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udhcpc: emit "correct" secs field

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In theory, sending secs set to constant zero should be ok too.
But some bleeping servers can actually be configured to answer ONLY
if secs is bigger than a preset value (!!)
http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man8/bootpd.8.html
grep for "reply_threshold_seconds"

function                                             old     new   delta
udhcpc_main                                         2573    2623     +50

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-03-12 05:37:54 +01:00
parent ea684c6aaf
commit 9ac5596a51
2 changed files with 17 additions and 0 deletions
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14
networking/udhcp/dhcpc.c
View File

@ -407,11 +407,19 @@ static ALWAYS_INLINE uint32_t random_xid(void)
/* Initialize the packet with the proper defaults */
static void init_packet(struct dhcp_packet *packet, char type)
{
uint16_t secs;
/* Fill in: op, htype, hlen, cookie fields; message type option: */
udhcp_init_header(packet, type);
packet->xid = random_xid();
client_config.last_secs = monotonic_sec();
if (client_config.first_secs == 0)
client_config.first_secs = client_config.last_secs;
secs = client_config.last_secs - client_config.first_secs;
packet->secs = htons(secs);
memcpy(packet->chaddr, client_config.client_mac, 6);
if (client_config.clientid)
udhcp_add_binary_option(packet, client_config.clientid);
@ -848,6 +856,7 @@ static void change_listen_mode(int new_mode)
/* else LISTEN_NONE: sockfd stays closed */
}
/* Called only on SIGUSR1 */
static void perform_renew(void)
{
bb_info_msg("Performing a DHCP renew");
@ -1260,6 +1269,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
case BOUND:
/* 1/2 lease passed, enter renewing state */
state = RENEWING;
client_config.first_secs = 0; /* make secs field count from 0 */
change_listen_mode(LISTEN_KERNEL);
log1("Entering renew state");
/* fall right through */
@ -1299,6 +1309,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
bb_info_msg("Lease lost, entering init state");
udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
client_config.first_secs = 0; /* make secs field count from 0 */
/*timeout = 0; - already is */
packet_num = 0;
continue;
@ -1315,6 +1326,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
/* note: udhcp_sp_read checks FD_ISSET before reading */
switch (udhcp_sp_read(&rfds)) {
case SIGUSR1:
client_config.first_secs = 0; /* make secs field count from 0 */
perform_renew();
if (state == RENEW_REQUESTED)
goto case_RENEW_REQUESTED;
@ -1446,6 +1458,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
udhcp_run_script(NULL, "deconfig");
change_listen_mode(LISTEN_RAW);
state = INIT_SELECTING;
client_config.first_secs = 0; /* make secs field count from 0 */
requested_ip = 0;
timeout = tryagain_timeout;
packet_num = 0;
@ -1493,6 +1506,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
change_listen_mode(LISTEN_RAW);
sleep(3); /* avoid excessive network traffic */
state = INIT_SELECTING;
client_config.first_secs = 0; /* make secs field count from 0 */
requested_ip = 0;
timeout = 0;
packet_num = 0;

3
networking/udhcp/dhcpc.h
View File

@ -21,6 +21,9 @@ struct client_config_t {
uint8_t *vendorclass; /* Optional vendor class-id to use */
uint8_t *hostname; /* Optional hostname to use */
uint8_t *fqdn; /* Optional fully qualified domain name to use */
uint16_t first_secs;
uint16_t last_secs;
} FIX_ALIASING;
/* server_config sits in 1st half of bb_common_bufsiz1 */