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|
/* This file is part of the Project Athena Zephyr Notification System.
* It contains functions for dispatching a notice.
*
* Created by: John T. Kohl
*
* $Source$
* $Author$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#ifndef lint
#ifndef SABER
static char rcsid_dispatch_c[] = "$Header$";
#endif SABER
#endif lint
#include "zserver.h"
#include <sys/socket.h>
/*
*
* External Routines:
*
* void dispatch(notice, auth, who)
* ZNotice_t *notice;
* int auth;
* struct sockaddr_in *who;
*
* void clt_ack(notice, who, sent)
* ZNotice_t *notice;
* struct sockaddr_in *who;
* ZSentType sent;
*
* void nack_release(client)
* ZClient_t *client;
*
* void sendit(notice, auth, who)
* ZNotice_t *notice;
* int auth;
* struct sockaddr_in *who;
*
* void xmit(notice, dest, auth, client)
* ZNotice_t *notice;
* struct sockaddr_in *dest;
* int auth;
* ZClient_t *client;
*/
static void rexmit(), nack_cancel();
/* patchable magic numbers controlling the retransmission rate and count */
int num_rexmits = NUM_REXMITS;
long rexmit_secs = REXMIT_SECS;
long abs_timo = REXMIT_SECS*NUM_REXMITS + 10;
#ifdef DEBUG
char *pktypes[] = {
"UNSAFE",
"UNACKED",
"ACKED",
"HMACK",
"HMCTL",
"SERVACK",
"SERVNAK",
"CLIENTACK"
};
#endif DEBUG
/*
* Handle an input packet.
* Warning: this function may be called from within a brain dump.
*/
void
handle_packet()
{
Code_t status;
ZPacket_t input_packet; /* from the network */
ZNotice_t new_notice; /* parsed from input_packet */
int input_len; /* len of packet */
struct sockaddr_in input_sin; /* constructed for authent */
struct sockaddr_in whoisit; /* for holding peer's address */
int authentic; /* authentic flag */
ZSrvPending_t *pending; /* pending packet */
ZHostList_t *host; /* host ptr */
/* handle traffic */
if (otherservers[me_server_idx].zs_update_queue) {
/* something here for me; take care of it */
if (zdebug)
syslog(LOG_DEBUG, "internal queue process");
pending = otherservers[me_server_idx].zs_update_queue->q_forw;
host = hostm_find_host(&(pending->pend_who.sin_addr));
if (host && host->zh_locked) {
/* can't deal with it now. to preserve ordering,
we can't process other packets, esp. since we
may block since we don't really know if there
are things in the real queue. */
zdbug((LOG_DEBUG,"host %s is locked",
inet_ntoa(host->zh_addr.sin_addr)));
return;
}
pending = server_dequeue(me_server); /* we can do it, remove */
if (status = ZParseNotice(pending->pend_packet,
pending->pend_len,
&new_notice)) {
syslog(LOG_ERR,
"bad notice parse (%s): %s",
inet_ntoa(pending->pend_who.sin_addr),
error_message(status));
} else
dispatch(&new_notice, pending->pend_auth,
&pending->pend_who);
server_pending_free(pending);
return;
}
/*
* nothing in internal queue, go to the external library
* queue/socket
*/
if (status = ZReceivePacket(input_packet,
&input_len,
&whoisit)) {
syslog(LOG_ERR,
"bad packet receive: %s",
error_message(status));
return;
}
npackets++;
if (status = ZParseNotice(input_packet,
input_len,
&new_notice)) {
syslog(LOG_ERR,
"bad notice parse (%s): %s",
inet_ntoa(whoisit.sin_addr),
error_message(status));
return;
}
if (server_which_server(&whoisit)) {
/* we need to parse twice--once to get
the source addr, second to check
authentication */
bzero((caddr_t) &input_sin,
sizeof(input_sin));
input_sin.sin_addr.s_addr = new_notice.z_sender_addr.s_addr;
input_sin.sin_port = new_notice.z_port;
input_sin.sin_family = AF_INET;
authentic = ZCheckAuthentication(&new_notice,
&input_sin);
} else
authentic = ZCheckAuthentication(&new_notice,
&whoisit);
switch (authentic) {
case ZAUTH_YES:
authentic = 1;
break;
case ZAUTH_FAILED:
case ZAUTH_NO:
default:
authentic = 0;
break;
}
if (whoisit.sin_port != hm_port &&
strcmp(new_notice.z_class,ZEPHYR_ADMIN_CLASS) &&
whoisit.sin_port != sock_sin.sin_port &&
new_notice.z_kind != CLIENTACK) {
syslog(LOG_ERR,
"bad port %s/%d",
inet_ntoa(whoisit.sin_addr),
ntohs(whoisit.sin_port));
return;
}
dispatch(&new_notice, authentic, &whoisit);
return;
}
/*
* Dispatch a notice.
