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[mdns] connection test: don't wait if connect() succeeds immediately

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This commit is contained in:
ejurgensen 2018-09-10 19:42:04 +02:00
parent 475c598d0e
commit 2c1f2f1b15
1 changed files with 32 additions and 26 deletions
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58
src/mdns_avahi.c
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@ -499,49 +499,55 @@ connection_test(int family, const char *address, const char *address_log, int po
ret = getaddrinfo(address, strport, &hints, &ai);
if (ret < 0)
{
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with getaddrinfo error: %s\n", address_log, port, gai_strerror(ret));
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with getaddrinfo error: %s\n", address_log, port, gai_strerror(ret));
return -1;
}
sock = socket(ai->ai_family, ai->ai_socktype | SOCK_NONBLOCK, ai->ai_protocol);
if (sock < 0)
{
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with socket error: %s\n", address_log, port, strerror(errno));
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with socket error: %s\n", address_log, port, strerror(errno));
goto out_free_ai;
}
ret = connect(sock, ai->ai_addr, ai->ai_addrlen);
if (ret < 0 && errno != EALREADY && errno != EINPROGRESS)
if (ret < 0 && errno != EINPROGRESS)
{
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with connect error: %s\n", address_log, port, strerror(errno));
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with connect error: %s\n", address_log, port, strerror(errno));
goto out_close_socket;
}
FD_ZERO(&fdset);
FD_SET(sock, &fdset);
ret = select(sock + 1, NULL, &fdset, NULL, &timeout);
if (ret != 1)
// We often need to wait for the connection. On Linux this seems always to be
// the case, but FreeBSD connect() sometimes returns immediate success.
if (ret != 0)
{
if (errno == EINPROGRESS)
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d timed out (limit is %d seconds)\n", address_log, port, MDNS_CONNECT_TEST_TIMEOUT);
else
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with select error: %s\n", address_log, port, strerror(errno));
goto out_close_socket;
}
FD_ZERO(&fdset);
FD_SET(sock, &fdset);
len = sizeof(error);
ret = getsockopt(sock, SOL_SOCKET, SO_ERROR, &error, &len);
if (ret < 0)
{
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with getsockopt error: %s\n", address_log, port, strerror(errno));
goto out_close_socket;
}
ret = select(sock + 1, NULL, &fdset, NULL, &timeout);
if (ret < 0)
{
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with select error: %s\n", address_log, port, strerror(errno));
goto out_close_socket;
}
else if (ret == 0)
{
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d timed out (limit is %d seconds)\n", address_log, port, MDNS_CONNECT_TEST_TIMEOUT);
goto out_close_socket;
}
if (error)
{
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d failed with getsockopt return: %s\n", address_log, port, strerror(error));
goto out_close_socket;
len = sizeof(error);
ret = getsockopt(sock, SOL_SOCKET, SO_ERROR, &error, &len);
if (ret < 0)
{
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with getsockopt error: %s\n", address_log, port, strerror(errno));
goto out_close_socket;
}
else if (error)
{
DPRINTF(E_WARN, L_MDNS, "Connection test to %s:%d failed with getsockopt return: %s\n", address_log, port, strerror(error));
goto out_close_socket;
}
}
DPRINTF(E_DBG, L_MDNS, "Connection test to %s:%d completed successfully\n", address_log, port);