Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * |
| 3 | * pty.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Fri Mar 17 04:37:25 1995 ylo |
| 11 | * |
| 12 | * Allocating a pseudo-terminal, and making it the controlling tty. |
| 13 | * |
| 14 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #include "includes.h" |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 17 | RCSID("$Id: pty.c,v 1.5 1999/11/25 00:54:59 damien Exp $"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 18 | |
| 19 | #include "pty.h" |
| 20 | #include "ssh.h" |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 21 | |
| 22 | #ifdef HAVE_PTY_H |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 23 | #include <pty.h> |
| 24 | #endif /* HAVE_PTY_H */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 26 | /* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */ |
| 27 | #if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY) |
| 28 | #undef HAVE_DEV_PTMX |
| 29 | #endif |
| 30 | |
| 31 | #ifndef O_NOCTTY |
| 32 | #define O_NOCTTY 0 |
| 33 | #endif |
| 34 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 35 | /* |
| 36 | * Allocates and opens a pty. Returns 0 if no pty could be allocated, or |
| 37 | * nonzero if a pty was successfully allocated. On success, open file |
| 38 | * descriptors for the pty and tty sides and the name of the tty side are |
| 39 | * returned (the buffer must be able to hold at least 64 characters). |
| 40 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 42 | int |
| 43 | pty_allocate(int *ptyfd, int *ttyfd, char *namebuf) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | { |
| 45 | #ifdef HAVE_OPENPTY |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 46 | /* openpty(3) exists in OSF/1 and some other os'es */ |
| 47 | int i; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 48 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 49 | i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL); |
| 50 | if (i < 0) { |
| 51 | error("openpty: %.100s", strerror(errno)); |
| 52 | return 0; |
| 53 | } |
| 54 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | #else /* HAVE_OPENPTY */ |
| 56 | #ifdef HAVE__GETPTY |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 57 | /* |
| 58 | * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more |
| 59 | * pty's automagically when needed |
| 60 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 61 | char *slave; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 62 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 63 | slave = _getpty(ptyfd, O_RDWR, 0622, 0); |
| 64 | if (slave == NULL) { |
| 65 | error("_getpty: %.100s", strerror(errno)); |
| 66 | return 0; |
| 67 | } |
| 68 | strcpy(namebuf, slave); |
| 69 | /* Open the slave side. */ |
| 70 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); |
| 71 | if (*ttyfd < 0) { |
| 72 | error("%.200s: %.100s", namebuf, strerror(errno)); |
| 73 | close(*ptyfd); |
| 74 | return 0; |
| 75 | } |
| 76 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | #else /* HAVE__GETPTY */ |
| 78 | #ifdef HAVE_DEV_PTMX |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 79 | /* |
| 80 | * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 |
| 81 | * also has bsd-style ptys, but they simply do not work.) |
| 82 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 83 | int ptm; |
| 84 | char *pts; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 86 | ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY); |
| 87 | if (ptm < 0) { |
| 88 | error("/dev/ptmx: %.100s", strerror(errno)); |
| 89 | return 0; |
| 90 | } |
| 91 | if (grantpt(ptm) < 0) { |
| 92 | error("grantpt: %.100s", strerror(errno)); |
| 93 | return 0; |
| 94 | } |
| 95 | if (unlockpt(ptm) < 0) { |
| 96 | error("unlockpt: %.100s", strerror(errno)); |
| 97 | return 0; |
| 98 | } |
| 99 | pts = ptsname(ptm); |
| 100 | if (pts == NULL) |
| 101 | error("Slave pty side name could not be obtained."); |
| 102 | strcpy(namebuf, pts); |
| 103 | *ptyfd = ptm; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | /* Open the slave side. */ |
| 106 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); |
| 107 | if (*ttyfd < 0) { |
| 108 | error("%.100s: %.100s", namebuf, strerror(errno)); |
| 109 | close(*ptyfd); |
| 110 | return 0; |
| 111 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 112 | /* Push the appropriate streams modules, as described in Solaris pts(7). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 113 | if (ioctl(*ttyfd, I_PUSH, "ptem") < 0) |
| 114 | error("ioctl I_PUSH ptem: %.100s", strerror(errno)); |
| 115 | if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0) |
| 116 | error("ioctl I_PUSH ldterm: %.100s", strerror(errno)); |
| 117 | if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) |
| 118 | error("ioctl I_PUSH ttcompat: %.100s", strerror(errno)); |
| 119 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 120 | #else /* HAVE_DEV_PTMX */ |
| 121 | #ifdef HAVE_DEV_PTS_AND_PTC |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 122 | /* AIX-style pty code. */ |
| 123 | const char *name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 124 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY); |
| 126 | if (*ptyfd < 0) { |
| 127 | error("Could not open /dev/ptc: %.100s", strerror(errno)); |
| 128 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 129 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 130 | name = ttyname(*ptyfd); |
