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Rewrite ifaddrs#getifaddrs_INET.

Browse source 
The old implementation was unnecessarily complex, and using the wrong ioctl
for point-to-point destination addresses.

Bug: http://b/27313259
Change-Id: I9cabd17e414ce42b115037a3f828d79843f604f9
This commit is contained in:
Elliott Hughes 2016-02-29 13:31:59 -08:00
parent 17866357c5
commit bf97770a86
1 changed files with 67 additions and 38 deletions
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109
tests/ifaddrs_test.cpp
View file

@ -107,31 +107,8 @@ TEST(ifaddrs, getifaddrs_interfaces) {
sys_class_net.begin()));
}
TEST(ifaddrs, getifaddrs_INET) {
std::multimap<std::string, in_addr_t> inetaddrs;
std::multimap<std::string, in_addr_t> broadinetaddrs;
// Collect the IPv4 addresses for each interface.
ifaddrs* addrs;
ASSERT_EQ(0, getifaddrs(&addrs));
for (ifaddrs* addr = addrs; addr != nullptr; addr = addr->ifa_next) {
if (addr->ifa_name && addr->ifa_addr && addr->ifa_addr->sa_family == AF_INET) {
auto sock = reinterpret_cast<sockaddr_in*>(addr->ifa_addr);
inetaddrs.emplace(std::string(addr->ifa_name), sock->sin_addr.s_addr);
}
if (addr->ifa_name && addr->ifa_broadaddr && addr->ifa_broadaddr->sa_family == AF_INET) {
auto sock = reinterpret_cast<sockaddr_in*>(addr->ifa_broadaddr);
broadinetaddrs.emplace(std::string(addr->ifa_name), sock->sin_addr.s_addr);
}
}
freeifaddrs(addrs);
// Check that the addresses returned by the SIOCGIFADDR and SIOCGIFBRDADDR ioctls
// are in our collections.
auto check_inet_agrees = [&](std::multimap<std::string, in_addr_t> addrs, int request)->void {
for (auto it = addrs.begin(); it != addrs.end(); ) {
std::string if_name(it->first);
static void CheckAddressIsInSet(const std::string& if_name, bool unicast,
const std::set<in_addr_t>& addrs) {
ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_addr.sa_family = AF_INET;
@ -139,25 +116,46 @@ TEST(ifaddrs, getifaddrs_INET) {
int fd = socket(AF_INET, SOCK_DGRAM, 0);
ASSERT_TRUE(fd != -1);
int request = SIOCGIFADDR;
if (!unicast) {
// For non-unicast, the specific ioctl to use depends on whether the IFF_BROADCAST flag is set.
ASSERT_EQ(0, ioctl(fd, SIOCGIFFLAGS, &ifr)) << if_name << ' ' << strerror(errno);
request = ((ifr.ifr_flags & IFF_BROADCAST) != 0) ? SIOCGIFBRDADDR : SIOCGIFDSTADDR;
}
ASSERT_EQ(0, ioctl(fd, request, &ifr)) << if_name << ' ' << strerror(errno);
close(fd);
sockaddr_in* sock = reinterpret_cast<sockaddr_in*>(&ifr.ifr_addr);
in_addr_t addr = sock->sin_addr.s_addr;
bool found = false;
for (auto ub = addrs.upper_bound(it->first); it != ub; ++it) {
if (it->second == addr) {
found = true;
break;
}
}
EXPECT_TRUE(found) << if_name;
}
};
EXPECT_TRUE(addrs.find(addr) != addrs.end()) << if_name << ' ' << std::hex << ntohl(addr);
}
check_inet_agrees(inetaddrs, SIOCGIFADDR);
check_inet_agrees(broadinetaddrs, SIOCGIFBRDADDR);
TEST(ifaddrs, getifaddrs_INET) {
std::map<std::string, std::set<in_addr_t>> inet_addrs;
std::map<std::string, std::set<in_addr_t>> broad_addrs;
// Collect the IPv4 addresses for each interface.
ifaddrs* addrs;
