bsd-openpty.c revision 323134
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#include <sys/types.h> 39 40#include <stdlib.h> 41 42#ifdef HAVE_SYS_STAT_H 43# include <sys/stat.h> 44#endif 45#ifdef HAVE_SYS_IOCTL_H 46# include <sys/ioctl.h> 47#endif 48 49#ifdef HAVE_FCNTL_H 50# include <fcntl.h> 51#endif 52 53#ifdef HAVE_UTIL_H 54# include <util.h> 55#endif /* HAVE_UTIL_H */ 56 57#ifdef HAVE_PTY_H 58# include <pty.h> 59#endif 60#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 61# include <sys/stropts.h> 62#endif 63 64#include <signal.h> 65#include <string.h> 66#include <unistd.h> 67 68#ifndef O_NOCTTY 69#define O_NOCTTY 0 70#endif 71 72int 73openpty(int *amaster, int *aslave, char *name, struct termios *termp, 74 struct winsize *winp) 75{ 76#if defined(HAVE__GETPTY) 77 /* 78 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more 79 * pty's automagically when needed 80 */ 81 char *slave; 82 83 if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL) 84 return (-1); 85 86 /* Open the slave side. */ 87 if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) { 88 close(*amaster); 89 return (-1); 90 } 91 return (0); 92 93#elif defined(HAVE_DEV_PTMX) 94 /* 95 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 96 * also has bsd-style ptys, but they simply do not work.) 97 */ 98 int ptm; 99 char *pts; 100 mysig_t old_signal; 101 102 if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1) 103 return (-1); 104 105 /* XXX: need to close ptm on error? */ 106 old_signal = signal(SIGCHLD, SIG_DFL); 107 if (grantpt(ptm) < 0) 108 return (-1); 109 signal(SIGCHLD, old_signal); 110 111 if (unlockpt(ptm) < 0) 112 return (-1); 113 114 if ((pts = ptsname(ptm)) == NULL) 115 return (-1); 116 *amaster = ptm; 117 118 /* Open the slave side. */ 119 if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) { 120 close(*amaster); 121 return (-1); 122 } 123 124 /* 125 * Try to push the appropriate streams modules, as described 126 * in Solaris pts(7). 127 */ 128 ioctl(*aslave, I_PUSH, "ptem"); 129 ioctl(*aslave, I_PUSH, "ldterm"); 130# ifndef __hpux 131 ioctl(*aslave, I_PUSH, "ttcompat"); 132# endif /* __hpux */ 133 134 return (0); 135 136#elif defined(HAVE_DEV_PTS_AND_PTC) 137 /* AIX-style pty code. */ 138 const char *ttname; 139 140 if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) 141 return (-1); 142 if ((ttname = ttyname(*amaster)) == NULL) 143 return (-1); 144 if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { 145 close(*amaster); 146 return (-1); 147 } 148 return (0); 149 150#elif defined(_UNICOS) 151 char ptbuf[64], ttbuf[64]; 152 int i; 153 int highpty; 154 155 highpty = 128; 156#ifdef _SC_CRAY_NPTY 157 if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1) 158 highpty = 128; 159#endif /* _SC_CRAY_NPTY */ 160 161 for (i = 0; i < highpty; i++) { 162 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i); 163 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i); 164 if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1) 165 continue; 166 /* Open the slave side. */ 167 if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) { 168 close(*amaster); 169 return (-1); 170 } 171 return (0); 172 } 173 return (-1); 174 175#else 176 /* BSD-style pty code. */ 177 char ptbuf[64], ttbuf[64]; 178 int i; 179 const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" 180 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 181 const char *ptyminors = "0123456789abcdef"; 182 int num_minors = strlen(ptyminors); 183 int num_ptys = strlen(ptymajors) * num_minors; 184 struct termios tio; 185 186 for (i = 0; i < num_ptys; i++) { 187 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", 188 ptymajors[i / num_minors], ptyminors[i % num_minors]); 189 snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", 190 ptymajors[i / num_minors], ptyminors[i % num_minors]); 191 192 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { 193 /* Try SCO style naming */ 194 snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); 195 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); 196 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) 197 continue; 198 } 199 200 /* Open the slave side. */ 201 if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { 202 close(*amaster); 203 return (-1); 204 } 205 /* set tty modes to a sane state for broken clients */ 206 if (tcgetattr(*amaster, &tio) != -1) { 207 tio.c_lflag |= (ECHO | ISIG | ICANON); 208 tio.c_oflag |= (OPOST | ONLCR); 209 tio.c_iflag |= ICRNL; 210 tcsetattr(*amaster, TCSANOW, &tio); 211 } 212 213 return (0); 214 } 215 return (-1); 216#endif 217} 218 219#endif /* !defined(HAVE_OPENPTY) */ 220 221