Annotation of src/usr.bin/ssh/pty.c, Revision 1.7
1.1 deraadt 1: /*
1.7 ! deraadt 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: */
1.1 deraadt 15:
16: #include "includes.h"
1.7 ! deraadt 17: RCSID("$Id: pty.c,v 1.6 1999/11/23 22:25:54 markus Exp $");
1.1 deraadt 18:
19: #include "pty.h"
20: #include "ssh.h"
21:
22: /* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
23: #if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
24: #undef HAVE_DEV_PTMX
25: #endif
26:
27: #ifndef O_NOCTTY
28: #define O_NOCTTY 0
29: #endif
30:
31: /* Allocates and opens a pty. Returns 0 if no pty could be allocated,
32: or nonzero if a pty was successfully allocated. On success, open file
1.6 markus 33: descriptors for the pty and tty sides and the name of the tty side are
1.1 deraadt 34: returned (the buffer must be able to hold at least 64 characters). */
35:
1.6 markus 36: int
37: pty_allocate(int *ptyfd, int *ttyfd, char *namebuf)
1.1 deraadt 38: {
39: #ifdef HAVE_OPENPTY
1.6 markus 40: /* openpty(3) exists in OSF/1 and some other os'es */
41: int i;
1.1 deraadt 42:
1.6 markus 43: i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL);
44: if (i < 0) {
45: error("openpty: %.100s", strerror(errno));
46: return 0;
47: }
48: return 1;
1.1 deraadt 49: #else /* HAVE_OPENPTY */
50: #ifdef HAVE__GETPTY
1.6 markus 51: /* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates
52: more pty's automagically when needed */
53: char *slave;
54:
55: slave = _getpty(ptyfd, O_RDWR, 0622, 0);
56: if (slave == NULL) {
57: error("_getpty: %.100s", strerror(errno));
58: return 0;
59: }
60: strcpy(namebuf, slave);
61: /* Open the slave side. */
62: *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
63: if (*ttyfd < 0) {
64: error("%.200s: %.100s", namebuf, strerror(errno));
65: close(*ptyfd);
66: return 0;
67: }
68: return 1;
1.1 deraadt 69: #else /* HAVE__GETPTY */
70: #ifdef HAVE_DEV_PTMX
1.6 markus 71: /* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
72: also has bsd-style ptys, but they simply do not work.) */
73: int ptm;
74: char *pts;
75:
76: ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY);
77: if (ptm < 0) {
78: error("/dev/ptmx: %.100s", strerror(errno));
79: return 0;
80: }
81: if (grantpt(ptm) < 0) {
82: error("grantpt: %.100s", strerror(errno));
83: return 0;
84: }
85: if (unlockpt(ptm) < 0) {
86: error("unlockpt: %.100s", strerror(errno));
87: return 0;
88: }
89: pts = ptsname(ptm);
90: if (pts == NULL)
91: error("Slave pty side name could not be obtained.");
92: strcpy(namebuf, pts);
93: *ptyfd = ptm;
94:
95: /* Open the slave side. */
96: *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
97: if (*ttyfd < 0) {
98: error("%.100s: %.100s", namebuf, strerror(errno));
99: close(*ptyfd);
100: return 0;
101: }
102: /* Push the appropriate streams modules, as described in Solaris
103: pts(7). */
104: if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
105: error("ioctl I_PUSH ptem: %.100s", strerror(errno));
106: if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
107: error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
108: if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
109: error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
110: return 1;
1.1 deraadt 111: #else /* HAVE_DEV_PTMX */
112: #ifdef HAVE_DEV_PTS_AND_PTC
1.6 markus 113: /* AIX-style pty code. */
114: const char *name;
1.1 deraadt 115:
1.6 markus 116: *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY);
117: if (*ptyfd < 0) {
118: error("Could not open /dev/ptc: %.100s", strerror(errno));
119: return 0;
120: }
121: name = ttyname(*ptyfd);
122: if (!name)
123: fatal("Open of /dev/ptc returns device for which ttyname fails.");
124: strcpy(namebuf, name);
125: *ttyfd = open(name, O_RDWR | O_NOCTTY);
126: if (*ttyfd < 0) {
