libbb: make bb_common_bufsiz1 1 kbyte, add capability to use bss tail for it

The config item is FEATURE_USE_BSS_TAIL. When it is off (default):

function                                             old     new   delta
read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
push                                                  46      44      -2
inetd_main                                          2136    2134      -2
uevent_main                                          421     418      -3
addLines                                              97      92      -5
bb_common_bufsiz1                                   8193    1024   -7169
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 8/5 up/down: 62/-7181)        Total: -7119 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829901	   4086	   1904	 835891	  cc133	busybox_unstripped

FEATURE_USE_BSS_TAIL=y:

read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
inetd_main                                          2136    2134      -2
bb_common_bufsiz1                                   8193       -   -8193
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 8/1 up/down: 62/-8195)        Total: -8133 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829911	   4086	    880	 834877	  cbd3d	busybox_unstripped

FIXME: setup_common_bufsiz() calls are missing.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

24 files changed, 76 insertions, 50 deletions

diff --git a/networking/arp.c b/networking/arp.c
index 0099aa5..5f78186 100644
--- a/networking/arp.c
+++ b/networking/arp.c
@@ -32,6 +32,7 @@
 //usage:       "\n	-H HWTYPE	Hardware address type"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "inet_common.h"
 
 #include <arpa/inet.h>
@@ -69,7 +70,7 @@ struct globals {
 	const char *device;      /* current device */
 	smallint hw_set;         /* flag if hw-type was set (-H) */
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define ap         (G.ap        )
 #define hw         (G.hw        )
 #define device     (G.device    )
diff --git a/networking/arping.c b/networking/arping.c
index ef205e5..52f5ba5 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -28,6 +28,7 @@
 #include <netpacket/packet.h>
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 /* We don't expect to see 1000+ seconds delay, unsigned is enough */
 #define MONOTONIC_US() ((unsigned)monotonic_us())
@@ -60,7 +61,7 @@ struct globals {
 	unsigned brd_recv;
 	unsigned req_recv;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define src        (G.src       )
 #define dst        (G.dst       )
 #define me         (G.me        )
diff --git a/networking/ftpd.c b/networking/ftpd.c
index 8345ae6..8553a28 100644
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -29,6 +29,7 @@
 //usage:     "\n	DIR	Change root to this directory"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <syslog.h>
 #include <netinet/tcp.h>
 
