fixes #143 Protocols and transports should be "configurable"

This makes all the protocols and transports optional.  All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.

The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).

Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.

We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added.  (Req/Rep and Surveyor are still
missing.)

1 files changed, 53 insertions, 58 deletions

diff --git a/tests/resolv.c b/tests/resolv.c
index 49d258c3..0678b05f 100644
--- a/tests/resolv.c
+++ b/tests/resolv.c
@@ -51,26 +51,6 @@ ip6tostr(void *addr)
 // too much on them, since localhost can be configured weirdly.  Notably
 // the normal assumptions on Linux do *not* hold true.
 #if 0
-
-	    Convey("Localhost IPv4 resolves", {
-		    nni_aio aio;
-		    const char *str;
-		    memset(&aio, 0, sizeof (aio));
-		    nni_aio_init(&aio, NULL, NULL);
-		    nni_plat_tcp_resolv("localhost", "80", NNG_AF_INET, 1,
-		    &aio);
-		    nni_aio_wait(&aio);
-		    So(nni_aio_result(&aio) == 0);
-		    So(aio.a_naddrs == 1);
-		    So(aio.a_addrs[0].s_un.s_in.sa_family == NNG_AF_INET);
-		    So(aio.a_addrs[0].s_un.s_in.sa_port == ntohs(80));
-		    So(aio.a_addrs[0].s_un.s_in.sa_addr == ntohl(0x7f000001));
-		    str = ip4tostr(&aio.a_addrs[0].s_un.s_in.sa_addr);
-		    So(strcmp(str, "127.0.0.1") == 0);
-		    nni_aio_fini(&aio);
-	    }
-	    );
-
 	    Convey("Localhost IPv6 resolves", {
 		    nni_aio aio;
 		    memset(&aio, 0, sizeof (aio));
@@ -87,44 +67,6 @@ ip6tostr(void *addr)
 		    So(strcmp(str, "::1") == 0);
 		    nni_aio_fini(&aio);
 	    }
-	    );
-	    Convey("Localhost UNSPEC resolves", {
-		    nni_aio aio;
-		    memset(&aio, 0, sizeof (aio));
-		    const char *str;
-		    int i;
-		    nni_aio_init(&aio, NULL, NULL);
-		    nni_plat_tcp_resolv("localhost", "80", NNG_AF_UNSPEC, 1,
-		    &aio);
-		    nni_aio_wait(&aio);
-		    So(nni_aio_result(&aio) == 0);
-		    So(aio.a_naddrs == 2);
-		    for (i = 0; i < 2; i++) {
-			    switch (aio.a_addrs[i].s_un.s_family) {
-			    case NNG_AF_INET6:
-				    So(aio.a_addrs[i].s_un.s_in6.sa_port ==
-				    ntohs(80));
-				    str =
-				    ip6tostr(&aio.a_addrs[i].s_un.s_in6.sa_addr);
-				    So(strcmp(str, "::1") == 0);
-				    break;
-
-			    case NNG_AF_INET:
-				    So(aio.a_addrs[i].s_un.s_in.sa_port ==
-				    ntohs(80));
-				    str =
-				    ip4tostr(&aio.a_addrs[i].s_un.s_in.sa_addr);
-				    So(strcmp(str, "127.0.0.1") == 0);
-				    break;
-			    default:
-				    So(1 == 0);
-			    }
-		    }
-		    So(aio.a_addrs[0].s_un.s_family !=
-		    aio.a_addrs[1].s_un.s_family);
-		    nni_aio_fini(&aio);
-	    }
-	    );
 #endif
 
 TestMain("Resolver", {
@@ -179,11 +121,18 @@ TestMain("Resolver", {
 		So(strcmp(str, "8.8.4.4") == 0);
 		nni_aio_fini(aio);
 	});
+
 	Convey("Numeric v6 resolves", {
 		nni_aio *    aio;
 		const char * str;
 		nng_sockaddr sa;
 
+		// Travis CI has moved some of their services to host that
+		// apparently don't support IPv6 at all.  This is very sad.
+		if (getenv("TRAVIS") != NULL) {
+			ConveySkip("IPv6 missing from CI provider");
+		}
+
 		nni_aio_init(&aio, NULL, NULL);
 		aio->a_addr = &sa;
 		nni_plat_tcp_resolv("::1", "80", NNG_AF_INET6, 1, aio);
@@ -230,5 +179,51 @@ TestMain("Resolver", {
 		nni_aio_fini(aio);
 	});
 
+	Convey("Localhost IPv4 resolves", {
+		nni_aio *    aio;
+		const char * str;
+		nng_sockaddr sa;
+
+		nni_aio_init(&aio, NULL, NULL);
+		aio->a_addr = &sa;
+		nni_plat_tcp_resolv("localhost", "80", NNG_AF_INET, 1, aio);
+		nni_aio_wait(aio);
+		So(nni_aio_result(aio) == 0);
+		So(sa.s_un.s_in.sa_family == NNG_AF_INET);
+		So(sa.s_un.s_in.sa_port == ntohs(80));
+		So(sa.s_un.s_in.sa_addr == ntohl(0x7f000001));
+		str = ip4tostr(&sa.s_un.s_in.sa_addr);
+		So(strcmp(str, "127.0.0.1") == 0);
+		nni_aio_fini(aio);
+	});
+
+	Convey("Localhost UNSPEC resolves", {
+		nni_aio *    aio;
+		const char * str;
+		nng_sockaddr sa;
+
+		nni_aio_init(&aio, NULL, NULL);
+		aio->a_addr = &sa;
+		nni_plat_tcp_resolv("localhost", "80", NNG_AF_UNSPEC, 1, aio);
+		nni_aio_wait(aio);
+		So(nni_aio_result(aio) == 0);
+		So((sa.s_un.s_family == NNG_AF_INET) ||
+		    (sa.s_un.s_family == NNG_AF_INET6));
+		switch (sa.s_un.s_family) {
+		case NNG_AF_INET:
+			So(sa.s_un.s_in.sa_port == ntohs(80));
+			So(sa.s_un.s_in.sa_addr == ntohl(0x7f000001));
+			str = ip4tostr(&sa.s_un.s_in.sa_addr);
+			So(strcmp(str, "127.0.0.1") == 0);
+			break;
+		case NNG_AF_INET6:
+			So(sa.s_un.s_in6.sa_port == ntohs(80));
+			str = ip6tostr(&sa.s_un.s_in6.sa_addr);
+			So(strcmp(str, "::1") == 0);
+			break;
+		}
+		nni_aio_fini(aio);
+	});
+
 	nni_fini();
 })