[libvirt] [PATCH 08/15] Introduce generic RPC client objects
Daniel P. Berrange
berrange at redhat.com
Thu Dec 16 11:22:00 UTC 2010
To facilitate creation of new clients using XDR RPC services,
pull alot of the remote driver code into a set of reusable
objects.
- virNetClient: Encapsulates a socket connection to a
remote RPC server. Handles all the network I/O for
reading/writing RPC messages. Delegates RPC encoding
and decoding to the registered programs
- virNetClientProgram: Handles processing and dispatch
of RPC messages for a single RPC (program,version).
A program can register to receive async events
from a client
Each new client program now merely needs to define the list of
RPC procedures & events it wants and their handlers. It does
not need to deal with any of the network I/O functionality at
all.
---
po/POTFILES.in | 2 +
src/Makefile.am | 13 +-
src/rpc/virnetclient.c | 1090 +++++++++++++++++++++++++++++++++++++++++
src/rpc/virnetclient.h | 75 +++
src/rpc/virnetclientprogram.c | 301 ++++++++++++
src/rpc/virnetclientprogram.h | 82 +++
6 files changed, 1562 insertions(+), 1 deletions(-)
create mode 100644 src/rpc/virnetclient.c
create mode 100644 src/rpc/virnetclient.h
create mode 100644 src/rpc/virnetclientprogram.c
create mode 100644 src/rpc/virnetclientprogram.h
diff --git a/po/POTFILES.in b/po/POTFILES.in
index bb84ea3..0595adf 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -58,6 +58,8 @@ src/qemu/qemu_monitor_json.c
src/qemu/qemu_monitor_text.c
src/qemu/qemu_security_dac.c
src/remote/remote_driver.c
+src/rpc/virnetclient.c
+src/rpc/virnetclientprogram.c
src/rpc/virnetmessage.c
src/rpc/virnetsaslcontext.c
src/rpc/virnetsocket.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 15a70d6..9fbf210 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1118,7 +1118,7 @@ libvirt_qemu_la_LIBADD = libvirt.la $(CYGWIN_EXTRA_LIBADD)
EXTRA_DIST += $(LIBVIRT_QEMU_SYMBOL_FILE)
-noinst_LTLIBRARIES += libvirt-net-rpc.la libvirt-net-rpc-server.la
+noinst_LTLIBRARIES += libvirt-net-rpc.la libvirt-net-rpc-server.la libvirt-net-rpc-client.la
libvirt_net_rpc_la_SOURCES = \
../daemon/event.c \
@@ -1154,6 +1154,17 @@ libvirt_net_rpc_server_la_LDFLAGS = \
libvirt_net_rpc_server_la_LIBADD = \
$(CYGWIN_EXTRA_LIBADD)
+libvirt_net_rpc_client_la_SOURCES = \
+ rpc/virnetclientprogram.h rpc/virnetclientprogram.c \
+ rpc/virnetclient.h rpc/virnetclient.c
+libvirt_net_rpc_client_la_CFLAGS = \
+ $(AM_CFLAGS)
+libvirt_net_rpc_client_la_LDFLAGS = \
+ $(AM_LDFLAGS) \
+ $(CYGWIN_EXTRA_LDFLAGS) \
+ $(MINGW_EXTRA_LDFLAGS)l
+libvirt_net_rpc_client_la_LIBADD = \
+ $(CYGWIN_EXTRA_LIBADD)
libexec_PROGRAMS =
diff --git a/src/rpc/virnetclient.c b/src/rpc/virnetclient.c
new file mode 100644
index 0000000..27ee685
--- /dev/null
+++ b/src/rpc/virnetclient.c
@@ -0,0 +1,1090 @@
+/*
+ * virnetclient.c: generic network RPC client
+ *
+ * Copyright (C) 2006-2010 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Daniel P. Berrange <berrange at redhat.com>
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <poll.h>
+#include <signal.h>
+
+#include "virnetclient.h"
+#include "virnetsocket.h"
+#include "memory.h"
+#include "threads.h"
+#include "files.h"
+#include "logging.h"
+#include "util.h"
+#include "virterror_internal.h"
+
+#define VIR_FROM_THIS VIR_FROM_RPC
+
+#define virNetError(code, ...) \
+ virReportErrorHelper(NULL, VIR_FROM_RPC, code, __FILE__, \
+ __FUNCTION__, __LINE__, __VA_ARGS__)
+
+typedef struct _virNetClientCall virNetClientCall;
+typedef virNetClientCall *virNetClientCallPtr;
+
+enum {
+ VIR_NET_CLIENT_MODE_WAIT_TX,
+ VIR_NET_CLIENT_MODE_WAIT_RX,
+ VIR_NET_CLIENT_MODE_COMPLETE,
+};
+
+struct _virNetClientCall {
+ int mode;
+
+ virNetMessagePtr msg;
+ int expectReply;
+
+ virCond cond;
+
+
+/* remote_error err; */
+
+ virNetClientCallPtr next;
+};
+
+
+struct _virNetClient {
+ int refs;
+
+ virMutex lock;
+
+ virNetSocketPtr sock;
+
+ virNetTLSSessionPtr tls;
+ char *hostname;
+
+ virNetClientProgramPtr *programs;
+ size_t nprograms;
+
+ /* For incoming message packets */
+ virNetMessage msg;
+
+ virNetSASLSessionPtr sasl;
+
+ /* Self-pipe to wakeup threads waiting in poll() */
+ int wakeupSendFD;
+ int wakeupReadFD;
+
+ /* List of threads currently waiting for dispatch */
+ virNetClientCallPtr waitDispatch;
+};
+
+
+static void virNetClientLock(virNetClientPtr client)
+{
+ virMutexLock(&client->lock);
+}
+
+
+static void virNetClientUnlock(virNetClientPtr client)
+{
+ virMutexUnlock(&client->lock);
+}
+
+
+static void virNetClientIncomingEvent(virNetSocketPtr sock,
+ int events,
+ void *opaque);
+
+static virNetClientPtr virNetClientNew(virNetSocketPtr sock,
+ const char *hostname)
+{
+ virNetClientPtr client;
+ int wakeupFD[2] = { -1, -1 };