@@ -123,7 +124,7 @@ struct globals {
 	char msg_ok [(sizeof("NNN " MSG_OK ) + 3) & 0xfffc];
 	char msg_err[(sizeof("NNN " MSG_ERR) + 3) & 0xfffc];
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	/* Moved to main */ \
 	/*strcpy(G.msg_ok  + 4, MSG_OK );*/ \
diff --git a/networking/ftpgetput.c b/networking/ftpgetput.c
index b398bc8..61bc45c 100644
--- a/networking/ftpgetput.c
+++ b/networking/ftpgetput.c
@@ -50,6 +50,7 @@
 //usage:	)
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 struct globals {
 	const char *user;
@@ -60,7 +61,7 @@ struct globals {
 	int do_continue;
 	char buf[4]; /* actually [BUFSZ] */
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
 #define user           (G.user          )
 #define password       (G.password      )
diff --git a/networking/httpd.c b/networking/httpd.c
index ed15fd8..ef90770 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -125,6 +125,7 @@
 //usage:     "\n	-d STRING	URL decode STRING"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #if ENABLE_PAM
 /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
 # undef setlocale
@@ -307,7 +308,8 @@ struct globals {
 	Htaccess *script_i;     /* config script interpreters */
 #endif
 	char *iobuf;            /* [IOBUF_SIZE] */
-#define hdr_buf bb_common_bufsiz1
+#define        hdr_buf bb_common_bufsiz1
+#define sizeof_hdr_buf COMMON_BUFSIZE
 	char *hdr_ptr;
 	int hdr_cnt;
 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
@@ -1066,7 +1068,7 @@ static int get_line(void)
 	alarm(HEADER_READ_TIMEOUT);
 	while (1) {
 		if (hdr_cnt <= 0) {
-			hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
+			hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
 			if (hdr_cnt <= 0)
 				break;
 			hdr_ptr = hdr_buf;
@@ -1191,9 +1193,9 @@ static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post
 			/* We expect data, prev data portion is eaten by CGI
 			 * and there *is* data to read from the peer
 			 * (POSTDATA) */
-			//count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
+			//count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len;
 			//count = safe_read(STDIN_FILENO, hdr_buf, count);
-			count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
+			count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
 			if (count > 0) {
 				hdr_cnt = count;
 				hdr_ptr = hdr_buf;
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 2c6db92..399ff6b 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -44,6 +44,7 @@
 //usage:     "\n	-f	Force de/configuration"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 /* After libbb.h, since it needs sys/types.h on some systems */
 #include <sys/utsname.h>
 #include <fnmatch.h>
@@ -129,7 +130,7 @@ struct globals {
 	const char *startup_PATH;
 	char *shell;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 
diff --git a/networking/inetd.c b/networking/inetd.c
index 4f6673b..aa35ffa 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -170,6 +170,7 @@
 #include <sys/un.h>
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #if ENABLE_FEATURE_INETD_RPC
 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
@@ -327,7 +328,7 @@ struct globals {
 	/* Used in next_line(), and as scratch read buffer */
 	char line[256];          /* _at least_ 256, see LINE_SIZE */
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
 #define rlim_ofile_cur  (G.rlim_ofile_cur )
 #define rlim_ofile      (G.rlim_ofile     )
diff --git a/networking/isrv_identd.c b/networking/isrv_identd.c
index 252c8ab..f63ed8e 100644
--- a/networking/isrv_identd.c
+++ b/networking/isrv_identd.c
@@ -18,6 +18,7 @@
 //usage:     "\n	STRING	Ident answer string (default: nobody)"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <syslog.h>
 #include "isrv.h"
 
@@ -28,7 +29,8 @@ typedef struct identd_buf_t {
 	char buf[64 - sizeof(int)];
 } identd_buf_t;
 
-#define bogouser bb_common_bufsiz1
+#define        bogouser bb_common_bufsiz1
+#define sizeof_bogouser COMMON_BUFSIZE
 
 static int new_peer(isrv_state_t *state, int fd)
 {
@@ -118,7 +120,7 @@ int fakeidentd_main(int argc UNUSED_PARAM, char **argv)
 	opt = getopt32(argv, "fiwb:", &bind_address);
 	strcpy(bogouser, "nobody");
 	if (argv[optind])
-		strncpy(bogouser, argv[optind], sizeof(bogouser) - 1);
+		strncpy(bogouser, argv[optind], sizeof_bogouser - 1);
 
 	/* Daemonize if no -f and no -i and no -w */
 	if (!(opt & OPT_fiw))
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 5c975d8..2c0f514 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -13,6 +13,7 @@
 #include <net/if_arp.h>
 
 #include "ip_common.h"  /* #include "libbb.h" is inside */
+#include "common_bufsiz.h"
 #include "rt_names.h"
 #include "utils.h"
 
@@ -39,7 +40,7 @@ struct filter_t {
 } FIX_ALIASING;
 typedef struct filter_t filter_t;
 
-#define G_filter (*(filter_t*)&bb_common_bufsiz1)
+#define G_filter (*(filter_t*)bb_common_bufsiz1)
 
 
 static void print_link_flags(unsigned flags, unsigned mdown)
diff --git a/networking/libiproute/ipneigh.c b/networking/libiproute/ipneigh.c
index 179505c..151d3d1 100644
--- a/networking/libiproute/ipneigh.c
+++ b/networking/libiproute/ipneigh.c
@@ -8,6 +8,7 @@
  */
 
 #include "ip_common.h"  /* #include "libbb.h" is inside */
+#include "common_bufsiz.h"
 #include "rt_names.h"
 #include "utils.h"
 #include <linux/neighbour.h>
@@ -40,7 +41,7 @@ struct filter_t {
 } FIX_ALIASING;
 typedef struct filter_t filter_t;
 
