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freebsd-skq/sbin/hastd/hastd.c
Pawel Jakub Dawidek bd738d630c Allow to specify pidfile in HAST configuration file. 
MFC after:	1 week
2011-10-17 12:22:09 +00:00

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/*-
* Copyright (c) 2009-2010 The FreeBSD Foundation
* Copyright (c) 2010-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <libutil.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#include <activemap.h>
#include <pjdlog.h>
#include "control.h"
#include "event.h"
#include "hast.h"
#include "hast_proto.h"
#include "hastd.h"
#include "hooks.h"
#include "subr.h"
/* Path to configuration file. */
const char *cfgpath = HAST_CONFIG;
/* Hastd configuration. */
static struct hastd_config *cfg;
/* Was SIGINT or SIGTERM signal received? */
bool sigexit_received = false;
/* PID file handle. */
struct pidfh *pfh;
/* How often check for hooks running for too long. */
#define REPORT_INTERVAL 5
static void
usage(void)
{
errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]");
}
static void
g_gate_load(void)
{
if (modfind("g_gate") == -1) {
/* Not present in kernel, try loading it. */
if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) {
if (errno != EEXIST) {
pjdlog_exit(EX_OSERR,
"Unable to load geom_gate module");
}
}
}
}
void
descriptors_cleanup(struct hast_resource *res)
{
struct hast_resource *tres;
struct hastd_listen *lst;
TAILQ_FOREACH(tres, &cfg->hc_resources, hr_next) {
if (tres == res) {
PJDLOG_VERIFY(res->hr_role == HAST_ROLE_SECONDARY ||
(res->hr_remotein == NULL &&
res->hr_remoteout == NULL));
continue;
}
if (tres->hr_remotein != NULL)
proto_close(tres->hr_remotein);
if (tres->hr_remoteout != NULL)
proto_close(tres->hr_remoteout);
if (tres->hr_ctrl != NULL)
proto_close(tres->hr_ctrl);
if (tres->hr_event != NULL)
proto_close(tres->hr_event);
if (tres->hr_conn != NULL)
proto_close(tres->hr_conn);
}
if (cfg->hc_controlin != NULL)
proto_close(cfg->hc_controlin);
proto_close(cfg->hc_controlconn);
TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
if (lst->hl_conn != NULL)
proto_close(lst->hl_conn);
}
(void)pidfile_close(pfh);
hook_fini();
pjdlog_fini();
}
static const char *
dtype2str(mode_t mode)
{
if (S_ISBLK(mode))
return ("block device");
else if (S_ISCHR(mode))
return ("character device");
else if (S_ISDIR(mode))
return ("directory");
else if (S_ISFIFO(mode))
return ("pipe or FIFO");
else if (S_ISLNK(mode))
return ("symbolic link");
else if (S_ISREG(mode))
return ("regular file");
else if (S_ISSOCK(mode))
return ("socket");
else if (S_ISWHT(mode))
return ("whiteout");
else
return ("unknown");
}
void
descriptors_assert(const struct hast_resource *res, int pjdlogmode)
{
char msg[256];
struct stat sb;
long maxfd;
bool isopen;
mode_t mode;
int fd;
/*
* At this point descriptor to syslog socket is closed, so if we want
* to log assertion message, we have to first store it in 'msg' local
* buffer and then open syslog socket and log it.
