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/* Check recvmsg/recvmmsg 64-bit timestamp support.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <arpa/inet.h>
#include <string.h>
#include <support/check.h>
#include <support/xsocket.h>
#include <support/xunistd.h>
#include <stdbool.h>
/* AF_INET socket and address used to receive data. */
static int srv;
static struct sockaddr_in srv_addr;
static int
do_sendto (const struct sockaddr_in *addr, int payload)
{
int s = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
xconnect (s, (const struct sockaddr *) addr, sizeof (*addr));
xsendto (s, &payload, sizeof (payload), 0, (const struct sockaddr *) addr,
sizeof (*addr));
xclose (s);
return 0;
}
static void
do_recvmsg_ancillary (bool use_multi_call, struct mmsghdr *mmhdr,
void *msgbuf, size_t msgbuflen, int exp_payload)
{
int payload;
struct iovec iov =
{
.iov_base = &payload,
.iov_len = sizeof (payload)
};
mmhdr->msg_hdr.msg_name = NULL;
mmhdr->msg_hdr.msg_iov = &iov;
mmhdr->msg_hdr.msg_iovlen = 1;
mmhdr->msg_hdr.msg_control = msgbuf;
mmhdr->msg_hdr.msg_controllen = msgbuflen;
int r;
if (use_multi_call)
{
r = recvmmsg (srv, mmhdr, 1, 0, NULL);
if (r >= 0)
r = mmhdr->msg_len;
}
else
r = recvmsg (srv, &mmhdr->msg_hdr, 0);
TEST_COMPARE (r, sizeof (int));
TEST_COMPARE (payload, exp_payload);
}
/* Check if recvmsg create the additional 64 bit timestamp if only 32 bit
is enabled for 64 bit recvmsg symbol. */
static void
do_test_large_buffer (bool mc)
{
struct mmsghdr mmhdr = { 0 };
/* It should be large enought for either timeval/timespec and the
64 time type as well. */
union
{
struct cmsghdr cmsghdr;
char msgbuf[512];
} control;
/* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
is created. */
{
int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
sizeof (int));
TEST_VERIFY_EXIT (r != -1);
do_sendto (&srv_addr, 42);
do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
bool found_timestamp = false;
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
cmsg != NULL;
cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
{
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
found_timestamp = true;
else
TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
}
TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
}
/* Same as before, but for timespec. */
{
int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
sizeof (int));
TEST_VERIFY_EXIT (r != -1);
do_sendto (&srv_addr, 42);
do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
bool found_timestamp = false;
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
cmsg != NULL;
cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
{
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
found_timestamp = true;
else
TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
}
TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
}
}
/* Check if recvmsg does not create the additional 64 bit timestamp if
only 32 bit timestamp is enabled if the ancillary buffer is not large
enought. Also checks if MSG_CTRUNC is set iff for 64 bit recvmsg
symbol. */
static void
do_test_small_buffer (bool mc)
{
struct mmsghdr mmhdr = { 0 };
/* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
is created. */
{
int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
sizeof (int));
TEST_VERIFY_EXIT (r != -1);
union
{
struct cmsghdr cmsghdr;
char msgbuf[CMSG_SPACE (sizeof (struct timeval))];
} control;
do_sendto (&srv_addr, 42);
do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
bool found_timestamp = false;
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
cmsg != NULL;
cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
{
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
found_timestamp = true;
else
TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
}
if (sizeof (time_t) > 4)
{
TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
TEST_COMPARE (found_timestamp, 0);
}
else
{
TEST_VERIFY (!(mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
TEST_COMPARE (found_timestamp, 0);
}
}
/* Same as before, but for timespec. */
{
int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
sizeof (int));
TEST_VERIFY_EXIT (r != -1);
union
{
struct cmsghdr cmsghdr;
char msgbuf[CMSG_SPACE (sizeof (struct timespec))];
} control;
do_sendto (&srv_addr, 42);
do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
bool found_timestamp = false;
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
cmsg != NULL;
cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
{
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
found_timestamp = true;
else
TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
}
if (sizeof (time_t) > 4)
{
TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
TEST_COMPARE (found_timestamp, 0);
}
else
{
TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC) == 0);
TEST_COMPARE (found_timestamp, 0);
}
}
}
static int
do_test (void)
{
/* This test only make sense for ABIs that support 32 bit time_t socket
timestampss. */
if (sizeof (time_t) > 4 && __WORDSIZE == 64)
return 0;
srv = xsocket (AF_INET, SOCK_DGRAM, 0);
srv_addr = (struct sockaddr_in) {
.sin_family = AF_INET,
.sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) },
};
xbind (srv, (struct sockaddr *) &srv_addr, sizeof (srv_addr));
{
socklen_t sa_len = sizeof (srv_addr);
xgetsockname (srv, (struct sockaddr *) &srv_addr, &sa_len);
TEST_VERIFY (sa_len == sizeof (srv_addr));
}
/* Check recvmsg; */
do_test_large_buffer (false);
do_test_small_buffer (false);
/* Check recvmmsg. */
do_test_large_buffer (true);
do_test_small_buffer (true);
return 0;
}
#include <support/test-driver.c>
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