[libvirt] [PATCH 0/6] NSS module for libvirt

Are you tired of remembering IP addresses for your domains? Do you have enough of configuring static IPs so that you can add them to your hosts file? Then libvirt NSS module is exactly what you need! NSS does a lot in a Linux host. These patches aim at translating domain names into IP addresses. All you need to do, is install libnss_libvirt.so.2 (e.g. via 'make install' ran from source dir), enable the module in nsswitch.conf: $ grep libvirt /etc/nsswitch.conf hosts: files dns libvirt and you're all set. Now you can just: $ ping $mydomain $ ssh user@$mydomain or anything you'd like. The only limitation is that it has to be libvirt who has assigned the domain IP address. The limitation comes from implementation in which '/var/lib/libvirt/dnsmasq/*.status' files are parsed when looking up a hostname. What's beautiful on this feature is that it helps any users regardless of their systemd attitude. On systemd hosts there already exists a similar module 'mymachines' which takes its data from machined. And libvirt does communicate with machined when creating a domain. But unfortunately at that time we know nothing about guest's IPs and therefore do not tell them to machined, which in turn can't tell anything to mymachines module. To make things worse, machined seems to be lacking an API to tell it the addresses later on when libvirt finds out. Therefore even systemd distros will benefit from this feature. If the feature makes its way in, I'll describe all the steps in a wiki (hence, no documentation in this patch set - although, if you have a bright idea where should I put it, I'm all ears). Enjoy! Michal Privoznik (6): Export virLease* functions for leases file handling virjson: Resolve const correctness Initial support for NSS plugin skeleton nss: Implement _nss_libvirt_gethostbyname3_r Implement _nss_libvirt_gethostbyname4_r nss: Introduce a test cfg.mk | 2 +- configure.ac | 2 + m4/virt-nss.m4 | 51 ++++++ po/POTFILES.in | 1 + src/Makefile.am | 1 + src/libvirt_private.syms | 6 + src/network/leaseshelper.c | 271 +-------------------------- src/util/virjson.c | 58 +++--- src/util/virjson.h | 54 +++--- src/util/virlease.c | 304 ++++++++++++++++++++++++++++++ src/util/virlease.h | 44 +++++ tests/Makefile.am | 18 ++ tests/nssdata/virbr0.status | 14 ++ tests/nssmock.c | 140 ++++++++++++++ tests/nsstest.c | 184 +++++++++++++++++++ tools/Makefile.am | 45 +++++ tools/nss/libvirt_nss.c | 436 ++++++++++++++++++++++++++++++++++++++++++++ tools/nss/libvirt_nss.h | 52 ++++++ tools/nss/libvirt_nss.syms | 12 ++ 19 files changed, 1368 insertions(+), 327 deletions(-) create mode 100644 m4/virt-nss.m4 create mode 100644 src/util/virlease.c create mode 100644 src/util/virlease.h create mode 100644 tests/nssdata/virbr0.status create mode 100644 tests/nssmock.c create mode 100644 tests/nsstest.c create mode 100644 tools/nss/libvirt_nss.c create mode 100644 tools/nss/libvirt_nss.h create mode 100644 tools/nss/libvirt_nss.syms -- 2.4.10