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