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/*
* Copyright (c) 2010 Andreas Schwab <schwab@linux-m68k.org>
* Copyright (c) 2012-2013 Denys Vlasenko <vda.linux@googlemail.com>
* Copyright (c) 2014 Masatake YAMATO <yamato@redhat.com>
* Copyright (c) 2010-2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2016-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "defs.h"
#include "msghdr.h"
#include "xstring.h"
#include <limits.h>
static bool
fetch_struct_mmsghdr_for_print(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len, void *const mh)
{
return (entering(tcp) || !syserror(tcp)) &&
fetch_struct_mmsghdr(tcp, addr, mh);
}
struct print_struct_mmsghdr_config {
const int *p_user_msg_namelen;
unsigned int msg_len_vlen;
unsigned int count;
bool use_msg_len;
};
static bool
print_struct_mmsghdr(struct tcb *tcp, void *elem_buf,
size_t elem_size, void *data)
{
const struct mmsghdr *const mmsg = elem_buf;
struct print_struct_mmsghdr_config *const c = data;
if (!c->count) {
tprints("...");
return false;
}
--c->count;
tprints("{msg_hdr=");
print_struct_msghdr(tcp, &mmsg->msg_hdr, c->p_user_msg_namelen,
c->use_msg_len ? mmsg->msg_len : (kernel_ulong_t) -1);
if (c->msg_len_vlen) {
tprintf(", msg_len=%u", mmsg->msg_len);
--c->msg_len_vlen;
}
tprints("}");
if (c->p_user_msg_namelen)
++c->p_user_msg_namelen;
return true;
}
static void
free_mmsgvec_data(void *ptr)
{
char **pstr = ptr;
free(*pstr);
*pstr = 0;
free(ptr);
}
struct mmsgvec_data {
char *timeout;
unsigned int count;
int namelen[IOV_MAX];
};
static void
save_mmsgvec_namelen(struct tcb *const tcp, kernel_ulong_t addr,
unsigned int len, const char *const timeout)
{
if (len > IOV_MAX)
len = IOV_MAX;
const size_t data_size = offsetof(struct mmsgvec_data, namelen)
+ sizeof(int) * len;
struct mmsgvec_data *const data = xmalloc(data_size);
data->timeout = xstrdup(timeout);
unsigned int i, fetched;
for (i = 0; i < len; ++i, addr += fetched) {
struct mmsghdr mh;
fetched = fetch_struct_mmsghdr(tcp, addr, &mh);
if (!fetched)
break;
data->namelen[i] = mh.msg_hdr.msg_namelen;
}
data->count = i;
set_tcb_priv_data(tcp, data, free_mmsgvec_data);
}
static void
decode_mmsgvec(struct tcb *const tcp, const kernel_ulong_t addr,
const unsigned int vlen, const unsigned int msg_len_vlen,
const bool use_msg_len)
{
struct mmsghdr mmsg;
struct print_struct_mmsghdr_config c = {
.msg_len_vlen = msg_len_vlen,
.count = IOV_MAX,
.use_msg_len = use_msg_len
};
const struct mmsgvec_data *const data = get_tcb_priv_data(tcp);
if (data) {
if (data->count < c.count)
c.count = data->count;
c.p_user_msg_namelen = data->namelen;
}
print_array(tcp, addr, vlen, &mmsg, sizeof_struct_mmsghdr(),
fetch_struct_mmsghdr_for_print,
print_struct_mmsghdr, &c);
}
void
dumpiov_in_mmsghdr(struct tcb *const tcp, kernel_ulong_t addr)
{
unsigned int len = tcp->u_rval;
unsigned int i, fetched;
struct mmsghdr mmsg;
for (i = 0; i < len; ++i, addr += fetched) {
fetched = fetch_struct_mmsghdr(tcp, addr, &mmsg);
if (!fetched)
break;
tprintf(" = %" PRI_klu " buffers in vector %u\n",
(kernel_ulong_t) mmsg.msg_hdr.msg_iovlen, i);
dumpiov_upto(tcp, mmsg.msg_hdr.msg_iovlen,
ptr_to_kulong(mmsg.msg_hdr.msg_iov),
mmsg.msg_len);
}
}
SYS_FUNC(sendmmsg)
{
if (entering(tcp)) {
/* sockfd */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
if (!verbose(tcp)) {
/* msgvec */
printaddr(tcp->u_arg[1]);
/* vlen */
tprintf(", %u, ", (unsigned int) tcp->u_arg[2]);
/* flags */
printflags(msg_flags, tcp->u_arg[3], "MSG_???");
return RVAL_DECODED;
}
} else {
const unsigned int msg_len_vlen =
syserror(tcp) ? 0 : tcp->u_rval;
/* msgvec */
temporarily_clear_syserror(tcp);
decode_mmsgvec(tcp, tcp->u_arg[1], tcp->u_arg[2],
msg_len_vlen, false);
restore_cleared_syserror(tcp);
/* vlen */
tprintf(", %u, ", (unsigned int) tcp->u_arg[2]);
/* flags */
printflags(msg_flags, tcp->u_arg[3], "MSG_???");
}
return 0;
}
SYS_FUNC(recvmmsg)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
if (verbose(tcp)) {
save_mmsgvec_namelen(tcp, tcp->u_arg[1], tcp->u_arg[2],
sprint_timespec(tcp, tcp->u_arg[4]));
} else {
/* msgvec */
printaddr(tcp->u_arg[1]);
/* vlen */
tprintf(", %u, ", (unsigned int) tcp->u_arg[2]);
/* flags */
printflags(msg_flags, tcp->u_arg[3], "MSG_???");
tprints(", ");
print_timespec(tcp, tcp->u_arg[4]);
}
return 0;
} else {
if (verbose(tcp)) {
/* msgvec */
decode_mmsgvec(tcp, tcp->u_arg[1], tcp->u_rval,
tcp->u_rval, true);
/* vlen */
tprintf(", %u, ", (unsigned int) tcp->u_arg[2]);
/* flags */
printflags(msg_flags, tcp->u_arg[3], "MSG_???");
tprints(", ");
/* timeout on entrance */
tprints(*(const char **) get_tcb_priv_data(tcp));
}
if (syserror(tcp))
return 0;
if (tcp->u_rval == 0) {
tcp->auxstr = "Timeout";
return RVAL_STR;
}
if (!verbose(tcp) || !tcp->u_arg[4])
return 0;
/* timeout on exit */
static char str[sizeof("left") + TIMESPEC_TEXT_BUFSIZE];
xsprintf(str, "left %s", sprint_timespec(tcp, tcp->u_arg[4]));
tcp->auxstr = str;
return RVAL_STR;
}
}
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