Shrink patch from Bernhard Fischer.

1 files changed, 69 insertions, 81 deletions

diff --git a/networking/arping.c b/networking/arping.c
index b30cb53..90a03a5 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -1,10 +1,8 @@
+/* vi:set ts=4:*/
 /*
  * arping.c - Ping hosts by ARP requests/replies
  *
- * 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  *
  * Author:	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  * Busybox port: Nick Fedchik <nick@fedchik.org.ua>
@@ -26,29 +24,32 @@
 
 #include "busybox.h"
 
-#define APPLET_NAME "arping"
-
 static struct in_addr src;
 static struct in_addr dst;
 static struct sockaddr_ll me;
 static struct sockaddr_ll he;
 static struct timeval last;
-static int dad;
-static int unsolicited;
-static int advert;
-static int quiet;
-static int quit_on_reply = 0;
+struct cfg_s {
+	int dad:1;
+	int unsolicited:1;
+	int advert:1;
+	int quiet:1;
+	int quit_on_reply:1;
+	int unicasting:1;
+	int broadcast_only:1;
+};
+static struct cfg_s cfg;
+
+static int s;
 static int count = -1;
 static int timeout;
-static int unicasting;
-static int s;
-static int broadcast_only;
 static int sent;
 static int brd_sent;
 static int received;
 static int brd_recv;
 static int req_recv;
 
+
 #define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
 			   ((tv1).tv_usec-(tv2).tv_usec)/1000 )
 #if 0
@@ -69,7 +70,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
 {
 	int err;
 	struct timeval now;
-	unsigned char buf[256];
+	RESERVE_CONFIG_UBUFFER(buf, 256);
 	struct arphdr *ah = (struct arphdr *) buf;
 	unsigned char *p = (unsigned char *) (ah + 1);
 
@@ -78,7 +79,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
 	ah->ar_pro = htons(ETH_P_IP);
 	ah->ar_hln = ME->sll_halen;
 	ah->ar_pln = 4;
-	ah->ar_op = advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
+	ah->ar_op = cfg.advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
 
 	memcpy(p, &ME->sll_addr, ah->ar_hln);
 	p += ME->sll_halen;
@@ -86,7 +87,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
 	memcpy(p, src_addr, 4);
 	p += 4;
 
-	if (advert)
+	if (cfg.advert)
 		memcpy(p, &ME->sll_addr, ah->ar_hln);
 	else
 		memcpy(p, &HE->sll_addr, ah->ar_hln);
@@ -100,15 +101,16 @@ static int send_pack(int sock, struct in_addr *src_addr,
 	if (err == p - buf) {
 		last = now;
 		sent++;
-		if (!unicasting)
+		if (!cfg.unicasting)
 			brd_sent++;
 	}
+	RELEASE_CONFIG_BUFFER(buf);
 	return err;
 }
 
 static void finish(void)
 {
-	if (!quiet) {
+	if (!cfg.quiet) {
 		printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent);
 		printf("Received %d repl%s", received, (received > 1) ? "ies" : "y");
 		if (brd_recv || req_recv) {
@@ -122,9 +124,9 @@ static void finish(void)
 		putchar('\n');
 		fflush(stdout);
 	}
-	if (dad)
+	if (cfg.dad)
 		exit(!!received);
-	if (unsolicited)
+	if (cfg.unsolicited)
 		exit(0);
 	exit(!received);
 }
@@ -145,7 +147,7 @@ static void catcher(void)
 
 	if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
 		send_pack(s, &src, &dst, &me, &he);
-		if (count == 0 && unsolicited)
+		if (count == 0 && cfg.unsolicited)
 			finish();
 	}
 	alarm(1);
@@ -153,13 +155,10 @@ static void catcher(void)
 
 static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 {
-	struct timeval tv;
 	struct arphdr *ah = (struct arphdr *) buf;
 	unsigned char *p = (unsigned char *) (ah + 1);
 	struct in_addr src_ip, dst_ip;
 
