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relay.c
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relay.c
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/*
* Copyright 2013-2022 Fabian Groffen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <time.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <errno.h>
#include <assert.h>
#if defined(__MACH__) || defined(BSD)
# include <sys/types.h>
# include <sys/sysctl.h>
#endif
#include "relay.h"
#include "server.h"
#include "router.h"
#include "receptor.h"
#include "dispatcher.h"
#include "aggregator.h"
#include "collector.h"
#include "conffile.h"
#include "posixregex.h"
unsigned char keep_running = 1;
int pending_signal = -1;
char relay_hostname[256];
unsigned char mode = 0;
char noexpire = 0;
#ifdef HAVE_SSL
char *sslCA = NULL;
char sslCAisdir = 0;
#endif
static char *config = NULL;
static int batchsize = 2500;
static int queuesize = 25000;
static int maxstalls = 4;
static unsigned short iotimeout = 600;
static unsigned short listenport = GRAPHITE_PORT;
static int optimiserthreshold = 50;
static int sockbufsize = 0;
static int collector_interval = 60;
static unsigned int listenbacklog = 32;
static dispatcher **workers = NULL;
static char workercnt = 0;
static router *rtr = NULL;
static server *internal_submission = NULL;
static char *relay_logfile = NULL;
static FILE *relay_stdout = NULL;
static FILE *relay_stderr = NULL;
static char relay_can_log = 0;
#ifdef YYDEBUG
extern int router_yydebug;
#endif
/**
* Writes to the setup output stream, prefixed with a timestamp, and if
* the stream is not going to stdout or stderr, prefixed with MSG or
* ERR.
*/
int
relaylog(enum logdst dest, const char *fmt, ...)
{
va_list ap;
char prefix[64];
size_t len;
time_t now;
struct tm tm_now;
FILE *dst = NULL;
char console = 0;
int ret;
/* briefly stall if we're swapping fds */
while (!__sync_add_and_fetch(&relay_can_log, 0))
usleep((100 + (rand() % 200)) * 1000); /* 100ms - 300ms */
switch (dest) {
case LOGOUT:
dst = relay_stdout;
if (dst == stdout)
console = 1;
break;
case LOGERR:
dst = relay_stderr;
if (dst == stderr)
console = 1;
break;
}
/* NULL == /dev/null */
if (dst == NULL)
return 0;
time(&now);
localtime_r(&now, &tm_now);
len = strftime(prefix, sizeof(prefix), "[%Y-%m-%d %H:%M:%S]", &tm_now);
if (!console)
(void)snprintf(prefix + len, sizeof(prefix) - len,
" (%s)", dest == LOGOUT ? "MSG" : "ERR");
fprintf(dst, "%s ", prefix);
va_start(ap, fmt);
ret = vfprintf(dst, fmt, ap);
fflush(dst);
va_end(ap);
return ret;
}
static void
sig_handler(int sig)
{
/* a thunder of signals will be ignored for as long as a pending
* signal was set, I can live with that, feels like a bad practice
* to bombard a process like that */
(void)__sync_bool_compare_and_swap(&pending_signal, -1, sig);
}
static void
do_reload(void)
{
router *newrtr;
aggregator *newaggrs;
int id;
FILE *newfd;
size_t numaggregators;
listener *lsnrs;
if (relay_stderr != stderr) {
/* try to re-open the file first, so we can still try and say
* something if that fails */
if ((newfd = fopen(relay_logfile, "a")) == NULL) {
logerr("not reopening logfiles: can't open '%s': %s\n",
relay_logfile, strerror(errno));
} else {
logout("closing logfile\n");
__sync_and_and_fetch(&relay_can_log, 0);
/* lame race avoidance for relaylog() usage */
usleep((100 + (rand() % 200)) * 1000); /* 100ms - 300ms */
fclose(relay_stderr);
relay_stdout = newfd;
relay_stderr = newfd;
__sync_bool_compare_and_swap(&relay_can_log, 0, 1);
logout("reopening logfile\n");
}
}
logout("reloading config from '%s'\n", config);
if ((newrtr = router_readconfig(NULL, config, workercnt,
queuesize, batchsize, maxstalls,
iotimeout, sockbufsize, listenport)) == NULL)
{
logerr("failed to read configuration '%s', aborting reload\n", config);
return;
}
