src/patches/dnsmasq/011-Catch_errors_from_sendmsg_in_DHCP_code.patch

   1 From 98079ea89851da1df4966dfdfa1852a98da02912 Mon Sep 17 00:00:00 2001
   2 From: Simon Kelley <simon@thekelleys.org.uk>
   3 Date: Tue, 13 Oct 2015 20:30:32 +0100
   4 Subject: [PATCH] Catch errors from sendmsg in DHCP code.  Logs, eg,  iptables
   5  DROPS of dest 255.255.255.255
   6
   7 ---
   8  src/dhcp.c |    7 ++++++-
   9  1 file changed, 6 insertions(+), 1 deletion(-)
  10
  11 diff --git a/src/dhcp.c b/src/dhcp.c
  12 index e6fceb1..1c85e42 100644
  13 --- a/src/dhcp.c
  14 +++ b/src/dhcp.c
  15 @@ -452,8 +452,13 @@ void dhcp_packet(time_t now, int pxe_fd)
  16  #endif
  17
  18    while(retry_send(sendmsg(fd, &msg, 0)));
  19 +
  20 +  /* This can fail when, eg, iptables DROPS destination 255.255.255.255 */
  21 +  if (errno != 0)
  22 +    my_syslog(MS_DHCP | LOG_WARNING, _("Error sending DHCP packet to %s: %s"),
  23 +             inet_ntoa(dest.sin_addr), strerror(errno));
  24  }
  25 -
  26 +
  27  /* check against secondary interface addresses */
  28  static int check_listen_addrs(struct in_addr local, int if_index, char *label,
  29                               struct in_addr netmask, struct in_addr broadcast, void *vparam)
  30 --
  31 1.7.10.4
  32