-#define G_filter (*(filter_t*)&bb_common_bufsiz1)
+#define G_filter (*(filter_t*)bb_common_bufsiz1)
 
 static int flush_update(void)
 {
diff --git a/networking/libiproute/iproute.c b/networking/libiproute/iproute.c
index 8282748..34d4f47 100644
--- a/networking/libiproute/iproute.c
+++ b/networking/libiproute/iproute.c
@@ -11,6 +11,7 @@
  */
 
 #include "ip_common.h"  /* #include "libbb.h" is inside */
+#include "common_bufsiz.h"
 #include "rt_names.h"
 #include "utils.h"
 
@@ -43,7 +44,7 @@ struct filter_t {
 } FIX_ALIASING;
 typedef struct filter_t filter_t;
 
-#define G_filter (*(filter_t*)&bb_common_bufsiz1)
+#define G_filter (*(filter_t*)bb_common_bufsiz1)
 
 static int flush_update(void)
 {
diff --git a/networking/nc.c b/networking/nc.c
index 2f9e174..50edee4 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -8,6 +8,7 @@
  */
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 //config:config NC
 //config:	bool "nc"
@@ -252,7 +253,7 @@ int nc_main(int argc, char **argv)
 		fd = STDIN_FILENO;
 		while (1) {
 			if (FD_ISSET(fd, &testfds)) {
-				nread = safe_read(fd, iobuf, sizeof(iobuf));
+				nread = safe_read(fd, iobuf, COMMON_BUFSIZE);
 				if (fd == cfd) {
 					if (nread < 1)
 						exit(EXIT_SUCCESS);
diff --git a/networking/ping.c b/networking/ping.c
index 0eb1ae7..7616609 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -28,6 +28,7 @@
 #include <net/if.h>
 #include <netinet/ip_icmp.h>
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #ifdef __BIONIC__
 /* should be in netinet/ip_icmp.h */
@@ -186,7 +187,7 @@ struct globals {
 	char *hostname;
 	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 static void noresp(int ign UNUSED_PARAM)
@@ -378,7 +379,7 @@ struct globals {
 	} pingaddr;
 	unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define if_index     (G.if_index    )
 #define source_lsa   (G.source_lsa  )
 #define str_I        (G.str_I       )
diff --git a/networking/slattach.c b/networking/slattach.c
index 14e0c19..d9d8fe7 100644
--- a/networking/slattach.c
+++ b/networking/slattach.c
@@ -27,6 +27,7 @@
 //usage:     "\n	-F	Disable RTS/CTS flow control"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "libiproute/utils.h" /* invarg_1_to_2() */
 
 struct globals {
@@ -34,7 +35,7 @@ struct globals {
 	int saved_disc;
 	struct termios saved_state;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define handle       (G.handle      )
 #define saved_disc   (G.saved_disc  )
 #define saved_state  (G.saved_state )
diff --git a/networking/tc.c b/networking/tc.c
index c84c18a..1372ca0 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -29,6 +29,7 @@
 //usage:	"filter show [ dev STRING ] [ root | parent CLASSID ]"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #include "libiproute/utils.h"
 #include "libiproute/ip_common.h"
@@ -63,7 +64,7 @@ struct globals {
 	uint32_t filter_prio;
 	uint32_t filter_proto;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define filter_ifindex (G.filter_ifindex)
 #define filter_qdisc (G.filter_qdisc)
 #define filter_parent (G.filter_parent)
diff --git a/networking/tcpudp.c b/networking/tcpudp.c
index 3df6a98..6249730 100644
--- a/networking/tcpudp.c
+++ b/networking/tcpudp.c
@@ -67,6 +67,7 @@
 //usage:     "\n	-v		Verbose"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 /* Wants <limits.h> etc, thus included after libbb.h: */
 #ifdef __linux__
@@ -91,7 +92,7 @@ struct globals {
 	char **env_cur;
 	char *env_var[1]; /* actually bigger */
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define verbose      (G.verbose     )
 #define max_per_host (G.max_per_host)
 #define cur_per_host (G.cur_per_host)
diff --git a/networking/telnet.c b/networking/telnet.c
index 944cf1b..2946bc8 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -39,6 +39,7 @@
 #include <arpa/telnet.h>
 #include <netinet/in.h>
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #ifdef __BIONIC__
 /* should be in arpa/telnet.h */
@@ -108,7 +109,7 @@ struct globals {
 	struct termios termios_def;
 	struct termios termios_raw;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 } while (0)
diff --git a/networking/telnetd.c b/networking/telnetd.c
index 25d05fe..13d5a8f 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -44,6 +44,7 @@
 #define DEBUG 0
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <syslog.h>
 
