If you have finished changing the Wireshark sources to suit your needs, you might want to contribute your changes back to the Wireshark community. You gain the following benefits by contributing your improvements:
There’s no direct way to push changes to the Git repository. Only a few people are authorised to actually make changes to the source code (check-in changed files). If you want to submit your changes, you should upload them to the code review system at https://code.wireshark.org/review. This requires you to set up git as described at Section 3.3.1, “Git over SSH or HTTPS”.
Some tips that will make the merging of your changes into Git much more likely (and you want exactly that, don’t you?):
git diffand make sure you aren’t adding, removing, or omitting anything you shouldn’t.
In general, making it easier to understand and apply your patch by one of the maintainers will make it much more likely (and faster) that it will actually be applied.
Wireshark is a volunteer effort. You aren’t paying to have your code reviewed and integrated.
When running git commit, you will be prompted to describe the change. Here are some guidelines on how to make that message actually useful to other people (and to scripts that may try to parse it):
Wireshark currently supports the following metadata tags:
Table 3.1. Commit message tags
A unique hash describing the change, which is generated automatically by the git commit-msg hook which you installed during setup. This should not be changed, even when rebasing or amending a commit following code review. If you pass --no-verify to git commit you will have to add this line yourself.
Make Gerrit automatically add a comment and close the given bug number when the commit is merged. For use when the change does fully fix the issue.
Make Gerrit just add a comment to the referenced bug. For use when the change is related but does not fully fix the issue.
Putting all that together, we get the following example:
MIPv6: fix dissection of Service Selection Identifier APN field is not encoded as a dotted string so the first character is not a length Bug: 10323 Change-Id: Ia62137c785d505e9d0f1536a333b421a85480741
To ensure Wireshark’s code quality and to reduce friction in the code review process, there are some things you should consider before submitting a patch:
Developing a new dissector as a plugin can make compiling and testing quicker, but it’s usually best to convert it to built-in before submitting for review. This reduces the number of files that must be installed with Wireshark and ensures your dissector will be available on all platforms.
Dissectors vary, so this is not a hard-and-fast rule. Most dissectors are single C modules that can easily be put into “the big pile.” Some (most notably ASN.1 dissectors) are generated using templates and configuration files. Others are split across multiple source files and are often more suitable to be placed in a separate plugin directory.
In your local repository directory, there will be a .git/hooks/ directory, with sample git hooks for running automatic actions before and after git commands. You can also optionally install other hooks that you find useful.
In particular, the pre-commit hook will run every time you commit a change and can be used to automatically check for various errors in your code. The sample git pre-commit hook simply detects whitespace errors such as mixed tabs and spaces. To install it just remove the .sample suffix from the existing pre-commit.sample file.
Wireshark provides a custom pre-commit hook which does additional Wireshark-specific API and formatting checks, but it might return false positives.
If you want to install it, copy the pre-commit file from the tools directory (
cp ./tools/pre-commit .git/hooks/) and make sure it is executable or it will not be run.
If the pre-commit hook is preventing you from committing what you believe is a valid change, you can run
git commit --no-verify to skip running the hooks.
Warning: using --no-verify avoids the commit-msg hook, and thus will not automatically add the required Change-ID to your commit.
In case you are not updating an existing patch you may generate a Change-ID by running
git review -i (or
git commit --amend if don’t use git review).
Additionally, if your system supports symbolic links, as all UNIX-like platforms do, you can use them instead of copying files.
Running ln -s ./tools/pre-commit .git/hooks creates a symbolic link that will make the hook to be up-to-date with the current master.
The same can be done for commit-msg script.
Wireshark is released under the GPL version 2 or later, and it is strongly recommended that incoming code use that license. If that is not possible, it must use a compatible license. The following licenses are currently allowed:
When you’re satisfied with your changes (and obtained any necessary approval from your organization) you can upload them for review at https://code.wireshark.org/review. This requires a Gerrit Code Review account as described at Section 3.2, “The Wireshark Git repository”.
Changes should be pushed to a magical "refs/for" branch in Gerrit. For example, to upload your new Snowcone Machine Protocol dissector you could push to refs/for/master with the topic "snowcone-machine":
$ git push ssh://[email protected]:29418/wireshark HEAD:refs/for/master/snowcone-machine
my.username is the one which was given during registration with
the review system.
If you have
git-review installed you can upload the change with a lot less typing:
# Note: The "-f" flag deletes your current branch. $ git review -f
You can push using any Git client. Many clients have support for Gerrit, either built in or via an additional module.
The Change-Id is very relevant in the review process, since it’s the key used to identify one change. See the Gerrit manual for more details.
You might get one of the following responses to your patch request:
If you’re concerned, feel free to add a comment to the patch or send an email to the developer’s list asking for status. But please be patient: most if not all of us do this in our spare time.
When a bug is fixed in the master branch it might be desirable or necessary to backport the fix to a stable branch. You can do this in Git by cherry-picking the change from one branch to another. Suppose you want to backport change 1ab2c3d4 from the master branch to master-1.10. Using "pure Git" commands you would do the following:
# Create a new topic branch for the backport. $ git checkout -b backport-g1ab2c3d4 origin/master-1.10 # Cherry-pick the change. Include a "cherry picked from..." line. $ git cherry-pick -x 1ab2c3d4 # If there are conflicts, fix them. # Compile and test the change. $ make $ ... # OPTIONAL: Add entries to docbook/release-notes.adoc. $ $EDITOR docbook/release-notes.adoc # If you made any changes, update your commit: $ git commit --amend -a # Upload the change to Gerrit $ git push ssh://[email protected]:29418/wireshark HEAD:refs/for/master-1.10/backport-g1ab2c3d4
If you want to cherry-pick a Gerrit change ID (e.g. I5e6f7890) you can use
git review -X I5e6f7890 instead of
git cherry-pick and
git push as described in the previous chapter.