Bridge Proxy Overview
The Bridge Proxy included with the Sambar Server is a relatively
simple mechanism to map TCP traffic from one network to another.
See the Proxy Functionality for an overview
of the Bridge Proxy functionality.
Trace Bridge
The Bridge proxy listens to traffic destined for a specified TCP port
(i.e. 23) and then forward all requests to the same TCP port of the
Bridge Server specified in the config.ini file.
For example, to telnet from a machine on one side of the
Sambar Server to a remote machine on the other side of the "firewall",
you could use the Bridge Proxy to connect the session:
Trace Bridge = true
Bridge Port = 23
Act As Bridge Proxy = true
Bridge Server = dev2
With the above configuration, you would telnet to the machine on
which your Sambar Server is running and it would automatically forward
your request to the machine dev2. By setting the flag
Trace Bridge to true the log
file bridge.log will contain a trace of the bridge session.
This functionality is designed to assist in debugging client/server
applications.
The following is a bridge.log transcript from a bridge proxy
telnet session. The session consists of logging in, listing all files
on the Unix machine and then exiting the telnet session. Note: The byte
count numbering along the right-hand side restarts at 000000 for each
TCP/IP packet received.
[26/May/1998:13:42:13 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: FF FD 18 FF FD 1F FF FD : 23 FF FD 27 FF FD 24 .²..²..²#.²'.²$.
[26/May/1998:13:42:13 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: FF FB 18 : .√..............
000000: FF FC 1F FF FC 23 FF FC : 27 FF FC 24 .ⁿ..ⁿ#.ⁿ'.ⁿ$....
[26/May/1998:13:42:13 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: FF FE 1F FF FE 23 FF FE : 27 FF FE 24 FF FA 18 01 .■..■#.■'.■$....
000010: FF F0 : ................
[26/May/1998:13:42:13 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: FF FC 1F : .ⁿ..............
000000: FF FC 23 FF FC 27 FF FC : 24 FF FA 18 00 41 4E 53 .ⁿ#.ⁿ'.ⁿ$....ANS
000010: 49 FF F0 : I...............
[26/May/1998:13:42:13 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 0D 0A 0D 0A 55 4E 49 58 : 28 72 29 20 53 79 73 74 ....UNIX(r) Syst
000010: 65 6D 20 56 20 52 65 6C : 65 61 73 65 20 34 2E 30 em V Release 4.0
000020: 20 28 64 65 76 32 29 0D : 0A 0D 00 0D 0A 0D 00 (dev2).........
000000: FF FB 01 FF FB 03 FF FD : 01 6C 6F 67 69 6E 3A 20 .√..√..².login:
[26/May/1998:13:42:13 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: FF FD 01 : .²..............
000000: FF FD 03 FF FB 01 : .²..√...........
[26/May/1998:13:42:14 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: FF FB 01 FF FE 01 : .√..■...........
[26/May/1998:13:42:14 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: FF FC 01 : .ⁿ..............
000000: 6F : o...............
[26/May/1998:13:42:15 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 6F : o...............
[26/May/1998:13:42:15 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 72 : r...............
[26/May/1998:13:42:15 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 72 : r...............
[26/May/1998:13:42:15 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 61 : a...............
[26/May/1998:13:42:16 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 61 : a...............
[26/May/1998:13:42:16 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 63 : c...............
[26/May/1998:13:42:16 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 63 : c...............
[26/May/1998:13:42:16 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 6C : l...............
[26/May/1998:13:42:16 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 6C : l...............
[26/May/1998:13:42:16 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 65 : e...............
[26/May/1998:13:42:16 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 65 : e...............
[26/May/1998:13:42:16 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 37 : 7...............
[26/May/1998:13:42:17 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 37 : 7...............
[26/May/1998:13:42:18 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 0D 0A : ................
[26/May/1998:13:42:18 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 0D 0A : ................
000000: 50 61 73 73 77 6F 72 64 : 3A 20 Password: ......
[26/May/1998:13:42:20 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 61 : a...............
000000: 61 : a...............
000000: 61 : a...............
000000: 61 : a...............
000000: 61 : a...............
000000: 61 : a...............
000000: 61 : a...............
000000: 0D 0A : ................
[26/May/1998:13:42:21 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 0D 0A : ................
000000: 4C 61 73 74 20 6C 6F 67 : 69 6E 3A 20 54 75 65 20 Last login: Tue
000010: 4D 61 79 20 32 36 20 31 : 33 3A 33 34 3A 35 38 20 May 26 13:34:58
000020: 66 72 6F 6D 20 41 4C 4C : 41 4E 2E 69 63 61 72 69 from ALLAN.icari
000030: 61 6E 2E 63 6F 0D 0A : an.co...........
000000: 53 75 6E 20 4D 69 63 72 : 6F 73 79 73 74 65 6D 73 Sun Microsystems
000010: 20 49 6E 63 2E 20 20 20 : 53 75 6E 4F 53 20 35 2E Inc. SunOS 5.
000020: 35 2E 31 20 20 20 20 20 : 47 65 6E 65 72 69 63 20 5.1 Generic
000030: 4D 61 79 20 31 39 39 36 : 0D 0A May 1996........
000000: 25 20 : % ..............
[26/May/1998:13:42:23 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 6C : l...............
[26/May/1998:13:42:23 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 6C : l...............
[26/May/1998:13:42:23 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 73 : s...............
[26/May/1998:13:42:23 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 73 : s...............