*/
void
dispatch(notice, auth, who)
register ZNotice_t *notice;
int auth;
struct sockaddr_in *who;
{
Code_t status;
int dispatched = 0;
/* assumes enums are allocated contiguous, increasing values */
if ((int) notice->z_kind < (int) UNSAFE ||
(int) notice->z_kind > (int) CLIENTACK) {
syslog(LOG_INFO, "bad notice kind 0x%x from %s",
(int) notice->z_kind,
inet_ntoa(who->sin_addr));
return;
}
#ifdef DEBUG
if (zdebug) {
char buf[4096];
(void) sprintf(buf, "disp:%s '%s' '%s' '%s' '%s' '%s' %s/%d/%d",
pktypes[(int) notice->z_kind],
notice->z_class,
notice->z_class_inst,
notice->z_opcode,
notice->z_sender,
notice->z_recipient,
inet_ntoa(who->sin_addr),
ntohs(who->sin_port),
ntohs(notice->z_port));
syslog(LOG_DEBUG, buf);
}
#endif DEBUG
if (notice->z_kind == CLIENTACK) {
nack_cancel(notice, who);
return;
}
if (server_which_server(who)) {
status = server_dispatch(notice, auth, who);
dispatched = 1;
} else if (class_is_hm(notice)) {
status = hostm_dispatch(notice, auth, who, me_server);
dispatched = 1;
} else if (class_is_control(notice)) {
status = control_dispatch(notice, auth, who, me_server);
dispatched = 1;
} else if (class_is_ulogin(notice)) {
status = ulogin_dispatch(notice, auth, who, me_server);
dispatched = 1;
} else if (class_is_ulocate(notice)) {
status = ulocate_dispatch(notice, auth, who, me_server);
dispatched = 1;
} else if (class_is_admin(notice)) {
status = server_adispatch(notice, auth, who, me_server);
dispatched = 1;
}
if (dispatched) {
if (status == ZSRV_REQUEUE) {
#ifdef CONCURRENT
server_self_queue(notice, auth, who);
#else
syslog(LOG_ERR, "requeue while not concurr");
abort();
#endif CONCURRENT
}
return;
}
/* oh well, do the dirty work */
sendit(notice, auth, who);
}
/*
* Send a notice off to those clients who have subscribed to it.
*/
void
sendit(notice, auth, who)
register ZNotice_t *notice;
int auth;
struct sockaddr_in *who;
{
int acked = 0;
ZAcl_t *acl;
register ZClientList_t *clientlist, *ptr;
if (acl = class_get_acl(notice->z_class)) {
/* if controlled and not auth, fail */
if (!auth) {
syslog(LOG_WARNING, "sendit unauthentic %s from %s",
notice->z_class, notice->z_sender);
clt_ack(notice, who, AUTH_FAILED);
return;
}
/* if not auth to transmit, fail */
if (!access_check(notice, acl, TRANSMIT)) {
syslog(LOG_WARNING, "sendit unauthorized %s from %s",
notice->z_class, notice->z_sender);
clt_ack(notice, who, AUTH_FAILED);
return;
}
/* sender != inst and not auth to send to others --> fail */
if (strcmp(notice->z_sender, notice->z_class_inst) &&
!access_check(notice, acl, INSTUID)) {
syslog(LOG_WARNING,
"sendit unauth uid %s %s.%s",
notice->z_sender,
notice->z_class,
notice->z_class_inst);
clt_ack(notice, who, AUTH_FAILED);
return;
}
}
if ((clientlist = subscr_match_list(notice))) {
for (ptr = clientlist->q_forw;
ptr != clientlist;
ptr = ptr->q_forw) {
/* for each client who gets this notice,
send it along */
xmit(notice, &(ptr->zclt_client->zct_sin), auth,
ptr->zclt_client);
if (!acked) {
acked = 1;
ack(notice, who);
}
}
subscr_free_list(clientlist);
}
if (!acked)
nack(notice, who);
}
/*
* Clean up the not-yet-acked queue and release anything destined
* for the client.
