Add support for writing lease files.

ndhc.sh

@@ -14,6 +14,7 @@ ndhc_start()
 {
 	local args= opt= opts= pidfile="/var/run/ndhc-${IFACE}.pid"
 	local sendhost=true
+	local leasefile="/var/state/${IFACE}.lease"
 
 	eval args=\$ndhc_${IFVAR}
 
@@ -63,7 +64,7 @@ ndhc_start()
 
 	eval "${x}" "${args}" -r `cat /etc/firewall/tmp/OLDEXTIP` \
 		-n -i "${IFACE}" -u "ndhc" -C "/var/lib/ndhc" \
-		-p "${pidfile}" >/dev/null
+		-p "${pidfile}" -l "${leasefile}" >/dev/null
 	eend $? || return 1
 
 	_show_address

ndhc/CMakeLists.txt

@@ -2,18 +2,7 @@ project (ndhc)
 
 cmake_minimum_required (VERSION 2.6)
 
-set(NDHC_SRCS
-  sys.c
-  options.c
-  socket.c
-  packet.c
-  timeout.c
-  ifchange.c
-  dhcpmsg.c
-  arp.c
-  netlink.c
-  ndhc.c
-  )
+file(GLOB NDHC_SRCS "*.c")
 
 add_executable(ndhc ${NDHC_SRCS})
 target_link_libraries(ndhc ncmlib)

ndhc/arp.c

@@ -1,5 +1,5 @@
 /* arp.c - arp ping checking
- * Time-stamp: <2011-03-31 02:29:09 nk>
+ * Time-stamp: <2011-04-19 16:21:14 njk>
  *
  * Copyright 2010-2011 Nicholas J. Kain <njkain@gmail.com>
  *
@@ -37,6 +37,7 @@
 #include "socket.h"
 #include "sys.h"
 #include "ifchange.h"
+#include "leasefile.h"
 #include "log.h"
 #include "strl.h"
 #include "io.h"
@@ -209,6 +210,7 @@ void arp_success(struct client_state_t *cs)
                cs->arpPrevState == DS_REBINDING)
               ? IFCHANGE_RENEW : IFCHANGE_BOUND));
     change_listen_mode(cs, LM_NONE);
+    write_leasefile(temp_addr);
     if (client_config.quit_after_lease)
         exit(EXIT_SUCCESS);
     if (!client_config.foreground)

ndhc/leasefile.c

@@ -0,0 +1,76 @@
+/* leasefile.c - functions for writing the lease file
+ * Time-stamp: <2011-04-19 16:22:36 njk>
+ *
+ * (c) 2011 Nicholas J. Kain <njkain at gmail dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <limits.h>
+#include "log.h"
+#include "strl.h"
+#include "io.h"
+#include "defines.h"
+
+static char leasefile[PATH_MAX] = "\0";
+static int leasefilefd = -1;
+
+void set_leasefile(char *lf)
+{
+    strlcpy(leasefile, lf, sizeof leasefile);
+}
+
+void open_leasefile()
+{
+    if (strlen(leasefile) > 0) {
+        leasefilefd = open(leasefile, O_WRONLY|O_TRUNC|O_CREAT, 0644);
+        if (leasefilefd < 0) {
+            log_line("Failed to create lease file (%s)\n", leasefile);
+            exit(EXIT_FAILURE);
+        }
+    }
+}
+
+void write_leasefile(struct in_addr ipnum)
+{
+    char ip[INET_ADDRSTRLEN+2];
+    int ret;
+    if (leasefilefd < 0)
+        return;
+    inet_ntop(AF_INET, &ipnum, ip, sizeof ip);
+    strlcat(ip, "\n", sizeof ip);
+  retry_trunc:
+    ret = ftruncate(leasefilefd, 0);
+    switch (ret) {
+        default: break;
+        case -1:
+            if (errno == EINTR)
+                goto retry_trunc;
+            log_warning("Failed to truncate lease file.\n");
+            return;
+    }
+    ret = safe_write(leasefilefd, ip, strlen(ip));
+    if (ret == -1)
+        log_warning("Failed to write ip to lease file.\n");
+}

ndhc/leasefile.h

@@ -0,0 +1,23 @@
+/* leasefile.h - functions for writing the lease file
+ * Time-stamp: <2011-04-19 16:22:47 njk>
+ *
+ * (c) 2011 Nicholas J. Kain <njkain at gmail dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+void set_leasefile(char *lf);
+void open_leasefile();
+void write_leasefile(struct in_addr ipnum);

ndhc/ndhc.c

@@ -1,5 +1,5 @@
 /* ndhc.c - DHCP client
- * Time-stamp: <2011-03-31 01:38:17 nk>
+ * Time-stamp: <2011-04-19 16:04:53 njk>
  *
  * (c) 2004-2011 Nicholas J. Kain <njkain at gmail dot com>
  *
@@ -49,6 +49,7 @@
 #include "socket.h"
 #include "arp.h"
 #include "netlink.h"
+#include "leasefile.h"
 
 #include "log.h"
 #include "chroot.h"
@@ -274,6 +275,7 @@ int main(int argc, char **argv)
         {"foreground",  no_argument,        0, 'f'},
         {"background",  no_argument,        0, 'b'},
         {"pidfile",     required_argument,  0, 'p'},
+        {"leasefile",   required_argument,  0, 'l'},
         {"hostname",    required_argument,  0, 'H'},
         {"hostname",    required_argument,      0, 'h'},
         {"interface",   required_argument,  0, 'i'},
@@ -290,7 +292,7 @@ int main(int argc, char **argv)
     /* get options */
     while (1) {
         int option_index = 0;
-        c = getopt_long(argc, argv, "c:fbp:H:h:i:np:qr:u:C:v", arg_options,
+        c = getopt_long(argc, argv, "c:fbp:H:h:i:np:l:qr:u:C:v", arg_options,
                         &option_index);
         if (c == -1) break;
 
@@ -313,6 +315,9 @@ int main(int argc, char **argv)
             case 'p':
                 strlcpy(pidfile, optarg, sizeof pidfile);
                 break;
+            case 'l':
+                set_leasefile(optarg);
+                break;
             case 'h':
             case 'H':
                 len = strlen(optarg) > 64 ? 64 : strlen(optarg);
@@ -379,6 +384,8 @@ int main(int argc, char **argv)
             alloc_dhcp_client_id_option(1, client_config.arp, 6);
     }
 
+    open_leasefile();
+
     if (chdir(chroot_dir)) {
         printf("Failed to chdir(%s)!\n", chroot_dir);
         exit(EXIT_FAILURE);