| 12 |
|
- Client Control Protocol |
| 13 |
|
- Client Data Protocol |
| 14 |
|
|
| 15 |
– |
|
| 15 |
|
Conventions |
| 16 |
|
----------- |
| 17 |
|
All protocols in this document assume a valid connection of |
| 25 |
|
character. For example: |
| 26 |
|
|
| 27 |
|
[OK|ERROR] |
| 28 |
< |
|
| 28 |
> |
|
| 29 |
|
Indicates that the message "OK" OR the message "ERROR" will |
| 30 |
|
be sent depending on the result of the last action. |
| 31 |
|
|
| 35 |
|
|
| 36 |
|
{lastmodified} |
| 37 |
|
|
| 38 |
< |
Indicates that data for use as 'last modified' will be |
| 39 |
< |
returned. |
| 38 |
> |
Indicates that data for use as 'last modified' will be |
| 39 |
> |
returned. |
| 40 |
|
|
| 41 |
< |
If [ERROR] is sent back at any time, this indicates that all |
| 41 |
> |
If [ERROR] is sent back at any time, this indicates that all |
| 42 |
|
communication is over. EXCEPT where otherwise specified! |
| 43 |
|
|
| 45 |
– |
|
| 44 |
|
Host Connection Protocol |
| 45 |
|
------------------------ |
| 46 |
|
The initial connection of a host to the i-scream server is |
| 56 |
|
[STARTCONFIG]----------> Requests to start |
| 57 |
|
receiving config |
| 58 |
|
information |
| 59 |
< |
|
| 59 |
> |
|
| 60 |
|
<---------- [OK|ERROR] If the server ok's |
| 61 |
|
the request or not |
| 62 |
|
|
| 65 |
|
(used when checking |
| 66 |
|
if the config has |
| 67 |
|
changed) |
| 68 |
< |
|
| 68 |
> |
|
| 69 |
|
<---------- [{lastmodified}Returns a long int |
| 70 |
|
|ERROR] time since epoch |
| 71 |
|
eg, 123456789 |
| 76 |
|
"measured in milli |
| 77 |
|
-seconds since the |
| 78 |
|
epoch" |
| 79 |
< |
|
| 79 |
> |
|
| 80 |
|
[FILELIST] ----------> Asks the server for |
| 81 |
|
the list of files |
| 82 |
|
that were used to |
| 84 |
|
(used when checking |
| 85 |
|
if the config has |
| 86 |
|
changed) |
| 87 |
< |
|
| 87 |
> |
|
| 88 |
|
<---------- [{filelist} Returns a semi-colon |
| 89 |
|
|ERROR] separated list of |
| 90 |
|
filenames |
| 91 |
|
eg, |
| 92 |
|
a.conf;b.conf;c.conf |
| 93 |
|
|
| 94 |
+ |
[FQDN] ----------> Asks the server to |
| 95 |
+ |
send the FQDN (fully |
| 96 |
+ |
qualified domain |
| 97 |
+ |
name) of the |
| 98 |
+ |
connecting host. |
| 99 |
+ |
|
| 100 |
+ |
<---------- [{fqdn} Returns the FQDN of |
| 101 |
+ |
|ERROR] the connected host, |
| 102 |
+ |
or error if it can't |
| 103 |
+ |
be looked up. |
| 104 |
+ |
|
| 105 |
|
********** LOOP START ********** |
| 106 |
|
This loop reads configuration |
| 107 |
|
properties from the config |
| 111 |
|
retrieved from the |
| 112 |
|
config file |
| 113 |
|
eg, UDPUpdateTime |
| 114 |
< |
|
| 114 |
> |
|
| 115 |
|
<---------- [{value}|ERROR]Returns the value of |
| 116 |
|
the requested config |
| 117 |
|
property |
| 120 |
|
find the requested |
| 121 |
|
property it returns |
| 122 |
|
ERROR to indicate |
| 123 |
< |
that fact, but |
| 124 |
< |
communication still |
| 123 |
> |
that fact, but |
| 124 |
> |
communication still |
| 125 |
|
proceeds |
| 126 |
< |
|
| 126 |
> |
|
| 127 |
|
********** LOOP UNTIL ********** |
| 128 |
|
The loop continues until the host |
| 129 |
|
sends the following message |
| 130 |
< |
|
| 130 |
> |
|
| 131 |
|
[ENDCONFIG] ----------> Indicates that the |
| 132 |
|
host requires no |
| 133 |
|
more config |
| 134 |
< |
|
| 134 |
> |
|
| 135 |
|
********** LOOP END ********** |
| 136 |
|
Communication continues |
| 137 |
< |
|
| 137 |
> |
|
| 138 |
|
<---------- [OK] Indicates that the |
| 139 |
|
server is ready to |
| 140 |
|
proceed |
| 141 |
< |
|
| 141 |
> |
|
| 142 |
|
[FILTER] ----------> Asks the server to |
| 143 |
|
send it the host |
| 144 |
|
information of a |
| 145 |
|
filter that it |
| 146 |
|
should connect to |
| 147 |
< |
|
| 147 |
> |
