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std: implement `hostname`
Resolves https://github.com/rust-lang/libs-team/issues/330
Tracking issue: https://github.com/rust-lang/rust/issues/135142
This is based on rust-lang/rust#135141, but I've reimplemented the UNIX version, which now:
* uses `sysconf(_SC_HOST_NAME_MAX)` as an initial buffer length
* returns `OutOfMemory` if the `Vec` allocation fails
* retries the operation if it detects that the name returned by `gethostname` was truncated
Additionally, as part of the rebase, I had to move some WinSock abstractions (initialisation and error access) to `sys::pal` so that they can be accessed from `sys::net::hostname`.
CC ``@orowith2os`` (and thank you for your work!)
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std::net: update tcp deferaccept delay type to Duration.
See comment [here](https://github.com/rust-lang/rust/issues/119639#issuecomment-2839330337).
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std: make address resolution weirdness local to SGX
Currently, the implementations of `TcpStream::connect` and its cousins take an `io::Result<&SocketAddr>` as argument, which is very weird, as most of them then `?`-try the result immediately to access the actual address. This weirdness is however necessitated by a peculiarity of the SGX networking implementation:
SGX doesn't support DNS resolution but rather accepts hostnames in the same place as socket addresses. So, to make e.g.
```rust
TcpStream::connect("example.com:80")`
```
work, the DNS lookup returns a special error (`NonIpSockAddr`) instead, which contains the hostname being looked up. When `.to_socket_addrs()` fails, the `each_addr` function used to select an address will pass the error to the inner `TcpStream::connect` implementation, which in SGX's case will inspect the error and try recover the hostname from it. If
that succeeds, it continues with the found hostname.
This is pretty obviously a terrible hack and leads to buggy code (for instance, when users use the result of `.to_socket_addrs()` in their own `ToSocketAddrs` implementation to select from a list of possible URLs, the only URL used will be that of the last item tried). Still, without changes to the SGX usercall ABI, it cannot be avoided.
Therefore, this PR aims to minimise the impact of that weirdness and remove it from all non-SGX platforms. The inner `TcpStream::connect`, et al. functions now receive the `ToSocketAddrs` type directly and call `each_addr` (which is moved to `sys::net::connection`) themselves. On SGX, the implementation uses a special `each_addr` which contains the whole pass-hostname-through-error hack.
As well as making the code cleaner, this also opens up the possibility of reusing newly created sockets even if a connection request fails – but I've left that for another PR.
CC `@raoulstrackx`
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Add socket extensions for cygwin
r? `@joboet`
* Abstract name uds addr
* quickack
* passcred
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Migrate the standard library from using the external `cfg_if` crate to
using the now-built-in `cfg_select` macro.
This does not yet eliminate the dependency from
`library/std/Cargo.toml`, because while the standard library itself no
longer uses `cfg_if`, it also incorporates the `backtrace` crate, which
does.
Migration assisted by the following vim command (after selecting the
full `cfg_if!` invocation):
```
'<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e
```
This is imperfect, but substantially accelerated the process. This
prompts for confirmation on the `} else {` since that can also appear
inside one of the arms. This also requires manual intervention to handle
any multi-line conditions.
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std::net: adding `unix_socket_exclbind` feature for solaris/illumos.
allows to have a tigher control over the binding exclusivness of the socket.
ACP: https://github.com/rust-lang/libs-team/issues/366
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https://github.com/rust-lang/rust/issues/139956
fix
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allows to have a tigher control over the binding exclusivness of the
socket.
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Fix std build for all NuttX targets. It is the single largest set of
failures on <https://does-it-build.noratrieb.dev/>. Although, ESP-IDF
also requires these same gates, there are other issues for those
targets.
This can verified be running `x check library/std --target=` for all
NuttX targets.
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Signed-off-by: Ookiineko <chiisaineko@protonmail.com>
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Signed-off-by: Ookiineko <chiisaineko@protonmail.com>
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Use `std::mem::{size_of, size_of_val, align_of, align_of_val}` from the
prelude instead of importing or qualifying them.
These functions were added to all preludes in Rust 1.80.
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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conversion functions
Having these implementation available crate-wide means that platforms not using sockets for their networking code have to stub out the libc definitions required to support them. This PR moves the conversions to private helper functions that are only available where actually needed.
I also fixed the signature of the function converting from a C socket address to a Rust one: taking a reference to a `sockaddr_storage` resulted in unsound usage inside `LookupHost::next`, which could create a reference to a structure smaller than `sockaddr_storage`. Thus I've replaced the argument type with a pointer and made the function `unsafe`.
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As per #117276, this PR moves `sys_common::net` and the `sys::pal::net` into the newly created `sys::net` module. In order to support #135141, I've moved all the current network code into a separate `connection` module, future functions like `hostname` can live in separate modules.
I'll probably do a follow-up PR and clean up some of the actual code, this is mostly just a reorganization.
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