-	gettimeofday(&tv, NULL);
-
 	/* Filter out wild packets */
 	if (FROM->sll_pkttype != PACKET_HOST &&
 		FROM->sll_pkttype != PACKET_BROADCAST &&
@@ -187,7 +186,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 		return 0;
 	memcpy(&src_ip, p + ah->ar_hln, 4);
 	memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
-	if (!dad) {
+	if (!cfg.dad) {
 		if (src_ip.s_addr != dst.s_addr)
 			return 0;
 		if (src.s_addr != dst_ip.s_addr)
@@ -215,8 +214,11 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 		if (src.s_addr && src.s_addr != dst_ip.s_addr)
 			return 0;
 	}
-	if (!quiet) {
+	if (!cfg.quiet) {
 		int s_printed = 0;
+		struct timeval tv;
+
+		gettimeofday(&tv, NULL);
 
 		printf("%s ",
 			   FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast");
@@ -234,6 +236,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 			printf("[%s]",
 				   ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
 		}
+
 		if (last.tv_sec) {
 			long usecs = (tv.tv_sec - last.tv_sec) * 1000000 +
 				tv.tv_usec - last.tv_usec;
@@ -251,48 +254,46 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 		brd_recv++;
 	if (ah->ar_op == htons(ARPOP_REQUEST))
 		req_recv++;
-	if (quit_on_reply)
+	if (cfg.quit_on_reply)
 		finish();
-	if (!broadcast_only) {
+	if (!cfg.broadcast_only) {
 		memcpy(he.sll_addr, p, me.sll_halen);
-		unicasting = 1;
+		cfg.unicasting = 1;
 	}
 	return 1;
 }
 
 int arping_main(int argc, char **argv)
 {
-	int socket_errno;
 	int ch;
-	uid_t uid = getuid();
 	char *device = "eth0";
-	int ifindex = 0;
+	int ifindex;
 	char *source = NULL;
 	char *target;
 
 	s = socket(PF_PACKET, SOCK_DGRAM, 0);
-	socket_errno = errno;
+	ifindex = errno;
 
-	setuid(uid);
+	setuid(getuid());
 
 	while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) {
 		switch (ch) {
 		case 'b':
-			broadcast_only = 1;
+			cfg.broadcast_only = 1;
 			break;
 		case 'D':
-			dad++;
-			quit_on_reply = 1;
+			cfg.dad = 1;
+			cfg.quit_on_reply = 1;
 			break;
 		case 'U':
-			unsolicited++;
+			cfg.unsolicited = 1;
 			break;
 		case 'A':
-			advert++;
-			unsolicited++;
+			cfg.advert = 1;
+			cfg.unsolicited = 1;
 			break;
 		case 'q':
-			quiet++;
+			cfg.quiet = 1;
 			break;
 		case 'c':
 			count = atoi(optarg);
@@ -304,14 +305,13 @@ int arping_main(int argc, char **argv)
 			if (optarg == NULL)
 				bb_show_usage();
 			if (bb_strlen(optarg) > IF_NAMESIZE) {
-				bb_error_msg("Interface name `%s' must be less than %d", optarg,
-						  IF_NAMESIZE);
-				exit(2);
+				bb_error_msg_and_die("Interface name `%s' must be less than %d",
+								optarg, IF_NAMESIZE);
 			}
 			device = optarg;
 			break;
 		case 'f':
-			quit_on_reply = 1;
+			cfg.quit_on_reply = 1;
 			break;
 		case 's':
 			source = optarg;
@@ -329,11 +329,11 @@ int arping_main(int argc, char **argv)
 		bb_show_usage();
 
 	target = *argv;
-
+	bb_default_error_retval = 2;
 
 	if (s < 0) {
-		bb_error_msg("socket");
-		exit(socket_errno);
+		bb_perror_msg("socket");
+		exit(ifindex);
 	}
 
