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/*
* Check decoding of SIOCGIFCONF command of ioctl syscall.
*
* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.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(const int val)
{
printf("%d", val);
if (val > 0 && val % (int) sizeof(struct ifreq) == 0)
printf(" /* %d * sizeof(struct ifreq) */",
val / (int) sizeof(struct ifreq));
}
static void
print_ifconf(const struct ifconf *const ifc, const int in_len,
const char *const in_buf, const 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(const int fd, struct ifconf *const ifc, const bool ifc_valid)
{
const int in_len = ifc_valid ? ifc->ifc_len : 0;
const char *const in_buf = ifc_valid ? ifc->ifc_buf : NULL;
long rc = ioctl(fd, SIOCGIFCONF, ifc);
const char *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 *const ifr = tail_alloc(2 * sizeof(*ifr));
TAIL_ALLOC_OBJECT_CONST_PTR(struct ifconf, ifc);
const int fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 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;
}
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