Update anetPeerToString to handle AF_INET6 addrs.

Change the sockaddr_in to sockaddr_storage which is capable of storing
both AF_INET and AF_INET6 sockets. Uses the sockaddr_storage ss_family
to correctly return the printable IP address and port.

src/anet.c

@@ -463,7 +463,7 @@ int anetUnixAccept(char *err, int s) {
 }
 
 int anetPeerToString(int fd, char *ip, size_t ip_len, int *port) {
-    struct sockaddr_in sa;
+    struct sockaddr_storage sa;
     socklen_t salen = sizeof(sa);
 
     if (getpeername(fd,(struct sockaddr*)&sa,&salen) == -1) {
@@ -472,13 +472,20 @@ int anetPeerToString(int fd, char *ip, size_t ip_len, int *port) {
         ip[1] = '\0';
         return -1;
     }
-    if (ip) inet_ntop(sa.sin_family,(void*)&(sa.sin_addr),ip,ip_len);
-    if (port) *port = ntohs(sa.sin_port);
+    if (sa.ss_family == AF_INET) {
+        struct sockaddr_in *s = (struct sockaddr_in *)&sa;
+        if (ip) inet_ntop(AF_INET,(void*)&(s->sin_addr),ip,ip_len);
+        if (port) *port = ntohs(s->sin_port);
+    } else {
+        struct sockaddr_in6 *s = (struct sockaddr_in6 *)&sa;
+        if (ip) inet_ntop(AF_INET6,(void*)&(s->sin6_addr),ip,ip_len);
+        if (port) *port = ntohs(s->sin6_port);
+    }
     return 0;
 }
 
 int anetSockName(int fd, char *ip, size_t ip_len, int *port) {
-    struct sockaddr_in sa;
+    struct sockaddr_storage sa;
     socklen_t salen = sizeof(sa);
 
     if (getsockname(fd,(struct sockaddr*)&sa,&salen) == -1) {
@@ -487,7 +494,14 @@ int anetSockName(int fd, char *ip, size_t ip_len, int *port) {
         ip[1] = '\0';
         return -1;
     }
-    if (ip) inet_ntop(sa.sin_family,(void*)&(sa.sin_addr),ip,ip_len);
-    if (port) *port = ntohs(sa.sin_port);
+    if (sa.ss_family == AF_INET) {
+        struct sockaddr_in *s = (struct sockaddr_in *)&sa;
+        if (ip) inet_ntop(AF_INET,(void*)&(s->sin_addr),ip,ip_len);
+        if (port) *port = ntohs(s->sin_port);
+    } else {
+        struct sockaddr_in6 *s = (struct sockaddr_in6 *)&sa;
+        if (ip) inet_ntop(AF_INET6,(void*)&(s->sin6_addr),ip,ip_len);
+        if (port) *port = ntohs(s->sin6_port);
+    }
     return 0;
 }