merge socket constants #647

ndusart · 2017-07-05T18:42:39Z

Refactor the constant declarations such that all constants are only declared once with a #[cfg] that only enables the constant on the correct platforms.

Closes #637

(same PR as #646 but from another branch, to see if buildbot has a problem with PR made from master branch)

Susurrus

There are a ton of constants here that are available on more platforms than are specified. I went through most of them, but I'd appreciate if you double-checked all of them and exposed them on all platforms as well.

Susurrus · 2017-07-06T14:45:41Z

src/sys/socket/consts.rs

@@ -93,11 +277,16 @@ mod os {
        pub flags MsgFlags: libc::c_int {
            MSG_OOB,
            MSG_PEEK,
+            MSG_DONTWAIT,
+            #[cfg(not(target_os = "dragonfly"))]
            MSG_CTRUNC,


MSG_CTRUNC, MSG_EOR, and MSG_TRUNC are all available in libc for DragonflyBSD.

Susurrus · 2017-07-06T14:48:37Z

src/sys/socket/consts.rs

+              target_os = "ios",
+              target_os = "openbsd",
+              target_os = "netbsd"))]
+    pub const SO_USELOOPBACK: c_int = libc::SO_USELOOPBACK;


This exists on DragonflyBSD as well.

Susurrus · 2017-07-06T14:49:24Z

src/sys/socket/consts.rs

+              target_os = "ios",
+              target_os = "openbsd",
+              target_os = "netbsd"))]
+    pub const SO_NOSIGPIPE: c_int = 0x1022;


This is defined for macos and ios

Susurrus · 2017-07-06T14:49:43Z

src/sys/socket/consts.rs

+              target_os = "ios",
+              target_os = "openbsd",
+              target_os = "netbsd"))]
+    pub const SO_NOADDRERR: c_int = 0x1023;


Defined for macos/ios

Susurrus · 2017-07-06T14:50:05Z

src/sys/socket/consts.rs

+              target_os = "ios",
+              target_os = "openbsd",
+              target_os = "netbsd"))]
+    pub const SO_NWRITE: c_int = 0x1024;


defined for macos/ios

Susurrus · 2017-07-06T14:51:02Z

src/sys/socket/consts.rs

    pub const SO_PEEK_OFF: c_int = libc::SO_PEEK_OFF;
+    #[cfg(any(target_os = "linux", target_os = "android"))]
    pub const SO_PEERCRED: c_int = libc::SO_PEERCRED;


Also supported by openbsd, bitrig, and haiku.

Susurrus · 2017-07-06T14:52:03Z

src/sys/socket/consts.rs


    pub const SOCK_STREAM: c_int = libc::SOCK_STREAM;
    pub const SOCK_DGRAM: c_int = libc::SOCK_DGRAM;
    pub const SOCK_SEQPACKET: c_int = libc::SOCK_SEQPACKET;
    pub const SOCK_RAW: c_int = libc::SOCK_RAW;
+    #[cfg(not(any(target_os = "linux", target_os = "android")))]
+    pub const SOCK_RDM: c_int = libc::SOCK_RDM;


Supported on netbsd, freebsd, dragonfly, mac, ios.

I wrote the #[cfg] in an exclusive manner as it's shorter (there is a not()).
I'll use an inclusive form for matching the other #[cfg]

Ahh, yes, missed that, sorry. But it is a good idea to use a whitelist and not a blacklist, as we'll be adding new platforms moving forward and they'll be more robust to these additions (though unfortunately likely more verbose).

Susurrus · 2017-07-06T14:56:16Z

There are also 27 constants here that need to be upstreamed for all supported platforms. I'd love to have that work be done and merged in with this PR so we can have all of these constants defined correctly in libc and reused here. Would you be willing to do that work as part of this or is that too much to ask?

ndusart · 2017-07-06T17:10:07Z

I could find the time for this :-)

Just a bit confused where I could find sys/ headers for BSD platforms. For other I have running machines where I can find them.

Susurrus · 2017-07-06T17:15:08Z

Excellent, we'd very much appreciate it. We have a huge backlog of FFI constants and functions that aren't correct across all platforms, and it'd be awesome to get better cross-platform support by upstreaming proper values.

