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quit.c

/*    $OpenBSD: quit.c,v 1.19 2007/09/10 14:29:53 tobias Exp $    */
/*    $NetBSD: quit.c,v 1.6 1996/12/28 07:11:07 tls Exp $   */

/*
 * Copyright (c) 1980, 1993
 *    The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)quit.c  8.2 (Berkeley) 4/28/95";
#else
static const char rcsid[] = "$OpenBSD: quit.c,v 1.19 2007/09/10 14:29:53 tobias Exp $";
#endif
#endif /* not lint */

#ifdef  __USE_SVID
#include <stdio.h>
#endif
#include "rcv.h"
#include <fcntl.h>
#include <sys/file.h>
#include "extern.h"

/*
 * Rcv -- receive mail rationally.
 *
 * Termination processing.
 */

/*
 * The "quit" command.
 */
int
quitcmd(void *v)
{
      /*
       * If we are sourcing, then return 1 so execute() can handle it.
       * Otherwise, return -1 to abort command loop.
       */
      if (sourcing)
            return(1);
      return(-1);
}

/*
 * Save all of the undetermined messages at the top of "mbox"
 * Save all untouched messages back in the system mailbox.
 * Remove the system mailbox, if none saved there.
 */
int
quit(void)
{
      int mcount, p, modify, autohold, anystat, holdbit, nohold;
      FILE *ibuf = NULL, *obuf, *fbuf, *rbuf, *readstat = NULL, *abuf;
      struct message *mp;
      int c, fd;
      struct stat minfo;
      char *mbox, tempname[PATHSIZE];

      /*
       * If we are read only, we can't do anything,
       * so just return quickly.
       */
      if (readonly)
            return(0);

      /*
       * If editing (not reading system mail box), then do the work
       * in edstop()
       */
      if (edit)
            return(edstop());

      /*
       * See if there any messages to save in mbox.  If no, we
       * can save copying mbox to /tmp and back.
       *
       * Check also to see if any files need to be preserved.
       * Delete all untouched messages to keep them out of mbox.
       * If all the messages are to be preserved, just exit with
       * a message.
       */
      fbuf = Fopen(mailname, "r+");
      if (fbuf == NULL)
            goto newmail;
      if (lockf(fileno(fbuf), F_LOCK, 0) == -1) {
            warn("Unable to lock mailbox");
            (void)Fclose(fbuf);
            return(-1);
      }
      if (!spool_lock()) {
            (void)Fclose(fbuf);
            return(-1);       /* lockspool printed the error for us */
      }
      rbuf = NULL;
      if (fstat(fileno(fbuf), &minfo) >= 0 && minfo.st_size > mailsize) {
            puts("New mail has arrived.");
            (void)snprintf(tempname, sizeof(tempname),
                "%s/mail.RqXXXXXXXXXX", tmpdir);
            if ((fd = mkstemp(tempname)) == -1 ||
                (rbuf = Fdopen(fd, "w")) == NULL)
                  goto newmail;
#ifdef APPEND
            fseek(fbuf, (long)mailsize, SEEK_SET);
            while ((c = getc(fbuf)) != EOF)
                  (void)putc(c, rbuf);
#else
            p = minfo.st_size - mailsize;
            while (p-- > 0) {
                  c = getc(fbuf);
                  if (c == EOF)
                        goto newmail;
                  (void)putc(c, rbuf);
            }
#endif
            (void)Fclose(rbuf);
            if ((rbuf = Fopen(tempname, "r")) == NULL)
                  goto newmail;
            (void)rm(tempname);
      }

      /*
       * Adjust the message flags in each message.
       */
      anystat = 0;
      autohold = value("hold") != NULL;
      holdbit = autohold ? MPRESERVE : MBOX;
      nohold = MBOX|MSAVED|MDELETED|MPRESERVE;
      if (value("keepsave") != NULL)
            nohold &= ~MSAVED;
      for (mp = &message[0]; mp < &message[msgCount]; mp++) {
            if (mp->m_flag & MNEW) {
                  mp->m_flag &= ~MNEW;
                  mp->m_flag |= MSTATUS;
            }
            if (mp->m_flag & MSTATUS)
                  anystat++;
            if ((mp->m_flag & MTOUCH) == 0)
                  mp->m_flag |= MPRESERVE;
            if ((mp->m_flag & nohold) == 0)
                  mp->m_flag |= holdbit;
      }
      modify = 0;
      if (Tflag != NULL) {
            if ((readstat = Fopen(Tflag, "w")) == NULL)
                  Tflag = NULL;
      }
      for (c = 0, p = 0, mp = &message[0]; mp < &message[msgCount]; mp++) {
            if (mp->m_flag & MBOX)
                  c++;
            if (mp->m_flag & MPRESERVE)
                  p++;
            if (mp->m_flag & MODIFY)
                  modify++;
            if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
                  char *id;

                  if ((id = hfield("article-id", mp)) != NULL)
                        fprintf(readstat, "%s\n", id);
            }
      }
      if (Tflag != NULL)
            (void)Fclose(readstat);
      if (p == msgCount && !modify && !anystat) {
            printf("Held %d message%s in %s\n",
                  p, p == 1 ? "" : "s", mailname);
            (void)Fclose(fbuf);
            spool_unlock();
            return(0);
      }
      if (c == 0) {
            if (p != 0) {
                  writeback(rbuf);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(0);
            }
            goto cream;
      }

