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libc: support connect(..AF_UNSPEC..) on UDP sockets

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A 'connect' with AF_UNSPEC dissolves address association in order to
re-connect to another address.

Issue #5031
This commit is contained in:
Sebastian Sumpf 2023-10-10 20:39:25 +02:00 committed by Christian Helmuth
parent cf43e0c3da
commit 5261fe626d
1 changed files with 21 additions and 2 deletions
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23
repos/libports/src/lib/libc/socket_fs_plugin.cc
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@ -122,7 +122,7 @@ struct Libc::Socket_fs::Context : Plugin_context
enum Proto { TCP, UDP };
enum State { UNCONNECTED, ACCEPT_ONLY, CONNECTING, CONNECTED, CONNECT_ABORTED };
enum State { UNCONNECTED, ACCEPT_ONLY, CONNECTING, CONNECTED, CONNECT_ABORTED, UNSPEC };
/* TODO remove */
struct Inaccessible { }; /* exception */
@ -300,6 +300,9 @@ struct Libc::Socket_fs::Context : Plugin_context
if (strcmp(connect_status, "not connected") == 0)
return Errno(ENOTCONN);
if (strcmp(connect_status, "package not installed") == 0)
return Errno(ENOTSUP);
error("socket_fs: unhandled connection state");
return Errno(ECONNREFUSED);
}
@ -386,7 +389,7 @@ template <int CAPACITY> class Libc::Socket_fs::String
*/
struct Libc::Socket_fs::Sockaddr_string : String<NI_MAXHOST + NI_MAXSERV>
{
Sockaddr_string() { }
Sockaddr_string() { stpcpy(base(), ";0"); }
Sockaddr_string(Host_string const &host, Port_string const &port)
{
@ -677,6 +680,10 @@ extern "C" int socket_fs_connect(int libc_fd, sockaddr const *addr, socklen_t ad
switch (addr->sa_family) {
case AF_UNSPEC:
if (context->state() != Context::CONNECTED)
return 0;
context->state(Context::UNSPEC); /* reset */
break;
case AF_INET:
break;
default:
@ -684,6 +691,18 @@ extern "C" int socket_fs_connect(int libc_fd, sockaddr const *addr, socklen_t ad
}
switch (context->state()) {
case Context::UNSPEC:
{
Sockaddr_string addr_string { };
int const len = ::strlen(addr_string.base());
int const n = write(context->connect_fd(), addr_string.base(), len);
if (n != len) return Errno(ECONNREFUSED);
context->state(Context::UNCONNECTED);
return 0;
}
case Context::UNCONNECTED:
{
Sockaddr_string addr_string;