+
+ if (pipe(wakeupFD) < 0) {
+ virReportSystemError(errno, "%s",
+ _("unable to make pipe"));
+ goto error;
+ }
+
+ if (VIR_ALLOC(client) < 0)
+ goto no_memory;
+
+ client->refs = 1;
+
+ if (virMutexInit(&client->lock) < 0)
+ goto error;
+
+ client->sock = sock;
+ client->wakeupReadFD = wakeupFD[0];
+ client->wakeupSendFD = wakeupFD[1];
+ wakeupFD[0] = wakeupFD[1] = -1;
+
+ if (hostname &&
+ !(client->hostname = strdup(hostname)))
+ goto no_memory;
+
+ /* Set up a callback to listen on the socket data */
+ if (virNetSocketAddIOCallback(client->sock,
+ VIR_EVENT_HANDLE_READABLE,
+ virNetClientIncomingEvent,
+ client) < 0)
+ VIR_DEBUG0("Failed to add event watch, disabling events");
+
+ return client;
+
+no_memory:
+ virReportOOMError();
+error:
+ VIR_FORCE_CLOSE(wakeupFD[0]);
+ VIR_FORCE_CLOSE(wakeupFD[1]);
+ virNetClientFree(client);
+ return NULL;
+}
+
+
+virNetClientPtr virNetClientNewUNIX(const char *path,
+ bool spawnDaemon,
+ const char *binary)
+{
+ virNetSocketPtr sock;
+
+ if (virNetSocketNewConnectUNIX(path, spawnDaemon, binary, &sock) < 0)
+ return NULL;
+
+ return virNetClientNew(sock, NULL);
+}
+
+
+virNetClientPtr virNetClientNewTCP(const char *nodename,
+ const char *service)
+{
+ virNetSocketPtr sock;
+
+ if (virNetSocketNewConnectTCP(nodename, service, &sock) < 0)
+ return NULL;
+
+ return virNetClientNew(sock, nodename);
+}
+
+virNetClientPtr virNetClientNewSSH(const char *nodename,
+ const char *service,
+ const char *binary,
+ const char *username,
+ bool noTTY,
+ const char *netcat,
+ const char *path)
+{
+ virNetSocketPtr sock;
+
+ if (virNetSocketNewConnectSSH(nodename, service, binary, username, noTTY, netcat, path, &sock) < 0)
+ return NULL;
+
+ return virNetClientNew(sock, NULL);
+}
+
+virNetClientPtr virNetClientNewExternal(const char **cmdargv)
+{
+ virNetSocketPtr sock;
+
+ if (virNetSocketNewConnectExternal(cmdargv, &sock) < 0)
+ return NULL;
+
+ return virNetClientNew(sock, NULL);
+}
+
+
+void virNetClientRef(virNetClientPtr client)
+{
+ virNetClientLock(client);
+ client->refs++;
+ virNetClientUnlock(client);
+}
+
+
+void virNetClientFree(virNetClientPtr client)
+{
+ int i;
+
+ if (!client)
+ return;
+
+ virNetClientLock(client);
+ client->refs--;
+ if (client->refs > 0) {
+ virNetClientUnlock(client);
+ return;
+ }
+
+ for (i = 0 ; i < client->nprograms ; i++)
+ virNetClientProgramFree(client->programs[i]);
+ VIR_FREE(client->programs);
+
+ VIR_FORCE_CLOSE(client->wakeupSendFD);
+ VIR_FORCE_CLOSE(client->wakeupReadFD);
+
+ VIR_FREE(client->hostname);
+
+ virNetSocketRemoveIOCallback(client->sock);
+ virNetSocketFree(client->sock);
+ virNetTLSSessionFree(client->tls);
+ virNetSASLSessionFree(client->sasl);
+ virNetClientUnlock(client);
+ virMutexDestroy(&client->lock);
+
+ VIR_FREE(client);
+}
+
+
+void virNetClientSetSASLSession(virNetClientPtr client,
+ virNetSASLSessionPtr sasl)
+{
+ virNetClientLock(client);
+ client->sasl = sasl;
+ virNetSASLSessionRef(sasl);
+ virNetSocketSetSASLSession(client->sock, client->sasl);
+ virNetClientUnlock(client);
+}
+
+
+int virNetClientSetTLSSession(virNetClientPtr client,
+ virNetTLSContextPtr tls)
+{
+ int ret;
+ char buf[1];
+ int len;
+ struct pollfd fds[1];
+#ifdef HAVE_PTHREAD_SIGMASK
+ sigset_t oldmask, blockedsigs;
+
+ sigemptyset (&blockedsigs);
+ sigaddset (&blockedsigs, SIGWINCH);
+ sigaddset (&blockedsigs, SIGCHLD);
+ sigaddset (&blockedsigs, SIGPIPE);
+#endif
+
+ virNetClientLock(client);
+
+ if (!(client->tls = virNetTLSSessionNew(tls,
+ client->hostname)))
+ goto error;
+
+ virNetSocketSetTLSSession(client->sock, client->tls);
+
+ for (;;) {
+ ret = virNetTLSSessionHandshake(client->tls);
+
+ if (ret < 0)
+ goto error;
+ if (ret == 0)
+ break;
+
+ fds[0].fd = virNetSocketGetFD(client->sock);
+ fds[0].revents = 0;
+ if (virNetTLSSessionGetHandshakeStatus(client->tls) ==
+ VIR_NET_TLS_HANDSHAKE_RECVING)
+ fds[0].events = POLLIN;
+ else
+ fds[0].events = POLLOUT;
+
+ /* Block SIGWINCH from interrupting poll in curses programs,
+ * then restore the original signal mask again immediately
+ * after the call (RHBZ#567931). Same for SIGCHLD and SIGPIPE
+ * at the suggestion of Paolo Bonzini and Daniel Berrange.
+ */
+#ifdef HAVE_PTHREAD_SIGMASK
+ ignore_value(pthread_sigmask(SIG_BLOCK, &blockedsigs, &oldmask));
+#endif
+
+ repoll:
+ ret = poll(fds, ARRAY_CARDINALITY(fds), -1);
+ if (ret < 0 && errno == EAGAIN)
+ goto repoll;
+
+#ifdef HAVE_PTHREAD_SIGMASK
+ ignore_value(pthread_sigmask(SIG_BLOCK, &oldmask, NULL));
+#endif
+ }
+
+ ret = virNetTLSContextCheckCertificate(tls, client->tls);
+
+ if (ret < 0)
+ goto error;
+
+ /* At this point, the server is verifying _our_ certificate, IP address,
+ * etc. If we make the grade, it will send us a '\1' byte.
