Allow compiling for Windows XP and higher.

[tinc] / lib / fake-getnameinfo.c

diff --git a/lib/fake-getnameinfo.c b/lib/fake-getnameinfo.c
index 6630dec..8047173 100644 (file)
--- a/lib/fake-getnameinfo.c
+++ b/lib/fake-getnameinfo.c
@@ -14,33 +14,42 @@
 #include "fake-getnameinfo.h"
 #include "fake-getaddrinfo.h"
 
-#ifndef HAVE_GETNAMEINFO
+#if !HAVE_DECL_GETNAMEINFO
 
 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
 {
        struct sockaddr_in *sin = (struct sockaddr_in *)sa;
        struct hostent *hp;
+       int len;
 
-       if(serv)
-               snprintf(serv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
+       if(sa->sa_family != AF_INET)
+               return EAI_FAMILY;
 
-       if(!host)
+       if(serv && servlen) {
+               len = snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
+               if(len < 0 || len >= servlen)
+                       return EAI_MEMORY;
+       }
+
+       if(!host || !hostlen)
                return 0;
 
        if(flags & NI_NUMERICHOST) {
-               strncpy(host, inet_ntoa(sin->sin_addr), sizeof(host));
+               len = snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
+               if(len < 0 || len >= hostlen)
+                       return EAI_MEMORY;
                return 0;
        }
 
        hp = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr), AF_INET);
        
-       if(!hp || !hp->h_name)
+       if(!hp || !hp->h_name || !hp->h_name[0])
                return EAI_NODATA;
        
-       if(strlen(hp->h_name) >= hostlen)
+       len = snprintf(host, hostlen, "%s", hp->h_name);
+       if(len < 0 || len >= hostlen)
                return EAI_MEMORY;
 
-       strncpy(host, hp->h_name, hostlen);
        return 0;
 }
 #endif /* !HAVE_GETNAMEINFO */