router_optimise(newrtr, optimiserthreshold);
/* compare the configs first, if there is no diff, then
* just refrain from reloading anything */
if (!router_printdiffs(rtr, newrtr, relay_stdout)) {
/* no changes, shortcut */
logout("no config changes found\n");
router_free(newrtr);
logout("SIGHUP handler complete\n");
return;
}
/* close connections that are not in the new config first */
lsnrs = router_get_listeners(rtr);
for ( ; lsnrs != NULL; lsnrs = lsnrs->next) {
if (router_contains_listener(newrtr, lsnrs) == NULL) {
dispatch_removelistener(lsnrs);
}
}
logout("reloading collector\n");
collector_schedulereload(newrtr);
while (!collector_reloadcomplete())
usleep((100 + (rand() % 200)) * 1000); /* 100ms - 300ms */
/* During aggregator final expiry, the dispatchers should not put
* new metrics, so we have to temporarily stop them processing
* connections. However, we still need to handle aggregations that
* we will stop next, so this call results in the dispatchers only
* dealing with connections from aggregators. Doing this, also
* means that we can reload the config atomicly, which disrupts the
* service seemingly for a bit, but results in less confusing output
* in the end. */
logout("interrupting workers\n");
for (id = 1; id < 1 + workercnt; id++)
dispatch_hold(workers[id]);
numaggregators = aggregator_numaggregators(router_getaggregators(rtr));
if (numaggregators > 0) {
logout("expiring aggregations\n");
aggregator_stop(); /* frees aggrs */
/* Now the aggregator has written everything to the
* dispatchers, which will hand over to the servers with proper
* metric adjustments (stubs). */
}
newaggrs = router_getaggregators(newrtr);
numaggregators = aggregator_numaggregators(newaggrs);
if (numaggregators > 0) {
if (!aggregator_start(newaggrs)) {
logerr("failed to start aggregator, aggregations will no "
"longer produce output!\n");
}
}
/* Transplant listeners so their open state won't get lost. Open up
* connections for new listeners. */
lsnrs = router_get_listeners(newrtr);
for ( ; lsnrs != NULL; lsnrs = lsnrs->next) {
listener *olsnr;
if ((olsnr = router_contains_listener(rtr, lsnrs)) != NULL) {
/* ensure we copy over the opened sockets/state */
dispatch_transplantlistener(olsnr, lsnrs, newrtr);
} else {
if (bindlisten(lsnrs, listenbacklog) != 0) {
logerr("failed to setup listener, "
"this will impact the behaviour of the relay\n");
continue;
}
if (dispatch_addlistener(lsnrs) != 0) {
logerr("failed to listen to socket, the "
"listener will not be effective\n");
}
}
}
/* Transplant the queues for the same servers, so we keep their
* queues (potentially with data) around. To do so, we need to make
* sure the servers aren't being operated on. */
router_shutdown(rtr);
/* Because we know that ip:port:prot is unique in both sets, when we
* find a match, we can just swap the queue. This comes with a
* slight peculiarity, that if a server becomes part of an any_of
* cluster (or failover), its pending queue can now be processed by
* other servers. While this feels wrong, it can be extremely
* useful in case existing data needs to be migrated to another
* server, e.g. the config on purpose added a failover to offload a
* known dead server before removing it. This is fairly specific
* but in reality this happens to be desirable every once so often. */
router_transplant_queues(newrtr, rtr);
/* Before we start the workers sending traffic, start up the
* servers now queues are transplanted. */
router_start(newrtr);
logout("reloading workers\n");
for (id = 1; id < 1 + workercnt; id++)
dispatch_schedulereload(workers[id], newrtr); /* un-holds */
for (id = 1; id < 1 + workercnt; id++) {
while (!dispatch_reloadcomplete(workers[id + 0]))
usleep((100 + (rand() % 200)) * 1000); /* 100ms - 300ms */
}
router_free(rtr);
rtr = newrtr;
