add support for ipv6 scope_id to getaddrinfo and getnameinfo

for all address types, a scope_id specified as a decimal value is
accepted. for addresses with link-local scope, a string containing the
interface name is also accepted.

some changes are made to error handling to avoid unwanted fallbacks in
the case where the scope_id is invalid: if an earlier name lookup
backend fails with an error rather than simply "0 results", this
failure now suppresses any later attempts with other backends.

in getnameinfo, a light "itoa" type function is added for generating
decimal scope_id results, and decimal port strings for services are
also generated using this function now so as not to pull in the
dependency on snprintf.

in netdb.h, a definition for the NI_NUMERICSCOPE flag is added. this
is required by POSIX (it was previously missing) and needed to allow
callers to suppress interface-name lookups.

This commit is contained in:

Rich Felker

2014-06-04 02:24:38 -04:00

parent 8041af5988

commit bdad2fefb2

4 changed files with 57 additions and 9 deletions

									
										include/netdb.h
									
		+1
		-1
	
												View File
												
				@@ -41,7 +41,7 @@ struct addrinfo

				#define NI_NOFQDN       0x04

				#define NI_NAMEREQD     0x08

				#define NI_DGRAM        0x10

				/*#define NI_NUMERICSCOPE */

				#define NI_NUMERICSCOPE 0x100

				#define EAI_BADFLAGS   -1

				#define EAI_NONAME     -2