zen barcode c# example Figure 2-2. Network Utility in Objective-C

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Figure 2-2. Network Utility
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As a sanity check, many organizations will choose to verify that the Open Directory Master is accessible by a client prior to attempting to bind. You can also script against the same tool that Network Utility uses to perform port scans, called stroke. To use stroke, you will need to cd into the Network Utility application bundle using the command:
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cd /Applications/Utilities/Network\ Utility.app/Contents/Resources/
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Once you are in this directory, you will need to provide stroke with an IP address (or name), followed by a port range specifying the lowest port first, a space, and then
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CHAPTER 2: Directory Services Clients
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the last. Use the same number twice if your range is only a single port. For example, if you want to port scan port 389 on your own system you could use the following (assuming a working directory of /Applications/Utilities/Network Utility.app/Contents/Resources):
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./stroke 127.0.0.1 389 389
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If your Open Directory Master were named seldon.company.com, then you could use the following code to check availability, by DNS name of the LDAP service on the server:
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./stroke seldon.company.com 389 389
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Because the name seldom.company.com has to resolve, you re actually able to check whether a DNS error occurs and whether you can communicate over port 389 to the host in one command. If you plan to use stroke a lot, you may want to create a symlink to the binary in a directory that is specified in your environment s PATH, you can then use it without needing to change your working directory:
ln s /Applications/Utilities/Network\ Utility.app/Contents/Resources/stroke /usr/bin/stroke
NOTE: If you can scan port 389 (or port 636, if you are using SSL) from the server using localhost (127.0.0.1) then it typically stands to reason that if you cannot access port 389 on the server from a client via IP or DNS that you likely have a network problem that is preventing connectivity---even if the server requires authentication to enumerate the directory tree it should still listen over the LDAP port for said authentication. The second way to check that LDAP is available to your client systems is to telnet into port 389 of the host running the LDAP service. There are a number of services that can be tested in this manner, including most web servers and SMTP. For each service you would simply follow telnet by the name (or IP address) of the host you are testing and then the port, as follows:
telnet seldom.company.com 389
At this point, you should receive a response similar to the following, which by virtue of the Connected line shows that you were indeed able to communicate with port 389:
Trying 192.168.210.249... Connected to 192.168.210.249. Escape character is '^]'.
You can also go a step further and use a third party tool to query an LDAP server, without performing any custom configurations of Mac OS X. LDapper is an application that will allow you to authenticate to and display information accessible through LDAP. LDapper has a number of options that mirror various settings within LDAP, and so becomes a good tool for figuring out what LDAP settings to use when configuring the
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CHAPTER 2: Directory Services Clients
Directory Utility for binding. The ability to enter different settings and quickly obtain results makes LDapper a great tool for enumerating an LDAP environment and is very helpul for troubleshooting connectivity problems. To use LDapper, first download it from http://carl-bell-2.baylor.edu/~Carl_Bell/ stuff.html. Once the dmg file has been downloaded, drag the LDapper application bundle into your /Applications directory. From here, open LDapper by doubleclicking on it and then select Preferences from the LDapper menu, as shown in Figure 2-3.
Figure 2-3. LDapper Preferences
Next, click on the Plus sign and then enter a friendly name (to remember the specific server by) into the Directory Name: field and then enter a server s hostname or IP
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