logout("SIGHUP handler complete\n");
}
static void
handle_signal(int sig)
{
char *sign = "unknown signal";
switch (sig) {
case SIGTERM:
sign = "SIGTERM";
break;
case SIGINT:
sign = "SIGINT";
break;
case SIGQUIT:
sign = "SIGQUIT";
break;
case SIGHUP:
sign = "SIGHUP";
break;
case SIGUSR1:
sign = "SIGUSR1";
break;
}
if (keep_running) {
logout("caught %s\n", sign);
} else {
/* also fine when SIGHUP */
logerr("caught %s while already shutting down, "
"forcing exit!\n", sign);
exit(1);
}
if (sig == SIGHUP) {
do_reload();
} else if (sig == SIGUSR1) {
if (mode & MODE_DEBUG) {
mode &= ~MODE_DEBUG;
} else {
mode |= MODE_DEBUG;
}
} else {
keep_running = 0;
}
}
static int
get_cores(void)
{
int cpus = 5;
#if defined(__MACH__) || defined(BSD)
size_t len = sizeof(cpus);
sysctlbyname("hw.ncpu", &cpus, &len, NULL, 0);
#else /* Linux and Solaris */
cpus = sysconf(_SC_NPROCESSORS_ONLN);
#endif
return cpus;
}
static void
do_version(void)
{
printf("carbon-c-relay v" VERSION " (" GIT_VERSION ")\n");
#if defined(HAVE_GZIP) || defined(HAVE_LZ4) || defined(HAVE_SNAPPY) || defined(HAVE_SSL)
printf("enabled support for:");
#endif
#ifdef HAVE_GZIP
printf(" gzip");
#endif
#ifdef HAVE_LZ4
printf(" lz4");
#endif
#ifdef HAVE_SNAPPY
printf(" snappy");
#endif
#ifdef HAVE_SSL
printf(" ssl");
#endif
printf("\n");
printf("regular expressions library:");
#if defined(HAVE_ONIGURAMA)
printf(" oniguruma");
#elif defined (HAVE_PCRE2)
printf(" PCRE2");
#elif defined (HAVE_PCRE)
printf(" PCRE");
#else
printf(" libc");
#endif
printf("\n");
exit(0);
}
static void
do_usage(char *name, int exitcode)
{
printf("Usage: %s -f <config> [opts]\n", name);
printf("\n");
printf("Options:\n");
printf(" -v print version and exit\n");
printf(" -f read <config> for clusters and routes\n");
printf(" -p listen on <port> for connections, defaults to %u\n",
GRAPHITE_PORT);
printf(" -l write output to <file>, defaults to stdout/stderr\n");
printf(" -w use <workers> worker threads, defaults to %d\n", get_cores());
printf(" -b server send batch size, defaults to %d\n", batchsize);
printf(" -q server queue size, defaults to %d\n", queuesize);
printf(" -L server max stalls, defaults to %d\n", maxstalls);
#ifdef HAVE_SSL
printf(" -C use CA <cert> to verify outgoing SSL connections or\n");
printf(" incoming mTLS connections\n");
#endif
printf(" -B connection listen backlog, defaults to 32\n");
printf(" -U socket receive buffer size, max/min/default values depend on OS\n");
printf(" -T IO timeout in milliseconds for server connections, defaults to %d\n", iotimeout);
printf(" -E disable disconnecting idle connections after 10 minutes\n");
printf(" -c characters to allow next to [A-Za-z0-9], defaults to -_:#\n");
printf(" -m max string length of metric, defaults to 0, limit of -M\n");
printf(" -M max string length of metric+ts+value+nl, defaults to %d\n",
METRIC_BUFSIZ);
printf(" -d debug mode: currently writes statistics to log, prints hash\n"
" ring contents and matching position in test mode (-t)\n");
#ifdef ENABLE_TRACE
printf(" add another -d to enable (very noisy) trace mode\n");
#endif
printf(" -s submission mode: don't add any metrics to the stream like\n"
" statistics, report drop counts and queue pressure to log\n");
printf(" -S implies submission mode, print iostat-like statistics\n");
printf(" -t config test mode: prints rule matches from input on stdin\n");
printf(" -H hostname: override hostname (used in statistics)\n");
printf(" -D daemonise: detach and run in background\n");
printf(" -P pidfile: write a pid to a specified pidfile\n");
printf(" -O minimum number of rules before optimising the ruleset, "
"default: %d\n", optimiserthreshold);
exit(exitcode);
}
int
main(int argc, char * const argv[])
{
char id;
int ch;
size_t numaggregators;
char *allowed_chars = NULL;
char *pidfile = NULL;
