[libvirt] [PATCH 07/10] Introduce generic RPC server objects

To facilitate creation of new daemons providing XDR RPC services, pull alot of the libvirtd daemon code into a set of reusable objects. * virNetServer: A server contains one or more services which accept incoming clients. It maintains the list of active clients. It has a list of RPC programs which can be used by clients. When clients produce a complete RPC message, the server passes this onto the corresponding program for handling, and queues any response back with the client. * virNetServerClient: Encapsulates a single client connection. All I/O for the client is handled, reading & writing RPC messages. * virNetServerProgram: Handles processing and dispatch of RPC method calls for a single RPC (program,version). Multiple programs can be registered with the server. * virNetServerService: Encapsulates socket(s) listening for new connections. Each service listens on a single host/port, but may have multiple sockets if on a dual IPv4/6 host. Each new daemon now merely has to define the list of RPC procedures & their handlers. It does not need to deal with any network related functionality at all. --- cfg.mk | 4 + po/POTFILES.in | 3 + src/Makefile.am | 17 +- src/rpc/virnetserver.c | 714 +++++++++++++++++++++++++++++++ src/rpc/virnetserver.h | 80 ++++ src/rpc/virnetserverclient.c | 937 +++++++++++++++++++++++++++++++++++++++++ src/rpc/virnetserverclient.h | 106 +++++ src/rpc/virnetserverprogram.c | 455 ++++++++++++++++++++ src/rpc/virnetserverprogram.h | 107 +++++ src/rpc/virnetserverservice.c | 247 +++++++++++ src/rpc/virnetserverservice.h | 65 +++ 11 files changed, 2734 insertions(+), 1 deletions(-) create mode 100644 src/rpc/virnetserver.c create mode 100644 src/rpc/virnetserver.h create mode 100644 src/rpc/virnetserverclient.c create mode 100644 src/rpc/virnetserverclient.h create mode 100644 src/rpc/virnetserverprogram.c create mode 100644 src/rpc/virnetserverprogram.h create mode 100644 src/rpc/virnetserverservice.c create mode 100644 src/rpc/virnetserverservice.h diff --git a/cfg.mk b/cfg.mk index e12f98a..160f686 100644 --- a/cfg.mk +++ b/cfg.mk @@ -126,6 +126,10 @@ useless_free_options = \ --name=virJSONValueFree \ --name=virLastErrFreeData \ --name=virNetMessageFree \ + --name=virNetServerFree \ + --name=virNetServerClientFree \ + --name=virNetServerProgramFree \ + --name=virNetServerServiceFree \ --name=virNetSocketFree \ --name=virNetSASLContextFree \ --name=virNetSASLSessionFree \ diff --git a/po/POTFILES.in b/po/POTFILES.in index 61ba1f7..e67a53b 100644 --- a/po/POTFILES.in +++ b/po/POTFILES.in @@ -72,6 +72,9 @@ src/remote/remote_driver.c src/rpc/virnetmessage.c src/rpc/virnetsaslcontext.c src/rpc/virnetsocket.c +src/rpc/virnetserver.c +src/rpc/virnetserverclient.c +src/rpc/virnetserverprogram.c src/rpc/virnettlscontext.c src/secret/secret_driver.c src/security/security_apparmor.c diff --git a/src/Makefile.am b/src/Makefile.am index ed0ca56..c4567a1 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -1187,7 +1187,7 @@ else EXTRA_DIST += $(LOCK_DRIVER_SANLOCK_SOURCES) endif -noinst_LTLIBRARIES += libvirt-net-rpc.la +noinst_LTLIBRARIES += libvirt-net-rpc.la libvirt-net-rpc-server.la libvirt_net_rpc_la_SOURCES = \ rpc/virnetmessage.h rpc/virnetmessage.c \ @@ -1214,6 +1214,21 @@ libvirt_net_rpc_la_LDFLAGS = \ libvirt_net_rpc_la_LIBADD = \ $(CYGWIN_EXTRA_LIBADD) +libvirt_net_rpc_server_la_SOURCES = \ + rpc/virnetserverprogram.h rpc/virnetserverprogram.c \ + rpc/virnetserverservice.h rpc/virnetserverservice.c \ + rpc/virnetserverclient.h rpc/virnetserverclient.c \ + rpc/virnetserver.h rpc/virnetserver.c +libvirt_net_rpc_server_la_CFLAGS = \ + $(AM_CFLAGS) +libvirt_net_rpc_server_la_LDFLAGS = \ + $(AM_LDFLAGS) \ + $(CYGWIN_EXTRA_LDFLAGS) \ + $(MINGW_EXTRA_LDFLAGS)l +libvirt_net_rpc_server_la_LIBADD = \ + $(CYGWIN_EXTRA_LIBADD) + + libexec_PROGRAMS = if WITH_LIBVIRTD diff --git a/src/rpc/virnetserver.c b/src/rpc/virnetserver.c new file mode 100644 index 0000000..b71f34e --- /dev/null +++ b/src/rpc/virnetserver.c @@ -0,0 +1,714 @@ +/* + * virnetserver.c: generic network RPC server + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#include <config.h> + +#include <unistd.h> +#include <string.h> + +#include "virnetserver.h" +#include "logging.h" +#include "memory.h" +#include "virterror_internal.h" +#include "threads.h" +#include "threadpool.h" +#include "util.h" +#include "files.h" +#include "event.h" + +#define VIR_FROM_THIS VIR_FROM_RPC +#define virNetError(code, ...) \ + virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \ + __FUNCTION__, __LINE__, __VA_ARGS__) + +typedef struct _virNetServerSignal virNetServerSignal; +typedef virNetServerSignal *virNetServerSignalPtr; + +struct _virNetServerSignal { + struct sigaction oldaction; + int signum; + virNetServerSignalFunc func; + void *opaque; +}; + +typedef struct _virNetServerJob virNetServerJob; +typedef virNetServerJob *virNetServerJobPtr; + +struct _virNetServerJob { + virNetServerClientPtr client; + virNetMessagePtr msg; +}; + +struct _virNetServer { + int refs; + + virMutex lock; + + virThreadPoolPtr workers; + + bool privileged; + + size_t nsignals; + virNetServerSignalPtr *signals; + int sigread; + int sigwrite; + int sigwatch; + + size_t nservices; + virNetServerServicePtr *services; + + size_t nprograms; + virNetServerProgramPtr *programs; + + size_t nclients; + size_t nclients_max; + virNetServerClientPtr *clients; + + unsigned int quit :1; + + virNetTLSContextPtr tls; + + unsigned int autoShutdownTimeout; + virNetServerAutoShutdownFunc autoShutdownFunc; + void *autoShutdownOpaque; + + virNetServerClientInitHook clientInitHook; +}; + + +static void virNetServerLock(virNetServerPtr srv) +{ + virMutexLock(&srv->lock); +} + +static void virNetServerUnlock(virNetServerPtr srv) +{ + virMutexUnlock(&srv->lock); +} + + +static void virNetServerHandleJob(void *jobOpaque, void *opaque) +{ + virNetServerPtr srv = opaque; + virNetServerJobPtr job = jobOpaque; + virNetServerProgramPtr prog = NULL; + size_t i; + + virNetServerClientRef(job->client); + + virNetServerLock(srv); + VIR_DEBUG("server=%p client=%p message=%p", + srv, job->client, job->msg); + + for (i = 0 ; i < srv->nprograms ; i++) { + if (virNetServerProgramMatches(srv->programs[i], job->msg)) { + prog = srv->programs[i]; + break; + } + } + + if (!prog) { + VIR_DEBUG("Cannot find program %d version %d", + job->msg->header.prog, + job->msg->header.vers); + goto error; + } + + virNetServerProgramRef(prog); + virNetServerUnlock(srv); + + if (virNetServerProgramDispatch(prog, + srv, + job->client, + job->msg) < 0) + goto error; + + virNetServerLock(srv); + virNetServerProgramFree(prog); + virNetServerUnlock(srv); + virNetServerClientFree(job->client); + + VIR_FREE(job); + return; + +error: + virNetServerUnlock(srv); + virNetServerProgramFree(prog); + virNetMessageFree(job->msg); + virNetServerClientClose(job->client); + virNetServerClientFree(job->client); + VIR_FREE(job); +} + + +static int virNetServerDispatchNewMessage(virNetServerClientPtr client, + virNetMessagePtr msg, + void *opaque) +{ + virNetServerPtr srv = opaque; + virNetServerJobPtr job; + int ret; + + VIR_DEBUG("server=%p client=%p message=%p", + srv, client, msg); + + if (VIR_ALLOC(job) < 0) { + virReportOOMError(); + return -1; + } + + job->client = client; + job->msg = msg; + + virNetServerLock(srv); + if ((ret = virThreadPoolSendJob(srv->workers, job)) < 0) + VIR_FREE(job); + virNetServerUnlock(srv); + + return ret; +} + + +static int virNetServerDispatchNewClient(virNetServerServicePtr svc ATTRIBUTE_UNUSED, + virNetServerClientPtr client, + void *opaque) +{ + virNetServerPtr srv = opaque; + + virNetServerLock(srv); + + if (srv->nclients >= srv->nclients_max) { + virNetError(VIR_ERR_RPC, + _("Too many active clients (%zu), dropping connection from %s"), + srv->nclients_max, virNetServerClientRemoteAddrString(client)); + goto error; + } + + if (virNetServerClientInit(client) < 0) + goto error; + + if (srv->clientInitHook && + srv->clientInitHook(srv, client) < 0) + goto error; + + if (VIR_EXPAND_N(srv->clients, srv->nclients, 1) < 0) { + virReportOOMError(); + goto error; + } + srv->clients[srv->nclients-1] = client; + virNetServerClientRef(client); + + virNetServerClientSetDispatcher(client, + virNetServerDispatchNewMessage, + srv); + + virNetServerUnlock(srv); + return 0; + +error: + virNetServerUnlock(srv); + return -1; +} + + +static void virNetServerFatalSignal(int sig, siginfo_t * siginfo ATTRIBUTE_UNUSED, + void* context ATTRIBUTE_UNUSED) +{ + struct sigaction sig_action; + int origerrno; + + origerrno = errno; + virLogEmergencyDumpAll(sig); + + /* + * If the signal is fatal, avoid looping over this handler + * by desactivating it + */ +#ifdef SIGUSR2 + if (sig != SIGUSR2) { +#endif + sig_action.sa_handler = SIG_IGN; + sigaction(sig, &sig_action, NULL); +#ifdef SIGUSR2 + } +#endif + errno = origerrno; +} + + +virNetServerPtr virNetServerNew(size_t min_workers, + size_t max_workers, + size_t max_clients, + virNetServerClientInitHook clientInitHook) +{ + virNetServerPtr srv; + struct sigaction sig_action; + + if (VIR_ALLOC(srv) < 0) { + virReportOOMError(); + return NULL; + } + + srv->refs = 1; + + if (!(srv->workers = virThreadPoolNew(min_workers, max_workers, + virNetServerHandleJob, + srv))) + goto error; + + srv->nclients_max = max_clients; + srv->sigwrite = srv->sigread = -1; + srv->clientInitHook = clientInitHook; + srv->privileged = geteuid() == 0 ? true : false; + + if (virMutexInit(&srv->lock) < 0) { + virNetError(VIR_ERR_INTERNAL_ERROR, "%s", + _("cannot initialize mutex")); + goto error; + } + + if (virEventRegisterDefaultImpl() < 0) + goto error; + + memset(&sig_action, 0, sizeof(sig_action)); + sig_action.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &sig_action, NULL); + + /* + * catch fatal errors to dump a log, also hook to USR2 for dynamic + * debugging purposes or testing + */ + sig_action.sa_sigaction = virNetServerFatalSignal; + sigaction(SIGFPE, &sig_action, NULL); + sigaction(SIGSEGV, &sig_action, NULL); + sigaction(SIGILL, &sig_action, NULL); + sigaction(SIGABRT, &sig_action, NULL); +#ifdef SIGBUS + sigaction(SIGBUS, &sig_action, NULL); +#endif +#ifdef SIGUSR2 + sigaction(SIGUSR2, &sig_action, NULL); +#endif + + VIR_DEBUG("srv=%p refs=%d", srv, srv->refs); + return srv; + +error: + virNetServerFree(srv); + return NULL; +} + + +void virNetServerRef(virNetServerPtr srv) +{ + virNetServerLock(srv); + srv->refs++; + VIR_DEBUG("srv=%p refs=%d", srv, srv->refs); + virNetServerUnlock(srv); +} + + +bool virNetServerIsPrivileged(virNetServerPtr srv) +{ + bool priv; + virNetServerLock(srv); + priv = srv->privileged; + virNetServerUnlock(srv); + return priv; +} + + +void virNetServerAutoShutdown(virNetServerPtr srv, + unsigned int timeout, + virNetServerAutoShutdownFunc func, + void *opaque) +{ + virNetServerLock(srv); + + srv->autoShutdownTimeout = timeout; + srv->autoShutdownFunc = func; + srv->autoShutdownOpaque = opaque; + + virNetServerUnlock(srv); +} + + +static sig_atomic_t sigErrors = 0; +static int sigLastErrno = 0; +static int sigWrite = -1; + +static void virNetServerSignalHandler(int sig, siginfo_t * siginfo, + void* context ATTRIBUTE_UNUSED) +{ + int origerrno; + int r; + + /* set the sig num in the struct */ + siginfo->si_signo = sig; + + origerrno = errno; + r = safewrite(sigWrite, siginfo, sizeof(*siginfo)); + if (r == -1) { + sigErrors++; + sigLastErrno = errno; + } + errno = origerrno; +} + +static void +virNetServerSignalEvent(int watch, + int fd ATTRIBUTE_UNUSED, + int events ATTRIBUTE_UNUSED, + void *opaque) { + virNetServerPtr srv = opaque; + siginfo_t siginfo; + int i; + + virNetServerLock(srv); + + if (saferead(srv->sigread, &siginfo, sizeof(siginfo)) != sizeof(siginfo)) { + virReportSystemError(errno, "%s", + _("Failed to read from signal pipe")); + virEventRemoveHandle(watch); + srv->sigwatch = -1; + goto cleanup; + } + + for (i = 0 ; i < srv->nsignals ; i++) { + if (siginfo.si_signo == srv->signals[i]->signum) { + virNetServerSignalFunc func = srv->signals[i]->func; + void *funcopaque = srv->signals[i]->opaque; + virNetServerUnlock(srv); + func(srv, &siginfo, funcopaque); + return; + } + } + + virNetError(VIR_ERR_INTERNAL_ERROR, + _("Unexpected signal received: %d"), siginfo.si_signo); + +cleanup: + virNetServerUnlock(srv); +} + +static int virNetServerSignalSetup(virNetServerPtr srv) +{ + int fds[2]; + + if (srv->sigwrite != -1) + return 0; + + if (pipe(fds) < 0) { + virReportSystemError(errno, "%s", + _("Unable to create signal pipe")); + return -1; + } + + if (virSetNonBlock(fds[0]) < 0 || + virSetNonBlock(fds[1]) < 0 || + virSetCloseExec(fds[0]) < 0 || + virSetCloseExec(fds[1]) < 0) { + virReportSystemError(errno, "%s", + _("Failed to setup pipe flags")); + goto error; + } + + if ((srv->sigwatch = virEventAddHandle(fds[0], + VIR_EVENT_HANDLE_READABLE, + virNetServerSignalEvent, + srv, NULL)) < 0) { + virNetError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to add signal handle watch")); + goto error; + } + + srv->sigread = fds[0]; + srv->sigwrite = fds[1]; + sigWrite = fds[1]; + + return 0; + +error: + VIR_FORCE_CLOSE(fds[0]); + VIR_FORCE_CLOSE(fds[1]); + return -1; +} + +int virNetServerAddSignalHandler(virNetServerPtr srv, + int signum, + virNetServerSignalFunc func, + void *opaque) +{ + virNetServerSignalPtr sigdata; + struct sigaction sig_action; + + virNetServerLock(srv); + + if (virNetServerSignalSetup(srv) < 0) + goto error; + + if (VIR_EXPAND_N(srv->signals, srv->nsignals, 1) < 0) + goto no_memory; + + if (VIR_ALLOC(sigdata) < 0) + goto no_memory; + + sigdata->signum = signum; + sigdata->func = func; + sigdata->opaque = opaque; + + memset(&sig_action, 0, sizeof(sig_action)); + sig_action.sa_sigaction = virNetServerSignalHandler; +#ifdef SA_SIGINFO + sig_action.sa_flags = SA_SIGINFO; +#endif + sigemptyset(&sig_action.sa_mask); + + sigaction(signum, &sig_action, &sigdata->oldaction); + + srv->signals[srv->nsignals-1] = sigdata; + + virNetServerUnlock(srv); + return 0; + +no_memory: + virReportOOMError(); +error: + VIR_FREE(sigdata); + virNetServerUnlock(srv); + return -1; +} + + + +int virNetServerAddService(virNetServerPtr srv, + virNetServerServicePtr svc) +{ + virNetServerLock(srv); + + if (VIR_EXPAND_N(srv->services, srv->nservices, 1) < 0) + goto no_memory; + + srv->services[srv->nservices-1] = svc; + virNetServerServiceRef(svc); + + virNetServerServiceSetDispatcher(svc, + virNetServerDispatchNewClient, + srv); + + virNetServerUnlock(srv); + return 0; + +no_memory: + virReportOOMError(); + virNetServerUnlock(srv); + return -1; +} + +int virNetServerAddProgram(virNetServerPtr srv, + virNetServerProgramPtr prog) +{ + virNetServerLock(srv); + + if (VIR_EXPAND_N(srv->programs, srv->nprograms, 1) < 0) + goto no_memory; + + srv->programs[srv->nprograms-1] = prog; + virNetServerProgramRef(prog); + + virNetServerUnlock(srv); + return 0; + +no_memory: + virReportOOMError(); + virNetServerUnlock(srv); + return -1; +} + +int virNetServerSetTLSContext(virNetServerPtr srv, + virNetTLSContextPtr tls) +{ + srv->tls = tls; + virNetTLSContextRef(tls); + return 0; +} + + +static void virNetServerAutoShutdownTimer(int timerid ATTRIBUTE_UNUSED, + void *opaque) { + virNetServerPtr srv = opaque; + + virNetServerLock(srv); + + if (srv->autoShutdownFunc(srv, srv->autoShutdownOpaque)) { + VIR_DEBUG("Automatic shutdown triggered"); + srv->quit = 1; + } + + virNetServerUnlock(srv); +} + + +void virNetServerUpdateServices(virNetServerPtr srv, + bool enabled) +{ + int i; + + virNetServerLock(srv); + for (i = 0 ; i < srv->nservices ; i++) + virNetServerServiceToggle(srv->services[i], enabled); + + virNetServerUnlock(srv); +} + + +void virNetServerRun(virNetServerPtr srv) +{ + int timerid = -1; + int timerActive = 0; + int i; + + virNetServerLock(srv); + + if (srv->autoShutdownTimeout && + (timerid = virEventAddTimeout(-1, + virNetServerAutoShutdownTimer, + srv, NULL)) < 0) { + virNetError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to