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path: root/methods/connect.cc
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2018-01-03Correctly report transient errors againJulian Andres Klode
Commit 47c0bdc310c8cd62374ca6e6bb456dd183bdfc07 ("report transient errors as transient error") accidentally changed some connection failures to become non-transient, because the result of the error checks where being ignored and then fatal error was returned if an error was pending - even if that error was trivial. After the merge of pu/happy-eyeballs2a this becomes a lot clearer, and easy to fix. Gbp-Dch: ignore Regression-Of: 47c0bdc310c8cd62374ca6e6bb456dd183bdfc07
2018-01-03Add rapid "happy eyeballs" connection fallback (RFC 8305)Julian Andres Klode
Try establishing connections in alternating address families in rapid intervals of 250 ms, adding more connections to the wait list until one succeeds (RFC 8305, happy eyeballs 2). It is important that WaitAndCheckErrors() waits until it has a successful connection, a time out, or all connections failed - otherwise the timing between tries might be wrong, and the final long wait might exit early because one connection failed without trying the others. Timing wise, this only works correctly on Linux, as select() counts down there. But we rely on that in some other places too, so this is not the time to fix that. Timeouts are only reported in the final long wait - the short inner waits are expected to time out more often, and multiple times, we do not want to report them. Closes: #668948 LP: #1308200 Gbp-Dch: paragraph
2018-01-03connect: Extract Connection::CheckError() methodJulian Andres Klode
Extracting the error checking method allows us to reuse it in different places, so we can move the waiting and checking out of DoConnect() eventually. Gbp-Dch: ignore
2018-01-03connect: Store the IP used when picking a connectionJulian Andres Klode
There's no real point in storing the IP address while resolving it - failure messages include the IP address in any case. Do this when picking the connection for actual use instead.
2018-01-03connect: Extract a Connection structJulian Andres Klode
This struct holds information about a connection attempt, like the addrinfo, the resolved address, the fd for the connection, and so on. Gbp-Dch: ignore
2018-01-03connect: Alternate address families for addressesJulian Andres Klode
As a first step to implementing Happy Eyeballs version 2, we need to order the list of hosts getaddrinfo() gave us so it alternates between preferred and other address families. RFC: https://tools.ietf.org/html/rfc8305 Gbp-Dch: ignore
2017-12-13report transient errors as transient errorsDavid Kalnischkies
The Fail method for acquire methods has a boolean parameter indicating the transient-nature of a reported error. The problem with this is that Fail is called very late at a point where it is no longer easily identifiable if an error is indeed transient or not, so some calls were and some weren't and the acquire system would later mostly ignore the transient flag and guess by using the FailReason instead. Introducing a tri-state enum we can pass the information about fatal or transient errors through the callstack to generate the correct fails.
2017-09-26proper error reporting for v3 onion servicesDavid Kalnischkies
APT connects just fine to any .onion address given, only if the connect fails somehow it will perform checks on the sanity of which in this case is checking the length as they are well defined and as the strings are arbitrary a user typing them easily mistypes which apt should can be slightly more helpful in figuring out by saying the onion hasn't the required length.
2017-07-12Reformat and sort all includes with clang-formatJulian Andres Klode
This makes it easier to see which headers includes what. The changes were done by running git grep -l '#\s*include' \ | grep -E '.(cc|h)$' \ | xargs sed -i -E 's/(^\s*)#(\s*)include/\1#\2 include/' To modify all include lines by adding a space, and then running ./git-clang-format.sh.
2017-07-03don't set ip addresses as server names for SNIDavid Kalnischkies
It is kinda unlikely that apt will ever encounter a certificate for an IP and a user actually using it, but the API documentation for gnutls_server_name_set explicitly says that "IPv4 or IPv6 addresses are not permitted to be set by this function.", so we should follow it. [jak@d.o: Slightly rebased]
2017-07-03Swap file descriptors before the handshakeJulian Andres Klode
This makes more sense. If the handshake failed midway, we still should run the gnutls bye stuff. The thinking here is to only set the fd after the session setup, as we do not modify it before, so if it fails in session setup, you retain a usable file descriptor. Gbp-Dch: ignore
2017-07-03Do not error out, only warn if ca certificates are not availableJulian Andres Klode
This probably makes more sense if Verify-Peer is set to off.
