June 2009 - Devel - libvirt List Archives

[libvirt] PATCH: Support networking in User Mode Linux driver
by Daniel P. Berrange 03 Jun '09

03 Jun '09

This patch adds support for bridge, virtual network, multicast and user-mode networking in the User Mode Linux driver. You can't pass an open TAP device file descriptor to UML, so we also extend the bridge.c file to supporting creation & deletion of persistent TAP devices. Daniel diff --git a/src/bridge.c b/src/bridge.c --- a/src/bridge.c +++ b/src/bridge.c @@ -451,8 +451,11 @@ brProbeVnetHdr(int tapfd) * * This function creates a new tap device on a bridge. @ifname can be either * a fixed name or a name template with '%d' for dynamic name allocation. - * in either case the final name for the bridge will be stored in @ifname - * and the associated file descriptor in @tapfd. + * in either case the final name for the bridge will be stored in @ifname. + * If the @tapfd parameter is supplied, the open tap device file + * descriptor will be returned, otherwise the TAP device will be made + * persistent and closed. The caller must use brDeleteTap to remove + * a persistent TAP devices when it is no longer needed. * * Returns 0 in case of success or an errno code in case of failure. */ @@ -465,7 +468,7 @@ brAddTap(brControl *ctl, { int id, subst, fd; - if (!ctl || !ctl->fd || !bridge || !ifname || !tapfd) + if (!ctl || !ctl->fd || !bridge || !ifname) return EINVAL; subst = id = 0; @@ -520,10 +523,14 @@ brAddTap(brControl *ctl, goto error; if ((errno = brSetInterfaceUp(ctl, try.ifr_name, 1))) goto error; + if (!tapfd && + (errno = ioctl(fd, TUNSETPERSIST, 1))) + goto error; VIR_FREE(*ifname); if (!(*ifname = strdup(try.ifr_name))) goto error; - *tapfd = fd; + if (tapfd) + *tapfd = fd; return 0; } @@ -535,6 +542,43 @@ brAddTap(brControl *ctl, return errno; } + +int brDeleteTap(brControl *ctl, + const char *ifname) +{ + struct ifreq try; + int len; + int fd; + + if (!ctl || !ctl->fd || !ifname) + return EINVAL; + + if ((fd = open("/dev/net/tun", O_RDWR)) < 0) + return errno; + + memset(&try, 0, sizeof(struct ifreq)); + try.ifr_flags = IFF_TAP|IFF_NO_PI; + + len = strlen(ifname); + if (len >= BR_IFNAME_MAXLEN - 1) { + errno = EINVAL; + goto error; + } + + strncpy(try.ifr_name, ifname, len); + try.ifr_name[len] = '\0'; + + if (ioctl(fd, TUNSETIFF, &try) == 0) { + if ((errno = ioctl(fd, TUNSETPERSIST, 0))) + goto error; + } + + error: + close(fd); + + return errno; +} + /** * brSetInterfaceUp: diff --git a/src/bridge.h b/src/bridge.h --- a/src/bridge.h +++ b/src/bridge.h @@ -60,11 +60,19 @@ int brDeleteInterface (brContr const char *bridge, const char *iface); +enum { + BR_TAP_VNET_HDR = (1 << 0), + BR_TAP_PERSIST = (1 << 1), +}; + int brAddTap (brControl *ctl, const char *bridge, char **ifname, - int vnet_hdr, + int features, int *tapfd); + +int brDeleteTap (brControl *ctl, + const char *ifname); int brSetInterfaceUp (brControl *ctl, const char *ifname, diff --git a/src/domain_conf.c b/src/domain_conf.c --- a/src/domain_conf.c +++ b/src/domain_conf.c @@ -3146,6 +3146,7 @@ virDomainNetDefFormat(virConnectPtr conn else virBufferVSprintf(buf, " <source port='%d'/>\n", def->data.socket.port); + break; case VIR_DOMAIN_NET_TYPE_INTERNAL: virBufferEscapeString(buf, " <source name='%s'/>\n", diff --git a/src/libvirt_bridge.syms b/src/libvirt_bridge.syms --- a/src/libvirt_bridge.syms +++ b/src/libvirt_bridge.syms @@ -8,6 +8,7 @@ brAddBridge; brAddBridge; brAddInterface; brAddTap; +brDeleteTap; brDeleteBridge; brHasBridge; brInit; diff --git a/src/uml_conf.c b/src/uml_conf.c --- a/src/uml_conf.c +++ b/src/uml_conf.c @@ -44,6 +44,7 @@ #include "memory.h" #include "nodeinfo.h" #include "verify.h" +#include "bridge.h" #define VIR_FROM_THIS VIR_FROM_UML @@ -90,6 +91,172 @@ virCapsPtr umlCapsInit(void) { return NULL; } + +static int +umlConnectTapDevice(virConnectPtr conn, + virDomainNetDefPtr net, + const char *bridge) +{ + int tapfd = -1; + int err; + brControl *brctl = NULL; + + if (!net->ifname || + STRPREFIX(net->ifname, "vnet") || + strchr(net->ifname, '%')) { + VIR_FREE(net->ifname); + if (!(net->ifname = strdup("vnet%d"))) + goto no_memory; + } + + if ((err = brInit(&brctl))) { + char ebuf[1024]; + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, + _("cannot initialize bridge support: %s"), + virStrerror(err, ebuf, sizeof ebuf)); + goto error; + } + + if ((err = brAddTap(brctl, bridge, + &net->ifname, BR_TAP_PERSIST, &tapfd))) { + if (errno == ENOTSUP) { + /* In this particular case, give a better diagnostic. */ + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, + _("Failed to add tap interface to bridge. " + "%s is not a bridge device"), bridge); + } else { + char ebuf[1024]; + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, + _("Failed to add tap interface '%s' " + "to bridge '%s' : %s"), + net->ifname, bridge, virStrerror(err, ebuf, sizeof ebuf)); + } + goto error; + } + close(tapfd); + + brShutdown(brctl); + + return 0; + +no_memory: + virReportOOMError(conn); +error: + brShutdown(brctl); + return -1; +} + +static char * +umlBuildCommandLineNet(virConnectPtr conn, + virDomainNetDefPtr def, + int idx) +{ + char *ret; + virBuffer buf = VIR_BUFFER_INITIALIZER; + + /* General format: ethNN=type,options */ + + virBufferVSprintf(&buf, "eth%d=", idx); + + switch (def->type) { + case VIR_DOMAIN_NET_TYPE_USER: + /* ethNNN=slirp,macaddr */ + virBufferAddLit(&buf, "slirp"); + break; + + case VIR_DOMAIN_NET_TYPE_ETHERNET: + /* ethNNN=tuntap,tapname,macaddr,gateway */ + virBufferAddLit(&buf, "tuntap"); + if (def->data.ethernet.ipaddr) { + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s", + _("IP address not supported for ethernet inteface")); + goto