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* build: Force-create pasta symlinkRichard W.M. Jones2022-11-251-1/+1
| | | | | | | | | | | | If you run the build several times it will fail unnecessarily with: ln -s passt pasta ln: failed to create symbolic link 'pasta': File exists make: *** [Makefile:134: pasta] Error 1 Signed-off-by: Richard W.M. Jones <rjones@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* util: Allow sock_l4() to open dual stack socketsDavid Gibson2022-11-251-0/+5
| | | | | | | | | | | | | | | Currently, when instructed to open an IPv6 socket, sock_l4() explicitly sets the IPV6_V6ONLY socket option so that the socket will only respond to IPv6 connections. Linux (and probably other platforms) allow "dual stack" sockets: IPv6 sockets which can also accept IPv4 connections. Extend sock_l4() to be able to make such sockets, by passing AF_UNSPEC as the address family and no bind address (binding to a specific address would defeat the purpose). We add a Makefile define 'DUAL_STACK_SOCKETS' to indicate availability of this feature on the target platform. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* inany: Helper functions for handling addresses which could be IPv4 or IPv6David Gibson2022-11-251-3/+3
| | | | | | | | | | | | | | struct tcp_conn stores an address which could be IPv6 or IPv4 using a union. We can do this without an additional tag by encoding IPv4 addresses as IPv4-mapped IPv6 addresses. This approach is useful wider than the specific place in tcp_conn, so expose a new 'union inany_addr' like this from a new inany.h. Along with that create a number of helper functions to make working with these "inany" addresses easier. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tcp: Move connection state structures into a shared headerDavid Gibson2022-11-251-1/+2
| | | | | | | | | | | | | | | Currently spliced and non-spliced connections use completely independent tracking structures. We want to unify these, so as a preliminary step move the definitions for both variants into a new tcp_conn.h header, shared by tcp.c and tcp_splice.c. This requires renaming some #defines with the same name but different meanings between the two cases. In the process we correct some places that are slightly out of sync between the comments and the code for various event bit names. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* clang-tidy: Suppress warning about assignments in if statementsDavid Gibson2022-11-251-0/+5
| | | | | | | | | | | | clang-tools 15.0.0 appears to have added a new warning that will always complain about assignments in if statements, which we use in a number of places in passt/pasta. Encountered on Fedora 37 with clang-tools-extra-15.0.0-3.fc37.x86_64. Suppress the new warning so that we can compile and test. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Change HPPA into PARISC while building PASST_AUDIT_ARCHStefano Brivio2022-11-161-0/+1
| | | | | | | | | | | The AUDIT_ARCH defines in seccomp.h corresponding to HPPA are AUDIT_ARCH_PARISC and AUDIT_ARCH_PARISC64. Build error spotted in Debian's buildd log on phantom.physik.fu-berlin.de. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: It's AUDIT_ARCH_MIPSEL64, not AUDIT_ARCH_MIPS64ELStefano Brivio2022-11-161-0/+1
| | | | | | | | | | | | On mips64el, gcc -dumpmachine correctly reports mips64el as architecture prefix, but for some reason seccomp.h defines AUDIT_ARCH_MIPSEL64 and not AUDIT_ARCH_MIPS64EL. Mangle AUDIT_ARCH accordingly. Build error spotted in Debian's buildd logs from Loongson build. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Don't filter out -O2 from supplied flags for AVX2 buildsStefano Brivio2022-11-161-1/+1
| | | | | | | | | | Drop it from the internal FLAGS variable, but honour -O2 if passed in CFLAGS. In Debian packages, dpkg-buildflags uses it as hardening flag, and we get a QA warning if we drop it: https://qa.debian.org/bls/bytag/W-dpkg-buildflags-missing.html Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Honour passed CPPFLAGS, not just CFLAGSStefano Brivio2022-11-161-7/+7
| | | | | | | | | | | CPPFLAGS allow the user to pass pre-processor flags. This is unlikely to be needed at the moment, but the Debian Hardening Walkthrough reasonably requests it to be handled in order to fully support hardened build flags: https://wiki.debian.org/HardeningWalkthrough#Handling_dpkg-buildflags_in_your_upstream_build_system Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* conf, log, Makefile: Add versioning informationStefano Brivio2022-10-151-0/+3
| | | | | | | Add a --version option displaying that, and also include this information in the log files. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* log, conf: Add support for logging to fileStefano Brivio2022-10-141-5/+10
| | | | | | | | | | | | | | | | | | | | | | In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Move logging functions to a new file, log.cStefano Brivio2022-10-141-2/+2
| | | | | | | | Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Hack for optimised-away store in ndp() before checksum calculation2022_09_29.06aa26fStefano Brivio2022-09-291-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With gcc 11 and 12, passing -flto, or -flto=auto, and -O2, intra-procedural optimisation gets rid of a fundamental bit in ndp(): the store of hop_limit in the IPv6 header, before the checksum is calculated, which on x86_64 looks like this: ip6hr->hop_limit = IPPROTO_ICMPV6; b8c0: c6 44 24 35 3a movb $0x3a,0x35(%rsp) Here, hop_limit is temporarily set to the protocol number, to conveniently get the IPv6 pseudo-header for ICMPv6 checksum calculation in memory. With LTO, the assignment just disappears from the binary. This is rather visible as NDP messages get a wrong checksum, namely the expected checksum plus 58, and they're ignored by the guest or in the namespace, meaning we can't get any IPv6 routes, as reported by Wenli Quan. The issue affects a significant number of distribution builds, including the ones for CentOS Stream 9, EPEL 9, Fedora >= 35, Mageia Cauldron, and openSUSE Tumbleweed. As a quick workaround, declare csum_unaligned() as "noipa" for gcc 11 and 12, with -flto and -O2. This disables inlining and cloning, which causes the assignment to be compiled again. Leave a TODO item: we should figure out if a gcc issue has already been reported, and report one otherwise. There's no apparent justification as to why the store could go away. Reported-by: Wenli Quan <wquan@redhat.com> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2129713 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Extend noinline workarounds for LTO and -O2 to gcc 12Stefano Brivio2022-09-291-3/+3
| | | | | | | | | | | | | | | | Commit 1a563a0cbd49 ("passt: Address gcc 11 warnings") works around an issue where the remote address passed to hash functions is seen as uninitialised by gcc, with -flto and -O2. It turns out we get the same exact behaviour on gcc 12.1 and 12.2, so extend the applicability of the same workaround to gcc 12. Don't go further than that, though: should the issue reported at: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78993 happen to be fixed in a later version of gcc, we won't need the noinline attributes anymore. Otherwise, we'll notice. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Remove unused unmatchedSuppression suppressionsDavid Gibson2022-09-291-3/+0
| | | | | | | | | | | It's unclear what original suppressions these unmatchedSuppression suppressions were supposed to go with. They don't trigger any warnings on the current code that I can tell, so remove them. If we find a problem with some cppcheck versions in future, replace them with inline suppressions so it's clearer exactly where the issue is originating. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Mark unused functions for cppcheckDavid Gibson2022-09-291-1/+0
| | | | | | | | | | We have a couple of functions that are unused (for now) by design. Although at least one has a flag so that gcc doesn't warn, cppcheck has its own warnings about this. Add specific inline suppressions for these rather than a blanket suppression in the Makefile. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Remove unused va_list_usedBeforeStarted suppressionDavid Gibson2022-09-291-2/+0
| | | | | | | | | I can't get this warning to trigger, even without the suppression, so remove it. If it shows up again on some cppcheck version, we can replace it with inline suppressions so it's clear where the issue lay. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Remove unused objectIndex suppressionsDavid Gibson2022-09-291-3/+0
| | | | | | | | | | I can't get these warnings to trigger on the cppcheck versions I have, so remove them. If we find in future we need to replace these, they should be replaced with inline suppressions so its clear what's the section of code at issue. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Remove unused knownConditionTrueFalse suppressionDavid Gibson2022-09-291-2/+0
| | | | | | | | | | | | | | I can't get this warning to trigger, so I think this suppression must be out of date. Whether that's because we've changed our code to no longer have the problem, or because cppcheck itself has been updated to remove a false positive I don't know. If we find that we do need a suppression like this for some cppcheck version, we should replace it with an inline suppression so it's clear what exactly is triggering the warning. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Regenerate seccomp.h if seccomp.sh changesDavid Gibson2022-09-291-2/+2
| | | | | | | | seccomp.sh generates seccomp.h, so if we change it, we should re-build seccomp.h as well. Add this to the make dependencies so it happens. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Remove localtime suppression for pcap.cDavid Gibson2022-09-291-1/+0
| | | | | | | | | Since bf95322f "conf: Make the argument to --pcap option mandatory" we no longer call localtime() in pcap.c, so we no longer need the matching cppcheck suppression. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Broaden suppression for unused struct membersDavid Gibson2022-09-291-2/+1
