router.h

/*
 * Copyright 2013-2024 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.
 */


#ifndef ROUTER_H
#define ROUTER_H 1

#include <stdio.h>
#include <time.h>

#include "relay.h"
#include "server.h"
#include "aggregator.h"
#include "posixregex.h"

#ifdef HAVE_SSL
#include <openssl/ssl.h>
#endif

#define PMODE_NORM    (1 << 0)
#define PMODE_AGGR    (1 << 1)
#define PMODE_HASH    (1 << 2)
#define PMODE_STUB    (1 << 3)
#define PMODE_PEMT    (1 << 4)
#define PMODE_DEBUG   (PMODE_HASH | PMODE_STUB)

#define CONN_DESTS_SIZE    128

#ifndef TMPDIR
# define TMPDIR "/tmp"
#endif

#define SOCKFILE ".s.carbon-c-relay"

typedef struct {
	const char *metric;
	server *dest;
} destination;

/* ensure we always define the protovers such that the parser can
 * reference them, even though they will never get used */
#ifdef HAVE_SSL
# define TLSVER(S,V) S = V
# ifndef SSL3_VERSION
#  define SSL3_VERSION   0x0300
# endif
# ifndef TLS1_3_VERSION
#  define TLS1_3_VERSION 0x0304
# endif
#else
# define TLSVER(S,V) S
#endif
typedef enum _router_tlsprotover {
	       _rp_UNSET = 0,
	TLSVER(_rp_SSL3,   SSL3_VERSION),
	TLSVER(_rp_TLS1_0, TLS1_VERSION),
	TLSVER(_rp_TLS1_1, TLS1_1_VERSION),
	TLSVER(_rp_TLS1_2, TLS1_2_VERSION),
	TLSVER(_rp_TLS1_3, TLS1_3_VERSION)
} tlsprotover;
#undef TLSVER

typedef struct _router_listener {
	con_type lsnrtype;
	con_trnsp transport;
	con_proto ctype;
	char *ip;
	unsigned short port;
	int *socks;
#ifdef HAVE_SSL
	SSL_CTX *ctx;
	SSL **sslstrms;
	char *pemcert;
	tlsprotover protomin;
	tlsprotover protomax;
	char *ciphers;
	char *ciphersuites;
	struct timespec pemmtimespec;
#endif
	struct addrinfo *saddrs;
	struct _router_listener *next;
} listener;

typedef struct _router router;
typedef enum { SUB, CUM } col_mode;

#define RE_MAX_MATCHES     64

router *router_readconfig(router *orig, const char *path, char workercnt, size_t queuesize, size_t batchsize, int maxstalls, unsigned short iotimeout, unsigned int sockbufsize, unsigned short port);
void router_optimise(router *r, int threshold);
char router_printdiffs(router *old, router *new, FILE *out);
listener *router_contains_listener(router *rtr, listener *lsnr);
void router_transplant_queues(router *new, router *old);
void router_reopen_files(router *rtr);
void router_transplant_listener_socks(router *rtr, listener *olsnr, listener *nlsnr);
char router_start(router *r);
size_t router_rewrite_metric(char (*newmetric)[METRIC_BUFSIZ], char **newfirstspace, const char *metric, const char *firstspace, const char *replacement, const size_t nmatch, const regmatch_t *pmatch);
void router_printconfig(router *r, FILE *f, char mode);
char router_route(router *r, destination ret[], size_t *retcnt, size_t retsize, char *srcaddr, char *metric, char *firstspace, int dispatcher_id);
void router_test(router *r, char *metric_path);
listener *router_get_listeners(router *r);
server **router_getservers(router *r);
aggregator *router_getaggregators(router *r);
char *router_getcollectorstub(router *r);
int router_getcollectorinterval(router *r);
char *router_getcollectorprefix(router *r);
col_mode router_getcollectormode(router *r);
void router_shutdown(router *r);
void router_free(router *r);

#endif