+ */
+
+ fds[0].fd = virNetSocketGetFD(client->sock);
+ fds[0].revents = 0;
+ fds[0].events = POLLIN;
+
+#ifdef HAVE_PTHREAD_SIGMASK
+ /* Block SIGWINCH from interrupting poll in curses programs */
+ ignore_value(pthread_sigmask(SIG_BLOCK, &blockedsigs, &oldmask));
+#endif
+
+ repoll2:
+ ret = poll(fds, ARRAY_CARDINALITY(fds), -1);
+ if (ret < 0 && errno == EAGAIN)
+ goto repoll2;
+
+#ifdef HAVE_PTHREAD_SIGMASK
+ ignore_value(pthread_sigmask(SIG_BLOCK, &oldmask, NULL));
+#endif
+
+ len = virNetTLSSessionRead(client->tls, buf, 1);
+ if (len < 0) {
+ virReportSystemError(errno, "%s",
+ _("Unable to read TLS confirmation"));
+ goto error;
+ }
+ if (len != 1 || buf[0] != '\1') {
+ virNetError(VIR_ERR_RPC, "%s",
+ _("server verification (of our certificate or IP "
+ "address) failed"));
+ goto error;
+ }
+
+ virNetClientUnlock(client);
+ return 0;
+
+error:
+ virNetTLSSessionFree(client->tls);
+ client->tls = NULL;
+ virNetClientUnlock(client);
+ return -1;
+}
+
+bool virNetClientIsEncrypted(virNetClientPtr client)
+{
+ bool ret;
+ virNetClientLock(client);
+ ret = client->tls || client->sasl ? true : false;
+ virNetClientUnlock(client);
+ return ret;
+}
+
+
+int virNetClientAddProgram(virNetClientPtr client,
+ virNetClientProgramPtr prog)
+{
+ virNetClientLock(client);
+
+ if (VIR_EXPAND_N(client->programs, client->nprograms, 1) < 0)
+ goto no_memory;
+
+ client->programs[client->nprograms-1] = prog;
+ virNetClientProgramRef(prog);
+
+ virNetClientUnlock(client);
+ return 0;
+
+no_memory:
+ virReportOOMError();
+ virNetClientUnlock(client);
+ return -1;
+}
+
+
+const char *virNetClientLocalAddrString(virNetClientPtr client)
+{
+ return virNetSocketLocalAddrString(client->sock);
+}
+
+const char *virNetClientRemoteAddrString(virNetClientPtr client)
+{
+ return virNetSocketRemoteAddrString(client->sock);
+}
+
+int virNetClientGetTLSKeySize(virNetClientPtr client)
+{
+ int ret = 0;
+ virNetClientLock(client);
+ if (client->tls)
+ ret = virNetTLSSessionGetKeySize(client->tls);
+ virNetClientUnlock(client);
+ return ret;
+}
+
+static int
+virNetClientCallDispatchReply(virNetClientPtr client)
+{
+ virNetClientCallPtr thecall;
+
+ /* Ok, definitely got an RPC reply now find
+ out who's been waiting for it */
+ thecall = client->waitDispatch;
+ while (thecall &&
+ !(thecall->msg->header.prog == client->msg.header.prog &&
+ thecall->msg->header.vers == client->msg.header.vers &&
+ thecall->msg->header.serial == client->msg.header.serial))
+ thecall = thecall->next;
+
+ if (!thecall) {
+ virNetError(VIR_ERR_RPC,
+ _("no call waiting for reply with prog %d vers %d serial %d"),
+ client->msg.header.prog, client->msg.header.vers, client->msg.header.serial);
+ return -1;
+ }
+
+ memcpy(thecall->msg->buffer, client->msg.buffer, sizeof(client->msg.buffer));
+ memcpy(&thecall->msg->header, &client->msg.header, sizeof(client->msg.header));
+ thecall->msg->bufferLength = client->msg.bufferLength;
+ thecall->msg->bufferOffset = client->msg.bufferOffset;
+
+ thecall->mode = VIR_NET_CLIENT_MODE_COMPLETE;
+
+ return 0;
+}
+
+static int virNetClientCallDispatchMessage(virNetClientPtr client)
+{
+ int i;
+ virNetClientProgramPtr prog = NULL;
+
+ for (i = 0 ; i < client->nprograms ; i++) {
+ if (virNetClientProgramMatches(client->programs[i],
+ &client->msg)) {
+ prog = client->programs[i];
+ break;
+ }
+ }
+ if (!prog) {
+ VIR_DEBUG("No program found for event with prog=%d vers=%d",
+ client->msg.header.prog, client->msg.header.vers);
+ return -1;
+ }
+
+ virNetClientProgramDispatch(prog, client, &client->msg);
+
+ return 0;
+}
+
+static int virNetClientCallDispatchStream(virNetClientPtr client ATTRIBUTE_UNUSED)
+{
+#if 0
+ struct private_stream_data *privst;
+ virNetClientCallPtr thecall;
+
+ /* Try and find a matching stream */
+ privst = client->streams;
+ while (privst &&
+ privst->serial != hdr->serial &&
+ privst->proc_nr != hdr->proc)
+ privst = privst->next;
+
+ if (!privst) {
+ VIR_DEBUG("No registered stream matching serial=%d, proc=%d",
+ hdr->serial, hdr->proc);
+ return -1;
+ }
+
+ /* See if there's also a (optional) call waiting for this reply */
+ thecall = client->waitDispatch;
+ while (thecall &&
+ thecall->serial != hdr->serial)
+ thecall = thecall->next;
+
+
+ /* Status is either REMOTE_OK (meaning that what follows is a ret
+ * structure), or REMOTE_ERROR (and what follows is a remote_error
+ * structure).