error; + } + if (def->data.ethernet.script) { + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s", + _("script execution not supported for ethernet inteface")); + goto error; + } + break; + + case VIR_DOMAIN_NET_TYPE_SERVER: + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s", + _("TCP server networking type not supported")); + goto error; + + case VIR_DOMAIN_NET_TYPE_CLIENT: + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s", + _("TCP client networking type not supported")); + goto error; + + case VIR_DOMAIN_NET_TYPE_MCAST: + /* ethNNN=tuntap,macaddr,ipaddr,port */ + virBufferAddLit(&buf, "mcast"); + break; + + case VIR_DOMAIN_NET_TYPE_NETWORK: + { + char *bridge; + virNetworkPtr network = virNetworkLookupByName(conn, + def->data.network.name); + if (!network) { + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, + _("Network '%s' not found"), + def->data.network.name); + goto error; + } + bridge = virNetworkGetBridgeName(network); + virNetworkFree(network); + if (bridge == NULL) { + goto error; + } + + if (umlConnectTapDevice(conn, def, bridge) < 0) { + VIR_FREE(bridge); + goto error; + } + + /* ethNNN=tuntap,tapname,macaddr,gateway */ + virBufferVSprintf(&buf, "tuntap,%s", def->ifname); + break; + } + + case VIR_DOMAIN_NET_TYPE_BRIDGE: + if (umlConnectTapDevice(conn, def, def->data.bridge.brname) < 0) + goto error; + + /* ethNNN=tuntap,tapname,macaddr,gateway */ + virBufferVSprintf(&buf, "tuntap,%s", def->ifname); + break; + + case VIR_DOMAIN_NET_TYPE_INTERNAL: + umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, "%s", + _("internal networking type not supported")); + goto error; + } + + virBufferVSprintf(&buf, ",%02x:%02x:%02x:%02x:%02x:%02x", + def->mac[0], def->mac[1], def->mac[2], + def->mac[3], def->mac[4], def->mac[5]); + + if (def->type == VIR_DOMAIN_NET_TYPE_MCAST) { + virBufferVSprintf(&buf, ",%s,%d", + def->data.socket.address, + def->data.socket.port); + } + + if (virBufferError(&buf)) { + virReportOOMError(conn); + return NULL; + } + + return virBufferContentAndReset(&buf); + +error: + ret = virBufferContentAndReset(&buf); + VIR_FREE(ret); + return NULL; +} static char * umlBuildCommandLineChr(virConnectPtr conn, @@ -166,9 +333,8 @@ int umlBuildCommandLine(virConnectPtr co struct uml_driver *driver ATTRIBUTE_UNUSED, virDomainObjPtr vm, const char ***retargv, - const char ***retenv, - int **tapfds, - int *ntapfds) { + const char ***retenv) +{ int i, j; char memory[50]; struct utsname ut; @@ -277,6 +443,13 @@ int umlBuildCommandLine(virConnectPtr co ADD_ARG_PAIR(disk->dst, disk->src); } + for (i = 0 ; i < vm->def->nnets ; i++) { + char *ret = umlBuildCommandLineNet(conn, vm->def->nets[i], i); + if (!ret) + goto error; + ADD_ARG(ret); + } + for (i = 0 ; i < UML_MAX_CHAR_DEVICE ; i++) { char *ret; if (i == 0 && vm->def->console) @@ -311,13 +484,7 @@ int umlBuildCommandLine(virConnectPtr co no_memory: virReportOOMError(conn); error: - if (tapfds && - *tapfds) { - for (i = 0; i < *ntapfds; i++) - close((*tapfds)[i]); - VIR_FREE(*tapfds); - *ntapfds = 0; - } + if (qargv) { for (i = 0 ; i < qargc ; i++) VIR_FREE((qargv)[i]); diff --git a/src/uml_conf.h b/src/uml_conf.h --- a/src/uml_conf.h +++ b/src/uml_conf.h @@ -70,8 +70,6 @@ int umlBuildCommandLine (v struct uml_driver *driver, virDomainObjPtr dom, const char ***retargv, - const char ***retenv, - int **tapfds, - int *ntapfds); + const char ***retenv); #endif /* __UML_CONF_H */ diff --git a/src/uml_driver.c b/src/uml_driver.c --- a/src/uml_driver.c +++ b/src/uml_driver.c @@ -715,6 +721,35 @@ error: return -1; } + +static int umlCleanupTapDevices(virConnectPtr conn ATTRIBUTE_UNUSED, + virDomainObjPtr vm) { + int i; + int err; + int ret = 0; + brControl *brctl = NULL; + VIR_ERROR0("Cleanup tap"); + if (brInit(&brctl) < 0) + return -1; + + for (i = 0 ; i < vm->def->nnets ; i++) { + virDomainNetDefPtr def = vm->def->nets[i]; + + if (def->type != VIR_DOMAIN_NET_TYPE_BRIDGE && + def->type != VIR_DOMAIN_NET_TYPE_NETWORK) + continue; + + VIR_ERROR("Cleanup '%s'", def->ifname); + err = brDeleteTap(brctl, def->ifname); + if (err) { + VIR_ERROR("Cleanup failed %d", err); + ret = -1; + } + } + VIR_ERROR0("Cleanup tap done"); + brShutdown(brctl); + return ret; +} static int umlStartVMDaemon(virConnectPtr conn, struct uml_driver *driver, @@ -726,8 +761,6 @@ static int umlStartVMDaemon(virConnectPt char *logfile; int logfd = -1; struct stat sb; - int *tapfds = NULL; - int ntapfds = 0; fd_set keepfd; char ebuf[1024]; @@ -786,9 +819,9 @@ static int umlStartVMDaemon(virConnectPt } if (umlBuildCommandLine(conn, driver, vm, - &argv, &progenv, - &tapfds, &ntapfds) < 0) { + &argv, &progenv) < 0) { close(logfd); + umlCleanupTapDevices(conn, vm); return -1; } @@ -818,9 +851,6 @@ static int umlStartVMDaemon(virConnectPt vm->monitor = -1; - for (i = 0 ; i < ntapfds ; i++) - FD_SET(tapfds[i], &keepfd); - ret = virExecDaemonize(conn, argv, progenv, &keepfd, &pid, -1, &logfd, &logfd, 0, NULL, NULL, NULL); @@ -834,15 +864,14 @@ static int umlStartVMDaemon(virConnectPt VIR_FREE(progenv[i]); VIR_FREE(progenv); - if (tapfds) { - for (i = 0 ; i < ntapfds ; i++) { - close(tapfds[i]); - } - VIR_FREE(tapfds); - } + if (ret < 0) + umlCleanupTapDevices(conn, vm); /* NB we don't mark it running here - we do that async with inotify */ + /* XXX what if someone else tries to start it again + before we get the inotification ? Sounds like + trouble.... */ return ret; } @@ -874,6 +901,8 @@ static void umlShutdownVMDaemon(virConne vm->state = VIR_DOMAIN_SHUTOFF; VIR_FREE(vm->vcpupids); vm->nvcpupids = 0; + + umlCleanupTapDevices(conn, vm); if (vm->newDef) { virDomainDefFree(vm->def); -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 1

