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9d6f1b73f8
FHS requires that pid files should end with a new line. Also change to snprintf() while there. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
902 lines
25 KiB
C
902 lines
25 KiB
C
/*
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* QEMU Guest Agent
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*
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* Copyright IBM Corp. 2011
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*
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* Authors:
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* Adam Litke <aglitke@linux.vnet.ibm.com>
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <glib.h>
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#include <getopt.h>
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#ifndef _WIN32
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#include <syslog.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#endif
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#include "json-streamer.h"
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#include "json-parser.h"
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#include "qint.h"
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#include "qjson.h"
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#include "qga/guest-agent-core.h"
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#include "module.h"
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#include "signal.h"
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#include "qerror.h"
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#include "qapi/qmp-core.h"
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#include "qga/channel.h"
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#ifdef _WIN32
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#include "qga/service-win32.h"
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#include <windows.h>
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#endif
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#ifndef _WIN32
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#define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
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#else
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#define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
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#endif
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#define QGA_STATEDIR_DEFAULT CONFIG_QEMU_LOCALSTATEDIR "/run"
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#define QGA_PIDFILE_DEFAULT QGA_STATEDIR_DEFAULT "/qemu-ga.pid"
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#define QGA_SENTINEL_BYTE 0xFF
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struct GAState {
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JSONMessageParser parser;
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GMainLoop *main_loop;
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GAChannel *channel;
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bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
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GACommandState *command_state;
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GLogLevelFlags log_level;
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FILE *log_file;
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bool logging_enabled;
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#ifdef _WIN32
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GAService service;
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#endif
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bool delimit_response;
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bool frozen;
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GList *blacklist;
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const char *state_filepath_isfrozen;
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struct {
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const char *log_filepath;
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const char *pid_filepath;
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} deferred_options;
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};
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struct GAState *ga_state;
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/* commands that are safe to issue while filesystems are frozen */
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static const char *ga_freeze_whitelist[] = {
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"guest-ping",
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"guest-info",
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"guest-sync",
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"guest-fsfreeze-status",
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"guest-fsfreeze-thaw",
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NULL
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};
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#ifdef _WIN32
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DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
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LPVOID ctx);
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VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
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#endif
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static void quit_handler(int sig)
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{
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/* if we're frozen, don't exit unless we're absolutely forced to,
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* because it's basically impossible for graceful exit to complete
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* unless all log/pid files are on unfreezable filesystems. there's
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* also a very likely chance killing the agent before unfreezing
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* the filesystems is a mistake (or will be viewed as one later).
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*/
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if (ga_is_frozen(ga_state)) {
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return;
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}
