Re: instability

["jeetu.golani@xxxxxxxxx" <jeetu.golani@xxxxxxxxx>]

Hi Aris,


> If you are using server support, I strongly recommend that you use
> libssh 0.5rc1, in which we fixed many bugs for servers. In that case,
> please read http://api.libssh.org/master/libssh_tutor_threads.html for
> more info on threading.
>
>
I'm using the current libssh in master, will go through the documentation :)
thanks a lot :)

Bye for now



> Kr,
>
> Aris
>
> Le 24/05/11 05:47, jeetu.golani@xxxxxxxxx a écrit :
> > Hi Aris,
> >
> >>With libssh 0.5, it's a little different, you have to initialize libssh
> > threads and call ssh_init(). (libssh does the dirty work of
> > initilalizing >libcrypto or libgcrypt).
> >
> > Just want to clarify if what I'm doing for my libssh server is all
> > right. In principle I have a new ssh_session created for each new
> > connection into the server.
> >
> > My ssh_bind is common for all threads and I call ssh_bind_listen. I have
> > a ssh_session *session (therefore session is a pointer to a pointer) and
> > I init this pointer first with an session = ssh_new().....I then move
> > into a loop where I init an individual session element  such as
> > session[session_count] = ssh_new and then move onto waiting to accept a
> > connection with a ssh_bind_option...authenticating user...and finally if
> > authenticated create a new glib thread for that server
> > session....incremenet session_count.... and this loops.
> >
> > Sorry for trying to describe code instead of pasting the relevant
> > snippet here but I don't have access to my comp with the code right now.
> >
> > Does the above seem in principle to be acceptable and in line with
> > libssh's threading model....or would ppl recommend a better way to have
> > a multi-threaded server.
> >
> > Thanks,
> >
> > Bye
> >
> >
> > On Tue, May 24, 2011 at 2:54 AM, Paulo Panhoto <paulo.panhoto@xxxxxxxxx
> > <mailto:paulo.panhoto@xxxxxxxxx>> wrote:
> >
> >     There are several threads running but each session is only accessed
> >     by one thread.
> >
> >     Sure, it does help. thanks.
> >
> >
> >     On Mon, May 23, 2011 at 6:22 PM, Aris Adamantiadis
> >     <aris@xxxxxxxxxxxx <mailto:aris@xxxxxxxxxxxx>> wrote:
> >
> >         Hi Paulo,
> >
> >         Are you using libssh in several threads ? Libssh is threadsafe
> >         under two conditions : call ssh_init() outside of threads and
> >         initialize threading in the crypto library
> >         (http://www.openssl.org/support/faq.html#PROG1).
> >         With libssh 0.5, it's a little different, you have to initialize
> >         libssh threads and call ssh_init(). (libssh does the dirty work
> >         of initilalizing libcrypto or libgcrypt).
> >
> >         Hope this helps,
> >
> >         Aris
> >
> >         Le 23/05/11 21:41, Paulo Panhoto a écrit :
> >
> >             Hello,
> >
> >             I'm writing a Qt app with libssh. The best approach I've got
> >             was this:
> >             wrap ssh in a QThread that emits signals to other components.
> >
> >
> >                     session = ssh_new();
> >
> >                     if (session == NULL)
> >                     {
> >                         throw SSHException(tr("ssh_new failed"));
> >                     }
> >                     const std::string & stdHost = host.toStdString();
> >                     ssh_options_set(session, SSH_OPTIONS_HOST,
> >             stdHost.c_str());
> >                     ssh_options_set(session, SSH_OPTIONS_PORT, &port);
> >                     ssh_options_set(session, SSH_OPTIONS_SSH1,
> &disabled);
> >                     ssh_options_set(session, SSH_OPTIONS_SSH2, &enabled);
> >