 	{
@@ -342,22 +342,19 @@ int arping_main(int argc, char **argv)
 		memset(&ifr, 0, sizeof(ifr));
 		strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
 		if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
-			bb_error_msg("Interface %s not found", device);
-			exit(2);
+			bb_error_msg_and_die("Interface %s not found", device);
 		}
 		ifindex = ifr.ifr_ifindex;
 
 		if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
-			bb_error_msg("SIOCGIFFLAGS");
-			exit(2);
+			bb_error_msg_and_die("SIOCGIFFLAGS");
 		}
 		if (!(ifr.ifr_flags & IFF_UP)) {
-			bb_error_msg("Interface %s is down", device);
-			exit(2);
+			bb_error_msg_and_die("Interface %s is down", device);
 		}
 		if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
 			bb_error_msg("Interface %s is not ARPable", device);
-			exit(dad ? 0 : 2);
+			exit(cfg.dad ? 0 : 2);
 		}
 	}
 
@@ -366,27 +363,24 @@ int arping_main(int argc, char **argv)
 
 		hp = gethostbyname2(target, AF_INET);
 		if (!hp) {
-			bb_error_msg("invalid or unknown target %s", target);
-			exit(2);
+			bb_error_msg_and_die("invalid or unknown target %s", target);
 		}
 		memcpy(&dst, hp->h_addr, 4);
 	}
 
 	if (source && !inet_aton(source, &src)) {
-		bb_error_msg("invalid source address %s", source);
-		exit(2);
+		bb_error_msg_and_die("invalid source address %s", source);
 	}
 
-	if (!dad && unsolicited && src.s_addr == 0)
+	if (!cfg.dad && cfg.unsolicited && src.s_addr == 0)
 		src = dst;
 
-	if (!dad || src.s_addr) {
+	if (!cfg.dad || src.s_addr) {
 		struct sockaddr_in saddr;
 		int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
 
 		if (probe_fd < 0) {
-			bb_error_msg("socket");
-			exit(2);
+			bb_error_msg_and_die("socket");
 		}
 		if (device) {
 			if (setsockopt
@@ -399,10 +393,9 @@ int arping_main(int argc, char **argv)
 		if (src.s_addr) {
 			saddr.sin_addr = src;
 			if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
-				bb_error_msg("bind");
-				exit(2);
+				bb_error_msg_and_die("bind");
 			}
-		} else if (!dad) {
+		} else if (!cfg.dad) {
 			int on = 1;
 			socklen_t alen = sizeof(saddr);
 
@@ -412,16 +405,14 @@ int arping_main(int argc, char **argv)
 			if (setsockopt
 				(probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on,
 				 sizeof(on)) == -1)
-				perror("WARNING: setsockopt(SO_DONTROUTE)");
+				bb_perror_msg("WARNING: setsockopt(SO_DONTROUTE)");
 			if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
 				== -1) {
-				bb_error_msg("connect");
-				exit(2);
+				bb_error_msg_and_die("connect");
 			}
 			if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
 				-1) {
-				bb_error_msg("getsockname");
-				exit(2);
+				bb_error_msg_and_die("getsockname");
 			}
 			src = saddr.sin_addr;
 		}
@@ -432,34 +423,31 @@ int arping_main(int argc, char **argv)
 	me.sll_ifindex = ifindex;
 	me.sll_protocol = htons(ETH_P_ARP);
 	if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) {
-		bb_error_msg("bind");
-		exit(2);
+		bb_error_msg_and_die("bind");
 	}
 
 	{
 		socklen_t alen = sizeof(me);
 
 		if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
-			bb_error_msg("getsockname");
-			exit(2);
+			bb_error_msg_and_die("getsockname");
 		}
 	}
 	if (me.sll_halen == 0) {
 		bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
-		exit(dad ? 0 : 2);
+		exit(cfg.dad ? 0 : 2);
 	}
 	he = me;
 	memset(he.sll_addr, -1, he.sll_halen);
 
-	if (!quiet) {
+	if (!cfg.quiet) {
 		printf("ARPING to %s", inet_ntoa(dst));
 		printf(" from %s via %s\n", inet_ntoa(src),
 			   device ? device : "unknown");
 	}
 
-	if (!src.s_addr && !dad) {
-		bb_error_msg("no src address in the non-DAD mode");
-		exit(2);
+	if (!src.s_addr && !cfg.dad) {
+		bb_error_msg_and_die("no src address in the non-DAD mode");
 	}
 
 	{