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- /*
- * Program: Subscription Manager (Unix based)
- *
- * Author: Mark Crispin
- * Networks and Distributed Computing
- * Computing & Communications
- * University of Washington
- * Administration Building, AG-44
- * Seattle, WA 98195
- * Internet: MRC@CAC.Washington.EDU
- *
- * Date: 19 November 1992
- * Last Edited: 11 May 1993
- *
- * Copyright 1993 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appears in all copies and that both the
- * above copyright notice and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made
- * available "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
-
- #include "mail.h"
- #include "osdep.h"
- #include <sys/file.h>
- #include <sys/stat.h>
- #include "misc.h"
-
- #define SUBSCRIPTIONFILE(t) sprintf (t,"%s/.mailboxlist",myhomedir ())
-
- /* Subscribe to mailbox
- * Accepts: mailbox name
- * Returns: T on success, NIL on failure
- */
-
- long sm_subscribe (char *mailbox)
- {
- int fd;
- char *s,*t,*txt,tmp[MAILTMPLEN],tmpx[MAILTMPLEN];
- struct stat sbuf;
- long ret = T;
- if (*mailbox == '/') { /* coerce absolute file paths */
- int i = strlen (s = myhomedir ());
- if (!strncmp (mailbox,s,i) && mailbox[i] == '/') {
- sprintf (tmpx,"~%s",mailbox + i);
- mailbox = tmpx; /* set as name to subscribe */
- }
- }
- SUBSCRIPTIONFILE (tmp); /* open subscription database */
- if ((fd = open (tmp,O_RDWR|O_CREAT,0600)) >= 0) {
- flock (fd,LOCK_EX); /* wait for exclusive access */
- fstat (fd,&sbuf); /* get file size and read data */
- read (fd,s = txt = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
- s[sbuf.st_size] = '\0'; /* tie off string */
- while (t = strchr (s,'\n')){/* for each line in database */
- *t++ = '\0'; /* tie off string */
- if (strcmp (s,mailbox)) s = t;
- else { /* oops, it's subscribed */
- sprintf (tmp,"Already subscribed to mailbox %s",mailbox);
- mm_log (tmp,ERROR);
- ret = NIL;
- break;
- }
- }
- if (ret) { /* append to end of file if OK */
- lseek (fd,sbuf.st_size,L_SET);
- sprintf (tmp,"%s\n",mailbox);
- write (fd,tmp,strlen (tmp));
- fsync (fd); /* drop changes */
- }
- flock (fd,LOCK_UN); /* release lock */
- close (fd); /* close off file */
- fs_give ((void **) &txt); /* free database */
- }
- else {
- mm_log ("Can't create subscription database",ERROR);
- ret = NIL;
- }
- return ret; /* all done */
- }
-
- /* Unsubscribe from mailbox
- * Accepts: mailbox name
- * Returns: T on success, NIL on failure
- */
-
- long sm_unsubscribe (char *mailbox)
- {
- int fd;
- char *s,*t,*txt,*end,tmp[MAILTMPLEN],tmpx[MAILTMPLEN];
- struct stat sbuf;
- long ret = NIL;
- if (*mailbox == '/') { /* coerce absolute file paths */
- int i = strlen (s = myhomedir ());
- if (!strncmp (mailbox,s,i) && mailbox[i] == '/') {
- sprintf (tmpx,"~%s",mailbox + i);
- mailbox = tmpx; /* set as name to subscribe */
- }
- }
- SUBSCRIPTIONFILE (tmp); /* open subscription database */
- if ((fd = open (tmp,O_RDWR,NIL)) >= 0) {
- flock (fd,LOCK_EX); /* wait for exclusive access */
- fstat (fd,&sbuf); /* get file size and read data */
- read (fd,s = txt = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
- /* tie off string */
- *(end = s + sbuf.st_size) = '\0';
- while (t = strchr (s,'\n')){/* for each line in database */
- *t++ = '\0'; /* temporarily tie off string */
- if (strcmp (s,mailbox)) { /* match? */
- t[-1] = '\n'; /* no, restore newline */
- s = t; /* try next subscription */
- }
- else { /* cancel subscription */
- if (t != end) memcpy (s,t,1 + end - t);
- end -= t - s; /* calculate new end of database */
- ret = T; /* note cancelled a subscription */
- }
- }
- if (ret) { /* found any? */
- lseek (fd,0,L_SET); /* yes, seek to start of file and write new */
- if (end != txt) write (fd,txt,end - txt);
- ftruncate (fd,end - txt); /* tie off file */
- fsync (fd); /* drop changes */
- }
- else { /* subscription not found */
- sprintf (tmp,"Not subscribed to mailbox %s",mailbox);
- mm_log (tmp,ERROR); /* error if at end */
- }
- flock (fd,LOCK_UN); /* release lock */
- close (fd); /* close off file */
- fs_give ((void **) &txt); /* free database */
- }
- else {
- mm_log ("No subscriptions",ERROR);
- ret = NIL;
- }
- return ret; /* all done */
- }
-
- /* Read subscription database
- * Accepts: pointer to subscription database handle (handle NIL if first time)
- * Returns: character string for subscription database or NIL if done
- * Note - uses strtok() mechanism
- */
-
- char *sm_read (void **sdb)
- {
- int fd;
- char *s,*t,tmp[MAILTMPLEN];
- struct stat sbuf;
- if (!*sdb) { /* first time through? */
- SUBSCRIPTIONFILE (tmp); /* open subscription database */
- if ((fd = open (tmp,O_RDONLY,NIL)) >= 0) {
- flock (fd,LOCK_SH); /* let others know we're here */
- fstat (fd,&sbuf); /* get file size and read data */
- read (fd,s = (char *) (*sdb = fs_get (sbuf.st_size + 1)),sbuf.st_size);
- flock (fd,LOCK_UN); /* release lock */
- close (fd); /* close file */
- s[sbuf.st_size] = '\0'; /* tie off string */
- if (t = strtok (s,"\n")) return t;
- }
- }
- /* subsequent times through database */
- else if (t = strtok (NIL,"\n")) return t;
- fs_give (sdb); /* free database */
- return NIL; /* all done */
- }
-