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Working with Jobs
There are two types of command categories within objection. Simply put, a command is either run as a one time command, or, as a long running 'job'.
A one time command gets a Frida script loaded, executed and unloaded as soon as it is finished. This is often followed by some output presented in the terminal. Executing the one time command again will result in this process repeating. Examples of one time commands include ls, env and the file upload and file download commands
A 'job' however gets a Frida script loaded, executed and is then left running in the background. If the job has output that needs to be displayed, it will be shown in the REPL prefixed with a short job-id and name such as [2dff56c320d5] [jailbreak-simulate] followed by the message itself. You can continue using the REPL as these jobs are running in the background. Multiple jobs could be running at once too. Example commands that are run as jobs include ios jailbreak simulate, ios pasteboard monitor and ios hooking dump method_args.
Nothing special is needed to start a new job. Commands that are supposed to run as jobs will automatically start as needed.
A special note should be made for the import command. Frida scripts loaded with the import command are also run as jobs automatically:
sensepost’s iPad on (iPad: 10.2.1) [usb] # import test.js
Job: 55321569-cd6b-4eb6-82a6-ef3cbc0cce88 - Starting
Job: 55321569-cd6b-4eb6-82a6-ef3cbc0cce88 - Started
sensepost’s iPad on (iPad: 10.2.1) [usb] # jobs list
UUID Name Started
------------------------------------ ----------- -------------------
55321569-cd6b-4eb6-82a6-ef3cbc0cce88 user-script 2017-07-09 12:05:32
A generic name of user-script is used for jobs started with the import command, unless a name is specified:
sensepost’s iPad on (iPad: 10.2.1) [usb] # import test.js "my test command"
Job: 0286fc37-66f1-4b05-882a-9125d96097be - Starting
Job: 0286fc37-66f1-4b05-882a-9125d96097be - Started
sensepost’s iPad on (iPad: 10.2.1) [usb] # jobs list
UUID Name Started
------------------------------------ --------------- -------------------
55321569-cd6b-4eb6-82a6-ef3cbc0cce88 user-script 2017-07-09 12:05:32
0286fc37-66f1-4b05-882a-9125d96097be my test command 2017-07-09 12:05:45
With the ability to have multiple jobs running at once, objection provides a jobs command that lets you list and kill jobs as needed.
sensepost’s iPad on (iPad: 10.2.1) [usb] # jobs list
UUID Name Started
------------------------------------ ------------------------------- -------------------
cf1c8381-5c55-4658-b9fd-2dff56c320d5 simulate-jailbroken-environment 2017-07-09 11:38:51
27c38e53-4c3e-468b-8948-5c5a31dbc7d2 pasteboard-monitor 2017-07-09 11:58:06
In the example above, we have two jobs running. If we wanted to stop the pasteboard-monitor job, we can simply run jobs kill 27c38e53-4c3e-468b-8948-5c5a31dbc7d2 (job ids are tab completable):
sensepost’s iPad on (iPad: 10.2.1) [usb] # jobs kill 27c38e53-4c3e-468b-8948-5c5a31dbc7d2
Job: 27c38e53-4c3e-468b-8948-5c5a31dbc7d2 - Stopping
Job: 27c38e53-4c3e-468b-8948-5c5a31dbc7d2 - Stopped
Killing a job results in it finally getting unloaded, just like the last step in a one time command. When you exit the REPL, as part of the exit routines, all of the remaining jobs that are still running will also be unloaded.