*/
void
nack_release(client)
ZClient_t *client;
{
register ZNotAcked_t *nacked, *nack2;
/* search the not-yet-acked list for anything destined to him, and
flush it. */
for (nacked = nacklist->q_forw;
nacked != nacklist;)
if ((nacked->na_addr.sin_addr.s_addr == client->zct_sin.sin_addr.s_addr) &&
(nacked->na_addr.sin_port == client->zct_sin.sin_port)) {
/* go back, since remque will change things */
nack2 = nacked->q_back;
timer_reset(nacked->na_timer);
xremque(nacked);
xfree(nacked->na_packet);
xfree(nacked);
/* now that the remque adjusted the linked list,
we go forward again */
nacked = nack2->q_forw;
} else
nacked = nacked->q_forw;
return;
}
/*
* Send one packet of a fragmented message to a client. After transmitting,
* put it onto the not ack'ed list.
*/
/* the arguments must be the same as the arguments to Z_XmitFragment */
/*ARGSUSED*/
Code_t
xmit_frag(notice, buf, len, waitforack)
ZNotice_t *notice;
char *buf;
int len, waitforack;
{
char *savebuf;
register ZNotAcked_t *nacked;
Code_t retval;
if ((retval = ZSendPacket(buf, len, 0)) != ZERR_NONE) {
syslog(LOG_WARNING, "xmit_frag send: %s",
error_message(retval));
return(retval);
}
/* now we've sent it, mark it as not ack'ed */
if (!(nacked = (ZNotAcked_t *)xmalloc(sizeof(ZNotAcked_t)))) {
/* no space: just punt */
syslog(LOG_WARNING, "xmit_frag nack malloc");
return(ENOMEM);
}
if (!(savebuf = (char *)xmalloc(len))) {
/* no space: just punt */
syslog(LOG_WARNING, "xmit_frag pack malloc");
return(ENOMEM);
}
(void) bcopy(buf, savebuf, len);
nacked->na_rexmits = 0;
nacked->na_packet = savebuf;
nacked->na_addr = ZGetDestAddr();
nacked->na_packsz = len;
nacked->na_uid = notice->z_uid;
nacked->q_forw = nacked->q_back = nacked;
nacked->na_abstimo = NOW + abs_timo;
/* set a timer to retransmit when done */
nacked->na_timer = timer_set_rel(rexmit_secs,
rexmit,
(caddr_t) nacked);
/* chain in */
xinsque(nacked, nacklist);
return(ZERR_NONE);
}
/*
* Send the notice to the client. After transmitting, put it onto the
* not ack'ed list.