      /*
       * Create another temporary file and copy user's mbox file
       * darin.  If there is no mbox, copy nothing.
       * If he has specified "append" don't copy his mailbox,
       * just copy saveable entries at the end.
       */
      mbox = expand("&");
      mcount = c;
      if (value("append") == NULL) {
            (void)snprintf(tempname, sizeof(tempname),
                "%s/mail.RmXXXXXXXXXX", tmpdir);
            if ((fd = mkstemp(tempname)) == -1 ||
                (obuf = Fdopen(fd, "w")) == NULL) {
                  warn("%s", tempname);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(-1);
            }
            if ((ibuf = Fopen(tempname, "r")) == NULL) {
                  warn("%s", tempname);
                  (void)rm(tempname);
                  (void)Fclose(obuf);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(-1);
            }
            (void)rm(tempname);
            if ((abuf = Fopen(mbox, "r")) != NULL) {
                  while ((c = getc(abuf)) != EOF)
                        (void)putc(c, obuf);
                  (void)Fclose(abuf);
            }
            if (ferror(obuf)) {
                  warn("%s", tempname);
                  (void)Fclose(ibuf);
                  (void)Fclose(obuf);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(-1);
            }
            (void)Fclose(obuf);
            (void)close(creat(mbox, 0600));
            if ((obuf = Fopen(mbox, "r+")) == NULL) {
                  warn("%s", mbox);
                  (void)Fclose(ibuf);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(-1);
            }
      } else {
            if ((obuf = Fopen(mbox, "a")) == NULL) {
                  warn("%s", mbox);
                  (void)Fclose(fbuf);
                  spool_unlock();
                  return(-1);
            }
            fchmod(fileno(obuf), 0600);
      }
      for (mp = &message[0]; mp < &message[msgCount]; mp++)
            if (mp->m_flag & MBOX)
                  if (sendmessage(mp, obuf, saveignore, NULL) < 0) {
                        warn("%s", mbox);
                        (void)Fclose(ibuf);
                        (void)Fclose(obuf);
                        (void)Fclose(fbuf);
                        spool_unlock();
                        return(-1);
                  }

      /*
       * Copy the user's old mbox contents back
       * to the end of the stuff we just saved.
       * If we are appending, this is unnecessary.
       */
      if (value("append") == NULL) {
            rewind(ibuf);
            c = getc(ibuf);
            while (c != EOF) {
                  (void)putc(c, obuf);
                  if (ferror(obuf))
                        break;
                  c = getc(ibuf);
            }
            (void)Fclose(ibuf);
            fflush(obuf);
      }
      trunc(obuf);
      if (ferror(obuf)) {
            warn("%s", mbox);
            (void)Fclose(obuf);
            (void)Fclose(fbuf);
            spool_unlock();
            return(-1);
      }
      (void)Fclose(obuf);
      if (mcount == 1)
            printf("Saved 1 message in %s\n", mbox);
      else
            printf("Saved %d messages in %s\n", mcount, mbox);

      /*
       * Now we are ready to copy back preserved files to
       * the system mailbox, if any were requested.
       */
      if (p != 0) {
            writeback(rbuf);
            (void)Fclose(fbuf);
            spool_unlock();
            return(0);
      }

      /*
       * Finally, remove his /var/mail file.
       * If new mail has arrived, copy it back.
       */
cream:
      if (rbuf != NULL) {
            abuf = Fopen(mailname, "r+");
            if (abuf == NULL)
                  goto newmail;
            while ((c = getc(rbuf)) != EOF)
                  (void)putc(c, abuf);
            (void)Fclose(rbuf);
            trunc(abuf);
            (void)Fclose(abuf);
            alter(mailname);
            (void)Fclose(fbuf);
            spool_unlock();
            return(0);
      }
      demail();
      (void)Fclose(fbuf);
      spool_unlock();
      return(0);

newmail:
      puts("Thou hast new mail.");
      if (fbuf != NULL) {
            (void)Fclose(fbuf);
            spool_unlock();
      }
      return(0);
}

