diff options
| -rw-r--r-- | networking/udhcp/dhcpc.c | 41 |
1 files changed, 19 insertions, 22 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index eeef435..7138389 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -143,10 +143,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) uint32_t xid = 0; uint32_t lease_seconds = 0; /* can be given as 32-bit quantity */ int packet_num; - /* t1, t2... what a wonderful names... */ - unsigned t1 = t1; /* for gcc */ - unsigned t2 = t2; - unsigned timestamp_got_lease = timestamp_got_lease; + unsigned already_waited_sec; unsigned opt; int max_fd; int retval; @@ -337,6 +334,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) udhcp_run_script(NULL, "deconfig"); change_listen_mode(LISTEN_RAW); packet_num = 0; + already_waited_sec = 0; /* Main event loop. select() waits on signal pipe and possibly * on sockfd. @@ -353,7 +351,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) } max_fd = udhcp_sp_fd_set(&rfds, sockfd); - tv.tv_sec = timeout; + 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) { @@ -373,6 +371,9 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) * resend discover/renew/whatever */ if (retval == 0) { + /* We will restart wait afresh in any case */ + already_waited_sec = 0; + switch (state) { case INIT_SELECTING: if (packet_num < discover_retries) { @@ -420,33 +421,29 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) packet_num = 0; continue; case BOUND: - /* Lease is starting to run out, time to enter renewing state */ + /* Half of the lease passed, time to enter renewing state */ change_listen_mode(LISTEN_KERNEL); DEBUG("Entering renew state"); state = RENEWING; /* fall right through */ case RENEWING: - /* Either set a new T1, or enter REBINDING state */ - if ((t2 - t1) > (lease_seconds / (4*60*60) + 1)) { + if (timeout > 60) { /* send a request packet */ send_renew(xid, server_addr, requested_ip); /* unicast */ - t1 += (t2 - t1) / 2; - timeout = t1 - ((unsigned)monotonic_sec() - timestamp_got_lease); + timeout >>= 1; continue; } /* Timed out, enter rebinding state */ DEBUG("Entering rebinding state"); state = REBINDING; - timeout = (t2 - t1); continue; case REBINDING: /* Lease is *really* about to run out, * try to find DHCP server using broadcast */ - if ((lease_seconds - t2) > (lease_seconds / (4*60*60) + 1)) { + if (timeout > 0) { /* send a request packet */ send_renew(xid, 0, requested_ip); /* broadcast */ - t2 += (lease_seconds - t2) / 2; - timeout = t2 - ((unsigned)monotonic_sec() - timestamp_got_lease); + timeout >>= 1; continue; } /* Timed out, enter init state */ @@ -454,7 +451,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) udhcp_run_script(NULL, "deconfig"); change_listen_mode(LISTEN_RAW); state = INIT_SELECTING; - timeout = 0; + /*timeout = 0; - already is */ packet_num = 0; continue; /* case RELEASED: */ @@ -477,7 +474,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) /* If this packet will turn out to be unrelated/bogus, * we will go back and wait for next one. * Be sure timeout is properly decreased. */ - timeout -= (unsigned)monotonic_sec() - timestamp_before_wait; + already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait; if (len == -1) { /* error is severe, reopen socket */ DEBUG("error on read, %s, reopening socket", strerror(errno)); @@ -523,6 +520,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) state = REQUESTING; timeout = 0; packet_num = 0; + already_waited_sec = 0; } continue; case RENEW_REQUESTED: @@ -538,6 +536,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) /* can be misaligned, thus memcpy */ memcpy(&lease_seconds, temp, 4); lease_seconds = ntohl(lease_seconds); + lease_seconds &= 0x0fffffff; /* paranoia: must not be negative */ } #if ENABLE_FEATURE_UDHCPC_ARPING if (opt & OPT_a) { @@ -557,20 +556,16 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) requested_ip = 0; timeout = tryagain_timeout; packet_num = 0; + already_waited_sec = 0; continue; /* back to main loop */ } } #endif /* enter bound state */ - t1 = lease_seconds / 2; - - /* little fixed point for n * .875 */ - t2 = (lease_seconds * 7) >> 3; + timeout = lease_seconds / 2; temp_addr.s_addr = packet.yiaddr; bb_info_msg("Lease of %s obtained, lease time %u", inet_ntoa(temp_addr), (unsigned)lease_seconds); - timestamp_got_lease = monotonic_sec(); - timeout = t1; requested_ip = packet.yiaddr; udhcp_run_script(&packet, ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); @@ -585,6 +580,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) if (!client_config.foreground) client_background(); + already_waited_sec = 0; continue; /* back to main loop */ } if (*message == DHCPNAK) { @@ -599,6 +595,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv) requested_ip = 0; timeout = 0; packet_num = 0; + already_waited_sec = 0; } continue; /* case BOUND, RELEASED: - ignore all packets */ |