diff options
Diffstat (limited to 'networking/udhcp/dhcpc.c')
| -rw-r--r-- | networking/udhcp/dhcpc.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index 8985cc7..2d48980 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -452,7 +452,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) } /* select() didn't timeout, something did happen. */ - /* Is is a packet? */ + /* Is it a packet? */ if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) { int len; /* A packet is ready, read it */ @@ -474,7 +474,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) continue; if (packet.xid != xid) { - DEBUG("Ignoring XID %x (our xid is %x)", + DEBUG("Ignoring xid %x (our xid is %x)", (unsigned)packet.xid, (unsigned)xid); continue; } @@ -524,17 +524,24 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) bb_error_msg("no lease time with ACK, using 1 hour lease"); lease_seconds = 60 * 60; } else { - /* can be misaligned, thus memcpy */ - memcpy(&lease_seconds, temp, 4); + /* it IS unaligned sometimes, don't "optimize" */ + lease_seconds = get_unaligned_u32p((uint32_t*)temp); lease_seconds = ntohl(lease_seconds); lease_seconds &= 0x0fffffff; /* paranoia: must not be prone to overflows */ 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) { +/* RFC 2131 3.1 paragraph 5: + * "The client receives the DHCPACK message with configuration + * parameters. The client SHOULD perform a final check on the + * parameters (e.g., ARP for allocated network address), and notes + * the duration of the lease specified in the DHCPACK message. At this + * point, the client is configured. If the client detects that the + * address is already in use (e.g., through the use of ARP), + * the client MUST send a DHCPDECLINE message to the server and restarts + * the configuration process..." */ if (!arpping(packet.yiaddr, (uint32_t) 0, client_config.arp, @@ -542,8 +549,6 @@ 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) @@ -568,7 +573,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) } requested_ip = packet.yiaddr; udhcp_run_script(&packet, - ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); + ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); state = BOUND; change_listen_mode(LISTEN_NONE); |