*/
msg[0] = '\0';
maxfd = sysconf(_SC_OPEN_MAX);
if (maxfd < 0) {
pjdlog_init(pjdlogmode);
pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
role2str(res->hr_role));
pjdlog_errno(LOG_WARNING, "sysconf(_SC_OPEN_MAX) failed");
pjdlog_fini();
maxfd = 16384;
}
for (fd = 0; fd <= maxfd; fd++) {
if (fstat(fd, &sb) == 0) {
isopen = true;
mode = sb.st_mode;
} else if (errno == EBADF) {
isopen = false;
mode = 0;
} else {
(void)snprintf(msg, sizeof(msg),
"Unable to fstat descriptor %d: %s", fd,
strerror(errno));
break;
}
if (fd == STDIN_FILENO || fd == STDOUT_FILENO ||
fd == STDERR_FILENO) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (%s) is closed, but should be open.",
fd, (fd == STDIN_FILENO ? "stdin" :
(fd == STDOUT_FILENO ? "stdout" : "stderr")));
break;
}
} else if (fd == proto_descriptor(res->hr_event)) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (event) is closed, but should be open.",
fd);
break;
}
if (!S_ISSOCK(mode)) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (event) is %s, but should be %s.",
fd, dtype2str(mode), dtype2str(S_IFSOCK));
break;
}
} else if (fd == proto_descriptor(res->hr_ctrl)) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (ctrl) is closed, but should be open.",
fd);
break;
}
if (!S_ISSOCK(mode)) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (ctrl) is %s, but should be %s.",
fd, dtype2str(mode), dtype2str(S_IFSOCK));
break;
}
} else if (res->hr_role == HAST_ROLE_PRIMARY &&
fd == proto_descriptor(res->hr_conn)) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (conn) is closed, but should be open.",
fd);
break;
}
if (!S_ISSOCK(mode)) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (conn) is %s, but should be %s.",
fd, dtype2str(mode), dtype2str(S_IFSOCK));
break;
}
} else if (res->hr_role == HAST_ROLE_SECONDARY &&
res->hr_conn != NULL &&
fd == proto_descriptor(res->hr_conn)) {
if (isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (conn) is open, but should be closed.",
fd);
break;
}
} else if (res->hr_role == HAST_ROLE_SECONDARY &&
fd == proto_descriptor(res->hr_remotein)) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (remote in) is closed, but should be open.",
fd);
break;
}
if (!S_ISSOCK(mode)) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (remote in) is %s, but should be %s.",
fd, dtype2str(mode), dtype2str(S_IFSOCK));
break;
}
} else if (res->hr_role == HAST_ROLE_SECONDARY &&
fd == proto_descriptor(res->hr_remoteout)) {
if (!isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (remote out) is closed, but should be open.",
fd);
break;
}
if (!S_ISSOCK(mode)) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d (remote out) is %s, but should be %s.",
fd, dtype2str(mode), dtype2str(S_IFSOCK));
break;
}
} else {
if (isopen) {
(void)snprintf(msg, sizeof(msg),
"Descriptor %d is open (%s), but should be closed.",
fd, dtype2str(mode));
break;
}
}
}
if (msg[0] != '\0') {
pjdlog_init(pjdlogmode);
pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
role2str(res->hr_role));
PJDLOG_ABORT("%s", msg);
}
}
static void
child_exit_log(unsigned int pid, int status)
{
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
pjdlog_debug(1, "Worker process exited gracefully (pid=%u).",
pid);
} else if (WIFSIGNALED(status)) {
pjdlog_error("Worker process killed (pid=%u, signal=%d).",
pid, WTERMSIG(status));
} else {
pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).",
pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1);
}
}
static void
child_exit(void)
{
struct hast_resource *res;
int status;
pid_t pid;
while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
/* Find resource related to the process that just exited. */
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (pid == res->hr_workerpid)
break;
}
if (res == NULL) {
/*
* This can happen when new connection arrives and we
* cancel child responsible for the old one or if this
* was hook which we executed.
*/
hook_check_one(pid, status);
continue;
}
pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
role2str(res->hr_role));
child_exit_log(pid, status);
child_cleanup(res);
if (res->hr_role == HAST_ROLE_PRIMARY) {
/*
* Restart child process if it was killed by signal
* or exited because of temporary problem.
*/
if (WIFSIGNALED(status) ||
(WIFEXITED(status) &&
WEXITSTATUS(status) == EX_TEMPFAIL)) {
sleep(1);
pjdlog_info("Restarting worker process.");
hastd_primary(res);
} else {
res->hr_role = HAST_ROLE_INIT;
pjdlog_info("Changing resource role back to %s.",
role2str(res->hr_role));
}
}
pjdlog_prefix_set("%s", "");
}
}
static bool
resource_needs_restart(const struct hast_resource *res0,
const struct hast_resource *res1)
{
PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
if (strcmp(res0->hr_provname, res1->hr_provname) != 0)
return (true);
if (strcmp(res0->hr_localpath, res1->hr_localpath) != 0)
return (true);
if (res0->hr_role == HAST_ROLE_INIT ||
res0->hr_role == HAST_ROLE_SECONDARY) {
if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
return (true);
if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
return (true);
if (res0->hr_replication != res1->hr_replication)
return (true);
if (res0->hr_checksum != res1->hr_checksum)
return (true);
if (res0->hr_compression != res1->hr_compression)
return (true);
if (res0->hr_timeout != res1->hr_timeout)
return (true);
if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
return (true);
/*
* When metaflush has changed we don't really need restart,
* but it is just easier this way.
