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Fix handling of hostname with multiple candidate IP addresses when using alternate ports

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This commit is contained in:
Cameron Gutman 2021-08-14 12:30:04 -05:00
parent a290ec032b
commit 5b2cf1b8f7
1 changed files with 26 additions and 5 deletions
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31
src/Connection.c
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@ -326,12 +326,33 @@ int LiStartConnection(PSERVER_INFORMATION serverInfo, PSTREAM_CONFIGURATION stre
Limelog("Resolving host name...");
ListenerCallbacks.stageStarting(STAGE_NAME_RESOLUTION);
err = resolveHostName(serverInfo->address, AF_UNSPEC, 47984, &RemoteAddr, &RemoteAddrLen);
if (err != 0) {
err = resolveHostName(serverInfo->address, AF_UNSPEC, 47989, &RemoteAddr, &RemoteAddrLen);
LC_ASSERT(RtspPortNumber != 0);
if (RtspPortNumber != 48010) {
// If we have an alternate RTSP port, use that as our test port. The host probably
// isn't listening on 47989 or 47984 anyway, since they're using alternate ports.
err = resolveHostName(serverInfo->address, AF_UNSPEC, RtspPortNumber, &RemoteAddr, &RemoteAddrLen);
if (err != 0) {
// Sleep for a second and try again. It's possible that we've attempt to connect
// before the host has gotten around to listening on the RTSP port. Give it some
// time before retrying.
PltSleepMs(1000);
err = resolveHostName(serverInfo->address, AF_UNSPEC, RtspPortNumber, &RemoteAddr, &RemoteAddrLen);
}
}
if (err != 0) {
err = resolveHostName(serverInfo->address, AF_UNSPEC, 48010, &RemoteAddr, &RemoteAddrLen);
else {
// We use TCP 47984 and 47989 first here because we know those should always be listening
// on hosts using the standard ports.
//
// TCP 48010 is a last resort because:
// a) it's not always listening and there's a race between listen() on the host and our connect()
// b) it's not used at all by certain host versions which perform RTSP over ENet
err = resolveHostName(serverInfo->address, AF_UNSPEC, 47984, &RemoteAddr, &RemoteAddrLen);
if (err != 0) {
err = resolveHostName(serverInfo->address, AF_UNSPEC, 47989, &RemoteAddr, &RemoteAddrLen);
}
if (err != 0) {
err = resolveHostName(serverInfo->address, AF_UNSPEC, 48010, &RemoteAddr, &RemoteAddrLen);
}
}
if (err != 0) {
Limelog("failed: %d\n", err);