Synchronise HEAD with CABAL branch.

[tinc] / lib / fake-getnameinfo.c

diff --git a/lib/fake-getnameinfo.c b/lib/fake-getnameinfo.c
new file mode 100644 (file)
index 0000000..796efdf
--- /dev/null
+++ b/lib/fake-getnameinfo.c
@@ -0,0 +1,55 @@
+/*
+ * fake library for ssh
+ *
+ * This file includes getnameinfo().
+ * These funtions are defined in rfc2133.
+ *
+ * But these functions are not implemented correctly. The minimum subset
+ * is implemented for ssh use only. For exapmle, this routine assumes
+ * that ai_family is AF_INET. Don't use it for another purpose.
+ */
+
+#include "system.h"
+
+#include "fake-getnameinfo.h"
+#include "fake-getaddrinfo.h"
+
+#ifndef HAVE_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(sa->sa_family != AF_INET)
+               return EAI_FAMILY;
+
+       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) {
+               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 || !hp->h_name[0])
+               return EAI_NODATA;
+       
+       len = snprintf(host, hostlen, "%s", hp->h_name);
+       if(len < 0 || len >= hostlen)
+               return EAI_MEMORY;
+
+       return 0;
+}
+#endif /* !HAVE_GETNAMEINFO */