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- /*
- * Copyright (c) 2001-2016 Willem Dijkstra
- * 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.
- *
- * 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 HOLDERS 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.
- *
- */
- /*
- * Get current interface statistics from kernel and return them in symon_buf as
- *
- * ipackets : opackets : ibytes : obytes : imcasts : omcasts : ierrors :
- * oerrors : colls : drops
- */
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <inttypes.h>
- #include <string.h>
- #include <unistd.h>
- #include "conf.h"
- #include "xmalloc.h"
- #include "error.h"
- #include "symon.h"
- /* Globals for this module start with if_ */
- static void *if_buf = NULL;
- static int if_size = 0;
- static int if_maxsize = 0;
- struct if_device_stats
- {
- u_int64_t rx_packets; /* total packets received */
- u_int64_t tx_packets; /* total packets transmitted */
- u_int64_t rx_bytes; /* total bytes received */
- u_int64_t tx_bytes; /* total bytes transmitted */
- u_int64_t rx_errors; /* bad packets received */
- u_int64_t tx_errors; /* packet transmit problems */
- u_int64_t rx_dropped; /* no space in linux buffers */
- u_int64_t tx_dropped; /* no space available in linux */
- u_int64_t multicast; /* multicast packets received */
- u_int64_t collisions;
- u_int64_t rx_frame_errors; /* recv'd frame alignment error */
- u_int64_t rx_fifo_errors; /* recv'r fifo overrun */
- u_int64_t tx_carrier_errors;
- u_int64_t tx_fifo_errors;
- u_int64_t rx_compressed;
- u_int64_t tx_compressed;
- /* aggregates */
- u_int64_t errors_in;
- u_int64_t errors_out;
- u_int64_t drops;
- };
- void
- init_if(struct stream *st)
- {
- if (if_buf == NULL) {
- if_maxsize = SYMON_MAX_OBJSIZE;
- if_buf = xmalloc(if_maxsize);
- }
- snprintf(st->parg.ifname, sizeof(st->parg.ifname), "%s:", st->arg);
- info("started module if(%.200s)", st->arg);
- }
- void
- gets_if()
- {
- int fd;
- if ((fd = open("/proc/net/dev", O_RDONLY)) < 0) {
- warning("cannot access /proc/net/dev: %.200s", strerror(errno));
- return;
- }
- bzero(if_buf, if_maxsize);
- if_size = read(fd, if_buf, if_maxsize);
- close(fd);
- if (if_size == if_maxsize) {
- /* buffer is too small to hold all interface data */
- if_maxsize += SYMON_MAX_OBJSIZE;
- if (if_maxsize > SYMON_MAX_OBJSIZE * SYMON_MAX_DOBJECTS) {
- fatal("%s:%d: dynamic object limit (%d) exceeded for if data",
- __FILE__, __LINE__, SYMON_MAX_OBJSIZE * SYMON_MAX_DOBJECTS);
- }
- if_buf = xrealloc(if_buf, if_maxsize);
- gets_if();
- return;
- }
- if (if_size == -1) {
- warning("could not read if statistics from /proc/net/dev: %.200s", strerror(errno));
- }
- }
- int
- get_if(char *symon_buf, int maxlen, struct stream *st)
- {
- char *line;
- struct if_device_stats stats;
- if (if_size <= 0) {
- return 0;
- }
- if ((line = strstr(if_buf, st->parg.ifname)) == NULL) {
- warning("could not find interface %s", st->arg);
- return 0;
- }
- line += strlen(st->parg.ifname);
- bzero(&stats, sizeof(struct if_device_stats));
- /* Inter-| Receive | Transmit
- * face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
- */
- if (16 > sscanf(line, "%" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64 " %"
- SCNu64 " %" SCNu64 " %" SCNu64 " %"
- SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64 " %" SCNu64 " %"
- SCNu64 " %" SCNu64 " %" SCNu64 "\n",
- &stats.rx_bytes, &stats.rx_packets, &stats.rx_errors, &stats.rx_dropped, &stats.rx_fifo_errors,
- &stats.rx_frame_errors, &stats.rx_compressed, &stats.multicast,
- &stats.tx_bytes, &stats.tx_packets, &stats.tx_errors, &stats.tx_dropped, &stats.tx_fifo_errors,
- &stats.collisions, &stats.tx_carrier_errors, &stats.tx_compressed)) {
- warning("could not parse interface statistics for %.200s", st->arg);
- return 0;
- }
- stats.errors_in = (stats.rx_errors + stats.rx_fifo_errors + stats.rx_frame_errors);
- stats.errors_out = (stats.tx_errors + stats.tx_fifo_errors + stats.tx_carrier_errors);
- stats.drops = (stats.rx_dropped + stats.tx_dropped);
- return snpack(symon_buf, maxlen, st->arg, MT_IF2,
- (u_int64_t) stats.rx_packets,
- (u_int64_t) stats.tx_packets,
- (u_int64_t) stats.rx_bytes,
- (u_int64_t) stats.tx_bytes,
- (u_int64_t) stats.multicast,
- (u_int64_t) 0,
- (u_int64_t) stats.errors_in,
- (u_int64_t) stats.errors_out,
- (u_int64_t) stats.collisions,
- (u_int64_t) stats.drops);
- }
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