blob: 1e64f1abf1b92c3debd74a564c86ece74bcedbe7 [file] [log] [blame]
/*
* Check decoding of struct msghdr ancillary data.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2016-2017 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 <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifndef SOL_IP
# define SOL_IP 0
#endif
#ifndef SOL_TCP
# define SOL_TCP 6
#endif
#ifndef SCM_SECURITY
# define SCM_SECURITY 3
#endif
#define MIN_SIZE_OF(type, member) \
(offsetof(type, member) + sizeof(((type *) 0)->member))
static struct cmsghdr *
get_cmsghdr(void *const page, const size_t len)
{
return page - CMSG_ALIGN(len);
}
#define DEFAULT_STRLEN 32
static void
print_fds(const struct cmsghdr *const cmsg, const size_t cmsg_len)
{
size_t nfd = cmsg_len > CMSG_LEN(0)
? (cmsg_len - CMSG_LEN(0)) / sizeof(int) : 0;
if (!nfd)
return;
printf(", cmsg_data=[");
int *fdp = (int *) CMSG_DATA(cmsg);
size_t i;
for (i = 0; i < nfd; ++i) {
if (i)
printf(", ");
#if !VERBOSE
if (i >= DEFAULT_STRLEN) {
printf("...");
break;
}
#endif
printf("%d", fdp[i]);
}
printf("]");
}
static void
test_scm_rights1(struct msghdr *const mh,
const size_t msg_controllen,
void *const page,
const void *const src,
const size_t cmsg_len)
{
const size_t aligned_cms_len =
cmsg_len > CMSG_LEN(0) ? CMSG_ALIGN(cmsg_len) : CMSG_LEN(0);
if (cmsg_len >= CMSG_LEN(0)
&& aligned_cms_len + CMSG_LEN(0) <= msg_controllen)
return;
struct cmsghdr *cmsg = get_cmsghdr(page, msg_controllen);
if (msg_controllen >= MIN_SIZE_OF(struct cmsghdr, cmsg_len))
cmsg->cmsg_len = cmsg_len;
if (msg_controllen >= MIN_SIZE_OF(struct cmsghdr, cmsg_level))
cmsg->cmsg_level = SOL_SOCKET;
if (msg_controllen >= MIN_SIZE_OF(struct cmsghdr, cmsg_type))
cmsg->cmsg_type = SCM_RIGHTS;
size_t src_len =
cmsg_len < msg_controllen ? cmsg_len : msg_controllen;
if (src_len > CMSG_LEN(0))
memcpy(CMSG_DATA(cmsg), src, src_len - CMSG_LEN(0));
mh->msg_control = cmsg;
mh->msg_controllen = msg_controllen;
int rc = sendmsg(-1, mh, 0);
int saved_errno = errno;
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0");
if (msg_controllen < CMSG_LEN(0)) {
if (msg_controllen)
printf(", msg_control=%p", cmsg);
} else {
printf(", msg_control=[{cmsg_len=%lu, cmsg_level=SOL_SOCKET"
", cmsg_type=SCM_RIGHTS", (unsigned long) cmsg_len);
print_fds(cmsg, src_len);
printf("}");
if (aligned_cms_len < msg_controllen)
printf(", %p", (void *) cmsg + aligned_cms_len);
printf("]");
}
errno = saved_errno;
printf(", msg_controllen=%lu, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned long) msg_controllen, rc, errno2name());
}
static void
test_scm_rights2(struct msghdr *const mh,
const size_t msg_controllen,
void *const page,
const int *const *const src,
const size_t *const cmsg_len)
{
const size_t aligned_cms_len[2] = {
cmsg_len[0] > CMSG_LEN(0) ? CMSG_ALIGN(cmsg_len[0]) : CMSG_LEN(0),
cmsg_len[1] > CMSG_LEN(0) ? CMSG_ALIGN(cmsg_len[1]) : CMSG_LEN(0)
};
if (cmsg_len[0] < CMSG_LEN(0)
|| aligned_cms_len[0] + CMSG_LEN(0) > msg_controllen
|| aligned_cms_len[0] + aligned_cms_len[1] + CMSG_LEN(0) <= msg_controllen)
return;
struct cmsghdr *const cmsg[2] = {
get_cmsghdr(page, msg_controllen),
(void *) get_cmsghdr(page, msg_controllen) + aligned_cms_len[0]
};
cmsg[0]->cmsg_len = cmsg_len[0];
cmsg[0]->cmsg_level = SOL_SOCKET;
cmsg[0]->cmsg_type = SCM_RIGHTS;
if (cmsg_len[0] > CMSG_LEN(0))
memcpy(CMSG_DATA(cmsg[0]), src[0], cmsg_len[0] - CMSG_LEN(0));
const size_t msg_controllen1 = msg_controllen - aligned_cms_len[0];
if (msg_controllen1 >= MIN_SIZE_OF(struct cmsghdr, cmsg_len))
