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#include "common/netif.h"
#include "common/io.h"
#include "common/mallocHelper.h"
#include <arpa/inet.h>
#include <net/if.h>
#include <net/route.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <stdio.h>
// loosely based on Haiku's src/bin/network/route/route.cpp
bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result) {
FF_AUTO_CLOSE_FD int pfRoute = socket(AF_INET, SOCK_RAW, AF_INET);
if (pfRoute < 0) {
return false;
}
struct ifconf config;
config.ifc_len = sizeof(config.ifc_value);
if (ioctl(pfRoute, SIOCGRTSIZE, &config, sizeof(struct ifconf)) < 0) {
return false;
}
int size = config.ifc_value;
if (size <= 0) {
return false;
}
FF_AUTO_FREE void* buffer = malloc((size_t) size);
if (buffer == NULL) {
return false;
}
config.ifc_len = size;
config.ifc_buf = buffer;
if (ioctl(pfRoute, SIOCGRTTABLE, &config, sizeof(struct ifconf)) < 0) {
return false;
}
struct ifreq* interface = (struct ifreq*) buffer;
struct ifreq* end = (struct ifreq*) ((uint8_t*) buffer + size);
while (interface < end) {
if (interface->ifr_route.flags & RTF_DEFAULT) {
// interface->ifr_metric?
strlcpy(result->ifName, interface->ifr_name, IF_NAMESIZE);
result->ifIndex = if_nametoindex(interface->ifr_name);
if (interface->ifr_route.source) {
result->preferredSourceAddrV4 = ((struct sockaddr_in*) interface->ifr_route.source)->sin_addr.s_addr;
}
return true;
}
size_t addressSize = 0;
if (interface->ifr_route.destination != NULL) {
addressSize += interface->ifr_route.destination->sa_len;
}
if (interface->ifr_route.mask != NULL) {
addressSize += interface->ifr_route.mask->sa_len;
}
if (interface->ifr_route.gateway != NULL) {
addressSize += interface->ifr_route.gateway->sa_len;
}
interface = (struct ifreq*) ((addr_t) interface + IF_NAMESIZE + sizeof(struct route_entry) + addressSize);
}
return false;
}
bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result) {
FF_AUTO_CLOSE_FD int pfRoute = socket(AF_INET6, SOCK_RAW, AF_INET6);
if (pfRoute < 0) {
return false;
}
struct ifconf config;
config.ifc_len = sizeof(config.ifc_value);
if (ioctl(pfRoute, SIOCGRTSIZE, &config, sizeof(struct ifconf)) < 0) {
return false;
}
int size = config.ifc_value;
if (size <= 0) {
return false;
}
FF_AUTO_FREE void* buffer = malloc((size_t) size);
if (buffer == NULL) {
return false;
}
config.ifc_len = size;
config.ifc_buf = buffer;
if (ioctl(pfRoute, SIOCGRTTABLE, &config, sizeof(struct ifconf)) < 0) {
return false;
}
struct ifreq* interface = (struct ifreq*) buffer;
struct ifreq* end = (struct ifreq*) ((uint8_t*) buffer + size);
while (interface < end) {
if (interface->ifr_route.flags & RTF_DEFAULT) {
strlcpy(result->ifName, interface->ifr_name, IF_NAMESIZE);
result->ifIndex = if_nametoindex(interface->ifr_name);
return true;
}
size_t addressSize = 0;
if (interface->ifr_route.destination != NULL) {
addressSize += interface->ifr_route.destination->sa_len;
}
if (interface->ifr_route.mask != NULL) {
addressSize += interface->ifr_route.mask->sa_len;
}
if (interface->ifr_route.gateway != NULL) {
addressSize += interface->ifr_route.gateway->sa_len;
}
interface = (struct ifreq*) ((addr_t) interface + IF_NAMESIZE + sizeof(struct route_entry) + addressSize);
}
return false;
}
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