+ */
+ switch (hdr->status) {
+ case REMOTE_CONTINUE: {
+ int avail = privst->incomingLength - privst->incomingOffset;
+ int need = client->bufferLength - client->bufferOffset;
+ VIR_DEBUG0("Got a stream data packet");
+
+ /* XXX flag stream as complete somwhere if need==0 */
+
+ if (need > avail) {
+ int extra = need - avail;
+ if (VIR_REALLOC_N(privst->incoming,
+ privst->incomingLength + extra) < 0) {
+ VIR_DEBUG0("Out of memory handling stream data");
+ return -1;
+ }
+ privst->incomingLength += extra;
+ }
+
+ memcpy(privst->incoming + privst->incomingOffset,
+ client->buffer + client->bufferOffset,
+ client->bufferLength - client->bufferOffset);
+ privst->incomingOffset += (client->bufferLength - client->bufferOffset);
+
+ if (thecall && thecall->want_reply) {
+ VIR_DEBUG("Got sync data packet offset=%d", privst->incomingOffset);
+ thecall->mode = REMOTE_MODE_COMPLETE;
+ } else {
+ VIR_DEBUG("Got aysnc data packet offset=%d", privst->incomingOffset);
+ remoteStreamEventTimerUpdate(privst);
+ }
+ return 0;
+ }
+
+ case REMOTE_OK:
+ VIR_DEBUG0("Got a synchronous confirm");
+ if (!thecall) {
+ VIR_DEBUG0("Got unexpected stream finish confirmation");
+ return -1;
+ }
+ thecall->mode = REMOTE_MODE_COMPLETE;
+ return 0;
+
+ case REMOTE_ERROR:
+ if (thecall && thecall->want_reply) {
+ VIR_DEBUG0("Got a synchronous error");
+ /* Give the error straight to this call */
+ memset (&thecall->err, 0, sizeof thecall->err);
+ if (!xdr_remote_error (xdr, &thecall->err)) {
+ remoteError(VIR_ERR_RPC, "%s", _("unmarshalling remote_error"));
+ return -1;
+ }
+ thecall->mode = REMOTE_MODE_ERROR;
+ } else {
+ VIR_DEBUG0("Got a asynchronous error");
+ /* No call, so queue the error against the stream */
+ if (privst->has_error) {
+ VIR_DEBUG0("Got unexpected duplicate stream error");
+ return -1;
+ }
+ privst->has_error = 1;
+ memset (&privst->err, 0, sizeof privst->err);
+ if (!xdr_remote_error (xdr, &privst->err)) {
+ VIR_DEBUG0("Failed to unmarshall error");
+ return -1;
+ }
+ }
+ return 0;
+
+ default:
+ VIR_WARN("Stream with unexpected serial=%d, proc=%d, status=%d",
+ hdr->serial, hdr->proc, hdr->status);
+ return -1;
+ }
+#endif
+ return 0;
+}
+
+
+static int
+virNetClientCallDispatch(virNetClientPtr client)
+{
+ if (virNetMessageDecodeHeader(&client->msg) < 0)
+ return -1;
+
+ switch (client->msg.header.type) {
+ case VIR_NET_REPLY: /* Normal RPC replies */
+ return virNetClientCallDispatchReply(client);
+
+ case VIR_NET_MESSAGE: /* Async notifications */
+ return virNetClientCallDispatchMessage(client);
+
+ case VIR_NET_STREAM: /* Stream protocol */
+ return virNetClientCallDispatchStream(client);
+
+ default:
+ virNetError(VIR_ERR_RPC,
+ _("got unexpected RPC call prog %d vers %d proc %d type %d"),
+ client->msg.header.prog, client->msg.header.vers,
+ client->msg.header.proc, client->msg.header.type);
+ return -1;
+ }
+}
+
+
+static ssize_t
+virNetClientIOWriteMessage(virNetClientPtr client,
+ virNetClientCallPtr thecall)
+{
+ ssize_t ret;
+
+ ret = virNetSocketWrite(client->sock,
+ thecall->msg->buffer + thecall->msg->bufferOffset,
+ thecall->msg->bufferLength - thecall->msg->bufferOffset);
+ if (ret <= 0)
+ return ret;
+
+ thecall->msg->bufferOffset += ret;
+
+ if (thecall->msg->bufferOffset == thecall->msg->bufferLength) {
+ thecall->msg->bufferOffset = thecall->msg->bufferLength = 0;
+ if (thecall->expectReply)
+ thecall->mode = VIR_NET_CLIENT_MODE_WAIT_RX;
+ else
+ thecall->mode = VIR_NET_CLIENT_MODE_COMPLETE;
+ }
+
+ return ret;
+}
+
+
+static ssize_t
+virNetClientIOHandleOutput(virNetClientPtr client)
+{
+ virNetClientCallPtr thecall = client->waitDispatch;
+
+ while (thecall &&
+ thecall->mode != VIR_NET_CLIENT_MODE_WAIT_TX)
+ thecall = thecall->next;
+
+ if (!thecall)
+ return -1; /* Shouldn't happen, but you never know... */
+
+ while (thecall) {
+ ssize_t ret = virNetClientIOWriteMessage(client, thecall);
+ if (ret < 0)
+ return ret;
+
+ if (thecall->mode == VIR_NET_CLIENT_MODE_WAIT_TX)
+ return 0; /* Blocking write, to back to event loop */
+
+ thecall = thecall->next;
+ }
+
+ return 0; /* No more calls to send, all done */
+}
+
+static ssize_t
+virNetClientIOReadMessage(virNetClientPtr client)
+{
+ size_t wantData;
+ ssize_t ret;
+
+ /* Start by reading length word */
+ if (client->msg.bufferLength == 0)
+ client->msg.bufferLength = 4;
+
+ wantData = client->msg.bufferLength - client->msg.bufferOffset;
+
+ ret = virNetSocketRead(client->sock,
+ client->msg.buffer + client->msg.bufferOffset,
+ wantData);
+ if (ret <= 0)
+ return ret;
+
+ client->msg.bufferOffset += ret;
+
+ return ret;
+}
+
+
+static ssize_t
+virNetClientIOHandleInput(virNetClientPtr client)
+{
+ /* Read as much data as is available, until we get
+ * EAGAIN
+ */
+ for (;;) {
+ ssize_t ret = virNetClientIOReadMessage(client);
+
+ if (ret < 0)
+ return -1;
+ if (ret == 0)
+ return 0; /* Blocking on read */
+
+ /* Check for completion of our goal */
+ if (client->msg.bufferOffset == client->msg.bufferLength) {
+ if (client->msg.bufferOffset == 4) {
+ ret = virNetMessageDecodeLength(&client->msg);
+ if (ret < 0)
+ return -1;
+
+ /*
+ * We'll carry on around the loop to immediately
+ * process the message body, because it has probably
+ * already arrived. Worst case, we'll get EAGAIN on
+ * next iteration.
+ */
+ } else {
+ ret = virNetClientCallDispatch(client);
+ client->msg.bufferOffset = client->msg.bufferLength = 0;
+ /*
+ * We've completed one call, so return even
+ * though there might still be more data on
+ * the wire. We need to actually let the caller
+ * deal with this arrived message to keep good
+ * response, and also to correctly handle EOF.