| | | | | | | | | | | | | | | | In a number of places in passt we use structures to represent over the wire or in-file data with a fixed layout. After initialization we don't access the fields individually and just write the structure as a whole to its destination. Unfortunately cppcheck doesn't cope with this pattern and thinks all the structure members are unused. We already have suppressions for this in pcap.c and dhcp.c However, it also appears in dhcp.c and netlink.c at least. Since this is likely to be common, it seems wiser to just suppress the error globally. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Use inline suppression for strtok() in conf.cDavid Gibson2022-09-291-1/+0
| | | | | | | | | | | strtok() is non-reentrant and old-fashioned, so cppcheck would complains about its use in conf.c if it weren't suppressed. We're single threaded and strtok() is convenient though, so it's not really worth reworking at this time. Convert this to an inline suppression so it's adjacent to the code its annotating. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Use inline suppressions for qrap.cDavid Gibson2022-09-291-2/+1
| | | | | | | | | qrap.c uses several old-fashioned functions that cppcheck complains about. Since it's headed for obselesence anyway, just suppress these rather than attempting to modernize the code. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Use inline suppression for ffsl()David Gibson2022-09-291-2/+0
| | | | | | | | | | We define our own ffsl() as a weak symbol, in case our C library doesn't include it. On glibc systems which *do* include it, this causes a cppcheck warning because unsurprisingly our version doesn't pick the same argument names. Convert the suppression for this into an inline suppression. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Clean up parsing in conf_runas()David Gibson2022-09-291-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | conf_runas() handles several of the different possible cases for the --runas argument in a slightly odd order. Although it can parse both numeric UIDs/GIDs and user/group names, it can't parse a numeric UID combined with a group name or vice versa. That's not obviously useful, but it's slightly surprising gap to have. Rework the parsing to be more systematic: first split the option into user and (optional) group parts, then separately parse each part as either numeric or a name. As a bonus this removes some clang-tidy warnings. While we're there also add cppcheck suppressions for getpwnam() and getgrnam(). It complains about those because they're not reentrant. passt is single threaded though, and is always likely to be during this initialization code, even if we multithread later. There were some existing suppressions for these in the cppcheck invocation but they're no longer up to date. Replace them with inline suppressions which, being next to the code, are more likely to stay correct. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Add target specific headersDavid Gibson2022-09-291-1/+1
| | | | | | | | | Debian and similar distros put target specific header files in /usr/include/<arch-vendor-os>, rather than directly in /usr/include. Add this directory to the includes for cppcheck so it can find them. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Simplify getting target triple for compilerDavid Gibson2022-09-291-2/+2
| | | | | | | | | | We do some manipulation of the output of cc -v to get the target triple for the platform, to locate headers for cppcheck. However, we can get this more easily with cc -dumpmachine - and in fact we do so elsewhere in the Makefile. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Run quietlyDavid Gibson2022-09-291-1/+1
| | | | | | | | Adding the --quiet option to cppcheck makes the actual errors and warnings easier to find. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cppcheck: Avoid excessive scanning due to system headersDavid Gibson2022-09-291-14/+6
| | | | | | | | | | | | | | | | | make cppcheck takes a long time, because it checks a large number of different configurations. It's assembling this very large set of configurations not because of conditionals in the passt code itself, but from those in the system headers. By adding --config-exclude directives to stop considering those configs, make cppcheck becomes around 60x faster on my system. Similarly, any problems that are found in the system headers are not our problem, and so we can uniformly suppress them, rather than having specific suppressions for particular problems in particular files (which might not be correct for all different distro / version combinations either). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* clang-tidy: Disable 'readability-identifier-length'David Gibson2022-09-291-1/+6
