/* $NetBSD: ipropd_slave.c,v 1.3.8.1 2023/08/11 13:40:00 martin 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 1.3.8.1 2023/08/11 13:40:00 martin 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"); /* * We write message lengths separately from the payload, avoid Nagle * delays. */ #if defined(IPPROTO_TCP) && defined(TCP_NODELAY) (void) setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *)&one, sizeof(one)); #endif 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"); (void) mydb->hdb_set_sync(context, mydb, 0); 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_set_sync(context, mydb, 1); if (ret) krb5_err(context, IPROPD_RESTART_SLOW, ret, "failed to sync the received HDB"); 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); /* * We used to send an I_HAVE here. But the master may send * ARE_YOU_THERE messages in response to local, possibly- * transient errors, and if that happens and we respond with an * I_HAVE then we'll loop hard if the error was not transient. * * So we don't ihave() here. */ 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; }