+++ /dev/null
-/* $NetBSD: xenbackendd.c,v 1.1.1.1 2008/08/07 20:26:57 cegger Exp $ */
-/*
- * Copyright (C) 2006 Manuel Bouyer <bouyer@netbsd.org>
- * Copyright (C) 2009 Christoph Egger <Christoph.Egger@amd.com>
- *
- * 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; under version 2 of the License.
- *
- * 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; If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <syslog.h>
-
-#include <xenstore.h>
-
-#include "_paths.h"
-
-#define DEVTYPE_UNKNOWN 0
-#define DEVTYPE_VIF 1
-#define DEVTYPE_VBD 2
-#define DISABLE_EXEC "libxl/disable_udev"
-
-#define DOMAIN_PATH "/local/domain/0"
-
-#ifndef XEN_SCRIPT_DIR
-#error XEN_SCRIPT_DIR not defined
-#endif
-
-#ifndef VBD_SCRIPT
-#define VBD_SCRIPT XEN_SCRIPT_DIR"/block"
-#endif
-#ifndef LOG_FILE
-#define LOG_FILE XEN_LOG_DIR "xenbackendd.log"
-#endif
-#ifndef PID_FILE
-#define PID_FILE XEN_RUN_DIR "xenbackendd.pid"
-#endif
-
-
-struct xs_handle *xs;
-
-int fflag = 0;
-int dflag = 0;
-
-const char *vbd_script = NULL;
-const char *log_file = NULL;
-const char *pidfile = NULL;
-
-static void
-dolog(int pri, const char *fmt, ...)
-{
- va_list ap;
- va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
- va_end(ap);
- fprintf(stderr, "\n");
- fflush(stderr);
- va_start(ap, fmt);
- vsyslog(pri, fmt, ap);
- va_end(ap);
-}
-
-static void
-dodebug(const char *fmt, ...)
-{
- va_list ap;
-
- if (dflag == 0)
- return;
- va_start(ap, fmt);
- vfprintf(stdout, fmt, ap);
- va_end(ap);
- printf("\n");
- fflush(stdout);
-}
-
-static void
-doexec(const char *cmd, const char *arg1, const char *arg2)
-{
- dodebug("exec %s %s %s", cmd, arg1, arg2);
- switch(vfork()) {
- case -1:
- dolog(LOG_ERR, "can't vfork: %s", strerror(errno));
- break;
- case 0:
- execl(cmd, cmd, arg1, arg2, NULL);
- dolog(LOG_ERR, "can't exec %s: %s", cmd, strerror(errno));
- exit(EXIT_FAILURE);
- /* NOTREACHED */
- break;
- default:
- wait(NULL);
- break;
- }
-}
-
-static void
-usage(void)
-{
- fprintf(stderr,
- "usage: %s [-d] [-f] [-l log_file] [-p pif_file] [-s vbd_script]\n",
- getprogname());
- exit(EXIT_FAILURE);
-}
-
-static int
-xen_setup(void)
-{
- xs = xs_open(0);
- if (xs == NULL) {
- dolog(LOG_ERR,
- "Failed to contact xenstore (%s). Is it running?",
- strerror(errno));
- goto out;
- }
-
- if (!xs_watch(xs, DOMAIN_PATH, "backend")) {
- dolog(LOG_ERR, "xenstore watch on backend fails.");
- goto out;
- }
- return 0;
-
- out:
- if (xs) {
- xs_close(xs);
- xs = NULL;
- }
- return -1;
-}
-
-int
-main(int argc, char * const argv[])
-{
- char **vec;
- unsigned int num;
- char *s;
- int state;
- char *sstate, *sdisable;
- char *p;
- char buf[80];
- int type;
- int ch;
- int debug_fd;
- FILE *pidfile_f;
-
- while ((ch = getopt(argc, argv, "dfl:p:s:")) != -1) {
- switch (ch) {
- case 'd':
- dflag = 1;
- break;
- case 'f':
- fflag = 1;
- break;
- case 'l':
- log_file = optarg;
- break;
- case 'p':
- pidfile = optarg;
- case 's':
- vbd_script = optarg;
- break;
- default:
- usage();
- }
- }
-
- if (vbd_script == NULL)
- vbd_script = VBD_SCRIPT;
- if (pidfile == NULL)