[libvirt] PATCH: Misc user mode linux startup bugs
by Daniel P. Berrange 03 Jun '09

03 Jun '09

There's a number of annoying bugs in the user mode linux driver startup code. This patch fixes lots of them. We failed to check umlMonitorCommand for error, leading to a NULL de-reference due to another bug in that function. This patch also checks if 'res' is NULL before de-referenceing it, just in case. In the code for handling inotify delete events, we duplicated alot of the umlShutdownVMDaemon code, but forgot to close the monitor. This patches makes it just call umlShutdownVMDaemon directly. In one place where we spin in a usleep loop, we forgot to increment our retries counter, making it spin forever. Finally, switch to virKillProcess and make the latter also avoids pid==1, since I can't imagine a time where we'd ever want to kill 'init' :-) Daniel diff --git a/src/uml_driver.c b/src/uml_driver.c --- a/src/uml_driver.c +++ b/src/uml_driver.c @@ -166,9 +166,10 @@ umlIdentifyOneChrPTY(virConnectPtr conn, return -1; } requery: - umlMonitorCommand(NULL, driver, dom, cmd, &res); + if (umlMonitorCommand(NULL, driver, dom, cmd, &res) < 0) + return -1; - if (STRPREFIX(res, "pts:")) { + if (res && STRPREFIX(res, "pts:")) { VIR_FREE(def->data.file.path); if ((def->data.file.path = strdup(res + 4)) == NULL) { virReportOOMError(conn); @@ -176,7 +177,7 @@ requery: VIR_FREE(cmd); return -1; } - } else if (STRPREFIX(res, "pts")) { + } else if (!res || STRPREFIX(res, "pts")) { /* It can take a while to startup, so retry for upto 5 seconds */ /* XXX should do this in a better non-blocking @@ -263,19 +264,15 @@ reread: } if (e->mask & IN_DELETE) { + VIR_DEBUG("Got inotify domain shutdown '%s'", name); if (!virDomainIsActive(dom)) { virDomainObjUnlock(dom); continue; } - dom->def->id = -1; - dom->pid = -1; - if (dom->newDef) { - virDomainDefFree(dom->def); - dom->def = dom->newDef; - } - dom->state = VIR_DOMAIN_SHUTOFF; + umlShutdownVMDaemon(NULL, driver, dom); } else if (e->mask & (IN_CREATE | IN_MODIFY)) { + VIR_DEBUG("Got inotify domain startup '%s'", name); if (virDomainIsActive(dom)) { virDomainObjUnlock(dom); continue; @@ -289,11 +286,13 @@ reread: dom->def->id = driver->nextvmid++; dom->state = VIR_DOMAIN_RUNNING; - if (umlOpenMonitor(NULL, driver, dom) < 0) + if (umlOpenMonitor(NULL, driver, dom) < 0) { + VIR_WARN0("Could not open monitor for new domain"); umlShutdownVMDaemon(NULL, driver, dom); - - if (umlIdentifyChrPTY(NULL, driver, dom) < 0) + } else if (umlIdentifyChrPTY(NULL, driver, dom) < 0) { + VIR_WARN0("Could not identify charater devices for new domain"); umlShutdownVMDaemon(NULL, driver, dom); + } } virDomainObjUnlock(dom); } @@ -383,6 +382,7 @@ umlStartup(void) { goto error; } + VIR_INFO("Adding inotify watch on %s", uml_driver->monitorDir); if (inotify_add_watch(uml_driver->inotifyFD, uml_driver->monitorDir, IN_CREATE | IN_MODIFY | IN_DELETE) < 0) { @@ -595,10 +595,11 @@ static int umlOpenMonitor(virConnectPtr if (umlMonitorAddress(conn, driver, vm, &addr) < 0) return -1; + VIR_DEBUG("Dest address for monitor is '%s'", addr.sun_path); restat: if (stat(addr.sun_path, &sb) < 0) { if (errno == ENOENT && - retries < 50) { + retries++ < 50) { usleep(1000 * 100); goto restat; } @@ -612,7 +613,8 @@ restat: } memset(addr.sun_path, 0, sizeof addr.sun_path); - sprintf(addr.sun_path + 1, "%u", getpid()); + sprintf(addr.sun_path + 1, "libvirt-uml-%u", vm->pid); + VIR_DEBUG("Reply address for monitor is '%s'", addr.sun_path+1); if (bind(vm->monitor, (struct sockaddr *)&addr, sizeof addr) < 0) { virReportSystemError(conn, errno, "%s", _("cannot bind socket")); @@ -656,6 +658,8 @@ static int umlMonitorCommand(virConnectP int retlen = 0, ret = 0; struct sockaddr_un addr; unsigned int addrlen; + + VIR_DEBUG("Run command '%s'", cmd); *reply = NULL; @@ -706,6 +710,8 @@ static int umlMonitorCommand(virConnectP } while (res.extra); + VIR_DEBUG("Command reply is '%s'", NULLSTR(retdata)); + *reply = retdata; return ret; @@ -852,12 +881,10 @@ static void umlShutdownVMDaemon(virConne virDomainObjPtr vm) { int ret; - if (!virDomainIsActive(vm) || - vm->pid <= 1) + if (!virDomainIsActive(vm)) return; - - kill(vm->pid, SIGTERM); + virKillProcess(vm->pid, SIGTERM); if (vm->monitor != -1) close(vm->monitor); diff --git a/src/util.c b/src/util.c --- a/src/util.c +++ b/src/util.c @@ -1680,7 +1680,7 @@ char *virGetHostname(void) /* send signal to a single process */ int virKillProcess(pid_t pid, int sig) { - if (pid < 1) { + if (pid <= 1) { errno = ESRCH; return -1; } -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 1

