fixes #825 TCP public API should use generic setopt/getopt

This changes much of the internal API for TCP option handling, and
includes hooks for some of this in various consumers.  Note that the
consumers still need to have additional work done to complete them,
which will be part of providing public "raw" TLS and WebSocket APIs.

We would also like to finish addressing the call sites of
nni_tcp_listener_start() that assume the sockaddr is modified --
it would be superior to use the NNG_OPT_LOCADDR option.  Thaat will be
addressed in a follow up PR.

1 files changed, 154 insertions, 5 deletions

diff --git a/src/platform/posix/posix_tcpconn.c b/src/platform/posix/posix_tcpconn.c
index 788c4e9f..a10e102f 100644
--- a/src/platform/posix/posix_tcpconn.c
+++ b/src/platform/posix/posix_tcpconn.c
@@ -1,6 +1,7 @@
 //
 // Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
+// Copyright 2018 Devolutions <info@devolutions.net>
 //
 // This software is supplied under the terms of the MIT License, a
 // copy of which should be located in the distribution where this
@@ -10,8 +11,6 @@
 
 #include "core/nng_impl.h"
 
-#ifdef NNG_PLATFORM_POSIX
-
 #include <arpa/inet.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -369,6 +368,152 @@ nni_tcp_conn_set_nodelay(nni_tcp_conn *c, bool nodelay)
 	return (0);
 }
 
+static int
+tcp_conn_get_peername(void *arg, void *buf, size_t *szp, nni_type t)
+{
+	nni_tcp_conn *          c = arg;
+	struct sockaddr_storage ss;
+	socklen_t               sslen = sizeof(ss);
+	int                     fd    = nni_posix_pfd_fd(c->pfd);
+	int                     rv;
+	nng_sockaddr            sa;
+
+	if (getpeername(fd, (void *) &ss, &sslen) != 0) {
+		return (nni_plat_errno(errno));
+	}
+	if ((rv = nni_posix_sockaddr2nn(&sa, &ss)) == 0) {
+		rv = nni_copyout_sockaddr(&sa, buf, szp, t);
+	}
+	return (rv);
+}
+
+static int
+tcp_conn_get_sockname(void *arg, void *buf, size_t *szp, nni_type t)
+{
+	nni_tcp_conn *          c = arg;
+	struct sockaddr_storage ss;
+	socklen_t               sslen = sizeof(ss);
+	int                     fd    = nni_posix_pfd_fd(c->pfd);
+	int                     rv;
+	nng_sockaddr            sa;
+
+	if (getsockname(fd, (void *) &ss, &sslen) != 0) {
+		return (nni_plat_errno(errno));
+	}
+	if ((rv = nni_posix_sockaddr2nn(&sa, &ss)) == 0) {
+		rv = nni_copyout_sockaddr(&sa, buf, szp, t);
+	}
+	return (rv);
+}
+
+static int
+tcp_conn_set_nodelay(void *arg, const void *buf, size_t sz, nni_type t)
+{
+	nni_tcp_conn *c = arg;
+	int           fd;
+	bool          b;
+	int           val;
+	int           rv;
+
+	if (((rv = nni_copyin_bool(&b, buf, sz, t)) != 0) || (c == NULL)) {
+		return (rv);
+	}
+	val = b ? 1 : 0;
+	fd  = nni_posix_pfd_fd(c->pfd);
+	if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) != 0) {
+		return (nni_plat_errno(errno));
+	}
+	return (0);
+}
+
+static int
+tcp_conn_set_keepalive(void *arg, const void *buf, size_t sz, nni_type t)
+{
+	nni_tcp_conn *c = arg;
+	int           fd;
+	bool          b;
+	int           val;
+	int           rv;
+
+	if (((rv = nni_copyin_bool(&b, buf, sz, t)) != 0) || (c == NULL)) {
+		return (rv);
+	}
+	val = b ? 1 : 0;
+	fd  = nni_posix_pfd_fd(c->pfd);
+	if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) != 0) {
+		return (nni_plat_errno(errno));
+	}
+	return (0);
+}
+
+static int
+tcp_conn_get_nodelay(void *arg, void *buf, size_t *szp, nni_type t)
+{
+	nni_tcp_conn *c     = arg;
+	int           fd    = nni_posix_pfd_fd(c->pfd);
+	int           val   = 0;
+	socklen_t     valsz = sizeof(val);
+
+	if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, &valsz) != 0) {
+		return (nni_plat_errno(errno));
+	}
+
+	return (nni_copyout_bool(val, buf, szp, t));
+}
+
+static int
+tcp_conn_get_keepalive(void *arg, void *buf, size_t *szp, nni_type t)
+{
+	nni_tcp_conn *c     = arg;
+	int           fd    = nni_posix_pfd_fd(c->pfd);
+	int           val   = 0;
+	socklen_t     valsz = sizeof(val);
+
+	if (getsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, &valsz) != 0) {
+		return (nni_plat_errno(errno));
+	}
+
+	return (nni_copyout_bool(val, buf, szp, t));
+}
+
+static const nni_option tcp_conn_options[] = {
+	{
+	    .o_name = NNG_OPT_REMADDR,
+	    .o_get  = tcp_conn_get_peername,
+	},
+	{
+	    .o_name = NNG_OPT_LOCADDR,
+	    .o_get  = tcp_conn_get_sockname,
+	},
+	{
+	    .o_name = NNG_OPT_TCP_NODELAY,
+	    .o_get  = tcp_conn_get_nodelay,
+	    .o_set  = tcp_conn_set_nodelay,
+	},
+	{
+	    .o_name = NNG_OPT_TCP_KEEPALIVE,
+	    .o_get  = tcp_conn_get_keepalive,
+	    .o_set  = tcp_conn_set_keepalive,
+	},
+	{
+	    .o_name = NULL,
+	},
+};
+
+int
+nni_tcp_conn_getopt(
+    nni_tcp_conn *c, const char *name, void *buf, size_t *szp, nni_type t)
+{
+	return (nni_getopt(tcp_conn_options, name, c, buf, szp, t));
+}
+
+int
+nni_tcp_conn_setopt(
+    nni_tcp_conn *c, const char *name, const void *buf, size_t sz, nni_type t)
+{
+	return (nni_setopt(tcp_conn_options, name, c, buf, sz, t));
+}
+
 int
 nni_posix_tcp_conn_init(nni_tcp_conn **cp, nni_posix_pfd *pfd)
 {
@@ -390,8 +535,14 @@ nni_posix_tcp_conn_init(nni_tcp_conn **cp, nni_posix_pfd *pfd)
 }
 
 void
-nni_posix_tcp_conn_start(nni_tcp_conn *c)
+nni_posix_tcp_conn_start(nni_tcp_conn *c, int nodelay, int keepalive)
 {
+	// COnfigure the initial socket options.
+	(void) setsockopt(
+	    c->pfd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(int));
+	(void) setsockopt(
+	    c->pfd, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(int));
+
 	nni_posix_pfd_set_cb(c->pfd, tcp_conn_cb, c);
 }
 
@@ -407,5 +558,3 @@ nni_tcp_conn_fini(nni_tcp_conn *c)
 
 	NNI_FREE_STRUCT(c);
 }
-
-#endif // NNG_PLATFORM_POSIX