libubox/usock.c, branch master

usock: implement RFC 8305 Happy Eyeballs for usock_inet_timeout()

2026-02-13T09:02:57Z

Replace the two-slot (one v6 + one v4) connection attempt logic with a multi-address interleaved approach per RFC 8305: - Collect all resolved addresses and interleave them by family (v6 first, then alternating v4/v6) using up to 8 candidates - Stagger connection attempts with 250ms delay between each - On connection error (SO_ERROR), immediately remove the failed socket and continue with remaining candidates - First successful connection wins; all other sockets are closed This handles hosts with multiple addresses per family, which the previous code discarded. Fixes: https://github.com/openwrt/uclient/issues/8 Signed-off-by: Felix Fietkau

usock: fix timeout handling in usock_inet_timeout()

2026-02-13T09:02:45Z

Replace relative timeout arithmetic with an absolute CLOCK_MONOTONIC deadline computed once at function entry. This avoids the case where the IPv6 head-start delay subtraction produces a negative timeout for the subsequent combined poll, causing it to return immediately. Also give IPv6 a head start of min(300ms, remaining_timeout) instead of skipping the head start entirely when the total timeout is <= 300ms. Signed-off-by: Felix Fietkau

usock: check SO_ERROR after poll in usock_inet_timeout()

2026-02-13T09:02:45Z

After poll() returns with POLLOUT on a non-blocking connect, the connection may have failed (ECONNREFUSED, ENETUNREACH, etc.). Check the socket error via getsockopt(SO_ERROR) before accepting the connection as successful. Without this, a fast-failing IPv6 connection would be returned to the caller instead of falling back to IPv4. Signed-off-by: Felix Fietkau

usock: fix poll return code check

2023-03-08T08:38:55Z

errno needs to be compared against EINTR/EAGAIN instead of the return code, and only if the return code is < 0. Signed-off-by: Felix Fietkau

usock: implement usock_inet_timeout() with RFC6555 support

2016-01-28T11:07:25Z

Signed-off-by: Felix Fietkau

usock: add usock_inet, which returns the remote address

2016-01-15T20:04:16Z

Signed-off-by: Felix Fietkau

usock: set socket flags right after creating it

2015-01-15T12:10:58Z

Otherwise some flags like USOCK_NONBLOCK wouldn't work as expected (O_NONBLOCK affects connect behavior). Signed-off-by: RafaÅ‚ MiÅ‚ecki

usock: add helper waiting for socket to be ready

2015-01-15T12:10:49Z

Signed-off-by: RafaÅ‚ MiÅ‚ecki

usock: add usock_port() for convenient use of numeric ports

2014-09-23T10:01:00Z

Add a new helper function usock_port() which converts the given numeric port number into a string using a private static buffer. This way a calling application can conveniently use numeric port arguments without having to convert them before: int fd = usock(USOCK_UDP, "example.org", usock_port(80)); Signed-off-by: Jo-Philipp Wich

add license headers for usock

2013-01-13T14:27:38Z

Signed-off-by: Felix Fietkau