*/
if (res0->hr_metaflush != res1->hr_metaflush)
return (true);
}
return (false);
}
static bool
resource_needs_reload(const struct hast_resource *res0,
const struct hast_resource *res1)
{
PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
PJDLOG_ASSERT(strcmp(res0->hr_provname, res1->hr_provname) == 0);
PJDLOG_ASSERT(strcmp(res0->hr_localpath, res1->hr_localpath) == 0);
if (res0->hr_role != HAST_ROLE_PRIMARY)
return (false);
if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
return (true);
if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
return (true);
if (res0->hr_replication != res1->hr_replication)
return (true);
if (res0->hr_checksum != res1->hr_checksum)
return (true);
if (res0->hr_compression != res1->hr_compression)
return (true);
if (res0->hr_timeout != res1->hr_timeout)
return (true);
if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
return (true);
if (res0->hr_metaflush != res1->hr_metaflush)
return (true);
return (false);
}
static void
resource_reload(const struct hast_resource *res)
{
struct nv *nvin, *nvout;
int error;
PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
nvout = nv_alloc();
nv_add_uint8(nvout, CONTROL_RELOAD, "cmd");
nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr");
nv_add_string(nvout, res->hr_sourceaddr, "sourceaddr");
nv_add_int32(nvout, (int32_t)res->hr_replication, "replication");
nv_add_int32(nvout, (int32_t)res->hr_checksum, "checksum");
nv_add_int32(nvout, (int32_t)res->hr_compression, "compression");
nv_add_int32(nvout, (int32_t)res->hr_timeout, "timeout");
nv_add_string(nvout, res->hr_exec, "exec");
nv_add_int32(nvout, (int32_t)res->hr_metaflush, "metaflush");
if (nv_error(nvout) != 0) {
nv_free(nvout);
pjdlog_error("Unable to allocate header for reload message.");
return;
}
if (hast_proto_send(res, res->hr_ctrl, nvout, NULL, 0) < 0) {
pjdlog_errno(LOG_ERR, "Unable to send reload message");
nv_free(nvout);
return;
}
nv_free(nvout);
/* Receive response. */
if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) < 0) {
pjdlog_errno(LOG_ERR, "Unable to receive reload reply");
return;
}
error = nv_get_int16(nvin, "error");
nv_free(nvin);
if (error != 0) {
pjdlog_common(LOG_ERR, 0, error, "Reload failed");
return;
}
}
static void
hastd_reload(void)
{
struct hastd_config *newcfg;
struct hast_resource *nres, *cres, *tres;
struct hastd_listen *nlst, *clst;
struct pidfh *newpfh;
unsigned int nlisten;
uint8_t role;
pid_t otherpid;
pjdlog_info("Reloading configuration...");
newpfh = NULL;
newcfg = yy_config_parse(cfgpath, false);
if (newcfg == NULL)
goto failed;
/*
* Check if control address has changed.
*/
if (strcmp(cfg->hc_controladdr, newcfg->hc_controladdr) != 0) {
if (proto_server(newcfg->hc_controladdr,
&newcfg->hc_controlconn) < 0) {
pjdlog_errno(LOG_ERR,
"Unable to listen on control address %s",
newcfg->hc_controladdr);
goto failed;
}
}
/*
* Check if any listen address has changed.
*/
nlisten = 0;
TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
break;
}
if (clst != NULL && clst->hl_conn != NULL) {
pjdlog_info("Keep listening on address %s.",
nlst->hl_addr);
nlst->hl_conn = clst->hl_conn;
nlisten++;
} else if (proto_server(nlst->hl_addr, &nlst->hl_conn) == 0) {
pjdlog_info("Listening on new address %s.",
nlst->hl_addr);
nlisten++;
} else {
pjdlog_errno(LOG_WARNING,
"Unable to listen on address %s", nlst->hl_addr);
}
}
if (nlisten == 0) {
pjdlog_error("No addresses to listen on.");
goto failed;
}
/*
* Check if pidfile's path has changed.
