Transcript No Slide Title

ArcIMS Emulation
with IMSEMU
A Short Introduction to ArcXML
and Reverse Engineering
Paul Ramsey
Refractions Research
www.refractions.net
OpenSource GIS 2004
Ottawa, Canada
What Map Servers Do
• “Tell me what you have!?!”
• “I have some layers.”
• “Give me a map of this place!! Use
these layers!”
• “OK, here’s a map.”
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OpenSource GIS 2004
Ottawa, Canada
Map Server Languages
• OpenGIS Web Map Server (URL GET)
– GETCAPABILITIES
– GETMAP
– GETFEATUREINFO
• ESRI ArcXML (XML POST)
– <GET_SERVICE_INFO>
– <GET_IMAGE>
– <GET_FEATURES>
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OpenSource GIS 2004
Ottawa, Canada
ArcIMS Emulation
• Goal: Speak ArcXML Like a Native
MapScript
ArcXML
ESRI Client
IMSEMU
Mapserver
ArcMap
ArcExplorer
Web Page
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OpenSource GIS 2004
Ottawa, Canada
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OpenSource GIS 2004
Ottawa, Canada
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OpenSource GIS 2004
Ottawa, Canada
EMU
IMSEMU
•
•
•
•
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Perl CGI
Mapscript
com.esri.esrimap.Esrimap
Requires:
HTTP Server,
Perl with,
XML::Parser
XML::Writer
Perl Mapscript
OpenSource GIS 2004
Ottawa, Canada
ArcIMS  Mapserver
ArcIMS
Mapserver
• One Server,
Multiple Services
• Projection ID
• WKT Projection
• One Server,
Multiple Map Files
• EPSG Number
• Proj4 Projection
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OpenSource GIS 2004
Ottawa, Canada
IMSEMU Installation
• Copy com.esri.esrimap.Esrimap to CGI
directory
• Edit httpd.conf to alias “servlets”
ScriptAlias /servlet/ "/home/www/mapserv/cgi-bin/"
• Edit head of script to point to valid map files
my @files = (
“92K,26910,/home/www/mapserv/maps/92k.map”,
“PGIS,42102,/home/www/mapserv/maps/pgsql.map”
);
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OpenSource GIS 2004
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IMSEMU Operation
• Responds to ArcIMS-style requests
http://mapserver.refractions.net
/servlet/com.esri.esrimap.Esrimap
?ServiceName=catalog
&CustomStream=False
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OpenSource GIS 2004
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POST /servlet/com.esri.esrimap.Esrimap
?ServiceName=BCView
&CustomStream=False HTTP/1.1
Content-Length: 120
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT)
Host: mapserver.refractions.net
Connection: Keep-Alive
Cache-Control: no-cache
<?xml version="1.0" encoding="UTF-8"?>
<ARCXML version="1.0.1">
<REQUEST dpi="96">
<GET_SERVICE_INFO/>
</REQUEST>
</ARCXML>
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OpenSource GIS 2004
Ottawa, Canada
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.0
Date: Wed, 24 Oct 2001 17: 08:42 GMT
Content-Type: text/plain
Connection: Keep-Alive
encoding="UTF-8"
Causes ArcMap to CRASH
<?xml version="1.0" ?>
<ARCXML version="1.1"><RESPONSE><SERVICES>
<SERVICE NAME="ActiveMODIS Fires"
SERVICEGROUP="FeatureServer1" ACCESS="PUBLIC"
TYPE="FeatureServer" DESC="" group="*"
STATUS="ENABLED">
<ENVIRONMENT>
<LOCALE country="US" language="en" />
<UIFONT name="Arial" />
</ENVIRONMENT>
</SERVICE>
</SERVICES></RESPONSE></ARCXML>
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OpenSource GIS 2004
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Learning the Lingo
• Read the ArcXML Reference
– google arcxml reference
• Sniff the Wire
ESRI Client
Sniffer
ArcXML
ArcMap
ArcExplorer
Web Page
ArcIMS
HTTPLook
ngrep
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OpenSource GIS 2004
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HTTPLook
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OpenSource GIS 2004
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ngrep
ngrep -d eth0 host 192.168.50.71 and tcp port 80
T 128.128.40.68:80 -> 192.168.50.71:2044 [AP]
HTTP/1.1 200 ..Date: Tue, 01 Jun 2004 04:12:07 GMT..Server: Apache/2.0.42 (
Win32) mod_jk/1.2.4..Content-Language: en..Keep-Alive: timeout=15, max=99..