| 131 | if (!name) |
| 132 | fatal("Open of /dev/ptc returns device for which ttyname fails."); |
| 133 | strcpy(namebuf, name); |
| 134 | *ttyfd = open(name, O_RDWR | O_NOCTTY); |
| 135 | if (*ttyfd < 0) { |
| 136 | error("Could not open pty slave side %.100s: %.100s", |
| 137 | name, strerror(errno)); |
| 138 | close(*ptyfd); |
| 139 | return 0; |
| 140 | } |
| 141 | return 1; |
| 142 | #else /* HAVE_DEV_PTS_AND_PTC */ |
| 143 | /* BSD-style pty code. */ |
| 144 | char buf[64]; |
| 145 | int i; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 146 | const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 147 | const char *ptyminors = "0123456789abcdef"; |
| 148 | int num_minors = strlen(ptyminors); |
| 149 | int num_ptys = strlen(ptymajors) * num_minors; |
| 150 | |
| 151 | for (i = 0; i < num_ptys; i++) { |
| 152 | snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors], |
| 153 | ptyminors[i % num_minors]); |
| 154 | *ptyfd = open(buf, O_RDWR | O_NOCTTY); |
| 155 | if (*ptyfd < 0) |
| 156 | continue; |
| 157 | snprintf(namebuf, sizeof buf, "/dev/tty%c%c", ptymajors[i / num_minors], |
| 158 | ptyminors[i % num_minors]); |
| 159 | |
| 160 | /* Open the slave side. */ |
| 161 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); |
| 162 | if (*ttyfd < 0) { |
| 163 | error("%.100s: %.100s", namebuf, strerror(errno)); |
| 164 | close(*ptyfd); |
| 165 | return 0; |
| 166 | } |
| 167 | return 1; |
| 168 | } |
| 169 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 170 | #endif /* HAVE_DEV_PTS_AND_PTC */ |
| 171 | #endif /* HAVE_DEV_PTMX */ |
| 172 | #endif /* HAVE__GETPTY */ |
| 173 | #endif /* HAVE_OPENPTY */ |
| 174 | } |
| 175 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 176 | /* Releases the tty. Its ownership is returned to root, and permissions to 0666. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 178 | void |
| 179 | pty_release(const char *ttyname) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 181 | if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0) |
| 182 | debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno)); |
| 183 | if (chmod(ttyname, (mode_t) 0666) < 0) |
| 184 | debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | /* Makes the tty the processes controlling tty and sets it to sane modes. */ |
| 188 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 189 | void |
| 190 | pty_make_controlling_tty(int *ttyfd, const char *ttyname) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 191 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 192 | int fd; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 193 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 194 | /* First disconnect from the old controlling tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 195 | #ifdef TIOCNOTTY |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 196 | fd = open("/dev/tty", O_RDWR | O_NOCTTY); |
| 197 | if (fd >= 0) { |
| 198 | (void) ioctl(fd, TIOCNOTTY, NULL); |
| 199 | close(fd); |
| 200 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | #endif /* TIOCNOTTY */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 202 | if (setsid() < 0) |
| 203 | error("setsid: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 205 | /* |
| 206 | * Verify that we are successfully disconnected from the controlling |
| 207 | * tty. |
| 208 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 209 | fd = open("/dev/tty", O_RDWR | O_NOCTTY); |
| 210 | if (fd >= 0) { |
| 211 | error("Failed to disconnect from controlling tty."); |
| 212 | close(fd); |
| 213 | } |
| 214 | /* Make it our controlling tty. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | #ifdef TIOCSCTTY |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 216 | debug("Setting controlling tty using TIOCSCTTY."); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame^] | 217 | /* |
| 218 | * We ignore errors from this, because HPSUX defines TIOCSCTTY, but |
| 219 | * returns EINVAL with these arguments, and there is absolutely no |
| 220 | * documentation. |
| 221 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | ioctl(*ttyfd, TIOCSCTTY, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 223 | #endif /* TIOCSCTTY */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | fd = open(ttyname, O_RDWR); |
| 225 | if (fd < 0) |
| 226 | error("%.100s: %.100s", ttyname, strerror(errno)); |
| 227 | else |
| 228 | close(fd); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 229 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 230 | /* Verify that we now have a controlling tty. */ |
| 231 | fd = open("/dev/tty", O_WRONLY); |
| 232 | if (fd < 0) |
| 233 | error("open /dev/tty failed - could not set controlling tty: %.100s", |
| 234 | strerror(errno)); |
| 235 | else { |
| 236 | close(fd); |
| 237 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* Changes the window size associated with the pty. */ |
| 241 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 242 | void |
| 243 | pty_change_window_size(int ptyfd, int row, int col, |
| 244 | int xpixel, int ypixel) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 245 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 246 | struct winsize w; |
| 247 | w.ws_row = row; |
| 248 | w.ws_col = col; |
| 249 | w.ws_xpixel = xpixel; |
| 250 | w.ws_ypixel = ypixel; |
| 251 | (void) ioctl(ptyfd, TIOCSWINSZ, &w); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 252 | } |