From 2236e05e518c9e317d82c027596bea5228725214 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sun, 17 Aug 2003 08:32:39 +0000
Subject: [PATCH] Fix fake getnameinfo() and check more arguments.

---
 lib/fake-gai-errnos.h  |  3 ++-
 lib/fake-getaddrinfo.c |  7 ++++++-
 lib/fake-getnameinfo.c | 23 ++++++++++++++++-------
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/lib/fake-gai-errnos.h b/lib/fake-gai-errnos.h
index fc65fa74..f54cf55c 100644
--- a/lib/fake-gai-errnos.h
+++ b/lib/fake-gai-errnos.h
@@ -5,10 +5,11 @@
  * See getaddrinfo.c and getnameinfo.c.
  */
 
-/* $Id: fake-gai-errnos.h,v 1.1.2.2 2003/07/12 17:41:45 guus Exp $ */
+/* $Id: fake-gai-errnos.h,v 1.1.2.3 2003/08/17 08:32:38 guus Exp $ */
 
 /* for old netdb.h */
 #ifndef EAI_NODATA
 #define EAI_NODATA	1
 #define EAI_MEMORY	2
+#define EAI_FAMILY	3
 #endif
diff --git a/lib/fake-getaddrinfo.c b/lib/fake-getaddrinfo.c
index 0c9fae94..161c826f 100644
--- a/lib/fake-getaddrinfo.c
+++ b/lib/fake-getaddrinfo.c
@@ -23,6 +23,8 @@ char *gai_strerror(int ecode)
 			return "No address associated with hostname";
 		case EAI_MEMORY:
 			return "Memory allocation failure";
+		case EAI_FAMILY:
+			return "Address family not supported";
 		default:
 			return "Unknown error";
 	}
@@ -67,6 +69,9 @@ int getaddrinfo(const char *hostname, const char *servname, const struct addrinf
 	int i;
 	uint16_t port = 0;
 
+	if(hints && hints->ai_family != AF_INET && hints->ai_family != AF_UNSPEC)
+		return EAI_FAMILY;
+
 	if (servname)
 		port = htons(atoi(servname));
 
@@ -82,7 +87,7 @@ int getaddrinfo(const char *hostname, const char *servname, const struct addrinf
 	
 	hp = gethostbyname(hostname);
 
-	if(!hp || !hp->h_addr_list[0])
+	if(!hp || !hp->h_addr_list || !hp->h_addr_list[0])
 		return EAI_NODATA;
 
 	for (i = 0; hp->h_addr_list[i]; i++) {
diff --git a/lib/fake-getnameinfo.c b/lib/fake-getnameinfo.c
index 6630decc..a0e1df33 100644
--- a/lib/fake-getnameinfo.c
+++ b/lib/fake-getnameinfo.c
@@ -20,27 +20,36 @@ int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t host
 {
 	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 */
-- 
2.20.1