| | | | | | | | This check complains about any identifier of less than 3 characters. For locals and parameters this is often pointlessly verbose. Disable it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Improve types and names for port forwarding configurationDavid Gibson2022-09-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | enum conf_port_type is local to conf.c and is used to track the port forwarding mode during configuration. We don't keep it around in the context structure, however the 'init_detect_ports' and 'ns_detect_ports' fields in the context are based solely on this. Rather than changing encoding, just include the forwarding mode into the context structure. Move the type definition to a new port_fwd.h, which is kind of trivial at the moment but will have more stuff later. While we're there, "conf_port_type" doesn't really convey that this enum is describing how port forwarding is configured. Rename it to port_fwd_mode. The variables (now fields) of this type also have mildly confusing names since it's not immediately obvious whether 'ns' and 'init' refer to the source or destination of the packets. Use "in" (host to guest / init to ns) and "out" (guest to host / ns to init) instead. This has the added bonus that we no longer have locals 'udp_init' and 'tcp_init' which shadow global functions. In addition, add a typedef 'port_fwd_map' for a bitmap of each port number, which is used in several places. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Fix the name of the qemu-system-* executableVasiliy Ulyanov2022-09-241-4/+4
| | | | | | | | | | | | | | | Define the target machine architecture in lowercase. The name of the executable qemu-system-* is defined from the build flags and should be in lowercase: ( "qemu-system-" ARCH ), I.e. qemu-system-x86_64 instead of qemu-system-X86_64. Otherwise, the exec call will fail. Signed-off-by: Vasiliy Ulyanov <vulyanov@suse.de> Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
* Makefile: Include seccomp.h in HEADERS and require it for static checkersStefano Brivio2022-09-221-3/+3
| | | | | | | | Targets running static checkers (cppcheck and clang-tidy) need seccomp.h, but the latter is not included in HEADERS. Add it. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Allow define overrides by prepending, not appending, CFLAGSStefano Brivio2022-09-221-24/+25
| | | | | | | | | | | | | | | | | | | If we append CFLAGS to the ones passed via command line (if any), -D options we append will override -D options passed on command line (if any). For example, OpenSUSE build flags include -D_FORTIFY_SOURCE=3, and we want to have -D_FORTIFY_SOURCE=2, if and only if not overridden. The current behaviour implies we redefine _FORTIFY_SOURCE as 2, though. Instead of appending CFLAGS, prepend them by adding all the default build flags to another variable, a simply expanded one (defined with :=), named FLAGS, and pass that *before* CFLAGS in targets, so that defines from command line can override default flags. Reported-by: Dario Faggioli <dfaggioli@suse.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Tested-by: Dario Faggioli <dfaggioli@suse.com>
* Move self-isolation code into a separate fileDavid Gibson2022-09-131-4/+4
| | | | | | | | passt/pasta contains a number of routines designed to isolate passt from the rest of the system for security. These are spread through util.c and passt.c. Move them together into a new isolation.c file. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Honour LDFLAGS for binary targetsStefano Brivio2022-09-071-3/+3
| | | | | | | | | | | | | We don't set any, but we should use them if they are passed in the environment. On a Fedora Rawhide package build, annocheck (https://sourceware.org/annobin/) reports: Hardened: /usr/bin/passt: FAIL: bind-now test because not linked with -Wl,-z,now ...despite the build system exporting -Wl,-z,now in LDFLAGS. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Use more GNU-style directory variables, explicit docdir for OpenSUSE2022_08_21.7b71094Stefano Brivio2022-08-211-11/+17
| | | | | | | | | | | | | It turns out that, while on most distributions "docdir" would be /usr/share/doc, it's /usr/share/doc/packages/ on OpenSUSE Tumbleweed. Use an explicit docdir as shown in: https://en.opensuse.org/openSUSE:Build_Service_cross_distribution_howto and don't unnecessarily hardcode directory variables in the Makefile. Otherwise, RPM builds for OpenSUSE will fail now that we have a README there. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Install demo.sh too, uninstall stuff under /usr/shareStefano Brivio2022-08-201-0/+4
| | | | | Suggested-by: Benson Muite <benson_muite@emailplus.org> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Ugly hack to get a "plain" Markdown version of READMEStefano Brivio2022-08-201-3/+27
| | | | | | | | | | | | | | | | | | Distribution packages reasonably expect to have a human-readable Markdown version of the README under /usr/share/doc/, but all we have right now is a heavily web-oriented version. Introduce a ugly hack to strip web-oriented parts from the current README and install it. It should probably work the other way around: a human-readable README could be used as a source for the web page. But cgit needs a file that's in the tree, not something that can be built, and https://passt.top/ is based on cgit. It should eventually be doable to work around this in cgit, instead. Reported-by: Benson Muite <benson_muite@emailplus.org> 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>
* passt: Allow exit_group() system call in seccomp profilesStefano Brivio2022-07-141-1/+1
| | | | | | | | | | | | 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>
* Clean up passt.pid fileDavid Gibson2022-07-141-1/+2
| | | | | | | | 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>
