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strace/tests/nlattr.c
JingPiao Chen d331383d7d netlink: print unrecognized nlattr in hex 
* nlattr.c (fetch_nlattr): Replace printstrn
with printstr_ex and set QUOTE_FORCE_HEX flag.
* tests/nlattr.c (test_nlattr): Update expected output.
2017-07-07 16:43:41 +00:00

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/*
* Check decoding of netlink attribute.
*
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2017 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 "tests.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include "netlink.h"
#include <linux/rtnetlink.h>
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
static void
test_nlattr(const int fd)
{
static const struct msg {
struct nlmsghdr nlh;
struct unix_diag_msg udm;
} c_msg = {
.nlh = {
.nlmsg_len = sizeof(struct msg),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP
},
.udm = {
.udiag_family = AF_UNIX,
.udiag_type = SOCK_STREAM,
.udiag_state = TCP_FIN_WAIT1
}
};
struct msg *msg;
struct nlattr *nla;
unsigned int msg_len;
long rc;
/* fetch fail: len < sizeof(struct nlattr) */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + 2;
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
memcpy(nla, "12", 2);
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, \"\\x31\\x32\"}, %u"
", MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, msg_len, sprintrc(rc));
/* fetch fail: short read */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
msg = tail_memdup(&c_msg, msg_len - 1);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, %p}, %u"
", MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, (void *) msg + NLMSG_SPACE(sizeof(msg->udm)),
msg_len, sprintrc(rc));
/* print one struct nlattr */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = sizeof(*nla),
.nla_type = UNIX_DIAG_NAME
};
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
/* print one struct nlattr with nla_len out of msg_len bounds */
nla->nla_len += 8;
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
/* print one struct nlattr and some data */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 4;
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = NLA_HDRLEN + 4,
.nla_type = UNIX_DIAG_SHUTDOWN + 1
};
memcpy(RTA_DATA(nla), "1234", 4);
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {{nla_len=%u"
", nla_type=%#x /* UNIX_DIAG_??? */}"
", \"\\x31\\x32\\x33\\x34\"}}"
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
msg_len, sprintrc(rc));
/* print one struct nlattr and fetch fail second struct nlattr */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN + 2;
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = NLA_HDRLEN,
.nla_type = UNIX_DIAG_NAME
};
memcpy(nla + 1, "12", 2);
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
", nla_type=UNIX_DIAG_NAME}, \"\\x31\\x32\"]}, %u"
", MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
/* print one struct nlattr and short read of second struct nlattr */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
msg = tail_memdup(&c_msg, msg_len - 1);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = NLA_HDRLEN,
.nla_type = UNIX_DIAG_NAME
};
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
", nla_type=UNIX_DIAG_NAME}, %p]}, %u"
", MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, nla + 1, msg_len, sprintrc(rc));
/* print two struct nlattr */
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + NLA_HDRLEN * 2;
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = NLA_HDRLEN,
.nla_type = UNIX_DIAG_NAME
};
*(nla + 1) = (struct nlattr) {
.nla_len = NLA_HDRLEN,
.nla_type = UNIX_DIAG_PEER
};
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, [{nla_len=%u"
", nla_type=UNIX_DIAG_NAME}, {nla_len=%u"
", nla_type=UNIX_DIAG_PEER}]}, %u"
", MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, nla->nla_len,
msg_len, sprintrc(rc));
/* print first nlattr only when its nla_len is less than NLA_HDRLEN */
nla->nla_len = NLA_HDRLEN - 1;
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=UNIX_DIAG_NAME}}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
/* abbreviated output */
#define ABBREV_LEN (DEFAULT_STRLEN + 1)
msg_len = NLA_HDRLEN * ABBREV_LEN + NLMSG_SPACE(sizeof(msg->udm));
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
unsigned int i;
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
for (i = 0; i < ABBREV_LEN; ++i)
nla[i] = (struct nlattr) {
.nla_len = NLA_HDRLEN,
.nla_type = UNIX_DIAG_SHUTDOWN + 1 + i
};
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}"
", {udiag_family=AF_UNIX, udiag_type=SOCK_STREAM"
", udiag_state=TCP_FIN_WAIT1, udiag_ino=0"
", udiag_cookie=[0, 0]}, [",
fd, msg_len);
for (i = 0; i < DEFAULT_STRLEN; ++i) {
if (i)
printf(", ");
printf("{nla_len=%u, nla_type=%#x /* UNIX_DIAG_??? */}",
nla->nla_len, UNIX_DIAG_SHUTDOWN + 1 + i);
}
printf(", ...]}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
msg_len, sprintrc(rc));
}
static void
test_nla_type(const int fd)
{
static const struct msg {
struct nlmsghdr nlh;
struct unix_diag_msg udm;
} c_msg = {
.nlh = {
.nlmsg_len = sizeof(struct msg),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP
},
.udm = {
.udiag_family = AF_UNIX,
.udiag_type = SOCK_STREAM,
.udiag_state = TCP_FIN_WAIT1
}
};
struct msg *msg;
struct nlattr *nla;
unsigned int msg_len;
long rc;
msg_len = NLMSG_SPACE(sizeof(msg->udm)) + sizeof(*nla);
msg = tail_memdup(&c_msg, msg_len);
memcpy(&msg->nlh.nlmsg_len, &msg_len, sizeof(msg_len));
nla = NLMSG_ATTR(msg, sizeof(msg->udm));
*nla = (struct nlattr) {
.nla_len = sizeof(*nla),
.nla_type = NLA_F_NESTED | UNIX_DIAG_NAME
};
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=NLA_F_NESTED|UNIX_DIAG_NAME}}"
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
nla->nla_type = NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
nla->nla_type = NLA_F_NESTED | NLA_F_NET_BYTEORDER | UNIX_DIAG_NAME;
rc = sendto(fd, msg, msg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=NLA_F_NESTED|NLA_F_NET_BYTEORDER|UNIX_DIAG_NAME}}"
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg_len, nla->nla_len, msg_len, sprintrc(rc));
nla->nla_type = NLA_F_NESTED | (UNIX_DIAG_SHUTDOWN + 1);
rc = sendto(fd, msg, msg->nlh.nlmsg_len, MSG_DONTWAIT, NULL, 0);
printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY"
", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
", udiag_ino=0, udiag_cookie=[0, 0]}, {nla_len=%u"
", nla_type=NLA_F_NESTED|%#x /* UNIX_DIAG_??? */}}"
", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
fd, msg->nlh.nlmsg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
msg->nlh.nlmsg_len, sprintrc(rc));
}
int main(void)
{
skip_if_unavailable("/proc/self/fd/");
const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
test_nlattr(fd);
test_nla_type(fd);
puts("+++ exited with 0 +++");
return 0;
}
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