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dnsd: fixes various segfaults.

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One was a lib api change that was not updated and another
is a stack buffer overflow.
It also adds support for '*' in dnsd.conf. It resolves all hostnames to
a specific ip address. This is useful if you for example want redirect
all http traffic to your first-boot-web-wizard on you router/firewall.

By Timo Teras
This commit is contained in:
Denis Vlasenko
2008-05-22 17:41:01 +00:00
parent ae84b11467
commit e9b76e1f1e
2 changed files with 16 additions and 9 deletions
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networking/dnsd.c
+5 -3
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@@ -194,7 +194,8 @@ static int table_lookup(uint16_t type, uint8_t * as, uint8_t * qs)
for (i = 1; i <= (int)(d->name[0]); i++)
if (tolower(qs[i]) != d->name[i])
break;
if (i > (int)(d->name[0])) {
if (i > (int)(d->name[0]) ||
(d->name[0] == 1 && d->name[1] == '*')) {
strcpy((char *)as, d->ip);
#if DEBUG
fprintf(stderr, " OK as:%s\n", as);
@@ -202,7 +203,8 @@ static int table_lookup(uint16_t type, uint8_t * as, uint8_t * qs)
return 0;
}
} else if (type == REQ_PTR) { /* search by IP-address */
if (!strncmp((char*)&d->rip[1], (char*)&qs[1], strlen(d->rip)-1)) {
if ((d->name[0] != 1 || d->name[1] != '*') &&
!strncmp((char*)&d->rip[1], (char*)&qs[1], strlen(d->rip)-1)) {
strcpy((char *)as, d->name);
return 0;
}
@@ -401,7 +403,7 @@ int dnsd_main(int argc ATTRIBUTE_UNUSED, char **argv)
r = process_packet(buf);
if (r <= 0)
continue;
send_to_from(udps, buf, r, 0, &to->u.sa, &from->u.sa, lsa->len);
send_to_from(udps, buf, r, 0, &from->u.sa, &to->u.sa, lsa->len);
}
return 0;
}