/* $NetBSD: ipropd_slave.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "iprop.h"
__RCSID("$NetBSD: ipropd_slave.c,v 1.2 2017/01/28 21:31:49 christos Exp $");
static const char *config_name = "ipropd-slave";
static int verbose;
static krb5_log_facility *log_facility;
static char five_min[] = "5 min";
static char *server_time_lost = five_min;
static int time_before_lost;
const char *slave_str = NULL;
static int
connect_to_master (krb5_context context, const char *master,
const char *port_str)
{
char port[NI_MAXSERV];
struct addrinfo *ai, *a;
struct addrinfo hints;
int error;
int one = 1;
int s = -1;
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
if (port_str == NULL) {
snprintf(port, sizeof(port), "%u", IPROP_PORT);
port_str = port;
}
error = getaddrinfo(master, port_str, &hints, &ai);
if (error) {
krb5_warnx(context, "Failed to get address of to %s: %s",
master, gai_strerror(error));
return -1;
}
for (a = ai; a != NULL; a = a->ai_next) {
char node[NI_MAXHOST];
error = getnameinfo(a->ai_addr, a->ai_addrlen,
node, sizeof(node), NULL, 0, NI_NUMERICHOST);
if (error)
strlcpy(node, "[unknown-addr]", sizeof(node));
s = socket(a->ai_family, a->ai_socktype, a->ai_protocol);
if (s < 0)
continue;
if (connect(s, a->ai_addr, a->ai_addrlen) < 0) {
krb5_warn(context, errno, "connection failed to %s[%s]",
master, node);
close(s);
continue;
}
krb5_warnx(context, "connection successful "
"to master: %s[%s]", master, node);
break;
}
freeaddrinfo(ai);
if (a == NULL)
return -1;
if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)) < 0)
krb5_warn(context, errno, "setsockopt(SO_KEEPALIVE) failed");
return s;
}
static void
get_creds(krb5_context context, const char *keytab_str,
krb5_ccache *cache, const char *serverhost)
{
krb5_keytab keytab;
krb5_principal client;
krb5_error_code ret;
krb5_get_init_creds_opt *init_opts;
krb5_creds creds;
char *server;
char keytab_buf[256];
int aret;
if (keytab_str == NULL) {
ret = krb5_kt_default_name (context, keytab_buf, sizeof(keytab_buf));
if (ret)
krb5_err (context, 1, ret, "krb5_kt_default_name");
keytab_str = keytab_buf;
}
ret = krb5_kt_resolve(context, keytab_str, &keytab);
if(ret)
krb5_err(context, 1, ret, "%s", keytab_str);
ret = krb5_sname_to_principal (context, slave_str, IPROP_NAME,
KRB5_NT_SRV_HST, &client);
if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal");
ret = krb5_get_init_creds_opt_alloc(context, &init_opts);
if (ret) krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
aret = asprintf (&server, "%s/%s", IPROP_NAME, serverhost);
if (aret == -1 || server == NULL)
krb5_errx (context, 1, "malloc: no memory");
ret = krb5_get_init_creds_keytab(context, &creds, client, keytab,
0, server, init_opts);
free (server);
krb5_get_init_creds_opt_free(context, init_opts);
if(ret) krb5_err(context, 1, ret, "krb5_get_init_creds");
ret = krb5_kt_close(context, keytab);
if(ret) krb5_err(context, 1, ret, "krb5_kt_close");
ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, cache);
if(ret) krb5_err(context, 1, ret, "krb5_cc_new_unique");
ret = krb5_cc_initialize(context, *cache, creds.client);
if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize");
ret = krb5_cc_store_cred(context, *cache, &creds);
if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred");
krb5_free_cred_contents(context, &creds);
krb5_free_principal(context, client);
}
static krb5_error_code
ihave(krb5_context context, krb5_auth_context auth_context,
int fd, uint32_t version)
{
int ret;
u_char buf[8];
krb5_storage *sp;
krb5_data data;
sp = krb5_storage_from_mem(buf, 8);
ret = krb5_store_uint32(sp, I_HAVE);
