{
DEBUG("entering %s listen mode",
new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
+
+ listen_mode = new_mode;
if (sockfd >= 0) {
close(sockfd);
sockfd = -1;
}
- listen_mode = new_mode;
+ if (new_mode == LISTEN_KERNEL)
+ sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
+ else if (new_mode != LISTEN_NONE)
+ sockfd = udhcp_raw_socket(client_config.ifindex);
+ /* else LISTEN_NONE: sockfd stay closed */
}
/* on NOMMU reexec (i.e., background) early */
if (!(opt & OPT_f)) {
bb_daemonize_or_rexec(0 /* flags */, argv);
- logmode = 0;
+ logmode = LOGMODE_NONE;
}
#endif
if (opt & OPT_S) {
- openlog(applet_name, LOG_PID, LOG_LOCAL0);
+ openlog(applet_name, LOG_PID, LOG_DAEMON);
logmode |= LOGMODE_SYSLOG;
}
* "continue" statements in code below jump to the top of the loop.
*/
for (;;) {
- unsigned timestamp_before_wait;
+ /* silence "uninitialized!" warning */
+ unsigned timestamp_before_wait = timestamp_before_wait;
+
+ //bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode);
+
+ /* Was opening raw or udp socket here
+ * if (listen_mode != LISTEN_NONE && sockfd < 0),
+ * but on fast network renew responses return faster
+ * than we open sockets. Thus this code is moved
+ * to change_listen_mode(). Thus we open listen socket
+ * BEFORE we send renew request (see "case BOUND:"). */
- if (listen_mode != LISTEN_NONE && sockfd < 0) {
- if (listen_mode == LISTEN_KERNEL)
- sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
- else
- sockfd = udhcp_raw_socket(client_config.ifindex);
- }
max_fd = udhcp_sp_fd_set(&rfds, sockfd);
tv.tv_sec = timeout - already_waited_sec;
if (state == RENEW_REQUESTED)
udhcp_run_script(NULL, "deconfig");
change_listen_mode(LISTEN_RAW);
- state = INIT_SELECTING;
/* "discover...select...discover..." loops
- * were seen in the wild. Treat then similarly
+ * were seen in the wild. Treat them similarly
* to "no response to discover" case */
- if (state == REQUESTING)
+ if (state == REQUESTING) {
+ state = INIT_SELECTING;
goto leasefail;
+ }
+ state = INIT_SELECTING;
timeout = 0;
packet_num = 0;
continue;
* try to find DHCP server using broadcast */
if (timeout > 0) {
/* send a request packet */
- send_renew(xid, 0 /* INADDR_ANY*/, requested_ip); /* broadcast */
+ send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); /* broadcast */
timeout >>= 1;
continue;
}
}
/* 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 */
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;
}
/* still selecting - this server looks bad */
}
/* it IS unaligned sometimes, don't "optimize" */
- server_addr = get_unaligned_u32p((uint32_t*)temp);
+ move_from_unaligned32(server_addr, temp);
xid = packet.xid;
requested_ip = packet.yiaddr;
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" */
+ move_from_unaligned32(lease_seconds, 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,
) {
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)
}
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);
projects / oweals / busybox.git / blobdiff