I documented this in an old PR of mine: rust-lang/libc#625. I keep meaning to add that to the libc docs so that new users can more easily add missing constants, but I haven't had the time yet.

asomers · 2017-07-06T21:11:35Z

@ndusart you'll have to go straight to the source. libc is built against the most recent releases of each of the BSDs. Here are some links you might find helpful:

ndusart · 2017-07-06T21:25:58Z

Thanks for the links.

@Susurrus I made the proposed change, thanks for the listing.

I added some marker comments beside the symbols I'd like to check. It'll be cleaned, it's just for helping me tracking the progress.

ndusart · 2017-07-06T21:29:39Z

src/sys/socket/consts.rs

            MSG_EOR,
-            #[cfg(any(target_os = "linux", target_os = "android"))]


Damn, was reading as a blacklist there, and seeing the symbols defined for them I removed it. Should definitely use the same form for all #[cfg] ^^

ndusart · 2017-07-07T13:57:44Z

Worked a bit on this now.

I can find SO_DONTTRUNC reference only in MacOS source, it's not present on other BSD platforms. Currently we present this constant for all BSD except netbsd and dragonfly. That match the fact that this constant is defined in libc only for Apple architectures.

SO_LABEL seems to be only defined in freebsd, macos and ios. As of now, we present it for all BSD except dragonfly.

SO_NREAD and SO_NKE seem to only be defined in macos and ios. Now, we present it for all BSD except dragonfly.

SO_NOSIGPIPE does not seem to be defined for openbsd and netbsd. It appears in some source files, but I think this files are written with cross-platform compatibility in mind and there is some #ifdef somewhere to not include that part of the code on this architectures.

SO_NOADDRERR does not seem to be defined for openbsd, netbsd and freebsd.

That's how far I get for now.

I'd like to know how to handle these cases, should we remove them or keep them for not breaking the API ?
Maybe I'm wrong and I didn't look correctly, please correct me if it is the case.

Susurrus · 2017-07-07T15:07:07Z

@ndusart One of the reasons we're upstreaming constants is because most of nix's declarations were not correct across all supported platforms, especially as it's been supporting more platforms. So it doesn't surprise me that his many constants are improperly declared in nix. I have no concern of breaking the API in nix when it's correct to do so because at the end of the day if someone used those constants on platforms they didn't exist on and get undefined behavior, it'd eventually come back as a bug report to nix.

ndusart · 2017-07-09T16:24:32Z

I have some difficulties with three constants for macos and ios:

SO_RESTRICTIONS
SO_RESTRICT_DENYIN (became SO_RESTRICT_DENY_IN since Mac OS 10.9)
SO_RESTRICT_DENYOUT (became SO_RESTRICT_DENY_OUT since Mac OS 10.9)

There are defined here: https://github.com/opensource-apple/xnu/blob/dc0628e187c3148723505cf1f1d35bb948d3195b/bsd/sys/socket.h#L188-L190

But cannot make libc CI find these constants. The header was well included and PRIVATE was defined but no luck.

Should we keep them hardcoded ? The values are correct. (Just SO_RESTRICT_DENYSET which was removed since 10.9)

Susurrus · 2017-07-09T16:40:55Z

Those constants don't actually exist on Mac as of 10.11.6 (I have one locally). I did grep SO_RESTRICT -r /usr/include and turned up nothing. Additionally I looked through /usr/include/sys/socket.h and those values are gone. They shouldn't be added to libc for macos and ios and be excluded in nix as well.

Susurrus · 2017-07-09T18:35:57Z

src/sys/socket/consts.rs

@@ -1,75 +1,253 @@
 pub use self::os::*;

-#[cfg(any(target_os = "linux", target_os = "android"))]
 mod os {


I don't think we need this os module anymore since all constants are now included individually.

Sure, I'll remove this

Susurrus · 2017-07-09T18:37:35Z

src/sys/socket/consts.rs

@@ -1,75 +1,253 @@
 pub use self::os::*;

-#[cfg(any(target_os = "linux", target_os = "android"))]
 mod os {
    use libc::{self, c_int, uint8_t};

    pub const AF_UNIX: c_int  = libc::AF_UNIX;


Does it make sense to group any of these values together into enums?

