1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* Copyright (c) 1988 AT&T */ 29 /* All Rights Reserved */ 30 31 32 #pragma weak ptsname = _ptsname 33 #pragma weak grantpt = _grantpt 34 #pragma weak unlockpt = _unlockpt 35 #pragma weak posix_openpt = _posix_openpt 36 37 #include "synonyms.h" 38 #include <mtlib.h> 39 #include <sys/types.h> 40 #include <signal.h> 41 #include <sys/param.h> 42 #include <sys/mkdev.h> 43 #include <sys/fs/ufs_fsdir.h> 44 #include <sys/stream.h> 45 #include <sys/stropts.h> 46 #include <sys/wait.h> 47 #include <sys/signal.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <sys/stat.h> 51 #include <sys/ptms.h> 52 #include <string.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 #include <wait.h> 56 #include <synch.h> 57 #include <thread.h> 58 #include <spawn.h> 59 #include <libc.h> 60 #include <grp.h> 61 #include "tsd.h" 62 63 #define PTSNAME "/dev/pts/" /* slave name */ 64 #define PTLEN 32 /* slave name length */ 65 #define DEFAULT_TTY_GROUP "tty" /* slave device group owner */ 66 67 static void itoa(int, char *); 68 69 /* 70 * Check that fd argument is a file descriptor of an opened master. 71 * Do this by sending an ISPTM ioctl message down stream. Ioctl() 72 * will fail if:(1) fd is not a valid file descriptor.(2) the file 73 * represented by fd does not understand ISPTM(not a master device). 74 * If we have a valid master, get its minor number via fstat(). 75 * Concatenate it to PTSNAME and return it as the name of the slave 76 * device. 77 */ 78 static dev_t 79 ptsdev(int fd) 80 { 81 struct stat64 status; 82 struct strioctl istr; 83 84 istr.ic_cmd = ISPTM; 85 istr.ic_len = 0; 86 istr.ic_timout = 0; 87 istr.ic_dp = NULL; 88 89 if (ioctl(fd, I_STR, &istr) < 0 || fstat64(fd, &status) < 0) 90 return (NODEV); 91 92 return (minor(status.st_rdev)); 93 } 94 95 char * 96 ptsname(int fd) 97 { 98 dev_t dev; 99 char *sname; 100 101 if ((dev = ptsdev(fd)) == NODEV) 102 return (NULL); 103 104 sname = tsdalloc(_T_PTSNAME, PTLEN, NULL); 105 if (sname == NULL) 106 return (NULL); 107 (void) strcpy(sname, PTSNAME); 108 itoa(dev, sname + strlen(PTSNAME)); 109 110 /* 111 * This lookup will create the /dev/pts node (if the corresponding 112 * pty exists. 113 */ 114 if (access(sname, F_OK) == 0) 115 return (sname); 116 117 return (NULL); 118 } 119 120 /* 121 * Send an ioctl down to the master device requesting the 122 * master/slave pair be unlocked. 123 */ 124 int 125 unlockpt(int fd) 126 { 127 struct strioctl istr; 128 129 istr.ic_cmd = UNLKPT; 130 istr.ic_len = 0; 131 istr.ic_timout = 0; 132 istr.ic_dp = NULL; 133 134 if (ioctl(fd, I_STR, &istr) < 0) 135 return (-1); 136 137 return (0); 138 } 139 140 int 141 grantpt(int fd) 142 { 143 struct strioctl istr; 144 pt_own_t pto; 145 struct group *gr_name; 146 147 /* validate the file descriptor before proceeding */ 148 if (ptsdev(fd) == NODEV) 149 return (-1); 150 151 pto.pto_ruid = getuid(); 152 153 gr_name = getgrnam(DEFAULT_TTY_GROUP); 154 if (gr_name) 155 pto.pto_rgid = gr_name->gr_gid; 156 else 157 pto.pto_rgid = getgid(); 158 159 istr.ic_cmd = OWNERPT; 160 istr.ic_len = sizeof (pt_own_t); 161 istr.ic_timout = 0; 162 istr.ic_dp = (char *)&pto; 163 164 if (ioctl(fd, I_STR, &istr) != 0) { 165 errno = EACCES; 166 return (-1); 167 } 168 169 return (0); 170 } 171 172 /* 173 * Send an ioctl down to the master device requesting the master/slave pair 174 * be assigned to the given zone. 175 */ 176 int 177 zonept(int fd, zoneid_t zoneid) 178 { 179 struct strioctl istr; 180 181 istr.ic_cmd = ZONEPT; 182 istr.ic_len = sizeof (zoneid); 183 istr.ic_timout = 0; 184 istr.ic_dp = (char *)&zoneid; 185 186 if (ioctl(fd, I_STR, &istr) != 0) { 187 return (-1); 188 } 189 return (0); 190 } 191 192 193 static void 194 itoa(int i, char *ptr) 195 { 196 int dig = 0; 197 int tempi; 198 199 tempi = i; 200 do { 201 dig++; 202 tempi /= 10; 203 } while (tempi); 204 205 ptr += dig; 206 *ptr = '\0'; 207 while (--dig >= 0) { 208 *(--ptr) = i % 10 + '0'; 209 i /= 10; 210 } 211 } 212 213 214 /* 215 * added for SUSv3 standard 216 * 217 * Open a pseudo-terminal device. External interface. 218 */ 219 220 int 221 posix_openpt(int oflag) 222 { 223 return (open("/dev/ptmx", oflag)); 224 } 225