*/
if (strcmp(cfg->hc_pidfile, newcfg->hc_pidfile) != 0) {
newpfh = pidfile_open(newcfg->hc_pidfile, 0600, &otherpid);
if (newpfh == NULL) {
if (errno == EEXIST) {
pjdlog_errno(LOG_WARNING,
"Another hastd is already running, pidfile: %s, pid: %jd.",
newcfg->hc_pidfile, (intmax_t)otherpid);
} else {
pjdlog_errno(LOG_WARNING,
"Unable to open or create pidfile %s",
newcfg->hc_pidfile);
}
} else if (pidfile_write(newpfh) < 0) {
/* Write PID to a file. */
pjdlog_errno(LOG_WARNING,
"Unable to write PID to file %s",
newcfg->hc_pidfile);
} else {
pjdlog_debug(1, "PID stored in %s.",
newcfg->hc_pidfile);
}
}
/* No failures from now on. */
/*
* Switch to new control socket.
*/
if (newcfg->hc_controlconn != NULL) {
pjdlog_info("Control socket changed from %s to %s.",
cfg->hc_controladdr, newcfg->hc_controladdr);
proto_close(cfg->hc_controlconn);
cfg->hc_controlconn = newcfg->hc_controlconn;
newcfg->hc_controlconn = NULL;
strlcpy(cfg->hc_controladdr, newcfg->hc_controladdr,
sizeof(cfg->hc_controladdr));
}
/*
* Switch to new pidfile.
*/
(void)pidfile_remove(pfh);
pfh = newpfh;
(void)strlcpy(cfg->hc_pidfile, newcfg->hc_pidfile,
sizeof(cfg->hc_pidfile));
/*
* Switch to new listen addresses. Close all that were removed.
*/
while ((clst = TAILQ_FIRST(&cfg->hc_listen)) != NULL) {
TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
break;
}
if (nlst == NULL && clst->hl_conn != NULL) {
proto_close(clst->hl_conn);
pjdlog_info("No longer listening on address %s.",
clst->hl_addr);
}
TAILQ_REMOVE(&cfg->hc_listen, clst, hl_next);
free(clst);
}
TAILQ_CONCAT(&cfg->hc_listen, &newcfg->hc_listen, hl_next);
/*
* Stop and remove resources that were removed from the configuration.
*/
TAILQ_FOREACH_SAFE(cres, &cfg->hc_resources, hr_next, tres) {
TAILQ_FOREACH(nres, &newcfg->hc_resources, hr_next) {
if (strcmp(cres->hr_name, nres->hr_name) == 0)
break;
}
if (nres == NULL) {
control_set_role(cres, HAST_ROLE_INIT);
TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
pjdlog_info("Resource %s removed.", cres->hr_name);
free(cres);
}
}
/*
* Move new resources to the current configuration.
*/
TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
if (strcmp(cres->hr_name, nres->hr_name) == 0)
break;
}
if (cres == NULL) {
TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
pjdlog_info("Resource %s added.", nres->hr_name);
}
}
/*
* Deal with modified resources.
* Depending on what has changed exactly we might want to perform
* different actions.
*
* We do full resource restart in the following situations:
* Resource role is INIT or SECONDARY.
* Resource role is PRIMARY and path to local component or provider
* name has changed.
* In case of PRIMARY, the worker process will be killed and restarted,
* which also means removing /dev/hast/<name> provider and
* recreating it.
*
* We do just reload (send SIGHUP to worker process) if we act as
* PRIMARY, but only if remote address, source address, replication
* mode, timeout, execution path or metaflush has changed.
* For those, there is no need to restart worker process.
* If PRIMARY receives SIGHUP, it will reconnect if remote address or
* source address has changed or it will set new timeout if only timeout
* has changed or it will update metaflush if only metaflush has
* changed.
