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dns.mitm: support wildcards in hosts

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Michael Scire 2021-01-31 08:27:56 -08:00 committed by SciresM
parent 6694d8c2d9
commit b30311be65
1 changed files with 46 additions and 3 deletions
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49
stratosphere/ams_mitm/source/dns_mitm/dnsmitm_host_redirection.cpp
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@ -23,10 +23,53 @@ namespace ams::mitm::socket::resolver {
namespace {
/* https://github.com/clibs/wildcardcmp */
constexpr int wildcardcmp(const char *pattern, const char *string) {
const char *w = nullptr; /* last `*` */
const char *s = nullptr; /* last checked char */
/* malformed */
if (!pattern || !string) return 0;
/* loop 1 char at a time */
while (1) {
if (!*string) {
if (!*pattern) return 1;
if ('*' == *pattern) return 1;
if (!*s) return 0;
string = s++;
pattern = w;
continue;
} else {
if (*pattern != *string) {
if ('*' == *pattern) {
w = ++pattern;
s = string;
/* "*" -> "foobar" */
if (*pattern) continue;
return 1;
} else if (w) {
string++;
/* "*ooba*" -> "foobar" */
continue;
}
return 0;
}
}
string++;
pattern++;
}
return 1;
}
constexpr const char DefaultHostsFile[] =
"# Nintendo telemetry servers\n"
"127.0.0.1 receive-lp1.dg.srv.nintendo.net\n"
"127.0.0.1 receive-lp1.er.srv.nintendo.net\n";
"127.0.0.1 receive-*.*.srv.nintendo.net\n";
static_assert(wildcardcmp("receive-*.*.srv.nintendo.net", "receive-lp1.dg.srv.nintendo.net") == 1);
static_assert(wildcardcmp("receive-*.*.srv.nintendo.net", "receive-lp1.er.srv.nintendo.net") == 1);
constinit os::SdkMutex g_redirection_lock;
std::unordered_map<std::string, ams::socket::InAddrT> g_redirection_map;
@ -305,7 +348,7 @@ namespace ams::mitm::socket::resolver {
std::scoped_lock lk(g_redirection_lock);
for (const auto &[host, address] : g_redirection_map) {
if (std::strcmp(host.c_str(), hostname) == 0) {
if (wildcardcmp(host.c_str(), hostname) == 0) {
*out = address;
return true;
}