Initial Contribution
diff --git a/toolbox/iftop.c b/toolbox/iftop.c
new file mode 100644
index 0000000..800c0f0
--- /dev/null
+++ b/toolbox/iftop.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2008, The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google, Inc. nor the names of its contributors
+ * may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
+#define PROC_NET_DEV "/proc/net/dev"
+
+#define MAX_IF 8 /* max interfaces we can handle */
+
+#ifndef PAGE_SIZE
+# define PAGE_SIZE 4096
+#endif
+
+#define _STR(s) #s
+#define STR(s) _STR(s)
+
+struct if_stats {
+ char name[IFNAMSIZ];
+
+ unsigned int mtu;
+
+ unsigned int rx_bytes;
+ unsigned int rx_packets;
+ unsigned int rx_errors;
+ unsigned int rx_dropped;
+
+ unsigned int tx_bytes;
+ unsigned int tx_packets;
+ unsigned int tx_errors;
+ unsigned int tx_dropped;
+};
+
+static int get_mtu(const char *if_name)
+{
+ struct ifreq ifr;
+ int s, ret;
+
+ s = socket(AF_INET, SOCK_DGRAM, 0);
+ if (s < 0) {
+ perror("socket");
+ exit(EXIT_FAILURE);
+ }
+
+ memset(&ifr, 0, sizeof(struct ifreq));
+ ifr.ifr_addr.sa_family = AF_INET;
+ strcpy(ifr.ifr_name, if_name);
+
+ ret = ioctl(s, SIOCGIFMTU, &ifr);
+ if (ret < 0) {
+ perror("ioctl");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = close(s);
+ if (ret < 0) {
+ perror("close");
+ exit(EXIT_FAILURE);
+ }
+
+ return ifr.ifr_mtu;
+}
+
+static int get_interfaces(struct if_stats *ifs)
+{
+ char buf[PAGE_SIZE];
+ char *p;
+ int ret, nr, fd;
+
+ fd = open(PROC_NET_DEV, O_RDONLY);
+ if (fd < 0) {
+ perror("open");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = read(fd, buf, sizeof(buf) - 1);
+ if (ret < 0) {
+ perror("read");
+ exit(EXIT_FAILURE);
+ } else if (!ret) {
+ fprintf(stderr, "reading " PROC_NET_DEV " returned premature EOF\n");
+ exit(EXIT_FAILURE);
+ }
+ buf[ret] = '\0';
+
+ /* skip down to the third line */
+ p = strchr(buf, '\n');
+ if (!p) {
+ fprintf(stderr, "parsing " PROC_NET_DEV " failed unexpectedly\n");
+ exit(EXIT_FAILURE);
+ }
+ p = strchr(p + 1, '\n');
+ if (!p) {
+ fprintf(stderr, "parsing " PROC_NET_DEV " failed unexpectedly\n");
+ exit(EXIT_FAILURE);
+ }
+ p += 1;
+
+ /*
+ * Key:
+ * if: (Rx) bytes packets errs drop fifo frame compressed multicast \
+ * (Tx) bytes packets errs drop fifo colls carrier compressed
+ */
+ for (nr = 0; nr < MAX_IF; nr++) {
+ char *c;
+
+ ret = sscanf(p, "%" STR(IFNAMSIZ) "s", ifs->name);
+ if (ret != 1) {
+ fprintf(stderr, "parsing " PROC_NET_DEV " failed unexpectedly\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /*
+ * This works around a bug in the proc file where large interface names
+ * or Rx byte counts eat the delimiter, breaking sscanf.
+ */
+ c = strchr(ifs->name, ':');
+ if (c)
+ *c = '\0';
+
+ p = strchr(p, ':') + 1;
+
+ ret = sscanf(p, "%u %u %u %u %*u %*u %*u %*u %u %u %u %u %*u %*u "
+ "%*u %*u\n", &ifs->rx_bytes, &ifs->rx_packets,
+ &ifs->rx_errors, &ifs->rx_dropped, &ifs->tx_bytes,
+ &ifs->tx_packets, &ifs->tx_errors, &ifs->tx_dropped);
+ if (ret != 8) {
+ fprintf(stderr, "parsing " PROC_NET_DEV " failed unexpectedly\n");
+ exit(EXIT_FAILURE);
+ }
+
+ ifs->mtu = get_mtu(ifs->name);
+
+ p = strchr(p, '\n') + 1;
+ if (*p == '\0') {
+ nr++;
+ break;
+ }
+
+ ifs++;
+ }
+
+ ret = close(fd);
+ if (ret) {
+ perror("close");
+ exit(EXIT_FAILURE);
+ }
+
+ return nr;
+}
+
+static void print_header(void)
+{
+ printf(" Rx Tx\n");
+ printf("%-8s %-5s %-10s %-8s %-5s %-5s %-10s %-8s %-5s %-5s\n",
+ "name", "MTU", "bytes", "packets", "errs", "drpd", "bytes",
+ "packets", "errs", "drpd");
+}
+
+static int print_interfaces(struct if_stats *old, struct if_stats *new, int nr)
+{
+ int i = 0;
+
+ while (nr--) {
+ if (old->rx_packets || old->tx_packets) {
+ printf("%-8s %-5u %-10u %-8u %-5u %-5u %-10u %-8u %-5u %-5u\n",
+ new->name, new->mtu,
+ new->rx_bytes - old->rx_bytes,
+ new->rx_packets - old->rx_packets,
+ new->rx_errors - old->rx_errors,
+ new->rx_dropped - old->rx_dropped,
+ new->tx_bytes - old->tx_bytes,
+ new->tx_packets - old->tx_packets,
+ new->tx_errors - old->tx_errors,
+ new->tx_dropped - old->tx_dropped);
+ i++;
+ }
+ old++;
+ new++;
+ }
+
+ return i;
+}
+
+static void usage(const char *cmd)
+{
+ fprintf(stderr, "usage: %s [ -r repeats] [ -d delay ]\n", cmd);
+}
+
+int iftop_main(int argc, char *argv[])
+{
+ struct if_stats ifs[2][MAX_IF];
+ int count = 0, header_interval = 22, delay = 1, i;
+ unsigned int toggle = 0;
+
+ for (i = 1; i < argc; i++) {
+ if (!strcmp(argv[i], "-d")) {
+ if (i >= argc - 1) {
+ fprintf(stderr, "Option -d requires an argument.\n");
+ exit(EXIT_FAILURE);
+ }
+ delay = atoi(argv[i++]);
+ if (!delay)
+ delay = 1;
+ continue;
+ }
+ if (!strcmp(argv[i], "-r")) {
+ if (i >= argc - 1) {
+ fprintf(stderr, "Option -r requires an argument.\n");
+ exit(EXIT_FAILURE);
+ }
+ header_interval = atoi(argv[i++]);
+ if (header_interval < MAX_IF)
+ header_interval = MAX_IF;
+ continue;
+ }
+ if (!strcmp(argv[i], "-h")) {
+ usage(argv[0]);
+ exit(EXIT_SUCCESS);
+ }
+ usage(argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ get_interfaces(ifs[!toggle]);
+ if (header_interval)
+ print_header();
+ while (1) {
+ int nr;
+
+ sleep(delay);
+ nr = get_interfaces(ifs[toggle]);
+ if (header_interval && count + nr > header_interval) {
+ print_header();
+ count = 0;
+ }
+ count += print_interfaces(ifs[!toggle], ifs[toggle], nr);
+ toggle = !toggle;
+ }
+
+ return 0;
+}