cmsg[1]->cmsg_len = cmsg_len[1];
if (msg_controllen >= MIN_SIZE_OF(struct cmsghdr, cmsg_level))
cmsg[1]->cmsg_level = SOL_SOCKET;
if (msg_controllen >= MIN_SIZE_OF(struct cmsghdr, cmsg_type))
cmsg[1]->cmsg_type = SCM_RIGHTS;
size_t src1_len =
cmsg_len[1] < msg_controllen1 ? cmsg_len[1] : msg_controllen1;
if (src1_len > CMSG_LEN(0))
memcpy(CMSG_DATA(cmsg[1]), src[1], src1_len - CMSG_LEN(0));
mh->msg_control = cmsg[0];
mh->msg_controllen = msg_controllen;
int rc = sendmsg(-1, mh, 0);
int saved_errno = errno;
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%lu"
", cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS",
(unsigned long) cmsg_len[0]);
print_fds(cmsg[0], cmsg_len[0]);
printf("}, {cmsg_len=%lu, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS",
(unsigned long) cmsg_len[1]);
print_fds(cmsg[1], src1_len);
printf("}");
if (aligned_cms_len[1] < msg_controllen1)
printf(", %p", (void *) cmsg[1] + aligned_cms_len[1]);
printf("]");
errno = saved_errno;
printf(", msg_controllen=%lu, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned long) msg_controllen, rc, errno2name());
}
static void
test_scm_rights3(struct msghdr *const mh, void *const page, const size_t nfds)
{
const size_t len = CMSG_SPACE(sizeof(int) * nfds);
struct cmsghdr *cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(sizeof(int) * nfds);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
int *fdp = (int *) CMSG_DATA(cmsg);
size_t i;
for (i = 0; i < nfds; ++i)
fdp[i] = i;
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u"
", cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS",
(unsigned) cmsg->cmsg_len);
print_fds(cmsg, cmsg->cmsg_len);
printf("}], msg_controllen=%lu, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned long) len, rc, errno2name());
}
static void
print_security(const struct cmsghdr *const cmsg, const size_t cmsg_len)
{
int n = cmsg_len > CMSG_LEN(0) ? cmsg_len - CMSG_LEN(0) : 0;
if (!n)
return;
printf(", cmsg_data=\"%.*s\"", n, CMSG_DATA(cmsg));
}
static void
test_scm_security(struct msghdr *const mh,
const size_t msg_controllen,
void *const page,
const void *const src,
const size_t cmsg_len,
const int cmsg_level,
const char *const cmsg_level_str)
{
const size_t aligned_cms_len =
cmsg_len > CMSG_LEN(0) ? CMSG_ALIGN(cmsg_len) : CMSG_LEN(0);
if (cmsg_len >= CMSG_LEN(0)
&& aligned_cms_len + CMSG_LEN(0) <= msg_controllen)
return;
struct cmsghdr *cmsg = get_cmsghdr(page, msg_controllen);
cmsg->cmsg_len = cmsg_len;
cmsg->cmsg_level = cmsg_level;
cmsg->cmsg_type = SCM_SECURITY;
size_t src_len =
cmsg_len < msg_controllen ? cmsg_len : msg_controllen;
if (src_len > CMSG_LEN(0))
memcpy(CMSG_DATA(cmsg), src, src_len - CMSG_LEN(0));
mh->msg_control = cmsg;
mh->msg_controllen = msg_controllen;
int rc = sendmsg(-1, mh, 0);
int saved_errno = errno;
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%lu, cmsg_level=%s"
", cmsg_type=SCM_SECURITY",
(unsigned long) cmsg_len, cmsg_level_str);
print_security(cmsg, src_len);
printf("}");
if (aligned_cms_len < msg_controllen)
printf(", %p", (void *) cmsg + aligned_cms_len);
printf("]");
errno = saved_errno;
printf(", msg_controllen=%lu, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned long) msg_controllen, rc, errno2name());
}
static void
test_unknown_type(struct msghdr *const mh,
void *const page,
const int cmsg_level,
const char *const cmsg_level_str,
const char *const cmsg_type_str)
{
struct cmsghdr *cmsg = get_cmsghdr(page, CMSG_LEN(0));
cmsg->cmsg_len = CMSG_LEN(0);
cmsg->cmsg_level = cmsg_level;
