r3162: Add client-side support for the ncalrpc: and ncacn_unix_stream: transports.

ncalrpc uses the new config option "ncalrpc dir" for creating unix sockets.
(This used to be commit b15cfbe2512961a199ecb069730d9a19787579f5)

1 files changed, 536 insertions, 0 deletions

diff --git a/source4/librpc/rpc/dcerpc_sock.c b/source4/librpc/rpc/dcerpc_sock.c
new file mode 100644
index 0000000000..9ad5c06ad2
--- /dev/null
+++ b/source4/librpc/rpc/dcerpc_sock.c
@@ -0,0 +1,536 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   dcerpc over standard sockets transport
+
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) Jelmer Vernooij 2004
+   
+   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 of the License, or
+   (at your option) any later version.
+   
+   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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#define MIN_HDR_SIZE 16
+
+struct sock_blob {
+	struct sock_blob *next, *prev;
+	DATA_BLOB data;
+};
+
+/* transport private information used by general socket pipe transports */
+struct sock_private {
+	struct event_context *event_ctx;
+	struct fd_event *fde;
+	int fd;
+	char *server_name;
+	uint32_t port;
+
+	struct sock_blob *pending_send;
+
+	struct {
+		size_t received;
+		DATA_BLOB data;
+		uint_t pending_count;
+	} recv;
+};
+
+
+/*
+  mark the socket dead
+*/
+static void sock_dead(struct dcerpc_pipe *p, NTSTATUS status)
+{
+	struct sock_private *sock = p->transport.private;
+
+	if (sock && sock->fd != -1) {
+		close(sock->fd);
+		sock->fd = -1;
+	}
+
+	/* wipe any pending sends */
+	while (sock->pending_send) {
+		struct sock_blob *blob = sock->pending_send;
+		DLIST_REMOVE(sock->pending_send, blob);
+		talloc_free(blob);
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		p->transport.recv_data(p, NULL, status);
+	}
+}
+
+/*
+  process send requests
+*/
+static void sock_process_send(struct dcerpc_pipe *p)
+{
+	struct sock_private *sock = p->transport.private;
+
+	while (sock->pending_send) {
+		struct sock_blob *blob = sock->pending_send;
+		ssize_t ret = write(sock->fd, blob->data.data, blob->data.length);
+		if (ret == -1) {
+			if (errno != EAGAIN && errno != EINTR) {
+				sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+			}
+			break;
+		}
+		if (ret == 0) {
+			sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+			break;
+		}
+
+		blob->data.data += ret;
+		blob->data.length -= ret;
+
+		if (blob->data.length != 0) {
+			break;
+		}
+
+		DLIST_REMOVE(sock->pending_send, blob);
+		talloc_free(blob);
+	}
+
+	if (sock->pending_send == NULL) {
+		sock->fde->flags &= ~EVENT_FD_WRITE;
+	}
+}
+
+
+/*
+  process recv requests
+*/
+static void sock_process_recv(struct dcerpc_pipe *p)
+{
+	struct sock_private *sock = p->transport.private;
+	ssize_t ret;
+
+	if (sock->recv.data.data == NULL) {
+		sock->recv.data = data_blob_talloc(sock, NULL, MIN_HDR_SIZE);
+	}
+
+	/* read in the base header to get the fragment length */
+	if (sock->recv.received < MIN_HDR_SIZE) {
+		uint32_t frag_length;
+
+		ret = read(sock->fd, sock->recv.data.data, 
+			   MIN_HDR_SIZE - sock->recv.received);