register shutdown timeout")); + goto cleanup; + } + + while (!srv->quit) { + /* A shutdown timeout is specified, so check + * if any drivers have active state, if not + * shutdown after timeout seconds + */ + if (srv->autoShutdownTimeout) { + if (timerActive) { + if (srv->clients) { + VIR_DEBUG("Deactivating shutdown timer %d", timerid); + virEventUpdateTimeout(timerid, -1); + timerActive = 0; + } + } else { + if (!srv->clients) { + VIR_DEBUG("Activating shutdown timer %d", timerid); + virEventUpdateTimeout(timerid, + srv->autoShutdownTimeout * 1000); + timerActive = 1; + } + } + } + + virNetServerUnlock(srv); + if (virEventRunDefaultImpl() < 0) { + virNetServerLock(srv); + VIR_DEBUG("Loop iteration error, exiting"); + break; + } + virNetServerLock(srv); + + reprocess: + for (i = 0 ; i < srv->nclients ; i++) { + if (virNetServerClientWantClose(srv->clients[i])) + virNetServerClientClose(srv->clients[i]); + if (virNetServerClientIsClosed(srv->clients[i])) { + virNetServerClientFree(srv->clients[i]); + if (srv->nclients > 1) { + memmove(srv->clients + i, + srv->clients + i + 1, + sizeof(*srv->clients) * (srv->nclients - (i + 1))); + VIR_SHRINK_N(srv->clients, srv->nclients, 1); + } else { + VIR_FREE(srv->clients); + srv->nclients = 0; + } + + goto reprocess; + } + } + } + +cleanup: + virNetServerUnlock(srv); +} + + +void virNetServerQuit(virNetServerPtr srv) +{ + virNetServerLock(srv); + + srv->quit = 1; + + virNetServerUnlock(srv); +} + +void virNetServerFree(virNetServerPtr srv) +{ + int i; + + if (!srv) + return; + + virNetServerLock(srv); + VIR_DEBUG("srv=%p refs=%d", srv, srv->refs); + srv->refs--; + if (srv->refs > 0) { + virNetServerUnlock(srv); + return; + } + + for (i = 0 ; i < srv->nservices ; i++) + virNetServerServiceToggle(srv->services[i], false); + + virThreadPoolFree(srv->workers); + + for (i = 0 ; i < srv->nsignals ; i++) { + sigaction(srv->signals[i]->signum, &srv->signals[i]->oldaction, NULL); + VIR_FREE(srv->signals[i]); + } + VIR_FREE(srv->signals); + VIR_FORCE_CLOSE(srv->sigread); + VIR_FORCE_CLOSE(srv->sigwrite); + if (srv->sigwatch > 0) + virEventRemoveHandle(srv->sigwatch); + + for (i = 0 ; i < srv->nservices ; i++) + virNetServerServiceFree(srv->services[i]); + VIR_FREE(srv->services); + + for (i = 0 ; i < srv->nprograms ; i++) + virNetServerProgramFree(srv->programs[i]); + VIR_FREE(srv->programs); + + for (i = 0 ; i < srv->nclients ; i++) { + virNetServerClientClose(srv->clients[i]); + virNetServerClientFree(srv->clients[i]); + } + VIR_FREE(srv->clients); + + virNetServerUnlock(srv); + virMutexDestroy(&srv->lock); + VIR_FREE(srv); +} diff --git a/src/rpc/virnetserver.h b/src/rpc/virnetserver.h new file mode 100644 index 0000000..d8d7c8e --- /dev/null +++ b/src/rpc/virnetserver.h @@ -0,0 +1,80 @@ +/* + * virnetserver.h: generic network RPC server + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#ifndef __VIR_NET_SERVER_H__ +# define __VIR_NET_SERVER_H__ + +# include <stdbool.h> +# include <signal.h> + +# include "virnettlscontext.h" +# include "virnetserverprogram.h" +# include "virnetserverclient.h" +# include "virnetserverservice.h" + +typedef int (*virNetServerClientInitHook)(virNetServerPtr srv, + virNetServerClientPtr client); + +virNetServerPtr virNetServerNew(size_t min_workers, + size_t max_workers, + size_t max_clients, + virNetServerClientInitHook clientInitHook); + +typedef int (*virNetServerAutoShutdownFunc)(virNetServerPtr srv, void *opaque); + +void virNetServerRef(virNetServerPtr srv); + +bool virNetServerIsPrivileged(virNetServerPtr srv); + +void virNetServerAutoShutdown(virNetServerPtr srv, + unsigned int timeout, + virNetServerAutoShutdownFunc func, + void *opaque); + +typedef void (*virNetServerSignalFunc)(virNetServerPtr srv, siginfo_t *info, void *opaque); + +int virNetServerAddSignalHandler(virNetServerPtr srv, + int signum, + virNetServerSignalFunc func, + void *opaque); + +int virNetServerAddService(virNetServerPtr srv, + virNetServerServicePtr svc); + +int virNetServerAddProgram(virNetServerPtr srv, + virNetServerProgramPtr prog); + +int virNetServerSetTLSContext(virNetServerPtr srv, + virNetTLSContextPtr tls); + +void virNetServerUpdateServices(virNetServerPtr srv, + bool enabled); + +void virNetServerRun(virNetServerPtr srv); + +void virNetServerQuit(virNetServerPtr srv); + +void virNetServerFree(virNetServerPtr srv); + + +#endif diff --git a/src/rpc/virnetserverclient.c b/src/rpc/virnetserverclient.c new file mode 100644 index 0000000..327b121 --- /dev/null +++ b/src/rpc/virnetserverclient.c @@ -0,0 +1,937 @@ +/* + * virnetserverclient.c: generic network RPC server client + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#include <config.h> + +#if HAVE_SASL +# include <sasl/sasl.h> +#endif + +#include "virnetserverclient.h" + +#include "logging.h" +#include "virterror_internal.h" +#include "memory.h" +#include "threads.h" + +#define VIR_FROM_THIS VIR_FROM_RPC +#define virNetError(code, ...) \ + virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \ + __FUNCTION__, __LINE__, __VA_ARGS__) + +/* Allow for filtering of incoming messages to a custom + * dispatch processing queue, instead of the workers. + * This allows for certain types of messages to be handled + * strictly "in order" + */ + +typedef struct _virNetServerClientFilter virNetServerClientFilter; +typedef virNetServerClientFilter *virNetServerClientFilterPtr; + +struct _virNetServerClientFilter { + int id; + virNetServerClientFilterFunc func; + void *opaque; + + virNetServerClientFilterPtr next; +}; + + +struct _virNetServerClient +{ + int refs; + bool wantClose; + virMutex lock; + virNetSocketPtr sock; + int auth; + bool readonly; + char *identity; + virNetTLSContextPtr tlsCtxt; + virNetTLSSessionPtr tls; +#if HAVE_SASL + virNetSASLSessionPtr sasl; +#endif + + /* Count of messages in the 'tx' queue, + * and the server worker pool queue + * ie RPC calls in progress. Does not count + * async events which are not used for + * throttling calculations */ + size_t nrequests; + size_t nrequests_max; + /* Zero or one messages being received. Zero if + * nrequests >= max_clients and throttling */ + virNetMessagePtr rx; + /* Zero or many messages waiting for transmit + * back to client, including async events */ + virNetMessagePtr tx; + + /* Filters to capture messages that would otherwise + * end up on the 'dx' queue */ + virNetServerClientFilterPtr filters; + int nextFilterID; + + virNetServerClientDispatchFunc dispatchFunc; + void *dispatchOpaque; + + void *privateData; + virNetServerClientFreeFunc privateDataFreeFunc; +}; + + +static void virNetServerClientDispatchEvent(virNetSocketPtr sock, int events, void *opaque); +static void virNetServerClientUpdateEvent(virNetServerClientPtr client); + +static void virNetServerClientLock(virNetServerClientPtr client) +{ + virMutexLock(&client->lock); +} + +static void virNetServerClientUnlock(virNetServerClientPtr client) +{ + virMutexUnlock(&client->lock); +} + + +/* + * @client: a locked client object + */ +static int +virNetServerClientCalculateHandleMode(virNetServerClientPtr client) { + int mode = 0; + + + VIR_DEBUG("tls=%p hs=%d, rx=%p tx=%p", + client->tls, + client->tls ? virNetTLSSessionGetHandshakeStatus(client->tls) : -1, + client->rx, + client->tx); + if (!client->sock || client->wantClose) + return 0; + + if (client->tls) { + switch (virNetTLSSessionGetHandshakeStatus(client->tls)) { + case VIR_NET_TLS_HANDSHAKE_RECVING: + mode |= VIR_EVENT_HANDLE_READABLE; + break; + case VIR_NET_TLS_HANDSHAKE_SENDING: + mode |= VIR_EVENT_HANDLE_WRITABLE; + break; + default: + case VIR_NET_TLS_HANDSHAKE_COMPLETE: + if (client->rx) + mode |= VIR_EVENT_HANDLE_READABLE; + if (client->tx) + mode |= VIR_EVENT_HANDLE_WRITABLE; + } + } else { + /* If there is a message on the rx queue then + * we're wanting more input */ + if (client->rx) + mode |= VIR_EVENT_HANDLE_READABLE; + + /* If there are one or more messages to send back to client, + then monitor for writability on socket */ + if (client->tx) + mode |= VIR_EVENT_HANDLE_WRITABLE; + } + VIR_DEBUG("mode=%d", mode); + return mode; +} + +/* + * @server: a locked or unlocked server object + * @client: a locked client object + */ +static int virNetServerClientRegisterEvent(virNetServerClientPtr client) +{ + int mode = virNetServerClientCalculateHandleMode(client); + + VIR_DEBUG("Registering client event callback %d", mode); + if (virNetSocketAddIOCallback(client->sock, + mode, + virNetServerClientDispatchEvent, + client) < 0) + return -1; + + return 0; +} + +/* + * @client: a locked client object + */ +static void virNetServerClientUpdateEvent(virNetServerClientPtr client) +{ + int mode; + + if (!client->sock) + return; + + mode = virNetServerClientCalculateHandleMode(client); + + virNetSocketUpdateIOCallback(client->sock, mode); +} + + +int virNetServerClientAddFilter(virNetServerClientPtr client, + virNetServerClientFilterFunc func, + void *opaque) +{ + virNetServerClientFilterPtr filter; + int ret = -1; + + virNetServerClientLock(client); + + if (VIR_ALLOC(filter) < 0) { + virReportOOMError(); + goto cleanup; + } + + filter->id = client->nextFilterID++; + filter->func = func; + filter->opaque = opaque; + + filter->next = client->filters; + client->filters = filter; + + ret = filter->id; + +cleanup: + virNetServerClientUnlock(client); + return ret; +} + + +void virNetServerClientRemoveFilter(virNetServerClientPtr client, + int filterID) +{ + virNetServerClientFilterPtr tmp, prev; + virNetServerClientLock(client); + + prev = NULL; + tmp = client->filters; + while (tmp) { + if (tmp->id == filterID) { + if (prev) + prev->next = tmp->next; + else + client->filters = tmp->next; + + VIR_FREE(tmp); + break; + } + tmp = tmp->next; + } + + virNetServerClientUnlock(client); +} + + +/* Check the client's access. */ +static int +virNetServerClientCheckAccess(virNetServerClientPtr client) +{ + virNetMessagePtr confirm; + + /* Verify client certificate. */ + if (virNetTLSContextCheckCertificate(client->tlsCtxt, client->tls) < 0) + return -1; + + if (client->tx) { + VIR_DEBUG("client had unexpected data pending tx after access check"); + return -1; + } + + if (!(confirm = virNetMessageNew())) + return -1; + + /* Checks have succeeded. Write a '\1' byte back to the client to + * indicate this (otherwise the socket is abruptly closed). + * (NB. The '\1' byte is sent in an encrypted record). + */ + confirm->bufferLength = 1; + confirm->bufferOffset = 0; + confirm->buffer[0] = '\1'; + + client->tx = confirm; + + return 0; +} + + +virNetServerClientPtr virNetServerClientNew(virNetSocketPtr sock, + int auth, + bool readonly, + virNetTLSContextPtr tls) +{ + virNetServerClientPtr client; + + VIR_DEBUG("sock=%p auth=%d tls=%p", sock, auth, tls); + + if (VIR_ALLOC(client) < 0) { + virReportOOMError(); + return NULL; + } + + if (virMutexInit(&client->lock) < 0) + goto error; + + client->refs = 1; + client->sock = sock; + client->auth = auth; + client->readonly = readonly; + client->tlsCtxt = tls; + client->nrequests_max = 10; /* XXX */ + + if (tls) + virNetTLSContextRef(tls); + + /* Prepare one for packet receive */ + if (!(client->rx = virNetMessageNew())) + goto error; + client->rx->bufferLength = VIR_NET_MESSAGE_LEN_MAX; + client->nrequests = 1; + + VIR_DEBUG("client=%p refs=%d", client, client->refs); + + return client; + +error: + /* XXX ref counting is better than this */ + client->sock = NULL; /* Caller owns 'sock' upon failure */ + virNetServerClientFree(client); + return NULL; +} + +void virNetServerClientRef(virNetServerClientPtr client) +{ + virNetServerClientLock(client); + client->refs++; + VIR_DEBUG("client=%p refs=%d", client, client->refs); + virNetServerClientUnlock(client); +} + + +int virNetServerClientGetAuth(virNetServerClientPtr client) +{ + int auth; + virNetServerClientLock(client); + auth = client->auth; + virNetServerClientUnlock(client); + return auth; +} + +bool virNetServerClientGetReadonly(virNetServerClientPtr client) +{ + bool readonly; + virNetServerClientLock(client); + readonly = client->readonly; + virNetServerClientUnlock(client); + return readonly; +} + + +bool virNetServerClientHasTLSSession(virNetServerClientPtr client) +{ + bool has; + virNetServerClientLock(client); + has = client->tls ? true : false; + virNetServerClientUnlock(client); + return has; +} + +int virNetServerClientGetTLSKeySize(virNetServerClientPtr client) +{ + int size = 0; + virNetServerClientLock(client); + if (client->tls) + size = virNetTLSSessionGetKeySize(client->tls); + virNetServerClientUnlock(client); + return size; +} + +int virNetServerClientGetFD(virNetServerClientPtr client) +{ + int fd = 0; + virNetServerClientLock(client); + fd = virNetSocketGetFD(client->sock); + virNetServerClientUnlock(client); + return fd; +} + +int virNetServerClientGetLocalIdentity(virNetServerClientPtr client, + uid_t *uid, pid_t *pid) +{ + int ret; + virNetServerClientLock(client); + ret = virNetSocketGetLocalIdentity(client->sock, uid, pid); + virNetServerClientUnlock(client); + return ret; +} + +bool virNetServerClientIsSecure(virNetServerClientPtr client) +{ + bool secure = false; + virNetServerClientLock(client); + if (client->tls) + secure = true; +#if HAVE_SASL + if (client->sasl) + secure = true; +#endif + if (virNetSocketIsLocal(client->sock)) + secure = true; + virNetServerClientUnlock(client); + return secure; +} + + +#if HAVE_SASL +void virNetServerClientSetSASLSession(virNetServerClientPtr client, + virNetSASLSessionPtr sasl) +{ + /* We don't set the sasl session on the socket here + * because we need to send out the auth confirmation + * in the clear. Only once we complete the next 'tx' + * operation do we switch to SASL mode + */ + virNetServerClientLock(client); + client->sasl = sasl; + virNetSASLSessionRef(sasl); + virNetServerClientUnlock(client); +} +#endif + + +int virNetServerClientSetIdentity(virNetServerClientPtr client, + const char *identity) +{ + int ret = -1; + virNetServerClientLock(client); + if (!(client->identity = strdup(identity))) { + virReportOOMError(); + goto error; + } + ret = 0; + +error: + virNetServerClientUnlock(client); + return ret; +} + +const char *virNetServerClientGetIdentity(virNetServerClientPtr client) +{ + const char *identity; + virNetServerClientLock(client); + identity = client->identity; + virNetServerClientLock(client); + return identity; +} + +void virNetServerClientSetPrivateData(virNetServerClientPtr client, + void *opaque, + virNetServerClientFreeFunc ff) +{ + virNetServerClientLock(client); + + if (client->privateData && + client->privateDataFreeFunc) + client->privateDataFreeFunc(client->privateData); + + client->privateData = opaque; + client->privateDataFreeFunc = ff; + + virNetServerClientUnlock(client); +} + + +void *virNetServerClientGetPrivateData(virNetServerClientPtr client) +{ + void *data; + virNetServerClientLock(client); + data = client->privateData; + virNetServerClientUnlock(client); + return data; +} + + +void virNetServerClientSetDispatcher(virNetServerClientPtr client, + virNetServerClientDispatchFunc func, + void *opaque) +{ + virNetServerClientLock(client); + client->dispatchFunc = func; + client->dispatchOpaque = opaque; + virNetServerClientUnlock(client); +} + + +const char *virNetServerClientLocalAddrString(virNetServerClientPtr client) +{ + return virNetSocketLocalAddrString(client->sock); +} + + +const char *virNetServerClientRemoteAddrString(virNetServerClientPtr client) +{ + return virNetSocketRemoteAddrString(client->sock); +} + + +void virNetServerClientFree(virNetServerClientPtr client) +{ + if (!client) + return; + + virNetServerClientLock(client); + VIR_DEBUG("client=%p refs=%d", client, client->refs); + + client->refs--; + if (client->refs > 0) { + virNetServerClientUnlock(client); + return; + } + + if (client->privateData && + client->privateDataFreeFunc) + client->privateDataFreeFunc(client->privateData); + + VIR_FREE(client->identity); +#if HAVE_SASL + virNetSASLSessionFree(client->sasl); +#endif + virNetTLSSessionFree(client->tls); + virNetTLSContextFree(client->tlsCtxt); + virNetSocketFree(client->sock); + virNetServerClientUnlock(client); + virMutexDestroy(&client->lock); + VIR_FREE(client); +} + + +/* + * + * We don't free stuff here, merely disconnect the client's + * network socket & resources. + * + * Full free of the client is done later in a safe point + * where it can be guaranteed it is no longer in use + */ +void virNetServerClientClose(virNetServerClientPtr client) +{ + virNetServerClientLock(client); + VIR_DEBUG("client=%p refs=%d", client, client->refs); + if (!client->sock) { + virNetServerClientUnlock(client); + return; + } + + /* Do now, even though we don't close the socket + * until end, to ensure we don't get invoked + * again due to tls shutdown */ + if (client->sock) + virNetSocketRemoveIOCallback(client->sock); + + if (client->tls) { + virNetTLSSessionFree(client->tls); + client->tls = NULL; + } + if (client->sock) { + virNetSocketFree(client->sock); + client->sock = NULL; + } + + while (client->rx) { + virNetMessagePtr msg + = virNetMessageQueueServe(&client->rx); + virNetMessageFree(msg); + } + while (client->tx) { + virNetMessagePtr msg + = virNetMessageQueueServe(&client->tx); + virNetMessageFree(msg); + } + + virNetServerClientUnlock(client); +} + + +bool virNetServerClientIsClosed(virNetServerClientPtr client) +{ + bool closed; + virNetServerClientLock(client); + closed = client->sock == NULL ? true : false; + virNetServerClientUnlock(client); + return closed; +} + +void virNetServerClientMarkClose(virNetServerClientPtr client) +{ + virNetServerClientLock(client); + client->wantClose = true; + virNetServerClientUnlock(client); +} + +bool virNetServerClientWantClose(virNetServerClientPtr client) +{ + bool wantClose; + virNetServerClientLock(client); + wantClose = client->wantClose; + virNetServerClientUnlock(client); + return wantClose; +} + + +int virNetServerClientInit(virNetServerClientPtr client) +{ + virNetServerClientLock(client); + + if (!client->tlsCtxt) { + /* Plain socket, so prepare to read first message */ + if (virNetServerClientRegisterEvent(client) < 0) + goto error; + } else { + int ret; + + if (!(client->tls = virNetTLSSessionNew(client->tlsCtxt, + NULL))) + goto error; + + virNetSocketSetTLSSession(client->sock, + client->tls); + + /* Begin the TLS handshake. */ + ret = virNetTLSSessionHandshake(client->tls); + if (ret == 0) { + /* Unlikely, but ... Next step is to check the certificate. */ + if (virNetServerClientCheckAccess(client) < 0) + goto error; + + /* Handshake & cert check OK, so prepare to read first message */ + if (virNetServerClientRegisterEvent(client) < 0) + goto error; + } else if (ret > 0) { + /* Most likely, need to do more handshake data */ + if (virNetServerClientRegisterEvent(client) < 0) + goto error; + } else { + goto error; + } + } + + virNetServerClientUnlock(client); + return 0; + +error: + client->wantClose = true; + virNetServerClientUnlock(client); + return -1; +} + + + +/* + * Read data into buffer using wire decoding (plain or TLS) + * + * Returns: + * -1 on error or EOF + * 0 on EAGAIN + * n number of bytes + */ +static ssize_t virNetServerClientRead(virNetServerClientPtr client) +{ + ssize_t ret; + + if (client->rx->bufferLength <= client->rx->bufferOffset) { + virNetError(VIR_ERR_RPC, + _("unexpected zero/negative length request %lld"), + (long long int)(client->rx->bufferLength - client->rx->bufferOffset)); + client->wantClose = true; + return -1; + } + + ret = virNetSocketRead(client->sock, + client->rx->buffer + client->rx->bufferOffset, + client->rx->bufferLength - client->rx->bufferOffset); + + if (ret <= 0) + return ret; + + client->rx->bufferOffset += ret; + return ret; +} + + +/* + * Read data until we get a complete message to process + */ +static void virNetServerClientDispatchRead(virNetServerClientPtr client) +{ +readmore: + if (virNetServerClientRead(client) < 0) { + client->wantClose = true; + return; /* Error */ + } + + if (client->rx->bufferOffset < client->rx->bufferLength) + return; /* Still not read enough */ + + /* Either done with length word header */ + if (client->rx->bufferLength == VIR_NET_MESSAGE_LEN_MAX) { + if (virNetMessageDecodeLength(client->rx) < 0) + return; + + virNetServerClientUpdateEvent(client); + + /* Try and read payload immediately instead of going back + into poll() because chances are the data is already + waiting for us */ + goto readmore; + } else { + /* Grab the completed message */ + virNetMessagePtr msg = virNetMessageQueueServe(&client->rx); + virNetServerClientFilterPtr filter; + + /* Decode the header so we can use it for routing decisions */ + if (virNetMessageDecodeHeader(msg) < 0) { + virNetMessageFree(msg); + client->wantClose = true; + return; + } + + /* Maybe send off for queue against a filter */ + filter = client->filters; + while (filter) { + int ret = filter->func(client, msg, filter->opaque); + if (ret < 0 || ret > 0) { + virNetMessageFree(msg); + msg = NULL; + if (ret < 0) + client->wantClose = true; + break; + } + + filter = filter->next; + } + + /* Send off to for normal dispatch to workers */ + if (msg) { + if (!client->dispatchFunc || + client->dispatchFunc(client, msg, client->dispatchOpaque) < 0) { + virNetMessageFree(msg); + client->wantClose = true; + return; + } + } + + /* Possibly need to create another receive buffer */ + if (client->nrequests < client->nrequests_max) { + if (!(client->rx = virNetMessageNew())) { + client->wantClose = true; + } + client->rx->bufferLength = VIR_NET_MESSAGE_LEN_MAX; + client->nrequests++; + } + virNetServerClientUpdateEvent(client); + } +} + + +/* + * Send client->tx using no encoding + * + * Returns: + * -1 on error or EOF + * 0 on EAGAIN + * n number of bytes + */ +static ssize_t virNetServerClientWrite(virNetServerClientPtr client) +{ + ssize_t ret; + + if (client->tx->bufferLength < client->tx->bufferOffset) { + virNetError(VIR_ERR_RPC, + _("unexpected zero/negative length request %lld"), + (long long int)(client->tx->bufferLength - client->tx->bufferOffset)); + client->wantClose = true; + return -1; + } + + if (client->tx->bufferLength == client->tx->bufferOffset) + return 1; + + ret = virNetSocketWrite(client->sock, + client->tx->buffer + client->tx->bufferOffset, + client->tx->bufferLength - client->tx->bufferOffset); + if (ret <= 0) + return ret; /* -1 error, 0 = egain */ + + client->tx->bufferOffset += ret; + return ret; +} + + +/* + * Process all queued client->tx messages until + * we would block on I/O + */ +static void +virNetServerClientDispatchWrite(virNetServerClientPtr client) +{ + while (client->tx) { + ssize_t ret; + + ret = virNetServerClientWrite(client); + if (ret < 0) { + client->wantClose = true; + return; + } + if (ret == 0) + return; /* Would block on write EAGAIN */ + + if (client->tx->bufferOffset == client->tx->bufferLength) { + virNetMessagePtr msg; +#if HAVE_SASL + /* Completed this 'tx' operation, so now read for all + * future rx/tx to be under a SASL SSF layer + */ + if (client->sasl) { + virNetSocketSetSASLSession(client->sock, client->sasl); + virNetSASLSessionFree(client->sasl); + client->sasl = NULL; + } +#endif + + /* Get finished msg from head of tx queue */ + msg = virNetMessageQueueServe(&client->tx); + + if (msg->header.type == VIR_NET_REPLY) { + client->nrequests--; + /* See if the recv queue is currently throttled */ + if (!client->rx && + client->nrequests < client->nrequests_max) { + /* Ready to recv more messages */ + client->rx = msg; + client->rx->bufferLength = VIR_NET_MESSAGE_LEN_MAX; + msg = NULL; + client->nrequests++; + } + } + + virNetMessageFree(msg); + + virNetServerClientUpdateEvent(client); + } + } +} + +static void +virNetServerClientDispatchHandshake(virNetServerClientPtr client) +{ + int ret; + /* Continue the handshake. */ + ret = virNetTLSSessionHandshake(client->tls); + if (ret == 0) { + /* Finished. Next step is to check the certificate. */ + if (virNetServerClientCheckAccess(client) < 0) + client->wantClose = true; + else + virNetServerClientUpdateEvent(client); + } else if (ret > 0) { + /* Carry on waiting for more handshake. Update + the events just in case handshake data flow + direction has changed */ + virNetServerClientUpdateEvent (client); + } else { + /* Fatal error in handshake */ + client->wantClose = true; + } +} + +static void +virNetServerClientDispatchEvent(virNetSocketPtr sock, int events, void *opaque) +{ + virNetServerClientPtr client = opaque; + + virNetServerClientLock(client); + + if (client->sock != sock) { + virNetSocketRemoveIOCallback(sock); + virNetServerClientUnlock(client); + return; + } + + if (events & (VIR_EVENT_HANDLE_WRITABLE | + VIR_EVENT_HANDLE_READABLE)) { + if (client->tls && + virNetTLSSessionGetHandshakeStatus(client->tls) != + VIR_NET_TLS_HANDSHAKE_COMPLETE) { + virNetServerClientDispatchHandshake(client); + } else { + if (events & VIR_EVENT_HANDLE_WRITABLE) + virNetServerClientDispatchWrite(client); + if (events & VIR_EVENT_HANDLE_READABLE) + virNetServerClientDispatchRead(client); + } + } + + /* NB, will get HANGUP + READABLE at same time upon + * disconnect */ + if (events & (VIR_EVENT_HANDLE_ERROR | + VIR_EVENT_HANDLE_HANGUP)) + client->wantClose = true; + + virNetServerClientUnlock(client); +} + + +int virNetServerClientSendMessage(virNetServerClientPtr client, + virNetMessagePtr msg) +{ + int ret = -1; + VIR_DEBUG("msg=%p proc=%d len=%zu offset=%zu", + msg, msg->header.proc, + msg->bufferLength, msg->bufferOffset); + virNetServerClientLock(client); + + if (client->sock && !client->wantClose) { + virNetMessageQueuePush(&client->tx, msg); + + virNetServerClientUpdateEvent(client); + ret = 0; + } + + virNetServerClientUnlock(client); + return ret; +} + + +bool virNetServerClientNeedAuth(virNetServerClientPtr client) +{ + bool need = false; + virNetServerClientLock(client); + if (client->auth && !client->identity) + need = true; + virNetServerClientUnlock(client); + return need; +} diff --git a/src/rpc/virnetserverclient.h b/src/rpc/virnetserverclient.h new file mode 100644 index 0000000..0994890 --- /dev/null +++ b/src/rpc/virnetserverclient.h @@ -0,0 +1,106 @@ +/* + * virnetserverclient.h: generic network RPC server client + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#ifndef __VIR_NET_SERVER_CLIENT_H__ +# define __VIR_NET_SERVER_CLIENT_H__ + +# include "virnetsocket.h" +# include "virnetmessage.h" + +typedef struct _virNetServerClient virNetServerClient; +typedef virNetServerClient *virNetServerClientPtr; + +typedef int (*virNetServerClientDispatchFunc)(virNetServerClientPtr client, + virNetMessagePtr msg, + void *opaque); + +typedef int (*virNetServerClientFilterFunc)(virNetServerClientPtr client, + virNetMessagePtr msg, + void *opaque); + +virNetServerClientPtr virNetServerClientNew(virNetSocketPtr sock, + int auth, + bool readonly, + virNetTLSContextPtr tls); + +int virNetServerClientAddFilter(virNetServerClientPtr client, + virNetServerClientFilterFunc func, + void *opaque); + +void virNetServerClientRemoveFilter(virNetServerClientPtr client, + int filterID); + +int virNetServerClientGetAuth(virNetServerClientPtr client); +bool virNetServerClientGetReadonly(virNetServerClientPtr client); + +bool virNetServerClientHasTLSSession(virNetServerClientPtr client); +int virNetServerClientGetTLSKeySize(virNetServerClientPtr client); + +# ifdef HAVE_SASL +void virNetServerClientSetSASLSession(virNetServerClientPtr client, + virNetSASLSessionPtr sasl); +# endif + +int virNetServerClientGetFD(virNetServerClientPtr client); + +bool virNetServerClientIsSecure(virNetServerClientPtr client); + +int virNetServerClientSetIdentity(virNetServerClientPtr client, + const char *identity); +const char *virNetServerClientGetIdentity(virNetServerClientPtr client); + +int virNetServerClientGetLocalIdentity(virNetServerClientPtr client, + uid_t *uid, pid_t *pid); + +void virNetServerClientRef(virNetServerClientPtr client); + +typedef void (*virNetServerClientFreeFunc)(void *data); + +void virNetServerClientSetPrivateData(virNetServerClientPtr client, + void *opaque, + virNetServerClientFreeFunc ff); +void *virNetServerClientGetPrivateData(virNetServerClientPtr client); + +void virNetServerClientSetDispatcher(virNetServerClientPtr client, + virNetServerClientDispatchFunc func, + void *opaque); +void virNetServerClientClose(virNetServerClientPtr client); + +bool virNetServerClientIsClosed(virNetServerClientPtr client); +void virNetServerClientMarkClose(virNetServerClientPtr client); +bool virNetServerClientWantClose(virNetServerClientPtr client); + +int virNetServerClientInit(virNetServerClientPtr client); + +const char *virNetServerClientLocalAddrString(virNetServerClientPtr client); +const char *virNetServerClientRemoteAddrString(virNetServerClientPtr client); + +int virNetServerClientSendMessage(virNetServerClientPtr client, + virNetMessagePtr msg); + +bool virNetServerClientNeedAuth(virNetServerClientPtr client); + +void virNetServerClientFree(virNetServerClientPtr client); + + +#endif /* __VIR_NET_SERVER_CLIENT_H__ */ diff --git a/src/rpc/virnetserverprogram.c b/src/rpc/virnetserverprogram.c new file mode 100644 index 0000000..0d1577a --- /dev/null +++ b/src/rpc/virnetserverprogram.c @@ -0,0 +1,455 @@ +/* + * virnetserverprogram.c: generic network RPC server program + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#include <config.h> + +#include "virnetserverprogram.h" +#include "virnetserverclient.h" + +#include "memory.h" +#include "virterror_internal.h" +#include "logging.h" + +#define VIR_FROM_THIS VIR_FROM_RPC +#define virNetError(code, ...) \ + virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \ + __FUNCTION__, __LINE__, __VA_ARGS__) + +struct _virNetServerProgram { + int refs; + + unsigned program; + unsigned version; + virNetServerProgramProcPtr procs; + size_t nprocs; +}; + +virNetServerProgramPtr virNetServerProgramNew(unsigned program, + unsigned version, + virNetServerProgramProcPtr procs, + size_t nprocs) +{ + virNetServerProgramPtr prog; + + if (VIR_ALLOC(prog) < 0) { + virReportOOMError(); + return NULL; + } + + prog->refs = 1; + prog->program = program; + prog->version = version; + prog->procs = procs; + prog->nprocs = nprocs; + + VIR_DEBUG("prog=%p refs=%d", prog, prog->refs); + + return prog; +} + + +int virNetServerProgramGetID(virNetServerProgramPtr prog) +{ + return prog->program; +} + + +int virNetServerProgramGetVersion(virNetServerProgramPtr prog) +{ + return prog->version; +} + + +void virNetServerProgramRef(virNetServerProgramPtr prog) +{ + prog->refs++; + VIR_DEBUG("prog=%p refs=%d", prog, prog->refs); +} + + +int virNetServerProgramMatches(virNetServerProgramPtr prog, + virNetMessagePtr msg) +{ + if (prog->program == msg->header.prog && + prog->version == msg->header.vers) + return 1; + return 0; +} + + +static virNetServerProgramProcPtr virNetServerProgramGetProc(virNetServerProgramPtr prog, + int procedure) +{ + if (procedure < 0) + return NULL; + if (procedure >= prog->nprocs) + return NULL; + + return &prog->procs[procedure]; +} + + +static int +virNetServerProgramSendError(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + virNetMessageErrorPtr rerr, + int procedure, + int type, + int serial) +{ + VIR_DEBUG("prog=%d ver=%d proc=%d type=%d serial=%d msg=%p rerr=%p", + prog->program, prog->version, procedure, type, serial, msg, rerr); + + virNetMessageSaveError(rerr); + + /* Return header. */ + msg->header.prog = prog->program; + msg->header.vers = prog->version; + msg->header.proc = procedure; + msg->header.type = type; + msg->header.serial = serial; + msg->header.status = VIR_NET_ERROR; + + if (virNetMessageEncodeHeader(msg) < 0) + goto error; + + if (virNetMessageEncodePayload(msg, (xdrproc_t)xdr_virNetMessageError, rerr) < 0) + goto error; + xdr_free((xdrproc_t)xdr_virNetMessageError, (void*)rerr); + + /* Put reply on end of tx queue to send out */ + if (virNetServerClientSendMessage(client, msg) < 0) + return -1; + + return 0; + +error: + VIR_WARN("Failed to serialize remote error '%p'", rerr); + xdr_free((xdrproc_t)xdr_virNetMessageError, (void*)rerr); + return -1; +} + + +/* + * @client: the client to send the error to + * @req: the message this error is in reply to + * + * Send an error message to the client + * + * Returns 0 if the error was sent, -1 upon fatal error + */ +int +virNetServerProgramSendReplyError(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + virNetMessageErrorPtr rerr, + virNetMessageHeaderPtr req) +{ + /* + * For data streams, errors are sent back as data streams + * For method calls, errors are sent back as method replies + */ + return virNetServerProgramSendError(prog, + client, + msg, + rerr, + req->proc, + req->type == VIR_NET_STREAM ? VIR_NET_STREAM : VIR_NET_REPLY, + req->serial); +} + + +int virNetServerProgramSendStreamError(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + virNetMessageErrorPtr rerr, + int procedure, + int serial) +{ + return virNetServerProgramSendError(prog, + client, + msg, + rerr, + procedure, + VIR_NET_STREAM, + serial); +} + + +static int +virNetServerProgramDispatchCall(virNetServerProgramPtr prog, + virNetServerPtr server, + virNetServerClientPtr client, + virNetMessagePtr msg); + +/* + * @server: the unlocked server object + * @client: the unlocked client object + * @msg: the complete incoming message packet, with header already decoded + * + * This function is intended to be called from worker threads + * when an incoming message is ready to be dispatched for + * execution. + * + * Upon successful return the '@msg' instance will be released + * by this function (or more often, reused to send a reply). + * Upon failure, the '@msg' must be freed by the caller. + * + * Returns 0 if the message was dispatched, -1 upon fatal error + */ +int virNetServerProgramDispatch(virNetServerProgramPtr prog, + virNetServerPtr server, + virNetServerClientPtr client, + virNetMessagePtr msg) +{ + int ret = -1; + virNetMessageError rerr; + + memset(&rerr, 0, sizeof(rerr)); + + 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) { + virNetError(VIR_ERR_RPC, + _("program mismatch (actual %x, expected %x)"), + msg->header.prog, prog->program); + goto error; + } + + if (msg->header.vers != prog->version) { + virNetError(VIR_ERR_RPC, + _("version mismatch (actual %x, expected %x)"), + msg->header.vers, prog->version); + goto error; + } + + switch (msg->header.type) { + case VIR_NET_CALL: + ret = virNetServerProgramDispatchCall(prog, server, client, msg); + break; + + case VIR_NET_STREAM: + /* Since stream data is non-acked, async, we may continue to receive + * stream packets after we closed down a stream. Just drop & ignore + * these. + */ + VIR_INFO("Ignoring unexpected stream data serial=%d proc=%d status=%d", + msg->header.serial, msg->header.proc, msg->header.status); + virNetMessageFree(msg); + ret = 0; + break; + + default: + virNetError(VIR_ERR_RPC, + _("Unexpected message type %u"), + msg->header.type); + goto error; + } + + return ret; + +error: + ret = virNetServerProgramSendReplyError(prog, client, msg, &rerr, &msg->header); + + return ret; +} + + +/* + * @server: the unlocked server object + * @client: the unlocked client object + * @msg: the complete incoming method call, with header already decoded + * + * This method is used to dispatch an message representing an + * incoming method call from a client. It decodes the payload + * to obtain method call arguments, invokves the method and + * then sends a reply packet with the return values + * + * Returns 0 if the reply was sent, or -1 upon fatal error + */ +static int +virNetServerProgramDispatchCall(virNetServerProgramPtr prog, + virNetServerPtr server, + virNetServerClientPtr client, + virNetMessagePtr msg) +{ + char *arg = NULL; + char *ret = NULL; + int rv = -1; + virNetServerProgramProcPtr dispatcher; + virNetMessageError rerr; + + memset(&rerr, 0, sizeof(rerr)); + + if (msg->header.status != VIR_NET_OK) { + virNetError(VIR_ERR_RPC, + _("Unexpected message status %u"), + msg->header.status); + goto error; + } + + dispatcher = virNetServerProgramGetProc(prog, msg->header.proc); + + if (!dispatcher) { + virNetError(VIR_ERR_RPC, + _("unknown procedure: %d"), + msg->header.proc); + goto error; + } + + /* If client is marked as needing auth, don't allow any RPC ops + * which are except for authentication ones + */ + if (virNetServerClientNeedAuth(client) && + dispatcher->needAuth) { + /* Explicitly *NOT* calling remoteDispatchAuthError() because + we want back-compatability with libvirt clients which don't + support the VIR_ERR_AUTH_FAILED error code */ + virNetError(VIR_ERR_RPC, + "%s", _("authentication required")); + goto error; + } + + if (VIR_ALLOC_N(arg, dispatcher->arg_len) < 0) { + virReportOOMError(); + goto error; + } + if (VIR_ALLOC_N(ret, dispatcher->ret_len) < 0) { + virReportOOMError(); + goto error; + } + + if (virNetMessageDecodePayload(msg, dispatcher->arg_filter, arg) < 0) + goto error; + + /* + * When the RPC handler is called: + * + * - Server object is unlocked + * - Client object is unlocked + * + * Without locking, it is safe to use: + * + * 'args and 'ret' + */ + rv = (dispatcher->func)(server, client, &msg->header, &rerr, arg, ret); + + xdr_free(dispatcher->arg_filter, arg); + + if (rv < 0) + goto error; + + /* Return header. We're re-using same message object, so + * only need to tweak type/status fields */ + /*msg->header.prog = msg->header.prog;*/ + /*msg->header.vers = msg->header.vers;*/ + /*msg->header.proc = msg->header.proc;*/ + msg->header.type = VIR_NET_REPLY; + /*msg->header.serial = msg->header.serial;*/ + msg->header.status = VIR_NET_OK; + + if (virNetMessageEncodeHeader(msg) < 0) { + xdr_free(dispatcher->ret_filter, ret); + goto error; + } + + if (virNetMessageEncodePayload(msg, dispatcher->ret_filter, ret) < 0) { + xdr_free(dispatcher->ret_filter, ret); + goto error; + } + + xdr_free(dispatcher->ret_filter, ret); + VIR_FREE(arg); + VIR_FREE(ret); + + /* Put reply on end of tx queue to send out */ + return virNetServerClientSendMessage(client, msg); + +error: + /* Bad stuff (de-)serializing message, but we have an + * RPC error message we can send back to the client */ + rv = virNetServerProgramSendReplyError(prog, client, msg, &rerr, &msg->header); + + VIR_FREE(arg); + VIR_FREE(ret); + + return rv; +} + + +int virNetServerProgramSendStreamData(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + int procedure, + int serial, + const char *data, + size_t len) +{ + VIR_DEBUG("client=%p msg=%p data=%p len=%zu", client, msg, data, len); + + /* Return header. We're reusing same message object, so + * only need to tweak type/status fields */ + msg->header.prog = prog->program; + msg->header.vers = prog->version; + msg->header.proc = procedure; + msg->header.type = VIR_NET_STREAM; + msg->header.serial = serial; + /* + * NB + * data != NULL + len > 0 => REMOTE_CONTINUE (Sending back data) + * data != NULL + len == 0 => REMOTE_CONTINUE (Sending read EOF) + * data == NULL => REMOTE_OK (Sending finish handshake confirmation) + */ + msg->header.status = data ? VIR_NET_CONTINUE : VIR_NET_OK; + + if (virNetMessageEncodeHeader(msg) < 0) + return -1; + + if (data && len) { + if (virNetMessageEncodePayloadRaw(msg, data, len) < 0) + return -1; + + VIR_DEBUG("Total %zu", msg->bufferOffset); + } + + return virNetServerClientSendMessage(client, msg); +} + + +void virNetServerProgramFree(virNetServerProgramPtr prog) +{ + if (!prog) + return; + + VIR_DEBUG("prog=%p refs=%d", prog, prog->refs); + + prog->refs--; + if (prog->refs > 0) + return; + + VIR_FREE(prog); +} diff --git a/src/rpc/virnetserverprogram.h b/src/rpc/virnetserverprogram.h new file mode 100644 index 0000000..b68a3ef --- /dev/null +++ b/src/rpc/virnetserverprogram.h @@ -0,0 +1,107 @@ +/* + * virnetserverprogram.h: generic network RPC server program + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#ifndef __VIR_NET_PROGRAM_H__ +# define __VIR_NET_PROGRAM_H__ + +# include <stdbool.h> + +# include "virnetmessage.h" +# include "virnetserverclient.h" + +typedef