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/*
* Copyright (C) 2019 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <string.h>
#include <sys/socket.h>
#include <async_safe/log.h>
#include "private/bionic_fdtrack.h"
extern "C" ssize_t __recvmsg(int __fd, struct msghdr* __msg, int __flags);
extern "C" int __recvmmsg(int __fd, struct mmsghdr* __msgs, unsigned int __msg_count, int __flags,
const struct timespec* __timeout);
static inline __attribute__((artificial)) __attribute__((always_inline)) void track_fds(
struct msghdr* msg, const char* function_name) {
if (!atomic_load(&__android_fdtrack_hook)) {
return;
}
for (struct cmsghdr* cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_type != SCM_RIGHTS) {
continue;
}
if (cmsg->cmsg_len <= sizeof(struct cmsghdr)) {
continue;
}
size_t data_length = cmsg->cmsg_len - sizeof(struct cmsghdr);
if (data_length % sizeof(int) != 0) {
async_safe_fatal("invalid cmsg length: %zu", data_length);
}
for (size_t offset = 0; offset < data_length; offset += sizeof(int)) {
int fd;
memcpy(&fd, CMSG_DATA(cmsg) + offset, sizeof(int));
FDTRACK_CREATE_NAME(function_name, fd);
}
}
}
ssize_t recvmsg(int __fd, struct msghdr* __msg, int __flags) {
ssize_t rc = __recvmsg(__fd, __msg, __flags);
if (rc == -1) {
return -1;
}
track_fds(__msg, "recvmsg");
return rc;
}
int recvmmsg(int __fd, struct mmsghdr* __msgs, unsigned int __msg_count, int __flags,
const struct timespec* __timeout) {
int rc = __recvmmsg(__fd, __msgs, __msg_count, __flags, __timeout);
if (rc == -1) {
return -1;
}
for (int i = 0; i < rc; ++i) {
track_fds(&__msgs[i].msg_hdr, "recvmmsg");
}
return rc;
}
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