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/* This file is part of the Project Athena Zephyr Notification System.
* It contains the hostmanager <--> server interaction routines.
*
* Created by: David C. Jedlinsky
*
* $Source$
* $Author$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include "hm.h"
#ifndef lint
#ifndef SABER
static char rcsid_hm_server_c[] = "$Header$";
#endif SABER
#endif lint
int serv_loop = 0;
extern u_short cli_port;
extern struct sockaddr_in serv_sin, from;
extern int timeout_type, hmdebug, nservchang, booting, nserv, no_server;
extern int deactivated;
extern char **serv_list, **cur_serv_list;
extern char cur_serv[], prim_serv[];
/* Argument is whether we are actually booting, or just attaching
after a server switch */
send_boot_notice(op)
char *op;
{
ZNotice_t notice;
Code_t ret;
/* Set up server notice */
notice.z_kind = HMCTL;
notice.z_port = cli_port;
notice.z_class = ZEPHYR_CTL_CLASS;
notice.z_class_inst = ZEPHYR_CTL_HM;
notice.z_opcode = op;
notice.z_sender = "HM";
notice.z_recipient = "";
notice.z_default_format = 0;
notice.z_message_len = 0;
/* Notify server that this host is here */
if ((ret = ZSetDestAddr(&serv_sin)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "setting destination");
}
if ((ret = ZSendNotice(¬ice, ZNOAUTH)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "sending startup notice");
}
timeout_type = BOOTING;
(void)alarm(SERV_TIMEOUT);
}
/* Argument is whether we are detaching or really going down */
send_flush_notice(op)
char *op;
{
ZNotice_t notice;
Code_t ret;
/* Set up server notice */
notice.z_kind = HMCTL;
notice.z_port = cli_port;
notice.z_class = ZEPHYR_CTL_CLASS;
notice.z_class_inst = ZEPHYR_CTL_HM;
notice.z_opcode = op;
notice.z_sender = "HM";
notice.z_recipient = "";
notice.z_default_format = 0;
notice.z_message_len = 0;
/* Tell server to lose us */
if ((ret = ZSetDestAddr(&serv_sin)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "setting destination");
}
if ((ret = ZSendNotice(¬ice, ZNOAUTH)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "sending flush notice");
}
}
find_next_server(sugg_serv)
char *sugg_serv;
{
struct hostent *hp;
int done = 0;
char **parse = serv_list;
if (sugg_serv) {
do {
if (!strcmp(*parse, sugg_serv))
done = 1;
} while ((done == 0) && (*++parse != NULL));
}
if (done) {
if (hmdebug)
syslog(LOG_DEBUG, "Suggested server: %s\n", sugg_serv);
hp = gethostbyname(sugg_serv);
DPR2 ("Server = %s\n", sugg_serv);
(void)strcpy(cur_serv, sugg_serv);
} else {
if ((++serv_loop > 3) && (strcmp(cur_serv, prim_serv))) {
serv_loop = 0;
hp = gethostbyname(prim_serv);
DPR2 ("Server = %s\n", prim_serv);
(void)strcpy(cur_serv, prim_serv);
} else
do {
if (*++cur_serv_list == NULL)
cur_serv_list = serv_list;
if (strcmp(*cur_serv_list, cur_serv)) {
hp = gethostbyname(*cur_serv_list);
DPR2 ("Server = %s\n", *cur_serv_list);
(void)strcpy(cur_serv, *cur_serv_list);
done = 1;
}
} while (done == 0);
}
bcopy(hp->h_addr, &serv_sin.sin_addr, hp->h_length);
nservchang++;
}
server_manager(notice)
ZNotice_t *notice;
{
if ((bcmp(&serv_sin.sin_addr, &from.sin_addr, 4) != 0) ||
(serv_sin.sin_port != from.sin_port)) {
syslog (LOG_INFO, "Bad notice from port %u.", notice->z_port);
} else {
/* This is our server, handle the notice */
booting = 0;
DPR ("A notice came in from the server.\n");
nserv++;
switch(notice->z_kind) {
case HMCTL:
hm_control(notice);
break;
case SERVNAK:
case SERVACK:
send_back(notice);
break;
default:
syslog (LOG_INFO, "Bad notice kind!?");
break;
}
}
}
hm_control(notice)
ZNotice_t *notice;
{
Code_t ret;
struct hostent *hp;
char suggested_server[64];
long addr;
DPR("Control message!\n");
if (!strcmp(notice->z_opcode, SERVER_SHUTDOWN)) {
if (notice->z_message_len) {
addr = inet_addr(notice->z_message);
if ((hp = gethostbyaddr(&addr,
4,
AF_INET)) != NULL) {
(void)strcpy(suggested_server, hp->h_name);
new_server(suggested_server);
} else
new_server(NULL);
}
else
new_server(NULL);
} else if (!strcmp(notice->z_opcode, SERVER_PING)) {
if (no_server)
(void)alarm(0);
notice->z_kind = HMACK;
if ((ret = ZSetDestAddr(&serv_sin)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "setting destination");
}
if ((ret = ZSendRawNotice(notice)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "sending ACK");
}
if (no_server) {
no_server = 0;
retransmit_queue(&serv_sin);
}
} else
syslog (LOG_INFO, "Bad control message.");
}
send_back(notice)
ZNotice_t *notice;
{
ZNotice_Kind_t kind;
struct sockaddr_in repl;
Code_t ret;
if (no_server)
(void)alarm(0);
if (!strcmp(notice->z_opcode, HM_BOOT) ||
!strcmp(notice->z_opcode, HM_ATTACH)) {
/* ignore message, just an ack from boot */
} else {
if (remove_notice_from_queue(notice, &kind,
&repl) != ZERR_NONE) {
syslog (LOG_INFO, "Hey! This packet isn't in my queue!");
} else {
/* check if client wants an ACK, and send it */
if (kind == ACKED) {
DPR2 ("Client ACK port: %u\n", ntohs(repl.sin_port));
if ((ret = ZSetDestAddr(&repl)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "setting destination");
}
if ((ret = ZSendRawNotice(notice)) != ZERR_NONE) {
Zperr(ret);
com_err("hm", ret, "sending ACK");
}
}
}
}
if (no_server) {
no_server = 0;
retransmit_queue(&serv_sin);
}
}
new_server(sugg_serv)
char *sugg_serv;
{
no_server = 1;
syslog (LOG_INFO, "Server went down, finding new server.");
send_flush_notice(HM_DETACH);
find_next_server(sugg_serv);
if (booting) {
send_boot_notice(HM_BOOT);
deactivated = 0;
} else
send_boot_notice(HM_ATTACH);
}
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