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/*
Copyright (C) Andrew Tridgell 1998
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
hosts allow/deny code for rsync
*/
#include "rsync.h"
static int match_hostname(char *host, char *tok)
{
if (!host || !*host) return 0;
return (fnmatch(tok, host, 0) == 0);
}
static int match_address(char *addr, char *tok)
{
char *p;
unsigned long a, t, mask = (unsigned long)~0;
if (!addr || !*addr) return 0;
if (!isdigit(tok[0])) return 0;
p = strchr(tok,'/');
if (p) *p = 0;
a = inet_addr(addr);
t = inet_addr(tok);
if (p) {
*p = '/';
}
if (t == INADDR_NONE) {
rprintf(FERROR,"malformed address %s\n", tok);
return 0;
}
a = ntohl(a);
t = ntohl(t);
if (p) {
if (strchr(p+1,'.')) {
mask = inet_addr(p+1);
if (mask == INADDR_NONE) {
rprintf(FERROR,"malformed mask in %s\n", tok);
return 0;
}
mask = ntohl(mask);
} else {
int bits = atoi(p+1);
if (bits <= 0 || bits > 32) {
rprintf(FERROR,"malformed mask in %s\n", tok);
return 0;
}
mask &= (mask << (32-bits));
}
}
return ((a&mask) == (t&mask));
}
static int access_match(char *list, char *addr, char *host)
{
char *tok;
char *list2 = strdup(list);
if (!list2) out_of_memory("access_match");
strlower(list2);
if (host) strlower(host);
for (tok=strtok(list2," ,\t"); tok; tok=strtok(NULL," ,\t")) {
if (match_hostname(host, tok) || match_address(addr, tok)) {
free(list2);
return 1;
}
}
free(list2);
return 0;
}
int allow_access(char *addr, char *host, char *allow_list, char *deny_list)
{
/* if theres no deny list and no allow list then allow access */
if ((!deny_list || !*deny_list) && (!allow_list || !*allow_list))
return 1;
/* if there is an allow list but no deny list then allow only hosts
on the allow list */
if (!deny_list || !*deny_list)
return(access_match(allow_list, addr, host));
/* if theres a deny list but no allow list then allow
all hosts not on the deny list */
if (!allow_list || !*allow_list)
return(!access_match(deny_list,addr,host));
/* if there are both type of list then allow all hosts on the
allow list */
if (access_match(allow_list,addr,host))
return 1;
/* if there are both type of list and it's not on the allow then
allow it if its not on the deny */
if (access_match(deny_list,addr,host))
return 0;
return 1;
}
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