FILE *pidfile_handle = NULL;
aggregator *aggrs = NULL;
int fds[2];
unsigned char startup_success = 0;
listener *lsnrs;
int maxmetriclen = -1;
int maxinplen = -1;
if (gethostname(relay_hostname, sizeof(relay_hostname)) < 0)
snprintf(relay_hostname, sizeof(relay_hostname), "127.0.0.1");
while ((ch = getopt(argc, argv,
":hvdsStf:l:p:w:b:q:L:C:T:c:m:M:H:B:U:EDP:O:")) != -1)
{
switch (ch) {
case 'v':
do_version();
break;
case 'd':
/* secret support for -dd (just trace) and -ddd (debug
* and trace) */
if (mode & MODE_DEBUG) {
mode |= MODE_TRACE;
mode &= ~MODE_DEBUG;
} else {
mode |= MODE_DEBUG;
}
break;
case 's':
mode |= MODE_SUBMISSION;
break;
case 'S':
mode |= MODE_SUBMISSION | MODE_METRICSTAT;
break;
case 't':
/* -t: test interactively, -tt: test config and exit */
if (mode & MODE_TEST) {
mode |= MODE_CONFIGTEST;
} else {
mode |= MODE_TEST;
}
break;
case 'f':
config = optarg;
break;
case 'l':
relay_logfile = optarg;
break;
case 'p':
listenport = (unsigned short)atoi(optarg);
if (listenport == 0) {
fprintf(stderr, "error: port needs to be a number >0\n");
do_usage(argv[0], 1);
}
break;
case 'w':
workercnt = (char)atoi(optarg);
if (workercnt <= 0) {
fprintf(stderr, "error: workers needs to be a number >0\n");
do_usage(argv[0], 1);
}
break;
case 'b':
batchsize = atoi(optarg);
if (batchsize <= 0) {
fprintf(stderr, "error: batch size needs to be a number >0\n");
do_usage(argv[0], 1);
}
break;
case 'q':
queuesize = atoi(optarg);
if (queuesize <= 0) {
fprintf(stderr, "error: queue size needs to be a number >0\n");
do_usage(argv[0], 1);
}
break;
case 'L':
maxstalls = atoi(optarg);
if (maxstalls < 0 || maxstalls >= (1 << SERVER_STALL_BITS) ||
!isdigit(*optarg))
{
fprintf(stderr, "error: maximum stalls needs to be a number "
"between 0 and %d\n", (1 << SERVER_STALL_BITS) - 1);
do_usage(argv[0], 1);
}
break;
case 'C':
#ifdef HAVE_SSL
sslCA = optarg;
#endif
break;
case 'T': {
int val = atoi(optarg);
if (val <= 0) {
fprintf(stderr, "error: server IO timeout needs "
"to be a number >0\n");
do_usage(argv[0], 1);
} else if (val >= 60000) {
fprintf(stderr, "error: server IO timeout needs "
"to be less than one minute\n");
do_usage(argv[0], 1);
}
iotimeout = (unsigned short)val;
} break;
case 'E':
noexpire = 1;
break;
case 'c':
allowed_chars = optarg;
break;
case 'm': {
int val = atoi(optarg);
if (val < 0 || !isdigit(*optarg)) {
fprintf(stderr, "error: max metric length needs to "
"be a number >=0\n");
do_usage(argv[0], 1);
}
maxmetriclen = val;
} break;
case 'M': {
int val = atoi(optarg);
if (val <= 0) {
fprintf(stderr, "error: max length needs to "
"be a number >0\n");
do_usage(argv[0], 1);
}
if (val > METRIC_BUFSIZ) {
fprintf(stderr, "error: max length cannot be >%d\n",
METRIC_BUFSIZ);
do_usage(argv[0], 1);
}
maxinplen = val;
} break;
case 'H':
snprintf(relay_hostname, sizeof(relay_hostname), "%s", optarg);
break;
case 'B': {
int val = atoi(optarg);
if (val <= 0) {
fprintf(stderr, "error: backlog needs to be a number >0\n");
do_usage(argv[0], 1);
}
listenbacklog = (unsigned int)val;
} break;
case 'U': {
int val = atoi(optarg);
socklen_t len = sizeof(sockbufsize);
int sock;
if (val <= 0) {
fprintf(stderr, "error: bufsize needs to be a number >0\n");
do_usage(argv[0], 1);
}
sockbufsize = (unsigned int)val;
/* test the size to see if the value is valid, since
* this is OS dependant, it's the only way */
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock == -1 || setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
&sockbufsize, sizeof(sockbufsize)) != 0)
{
fprintf(stderr, "failed to set socket bufsize: %s\n",
strerror(errno));
}
if (sock != -1 && getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
&sockbufsize, &len) != 0)
{
fprintf(stderr, "failed to get socket bufsize: %s\n",
strerror(errno));
}
