GitHub pull request #3128 of commit f29bec08edda9cb621680f600ee67b4d978326f1, no merge conflicts.sha1origin/pr/3128/mergeghprbActualCommitf29bec08edda9cb621680f600ee67b4d978326f1ghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/nabilschear/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3128ghprbTargetBranchmasterghprbSourceBranchtcpconnect_dnsGIT_BRANCHtcpconnect_dnsghprbPullAuthorEmailghprbPullAuthorLoginnabilschearghprbPullAuthorLoginMention@nabilschearghprbPullDescriptionGitHub pull request #3128 of commit f29bec08edda9cb621680f600ee67b4d978326f1, no merge conflicts.ghprbPullTitleadd DNS correlation to connect trackingghprbPullLinkhttps://github.com/iovisor/bcc/pull/3128ghprbPullLongDescriptionoften i'd like to be able to track DNS domains that were associated with an IP at the time of connect. So, I wired up a simple and hopefully low-overhead kprobe to udp_recvmsg that will capture DNS response packets and put them into a cache dictionary in user space. When connect syscalls come in, then it will look for a corresponding DNS query in the cache. It will also note the time delta between when the DNS response was received and when the connect happened.\r\n\r\nThis requires dnslib and expiringdict python packages. dnslib is already required by an example in the bcc tree: https://github.com/iovisor/bcc/blob/b0bf04ac4042a6c004b15dcc5e40e12ae78020f9/examples/networking/dns_matching/dns_matching.py but I couldn't find anywhere to add these dependencies for a core tool. Looking for help here.\r\nghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="add DNS correlation to connect tracking" href="https://github.com/iovisor/bcc/pull/3128">PR #3128</a>: add DNS correlation to conn...#70710230047460664bcc-pr #707707false7075664FAILURE1602197464353https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/707/git707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=fc25/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=fc26/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=fc27/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=fc28/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=ubuntu1604/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=ubuntu1710/707/707https://buildbot.iovisor.org/jenkins/user/a.s.protopopov/my-views/view/all/job/bcc-pr/label=ubuntu1804/707/