int DotLock::attemptlock(const char *templock, const char *finallock)
{
Mio mio;
Buffer b;
static Buffer errbuf;
if (mio.Open(templock, O_CREAT | O_WRONLY, 0644) < 0)
{
errbuf="Unable to create a dot-lock at ";
errbuf += (const char *)templock;
errbuf += ".\n";
errbuf += '\0';
throw (const char *)errbuf;
}
b.append( (unsigned long)getpid() );
b += '\n';
if (mio.write((const char *)b, b.Length()) < 0 || mio.flush() < 0)
{
mio.Close();
unlink(templock);
throw "Unable to write to a dot-lock.";
}
mio.Close();
if (mio.errflag())
{
unlink(templock);
throw "Unable to close a dot-lock.";
}
try
{
struct stat buf;
if (link(templock, finallock) < 0)
; /* ignored */
int rc=stat(templock, &buf);
if (rc == 0 && buf.st_nlink == 2)
{
name(finallock);
unlink(templock);
return (0);
}
unlink(templock);
}
catch (...)
{
unlink(templock);
throw;
}
return (-1);
}
int delivery(const char *mailbox)
{
FormatMbox format_mbox;
if (format_mbox.HasMsg()) return (0);
DeliverDotLock dotlock;
Buffer b;
if ( *mailbox == '!' || *mailbox == '|' )
{
Buffer cmdbuf;
if (*mailbox == '!')
{
b="SENDMAIL";
const char *sendmail=GetVarStr(b);
cmdbuf=sendmail;
cmdbuf += " -f '' ";
cmdbuf += mailbox+1;
}
else
cmdbuf= mailbox+1;
cmdbuf += '\0';
if (VerboseLevel() > 0)
merr << "maildrop: Delivering to |" <<
(const char *)cmdbuf << "\n";
PipeFds pipe;
if (pipe.Pipe())
throw "Cannot create pipe.";
pid_t pid=fork();
if (pid < 0)
throw "Cannot fork.";
if (pid == 0)
{
pipe.close1();
dup2(pipe.fds[0], 0);
pipe.close0();
try
{
subshell(cmdbuf);
}
catch (const char *p)
{
if (write(2, p, strlen(p)) < 0 ||
write(2, "\n", 1) < 0)
; /* ignored */
_exit(100);
}
#if NEED_NONCONST_EXCEPTIONS
catch (char *p)
{
if (write(2, p, strlen(p)) < 0 ||
write(2, "\n", 1) < 0)
; /* ignored */
_exit(100);
}
#endif
catch (...)
{
_exit(100);
}
}
Mio pipemio;
pipe.close0();
pipemio.fd(pipe.fds[1]);
pipe.fds[1]= -1;
format_mbox.Init(0);
int rc=format_mbox.DeliverTo(pipemio);
int wait_stat;
while (wait(&wait_stat) != pid)
;
if (wait_stat == 0)
rc=0;
log(mailbox, rc || wait_stat, format_mbox);
{
Buffer name, val;
if (rc) wait_stat= -1;
else wait_stat= WIFEXITED(wait_stat)
? WEXITSTATUS(wait_stat):-1;
val.append( (unsigned long)wait_stat);
name="EXITCODE";
SetVar(name, val);
}
if (rc) return (-1);
}
else if (Maildir::IsMaildir(mailbox))
{
Maildir deliver_maildir;
Mio deliver_file;
if ( deliver_maildir.MaildirOpen(mailbox, deliver_file,
maildrop.msgptr->MessageSize()) < 0)
{
#if HAVE_COURIER
throw 75;
#else
throw 77;
#endif
}
format_mbox.Init(0);
if (format_mbox.DeliverTo(deliver_file))
{
log(mailbox, -1, format_mbox);
return (-1);
}
deliver_maildir.MaildirSave();
log(mailbox, 0, format_mbox);
}
else // Delivering to a mailbox (hopefully)
{
if (VerboseLevel() > 0)
merr << "maildrop: Delivering to " << mailbox << "\n";
#if USE_DOTLOCK
dotlock.LockMailbox(mailbox);
#endif
struct stat stat_buf;
Mio mio;
Buffer name_buf;
name_buf="UMASK";
const char *um=GetVarStr(name_buf);
unsigned int umask_val=077;
sscanf(um, "%o", &umask_val);
umask_val=umask(umask_val);
if (mio.Open(mailbox, O_CREAT | O_WRONLY, 0666) < 0)
{
umask_val=umask(umask_val);
throw "Unable to open mailbox.";
}
umask_val=umask(umask_val);
if (fstat(mio.fd(), &stat_buf) < 0)
throw "Unable to open mailbox.";
#if USE_FLOCK
if (VerboseLevel() > 4)
merr << "maildrop: Flock()ing " << mailbox << ".\n";
FileLock::do_filelock(mio.fd());
#endif
if (S_ISREG(stat_buf.st_mode))
{
if (mio.seek(0L, SEEK_END) < 0)
throw "Seek error on mailbox.";
dotlock.trap_truncate(mio.fd(), stat_buf.st_size);
}
if (VerboseLevel() > 4)
merr << "maildrop: Appending to " << mailbox << ".\n";
try
{
format_mbox.Init(1);
if ((stat_buf.st_size > 0 &&
mio.write(
#if CRLF_TERM
"\r\n", 2
#else
"\n", 1
#endif
) < 0) ||
format_mbox.DeliverTo(mio))
{
dotlock.truncate();
log(mailbox, -1, format_mbox);
return (-1);
}
}
catch (...)
{
dotlock.truncate();
log(mailbox, -1, format_mbox);
throw;
}
log(mailbox, 0, format_mbox);
}
if (VerboseLevel() > 4)
merr << "maildrop: Delivery complete.\n";
return (0);
}