/*
 * Preserve all the appropriate messages back in the system
 * mailbox, and print a nice message indicated how many were
 * saved.  On any error, just return -1.  Else return 0.
 * Incorporate the any new mail that we found.
 */
int
writeback(FILE *res)
{
      struct message *mp;
      int p, c;
      FILE *obuf;

      p = 0;
      if ((obuf = Fopen(mailname, "r+")) == NULL) {
            warn("%s", mailname);
            return(-1);
      }
#ifndef APPEND
      if (res != NULL)
            while ((c = getc(res)) != EOF)
                  (void)putc(c, obuf);
#endif
      for (mp = &message[0]; mp < &message[msgCount]; mp++)
            if ((mp->m_flag&MPRESERVE)||(mp->m_flag&MTOUCH)==0) {
                  p++;
                  if (sendmessage(mp, obuf, NULL, NULL) < 0) {
                        warn("%s", mailname);
                        (void)Fclose(obuf);
                        return(-1);
                  }
            }
#ifdef APPEND
      if (res != NULL)
            while ((c = getc(res)) != EOF)
                  (void)putc(c, obuf);
#endif
      fflush(obuf);
      trunc(obuf);
      if (ferror(obuf)) {
            warn("%s", mailname);
            (void)Fclose(obuf);
            return(-1);
      }
      if (res != NULL)
            (void)Fclose(res);
      (void)Fclose(obuf);
      alter(mailname);
      if (p == 1)
            printf("Held 1 message in %s\n", mailname);
      else
            printf("Held %d messages in %s\n", p, mailname);
      return(0);
}

/*
 * Terminate an editing session by attempting to write out the user's
 * file from the temporary.  Save any new stuff appended to the file.
 */
int
edstop(void)
{
      int gotcha, c;
      struct message *mp;
      FILE *obuf, *ibuf, *readstat = NULL;
      struct stat statb;
      char tempname[PATHSIZE];

      if (readonly)
            return(0);
      holdsigs();
      if (Tflag != NULL) {
            if ((readstat = Fopen(Tflag, "w")) == NULL)
                  Tflag = NULL;
      }
      for (mp = &message[0], gotcha = 0; mp < &message[msgCount]; mp++) {
            if (mp->m_flag & MNEW) {
                  mp->m_flag &= ~MNEW;
                  mp->m_flag |= MSTATUS;
            }
            if (mp->m_flag & (MODIFY|MDELETED|MSTATUS))
                  gotcha++;
            if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
                  char *id;

                  if ((id = hfield("article-id", mp)) != NULL)
                        fprintf(readstat, "%s\n", id);
            }
      }
      if (Tflag != NULL)
            (void)Fclose(readstat);
      if (!gotcha || Tflag != NULL)
            goto done;
      ibuf = NULL;
      if (stat(mailname, &statb) >= 0 && statb.st_size > mailsize) {
            int fd;

            (void)snprintf(tempname, sizeof(tempname), "%s/mbox.XXXXXXXXXX",
                tmpdir);
            if ((fd = mkstemp(tempname)) == -1 ||
                (obuf = Fdopen(fd, "w")) == NULL) {
                  warn("%s", tempname);
                  if (fd != -1)
                        close(fd);
                  relsesigs();
                  return(-1);
            }
            if ((ibuf = Fopen(mailname, "r")) == NULL) {
                  warn("%s", mailname);
                  (void)Fclose(obuf);
                  (void)rm(tempname);
                  relsesigs();
                  return(-1);
            }
            fseek(ibuf, (long)mailsize, SEEK_SET);
            while ((c = getc(ibuf)) != EOF)
                  (void)putc(c, obuf);
            (void)Fclose(ibuf);
            (void)Fclose(obuf);
            if ((ibuf = Fopen(tempname, "r")) == NULL) {
                  warn("%s", tempname);
                  (void)rm(tempname);
                  relsesigs();
                  return(-1);
            }
            (void)rm(tempname);
      }
      printf("\"%s\" ", mailname);
      fflush(stdout);
      if ((obuf = Fopen(mailname, "r+")) == NULL) {
            warn("%s", mailname);
            relsesigs();
            return(-1);
      }
      trunc(obuf);
      c = 0;
      for (mp = &message[0]; mp < &message[msgCount]; mp++) {
            if ((mp->m_flag & MDELETED) != 0)
                  continue;
            c++;
            if (sendmessage(mp, obuf, NULL, NULL) < 0) {
                  warn("%s", mailname);
                  relsesigs();
                  return(-1);
            }
      }
      gotcha = (c == 0 && ibuf == NULL);
      if (ibuf != NULL) {
            while ((c = getc(ibuf)) != EOF)
                  (void)putc(c, obuf);
            (void)Fclose(ibuf);
      }
      fflush(obuf);
      if (ferror(obuf)) {
            warn("%s", mailname);
            relsesigs();
            return(-1);
      }
      (void)Fclose(obuf);
      if (gotcha) {
            (void)rm(mailname);
#ifdef DEBIAN
            puts("truncated");
#else       
            puts("removed");
#endif            
      } else
            puts("complete");
      fflush(stdout);

done:
      relsesigs();
      return(0);
}

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