*/
TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
if (strcmp(cres->hr_name, nres->hr_name) == 0)
break;
}
PJDLOG_ASSERT(cres != NULL);
if (resource_needs_restart(cres, nres)) {
pjdlog_info("Resource %s configuration was modified, restarting it.",
cres->hr_name);
role = cres->hr_role;
control_set_role(cres, HAST_ROLE_INIT);
TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
free(cres);
TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
control_set_role(nres, role);
} else if (resource_needs_reload(cres, nres)) {
pjdlog_info("Resource %s configuration was modified, reloading it.",
cres->hr_name);
strlcpy(cres->hr_remoteaddr, nres->hr_remoteaddr,
sizeof(cres->hr_remoteaddr));
strlcpy(cres->hr_sourceaddr, nres->hr_sourceaddr,
sizeof(cres->hr_sourceaddr));
cres->hr_replication = nres->hr_replication;
cres->hr_checksum = nres->hr_checksum;
cres->hr_compression = nres->hr_compression;
cres->hr_timeout = nres->hr_timeout;
strlcpy(cres->hr_exec, nres->hr_exec,
sizeof(cres->hr_exec));
cres->hr_metaflush = nres->hr_metaflush;
if (cres->hr_workerpid != 0)
resource_reload(cres);
}
}
yy_config_free(newcfg);
pjdlog_info("Configuration reloaded successfully.");
return;
failed:
if (newcfg != NULL) {
if (newcfg->hc_controlconn != NULL)
proto_close(newcfg->hc_controlconn);
while ((nlst = TAILQ_FIRST(&newcfg->hc_listen)) != NULL) {
if (nlst->hl_conn != NULL) {
TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
if (strcmp(nlst->hl_addr,
clst->hl_addr) == 0) {
break;
}
}
if (clst == NULL || clst->hl_conn == NULL)
proto_close(nlst->hl_conn);
}
TAILQ_REMOVE(&newcfg->hc_listen, nlst, hl_next);
free(nlst);
}
yy_config_free(newcfg);
}
if (newpfh != NULL)
(void)pidfile_remove(newpfh);
pjdlog_warning("Configuration not reloaded.");
}
static void
terminate_workers(void)
{
struct hast_resource *res;
pjdlog_info("Termination signal received, exiting.");
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (res->hr_workerpid == 0)
continue;
pjdlog_info("Terminating worker process (resource=%s, role=%s, pid=%u).",
res->hr_name, role2str(res->hr_role), res->hr_workerpid);
if (kill(res->hr_workerpid, SIGTERM) == 0)
continue;
pjdlog_errno(LOG_WARNING,
"Unable to send signal to worker process (resource=%s, role=%s, pid=%u).",
res->hr_name, role2str(res->hr_role), res->hr_workerpid);
}
}
static void
listen_accept(struct hastd_listen *lst)
{
struct hast_resource *res;
struct proto_conn *conn;
struct nv *nvin, *nvout, *nverr;
const char *resname;
const unsigned char *token;
char laddr[256], raddr[256];
size_t size;
pid_t pid;
int status;
proto_local_address(lst->hl_conn, laddr, sizeof(laddr));
pjdlog_debug(1, "Accepting connection to %s.", laddr);
if (proto_accept(lst->hl_conn, &conn) < 0) {
pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr);
return;
}
proto_local_address(conn, laddr, sizeof(laddr));
proto_remote_address(conn, raddr, sizeof(raddr));
pjdlog_info("Connection from %s to %s.", raddr, laddr);
/* Error in setting timeout is not critical, but why should it fail? */
if (proto_timeout(conn, HAST_TIMEOUT) < 0)
pjdlog_errno(LOG_WARNING, "Unable to set connection timeout");
nvin = nvout = nverr = NULL;
/*
* Before receiving any data see if remote host have access to any
* resource.
*/
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (proto_address_match(conn, res->hr_remoteaddr))
break;
}
if (res == NULL) {
pjdlog_error("Client %s isn't known.", raddr);
goto close;
}
/* Ok, remote host can access at least one resource. */
if (hast_proto_recv_hdr(conn, &nvin) < 0) {
pjdlog_errno(LOG_ERR, "Unable to receive header from %s",
raddr);
goto close;
}
resname = nv_get_string(nvin, "resource");
if (resname == NULL) {
pjdlog_error("No 'resource' field in the header received from %s.",
raddr);
goto close;
}
pjdlog_debug(2, "%s: resource=%s", raddr, resname);
token = nv_get_uint8_array(nvin, &size, "token");
/*
* NULL token means that this is first conection.
*/
if (token != NULL && size != sizeof(res->hr_token)) {
pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).",
raddr, sizeof(res->hr_token), size);
goto close;
}
/*
* From now on we want to send errors to the remote node.
*/
nverr = nv_alloc();
/* Find resource related to this connection. */
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (strcmp(resname, res->hr_name) == 0)
break;
}
/* Have we found the resource? */
if (res == NULL) {
pjdlog_error("No resource '%s' as requested by %s.",
resname, raddr);
nv_add_stringf(nverr, "errmsg", "Resource not configured.");
goto fail;
}
/* Now that we know resource name setup log prefix. */
pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
/* Does the remote host have access to this resource? */
if (!proto_address_match(conn, res->hr_remoteaddr)) {
pjdlog_error("Client %s has no access to the resource.", raddr);
nv_add_stringf(nverr, "errmsg", "No access to the resource.");
goto fail;
}
/* Is the resource marked as secondary? */
if (res->hr_role != HAST_ROLE_SECONDARY) {
pjdlog_warning("We act as %s for the resource and not as %s as requested by %s.",
role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY),
raddr);
nv_add_stringf(nverr, "errmsg",
"Remote node acts as %s for the resource and not as %s.",
role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY));
if (res->hr_role == HAST_ROLE_PRIMARY) {
/*
* If we act as primary request the other side to wait
* for us a bit, as we might be finishing cleanups.
