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Add Utils::route6_entries on OSX/BSD

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This commit is contained in:
Matias Fontanini
2016-03-07 19:40:38 -08:00
parent 4dcef0f15d
commit 42b6c40433
3 changed files with 121 additions and 35 deletions
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31
examples/route_table.cpp
View File

@@ -40,13 +40,30 @@ using std::vector;
using namespace Tins;
int main() {
vector<Utils::RouteEntry> entries = Utils::route_entries();
for (size_t i = 0; i < entries.size(); ++i) {
vector<Utils::RouteEntry> v4_entries = Utils::route_entries();
cout << "IPv4 route table entries: " << endl
<< "========================= " << endl;
for (size_t i = 0; i < v4_entries.size(); ++i) {
cout << "Entry " << setw(2) << i << ": " << endl
<< "Interface: " << entries[i].interface << endl
<< "Destination: " << entries[i].destination << endl
<< "Gateway: " << entries[i].gateway << endl
<< "Genmask: " << entries[i].mask << endl
<< "Metric: " << entries[i].metric << endl << endl;
<< "Interface: " << v4_entries[i].interface << endl
<< "Destination: " << v4_entries[i].destination << endl
<< "Gateway: " << v4_entries[i].gateway << endl
<< "Genmask: " << v4_entries[i].mask << endl
<< "Metric: " << v4_entries[i].metric << endl << endl;
}
vector<Utils::Route6Entry> v6_entries = Utils::route6_entries();
if (!v6_entries.empty()) {
cout << endl
<< "IPv6 route table entries: " << endl
<< "========================= " << endl;
for (size_t i = 0; i < v6_entries.size(); ++i) {
cout << "Entry " << setw(2) << i << ": " << endl
<< "Interface: " << v6_entries[i].interface << endl
<< "Destination: " << v6_entries[i].destination << endl
<< "Gateway: " << v6_entries[i].gateway << endl
<< "Genmask: " << v6_entries[i].mask << endl
<< "Metric: " << v6_entries[i].metric << endl << endl;
}
}
}

2
include/tins/utils.h
View File

@@ -112,7 +112,7 @@ struct Route6Entry {
/**
* This route entry's next hop.
*/
IPv6Address next_hop;
IPv6Address gateway;
/**
* This route entry's metric.

