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/*
* Copyright (C) 2016 Jens Georg <mail@jensge.org>
*
* Author: Jens Georg <mail@jensge.org>
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
*/
#include <config.h>
#include "gssdp-net.h"
#include <glib.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#ifdef __linux__
#include <net/if_arp.h>
#endif
#include <android/log.h>
gboolean
gssdp_net_init (GError **error)
{
return TRUE;
}
void
gssdp_net_shutdown (void)
{
}
int
gssdp_net_query_ifindex (GSSDPNetworkDevice *device)
{
#if defined(HAVE_IFNAMETOINDEX)
return if_nametoindex (device->iface_name);
#elif defined(HAVE_SIOCGIFINDEX)
int fd;
int result;
struct ifreq ifr;
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
return -1;
memset (&ifr, 0, sizeof(struct ifreq));
strncpy (ifr.ifr_ifrn.ifrn_name, device->iface_name, IFNAMSIZ);
result = ioctl (fd, SIOCGIFINDEX, (char *)&ifr);
close (fd);
if (result == 0)
return ifr.ifr_ifindex;
else
return -1;
#else
return -1;
#endif
}
char *
gssdp_net_mac_lookup (GSSDPNetworkDevice *device, const char *ip_address)
{
#if defined(__linux__)
struct arpreq req;
struct sockaddr_in *sin;
int fd = -1;
memset (&req, 0, sizeof (req));
/* FIXME: Update when we support IPv6 properly */
sin = (struct sockaddr_in *) &req.arp_pa;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = inet_addr (ip_address);
/* copy name, leave place for nul terminator */;
strncpy (req.arp_dev, device->iface_name, sizeof (req.arp_dev) - 1);
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
return g_strdup (ip_address);
if (ioctl (fd, SIOCGARP, (caddr_t) &req) < 0) {
return NULL;
}
close (fd);
if (req.arp_flags & ATF_COM) {
unsigned char *buf = (unsigned char *) req.arp_ha.sa_data;
return g_strdup_printf ("%02X:%02X:%02X:%02X:%02X:%02X",
buf[0],
buf[1],
buf[2],
buf[3],
buf[4],
buf[5]);
}
return g_strdup (ip_address);
#else
return g_strdup (ip_address);
#endif
}
gboolean
gssdp_net_get_host_ip (GSSDPNetworkDevice *device, GError **error)
{
struct ifreq *ifaces = NULL;
struct ifreq *iface = NULL;
struct ifreq tmp_iface;
struct ifconf ifconfigs;
struct sockaddr_in *address, *netmask;
struct in_addr net_address;
uint32_t ip;
int if_buf_size, sock, i, if_num;
GList *if_ptr, *if_list = NULL;
if ((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
__android_log_write (ANDROID_LOG_WARN,
"gssdp",
"Couldn't create socket");
return FALSE;
}
/* Fill ifaces with the available interfaces
* we incrementally proceed in chunks of 4
* till getting the full list
*/
if_buf_size = 0;
do {
if_buf_size += 4 * sizeof (struct ifreq);
ifaces = g_realloc (ifaces, if_buf_size);
ifconfigs.ifc_len = if_buf_size;
ifconfigs.ifc_buf = (char *) ifaces;
/* FIXME: IPv4 only. This ioctl only deals with AF_INET */
if (ioctl (sock, SIOCGIFCONF, &ifconfigs) == -1) {
__android_log_print (ANDROID_LOG_WARN, "gssdp",
"Couldn't get list of devices. Asked for: %d",
if_buf_size / sizeof (struct ifreq));
goto fail;
}
} while (ifconfigs.ifc_len >= if_buf_size);
if_num = ifconfigs.ifc_len / sizeof (struct ifreq);
if (!device->iface_name) {
__android_log_print (ANDROID_LOG_DEBUG, "gssdp",
"Got list of %d interfaces. Looking for a suitable one",
if_num);
} else {
__android_log_print (ANDROID_LOG_DEBUG, "gssdp",
"List of %d interfaces ready. Now finding %s",
if_num, device->iface_name);