 #if DEBUG
@@ -82,7 +83,7 @@ struct globals {
 	const char *issuefile;
 	int maxfd;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	G.loginpath = "/bin/login"; \
 	G.issuefile = "/etc/issue.net"; \
diff --git a/networking/tftp.c b/networking/tftp.c
index ad9308e..8aeb79a 100644
--- a/networking/tftp.c
+++ b/networking/tftp.c
@@ -51,6 +51,7 @@
 //usage:     "\n	-l	Log to syslog (inetd mode requires this)"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <syslog.h>
 
 #if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
@@ -128,7 +129,7 @@ struct globals {
 	bb_progress_t pmt;
 #endif
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 } while (0)
@@ -757,7 +758,8 @@ int tftpd_main(int argc UNUSED_PARAM, char **argv)
 {
 	len_and_sockaddr *our_lsa;
 	len_and_sockaddr *peer_lsa;
-	char *local_file, *mode, *user_opt;
+	char *mode, *user_opt;
+	char *local_file = local_file;
 	const char *error_msg;
 	int opt, result, opcode;
 	IF_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;)
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 496ab11..a526494 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -9,6 +9,7 @@
 #define UDHCP_COMMON_H 1
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <netinet/udp.h>
 #include <netinet/ip.h>
 
diff --git a/networking/udhcp/dhcpd.h b/networking/udhcp/dhcpd.h
index 183e7e2..9dd5bef 100644
--- a/networking/udhcp/dhcpd.h
+++ b/networking/udhcp/dhcpd.h
@@ -57,7 +57,7 @@ struct server_config_t {
 	struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
 } FIX_ALIASING;
 
-#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
+#define server_config (*(struct server_config_t*)bb_common_bufsiz1)
 /* client_config sits in 2nd half of bb_common_bufsiz1 */
 
 #if ENABLE_FEATURE_UDHCP_PORT
diff --git a/networking/udhcp/dhcprelay.c b/networking/udhcp/dhcprelay.c
index f82ac05..1722a85 100644
--- a/networking/udhcp/dhcprelay.c
+++ b/networking/udhcp/dhcprelay.c
@@ -33,7 +33,7 @@ struct xid_item {
 	struct xid_item *next;
 } FIX_ALIASING;
 
-#define dhcprelay_xid_list (*(struct xid_item*)&bb_common_bufsiz1)
+#define dhcprelay_xid_list (*(struct xid_item*)bb_common_bufsiz1)
 
 static struct xid_item *xid_add(uint32_t xid, struct sockaddr_in *ip, int client)
 {
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 7b57c62..b224253 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -57,33 +57,35 @@ static int FAST_FUNC read_staticlease(const char *const_line, void *arg)
 struct config_keyword {
 	const char *keyword;
 	int (*handler)(const char *line, void *var) FAST_FUNC;
-	void *var;
+	unsigned ofs;
 	const char *def;
 };
 
