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/***************************************************************************
*
* $Header: /usr/local/cvsroot/utils/ytree/quit.c,v 1.13 2003/03/16 13:13:29 werner Exp $
*
* Verlassen von ytree
*
*
***************************************************************************/
#include "ytree.h"
/*
quit-to-directory (xtree: alt-Q)(ytree: shift-Q, ^Q)
this uses the Ztree method.
for this to work, a ytree is called via a function in ~/.bashrc
instead of directly. that function generates a pid-unique
file containing a "cd cwd" line before calling ytree, and
sources-in the pid-unique file afterward, thus jumping to the
directory specified.
if ytree rewrites that file to the quit-to dir, the eventual
command-prompt will be in that chosen dir.
thus, a Quit exit jumps to the dir it's already in. a QuitTo
exit jumps to the dir_entry-specified dir.
QuitTo:
- get parent's pid
- get owning uid's homedir
- compose shell stub name
- test:
- exists?
- regular file?
- non-zero length?
- write dir_entry to it, thus replacing the starting-cwd line
- chain to Quit
if user elects not to quit, no harm done:
- rewrite that file to starting-cwd if it passes those checks again
(avoiding race opening vuln)
- return to main program loop
a user can have a bunch of ytrees open, but they'll be run one-per-
shell (i.e. each xterm singletasking) unless the user's ASKING for
trouble, so a given shell-pid will be unique for the xterm that
owns it, even though they're all clustered in the user's homedir.
changes:
- ytree.h add prototype for QuitTo
- filewin.c add call to QuitTo, for Q and ^Q
- dirwin.c add call to QuitTo, for Q and ^Q (q still falls to main)
i've mapped this to ^Q for now on my home machine, but it's probably best to
use just SHIFT-Q for this, following the trend of mapping XtreeGold
Alt-commands to SHIFT-commands in ytree/xtc. that leaves ytree usable in
serial terminals with soft (XOFF/XON) line control protocol.
in .bashrc:
#
# "yt" is part of getting ytree to quit to the target directory rather
# than the starting one (Alt-Q rather than Q, in XTG terms).
# the pid-numbered chdir "bat" will get rewritten to the selected
# dir if ytree is Quit or ^Quit rather than quit, if ytree-1.75b
# (or later version, assuming Werner incorporates my changes) is used.
# This method is based on Kim Henkel's alt-Q batfile method for ZtreeWin.
# --crb3 14jan00/12mar03
#
function yt
{
echo cd $PWD >~/.ytree-$$.chdir
/usr/bin/ytree $1 $2 $3 $4 $5
source ~/.ytree-$$.chdir
rm ~/.ytree-$$.chdir
}
*/
#define MAXPATH (PATH_LENGTH+1)
static int QuitFileCheck(char *fname);
void QuitTo(DirEntry * dir_entry)
{
int parpid;
FILE *qfile;
char nbuf[MAXPATH],qfilename[MAXPATH];
struct passwd *pwp;
GetPath(dir_entry,nbuf);
parpid=getppid();
pwp=getpwuid(getuid());
sprintf(qfilename,"%s/.ytree-%d.chdir",pwp->pw_dir,parpid);
if(!QuitFileCheck(qfilename)){
if( (qfile=fopen(qfilename,"w"))!=NULL)
{
fprintf(qfile,"cd %s\n",nbuf);
fclose(qfile);
}
}
Quit(); /* never come back from a successful quit */
if(!QuitFileCheck(qfilename)){
if( (qfile=fopen(qfilename,"w"))!=NULL)
{
fprintf(qfile,"cd %s\n",Getcwd(NULL,0));
fclose(qfile);
}
}
}
/*
* QuitFileCheck.
* quick safety-check of the shell stub we want to write to.
* if any of these tests fail, somebody's trying to use us for a
* security breach.
*/
static int QuitFileCheck(char *fname)
{
struct stat fstat;
if(stat(fname,&fstat))
return(1);
if(!S_ISREG(fstat.st_mode))
return(1);
if(!fstat.st_size)
return(2);
if(fstat.st_uid != getuid())
return(3);
return(0);
}
void Quit(void)
{
int term;
char path[PATH_LENGTH + 1];
char *p;
term = InputChoise( "quit ytree (Y/N) ?", "YNQq\r\033" );
if( term == 'Y' || term == 'Q' || term == 'q' )
{
if (( p = getenv("HOME") ))
{
sprintf(path, "%s%c%s", p, FILE_SEPARATOR_CHAR, HISTORY_FILENAME);
SaveHistory(path);
}
endwin();
#ifdef XCURSES
XCursesExit();
#endif
exit( 0 );
}
}
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