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- /* $Id: symux.c,v 1.30 2004/02/26 22:48:08 dijkstra Exp $ */
- /*
- * Copyright (c) 2001-2004 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.
- *
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <machine/endian.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sysexits.h>
- #include <syslog.h>
- #include <unistd.h>
- #include <rrd.h>
- #include "data.h"
- #include "error.h"
- #include "limits.h"
- #include "symux.h"
- #include "symuxnet.h"
- #include "net.h"
- #include "readconf.h"
- #include "share.h"
- #include "xmalloc.h"
- __BEGIN_DECLS
- void exithandler();
- void huphandler(int);
- void signalhandler(int);
- __END_DECLS
- int flag_hup = 0;
- fd_set fdset;
- int maxfd;
- void
- exithandler(int s)
- {
- info("received signal %d - quitting", s);
- exit(EX_TEMPFAIL);
- }
- void
- huphandler(int s)
- {
- info("hup received");
- flag_hup = 1;
- }
- /*
- * symux is the receiver of symon performance measurements.
- *
- * The main goals symon hopes to accomplish is:
- * - to take fine grained measurements of system parameters
- * - with minimal performance impact
- * - in a secure way.
- *
- * Measuring system parameters (e.g. interfaces) sometimes means traversing
- * lists in kernel memory. Because of this the measurement of data has been
- * decoupled from the processing and storage of data. Storing the measured
- * information that symon provides is done by a second program, called symux.
- *
- * Symon can keep track of cpu, memory, disk and network interface
- * interactions. Symon was built specifically for OpenBSD.
- */
- int
- main(int argc, char *argv[])
- {
- struct symonpacket packet;
- struct packedstream ps;
- char *cfgfile;
- char *cfgpath;
- char *stringbuf;
- char *stringptr;
- int maxstringlen;
- struct muxlist mul, newmul;
- char *arg_ra[4];
- struct stream *stream;
- struct source *source;
- struct mux *mux;
- FILE *f;
- int ch;
- int offset;
- time_t timestamp;
- int churnbuflen;
- SLIST_INIT(&mul);
- /* reset flags */
- flag_debug = 0;
- flag_daemon = 0;
- cfgfile = SYMUX_CONFIG_FILE;
- while ((ch = getopt(argc, argv, "dvf:")) != -1) {
- switch (ch) {
- case 'd':
- flag_debug = 1;
- break;
- case 'f':
- if (optarg && optarg[0] != '/') {
- /* cfg path needs to be absolute, we will be a daemon soon */
- cfgpath = xmalloc(MAXPATHLEN);
- if ((cfgpath = getcwd(cfgpath, MAXPATHLEN)) == NULL)
- fatal("could not get working directory");
- maxstringlen = strlen(cfgpath) + strlen(optarg) + 1;
- cfgfile = xmalloc(maxstringlen);
- strncpy(cfgfile, cfgpath, maxstringlen);
- stringptr = cfgfile + strlen(cfgpath);
- stringptr[0] = '/';
- stringptr++;
- strncpy(stringptr, optarg, maxstringlen - (cfgfile - stringptr));
- cfgfile[maxstringlen] = '\0';
- free(cfgpath);
- } else
- cfgfile = xstrdup(optarg);
- break;
- case 'v':
- info("symux version %s", SYMUX_VERSION);
- default:
- info("usage: %s [-d] [-v] [-f cfgfile]", __progname);
- exit(EX_USAGE);
- }
- }
- /* parse configuration file */
- if (!read_config_file(&mul, cfgfile))
- fatal("configuration contained errors; quitting");
- setegid(getgid());
- setgid(getgid());
- if (flag_debug != 1) {
- if (daemon(0, 0) != 0)
- fatal("daemonize failed");
- flag_daemon = 1;
- /* record pid */
- f = fopen(SYMUX_PID_FILE, "w");
- if (f) {
- fprintf(f, "%u\n", (u_int) getpid());
- fclose(f);
- }
- }
- info("symux version %s", SYMUX_VERSION);
- if (flag_debug == 1)
- info("program id=%d", (u_int) getpid());
- mux = SLIST_FIRST(&mul);
- churnbuflen = calculate_churnbuffer(&mux->sol);
- debug("size of churnbuffer = %d", churnbuflen);
- initshare(churnbuflen);
- /* catch signals */
- signal(SIGHUP, huphandler);
- signal(SIGINT, exithandler);
- signal(SIGQUIT, exithandler);
- signal(SIGTERM, exithandler);
- signal(SIGTERM, exithandler);
- /* prepare crc32 */
- init_crc32();
- /* prepare sockets */
- if (get_symon_sockets(mux) == 0)
- fatal("no sockets could be opened for incoming symon traffic");
- if (get_client_socket(mux) == 0)
- fatal("socket for client connections could not be opened");
- /* main loop */
- for (;;) { /* FOREVER */
- wait_for_traffic(mux, &source, &packet);
- if (flag_hup == 1) {
- flag_hup = 0;
- SLIST_INIT(&newmul);
- if (!read_config_file(&newmul, cfgfile)) {
- info("new configuration contains errors; keeping old configuration");
- free_muxlist(&newmul);
- } else {
- info("read configuration file '%.100s' successfully", cfgfile);
- free_muxlist(&mul);
- mul = newmul;
- mux = SLIST_FIRST(&mul);
- get_symon_sockets(mux);
- get_client_socket(mux);
- }
- } else {
- /*
- * Put information from packet into stringbuf (shared region).
