Some formatting updates (ran the code through indent)

 -Erik

1 files changed, 324 insertions, 294 deletions

diff --git a/ping.c b/ping.c
index 3ffbdc5..c9cf5ff 100644
--- a/ping.c
+++ b/ping.c
@@ -1,5 +1,6 @@
+/* vi: set sw=4 ts=4: */
 /*
- * $Id: ping.c,v 1.10 2000/02/07 05:29:42 erik Exp $
+ * $Id: ping.c,v 1.11 2000/02/08 19:58:47 erik Exp $
  * Mini ping implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@@ -53,7 +54,7 @@
 #define	MAXPACKET	65468
 #define	MAX_DUP_CHK	(8 * 128)
 #define MAXWAIT         10
-#define PINGINTERVAL    1 /* second */
+#define PINGINTERVAL    1		/* second */
 
 #define O_QUIET         (1 << 0)
 
@@ -66,118 +67,124 @@
 /* common routines */
 static int in_cksum(unsigned short *buf, int sz)
 {
-    int nleft = sz;
-    int sum = 0;
-    unsigned short *w = buf;
-    unsigned short ans = 0;
-
-    while (nleft > 1) {
-        sum += *w++;
-        nleft -= 2;
-    }
-
-    if (nleft == 1) { 
-        *(unsigned char *)(&ans) = *(unsigned char *)w;
-        sum += ans;
-    }
-
-    sum = (sum >> 16) + (sum & 0xFFFF);
-    sum += (sum >> 16);
-    ans = ~sum;
-    return(ans);
-}   
+	int nleft = sz;
+	int sum = 0;
+	unsigned short *w = buf;
+	unsigned short ans = 0;
+
+	while (nleft > 1) {
+		sum += *w++;
+		nleft -= 2;
+	}
+
+	if (nleft == 1) {
+		*(unsigned char *) (&ans) = *(unsigned char *) w;
+		sum += ans;
+	}
+
+	sum = (sum >> 16) + (sum & 0xFFFF);
+	sum += (sum >> 16);
+	ans = ~sum;
+	return (ans);
+}
 
 /* simple version */
 #ifdef BB_SIMPLE_PING
-static const char* ping_usage = "ping host\n\n";
+static const char *ping_usage = "ping host\n\n";
 
-static char* hostname = NULL;
+static char *hostname = NULL;
 
 static void noresp(int ign)
 {
-    printf("No response from %s\n", hostname);
-    exit(0);
+	printf("No response from %s\n", hostname);
+	exit(0);
 }
 