if (ret == 0)
ret = krb5_store_uint32(sp, version);
krb5_storage_free(sp);
data.length = 8;
data.data = buf;
if (ret == 0) {
if (verbose)
krb5_warnx(context, "telling master we are at %u", version);
ret = krb5_write_priv_message(context, auth_context, &fd, &data);
if (ret)
krb5_warn(context, ret, "krb5_write_message");
}
return ret;
}
#ifndef EDQUOT
/* There's no EDQUOT on WIN32, for example */
#define EDQUOT ENOSPC
#endif
static int
append_to_log_file(krb5_context context,
kadm5_server_context *server_context,
krb5_storage *sp, off_t start, ssize_t slen)
{
size_t len;
ssize_t sret;
off_t log_off;
int ret, ret2;
void *buf;
if (verbose)
krb5_warnx(context, "appending diffs to log");
if (slen == 0)
return 0;
if (slen < 0)
return EINVAL;
len = slen;
if (len != slen)
return EOVERFLOW;
buf = malloc(len);
if (buf == NULL && len != 0) {
krb5_warn(context, errno, "malloc: no memory");
return ENOMEM;
}
if (krb5_storage_seek(sp, start, SEEK_SET) != start) {
krb5_errx(context, IPROPD_RESTART,
"krb5_storage_seek() failed"); /* can't happen */
}
sret = krb5_storage_read(sp, buf, len);
if (sret < 0)
return errno;
if (len != (size_t)sret) {
/* Can't happen */
krb5_errx(context, IPROPD_RESTART,
"short krb5_storage_read() from memory buffer");
}
log_off = lseek(server_context->log_context.log_fd, 0, SEEK_CUR);
if (log_off == -1)
return errno;
/*
* Use net_write() so we get an errno if less that len bytes were
* written.
*/
sret = net_write(server_context->log_context.log_fd, buf, len);
free(buf);
if (sret != slen)
ret = errno;
else
ret = fsync(server_context->log_context.log_fd);
if (ret == 0)
return 0;
/*
* Attempt to recover from this. First, truncate the log file
* and reset the fd offset. Failure to do this -> unlink the
* log file and re-create it. Since we're the slave, we ought to be
* able to recover from the log being unlinked...
*/
if (ftruncate(server_context->log_context.log_fd, log_off) == -1 ||
lseek(server_context->log_context.log_fd, log_off, SEEK_SET) == -1) {
(void) kadm5_log_end(server_context);
if (unlink(server_context->log_context.log_file) == -1) {
krb5_err(context, IPROPD_FATAL, errno,
"Failed to recover from failure to write log "
"entries from master to disk");
}
ret2 = kadm5_log_init(server_context);
if (ret2) {
krb5_err(context, IPROPD_RESTART_SLOW, ret2,
"Failed to initialize log to recover from "
"failure to write log entries from master to disk");
}
}
if (ret == ENOSPC || ret == EDQUOT || ret == EFBIG) {
/* Unlink the file in these cases. */
krb5_warn(context, IPROPD_RESTART_SLOW,
"Failed to write log entries from master to disk");
(void) kadm5_log_end(server_context);
if (unlink(server_context->log_context.log_file) == -1) {
krb5_err(context, IPROPD_FATAL, errno,
"Failed to recover from failure to write log "
"entries from master to disk");
}
ret2 = kadm5_log_init(server_context);
if (ret2) {
krb5_err(context, IPROPD_RESTART_SLOW, ret2,
"Failed to initialize log to recover from "
"failure to write log entries from master to disk");
}
return ret;
}
/*
* All other errors we treat as fatal here. This includes, for
* example, EIO and EPIPE (sorry, can't log to pipes nor sockets).
*/
krb5_err(context, IPROPD_FATAL, ret,
"Failed to write log entries from master to disk");
}
static int
receive_loop (krb5_context context,
krb5_storage *sp,
kadm5_server_context *server_context)
{
int ret;
off_t left, right, off;
uint32_t len, vers;
if (verbose)
krb5_warnx(context, "receiving diffs");
/*
* Seek to the first entry in the message from the master that is
* past the current version of the local database.
*/
do {
uint32_t timestamp;
uint32_t op;
if ((ret = krb5_ret_uint32(sp, &vers)) == HEIM_ERR_EOF) {
krb5_warnx(context, "master sent no new iprop entries");
return 0;
}
/*
* TODO We could do more to validate the entries from the master
* here. And we could use/reuse more kadm5_log_*() code here.
*
* Alternatively we should trust that the master sent us exactly
* what we needed and just write this to the log file and let
* kadm5_log_recover() do the rest.
*/
if (ret || krb5_ret_uint32(sp, ×tamp) != 0 ||
krb5_ret_uint32(sp, &op) != 0 ||
krb5_ret_uint32(sp, &len) != 0) {
/*
* This shouldn't happen. Reconnecting probably won't help
* if it does happen, but by reconnecting we get a chance to
* connect to a new master if a new one is configured.
*/
krb5_warnx(context, "iprop entries from master were truncated");
return EINVAL;
}
if (vers > server_context->log_context.version) {
break;
}
off = krb5_storage_seek(sp, 0, SEEK_CUR);
if (krb5_storage_seek(sp, len + 8, SEEK_CUR) != off + len + 8) {
krb5_warnx(context, "iprop entries from master were truncated");
return EINVAL;
}
if (verbose) {
krb5_warnx(context, "diff contains old log record version "
"%u %lld %u length %u",
vers, (long long)timestamp, op, len);
}
} while(vers <= server_context->log_context.version);
/*
* Read the remaining entries into memory...
*/
/* SEEK_CUR is a header into the first entry we care about */
left = krb5_storage_seek(sp, -16, SEEK_CUR);
right = krb5_storage_seek(sp, 0, SEEK_END);
if (right - left < 24 + len) {
krb5_warnx(context, "iprop entries from master were truncated");
return EINVAL;
}
/*
* ...and then write them out to the on-disk log.
*/
ret = append_to_log_file(context, server_context, sp, left, right - left);
if (ret)
return ret;
/*
* Replay the new entries.
*/
if (verbose)
krb5_warnx(context, "replaying entries from master");
ret = kadm5_log_recover(server_context, kadm_recover_replay);
if (ret) {
krb5_warn(context, ret, "replay failed");
return ret;
}
ret = kadm5_log_get_version(server_context, &vers);
if (ret) {
krb5_warn(context, ret,
"could not get log version after applying diffs!");
return ret;
}
if (verbose)
krb5_warnx(context, "slave at version %u", vers);
if (vers != server_context->log_context.version) {
krb5_warnx(context, "slave's log_context version (%u) is "
"inconsistent with log's version (%u)",
server_context->log_context.version, vers);
}
return 0;
}
static int
receive(krb5_context context,
krb5_storage *sp,
kadm5_server_context *server_context)
{
krb5_error_code ret, ret2;
ret = server_context->db->hdb_open(context,
server_context->db,
O_RDWR | O_CREAT, 0600);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->open");
ret2 = receive_loop(context, sp, server_context);
if (ret2)
krb5_warn(context, ret2, "receive from ipropd-master had errors");
ret = server_context->db->hdb_close(context, server_context->db);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close");
return ret2;
}
static void
send_im_here(krb5_context context, int fd,
krb5_auth_context auth_context)
{
krb5_storage *sp;
krb5_data data;
krb5_error_code ret;
ret = krb5_data_alloc(&data, 4);
if (ret)
krb5_err(context, IPROPD_RESTART, ret, "send_im_here");
sp = krb5_storage_from_data (&data);
if (sp == NULL)
krb5_errx(context, IPROPD_RESTART, "krb5_storage_from_data");
ret = krb5_store_uint32(sp, I_AM_HERE);
krb5_storage_free(sp);
if (ret == 0) {
ret = krb5_write_priv_message(context, auth_context, &fd, &data);
krb5_data_free(&data);
if (ret)
krb5_err(context, IPROPD_RESTART, ret, "krb5_write_priv_message");
if (verbose)
krb5_warnx(context, "pinged master");
}
return;
}
static void
reinit_log(krb5_context context,
kadm5_server_context *server_context,
uint32_t vno)
{
krb5_error_code ret;
if (verbose)
krb5_warnx(context, "truncating log on slave");
ret = kadm5_log_reinit(server_context, vno);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "kadm5_log_reinit");
}
static krb5_error_code
receive_everything(krb5_context context, int fd,
kadm5_server_context *server_context,
krb5_auth_context auth_context)
{
int ret;
krb5_data data;
uint32_t vno = 0;
uint32_t opcode;
krb5_storage *sp;
char *dbname;
HDB *mydb;
krb5_warnx(context, "receive complete database");
ret = asprintf(&dbname, "%s-NEW", server_context->db->hdb_name);
if (ret == -1)
krb5_err(context, IPROPD_RESTART, ENOMEM, "asprintf");
ret = hdb_create(context, &mydb, dbname);
if(ret)
krb5_err(context, IPROPD_RESTART, ret, "hdb_create");
free(dbname);
ret = hdb_set_master_keyfile(context,
mydb, server_context->config.stash_file);
if(ret)
krb5_err(context, IPROPD_RESTART, ret, "hdb_set_master_keyfile");
/* I really want to use O_EXCL here, but given that I can't easily clean
up on error, I won't */
ret = mydb->hdb_open(context, mydb, O_RDWR | O_CREAT | O_TRUNC, 0600);
if (ret)
krb5_err(context, IPROPD_RESTART, ret, "db->open");
sp = NULL;
krb5_data_zero(&data);
do {
ret = krb5_read_priv_message(context, auth_context, &fd, &data);
if (ret) {
krb5_warn(context, ret, "krb5_read_priv_message");
goto cleanup;
}
sp = krb5_storage_from_data(&data);
if (sp == NULL)
krb5_errx(context, IPROPD_RESTART, "krb5_storage_from_data");
krb5_ret_uint32(sp, &opcode);
if (opcode == ONE_PRINC) {
krb5_data fake_data;
hdb_entry_ex entry;
krb5_storage_free(sp);
fake_data.data = (char *)data.data + 4;
fake_data.length = data.length - 4;
memset(&entry, 0, sizeof(entry));
ret = hdb_value2entry(context, &fake_data, &entry.entry);
if (ret)
krb5_err(context, IPROPD_RESTART, ret, "hdb_value2entry");
ret = mydb->hdb_store(server_context->context,
mydb,
0, &entry);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "hdb_store");
hdb_free_entry(context, &entry);
krb5_data_free(&data);
} else if (opcode == NOW_YOU_HAVE)
;
else
krb5_errx(context, 1, "strange opcode %d", opcode);
} while (opcode == ONE_PRINC);
if (opcode != NOW_YOU_HAVE)
krb5_errx(context, IPROPD_RESTART_SLOW,
"receive_everything: strange %d", opcode);
krb5_ret_uint32(sp, &vno);
krb5_storage_free(sp);
reinit_log(context, server_context, vno);
ret = mydb->hdb_close(context, mydb);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close");
ret = mydb->hdb_rename(context, mydb, server_context->db->hdb_name);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->rename");
return 0;
cleanup:
krb5_data_free(&data);
if (ret)
krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close");
ret = mydb->hdb_destroy(context, mydb);
if (ret)
krb5_err(context, IPROPD_RESTART, ret, "db->destroy");
krb5_warnx(context, "receive complete database, version %ld", (long)vno);
return ret;
}
static void
slave_status(krb5_context context,
const char *file,
const char *status, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
static void
slave_status(krb5_context context,
const char *file,
const char *fmt, ...)
