libnetdevice: implement ipv4 get/set/add operations
Bug: 372814636
Test: verified with b/372814636 test service
Change-Id: I59af9750f4ba46085f0c7a2a5681243beb68cf39
diff --git a/automotive/can/1.0/default/libnetdevice/include/libnetdevice/libnetdevice.h b/automotive/can/1.0/default/libnetdevice/include/libnetdevice/libnetdevice.h
index 4c5be04..75655d5 100644
--- a/automotive/can/1.0/default/libnetdevice/include/libnetdevice/libnetdevice.h
+++ b/automotive/can/1.0/default/libnetdevice/include/libnetdevice/libnetdevice.h
@@ -112,6 +112,37 @@
bool down(std::string_view ifname);
/**
+ * Retrieves all IPv4 addresses of a given interface.
+ *
+ * \param ifname Interface to query
+ * \return list of IPv4 addresses of this interface
+ */
+std::set<std::string> getAllAddr4(std::string_view ifname);
+
+/**
+ * Set IPv4 address on a given interface.
+ *
+ * This function will overwrite any other existing IPv4 addresses.
+ *
+ * \param ifname Interface to modify
+ * \param addr IPv4 address to set
+ * \return true in case of success, false otherwise
+ */
+bool setAddr4(std::string_view ifname, std::string_view addr);
+
+/**
+ * Add new IPv4 address to a given interface.
+ *
+ * Please note this doesn't remove existing IPv4 addresses.
+ *
+ * \param ifname Interface to modify
+ * \param addr IPv4 address to add
+ * \param prefixlen IPv4 netmask length
+ * \return true in case of success, false otherwise
+ */
+bool addAddr4(std::string_view ifname, std::string_view addr, uint8_t prefixlen = 24);
+
+/**
* Adds virtual link.
*
* \param dev the name of the new virtual device
diff --git a/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp b/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
index d655259..4c4b77b 100644
--- a/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
+++ b/automotive/can/1.0/default/libnetdevice/libnetdevice.cpp
@@ -23,9 +23,12 @@
#include <libnl++/MessageFactory.h>
#include <libnl++/Socket.h>
+#include <arpa/inet.h>
+#include <ifaddrs.h>
#include <linux/can.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
+#include <netdb.h>
#include <sys/ioctl.h>
#include <algorithm>
@@ -45,6 +48,7 @@
bool up(std::string_view ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFFLAGS, ifr)) return false;
+ if (ifr.ifr_flags & IFF_UP) return true;
ifr.ifr_flags |= IFF_UP;
return ifreqs::send(SIOCSIFFLAGS, ifr);
}
@@ -52,10 +56,69 @@
bool down(std::string_view ifname) {
auto ifr = ifreqs::fromName(ifname);
if (!ifreqs::send(SIOCGIFFLAGS, ifr)) return false;
+ if (!(ifr.ifr_flags & IFF_UP)) return true;
ifr.ifr_flags &= ~IFF_UP;
return ifreqs::send(SIOCSIFFLAGS, ifr);
}
+static std::string toString(const sockaddr* addr) {
+ char host[NI_MAXHOST];
+ socklen_t addrlen = (addr->sa_family == AF_INET) ? sizeof(sockaddr_in) : sizeof(sockaddr_in6);
+ auto res = getnameinfo(addr, addrlen, host, sizeof(host), nullptr, 0, NI_NUMERICHOST);
+ CHECK(res == 0) << "getnameinfo failed: " << gai_strerror(res);
+ return host;
+}
+
+static std::unique_ptr<ifaddrs, decltype(&freeifaddrs)> getifaddrs() {
+ ifaddrs* addrs = nullptr;
+ CHECK(getifaddrs(&addrs) == 0) << "getifaddrs failed: " << strerror(errno);
+ return {addrs, freeifaddrs};
+}
+
+std::set<std::string> getAllAddr4(std::string_view ifname) {
+ std::set<std::string> addresses;
+ auto addrs = getifaddrs();
+ for (ifaddrs* addr = addrs.get(); addr != nullptr; addr = addr->ifa_next) {
+ if (ifname != addr->ifa_name) continue;
+ if (addr->ifa_addr == nullptr) continue;
+ if (addr->ifa_addr->sa_family != AF_INET) continue;
+ addresses.insert(toString(addr->ifa_addr));
+ }
+ return addresses;
+}
+
+static in_addr_t inetAddr(std::string_view addr) {
+ auto addrn = inet_addr(std::string(addr).c_str());
+ CHECK(addrn != INADDR_NONE) << "Invalid address " << addr;
+ return addrn;
+}
+
+bool setAddr4(std::string_view ifname, std::string_view addr) {
+ auto ifr = ifreqs::fromName(ifname);
+
+ struct sockaddr_in* ifrAddr = reinterpret_cast<sockaddr_in*>(&ifr.ifr_addr);
+ ifrAddr->sin_family = AF_INET;
+ ifrAddr->sin_addr.s_addr = inetAddr(addr);
+
+ return ifreqs::send(SIOCSIFADDR, ifr);
+}
+
+bool addAddr4(std::string_view ifname, std::string_view addr, uint8_t prefixlen) {
+ android::nl::MessageFactory<ifaddrmsg> req(
+ RTM_NEWADDR, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK);
+ req->ifa_family = AF_INET;
+ req->ifa_prefixlen = prefixlen;
+ req->ifa_flags = IFA_F_SECONDARY;
+ req->ifa_index = nametoindex(ifname);
+
+ auto addrn = inetAddr(addr);
+ req.add(IFLA_ADDRESS, addrn);
+ req.add(IFLA_BROADCAST, addrn);
+
+ nl::Socket sock(NETLINK_ROUTE);
+ return sock.send(req) && sock.receiveAck(req);
+}
+
bool add(std::string_view dev, std::string_view type) {
nl::MessageFactory<ifinfomsg> req(RTM_NEWLINK,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK);