From bd9fcd8586b8ae72d4813a3095d70a8be77d4d65 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Tue, 30 Nov 2021 10:40:58 -0800
Subject: [PATCH] add testwild

test behavior when binding to ipv4/6 wildcard interfaces
---
 test/Makefile     |   4 ++
 test/testwild.cpp | 111 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 test/testwild.cpp

diff --git a/test/Makefile b/test/Makefile
index 1a4b541..13ebb95 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -62,6 +62,10 @@ TESTPROD_HOST += testconfig
 testconfig_SRCS += testconfig.cpp
 TESTS += testconfig
 
+TESTPROD_HOST += testwild
+testwild_SRCS += testwild.cpp
+TESTS += testwild
+
 TESTPROD_HOST += testpvreq
 testpvreq_SRCS += testpvreq.cpp
 TESTS += testpvreq
diff --git a/test/testwild.cpp b/test/testwild.cpp
new file mode 100644
index 0000000..dc11797
--- /dev/null
+++ b/test/testwild.cpp
@@ -0,0 +1,111 @@
+/**
+ * Copyright - See the COPYRIGHT that is included with this distribution.
+ * pvxs is distributed subject to a Software License Agreement found
+ * in file LICENSE that is included with this distribution.
+ */
+#define PVXS_ENABLE_EXPERT_API
+
+#include <atomic>
+
+#include <testMain.h>
+
+#include <epicsUnitTest.h>
+
+#include <epicsEvent.h>
+
+#include <pvxs/unittest.h>
+#include <pvxs/log.h>
+#include <pvxs/client.h>
+#include <pvxs/server.h>
+#include <pvxs/sharedpv.h>
+#include <pvxs/source.h>
+#include <pvxs/nt.h>
+#include "evhelper.h"
+
+namespace {
+using namespace pvxs;
+
+// Ensure we can setup a server and client on the wildcard interface(s).
+// bind()ing sockets and similar.
+// No operations are attempted as the default interface on some test systems
+// may have firewall rules blocking PVA traffic in and/or out.
+void testwildcard(const std::string& addr1, const std::string& addr2)
+{
+    testDiag("%s(%s, %s)", __func__,addr1.c_str(), addr2.c_str());
+
+    server::Config sconf;
+    sconf.tcp_port = sconf.udp_port = 0u; // choose randomly
+
+    if(!addr1.empty())
+        sconf.interfaces.push_back(addr1);
+    if(!addr2.empty())
+        sconf.interfaces.push_back(addr2);
+
+    auto serv(sconf.build());
+    sconf = serv.config();
+    testShow()<<"Server Config\n"<<sconf;
+
+    testNotEq(0u, sconf.udp_port);
+    testNotEq(0u, sconf.tcp_port);
+
+    auto cli(serv.clientConfig().build());
+    auto cconf(cli.config());
+    testShow()<<"Client Config\n"<<cconf;
+
+    testEq(sconf.udp_port, cconf.udp_port);
+    testEq(sconf.tcp_port, cconf.tcp_port);
+}
+
+// check logic for detection and fallback when requested TCP port
+// is already in use.
+void testconflict(const char* addr)
+{
+    testDiag("%s(\"%s\")", __func__, addr);
+
+    evsocket otherserver(AF_INET, SOCK_STREAM, 0);
+    otherserver.bind(SockAddr::any(AF_INET));
+    otherserver.listen(4);
+
+    server::Config iconf;
+    iconf.tcp_port = otherserver.sockname().port();
+    iconf.udp_port = 0u; // choose randomly
+    if(addr)
+        iconf.interfaces.push_back(addr);
+
+    auto serv(iconf.build());
+    auto fconf(serv.config());
+    testShow()<<"Server Config\n"<<iconf;
+
+    testNotEq(0u, fconf.udp_port)<<"w/ "<<addr;
+    testNotEq(iconf.tcp_port, fconf.tcp_port)<<"w/ "<<addr;
+}
+
+} // namespace
+
+MAIN(testwild)
+{
+    testPlan(18);
+    testSetup();
+    logger_config_env();
+    SockAttach attach;
+    const bool canIPv6 = pvxs::impl::evsocket::canIPv6;
+    testwildcard("", ""); // implies 0.0.0.0
+    testwildcard("0.0.0.0", "");
+    if(canIPv6) {
+        testwildcard("::", "");
+    } else {
+        testSkip(4, "No IPv6 Support");
+    }
+    if(evsocket::ipstack==evsocket::Linsock) {
+        testconflict("127.0.0.1");
+    } else {
+        testSkip(2, "Can bind both 0.0.0.0 and 127.0.0.1 to the same port");
+    }
+    testconflict("0.0.0.0");
+    if(canIPv6) {
+        testconflict("::");
+    } else {
+        testSkip(2, "No IPv6 Support");
+    }
+    return testDone();
+}