131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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hosts allow/deny code for rsync
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*/
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#include "rsync.h"
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static int match_hostname(char *host, char *tok)
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{
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if (!host || !*host) return 0;
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return (fnmatch(tok, host, 0) == 0);
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}
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static int match_address(char *addr, char *tok)
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{
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char *p;
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unsigned long a, t, mask = ~0;
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if (!addr || !*addr) return 0;
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if (!isdigit(tok[0])) return 0;
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p = strchr(tok,'/');
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if (p) *p = 0;
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a = inet_addr(addr);
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t = inet_addr(tok);
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if (p) {
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*p = '/';
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}
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if (t == INADDR_NONE) {
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rprintf(FERROR,"malformed address %s\n", tok);
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return 0;
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}
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a = ntohl(a);
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t = ntohl(t);
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if (p) {
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if (strchr(p+1,'.')) {
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mask = inet_addr(p+1);
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if (mask == INADDR_NONE) {
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rprintf(FERROR,"malformed mask in %s\n", tok);
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return 0;
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}
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mask = ntohl(mask);
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} else {
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int bits = atoi(p+1);
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if (bits <= 0 || bits > 32) {
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rprintf(FERROR,"malformed mask in %s\n", tok);
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return 0;
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}
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mask &= (mask << (32-bits));
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}
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}
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return ((a&mask) == (t&mask));
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}
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static int access_match(char *list, char *addr, char *host)
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{
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char *tok;
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char *list2 = strdup(list);
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if (!list2) out_of_memory("access_match");
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strlower(list2);
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if (host) strlower(host);
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for (tok=strtok(list2," ,\t"); tok; tok=strtok(NULL," ,\t")) {
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if (match_hostname(host, tok) || match_address(addr, tok)) {
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free(list2);
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return 1;
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}
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}
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free(list2);
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return 0;
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}
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int allow_access(char *addr, char *host, char *allow_list, char *deny_list)
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{
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/* if theres no deny list and no allow list then allow access */
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if ((!deny_list || !*deny_list) && (!allow_list || !*allow_list))
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return 1;
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/* if there is an allow list but no deny list then allow only hosts
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on the allow list */
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if (!deny_list || !*deny_list)
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return(access_match(allow_list, addr, host));
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/* if theres a deny list but no allow list then allow
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all hosts not on the deny list */
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if (!allow_list || !*allow_list)
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return(!access_match(deny_list,addr,host));
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/* if there are both type of list then allow all hosts on the
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allow list */
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if (access_match(allow_list,addr,host))
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return 1;
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/* if there are both type of list and it's not on the allow then
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allow it if its not on the deny */
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if (access_match(deny_list,addr,host))
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return 0;
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return 1;
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}
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