 static int ping(const char *host)
 {
-    struct hostent *h;
-    struct sockaddr_in pingaddr;
-    struct icmp *pkt;
-    int pingsock, c;
-    char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
-    
-    if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) { /* 1 == ICMP */
-        perror("ping");
-	exit(1);
-    }
-
-    /* drop root privs if running setuid */
-    setuid(getuid());
-    
-    memset(&pingaddr, 0, sizeof(struct sockaddr_in));
-    pingaddr.sin_family = AF_INET;
-    if (!(h = gethostbyname(host))) {
-        fprintf(stderr, "ping: unknown host %s\n", host);
-        exit(1);
-    }	
-    memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
-    hostname = h->h_name;
-
-    pkt = (struct icmp *)packet;
-    memset(pkt, 0, sizeof(packet));    
-    pkt->icmp_type = ICMP_ECHO;    
-    pkt->icmp_cksum = in_cksum((unsigned short *)pkt, sizeof(packet));
-   
-    c = sendto(pingsock, packet, sizeof(packet), 0, 
-	       (struct sockaddr *)&pingaddr, sizeof(struct sockaddr_in));
-
-    if (c < 0 || c != sizeof(packet)) {
-        if (c < 0) perror("ping");
-        fprintf(stderr, "ping: write incomplete\n");
-	exit(1);
-    }
-
-    signal(SIGALRM, noresp);
-    alarm(5); /* give the host 5000ms to respond */
-    /* listen for replies */
-    while (1) {
-        struct sockaddr_in from;
-	size_t fromlen = sizeof(from);
-
-        if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
-                          (struct sockaddr *)&from, &fromlen)) < 0) {
-            if (errno == EINTR) continue;
-	    perror("ping");
-	    continue;
+	struct hostent *h;
+	struct sockaddr_in pingaddr;
+	struct icmp *pkt;
+	int pingsock, c;
+	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+
+	if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) {	/* 1 == ICMP */
+		perror("ping");
+		exit(1);
+	}
+
+	/* drop root privs if running setuid */
+	setuid(getuid());
+
+	memset(&pingaddr, 0, sizeof(struct sockaddr_in));
+
+	pingaddr.sin_family = AF_INET;
+	if (!(h = gethostbyname(host))) {
+		fprintf(stderr, "ping: unknown host %s\n", host);
+		exit(1);
+	}
+	memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
+	hostname = h->h_name;
+
+	pkt = (struct icmp *) packet;
+	memset(pkt, 0, sizeof(packet));
+	pkt->icmp_type = ICMP_ECHO;
+	pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
+
+	c = sendto(pingsock, packet, sizeof(packet), 0,
+			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
+
+	if (c < 0 || c != sizeof(packet)) {
+		if (c < 0)
+			perror("ping");
+		fprintf(stderr, "ping: write incomplete\n");
+		exit(1);
+	}
+
+	signal(SIGALRM, noresp);
+	alarm(5);					/* give the host 5000ms to respond */
+	/* listen for replies */
+	while (1) {
+		struct sockaddr_in from;
+		size_t fromlen = sizeof(from);
+
+		if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
+						  (struct sockaddr *) &from, &fromlen)) < 0) {
+			if (errno == EINTR)
+				continue;
+			perror("ping");
+			continue;
+		}
+		if (c >= 76) {			/* ip + icmp */
+			struct iphdr *iphdr = (struct iphdr *) packet;
+
+			pkt = (struct icmp *) (packet + (iphdr->ihl << 2));	/* skip ip hdr */
+			if (pkt->icmp_type == ICMP_ECHOREPLY)
+				break;
+		}
 	}
-        if (c >= 76) { /* ip + icmp */
-            struct iphdr *iphdr = (struct iphdr *)packet;
-	    pkt = (struct icmp *)(packet + (iphdr->ihl << 2)); /* skip ip hdr */
-	    if (pkt->icmp_type == ICMP_ECHOREPLY) break;
-        }	   
-    }
-    printf("%s is alive!\n", hostname);
-    return(TRUE);
+	printf("%s is alive!\n", hostname);
+	return (TRUE);
 }
 
 extern int ping_main(int argc, char **argv)
 {
-    argc--;
-    argv++;
-    if (argc < 1) usage(ping_usage);
-    ping(*argv);
-    exit(TRUE);
+	argc--;
+	argv++;
+	if (argc < 1)
+		usage(ping_usage);
+	ping(*argv);
+	exit(TRUE);
 }
 
-#else 
+#else
 /* full(er) version */
-static const char* ping_usage = "ping [OPTION]... host\n\n"
-"Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
-"Options:\n"
-"\t-q\t\tQuiet mode, only displays output at start"
-"\t\t\tand when finished.\n"
-"\t-c COUNT\tSend only COUNT pings.\n";
+static const char *ping_usage = "ping [OPTION]... host\n\n"
+	"Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
+	"Options:\n"
+	"\t-q\t\tQuiet mode, only displays output at start"
+
+	"\t\t\tand when finished.\n" "\t-c COUNT\tSend only COUNT pings.\n";
 
 static char *hostname = NULL;
 static struct sockaddr_in pingaddr;
@@ -196,224 +203,247 @@ static void ping(char *);
 
 /**************************************************************************/
 
-static void pingstats(int ign) {
-    signal(SIGINT, SIG_IGN);
-    
-    printf("\n--- %s ping statistics ---\n", hostname);
-    printf("%ld packets transmitted, ", ntransmitted);
-    printf("%ld packets received, ", nreceived);
-    if (nrepeats)
-        printf("%ld duplicates, ", nrepeats);
-    if (ntransmitted)
-	printf("%ld%% packet loss\n", 
-	       (ntransmitted - nreceived)*100/ntransmitted);
-    if (nreceived)
-        printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
-	       tmin/10, tmin%10, 
-	       (tsum/(nreceived+nrepeats))/10,
-	       (tsum/(nreceived+nrepeats))%10,
-	       tmax/10, tmax%10);
-    exit(0);
+static void pingstats(int ign)
+{
+	signal(SIGINT, SIG_IGN);
+
+	printf("\n--- %s ping statistics ---\n", hostname);
+	printf("%ld packets transmitted, ", ntransmitted);
+	printf("%ld packets received, ", nreceived);
+	if (nrepeats)
+		printf("%ld duplicates, ", nrepeats);
+	if (ntransmitted)
+		printf("%ld%% packet loss\n",
+			   (ntransmitted - nreceived) * 100 / ntransmitted);
+	if (nreceived)
+		printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
+			   tmin / 10, tmin % 10,
+			   (tsum / (nreceived + nrepeats)) / 10,
+			   (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
+	exit(0);
 }
 