* Add cleaner line-by-line reading primitivesDavid Gibson2022-07-061-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Two places in passt need to read files line by line (one parsing resolv.conf, the other parsing /proc/net/*. They can't use fgets() because in glibc that can allocate memory. Instead they use an implementation line_read() in util.c. This has some problems: * It has two completely separate modes of operation, one buffering and one not, the relation between these and how they're activated is subtle and confusing * At least in non-buffered mode, it will mishandle an empty line, folding them onto the start of the next non-empty line * In non-buffered mode it will use lseek() which prevents using this on non-regular files (we don't need that at present, but it's a surprising limitation) * It has a lot of difficult to read pointer mangling Add a new cleaner implementation of allocation-free line-by-line reading in lineread.c. This one always buffers, using a state structure to keep track of what we need. This is larger than I'd like, but it turns out handling all the edge cases of line-by-line reading in C is surprisingly hard. This just adds the code, subsequent patches will change the existing users of line_read() to the new implementation. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Don't create extraneous -.s fileDavid Gibson2022-06-181-1/+1
| | | | | | | | | | In order to probe availability of certain features the Makefile test compiles a handful of tiny snippets, feeding those in from stdin. However in one case - the one for -fstack-protector - it forgets to redirect the output to stdout, meaning it creates a stray '-.s' file when make is invoked (even make clean). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Tweak $(RM) usageDavid Gibson2022-06-181-3/+3
| | | | | | | | | | | The use of rm commands in the clean and uninstall targets adds an explicit leading - to ignore errors. However the built-in RM variable in make is actually "rm -f" which already ignores errors, so the - isn't neccessary. Also replace ${RM} with $(RM) which is the more conventional form in Makefiles. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Simplify pasta* targets with a pattern ruleDavid Gibson2022-06-181-8/+2
| | | | | | | | pasta, pasta.avx2 and pasta.1 are all generated as a link to the corresponding passt file. We can consolidate the 3 rules for these targets into a single pattern rule. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Use $(BIN) and $(MANPAGES) variable to simplify several targetsDavid Gibson2022-06-181-14/+12
| | | | | | | | | | | | | | There are several places which explicitly list the various generated binaries, even though a $(BIN) variable already lists them. There are several more places that list all the manpage files, introduce a $(MANPAGES) variable to remove that repetition as well. Tweak the generation of pasta.1 as a link to passt.1 so it's not just made as a side effect of the pasta target. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: add passt.1 and qrap.1 to guest files for distro tests] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Makefile: Avoid using wildcard sourcesDavid Gibson2022-06-181-15/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | The passt/pasta Makefile makes fairly heavy use of GNU make's $(wildcard) function to locate the sources and headers to build. Using wildcards for the things to compile is usually a bad idea though: if somehow you end up with a .c or .h file in your tree you didn't expect it can misbuild in an exceedingly confusing way. In particular this can sometimes happen if switching between releases / branches where files have been added or removed without 100% cleaning the tree. It also makes life a bit complicated if building multiple different binaries in the same tree: we already have some rather awkward $(filter-out) constructions to avoid including qrap.c in the passt build. Replace use of $(wildcard) with the more idiomatic approach of defining variables listing all the relevant source files then using that throughout. In the rule for seccomp.h there was also a bare "*.c" which caused make to always rebuild that target. Fix that as well. Similarly, seccomp.sh uses a wildcard to locate the sources, which is unwise for the same reasons. Make it take the sources to examine on the command line instead, and have the Makefile pass them in from the same variables. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Makefile: Suppress unusedStructMember Cppcheck warning in dhcp.cStefano Brivio2022-06-181-0/+2
| | | | | | | | | | | | | | | New from Cppcheck 2.8: all the fields of struct msg that are not directly manipulated are now reported as unused, which is kind of correct as those fields are used as a blob "copied" from request to response and not as separate fields. However, keeping the message composition explicit is probably desirable, and adding inline suppressions makes the whole thing rather unreadable, so just suppress unusedStructMember warnings for dhcp.c, while also adding a suppression for unmatched suppressions to keep earlier versions of Cppcheck happy. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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