*/
nv_add_uint8(nverr, 1, "wait");
}
goto fail;
}
/* Does token (if exists) match? */
if (token != NULL && memcmp(token, res->hr_token,
sizeof(res->hr_token)) != 0) {
pjdlog_error("Token received from %s doesn't match.", raddr);
nv_add_stringf(nverr, "errmsg", "Token doesn't match.");
goto fail;
}
/*
* If there is no token, but we have half-open connection
* (only remotein) or full connection (worker process is running)
* we have to cancel those and accept the new connection.
*/
if (token == NULL) {
PJDLOG_ASSERT(res->hr_remoteout == NULL);
pjdlog_debug(1, "Initial connection from %s.", raddr);
if (res->hr_workerpid != 0) {
PJDLOG_ASSERT(res->hr_remotein == NULL);
pjdlog_debug(1,
"Worker process exists (pid=%u), stopping it.",
(unsigned int)res->hr_workerpid);
/* Stop child process. */
if (kill(res->hr_workerpid, SIGINT) < 0) {
pjdlog_errno(LOG_ERR,
"Unable to stop worker process (pid=%u)",
(unsigned int)res->hr_workerpid);
/*
* Other than logging the problem we
* ignore it - nothing smart to do.
*/
}
/* Wait for it to exit. */
else if ((pid = waitpid(res->hr_workerpid,
&status, 0)) != res->hr_workerpid) {
/* We can only log the problem. */
pjdlog_errno(LOG_ERR,
"Waiting for worker process (pid=%u) failed",
(unsigned int)res->hr_workerpid);
} else {
child_exit_log(res->hr_workerpid, status);
}
child_cleanup(res);
} else if (res->hr_remotein != NULL) {
char oaddr[256];
proto_remote_address(res->hr_remotein, oaddr,
sizeof(oaddr));
pjdlog_debug(1,
"Canceling half-open connection from %s on connection from %s.",
oaddr, raddr);
proto_close(res->hr_remotein);
res->hr_remotein = NULL;
}
}
/*
* Checks and cleanups are done.
*/
if (token == NULL) {
arc4random_buf(res->hr_token, sizeof(res->hr_token));
nvout = nv_alloc();
nv_add_uint8_array(nvout, res->hr_token,
sizeof(res->hr_token), "token");
if (nv_error(nvout) != 0) {
pjdlog_common(LOG_ERR, 0, nv_error(nvout),
"Unable to prepare return header for %s", raddr);
nv_add_stringf(nverr, "errmsg",
"Remote node was unable to prepare return header: %s.",
strerror(nv_error(nvout)));
goto fail;
}
if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) {
int error = errno;
pjdlog_errno(LOG_ERR, "Unable to send response to %s",
raddr);
nv_add_stringf(nverr, "errmsg",
"Remote node was unable to send response: %s.",
strerror(error));
goto fail;
}
res->hr_remotein = conn;
pjdlog_debug(1, "Incoming connection from %s configured.",
raddr);
} else {
res->hr_remoteout = conn;
pjdlog_debug(1, "Outgoing connection to %s configured.", raddr);
hastd_secondary(res, nvin);
}
nv_free(nvin);
nv_free(nvout);
nv_free(nverr);
pjdlog_prefix_set("%s", "");
return;
fail:
if (nv_error(nverr) != 0) {
pjdlog_common(LOG_ERR, 0, nv_error(nverr),
"Unable to prepare error header for %s", raddr);
goto close;
}
if (hast_proto_send(NULL, conn, nverr, NULL, 0) < 0) {
pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr);
goto close;
}
close:
if (nvin != NULL)
nv_free(nvin);
if (nvout != NULL)
nv_free(nvout);
if (nverr != NULL)
nv_free(nverr);
proto_close(conn);
pjdlog_prefix_set("%s", "");
}
static void
connection_migrate(struct hast_resource *res)
