mirror of
git://projects.qi-hardware.com/wernermisc.git
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88 lines
3.0 KiB
Diff
88 lines
3.0 KiB
Diff
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commit efedf0ad42d7d8989b62ec7c158b0a0a1f3b4197
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Author: Sebastien Bourdeauducq <sebastien@milkymist.org>
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Date: Fri Feb 24 23:04:56 2012 +0100
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Fix incorrect processing of DNS info from DHCP (revised patch)
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diff --git a/cpukit/libnetworking/rtems/rtems_dhcp.c b/cpukit/libnetworking/rtems/rtems_dhcp.c
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index 285ce1e..4039a48 100644
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--- a/cpukit/libnetworking/rtems/rtems_dhcp.c
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+++ b/cpukit/libnetworking/rtems/rtems_dhcp.c
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@@ -187,6 +187,35 @@ static const char dhcp_request_parameters[5] = { DHCP_SUBNET,
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DHCP_DNS,
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DHCP_HOST,
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DHCP_DOMAIN_NAME };
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+#define NUM_NAMESERVERS \
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+ (sizeof rtems_bsdnet_config.name_server / sizeof rtems_bsdnet_config.name_server[0])
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+static struct in_addr rtems_dhcpd_nameserver[NUM_NAMESERVERS];
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+static int rtems_dhcpd_nameserver_count = 0;
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+
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+/*
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+ * Clean any DNS entries add by a DHCP request.
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+ */
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+static void
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+clean_dns_entries (void)
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+{
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+ int e;
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+ for (e = 0; e < rtems_dhcpd_nameserver_count; ++e)
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+ {
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+ int n;
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+ for (n = 0; n < rtems_bsdnet_nameserver_count; ++ n)
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+ {
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+ if (memcmp (&rtems_dhcpd_nameserver[e], &rtems_bsdnet_nameserver[n], 4) == 0)
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+ {
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+ if (n < (NUM_NAMESERVERS - 1))
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+ memmove (&rtems_bsdnet_nameserver[n],
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+ &rtems_bsdnet_nameserver[n + 1],
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+ (NUM_NAMESERVERS - n - 1) * 4);
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+ --rtems_bsdnet_nameserver_count;
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+ }
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+ }
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+ }
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+ rtems_dhcpd_nameserver_count = 0;
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+}
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/*
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* Format an IP address in dotted decimal.
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@@ -345,10 +374,12 @@ process_options (unsigned char *optbuf, int optbufSize)
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{
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int dlen = 0;
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while ((dlen < len) &&
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- (rtems_bsdnet_nameserver_count <
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- sizeof rtems_bsdnet_config.name_server /
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- sizeof rtems_bsdnet_config.name_server[0]))
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+ (rtems_dhcpd_nameserver_count < NUM_NAMESERVERS) &&
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+ (rtems_bsdnet_nameserver_count < NUM_NAMESERVERS))
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{
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+ memcpy (&rtems_dhcpd_nameserver
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+ [rtems_dhcpd_nameserver_count], p + dlen, 4);
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+ rtems_dhcpd_nameserver_count++;
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memcpy (&rtems_bsdnet_nameserver
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[rtems_bsdnet_nameserver_count], p + dlen, 4);
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rtems_bsdnet_nameserver_count++;
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@@ -725,6 +756,15 @@ dhcp_task (rtems_task_argument _sdl)
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continue;
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}
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+ /*
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+ * We have an ack. Clear the DNS entries that have been assigned by a previous
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+ * DHCP request.
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+ */
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+ clean_dns_entries ();
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+
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+ /*
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+ * Process this requests options.
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+ */
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process_options (&dhcp_req.vend[4], sizeof (dhcp_req.vend) - 4);
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if (dhcp_message_type != DHCP_ACK)
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@@ -839,6 +879,8 @@ dhcp_init (int update_files)
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struct sockaddr_dl *sdl = NULL;
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struct proc *procp = NULL;
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+ clean_dns_entries();
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+
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/*
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* If we are to update the files create the root
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* file structure.
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