Connection: Keep-Alive..Transfer-Encoding: chunked..Content-Type: text/plai
n; charset=ISO-8859-1....160.....d....<?xml version="1.0" encoding="UTF-8"?
>..<ARCXML version="1.1">..<RESPONSE>..<IMAGE>..<ENVELOPE minx="-86.5816123
189285" miny="30.3584262004056" maxx="-86.4186258678133" maxy="30.482580309
1411" />.....d....<OUTPUT url="http://coastalmap.marine.usgs.gov/output/GoM
ex_shoreline_change_KAI24668574026.jpg" />..</IMAGE>..</RESPONSE>..</ARCXML
>.....f..
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OpenSource GIS 2004
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use LWP::UserAgent;
perl
$url = "http://198.102.62.145/servlet/com.esri.esrimap.Esrimap
dÅ<?xml
version="1.0" encoding="UTF-8"?>
?ServiceName=ESRI_World&CustomStream=True
<ARCXML
version="1.1">
&ClientLocale=en_US&ClientVersion=3.1";
<RESPONSE>
<IMAGE>
my $ua = new LWP::UserAgent;
<ENVELOPE minx="-209.086532572264" miny="-143.954474147845"
maxx="187.681589360453"
maxy="158.281645579426"
/>
my $req = HTTP::Request->new(POST
=> $url);
dÓ<OUTPUT
file="/net/dbserver/work/common/geonet/maps/ESRI_World_bluemap1191031348
$req->content(qq{<?xml version="1.0" encoding="UTF-8"?><ARCXML
1.gif"
version="1.1"><REQUEST><GET_IMAGE><PROPERTIES><ENVELOPE minx="url="http://redlands.geographynetwork.com/out/maps/ESRI_World_bluemap119
209.08653257226464" miny="-143.95447414784505"
10313481.gif"
/>
maxx="187.68158936045373"
maxy="158.28164557942696" /><IMAGESIZE
</IMAGE>
width="596" height="454" dpi="96" /><LAYERLIST order="true"><LAYERDEF
</RESPONSE>
id="V1 Coverage 3" visible="true”
</ARCXML>
/></LAYERLIST></PROPERTIES></GET_IMAGE></REQUEST></ARCXML>});
f
my $res = $ua->request($req);
if ($res->is_success) {
print $res->content;
}
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OpenSource GIS 2004
Ottawa, Canada
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...d....<?xml versio
n="1.0" encoding="UT
F-8"?>..<ARCXML vers
ion="1.1">..<RESPONS
E>..<IMAGE>..<ENVELO
PE minx="-209.086532
572264" miny="-143.9
54474147845" maxx="1
87.681589360453" max
y="158.281645579426"
/>.....d....<OUTPUT
file="/net/dbserver
/work/common/geonet/
maps/ESRI_World_redm
ap5370313433.gif" ur
l="http://redlands.g
eographynetwork.com/
out/maps/ESRI_World_
redmap5370313433.gif
" />..</IMAGE>..</RE
SPONSE>..</ARCXML>..
...f
207
OpenSource GIS 2004
Ottawa, Canada
ArcIMS Modes
• ServiceName=catalog
• CustomStream=True|False
• Encode=True|False
• Form=True|False
• ClientLocale=en_US
• ClientVersion=3.1
www.refractions.net
OpenSource GIS 2004
Ottawa, Canada
IMSEMU Capabilities
• Image Serving
–
–
–
–
GET_CLIENT_SERVICES
GET_SERVICE_INFO
GET_IMAGE
FILTER_COORDSYS
(Coordinate Reprojection)
– CustomStream=True|False
– Encode=True|False
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OpenSource GIS 2004
Ottawa, Canada
IMSEMU To Do
• Feature Serving
– GET_FEATURE
(default, xml, xmlnew)
– SPATIALQUERY / QUERYFILTER
• Image Serving with
Selections and Acetates
– Inline LAYER objects.
www.refractions.net
OpenSource GIS 2004
Ottawa, Canada
Questions?
www.refractions.net
OpenSource GIS 2004
Ottawa, Canada