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Top Forums Shell Programming and Scripting Extracting relevant information from syslogs. Post 302699653 by lewk on Wednesday 12th of September 2012 06:18:33 AM
Old 09-12-2012
Extracting relevant information from syslogs.

I need to analyse some syslogs and I want to print out all the lines containing SSH connections to the inside interface of the firewall and ignore lines where the originating port is 22. So basically I want to print all matches after "to inside:" that contains /22 and ignore lines where /22 occur before "to inside:"

Before:

Code:
Teardown TCP connection 1595221765 for outside:10.35.22.20/22 to inside:10.33.249.82/1373 duration 0:25:10 bytes 119889 TCP FINs
Teardown TCP connection 1596165459 for outside:10.94.27.204/22 to inside:10.35.249.82/1558 duration 0:25:09 bytes 316401 TCP FINs
Teardown TCP connection 1597641639 for outside:123.32.168.219/10365 to inside:10.88.38.232/22 duration 0:00:30 bytes 0 SYN Timeout
Teardown TCP connection 1598227499 for outside:10.40.223.47/22 to inside:10.77.68.82/1804 duration 1:08:48 bytes 42429 TCP FINs
Teardown TCP connection 1597660611 for outside:10.93.226.150/22 to inside:10.43.249.82/1761 duration 1:31:26 bytes 25733 TCP FINs
Teardown TCP connection 1605038930 for outside:103.33.241.216/12995 to inside:10.5.36.232/22 duration 0:00:30 bytes 0 SYN Timeout

After:

Code:
Teardown TCP connection 1597641639 for outside:123.32.168.219/10365 to inside:10.88.38.232/22 duration 0:00:30 bytes 0 SYN Timeout
Teardown TCP connection 1605038930 for outside:103.33.241.216/12995 to inside:10.5.36.232/22 duration 0:00:30 bytes 0 SYN Timeout

 

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libssh2_channel_forward_listen_ex(3)				  libssh2 manual			      libssh2_channel_forward_listen_ex(3)

NAME
libssh2_channel_forward_listen_ex - listen to inbound connections SYNOPSIS
#include <libssh2.h> LIBSSH2_LISTENER * libssh2_channel_forward_listen_ex(LIBSSH2_SESSION *session, char *host, int port, int *bound_port, int queue_maxsize); LIBSSH2_LISTENER * libssh2_channel_forward_listen(LIBSSH2_SESSION *session, int port); DESCRIPTION
Instruct the remote SSH server to begin listening for inbound TCP/IP connections. New connections will be queued by the library until accepted by libssh2_channel_forward_accept(3). session - instance as returned by libssh2_session_init(). host - specific address to bind to on the remote host. Binding to 0.0.0.0 (default when NULL is passed) will bind to all available addresses. port - port to bind to on the remote host. When 0 is passed, the remote host will select the first available dynamic port. bound_port - Populated with the actual port bound on the remote host. Useful when requesting dynamic port numbers. queue_maxsize - Maximum number of pending connections to queue before rejecting further attempts. libssh2_channel_forward_listen(3) is a macro. RETURN VALUE
A newly allocated LIBSSH2_LISTENER instance or NULL on failure. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_PROTO - An invalid SSH protocol response was received on the socket. LIBSSH2_ERROR_REQUEST_DENIED - The remote server refused the request. LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block. SEE ALSO
libssh2_channel_forward_accept(3) libssh2 0.15 1 Jun 2007 libssh2_channel_forward_listen_ex(3)
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