{
char *status;
char *fmt2;
va_list args;
int len;
if (asprintf(&fmt2, "%s\n", fmt) == -1 || fmt2 == NULL) {
(void) unlink(file);
return;
}
va_start(args, fmt);
len = vasprintf(&status, fmt2, args);
free(fmt2);
va_end(args);
if (len < 0 || status == NULL) {
(void) unlink(file);
return;
}
krb5_warnx(context, "slave status change: %s", status);
rk_dumpdata(file, status, len);
free(status);
}
static void
is_up_to_date(krb5_context context, const char *file,
kadm5_server_context *server_context)
{
krb5_error_code ret;
char buf[80];
ret = krb5_format_time(context, time(NULL), buf, sizeof(buf), 1);
if (ret) {
unlink(file);
return;
}
slave_status(context, file, "up-to-date with version: %lu at %s",
(unsigned long)server_context->log_context.version, buf);
}
static char *status_file;
static char *config_file;
static char *realm;
static int version_flag;
static int help_flag;
static char *keytab_str;
static char *port_str;
static int detach_from_console;
static int daemon_child = -1;
static struct getargs args[] = {
{ "config-file", 'c', arg_string, &config_file, NULL, NULL },
{ "realm", 'r', arg_string, &realm, NULL, NULL },
{ "keytab", 'k', arg_string, &keytab_str,
"keytab to get authentication from", "kspec" },
{ "time-lost", 0, arg_string, &server_time_lost,
"time before server is considered lost", "time" },
{ "status-file", 0, arg_string, &status_file,
"file to write out status into", "file" },
{ "port", 0, arg_string, &port_str,
"port ipropd-slave will connect to", "port"},
{ "detach", 0, arg_flag, &detach_from_console,
"detach from console", NULL },
{ "daemon-child", 0 , arg_integer, &daemon_child,
"private argument, do not use", NULL },
{ "hostname", 0, arg_string, rk_UNCONST(&slave_str),
"hostname of slave (if not same as hostname)", "hostname" },
{ "verbose", 0, arg_flag, &verbose, NULL, NULL },
{ "version", 0, arg_flag, &version_flag, NULL, NULL },
{ "help", 0, arg_flag, &help_flag, NULL, NULL }
};
static int num_args = sizeof(args) / sizeof(args[0]);
static void
usage(int status)
{
arg_printusage(args, num_args, NULL, "master");
exit(status);
}
int
main(int argc, char **argv)
{
krb5_error_code ret, ret2;
krb5_context context;
krb5_auth_context auth_context;
void *kadm_handle;
kadm5_server_context *server_context;
kadm5_config_params conf;
int master_fd;
krb5_ccache ccache;
krb5_principal server;
char **files;
int optidx = 0;
time_t reconnect_min;
time_t backoff;
time_t reconnect_max;
time_t reconnect;
time_t before = 0;
int restarter_fd = -1;
const char *master;
setprogname(argv[0]);
if (getarg(args, num_args, argc, argv, &optidx))
usage(1);
if (help_flag)
usage(0);
if (version_flag) {
print_version(NULL);
exit(0);
}
if (detach_from_console && daemon_child == -1)
roken_detach_prep(argc, argv, "--daemon-child");
rk_pidfile(NULL);
ret = krb5_init_context(&context);
if (ret)
errx (1, "krb5_init_context failed: %d", ret);
setup_signal();
if (config_file == NULL) {
if (asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context)) == -1
|| config_file == NULL)
errx(1, "out of memory");
}
ret = krb5_prepend_config_files_default(config_file, &files);
if (ret)
krb5_err(context, 1, ret, "getting configuration files");
ret = krb5_set_config_files(context, files);
krb5_free_config_files(files);
if (ret)
krb5_err(context, 1, ret, "reading configuration files");
argc -= optidx;
argv += optidx;
if (argc != 1)
usage(1);
master = argv[0];
if (status_file == NULL) {
if (asprintf(&status_file, "%s/ipropd-slave-status", hdb_db_dir(context)) < 0 || status_file == NULL)
krb5_errx(context, 1, "can't allocate status file buffer");
}
krb5_openlog(context, "ipropd-slave", &log_facility);
krb5_set_warn_dest(context, log_facility);
