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-rw-r--r--agents/virt/server/mcast.c622
1 files changed, 622 insertions, 0 deletions
diff --git a/agents/virt/server/mcast.c b/agents/virt/server/mcast.c
new file mode 100644
index 0000000..a95ab37
--- /dev/null
+++ b/agents/virt/server/mcast.c
@@ -0,0 +1,622 @@
+/*
+ Copyright Red Hat, Inc. 2006
+
+ 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 "xvm.h"
+#include "simple_auth.h"
+#include "options.h"
+#include "mcast.h"
+#include "tcp.h"
+#include "debug.h"
+#include "fdops.h"
+#include "list.h"
+#include "simpleconfig.h"
+#include "static_map.h"
+#include "server_plugin.h"
+#include "history.h"
+
+#define NAME "multicast"
+#define MCAST_VERSION "1.3"
+
+#define MCAST_MAGIC 0xabb911a3
+
+#define VALIDATE(info) \
+do {\
+ if (!info || info->magic != MCAST_MAGIC)\
+ return -EINVAL;\
+} while(0)
+
+typedef struct _mcast_options {
+ char *addr;
+ char *key_file;
+ int ifindex;
+ int family;
+ unsigned int port;
+ unsigned int hash;
+ unsigned int auth;
+ unsigned int flags;
+} mcast_options;
+
+
+typedef struct _mcast_info {
+ uint64_t magic;
+ void *priv;
+ map_object_t *map;
+ history_info_t *history;
+ char key[MAX_KEY_LEN];
+ mcast_options args;
+ const fence_callbacks_t *cb;
+ ssize_t key_len;
+ int mc_sock;
+ int need_kill;
+} mcast_info;
+
+
+struct mcast_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) {
+ fence_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
+connect_tcp(fence_req_t *req, fence_auth_type_t auth,
+ void *key, size_t key_len)
+{
+ int fd = -1;
+ struct sockaddr_in sin;
+ struct sockaddr_in6 sin6;
+ char buf[128];
+
+ switch(req->family) {
+ case PF_INET:
+ memset(&sin, 0, sizeof(sin));
+ memcpy(&sin.sin_addr, req->address,
+ sizeof(sin.sin_addr));
+ sin.sin_family = PF_INET;
+ fd = ipv4_connect(&sin.sin_addr, req->port,
+ 5);
+ if (fd < 0) {
+ printf("Failed to call back\n");
+ return -1;
+ }
+ break;
+ case PF_INET6:
+ memset(&sin6, 0, sizeof(sin6));
+ memcpy(&sin6.sin6_addr, req->address,
+ sizeof(sin6.sin6_addr));
+ sin.sin_family = PF_INET6;
+ fd = ipv6_connect(&sin6.sin6_addr, req->port,
+ 5);
+
+ memset(buf,0,sizeof(buf));
+ inet_ntop(PF_INET6, &sin6.sin6_addr, buf, sizeof(buf));
+
+ if (fd < 0) {
+ printf("Failed to call back %s\n", buf);
+ return -1;
+ }
+ break;
+ default:
+ printf("Family = %d\n", req->family);
+ return -1;
+ }
+
+ /* Noops if auth == AUTH_NONE */
+ if (sock_response(fd, auth, key, key_len, 10) <= 0) {
+ printf("Failed to respond to challenge\n");
+ close(fd);
+ return -1;
+ }
+
+ if (sock_challenge(fd, auth, key, key_len, 10) <= 0) {
+ printf("Remote failed challenge\n");
+ close(fd);
+ return -1;
+ }
+ return fd;
+}
+
+
+static int
+mcast_hostlist(const char *vm_name, const char *vm_uuid,
+ int state, void *priv)
+{
+ struct mcast_hostlist_arg *arg = (struct mcast_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
+mcast_hostlist_begin(int fd)
+{
+ struct timeval tv;
+ char val = (char)RESP_HOSTLIST;
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ return _write_retry(fd, &val, 1, &tv);
+}
+
+
+static int
+mcast_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_tcp(fence_req_t *req, mcast_info *info)
+{
+ char ip_addr_src[1024];
+ int fd = -1;
+ char response = 1;
+ struct mcast_hostlist_arg arg;
+
+ fd = connect_tcp(req, info->args.auth, info->key, info->key_len);
+ if (fd < 0) {
+ dbg_printf(2, "Could not send reply to fence request: %s\n",
+ strerror(errno));
+ goto out;
+ }
+
+ inet_ntop(req->family, req->address,
+ ip_addr_src, sizeof(ip_addr_src));
+
+ dbg_printf(2, "Request %d seqno %d src %s target %s\n",
+ req->request, req->seqno, ip_addr_src, req->domain);
+
+ switch(req->request) {
+ case FENCE_NULL:
+ response = info->cb->null((char *)req->domain, info->priv);
+ break;
+ case FENCE_ON:
+ if (map_check(info->map, ip_addr_src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->on((char *)req->domain, ip_addr_src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_OFF:
+ if (map_check(info->map, ip_addr_src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->off((char *)req->domain, ip_addr_src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_REBOOT:
+ if (map_check(info->map, ip_addr_src,
+ (const char *)req->domain) == 0) {
+ response = RESP_PERM;
+ break;
+ }
+ response = info->cb->reboot((char *)req->domain, ip_addr_src,
+ req->seqno, info->priv);
+ break;
+ case FENCE_STATUS:
+ if (map_check(info->map, ip_addr_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->map;
+ arg.src = ip_addr_src;
+ arg.fd = fd;
+
+ mcast_hostlist_begin(arg.fd);
+ response = info->cb->hostlist(mcast_hostlist, &arg,
+ info->priv);
+ mcast_hostlist_end(arg.fd);
+ break;
+ }
+
+ dbg_printf(3, "Sending response to caller...\n");
+ if (_write_retry(fd, &response, 1, 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);
+out:
+ if (fd != -1)
+ close(fd);
+
+ return 1;
+}
+
+
+static int
+mcast_dispatch(listener_context_t c, struct timeval *timeout)
+{
+ mcast_info *info;
+ fence_req_t data;
+ fd_set rfds;
+ struct sockaddr_in sin;
+ int len;
+ int n;
+ socklen_t slen;
+
+ info = (mcast_info *)c;
+ VALIDATE(info);
+
+ FD_ZERO(&rfds);
+ FD_SET(info->mc_sock, &rfds);
+
+ n = select((info->mc_sock)+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;
+ }
+
+ slen = sizeof(sin);
+ len = recvfrom(info->mc_sock, &data, sizeof(data), 0,
+ (struct sockaddr *)&sin, &slen);
+
+ if (len <= 0) {
+ perror("recvfrom");
+ return len;
+ }
+
+ swab_fence_req_t(&data);
+
+ if (!verify_request(&data, info->args.hash, info->key,
+ info->key_len)) {
+ printf("Key mismatch; dropping packet\n");
+ return 0;
+ }
+
+ printf("Request %d seqno %d domain %s\n", data.request, data.seqno,
+ data.domain);
+
+ if (history_check(info->history, &data) == 1) {
+ printf("We just did this request; dropping packet\n");
+ return 0;
+ }
+
+ switch(info->args.auth) {
+ case AUTH_NONE:
+ case AUTH_SHA1:
+ case AUTH_SHA256:
+ case AUTH_SHA512:
+ printf("Plain TCP request\n");
+ do_fence_request_tcp(&data, info);
+ break;
+ default:
+ printf("XXX Unhandled authentication\n");
+ }
+
+ return 0;
+}
+
+
+static int
+mcast_config(config_object_t *config, mcast_options *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/multicast/@key_file",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for key_file\n", value);
+ args->key_file = strdup(value);
+ } else {
+ args->key_file = strdup(DEFAULT_KEY_FILE);
+ if (!args->key_file) {
+ dbg_printf(1, "Failed to allocate memory\n");
+ return -1;
+ }
+ }
+
+ args->hash = DEFAULT_HASH;
+ if (sc_get(config, "listeners/multicast/@hash",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for hash\n", value);
+ if (!strcasecmp(value, "none")) {
+ args->hash = HASH_NONE;
+ } else if (!strcasecmp(value, "sha1")) {
+ args->hash = HASH_SHA1;
+ } else if (!strcasecmp(value, "sha256")) {
+ args->hash = HASH_SHA256;
+ } else if (!strcasecmp(value, "sha512")) {
+ args->hash = HASH_SHA512;
+ } else {
+ dbg_printf(1, "Unsupported hash: %s\n", value);
+ ++errors;
+ }
+ }
+
+ args->auth = DEFAULT_AUTH;
+ if (sc_get(config, "listeners/multicast/@auth",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for auth\n", value);
+ if (!strcasecmp(value, "none")) {
+ args->auth = AUTH_NONE;
+ } else if (!strcasecmp(value, "sha1")) {
+ args->auth = AUTH_SHA1;
+ } else if (!strcasecmp(value, "sha256")) {
+ args->auth = AUTH_SHA256;
+ } else if (!strcasecmp(value, "sha512")) {
