OmaDm

Introduction
This page will document knowledge about OmaDm. Note that some previous research of the over-the-wire behaviour of OmaDm has been done at Update_Service_Trace.

OmaDm seems to be involved in carrier provisioning and webOS OTA updates. Its working directory seems to be /var/lib/software.

It is called from UpdateDaemon, with the following arguments (found by using strings on the UpdateDaemon binary):

OmaDm -syncdata OmaDm -revert_tree OmaDm -set_domain OmaDm -client OmaDm -task OmaDm -server OmaDm -prepare OmaDm -prepare %X OmaDm -report_results

Working Directory
If you doctor and boot a device with the UpdateDaemon and OmaDm binaries disables, you get the following directory contents:

ModemFiles (empty directory) SessionFiles (empty directory) system_settings.info (contains localeCountry and localeLanguage settings) tmp (empty directory)

OmaDm -syncdata
If you run "OmaDm -syncdata", a couple of files appear:

DmTree.backup.xml DmTree.xml

On a Veer, you also get the following error message:

[RdmInitCarrier: 423]: Unrecognized carrier ATT

The OmaDm binary seems to have support for Sprint, bell, ROW, and Verizon only. We're not sure whether this is a problem for AT&T or other carrier devices, but we'll assume that it is intentional for the moment.

Note that while "OmaDm -syncdata" can create the DmTree files from scratch, it gives an error if you run it on files with invalid contents:

[SyncData: 316]: TRG_RDM_init error: 24577

Removing the DmTree.xml file and re-running "OmaDm -syncdata" is enough to regenerate both files.

An strace on "OmaDm -syncdata" shows that it reads the following locations:

/usr/share/omadm/DmTree.xml /usr/share/omadm/none /etc/prefs/properties/DMCARRIER /dev/tokens/DMCARRIER /etc/prefs/properties/PalmSN /dev/tokens/PalmSN /etc/prefs/properties/DMCLoAUTHNAME /dev/tokens/DMCLoAUTHNAME /etc/prefs/properties/DMCLoAUTHPW /dev/tokens/DMCLoAUTHPW /etc/prefs/properties/DMCLoNONCE /dev/tokens/DMCLoNONCE /etc/prefs/properties/DMSVRoAUTHPW /dev/tokens/DMSVRoAUTHPW /etc/prefs/properties/DMSVRoNONCE /dev/tokens/DMSVRoNONCE /etc/prefs/properties/buildNumber /etc/palm-build-info /usr/lib/ipkg/info/*.control

and writes to:

/var/log/omadm.log /var/lib/software/DmTree.xml /var/lib/software/DmTree.backup.xml

The /var/log/omadm.log file also shows that OmaDm does a platformQuery and imeiQuery on the com.palm.telephony service to get the platformType, imei, capabilities and version of the cellular subsystem.

An OmaDm binary strings examination shows that /usr/share/omadm/none may be a flag file to disable software updates.

It seems that the /etc/prefs/properties directory can use used to override the device tokens and build information. This may be handy for other purposes ...

So in general, the DmTree.xml files contain authorisation information, a list of currently installed packages (with a build number for each), and possibly cellular provisioning information (need to check this on a CDMA device).

The template for DmTree.xml can be found in /usr/share/omadm/DmTree.xml and is populated with the information gained from reading all the input data sources.

It seems that "OmaDm -syncdata" is additive, replicating the package-related contents in the DmTree.xml files each time it is called.

OmaDm -revert_tree
At this point, the DmTree.backup.xml and DmTree.xml files are identical.

Experimentation with changing the contents of the files shows that "OmaDm -revert_tree" simply overwrites DmTree.xml with the contents of DmTree.backup.xml.

OmaDm -set_domain
Running "OmaDm -set_domain" results in the following errors:

[RdmInitCarrier: 423]: Unrecognized carrier ATT [RdmSetDomain: 506]: Unable to open /var/lib/software/domain [SetDomain: 376]: RdmSetDomain error

The first is spurious. The second and third indicate that a "domain" file is required. Perhaps the UpdateDaemon binary supplies this file.

Creating a "domain" file and then running "OmaDm -set_domain" results in the contents of the "domain" file being used to generate the PalmOMADMAcc.AppAddr.SrvAddr.Addr node contents (with "https://" prepended and "/palmcsext/swupdateserver" appended to it).

Examination of a normal device indicates that the "domain" file normally has the contents "ps.palmws.com" (with no terminating newline character), resulting in a "https://ps.palmws.com/palmcsext/swupdateserver" value in the DmTree.xml files.

The "domain" file is written by UpdateDaemon each time it starts, based on the "locationHost" system preference.

OmaDm -client
Calling "OmaDm -client" updates some authentication values in DmTree.xml and creates the following files in the SessionFiles directory:

client_server.xml component_list dmhttps.header server_client.xml