cmsg->cmsg_type = 0xfacefeed;
mh->msg_control = cmsg;
mh->msg_controllen = cmsg->cmsg_len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u, cmsg_level=%s"
", cmsg_type=%#x /* %s */}], msg_controllen=%u, msg_flags=0}"
", 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_level_str, cmsg->cmsg_type,
cmsg_type_str, (unsigned) mh->msg_controllen, rc, errno2name());
}
static void
test_sol_socket(struct msghdr *const mh, void *const page)
{
static const int fds0[] = { -10, -11, -12, -13 };
static const int fds1[] = { -15, -16, -17, -18 };
size_t msg_controllen, max_msg_controllen;
max_msg_controllen = CMSG_SPACE(sizeof(fds0)) + sizeof(*fds0) - 1;
for (msg_controllen = 0;
msg_controllen <= max_msg_controllen;
msg_controllen++) {
size_t cmsg_len;
for (cmsg_len = 0;
cmsg_len <= msg_controllen + CMSG_LEN(0);
cmsg_len++) {
test_scm_rights1(mh, msg_controllen,
page, fds0, cmsg_len);
}
}
max_msg_controllen =
CMSG_SPACE(sizeof(fds0)) + CMSG_SPACE(sizeof(fds1)) +
sizeof(*fds0) - 1;
for (msg_controllen = CMSG_LEN(0) * 2;
msg_controllen <= max_msg_controllen;
msg_controllen++) {
static const int *const fdps[] = { fds0, fds1 };
size_t cmsg_len[2];
for (cmsg_len[0] = CMSG_LEN(0);
CMSG_ALIGN(cmsg_len[0]) + CMSG_LEN(0) <= msg_controllen
&& CMSG_ALIGN(cmsg_len[0]) <= CMSG_SPACE(sizeof(fds0));
cmsg_len[0]++) {
const size_t msg_controllen1 =
msg_controllen - CMSG_ALIGN(cmsg_len[0]);
for (cmsg_len[1] = 0;
cmsg_len[1] <= msg_controllen1 + CMSG_LEN(0);
cmsg_len[1]++) {
test_scm_rights2(mh, msg_controllen,
page, fdps, cmsg_len);
}
}
}
static const char text[16] = "0123456789abcdef";
max_msg_controllen = CMSG_SPACE(sizeof(text)) + CMSG_LEN(0) - 1;
for (msg_controllen = CMSG_LEN(0);
msg_controllen <= max_msg_controllen;
msg_controllen++) {
size_t cmsg_len;
for (cmsg_len = 0;
cmsg_len <= msg_controllen + CMSG_LEN(0)
&& cmsg_len <= CMSG_LEN(sizeof(text));
cmsg_len++) {
test_scm_security(mh, msg_controllen,
page, text, cmsg_len,
ARG_STR(SOL_SOCKET));
}
}
test_scm_rights3(mh, page, DEFAULT_STRLEN - 1);
test_scm_rights3(mh, page, DEFAULT_STRLEN);
test_scm_rights3(mh, page, DEFAULT_STRLEN + 1);
test_unknown_type(mh, page, ARG_STR(SOL_SOCKET), "SCM_???");
}
static void
test_ip_pktinfo(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str)
{
const unsigned int len = CMSG_SPACE(sizeof(struct in_pktinfo));
struct cmsghdr *const cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
struct in_pktinfo *const info = (struct in_pktinfo *) CMSG_DATA(cmsg);
#ifdef HAVE_IF_INDEXTONAME
info->ipi_ifindex = if_nametoindex("lo");
#else
info->ipi_ifindex = 1;
#endif
info->ipi_spec_dst.s_addr = inet_addr("1.2.3.4");
info->ipi_addr.s_addr = inet_addr("5.6.7.8");
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u, cmsg_level=SOL_IP"
", cmsg_type=%s, cmsg_data={ipi_ifindex=%s"
", ipi_spec_dst=inet_addr(\"%s\")"
", ipi_addr=inet_addr(\"%s\")}}]"
", msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_type_str,
#ifdef HAVE_IF_INDEXTONAME
"if_nametoindex(\"lo\")",
#else
"1",
#endif
"1.2.3.4", "5.6.7.8", len, rc, errno2name());
}
static void
test_ip_uint(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str)
{
const unsigned int len = CMSG_SPACE(sizeof(int));
struct cmsghdr *const cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
unsigned int *u = (void *) CMSG_DATA(cmsg);
*u = 0xfacefeed;
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u"
", cmsg_level=SOL_IP, cmsg_type=%s, cmsg_data=[%u]}]"
", msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_type_str, *u, len,
