search for: ssh2_msg_channel_data

Hi, I'm currently working on an FTP utility which contains SSH2/Port Forwarding functionality. I'm having a problem with receiving large amounts of data. When I open my forwarding channel, I give it a Window Size, say about 10K. When I try to download a file through the forwarded FTP channel, the SSH2 server (VShell in this case) is only sending over 10K. Apparently the server will only

...h the code of open ssh server part ( code for sshd ). My query is when user gives any command ( for example unix command "ls") in the console ( after ssh login is complete ), which function in sshd will execute this command. I traced that the command is coming to sshd code in message type SSH2_MSG_CHANNEL_DATA. There is a check using function packet_check_eom(). But I am not able to trace the place where linux command "ls" will be executed. I want to know the function in sshd code which will execute this function. Hoping for your expertise in this regard. Kindly help. Best regards, Titu

...yield better results, on the ground that SSH will try to cram as much data as possible in a channel data message, within the limitations imposed by the maximum SSH message size and the current window size. On the other hand, rsync might (and 'might' is the keyword here) resort to individual SSH2_MSG_CHANNEL_DATA messages for particular deltas, thus giving the compression code smaller amounts of data to play with every time. Additionally, SSH compression will be able to compress the rsync protocol control data, which rsync will not be able to compress (right?) Feedback on the issues above will be much appr...

Hi, protocolkeepalives sends ssh_msg_ignore, which the ssh2 server handles incorrectly (i.e. it produces some output to syslog, instead of ignoring the packet): Jul 9 11:58:07 ren sshd[16580]: error: Hm, dispatch protocol error: type 32 plen 4 This patch implements a highly advanced function to ignore these packets ;) Matthew -------------- next part -------------- An embedded and

...if (len > packet_get_maxsize()/ 2) len = packet_get_maxsize()/2; } } if (len > 0) { packet_start(compat20 ? SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); packet_put_int(c->remote_id); packet_put_string(buffer_ptr(&c- >input), len); packet_send(); buffer_consume(&c->input, len);...

...SSH will try to cram as much data as possible in a > channel data message, within the limitations imposed by the maximum SSH > message size and the current window size. On the other hand, rsync > might > (and 'might' is the keyword here) resort to individual > SSH2_MSG_CHANNEL_DATA messages for particular deltas, thus giving the > compression code smaller amounts of data to play with every time. > Additionally, SSH compression will be able to compress the rsync > protocol > control data, which rsync will not be able to compress (right?) > > F...

I am utilizing an openssh tunnel between two Linux boxes. On the client box I issue the following commands to set up the tunnel; - ssh -w0:0 root at x.x.x.x -v where x.x.x.x is the IP address of the Linux system running sshd - ip addr add 10.0.5.1/32 peer 10.0.5.2 dev tun0 - ip link set tun0 up On the box running sshd I issue the following commands: - ip addr add 10.0.5.2/32 peer 10.0.5.1 dev

...return; + + /* The following packets reset idletimeout on input or output. + * Note that only actual data resets idletimeout, control packets + * do not. */ + switch(type) { + case SSH_MSG_CHANNEL_DATA: + case SSH_CMSG_STDIN_DATA: + case SSH_SMSG_STDOUT_DATA: + case SSH_SMSG_STDERR_DATA: + case SSH2_MSG_CHANNEL_DATA: + case SSH2_MSG_CHANNEL_EXTENDED_DATA: + time(&idletime_last); + } +} + +int +packet_select(int maxfds, + fd_set *readset, fd_set *writeset, fd_set *exceptset, + int max_time_milliseconds) +{ + struct timeval tv, *tvp=NULL; + int ret; + + if (idletimeout>0) { +...

I'm reading this fine article on O'Reilly: http://linux.oreillynet.com/lpt/a//linux/2001/11/08/ssh_keystroke.html <quote> The paper concludes that the keystroke timing data observable from today's SSH implementations reveals a dangerously significant amount of information about user terminal sessions--enough to locate typed passwords in the session data stream and reduce the

...ents bogus_send_count and use_steno_timing_manipulation + * to channel_output_poll. +*/ void -channel_output_poll() +channel_output_poll(int *bogus_send_count, int use_steno_timing_manipulation) { int len, i; Channel *c; @@ -1649,11 +1678,49 @@ SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); packet_put_int(c->remote_id); packet_put_string(buffer_ptr(&c->input), len); + /* + * Begin SD Mod: if using SSH2 and it is +...

I am running OpenSSH 2.9p1 on SunOS 5.7 w/4-24-2001 patch cluster. Like many other users I am seeing the hanging session on logout with background processes. This is a huge problem for me as I centrally manage 50+ machines with rdist across ssh. Instead of just complaining about the problem I thought I would put my CS degree to use and try to track down the problem myself. For starters,

Hello, In response to the timing analysis attacks presented by Dawn Song et. al. in her paper http://paris.cs.berkeley.edu/~dawnsong/ssh-timing.html we at Silicon Defense developed a patch for openssh to avoid such measures. Timing Analysis Evasion changes were developed by C. Jason Coit and Roel Jonkman of Silicon Defense. These changes cause SSH to send packets unless request not to,

...ifdef CHARSET_EBCDIC + xfree(ucp); +#endif } diff -bur openssh-3.7.1p2.orig/channels.c openssh-3.7.1p2/channels.c --- openssh-3.7.1p2.orig/channels.c Tue Sep 16 23:34:12 2003 +++ openssh-3.7.1p2/channels.c Tue Oct 7 08:22:00 2003 @@ -1752,7 +1752,11 @@ packet_start(compat20 ? SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); packet_put_int(c->remote_id); + /*if (strcmp(c->ctype, "session") == 0)*/ + if (c->ctype[0] == 's') packet_put_string(buffer_ptr(&c->input), len); + else + packet_put_binary(buffer_ptr(&c->input), len);...