Is not that already done in the nix::sys::socket::addr module ?
Specifically AF_* are grouped in the AddressFamily enum.

I'm wondering then if this consts module should not be removed completely in favor of libc ?

It definitely should. All constants should be declared in libc and we should just wrap them up into nicer types. It looks like that's already done for the AF_* constants, but it should be done for these other ones as well.

ndusart · 2017-07-10T09:26:29Z

AF_* constants are in AddressFamily enum.
SOCK_* constants are defined in SockType enum.
SOL_* and IPPROTO_* are defined in SockLevel enum. (IPPROTO_* seem to be preferred over SOL_*, SockLevel correctly use these when applicable)

The constants that are not being defined in an enum are the socket options constants: SO_*, IP_* or TCP_* (maybe other depending on the protocol level of the option), but structs are built around them in sockopts.rs so we have sort of an "higher-level type" for these constants.

My last commit remove the consts module and tests are passing on linux (x86_64) when I use my branch of libc where I added the missing definitions (rust-lang/libc/pull/656).

add missing socket constants Add some missing socket constants that are hardcoded by `nix` (nix-rust/nix#647) I took the opportunity to merge some constants in a upper module when applicable.

Susurrus · 2017-07-10T18:37:52Z

src/sys/socket/addr.rs

@@ -702,7 +702,7 @@ pub mod sys_control {
            let addr = sockaddr_ctl {
                sc_len: mem::size_of::<sockaddr_ctl>() as c_uchar,
                sc_family: AddressFamily::System as c_uchar,
-                ss_sysaddr: consts::AF_SYS_CONTROL as uint16_t,


This is defined as a c_int, is sockaddr_ctl correct or is libc wrong on the datatype?

sockaddr_ctl is correctly defined. It's defined in macos here, ss_sysaddr is indeed u_int16_t.

I do not know if AF_SYS_CONTROL is used anywhere else.
We could still make that change in libc as it has not been released yet.

Can you file a PR with upstream then? Seems like AF_SYS_CONTROL should be a u16, do you agree?

I definitely agree. I'll be able to do that tomorrow.

Looking at the headers it looks like the value is used as multiple datatypes. This might not be super straightforward.

I don't think AF_SYS_CONTROL should be considered as the same type as other AF_* constants. You'll not use it in socket function for example, there you should use AF_SYSTEM. AF_SYS_CONTROL seems like a subtype to AF_SYSTEM that only appear in sockaddr_ctl when connecting to the socket.
But you are right, AF_* constants are used sometimes as int (in socket function) or as sa_family_t (in sockaddr struct).
I guess the problem is not applicable to AF_SYS_CONTROL but I cannot find good documentation about its use though :/

So I think this is resolved as a WONTFIX on our end then.

Not sure. AF_SYS_CONTROL does not seem to be used in other way than as u16 but I never used these AF_SYSTEM addresses, so in doubt, probably it's better to let it as c_int ?

Susurrus · 2017-07-11T16:25:05Z

src/sys/socket/sockopt.rs

-sockopt_impl!(Both, SndBuf, consts::SOL_SOCKET, consts::SO_SNDBUF, usize);
+sockopt_impl!(Both, TcpKeepIdle, libc::IPPROTO_TCP, libc::TCP_KEEPIDLE, u32);
+sockopt_impl!(Both, RcvBuf, libc::SOL_SOCKET, libc::SO_RCVBUF, usize);
+sockopt_impl!(Both, SndBuf, libc::SOL_SOCKET, libc::SO_SNDBUF, usize);
 #[cfg(target_os = "linux")]


I think this and SndBufForce can be implemented on Android as well.

You're right and SndBufForce is defined in Linux ARM too.

