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From 7cef4817d6d6d61a1166ed7dfc13537b95c65970 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Thu, 15 Sep 2016 13:20:51 +0200
Subject: [PATCH] libbb:/send_to_from: do not require that "to" should have the
same AF. Closes 9146
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
libbb/udp_io.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/libbb/udp_io.c
+++ b/libbb/udp_io.c
@@ -70,7 +70,13 @@ send_to_from(int fd, void *buf, size_t l
msg.msg_flags = flags;
cmsgptr = CMSG_FIRSTHDR(&msg);
- if (to->sa_family == AF_INET && from->sa_family == AF_INET) {
+ /*
+ * Users report that to->sa_family can be AF_INET6 too,
+ * if "to" was acquired by recv_from_to(). IOW: recv_from_to()
+ * was seen showing IPv6 "from" even when the destination
+ * of received packet (our local address) was IPv4.
+ */
+ if (/* to->sa_family == AF_INET && */ from->sa_family == AF_INET) {
struct in_pktinfo *pktptr;
cmsgptr->cmsg_level = IPPROTO_IP;
cmsgptr->cmsg_type = IP_PKTINFO;
@@ -86,7 +92,7 @@ send_to_from(int fd, void *buf, size_t l
pktptr->ipi_spec_dst = ((struct sockaddr_in*)from)->sin_addr;
}
# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
- else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
+ else if (/* to->sa_family == AF_INET6 && */ from->sa_family == AF_INET6) {
struct in6_pktinfo *pktptr;
cmsgptr->cmsg_level = IPPROTO_IPV6;
cmsgptr->cmsg_type = IPV6_PKTINFO;
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