123
src/utils.cpp
View File

@@ -110,7 +110,7 @@ addrinfo* resolve_domain(const string& to_resolve, int family) {
}
#if defined(BSD) || defined(__FreeBSD_kernel__)
vector<char> query_route_table() {
vector<char> query_route_table(int family) {
int mib[6];
vector<char> buf;
size_t len;
@@ -118,7 +118,7 @@ vector<char> query_route_table() {
mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[3] = family;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
@@ -133,20 +133,19 @@ vector<char> query_route_table() {
return buf;
}
template<typename ForwardIterator>
void parse_header(struct rt_msghdr* rtm, ForwardIterator iter) {
void parse_header(struct rt_msghdr* rtm, vector<sockaddr*>& addrs) {
char* ptr = (char *)(rtm + 1);
sockaddr* sa = 0;
for (int i = 0; i < RTAX_MAX; i++) {
if (rtm->rtm_addrs & (1 << i)) {
// Iterate from RTA_DST (0) to RTA_NETMASK (2)
for (int i = 0; i < 3; ++i) {
sockaddr* sa = 0;
if ((rtm->rtm_addrs & (1 << i)) != 0) {
sa = (struct sockaddr *)ptr;
ptr += sa->sa_len;
if (sa->sa_family == 0) {
sa = 0;
}
}
*iter++ = sa;
addrs[i] = sa;
}
}
#endif
@@ -194,27 +193,94 @@ HWAddress<6> resolve_hwaddr(IPv4Address ip, PacketSender& sender) {
vector<RouteEntry> route_entries() {
vector<RouteEntry> output;
vector<char> buffer = query_route_table();
vector<char> buffer = query_route_table(AF_INET);
char* next = &buffer[0], *end = &buffer[buffer.size()];
rt_msghdr* rtm;
vector<sockaddr*> sa(RTAX_MAX);
vector<sockaddr*> sa(32);
char iface_name[IF_NAMESIZE];
while (next < end) {
rtm = (rt_msghdr*)next;
parse_header(rtm, sa.begin());
if (sa[RTAX_DST] && sa[RTAX_GATEWAY] && if_indextoname(rtm->rtm_index, iface_name)) {
RouteEntry entry;
entry.destination = IPv4Address(((struct sockaddr_in *)sa[RTAX_DST])->sin_addr.s_addr);
entry.gateway = IPv4Address(((struct sockaddr_in *)sa[RTAX_GATEWAY])->sin_addr.s_addr);
if (sa[RTAX_GENMASK]) {
entry.mask = IPv4Address(((struct sockaddr_in *)sa[RTAX_GENMASK])->sin_addr.s_addr);
// Filter:
// * RTF_STATIC (only manually added routes)
if ((rtm->rtm_flags & (RTF_STATIC)) != 0) {
parse_header(rtm, sa);
if (sa[RTAX_DST] && sa[RTAX_GATEWAY] && if_indextoname(rtm->rtm_index, iface_name)) {
RouteEntry entry;
entry.destination = IPv4Address(((struct sockaddr_in *)sa[RTAX_DST])->sin_addr.s_addr);
entry.gateway = IPv4Address(((struct sockaddr_in *)sa[RTAX_GATEWAY])->sin_addr.s_addr);
if (sa[RTAX_NETMASK]) {
entry.mask = IPv4Address(((struct sockaddr_in *)sa[RTAX_NETMASK])->sin_addr.s_addr);
}
entry.interface = iface_name;
entry.metric = 0;
output.push_back(entry);
}
else {
entry.mask = IPv4Address(uint32_t());
}
next += rtm->rtm_msglen;
}
return output;
}
vector<Route6Entry> route6_entries() {
vector<Route6Entry> output;
vector<char> buffer = query_route_table(AF_INET6);
char* next = &buffer[0], *end = &buffer[buffer.size()];
rt_msghdr* rtm;
vector<sockaddr*> sa(9);
char iface_name[IF_NAMESIZE];
while (next < end) {
rtm = (rt_msghdr*)next;
// Filter protocol-cloned entries
if ((rtm->rtm_flags & RTF_WASCLONED) == 0 || (rtm->rtm_flags & RTF_PRCLONING) == 0) {
parse_header(rtm, sa);
if (sa[RTAX_DST] && sa[RTAX_GATEWAY] && if_indextoname(rtm->rtm_index, iface_name)) {
Route6Entry entry;
entry.destination = IPv6Address(((struct sockaddr_in6 *)sa[RTAX_DST])->sin6_addr.s6_addr);
entry.gateway = IPv6Address(((struct sockaddr_in6 *)sa[RTAX_GATEWAY])->sin6_addr.s6_addr);
int prefix_length = 0;
if (sa[RTAX_NETMASK]) {
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa[RTAX_NETMASK];
for (size_t i = 0; i < 16; ++i) {
uint8_t this_byte = sin->sin6_addr.s6_addr[i];
// Stop when we find a zero byte
if (this_byte == 0) {
break;
}
switch (this_byte) {
case 0xff:
prefix_length += 8;
break;
case 0xfe:
prefix_length += 7;
break;
case 0xfc:
prefix_length += 6;
break;
case 0xf8:
prefix_length += 5;
break;
case 0xf0:
prefix_length += 4;
break;
case 0xe0:
prefix_length += 3;
break;
case 0xc0:
prefix_length += 2;
break;
case 0x80:
prefix_length += 1;
break;
default:
break;
}
}
}
entry.mask = IPv6Address::from_prefix_length(prefix_length);
entry.interface = iface_name;
entry.metric = 0;
output.push_back(entry);
}
entry.interface = iface_name;
entry.metric = 0;
output.push_back(entry);
}
next += rtm->rtm_msglen;
}
@@ -225,9 +291,12 @@ vector<RouteEntry> route_entries() {
vector<RouteEntry> route_entries() {
vector<RouteEntry> output;
MIB_IPFORWARDTABLE table;
MIB_IPFORWARDTABLE* table;
ULONG size = 0;
GetIpForwardTable(AF_INET6, &table);
GetIpForwardTable(0, &size, 0);
vector<uint8_t> buffer(size);
table = (MIB_IPFORWARDTABLE*)&buffer[0];
GetIpForwardTable(table, &size, 0);
for (DWORD i = 0; i < table->dwNumEntries; i++) {
MIB_IPFORWARDROW* row = &table->table[i];
@@ -257,7 +326,7 @@ vector<Route6Entry> route6_entries() {
entry.interface = NetworkInterface::from_index(row->InterfaceIndex).name();
entry.destination = IPv6Address(row->DestinationPrefix.Prefix.Ipv6.sin6_addr.s6_addr);
entry.mask = IPv6Address::from_prefix_length(row->DestinationPrefix.PrefixLength);
entry.next_hop = IPv6Address(row->NextHop.Ipv6.sin6_addr.s6_addr);
entry.gateway = IPv6Address(row->NextHop.Ipv6.sin6_addr.s6_addr);
entry.metric = row->Metric;
output.push_back(entry);
}
@@ -322,7 +391,7 @@ vector<Route6Entry> route6_entries() {
from_hex(mask_length, temporary_int);
entry.mask = IPv6Address::from_prefix_length(temporary_int);
from_hex(next_hop, temporary);
entry.next_hop = IPv6Address((const uint8_t*)&temporary[0]);
entry.gateway = IPv6Address((const uint8_t*)&temporary[0]);
from_hex(metric, temporary_int);
entry.metric = temporary_int;
// Process flags