Susurrus · 2017-07-11T16:32:15Z

src/sys/socket/sockopt.rs

-sockopt_impl!(SetOnly, SndBufForce, consts::SOL_SOCKET, consts::SO_SNDBUFFORCE, usize);
-sockopt_impl!(GetOnly, SockType, consts::SOL_SOCKET, consts::SO_TYPE, super::SockType);
+sockopt_impl!(SetOnly, SndBufForce, libc::SOL_SOCKET, libc::SO_SNDBUFFORCE, usize);
+sockopt_impl!(GetOnly, SockType, libc::SOL_SOCKET, libc::SO_TYPE, super::SockType);
 #[cfg(any(target_os = "freebsd",


I think this is available on all targets, why don't you just remove the cfg attribute and we'll see if everything passes.

Susurrus · 2017-07-11T16:36:00Z

src/sys/socket/mod.rs

+// Flags for send/recv and their relatives
+libc_bitflags!{
+    pub flags MsgFlags: libc::c_int {
+        MSG_OOB,


Can you add doc comments for each of these? They're documented here.

Susurrus · 2017-07-16T23:43:02Z

src/sys/socket/addr.rs

    #[cfg(any(target_os = "macos", target_os = "ios"))]
-    System = consts::AF_SYSTEM,
+    System = libc::AF_SYSTEM,


There are actually a ton more AF_ constants defined, at least on Linux. If you search through the libc source, you'll find a bunch, would you be willing to add them for the appropriate platforms?

Ok, I'll go through the constants defined in libc and try to merge all them in here.

ndusart · 2017-07-17T08:24:37Z

Travis is compiling libc 0.2.26 instead if the upstream master branch. Then it's complaining about missing constants that are not released yet.
Do you know why it keeps this version ?

Wolvereness · 2017-07-17T08:58:54Z

@ndusart This commit is being merged: 5527ce8, which changes the version in the Cargo.toml to rust-lang/libc@288942e, and it doesn't include the changes you need. You need to rebase on current master, because 3912a20 (your upstream) is before the previously mentioned commit, and then change the dependency back.

Basically, same thing I had to do: 7b21417

Edit: of note, I added the last line, and I did change the libc link to the v0.2.26 commit instead of v0.2.25.

ndusart · 2017-07-17T09:27:02Z

Thanks @Wolvereness.
I thought CI was testing against the head of the source branch of the PR. (It seems it's the case for buildbot as it fetch the master branch of libc)

Looking in Travis CI logs, I see that it fetch the source with

git fetch origin +refs/pull/647/merge

which is the PR merged to master.

I'll rebase then on master so I can modify libc dependency with a new commit.

ndusart · 2017-07-26T09:05:05Z

I added doc to AddressFamily and SockType.

Regarding the test nix-text/src/const.c, are these tests ever run ? Because tests are passing here while constants are not defined anymore.
Anyway, they can be all removed as they are no socket constant definition in this PR.

Susurrus · 2017-07-26T17:04:39Z

@ndusart Yes, the tests are run. When you run cargo test it compiles and runs nix-test as part of that. It's only if there are tests in /test that depend on stuff implemented in nix-test will you see anything happen. Currently that's not for very much right now.

ndusart · 2017-07-27T08:10:17Z

Well, I think is quite done now. :)
Waiting rust-lang/libc#701 to fix the test failure for s390x, and it should be ok.

Do you have any remark on the current state of this PR ?

ndusart · 2017-07-27T15:35:21Z

Tests should pass now.

Susurrus

Just clean up this one doc comment and I think we're good here!

Susurrus · 2017-07-27T16:01:40Z

src/sys/socket/mod.rs

@@ -70,6 +101,59 @@ bitflags!(
    }
 );

+// Flags for send/recv and their relatives


The doc comment for this should be the first line inside the macro.

ndusart · 2017-07-27T16:13:25Z

Done, and converted these comments into doc comments

Susurrus

Also need some CHANGELOG entries. Under "Added" you should summarize which constants were added. And under "Changed" we have the API changes to socket and socketpair. We don't need to say that we switched to using libc-defined types, since our end users don't care, stick to summarizing things they would care about.

Susurrus · 2017-07-27T16:20:24Z

src/sys/socket/addr.rs

    use ::sys::socket::addr::{AddressFamily};
+    use libc;


This can be fixed by modifying the following line to be use libc::{self, ...