- * Note that the stringbuf is used twice: 1) to update the
- * rrdfile and 2) to collect all the data from a single packet
- * that needs to shared to the clients. This is the reason for
- * the hasseling with stringptr.
- */
- offset = mux->offset;
- maxstringlen = shared_getmaxlen();
- /* put time:ip: into shared region */
- master_forbidread();
- timestamp = (time_t) packet.header.timestamp;
- stringbuf = (char *) shared_getmem();
- snprintf(stringbuf, maxstringlen, "%s;", source->addr);
- /* hide this string region from rrd update */
- maxstringlen -= strlen(stringbuf);
- stringptr = stringbuf + strlen(stringbuf);
- while (offset < packet.header.length) {
- bzero(&ps, sizeof(struct packedstream));
- offset += sunpack(packet.data + offset, &ps);
- /* find stream in source */
- stream = find_source_stream(source, ps.type, ps.args);
- if (stream != NULL) {
- /* put type in and hide from rrd */
- snprintf(stringptr, maxstringlen, "%s:", type2str(ps.type));
- maxstringlen -= strlen(stringptr);
- stringptr += strlen(stringptr);
- /* put arguments in and hide from rrd */
- snprintf(stringptr, maxstringlen, "%s:",
- ((ps.args == NULL) ? "0" : ps.args));
- maxstringlen -= strlen(stringptr);
- stringptr += strlen(stringptr);
- /* put timestamp in and show to rrd */
- snprintf(stringptr, maxstringlen, "%u", timestamp);
- arg_ra[3] = stringptr;
- maxstringlen -= strlen(stringptr);
- stringptr += strlen(stringptr);
- /* put measurements in */
- ps2strn(&ps, stringptr, maxstringlen, PS2STR_RRD);
- if (stream->file != NULL) {
- /* clear optind for getopt call by rrdupdate */
- optind = 0;
- /* save if file specified */
- arg_ra[0] = "rrdupdate";
- arg_ra[1] = "--";
- arg_ra[2] = stream->file;
- /*
- * This call will cost a lot (symux will become
- * unresponsive and eat up massive amounts of cpu) if
- * the rrdfile is out of sync.
- */
- rrd_update(4, arg_ra);
- if (rrd_test_error()) {
- warning("rrd_update:%.200s", rrd_get_error());
- warning("%.200s %.200s %.200s %.200s", arg_ra[0], arg_ra[1],
- arg_ra[2], arg_ra[3]);
- rrd_clear_error();
- } else {
- if (flag_debug == 1)
- debug("%.200s %.200s %.200s %.200s", arg_ra[0], arg_ra[1],
- arg_ra[2], arg_ra[3]);
- }
- }
- maxstringlen -= strlen(stringptr);
- stringptr += strlen(stringptr);
- snprintf(stringptr, maxstringlen, ";");
- maxstringlen -= strlen(stringptr);
- stringptr += strlen(stringptr);
- } else {
- debug("ignored unaccepted stream %.16s(%.16s) from %.20s", type2str(ps.type),
- ((ps.args == NULL) ? "0" : ps.args), source->addr);
- }
- }
- /*
- * packet = parsed and in ascii in shared region -> copy to
- * clients
- */
- snprintf(stringptr, maxstringlen, "\n");
- stringptr += strlen(stringptr);
- shared_setlen((stringptr - stringbuf));
- debug("churnbuffer used: %d", (stringptr - stringbuf));
- master_permitread();
- } /* flag_hup == 0 */
- } /* forever */
- /* NOT REACHED */
- return (EX_SOFTWARE);
- }
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