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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <stdio.h>
#include <stdlib.h>
#include <vespa/vespalib/net/socket_address.h>
#include <vespa/vespalib/stllike/string.h>
#include <set>
using vespalib::SocketAddress;
std::set<vespalib::string> make_ip_set() {
std::set<vespalib::string> result;
for (const auto &addr: SocketAddress::get_interfaces()) {
result.insert(addr.ip_address());
}
return result;
}
vespalib::string normalize(const vespalib::string &hostname) {
vespalib::string canon_name = SocketAddress::normalize(hostname);
if (canon_name != hostname) {
fprintf(stderr, "warning: hostname validation: '%s' is not same as canonical hostname '%s'\n",
hostname.c_str(), canon_name.c_str());
}
return canon_name;
}
int usage(const char *self) {
fprintf(stderr, "usage: %s <hostname>\n", self);
return 1;
}
int main(int argc, char **argv) {
if (argc != 2) {
return usage(argv[0]);
}
bool valid = true;
auto my_ip_set = make_ip_set();
vespalib::string hostname = normalize(argv[1]);
auto addr_list = SocketAddress::resolve(80, hostname.c_str());
if (addr_list.empty()) {
valid = false;
fprintf(stderr, "FATAL: hostname validation failed: '%s' could not be resolved\n",
hostname.c_str());
}
for (const SocketAddress &addr: addr_list) {
vespalib::string ip_addr = addr.ip_address();
if (my_ip_set.count(ip_addr) == 0) {
valid = false;
fprintf(stderr, "FATAL: hostname validation failed: '%s' resolves to ip address not owned by this host (%s)\n",
hostname.c_str(), ip_addr.c_str());
}
}
return valid ? 0 : 1;
}
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