127: error("Could not open pty slave side %.100s: %.100s",
128: name, strerror(errno));
129: close(*ptyfd);
130: return 0;
131: }
132: return 1;
1.1 deraadt 133: #else /* HAVE_DEV_PTS_AND_PTC */
1.6 markus 134: /* BSD-style pty code. */
135: char buf[64];
136: int i;
137: const char *ptymajors =
138: "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
139: const char *ptyminors = "0123456789abcdef";
140: int num_minors = strlen(ptyminors);
141: int num_ptys = strlen(ptymajors) * num_minors;
142:
143: for (i = 0; i < num_ptys; i++) {
144: snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
145: ptyminors[i % num_minors]);
146: *ptyfd = open(buf, O_RDWR | O_NOCTTY);
147: if (*ptyfd < 0)
148: continue;
149: snprintf(namebuf, sizeof buf, "/dev/tty%c%c", ptymajors[i / num_minors],
150: ptyminors[i % num_minors]);
151:
152: /* Open the slave side. */
153: *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
154: if (*ttyfd < 0) {
155: error("%.100s: %.100s", namebuf, strerror(errno));
156: close(*ptyfd);
157: return 0;
158: }
159: return 1;
160: }
161: return 0;
1.1 deraadt 162: #endif /* HAVE_DEV_PTS_AND_PTC */
163: #endif /* HAVE_DEV_PTMX */
164: #endif /* HAVE__GETPTY */
165: #endif /* HAVE_OPENPTY */
166: }
167:
1.6 markus 168: /* Releases the tty. Its ownership is returned to root, and permissions to 0666. */
1.1 deraadt 169:
1.6 markus 170: void
171: pty_release(const char *ttyname)
1.1 deraadt 172: {
1.6 markus 173: if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0)
174: debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
175: if (chmod(ttyname, (mode_t) 0666) < 0)
176: debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
1.1 deraadt 177: }
178:
179: /* Makes the tty the processes controlling tty and sets it to sane modes. */
180:
1.6 markus 181: void
182: pty_make_controlling_tty(int *ttyfd, const char *ttyname)
1.1 deraadt 183: {
1.6 markus 184: int fd;
1.1 deraadt 185:
1.6 markus 186: /* First disconnect from the old controlling tty. */
1.1 deraadt 187: #ifdef TIOCNOTTY
1.6 markus 188: fd = open("/dev/tty", O_RDWR | O_NOCTTY);
189: if (fd >= 0) {
190: (void) ioctl(fd, TIOCNOTTY, NULL);
191: close(fd);
192: }
1.1 deraadt 193: #endif /* TIOCNOTTY */
1.6 markus 194: if (setsid() < 0)
195: error("setsid: %.100s", strerror(errno));
1.1 deraadt 196:
1.6 markus 197: /* Verify that we are successfully disconnected from the
198: controlling tty. */
199: fd = open("/dev/tty", O_RDWR | O_NOCTTY);
200: if (fd >= 0) {
201: error("Failed to disconnect from controlling tty.");
202: close(fd);
203: }
204: /* Make it our controlling tty. */
1.1 deraadt 205: #ifdef TIOCSCTTY
1.6 markus 206: debug("Setting controlling tty using TIOCSCTTY.");
207: /* We ignore errors from this, because HPSUX defines TIOCSCTTY,
208: but returns EINVAL with these arguments, and there is
209: absolutely no documentation. */
210: ioctl(*ttyfd, TIOCSCTTY, NULL);
1.1 deraadt 211: #endif /* TIOCSCTTY */
1.6 markus 212: fd = open(ttyname, O_RDWR);
213: if (fd < 0)
214: error("%.100s: %.100s", ttyname, strerror(errno));
215: else
216: close(fd);
217:
218: /* Verify that we now have a controlling tty. */
219: fd = open("/dev/tty", O_WRONLY);
220: if (fd < 0)
221: error("open /dev/tty failed - could not set controlling tty: %.100s",
222: strerror(errno));
223: else {
224: close(fd);
225: }
1.1 deraadt 226: }
227:
228: /* Changes the window size associated with the pty. */
229:
1.6 markus 230: void
231: pty_change_window_size(int ptyfd, int row, int col,
232: int xpixel, int ypixel)
1.1 deraadt 233: {
1.6 markus 234: struct winsize w;
235: w.ws_row = row;
236: w.ws_col = col;
237: w.ws_xpixel = xpixel;
238: w.ws_ypixel = ypixel;
239: (void) ioctl(ptyfd, TIOCSWINSZ, &w);
1.1 deraadt 240: }
![[BACK]](/icons/back.gif){kind=icon}
Return to pty.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh