[Minios-devel] [UNIKRAFT/LWIP PATCH 2/5] Add getaddrinfo() wrapper

[Costin Lupu <costin.lupu@xxxxxxxxx>]

From: Bogdan Lascu <lascu.bogdan96@xxxxxxxxx>

... and freeaddrinfo() and gai_strerror().

Signed-off-by: Bogdan Lascu <lascu.bogdan96@xxxxxxxxx>
Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 exportsyms.uk   |  3 +++
 include/netdb.h |  8 +++++++-
 inet.c          | 23 +++++++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/exportsyms.uk b/exportsyms.uk
index ca0a748..7362abb 100644
--- a/exportsyms.uk
+++ b/exportsyms.uk
@@ -35,3 +35,6 @@ getservbyname
 getservbyport
 inet_ntop
 inet_pton
+lwip_getaddrinfo
+lwip_freeaddrinfo
+gai_strerror
diff --git a/include/netdb.h b/include/netdb.h
index dbed0cd..0cbcb5e 100644
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -4,7 +4,11 @@
 
 #define gethostbyname(name) lwip_gethostbyname(name)
 #define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \
-       lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop)
+               lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop)
+
+#define freeaddrinfo(addrinfo) lwip_freeaddrinfo(addrinfo)
+#define getaddrinfo(nodname, servname, hints, res) \
+               lwip_getaddrinfo(nodname, servname, hints, res)
 
 #endif /* LWIP_DNS && LWIP_SOCKET && !(LWIP_COMPAT_SOCKETS) */
 
@@ -20,3 +24,5 @@ struct protoent {
        char    **p_aliases;    /* alias list */
        int     p_proto;        /* protocol # */
 };
+
+const char *gai_strerror(int errcode);
diff --git a/inet.c b/inet.c
index 07dafe6..f718e38 100644
--- a/inet.c
+++ b/inet.c
@@ -43,3 +43,26 @@ int inet_pton(int af, const char *src, void *dst)
 {
        return lwip_inet_pton(af, src, dst);
 }
+
+/* Note: lwip implementation of getaddrinfo does not return all the errors
+ * codes mentioned in its man page.
+ */
+const char *gai_strerror(int errcode)
+{
+       switch (errcode) {
+#if LWIP_DNS_API_DEFINE_ERRORS
+       case EAI_NONAME:
+               return "The node or service is not known; or both node and 
service are NULL.";
+       case EAI_SERVICE:
+               return "The requested service is not available for the 
requested socket type.";
+       case EAI_FAIL:
+               return "The name server returned a permanent failure 
indication.";
+       case EAI_MEMORY:
+               return "Out of memory.";
+       case EAI_FAMILY:
+               return "The requested address family is not supported.";
+#endif /* LWIP_DNS_API_DEFINE_ERRORS */
+       default:
+               return "Error on getaddrinfo.";
+       }
+}
-- 
2.20.1


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