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* Allow different external interfaces for IPv4 and IPv6 connectivityDavid Gibson2022-07-304-21/+27
| | | | | | | | | | | | | | | | It's quite plausible for a host to have both IPv4 and IPv6 connectivity, but only via different interfaces. For example, this will happen in the case that IPv6 connectivity is via a tunnel (e.g. 6in4 or 6rd). It would also happen in the case that IPv4 access is via a tunnel on an otherwise IPv6 only local network, which is a setup that might become more common in the post IPv4 address exhaustion world. In turns out there's no real need for passt/pasta to get its IPv4 and IPv6 connectivity via the same interface, so we can handle this situation fairly easily. Change the core to allow eparate external interfaces for IPv4 and IPv6. We don't actually set these separately for now. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Expand root partition of Debian sid amd64 and aarch64 imagesStefano Brivio2022-07-291-0/+12
| | | | | | | | | | | | | | | A couple of days ago, we started running out of space there as we're about to install gcc -- about 50 MiB are missing. Given that virt-resize (which could be conveniently invoked by the Makefile for tests) reorders partitions if we expand the first one, resize the image using qemu-img from the test script itself, and then take care of expanding root partition and filesystem online later. This is probably a temporary hack, so I'm not looking for a more generic or elegant solution at the moment. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt: Truncate PID file on open()Stefano Brivio2022-07-221-1/+1
| | | | | | | Otherwise, if the current PID has fewer digits than a previously written one, the content will be wrong. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* demo: Use git protocol downloadsDavid Gibson2022-07-222-2/+2
| | | | | | | | For some reason using https to clone from the passt git repo is very slow, at least from network-distant places. Use git protocol in the demo instead to avoid a tedious wait to get the source. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: No need to retrieve host ifname in ndp/pastaDavid Gibson2022-07-221-3/+2
| | | | | | | | | With pasta, the namespace interface name is generally the same as the host interface name. We already rely on this in the dhcp/pasta tests, but for no clear reason ndp/pasta separately determines the host interface name. Remove this unnecessary step. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Clean up better after iperf testsDavid Gibson2022-07-221-1/+1
| | | | | | | | | | | | | The iperf based test commands create a bunch of .bw and .pid files for each iperf client and server. The server side .bw files are cleaned up afterwards, but the pid files are not, and none of the client side files are cleaned up. The latter doesn't really matter when the client is run on ephemeral guests, but sometimes we run it in a namespace that shares the filesystem with the host. Clean up all of these files after the tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Use dhclient --no-pid for namespaces in two_guests testsDavid Gibson2022-07-221-4/+4
| | | | | | | | | | Before starting the guests, these tests configure addresses in a pasta namespace using dhclient. However, because it's a user namespace, it's not running as "real" root and can't write to the dhclient pid file. This doesn't stop it working, but causes an ugly error message which we can avoid by using the --no-pid option. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove unnecessary truncation of temporary files in udp testsDavid Gibson2022-07-223-18/+0
| | | | | | | | | All the UDP tests use :> to truncate some temporary data files. This appears to be so that they're empty before writing data to them with tee. However tee, by default, truncates its output file anyway (you need tee -a to append). So drop the unnecessary truncations. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove unnecessary ^D in passt_in_ns teardownDavid Gibson2022-07-221-2/+0
| | | | | | | | | | | | | | | | | teardown_passt_in_ns() sends a ^D to the NS pane, which appears to be intended to terminate the nsenter running there, leaving the namespace. However, we've also sent a ^D to the PASST pane which will exit the pasta instance which created the namespace. With the namespace destroyed the nsenter in the NS pane will be killed, so it does not need to be exited explicitly. In fact sending the extra ^D can be harmful, since it will exit the shell in which the nsenter was run, causing the whole pane to be closed. That can then mean that the "pane_wait NS" hangs indefinitely. I believe this will sometimes work, because there's a race between the various options here, but it should be more reliable without the extra ^D. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Use socat instead of netcatDavid Gibson2022-07-2211-200/+200
| | | | | | | | | | | | | | | Commit 41c02e10 ("tests: Use nmap-ncat instead of openbsd netcat for pasta tests") updated the pasta tests to use the nmap version of ncat instead of the openbsd version, for greater portability. For some upcoming changes, however, we'll be wanting to use socat. "socat" can do everything "ncat" can and more, so let's move all the tests using host tools (either directly on the host or via mbuto generated images) to using socat instead. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Fix a typo in port specification, 31337 instead of x31337] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* valgrind needs futexDavid Gibson2022-07-221-1/+1
