diff options
Diffstat (limited to 'pty.c')
| -rw-r--r-- | pty.c | 398 |
1 files changed, 187 insertions, 211 deletions
@@ -1,28 +1,28 @@ /* - -pty.c - -Author: Tatu Ylonen <ylo@cs.hut.fi> - -Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - All rights reserved - -Created: Fri Mar 17 04:37:25 1995 ylo - -Allocating a pseudo-terminal, and making it the controlling tty. - -*/ + * + * pty.c + * + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * + * Created: Fri Mar 17 04:37:25 1995 ylo + * + * Allocating a pseudo-terminal, and making it the controlling tty. + * + */ #include "includes.h" -RCSID("$Id: pty.c,v 1.3 1999/11/15 04:40:55 damien Exp $"); +RCSID("$Id: pty.c,v 1.4 1999/11/24 13:26:22 damien Exp $"); + +#include "pty.h" +#include "ssh.h" #ifdef HAVE_PTY_H #include <pty.h> #endif /* HAVE_PTY_H */ -#include "pty.h" -#include "ssh.h" - /* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */ #if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY) #undef HAVE_DEV_PTMX @@ -34,235 +34,211 @@ RCSID("$Id: pty.c,v 1.3 1999/11/15 04:40:55 damien Exp $"); /* Allocates and opens a pty. Returns 0 if no pty could be allocated, or nonzero if a pty was successfully allocated. On success, open file - descriptors for the pty and tty sides and the name of the tty side are + descriptors for the pty and tty sides and the name of the tty side are returned (the buffer must be able to hold at least 64 characters). */ -int pty_allocate(int *ptyfd, int *ttyfd, char *namebuf) +int +pty_allocate(int *ptyfd, int *ttyfd, char *namebuf) { #ifdef HAVE_OPENPTY + /* openpty(3) exists in OSF/1 and some other os'es */ + int i; - /* openpty(3) exists in OSF/1 and some other os'es */ - - int i; - - i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL); - - if (i < 0) - { - error("openpty: %.100s", strerror(errno)); - return 0; - } - - return 1; - + i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL); + if (i < 0) { + error("openpty: %.100s", strerror(errno)); + return 0; + } + return 1; #else /* HAVE_OPENPTY */ #ifdef HAVE__GETPTY - - /* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more - pty's automagically when needed */ - - char *slave; - - slave = _getpty(ptyfd, O_RDWR, 0622, 0); - if (slave == NULL) - { - error("_getpty: %.100s", strerror(errno)); - return 0; - } - strcpy(namebuf, slave); - /* Open the slave side. */ - *ttyfd = open(namebuf, O_RDWR|O_NOCTTY); - if (*ttyfd < 0) - { - error("%.200s: %.100s", namebuf, strerror(errno)); - close(*ptyfd); - return 0; - } - return 1; - + /* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates + more pty's automagically when needed */ + char *slave; + + slave = _getpty(ptyfd, O_RDWR, 0622, 0); + if (slave == NULL) { + error("_getpty: %.100s", strerror(errno)); + return 0; + } + strcpy(namebuf, slave); + /* Open the slave side. */ + *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); + if (*ttyfd < 0) { + error("%.200s: %.100s", namebuf, strerror(errno)); + close(*ptyfd); + return 0; + } + return 1; #else /* HAVE__GETPTY */ #ifdef HAVE_DEV_PTMX - /* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 also has - bsd-style ptys, but they simply do not work.) */ - - int ptm; - char *pts; - - ptm = open("/dev/ptmx", O_RDWR|O_NOCTTY); - if (ptm < 0) - { - error("/dev/ptmx: %.100s", strerror(errno)); - return 0; - } - if (grantpt(ptm) < 0) - { - error("grantpt: %.100s", strerror(errno)); - return 0; - } - if (unlockpt(ptm) < 0) - { - error("unlockpt: %.100s", strerror(errno)); - return 0; - } - pts = ptsname(ptm); - if (pts == NULL) - error("Slave pty side name could not be obtained."); - strcpy(namebuf, pts); - *ptyfd = ptm; - - /* Open the slave side. */ - *ttyfd = open(namebuf, O_RDWR|O_NOCTTY); - if (*ttyfd < 0) - { - error("%.100s: %.100s", namebuf, strerror(errno)); - close(*ptyfd); - return 0; - } - /* Push the appropriate streams modules, as described in Solaris pts(7). */ - if (ioctl(*ttyfd, I_PUSH, "ptem") < 0) - error("ioctl I_PUSH ptem: %.100s", strerror(errno)); - if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0) - error("ioctl I_PUSH ldterm: %.100s", strerror(errno)); - if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) - error("ioctl I_PUSH ttcompat: %.100s", strerror(errno)); - return 1; - + /* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 + also has bsd-style ptys, but they simply do not work.) */ + int ptm; + char *pts; + + ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY); + if (ptm < 0) { + error("/dev/ptmx: %.100s", strerror(errno)); + return 0; + } + if (grantpt(ptm) < 0) { + error("grantpt: %.100s", strerror(errno)); + return 0; + } + if (unlockpt(ptm) < 0) { + error("unlockpt: %.100s", strerror(errno)); + return 0; + } + pts = ptsname(ptm); + if (pts == NULL) + error("Slave pty side name could not be obtained."); + strcpy(namebuf, pts); + *ptyfd = ptm; + + /* Open the slave side. */ + *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); + if (*ttyfd < 0) { + error("%.100s: %.100s", namebuf, strerror(errno)); + close(*ptyfd); + return 0; + } + /* Push the appropriate streams modules, as described in Solaris + pts(7). */ + if (ioctl(*ttyfd, I_PUSH, "ptem") < 0) + error("ioctl I_PUSH ptem: %.100s", strerror(errno)); + if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0) + error("ioctl I_PUSH ldterm: %.100s", strerror(errno)); + if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) + error("ioctl I_PUSH ttcompat: %.100s", strerror(errno)); + return 1; #else /* HAVE_DEV_PTMX */ #ifdef HAVE_DEV_PTS_AND_PTC + /* AIX-style pty code. */ + const char *name; - /* AIX-style pty code. */ - - const char *name; - - *ptyfd = open("/dev/ptc", O_RDWR|O_NOCTTY); - if (*ptyfd < 0) - { - error("Could not open /dev/ptc: %.100s", strerror(errno)); - return 0; - } - name = ttyname(*ptyfd); - if (!name) - fatal("Open of /dev/ptc returns device for which ttyname fails."); - strcpy(namebuf, name); - *ttyfd = open(name, O_RDWR|O_NOCTTY); - if (*ttyfd < 0) - { - error("Could not open pty slave side %.100s: %.100s", - name, strerror(errno)); - close(*ptyfd); - return 0; - } - return 1; - + *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY); + if (*ptyfd < 0) { + error("Could not open /dev/ptc: %.100s", strerror(errno)); + return 0; + } + name = ttyname(*ptyfd); + if (!name) + fatal("Open of /dev/ptc returns device for which ttyname fails."); + strcpy(namebuf, name); + *ttyfd = open(name, O_RDWR | O_NOCTTY); + if (*ttyfd < 0) { + error("Could not open pty slave side %.100s: %.100s", + name, strerror(errno)); + close(*ptyfd); + return 0; + } + return 1; #else /* HAVE_DEV_PTS_AND_PTC */ - /* BSD-style pty code. */ - - char buf[64]; - int i; - const char *ptymajors = - "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ"; - const char *ptyminors = "0123456789abcdef"; - int num_minors = strlen(ptyminors); - int num_ptys = strlen(ptymajors) * num_minors; - - for (i = 0; i < num_ptys; i++) - { - snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors], - ptyminors[i % num_minors]); - *ptyfd = open(buf, O_RDWR|O_NOCTTY); - if (*ptyfd < 0) - continue; - snprintf(namebuf, sizeof buf, "/dev/tty%c%c", ptymajors[i / num_minors], - ptyminors[i % num_minors]); - - /* Open the slave side. */ - *ttyfd = open(namebuf, O_RDWR|O_NOCTTY); - if (*ttyfd < 0) - { - error("%.100s: %.100s", namebuf, strerror(errno)); - close(*ptyfd); - return 0; + /* BSD-style pty code. */ + char buf[64]; + int i; + const char *ptymajors = + "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ"; + const char *ptyminors = "0123456789abcdef"; + int num_minors = strlen(ptyminors); + int num_ptys = strlen(ptymajors) * num_minors; + + for (i = 0; i < num_ptys; i++) { + snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors], + ptyminors[i % num_minors]); + *ptyfd = open(buf, O_RDWR | O_NOCTTY); + if (*ptyfd < 0) + continue; + snprintf(namebuf, sizeof buf, "/dev/tty%c%c", ptymajors[i / num_minors], + ptyminors[i % num_minors]); + + /* Open the slave side. */ + *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); + if (*ttyfd < 0) { + error("%.100s: %.100s", namebuf, strerror(errno)); + close(*ptyfd); + return 0; + } + return 1; } - return 1; - } - return 0; + return 0; #endif /* HAVE_DEV_PTS_AND_PTC */ #endif /* HAVE_DEV_PTMX */ #endif /* HAVE__GETPTY */ #endif /* HAVE_OPENPTY */ } -/* Releases the tty. Its ownership is returned to root, and permissions to - 0666. */ +/* Releases the tty. Its ownership is returned to root, and permissions to 0666. */ -void pty_release(const char *ttyname) +void +pty_release(const char *ttyname) { - if (chown(ttyname, (uid_t)0, (gid_t)0) < 0) - debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno)); - if (chmod(ttyname, (mode_t)0666) < 0) - debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno)); + if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0) + debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno)); + if (chmod(ttyname, (mode_t) 0666) < 0) + debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno)); } /* Makes the tty the processes controlling tty and sets it to sane modes. */ -void pty_make_controlling_tty(int *ttyfd, const char *ttyname) +void +pty_make_controlling_tty(int *ttyfd, const char *ttyname) { - int fd; + int fd; - /* First disconnect from the old controlling tty. */ + /* First disconnect from the old controlling tty. */ #ifdef TIOCNOTTY - fd = open("/dev/tty", O_RDWR|O_NOCTTY); - if (fd >= 0) - { - (void)ioctl(fd, TIOCNOTTY, NULL); - close(fd); - } + fd = open("/dev/tty", O_RDWR | O_NOCTTY); + if (fd >= 0) { + (void) ioctl(fd, TIOCNOTTY, NULL); + close(fd); + } #endif /* TIOCNOTTY */ - if (setsid() < 0) - error("setsid: %.100s", strerror(errno)); - - /* Verify that we are successfully disconnected from the controlling tty. */ - fd = open("/dev/tty", O_RDWR|O_NOCTTY); - if (fd >= 0) - { - error("Failed to disconnect from controlling tty."); - close(fd); - } - - /* Make it our controlling tty. */ + if (setsid() < 0) + error("setsid: %.100s", strerror(errno)); + + /* Verify that we are successfully disconnected from the + controlling tty. */ + fd = open("/dev/tty", O_RDWR | O_NOCTTY); + if (fd >= 0) { + error("Failed to disconnect from controlling tty."); + close(fd); + } + /* Make it our controlling tty. */ #ifdef TIOCSCTTY - debug("Setting controlling tty using TIOCSCTTY."); - /* We ignore errors from this, because HPSUX defines TIOCSCTTY, but returns - EINVAL with these arguments, and there is absolutely no documentation. */ - ioctl(*ttyfd, TIOCSCTTY, NULL); + debug("Setting controlling tty using TIOCSCTTY."); + /* We ignore errors from this, because HPSUX defines TIOCSCTTY, + but returns EINVAL with these arguments, and there is + absolutely no documentation. */ + ioctl(*ttyfd, TIOCSCTTY, NULL); #endif /* TIOCSCTTY */ - fd = open(ttyname, O_RDWR); - if (fd < 0) - error("%.100s: %.100s", ttyname, strerror(errno)); - else - close(fd); - - /* Verify that we now have a controlling tty. */ - fd = open("/dev/tty", O_WRONLY); - if (fd < 0) - error("open /dev/tty failed - could not set controlling tty: %.100s", - strerror(errno)); - else - { - close(fd); - } + fd = open(ttyname, O_RDWR); + if (fd < 0) + error("%.100s: %.100s", ttyname, strerror(errno)); + else + close(fd); + + /* Verify that we now have a controlling tty. */ + fd = open("/dev/tty", O_WRONLY); + if (fd < 0) + error("open /dev/tty failed - could not set controlling tty: %.100s", + strerror(errno)); + else { + close(fd); + } } /* Changes the window size associated with the pty. */ -void pty_change_window_size(int ptyfd, int row, int col, - int xpixel, int ypixel) +void +pty_change_window_size(int ptyfd, int row, int col, + int xpixel, int ypixel) { - struct winsize w; - w.ws_row = row; - w.ws_col = col; - w.ws_xpixel = xpixel; - w.ws_ypixel = ypixel; - (void)ioctl(ptyfd, TIOCSWINSZ, &w); + struct winsize w; + w.ws_row = row; + w.ws_col = col; + w.ws_xpixel = xpixel; + w.ws_ypixel = ypixel; + (void) ioctl(ptyfd, TIOCSWINSZ, &w); } - |