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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZSubscribeTo, ZUnsubscribeTo, and
* ZCancelSubscriptions functions.
*
* Created by: Robert French
*
* Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include "internal.h"
static Code_t Z_Subscriptions __P((register ZSubscription_t *sublist,
int nitems, unsigned int port,
char *opcode, int authit));
static Code_t subscr_sendoff __P((ZNotice_t *notice, char **lyst, int num,
int authit));
Code_t ZSubscribeTo(sublist, nitems, port)
ZSubscription_t *sublist;
int nitems;
unsigned int port;
{
return (Z_Subscriptions(sublist, nitems, port, CLIENT_SUBSCRIBE, 1));
}
Code_t ZSubscribeToSansDefaults(sublist, nitems, port)
ZSubscription_t *sublist;
int nitems;
unsigned int port;
{
return (Z_Subscriptions(sublist, nitems, port, CLIENT_SUBSCRIBE_NODEFS,
1));
}
Code_t ZUnsubscribeTo(sublist, nitems, port)
ZSubscription_t *sublist;
int nitems;
unsigned int port;
{
return (Z_Subscriptions(sublist, nitems, port, CLIENT_UNSUBSCRIBE, 1));
}
Code_t ZCancelSubscriptions(port)
unsigned int port;
{
return (Z_Subscriptions((ZSubscription_t *)0, 0, port,
CLIENT_CANCELSUB, 0));
}
/*
* This routine must do its own fragmentation. Subscriptions must
* not be broken across packet boundaries, or else the server will
* mis-interpret them.
*/
static Code_t
Z_Subscriptions(sublist, nitems, port, opcode, authit)
register ZSubscription_t *sublist;
int nitems;
unsigned int port;
char *opcode;
int authit;
{
register int i, j;
int retval;
ZNotice_t notice;
char header[Z_MAXHEADERLEN];
char **list;
char *recip;
int hdrlen;
int size_avail = Z_MAXPKTLEN-Z_FRAGFUDGE; /* space avail for data,
adjusted below */
int size, start, numok;
/* nitems = 0 means cancel all subscriptions; still need to allocate a */
/* array for one item so we can cancel, however. */
list = (char **)malloc((unsigned)((nitems==0)?1:nitems)*3*sizeof(char *));
if (!list)
return (ENOMEM);
(void) memset((char *)¬ice, 0, sizeof(notice));
notice.z_kind = ACKED;
notice.z_port = port;
notice.z_class = ZEPHYR_CTL_CLASS;
notice.z_class_inst = ZEPHYR_CTL_CLIENT;
notice.z_opcode = opcode;
notice.z_sender = 0;
notice.z_recipient = "";
notice.z_default_format = "";
notice.z_message_len = 0;
/* format the header to figure out how long it is */
retval = Z_FormatHeader(¬ice, header, sizeof(header), &hdrlen, ZAUTH);
if (retval != ZERR_NONE && !authit)
retval = Z_FormatHeader(¬ice, header, sizeof(header),
&hdrlen, ZNOAUTH);
if (retval != ZERR_NONE) {
free((char *)list);
return(retval);
}
/* compute amount of room left */
size_avail -= hdrlen;
size = size_avail;
/* assemble subs into an array of pointers */
for (i=0;i<nitems;i++) {
list[i*3] = sublist[i].zsub_class;
list[i*3+1] = sublist[i].zsub_classinst;
recip = sublist[i].zsub_recipient;
if (recip && *recip == '*')
recip++;
if (!recip || (*recip != 0 && *recip != '@'))
recip = ZGetSender();
list[i*3+2] = recip;
}
start = -1;
i = 0;
numok = 0;
if (!nitems) {
/* there aren't really any, but we need to xmit anyway */
retval = subscr_sendoff(¬ice, list, 0, authit);
free((char *)list);
return(retval);
}
while(i < nitems) {
if (start == -1) {
size = size_avail;
start = i;
numok = 0;
}
if ((j = strlen(list[i*3])
+ strlen(list[i*3+1])
+ strlen(list[i*3+2]) + 3) <= size) {
/* it will fit in this packet */
size -= j;
numok++;
i++;
continue;
}
if (!numok) { /* a single subscription won't
fit into one packet */
free((char *)list);
return(ZERR_FIELDLEN);
}
retval = subscr_sendoff(¬ice, &list[start*3], numok, authit);
if (retval) {
free((char *)list);
return(retval);
}
start = -1;
}
if (numok)
retval = subscr_sendoff(¬ice, &list[start*3], numok, authit);
free((char *)list);
return(retval);
}
static Code_t
subscr_sendoff(notice, lyst, num, authit)
ZNotice_t *notice;
char **lyst;
int num;
int authit;
{
register Code_t retval;
ZNotice_t retnotice;
retval = ZSendList(notice, lyst, num*3, ZAUTH);
if (retval != ZERR_NONE && !authit)
retval = ZSendList(notice, lyst, num*3, ZNOAUTH);
if (retval != ZERR_NONE)
return (retval);
if ((retval = ZIfNotice(&retnotice, (struct sockaddr_in *)0,
ZCompareUIDPred, (char *)¬ice->z_uid)) !=
ZERR_NONE)
return (retval);
if (retnotice.z_kind == SERVNAK) {
ZFreeNotice(&retnotice);
return (ZERR_SERVNAK);
}
if (retnotice.z_kind != SERVACK) {
ZFreeNotice(&retnotice);
return (ZERR_INTERNAL);
}
ZFreeNotice(&retnotice);
return (ZERR_NONE);
}
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