| | | | | | | | | Some versions of valgrind (such as the version on my Fedora laptop - valgrind-3.19.0-3.fc36.x86_64) use futexes. But futex is currently not allowed in the seccomp filter, even with the extra calls added for valgrind builds. Add it, to avoid spurious valgrind failures. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Fix creation of test file in udp passt testsDavid Gibson2022-07-221-1/+1
| | | | | | | | | | In what looks like a copy-and-paste error from the TCP script, the udp/passt test script creates a test file called '__TEMP_BIG__', while the commands it use the variable __TEMP__. Correct this so that a) we actually transfer the data we created for the purpose and b) we don't leave a stale __TEMP_BIG__ file in the current directory. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Fix detection of empty 'hout' responses in passt{,_in_ns} testsDavid Gibson2022-07-221-0/+14
| | | | | | | | | | | | | | The dhcp/passt and dhcp/passt_in_ns tests at least, and maybe others use 'hout' commands that need to be able to detect empty output. However, we don't set PS1, which means the screen-scraping logic which detects this may not be reliable. In addition, if the host is using a recent bash, it will have bracketed paste mode enabled which will also add escape codes which will mess up the empty output detection. Set the prompt and disable bracketed paste mode from the passt and passt_in_ns setups to avoid these problems. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Correctly handle domain search list in dhclient-scriptDavid Gibson2022-07-221-3/+3
| | | | | | | | | | | Currently our small custom dhclient-script only handles the 'domain-name' option, which can just list a single domain, not the 'domain-search' option, which can handle several. Correct it to handle both. We also weren't emptying the resolv.conf file before we began, which could lead to surprising contents after multiple DHCP transactions. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Handle the case of a nameserver on host localhostDavid Gibson2022-07-221-2/+2
| | | | | | | | | | | | We previously introduced a change to passt to handle the case where the host machine is its own nameserver - so resolv.conf points to 127.0.0.1. In this case we advertize the gateway as the DNS server for the guest, which in turn will be redirected back to the host by existing passt logic. The dhcp/passt doesn't handle this case correctly, so add some logic to account for it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: More robust parsing of resolv.conf for DHCP testsDavid Gibson2022-07-221-8/+8
| | | | | | | | | | | | | | | | | To check publishing of DNS information via DHCP, we need to extract a list of nameservers and/or search domains from resolv.conf in the test script. The current version (usually) leaves the result with a trailing ','. That's usually ok because it happens on both guest and host sides. However it's kind of confusing, and might stop working if the host had a resolv.conf without a trailing \n on the last line. It also makes some later changes we'll need more difficult. So, normalize the output from resolv.conf a bit further, removing any trailing ','. It turns out we can do this with a slightly less complex sed expression than the one we already have. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Add some extra dhclient support directories to mbuto.imgDavid Gibson2022-07-221-1/+1
| | | | | | | | Although it can operate without them, dhclient can issue errors if it doesn't have /var/run to write a pid file and /var/lib to write a leases file. Create those in mbuto.img to stop it complaining. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Add rudimentary debugging to dhclient-scriptDavid Gibson2022-07-221-1/+5
| | | | | | | | We now supply a minimal dhclient-script of our own in the mbuto boot image. There are some problems with it, so add some basic logging to help debug it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Let Fedora find dhclient-script in /usr/sbinDavid Gibson2022-07-221-0/+1
| | | | | | | | | | | | Modern Fedora (and RHEL) systems have /sbin as a symlink to /usr/sbin (along with a number of similar links). Along with that it expects to find dhclient-script in /usr/sbin/dhclient-script rather than /sbin/dhclient-script. Link them together in our mbuto image so that the Fedora build of dhclient can find it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove no longer needed /usr/bin/bash linkDavid Gibson2022-07-221-2/+1
| | | | | | | | | | | | AFAICT the symlink we created in mbuto from /usr/bin/bash to /bin/sh was for the benefit of a dhclient-script which used /usr/bin/bash as its interpreter (e.g. in Fedora). That was a bit risky if the script really did require bash and we linked it to dash or another shell. We now supply our own custom dhclient-script, so we don't need the link any more. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Drop further ^D in passt demo teardownStefano Brivio2022-07-221-5/+1
| | | | | | | | | Similar case as the one fixed by David's patch "tests: Remove unnecessary ^D in passt_in_ns teardown": we happen to pseudo-randomly close panes by unnecessarily exiting the parent shells there, and subsequent pane_wait directives hang. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: Actually use pasta in Podman demo step with HTTP serviceStefano Brivio2022-07-221-1/+1
| | | | | | ...instead of slirp4netns. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: Fix Podman build in Podman demoStefano Brivio2022-07-221-0/+2
