platform_bionic/libc/bionic/NetdClientDispatch.cpp
Elliott Hughes 5c6a3f9fbc libnetd_client: support hooking sendto/sendmsg/sendmmsg too.
Samsung has asked for this for KNOX.

Test: treehugger
Change-Id: Iffaace9f8cb265ce8c911472989c9829cbf91a42
2019-06-20 08:32:24 -07:00

78 lines
2.6 KiB
C++

/*
* Copyright (C) 2014 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 "private/NetdClientDispatch.h"
#include <sys/socket.h>
#ifdef __i386__
#define __socketcall __attribute__((__cdecl__))
#else
#define __socketcall
#endif
extern "C" __socketcall int __accept4(int, sockaddr*, socklen_t*, int);
extern "C" __socketcall int __connect(int, const sockaddr*, socklen_t);
extern "C" __socketcall int __sendmmsg(int, const mmsghdr*, unsigned int, int);
extern "C" __socketcall ssize_t __sendmsg(int, const msghdr*, unsigned int);
extern "C" __socketcall int __sendto(int, const void*, size_t, int, const sockaddr*, socklen_t);
extern "C" __socketcall int __socket(int, int, int);
static unsigned fallBackNetIdForResolv(unsigned netId) {
return netId;
}
static int fallBackDnsOpenProxy() {
return -1;
}
// This structure is modified only at startup (when libc.so is loaded) and never
// afterwards, so it's okay that it's read later at runtime without a lock.
__LIBC_HIDDEN__ NetdClientDispatch __netdClientDispatch __attribute__((aligned(32))) = {
__accept4,
__connect,
__sendmmsg,
__sendmsg,
__sendto,
__socket,
fallBackNetIdForResolv,
fallBackDnsOpenProxy,
};
int accept4(int fd, sockaddr* addr, socklen_t* addr_length, int flags) {
return __netdClientDispatch.accept4(fd, addr, addr_length, flags);
}
int connect(int fd, const sockaddr* addr, socklen_t addr_length) {
return __netdClientDispatch.connect(fd, addr, addr_length);
}
int sendmmsg(int fd, const struct mmsghdr* msgs, unsigned int msg_count, int flags) {
return __netdClientDispatch.sendmmsg(fd, msgs, msg_count, flags);
}
ssize_t sendmsg(int fd, const struct msghdr* msg, int flags) {
return __netdClientDispatch.sendmsg(fd, msg, flags);
}
ssize_t sendto(int fd, const void* buf, size_t n, int flags,
const struct sockaddr* dst_addr, socklen_t dst_addr_length) {
return __netdClientDispatch.sendto(fd, buf, n, flags, dst_addr, dst_addr_length);
}
int socket(int domain, int type, int protocol) {
return __netdClientDispatch.socket(domain, type, protocol);
}