 static void sendping(int ign)
 {
-    struct icmp *pkt;
-    int i;
-    char packet[DEFDATALEN + 8];
-
-    pkt = (struct icmp *)packet;
-    
-    pkt->icmp_type = ICMP_ECHO;
-    pkt->icmp_code = 0;
-    pkt->icmp_cksum = 0;
-    pkt->icmp_seq = ntransmitted++;
-    pkt->icmp_id = myid; 
-    CLR(pkt->icmp_seq % MAX_DUP_CHK);
-
-    gettimeofday((struct timeval *)&packet[8], NULL);
-    pkt->icmp_cksum = in_cksum((unsigned short *)pkt, sizeof(packet));
-    
-    i = sendto(pingsock, packet, sizeof(packet), 0, 
-	       (struct sockaddr *)&pingaddr, sizeof(struct sockaddr_in));
-
-    if (i < 0 || i != sizeof(packet)) {
-        if (i < 0) perror("ping");
-        fprintf(stderr, "ping wrote %d chars; %d expected\n", i, sizeof(packet));
-	exit(1);
-    }
-
-    signal(SIGALRM, sendping);
-    if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
-        alarm(PINGINTERVAL);
-    } else { /* done, wait for the last ping to come back */
-	/* todo, don't necessarily need to wait so long... */
-        signal(SIGALRM, pingstats);
-	alarm(MAXWAIT);
-    }
+	struct icmp *pkt;
+	int i;
+	char packet[DEFDATALEN + 8];
+
+	pkt = (struct icmp *) packet;
+
+	pkt->icmp_type = ICMP_ECHO;
+	pkt->icmp_code = 0;
+	pkt->icmp_cksum = 0;
+	pkt->icmp_seq = ntransmitted++;
+	pkt->icmp_id = myid;
+	CLR(pkt->icmp_seq % MAX_DUP_CHK);
+
+	gettimeofday((struct timeval *) &packet[8], NULL);
+	pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
+
+	i = sendto(pingsock, packet, sizeof(packet), 0,
+			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
+
+	if (i < 0 || i != sizeof(packet)) {
+		if (i < 0)
+			perror("ping");
+		fprintf(stderr, "ping wrote %d chars; %d expected\n", i,
+				sizeof(packet));
+		exit(1);
+	}
+
+	signal(SIGALRM, sendping);
+	if (pingcount == 0 || ntransmitted < pingcount) {	/* schedule next in 1s */
+		alarm(PINGINTERVAL);
+	} else {					/* done, wait for the last ping to come back */
+		/* todo, don't necessarily need to wait so long... */
+		signal(SIGALRM, pingstats);
+		alarm(MAXWAIT);
+	}
 }
-    
+
 static void unpack(char *buf, int sz, struct sockaddr_in *from)
 {
-    struct icmp *icmppkt;
-    struct iphdr *iphdr;
-    struct timeval tv, *tp;
-    int hlen, dupflag;
-    unsigned long triptime;
-    
-    gettimeofday(&tv, NULL);
-    
-    /* check IP header */
-    iphdr = (struct iphdr *)buf;
-    hlen = iphdr->ihl << 2;
-    /* discard if too short */
-    if (sz < (DEFDATALEN + ICMP_MINLEN)) return;
-
-    sz -= hlen;
-    icmppkt = (struct icmp *)(buf + hlen);
-    
-    if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
-        if (icmppkt->icmp_id != myid) return; /* not our ping */
-	++nreceived;
-	tp = (struct timeval *)icmppkt->icmp_data;
-
-	if ((tv.tv_usec -= tp->tv_usec) < 0) {
-	    --tv.tv_sec;
-	    tv.tv_usec += 1000000;
-	}
-	tv.tv_sec -= tp->tv_sec;
-	
-	triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
-	tsum += triptime;
-	if (triptime < tmin) tmin = triptime;
-	if (triptime > tmax) tmax = triptime;
-
-	if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
-	    ++nrepeats;
-	    --nreceived;
-	    dupflag = 1;
+	struct icmp *icmppkt;
+	struct iphdr *iphdr;
+	struct timeval tv, *tp;
+	int hlen, dupflag;
+	unsigned long triptime;
+
+	gettimeofday(&tv, NULL);
+
+	/* check IP header */
+	iphdr = (struct iphdr *) buf;
+	hlen = iphdr->ihl << 2;
+	/* discard if too short */
+	if (sz < (DEFDATALEN + ICMP_MINLEN))
+		return;
+
+	sz -= hlen;
+	icmppkt = (struct icmp *) (buf + hlen);
+
+	if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
+		if (icmppkt->icmp_id != myid)
+			return;				/* not our ping */
+		++nreceived;
+		tp = (struct timeval *) icmppkt->icmp_data;
+
+		if ((tv.tv_usec -= tp->tv_usec) < 0) {
+			--tv.tv_sec;
+			tv.tv_usec += 1000000;
+		}
+		tv.tv_sec -= tp->tv_sec;
+
+		triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
+		tsum += triptime;
+		if (triptime < tmin)
+			tmin = triptime;
+		if (triptime > tmax)
+			tmax = triptime;
+
+		if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
+			++nrepeats;
+			--nreceived;
+			dupflag = 1;
+		} else {
+			SET(icmppkt->icmp_seq % MAX_DUP_CHK);
+			dupflag = 0;
+		}
+
+		if (options & O_QUIET)
+			return;
+
+		printf("%d bytes from %s: icmp_seq=%u", sz,
+			   inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
+			   icmppkt->icmp_seq);
+		printf(" ttl=%d", iphdr->ttl);
+		printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
+		if (dupflag)
+			printf(" (DUP!)");
+		printf("\n");
 	} else {
-	    SET(icmppkt->icmp_seq % MAX_DUP_CHK);
-	    dupflag = 0;
+		fprintf(stderr,
+				"Warning: unknown ICMP packet received (not echo-reply)\n");
 	}
-
-	if (options & O_QUIET) return;
-
-	printf("%d bytes from %s: icmp_seq=%u", sz, 
-	       inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
-	       icmppkt->icmp_seq);
-	printf(" ttl=%d", iphdr->ttl);
-	printf(" time=%lu.%lu ms", triptime/10, triptime%10);
-	if (dupflag) printf(" (DUP!)");
-        printf("\n");
-    } else {
-        fprintf(stderr, "Warning: unknown ICMP packet received (not echo-reply)\n");
-    }	
 }
 
