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-rw-r--r--agents/virt/server/serial.c459
1 files changed, 459 insertions, 0 deletions
diff --git a/agents/virt/server/serial.c b/agents/virt/server/serial.c
new file mode 100644
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--- /dev/null
+++ b/agents/virt/server/serial.c
@@ -0,0 +1,459 @@
+/*
+ Copyright Red Hat, Inc. 2010
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
+ MA 02139, USA.
+*/
+/*
+ * Author: Lon Hohberger <lhh at redhat.com>
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <pthread.h>
+#include <nss.h>
+#include <libgen.h>
+
+/* Local includes */
+#include "debug.h"
+#include "fdops.h"
+#include "serial.h"
+#include "list.h"
+#include "simpleconfig.h"
+#include "static_map.h"
+#include "server_plugin.h"
+#include "history.h"
+#include "xvm.h"
+
+#define NAME "serial"
+#define SERIAL_VERSION "0.5"
+
+#define SERIAL_PLUG_MAGIC 0x1227a000
+
+#define VALIDATE(info) \
+do {\
+ if (!info || info->magic != SERIAL_PLUG_MAGIC)\
+ return -EINVAL;\
+} while(0)
+
+
+typedef struct _serial_info {
+ uint64_t magic;
+ const fence_callbacks_t *cb;
+ void *priv;
+ char *uri;
+ char *path;
+ history_info_t *history;
+ map_object_t *maps;
+ int mode;
+ int wake_fd;
+} serial_info;
+
+
+struct serial_hostlist_arg {
+ map_object_t *map;
+ const char *src;
+ int fd;
+};
+
+
+/*
+ * See if we fenced this node recently (successfully)
+ * If so, ignore the request for a few seconds.
+ *
+ * We purge our history when the entries time out.
+ */
+static int
+check_history(void *a, void *b) {
+ serial_req_t *old = a, *current = b;
+
+ if (old->request == current->request &&
+ old->seqno == current->seqno &&
+ !strcasecmp((const char *)old->domain,
+ (const char *)current->domain)) {
+ return 1;
+ }
+ return 0;
+}
+
+
+static int
+serial_hostlist(const char *vm_name, const char *vm_uuid,
+ int state, void *priv)
+{
+ struct serial_hostlist_arg *arg = (struct serial_hostlist_arg *)priv;
+ host_state_t hinfo;
+ struct timeval tv;
+ int ret;
+
+ if (map_check2(arg->map, arg->src, vm_uuid, vm_name) == 0) {
+ /* if we don't have access to fence this VM,
+ * we should not see it in a hostlist either */
+ return 0;
+ }
+
+ strncpy((char *)hinfo.domain, vm_name, sizeof(hinfo.domain) - 1);
+ strncpy((char *)hinfo.uuid, vm_uuid, sizeof(hinfo.uuid) - 1);
+ hinfo.state = state;
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+
+ ret = _write_retry(arg->fd, &hinfo, sizeof(hinfo), &tv);
+ if (ret == sizeof(hinfo))
+ return 0;
+ return 1;
+}
+
+
+static int
+serial_hostlist_begin(int fd)
+{
+ struct timeval tv;
+ serial_resp_t resp;
+
+ resp.magic = SERIAL_MAGIC;
+ resp.response = RESP_HOSTLIST;
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ return _write_retry(fd, &resp, sizeof(resp), &tv);
+}
+
+
+static int
+serial_hostlist_end(int fd)
+{
+ host_state_t hinfo;
+ struct timeval tv;
+ int ret;
+
+ //printf("Sending terminator packet\n");
+
+ memset(&hinfo, 0, sizeof(hinfo));
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ ret = _write_retry(fd, &hinfo, sizeof(hinfo), &tv);
+ if (ret == sizeof(hinfo))
+ return 0;
+ return 1;
+}
+
+
+static int
+do_fence_request(int fd, const char *src, serial_req_t *req, serial_info *info)
+{
+ char response = RESP_FAIL;
+ struct serial_hostlist_arg arg;
+ serial_resp_t resp;
+
+ arg.fd = fd;
+
+ switch(req->request) {
+ case FENCE_NULL:
+ response = info->cb->null((char *)req->domain, info->priv);
+ break;
+ case FENCE_ON:
+ if (map_check(info->maps, src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->on((char *)req->domain, src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_OFF:
+ if (map_check(info->maps, src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->off((char *)req->domain, src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_REBOOT:
+ if (map_check(info->maps, src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->reboot((char *)req->domain, src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_STATUS:
+ if (map_check(info->maps, src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->status((char *)req->domain, info->priv);
+ break;
+ case FENCE_DEVSTATUS:
+ response = info->cb->devstatus(info->priv);
+ break;
+ case FENCE_HOSTLIST:
+ arg.map = info->maps;
+ arg.src = src;
+ arg.fd = fd;
+
+ serial_hostlist_begin(arg.fd);
+ response = info->cb->hostlist(serial_hostlist, &arg,
+ info->priv);
+ serial_hostlist_end(arg.fd);
+ break;
+ }
+
+ resp.magic = SERIAL_MAGIC;
+ resp.response = response;
+ swab_serial_resp_t(&resp);
+
+ dbg_printf(3, "Sending response to caller...\n");
+ if (_write_retry(fd, &resp, sizeof(resp), NULL) < 0)
+ perror("write");
+
+ /* XVM shotguns multicast packets, so we want to avoid
+ * acting on the same request multiple times if the first
+ * attempt was successful.