slave_status(context, status_file, "bootstrapping");
ret = krb5_kt_register(context, &hdb_get_kt_ops);
if(ret)
krb5_err(context, 1, ret, "krb5_kt_register");
time_before_lost = parse_time (server_time_lost, "s");
if (time_before_lost < 0)
krb5_errx (context, 1, "couldn't parse time: %s", server_time_lost);
slave_status(context, status_file, "getting credentials from keytab/database");
memset(&conf, 0, sizeof(conf));
if(realm) {
conf.mask |= KADM5_CONFIG_REALM;
conf.realm = realm;
}
ret = kadm5_init_with_password_ctx (context,
KADM5_ADMIN_SERVICE,
NULL,
KADM5_ADMIN_SERVICE,
&conf, 0, 0,
&kadm_handle);
if (ret)
krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
server_context = (kadm5_server_context *)kadm_handle;
slave_status(context, status_file, "creating log file");
ret = kadm5_log_init (server_context);
if (ret)
krb5_err (context, 1, ret, "kadm5_log_init");
get_creds(context, keytab_str, &ccache, master);
ret = krb5_sname_to_principal (context, master, IPROP_NAME,
KRB5_NT_SRV_HST, &server);
if (ret)
krb5_err (context, 1, ret, "krb5_sname_to_principal");
auth_context = NULL;
master_fd = -1;
krb5_appdefault_time(context, config_name, NULL, "reconnect-min",
10, &reconnect_min);
krb5_appdefault_time(context, config_name, NULL, "reconnect-max",
300, &reconnect_max);
krb5_appdefault_time(context, config_name, NULL, "reconnect-backoff",
10, &backoff);
reconnect = reconnect_min;
slave_status(context, status_file, "ipropd-slave started");
roken_detach_finish(NULL, daemon_child);
restarter_fd = restarter(context, NULL);
while (!exit_flag) {
struct timeval to;
time_t now, elapsed;
fd_set readset;
int connected = FALSE;
#ifndef NO_LIMIT_FD_SETSIZE
if (restarter_fd >= FD_SETSIZE)
krb5_errx(context, IPROPD_RESTART, "fd too large");
#endif
FD_ZERO(&readset);
if (restarter_fd > -1)
FD_SET(restarter_fd, &readset);
now = time(NULL);
elapsed = now - before;
if (elapsed < reconnect) {
time_t left = reconnect - elapsed;
krb5_warnx(context, "sleeping %d seconds before "
"retrying to connect", (int)left);
to.tv_sec = left;
to.tv_usec = 0;
if (select(restarter_fd + 1, &readset, NULL, NULL, &to) == 1) {
exit_flag = SIGTERM;
continue;
}
}
before = now;
slave_status(context, status_file, "connecting to master: %s\n", master);
master_fd = connect_to_master (context, master, port_str);
if (master_fd < 0)
goto retry;
reconnect = reconnect_min;
if (auth_context) {
krb5_auth_con_free(context, auth_context);
auth_context = NULL;
krb5_cc_destroy(context, ccache);
get_creds(context, keytab_str, &ccache, master);
}
if (verbose)
krb5_warnx(context, "authenticating to master");
ret = krb5_sendauth (context, &auth_context, &master_fd,
IPROP_VERSION, NULL, server,
AP_OPTS_MUTUAL_REQUIRED, NULL, NULL,
ccache, NULL, NULL, NULL);
if (ret) {
krb5_warn (context, ret, "krb5_sendauth");
goto retry;
}
krb5_warnx(context, "ipropd-slave started at version: %ld",
(long)server_context->log_context.version);
ret = ihave(context, auth_context, master_fd,
server_context->log_context.version);
if (ret)
goto retry;
connected = TRUE;
if (verbose)
krb5_warnx(context, "connected to master");
slave_status(context, status_file, "connected to master, waiting instructions");
while (connected && !exit_flag) {
krb5_data out;
krb5_storage *sp;
uint32_t tmp;
int max_fd;
#ifndef NO_LIMIT_FD_SETSIZE
if (master_fd >= FD_SETSIZE)
krb5_errx(context, IPROPD_RESTART, "fd too large");
if (restarter_fd >= FD_SETSIZE)
krb5_errx(context, IPROPD_RESTART, "fd too large");
max_fd = max(restarter_fd, master_fd);
#endif
FD_ZERO(&readset);
FD_SET(master_fd, &readset);
if (restarter_fd != -1)
FD_SET(restarter_fd, &readset);
to.tv_sec = time_before_lost;
