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udhcpc: simplify manual renew (make it more similar to automatic one)

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function                                             old     new   delta
udhcp_run_script                                     669     673      +4
udhcpc_main                                         2414    2401     -13
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 4/-13)              Total: -9 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-07-19 04:07:21 +02:00
parent 252ccba948
commit 13ca4b12e2
1 changed files with 38 additions and 37 deletions
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75
networking/udhcp/dhcpc.c
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@ -7,9 +7,7 @@
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include <syslog.h>
/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
#define WANT_PIDFILE 1
#include "common.h"
@ -25,14 +23,20 @@ static int sockfd = -1;
#define LISTEN_RAW 2
static smallint listen_mode;
/* initial state: (re)start DHCP negotiation */
#define INIT_SELECTING 0
/* discover was sent, DHCPOFFER reply received */
#define REQUESTING 1
/* select/renew was sent, DHCPACK reply received */
#define BOUND 2
/* half of lease passed, want renew it by sending unicast renew requests */
#define RENEWING 3
/* renew requests were not answered, lease is almost over, send broadcast renew */
#define REBINDING 4
#define INIT_REBOOT 5
#define RENEW_REQUESTED 6
#define RELEASED 7
/* manually requested renew (SIGUSR1) */
#define RENEW_REQUESTED 5
/* release, possibly manually requested (SIGUSR2) */
#define RELEASED 6
static smallint state;
/* struct client_config_t client_config is in bb_common_bufsiz1 */
@ -42,7 +46,10 @@ static smallint state;
static void change_listen_mode(int new_mode)
{
log1("Entering listen mode: %s",
new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
new_mode != LISTEN_NONE
? (new_mode == LISTEN_KERNEL ? "kernel" : "raw")
: "none"
);
listen_mode = new_mode;
if (sockfd >= 0) {
@ -349,14 +356,16 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
tv.tv_sec = timeout - already_waited_sec;
tv.tv_usec = 0;
retval = 0; /* If we already timed out, fall through, else... */
if (tv.tv_sec > 0) {
if ((int)tv.tv_sec > 0) {
timestamp_before_wait = (unsigned)monotonic_sec();
log1("Waiting on select...");
retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
if (retval < 0) {
/* EINTR? A signal was caught, don't panic */
if (errno == EINTR)
if (errno == EINTR) {
already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait;
continue;
}
/* Else: an error occured, panic! */
bb_perror_msg_and_die("select");
}
@ -374,9 +383,8 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
if (packet_num < discover_retries) {
if (packet_num == 0)
xid = random_xid();
send_discover(xid, requested_ip); /* broadcast */
/* broadcast */
send_discover(xid, requested_ip);
timeout = discover_timeout;
packet_num++;
continue;
@ -400,44 +408,33 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
timeout = tryagain_timeout;
packet_num = 0;
continue;
case RENEW_REQUESTED:
case REQUESTING:
if (packet_num < discover_retries) {
/* send request packet */
if (state == RENEW_REQUESTED) /* unicast */
send_renew(xid, server_addr, requested_ip);
else /* broadcast */
send_select(xid, server_addr, requested_ip);
/* send broadcast select packet */
send_select(xid, server_addr, requested_ip);
timeout = discover_timeout;
packet_num++;
continue;
}
/* timed out, go back to init state */
if (state == RENEW_REQUESTED)
udhcp_run_script(NULL, "deconfig");
change_listen_mode(LISTEN_RAW);
/* "discover...select...discover..." loops
/* Timed out, go back to init state.
* "discover...select...discover..." loops
* were seen in the wild. Treat them similarly
* to "no response to discover" case */
if (state == REQUESTING) {
state = INIT_SELECTING;
goto leasefail;
}
change_listen_mode(LISTEN_RAW);
state = INIT_SELECTING;
timeout = 0;
packet_num = 0;
continue;
goto leasefail;
case BOUND:
/* Half of the lease passed, time to enter renewing state */
state = RENEWING;
change_listen_mode(LISTEN_KERNEL);
log1("Entering renew state");
state = RENEWING;
/* fall right through */
case RENEW_REQUESTED: /* manual (SIGUSR1) renew */
case_RENEW_REQUESTED:
case RENEWING:
if (timeout > 60) {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
/* send an unicast renew request packet */
send_renew(xid, server_addr, requested_ip);
timeout >>= 1;
continue;
}
@ -449,8 +446,8 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
/* Lease is *really* about to run out,
* try to find DHCP server using broadcast */
if (timeout > 0) {
/* send a request packet */
send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); /* broadcast */
/* send a broadcast renew request packet */
send_renew(xid, 0 /*INADDR_ANY*/, requested_ip);
timeout >>= 1;
continue;
}
@ -476,6 +473,8 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
switch (udhcp_sp_read(&rfds)) {
case SIGUSR1:
perform_renew();
if (state == RENEW_REQUESTED)
goto case_RENEW_REQUESTED;
/* Start things over */
packet_num = 0;
/* Kill any timeouts because the user wants this to hurry along */
@ -562,9 +561,9 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
already_waited_sec = 0;
}
continue;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case RENEW_REQUESTED:
case REBINDING:
if (*message == DHCPACK) {
temp = get_option(&packet, DHCP_LEASE_TIME);
@ -622,7 +621,9 @@ 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 <= RENEW_REQUESTED)
? "renew" : "bound")
);
state = BOUND;
change_listen_mode(LISTEN_NONE);