| | | | | | | For some reason, I now have to update some "vendored" dependencies on a fresh git clone, at least in my environment, before building. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: In pasta demo, issue /sbin/dhclient instead of dhclientStefano Brivio2022-07-221-2/+2
| | | | | | | | This was dependent on my own environment where I usually have /sbin in $PATH. If that's missing, given that we're running dhclient as user, we won't find it. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: In demos, use pgrep instead of pstree to find namespace PIDStefano Brivio2022-07-222-8/+6
| | | | | | | | | | | | Parsing pstree's output is somewhat unreliable: there might be multiple pasta instances running on the same host, and depending on the overall output width pstree might truncate some branches. Ask pasta to save its PID to file, and use that as parameter for pgrep to find the PID of the interactive shell whose user and network namespaces we want to join. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: In passt demo, bring up eth0 in guest, not in namespace paneStefano Brivio2022-07-211-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* contrib: Rebase Podman patch to latest upstreamStefano Brivio2022-07-211-50/+41
| | | | | | A few trivial conflicts came up. No semantic changes. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* qrap: Add a neighbour solicitation to probe frames, instead of just ARP2022_07_20.9af2e5dStefano Brivio2022-07-201-4/+32
| | | | | | | | | | | | | | | | For a while now, passt disables ARP functionality completely if IPv4 is disabled. If qrap sends an ARP request as a probe in that case, it will receive no answer and move on, trying to find another instance. Add a second probe frame, a hardcoded neighbour solicitation, so that we get a neighbour advertisement if IPv6 is enabled. Without this change, IPv6-only operation is completely broken. Reported-by: Wenli Quan <wquan@redhat.com> Reported-by: Alona Paz <alkaplan@redhat.com> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2106257 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Reset range endpoints after parsing one excluded port specifier2022_07_14.b86cd00Stefano Brivio2022-07-141-0/+1
| | | | | | | | | I forgot to reset the range endpoints after parsing an item of the comma-separated list in commit 220759efb89a ("conf: Allow to specify ranges and ports excluded from given ranges") -- fix that. Fixes: 220759efb89a ("conf: Allow to specify ranges and ports excluded from given ranges") Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* demo/passt: Bring interface up before starting dhclient in guestStefano Brivio2022-07-141-0/+2
| | | | | | ...I forgot about one occurrence of this. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Allow to specify ranges and ports excluded from given rangesStefano Brivio2022-07-142-13/+127
| | | | | | | | | | | | | | | | | | | | | This is useful in environments where we want to forward a large number of ports, or all non-ephemeral ones, and some other service running on the host needs a few selected ports. I'm using ~ as prefix for the specification of excluded ranges and ports to avoid the need for explicit command line quoting. Ranges and ports can be excluded from given ranges by adding them in the comma-separated list, prefixed by ~. Some quick examples: -t 5000-6000,~5555: forward ports 5000 to 6000, but not 5555 -t ~20000-20010: forward all non-ephemeral, allowed ports, except for ports 20000 to 20010 ...more details in usage message and man page. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Fix initialisation of IPv6 unicast and link-local addressesStefano Brivio2022-07-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | In commit 675174d4ba25 ("conf, tap: Split netlink and pasta functions, allow interface configuration"), I broke the initial setting of the observed IPv6 addresses in two ways: - the size copied from the configured addresses corresponds to an IPv4 address, not to an IPv6 address - the observed link-local address is initialised to the configured unicast address, not the link-local one If we haven't seen the guest using some type of addresses yet, we should default to the configured values, hence these initial settings: fix both. This resulted in UDP flows to the guest from a unique local address on the network not working before the guest shows passt a valid address itself, as reported by Alona. Reported-by: Alona Paz <alkaplan@redhat.com> Link: https://bugs.passt.top/show_bug.cgi?id=16 Fixes: 675174d4ba25 ("conf, tap: Split netlink and pasta functions, allow interface configuration") Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* util: Fix debug print on failed SO_REUSEADDR setting in sock_l4()Stefano Brivio2022-07-141-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt: Allow exit_group() system call in seccomp profilesStefano Brivio2022-07-143-2/+4
| | | | | | | | | | | | We handle SIGQUIT and SIGTERM calling exit(), which is usually implemented with the exit_group() system call. If we don't allow exit_group(), we'll get a SIGSYS while handling SIGQUIT and SIGTERM, which means a misleading non-zero exit code. Reported-by: Wenli Quan <wquan@redhat.com> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2101990 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* arch, passt: Use executable link to form AVX2 binary pathStefano Brivio2022-07-142-13/+21