ASSERT_EQ(0, getifaddrs(&addrs));
for (ifaddrs* addr = addrs; addr != nullptr; addr = addr->ifa_next) {
if (addr->ifa_name && addr->ifa_addr && addr->ifa_addr->sa_family == AF_INET) {
auto sock = reinterpret_cast<sockaddr_in*>(addr->ifa_addr);
inet_addrs[addr->ifa_name].insert(sock->sin_addr.s_addr);
}
if (addr->ifa_name && addr->ifa_broadaddr && addr->ifa_broadaddr->sa_family == AF_INET) {
auto sock = reinterpret_cast<sockaddr_in*>(addr->ifa_broadaddr);
broad_addrs[addr->ifa_name].insert(sock->sin_addr.s_addr);
}
}
freeifaddrs(addrs);
// Check that the addresses returned by the SIOCGIFADDR and SIOCGIFBRDADDR/SIOCGIFDSTADDR ioctls
// are in our collections.
for (const auto& it : inet_addrs) CheckAddressIsInSet(it.first, true, it.second);
for (const auto& it : broad_addrs) CheckAddressIsInSet(it.first, false, it.second);
}
static void print_sockaddr_ll(const char* what, const sockaddr* p) {
@ -183,7 +181,7 @@ static void print_sockaddr_inet(const char* what, const sockaddr* addr) {
printf("\t\t%s: <%s>\n", what, host);
}
static const char* family_to_name(int family) {
static const char* FamilyToName(int family) {
if (family == AF_INET) return "AF_INET";
if (family == AF_INET6) return "AF_INET6";
if (family == AF_PACKET) return "AF_PACKET";
@ -191,6 +189,36 @@ static const char* family_to_name(int family) {
return "?";
}
static std::string FlagsToString(short flags) {
std::string result;
if ((flags & IFF_UP) != 0) result += " UP";
if ((flags & IFF_BROADCAST) != 0) result += " BROADCAST";
if ((flags & IFF_DEBUG) != 0) result += " DEBUG";
if ((flags & IFF_LOOPBACK) != 0) result += " LOOPBACK";
if ((flags & IFF_POINTOPOINT) != 0) result += " POINTOPOINT";
if ((flags & IFF_NOTRAILERS) != 0) result += " NOTRAILERS";
if ((flags & IFF_RUNNING) != 0) result += " RUNNING";
if ((flags & IFF_NOARP) != 0) result += " NOARP";
if ((flags & IFF_PROMISC) != 0) result += " PROMISC";
if ((flags & IFF_ALLMULTI) != 0) result += " ALLMULTI";
if ((flags & IFF_MASTER) != 0) result += " MASTER";
if ((flags & IFF_SLAVE) != 0) result += " SLAVE";
if ((flags & IFF_MULTICAST) != 0) result += " MULTICAST";
if ((flags & IFF_PORTSEL) != 0) result += " PORTSEL";
if ((flags & IFF_AUTOMEDIA) != 0) result += " AUTOMEDIA";
if ((flags & IFF_DYNAMIC) != 0) result += " DYNAMIC";
#if defined(IFF_LOWER_UP)
if ((flags & IFF_LOWER_UP) != 0) result += " LOWER_UP";
#endif
#if defined(IFF_DORMANT)
if ((flags & IFF_DORMANT) != 0) result += " DORMANT";
#endif
#if defined(IFF_ECHO)
if ((flags & IFF_ECHO) != 0) result += " ECHO";
#endif
return result;
}
// Not really a test, but a useful debugging tool.
TEST(ifaddrs, dump) {
ifaddrs* addrs;
@ -201,8 +229,9 @@ TEST(ifaddrs, dump) {
ifa->ifa_broadaddr ? ifa->ifa_broadaddr->sa_family : AF_UNSPEC;
printf("\t%s\n"
"\t\t%s (%d) flags=%#x\n",
ifa->ifa_name, family_to_name(family), family, ifa->ifa_flags);
"\t\t%s (%d) flags=%#x%s\n",
ifa->ifa_name, FamilyToName(family), family,
ifa->ifa_flags, FlagsToString(ifa->ifa_flags).c_str());
if (family == AF_PACKET) {
if (ifa->ifa_addr) print_sockaddr_ll("hwaddr", ifa->ifa_addr);