bsd-openpty.c revision 126274
1/* 2 * Please note: this implementation of openpty() is far from complete. 3 * it is just enough for portable OpenSSH's needs. 4 */ 5 6/* 7 * Copyright (c) 2004 Damien Miller <djm@mindrot.org> 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 */ 21 22/* 23 * Author: Tatu Ylonen <ylo@cs.hut.fi> 24 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 25 * All rights reserved 26 * Allocating a pseudo-terminal, and making it the controlling tty. 27 * 28 * As far as I am concerned, the code I have written for this software 29 * can be used freely for any purpose. Any derived versions of this 30 * software must be clearly marked as such, and if the derived work is 31 * incompatible with the protocol description in the RFC file, it must be 32 * called by a name other than "ssh" or "Secure Shell". 33 */ 34 35#include "includes.h" 36#if !defined(HAVE_OPENPTY) 37 38#ifdef HAVE_UTIL_H 39# include <util.h> 40#endif /* HAVE_UTIL_H */ 41 42#ifdef HAVE_PTY_H 43# include <pty.h> 44#endif 45#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 46# include <sys/stropts.h> 47#endif 48 49#ifndef O_NOCTTY 50#define O_NOCTTY 0 51#endif 52 53int 54openpty(int *amaster, int *aslave, char *name, struct termios *termp, 55 struct winsize *winp) 56{ 57#if defined(HAVE__GETPTY) 58 /* 59 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more 60 * pty's automagically when needed 61 */ 62 char *slave; 63 64 if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL) 65 return (-1); 66 67 /* Open the slave side. */ 68 if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) { 69 close(*amaster); 70 return (-1); 71 } 72 return (0); 73 74#elif defined(HAVE_DEV_PTMX) 75 /* 76 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 77 * also has bsd-style ptys, but they simply do not work.) 78 */ 79 int ptm; 80 char *pts; 81 mysig_t old_signal; 82 83 if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1) 84 return (-1); 85 86 /* XXX: need to close ptm on error? */ 87 old_signal = signal(SIGCHLD, SIG_DFL); 88 if (grantpt(ptm) < 0) 89 return (-1); 90 signal(SIGCHLD, old_signal); 91 92 if (unlockpt(ptm) < 0) 93 return (-1); 94 95 if ((pts = ptsname(ptm)) == NULL) 96 return (-1); 97 *amaster = ptm; 98 99 /* Open the slave side. */ 100 if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) { 101 close(*amaster); 102 return (-1); 103 } 104 105#ifndef HAVE_CYGWIN 106 /* 107 * Try to push the appropriate streams modules, as described 108 * in Solaris pts(7). 109 */ 110 ioctl(*aslave, I_PUSH, "ptem"); 111 ioctl(*aslave, I_PUSH, "ldterm"); 112# ifndef __hpux 113 ioctl(*aslave, I_PUSH, "ttcompat"); 114# endif /* __hpux */ 115#endif /* HAVE_CYGWIN */ 116 117 return (0); 118 119#elif defined(HAVE_DEV_PTS_AND_PTC) 120 /* AIX-style pty code. */ 121 const char *ttname; 122 123 if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) 124 return (-1); 125 if ((ttname = ttyname(*amaster)) == NULL) 126 return (-1); 127 if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { 128 close(*amaster); 129 return (-1); 130 } 131 return (0); 132 133#elif defined(_UNICOS) 134 char ptbuf[64], ttbuf[64]; 135 int i; 136 int highpty; 137 138 highpty = 128; 139#ifdef _SC_CRAY_NPTY 140 if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1) 141 highpty = 128; 142#endif /* _SC_CRAY_NPTY */ 143 144 for (i = 0; i < highpty; i++) { 145 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i); 146 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i); 147 if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1) 148 continue; 149 /* Open the slave side. */ 150 if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) { 151 close(*amaster); 152 return (-1); 153 } 154 return (0); 155 } 156 return (-1); 157 158#else 159 /* BSD-style pty code. */ 160 char ptbuf[64], ttbuf[64]; 161 int i; 162 const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" 163 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 164 const char *ptyminors = "0123456789abcdef"; 165 int num_minors = strlen(ptyminors); 166 int num_ptys = strlen(ptymajors) * num_minors; 167 struct termios tio; 168 169 for (i = 0; i < num_ptys; i++) { 170 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", 171 ptymajors[i / num_minors], ptyminors[i % num_minors]); 172 snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", 173 ptymajors[i / num_minors], ptyminors[i % num_minors]); 174 175 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { 176 /* Try SCO style naming */ 177 snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); 178 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); 179 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) 180 continue; 181 } 182 183 /* Open the slave side. */ 184 if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { 185 close(*amaster); 186 return (-1); 187 } 188 /* set tty modes to a sane state for broken clients */ 189 if (tcgetattr(*amaster, &tio) != -1) { 190 tio.c_lflag |= (ECHO | ISIG | ICANON); 191 tio.c_oflag |= (OPOST | ONLCR); 192 tio.c_iflag |= ICRNL; 193 tcsetattr(*amaster, TCSANOW, &tio); 194 } 195 196 return (0); 197 } 198 return (-1); 199#endif 200} 201 202#endif /* !defined(HAVE_OPENPTY) */ 203 204