- Don't exit on errors if not requested. - Don't keep configuration in global variable, but allocate memory for configuration. - Call yyrestart() before yyparse() so that on error in configuration file we will start from the begining next time and not from the place we left of. MFC after: 1 month
535 lines
14 KiB
C
535 lines
14 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <libutil.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <activemap.h>
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#include <pjdlog.h>
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#include "control.h"
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#include "hast.h"
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#include "hast_proto.h"
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#include "hastd.h"
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#include "subr.h"
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/* Path to configuration file. */
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static const char *cfgpath = HAST_CONFIG;
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/* Hastd configuration. */
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static struct hastd_config *cfg;
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/* Was SIGCHLD signal received? */
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static bool sigchld_received = false;
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/* Was SIGHUP signal received? */
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static bool sighup_received = false;
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/* Was SIGINT or SIGTERM signal received? */
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bool sigexit_received = false;
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/* PID file handle. */
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struct pidfh *pfh;
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static void
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usage(void)
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{
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errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]");
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}
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static void
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sighandler(int sig)
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{
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switch (sig) {
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case SIGCHLD:
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sigchld_received = true;
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break;
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case SIGHUP:
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sighup_received = true;
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break;
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default:
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assert(!"invalid condition");
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}
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}
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static void
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g_gate_load(void)
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{
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if (modfind("g_gate") == -1) {
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/* Not present in kernel, try loading it. */
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if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) {
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if (errno != EEXIST) {
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pjdlog_exit(EX_OSERR,
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"Unable to load geom_gate module");
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}
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}
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}
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}
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static void
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child_exit_log(unsigned int pid, int status)
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{
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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pjdlog_debug(1, "Worker process exited gracefully (pid=%u).",
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pid);
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} else if (WIFSIGNALED(status)) {
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pjdlog_error("Worker process killed (pid=%u, signal=%d).",
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pid, WTERMSIG(status));
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} else {
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pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).",
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pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1);
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}
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}
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static void
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child_exit(void)
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{
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struct hast_resource *res;
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int status;
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pid_t pid;
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while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
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/* Find resource related to the process that just exited. */
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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if (pid == res->hr_workerpid)
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break;
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}
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if (res == NULL) {
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/*
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* This can happen when new connection arrives and we
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* cancel child responsible for the old one.
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*/
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continue;
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}
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pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
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role2str(res->hr_role));
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child_exit_log(pid, status);
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proto_close(res->hr_ctrl);
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res->hr_workerpid = 0;
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if (res->hr_role == HAST_ROLE_PRIMARY) {
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/*
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* Restart child process if it was killed by signal
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* or exited because of temporary problem.
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*/
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if (WIFSIGNALED(status) ||
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(WIFEXITED(status) &&
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WEXITSTATUS(status) == EX_TEMPFAIL)) {
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sleep(1);
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pjdlog_info("Restarting worker process.");
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hastd_primary(res);
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} else {
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res->hr_role = HAST_ROLE_INIT;
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pjdlog_info("Changing resource role back to %s.",
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role2str(res->hr_role));
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}
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}
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pjdlog_prefix_set("%s", "");
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}
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}
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static void
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hastd_reload(void)
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{
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/* TODO */
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pjdlog_warning("Configuration reload is not implemented.");
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}
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static void
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listen_accept(void)
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{
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struct hast_resource *res;
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struct proto_conn *conn;
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struct nv *nvin, *nvout, *nverr;
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const char *resname;
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const unsigned char *token;
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char laddr[256], raddr[256];
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size_t size;
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pid_t pid;
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int status;
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proto_local_address(cfg->hc_listenconn, laddr, sizeof(laddr));
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pjdlog_debug(1, "Accepting connection to %s.", laddr);
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if (proto_accept(cfg->hc_listenconn, &conn) < 0) {
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pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr);
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return;
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}
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proto_local_address(conn, laddr, sizeof(laddr));
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proto_remote_address(conn, raddr, sizeof(raddr));
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pjdlog_info("Connection from %s to %s.", raddr, laddr);
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/* Error in setting timeout is not critical, but why should it fail? */
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if (proto_timeout(conn, HAST_TIMEOUT) < 0)
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pjdlog_errno(LOG_WARNING, "Unable to set connection timeout");
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nvin = nvout = nverr = NULL;
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/*
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* Before receiving any data see if remote host have access to any
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* resource.
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*/
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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if (proto_address_match(conn, res->hr_remoteaddr))
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break;
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}
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if (res == NULL) {
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pjdlog_error("Client %s isn't known.", raddr);
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goto close;
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}
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/* Ok, remote host can access at least one resource. */
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if (hast_proto_recv_hdr(conn, &nvin) < 0) {
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pjdlog_errno(LOG_ERR, "Unable to receive header from %s",
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raddr);
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goto close;
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}
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resname = nv_get_string(nvin, "resource");
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if (resname == NULL) {
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pjdlog_error("No 'resource' field in the header received from %s.",
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raddr);
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goto close;
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}
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pjdlog_debug(2, "%s: resource=%s", raddr, resname);
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token = nv_get_uint8_array(nvin, &size, "token");
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/*
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* NULL token means that this is first conection.