+#define OFS(field) offsetof(struct server_config_t, field)
+
 static const struct config_keyword keywords[] = {
 	/* keyword        handler           variable address               default */
-	{"start"        , udhcp_str2nip   , &server_config.start_ip     , "192.168.0.20"},
-	{"end"          , udhcp_str2nip   , &server_config.end_ip       , "192.168.0.254"},
-	{"interface"    , read_str        , &server_config.interface    , "eth0"},
+	{"start"        , udhcp_str2nip   , OFS(start_ip     ), "192.168.0.20"},
+	{"end"          , udhcp_str2nip   , OFS(end_ip       ), "192.168.0.254"},
+	{"interface"    , read_str        , OFS(interface    ), "eth0"},
 	/* Avoid "max_leases value not sane" warning by setting default
 	 * to default_end_ip - default_start_ip + 1: */
-	{"max_leases"   , read_u32        , &server_config.max_leases   , "235"},
-	{"auto_time"    , read_u32        , &server_config.auto_time    , "7200"},
-	{"decline_time" , read_u32        , &server_config.decline_time , "3600"},
-	{"conflict_time", read_u32        , &server_config.conflict_time, "3600"},
-	{"offer_time"   , read_u32        , &server_config.offer_time   , "60"},
-	{"min_lease"    , read_u32        , &server_config.min_lease_sec, "60"},
-	{"lease_file"   , read_str        , &server_config.lease_file   , LEASES_FILE},
-	{"pidfile"      , read_str        , &server_config.pidfile      , "/var/run/udhcpd.pid"},
-	{"siaddr"       , udhcp_str2nip   , &server_config.siaddr_nip   , "0.0.0.0"},
+	{"max_leases"   , read_u32        , OFS(max_leases   ), "235"},
+	{"auto_time"    , read_u32        , OFS(auto_time    ), "7200"},
+	{"decline_time" , read_u32        , OFS(decline_time ), "3600"},
+	{"conflict_time", read_u32        , OFS(conflict_time), "3600"},
+	{"offer_time"   , read_u32        , OFS(offer_time   ), "60"},
+	{"min_lease"    , read_u32        , OFS(min_lease_sec), "60"},
+	{"lease_file"   , read_str        , OFS(lease_file   ), LEASES_FILE},
+	{"pidfile"      , read_str        , OFS(pidfile      ), "/var/run/udhcpd.pid"},
+	{"siaddr"       , udhcp_str2nip   , OFS(siaddr_nip   ), "0.0.0.0"},
 	/* keywords with no defaults must be last! */
-	{"option"       , udhcp_str2optset, &server_config.options      , ""},
-	{"opt"          , udhcp_str2optset, &server_config.options      , ""},
-	{"notify_file"  , read_str        , &server_config.notify_file  , NULL},
-	{"sname"        , read_str        , &server_config.sname        , NULL},
-	{"boot_file"    , read_str        , &server_config.boot_file    , NULL},
-	{"static_lease" , read_staticlease, &server_config.static_leases, ""},
+	{"option"       , udhcp_str2optset, OFS(options      ), ""},
+	{"opt"          , udhcp_str2optset, OFS(options      ), ""},
+	{"notify_file"  , read_str        , OFS(notify_file  ), NULL},
+	{"sname"        , read_str        , OFS(sname        ), NULL},
+	{"boot_file"    , read_str        , OFS(boot_file    ), NULL},
+	{"static_lease" , read_staticlease, OFS(static_leases), ""},
 };
 enum { KWS_WITH_DEFAULTS = ARRAY_SIZE(keywords) - 6 };
 
@@ -95,17 +97,17 @@ void FAST_FUNC read_config(const char *file)
 	char *token[2];
 
 	for (i = 0; i < KWS_WITH_DEFAULTS; i++)
-		keywords[i].handler(keywords[i].def, keywords[i].var);
+		keywords[i].handler(keywords[i].def, (char*)&server_config + keywords[i].ofs);
 
 	parser = config_open(file);
 	while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) {
 		for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) {
 			if (strcasecmp(token[0], k->keyword) == 0) {
-				if (!k->handler(token[1], k->var)) {
+				if (!k->handler(token[1], (char*)&server_config + k->ofs)) {
 					bb_error_msg("can't parse line %u in %s",
 							parser->lineno, file);
 					/* reset back to the default value */
-					k->handler(k->def, k->var);
+					k->handler(k->def, (char*)&server_config + k->ofs);
 				}
 				break;
 			}
diff --git a/networking/zcip.c b/networking/zcip.c
index c930826..7964345 100644
--- a/networking/zcip.c
+++ b/networking/zcip.c
@@ -40,6 +40,7 @@
 //usage:     "\nexits only on I/O errors (link down etc)"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <netinet/ether.h>
 #include <net/if.h>
 #include <net/if_arp.h>
@@ -90,7 +91,7 @@ struct globals {
 	struct ether_addr our_ethaddr;
 	uint32_t localnet_ip;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)