Initial cut at TCP, totally untested beyond compilation.

This also adds checks in the protocols to verify that pipe peers
are of the proper protocol.

2 files changed, 378 insertions, 1 deletions

diff --git a/src/platform/posix/posix_impl.h b/src/platform/posix/posix_impl.h
index 38fe27c9..2b72f574 100644
--- a/src/platform/posix/posix_impl.h
+++ b/src/platform/posix/posix_impl.h
@@ -32,8 +32,11 @@ extern int nni_plat_errno(int);
 
 #endif
 
+
 #ifdef PLATFORM_POSIX_NET
-typedef int   nni_plat_tcpsock;
+struct nni_plat_tcpsock {
+	int fd;
+};
 #endif
 
 // Define types that this platform uses.
diff --git a/src/platform/posix/posix_net.c b/src/platform/posix/posix_net.c
new file mode 100644
index 00000000..2fdab245
--- /dev/null
+++ b/src/platform/posix/posix_net.c
@@ -0,0 +1,374 @@
+//
+// Copyright 2016 Garrett D'Amore <garrett@damore.org>
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+#include "core/nng_impl.h"
+
+#ifdef PLATFORM_POSIX_NET
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <netdb.h>
+
+static int
+nni_plat_to_sockaddr(struct sockaddr_storage *ss, const nni_sockaddr *sa)
+{
+	struct sockaddr_in *sin;
+	struct sockaddr_in6 *sin6;
+
+	switch (sa->s_un.s_family) {
+	case NNG_AF_INET:
+		sin = (void *) ss;
+		memset(sin, 0, sizeof (*sin));
+		sin->sin_family = PF_INET;
+		sin->sin_port = sa->s_un.s_in.sa_port;
+		sin->sin_addr.s_addr = sa->s_un.s_in.sa_addr;
+		return (sizeof (*sin));
+
+	case NNG_AF_INET6:
+		sin6 = (void *) ss;
+		memset(&sin6, 0, sizeof (sin6));
+#ifdef  SIN6_LEN
+		sin6->sin6_len = sizeof (*sin6);
+#endif
+		sin6->sin6_family = PF_INET6;
+		sin6->sin6_port = sa->s_un.s_in6.sa_port;
+		memcpy(sin6->sin6_addr.s6_addr, sa->s_un.s_in6.sa_addr, 16);
+		return (sizeof (*sin6));
+	}
+	return (-1);
+}
+
+
+static int
+nni_plat_from_sockaddr(nni_sockaddr *sa, const struct sockaddr *ss)
+{
+	const struct sockaddr_in *sin;
+	const struct sockaddr_in6 *sin6;
+
+	memset(sa, 0, sizeof (*sa));
+	switch (ss->sa_family) {
+	case PF_INET:
+		sin = (const void *) ss;
+		sa->s_un.s_in.sa_family = NNG_AF_INET;
+		sa->s_un.s_in.sa_port = sin->sin_port;
+		sa->s_un.s_in.sa_addr = sin->sin_addr.s_addr;
+		return (0);
+
+	case PF_INET6:
+		sin6 = (const void *) ss;
+		sa->s_un.s_in6.sa_family = NNG_AF_INET6;
+		sa->s_un.s_in6.sa_port = sin6->sin6_port;
+		memcpy(sa->s_un.s_in6.sa_addr, sin6->sin6_addr.s6_addr, 16);
+		return (0);
+	}
+	return (-1);
+}
+
+
+int
+nni_plat_lookup_host(const char *host, nni_sockaddr *addr, int flags)
+{
+	struct addrinfo hint;
+	struct addrinfo *ai;
+
+	memset(&hint, 0, sizeof (hint));
+	hint.ai_flags = AI_DEFAULT | AI_PASSIVE;
+	hint.ai_family = PF_UNSPEC;
+	hint.ai_socktype = SOCK_STREAM;
+	if (flags & NNI_FLAG_IPV4ONLY) {
+		hint.ai_family = PF_INET;
+	}
+
+	if (getaddrinfo(host, NULL, &hint, &ai) != 0) {
+		return (NNG_EADDRINVAL);
+	}
+
+	if (nni_plat_from_sockaddr(addr, ai->ai_addr) < 0) {