 static void ping(char *host)
 {
-    struct protoent *proto;
-    struct hostent *h;
-    char buf[MAXHOSTNAMELEN];
-    char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
-    int sockopt;
-    
-    proto = getprotobyname("icmp");
-    /* if getprotobyname failed, just silently force 
-     * proto->p_proto to have the correct value for "icmp" */
-    if ((pingsock = socket(AF_INET, SOCK_RAW, 
-                           (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
-	if (errno == EPERM) {
-	    fprintf(stderr, "ping: permission denied. (are you root?)\n");
-	} else {
-	    perror("ping");
+	struct protoent *proto;
+	struct hostent *h;
+	char buf[MAXHOSTNAMELEN];
+	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+	int sockopt;
+
+	proto = getprotobyname("icmp");
+	/* if getprotobyname failed, just silently force 
+	 * proto->p_proto to have the correct value for "icmp" */
+	if ((pingsock = socket(AF_INET, SOCK_RAW,
+						   (proto ? proto->p_proto : 1))) < 0) {	/* 1 == ICMP */
+		if (errno == EPERM) {
+			fprintf(stderr, "ping: permission denied. (are you root?)\n");
+		} else {
+			perror("ping");
+		}
+		exit(1);
 	}
-	exit(1);
-    }
-
-    /* drop root privs if running setuid */
-    setuid(getuid());
-    
-    memset(&pingaddr, 0, sizeof(struct sockaddr_in));
-    pingaddr.sin_family = AF_INET;
-    if (!(h = gethostbyname(host))) {
-        fprintf(stderr, "ping: unknown host %s\n", host);
-        exit(1);
-    }
-
-    if (h->h_addrtype != AF_INET) {
-        fprintf(stderr, "ping: unknown address type; only AF_INET is currently supported.\n");
-        exit(1);
-    }
-	
-    pingaddr.sin_family = AF_INET; /* h->h_addrtype */
-    memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); 
-    strncpy(buf, h->h_name, sizeof(buf)-1);
-    hostname = buf;
-
-    /* enable broadcast pings */
-    sockopt = 1;
-    setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *)&sockopt, sizeof(sockopt));
-    
-    /* set recv buf for broadcast pings */
-    sockopt = 48 * 1024;
-    setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *)&sockopt, sizeof(sockopt));
-
-    printf("PING %s (%s): %d data bytes\n", 
-           hostname, inet_ntoa(*(struct in_addr *)&pingaddr.sin_addr.s_addr),
-	   DEFDATALEN);
-
-    signal(SIGINT, pingstats);
-    
-    /* start the ping's going ... */
-    sendping(0);
-	
-    /* listen for replies */
-    while (1) {
-        struct sockaddr_in from;
-	size_t fromlen = sizeof(from);
-        int c;
-
-        if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
-                          (struct sockaddr *)&from, &fromlen)) < 0) {
-            if (errno == EINTR) continue;
-	    perror("ping");
-	    continue;
+
+	/* drop root privs if running setuid */
+	setuid(getuid());
+
+	memset(&pingaddr, 0, sizeof(struct sockaddr_in));
+
+	pingaddr.sin_family = AF_INET;
+	if (!(h = gethostbyname(host))) {
+		fprintf(stderr, "ping: unknown host %s\n", host);
+		exit(1);
+	}
+
+	if (h->h_addrtype != AF_INET) {
+		fprintf(stderr,
+				"ping: unknown address type; only AF_INET is currently supported.\n");
+		exit(1);
 	}
-	unpack(packet, c, &from);
-	if (pingcount > 0 && nreceived >= pingcount) break;	
-    }
-    pingstats(0);
+
+	pingaddr.sin_family = AF_INET;	/* h->h_addrtype */
+	memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
+	strncpy(buf, h->h_name, sizeof(buf) - 1);
+	hostname = buf;
+
+	/* enable broadcast pings */
+	sockopt = 1;
+	setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	/* set recv buf for broadcast pings */
+	sockopt = 48 * 1024;
+	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	printf("PING %s (%s): %d data bytes\n",
+		   hostname,
+		   inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
+		   DEFDATALEN);
+
+	signal(SIGINT, pingstats);
+
+	/* start the ping's going ... */
+	sendping(0);
+
+	/* listen for replies */
+	while (1) {
+		struct sockaddr_in from;
+		size_t fromlen = sizeof(from);
+		int c;
+
+		if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
+						  (struct sockaddr *) &from, &fromlen)) < 0) {
+			if (errno == EINTR)
+				continue;
+			perror("ping");
+			continue;
+		}
+		unpack(packet, c, &from);
+		if (pingcount > 0 && nreceived >= pingcount)
+			break;
+	}
+	pingstats(0);
 }
 
