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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001, 2002, 2005, 2007, 2010 Free Software
Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <mailutils/mailutils.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
struct sockaddr *target_sa;
int target_salen;
mu_acl_t acl;
struct sockaddr *
parse_address (int *psalen, char *str)
{
struct sockaddr_in in;
struct sockaddr *sa;
in.sin_family = AF_INET;
if (inet_aton (str, &in.sin_addr) == 0)
{
mu_error ("Invalid IPv4: %s", str);
exit (1);
}
in.sin_port = 0;
*psalen = sizeof (in);
sa = malloc (*psalen);
if (!sa)
{
mu_error ("%s", mu_strerror (errno));
exit (1);
}
memcpy (sa, &in, sizeof (in));
return sa;
}
void
read_rules (FILE *fp)
{
char buf[512];
int line = 0;
int wsflags = MU_WRDSF_DEFFLAGS | MU_WRDSF_COMMENT;
struct mu_wordsplit ws;
int rc;
rc = mu_acl_create (&acl);
if (rc)
{
mu_error ("cannot create acl: %s", mu_strerror (rc));
exit (1);
}
ws.ws_comment = "#";
while (fgets (buf, sizeof buf, fp))
{
unsigned long netmask;
int salen;
struct sockaddr *sa;
mu_acl_action_t action;
void *data = NULL;
char *p;
int len = strlen (buf);
if (len == 0)
continue;
if (buf[len-1] != '\n')
{
mu_error ("%d: line too long", line);
continue;
}
buf[len-1] = 0;
line++;
if (buf[0] == '#')
continue;
if (mu_wordsplit (buf, &ws, wsflags))
{
mu_error ("cannot split line `%s': %s", buf,
mu_wordsplit_strerror (&ws));
continue;
}
wsflags |= MU_WRDSF_REUSE;
if (ws.ws_wordc < 2)
{
mu_error ("%d: invalid input", line);
continue;
}
p = strchr (ws.ws_wordv[1], '/');
if (p)
{
char *q;
unsigned netlen;
*p++ = 0;
netlen = strtoul (p, &q, 10);
if (*q == 0)
{
if (netlen == 0)
netmask = 0;
else
{
netmask = 0xfffffffful >> (32 - netlen);
netmask <<= (32 - netlen);
netmask = htonl (netmask);
}
}
else if (*q == '.')
{
struct in_addr addr;
if (inet_aton (p, &addr) == 0)
{
mu_error ("%d: invalid netmask", line);
continue;
}
netmask = addr.s_addr;
}
else
{
mu_error ("%d: invalid netmask", line);
continue;
}
}
else
netmask = 0xfffffffful;
sa = parse_address (&salen, ws.ws_wordv[1]);
/* accept addr
deny addr
log addr [rest ...]
exec addr [rest ...]
execif addr rest ....]
*/
if (mu_acl_string_to_action (ws.ws_wordv[0], &action))
{
mu_error ("%d: invalid command", line);
continue;
}
switch (action)
{
case mu_acl_accept:
case mu_acl_deny:
break;
case mu_acl_log:
case mu_acl_exec:
case mu_acl_ifexec:
data = strdup (ws.ws_wordv[2]);
}
rc = mu_acl_append (acl, action, data, sa, salen, netmask);
if (rc)
mu_error ("%d: cannot append acl entry: %s", line,
mu_strerror (rc));
}
mu_wordsplit_free (&ws);
}
int
main (int argc, char **argv)
{
int rc;
FILE *file = NULL;
mu_acl_result_t result;
mu_set_program_name (argv[0]);
while ((rc = getopt (argc, argv, "Dd:a:f:")) != EOF)
{
switch (rc)
{
case 'D':
mu_debug_line_info = 1;
break;
case 'd':
mu_debug_parse_spec (optarg);
break;
case 'a':
target_sa = parse_address (&target_salen, optarg);
break;
case 'f':
file = fopen (optarg, "r");
if (file == 0)
{
mu_error ("cannot open file %s: %s", optarg,
mu_strerror (errno));
exit (1);
}
break;
default:
exit (1);
}
}
argv += optind;
argc -= optind;
read_rules (file ? file : stdin);
rc = mu_acl_check_sockaddr (acl, target_sa, target_salen, &result);
if (rc)
{
mu_error ("mu_acl_check_sockaddr failed: %s", mu_strerror (rc));
exit (1);
}
switch (result)
{
case mu_acl_result_undefined:
puts ("undefined");
break;
case mu_acl_result_accept:
puts ("accept");
break;
case mu_acl_result_deny:
puts ("deny");
break;
}
exit (0);
}
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