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Check XRP endpoints for circular paths (RIPD-1781):

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The payment engine restricts payment paths so two steps do not input the
same Currency/Issuer or output the same Currency/Issuer. This check was
skipped when the path started or ended with XRP. An example of a path
that was incorrectly accepted was: XRP -> //USD -> //XRP -> EUR

This patch enables the path loop check for paths that start or end with
XRP.
This commit is contained in:
seelabs
2020-01-06 11:55:09 -08:00
committed by manojsdoshi
parent 905a97e0aa
commit d097819c52
5 changed files with 114 additions and 2 deletions
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97
src/test/app/Flow_test.cpp
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@@ -1180,6 +1180,100 @@ struct Flow_test : public beast::unit_test::suite
ter(temBAD_PATH));
}
void
testXRPPathLoop()
{
testcase("Circular XRP");
using namespace jtx;
auto const alice = Account("alice");
auto const bob = Account("bob");
auto const gw = Account("gw");
auto const USD = gw["USD"];
auto const EUR = gw["EUR"];
for (auto const withFix : {true, false})
{
auto const feats = [&withFix]() -> FeatureBitset {
if (withFix)
return supported_amendments();
return supported_amendments() - FeatureBitset{fix1781};
}();
{
// Payment path starting with XRP
Env env(*this, feats);
env.fund(XRP(10000), alice, bob, gw);
env.trust(USD(1000), alice, bob);
env.trust(EUR(1000), alice, bob);
env(pay(gw, alice, USD(100)));
env(pay(gw, alice, EUR(100)));
env.close();
env(offer(alice, XRP(100), USD(100)), txflags(tfPassive));
env(offer(alice, USD(100), XRP(100)), txflags(tfPassive));
env(offer(alice, XRP(100), EUR(100)), txflags(tfPassive));
env.close();
TER const expectedTer =
withFix ? TER{temBAD_PATH_LOOP} : TER{tesSUCCESS};
env(pay(alice, bob, EUR(1)),
path(~USD, ~XRP, ~EUR),
sendmax(XRP(1)),
txflags(tfNoRippleDirect),
ter(expectedTer));
}
pass();
}
{
// Payment path ending with XRP
Env env(*this);
env.fund(XRP(10000), alice, bob, gw);
env.trust(USD(1000), alice, bob);
env.trust(EUR(1000), alice, bob);
env(pay(gw, alice, USD(100)));
env(pay(gw, alice, EUR(100)));
env.close();
env(offer(alice, XRP(100), USD(100)), txflags(tfPassive));
env(offer(alice, EUR(100), XRP(100)), txflags(tfPassive));
env.close();
// EUR -> //XRP -> //USD ->XRP
env(pay(alice, bob, XRP(1)),
path(~XRP, ~USD, ~XRP),
sendmax(EUR(1)),
txflags(tfNoRippleDirect),
ter(temBAD_PATH_LOOP));
}
{
// Payment where loop is formed in the middle of the path, not on an
// endpoint
auto const JPY = gw["JPY"];
Env env(*this);
env.fund(XRP(10000), alice, bob, gw);
env.close();
env.trust(USD(1000), alice, bob);
env.trust(EUR(1000), alice, bob);
env.trust(JPY(1000), alice, bob);
env.close();
env(pay(gw, alice, USD(100)));
env(pay(gw, alice, EUR(100)));
env(pay(gw, alice, JPY(100)));
env.close();
env(offer(alice, USD(100), XRP(100)), txflags(tfPassive));
env(offer(alice, XRP(100), EUR(100)), txflags(tfPassive));
env(offer(alice, EUR(100), XRP(100)), txflags(tfPassive));
env(offer(alice, XRP(100), JPY(100)), txflags(tfPassive));
env.close();
env(pay(alice, bob, JPY(1)),
path(~XRP, ~EUR, ~XRP, ~JPY),
sendmax(USD(1)),
txflags(tfNoRippleDirect),
ter(temBAD_PATH_LOOP));
}
}
void testWithFeats(FeatureBitset features)
{
using namespace jtx;
@@ -1204,6 +1298,7 @@ struct Flow_test : public beast::unit_test::suite
void run() override
{
testLimitQuality();
testXRPPathLoop();
testRIPD1443();
testRIPD1449();
@@ -1231,7 +1326,7 @@ struct Flow_manual_test : public Flow_test
testWithFeats(all - flowCross - f1513);
testWithFeats(all - flowCross );
testWithFeats(all - f1513);
testWithFeats(all );
testWithFeats(all );
testEmptyStrand(all - f1513);
testEmptyStrand(all );