*/
void
xmit(notice, dest, auth, client)
register ZNotice_t *notice;
struct sockaddr_in *dest;
int auth;
ZClient_t *client;
{
caddr_t noticepack;
register ZNotAcked_t *nacked;
int packlen;
Code_t retval;
zdbug((LOG_DEBUG,"xmit"));
if (!(noticepack = (caddr_t) xmalloc(sizeof(ZPacket_t)))) {
syslog(LOG_ERR, "xmit malloc");
return; /* DON'T put on nack list */
}
packlen = sizeof(ZPacket_t);
if (auth && client) { /*
we are distributing authentic and
we have a pointer to auth info
*/
#ifdef KERBEROS
if ((retval = ZFormatAuthenticNotice(notice,
noticepack,
packlen,
&packlen,
client->zct_cblock))
!= ZERR_NONE) {
syslog(LOG_ERR, "xmit auth format: %s",
error_message(retval));
xfree(noticepack);
return;
}
#else /* !KERBEROS */
notice->z_auth = 1;
if ((retval = ZFormatSmallRawNotice(notice,
noticepack,
&packlen))
!= ZERR_NONE) {
syslog(LOG_ERR, "xmit auth/raw format: %s",
error_message(retval));
xfree(noticepack);
return;
}
#endif /* KERBEROS */
} else {
notice->z_auth = 0;
notice->z_authent_len = 0;
notice->z_ascii_authent = (char *)"";
if ((retval = ZFormatSmallRawNotice(notice,
noticepack,
&packlen)) != ZERR_NONE) {
syslog(LOG_ERR, "xmit format: %s",
error_message(retval));
xfree(noticepack);
return; /* DON'T put on nack list */
}
}
zdbug((LOG_DEBUG," to %s/%d",inet_ntoa(dest->sin_addr),
ntohs(dest->sin_port)));
if ((retval = ZSetDestAddr(dest)) != ZERR_NONE) {
syslog(LOG_WARNING, "xmit set addr: %s",
error_message(retval));
xfree(noticepack);
return;
}
if ((retval = ZSendPacket(noticepack, packlen, 0)) != ZERR_NONE) {
syslog(LOG_WARNING, "xmit xmit: %s", error_message(retval));
xfree(noticepack);
return;
}
/* now we've sent it, mark it as not ack'ed */
if (!(nacked = (ZNotAcked_t *)xmalloc(sizeof(ZNotAcked_t)))) {
/* no space: just punt */
syslog(LOG_WARNING, "xmit nack malloc");
xfree(noticepack);
return;
}
nacked->na_rexmits = 0;
nacked->na_packet = noticepack;
nacked->na_addr = *dest;
nacked->na_packsz = packlen;
nacked->na_uid = notice->z_uid;
nacked->q_forw = nacked->q_back = nacked;
nacked->na_abstimo = NOW + abs_timo;
/* set a timer to retransmit when done */
nacked->na_timer = timer_set_rel(rexmit_secs,
rexmit,
(caddr_t) nacked);
/* chain in */
xinsque(nacked, nacklist);
}
/*
* Retransmit the packet specified. If we have timed out or retransmitted
* too many times, punt the packet and initiate the host recovery algorithm
* Else, increment the count and re-send the notice packet.
*/
static void
rexmit(nackpacket)
register ZNotAcked_t *nackpacket;
{
int retval;
ZNotice_t dummy_notice;
register ZClient_t *client;
zdbug((LOG_DEBUG,"rexmit"));
if (++(nackpacket->na_rexmits) > num_rexmits ||
NOW > nackpacket->na_abstimo) {
/* possibly dead client */
dummy_notice.z_port = nackpacket->na_addr.sin_port;
client = client_which_client(&nackpacket->na_addr,
&dummy_notice);
/* unlink & free packet */
xremque(nackpacket);
xfree(nackpacket->na_packet);
xfree(nackpacket);
/* initiate recovery */
if (client)
server_recover(client);
return;
}
/* retransmit the packet */
zdbug((LOG_DEBUG," to %s/%d",
inet_ntoa(nackpacket->na_addr.sin_addr),
ntohs(nackpacket->na_addr.sin_port)));
if ((retval = ZSetDestAddr(&nackpacket->na_addr))
!= ZERR_NONE) {
syslog(LOG_WARNING, "rexmit set addr: %s",
error_message(retval));
goto requeue;
}
if ((retval = ZSendPacket(nackpacket->na_packet,
nackpacket->na_packsz, 0)) != ZERR_NONE)
syslog(LOG_WARNING, "rexmit xmit: %s", error_message(retval));
requeue:
/* reset the timer */
nackpacket->na_timer = timer_set_rel(rexmit_secs,
rexmit,
(caddr_t) nackpacket);
return;
}
/*
* Send an acknowledgement to the sending client, by sending back the
* header from the original notice with the z_kind field changed to either
* SERVACK or SERVNAK, and the contents of the message either SENT or
* NOT_SENT, depending on the value of the sent argument.