[libvirt] PATCH: Fix libvirt log initialization to not override environment
by Daniel P. Berrange 03 Jun '09

03 Jun '09

Witht he libvirtd daemon, if you start it up with LIBVIRT_LOG_OUTPUTS or LIBVIRT_LOG_FILTERS set, then it'll initially use these settings for logging, but then when it reads the config file it'll reset all logging and ignore your environment variables. This is rather confusing ! This quick fix makes it honour this env variables, if the config file has not got explicit overrides. Daniel diff --git a/qemud/qemud.c b/qemud/qemud.c --- a/qemud/qemud.c +++ b/qemud/qemud.c @@ -2482,6 +2482,11 @@ qemudSetLogging(virConfPtr conf, const c /* there is no default filters */ GET_CONF_STR (conf, filename, log_filters); + if (!log_filters) { + debugEnv = getenv("LIBVIRT_LOG_FILTERS"); + if (debugEnv) + log_filters = strdup(debugEnv); + } virLogParseFilters(log_filters); /* @@ -2489,7 +2494,12 @@ qemudSetLogging(virConfPtr conf, const c * all logs to stderr if not running as daemon */ GET_CONF_STR (conf, filename, log_outputs); - if (log_outputs == NULL) { + if (!log_outputs) { + debugEnv = getenv("LIBVIRT_LOG_OUTPUTS"); + if (debugEnv) + log_outputs = strdup(debugEnv); + } + if (!log_outputs) { if (godaemon) { char *tmp = NULL; if (virAsprintf (&tmp, "%d:syslog:libvirtd", log_level) < 0) @@ -2499,8 +2509,9 @@ qemudSetLogging(virConfPtr conf, const c } else { virLogParseOutputs("0:stderr:libvirtd"); } - } else + } else { virLogParseOutputs(log_outputs); + } ret = 0; free_and_fail: -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 1

[libvirt] [PATCH 0/1] NPIV support revised patch
by David Allan 03 Jun '09

03 Jun '09

Here is a new version of the NPIV support incorporating everybody's comments. I think it should be ready to go in at this point. Dave

3 3

[libvirt] PATCH: Remove all getuid==0 checks from code
by Daniel P. Berrange 02 Jun '09

