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testsock check bind() order behavior for ipv4/6

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This commit is contained in:
Michael Davidsaver
2021-11-29 10:22:38 -08:00
parent d0b62d695f
commit 8e56972dbc
2 changed files with 86 additions and 10 deletions
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src/evhelper.cpp
+17 -9
View File
@@ -619,17 +619,25 @@ std::vector<SockAddr> evsocket::broadcasts(const SockAddr* match) const
bool evsocket::canIPv6()
{
auto sock = socket(AF_INET6, SOCK_DGRAM, 0);
if(sock!=evutil_socket_t(-1)) {
evutil_closesocket(sock);
try {
evsocket sock(AF_INET6, SOCK_DGRAM, 0);
auto addr(SockAddr::loopback(AF_INET6));
sock.bind(addr);
return true;
}catch(std::system_error& e){
auto err = e.code().value(); // errno
switch(err) {
case EAFNOSUPPORT: // socket() fails. OS kernel not built with IPv6 support
case SOCK_EADDRNOTAVAIL:// bind() fails. Missing [::1]. Incomplete IPv6 config
break;
default:
log_warn_printf(logsock, "Unexpected errno %d while probing IPv6: %s\n",
err, evutil_socket_error_to_string(err));
break;
}
return false;
}
int err = evutil_socket_geterror(sock);
if(err!=EAFNOSUPPORT) {
log_warn_printf(logsock, "Unexpected errno %d while probing IPv6: %s\n",
err, evutil_socket_error_to_string(err));
}
return false;
}
#if EPICS_VERSION_INT<VERSION_INT(7,0,3,1)
test/testsock.cpp
+69 -1
View File
@@ -8,6 +8,7 @@
#include <cstring>
#include <system_error>
#include <sstream>
#include <epicsUnitTest.h>
#include <testMain.h>
@@ -33,6 +34,45 @@ bool is_wine()
namespace {
using namespace pvxs;
void test_bind46(const char* saddr1, const char* saddr2, int type, int expect)
{
const std::string label = SB()<<__func__<<"("<<saddr1<<", "<<saddr2<<", "<<(type==SOCK_STREAM?"tcp":"udp")<<", "<<expect<<")";
testDiag("%s", label.c_str());
SockAddr addr1(saddr1);
SockAddr addr2(saddr2);
evsocket s1(addr1.family(), type, 0),
s2(addr2.family(), type, 0);
try {
s1.bind(addr1);
}catch(std::exception& e){
testFail("bind() error: %s", e.what());
return;
}
addr2.setPort(addr1.port());
auto doListen = [type](const SockAddr& addr, const evsocket& sock) {
if(type==SOCK_STREAM && listen(sock.sock, 4u)) {
auto err = evutil_socket_geterror(sock.sock);
testFail("Unable to listen on %s : (%d) %s",
addr.tostring().c_str(), err, evutil_socket_error_to_string(err));
}
};
doListen(addr1, s1);
try{
s2.bind(addr2);
doListen(addr2, s2);
testEq(0, expect)<<label;
}catch(std::system_error& e){
auto err = e.code().value();
testEq(err, expect)<<label<<" : "<<evutil_socket_error_to_string(err);
}
}
void test_ifacemap()
{
testDiag("Enter %s", __func__);
@@ -354,8 +394,36 @@ MAIN(testsock)
{
SockAttach attach;
logger_config_env();
testPlan(58);
testPlan(66);
testSetup();
// check for behavior when binding ipv4 and ipv6 to the same socket
// as a function of socket type and order.
if(evsocket::canIPv6()) {
// IPv4 and v6 loopback addresses are entirely distinct,
// so no problem binding to both w/ or w/o IPV6_V6ONLY
test_bind46("127.0.0.1" , "::1" , SOCK_DGRAM , 0);
test_bind46("::1" , "127.0.0.1" , SOCK_DGRAM , 0);
test_bind46("127.0.0.1" , "::1" , SOCK_STREAM , 0);
test_bind46("::1" , "127.0.0.1" , SOCK_STREAM , 0);
#if defined(_WIN32) || defined(__rtems__)
test_bind46("0.0.0.0" , "::" , SOCK_DGRAM , 0);
test_bind46("::" , "0.0.0.0" , SOCK_DGRAM , 0);
test_bind46("0.0.0.0" , "::" , SOCK_STREAM , 0);
test_bind46("::" , "0.0.0.0" , SOCK_STREAM , 0);
#elif defined(__linux__)
test_bind46("0.0.0.0" , "::" , SOCK_DGRAM , EADDRINUSE);
test_bind46("::" , "0.0.0.0" , SOCK_DGRAM , EADDRINUSE);
test_bind46("0.0.0.0" , "::" , SOCK_STREAM , EADDRINUSE);
test_bind46("::" , "0.0.0.0" , SOCK_STREAM , EADDRINUSE);
#else
test_bind46("0.0.0.0" , "::" , SOCK_DGRAM , 0);
test_bind46("::" , "0.0.0.0" , SOCK_DGRAM , EADDRINUSE);
test_bind46("0.0.0.0" , "::" , SOCK_STREAM , 0);
test_bind46("::" , "0.0.0.0" , SOCK_STREAM , EADDRINUSE);
#endif
} else {
testSkip(8, "No IPv6 runtime support");
}
test_ifacemap();
test_udp(AF_INET);
try{