| // Copyright (C) 2020 The Android Open Source Project |
| // |
| // Licensed 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 <dlfcn.h> |
| #include <netinet/in.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| static int (*real_bind)(int sockfd, const sockaddr* addr, socklen_t addrlen) = |
| (int (*)(int, const sockaddr*, socklen_t))dlsym(RTLD_NEXT, "bind"); |
| |
| extern "C" int bind(int sockfd, const sockaddr* addr, socklen_t addrlen) { |
| if (addr->sa_family != AF_INET) return real_bind(sockfd, addr, addrlen); |
| const sockaddr_in* sin = (const sockaddr_in*)addr; |
| if (sin->sin_addr.s_addr != 0) return real_bind(sockfd, addr, addrlen); |
| sockaddr_in new_sin = *sin; |
| new_sin.sin_addr.s_addr = 0x0100007f; |
| return real_bind(sockfd, (sockaddr*)&new_sin, addrlen); |
| } |