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g_debug("received signal num %d, quitting", sig);
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if (g_main_loop_is_running(ga_state->main_loop)) {
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g_main_loop_quit(ga_state->main_loop);
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}
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}
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#ifndef _WIN32
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static gboolean register_signal_handlers(void)
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{
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struct sigaction sigact;
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int ret;
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memset(&sigact, 0, sizeof(struct sigaction));
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sigact.sa_handler = quit_handler;
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ret = sigaction(SIGINT, &sigact, NULL);
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if (ret == -1) {
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g_error("error configuring signal handler: %s", strerror(errno));
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}
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ret = sigaction(SIGTERM, &sigact, NULL);
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if (ret == -1) {
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g_error("error configuring signal handler: %s", strerror(errno));
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}
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return true;
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}
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/* TODO: use this in place of all post-fork() fclose(std*) callers */
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void reopen_fd_to_null(int fd)
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{
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int nullfd;
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nullfd = open("/dev/null", O_RDWR);
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if (nullfd < 0) {
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return;
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}
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dup2(nullfd, fd);
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if (nullfd != fd) {
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close(nullfd);
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}
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}
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#endif
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static void usage(const char *cmd)
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{
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printf(
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"Usage: %s [-m <method> -p <path>] [<options>]\n"
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"QEMU Guest Agent %s\n"
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"\n"
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" -m, --method transport method: one of unix-listen, virtio-serial, or\n"
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" isa-serial (virtio-serial is the default)\n"
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" -p, --path device/socket path (the default for virtio-serial is:\n"
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" %s)\n"
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" -l, --logfile set logfile path, logs to stderr by default\n"
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" -f, --pidfile specify pidfile (default is %s)\n"
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" -t, --statedir specify dir to store state information (absolute paths\n"
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" only, default is %s)\n"
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" -v, --verbose log extra debugging information\n"
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" -V, --version print version information and exit\n"
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" -d, --daemonize become a daemon\n"
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#ifdef _WIN32
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" -s, --service service commands: install, uninstall\n"
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#endif
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" -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
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" to list available RPCs)\n"
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" -h, --help display this help and exit\n"
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"\n"
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"Report bugs to <mdroth@linux.vnet.ibm.com>\n"
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, cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_PIDFILE_DEFAULT,
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QGA_STATEDIR_DEFAULT);
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}
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static const char *ga_log_level_str(GLogLevelFlags level)
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{
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switch (level & G_LOG_LEVEL_MASK) {
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case G_LOG_LEVEL_ERROR:
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return "error";
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case G_LOG_LEVEL_CRITICAL:
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return "critical";
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case G_LOG_LEVEL_WARNING:
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return "warning";
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case G_LOG_LEVEL_MESSAGE:
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return "message";
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case G_LOG_LEVEL_INFO:
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return "info";
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case G_LOG_LEVEL_DEBUG:
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return "debug";
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default:
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return "user";