> >                     emit stateChanged(CONNECTING);
> >                     emit debugInfo(tr("Conecting to
> >             %0:%1").arg(host).arg(port));
> >                     if (ssh_connect(session) != SSH_OK)
> >                     {
> >                         throw SSHException(QString("ssh_connect:
> >             %1").arg(ssh_get_error(session)));
> >                     }
> >
> >             This piece of code is causing me trouble: I'm running it on
> >             a opensuse
> >             11.3 and tested it with libssh 0.4.2 (the "branding"
> >             release) and 0.4.8.
> >
> >             When I compile it against OpenSSL, I get aborts due to
> >             double free
> >             inside libcrypto: works most of the time when I run it
> natively.
> >             Nevertheless, when the program is run via xming server, the
> >             error rate
> >             is almost 100%
> >             libopenssl 1.0.0-6.7.1 - x86_64
> >
> >             #0  0x00007ffff5aca9e5 in raise () from /lib64/libc.so.6
> >             #1  0x00007ffff5acbee6 in abort () from /lib64/libc.so.6
> >             #2  0x00007ffff5b05c53 in __libc_message () from
> >             /lib64/libc.so.6
> >             #3  0x00007ffff5b0b226 in malloc_printerr () from
> >             /lib64/libc.so.6
> >             #4  0x00007ffff5b0e8e3 in _int_realloc () from
> /lib64/libc.so.6
> >             #5  0x00007ffff5b10142 in realloc () from /lib64/libc.so.6
> >             #6  0x00007ffff4ca6d4f in CRYPTO_realloc () from
> >             /lib64/libcrypto.so.1.0.0
> >             #7  0x00007ffff4d0d2a8 in lh_insert () from
> >             /lib64/libcrypto.so.1.0.0
> >             #8  0x00007ffff4ca980c in OBJ_NAME_add () from
> >             /lib64/libcrypto.so.1.0.0
> >             #9  0x00007ffff4d1a66b in OpenSSL_add_all_digests () from
> >             /lib64/libcrypto.so.1.0.0
> >             #10 0x00007ffff7bac3cc in ssh_crypto_init () at
> >             /home/paulo/Downloads/oss-src/libssh-0.4.8/libssh/dh.c:144
> >             #11 0x00007ffff7bae8f1 in ssh_init () at
> >             /home/paulo/Downloads/oss-src/libssh-0.4.8/libssh/init.c:47
> >             #12 0x00007ffff7ba929c in ssh_connect (session=0xc3b8e0)
> >
> >             If I compile it against libgcrypt, it fails all the time due
> >             to an
> >             assertion failure --  ath.c:193: _gcry_ath_mutex_lock:
> >             Assertion `*lock
> >             == ((ath_mutex_t) 0)' failed.
> >             libgcrypt  1.4.4-6.1 - x86-64
> >
> >             #0  0x00007ffff5ac79e5 in raise () from /lib64/libc.so.6
> >             #1  0x00007ffff5ac8ee6 in abort () from /lib64/libc.so.6
> >             #2  0x00007ffff4fdcaa8 in ?? () from /lib64/libgcrypt.so.11
> >             #3  0x00007ffff4fdd1c7 in ?? () from /lib64/libgcrypt.so.11
> >             #4  0x00007ffff4fd75f6 in ?? () from /lib64/libgcrypt.so.11
> >             #5  0x00007ffff4fd7792 in ?? () from /lib64/libgcrypt.so.11
> >             #6  0x00007ffff7ba8f7b in ssh_crypto_init ()
> >                 at
> >             /home/paulo/Downloads/oss-src/libssh-0.4.8/libssh/dh.c:115
> >             #7  0x00007ffff7bab961 in ssh_init ()
> >                 at
> >             /home/paulo/Downloads/oss-src/libssh-0.4.8/libssh/init.c:47
> >             #8  0x00007ffff7ba5ebc in ssh_connect (session=0xccf260)
> >                 at
> >
> /home/paulo/Downloads/oss-src/libssh-0.4.8/libssh/client.c:516
> >
> >             Am I missing any steps?? Is openSSL the best library to
> >             compile with??
> >
> >             Any idea is appreciated.
> >
> >             Regards,
> >
> >             Paulo.
> >
> >
> >
> >
>
>