1 This patch adds a forward lookup of any hostnames listed in the
2 "hosts allow" or "hosts deny" daemon config options. Based on
3 a patch by Paul Williamson.
5 To use this patch, run these commands for a successful build:
7 patch -p1 <patches/daemon-forward-lookup.diff
8 ./configure (optional if already run)
11 diff --git a/access.c b/access.c
14 @@ -210,6 +210,42 @@ static int match_address(char *addr, char *tok)
18 +static int match_hostlookup(char *addr, char *tok)
20 + struct hostent *hp = NULL;
21 + unsigned int i, len;
24 + if ((p = strchr(tok,'/')) != NULL) {
30 + /* Fail quietly (hp left NULL) if tok is an address, not a hostname. */
32 + if (strchr(tok, ':') != NULL) {
36 + if (strspn(tok, ".0123456789") != len)
37 + hp = gethostbyname(tok);
45 + for (i = 0; hp->h_addr_list[i] != NULL; i++) {
46 + tok = inet_ntoa(*(struct in_addr*)(hp->h_addr_list[i]));
47 + if (match_address(addr, tok))
54 static int access_match(char *list, char *addr, char *host)
57 @@ -223,7 +259,7 @@ static int access_match(char *list, char *addr, char *host)
60 for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) {
61 - if (match_hostname(host, tok) || match_address(addr, tok)) {
62 + if (match_hostname(host, tok) || match_address(addr, tok) || match_hostlookup(addr, tok)) {