/*
- * $Id: ping.c,v 1.1 1999/12/07 23:14:59 andersen Exp $
+ * $Id: ping.c,v 1.6 1999/12/11 08:41:28 andersen Exp $
* Mini ping implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
#define MAXPACKET 65468
#define MAX_DUP_CHK (8 * 128)
#define MAXWAIT 10
+#define PINGINTERVAL 1 /* second */
#define O_QUIET (1 << 0)
#define CLR(bit) (A(bit) &= (~B(bit)))
#define TST(bit) (A(bit) & B(bit))
-static const char* ping_usage = "ping [OPTION]... host\n\n"
-"Options:\n"
-"\t-q\t\tquiet\n"
-"\t-c\t\tping count\n";
-
-static char *hostname = NULL;
-static struct sockaddr_in pingaddr;
-static int pingsock = -1;
-static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
-static int myid = 0, options = 0;
-static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
-static char rcvd_tbl[MAX_DUP_CHK / 8];
-
-static void pingstats(int);
-static void sendping(int);
-static void unpack(char *, int, struct sockaddr_in *);
-static void ping(char *);
-static int in_cksum(unsigned short *, int);
-
-/**************************************************************************/
-
+/* common routines */
static int in_cksum(unsigned short *buf, int sz)
{
int nleft = sz;
return(ans);
}
+/* simple version */
+#ifdef BB_SIMPLE_PING
+static const char* ping_usage = "ping host\n\n";
+
+static char* hostname = NULL;
+
+static void noresp(int ign)
+{
+ 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;
+ }
+ 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);
+}
+
+extern int ping_main(int argc, char **argv)
+{
+ argc--;
+ argv++;
+ if (argc < 1) usage(ping_usage);
+ ping(*argv);
+ exit(TRUE);
+}
+
+#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 and when finished.\n"
+"\t-c COUNT\tSend only COUNT pings.\n";
+
+static char *hostname = NULL;
+static struct sockaddr_in pingaddr;
+static int pingsock = -1;
+
+static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
+static int myid = 0, options = 0;
+static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
+static char rcvd_tbl[MAX_DUP_CHK / 8];
+
+static void sendping(int);
+static void pingstats(int);
+static void unpack(char *, int, struct sockaddr_in *);
+
+static void ping(char *);
+
+/**************************************************************************/
+
static void pingstats(int ign) {
signal(SIGINT, SIG_IGN);
}
signal(SIGALRM, sendping);
- if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next */
- alarm(1);
+ 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);
exit(1);
}
-#ifdef SUID_BUSYBOX
+ /* drop root privs if running setuid */
setuid(getuid());
-#endif
memset(&pingaddr, 0, sizeof(struct sockaddr_in));
pingaddr.sin_family = AF_INET;
- if (inet_aton(host, &pingaddr.sin_addr)) {
- hostname = host;
- } else {
- if (!(h = gethostbyname(host))) {
- fprintf(stderr, "ping: unknown host %s\n", host);
- exit(1);
- }
+ 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;
+ 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;
extern int ping_main(int argc, char **argv)
{
+ char *thisarg;
+
argc--;
argv++;
options = 0;
/* Parse any options */
- if (argc < 1) usage(ping_usage);
-
- while (**argv == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 'c':
- argc--; argv++;
- if (argc < 1) usage(ping_usage);
- pingcount = atoi(*argv);
- break;
- case 'q':
- options |= O_QUIET;
- break;
- default:
- usage(ping_usage);
- }
- argc--;
- argv++;
+ 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);
+ if (argc < 1) usage(ping_usage);
myid = getpid() & 0xFFFF;
- ping(*(argv++));
- exit( TRUE);
+ ping(*argv);
+ exit(TRUE);
}
+#endif
/*
* Copyright (c) 1989 The Regents of the University of California.
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
-
-
projects / oweals / busybox.git / blobdiff