Merge pull request #464 from correabuscar/osx_replace__getnameinfo__with__inet_ntop

osx: replace getnameinfo with inet_ntop

Author: aristocratos

src/osx/btop_collect.cpp

@@ -41,6 +41,7 @@ tab-size = 4
 #include <sys/statvfs.h>
 #include <sys/sysctl.h>
 #include <sys/types.h>
+#include <netinet/in.h> // for inet_ntop
 #include <unistd.h>
 #include <stdexcept>
 
@@ -863,7 +864,9 @@ namespace Net {
 				return empty_net;
 			}
 			int family = 0;
-			char ip[NI_MAXHOST];
+			static_assert(INET6_ADDRSTRLEN >= INET_ADDRSTRLEN); // 46 >= 16, compile-time assurance.
+			enum { IPBUFFER_MAXSIZE = INET6_ADDRSTRLEN }; // manually using the known biggest value, guarded by the above static_assert
+			char ip[IPBUFFER_MAXSIZE];
 			interfaces.clear();
 			string ipv4, ipv6;
 
@@ -884,16 +887,26 @@ namespace Net {
 				}
 				//? Get IPv4 address
 				if (family == AF_INET) {
-					if (net[iface].ipv4.empty() and
-						getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), ip, NI_MAXHOST, NULL, 0, NI_NUMERICHOST) == 0)
-						net[iface].ipv4 = ip;
+					if (net[iface].ipv4.empty()) {
+						if (NULL != inet_ntop(family, &(reinterpret_cast<struct sockaddr_in*>(ifa->ifa_addr)->sin_addr), ip, IPBUFFER_MAXSIZE)) {
+							net[iface].ipv4 = ip;
+						} else {
+							int errsv = errno;
+							Logger::error("Net::collect() -> Failed to convert IPv4 to string for iface " + string(iface) + ", errno: " + strerror(errsv));
+						}
+					}
 				}
 				//? Get IPv6 address
 				else if (family == AF_INET6) {
-					if (net[iface].ipv6.empty() and
-						getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), ip, NI_MAXHOST, NULL, 0, NI_NUMERICHOST) == 0)
-						net[iface].ipv6 = ip;
-				}
+					if (net[iface].ipv6.empty()) {
+						if (NULL != inet_ntop(family, &(reinterpret_cast<struct sockaddr_in6*>(ifa->ifa_addr)->sin6_addr), ip, IPBUFFER_MAXSIZE)) {
+							net[iface].ipv6 = ip;
+						} else {
+							int errsv = errno;
+							Logger::error("Net::collect() -> Failed to convert IPv6 to string for iface " + string(iface) + ", errno: " + strerror(errsv));
+						}
+					}
+				} // else, ignoring family==AF_LINK (see man 3 getifaddrs)
 			}
 
 			unordered_flat_map<string, std::tuple<uint64_t, uint64_t>> ifstats;