|
| 148 |
|
<---------- {filter} Returns a semi-colon |
| 149 |
|
separated list of |
| 150 |
|
FQDN hostname, UDP |
| 162 |
|
server that the host |
| 163 |
|
has finished an will |
| 164 |
|
disconnect |
| 165 |
< |
|
| 165 |
> |
|
| 166 |
|
<---------- [OK|ERROR] Indicates that the |
| 167 |
|
server is either ok |
| 168 |
|
or that it thought |
| 169 |
|
there was an error |
| 170 |
|
------------------------------------------------------------ |
| 171 |
< |
|
| 171 |
> |
|
| 172 |
|
Host Heartbeat Protocol |
| 173 |
|
----------------------- |
| 174 |
|
When a host is configured after it has connected it should |
| 186 |
|
[HEARTBEAT] ----------> Starts the |
| 187 |
|
heartbeat protocol |
| 188 |
|
off |
| 189 |
< |
|
| 189 |
> |
|
| 190 |
|
<---------- [OK|ERROR] Indicates that the |
| 191 |
|
server is ok or not |
| 192 |
|
|
| 249 |
|
server that the host |
| 250 |
|
has finished an will |
| 251 |
|
disconnect |
| 252 |
< |
|
| 252 |
> |
|
| 253 |
|
<---------- [OK|ERROR] Indicates that the |
| 254 |
|
server is either ok |
| 255 |
|
or that it thought |
| 270 |
|
The client control protocol channel is opened by the client |
| 271 |
|
and allows a variety of actions to be carried out by the |
| 272 |
|
client at anytime. Unlike previous protocols, this is NOT |
| 273 |
< |
sequential, all of the requests can be carried out in |
| 273 |
> |
sequential, all of the requests can be carried out in |
| 274 |
|
any order. |
| 275 |
|
|
| 276 |
|
All client protocols are backwards compatible, and the |
| 296 |
|
Host (direction) Server Comment |
| 297 |
|
------------------------------------------------------------ |
| 298 |
|
<initialise> |
| 290 |
– |
[CONNECT] ----------> Starts off the |
| 291 |
– |
client protocol |
| 292 |
– |
|
| 299 |
|
<---------- [{protocol}] The server sends the |
| 300 |
|
protocol identifier |
| 301 |
< |
|
| 301 |
> |
|
| 302 |
|
[{name}] ----------> The client sends its |
| 303 |
|
"name". This name |
| 304 |
|
is used to identify |
| 306 |
|
to the system and |
| 307 |
|
obtain its config |
| 308 |
|
eg, Conient |
| 309 |
< |
|
| 309 |
> |
|
| 310 |
|
<---------- [OK] Indicates the server |
| 311 |
|
is ok to proceed |
| 312 |
< |
|
| 312 |
> |
|
| 313 |
|
|
| 314 |
|
<command #1> (allows client to obtain its configuration) |
| 315 |
|
[STARTCONFIG]----------> Tell the server we |
| 316 |
|
want to start this |
| 317 |
|
command |
| 318 |
< |
|
| 318 |
> |
|
| 319 |
|
<---------- [OK] Indicates the server |
| 320 |
|
is ok to proceed |
| 321 |
< |
|
| 321 |
> |
|
| 322 |
|
********** LOOP START ********** |
| 323 |
|
This loop reads configuration |
| 324 |
|
properties from the config |
| 329 |
|
config file |
| 330 |
|
Clients can obtain |
| 331 |
|
host information |
| 332 |
< |
eg, |
| 332 |
> |
eg, |
| 333 |
|
Host.UDPUpdateTime |
| 334 |
|
Otherwise it must |
| 335 |
|
prefix requests |
| 337 |
|
All other requests |
| 338 |
|
will be ignored as |
| 339 |
|
if it was unable to |
| 340 |
< |
retieve the property |
| 341 |
< |
|
| 340 |
> |
retrieve the |
| 341 |
> |
property |
| 342 |
> |
|
| 343 |
|
<---------- [{value}|ERROR]Returns the value of |
| 344 |
|
the requested config |
| 345 |
|
property |
| 346 |
|
eg, 120 |
| 347 |
|
If it is unable to |
| 348 |
< |
find the requested |
| 348 |
> |
find the requested |
| 349 |
|
property it returns |
| 350 |
|
ERROR to indicate |
| 351 |
|
that fact |
| 352 |
< |
|
| 352 |
> |
|
| 353 |
|
********** LOOP UNTIL ********** |
| 354 |
|
The loop continues until the client |
| 355 |
|
sends the following message |
| 356 |
< |
|
| 357 |
< |
[ENDCONFIG] ----------> Indicates that the |
| 356 |
> |
|
| 357 |
> |
[ENDCONFIG] ----------> Indicates that the |
| 358 |
|
