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Report IPv4 and IPv6 addresses resolved for each host

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Previously, we would only request IPv4 addresses by default, or only
IPv6 when scanning with -6. Now, we'll request both (by not passing an
address family in the hints to getaddrinfo) and report them all in the
"Other addresses" line. This should encourage more users to scan with
-6. Additionally, it allows us to catch and report attempts to scan
IPv6-only hosts via IPv4, where previously we would just say "Failed to
resolve"

Closes #76
This commit is contained in:
dmiller
2015-03-11 04:14:26 +00:00
parent fbbb64a190
commit c0628fd141
2 changed files with 37 additions and 8 deletions
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32
TargetGroup.cc
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@@ -294,10 +294,20 @@ bail:
return NULL;
}
/* Returns the first address which matches the address family af */
static const struct sockaddr_storage *first_af_address(const std::list<struct sockaddr_storage> *addrs, int af) {
for (std::list<struct sockaddr_storage>::const_iterator it = addrs->begin(), end = addrs->end(); it != end; ++it) {
if (it->ss_family == af) {
return &*it;
}
}
return NULL;
}
bool NetBlock::is_resolved_address(const struct sockaddr_storage *ss) const {
if (this->resolvedaddrs.empty())
return false;
return sockaddr_storage_equal(&*this->resolvedaddrs.begin(), ss);
return sockaddr_storage_equal(first_af_address(&this->resolvedaddrs, ss->ss_family), ss);
}
NetBlockIPv4Ranges::NetBlockIPv4Ranges() {
@@ -610,10 +620,11 @@ NetBlock *NetBlockHostname::resolve() const {
struct addrinfo *addrs, *addr;
std::list<struct sockaddr_storage> resolvedaddrs;
NetBlock *netblock;
const struct sockaddr_storage *sp = NULL;
struct sockaddr_storage ss;
size_t sslen;
addrs = resolve_all(this->hostname.c_str(), this->af);
addrs = resolve_all(this->hostname.c_str(), AF_UNSPEC);
for (addr = addrs; addr != NULL; addr = addr->ai_next) {
if (addr->ai_addrlen < sizeof(ss)) {
memcpy(&ss, addr->ai_addr, addr->ai_addrlen);
@@ -626,7 +637,22 @@ NetBlock *NetBlockHostname::resolve() const {
if (resolvedaddrs.empty())
return NULL;
ss = *resolvedaddrs.begin();
sp = first_af_address(&resolvedaddrs, this->af);
if (sp == NULL or sp->ss_family != this->af) {
switch (this->af) {
case AF_INET:
error("Warning: Hostname %s resolves, but not to any IPv4 address. Try scanning with -6", this->hostname.c_str());
break;
case AF_INET6:
error("Warning: Hostname %s resolves, but not to any IPv6 address. Try scanning without -6", this->hostname.c_str());
break;
default:
error("Warning: Unknown address family: %d", this->af);
break;
}
return NULL;
}
ss = *sp;
sslen = sizeof(ss);
if (resolvedaddrs.size() > 1 && o.verbose > 1) {