| | | | | | | | | | | | | | | | ...instead of argv[0], which might or might not contain a valid path to the executable itself. Instead of mangling argv[0], use the same link to find out if we're already running the AVX2 build where supported. Alternatively, we could use execvpe(), but that might result in running a different installed version, in case e.g. the set of binaries is present in both /usr/bin and /usr/local/bin, with both being in $PATH. Reported-by: Wenli Quan <wquan@redhat.com> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2101310 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Remove unused DNS6 calculation from fedora testsDavid Gibson2022-07-143-4/+3
| | | | | | | | | | | | | | | | | | The Fedora test file extracts some information from the host resolv.conf into a DNS6 variable which is then never used. Remove this unnecessary step, which is presumably a leftover from an earlier iteration. This was the only user of 'head' and 'sed' in the test file, so those can also be removed from the required tools. The debian and ubuntu test files also listed 'head' and 'sed' as tools, although they don't use them, I'm guessing because of an earlier version which had the same DNS6 code. Remove those as well. The opensuse test file still actually uses DNS6, so leave it there for now. The DNS handling and network config handling for SuSE looks to be kind of broken, but fixing that is a job for another day. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Prepare distro images during asset build phaseDavid Gibson2022-07-146-325/+69
| | | | | | | | | | | | | | | | | | | | | | | Before booting the guest images, the distro test cases need to modify the guest images, using virt-edit and guestfish, to boot in the way we need. At present this gets repeated on every test run, even though it's not really doing anything we want to test for. In addition many of the images have the same preparation steps leading to a lot of duplicated stages in the tests. A number of additional images can be prepared using common steps, even if the ones used now have small differences. Therefore move the preparation of most of the guest images to the asset build phase, where they can be done a single time for multiple test runs, using a common preparation script. We can even avoid making a copy of the disk image for booting, by using qemu's -snapshot option. A few of the distros (openSUSE and older Ubuntu) do need different steps. For now we don't chage how they are run, they could possibly be handled more like this in future. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Move distro image download to asset build makefileDavid Gibson2022-07-146-46/+178
| | | | | | | | | | | | Rather than directly download distro images from the test scripts, handle all the downloads during the test asset build, then just clone them for the tests themselves. This avoids repeated downloads which can be very slow when debugging failing tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Add OPENSUSE_IMGS to DOWNLOAD_ASSETS in Makefile, and note that xzcat doesn't take a -O option in test/distro/opensuse] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Explicitly list test files in test/run, remove "onlyfor" supportDavid Gibson2022-07-1423-67/+31
| | | | | | | | | | | | | | | | | Currently test/run uses wildcards to run all of the tests in a directory. However, that wildcard list is filtered down by the "onlyfor" directives in the test files... usually to a single file. Therefore, just explicitly list the files we *really* want to run for this test mode. This makes it easier to see at the top level what tests will be executed, and to change that list temporarily while debugging specific failures. This means the "onlyfor" directive no longer has any purpose, and we can remove it. "onlyfor" was also the only used of the $MODE variable, so we can remove that too. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Don't automatically traverse directories of test filesDavid Gibson2022-07-142-26/+26
| | | | | | | | | | | | | | | The top level listing control of which tests to run is in test/run, however it uses the test() function which runs an entire directory of test files, filtered by some criteria. This makes it awkward to narrow down to a subset of tests when debugging a specific failure. To make this easier, have test() take an explicit list of test files to run, and have the caller in test/run handle the directory traversal. The construct we use for this is pretty awkward to handle the fact that we're in the source tree root directory rather than test/ at this point in test/run. Later cleanups will improve that. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove not-very-useful "req" directiveDavid Gibson2022-07-143-53/+31
| | | | | | | | | | | | | | | | | The test scripts support a "req" directive which requires one test script to be run before another. It's implemented by doing a topological sort based on these directives in the runner scripts, which is about as awkward as you'd expect in Bourne shell. It turns out we only use this functionality in one place - to make the "make install" test run after the plain "make" test. We also already have a simpler way of making sure tests run in a specific order: just put them into the same test script file. So, remove support for the "req" directive and just fold the build/all and build/install test scripts together. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove unused set_mode() functionDavid Gibson2022-07-141-13/+0
| | | | | | This utility function is never called. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Clean up passt.pid fileDavid Gibson2022-07-142-1/+3
| | | | | | | | If the tests are interrupted at the right point a passt.pid file can be left over. Clean it up with "make clean" and add it to .gitignore so it doesn't get accidentally committed. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Search multiple places for aarch64 EDK2 bios imageDavid Gibson2022-07-146-13/+30
