BUG/MINOR: http_fetch: make hdr_ip() resistant to empty fields
The fix in commit 7b0e00d94 ("BUG/MINOR: http_fetch: make hdr_ip() reject
trailing characters") made hdr_ip() more sensitive to empty fields, for
example if a trusted proxy incorrectly sends the header with an empty
value, we could return 0.0.0.0 which is not correct. Let's make sure we
only assign an IPv4 type here when a non-empty address was found.
This should be backported to all branches where the fix above was
backported.
diff --git a/src/http_fetch.c b/src/http_fetch.c
index a416945..6c569a7 100644
--- a/src/http_fetch.c
+++ b/src/http_fetch.c
@@ -1004,7 +1004,7 @@
smp->data.u.str.data);
temp->area[smp->data.u.str.data] = '\0';
len = url2ipv4((char *) temp->area, &smp->data.u.ipv4);
- if (len == smp->data.u.str.data) {
+ if (len > 0 && len == smp->data.u.str.data) {
/* plain IPv4 address */
smp->data.type = SMP_T_IPV4;
break;