+ args->auth = AUTH_SHA512;
+ } else {
+ dbg_printf(1, "Unsupported auth: %s\n", value);
+ ++errors;
+ }
+ }
+
+ args->family = PF_INET;
+ if (sc_get(config, "listeners/multicast/@family",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for family\n", value);
+ if (!strcasecmp(value, "ipv4")) {
+ args->family = PF_INET;
+ } else if (!strcasecmp(value, "ipv6")) {
+ args->family = PF_INET6;
+ } else {
+ dbg_printf(1, "Unsupported family: %s\n", value);
+ ++errors;
+ }
+ }
+
+ if (sc_get(config, "listeners/multicast/@address",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for address\n", value);
+ args->addr = strdup(value);
+ } else {
+ if (args->family == PF_INET) {
+ args->addr = strdup(IPV4_MCAST_DEFAULT);
+ } else {
+ args->addr = strdup(IPV6_MCAST_DEFAULT);
+ }
+ }
+ if (!args->addr) {
+ return -1;
+ }
+
+ args->port = DEFAULT_MCAST_PORT;
+ if (sc_get(config, "listeners/multicast/@port",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for port\n", value);
+ args->port = atoi(value);
+ if (args->port <= 0) {
+ dbg_printf(1, "Invalid port: %s\n", value);
+ ++errors;
+ }
+ }
+
+ args->ifindex = 0;
+ if (sc_get(config, "listeners/multicast/@interface",
+ value, sizeof(value)-1) == 0) {
+ dbg_printf(1, "Got %s for interface\n", value);
+ args->ifindex = if_nametoindex(value);
+ if (args->ifindex < 0) {
+ dbg_printf(1, "Invalid interface: %s\n", value);
+ ++errors;
+ }
+ }
+
+ return errors;
+}
+
+
+static int
+mcast_init(listener_context_t *c, const fence_callbacks_t *cb,
+ config_object_t *config, map_object_t *map, void *priv)
+{
+ mcast_info *info;
+ int mc_sock, ret;
+
+ /* Initialize NSS; required to do hashing, as silly as that
+ sounds... */
+ if (NSS_NoDB_Init(NULL) != SECSuccess) {
+ printf("Could not initialize NSS\n");
+ return 1;
+ }
+
+ info = malloc(sizeof(*info));
+ if (!info)
+ return -1;
+ memset(info, 0, sizeof(*info));
+
+ info->priv = priv;
+ info->cb = cb;
+ info->map = map;
+
+ ret = mcast_config(config, &info->args);
+ if (ret < 0) {
+ perror("mcast_config");
+ free(info);
+ return -1;
+ } else if (ret > 0) {
+ printf("%d errors found during configuration\n",ret);
+ free(info);
+ return -1;
+ }
+
+ if (info->args.auth != AUTH_NONE || info->args.hash != HASH_NONE) {
+ info->key_len = read_key_file(info->args.key_file,
+ info->key, sizeof(info->key));
+ if (info->key_len < 0) {
+ printf("Could not read %s; operating without "
+ "authentication\n", info->args.key_file);
+ info->args.auth = AUTH_NONE;
+ info->args.hash = HASH_NONE;
+ info->key_len = 0;
+ }
+ }
+
+ if (info->args.family == PF_INET)
+ mc_sock = ipv4_recv_sk(info->args.addr,
+ info->args.port,
+ info->args.ifindex);
+ else
+ mc_sock = ipv6_recv_sk(info->args.addr,
+ info->args.port,
+ info->args.ifindex);
+ if (mc_sock < 0) {
+ printf("Could not set up multicast listen socket\n");
+ free(info);
+ return -1;
+ }
+
+ info->magic = MCAST_MAGIC;
+ info->mc_sock = mc_sock;
+ info->history = history_init(check_history, 10, sizeof(fence_req_t));
+ *c = (listener_context_t)info;
+ return 0;
+}
+
+
+static int
+mcast_shutdown(listener_context_t c)
+{
+ mcast_info *info = (mcast_info *)c;
+
+ VALIDATE(info);
+ info->magic = 0;
+ history_wipe(info->history);
+ free(info->history);
+ free(info->args.key_file);
+ free(info->args.addr);
+ close(info->mc_sock);
+ free(info);
+
+ return 0;
+}
+
+
+static listener_plugin_t mcast_plugin = {
+ .name = NAME,
+ .version = MCAST_VERSION,
+ .init = mcast_init,
+ .dispatch = mcast_dispatch,
+ .cleanup = mcast_shutdown,
+};
+
+double
+LISTENER_VER_SYM(void)
+{
+ return PLUGIN_VERSION_LISTENER;
+}
+
+const listener_plugin_t *
+LISTENER_INFO_SYM(void)
+{
+ return &mcast_plugin;
+}
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