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}
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}
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bool ga_logging_enabled(GAState *s)
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{
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return s->logging_enabled;
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}
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void ga_disable_logging(GAState *s)
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{
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s->logging_enabled = false;
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}
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void ga_enable_logging(GAState *s)
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{
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s->logging_enabled = true;
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}
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static void ga_log(const gchar *domain, GLogLevelFlags level,
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const gchar *msg, gpointer opaque)
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{
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GAState *s = opaque;
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GTimeVal time;
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const char *level_str = ga_log_level_str(level);
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if (!ga_logging_enabled(s)) {
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return;
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}
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level &= G_LOG_LEVEL_MASK;
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#ifndef _WIN32
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if (domain && strcmp(domain, "syslog") == 0) {
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syslog(LOG_INFO, "%s: %s", level_str, msg);
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} else if (level & s->log_level) {
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#else
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if (level & s->log_level) {
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#endif
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g_get_current_time(&time);
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fprintf(s->log_file,
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"%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
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fflush(s->log_file);
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}
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}
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void ga_set_response_delimited(GAState *s)
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{
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s->delimit_response = true;
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}
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#ifndef _WIN32
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static bool ga_open_pidfile(const char *pidfile)
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{
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int pidfd;
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char pidstr[32];
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pidfd = open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
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if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
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g_critical("Cannot lock pid file, %s", strerror(errno));
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if (pidfd != -1) {
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close(pidfd);
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}
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return false;
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}
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if (ftruncate(pidfd, 0) || lseek(pidfd, 0, SEEK_SET)) {
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g_critical("Failed to truncate pid file");
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goto fail;
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}
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snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
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if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
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g_critical("Failed to write pid file");
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goto fail;
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}
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return true;
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fail:
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unlink(pidfile);
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return false;
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}
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#else /* _WIN32 */
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static bool ga_open_pidfile(const char *pidfile)
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{
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return true;
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}
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#endif
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static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
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{
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return strcmp(str1, str2);
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}
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/* disable commands that aren't safe for fsfreeze */
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static void ga_disable_non_whitelisted(void)
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{
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char **list_head, **list;
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bool whitelisted;
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int i;
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list_head = list = qmp_get_command_list();
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while (*list != NULL) {
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whitelisted = false;