rc, errno2name());
}
static void
test_ip_uint8_t(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str)
{
const unsigned int len = CMSG_SPACE(1);
struct cmsghdr *const cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(1);
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
*CMSG_DATA(cmsg) = 'A';
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u"
", cmsg_level=SOL_IP, cmsg_type=%s, cmsg_data=[%#x]}]"
", msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_type_str,
(unsigned) (uint8_t) 'A', len, rc, errno2name());
}
static void
print_ip_opts(const void *const cmsg_data, const unsigned int data_len)
{
const unsigned char *const opts = cmsg_data;
unsigned int i;
for (i = 0; i < data_len; ++i) {
if (i)
printf(", ");
#if !VERBOSE
if (i >= DEFAULT_STRLEN) {
printf("...");
break;
}
#endif
printf("0x%02x", opts[i]);
}
}
static void
test_ip_opts(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str,
const unsigned int opts_len)
{
unsigned int len = CMSG_SPACE(opts_len);
struct cmsghdr *cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(opts_len);
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
unsigned int i;
for (i = 0; i < opts_len; ++i)
CMSG_DATA(cmsg)[i] = 'A' + i;
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u"
", cmsg_level=SOL_IP, cmsg_type=%s, cmsg_data=[",
(unsigned) cmsg->cmsg_len, cmsg_type_str);
print_ip_opts(CMSG_DATA(cmsg), opts_len);
printf("]}], msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
len, rc, errno2name());
}
#ifdef IP_CHECKSUM
struct sock_ee {
uint32_t ee_errno;
uint8_t ee_origin;
uint8_t ee_type;
uint8_t ee_code;
uint8_t ee_pad;
uint32_t ee_info;
uint32_t ee_data;
struct sockaddr_in offender;
};
static void
test_ip_recverr(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str)
{
const unsigned int len = CMSG_SPACE(sizeof(struct sock_ee));
struct cmsghdr *const cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sock_ee));
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
struct sock_ee *const e = (struct sock_ee *) CMSG_DATA(cmsg);
e->ee_errno = 0xdeadbeef;
e->ee_origin = 2;
e->ee_type = 3;
e->ee_code = 4;
e->ee_info = 0xfacefeed;
e->ee_data = 0xbadc0ded;
e->offender.sin_family = AF_INET,
e->offender.sin_port = htons(12345),
e->offender.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u, cmsg_level=SOL_IP"
", cmsg_type=%s, cmsg_data={ee_errno=%u, ee_origin=%u"
", ee_type=%u, ee_code=%u, ee_info=%u, ee_data=%u"
", offender={sa_family=AF_INET, sin_port=htons(%hu)"
", sin_addr=inet_addr(\"127.0.0.1\")}}}]"
", msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_type_str,
e->ee_errno, e->ee_origin, e->ee_type,
e->ee_code, e->ee_info, e->ee_data,
ntohs(e->offender.sin_port),
len, rc, errno2name());
}
#endif
#ifdef IP_ORIGDSTADDR
static void
test_ip_origdstaddr(struct msghdr *const mh, void *const page,
const int cmsg_type, const char *const cmsg_type_str)
{
const unsigned int len = CMSG_SPACE(sizeof(struct sockaddr_in));
struct cmsghdr *const cmsg = get_cmsghdr(page, len);
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sockaddr_in));
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = cmsg_type;
struct sockaddr_in *const sin = (struct sockaddr_in *) CMSG_DATA(cmsg);
sin->sin_family = AF_INET,
sin->sin_port = htons(12345),
sin->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u, cmsg_level=SOL_IP"
", cmsg_type=%s, cmsg_data={sa_family=AF_INET"
", sin_port=htons(%hu), sin_addr=inet_addr(\"127.0.0.1\")}}]"
", msg_controllen=%u, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, cmsg_type_str,