2017-07-03tls: Add more details to error messages, and detect more errorsJulian Andres Klode
This should make it easier to figure out what was going on.
2017-07-01Make Verify-Host and Verify-Peer independent againJulian Andres Klode
We can actually just pass null as a hostname, so let's just do that when Verify-Host is set to false.
2017-06-30TLS support: Error out on unsupported curl optionsJulian Andres Klode
Silently ignoring the options might be a security issue, so produce an error instead.
2017-06-30Improve closing the TLS connectionJulian Andres Klode
If gnutls_session_bye() exited with an error, we never closed the underlying file descriptor, causing the method to think the connection was still open. This caused problems especially in test-partial-file-support where we checked that a "complete" file and an incomplete file work. The first GET returns a 416 with Connection: close, and the next GET request then accidentally reads the body of the 416 as the header for its own request.
2017-06-30Allow running the TLS stack on any lower connectionJulian Andres Klode
This is especially needed if we use an HTTPS proxy to CONNECT to an HTTPS URI, as we run TLS-inside-TLS then.
2017-06-30Reset failure reason when connection was successfulJulian Andres Klode
When APT was trying multiple addresses, any later error somewhere else would be reported with ConnectionRefused or ConnectionTimedOut as the FailReason because that was set by early connect attempts. This causes APT to handle the failures differently, leading to some weirdly breaking test cases (like the changed one). Add debugging to the previously failing test case so we can find out when something goes wrong there again.
2017-06-30Don't read CaInfo if not specified (missing else)Julian Andres Klode
This fixes a regression from ~alpha2. Closes: #866559 Gbp-Dch: Full
2017-06-29http: Only use system CA store if CaInfo is not setJulian Andres Klode
It turns out that curl only sets the system trust store if the CaInfo option is not set, so let's do the same here.
2017-06-29Improve error message if system CA store is emptyJulian Andres Klode
Tell the user to install ca-certificates. Closes: #866377
2017-06-29use port from SRV record instead of initial portDavid Kalnischkies
An SRV record includes a portnumber to use with the host given, but apt was ignoring the portnumber and instead used either the port given by the user for the initial host or the default port for the service. In practice the service usually runs on another host on the default port, so it tends to work as intended and even if not and apt can't get a connection there it will gracefully fallback to contacting the initial host with the right port, so its a user invisible bug most of the time.
2017-06-28Introduce Acquire::AllowTLS to turn off TLS supportJulian Andres Klode
As requested by Henrique de Moraes Holschuh, here comes an option to disable TLS support. If the option is set to false, the internal TLS layer is disabled.
2017-06-28methods: http: Drain pending data before selectingJulian Andres Klode
GnuTLS can already have data pending in its buffers, we need to to drain that first otherwise select() might block indefinitely. Gbp-Dch: ignore
2017-06-28methods: Add HTTPS support to http method, using GnuTLSJulian Andres Klode
The http method will eventually replace the curl-based https method, but for now, this is an opt-in experiment that can be enabled by setting Dir::Bin::Methods::https to "http". Known issues: - We do not support HTTPS proxies yet - We do not support proxying HTTPS connections yet (CONNECT) - IssuerCert and SslForceVersion are unsupported Gbp-Dch: Full
2017-06-28methods: connect: Switch from int fds to new MethodFdJulian Andres Klode
Use std::unique_ptr<MethodFd> everywhere we used an integer-based file descriptor before. This allows us to implement stuff like TLS support easily. Gbp-Dch: ignore
2017-06-28methods: connect: Change PkgAcqMethod to aptMethodJulian Andres Klode
This will allow us to access ConfigFind() and stuff which makes it possible for us to implement TLS support. Gbp-Dch: ignore
2016-09-04abort connection on '.' target replies in SRVDavid Kalnischkies