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*/
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if (token != NULL && size != sizeof(res->hr_token)) {
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pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).",
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raddr, sizeof(res->hr_token), size);
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goto close;
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}
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/*
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* From now on we want to send errors to the remote node.
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*/
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nverr = nv_alloc();
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/* Find resource related to this connection. */
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TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
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if (strcmp(resname, res->hr_name) == 0)
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break;
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}
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/* Have we found the resource? */
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if (res == NULL) {
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pjdlog_error("No resource '%s' as requested by %s.",
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resname, raddr);
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nv_add_stringf(nverr, "errmsg", "Resource not configured.");
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goto fail;
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}
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/* Now that we know resource name setup log prefix. */
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pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
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/* Does the remote host have access to this resource? */
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if (!proto_address_match(conn, res->hr_remoteaddr)) {
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pjdlog_error("Client %s has no access to the resource.", raddr);
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nv_add_stringf(nverr, "errmsg", "No access to the resource.");
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goto fail;
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}
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/* Is the resource marked as secondary? */
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if (res->hr_role != HAST_ROLE_SECONDARY) {
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pjdlog_error("We act as %s for the resource and not as %s as requested by %s.",
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role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY),
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raddr);
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nv_add_stringf(nverr, "errmsg",
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"Remote node acts as %s for the resource and not as %s.",
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role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY));
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goto fail;
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}
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/* Does token (if exists) match? */
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if (token != NULL && memcmp(token, res->hr_token,
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sizeof(res->hr_token)) != 0) {
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pjdlog_error("Token received from %s doesn't match.", raddr);
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nv_add_stringf(nverr, "errmsg", "Token doesn't match.");
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goto fail;
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}
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/*
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* If there is no token, but we have half-open connection
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* (only remotein) or full connection (worker process is running)
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* we have to cancel those and accept the new connection.
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*/
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if (token == NULL) {
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assert(res->hr_remoteout == NULL);
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pjdlog_debug(1, "Initial connection from %s.", raddr);
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if (res->hr_workerpid != 0) {
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assert(res->hr_remotein == NULL);
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pjdlog_debug(1,
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"Worker process exists (pid=%u), stopping it.",
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(unsigned int)res->hr_workerpid);
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/* Stop child process. */
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if (kill(res->hr_workerpid, SIGINT) < 0) {
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pjdlog_errno(LOG_ERR,
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"Unable to stop worker process (pid=%u)",
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(unsigned int)res->hr_workerpid);
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/*
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* Other than logging the problem we
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* ignore it - nothing smart to do.
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*/
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}
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/* Wait for it to exit. */
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else if ((pid = waitpid(res->hr_workerpid,
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&status, 0)) != res->hr_workerpid) {
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/* We can only log the problem. */
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pjdlog_errno(LOG_ERR,
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"Waiting for worker process (pid=%u) failed",
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(unsigned int)res->hr_workerpid);
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} else {
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child_exit_log(res->hr_workerpid, status);
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}
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res->hr_workerpid = 0;
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} else if (res->hr_remotein != NULL) {
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char oaddr[256];
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proto_remote_address(conn, oaddr, sizeof(oaddr));
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pjdlog_debug(1,
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"Canceling half-open connection from %s on connection from %s.",
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oaddr, raddr);
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proto_close(res->hr_remotein);
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res->hr_remotein = NULL;
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}
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}
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/*
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* Checks and cleanups are done.