client requires no |
| 359 |
|
more config |
| 360 |
< |
|
| 360 |
> |
|
| 361 |
|
********** LOOP END ********** |
| 362 |
|
Communication continues |
| 363 |
< |
|
| 363 |
> |
|
| 364 |
|
<---------- [OK] Indicates that the |
| 365 |
|
server is ready to |
| 366 |
|
proceed |
| 369 |
|
[STARTDATA] ----------> Tell the server we |
| 370 |
|
want to start this |
| 371 |
|
command |
| 372 |
< |
|
| 372 |
> |
|
| 373 |
|
<---------- [{portnumber} The server then sets |
| 374 |
|
|ERROR] itself listening for |
| 375 |
|
a connection on its |
| 379 |
|
that it is listening |
| 380 |
|
on eg, 12367 |
| 381 |
|
If the data link is |
| 382 |
< |
yet to be started |
| 383 |
< |
the server will |
| 384 |
< |
return ERROR |
| 385 |
< |
|
| 386 |
< |
<---------- [OK] Indicates the server |
| 387 |
< |
is ok to proceed and |
| 388 |
< |
the client can |
| 389 |
< |
then connect its |
| 383 |
< |
data link |
| 382 |
> |
already started the |
| 383 |
> |
server will return |
| 384 |
> |
ERROR |
| 385 |
> |
|
| 386 |
> |
<---------- [OK] Indicates the client |
| 387 |
> |
has successfully |
| 388 |
> |
connected to the |
| 389 |
> |
data socket. |
| 390 |
|
|
| 391 |
|
<command #3> (tells the server to stop the data link) |
| 392 |
|
[STOPDATA] ----------> Tell the server we |
| 393 |
|
want to start this |
| 394 |
|
command |
| 395 |
|
The server then |
| 396 |
< |
shuts down the |
| 396 |
> |
shuts down the |
| 397 |
|
data link to the |
| 398 |
|
client |
| 399 |
|
|
| 409 |
|
client wants to |
| 410 |
|
close the control |
| 411 |
|
link |
| 412 |
< |
|
| 412 |
> |
|
| 413 |
|
<---------- [OK] The last word from |
| 414 |
|
the server, it will |
| 415 |
< |
disappear after this |
| 415 |
> |
disappear after |
| 416 |
> |
this, and close the |
| 417 |
> |
data link if |
| 418 |
> |
required |
| 419 |
|
------------------------------------------------------------ |
| 420 |
|
|
| 421 |
|
v1.1 - Protocol identifier: "PROTOCOL 1.1" (without quotes) |
| 429 |
|
[SETHOSTLIST]----------> Tell the server we |
| 430 |
|
want to start this |
| 431 |
|
command |
| 432 |
< |
|
| 432 |
> |
|
| 433 |
|
<---------- [OK|ERROR] The server will |
| 434 |
|
return an ERROR if |
| 435 |
|
the data link is |
| 436 |
|
open, as a host list |
| 437 |
< |
must ONLY be set |
| 437 |
> |
must ONLY be set |
| 438 |
|
if the data link is |
| 439 |
|
closed |
| 440 |
|
If the server is |
| 449 |
|
recieve data from |
| 450 |
|
eg, |
| 451 |
|
raptor.ukc.ac.uk;killigrew.ukc.ac.uk;chalk.ukc.ac.uk |
| 452 |
< |
|
| 452 |
> |
|
| 453 |
|
If the list is sent |
| 454 |
|
blank (or if no list |
| 455 |
|
is set at all) then |
| 456 |
|
data from ALL hosts |
| 457 |
|
will be sent to the |
| 458 |
< |
client |
| 459 |
< |
|
| 458 |
> |
client (this is the |
| 459 |
> |
default if no |
| 460 |
> |
SETHOSTLIST is not |
| 461 |
> |
run by the client |
| 462 |
> |
|
| 463 |
|
<---------- [OK] Indicates the server |
| 464 |
|
is ok to proceed and |
| 465 |
< |
the host list has |
| 465 |
> |
the host list has |
| 466 |
|
been accepted |
| 467 |
|
------------------------------------------------------------ |
| 468 |
|
|
| 469 |
|
Client Data Protocol |
| 470 |
|
-------------------- |
| 471 |
|
Once the data link has been opened by the control link, the |
| 472 |
< |
server will send XML formated data packets seperated by the |
| 473 |
< |
\n (newline) character. For information on the format of |
| 472 |
> |
server will send XML formatted data packets separated by the |
| 473 |
> |
\n (newline) character. For information on the format of |
| 474 |
|
this data see the XML via UDP specification document at: |
| 475 |
|
|
| 476 |
|
http://www.i-scream.org.uk/cgi-bin/docs.cgi?doc=specification/xml_via_udp.txt |