[26/May/1998:13:42:24 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 0D 0A : ................
[26/May/1998:13:42:24 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 0D 00 0D 0A : ................
000000: 74 6F 74 61 6C 20 35 38 : 20 20 20 20 20 20 20 20 total 58
000010: 20 20 20 20 20 20 20 20 : 32 20 62 61 63 6B 75 70 2 backup
000020: 2F 20 20 20 20 20 20 20 : 20 20 20 20 20 34 20 62 / 4 b
000030: 69 6E 2F 0D 0A 20 20 20 : 32 20 64 62 73 2F 20 20 in/.. 2 dbs/
000040: 20 20 20 20 20 20 20 20 : 20 20 20 20 20 32 20 65 2 e
000050: 78 70 6F 72 74 2F 20 20 : 20 20 20 20 20 20 20 20 xport/
000060: 20 20 32 20 6C 69 62 2F : 0D 0A 20 20 20 32 20 6C 2 lib/.. 2 l
000070: 6F 63 61 6C 2E 63 73 68 : 72 63 20 20 20 20 20 20 ocal.cshrc
000080: 20 20 32 20 6C 6F 63 61 : 6C 2E 6C 6F 67 69 6E 20 2 local.login
000090: 20 20 20 20 20 20 20 32 : 20 6C 6F 63 61 6C 2E 70 2 local.p
0000A0: 72 6F 66 69 6C 65 0D 0A : 20 20 20 32 20 6E 65 74 rofile.. 2 net
0000B0: 77 6F 72 6B 2F 20 20 20 : 20 20 20 20 20 20 20 20 work/
0000C0: 32 20 6F 63 6F 6D 6D 6F : 6E 2F 20 20 20 20 20 20 2 ocommon/
0000D0: 20 20 20 20 20 38 20 6F : 72 61 69 6E 73 74 2F 0D 8 orainst/.
0000E0: 0A 20 20 20 32 20 6F 74 : 72 61 63 65 2F 20 20 20 . 2 otrace/
0000F0: 20 20 20 20 20 20 20 20 : 20 32 20 6F 77 73 2F 20 2 ows/
000100: 20 20 20 20 20 20 20 20 : 20 20 20 20 20 20 32 20 2
000110: 70 6C 73 71 6C 2F 0D 0A : 20 20 20 32 20 70 72 65 plsql/.. 2 pre
000120: 63 6F 6D 70 2F 20 20 20 : 20 20 20 20 20 20 20 20 comp/
000130: 32 20 72 64 62 6D 73 2F : 20 20 20 20 20 20 20 20 2 rdbms/
000140: 20 20 20 20 20 32 20 73 : 6C 61 78 2F 0D 0A 20 20 2 slax/..
000150: 20 32 20 73 71 6C 6C 69 : 62 2F 20 20 20 20 20 20 2 sqllib/
000160: 20 20 20 20 20 20 32 20 : 73 71 6C 70 6C 75 73 2F 2 sqlplus/
000170: 20 20 20 20 20 20 20 20 : 20 20 20 32 20 73 74 61 2 sta
000180: 72 74 2E 73 71 6C 0D 0A : 20 20 20 32 20 73 74 61 rt.sql.. 2 sta
000190: 72 74 5F 6F 72 61 63 6C : 65 2A 20 20 20 20 20 20 rt_oracle*
0001A0: 32 20 73 74 6F 70 2E 73 : 71 6C 20 20 20 20 20 20 2 stop.sql
0001B0: 20 20 20 20 20 32 20 73 : 74 6F 70 5F 6F 72 61 63 2 stop_orac
0001C0: 6C 65 2A 0D 0A 20 20 20 : 32 20 73 76 72 6D 67 72 le*.. 2 svrmgr
0001D0: 2F 20 20 20 20 20 20 20 : 20 20 20 20 20 32 20 77 / 2 w
0001E0: 67 2F 0D 0A 25 20 : g/..% ..........
[26/May/1998:13:42:25 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 65 : e...............
[26/May/1998:13:42:25 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 65 : e...............
[26/May/1998:13:42:25 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 78 : x...............
[26/May/1998:13:42:25 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 78 : x...............
[26/May/1998:13:42:25 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 69 : i...............
[26/May/1998:13:42:25 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 69 : i...............
[26/May/1998:13:42:25 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 74 : t...............
[26/May/1998:13:42:26 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 74 : t...............
[26/May/1998:13:42:26 -0700] REQUEST 127.0.0.1 -> 10.1.2.65
000000: 0D 0A : ................
[26/May/1998:13:42:26 -0700] RESPONSE 10.1.2.65 -> 127.0.0.1
000000: 0D 00 0D 0A : ................
000000: 6C 6F 67 6F 75 74 0D 0A : logout..........
Tracing WWW Traffic
A handy use of the Bridge Proxy is to trace HTTP traffic to debug
the output of server-side scripts. By default, the port used to
connect to the Bridge Server is the Bridge Port. This
is inconvenient if you are attempting to trace traffic to an HTTP
server running on port 80. To side-step this issue, the Bridge Server
can specify both the hostname and port in the form:
Bridge Port = 80
Bridge Server = www.microsoft.com:80
Trace Bridge = true
With the above configuration, you can set your Browser to connect
via proxy and configure the proxy manually to localhost:8080.
Then request the page http://www.microsoft.com/ and the
requests be serviced by the Bridge Proxy and logged.
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