+		freeaddrinfo(ai);
+		return (NNG_EADDRINVAL);
+	}
+	freeaddrinfo(ai);
+	return (0);
+}
+
+
+int
+nni_plat_tcp_send(nni_plat_tcpsock *s, nni_iov *iovs, int cnt)
+{
+	struct iovec iov[4];    // We never have more than 3 at present
+	int i;
+	int offset;
+	int resid = 0;
+	int rv;
+
+	if (cnt > 4) {
+		return (NNG_EINVAL);
+	}
+
+	for (i = 0; i < cnt; i++) {
+		iov[i].iov_base = iovs[i].iov_buf;
+		iov[i].iov_len = iovs[i].iov_len;
+		resid += iov[i].iov_len;
+	}
+
+	i = 0;
+	while (resid) {
+		rv = writev(s->fd, iov, cnt);
+		if (rv < 0) {
+			if (rv == EINTR) {
+				continue;
+			}
+			return (nni_plat_errno(errno));
+		}
+		if (rv > resid) {
+			nni_panic("writev says it wrote too much!");
+		}
+
+		resid -= rv;
+		while (rv) {
+			if (iov[i].iov_len <= rv) {
+				rv -= iov[i].iov_len;
+				i++;
+				cnt--;
+			} else {
+				iov[i].iov_len -= rv;
+				iov[i].iov_base += rv;
+				rv = 0;
+			}
+		}
+	}
+
+	return (0);
+}
+
+
+int
+nni_plat_tcp_recv(nni_plat_tcpsock *s, nni_iov *iovs, int cnt)
+{
+	struct iovec iov[4];    // We never have more than 3 at present
+	int i;
+	int offset;
+	int resid = 0;
+	int rv;
+
+	if (cnt > 4) {
+		return (NNG_EINVAL);
+	}
+
+	for (i = 0; i < cnt; i++) {
+		iov[i].iov_base = iovs[i].iov_buf;
+		iov[i].iov_len = iovs[i].iov_len;
+		resid += iov[i].iov_len;
+	}
+
+	i = 0;
+	while (resid) {
+		rv = readv(s->fd, iov, cnt);
+		if (rv < 0) {
+			if (errno == EINTR) {
+				continue;
+			}
+			return (nni_plat_errno(errno));
+		}
+		if (rv > resid) {
+			nni_panic("readv says it read too much!");
+		}
+
+		resid -= rv;
+		while (rv) {
+			if (iov[i].iov_len <= rv) {
+				rv -= iov[i].iov_len;
+				i++;
+				cnt--;
+			} else {
+				iov[i].iov_len -= rv;
+				iov[i].iov_base += rv;
+				rv = 0;
+			}
+		}
+	}
+
+	return (0);
+}
+
+
+static void
+nni_plat_tcp_setopts(int fd)
+{
+	int one;
+
+	// Try to ensure that both CLOEXEC is set, and that we don't
+	// generate SIGPIPE.  (Note that SIGPIPE suppression in this way
+	// only works on BSD systems.  Linux wants us to use sendmsg().)
+	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
+#if defined(F_SETNOSIGPIPE)
+	(void) fcntl(fd, F_SETNOSIGPIPE, 1);
+#elif defined(SO_NOSIGPIPE)
+	one = 1;
+	(void) setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &one, sizeof (one));
+#endif
+
+	// Also disable Nagle.  We are careful to group data with writev,
+	// and latency is king for most of our users.  (Consider adding
+	// a method to enable this later.)
+	one = 1;
+	(void) setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof (one));
+}
+
+
+void
+nni_plat_tcp_close(nni_plat_tcpsock *s)
+{
+	(void) close(s->fd);
+	s->fd = -1;
+}
+
+// nni_plat_tcp_bind creates a file descriptor bound to the given address.
+// This basically does the equivalent of socket, bind, and listen.  We have
+// chosen a default value for the listen backlog of 128, which should be