 extern int ping_main(int argc, char **argv)
 {
-    char *thisarg;
-    
-    argc--;
-    argv++;
-    options = 0;
-    /* Parse any options */
-    while (argc > 1) {
-        if (**argv != '-') usage(ping_usage);
-        thisarg = *argv; thisarg++;
-        switch (*thisarg) {
-	    case 'q': options |= O_QUIET; break;
- 	    case 'c':
-	        argc--; argv++;
-	        pingcount = atoi(*argv);	        
-	        break;
-  	    default:
-	        usage(ping_usage);
-        }
-        argc--; argv++;
-    }
-    if (argc < 1) usage(ping_usage);       
-
-    myid = getpid() & 0xFFFF;
-    ping(*argv);
-    exit(TRUE);
+	char *thisarg;
+
+	argc--;
+	argv++;
+	options = 0;
+	/* Parse any options */
+	while (argc > 1) {
+		if (**argv != '-')
+			usage(ping_usage);
+		thisarg = *argv;
+		thisarg++;
+		switch (*thisarg) {
+		case 'q':
+			options |= O_QUIET;
+			break;
+		case 'c':
+			argc--;
+			argv++;
+			pingcount = atoi(*argv);
+			break;
+		default:
+			usage(ping_usage);
+		}
+		argc--;
+		argv++;
+	}
+	if (argc < 1)
+		usage(ping_usage);
+
+	myid = getpid() & 0xFFFF;
+	ping(*argv);
+	exit(TRUE);
 }
 #endif