02 Jun '09

This patch is preparing the way for future work on allowing the libvirtd daemon to run as a less-privileged user ID. The idea is that we will switch from 'root' to 'libvirtd', but use Linux capabilties to keep the handful of higher privileges we need for our work. Thus any code which does a check of 'getuid() == 0' is guarenteed to break [1]. The way this patch approaches this problem, is to change the driver initialization function virStateInitialize() to have it be passed in a 'int privileged' flag from the libvirtd daemon. Each driver is updated to record this flag, and use it for checks where needed. The only real exception is the Xen driver, where we simply check access(2) against the file we need to open. [1] Technically this is already broken on Solaris, since they already change user id qemud/qemud.c | 39 ++++++++++++++++++++++----------------- qemud/qemud.h | 2 ++ src/driver.h | 2 +- src/libvirt.c | 4 ++-- src/libvirt_internal.h | 2 +- src/lxc_driver.c | 25 +++---------------------- src/network_driver.c | 4 ++-- src/node_device_devkit.c | 2 +- src/node_device_hal.c | 2 +- src/qemu_conf.h | 2 ++ src/qemu_driver.c | 37 +++++++++++++++++++------------------ src/remote_internal.c | 2 +- src/storage_driver.c | 6 +++--- src/uml_conf.h | 2 ++ src/uml_driver.c | 18 +++++++++--------- src/xen_internal.c | 2 +- src/xen_unified.c | 2 +- 17 files changed, 73 insertions(+), 80 deletions(-) Daniel diff -r 5e3b5d1f91c2 qemud/qemud.c --- a/qemud/qemud.c Thu May 21 16:21:20 2009 +0100 +++ b/qemud/qemud.c Thu May 21 16:27:16 2009 +0100 @@ -112,8 +112,6 @@ static int unix_sock_ro_mask = 0666; #else -#define SYSTEM_UID 0 - static gid_t unix_sock_gid = 0; /* Only root by default */ static int unix_sock_rw_mask = 0700; /* Allow user only */ static int unix_sock_ro_mask = 0777; /* Allow world */ @@ -512,7 +510,7 @@ static int qemudListenUnix(struct qemud_ oldgrp = getgid(); oldmask = umask(readonly ? ~unix_sock_ro_mask : ~unix_sock_rw_mask); - if (getuid() == 0) + if (server->privileged) setgid(unix_sock_gid); if (bind(sock->fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { @@ -521,7 +519,7 @@ static int qemudListenUnix(struct qemud_ goto cleanup; } umask(oldmask); - if (getuid() == 0) + if (server->privileged) setgid(oldgrp); if (listen(sock->fd, 30) < 0) { @@ -696,7 +694,6 @@ static int qemudInitPaths(struct qemud_s char *roSockname, int maxlen) { - uid_t uid = geteuid(); char *sock_dir; char *dir_prefix = NULL; int ret = -1; @@ -706,7 +703,7 @@ static int qemudInitPaths(struct qemud_s sock_dir = unix_sock_dir; else { sock_dir = sockname; - if (uid == SYSTEM_UID) { + if (server->privileged) { dir_prefix = strdup (LOCAL_STATE_DIR); if (dir_prefix == NULL) { virReportOOMError(NULL); @@ -716,6 +713,7 @@ static int qemudInitPaths(struct qemud_s dir_prefix) >= maxlen) goto snprintf_error; } else { + uid_t uid = geteuid(); dir_prefix = virGetUserDirectory(NULL, uid); if (dir_prefix == NULL) { /* Do not diagnose here; virGetUserDirectory does that. */ @@ -733,7 +731,7 @@ static int qemudInitPaths(struct qemud_s goto cleanup; } - if (uid == SYSTEM_UID) { + if (server->privileged) { if (snprintf (sockname, maxlen, "%s/libvirt-sock", sock_dir_prefix) >= maxlen || (snprintf (roSockname, maxlen, "%s/libvirt-sock-ro", @@ -747,10 +745,10 @@ static int qemudInitPaths(struct qemud_s goto snprintf_error; } - if (uid == SYSTEM_UID) - server->logDir = strdup (LOCAL_STATE_DIR "/log/libvirt"); + if (server->privileged) + server->logDir = strdup (LOCAL_STATE_DIR "/log/libvirt"); else - virAsprintf(&server->logDir, "%s/.libvirt/log", dir_prefix); + virAsprintf(&server->logDir, "%s/.libvirt/log", dir_prefix); if (server->logDir == NULL) virReportOOMError(NULL); @@ -786,6 +784,7 @@ static struct qemud_server *qemudInitial VIR_FREE(server); } + server->privileged = getuid() == 0 ? 1 : 0; server->sigread = sigread; if (virEventInit() < 0) { @@ -844,7 +843,7 @@ static struct qemud_server *qemudInitial virEventUpdateTimeoutImpl, virEventRemoveTimeoutImpl); - virStateInitialize(); + virStateInitialize(server->privileged); return server; } @@ -915,7 +914,7 @@ static struct qemud_server *qemudNetwork } #ifdef HAVE_AVAHI - if (getuid() == 0 && mdns_adv) { + if (server->privileged && mdns_adv) { struct libvirtd_mdns_group *group; int port = 0; @@ -2507,9 +2506,9 @@ remoteReadConfigFile (struct qemud_serve #if HAVE_POLKIT /* Change the default back to no auth for non-root */ - if (getuid() != 0 && auth_unix_rw == REMOTE_AUTH_POLKIT) + if (!server->privileged && auth_unix_rw == REMOTE_AUTH_POLKIT) auth_unix_rw = REMOTE_AUTH_NONE; - if (getuid() != 0 && auth_unix_ro == REMOTE_AUTH_POLKIT) + if (!server->privileged && auth_unix_ro == REMOTE_AUTH_POLKIT) auth_unix_ro = REMOTE_AUTH_NONE; #endif @@ -2546,7 +2545,7 @@ remoteReadConfigFile (struct qemud_serve