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386 lines
10 KiB
386 lines
10 KiB
/***************************************************************************
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begin : Mon Sep 13 1999
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copyright : (C) 1999 by John Birch
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email : jbb@tdevelop.org
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This code was originally written by Judin Maxim, from the
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KDEStudio project.
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It was then updated with later code from konsole (KDE).
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It has also been enhanced with an idea from the code in kdbg
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written by Johannes Sixt<Johannes.Sixt@telecom.at>
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef __osf__
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#define _XOPEN_SOURCE_EXTENDED
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#define O_NDELAY O_NONBLOCK
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#endif
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#ifdef HAVE_SYS_STROPTS_H
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#include <sys/stropts.h>
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#define _NEW_TTY_CTRL
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#endif
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#include <assert.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <errno.h>
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#if defined (_HPUX_SOURCE)
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#define _TERMIOS_INCLUDED
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#include <bsdtty.h>
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#endif
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#include <tqintdict.h>
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#include <tqsocketnotifier.h>
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#include <tqstring.h>
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#include <tqfile.h>
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#include <klocale.h>
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#include <kstandarddirs.h>
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#include <kapplication.h>
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#include "stty.h"
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#define PTY_FILENO 3
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#define BASE_CHOWN "konsole_grantpty"
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namespace GDBDebugger
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{
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static int chownpty(int fd, int grant)
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// param fd: the fd of a master pty.
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// param grant: 1 to grant, 0 to revoke
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// returns 1 on success 0 on fail
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{
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void(*tmp)(int) = signal(SIGCHLD,SIG_DFL);
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pid_t pid = fork();
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if (pid < 0) {
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signal(SIGCHLD,tmp);
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return 0;
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}
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if (pid == 0) {
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/* We pass the master pseudo terminal as file descriptor PTY_FILENO. */
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if (fd != PTY_FILENO && dup2(fd, PTY_FILENO) < 0)
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::exit(1);
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TQString path = locate("exe", BASE_CHOWN);
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execle(TQFile::encodeName(path), BASE_CHOWN, grant?"--grant":"--revoke", (void *)0, NULL);
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::exit(1); // should not be reached
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}
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if (pid > 0) {
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int w;
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// retry:
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int rc = waitpid (pid, &w, 0);
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if (rc != pid)
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::exit(1);
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// { // signal from other child, behave like catchChild.
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// // guess this gives quite some control chaos...
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// Shell* sh = shells.find(rc);
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// if (sh) { shells.remove(rc); sh->doneShell(w); }
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// goto retry;
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// }
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signal(SIGCHLD,tmp);
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return (rc != -1 && WIFEXITED(w) && WEXITSTATUS(w) == 0);
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}
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signal(SIGCHLD,tmp);
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return 0; //dummy.
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}
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// **************************************************************************
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STTY::STTY(bool ext, const TQString &termAppName)
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: TQObject(),
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out(0),
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ttySlave(""),
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pid_(0),
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external_(ext)
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{
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if (ext) {
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findExternalTTY(termAppName);
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} else {
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fout = findTTY();
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if (fout >= 0) {
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ttySlave = TQString(tty_slave);
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out = new TQSocketNotifier(fout, TQSocketNotifier::Read, this);
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connect( out, TQT_SIGNAL(activated(int)), this, TQT_SLOT(OutReceived(int)) );
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}
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}
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}
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// **************************************************************************
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STTY::~STTY()
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{
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if (pid_)
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::kill(pid_, SIGTERM);
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if (out) {
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::close(fout);
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delete out;
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}
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}
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// **************************************************************************
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int STTY::findTTY()
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{
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int ptyfd = -1;
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bool needGrantPty = TRUE;
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// Find a master pty that we can open ////////////////////////////////
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#ifdef __sgi__
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ptyfd = open("/dev/ptmx",O_RDWR);
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if (ptyfd < 0) {
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perror("Can't open a pseudo teletype");
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return(-1);
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}
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strncpy(tty_slave, ptsname(ptyfd), 50);
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grantpt(ptyfd);
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unlockpt(ptyfd);
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needGrantPty = FALSE;
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#endif
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// first we try UNIX PTY's
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#ifdef TIOCGPTN
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strcpy(pty_master,"/dev/ptmx");
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strcpy(tty_slave,"/dev/pts/");
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ptyfd = open(pty_master,O_RDWR);
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if (ptyfd >= 0) { // got the master pty
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int ptyno;
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if (ioctl(ptyfd, TIOCGPTN, &ptyno) == 0) {
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struct stat sbuf;
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sprintf(tty_slave,"/dev/pts/%d",ptyno);
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if (stat(tty_slave,&sbuf) == 0 && S_ISCHR(sbuf.st_mode))
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needGrantPty = FALSE;
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else {
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close(ptyfd);
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ptyfd = -1;
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}
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} else {
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close(ptyfd);
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ptyfd = -1;
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}
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}
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#endif
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#if defined(_SCO_DS) || defined(__USLC__) /* SCO OSr5 and UnixWare */
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if (ptyfd < 0) {
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for (int idx = 0; idx < 256; idx++)
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{ sprintf(pty_master, "/dev/ptyp%d", idx);
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sprintf(tty_slave, "/dev/ttyp%d", idx);
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if (access(tty_slave, F_OK) < 0) { idx = 256; break; }
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if ((ptyfd = open (pty_master, O_RDWR)) >= 0)
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{ if (access (tty_slave, R_OK|W_OK) == 0) break;
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close(ptyfd); ptyfd = -1;
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}
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}
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}
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#endif
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if (ptyfd < 0) { /// \FIXME Linux, Trouble on other systems?