if (len != sizeof(sockbufsize)) {
fprintf(stderr, "getsockopt returned unexpected size: %u, "
"expected %zu\n", len, sizeof(sockbufsize));
exit(1);
}
if (sockbufsize > (unsigned int)val)
fprintf(stderr, "warning: OS rejected socket bufsize\n");
if (sock != -1)
close(sock);
} break;
case 'D':
mode |= MODE_DAEMON;
break;
case 'P':
pidfile = optarg;
break;
case 'O': {
int val = atoi(optarg);
if (val == 0 && !isdigit(*optarg)) {
fprintf(stderr, "error: optimiser threshold needs to "
"be a number\n");
do_usage(argv[0], 1);
}
optimiserthreshold = val < 0 ? -1 : val;
} break;
case '?':
case ':':
do_usage(argv[0], 1);
break;
case 'h':
default:
do_usage(argv[0], 0);
break;
}
}
if (optind == 1 || config == NULL)
do_usage(argv[0], 1);
/* seed randomiser for dispatcher and aggregator "splay" */
srand(time(NULL));
if (workercnt == 0)
workercnt = mode & MODE_SUBMISSION ? 2 : get_cores();
/* disable collector for submission mode */
if (mode & MODE_SUBMISSION && !(mode & MODE_DEBUG))
collector_interval = 0;
/* any_of failover maths need batchsize to be smaller than queuesize */
if (batchsize > queuesize) {
fprintf(stderr, "error: batchsize must be smaller than queuesize\n");
exit(1);
}
/* check bufsizes make sense */
if (maxinplen > 0 && maxmetriclen > 0 && maxmetriclen >= maxinplen)
{
fprintf(stderr, "error: max metric len must be smaller than "
"max length of input string\n");
exit(1);
}
if (maxinplen == -1)
maxinplen = METRIC_BUFSIZ;
if (maxmetriclen == -1)
maxmetriclen = maxinplen; /* never hit the limit */
if (relay_logfile != NULL && (mode & MODE_TEST) == 0) {
FILE *f = fopen(relay_logfile, "a");
if (f == NULL) {
fprintf(stderr, "error: failed to open logfile '%s': %s\n",
relay_logfile, strerror(errno));
exit(1);
}
relay_stdout = f;
relay_stderr = f;
} else if (mode & MODE_CONFIGTEST) {
/* suppress stdout, just show errors */
relay_stdout = NULL;
relay_stderr = stderr;
} else {
relay_stdout = stdout;
relay_stderr = stderr;
}
relay_can_log = 1;
if (mode & MODE_DAEMON) {
if (relay_logfile == NULL) {
fprintf(stderr,
"You must specify logfile if you want daemonisation!\n");
exit(1);
}
if (mode & MODE_TEST) {
fprintf(stderr,
"You cannot use test mode if you want daemonisation!\n");
exit(1);
}
}
if (pidfile != NULL) {
pidfile_handle = fopen(pidfile, "w");
if (pidfile_handle == NULL) {
fprintf(stderr, "failed to open pidfile '%s': %s\n",
pidfile, strerror(errno));
exit(1);
}
}
#ifdef HAVE_SSL
/* check if we can read the given CA before starting up and stuff */
if (sslCA != NULL) {
struct stat st;
if (stat(sslCA, &st) == -1) {
fprintf(stderr, "failed to open TLS/SSL CA file '%s': %s\n",
sslCA, strerror(errno));
exit(1);
}
if (S_ISDIR(st.st_mode))
sslCAisdir = 1;
}
#endif
if (mode & MODE_DAEMON) {
pid_t p;
if (pipe(fds) < 0) {
fprintf(stderr,
"failed to create pipe to talk to child process: %s\n",
strerror(errno));
exit(1);
}
p = fork();
if (p < 0) {
fprintf(stderr, "failed to fork intermediate process: %s\n",
strerror(errno));
exit(1);
} else if (p == 0) {
char msg[1024];
/* child, fork again so our intermediate process can die and
* its child becomes an orphan to init */
p = fork();
if (p < 0) {
snprintf(msg, sizeof(msg),
"failed to fork daemon process: %s\n", strerror(errno));
/* fool compiler */
if (write(fds[1], msg, strlen(msg) + 1) > -2)
exit(1); /* not that retcode matters */
} else if (p == 0) {
/* child, this is the final daemon process */
if (setsid() < 0) {
snprintf(msg, sizeof(msg), "failed to setsid(): %s\n",
strerror(errno));
/* fool compiler */
if (write(fds[1], msg, strlen(msg) + 1) > -2)
exit(1); /* not that retcode matters */
}
/* close descriptors, we won't need them ever since
* we're detached from the controlling terminal */
close(0);
close(1);
close(2);
} else {
/* parent, die */
exit(0);
}
} else {
/* parent: wait for child to report success */