{
struct proto_conn *conn;
int16_t val = 0;
pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
if (proto_recv(res->hr_conn, &val, sizeof(val)) < 0) {
pjdlog_errno(LOG_WARNING,
"Unable to receive connection command");
return;
}
if (proto_client(res->hr_sourceaddr[0] != '\0' ? res->hr_sourceaddr : NULL,
res->hr_remoteaddr, &conn) < 0) {
val = errno;
pjdlog_errno(LOG_WARNING,
"Unable to create outgoing connection to %s",
res->hr_remoteaddr);
goto out;
}
if (proto_connect(conn, -1) < 0) {
val = errno;
pjdlog_errno(LOG_WARNING, "Unable to connect to %s",
res->hr_remoteaddr);
proto_close(conn);
goto out;
}
val = 0;
out:
if (proto_send(res->hr_conn, &val, sizeof(val)) < 0) {
pjdlog_errno(LOG_WARNING,
"Unable to send reply to connection request");
}
if (val == 0 && proto_connection_send(res->hr_conn, conn) < 0)
pjdlog_errno(LOG_WARNING, "Unable to send connection");
pjdlog_prefix_set("%s", "");
}
static void
check_signals(void)
{
struct timespec sigtimeout;
sigset_t mask;
int signo;
sigtimeout.tv_sec = 0;
sigtimeout.tv_nsec = 0;
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
while ((signo = sigtimedwait(&mask, NULL, &sigtimeout)) != -1) {
switch (signo) {
case SIGINT:
case SIGTERM:
sigexit_received = true;
terminate_workers();
proto_close(cfg->hc_controlconn);
exit(EX_OK);
break;
case SIGCHLD:
child_exit();
break;
case SIGHUP:
hastd_reload();
break;
default:
PJDLOG_ABORT("Unexpected signal (%d).", signo);
}
}
}
static void
main_loop(void)
{
struct hast_resource *res;
struct hastd_listen *lst;
struct timeval seltimeout;
int fd, maxfd, ret;
time_t lastcheck, now;
fd_set rfds;
lastcheck = time(NULL);
seltimeout.tv_sec = REPORT_INTERVAL;
seltimeout.tv_usec = 0;
for (;;) {
check_signals();
/* Setup descriptors for select(2). */
FD_ZERO(&rfds);
maxfd = fd = proto_descriptor(cfg->hc_controlconn);
PJDLOG_ASSERT(fd >= 0);
FD_SET(fd, &rfds);
TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
if (lst->hl_conn == NULL)
continue;
fd = proto_descriptor(lst->hl_conn);
PJDLOG_ASSERT(fd >= 0);
FD_SET(fd, &rfds);
maxfd = fd > maxfd ? fd : maxfd;
}
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (res->hr_event == NULL)
continue;
fd = proto_descriptor(res->hr_event);
PJDLOG_ASSERT(fd >= 0);
FD_SET(fd, &rfds);
maxfd = fd > maxfd ? fd : maxfd;
if (res->hr_role == HAST_ROLE_PRIMARY) {
/* Only primary workers asks for connections. */
PJDLOG_ASSERT(res->hr_conn != NULL);
fd = proto_descriptor(res->hr_conn);
PJDLOG_ASSERT(fd >= 0);
FD_SET(fd, &rfds);
maxfd = fd > maxfd ? fd : maxfd;
} else {
PJDLOG_ASSERT(res->hr_conn == NULL);
}
}
PJDLOG_ASSERT(maxfd + 1 <= (int)FD_SETSIZE);
ret = select(maxfd + 1, &rfds, NULL, NULL, &seltimeout);
now = time(NULL);
if (lastcheck + REPORT_INTERVAL <= now) {
hook_check();
lastcheck = now;
}
if (ret == 0) {
/*
* select(2) timed out, so there should be no
* descriptors to check.
*/
continue;
} else if (ret == -1) {
if (errno == EINTR)
continue;
KEEP_ERRNO((void)pidfile_remove(pfh));
pjdlog_exit(EX_OSERR, "select() failed");
}
/*
* Check for signals before we do anything to update our
* info about terminated workers in the meantime.
