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/*
** Copyright 1998 - 2008 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include "config.h"
#include "funcs.h"
#include "deliverdotlock.h"
#include "mio.h"
#include "formatmbox.h"
#include "xconfig.h"
#include "varlist.h"
#include "pipefds.h"
#include "log.h"
#include "exittrap.h"
#include "maildir.h"
#include "filelock.h"
#include "setgroupid.h"
#include <sys/types.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include "mywait.h"
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
///////////////////////////////////////////////////////////////////////////
//
// Deliver to a mailbox, a file, or a maildir.
//
// If there was a delivery error, error message is printed, and we
// return -1.
//
// If delivery was succesfull, 0 is returned.
//
///////////////////////////////////////////////////////////////////////////
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)
{
throw 75;
}
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);
}
void subshell(const char *cmd)
{
Buffer b;
b="SHELL";
const char *shell=GetVarStr(b);
const char *p, *q;
for (p=q=shell; *p; p++)
if (*p == SLASH_CHAR) q=p+1;
char **env=ExportEnv();
int n;
for (n=0; n<NSIG; n++)
signal(n, SIG_DFL);
if (setgroupid(getgid()) < 0 ||
setuid(getuid()) < 0)
{
perror("setuid/setgid");
_exit(100);
}
ExitTrap::onfork();
execle(shell, q, "-c", cmd, (const char *)0, env);
if (write (2, "Unable to execute ", 18) < 0 ||
write (2, shell, strlen(shell)) < 0 ||
write (2, "\n", 1) < 0)
; /* ignored */
_exit(100);
}
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