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i = 0;
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while (ga_freeze_whitelist[i] != NULL) {
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if (strcmp(*list, ga_freeze_whitelist[i]) == 0) {
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whitelisted = true;
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}
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i++;
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}
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if (!whitelisted) {
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g_debug("disabling command: %s", *list);
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qmp_disable_command(*list);
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}
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g_free(*list);
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list++;
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}
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g_free(list_head);
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}
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/* [re-]enable all commands, except those explicitly blacklisted by user */
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static void ga_enable_non_blacklisted(GList *blacklist)
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{
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char **list_head, **list;
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list_head = list = qmp_get_command_list();
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while (*list != NULL) {
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if (g_list_find_custom(blacklist, *list, ga_strcmp) == NULL &&
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!qmp_command_is_enabled(*list)) {
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g_debug("enabling command: %s", *list);
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qmp_enable_command(*list);
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}
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g_free(*list);
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list++;
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}
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g_free(list_head);
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}
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static bool ga_create_file(const char *path)
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{
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int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
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if (fd == -1) {
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g_warning("unable to open/create file %s: %s", path, strerror(errno));
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return false;
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}
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close(fd);
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return true;
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}
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static bool ga_delete_file(const char *path)
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{
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int ret = unlink(path);
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if (ret == -1) {
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g_warning("unable to delete file: %s: %s", path, strerror(errno));
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return false;
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}
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return true;
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}
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bool ga_is_frozen(GAState *s)
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{
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return s->frozen;
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}
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void ga_set_frozen(GAState *s)
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{
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if (ga_is_frozen(s)) {
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return;
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}
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/* disable all non-whitelisted (for frozen state) commands */
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ga_disable_non_whitelisted();
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g_warning("disabling logging due to filesystem freeze");
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ga_disable_logging(s);
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s->frozen = true;
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if (!ga_create_file(s->state_filepath_isfrozen)) {
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g_warning("unable to create %s, fsfreeze may not function properly",
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s->state_filepath_isfrozen);
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}
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}
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void ga_unset_frozen(GAState *s)
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{
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if (!ga_is_frozen(s)) {
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return;
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}
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/* if we delayed creation/opening of pid/log files due to being
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* in a frozen state at start up, do it now
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*/
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if (s->deferred_options.log_filepath) {
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s->log_file = fopen(s->deferred_options.log_filepath, "a");
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if (!s->log_file) {
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s->log_file = stderr;
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}
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s->deferred_options.log_filepath = NULL;
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}
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ga_enable_logging(s);