to.tv_usec = 0;
ret = select (max_fd + 1,
&readset, NULL, NULL, &to);
if (ret < 0) {
if (errno == EINTR)
continue;
else
krb5_err (context, 1, errno, "select");
}
if (ret == 0) {
krb5_warnx(context, "server didn't send a message "
"in %d seconds", time_before_lost);
connected = FALSE;
continue;
}
if (restarter_fd > -1 && FD_ISSET(restarter_fd, &readset)) {
if (verbose)
krb5_warnx(context, "slave restarter exited");
exit_flag = SIGTERM;
}
if (!FD_ISSET(master_fd, &readset))
continue;
if (verbose)
krb5_warnx(context, "message from master");
ret = krb5_read_priv_message(context, auth_context, &master_fd, &out);
if (ret) {
krb5_warn(context, ret, "krb5_read_priv_message");
connected = FALSE;
continue;
}
sp = krb5_storage_from_mem (out.data, out.length);
if (sp == NULL)
krb5_err(context, IPROPD_RESTART, errno, "krb5_storage_from_mem");
ret = krb5_ret_uint32(sp, &tmp);
if (ret == HEIM_ERR_EOF) {
krb5_warn(context, ret, "master sent zero-length message");
connected = FALSE;
continue;
}
if (ret != 0) {
krb5_warn(context, ret, "couldn't read master's message");
connected = FALSE;
continue;
}
ret = kadm5_log_init(server_context);
if (ret) {
krb5_err(context, IPROPD_RESTART, ret, "kadm5_log_init while "
"handling a message from the master");
}
switch (tmp) {
case FOR_YOU :
if (verbose)
krb5_warnx(context, "master sent us diffs");
ret2 = receive(context, sp, server_context);
if (ret2)
krb5_warn(context, ret2,
"receive from ipropd-master had errors");
ret = ihave(context, auth_context, master_fd,
server_context->log_context.version);
if (ret || ret2)
connected = FALSE;
/*
* If it returns an error, receive() may nonetheless
* have committed some entries successfully, so we must
* update the slave_status even if there were errors.
*/
is_up_to_date(context, status_file, server_context);
break;
case TELL_YOU_EVERYTHING :
if (verbose)
krb5_warnx(context, "master sent us a full dump");
ret = receive_everything(context, master_fd, server_context,
auth_context);
if (ret == 0) {
ret = ihave(context, auth_context, master_fd,
server_context->log_context.version);
}
if (ret)
connected = FALSE;
else
is_up_to_date(context, status_file, server_context);
break;
case ARE_YOU_THERE :
if (verbose)
krb5_warnx(context, "master sent us a ping");
is_up_to_date(context, status_file, server_context);
ret = ihave(context, auth_context, master_fd,
server_context->log_context.version);
if (ret)
connected = FALSE;
send_im_here(context, master_fd, auth_context);
break;
case YOU_HAVE_LAST_VERSION:
if (verbose)
krb5_warnx(context, "master tells us we are up to date");
is_up_to_date(context, status_file, server_context);
break;
case NOW_YOU_HAVE :
case I_HAVE :
case ONE_PRINC :
case I_AM_HERE :
default :
krb5_warnx (context, "Ignoring command %d", tmp);
break;
}
krb5_storage_free (sp);
krb5_data_free (&out);
}
slave_status(context, status_file, "disconnected from master");
retry:
if (connected == FALSE)
krb5_warnx (context, "disconnected for server");
if (exit_flag)
krb5_warnx (context, "got an exit signal");
if (master_fd >= 0)
close(master_fd);
reconnect += backoff;
if (reconnect > reconnect_max) {
slave_status(context, status_file, "disconnected from master for a long time");
reconnect = reconnect_max;
}
}
if (status_file) {
/* XXX It'd be better to leave it saying we're not here */
unlink(status_file);
}
if (0);
#ifndef NO_SIGXCPU
else if(exit_flag == SIGXCPU)
krb5_warnx(context, "%s CPU time limit exceeded", getprogname());
#endif
else if(exit_flag == SIGINT || exit_flag == SIGTERM)
krb5_warnx(context, "%s terminated", getprogname());
else
krb5_warnx(context, "%s unexpected exit reason: %ld",
getprogname(), (long)exit_flag);
return 0;
}