*/
check_signals();
if (FD_ISSET(proto_descriptor(cfg->hc_controlconn), &rfds))
control_handle(cfg);
TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
if (lst->hl_conn == NULL)
continue;
if (FD_ISSET(proto_descriptor(lst->hl_conn), &rfds))
listen_accept(lst);
}
TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
if (res->hr_event == NULL)
continue;
if (FD_ISSET(proto_descriptor(res->hr_event), &rfds)) {
if (event_recv(res) == 0)
continue;
/* The worker process exited? */
proto_close(res->hr_event);
res->hr_event = NULL;
if (res->hr_conn != NULL) {
proto_close(res->hr_conn);
res->hr_conn = NULL;
}
continue;
}
if (res->hr_role == HAST_ROLE_PRIMARY) {
PJDLOG_ASSERT(res->hr_conn != NULL);
if (FD_ISSET(proto_descriptor(res->hr_conn),
&rfds)) {
connection_migrate(res);
}
} else {
PJDLOG_ASSERT(res->hr_conn == NULL);
}
}
}
}
static void
dummy_sighandler(int sig __unused)
{
/* Nothing to do. */
}
int
main(int argc, char *argv[])
{
struct hastd_listen *lst;
const char *pidfile;
pid_t otherpid;
bool foreground;
int debuglevel;
sigset_t mask;
foreground = false;
debuglevel = 0;
pidfile = NULL;
for (;;) {
int ch;
ch = getopt(argc, argv, "c:dFhP:");
if (ch == -1)
break;
switch (ch) {
case 'c':
cfgpath = optarg;
break;
case 'd':
debuglevel++;
break;
case 'F':
foreground = true;
break;
case 'P':
pidfile = optarg;
break;
case 'h':
default:
usage();
}
}
argc -= optind;
argv += optind;
pjdlog_init(PJDLOG_MODE_STD);
pjdlog_debug_set(debuglevel);
g_gate_load();
/*
* When path to the configuration file is relative, obtain full path,
* so we can always find the file, even after daemonizing and changing
* working directory to /.
*/
if (cfgpath[0] != '/') {
const char *newcfgpath;
newcfgpath = realpath(cfgpath, NULL);
if (newcfgpath == NULL) {
pjdlog_exit(EX_CONFIG,
"Unable to obtain full path of %s", cfgpath);
}
cfgpath = newcfgpath;
}
cfg = yy_config_parse(cfgpath, true);
PJDLOG_ASSERT(cfg != NULL);
if (pidfile != NULL) {
if (strlcpy(cfg->hc_pidfile, pidfile,
sizeof(cfg->hc_pidfile)) >= sizeof(cfg->hc_pidfile)) {
pjdlog_exitx(EX_CONFIG, "Pidfile path is too long.");
}
}
pfh = pidfile_open(cfg->hc_pidfile, 0600, &otherpid);
if (pfh == NULL) {
if (errno == EEXIST) {
pjdlog_exitx(EX_TEMPFAIL,
"Another hastd is already running, pidfile: %s, pid: %jd.",
cfg->hc_pidfile, (intmax_t)otherpid);
}
/* If we cannot create pidfile for other reasons, only warn. */
pjdlog_errno(LOG_WARNING, "Unable to open or create pidfile %s",
cfg->hc_pidfile);
}
/*
* Restore default actions for interesting signals in case parent
* process (like init(8)) decided to ignore some of them (like SIGHUP).
*/
PJDLOG_VERIFY(signal(SIGHUP, SIG_DFL) != SIG_ERR);
PJDLOG_VERIFY(signal(SIGINT, SIG_DFL) != SIG_ERR);
PJDLOG_VERIFY(signal(SIGTERM, SIG_DFL) != SIG_ERR);
/*
* Because SIGCHLD is ignored by default, setup dummy handler for it,
* so we can mask it.
*/
PJDLOG_VERIFY(signal(SIGCHLD, dummy_sighandler) != SIG_ERR);
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
/* Listen on control address. */
if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) < 0) {
KEEP_ERRNO((void)pidfile_remove(pfh));
pjdlog_exit(EX_OSERR, "Unable to listen on control address %s",
cfg->hc_controladdr);
}
/* Listen for remote connections. */
TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
if (proto_server(lst->hl_addr, &lst->hl_conn) < 0) {
KEEP_ERRNO((void)pidfile_remove(pfh));
pjdlog_exit(EX_OSERR, "Unable to listen on address %s",
lst->hl_addr);
}
}
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 %s",
cfg->hc_pidfile);
} else {
pjdlog_debug(1, "PID stored in %s.", cfg->hc_pidfile);
}
}
pjdlog_info("Started successfully, running protocol version %d.",
HAST_PROTO_VERSION);
pjdlog_debug(1, "Listening on control address %s.",
cfg->hc_controladdr);
TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next)
pjdlog_info("Listening on address %s.", lst->hl_addr);
hook_init();
main_loop();
exit(0);
}
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