222 lines
6.5 KiB
C
222 lines
6.5 KiB
C
/*
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* stunnel TLS offloading and load-balancing proxy
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* Copyright (C) 1998-2017 Michal Trojnara <Michal.Trojnara@stunnel.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses>.
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*
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* Linking stunnel statically or dynamically with other modules is making
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* a combined work based on stunnel. Thus, the terms and conditions of
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* the GNU General Public License cover the whole combination.
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*
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* In addition, as a special exception, the copyright holder of stunnel
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* gives you permission to combine stunnel with free software programs or
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* libraries that are released under the GNU LGPL and with code included
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* in the standard release of OpenSSL under the OpenSSL License (or
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* modified versions of such code, with unchanged license). You may copy
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* and distribute such a system following the terms of the GNU GPL for
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* stunnel and the licenses of the other code concerned.
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*
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* Note that people who make modified versions of stunnel are not obligated
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* to grant this special exception for their modified versions; it is their
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* choice whether to do so. The GNU General Public License gives permission
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* to release a modified version without this exception; this exception
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* also makes it possible to release a modified version which carries
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* forward this exception.
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*/
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#include "common.h"
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#include "prototypes.h"
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#ifdef HAVE_UTIL_H
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#include <util.h>
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#endif /* HAVE_UTIL_H */
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif /* HAVE_SYS_IOCTL_H */
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/* pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
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#if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
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#undef HAVE_DEV_PTMX
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#endif /* HAVE__GETPTY || HAVE_OPENPTY */
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#ifdef HAVE_PTY_H
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#include <pty.h>
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#endif /* HAVE_PTY_H */
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#ifdef HAVE_LIBUTIL_H
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#include <libutil.h>
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#endif /* HAVE_LIBUTIL_H */
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif /* O_NOCTTY */
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/*
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* allocates and opens a pty
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* returns -1 if no pty could be allocated, or zero if a pty was successfully
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* allocated
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* on success, open file descriptors for the pty and tty sides and the name of
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* the tty side are returned
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* the buffer must be able to hold at least 64 characters
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*/
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int pty_allocate(int *ptyfd, int *ttyfd, char *namebuf) {
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#if defined(HAVE_OPENPTY) || defined(BSD4_4) && !defined(__INNOTEK_LIBC__)
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/* openpty(3) exists in OSF/1 and some other os'es */
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char buf[64];
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int i;
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i=openpty(ptyfd, ttyfd, buf, NULL, NULL);
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if(i<0) {
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ioerror("openpty");
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return -1;
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}
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strcpy(namebuf, buf); /* possible truncation */
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return 0;
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#else /* HAVE_OPENPTY */
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#ifdef HAVE__GETPTY
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/*
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* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
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* pty's automagically when needed
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*/
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char *slave;
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slave=_getpty(ptyfd, O_RDWR, 0622, 0);
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if(slave==NULL) {
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ioerror("_getpty");
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return -1;
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}
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strcpy(namebuf, slave);
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/* open the slave side */
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*ttyfd=open(namebuf, O_RDWR|O_NOCTTY);
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if(*ttyfd<0) {
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ioerror(namebuf);
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close(*ptyfd);
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return -1;
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}
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return 0;
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#else /* HAVE__GETPTY */
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#if defined(HAVE_DEV_PTMX)
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/*
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* this code is used e.g. on Solaris 2.x
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* note that Solaris 2.3 * also has bsd-style ptys, but they simply do not
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* work
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*/
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int ptm; char *pts;
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ptm=open("/dev/ptmx", O_RDWR|O_NOCTTY);
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if(ptm<0) {
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ioerror("/dev/ptmx");
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return -1;
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}
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if(grantpt(ptm)<0) {
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ioerror("grantpt");
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/* return -1; */
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/* can you tell me why it doesn't work? */
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}
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if(unlockpt(ptm)<0) {
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ioerror("unlockpt");
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return -1;
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}
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pts=ptsname(ptm);
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if(pts==NULL)
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s_log(LOG_ERR, "Slave pty side name could not be obtained");
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strcpy(namebuf, pts);
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*ptyfd=ptm;
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/* open the slave side */
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*ttyfd=open(namebuf, O_RDWR|O_NOCTTY);
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if(*ttyfd<0) {
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ioerror(namebuf);
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close(*ptyfd);
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return -1;
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}
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/* push the appropriate streams modules, as described in Solaris pts(7) */
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if(ioctl(*ttyfd, I_PUSH, "ptem")<0)
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ioerror("ioctl I_PUSH ptem");
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if(ioctl(*ttyfd, I_PUSH, "ldterm")<0)
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ioerror("ioctl I_PUSH ldterm");
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if(ioctl(*ttyfd, I_PUSH, "ttcompat")<0)
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ioerror("ioctl I_PUSH ttcompat");
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return 0;
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#else /* HAVE_DEV_PTMX */
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#ifdef HAVE_DEV_PTS_AND_PTC
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/* AIX-style pty code. */
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const char *name;
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*ptyfd=open("/dev/ptc", O_RDWR|O_NOCTTY);
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if(*ptyfd<0) {
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ioerror("open(/dev/ptc)");
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return -1;
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}
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name=ttyname(*ptyfd);
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if(!name) {
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s_log(LOG_ERR, "Open of /dev/ptc returns device for which ttyname fails");
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return -1;
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}
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strcpy(namebuf, name);
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*ttyfd=open(name, O_RDWR|O_NOCTTY);
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if(*ttyfd<0) {
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ioerror(name);
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close(*ptyfd);
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return -1;
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}
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return 0;
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#else /* HAVE_DEV_PTS_AND_PTC */
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/* BSD-style pty code. */
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char buf[64];
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size_t i;
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const char *ptymajors="pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
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const char *ptyminors="0123456789abcdef";
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size_t num_minors=strlen(ptyminors);
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size_t num_ptys=strlen(ptymajors)*num_minors;
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for(i=0; i<num_ptys; i++) {
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#ifdef HAVE_SNPRINTF
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snprintf(buf, sizeof buf,
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#else
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sprintf(buf,
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#endif
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"/dev/pty%c%c", ptymajors[i/num_minors],
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ptyminors[i%num_minors]);
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*ptyfd=open(buf, O_RDWR|O_NOCTTY);
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if(*ptyfd<0)
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continue;
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#ifdef HAVE_SNPRINTF
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snprintf(namebuf, 64,
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#else
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sprintf(namebuf,
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#endif
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"/dev/tty%c%c",
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ptymajors[i/num_minors], ptyminors[i%num_minors]);
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/* open the slave side */
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*ttyfd=open(namebuf, O_RDWR | O_NOCTTY);
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if(*ttyfd<0) {
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ioerror(namebuf);
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close(*ptyfd);
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return -1;
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}
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return 0;
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}
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return -1;
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#endif /* HAVE_DEV_PTS_AND_PTC */
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#endif /* HAVE_DEV_PTMX */
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#endif /* HAVE__GETPTY */
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#endif /* HAVE_OPENPTY */
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}
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/* end of pty.c */
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