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g_warning("logging re-enabled due to filesystem unfreeze");
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if (s->deferred_options.pid_filepath) {
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if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
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g_warning("failed to create/open pid file");
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}
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s->deferred_options.pid_filepath = NULL;
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}
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/* enable all disabled, non-blacklisted commands */
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ga_enable_non_blacklisted(s->blacklist);
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s->frozen = false;
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if (!ga_delete_file(s->state_filepath_isfrozen)) {
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g_warning("unable to delete %s, fsfreeze may not function properly",
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s->state_filepath_isfrozen);
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}
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}
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static void become_daemon(const char *pidfile)
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{
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#ifndef _WIN32
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pid_t pid, sid;
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pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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if (pid > 0) {
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exit(EXIT_SUCCESS);
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}
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if (pidfile) {
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if (!ga_open_pidfile(pidfile)) {
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g_critical("failed to create pidfile");
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exit(EXIT_FAILURE);
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}
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}
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umask(0);
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sid = setsid();
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if (sid < 0) {
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goto fail;
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}
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if ((chdir("/")) < 0) {
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goto fail;
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}
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reopen_fd_to_null(STDIN_FILENO);
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reopen_fd_to_null(STDOUT_FILENO);
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reopen_fd_to_null(STDERR_FILENO);
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return;
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fail:
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if (pidfile) {
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unlink(pidfile);
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}
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g_critical("failed to daemonize");
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exit(EXIT_FAILURE);
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#endif
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}
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static int send_response(GAState *s, QObject *payload)
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{
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const char *buf;
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QString *payload_qstr, *response_qstr;
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GIOStatus status;
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g_assert(payload && s->channel);
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payload_qstr = qobject_to_json(payload);
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if (!payload_qstr) {
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return -EINVAL;
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}
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if (s->delimit_response) {
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s->delimit_response = false;
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response_qstr = qstring_new();
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qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
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qstring_append(response_qstr, qstring_get_str(payload_qstr));
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QDECREF(payload_qstr);
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} else {
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response_qstr = payload_qstr;
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}
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qstring_append_chr(response_qstr, '\n');
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buf = qstring_get_str(response_qstr);
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status = ga_channel_write_all(s->channel, buf, strlen(buf));
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QDECREF(response_qstr);
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if (status != G_IO_STATUS_NORMAL) {
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return -EIO;
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}
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return 0;
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}
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static void process_command(GAState *s, QDict *req)
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{
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QObject *rsp = NULL;
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int ret;
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g_assert(req);
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g_debug("processing command");
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rsp = qmp_dispatch(QOBJECT(req));
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if (rsp) {