Commit 3af3ac2f5ec007badeded46a94be2bd06b9917a2 (released in 1.3~pre1) implements proper fallback for SRV, but that works actually too good as the RFC defines that such an SRV record should indicate that the server doesn't provide this service and apt should respect this. The solution is hence to fail again as requested even if that isn't what the user (and perhaps even the server admins) wanted. At least we will print a message now explicitly mentioning SRV to point people in the right direction. Reported-In: https://bugs.kali.org/view.php?id=3525 Reported-By: Raphaël Hertzog
2016-08-26methods/connect.cc: Only use AI_IDN if definedJulian Andres Klode
Gbp-Dch: ignore
2016-08-11block direct connections to .onion domains (RFC7687)David Kalnischkies
Doing a direct connect to an .onion address (if you don't happen to use it as a local domain, which you shouldn't) is bound to fail and does leak the information that you do use Tor and which hidden service you wanted to connect to to a DNS server. Worse, if the DNS is poisoned and actually resolves tricking a user into believing the setup would work correctly… This does block also the usage of wrappers like torsocks with apt, but with native support available and advertised in the error message this shouldn't really be an issue. Inspired-by: https://bugzilla.mozilla.org/show_bug.cgi?id=1228457
2016-07-06keep trying with next if connection to a SRV host failedDavid Kalnischkies
Instead of only trying the first host we get via SRV, we try them all as we are supposed to and if that isn't working we try to connect to the host itself as if we hadn't seen any SRV records. This was already the intend of the old code, but it failed to hide earlier problems for the next call, which would unconditionally fail then resulting in an all around failure to connect. With proper stacking we can also keep the error messages of each call around (and in the order tried) so if the entire connection fails we can report all the things we have tried while we discard the entire stack if something works out in the end.
2016-01-05Do not remove a not working SrvRecords server twiceMichael Vogt
The PopFromSrvRecs() already removed the entry from the active list, so the extra SrvRecords.erase() was incorrect. Git-Dch: ignore
2015-11-05activate AI_IDN by default to support IDN domainsDavid Kalnischkies
AI_IDN is a glibc extension, but we can worry about this at the time actually anyone is seriously trying apt on non-glibc systems. Closes: 763437
2015-11-04allow getaddrinfo flag AI_ADDRCONFIG to be disabledDavid Kalnischkies
This flags is generally handy to avoid having to deal with ipv6 results on an ipv4-only system, but it prevents e.g. the testcases from working if the testsystem has no configured address at the moment (expect loopback), so allow it to be sidestepped and let the testcases sidestep it. Git-Dch: Ignore
2015-08-31fix some unused parameter/variable warningsDavid Kalnischkies
Reported-By: gcc Git-Dch: Ignore
2015-08-24Fix typoMichael Vogt
Thanks: Julian Andres Klode Git-Dch: ignore
2015-08-20Add basic (non weight adjusted) shuffling for SrvRecords selectionMichael Vogt
Also add "Debug::Acquire::SrvRecs" debug option and the option "Acquire::EnableSrvRecods" to allow disabling this lookup.
2015-08-18cleanupMichael Vogt
2014-05-23when using srv records, use the next server if one fails to connectMichael Vogt
2014-05-22WIP make connect use GetSrvRecordsMichael Vogt
2014-03-13cleanup headers and especially #includes everywhereDavid Kalnischkies
Beside being a bit cleaner it hopefully also resolves oddball problems I have with high levels of parallel jobs. Git-Dch: Ignore Reported-By: iwyu (include-what-you-use)
2014-01-16correct some style/performance/warnings from cppcheckDavid Kalnischkies
The most "visible" change is from utime to utimensat/futimens as the first one isn't part of POSIX anymore. Reported-By: cppcheck Git-Dch: Ignore
2013-03-25* methods/connect.cc:Michael Vogt
- use Errno() instead of strerror(), thanks to David Kalnischk
2013-03-22add new config options "Acquire::ForceIPv4" and Michael Vogt
"Acquire::ForceIPv6" to allow focing one or the other (closes: #611891)
2013-03-21merge patch from Colin to fix error message from getaddrinfo() (#703603)Michael Vogt
2011-09-19use forward declaration in headers if possible instead of includesDavid Kalnischkies
2011-09-19do not pollute namespace in the headers with using (Closes: #500198)David Kalnischkies
2011-09-13reorder includes: add <config.h> if needed and include it at firstDavid Kalnischkies
2010-04-14merged from lp:~mvo/apt/mvoMichael Vogt
2010-04-14Remember hosts with general failures forMichael Vogt
https://wiki.ubuntu.com/NetworklessInstallationFixes (LP: #556831).