GET_CONF_STR (conf, filename, unix_sock_group); if (unix_sock_group) { - if (getuid() != 0) { + if (!server->privileged) { VIR_WARN0(_("Cannot set group when not running as root")); } else { int ret; @@ -2871,7 +2870,7 @@ int main(int argc, char **argv) { sigaction(SIGPIPE, &sig_action, NULL); /* Ensure the rundir exists (on tmpfs on some systems) */ - if (geteuid () == 0) { + if (getuid() == 0) { const char *rundir = LOCAL_STATE_DIR "/run/libvirt"; if (mkdir (rundir, 0755)) { @@ -2882,6 +2881,12 @@ int main(int argc, char **argv) { } } + /* Beyond this point, nothing should rely on using + * getuid/geteuid() == 0, for privilege level checks. + * It must all use the flag 'server->privileged' + * which is also passed into all libvirt stateful + * drivers + */ if (qemudSetupPrivs() < 0) goto error2; @@ -2895,7 +2900,7 @@ int main(int argc, char **argv) { goto error2; /* Change the group ownership of /var/run/libvirt to unix_sock_gid */ - if (unix_sock_dir && geteuid() == 0) { + if (unix_sock_dir && server->privileged) { if (chown(unix_sock_dir, -1, unix_sock_gid) < 0) VIR_ERROR(_("Failed to change group ownership of %s"), unix_sock_dir); diff -r 5e3b5d1f91c2 qemud/qemud.h --- a/qemud/qemud.h Thu May 21 16:21:20 2009 +0100 +++ b/qemud/qemud.h Thu May 21 16:27:16 2009 +0100 @@ -172,6 +172,8 @@ struct qemud_server { virMutex lock; virCond job; + int privileged; + int nworkers; int nactiveworkers; struct qemud_worker *workers; diff -r 5e3b5d1f91c2 src/driver.h --- a/src/driver.h Thu May 21 16:21:20 2009 +0100 +++ b/src/driver.h Thu May 21 16:27:16 2009 +0100 @@ -717,7 +717,7 @@ struct _virStorageDriver { }; #ifdef WITH_LIBVIRTD -typedef int (*virDrvStateInitialize) (void); +typedef int (*virDrvStateInitialize) (int privileged); typedef int (*virDrvStateCleanup) (void); typedef int (*virDrvStateReload) (void); typedef int (*virDrvStateActive) (void); diff -r 5e3b5d1f91c2 src/libvirt.c --- a/src/libvirt.c Thu May 21 16:21:20 2009 +0100 +++ b/src/libvirt.c Thu May 21 16:27:16 2009 +0100 @@ -765,7 +765,7 @@ virRegisterStateDriver(virStateDriverPtr * * Return 0 if all succeed, -1 upon any failure. */ -int virStateInitialize(void) { +int virStateInitialize(int privileged) { int i, ret = 0; if (virInitialize() < 0) @@ -773,7 +773,7 @@ int virStateInitialize(void) { for (i = 0 ; i < virStateDriverTabCount ; i++) { if (virStateDriverTab[i]->initialize && - virStateDriverTab[i]->initialize() < 0) + virStateDriverTab[i]->initialize(privileged) < 0) ret = -1; } return ret; diff -r 5e3b5d1f91c2 src/libvirt_internal.h --- a/src/libvirt_internal.h Thu May 21 16:21:20 2009 +0100 +++ b/src/libvirt_internal.h Thu May 21 16:27:16 2009 +0100 @@ -26,7 +26,7 @@ #ifdef WITH_LIBVIRTD -int virStateInitialize(void); +int virStateInitialize(int privileged); int virStateCleanup(void); int virStateReload(void); int virStateActive(void); diff -r 5e3b5d1f91c2 src/lxc_driver.c --- a/src/lxc_driver.c Thu May 21 16:21:20 2009 +0100 +++ b/src/lxc_driver.c Thu May 21 16:27:16 2009 +0100 @@ -51,7 +51,7 @@ #define VIR_FROM_THIS VIR_FROM_LXC -static int lxcStartup(void); +static int lxcStartup(int privileged); static int lxcShutdown(void); static lxc_driver_t *lxc_driver = NULL; @@ -67,15 +67,6 @@ static void lxcDriverUnlock(lxc_driver_t } -static int lxcProbe(void) -{ - if (getuid() != 0 || - lxcContainerAvailable(0) < 0) - return 0; - - return 1; -} - static virDrvOpenStatus lxcOpen(virConnectPtr conn, virConnectAuthPtr auth ATTRIBUTE_UNUSED, int flags ATTRIBUTE_UNUSED) @@ -86,9 +77,6 @@ static virDrvOpenStatus lxcOpen(virConne if (lxc_driver == NULL) return VIR_DRV_OPEN_DECLINED; - if (!lxcProbe()) - return VIR_DRV_OPEN_DECLINED; - conn->uri = xmlParseURI("lxc:///"); if (!conn->uri) { virReportOOMError(conn); @@ -115,12 +103,6 @@ static virDrvOpenStatus lxcOpen(virConne _("lxc state driver is not active")); return VIR_DRV_OPEN_ERROR; } - - if (!lxcProbe()) { - lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR, - _("kernel does not support LXC feature")); - return VIR_DRV_OPEN_ERROR; - } } conn->privateData = lxc_driver; @@ -1149,9 +1131,8 @@ static int lxcCheckNetNsSupport(void) return 1; } -static int lxcStartup(void) +static int lxcStartup(int privileged) { - uid_t uid = getuid(); unsigned int i; char *ld; @@ -1164,7 +1145,7 @@ static int lxcStartup(void) return -1; /* Check that the user is root */ - if (0 != uid) { + if (!privileged) { return -1; } diff -r 5e3b5d1f91c2 src/network_driver.c --- a/src/network_driver.c Thu May 21 16:21:20 2009 +0100 +++ b/src/network_driver.c Thu May 21 16:27:16 2009 +0100 @@ -182,7 +182,7 @@ networkAutostartConfigs(struct network_d * Initialization function for the QEmu daemon */ static int -networkStartup(void) { +networkStartup(int privileged) { uid_t uid = geteuid(); char *base = NULL; int err; @@ -196,7 +196,7 @@ networkStartup(void) { } networkDriverLock(driverState); - if (!uid) { + if (privileged) { if (virAsprintf(&driverState->logDir, "%s/log/libvirt/qemu", LOCAL_STATE_DIR) == -1) goto out_of_memory; diff -r 5e3b5d1f91c2 src/node_device_devkit.c --- a/src/node_device_devkit.c Thu May 21 16:21:20 2009 +0100 +++ b/src/node_device_devkit.c Thu May 21 16:27:16 2009 +0100 @@ -284,7 +284,7 @@ static void dev_create(void *_dkdev, voi } -static int devkitDeviceMonitorStartup(void) +static int devkitDeviceMonitorStartup(int privileged ATTRIBUTE_UNUSED) { size_t caps_tbl_len = sizeof(caps_tbl) / sizeof(caps_tbl[0]); DevkitClient *devkit_client = NULL; diff -r 5e3b5d1f91c2 src/node_device_hal.c --- a/src/node_device_hal.c Thu May 21 16:21:20 2009 +0100 +++ b/src/node_device_hal.c Thu May 21 16:27:16 2009 +0100 @@ -661,7 +661,7 @@ static void toggle_dbus_watch(DBusWatch } -static int halDeviceMonitorStartup(void) +static int halDeviceMonitorStartup(int privileged ATTRIBUTE_UNUSED) { LibHalContext *hal_ctx = NULL; DBusConnection *dbus_conn = NULL; diff -r 5e3b5d1f91c2 src/qemu_conf.h --- a/src/qemu_conf.h Thu May 21 16:21:20 2009 +0100 +++ b/src/qemu_conf.h Thu May 21 16:27:16 2009 +0100 @@ -62,6 +62,8 @@ enum qemud_cmd_flags { struct qemud_driver { virMutex lock; + int privileged; + unsigned int qemuVersion; int nextvmid; diff -r 5e3b5d1f91c2 src/qemu_driver.c --- a/src/qemu_driver.c Thu May 21 16:21:20 2009 +0100 +++ b/src/qemu_driver.c Thu May 21 16:27:16 2009 +0100 @@ -130,24 +130,26 @@ static struct qemud_driver *qemu_driver static int -qemudLogFD(virConnectPtr conn, const char* logDir, const char* name) +qemudLogFD(virConnectPtr conn, struct qemud_driver *driver, const char* name) { char logfile[PATH_MAX]; mode_t logmode; - uid_t uid = geteuid(); int ret, fd = -1; - if ((ret = snprintf(logfile, sizeof(logfile), "%s/%s.log", logDir, name)) + if ((ret = snprintf(logfile, sizeof(logfile), "%s/%s.log", + driver->logDir, name)) < 0 || ret >= sizeof(logfile)) { virReportOOMError(conn); return -1; } logmode = O_CREAT | O_WRONLY; - if (uid != 0) + /* Only logrotate files in /var/log, so only append if running privileged */ + if (driver->privileged) + logmode |= O_APPEND; + else logmode |= O_TRUNC; - else - logmode |= O_APPEND; + if ((fd = open(logfile, logmode, S_IRUSR | S_IWUSR)) < 0) { virReportSystemError(conn, errno, _("failed to create logfile %s"), @@ -210,9 +212,9 @@ qemudAutostartConfigs(struct qemud_drive * to lookup the bridge associated with a virtual * network */ - virConnectPtr conn = virConnectOpen(getuid() ? - "qemu:///session" : - "qemu:///system"); + virConnectPtr conn = virConnectOpen(driver->privileged ? + "qemu:///system" : + "qemu:///session"); /* Ignoring NULL conn which is mostly harmless here */ qemuDriverLock(driver); @@ -333,7 +335,7 @@ qemudReconnectVMs(struct qemud_driver *d goto next_error; } - if ((vm->logfile = qemudLogFD(NULL, driver->logDir, vm->def->name)) < 0) + if ((vm->logfile = qemudLogFD(NULL, driver, vm->def->name)) < 0) goto next_error; if (vm->def->id >= driver->nextvmid) @@ -420,8 +422,7 @@ qemudSecurityInit(struct qemud_driver *q * Initialization function for the QEmu daemon */ static int -qemudStartup(void) { - uid_t uid = geteuid(); +qemudStartup(int privileged) { char *base = NULL; char driverConf[PATH_MAX]; @@ -434,6 +435,7 @@ qemudStartup(void) { return -1; } qemuDriverLock(qemu_driver); + qemu_driver->privileged = privileged; /* Don't have a dom0 so start from 1 */ qemu_driver->nextvmid = 1; @@ -448,7 +450,7 @@ qemudStartup(void) { virEventAddTimeout(-1, qemuDomainEventFlush, qemu_driver, NULL)) < 0) goto error; - if (!uid) { + if (privileged) { if (virAsprintf(&qemu_driver->logDir, "%s/log/libvirt/qemu", LOCAL_STATE_DIR) == -1) goto out_of_memory; @@ -460,6 +462,7 @@ qemudStartup(void) { "%s/run/libvirt/qemu/", LOCAL_STATE_DIR) == -1) goto out_of_memory; } else { + uid_t uid = geteuid(); char *userdir = virGetUserDirectory(NULL, uid); if (!userdir) goto error; @@ -1372,7 +1375,7 @@ static int qemudStartVMDaemon(virConnect goto cleanup; } - if((vm->logfile = qemudLogFD(conn, driver->logDir, vm->def->name)) < 0) + if ((vm->logfile = qemudLogFD(conn, driver, vm->def->name)) < 0) goto cleanup; emulator = vm->def->emulator; @@ -1773,8 +1776,6 @@ static int qemudProbe(void) static virDrvOpenStatus qemudOpen(virConnectPtr conn, virConnectAuthPtr auth ATTRIBUTE_UNUSED, int flags ATTRIBUTE_UNUSED) { - uid_t uid = getuid(); - if (conn->uri == NULL) { if (qemu_driver == NULL) return VIR_DRV_OPEN_DECLINED; @@ -1782,7 +1783,7 @@ static virDrvOpenStatus qemudOpen(virCon if (!qemudProbe()) return VIR_DRV_OPEN_DECLINED; - conn->uri = xmlParseURI(uid == 0 ? + conn->uri = xmlParseURI(qemu_driver->privileged ? "qemu:///system" : "qemu:///session"); if (!conn->uri) { @@ -1805,7 +1806,7 @@ static virDrvOpenStatus qemudOpen(virCon