+ */
+ return ret;
+ }
+ }
+ }
+}
+
+
+/*
+ * Process all calls pending dispatch/receive until we
+ * get a reply to our own call. Then quit and pass the buck
+ * to someone else.
+ */
+static int virNetClientIOEventLoop(virNetClientPtr client,
+ virNetClientCallPtr thiscall)
+{
+ struct pollfd fds[2];
+ int ret;
+
+ fds[0].fd = virNetSocketGetFD(client->sock);
+ fds[1].fd = client->wakeupReadFD;
+
+ for (;;) {
+ virNetClientCallPtr tmp = client->waitDispatch;
+ virNetClientCallPtr prev;
+ char ignore;
+#ifdef HAVE_PTHREAD_SIGMASK
+ sigset_t oldmask, blockedsigs;
+#endif
+
+ fds[0].events = fds[0].revents = 0;
+ fds[1].events = fds[1].revents = 0;
+
+ fds[1].events = POLLIN;
+ while (tmp) {
+ if (tmp->mode == VIR_NET_CLIENT_MODE_WAIT_RX)
+ fds[0].events |= POLLIN;
+ if (tmp->mode == VIR_NET_CLIENT_MODE_WAIT_TX)
+ fds[0].events |= POLLOUT;
+
+ tmp = tmp->next;
+ }
+
+#if 0
+ XXX
+ if (client->streams)
+ fds[0].events |= POLLIN;
+#endif
+
+ /* Release lock while poll'ing so other threads
+ * can stuff themselves on the queue */
+ virNetClientUnlock(client);
+
+ /* Block SIGWINCH from interrupting poll in curses programs,
+ * then restore the original signal mask again immediately
+ * after the call (RHBZ#567931). Same for SIGCHLD and SIGPIPE
+ * at the suggestion of Paolo Bonzini and Daniel Berrange.
+ */
+#ifdef HAVE_PTHREAD_SIGMASK
+ sigemptyset (&blockedsigs);
+ sigaddset (&blockedsigs, SIGWINCH);
+ sigaddset (&blockedsigs, SIGCHLD);
+ sigaddset (&blockedsigs, SIGPIPE);
+ ignore_value(pthread_sigmask(SIG_BLOCK, &blockedsigs, &oldmask));
+#endif
+
+ repoll:
+ ret = poll(fds, ARRAY_CARDINALITY(fds), -1);
+ if (ret < 0 && errno == EAGAIN)
+ goto repoll;
+
+#ifdef HAVE_PTHREAD_SIGMASK
+ ignore_value(pthread_sigmask(SIG_SETMASK, &oldmask, NULL));
+#endif
+
+ virNetClientLock(client);
+
+ if (fds[1].revents) {
+ VIR_DEBUG0("Woken up from poll by other thread");
+ if (saferead(client->wakeupReadFD, &ignore, sizeof(ignore)) != sizeof(ignore)) {
+ virReportSystemError(errno, "%s",
+ _("read on wakeup fd failed"));
+ goto error;
+ }
+ }
+
+ if (ret < 0) {
+ if (errno == EWOULDBLOCK)
+ continue;
+ virReportSystemError(errno,
+ "%s", _("poll on socket failed"));
+ goto error;
+ }
+
+ if (fds[0].revents & POLLOUT) {
+ if (virNetClientIOHandleOutput(client) < 0)
+ goto error;
+ }
+
+ if (fds[0].revents & POLLIN) {
+ if (virNetClientIOHandleInput(client) < 0)
+ goto error;
+ }
+
+ /* Iterate through waiting threads and if
+ * any are complete then tell 'em to wakeup
+ */
+ tmp = client->waitDispatch;
+ prev = NULL;
+ while (tmp) {
+ if (tmp != thiscall &&
+ tmp->mode == VIR_NET_CLIENT_MODE_COMPLETE) {
+ /* Take them out of the list */
+ if (prev)
+ prev->next = tmp->next;
+ else
+ client->waitDispatch = tmp->next;
+
+ /* And wake them up....
+ * ...they won't actually wakeup until
+ * we release our mutex a short while
+ * later...
+ */
+ VIR_DEBUG("Waking up sleep %p %p", tmp, client->waitDispatch);
+ virCondSignal(&tmp->cond);
+ }
+ prev = tmp;
+ tmp = tmp->next;
+ }
+
+ /* Now see if *we* are done */
+ if (thiscall->mode == VIR_NET_CLIENT_MODE_COMPLETE) {
+ /* We're at head of the list already, so
+ * remove us
+ */
+ client->waitDispatch = thiscall->next;
+ VIR_DEBUG("Giving up the buck %p %p", thiscall, client->waitDispatch);
+ /* See if someone else is still waiting
+ * and if so, then pass the buck ! */
+ if (client->waitDispatch) {
+ VIR_DEBUG("Passing the buck to %p", client->waitDispatch);
+ virCondSignal(&client->waitDispatch->cond);
+ }
+ return 0;
+ }
+
+
+ if (fds[0].revents & (POLLHUP | POLLERR)) {
+ virNetError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("received hangup / error event on socket"));
+ goto error;
+ }
+ }
+
+
+error:
+ client->waitDispatch = thiscall->next;
+ VIR_DEBUG("Giving up the buck due to I/O error %p %p", thiscall, client->waitDispatch);
+ /* See if someone else is still waiting
+ * and if so, then pass the buck ! */
+ if (client->waitDispatch) {
+ VIR_DEBUG("Passing the buck to %p", client->waitDispatch);
+ virCondSignal(&client->waitDispatch->cond);
+ }
+ return -1;
+}
+
+
+/*
+ * This function sends a message to remote server and awaits a reply
+ *
+ * NB. This does not free the args structure (not desirable, since you
+ * often want this allocated on the stack or else it contains strings
+ * which come from the user). It does however free any intermediate
+ * results, eg. the error structure if there is one.
+ *
+ * NB(2). Make sure to memset (&ret, 0, sizeof ret) before calling,
+ * else Bad Things will happen in the XDR code.
+ *
+ * NB(3) You must have the client lock before calling this
+ *
+ * NB(4) This is very complicated. Multiple threads are allowed to
+ * use the client for RPC at the same time. Obviously only one of
+ * them can. So if someone's using the socket, other threads are put
+ * to sleep on condition variables. The existing thread may completely
+ * send & receive their RPC call/reply while they're asleep. Or it
+ * may only get around to dealing with sending the call. Or it may
+ * get around to neither. So upon waking up from slumber, the other
+ * thread may or may not have more work todo.