*/
void
clt_ack(notice, who, sent)
ZNotice_t *notice;
struct sockaddr_in *who;
ZSentType sent;
{
ZNotice_t acknotice;
ZPacket_t ackpack;
int packlen;
int notme = 0;
Code_t retval;
if (bdumping) { /* don't ack while dumping */
zdbug((LOG_DEBUG,"bdumping, no ack"));
return;
}
zdbug((LOG_DEBUG,"clt_ack type %d for %d to %s/%d",
(int) sent,
ntohs(notice->z_port),
inet_ntoa(who->sin_addr),
ntohs(who->sin_port)));
if (!server_which_server(who) &&
(hostm_find_server(&who->sin_addr) != me_server)) {
zdbug((LOG_DEBUG,"not me"));
notme = 1;
}
acknotice = *notice;
acknotice.z_kind = SERVACK;
switch (sent) {
case SENT:
acknotice.z_message = ZSRVACK_SENT;
break;
case NOT_FOUND:
acknotice.z_message = ZSRVACK_FAIL;
acknotice.z_kind = SERVNAK;
break;
case AUTH_FAILED:
acknotice.z_kind = SERVNAK;
/* fall thru */
case NOT_SENT:
acknotice.z_message = ZSRVACK_NOTSENT;
break;
}
acknotice.z_multinotice = "";
/* leave room for the trailing null */
acknotice.z_message_len = strlen(acknotice.z_message) + 1;
packlen = sizeof(ackpack);
if ((retval = ZFormatSmallRawNotice(&acknotice,
ackpack,
&packlen)) != ZERR_NONE) {
syslog(LOG_ERR, "clt_ack format: %s",error_message(retval));
return;
}
if ((retval = ZSetDestAddr(who)) != ZERR_NONE) {
syslog(LOG_WARNING, "clt_ack set addr: %s",
error_message(retval));
return;
}
if ((retval = ZSendPacket(ackpack, packlen, 0)) != ZERR_NONE) {
syslog(LOG_WARNING, "clt_ack xmit: %s", error_message(retval));
return;
}
if (notme)
hostm_deathgram(who, me_server);
return;
}
/*
* An ack has arrived.
* remove the packet matching this notice from the not-yet-acked queue
*/
static void
nack_cancel(notice, who)
register ZNotice_t *notice;
struct sockaddr_in *who;
{
register ZNotAcked_t *nacked;
/* search the not-yet-acked list for this packet, and
flush it. */
for (nacked = nacklist->q_forw;
nacked != nacklist;
nacked = nacked->q_forw)
if ((nacked->na_addr.sin_addr.s_addr == who->sin_addr.s_addr) &&
(nacked->na_addr.sin_port == who->sin_port))
if (ZCompareUID(&nacked->na_uid, ¬ice->z_uid)) {
timer_reset(nacked->na_timer);
xfree(nacked->na_packet);
xremque(nacked);
xfree(nacked);
return;
}
zdbug((LOG_DEBUG,"nack not found"));
return;
}
/* for compatibility when sending subscription information to old clients */
#ifdef OLD_COMPAT
#define OLD_ZEPHYR_VERSION "ZEPH0.0"
#endif /* OLD_COMPAT */
/*
* Dispatch a ZEPHYR_CTL notice.
*/
Code_t
control_dispatch(notice, auth, who, server)
ZNotice_t *notice;
int auth;
struct sockaddr_in *who;
ZServerDesc_t *server;
{
register char *opcode = notice->z_opcode;
ZClient_t *client;
ZHostList_t *host;
Code_t retval;
/*
* ZEPHYR_CTL Opcodes expected are:
* BOOT (inst HM): host has booted; flush data.
* CLIENT_SUBSCRIBE: process with the subscription mananger.
