udhcp: added some FIXMEs; code shrink. -49 bytes

diff --git a/networking/udhcp/clientpacket.c b/networking/udhcp/clientpacket.c
index 77331d9..1ab1732 100644 (file)
--- a/networking/udhcp/clientpacket.c
+++ b/networking/udhcp/clientpacket.c
@@ -79,8 +79,18 @@ static void add_param_req_option(struct dhcpMessage *packet)
 }
 
 
+static int raw_bcast_from_client_config_ifindex(struct dhcpMessage *packet)
+{
+       return udhcp_send_raw_packet(packet,
+               /*src*/ INADDR_ANY, CLIENT_PORT,
+               /*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR,
+               client_config.ifindex);
+}
+
+
 #if ENABLE_FEATURE_UDHCPC_ARPING
-/* Unicast a DHCP decline message */
+/* Broadcast a DHCP decline message */
+//FIXME: maybe it should be unicast?
 int FAST_FUNC send_decline(uint32_t xid, uint32_t server, uint32_t requested)
 {
        struct dhcpMessage packet;
@@ -92,8 +102,7 @@ int FAST_FUNC send_decline(uint32_t xid, uint32_t server, uint32_t requested)
 
        bb_info_msg("Sending decline...");
 
-       return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-               SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+       return raw_bcast_from_client_config_ifindex(&packet);
 }
 #endif
 
@@ -114,13 +123,13 @@ int FAST_FUNC send_discover(uint32_t xid, uint32_t requested)
        add_param_req_option(&packet);
 
        bb_info_msg("Sending discover...");
-       return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-                       SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+       return raw_bcast_from_client_config_ifindex(&packet);
 }
 
 
 /* Broadcasts a DHCP request message */
-int FAST_FUNC send_selecting(uint32_t xid, uint32_t server, uint32_t requested)
+//FIXME: maybe it should be unicast?
+int FAST_FUNC send_select(uint32_t xid, uint32_t server, uint32_t requested)
 {
        struct dhcpMessage packet;
        struct in_addr addr;
@@ -134,8 +143,7 @@ int FAST_FUNC send_selecting(uint32_t xid, uint32_t server, uint32_t requested)
 
        addr.s_addr = requested;
        bb_info_msg("Sending select for %s...", inet_ntoa(addr));
-       return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-                               SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+       return raw_bcast_from_client_config_ifindex(&packet);
 }
 
 
@@ -151,10 +159,11 @@ int FAST_FUNC send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
        add_param_req_option(&packet);
        bb_info_msg("Sending renew...");
        if (server)
-               return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
+               return udhcp_send_kernel_packet(&packet,
+                       ciaddr, CLIENT_PORT,
+                       server, SERVER_PORT);
 
-       return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-                               SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+       return raw_bcast_from_client_config_ifindex(&packet);
 }
 
 

diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index bf099d8..68fa65c 100644 (file)
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -66,8 +66,9 @@ int udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd) FAST_FUNC;
 
 int udhcp_send_raw_packet(struct dhcpMessage *payload,
                uint32_t source_ip, int source_port,
-               uint32_t dest_ip, int dest_port,
-               const uint8_t *dest_arp, int ifindex) FAST_FUNC;
+               uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
+               int ifindex) FAST_FUNC;
+
 int udhcp_send_kernel_packet(struct dhcpMessage *payload,
                uint32_t source_ip, int source_port,
                uint32_t dest_ip, int dest_port) FAST_FUNC;

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 5ec8d39..c1ef195 100644 (file)
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -389,7 +389,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
                                        if (state == RENEW_REQUESTED) /* unicast */
                                                send_renew(xid, server_addr, requested_ip);
                                        else /* broadcast */
-                                               send_selecting(xid, server_addr, requested_ip);
+                                               send_select(xid, server_addr, requested_ip);
 
                                        timeout = discover_timeout;
                                        packet_num++;
@@ -430,7 +430,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
                                 * try to find DHCP server using broadcast */
                                if (timeout > 0) {
                                        /* send a request packet */
-                                       send_renew(xid, 0, requested_ip); /* broadcast */
+                                       send_renew(xid, 0 /* INADDR_ANY*/, requested_ip); /* broadcast */
                                        timeout >>= 1;
                                        continue;
                                }
@@ -529,6 +529,8 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
                                                if (lease_seconds < 10) /* and not too small */
                                                        lease_seconds = 10;
                                        }
+//FIXME: why do we check ARP only after we've got DHCPACK?
+//Shouldn't we do it immediately after DHCPOFFER?
 #if ENABLE_FEATURE_UDHCPC_ARPING
                                        if (opt & OPT_a) {
                                                if (!arpping(packet.yiaddr,
@@ -538,6 +540,8 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
                                                ) {
                                                        bb_info_msg("offered address is in use "
                                                                "(got ARP reply), declining");
+//NB: not clear whether it should be unicast or bcast.
+//Currently it is a bcast. Why?
                                                        send_decline(xid, server_addr, packet.yiaddr);
 
                                                        if (state != REQUESTING)

diff --git a/networking/udhcp/dhcpc.h b/networking/udhcp/dhcpc.h
index 6ca4400..a934849 100644 (file)
--- a/networking/udhcp/dhcpc.h
+++ b/networking/udhcp/dhcpc.h
@@ -39,7 +39,7 @@ struct client_config_t {
 
 uint32_t random_xid(void) FAST_FUNC;
 int send_discover(uint32_t xid, uint32_t requested) FAST_FUNC;
-int send_selecting(uint32_t xid, uint32_t server, uint32_t requested) FAST_FUNC;
+int send_select(uint32_t xid, uint32_t server, uint32_t requested) FAST_FUNC;
 #if ENABLE_FEATURE_UDHCPC_ARPING
 int send_decline(uint32_t xid, uint32_t server, uint32_t requested) FAST_FUNC;
 #endif

diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index 58f45e5..4eedbb5 100644 (file)
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -118,7 +118,8 @@ uint16_t FAST_FUNC udhcp_checksum(void *addr, int count)
 /* Construct a ip/udp header for a packet, send packet */
 int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *payload,
                uint32_t source_ip, int source_port,
-               uint32_t dest_ip, int dest_port, const uint8_t *dest_arp, int ifindex)
+               uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
+               int ifindex)
 {
        struct sockaddr_ll dest;
        struct udp_dhcp_packet packet;

diff --git a/networking/udhcp/serverpacket.c b/networking/udhcp/serverpacket.c
index 2fcf930..5b1c615 100644 (file)
--- a/networking/udhcp/serverpacket.c
+++ b/networking/udhcp/serverpacket.c
@@ -59,8 +59,10 @@ static int send_packet_to_client(struct dhcpMessage *payload, int force_broadcas
                ciaddr = payload->yiaddr;
                chaddr = payload->chaddr;
        }
-       return udhcp_send_raw_packet(payload, server_config.server, SERVER_PORT,
-                       ciaddr, CLIENT_PORT, chaddr, server_config.ifindex);
+       return udhcp_send_raw_packet(payload,
+               /*src*/ server_config.server, SERVER_PORT,
+               /*dst*/ ciaddr, CLIENT_PORT, chaddr,
+               server_config.ifindex);
 }