blob: f81faef46505f5a57e95433f70b5556e385ca45f [file] [log] [blame]
/*
* Check decoding of SIOCGIFCONF command of ioctl syscall.
*
* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
* 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 <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#define MAX_STRLEN 1
static void
print_ifc_len(int val)
{
if (val % (int) sizeof(struct ifreq))
printf("%d", val);
else
printf("%d * sizeof(struct ifreq)",
val / (int) sizeof(struct ifreq));
}
static void
print_ifconf(struct ifconf *ifc, int in_len, char *in_buf, long rc)
{
if (in_buf) {
printf("{ifc_len=");
print_ifc_len(in_len);
if (in_len != ifc->ifc_len) {
printf(" => ");
print_ifc_len(ifc->ifc_len);
}
} else {
printf("{ifc_len=");
print_ifc_len(ifc->ifc_len);
}
printf(", ifc_buf=");
if ((rc < 0) || !in_buf) {
if (in_buf)
printf("%p", in_buf);
else
printf("NULL");
} else {
int i;
printf("[");
for (i = 0; i < (ifc->ifc_len) &&
i < (int) (MAX_STRLEN * sizeof(struct ifreq));
i += sizeof(struct ifreq)) {
struct ifreq *ifr = (struct ifreq *) (ifc->ifc_buf + i);
struct sockaddr_in *const sa_in =
(struct sockaddr_in *) &(ifr->ifr_addr);
if (i)
printf(", ");
printf("{ifr_name=\"%s\", ifr_addr={sa_family=AF_INET, "
"sin_port=htons(%u), sin_addr=inet_addr(\"%s\")}"
"}", ifr->ifr_name, ntohs(sa_in->sin_port),
inet_ntoa(sa_in->sin_addr));
}
if ((size_t) (ifc->ifc_len - i) >= sizeof(struct ifreq))
printf(", ...");
printf("]");
}
printf("}");
}
static void
gifconf_ioctl(int fd, struct ifconf *ifc, bool ifc_valid)
{
const char * errstr;
int in_len;
char *in_buf;
long rc;
if (ifc_valid) {
in_len = ifc->ifc_len;
in_buf = ifc->ifc_buf;
}
rc = ioctl(fd, SIOCGIFCONF, ifc);
errstr = sprintrc(rc);
printf("ioctl(%d, SIOCGIFCONF, ", fd);
if (ifc_valid) {
print_ifconf(ifc, in_len, in_buf, rc);
} else {
if (ifc)
printf("%p", ifc);
else
printf("NULL");
}
printf(") = %s\n", errstr);
}
int
main(int argc, char *argv[])
{
struct ifreq *ifr = tail_alloc(2 * sizeof(*ifr));
TAIL_ALLOC_OBJECT_CONST_PTR(struct ifconf, ifc);
struct sockaddr_in addr;
int fd;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror_msg_and_skip("socket AF_INET");
gifconf_ioctl(fd, NULL, false);
gifconf_ioctl(fd, ifc + 1, false);
ifc->ifc_len = 3141592653U;
ifc->ifc_buf = NULL;
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 0;
ifc->ifc_buf = (char *) (ifr + 2);
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 1;
ifc->ifc_buf = (char *) (ifr + 1);
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 1 * sizeof(*ifr);
ifc->ifc_buf = (char *) (ifr + 1);
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 2 * sizeof(*ifr);
ifc->ifc_buf = (char *) (ifr + 1);
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 2 * sizeof(*ifr) + 2;
ifc->ifc_buf = (char *) ifr;
gifconf_ioctl(fd, ifc, true);
ifc->ifc_len = 3 * sizeof(*ifr) + 4;
ifc->ifc_buf = (char *) ifr;
gifconf_ioctl(fd, ifc, true);
puts("+++ exited with 0 +++");
return 0;
}