| | | | | | | | | | | | | | | | | Apparently qemu's ARM virt machine needs to be explicitly given a firmware image, rather than just supplying a sane default. Unfortunately the EDK2 firmware image we need isn't in the same place on all host distros. Currently the test scripts hardcode the Debian location, meaning it will break on hosts that have it somewhere else. This patch searches multiple locations for the firmware, and creates a local link during the asset build phase, which the tests can then use. For now it only searches the locations used by Debian and Fedora, but that's a small improvement in robustness already, and can be later improved further if we need to. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Move mbuto download and execution to asset buildDavid Gibson2022-07-143-19/+16
| | | | | | | | | | | | Move the download of mbuto and using it to create a sample initramfs to the asset build makefile, rather than embedding it in the test scripts themselves. The two_guests tests used to use two separate copies of the mbuto image. As an initramfs the mbuto image is strictly readonly though, so that's not necessary. So, also use the same image for both guests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Introduce makefile for building test assetsDavid Gibson2022-07-142-1/+28
| | | | | | | | | | | | | | A number of passt/pasta testcases have initial steps which are just about building images or other assets we need for the test proper. Repeating these for each test run can be quite costly. This patch makes a start on moving this sort of test asset building to a separate phase before running the tests proper. For now just add a Makefile to handle the asset building (although it doesn't build anything yet), and make the path where we'll be building the assets available to the tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Invoke specific qemu-system-* binariesDavid Gibson2022-07-147-34/+43
| | | | | | | | | | | | | | | | | | | | | | A lot of tests and examples invoke qemu with the command "kvm". However, as far as I can tell, "kvm" being aliased to the appropriate qemu system binary is Debian specific. The binary names from qemu upstream - qemu-system-$ARCH - also aren't universal, but they are more common (they should be good for both Debian and Fedora at least). In order to still get KVM acceleration when available, we use the option "-M accel=kvm:tcg" to tell qemu to try using either KVM or TCG in that order A number of the places we invoked "kvm" are expecting specifically an x86 guest, and so it's also safer to explicitly invoke qemu-system-x86_64. Some others appear to be independent of the target arch (just wanting the same arch as the host to allow KVM acceleration). Although I suspect there may be more subtle x86 specific options in the qemu command lines, attempt to preserve arch independence by using $(uname -m). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: qemu-system-ppc64le isn't a thingDavid Gibson2022-07-142-6/+6
| | | | | | | | | | | | Several tests run pp64le guests using "qemu-system-ppc64le". But, at the system level there's no difference between ppc64 and ppc64le - it's the same hardware, just placed into different endian modes by OS early boot code. Reflecting that, qemu only supplies a single "qemu-system-ppc64". Some distros alias qemu-system-ppc64le to qemu-system-ppc64 (Debian does), but it's best not to count on this (Fedora doesn't, for example). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Handle the case of a DNS server on localhostDavid Gibson2022-07-141-0/+16
| | | | | | | | | | | | | | | | | | By default, passt detects the nameserver used by the host system by reading /etc/resolv.conf, and advertises that to the guest via DHCP. However this breaks down if the host's nameserver is local (on 127.0.0.1 or ::1); connecting to localhost on the guest won't reach the host's nameserver. Using a local nameserver is a reasonably common case when using dnsmasq or similar to merge name resolution on a home network with name resolution from an organization-private VPN. We already have the gateway mapping support to allow reaching host-local services from the guest via the address of the default gateway. Add code to detect the case of a local DNS server and use the gateway mapping to advertise it usefully to the guest. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Embed script for dhclient(8) in mbuto(1) profileStefano Brivio2022-07-144-10/+26
| | | | | | | | | | | | | | | | | | | | | | | | | David reports that dhclient-script(8) on Fedora needs a number of binaries that are not included in PROGS of the current mbuto profile, and we would also need to include hostnamectl(1) there, which will fail without a systemd init. Embed a minimal script for dhclient(8) in the profile itself, written to /sbin/dhclient-script at boot, to just check what we need to check out of DHCP and DHCPv6 functionality. While at it, drop busybox and logger from PROGS, as we don't need them, and add hostname(1). While DHCP option 12 isn't supported yet by the DHCP implementation in passt, we should probably add it soon. Note: owing to the simplicity of this script, we now need to bring up the interface before starting dhclient: add this in test scripts where it's not the case yet. Reported-by: David Gibson <david@gibson.dropbear.id.au> Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> note that we need to bring up the interface before starting dhclient
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