return VIR_DRV_OPEN_ERROR; } - if (!uid) { + if (qemu_driver->privileged) { if (STRNEQ (conn->uri->path, "/system") && STRNEQ (conn->uri->path, "/session")) { qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, diff -r 5e3b5d1f91c2 src/remote_internal.c --- a/src/remote_internal.c Thu May 21 16:21:20 2009 +0100 +++ b/src/remote_internal.c Thu May 21 16:27:16 2009 +0100 @@ -235,7 +235,7 @@ static gnutls_session_t negotiate_gnutls #ifdef WITH_LIBVIRTD static int -remoteStartup(void) +remoteStartup(int privileged ATTRIBUTE_UNUSED) { /* Mark that we're inside the daemon so we can avoid * re-entering ourselves diff -r 5e3b5d1f91c2 src/storage_driver.c --- a/src/storage_driver.c Thu May 21 16:21:20 2009 +0100 +++ b/src/storage_driver.c Thu May 21 16:27:16 2009 +0100 @@ -106,8 +106,7 @@ storageDriverAutostart(virStorageDriverS * Initialization function for the QEmu daemon */ static int -storageDriverStartup(void) { - uid_t uid = geteuid(); +storageDriverStartup(int privileged) { char *base = NULL; char driverConf[PATH_MAX]; @@ -120,10 +119,11 @@ storageDriverStartup(void) { } storageDriverLock(driverState); - if (!uid) { + if (privileged) { if ((base = strdup (SYSCONF_DIR "/libvirt")) == NULL) goto out_of_memory; } else { + uid_t uid = geteuid(); char *userdir = virGetUserDirectory(NULL, uid); if (!userdir) diff -r 5e3b5d1f91c2 src/uml_conf.h --- a/src/uml_conf.h Thu May 21 16:21:20 2009 +0100 +++ b/src/uml_conf.h Thu May 21 16:27:16 2009 +0100 @@ -42,6 +42,8 @@ struct uml_driver { virMutex lock; + int privileged; + unsigned int umlVersion; int nextvmid; diff -r 5e3b5d1f91c2 src/uml_driver.c --- a/src/uml_driver.c Thu May 21 16:21:20 2009 +0100 +++ b/src/uml_driver.c Thu May 21 16:27:16 2009 +0100 @@ -131,9 +131,9 @@ umlAutostartConfigs(struct uml_driver *d * to lookup the bridge associated with a virtual * network */ - virConnectPtr conn = virConnectOpen(getuid() ? - "uml:///session" : - "uml:///system"); + virConnectPtr conn = virConnectOpen(driver->privileged ? + "uml:///system" : + "uml:///session"); /* Ignoring NULL conn which is mostly harmless here */ for (i = 0 ; i < driver->domains.count ; i++) { @@ -308,7 +308,7 @@ cleanup: * Initialization function for the Uml daemon */ static int -umlStartup(void) { +umlStartup(int privileged) { uid_t uid = geteuid(); char *base = NULL; char driverConf[PATH_MAX]; @@ -317,6 +317,8 @@ umlStartup(void) { if (VIR_ALLOC(uml_driver) < 0) return -1; + uml_driver->privileged = privileged; + if (virMutexInit(&uml_driver->lock) < 0) { VIR_FREE(uml_driver); return -1; @@ -331,7 +333,7 @@ umlStartup(void) { if (!userdir) goto error; - if (!uid) { + if (privileged) { if (virAsprintf(&uml_driver->logDir, "%s/log/libvirt/uml", LOCAL_STATE_DIR) == -1) goto out_of_memory; @@ -887,13 +889,11 @@ static void umlShutdownVMDaemon(virConne static virDrvOpenStatus umlOpen(virConnectPtr conn, virConnectAuthPtr auth ATTRIBUTE_UNUSED, int flags ATTRIBUTE_UNUSED) { - uid_t uid = getuid(); - if (conn->uri == NULL) { if (uml_driver == NULL) return VIR_DRV_OPEN_DECLINED; - conn->uri = xmlParseURI(uid == 0 ? + conn->uri = xmlParseURI(uml_driver->privileged ? "uml:///system" : "uml:///session"); if (!conn->uri) { @@ -915,7 +915,7 @@ static virDrvOpenStatus umlOpen(virConne return VIR_DRV_OPEN_ERROR; } - if (uid == 0) { + if (uml_driver->privileged) { if (STRNEQ (conn->uri->path, "/system") && STRNEQ (conn->uri->path, "/session")) { umlReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR, diff -r 5e3b5d1f91c2 src/xen_internal.c --- a/src/xen_internal.c Thu May 21 16:21:20 2009 +0100 +++ b/src/xen_internal.c Thu May 21 16:27:16 2009 +0100 @@ -3434,6 +3434,6 @@ xenHavePrivilege() #ifdef __sun return priv_ineffect (PRIV_XVM_CONTROL); #else - return getuid () == 0; + return access(XEN_HYPERVISOR_SOCKET, R_OK) == 0; #endif } diff -r 5e3b5d1f91c2 src/xen_unified.c --- a/src/xen_unified.c Thu May 21 16:21:20 2009 +0100 +++ b/src/xen_unified.c Thu May 21 16:27:16 2009 +0100 @@ -175,7 +175,7 @@ done: #ifdef WITH_LIBVIRTD static int -xenInitialize (void) +xenInitialize (int privileged ATTRIBUTE_UNUSED) { inside_daemon = 1; return 0; -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 2

[libvirt] PATCH Fix BuildRequires in spec file
by Trent Johnson 02 Jun '09

02 Jun '09

Fixes error from rpmbuild RPM build errors: File not found: /var/tmp/libvirt-0.6.3-1.el5-root/usr/libexec/libvirt_parthelper diff -u -r libvirt.spec.orig libvirt.spec --- libvirt.spec.orig 2009-04-24 08:58:29.000000000 -0500 +++ libvirt.spec 2009-05-29 09:57:56.000000000 -0500 @@ -59,7 +59,7 @@ Source: libvirt-%{version}.tar.gz BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root URL: http://libvirt.org/ -BuildRequires: python python-devel +BuildRequires: python python-devel e2fsprogs-devel Requires: libxml2 Requires: readline Requires: ncurses

2 4