ntohs(sin->sin_port), len, rc, errno2name());
}
#endif
static void
test_sol_ip(struct msghdr *const mh, void *const page)
{
test_ip_pktinfo(mh, page, ARG_STR(IP_PKTINFO));
test_ip_uint(mh, page, ARG_STR(IP_TTL));
test_ip_uint8_t(mh, page, ARG_STR(IP_TOS));
test_ip_opts(mh, page, ARG_STR(IP_RECVOPTS), 1);
test_ip_opts(mh, page, ARG_STR(IP_RECVOPTS), 2);
test_ip_opts(mh, page, ARG_STR(IP_RECVOPTS), 3);
test_ip_opts(mh, page, ARG_STR(IP_RECVOPTS), 4);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), 5);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), 6);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), 7);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), 8);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), DEFAULT_STRLEN - 1);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), DEFAULT_STRLEN);
test_ip_opts(mh, page, ARG_STR(IP_RETOPTS), DEFAULT_STRLEN + 1);
#ifdef IP_CHECKSUM
test_ip_recverr(mh, page, ARG_STR(IP_RECVERR));
#endif
#ifdef IP_ORIGDSTADDR
test_ip_origdstaddr(mh, page, ARG_STR(IP_ORIGDSTADDR));
#endif
#ifdef IP_CHECKSUM
test_ip_uint(mh, page, ARG_STR(IP_CHECKSUM));
#endif
test_scm_security(mh, CMSG_LEN(0), page, 0, CMSG_LEN(0),
ARG_STR(SOL_IP));
test_unknown_type(mh, page, ARG_STR(SOL_IP), "IP_???");
}
static void
test_unknown_level(struct msghdr *const mh, void *const page)
{
struct cmsghdr *cmsg = get_cmsghdr(page, CMSG_LEN(0));
cmsg->cmsg_len = CMSG_LEN(0);
cmsg->cmsg_level = SOL_TCP;
cmsg->cmsg_type = 0xdeadbeef;
mh->msg_control = cmsg;
mh->msg_controllen = cmsg->cmsg_len;
int rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u, cmsg_level=%s"
", cmsg_type=%#x}], msg_controllen=%u, msg_flags=0}"
", 0) = %d %s (%m)\n",
(unsigned) cmsg->cmsg_len, "SOL_TCP", cmsg->cmsg_type,
(unsigned) mh->msg_controllen, rc, errno2name());
}
static void
test_big_len(struct msghdr *const mh)
{
int optmem_max;
if (read_int_from_file("/proc/sys/net/core/optmem_max", &optmem_max)
|| optmem_max <= 0 || optmem_max > 0x100000)
optmem_max = sizeof(long long) * (2 * IOV_MAX + 512);
optmem_max = (optmem_max + sizeof(long long) - 1)
& ~(sizeof(long long) - 1);
const size_t len = optmem_max * 2;
struct cmsghdr *const cmsg = tail_alloc(len);
cmsg->cmsg_len = len;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
mh->msg_control = cmsg;
mh->msg_controllen = len;
int rc = sendmsg(-1, mh, 0);
if (EBADF != errno)
perror_msg_and_skip("sendmsg");
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=[{cmsg_len=%u"
", cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS",
(unsigned) cmsg->cmsg_len);
print_fds(cmsg, optmem_max);
printf("}, ...], msg_controllen=%lu, msg_flags=0}, 0) = %d %s (%m)\n",
(unsigned long) len, rc, errno2name());
}
int main(int ac, const char **av)
{
int rc = sendmsg(-1, 0, 0);
printf("sendmsg(-1, NULL, 0) = %d %s (%m)\n", rc, errno2name());
TAIL_ALLOC_OBJECT_CONST_PTR(struct msghdr, mh);
memset(mh, 0, sizeof(*mh));
test_big_len(mh);
rc = sendmsg(-1, mh + 1, 0);
printf("sendmsg(-1, %p, 0) = %d %s (%m)\n",
mh + 1, rc, errno2name());
void *page = tail_alloc(1) + 1;
mh->msg_control = page;
mh->msg_controllen = CMSG_LEN(0);
rc = sendmsg(-1, mh, 0);
printf("sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=NULL"
", msg_iovlen=0, msg_control=%p, msg_controllen=%u"
", msg_flags=0}, 0) = %d %s (%m)\n",
page, (unsigned) CMSG_LEN(0), rc, errno2name());
test_sol_socket(mh, page);
test_sol_ip(mh, page);
test_unknown_level(mh, page);
puts("+++ exited with 0 +++");
return 0;
}