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ret = send_response(s, rsp);
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if (ret) {
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g_warning("error sending response: %s", strerror(ret));
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}
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qobject_decref(rsp);
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}
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}
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/* handle requests/control events coming in over the channel */
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static void process_event(JSONMessageParser *parser, QList *tokens)
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{
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GAState *s = container_of(parser, GAState, parser);
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QObject *obj;
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QDict *qdict;
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Error *err = NULL;
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int ret;
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g_assert(s && parser);
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g_debug("process_event: called");
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obj = json_parser_parse_err(tokens, NULL, &err);
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if (err || !obj || qobject_type(obj) != QTYPE_QDICT) {
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qobject_decref(obj);
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qdict = qdict_new();
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if (!err) {
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g_warning("failed to parse event: unknown error");
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error_set(&err, QERR_JSON_PARSING);
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} else {
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g_warning("failed to parse event: %s", error_get_pretty(err));
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}
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qdict_put_obj(qdict, "error", qmp_build_error_object(err));
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error_free(err);
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} else {
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qdict = qobject_to_qdict(obj);
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}
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g_assert(qdict);
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/* handle host->guest commands */
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|
if (qdict_haskey(qdict, "execute")) {
|
|
process_command(s, qdict);
|
|
} else {
|
|
if (!qdict_haskey(qdict, "error")) {
|
|
QDECREF(qdict);
|
|
qdict = qdict_new();
|
|
g_warning("unrecognized payload format");
|
|
error_set(&err, QERR_UNSUPPORTED);
|
|
qdict_put_obj(qdict, "error", qmp_build_error_object(err));
|
|
error_free(err);
|
|
}
|
|
ret = send_response(s, QOBJECT(qdict));
|
|
if (ret) {
|
|
g_warning("error sending error response: %s", strerror(ret));
|
|
}
|
|
}
|
|
|
|
QDECREF(qdict);
|
|
}
|
|
|
|
/* false return signals GAChannel to close the current client connection */
|
|
static gboolean channel_event_cb(GIOCondition condition, gpointer data)
|
|
{
|
|
GAState *s = data;
|
|
gchar buf[QGA_READ_COUNT_DEFAULT+1];
|
|
gsize count;
|
|
GError *err = NULL;
|
|
GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
|
|
if (err != NULL) {
|
|
g_warning("error reading channel: %s", err->message);
|
|
g_error_free(err);
|
|
return false;
|
|
}
|
|
switch (status) {
|
|
case G_IO_STATUS_ERROR:
|
|
g_warning("error reading channel");
|
|
return false;
|
|
case G_IO_STATUS_NORMAL:
|
|
buf[count] = 0;
|
|
g_debug("read data, count: %d, data: %s", (int)count, buf);
|
|
json_message_parser_feed(&s->parser, (char *)buf, (int)count);
|
|
break;
|
|
case G_IO_STATUS_EOF:
|
|
g_debug("received EOF");
|
|
if (!s->virtio) {
|
|
return false;
|
|
}
|
|
case G_IO_STATUS_AGAIN:
|
|
/* virtio causes us to spin here when no process is attached to
|
|
* host-side chardev. sleep a bit to mitigate this
|
|
*/
|
|
if (s->virtio) {
|
|
usleep(100*1000);
|
|
}
|
|
return true;
|
|
default:
|
|
g_warning("unknown channel read status, closing");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
|
|
{
|
|
GAChannelMethod channel_method;
|
|
|
|
if (method == NULL) {
|
|
method = "virtio-serial";
|
|
}
|
|
|
|
if (path == NULL) {
|
|
if (strcmp(method, "virtio-serial") != 0) {
|
|
g_critical("must specify a path for this channel");
|
|
return false;
|
|
}
|
|
/* try the default path for the virtio-serial port */
|
|
path = QGA_VIRTIO_PATH_DEFAULT;
|
|
}
|
|
|
|
if (strcmp(method, "virtio-serial") == 0) {
|
|
s->virtio = true; /* virtio requires special handling in some cases */
|
|
channel_method = GA_CHANNEL_VIRTIO_SERIAL;
|
|
} else if (strcmp(method, "isa-serial") == 0) {
|
|
channel_method = GA_CHANNEL_ISA_SERIAL;
|
|
} else if (strcmp(method, "unix-listen") == 0) {
|
|
channel_method = GA_CHANNEL_UNIX_LISTEN;
|
|
} else {
|
|
g_critical("unsupported channel method/type: %s", method);
|
|
return false;
|
|
}
|
|
|
|
s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
|
|
if (!s->channel) {
|
|
g_critical("failed to create guest agent channel");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
|
|
LPVOID ctx)
|
|
{
|
|
DWORD ret = NO_ERROR;
|
|
GAService *service = &ga_state->service;
|
|
|
|
switch (ctrl)
|
|
{
|
|
case SERVICE_CONTROL_STOP:
|
|
case SERVICE_CONTROL_SHUTDOWN:
|
|
quit_handler(SIGTERM);
|
|
service->status.dwCurrentState = SERVICE_STOP_PENDING;
|
|
SetServiceStatus(service->status_handle, &service->status);
|
|
break;
|
|
|
|
default:
|
|
ret = ERROR_CALL_NOT_IMPLEMENTED;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
|
|
{
|
|
GAService *service = &ga_state->service;
|
|
|
|
service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
|
|
service_ctrl_handler, NULL);
|
|
|
|
if (service->status_handle == 0) {
|
|
g_critical("Failed to register extended requests function!\n");
|
|
return;
|
|
}
|
|
|
|
service->status.dwServiceType = SERVICE_WIN32;
|
|
service->status.dwCurrentState = SERVICE_RUNNING;
|
|
service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
|
|
service->status.dwWin32ExitCode = NO_ERROR;
|
|
service->status.dwServiceSpecificExitCode = NO_ERROR;
|
|
service->status.dwCheckPoint = 0;
|
|