- pidfile = PID_FILE;
- if (log_file == NULL)
- log_file = LOG_FILE;
-
- openlog("xenbackendd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
-
- if (fflag == 0) {
- /* open log file */
- debug_fd = open(log_file, O_RDWR | O_CREAT | O_TRUNC, 0644);
- if (debug_fd == -1) {
- dolog(LOG_ERR, "can't open %s: %s",
- log_file, strerror(errno));
- exit(EXIT_FAILURE);
- }
- }
-
- if (fflag == 0) {
- /* daemonize */
- pidfile_f = fopen(pidfile, "w");
- if (pidfile_f == NULL) {
- dolog(LOG_ERR, "can't open %s: %s",
- pidfile, strerror(errno));
- exit(EXIT_FAILURE);
- }
- if (daemon(0, 0) < 0) {
- dolog(LOG_ERR, "can't daemonize: %s",
- strerror(errno));
- exit(EXIT_FAILURE);
- }
- fprintf(pidfile_f, "%d\n", (int)getpid());
- fclose(pidfile_f);
-
- /* redirect stderr to log file */
- if (dup2(debug_fd, STDERR_FILENO) < 0) {
- dolog(LOG_ERR, "can't redirect stderr to %s: %s\n",
- log_file, strerror(errno));
- exit(EXIT_FAILURE);
- }
-
- /* also redirect stdout if we're in debug mode */
- if (dflag) {
- if (dup2(debug_fd, STDOUT_FILENO) < 0) {
- dolog(LOG_ERR,
- "can't redirect stdout to %s: %s\n",
- log_file, strerror(errno));
- exit(EXIT_FAILURE);
- }
- }
-
- close(debug_fd);
- debug_fd = -1;
- }
-
- if (xen_setup() < 0)
- exit(EXIT_FAILURE);
-
- for (;;) {
- vec = xs_read_watch(xs, &num);
- dodebug("read from xen watch: %s", *vec);
- if (!vec) {
- dolog(LOG_ERR, "xs_read_watch: NULL\n");
- continue;
- }
-
- sdisable = xs_read(xs, XBT_NULL, DISABLE_EXEC, 0);
- if (sdisable)
- goto next1;
-
- if (strlen(vec[XS_WATCH_PATH]) < sizeof("state"))
- goto next1;
-
- /* find last component of path, check if it's "state" */
- p = &vec[XS_WATCH_PATH][
- strlen(vec[XS_WATCH_PATH]) - sizeof("state")];
- if (p[0] != '/')
- goto next1;
- p[0] = '\0';
- p++;
- if (strcmp(p, "state") != 0)
- goto next1;
-
- snprintf(buf, sizeof(buf), "%s/state", vec[XS_WATCH_PATH]);
- sstate = xs_read(xs, XBT_NULL, buf, 0);
- if (sstate == NULL) {
- dolog(LOG_ERR,
- "Failed to read %s (%s)", buf, strerror(errno));
- goto next1;
- }
-
- state = atoi(sstate);
- snprintf(buf, sizeof(buf), "%s/hotplug-status",
- vec[XS_WATCH_PATH]);
- s = xs_read(xs, XBT_NULL, buf, 0);
- if (s != NULL && state != 6 /* XenbusStateClosed */)
- goto next2;
-
- type = DEVTYPE_UNKNOWN;
- if (strncmp(vec[XS_WATCH_PATH],
- DOMAIN_PATH "/backend/vif",
- strlen(DOMAIN_PATH "/backend/vif")) == 0)
- type = DEVTYPE_VIF;
-
- if (strncmp(vec[XS_WATCH_PATH],
- DOMAIN_PATH "/backend/vbd",
- strlen(DOMAIN_PATH "/backend/vbd")) == 0)
- type = DEVTYPE_VBD;
-
- switch(type) {
- case DEVTYPE_VIF:
- free(s);
- snprintf(buf, sizeof(buf), "%s/script",
- vec[XS_WATCH_PATH]);
- s = xs_read(xs, XBT_NULL, buf, 0);
- if (s == NULL) {
- dolog(LOG_ERR,
- "Failed to read %s (%s)", buf,
- strerror(errno));
- goto next2;
- }
- doexec(s, vec[XS_WATCH_PATH], sstate);
- break;
-
- case DEVTYPE_VBD:
- doexec(vbd_script, vec[XS_WATCH_PATH], sstate);
- break;
-
- default:
- break;
- }
-
-next2:
- free(s);
- free(sstate);
-
-next1:
- free(sdisable);
- free(vec);
- }
-
- return 0;
-}
projects / people / jgross / xen.git / commitdiff