plugins/header_rewrite/lulu.cc

/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

#include <string>
#include <netinet/in.h>

#include "ts/ts.h"
#include "lulu.h"

// Helper function to cleanly get the IP as a string.
char *
getIP(sockaddr const *s_sockaddr, char res[INET6_ADDRSTRLEN])
{
  res[0] = '\0';

  if (s_sockaddr == nullptr) {
    return nullptr;
  }

  // This is a little kludgy, but the TS APIs that returns sockadd's don't return
  // nullptr's in general (it seems). Maybe that should be fixed, or maybe we should
  // export lib/ts/ink_inet.h as C APIs... (according to amc). But without this check,
  // we get ::1 even when the sockaddr isn't populated (e.g. server addr on a cache hit).
  if (AF_UNSPEC == s_sockaddr->sa_family) {
    return nullptr;
  }

  switch (s_sockaddr->sa_family) {
  case AF_INET: {
    const struct sockaddr_in *s_sockaddr_in = reinterpret_cast<const struct sockaddr_in *>(s_sockaddr);
    inet_ntop(AF_INET, &s_sockaddr_in->sin_addr, res, INET_ADDRSTRLEN);
  } break;
  case AF_INET6: {
    const struct sockaddr_in6 *s_sockaddr_in6 = reinterpret_cast<const struct sockaddr_in6 *>(s_sockaddr);
    inet_ntop(AF_INET6, &s_sockaddr_in6->sin6_addr, res, INET6_ADDRSTRLEN);
  } break;
  }

  return res[0] ? res : nullptr;
}

// Return it as a std::string instead (more expensive, but sometimes convenient)
std::string
getIP(sockaddr const *s_sockaddr)
{
  char res[INET6_ADDRSTRLEN] = {'\0'};

  if (getIP(s_sockaddr, res)) {
    return res;
  }

  return "";
}

// Returns the port of a sockaddr
uint16_t
getPort(sockaddr const *s_sockaddr)
{
  if (!s_sockaddr) {
    return 0;
  }

  switch (s_sockaddr->sa_family) {
  case AF_INET: {
    const struct sockaddr_in *s_sockaddr_in = reinterpret_cast<const struct sockaddr_in *>(s_sockaddr);
    return ntohs(s_sockaddr_in->sin_port);
  } break;
  case AF_INET6: {
    const struct sockaddr_in6 *s_sockaddr_in6 = reinterpret_cast<const struct sockaddr_in6 *>(s_sockaddr);
    return ntohs(s_sockaddr_in6->sin6_port);
  } break;
  default:
    return 0;
    break;
  }
}