Skip to content

listen: set IP_FREEBIND so binding to a not-yet-present address works #27

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
DevenDucommun wants to merge 1 commit into
base: master
Choose a base branch
from
+18 −0
Open

listen: set IP_FREEBIND so binding to a not-yet-present address works #27

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 18 additions & 0 deletions listen.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -169,6 +169,24 @@ int uh_socket_bind(const char *host, const char *port, bool tls)
goto error;
}

/*
* Allow binding to an address that is not (yet) assigned to a
* local interface. Without this, starting before the network is
* fully configured makes bind() fail with EADDRNOTAVAIL when a
* specific listen address is used, and uhttpd never recovers.
* Best effort: ignore failures so older kernels keep working.
*/
#if defined(IP_FREEBIND)
if (p->ai_family == AF_INET &&
setsockopt(sock, IPPROTO_IP, IP_FREEBIND, &yes, sizeof(yes)) < 0)
perror("setsockopt(IP_FREEBIND)");
#endif
#if defined(IPV6_FREEBIND)
if (p->ai_family == AF_INET6 &&
setsockopt(sock, IPPROTO_IPV6, IPV6_FREEBIND, &yes, sizeof(yes)) < 0)
perror("setsockopt(IPV6_FREEBIND)");
#endif

/* bind */
if (bind(sock, p->ai_addr, p->ai_addrlen) < 0) {
perror("bind()");
Expand Down