char msg[1024];
int len = read(fds[0], msg, sizeof(msg));
if (len < 0) {
fprintf(stderr, "unable to read from child, "
"assuming daemonisation failed\n");
exit(1);
} else if (len == 0) {
fprintf(stderr, "got unexpected EOF from child, "
"assuming daemonisation failed\n");
exit(1);
} else if (strncmp(msg, "OK", len) == 0) {
/* child is happy, so can we */
exit(0);
} else {
if (len == 1024)
len--;
msg[len] = '\0';
fprintf(stderr, "%s", msg);
exit(1);
}
}
} else {
fds[0] = fds[1] = -1;
}
#define exit_err(...) { \
if (fds[0] != -1) { \
char msg[1024]; \
snprintf(msg, sizeof(msg), __VA_ARGS__); \
/* fool compiler */ \
if (write(fds[1], msg, strlen(msg) + 1) > -2) \
exit(1); /* not that retcode matters */ \
} else { \
logerr(__VA_ARGS__); \
exit(1); \
} \
}
#define exit_ok { \
if (fds[0] != -1) { \
/* we're fine, flag our grandparent (= the original
* process being called) it can terminate */ \
if (write(fds[1], "OK", 3) < -2) \
exit(1); /* if our grantparent died, we better do too */ \
close(fds[0]); \
close(fds[1]); \
} \
fds[0] = fds[1] = -1; \
startup_success = 1; \
}
if (pidfile_handle) {
fprintf(pidfile_handle, "%zu\n", (ssize_t)getpid());
fclose(pidfile_handle);
}
logout("starting carbon-c-relay v%s (%s), pid=%d\n",
VERSION, GIT_VERSION, getpid());
if (relay_stdout != NULL) {
fprintf(relay_stdout, "configuration:\n");
fprintf(relay_stdout, " relay hostname = %s\n", relay_hostname);
fprintf(relay_stdout, " workers = %d\n", workercnt);
fprintf(relay_stdout, " send batch size = %d\n", batchsize);
fprintf(relay_stdout, " server queue size = %d\n", queuesize);
fprintf(relay_stdout, " server max stalls = %d\n", maxstalls);
fprintf(relay_stdout, " listen backlog = %u\n", listenbacklog);
if (sockbufsize > 0)
fprintf(relay_stdout, " socket bufsize = %u\n", sockbufsize);
#ifdef HAVE_SSL
if (sslCA != NULL)
fprintf(relay_stdout, " tls/ssl CA = %s\n", sslCA);
#endif
fprintf(relay_stdout, " server connection IO timeout = %dms\n",
iotimeout);
fprintf(relay_stdout, " idle connections disconnect timeout = %s\n",
noexpire ? "never" : "10m");
if (allowed_chars != NULL)
fprintf(relay_stdout, " extra allowed characters = %s\n",
allowed_chars);
if (maxinplen < METRIC_BUFSIZ)
fprintf(relay_stdout, " max input length = %d\n", maxinplen);
if (maxmetriclen < maxinplen)
fprintf(relay_stdout, " max metric length = %d\n", maxmetriclen);
if (mode & MODE_DEBUG)
fprintf(relay_stdout, " debug = true\n");
#ifdef ENABLE_TRACE
if (mode & MODE_TRACE)
fprintf(relay_stdout, " trace = true\n");
#endif
else if (mode & MODE_SUBMISSION)
fprintf(relay_stdout, " submission = true\n");
else if (mode & MODE_DAEMON)
fprintf(relay_stdout, " daemon = true\n");
fprintf(relay_stdout, " configuration = %s\n", config);
fprintf(relay_stdout, "\n");
}
#ifdef HAVE_SSL
/* this needs to happen once, globally */
SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
#endif
#ifdef YYDEBUG
if (mode & MODE_TRACE)
router_yydebug = 1;
#endif
if ((rtr = router_readconfig(NULL, config, workercnt,
queuesize, batchsize, maxstalls,
iotimeout, sockbufsize, listenport)) == NULL)
{
exit_err("failed to read configuration '%s'\n", config);
}
router_optimise(rtr, optimiserthreshold);
/* we're done if all we wanted was to test the config */
if (mode & MODE_CONFIGTEST)
exit(0);
aggrs = router_getaggregators(rtr);
numaggregators = aggregator_numaggregators(aggrs);
if (numaggregators > 10 && !(mode & MODE_DEBUG)) {
fprintf(relay_stdout, "parsed configuration follows:\n"
"(%zu aggregations with %zu computations omitted "
"for brevity)\n",
numaggregators, aggregator_numcomputes(aggrs));
router_printconfig(rtr, relay_stdout, PMODE_NORM);
} else {
fprintf(relay_stdout, "parsed configuration follows:\n");
router_printconfig(rtr, relay_stdout,
PMODE_AGGR + (mode & MODE_DEBUG ?