+ *
+ * We call this dance 'passing the buck'
+ *
+ * http://en.wikipedia.org/wiki/Passing_the_buck
+ *
+ * "Buck passing or passing the buck is the action of transferring
+ * responsibility or blame unto another person. It is also used as
+ * a strategy in power politics when the actions of one country/
+ * nation are blamed on another, providing an opportunity for war."
+ *
+ * NB(5) Don't Panic!
+ */
+static int virNetClientIO(virNetClientPtr client,
+ virNetClientCallPtr thiscall)
+{
+ int rv = -1;
+
+ VIR_DEBUG("program=%u version=%u serial=%u proc=%d type=%d length=%zu dispatch=%p",
+ thiscall->msg->header.prog,
+ thiscall->msg->header.vers,
+ thiscall->msg->header.serial,
+ thiscall->msg->header.proc,
+ thiscall->msg->header.type,
+ thiscall->msg->bufferLength,
+ client->waitDispatch);
+
+ /* Check to see if another thread is dispatching */
+ if (client->waitDispatch) {
+ /* Stick ourselves on the end of the wait queue */
+ virNetClientCallPtr tmp = client->waitDispatch;
+ char ignore = 1;
+ while (tmp && tmp->next)
+ tmp = tmp->next;
+ if (tmp)
+ tmp->next = thiscall;
+ else
+ client->waitDispatch = thiscall;
+
+ /* Force other thread to wakeup from poll */
+ if (safewrite(client->wakeupSendFD, &ignore, sizeof(ignore)) != sizeof(ignore)) {
+ if (tmp)
+ tmp->next = NULL;
+ else
+ client->waitDispatch = NULL;
+ virReportSystemError(errno, "%s",
+ _("failed to wake up polling thread"));
+ return -1;
+ }
+
+ VIR_DEBUG("Going to sleep %p %p", client->waitDispatch, thiscall);
+ /* Go to sleep while other thread is working... */
+ if (virCondWait(&thiscall->cond, &client->lock) < 0) {
+ if (client->waitDispatch == thiscall) {
+ client->waitDispatch = thiscall->next;
+ } else {
+ tmp = client->waitDispatch;
+ while (tmp && tmp->next &&
+ tmp->next != thiscall) {
+ tmp = tmp->next;
+ }
+ if (tmp && tmp->next == thiscall)
+ tmp->next = thiscall->next;
+ }
+ virNetError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("failed to wait on condition"));
+ return -1;
+ }
+
+ VIR_DEBUG("Wokeup from sleep %p %p", client->waitDispatch, thiscall);
+ /* Two reasons we can be woken up
+ * 1. Other thread has got our reply ready for us
+ * 2. Other thread is all done, and it is our turn to
+ * be the dispatcher to finish waiting for
+ * our reply
+ */
+ if (thiscall->mode == VIR_NET_CLIENT_MODE_COMPLETE) {
+ rv = 0;
+ /*
+ * We avoided catching the buck and our reply is ready !
+ * We've already had 'thiscall' removed from the list
+ * so just need to (maybe) handle errors & free it
+ */
+ goto cleanup;
+ }
+
+ /* Grr, someone passed the buck onto us ... */
+
+ } else {
+ /* We're first to catch the buck */
+ client->waitDispatch = thiscall;
+ }
+
+ VIR_DEBUG("We have the buck %p %p", client->waitDispatch, thiscall);
+ /*
+ * The buck stops here!
+ *
+ * At this point we're about to own the dispatch
+ * process...
+ */
+
+ /*
+ * Avoid needless wake-ups of the event loop in the
+ * case where this call is being made from a different
+ * thread than the event loop. These wake-ups would
+ * cause the event loop thread to be blocked on the
+ * mutex for the duration of the call
+ */
+ virNetSocketUpdateIOCallback(client->sock, 0);
+
+ rv = virNetClientIOEventLoop(client, thiscall);
+
+ virNetSocketUpdateIOCallback(client->sock, VIR_EVENT_HANDLE_READABLE);
+
+cleanup:
+ VIR_DEBUG("All done with our call %p %p %d", client->waitDispatch, thiscall, rv);
+ return rv;
+}
+
+
+void virNetClientIncomingEvent(virNetSocketPtr sock,
+ int events,
+ void *opaque)
+{
+ virNetClientPtr client = opaque;
+
+ virNetClientLock(client);
+
+ /* This should be impossible, but it doesn't hurt to check */
+ if (client->waitDispatch)
+ goto done;
+
+ VIR_DEBUG("Event fired %p %d", sock, events);
+
+ if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR)) {
+ VIR_DEBUG("%s : VIR_EVENT_HANDLE_HANGUP or "
+ "VIR_EVENT_HANDLE_ERROR encountered", __FUNCTION__);
+ virNetSocketRemoveIOCallback(sock);
+ goto done;
+ }
+
+ if (virNetClientIOHandleInput(client) < 0)
+ VIR_DEBUG0("Something went wrong during async message processing");
+
+done:
+ virNetClientUnlock(client);
+}
+
+
+int virNetClientSend(virNetClientPtr client,
+ virNetMessagePtr msg,
+ bool expectReply)
+{
+ virNetClientCallPtr call;
+ int ret = -1;
+
+ if (VIR_ALLOC(call) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ virNetClientLock(client);
+
+ if (virCondInit(&call->cond) < 0) {
+ virNetError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("cannot initialize condition variable"));
+ goto cleanup;
+ }
+
+ call->mode = VIR_NET_CLIENT_MODE_WAIT_TX;
+ call->msg = msg;
+ call->expectReply = expectReply;
+
+ ret = virNetClientIO(client, call);
+
+cleanup:
+ VIR_FREE(call);
+ virNetClientUnlock(client);
+ return ret;
+}
diff --git a/src/rpc/virnetclient.h b/src/rpc/virnetclient.h
new file mode 100644
index 0000000..600b00a
--- /dev/null
+++ b/src/rpc/virnetclient.h
@@ -0,0 +1,75 @@
+/*
+ * virnetclient.h: generic network RPC client
+ *
+ * Copyright (C) 2006-2010 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Daniel P. Berrange <berrange at redhat.com>