service->status.dwWaitHint = 0;
|
|
SetServiceStatus(service->status_handle, &service->status);
|
|
|
|
g_main_loop_run(ga_state->main_loop);
|
|
|
|
service->status.dwCurrentState = SERVICE_STOPPED;
|
|
SetServiceStatus(service->status_handle, &service->status);
|
|
}
|
|
#endif
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
const char *sopt = "hVvdm:p:l:f:b:s:t:";
|
|
const char *method = NULL, *path = NULL;
|
|
const char *log_filepath = NULL;
|
|
const char *pid_filepath = QGA_PIDFILE_DEFAULT;
|
|
const char *state_dir = QGA_STATEDIR_DEFAULT;
|
|
#ifdef _WIN32
|
|
const char *service = NULL;
|
|
#endif
|
|
const struct option lopt[] = {
|
|
{ "help", 0, NULL, 'h' },
|
|
{ "version", 0, NULL, 'V' },
|
|
{ "logfile", 1, NULL, 'l' },
|
|
{ "pidfile", 1, NULL, 'f' },
|
|
{ "verbose", 0, NULL, 'v' },
|
|
{ "method", 1, NULL, 'm' },
|
|
{ "path", 1, NULL, 'p' },
|
|
{ "daemonize", 0, NULL, 'd' },
|
|
{ "blacklist", 1, NULL, 'b' },
|
|
#ifdef _WIN32
|
|
{ "service", 1, NULL, 's' },
|
|
#endif
|
|
{ "statedir", 1, NULL, 't' },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
int opt_ind = 0, ch, daemonize = 0, i, j, len;
|
|
GLogLevelFlags log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
|
|
GList *blacklist = NULL;
|
|
GAState *s;
|
|
|
|
module_call_init(MODULE_INIT_QAPI);
|
|
|
|
while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
|
|
switch (ch) {
|
|
case 'm':
|
|
method = optarg;
|
|
break;
|
|
case 'p':
|
|
path = optarg;
|
|
break;
|
|
case 'l':
|
|
log_filepath = optarg;
|
|
break;
|
|
case 'f':
|
|
pid_filepath = optarg;
|
|
break;
|
|
case 't':
|
|
state_dir = optarg;
|
|
break;
|
|
case 'v':
|
|
/* enable all log levels */
|
|
log_level = G_LOG_LEVEL_MASK;
|
|
break;
|
|
case 'V':
|
|
printf("QEMU Guest Agent %s\n", QEMU_VERSION);
|
|
return 0;
|
|
case 'd':
|
|
daemonize = 1;
|
|
break;
|
|
case 'b': {
|
|
char **list_head, **list;
|
|
if (is_help_option(optarg)) {
|
|
list_head = list = qmp_get_command_list();
|
|
while (*list != NULL) {
|
|
printf("%s\n", *list);
|
|
g_free(*list);
|
|
list++;
|
|
}
|
|
g_free(list_head);
|
|
return 0;
|
|
}
|
|
for (j = 0, i = 0, len = strlen(optarg); i < len; i++) {
|
|
if (optarg[i] == ',') {
|
|
optarg[i] = 0;
|
|
blacklist = g_list_append(blacklist, &optarg[j]);
|
|
j = i + 1;
|
|
}
|
|
}
|
|
if (j < i) {
|
|
blacklist = g_list_append(blacklist, &optarg[j]);
|
|
}
|
|
break;
|
|
}
|
|
#ifdef _WIN32
|
|
case 's':
|
|
service = optarg;
|
|
if (strcmp(service, "install") == 0) {
|
|
return ga_install_service(path, log_filepath);
|
|
} else if (strcmp(service, "uninstall") == 0) {
|
|
return ga_uninstall_service();
|
|
} else {
|
|
printf("Unknown service command.\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
break;
|
|
#endif
|
|
case 'h':
|
|
usage(argv[0]);
|
|
return 0;
|
|
case '?':
|
|
g_print("Unknown option, try '%s --help' for more information.\n",
|
|
argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
s = g_malloc0(sizeof(GAState));
|
|
s->log_level = log_level;
|
|
s->log_file = stderr;
|
|
g_log_set_default_handler(ga_log, s);
|
|
g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
|
|
ga_enable_logging(s);
|
|
s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
|
|
state_dir);
|
|
s->frozen = false;
|
|
#ifndef _WIN32
|
|
/* check if a previous instance of qemu-ga exited with filesystems' state
|
|
* marked as frozen. this could be a stale value (a non-qemu-ga process
|
|
* or reboot may have since unfrozen them), but better to require an
|
|
* uneeded unfreeze than to risk hanging on start-up
|
|
*/
|
|
struct stat st;
|
|
if (stat(s->state_filepath_isfrozen, &st) == -1) {
|
|
/* it's okay if the file doesn't exist, but if we can't access for
|
|
* some other reason, such as permissions, there's a configuration
|
|
* that needs to be addressed. so just bail now before we get into
|
|
* more trouble later
|
|
*/
|
|
if (errno != ENOENT) {
|
|
g_critical("unable to access state file at path %s: %s",
|
|
s->state_filepath_isfrozen, strerror(errno));
|
|
return EXIT_FAILURE;
|
|
}
|
|
} else {
|
|
g_warning("previous instance appears to have exited with frozen"
|
|
" filesystems. deferring logging/pidfile creation and"
|
|
" disabling non-fsfreeze-safe commands until"
|
|
" guest-fsfreeze-thaw is issued, or filesystems are"
|
|
" manually unfrozen and the file %s is removed",
|
|
s->state_filepath_isfrozen);
|
|
s->frozen = true;
|
|
}
|
|
#endif
|
|
|
|
if (ga_is_frozen(s)) {
|
|
if (daemonize) {
|
|
/* delay opening/locking of pidfile till filesystem are unfrozen */
|
|
s->deferred_options.pid_filepath = pid_filepath;
|
|
become_daemon(NULL);
|
|
}
|
|
if (log_filepath) {
|
|
/* delay opening the log file till filesystems are unfrozen */
|
|
s->deferred_options.log_filepath = log_filepath;
|
|
}
|
|
ga_disable_logging(s);
|
|
ga_disable_non_whitelisted();
|
|
} else {
|
|
if (daemonize) {
|
|
become_daemon(pid_filepath);
|
|
}
|
|
if (log_filepath) {
|
|
FILE *log_file = fopen(log_filepath, "a");
|
|
if (!log_file) {
|
|
g_critical("unable to open specified log file: %s",
|
|
strerror(errno));
|
|
goto out_bad;
|
|
}
|
|
s->log_file = log_file;
|
|
}
|
|
}
|
|
|
|
if (blacklist) {
|
|
s->blacklist = blacklist;
|
|
do {
|
|
g_debug("disabling command: %s", (char *)blacklist->data);
|
|
qmp_disable_command(blacklist->data);
|
|
blacklist = g_list_next(blacklist);
|
|
} while (blacklist);
|
|
}
|
|
s->command_state = ga_command_state_new();
|
|
ga_command_state_init(s, s->command_state);
|
|
ga_command_state_init_all(s->command_state);
|
|
json_message_parser_init(&s->parser, process_event);
|
|
ga_state = s;
|
|
#ifndef _WIN32
|
|
if (!register_signal_handlers()) {
|
|
g_critical("failed to register signal handlers");
|
|
goto out_bad;
|
|
}
|
|
#endif
|
|
|
|
s->main_loop = g_main_loop_new(NULL, false);
|
|
if (!channel_init(ga_state, method, path)) {
|
|
g_critical("failed to initialize guest agent channel");
|
|
goto out_bad;
|
|
}
|
|
#ifndef _WIN32
|
|
g_main_loop_run(ga_state->main_loop);
|
|
#else
|
|
if (daemonize) {
|
|
SERVICE_TABLE_ENTRY service_table[] = {
|
|
{ (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
|
|
StartServiceCtrlDispatcher(service_table);
|
|
} else {
|
|
g_main_loop_run(ga_state->main_loop);
|
|
}
|
|
#endif
|
|
|
|
ga_command_state_cleanup_all(ga_state->command_state);
|
|
ga_channel_free(ga_state->channel);
|
|
|
|
if (daemonize) {
|
|
unlink(pid_filepath);
|
|
}
|
|
return 0;
|
|
|
|
out_bad:
|
|
if (daemonize) {
|
|
unlink(pid_filepath);
|
|
}
|
|
return EXIT_FAILURE;
|
|
}
|