PMODE_DEBUG | PMODE_PEMT : PMODE_NORM));
}
fprintf(relay_stdout, "\n");
/* shortcut for rule testing mode */
if (mode & MODE_TEST) {
char metricbuf[METRIC_BUFSIZ];
char *p;
fflush(relay_stdout);
while (fgets(metricbuf, sizeof(metricbuf), stdin) != NULL) {
if ((p = strchr(metricbuf, '\n')) != NULL)
*p = '\0';
p = metricbuf;
while (isspace(*p))
p++;
if (*p == '\0')
continue;
router_test(rtr, metricbuf);
}
exit(0);
}
if (signal(SIGINT, sig_handler) == SIG_ERR) {
exit_err("failed to create SIGINT handler: %s\n", strerror(errno));
}
if (signal(SIGTERM, sig_handler) == SIG_ERR) {
exit_err("failed to create SIGTERM handler: %s\n", strerror(errno));
}
if (signal(SIGQUIT, sig_handler) == SIG_ERR) {
exit_err("failed to create SIGQUIT handler: %s\n", strerror(errno));
}
if (signal(SIGHUP, sig_handler) == SIG_ERR) {
exit_err("failed to create SIGHUP handler: %s\n", strerror(errno));
}
if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
exit_err("failed to create SIGUSR1 handler: %s\n", strerror(errno));
}
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
exit_err("failed to ignore SIGPIPE: %s\n", strerror(errno));
}
workers = malloc(sizeof(dispatcher *) *
(1/*lsnr*/ + workercnt + 1/*sentinel*/));
if (workers == NULL) {
exit_err("failed to allocate memory for workers\n");
}
dispatch_set_bufsize(sockbufsize);
if (dispatch_init_listeners() != 0) {
exit_err("failed to allocate listeners\n");
}
lsnrs = router_get_listeners(rtr);
for ( ; lsnrs != NULL; lsnrs = lsnrs->next) {
if (bindlisten(lsnrs, listenbacklog) != 0) {
exit_err("failed to setup listener\n");
}
if (dispatch_addlistener(lsnrs) != 0) {
exit_err("failed to add listener\n");
}
}
/* ensure the listener id is at the end for regex_t array hack */
if ((workers[0] = dispatch_new_listener((unsigned char)workercnt)) == NULL)
logerr("failed to add listener dispatcher\n");
if (allowed_chars == NULL)
allowed_chars = "-_:#";
logout("starting %d workers\n", workercnt);
for (id = 0; id < workercnt; id++) {
workers[id + 1] = dispatch_new_connection(
(unsigned char)id, rtr, allowed_chars,
maxinplen, maxmetriclen);
if (workers[id + 1] == NULL) {
logerr("failed to add worker %d\n", id);
break;
}
}
workers[id + 1] = NULL; /* sentinel */
if (id < workercnt) {
logerr("shutting down due to errors\n");
keep_running = 0;
}
/* server used for delivering metrics produced inside the relay,
* that is, the collector (statistics) */
if ((internal_submission = server_new(
"internal", listenport, T_LINEMODE, W_PLAIN,