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*/
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if (token == NULL) {
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arc4random_buf(res->hr_token, sizeof(res->hr_token));
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nvout = nv_alloc();
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nv_add_uint8_array(nvout, res->hr_token,
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sizeof(res->hr_token), "token");
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if (nv_error(nvout) != 0) {
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pjdlog_common(LOG_ERR, 0, nv_error(nvout),
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"Unable to prepare return header for %s", raddr);
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nv_add_stringf(nverr, "errmsg",
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"Remote node was unable to prepare return header: %s.",
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strerror(nv_error(nvout)));
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goto fail;
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}
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if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) {
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int error = errno;
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pjdlog_errno(LOG_ERR, "Unable to send response to %s",
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raddr);
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nv_add_stringf(nverr, "errmsg",
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"Remote node was unable to send response: %s.",
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strerror(error));
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goto fail;
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}
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res->hr_remotein = conn;
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pjdlog_debug(1, "Incoming connection from %s configured.",
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raddr);
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} else {
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res->hr_remoteout = conn;
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pjdlog_debug(1, "Outgoing connection to %s configured.", raddr);
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hastd_secondary(res, nvin);
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}
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nv_free(nvin);
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nv_free(nvout);
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nv_free(nverr);
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pjdlog_prefix_set("%s", "");
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return;
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fail:
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if (nv_error(nverr) != 0) {
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pjdlog_common(LOG_ERR, 0, nv_error(nverr),
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"Unable to prepare error header for %s", raddr);
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goto close;
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}
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if (hast_proto_send(NULL, conn, nverr, NULL, 0) < 0) {
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pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr);
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goto close;
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}
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close:
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if (nvin != NULL)
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nv_free(nvin);
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if (nvout != NULL)
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nv_free(nvout);
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if (nverr != NULL)
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nv_free(nverr);
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proto_close(conn);
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pjdlog_prefix_set("%s", "");
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}
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static void
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main_loop(void)
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{
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fd_set rfds, wfds;
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int cfd, lfd, maxfd, ret;
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cfd = proto_descriptor(cfg->hc_controlconn);
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lfd = proto_descriptor(cfg->hc_listenconn);
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maxfd = cfd > lfd ? cfd : lfd;
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for (;;) {
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if (sigchld_received) {
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sigchld_received = false;
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child_exit();
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}
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if (sighup_received) {
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sighup_received = false;
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hastd_reload();
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}
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/* Setup descriptors for select(2). */
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FD_ZERO(&rfds);
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FD_SET(cfd, &rfds);
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FD_SET(lfd, &rfds);
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FD_ZERO(&wfds);
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FD_SET(cfd, &wfds);
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FD_SET(lfd, &wfds);
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ret = select(maxfd + 1, &rfds, &wfds, NULL, NULL);
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if (ret == -1) {
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if (errno == EINTR)
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continue;
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KEEP_ERRNO((void)pidfile_remove(pfh));
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pjdlog_exit(EX_OSERR, "select() failed");
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}
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if (FD_ISSET(cfd, &rfds) || FD_ISSET(cfd, &wfds))
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control_handle(cfg);
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if (FD_ISSET(lfd, &rfds) || FD_ISSET(lfd, &wfds))
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listen_accept();
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}
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}
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|
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int
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main(int argc, char *argv[])
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{
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const char *pidfile;
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pid_t otherpid;
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bool foreground;
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int debuglevel;
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g_gate_load();
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foreground = false;
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debuglevel = 0;
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pidfile = HASTD_PIDFILE;
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for (;;) {
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int ch;
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ch = getopt(argc, argv, "c:dFhP:");
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if (ch == -1)
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break;
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switch (ch) {
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case 'c':
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cfgpath = optarg;
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break;
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case 'd':
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debuglevel++;
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break;
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case 'F':
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foreground = true;
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break;
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|
case 'P':
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pidfile = optarg;
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break;
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|
case 'h':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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pjdlog_debug_set(debuglevel);
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pfh = pidfile_open(pidfile, 0600, &otherpid);
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if (pfh == NULL) {
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if (errno == EEXIST) {
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pjdlog_exitx(EX_TEMPFAIL,
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"Another hastd is already running, pid: %jd.",
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(intmax_t)otherpid);
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}
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/* If we cannot create pidfile from other reasons, only warn. */
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pjdlog_errno(LOG_WARNING, "Unable to open or create pidfile");
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}
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cfg = yy_config_parse(cfgpath, true);
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assert(cfg != NULL);
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signal(SIGHUP, sighandler);
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signal(SIGCHLD, sighandler);
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/* Listen on control address. */
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if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) < 0) {
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KEEP_ERRNO((void)pidfile_remove(pfh));
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pjdlog_exit(EX_OSERR, "Unable to listen on control address %s",
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cfg->hc_controladdr);
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}
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/* Listen for remote connections. */
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if (proto_server(cfg->hc_listenaddr, &cfg->hc_listenconn) < 0) {
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KEEP_ERRNO((void)pidfile_remove(pfh));
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pjdlog_exit(EX_OSERR, "Unable to listen on address %s",
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cfg->hc_listenaddr);
|
|
}
|
|
|
|
if (!foreground) {
|
|
if (daemon(0, 0) < 0) {
|
|
KEEP_ERRNO((void)pidfile_remove(pfh));
|
|
pjdlog_exit(EX_OSERR, "Unable to daemonize");
|
|
}
|
|
|
|
/* Start logging to syslog. */
|
|
pjdlog_mode_set(PJDLOG_MODE_SYSLOG);
|
|
|
|
/* Write PID to a file. */
|
|
if (pidfile_write(pfh) < 0) {
|
|
pjdlog_errno(LOG_WARNING,
|
|
"Unable to write PID to a file");
|
|
}
|
|
}
|
|
|
|
main_loop();
|
|
|
|
exit(0);
|
|
}
|