[PATCH 1/2] nss: Implement --no-addrconfig option for getent

[Florian Weimer <fweimer@redhat.com>]

The ahosts, ahostsv4, ahostsv6 commands unconditionally pass
AI_ADDRCONFIG to getaddrinfo, which is not always desired.
---
 NEWS         |  5 ++++-
 nss/getent.c | 11 ++++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index ef274d1a42..d4739d93c6 100644
--- a/NEWS
+++ b/NEWS
@@ -9,7 +9,10 @@ Version 2.37
 
 Major new features:
 
-  [Add new features here]
+* The getent tool now supports the --no-addrconfig option.  When
+  present, getent no longer passes AI_ADDRCONFIG to the getaddrinfo
+  function, and the output may contain addresses of families not
+  configured on the current host.
 
 Deprecated and removed features, and other changes affecting compatibility:
 
diff --git a/nss/getent.c b/nss/getent.c
index 8178b4b470..39a42e707d 100644
--- a/nss/getent.c
+++ b/nss/getent.c
@@ -58,6 +58,8 @@ static const struct argp_option args_options[] =
   {
     { "service", 's', N_("CONFIG"), 0, N_("Service configuration to be used") },
     { "no-idn", 'i', NULL, 0, N_("disable IDN encoding") },
+    { "no-addrconfig", 'A', NULL, 0,
+      N_("disable AI_ADDRCONFIG (for ahosts*)") },
     { NULL, 0, NULL, 0, NULL },
   };
 
@@ -79,6 +81,9 @@ static struct argp argp =
 /* Additional getaddrinfo flags for IDN encoding.  */
 static int idn_flags = AI_IDN | AI_CANONIDN;
 
+/* Set to 0 by --no-addrconfig.  */
+static int addrconfig_flags = AI_ADDRCONFIG;
+
 /* Print the version information.  */
 static void
 print_version (FILE *stream, struct argp_state *state)
@@ -346,7 +351,7 @@ ahosts_keys_int (int af, int xflags, int number, char *key[])
 
   struct addrinfo hint;
   memset (&hint, '\0', sizeof (hint));
-  hint.ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG | AI_CANONNAME
+  hint.ai_flags = (AI_V4MAPPED | addrconfig_flags | AI_CANONNAME
 		   | idn_flags | xflags);
   hint.ai_family = af;
 
@@ -905,6 +910,10 @@ parse_option (int key, char *arg, struct argp_state *state)
       idn_flags = 0;
       break;
 
+    case 'A':
+      addrconfig_flags = 0;
+      break;
+
     default:
       return ARGP_ERR_UNKNOWN;
     }
-- 
2.37.2