+ */
+
+#ifndef __VIR_NET_CLIENT_H__
+# define __VIR_NET_CLIENT_H__
+
+# include <stdbool.h>
+
+# include "virnettlscontext.h"
+# include "virnetmessage.h"
+# include "virnetsaslcontext.h"
+# include "virnetclientprogram.h"
+
+
+virNetClientPtr virNetClientNewUNIX(const char *path,
+ bool spawnDaemon,
+ const char *daemon);
+
+virNetClientPtr virNetClientNewTCP(const char *nodename,
+ const char *service);
+
+virNetClientPtr virNetClientNewSSH(const char *nodename,
+ const char *service,
+ const char *binary,
+ const char *username,
+ bool noTTY,
+ const char *netcat,
+ const char *path);
+
+virNetClientPtr virNetClientNewExternal(const char **cmdargv);
+
+void virNetClientRef(virNetClientPtr client);
+
+int virNetClientAddProgram(virNetClientPtr client,
+ virNetClientProgramPtr prog);
+
+int virNetClientSend(virNetClientPtr client,
+ virNetMessagePtr msg,
+ bool expectReply);
+
+void virNetClientSetSASLSession(virNetClientPtr client,
+ virNetSASLSessionPtr sasl);
+
+int virNetClientSetTLSSession(virNetClientPtr client,
+ virNetTLSContextPtr tls);
+
+bool virNetClientIsEncrypted(virNetClientPtr client);
+
+const char *virNetClientLocalAddrString(virNetClientPtr client);
+const char *virNetClientRemoteAddrString(virNetClientPtr client);
+
+int virNetClientGetTLSKeySize(virNetClientPtr client);
+
+void virNetClientFree(virNetClientPtr client);
+
+#endif /* __VIR_NET_CLIENT_H__ */
diff --git a/src/rpc/virnetclientprogram.c b/src/rpc/virnetclientprogram.c
new file mode 100644
index 0000000..73ae6eb
--- /dev/null
+++ b/src/rpc/virnetclientprogram.c
@@ -0,0 +1,301 @@
+/*
+ * virnetclientprogram.c: generic network RPC client program
+ *
+ * Copyright (C) 2006-2010 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Daniel P. Berrange <berrange at redhat.com>
+ */
+
+#include <config.h>
+
+#include "virnetclientprogram.h"
+#include "virnetclient.h"
+#include "virnetprotocol.h"
+
+#include "memory.h"
+#include "virterror_internal.h"
+#include "logging.h"
+
+#define VIR_FROM_THIS VIR_FROM_RPC
+
+#define virNetError(code, ...) \
+ virReportErrorHelper(NULL, VIR_FROM_RPC, code, __FILE__, \
+ __FUNCTION__, __LINE__, __VA_ARGS__)
+
+struct _virNetClientProgram {
+ int refs;
+
+ unsigned program;
+ unsigned version;
+ virNetClientProgramEventPtr events;
+ size_t nevents;
+ void *eventOpaque;
+};
+
+virNetClientProgramPtr virNetClientProgramNew(unsigned program,
+ unsigned version,
+ virNetClientProgramEventPtr events,
+ size_t nevents,
+ void *eventOpaque)
+{
+ virNetClientProgramPtr prog;
+
+ if (VIR_ALLOC(prog) < 0) {
+ virReportOOMError();
+ return NULL;
+ }
+
+ prog->refs = 1;
+ prog->program = program;
+ prog->version = version;
+ prog->events = events;
+ prog->nevents = nevents;
+ prog->eventOpaque = eventOpaque;
+
+ return prog;
+}
+
+
+void virNetClientProgramRef(virNetClientProgramPtr prog)
+{
+ prog->refs++;
+}
+
+
+void virNetClientProgramFree(virNetClientProgramPtr prog)
+{
+ if (!prog)
+ return;
+
+ prog->refs--;
+ if (prog->refs > 0)
+ return;
+
+ VIR_FREE(prog);
+}
+
+
+int virNetClientProgramMatches(virNetClientProgramPtr prog,
+ virNetMessagePtr msg)
+{
+ if (prog->program == msg->header.prog &&
+ prog->version == msg->header.vers)
+ return 1;
+ return 0;
+}
+
+
+static int virNetClientProgramDispatchError(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
+ virNetMessagePtr msg)
+{
+ virNetMessageError err;
+ int ret = -1;
+
+ memset(&err, 0, sizeof(err));
+
+ if (virNetMessageDecodePayload(msg, (xdrproc_t)xdr_virNetMessageError, &err) < 0)
+ goto cleanup;
+
+ /* XXX what about the old "quiet" errors for missing auth RPC */
+ if (err.domain == VIR_FROM_REMOTE &&
+ err.code == VIR_ERR_RPC &&
+ err.level == VIR_ERR_ERROR &&
+ err.message &&
+ STRPREFIX(*err.message, "unknown procedure")) {
+ virRaiseErrorFull(NULL,
+ __FILE__, __FUNCTION__, __LINE__,
+ err.domain,
+ VIR_ERR_NO_SUPPORT,
+ err.level,
+ err.str1 ? *err.str1 : NULL,
+ err.str2 ? *err.str2 : NULL,
+ err.str3 ? *err.str3 : NULL,
+ err.int1,
+ err.int2,
+ "%s", *err.message);
+ } else {
+ virRaiseErrorFull(NULL,
+ __FILE__, __FUNCTION__, __LINE__,
+ err.domain,
+ err.code,
+ err.level,
+ err.str1 ? *err.str1 : NULL,
+ err.str2 ? *err.str2 : NULL,
+ err.str3 ? *err.str3 : NULL,
+ err.int1,
+ err.int2,
+ "%s", err.message ? *err.message : _("Unknown error"));
+ }
+
+ ret = 0;
+
+cleanup:
+ xdr_free((xdrproc_t)xdr_virNetMessageError, (void*)&err);
+ return ret;
+}
+
+
+static virNetClientProgramEventPtr virNetClientProgramGetEvent(virNetClientProgramPtr prog,
+ int procedure)
+{
+ int i;
+
+ for (i = 0 ; i < prog->nevents ; i++) {
+ if (prog->events[i].proc == procedure)
+ return &prog->events[i];
+ }
+
+ return NULL;
+}
+
+
+int virNetClientProgramDispatch(virNetClientProgramPtr prog,
+ virNetClientPtr client,
+ virNetMessagePtr msg)
+{
+ virNetClientProgramEventPtr event;
+ char *evdata;
+
+ VIR_DEBUG("prog=%d ver=%d type=%d status=%d serial=%d proc=%d",
+ msg->header.prog, msg->header.vers, msg->header.type,
+ msg->header.status, msg->header.serial, msg->header.proc);
