self/fd/%d", fd); + if (ret < 0 || ret >= MAX_PTS_SYMLINK) + return NULL; + /* We are setting errno to ENODEV to allow callers to check + * whether the pts device exists in another namespace. + */ + errno = ENODEV; + return tty_symlink; + } + + return tty_name; +} |