}
/* Buildup prioritized interface list
*/
for (i = 0; i < if_num; i++) {
address = (struct sockaddr_in *) &(ifaces[i].ifr_addr);
__android_log_print (ANDROID_LOG_DEBUG,
"gssdp",
"Trying interface: %s",
ifaces[i].ifr_name);
if (!address->sin_addr.s_addr) {
__android_log_write (ANDROID_LOG_DEBUG, "gssdp",
"No configured address. Discarding");
continue;
}
memcpy (&tmp_iface, &ifaces[i], sizeof (struct ifreq));
if (ioctl (sock, SIOCGIFFLAGS, &tmp_iface) == -1) {
__android_log_write (ANDROID_LOG_DEBUG, "gssdp",
"Couldn't get flags. Discarding");
continue;
}
/* If an specific interface query was passed over.. */
if (device->iface_name &&
g_strcmp0 (device->iface_name, tmp_iface.ifr_name)) {
continue;
} else if (!(tmp_iface.ifr_flags & IFF_UP) ||
tmp_iface.ifr_flags & IFF_POINTOPOINT) {
continue;
}
/* Prefer non loopback */
if (ifaces[i].ifr_flags & IFF_LOOPBACK)
if_list = g_list_append (if_list, ifaces + i);
else
if_list = g_list_prepend (if_list, ifaces + i);
if (device->iface_name)
break;
}
if (!g_list_length (if_list)) {
__android_log_write (ANDROID_LOG_DEBUG,
"gssdp",
"No usable interfaces found");
goto fail;
}
/* Fill device with data from the first interface
* we can get complete config info for and return
*/
for (if_ptr = if_list; if_ptr != NULL;
if_ptr = g_list_next (if_ptr)) {
iface = (struct ifreq *) if_ptr->data;
address = (struct sockaddr_in *) &(iface->ifr_addr);
netmask = (struct sockaddr_in *) &(iface->ifr_netmask);
device->host_ip = g_malloc0 (INET_ADDRSTRLEN);
if (inet_ntop (AF_INET, &(address->sin_addr),
device->host_ip, INET_ADDRSTRLEN) == NULL) {
__android_log_print (ANDROID_LOG_INFO,
"gssdp",
"Failed to get ip for: %s, %s",
iface->ifr_name,
strerror (errno));
g_free (device->host_ip);
device->host_ip = NULL;
continue;
}
device->host_addr = g_inet_address_new_from_string (device->host_ip);
ip = address->sin_addr.s_addr;
if (ioctl (sock, SIOCGIFNETMASK, iface) == -1) {
__android_log_write (ANDROID_LOG_DEBUG, "gssdp",
"Couldn't get netmask. Discarding");
g_free (device->host_ip);
device->host_ip = NULL;
continue;
}
memcpy (&device->mask, netmask, sizeof (struct sockaddr_in));
if (device->network == NULL) {
device->network = g_malloc0 (INET_ADDRSTRLEN);
net_address.s_addr = ip & netmask->sin_addr.s_addr;
if (inet_ntop (AF_INET, &net_address,
device->network, INET_ADDRSTRLEN) == NULL) {
__android_log_print (ANDROID_LOG_WARN, "gssdp",
"Failed to get nw for: %s, %s",
iface->ifr_name, strerror (errno));
g_clear_pointer (&device->host_ip, g_free);
g_clear_pointer (&device->network, g_free);
g_clear_object (&device->host_addr);
continue;
}
}
if (!device->iface_name)
device->iface_name = g_strdup (iface->ifr_name);
goto success;
}
__android_log_write (ANDROID_LOG_WARN, "gssdp",
"Traversed whole list without finding a configured device");
fail:
__android_log_write (ANDROID_LOG_WARN,
"gssdp",
"Failed to get configuration for device");
g_free (ifaces);
g_list_free (if_list);
close (sock);
return FALSE;
success:
__android_log_print (ANDROID_LOG_DEBUG, "gssdp",
"Returned config params for device: %s ip: %s network: %s",
device->iface_name, device->host_ip, device->network);
g_free (ifaces);
g_list_free (if_list);
close (sock);
return TRUE;
}
GList *
gssdp_net_list_devices (void)
{
return NULL;
}
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