+		if (ret == -1) {
+			if (errno != EAGAIN && errno != EINTR) {
+				sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+			}
+			return;
+		}
+		if (ret == 0) {
+			sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+			return;
+		}
+
+		sock->recv.received += ret;
+
+		if (sock->recv.received != MIN_HDR_SIZE) {
+			return;
+		}
+		frag_length = dcerpc_get_frag_length(&sock->recv.data);
+
+		sock->recv.data.data = talloc_realloc(sock, sock->recv.data.data,
+						     frag_length);
+		if (sock->recv.data.data == NULL) {
+			sock_dead(p, NT_STATUS_NO_MEMORY);
+			return;
+		}
+		sock->recv.data.length = frag_length;
+	}
+
+	/* read in the rest of the packet */
+	ret = read(sock->fd, sock->recv.data.data + sock->recv.received,
+		   sock->recv.data.length - sock->recv.received);
+	if (ret == -1) {
+		if (errno != EAGAIN && errno != EINTR) {
+			sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+		}
+		return;
+	}
+	if (ret == 0) {
+		sock_dead(p, NT_STATUS_NET_WRITE_FAULT);
+		return;
+	}
+
+	sock->recv.received += ret;
+
+	if (sock->recv.received != sock->recv.data.length) {
+		return;
+	}
+
+	/* we have a full packet */
+	p->transport.recv_data(p, &sock->recv.data, NT_STATUS_OK);
+	talloc_free(sock->recv.data.data);
+	sock->recv.data = data_blob(NULL, 0);
+	sock->recv.received = 0;
+	sock->recv.pending_count--;
+	if (sock->recv.pending_count == 0) {
+		sock->fde->flags &= ~EVENT_FD_READ;
+	}
+}
+
+/*
+  called when a IO is triggered by the events system
+*/
+static void sock_io_handler(struct event_context *ev, struct fd_event *fde, 
+			   time_t t, uint16_t flags)
+{
+	struct dcerpc_pipe *p = fde->private;
+	struct sock_private *sock = p->transport.private;
+
+	if (flags & EVENT_FD_WRITE) {
+		sock_process_send(p);
+	}
+
+	if (sock->fd == -1) {
+		return;
+	}
+
+	if (flags & EVENT_FD_READ) {
+		sock_process_recv(p);
+	}
+}
+
+/* 
+   initiate a read request 
+*/
+static NTSTATUS sock_send_read(struct dcerpc_pipe *p)
+{
+	struct sock_private *sock = p->transport.private;
+
+	sock->recv.pending_count++;
+	if (sock->recv.pending_count == 1) {
+		sock->fde->flags |= EVENT_FD_READ;
+	}
+	return NT_STATUS_OK;
+}
+
+/* 
+   send an initial pdu in a multi-pdu sequence
+*/
+static NTSTATUS sock_send_request(struct dcerpc_pipe *p, DATA_BLOB *data, BOOL trigger_read)
+{
+	struct sock_private *sock = p->transport.private;
+	struct sock_blob *blob;
+
+	blob = talloc_p(sock, struct sock_blob);
+	if (blob == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	blob->data = data_blob_talloc(blob, data->data, data->length);
+	if (blob->data.data == NULL) {
+		talloc_free(blob);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	DLIST_ADD_END(sock->pending_send, blob, struct sock_blob *);
+
+	sock->fde->flags |= EVENT_FD_WRITE;
+
+	if (trigger_read) {
+		sock_send_read(p);
+	}
+
+	return NT_STATUS_OK;
+}
+
+/* 
+   return the event context so the caller can process asynchronously
+*/
+static struct event_context *sock_event_context(struct dcerpc_pipe *p)
+{
+	struct sock_private *sock = p->transport.private;
+
+	return sock->event_ctx;
+}
+
+/* 
