I could be wrong, but it appears that the configuration time detection of how
to access pseudo terminals is broken, at least for CentOS 6. I noticed this
when testing vtun-3.0.3-1.el6.x86_64.rpm (from the vtun download page) ...
things where failing because vtun was trying to access "/dev/ptyXY" devices,
rather than using getpt()/grantpt()/unlockpt()/ptsname(). CentOS 6 does not
have "/dev/ptyXY" devices, but I could get CentOS 6 happily using
getpt()/grantpt()/unlockpt()/ptsname() to return "/dev/pts/XY" names.
[You can see this behaviour if you try to use the "sz" session that comes in
the distribution's vtund.conf, a trace of the server session showing it trying
to open "/dev/ptyp0" to "/dev/ptyzv"]
I pulled down the latest sources, vtun-3.0.3.tar.gz, and tried a ./configure,
make, ... as far as I can see configure sees that
getpt()/grantpt()/unlockpt()/ptsname() are available ...
> # /configure
> ...
> checking for getpt... yes
> checking for grantpt... yes
> checking for unlockpt... yes
> checking for ptsname... yes
> ...
> configure: creating ./config.status
> config.status: creating Makefile
> config.status: creating config.h
but config.h does not have HAVE_GETPT / HAVE_GRANTPT / HAVE_PTSNAME /
HAVE_UNLOCKPT defined in it, nor do any other .h files ...
> # egrep -r 'HAVE_GETPT|HAVE_GRANTPT|HAVE_UNLOCKPT|HAVE_PTSNAME' *.h
nothing is found.
However pty_dev.c / pty_open() needs all the 4 HAVE_* values defined before it
will use getpt()/grantpt()/unlockpt()/ptsname() ...
> ...
> int pty_open(char *sl_name)
> {
> int mr_fd;
> #if defined (HAVE_GETPT) && defined (HAVE_GRANTPT) && defined
>(HAVE_UNLOCKPT) && defined (HAVE_PTSNAME)
> char *ptyname;
>
> if((mr_fd=getpt()) < 0)
> return -1;
> ...
The make/compile of pty_dev.c shows ...
> gcc -g -O2 -I/usr/include/lzo -I/usr/include/openssl -I/usr/include/openssl
>-I/usr/include/openssl \
> -I/usr/include/openssl
>-DVTUN_CONFIG_FILE=\"/usr/local/etc/vtund.conf\" \
> -DVTUN_PID_FILE=\"/usr/local/var/run/vtund.pid\"
>-DVTUN_STAT_DIR=\"/usr/local/var/log/vtund\" \
> -DVTUN_LOCK_DIR=\"/usr/local/var/lock/vtund\" \
> -c pty_dev.c
so no -DHAVE_* are passed to the compile either.
config.log does have the defines ...
> # egrep 'HAVE_GETPT|HAVE_GRANTPT|HAVE_UNLOCKPT|HAVE_PTSNAME' config.log
> #define HAVE_GETPT 1
> #define HAVE_GRANTPT 1
> #define HAVE_PTSNAME 1
> #define HAVE_UNLOCKPT 1
Am I misunderstanding how this should be working, or is there a bug?
For completeness, here is a test program using
getpt()/grantpt()/unlockpt()/ptsname() that did work under CentOS 6.2 ...
> #include <stdio.h>
> #define _XOPEN_SOURCE
> #define __USE_XOPEN
> #include <stdlib.h>
>
> main()
> {
> int mr_fd;
> char *ptyname;
>
> if((mr_fd=getpt()) < 0)
> return -1;
> if(grantpt(mr_fd) != 0)
> return -1;
> if(unlockpt(mr_fd) != 0)
> return -1;
> if ((ptyname = (char *) ptsname(mr_fd)) == NULL)
> return -1;
> printf( "<%s>\n" , ptyname );
> exit( 0 );
> }
Max
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