diff options
Diffstat (limited to 'package/network/services/dnsmasq/patches/0048-Fix-cmsg-3-API-usage-on-OpenBSD.patch')
| -rw-r--r-- | package/network/services/dnsmasq/patches/0048-Fix-cmsg-3-API-usage-on-OpenBSD.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/package/network/services/dnsmasq/patches/0048-Fix-cmsg-3-API-usage-on-OpenBSD.patch b/package/network/services/dnsmasq/patches/0048-Fix-cmsg-3-API-usage-on-OpenBSD.patch new file mode 100644 index 0000000000..77d90fd0c3 --- /dev/null +++ b/package/network/services/dnsmasq/patches/0048-Fix-cmsg-3-API-usage-on-OpenBSD.patch @@ -0,0 +1,52 @@ +From c6cc455dd191fbea56ee14a0ef88a7d655a6fe9a Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?J=C3=A9r=C3=A9mie=20Courr=C3=A8ges-Anglas?= <jca@wxcvbn.org> +Date: Fri, 22 Mar 2019 10:56:13 +0100 +Subject: [PATCH 48/57] Fix cmsg(3) API usage on OpenBSD + +msg_controllen should be set using CMSG_SPACE() to account for padding. +RFC3542 provides more details: + + While sending an application may or may not include padding at the end + of last ancillary data in msg_controllen and implementations must + accept both as valid. + +At least OpenBSD rejects control messages if msg_controllen doesn't +account for padding, so use CMSG_SPACE() for maximal portability. This +is consistent with the example provided in the Linux cmsg(3) manpage. + +Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> +--- + src/forward.c | 9 ++++++--- + 1 file changed, 6 insertions(+), 3 deletions(-) + +--- a/src/forward.c ++++ b/src/forward.c +@@ -65,13 +65,15 @@ int send_from(int fd, int nowild, char * + struct in_pktinfo p; + p.ipi_ifindex = 0; + p.ipi_spec_dst = source->addr4; ++ msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo)); + memcpy(CMSG_DATA(cmptr), &p, sizeof(p)); +- msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); ++ cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); + cmptr->cmsg_level = IPPROTO_IP; + cmptr->cmsg_type = IP_PKTINFO; + #elif defined(IP_SENDSRCADDR) ++ msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr)); + memcpy(CMSG_DATA(cmptr), &(source->addr4), sizeof(source->addr4)); +- msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); ++ cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); + cmptr->cmsg_level = IPPROTO_IP; + cmptr->cmsg_type = IP_SENDSRCADDR; + #endif +@@ -81,8 +83,9 @@ int send_from(int fd, int nowild, char * + struct in6_pktinfo p; + p.ipi6_ifindex = iface; /* Need iface for IPv6 to handle link-local addrs */ + p.ipi6_addr = source->addr6; ++ msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); + memcpy(CMSG_DATA(cmptr), &p, sizeof(p)); +- msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); ++ cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); + cmptr->cmsg_type = daemon->v6pktinfo; + cmptr->cmsg_level = IPPROTO_IPV6; + } |