+   shutdown sock pipe connection
+*/
+static NTSTATUS sock_shutdown_pipe(struct dcerpc_pipe *p)
+{
+	sock_dead(p, NT_STATUS_OK);
+
+	return NT_STATUS_OK;
+}
+
+/*
+  return sock server name
+*/
+static const char *sock_peer_name(struct dcerpc_pipe *p)
+{
+	struct sock_private *sock = p->transport.private;
+	return sock->server_name;
+}
+
+/* 
+   open a rpc connection to a named pipe 
+*/
+NTSTATUS dcerpc_pipe_open_tcp(struct dcerpc_pipe **p, 
+			      const char *server,
+			      uint32_t port, 
+				  int family)
+{
+	struct sock_private *sock;
+	int fd, gai_err;
+	struct fd_event fde;
+	struct addrinfo hints, *res, *tmpres;
+	char portname[16];
+
+	if (port == 0) {
+		port = EPMAPPER_PORT;
+	}
+
+	memset(&hints, 0, sizeof(struct addrinfo));
+
+	hints.ai_family = family;
+	hints.ai_socktype = SOCK_STREAM;
+
+	snprintf(portname, sizeof(portname)-1, "%d", port);
+	
+	gai_err = getaddrinfo(server, portname, &hints, &res);
+	if (gai_err < 0) 
+	{
+		DEBUG(0, ("Unable to connect to %s:%d : %s\n", server, port, gai_strerror(gai_err)));
+		return NT_STATUS_BAD_NETWORK_NAME;
+	}
+
+	tmpres = res;
+	
+	while (tmpres) {
+		fd = socket(tmpres->ai_family, tmpres->ai_socktype, tmpres->ai_protocol);
+
+		if(fd >= 0) {
+			if (connect(fd, tmpres->ai_addr, tmpres->ai_addrlen) == 0)	
+				break; 
+			fd = -1;
+		}
+
+		tmpres = tmpres->ai_next;
+	}
+
+	freeaddrinfo(res);
+	
+	if (fd == -1) {
+		return NT_STATUS_PORT_CONNECTION_REFUSED;
+	}
+
+	set_socket_options(fd, lp_socket_options());
+
+	if (!(*p = dcerpc_pipe_init())) {
+                return NT_STATUS_NO_MEMORY;
+	}
+ 
+	/*
+	  fill in the transport methods
+	*/
+	(*p)->transport.transport = NCACN_IP_TCP;
+	(*p)->transport.private = NULL;
+
+	(*p)->transport.send_request = sock_send_request;
+	(*p)->transport.send_read = sock_send_read;
+	(*p)->transport.event_context = sock_event_context;
+	(*p)->transport.recv_data = NULL;
+
+	(*p)->transport.shutdown_pipe = sock_shutdown_pipe;
+	(*p)->transport.peer_name = sock_peer_name;
+	
+	sock = talloc((*p), sizeof(*sock));
+	if (!sock) {
+		dcerpc_pipe_close(*p);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	sock->fd = fd;
+	sock->server_name = talloc_strdup((*p), server);
+	sock->event_ctx = event_context_init(sock);
+	sock->pending_send = NULL;
+	sock->recv.received = 0;
+	sock->recv.data = data_blob(NULL, 0);
+	sock->recv.pending_count = 0;
+
+	fde.fd = fd;
+	fde.flags = 0;
+	fde.handler = sock_io_handler;
+	fde.private = *p;
+
+	sock->fde = event_add_fd(sock->event_ctx, &fde);
+
+	(*p)->transport.private = sock;
+
+	/* ensure we don't get SIGPIPE */
+	BlockSignals(True,SIGPIPE);
+
+    return NT_STATUS_OK;
+}
+
+/* 
+   open a rpc connection to a unix socket 
+*/
+NTSTATUS dcerpc_pipe_open_unix_stream(struct dcerpc_pipe **p, 
+									  const char *path)
+{
+	struct sock_private *sock;
+	int fd;
+	struct fd_event fde;
+	struct sockaddr_un sa;
+
+	fd = socket(PF_UNIX, SOCK_STREAM, 0);
+
+	if (fd < 0) {
+		return NT_STATUS_NOT_SUPPORTED;
+	}
+	
+	sa.sun_family = AF_UNIX;
+	strncpy(sa.sun_path, path, sizeof(sa.sun_path));
+
+	if (connect(fd, &sa, sizeof(sa)) < 0) {
