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 53 int 54 openpty(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 /* 106 * Try to push the appropriate streams modules, as described 107 * in Solaris pts(7). 108 */ 109 ioctl(*aslave, I_PUSH, "ptem"); 110 ioctl(*aslave, I_PUSH, "ldterm"); 111 # ifndef __hpux 112 ioctl(*aslave, I_PUSH, "ttcompat"); 113 # endif /* __hpux */ 114 115 return (0); 116 117 #elif defined(HAVE_DEV_PTS_AND_PTC) 118 /* AIX-style pty code. */ 119 const char *ttname; 120 121 if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) 122 return (-1); 123 if ((ttname = ttyname(*amaster)) == NULL) 124 return (-1); 125 if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { 126 close(*amaster); 127 return (-1); 128 } 129 return (0); 130 131 #elif defined(_UNICOS) 132 char ptbuf[64], ttbuf[64]; 133 int i; 134 int highpty; 135 136 highpty = 128; 137 #ifdef _SC_CRAY_NPTY 138 if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1) 139 highpty = 128; 140 #endif /* _SC_CRAY_NPTY */ 141 142 for (i = 0; i < highpty; i++) { 143 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i); 144 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i); 145 if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1) 146 continue; 147 /* Open the slave side. */ 148 if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) { 149 close(*amaster); 150 return (-1); 151 } 152 return (0); 153 } 154 return (-1); 155 156 #else 157 /* BSD-style pty code. */ 158 char ptbuf[64], ttbuf[64]; 159 int i; 160 const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" 161 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 162 const char *ptyminors = "0123456789abcdef"; 163 int num_minors = strlen(ptyminors); 164 int num_ptys = strlen(ptymajors) * num_minors; 165 struct termios tio; 166 167 for (i = 0; i < num_ptys; i++) { 168 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", 169 ptymajors[i / num_minors], ptyminors[i % num_minors]); 170 snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", 171 ptymajors[i / num_minors], ptyminors[i % num_minors]); 172 173 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { 174 /* Try SCO style naming */ 175 snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); 176 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); 177 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) 178 continue; 179 } 180 181 /* Open the slave side. */ 182 if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { 183 close(*amaster); 184 return (-1); 185 } 186 /* set tty modes to a sane state for broken clients */ 187 if (tcgetattr(*amaster, &tio) != -1) { 188 tio.c_lflag |= (ECHO | ISIG | ICANON); 189 tio.c_oflag |= (OPOST | ONLCR); 190 tio.c_iflag |= ICRNL; 191 tcsetattr(*amaster, TCSANOW, &tio); 192 } 193 194 return (0); 195 } 196 return (-1); 197 #endif 198 } 199 200 #endif /* !defined(HAVE_OPENPTY) */ 201 202