+// plenty.  (If it isn't, then the accept thread can't get enough resources
+// to keep up, and your clients are going to experience bad things.  Normally
+// the actual backlog should hover near 0 anyway.)
+int
+nni_plat_tcp_listen(nni_plat_tcpsock *s, const nni_sockaddr *addr)
+{
+	int fd;
+	int len;
+	struct sockaddr_storage ss;
+	int rv;
+
+	len = nni_plat_to_sockaddr(&ss, addr);
+	if (len < 0) {
+		return (NNG_EADDRINVAL);
+	}
+
+#ifdef SOCK_CLOEXEC
+	fd = socket(ss.ss_family, SOCK_STREAM, SOCK_CLOEXEC);
+#else
+	fd = socket(ss.ss_family, SOCK_STREAM, 0);
+#endif
+	if (fd < 0) {
+		return (nni_plat_errno(errno));
+	}
+
+	nni_plat_tcp_setopts(fd);
+
+	if (bind(fd, (struct sockaddr *) &ss, len) < 0) {
+		rv = nni_plat_errno(errno);
+		(void) close(fd);
+		return (rv);
+	}
+
+	// Listen -- 128 depth is probably sufficient.  If it isn't, other
+	// bad things are going to happen.
+	if (listen(fd, 128) != 0) {
+		rv = nni_plat_errno(errno);
+		(void) close(fd);
+		return (rv);
+	}
+
+	s->fd = fd;
+	return (0);
+}
+
+
+// nni_plat_tcp_connect establishes an outbound connection.  It the
+// bind address is not null, then it will attempt to bind to the local
+// address specified first.
+int
+nni_plat_tcp_connect(nni_plat_tcpsock *s, const nni_sockaddr *addr,
+    const nni_sockaddr *bindaddr)
+{
+	int fd;
+	int len;
+	struct sockaddr_storage ss;
+	struct sockaddr_storage bss;
+	int rv;
+
+	len = nni_plat_to_sockaddr(&ss, addr);
+	if (len < 0) {
+		return (NNG_EADDRINVAL);
+	}
+
+#ifdef  SOCK_CLOEXEC
+	fd = socket(ss.ss_family, SOCK_STREAM, SOCK_CLOEXEC);
+#else
+	fd = socket(ss.ss_family, SOCK_STREAM, 0);
+#endif
+	if (fd < 0) {
+		return (nni_plat_errno(errno));
+	}
+
+	if (bindaddr != NULL) {
+		if (bindaddr->s_un.s_family != addr->s_un.s_family) {
+			return (NNG_EINVAL);
+		}
+		if (nni_plat_to_sockaddr(&bss, bindaddr) < 0) {
+			return (NNG_EADDRINVAL);
+		}
+		if (bind(fd, (struct sockaddr *) &bss, len) < 0) {
+			rv = nni_plat_errno(errno);
+			(void) close(fd);
+			return (rv);
+		}
+	}
+
+	nni_plat_tcp_setopts(fd);
+
+	if (connect(fd, (struct sockaddr *) &ss, len) != 0) {
+		rv = nni_plat_errno(errno);
+		(void) close(fd);
+		return (rv);
+	}
+	s->fd = fd;
+	return (0);
+}
+
+
+int
+nni_plat_tcp_accept(nni_plat_tcpsock *s, nni_plat_tcpsock *server)
+{
+	int fd;
+
+	for (;;) {
+#ifdef NNG_USE_ACCEPT4
+		fd = accept4(server, NULL, NULL, SOCK_CLOEXEC);
+		if ((fd < 0) && ((errrno == ENOSYS) || (errno == ENOTSUP))) {
+			fd = accept(server, NULL, NULL);
+		}
+#else
+		fd = accept(server->fd, NULL, NULL);
+#endif
+
+		if (fd < 0) {
+			if ((errno == EINTR) || (errno == ECONNABORTED)) {
+				// These are not fatal errors, keep trying
+				continue;
+			}
+			return (nni_plat_errno(errno));
+		} else {
+			break;
+		}
+	}
+
+	nni_plat_tcp_setopts(fd);
+	s->fd = fd;
+	return (0);
+}
+
+
+#endif // PLATFORM_POSIX_NET