+		return NT_STATUS_BAD_NETWORK_NAME;
+	}
+
+	set_socket_options(fd, lp_socket_options());
+
+	if (!(*p = dcerpc_pipe_init())) {
+                return NT_STATUS_NO_MEMORY;
+	}
+ 
+	/*
+	  fill in the transport methods
+	*/
+	(*p)->transport.transport = NCACN_UNIX_STREAM;
+	(*p)->transport.private = NULL;
+
+	(*p)->transport.send_request = sock_send_request;
+	(*p)->transport.send_read = sock_send_read;
+	(*p)->transport.event_context = sock_event_context;
+	(*p)->transport.recv_data = NULL;
+
+	(*p)->transport.shutdown_pipe = sock_shutdown_pipe;
+	(*p)->transport.peer_name = sock_peer_name;
+	
+	sock = talloc((*p), sizeof(*sock));
+	if (!sock) {
+		dcerpc_pipe_close(*p);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	sock->fd = fd;
+	sock->server_name = talloc_strdup((*p), path);
+	sock->event_ctx = event_context_init(sock);
+	sock->pending_send = NULL;
+	sock->recv.received = 0;
+	sock->recv.data = data_blob(NULL, 0);
+	sock->recv.pending_count = 0;
+
+	fde.fd = fd;
+	fde.flags = 0;
+	fde.handler = sock_io_handler;
+	fde.private = *p;
+
+	sock->fde = event_add_fd(sock->event_ctx, &fde);
+
+	(*p)->transport.private = sock;
+
+	/* ensure we don't get SIGPIPE */
+	BlockSignals(True,SIGPIPE);
+
+    return NT_STATUS_OK;
+}
+
+/* 
+   open a rpc connection to a named pipe 
+*/
+NTSTATUS dcerpc_pipe_open_pipe(struct dcerpc_pipe **p, 
+									  const char *identifier)
+{
+	struct sock_private *sock;
+	int fd;
+	struct fd_event fde;
+	struct sockaddr_un sa;
+	char *canon, *full_path;
+
+	if (!(*p = dcerpc_pipe_init())) {
+                return NT_STATUS_NO_MEMORY;
+	}
+
+	canon = talloc_strdup(*p, identifier);
+
+	string_replace(canon, '/', '\\');
+
+	full_path = talloc_asprintf(*p, "%s/%s", lp_ncalrpc_dir(), canon);
+
+	fd = socket(PF_UNIX, SOCK_STREAM, 0);
+
+	if (fd < 0) {
+		return NT_STATUS_NOT_SUPPORTED;
+	}
+	
+	sa.sun_family = AF_UNIX;
+	strncpy(sa.sun_path, full_path, sizeof(sa.sun_path));
+
+	if (connect(fd, &sa, sizeof(sa)) < 0) {
+		return NT_STATUS_BAD_NETWORK_NAME;
+	}
+
+	set_socket_options(fd, lp_socket_options());
+ 
+	/*
+	  fill in the transport methods
+	*/
+	(*p)->transport.transport = NCALRPC;
+	(*p)->transport.private = NULL;
+
+	(*p)->transport.send_request = sock_send_request;
+	(*p)->transport.send_read = sock_send_read;
+	(*p)->transport.event_context = sock_event_context;
+	(*p)->transport.recv_data = NULL;
+
+	(*p)->transport.shutdown_pipe = sock_shutdown_pipe;
+	(*p)->transport.peer_name = sock_peer_name;
+	
+	sock = talloc((*p), sizeof(*sock));
+	if (!sock) {
+		dcerpc_pipe_close(*p);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	sock->fd = fd;
+	sock->server_name = full_path;
+	sock->event_ctx = event_context_init(sock);
+	sock->pending_send = NULL;
+	sock->recv.received = 0;
+	sock->recv.data = data_blob(NULL, 0);
+	sock->recv.pending_count = 0;
+
+	fde.fd = fd;
+	fde.flags = 0;
+	fde.handler = sock_io_handler;
+	fde.private = *p;
+
+	sock->fde = event_add_fd(sock->event_ctx, &fde);
+
+	(*p)->transport.private = sock;
+
+	/* ensure we don't get SIGPIPE */
+	BlockSignals(True,SIGPIPE);
+
+    return NT_STATUS_OK;
+}