struct _virNetServer virNetServer; +typedef virNetServer *virNetServerPtr; + +typedef struct _virNetServerService virNetServerService; +typedef virNetServerService *virNetServerServicePtr; + +typedef struct _virNetServerProgram virNetServerProgram; +typedef virNetServerProgram *virNetServerProgramPtr; + +typedef struct _virNetServerProgramProc virNetServerProgramProc; +typedef virNetServerProgramProc *virNetServerProgramProcPtr; + +typedef struct _virNetServerProgramErrorHandler virNetServerProgramErrorHander; +typedef virNetServerProgramErrorHander *virNetServerProgramErrorHanderPtr; + +typedef int (*virNetServerProgramDispatchFunc)(virNetServerPtr server, + virNetServerClientPtr client, + virNetMessageHeaderPtr hdr, + virNetMessageErrorPtr rerr, + void *args, + void *ret); + +struct _virNetServerProgramProc { + virNetServerProgramDispatchFunc func; + size_t arg_len; + xdrproc_t arg_filter; + size_t ret_len; + xdrproc_t ret_filter; + bool needAuth; +}; + +virNetServerProgramPtr virNetServerProgramNew(unsigned program, + unsigned version, + virNetServerProgramProcPtr procs, + size_t nprocs); + +int virNetServerProgramGetID(virNetServerProgramPtr prog); +int virNetServerProgramGetVersion(virNetServerProgramPtr prog); + +void virNetServerProgramRef(virNetServerProgramPtr prog); + +int virNetServerProgramMatches(virNetServerProgramPtr prog, + virNetMessagePtr msg); + +int virNetServerProgramDispatch(virNetServerProgramPtr prog, + virNetServerPtr server, + virNetServerClientPtr client, + virNetMessagePtr msg); + +int virNetServerProgramSendReplyError(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + virNetMessageErrorPtr rerr, + virNetMessageHeaderPtr req); + +int virNetServerProgramSendStreamError(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + virNetMessageErrorPtr rerr, + int procedure, + int serial); + +int virNetServerProgramSendStreamData(virNetServerProgramPtr prog, + virNetServerClientPtr client, + virNetMessagePtr msg, + int procedure, + int serial, + const char *data, + size_t len); + +void virNetServerProgramFree(virNetServerProgramPtr prog); + + + + +#endif /* __VIR_NET_SERVER_PROGRAM_H__ */ diff --git a/src/rpc/virnetserverservice.c b/src/rpc/virnetserverservice.c new file mode 100644 index 0000000..0cc65c3 --- /dev/null +++ b/src/rpc/virnetserverservice.c @@ -0,0 +1,247 @@ +/* + * virnetserverservice.c: generic network RPC server service + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#include <config.h> + +#include "virnetserverservice.h" + +#include "memory.h" +#include "virterror_internal.h" + + +#define VIR_FROM_THIS VIR_FROM_RPC + +struct _virNetServerService { + int refs; + + size_t nsocks; + virNetSocketPtr *socks; + + int auth; + bool readonly; + + virNetTLSContextPtr tls; + + virNetServerServiceDispatchFunc dispatchFunc; + void *dispatchOpaque; +}; + + + +static void virNetServerServiceAccept(virNetSocketPtr sock, + int events ATTRIBUTE_UNUSED, + void *opaque) +{ + virNetServerServicePtr svc = opaque; + virNetServerClientPtr client = NULL; + virNetSocketPtr clientsock = NULL; + + if (virNetSocketAccept(sock, &clientsock) < 0) + goto error; + + if (!clientsock) /* Connection already went away */ + goto cleanup; + + if (!(client = virNetServerClientNew(clientsock, + svc->auth, + svc->readonly, + svc->tls))) + goto error; + + if (!svc->dispatchFunc) + goto error; + + if (svc->dispatchFunc(svc, client, svc->dispatchOpaque) < 0) + virNetServerClientClose(client); + + virNetServerClientFree(client); + +cleanup: + return; + +error: + virNetSocketFree(clientsock); +} + + +virNetServerServicePtr virNetServerServiceNewTCP(const char *nodename, + const char *service, + int auth, + bool readonly, + virNetTLSContextPtr tls) +{ + virNetServerServicePtr svc; + size_t i; + + if (VIR_ALLOC(svc) < 0) + goto no_memory; + + svc->refs = 1; + svc->auth = auth; + svc->readonly = readonly; + svc->tls = tls; + if (tls) + virNetTLSContextRef(tls); + + if (virNetSocketNewListenTCP(nodename, + service, + &svc->socks, + &svc->nsocks) < 0) + goto error; + + for (i = 0 ; i < svc->nsocks ; i++) { + if (virNetSocketListen(svc->socks[i]) < 0) + goto error; + + /* IO callback is initially disabled, until we're ready + * to deal with incoming clients */ + if (virNetSocketAddIOCallback(svc->socks[i], + 0, + virNetServerServiceAccept, + svc) < 0) + goto error; + } + + + return svc; + +no_memory: + virReportOOMError(); +error: + virNetServerServiceFree(svc); + return NULL; +} + + +virNetServerServicePtr virNetServerServiceNewUNIX(const char *path, + mode_t mask, + gid_t grp, + int auth, + bool readonly, + virNetTLSContextPtr tls) +{ + virNetServerServicePtr svc; + int i; + + if (VIR_ALLOC(svc) < 0) + goto no_memory; + + svc->refs = 1; + svc->auth = auth; + svc->readonly = readonly; + svc->tls = tls; + if (tls) + virNetTLSContextRef(tls); + + svc->nsocks = 1; + if (VIR_ALLOC_N(svc->socks, svc->nsocks) < 0) + goto no_memory; + + if (virNetSocketNewListenUNIX(path, + mask, + grp, + &svc->socks[0]) < 0) + goto error; + + for (i = 0 ; i < svc->nsocks ; i++) { + if (virNetSocketListen(svc->socks[i]) < 0) + goto error; + + /* IO callback is initially disabled, until we're ready + * to deal with incoming clients */ + if (virNetSocketAddIOCallback(svc->socks[i], + 0, + virNetServerServiceAccept, + svc) < 0) + goto error; + } + + + return svc; + +no_memory: + virReportOOMError(); +error: + virNetServerServiceFree(svc); + return NULL; +} + + +int virNetServerServiceGetAuth(virNetServerServicePtr svc) +{ + return svc->auth; +} + + +bool virNetServerServiceIsReadonly(virNetServerServicePtr svc) +{ + return svc->readonly; +} + + +void virNetServerServiceRef(virNetServerServicePtr svc) +{ + svc->refs++; +} + + +void virNetServerServiceSetDispatcher(virNetServerServicePtr svc, + virNetServerServiceDispatchFunc func, + void *opaque) +{ + svc->dispatchFunc = func; + svc->dispatchOpaque = opaque; +} + + +void virNetServerServiceFree(virNetServerServicePtr svc) +{ + int i; + + if (!svc) + return; + + svc->refs--; + if (svc->refs > 0) + return; + + for (i = 0 ; i < svc->nsocks ; i++) + virNetSocketFree(svc->socks[i]); + VIR_FREE(svc->socks); + + virNetTLSContextFree(svc->tls); + + VIR_FREE(svc); +} + +void virNetServerServiceToggle(virNetServerServicePtr svc, + bool enabled) +{ + int i; + + for (i = 0 ; i < svc->nsocks ; i++) + virNetSocketUpdateIOCallback(svc->socks[i], + enabled ? + VIR_EVENT_HANDLE_READABLE : + 0); +} diff --git a/src/rpc/virnetserverservice.h b/src/rpc/virnetserverservice.h new file mode 100644 index 0000000..b8ccd55 --- /dev/null +++ b/src/rpc/virnetserverservice.h @@ -0,0 +1,65 @@ +/* + * virnetserverservice.h: generic network RPC server service + * + * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006 Daniel P. Berrange + * + * 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(a)redhat.com&gt; + */ + +#ifndef __VIR_NET_SERVER_SERVICE_H__ +# define __VIR_NET_SERVER_SERVICE_H__ + +# include "virnetserverprogram.h" + +enum { + VIR_NET_SERVER_SERVICE_AUTH_NONE = 0, + VIR_NET_SERVER_SERVICE_AUTH_SASL, + VIR_NET_SERVER_SERVICE_AUTH_POLKIT, +}; + +typedef int (*virNetServerServiceDispatchFunc)(virNetServerServicePtr svc, + virNetServerClientPtr client, + void *opaque); + +virNetServerServicePtr virNetServerServiceNewTCP(const char *nodename, + const char *service, + int auth, + bool readonly, + virNetTLSContextPtr tls); +virNetServerServicePtr virNetServerServiceNewUNIX(const char *path, + mode_t mask, + gid_t grp, + int auth, + bool readonly, + virNetTLSContextPtr tls); + +int virNetServerServiceGetAuth(virNetServerServicePtr svc); +bool virNetServerServiceIsReadonly(virNetServerServicePtr svc); + +void virNetServerServiceRef(virNetServerServicePtr svc); + +void virNetServerServiceSetDispatcher(virNetServerServicePtr svc, + virNetServerServiceDispatchFunc func, + void *opaque); + +void virNetServerServiceFree(virNetServerServicePtr svc); + +void virNetServerServiceToggle(virNetServerServicePtr svc, + bool enabled); + +#endif -- 1.7.4.4