From 7981d79ef0bea5c8224edd949157be57ffd1173a Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 20 Oct 2011 10:34:05 +0200 Subject: [PATCH] udhcpc: small code shrink function old new delta udhcp_recv_raw_packet 430 425 -5 Signed-off-by: Denys Vlasenko --- networking/udhcp/dhcpc.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index 311d4867a..b84196926 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -802,7 +802,8 @@ static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd) bytes = ntohs(packet.ip.tot_len); /* make sure its the right packet for us, and that it passes sanity checks */ - if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION + if (packet.ip.protocol != IPPROTO_UDP + || packet.ip.version != IPVERSION || packet.ip.ihl != (sizeof(packet.ip) >> 2) || packet.udp.dest != htons(CLIENT_PORT) /* || bytes > (int) sizeof(packet) - can't happen */ @@ -831,15 +832,17 @@ static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd) return -2; } - memcpy(dhcp_pkt, &packet.data, bytes - (sizeof(packet.ip) + sizeof(packet.udp))); - - if (dhcp_pkt->cookie != htonl(DHCP_MAGIC)) { + if (packet.data.cookie != htonl(DHCP_MAGIC)) { bb_info_msg("Packet with bad magic, ignoring"); return -2; } + log1("Got valid DHCP packet"); - udhcp_dump_packet(dhcp_pkt); - return bytes - (sizeof(packet.ip) + sizeof(packet.udp)); + udhcp_dump_packet(&packet.data); + + bytes -= sizeof(packet.ip) + sizeof(packet.udp); + memcpy(dhcp_pkt, &packet.data, bytes); + return bytes; }