+
+ /* Check version, etc. */
+ if (msg->header.prog != prog->program) {
+ VIR_ERROR(_("program mismatch in event (actual %x, expected %x)"),
+ msg->header.prog, prog->program);
+ return -1;
+ }
+
+ if (msg->header.vers != prog->version) {
+ VIR_ERROR(_("version mismatch in event (actual %x, expected %x)"),
+ msg->header.vers, prog->version);
+ return -1;
+ }
+
+ if (msg->header.status != VIR_NET_OK) {
+ VIR_ERROR(_("status mismatch in event (actual %x, expected %x)"),
+ msg->header.status, VIR_NET_OK);
+ return -1;
+ }
+
+ if (msg->header.type != VIR_NET_MESSAGE) {
+ VIR_ERROR(_("type mismatch in event (actual %x, expected %x)"),
+ msg->header.type, VIR_NET_MESSAGE);
+ return -1;
+ }
+
+ event = virNetClientProgramGetEvent(prog, msg->header.proc);
+
+ if (!event) {
+ VIR_ERROR(_("No event expected with procedure %x"),
+ msg->header.proc);
+ return -1;
+ }
+
+ if (VIR_ALLOC_N(evdata, event->msg_len) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (virNetMessageDecodePayload(msg, event->msg_filter, evdata) < 0)
+ goto cleanup;
+
+ event->func(prog, client, &evdata, prog->eventOpaque);
+
+ xdr_free(event->msg_filter, evdata);
+
+cleanup:
+ VIR_FREE(evdata);
+ return 0;
+}
+
+
+int virNetClientProgramCall(virNetClientProgramPtr prog,
+ virNetClientPtr client,
+ unsigned serial,
+ int proc,
+ xdrproc_t args_filter, void *args,
+ xdrproc_t ret_filter, void *ret)
+{
+ virNetMessagePtr msg;
+
+ if (!(msg = virNetMessageNew()))
+ return -1;
+
+ msg->header.prog = prog->program;
+ msg->header.vers = prog->version;
+ msg->header.status = VIR_NET_OK;
+ msg->header.type = VIR_NET_CALL;
+ msg->header.serial = serial;
+ msg->header.proc = proc;
+
+ if (virNetMessageEncodeHeader(msg) < 0)
+ goto error;
+
+ if (virNetMessageEncodePayload(msg, args_filter, args) < 0)
+ goto error;
+
+ if (virNetClientSend(client, msg, true) < 0)
+ goto error;
+
+ /* None of these 3 should ever happen here, because
+ * virNetClientSend should have validated the reply,
+ * but it doesn't hurt to check again.
+ */
+ if (msg->header.type != VIR_NET_REPLY) {
+ virNetError(VIR_ERR_INTERNAL_ERROR,
+ _("Unexpected message type %d"), msg->header.type);
+ goto error;
+ }
+ if (msg->header.proc != proc) {
+ virNetError(VIR_ERR_INTERNAL_ERROR,
+ _("Unexpected message proc %d != %d"),
+ msg->header.proc, proc);
+ goto error;
+ }
+ if (msg->header.serial != serial) {
+ virNetError(VIR_ERR_INTERNAL_ERROR,
+ _("Unexpected message serial %d != %d"),
+ msg->header.serial, serial);
+ goto error;
+ }
+
+ switch (msg->header.status) {
+ case VIR_NET_OK:
+ if (virNetMessageDecodePayload(msg, ret_filter, ret) < 0)
+ goto error;
+ break;
+
+ case VIR_NET_ERROR:
+ virNetClientProgramDispatchError(prog, msg);
+ goto error;
+
+ default:
+ virNetError(VIR_ERR_RPC,
+ _("Unexpected message status %d"), msg->header.status);
+ goto error;
+ }
+
+ VIR_FREE(msg);
+
+ return 0;
+
+error:
+ VIR_FREE(msg);
+ return -1;
+}
diff --git a/src/rpc/virnetclientprogram.h b/src/rpc/virnetclientprogram.h
new file mode 100644
index 0000000..e52e442
--- /dev/null
+++ b/src/rpc/virnetclientprogram.h
@@ -0,0 +1,82 @@
+/*
+ * virnetclientprogram.h: generic network RPC client program
+ *
+ * Copyright (C) 2006-2010 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Daniel P. Berrange <berrange at redhat.com>
+ */
+
+#ifndef __VIR_NET_CLIENT_PROGRAM_H__
+# define __VIR_NET_CLIENT_PROGRAM_H__
+
+# include <rpc/types.h>
+# include <rpc/xdr.h>
+
+# include "virnetmessage.h"
+
+typedef struct _virNetClient virNetClient;
+typedef virNetClient *virNetClientPtr;
+
+typedef struct _virNetClientProgram virNetClientProgram;
+typedef virNetClientProgram *virNetClientProgramPtr;
+
+typedef struct _virNetClientProgramEvent virNetClientProgramEvent;
+typedef virNetClientProgramEvent *virNetClientProgramEventPtr;
+
+typedef struct _virNetClientProgramErrorHandler virNetClientProgramErrorHander;
+typedef virNetClientProgramErrorHander *virNetClientProgramErrorHanderPtr;
+
+
+typedef void (*virNetClientProgramDispatchFunc)(virNetClientProgramPtr prog,
+ virNetClientPtr client,
+ void *msg,
+ void *opaque);
+
+struct _virNetClientProgramEvent {
+ int proc;
+ virNetClientProgramDispatchFunc func;
+ size_t msg_len;
+ xdrproc_t msg_filter;
+};
+
+virNetClientProgramPtr virNetClientProgramNew(unsigned program,
+ unsigned version,
+ virNetClientProgramEventPtr events,
+ size_t nevents,
+ void *eventOpaque);
+
+void virNetClientProgramRef(virNetClientProgramPtr prog);
+
+void virNetClientProgramFree(virNetClientProgramPtr prog);
+
+int virNetClientProgramMatches(virNetClientProgramPtr prog,
+ virNetMessagePtr msg);
+
+int virNetClientProgramDispatch(virNetClientProgramPtr prog,
+ virNetClientPtr client,
+ virNetMessagePtr msg);
+
+int virNetClientProgramCall(virNetClientProgramPtr prog,
+ virNetClientPtr client,
+ unsigned serial,
+ int proc,
+ xdrproc_t args_filter, void *args,
+ xdrproc_t ret_filter, void *ret);
+
+
+
+#endif /* __VIR_NET_CLIENT_PROGRAM_H__ */
--
1.7.2.3
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