+ */
+ history_record(info->history, req);
+
+ return 1;
+}
+
+
+static int
+serial_dispatch(listener_context_t c, struct timeval *timeout)
+{
+ char src_domain[MAX_DOMAINNAME_LENGTH];
+ serial_info *info;
+ serial_req_t data;
+ fd_set rfds;
+ struct timeval tv;
+ int max;
+ int n, x, ret;
+
+ info = (serial_info *)c;
+ VALIDATE(info);
+
+ FD_ZERO(&rfds);
+ domain_sock_fdset(&rfds, &max);
+ FD_SET(info->wake_fd, &rfds);
+ if (info->wake_fd > max)
+ max = info->wake_fd;
+
+ n = select(max+1, &rfds, NULL, NULL, timeout);
+ if (n < 0) {
+ if (errno == EINTR || errno == EAGAIN)
+ n = 0;
+ else
+ dbg_printf(2, "select: %s\n", strerror(errno));
+ return n;
+ }
+
+ /*
+ * See if the goal was just to be woken up in order to refill our
+ * file descriptor set. For example, if multiple domains were
+ * created simultaneously, we would have to refill our fd_set
+ */
+ if (FD_ISSET(info->wake_fd, &rfds)) {
+ tv.tv_sec = 0;
+ tv.tv_usec = 10000;
+ _read_retry(info->wake_fd, &c, 1, &tv);
+ return 0;
+ }
+
+ /*
+ * If no requests, we're done
+ */
+ if (n == 0)
+ return 0;
+
+ /* find & read request */
+ for (x = 0; x <= max; x++) {
+ if (FD_ISSET(x, &rfds)) {
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+
+ ret = _read_retry(x, &data, sizeof(data), &tv);
+
+ if (ret != sizeof(data)) {
+ if (--n > 0)
+ continue;
+ else
+ return 0;
+ } else {
+ swab_serial_req_t(&data);
+ break;
+ }
+ }
+ }
+
+ src_domain[0] = 0;
+ domain_sock_name(x, src_domain, sizeof(src_domain));
+
+ dbg_printf(2, "Sock %d Request %d seqno %d src %s target %s\n", x,
+ data.request, data.seqno, src_domain, data.domain);
+
+ if (history_check(info->history, &data) == 1) {
+ dbg_printf(3, "We just did this request; dropping packet\n");
+ return 0;
+ }
+
+ do_fence_request(x, src_domain[0] == 0 ? NULL : src_domain,
+ &data, info);
+
+ return 0;
+}
+
+
+static int
+serial_config(config_object_t *config, serial_info *args)
+{
+ char value[1024];
+ int errors = 0;
+
+ if (sc_get(config, "fence_virtd/@debug", value, sizeof(value))==0)
+ dset(atoi(value));
+
+ if (sc_get(config, "listeners/serial/@uri",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for uri\n", value);
+ args->uri = strdup(value);
+ }
+
+ if (sc_get(config, "listeners/serial/@path",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for path\n", value);
+ args->path = strdup(value);
+ }
+
+ if (sc_get(config, "listeners/serial/@mode",
+ value, sizeof(value)-1) == 0) {
+ if (!strcasecmp(value, "vmchannel")) {
+ args->mode = 1;
+ } else if (!strcasecmp(value, "serial")) {
+ args->mode = 0;
+ } else {
+ args->mode = atoi(value);
+ if (args->mode < 0)
+ args->mode = 0;
+ }
+
+ dbg_printf(1, "Got %s for mode\n",
+ args->mode?"VMChannel":"serial");
+
+ }
+
+ return errors;
+}
+
+
+static int
+serial_init(listener_context_t *c, const fence_callbacks_t *cb,
+ config_object_t *config, map_object_t *map, void *priv)
+{
+ serial_info *info;
+ int ret;
+
+ info = malloc(sizeof(*info));
+ if (!info)
+ return -1;
+ memset(info, 0, sizeof(*info));
+
+ info->priv = priv;
+ info->cb = cb;
+
+ ret = serial_config(config, info);
+ if (ret < 0) {
+ perror("serial_config");
+ return -1;
+ } else if (ret > 0) {
+ printf("%d errors found during configuration\n",ret);
+ return -1;
+ }
+
+ info->maps = map;
+
+ info->magic = SERIAL_PLUG_MAGIC;
+ info->history = history_init(check_history, 10, sizeof(fence_req_t));
+ *c = (listener_context_t)info;
+ start_event_listener(info->uri, info->path, info->mode, &info->wake_fd);
+ sleep(1);
+
+ return 0;
+}
+
+
+static int
+serial_shutdown(listener_context_t c)
+{
+ serial_info *info = (serial_info *)c;
+
+ dbg_printf(3, "Shutting down serial\n");
+
+ VALIDATE(info);
+ info->magic = 0;
+ stop_event_listener();
+ domain_sock_cleanup();
+ history_wipe(info->history);
+ free(info->history);
+ free(info->uri);
+ free(info->path);
+ free(info);
+
+ return 0;
+}
+
+
+static listener_plugin_t serial_plugin = {
+ .name = NAME,
+ .version = SERIAL_VERSION,
+ .init = serial_init,
+ .dispatch = serial_dispatch,
+ .cleanup = serial_shutdown,
+};
+
+double
+LISTENER_VER_SYM(void)
+{
+ return PLUGIN_VERSION_LISTENER;
+}
+
+const listener_plugin_t *
+LISTENER_INFO_SYM(void)
+{
+ return &serial_plugin;
+}
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