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| author | Denys Vlasenko | 2016-09-15 13:20:51 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2016-09-15 13:20:51 +0200 |
| commit | 7cef4817d6d6d61a1166ed7dfc13537b95c65970 (patch) | |
| tree | 8dedd8f5e9584129cf54179ddd29ef2042a3923e | |
| parent | 3a45b87ac36f60962d6d19c592813e186a9e82e6 (diff) | |
| download | busybox-7cef4817d6d6d61a1166ed7dfc13537b95c65970.zip busybox-7cef4817d6d6d61a1166ed7dfc13537b95c65970.tar.gz | |
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>
| -rw-r--r-- | libbb/udp_io.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/libbb/udp_io.c b/libbb/udp_io.c index a32af9b..6e3ef48 100644 --- a/libbb/udp_io.c +++ b/libbb/udp_io.c @@ -70,7 +70,13 @@ send_to_from(int fd, void *buf, size_t len, int flags, 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 len, int flags, 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; |