resolv: Deprecate legacy interfaces in libresolv

Debugging interfaces: p_*, fp_*, and sym_* could conceivably be
used to produce debug out, but these functions have not been
updated to parse more resource records, so they are not very useful
today.  Likewise for ns_sprintrr and ns_sprintrrf.  ns_format_ttl and
ns_parse_ttl are related to these.

Internal implementation details: res_isourserver is probably only
useful in the implementation of a stub resolver, and so is
res_nameinquery.

Unclear semantics and bad performance: ns_samedomain, ns_subdomain,
ns_makecanon, ns_samename do textual converions & copies instead of
checking equivalence of the wire format.

inet_neta cannot handle IPv6 addresses.

res_hostalias has been superseded by getaddrinfo with AI_CANONNAME.
hostalias is not thread-safe.

Some functions have int as size arguments instead of size_t, so they
do not follow current coding practices.  However, dn_expand and
b64_ntop are somewhat widely used (to name just two examples), so
deprecating them seems problematic.

Reviewed-by: Carlos O'Donell <carlos@systemhalted.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/inet/arpa/inet.h b/inet/arpa/inet.h
index 3a99dbfa5a..54c9c6d468 100644
--- a/inet/arpa/inet.h
+++ b/inet/arpa/inet.h
@@ -74,7 +74,8 @@ extern int inet_aton (const char *__cp, struct in_addr *__inp) __THROW;
 
 /* Format a network number NET into presentation format and place result
    in buffer starting at BUF with length of LEN bytes.  */
-extern char *inet_neta (in_addr_t __net, char *__buf, size_t __len) __THROW;
+extern char *inet_neta (in_addr_t __net, char *__buf, size_t __len) __THROW
+  __attribute_deprecated_msg__ ("Use inet_ntop instead");
 
 /* Convert network number for interface type AF in buffer starting at
    CP to presentation format.  The result will specifiy BITS bits of