sockets: pull code for testing IP availability out of specific test

The test-io-channel-socket.c file has some useful helper functions for
checking if a specific IP protocol is available. Other tests need to
perform similar kinds of checks to avoid running tests that will fail
due to missing IP protocols.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/tests/socket-helpers.c b/tests/socket-helpers.c
new file mode 100644
index 0000000..6f4bf07
--- /dev/null
+++ b/tests/socket-helpers.c
@@ -0,0 +1,100 @@
+/*
+ * Helper functions for tests using sockets
+ *
+ * Copyright 2015-2018 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/sockets.h"
+#include "socket-helpers.h"
+
+#ifndef AI_ADDRCONFIG
+# define AI_ADDRCONFIG 0
+#endif
+#ifndef EAI_ADDRFAMILY
+# define EAI_ADDRFAMILY 0
+#endif
+
+int socket_can_bind(const char *hostname)
+{
+    int fd = -1;
+    struct addrinfo ai, *res = NULL;
+    int rc;
+    int ret = -1;
+
+    memset(&ai, 0, sizeof(ai));
+    ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
+    ai.ai_family = AF_UNSPEC;
+    ai.ai_socktype = SOCK_STREAM;
+
+    /* lookup */
+    rc = getaddrinfo(hostname, NULL, &ai, &res);
+    if (rc != 0) {
+        if (rc == EAI_ADDRFAMILY ||
+            rc == EAI_FAMILY) {
+            errno = EADDRNOTAVAIL;
+        } else {
+            errno = EINVAL;
+        }
+        goto cleanup;
+    }
+
+    fd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+    if (fd < 0) {
+        goto cleanup;
+    }
+
+    if (bind(fd, res->ai_addr, res->ai_addrlen) < 0) {
+        goto cleanup;
+    }
+
+    ret = 0;
+
+ cleanup:
+    if (fd != -1) {
+        close(fd);
+    }
+    if (res) {
+        freeaddrinfo(res);
+    }
+    return ret;
+}
+
+
+int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
+{
+    *has_ipv4 = *has_ipv6 = false;
+
+    if (socket_can_bind("127.0.0.1") < 0) {
+        if (errno != EADDRNOTAVAIL) {
+            return -1;
+        }
+    } else {
+        *has_ipv4 = true;
+    }
+
+    if (socket_can_bind("::1") < 0) {
+        if (errno != EADDRNOTAVAIL) {
+            return -1;
+        }
+    } else {
+        *has_ipv6 = true;
+    }
+
+    return 0;
+}