* CLIENT_UNSUBSCRIBE: ""
* CLIENT_CANCELSUB: ""
*/
if (!strcmp(notice->z_class_inst, ZEPHYR_CTL_HM))
return(hostm_dispatch(notice, auth, who, server));
else if (!strcmp(opcode, CLIENT_GIMMESUBS) ||
!strcmp(opcode, CLIENT_GIMMEDEFS)) {
/* this special case is before the auth check so that
someone who has no subscriptions does NOT get a SERVNAK
but rather an empty list. Note we must therefore
check authentication inside subscr_sendlist */
#ifdef OLD_COMPAT
/* only acknowledge if *not* old version; the old version
acknowledges the packet with the reply */
if (strcmp(notice->z_version, OLD_ZEPHYR_VERSION))
ack(notice, who);
#else /* !OLD_COMPAT */
ack(notice, who);
#endif /* OLD_COMPAT */
subscr_sendlist(notice, auth, who);
return(ZERR_NONE);
} else if (!auth) {
zdbug((LOG_DEBUG,"unauth ctrl_disp"));
if (server == me_server)
clt_ack(notice, who, AUTH_FAILED);
return(ZERR_NONE);
}
/* the rest of the expected opcodes modify state; check for
unlocked host first */
host = hostm_find_host(&who->sin_addr);
if (host && host->zh_locked)
return(ZSRV_REQUEUE);
if (!strcmp(opcode, CLIENT_SUBSCRIBE)) {
/* subscription notice */
if (!(client = client_which_client(who, notice))) {
if ((retval = client_register(notice,
who,
&client,
server)) != ZERR_NONE)
{
syslog(LOG_WARNING,
"subscr. register failed: %s",
error_message(retval));
if (server == me_server)
hostm_deathgram(who, me_server);
return(ZERR_NONE);
}
if (!(client = client_which_client(who, notice))) {
syslog(LOG_CRIT, "subscr reg. failure");
abort();
}
}
if (strcmp(client->zct_principal, notice->z_sender)) {
/* you may only subscribe for your own clients */
if (server == me_server)
clt_ack(notice, who, AUTH_FAILED);
return(ZERR_NONE);
}
#ifdef KERBEROS
bcopy((caddr_t) ZGetSession(), /* in case it's changed */
(caddr_t) client->zct_cblock,
sizeof(C_Block));
#endif KERBEROS
if ((retval = subscr_subscribe(client,notice)) != ZERR_NONE) {
syslog(LOG_WARNING, "subscr failed: %s",
error_message(retval));
if (server == me_server)
nack(notice, who);
return(ZERR_NONE);
}
} else if (!strcmp(opcode, CLIENT_UNSUBSCRIBE)) {
if ((client = client_which_client(who,notice))) {
if (strcmp(client->zct_principal, notice->z_sender)) {
/* you may only cancel for your own clients */
if (server == me_server)
clt_ack(notice, who, AUTH_FAILED);
return(ZERR_NONE);
}
(void) subscr_cancel(who, notice);
} else {
nack(notice, who);
return(ZERR_NONE);
}
} else if (!strcmp(opcode, CLIENT_CANCELSUB)) {
/* canceling subscriptions implies I can punt info about
this client */
if ((client = client_which_client(who,notice))) {
if (strcmp(client->zct_principal, notice->z_sender)) {
/* you may only cancel for your own clients */
if (server == me_server)
clt_ack(notice, who, AUTH_FAILED);
return(ZERR_NONE);
}
if (host) {
/* don't flush locations here, let him
do it explicitly */
if (zdebug)
syslog(LOG_DEBUG,
"cancelsub clt_dereg");
hostm_lose_ignore(client);
(void) client_deregister(client, host, 0);
}
}
if (!client || !host) {
zdbug((LOG_DEBUG,"can_sub not found client"));
if (server == me_server)
nack(notice, who);
return(ZERR_NONE);
}
} else {
syslog(LOG_WARNING, "unknown ctl opcode %s", opcode);
if (server == me_server)
nack(notice, who);
return(ZERR_NONE);
}
if (server == me_server) {
ack(notice, who);
server_forward(notice, auth, who);
}
return(ZERR_NONE);
}
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