Susurrus · 2017-07-27T16:20:53Z

src/sys/socket/mod.rs

@@ -9,9 +9,9 @@ use libc::{c_void, c_int, socklen_t, size_t, pid_t, uid_t, gid_t};
 use std::{mem, ptr, slice};
 use std::os::unix::io::RawFd;
 use sys::uio::IoVec;
+use libc;


Same with this use, combine it with the previous one.

Susurrus · 2017-07-27T16:22:55Z

src/sys/socket/sockopt.rs

@@ -1,9 +1,8 @@
-use super::{ffi, consts, GetSockOpt, SetSockOpt};
+use super::{ffi, GetSockOpt, SetSockOpt};
+use libc;


Same thing here.

ndusart · 2017-07-27T20:05:41Z

Are these CHANGELOGS entries good ?

I merged the use statements.

Susurrus · 2017-08-01T02:43:22Z

CHANGELOG.md

@@ -34,6 +34,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - On Linux and Android, added support for receiving `PTRACE_O_TRACESYSGOOD`
  events from `wait` and `waitpid` using `WaitStatus::PtraceSyscall`
  ([#566](https://github.com/nix-rust/nix/pull/566)).
+- Added protocol families in `AddressFamily` enum.


These need to be moved above into the "Unreleased" section.

Susurrus · 2017-08-01T02:43:29Z

CHANGELOG.md

@@ -64,6 +66,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  "*_buf" variants also now calculate total array size and take slice references for improved type
  safety. The documentation has also been dramatically improved.
  ([#670](https://github.com/nix-rust/nix/pull/670))
+- Changed function signature of `socket()` and `socketpair()`. The `protocol` argument


Same as above.

Susurrus · 2017-08-01T02:47:28Z

This needs a rebase, and you need to move the CHANGELOG entries when you do that. I'd also prefer that the last commit be merged into the other commits where appropriate instead of being a separate one, but this doesn't need to block merging this.

ndusart · 2017-08-01T07:58:40Z

@Susurrus rebased on master

Susurrus · 2017-08-01T17:39:21Z

Awesome, thanks @ndusart!

bors r+

647: merge socket constants r=Susurrus > Refactor the constant declarations such that all constants are only declared once with a #[cfg] that only enables the constant on the correct platforms. Closes #637 (same PR as #646 but from another branch, to see if buildbot has a problem with PR made from master branch)

bors · 2017-08-01T19:05:55Z

Build succeeded

v0.2.29 adds missing IPPROTO_UDP bindings See: nix-rust/nix#647

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merge socket constants #646

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add missing socket constants rust-lang/libc#656

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ndusart force-pushed the socket-const branch from 1fd39e7 to 73ecb15 Compare July 10, 2017 08:03

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This was referenced Jul 11, 2017

Add support for SO_TIMESTAMP #663

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Add netlink protocol values to socket consts #426

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ndusart force-pushed the socket-const branch from 126cca2 to 138e41d Compare July 17, 2017 08:18

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Fix nix for Dragonfly #684

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ndusart force-pushed the socket-const branch from 5746e46 to b17a3cc Compare July 27, 2017 07:52

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ndusart force-pushed the socket-const branch from b17a3cc to 951a12f Compare July 27, 2017 16:13

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ndusart added 6 commits August 1, 2017 09:46

remove sys::sockets::consts module as it's libc goal to define them

33de2ae

add socket constants already present in libc

3e9a4fc

Document MsgFlags constants

64a5c6f

add SockProtocol type for third argument of socket and socketpair

22b8b33

Document AddressFamily and SockType

b476839

removing socket constants tests in nix-test

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ndusart force-pushed the socket-const branch from f95c207 to c0c8e5e Compare August 1, 2017 07:54

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Support for OpenBSD #688

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ndusart deleted the socket-const branch August 1, 2017 19:54

pronebird pushed a commit to mullvad/pfctl-rs that referenced this pull request Aug 15, 2017

Update minimum requirement for libc to 0.2.29

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v0.2.29 adds missing IPPROTO_UDP bindings See: nix-rust/nix#647

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Update minimum requirement for libc to 0.2.29 mullvad/pfctl-rs#25

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		MSG_EOR,
		#[cfg(any(target_os = "linux", target_os = "android"))]

merge socket constants #647

merge socket constants #647

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