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for (const char* s3 = "pqrstuvwxyzabcde"; *s3 != 0; s3++) {
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for (const char* s4 = "0123456789abcdef"; *s4 != 0; s4++) {
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sprintf(pty_master,"/dev/pty%c%c",*s3,*s4);
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sprintf(tty_slave,"/dev/tty%c%c",*s3,*s4);
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if ((ptyfd = open(pty_master, O_RDWR)) >= 0) {
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if (geteuid() == 0 || access(tty_slave, R_OK|W_OK) == 0)
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break;
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close(ptyfd);
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ptyfd = -1;
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}
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}
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if (ptyfd >= 0)
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break;
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}
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}
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if (ptyfd >= 0) {
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if (needGrantPty && !chownpty(ptyfd, TRUE)) {
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fprintf(stderr,"tdevelop: chownpty failed for device %s::%s.\n",pty_master,tty_slave);
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fprintf(stderr," : This means the session can be eavesdroped.\n");
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fprintf(stderr," : Make sure konsole_grantpty is installed and setuid root.\n");
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}
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::fcntl(ptyfd, F_SETFL, O_NDELAY);
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#ifdef TIOCSPTLCK
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int flag = 0;
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ioctl(ptyfd, TIOCSPTLCK, &flag); // unlock pty
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#endif
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}
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return ptyfd;
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}
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// **************************************************************************
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void STTY::OutReceived(int f)
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{
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char buf[1024];
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int n;
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// read until socket is empty. We shouldn't be receiving a continuous
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// stream of data, so the loop is unlikely to cause problems.
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while ((n = ::read(f, buf, sizeof(buf)-1)) > 0) {
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*(buf+n) = 0; // a standard string
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emit OutOutput(buf);
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}
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// Note: for some reason, n can be 0 here.
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// I can understand that non-blocking read returns 0,
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// but I don't understand how OutRecieved can be even
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// called when there's no input.
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if (n == 0 /* eof */
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|| (n == -1 && errno != EAGAIN))
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{
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// Found eof or error. Disable socket notifier, otherwise TQt
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// will repeatedly call this method, eating CPU
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// cycles.
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out->setEnabled(false);
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}
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}
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void STTY::readRemaining()
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{
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if (!external_)
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OutReceived(fout);
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}
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// **************************************************************************
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#define FIFO_FILE "/tmp/debug_tty.XXXXXX"
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bool STTY::findExternalTTY(const TQString &termApp)
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{
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TQString appName(termApp.isEmpty() ? TQString("xterm") : termApp);
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if ( KStandardDirs::findExe( termApp ).isEmpty() )
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{
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return false;
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}
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char fifo[] = FIFO_FILE;
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int fifo_fd;
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if ((fifo_fd = mkstemp(fifo)) == -1)
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return false;
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::close(fifo_fd);
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::unlink(fifo);
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// create a fifo that will pass in the tty name
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#ifdef HAVE_MKFIFO
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if (::mkfifo(fifo, S_IRUSR|S_IWUSR) < 0)
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#else
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if (::mknod(fifo, S_IFIFO | S_IRUSR|S_IWUSR, 0) < 0)
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#endif
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return false;
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int pid = ::fork();
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if (pid < 0) { // No process
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::unlink(fifo);
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return false;
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}
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if (pid == 0) { // child process
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/*
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* Spawn a console that in turn runs a shell script that passes us
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* back the terminal name and then only sits and waits.
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*/
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const char* prog = appName.latin1();
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TQString script = TQString("tty>") + TQString(fifo) +
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TQString(";" // fifo name
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"trap \"\" INT TQUIT TSTP;" // ignore various signals
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"exec<&-;exec>&-;" // close stdin and stdout
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"while :;do sleep 3600;done");
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const char* scriptStr = script.latin1();
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if ( termApp == "konsole" )
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{
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::execlp( prog, prog,
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"-caption", i18n("tdevelop: Debug application console").local8Bit().data(),
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"-e", "sh",
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"-c", scriptStr,
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NULL);
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}
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else
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{
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::execlp( prog, prog,
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"-e", "sh",
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"-c", scriptStr,
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NULL);
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}
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// Should not get here, as above should always work
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::exit(1);
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}
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// parent process
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if (pid <= 0)
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::exit(1);
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// Open the communication between us (the parent) and the
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// child (the process running on a tty console)
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fifo_fd = ::open(fifo, O_RDONLY);
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if (fifo_fd < 0)
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return false;
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// Get the ttyname from the fifo buffer that the child process
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// has sent.
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char ttyname[50];
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int n = ::read(fifo_fd, ttyname, sizeof(ttyname)-sizeof(char));
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::close(fifo_fd);
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::unlink(fifo);
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// No name??
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if (n <= 0)
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return false;
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// remove whitespace
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ttyname[n] = 0;
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if (char* newline = strchr(ttyname, '\n'))
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*newline = 0; // clobber the new line
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ttySlave = ttyname;
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pid_ = pid;
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return true;
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}
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}
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// **************************************************************************
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#include "stty.moc"
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