getaddrinfo() may succeed with PF_UNSPEC, but fail when more specific.

(this allows to skip some tests that would fail under podman)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 tests/socket-helpers.c | 17 +++++++++++++----
 tests/socket-helpers.h | 11 -----------
 2 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/tests/socket-helpers.c b/tests/socket-helpers.c
index 8112763f5b..19a51e887e 100644
--- a/tests/socket-helpers.c
+++ b/tests/socket-helpers.c
@@ -30,7 +30,16 @@
 # define EAI_ADDRFAMILY 0
 #endif
 
-int socket_can_bind_connect(const char *hostname)
+/*
+ * @hostname: a DNS name or numeric IP address
+ *
+ * Check whether it is possible to bind & connect to ports
+ * on the DNS name or IP address @hostname. If an IP address
+ * is used, it must not be a wildcard address.
+ *
+ * Returns 0 on success, -1 on error with errno set
+ */
+static int socket_can_bind_connect(const char *hostname, int family)
 {
     int lfd = -1, cfd = -1, afd = -1;
     struct addrinfo ai, *res = NULL;
@@ -44,7 +53,7 @@ int socket_can_bind_connect(const char *hostname)
 
     memset(&ai, 0, sizeof(ai));
     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
-    ai.ai_family = AF_UNSPEC;
+    ai.ai_family = family;
     ai.ai_socktype = SOCK_STREAM;
 
     /* lookup */
@@ -129,7 +138,7 @@ int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
 {
     *has_ipv4 = *has_ipv6 = false;
 
-    if (socket_can_bind_connect("127.0.0.1") < 0) {
+    if (socket_can_bind_connect("127.0.0.1", PF_INET) < 0) {
         if (errno != EADDRNOTAVAIL) {
             return -1;
         }
@@ -137,7 +146,7 @@ int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
         *has_ipv4 = true;
     }
 
-    if (socket_can_bind_connect("::1") < 0) {
+    if (socket_can_bind_connect("::1", PF_INET6) < 0) {
         if (errno != EADDRNOTAVAIL) {
             return -1;
         }
diff --git a/tests/socket-helpers.h b/tests/socket-helpers.h
index 9de0e6b151..512a004811 100644
--- a/tests/socket-helpers.h
+++ b/tests/socket-helpers.h
@@ -20,17 +20,6 @@
 #ifndef TESTS_SOCKET_HELPERS_H
 #define TESTS_SOCKET_HELPERS_H
 
-/*
- * @hostname: a DNS name or numeric IP address
- *
- * Check whether it is possible to bind & connect to ports
- * on the DNS name or IP address @hostname. If an IP address
- * is used, it must not be a wildcard address.
- *
- * Returns 0 on success, -1 on error with errno set
- */
-int socket_can_bind_connect(const char *hostname);
-
 /*
  * @has_ipv4: set to true on return if IPv4 is available
  * @has_ipv6: set to true on return if IPv6 is available
-- 
2.22.0.428.g6d5b264208

On Sat, Jul 13, 2019 at 06:33:09PM +0400, Marc-André Lureau wrote:
> getaddrinfo() may succeed with PF_UNSPEC, but fail when more specific.
> 
> (this allows to skip some tests that would fail under podman)
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  tests/socket-helpers.c | 17 +++++++++++++----
>  tests/socket-helpers.h | 11 -----------
>  2 files changed, 13 insertions(+), 15 deletions(-)

I'm trying to think of why I would have picked AF_UNSPEC in the
first place, and can't find a reason, so

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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