/*
* Copyright (C) 2013-2020 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2008-2013 Sourcefire, Inc.
*
* Author: aCaB <acab@clamav.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>
#include <time.h>
#include <netdb.h>
#include "optparser.h"
#include "output.h"
#include "misc.h"
#include "connpool.h"
#include "netcode.h"
#define SETGAI(k, v) \
{ \
(k)->gai = (void *)(v); \
} \
while (0)
#define FREESRV(k) \
{ \
if ((k).gai) \
freeaddrinfo((k).gai); \
else if ((k).server) \
free((k).server); \
} \
while (0)
#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
#define _UNUSED_ __attribute__((__unused__))
#else
#define _UNUSED_
#endif
struct CPOOL *cp = NULL;
static pthread_cond_t mon_cond = PTHREAD_COND_INITIALIZER;
static int quitting = 1;
static pthread_t probe_th;
static int cpool_addunix(char *path)
{
struct sockaddr_un *srv;
struct CP_ENTRY *cpe = &cp->pool[cp->entries - 1];
if (!cli_is_abspath(path)) {
logg("!Unix clamd socket must be an absolute path\n");
return 1;
}
if (!(srv = (struct sockaddr_un *)malloc(sizeof(*srv)))) {
logg("!Out of memory allocating unix socket space\n");
return 1;
}
srv->sun_family = AF_UNIX;
strncpy(srv->sun_path, path, sizeof(srv->sun_path));
srv->sun_path[sizeof(srv->sun_path) - 1] = '\0';
cpe->type = 0;
cpe->dead = 1;
cpe->local = 1;
cpe->last_poll = 0;
cpe->server = (struct sockaddr *)srv;
cpe->socklen = sizeof(*srv);
SETGAI(cpe, NULL);
if (!cp->local_cpe) cp->local_cpe = cpe;
logg("*Local socket unix:%s added to the pool (slot %d)\n", srv->sun_path, cp->entries);
return 0;
}
static int islocal(struct sockaddr *sa, socklen_t addrlen)
{
int s = socket(sa->sa_family, SOCK_STREAM, 0);
int ret;
if (s < 0) return 0;
ret = (bind(s, sa, addrlen) == 0);
close(s);
return ret;
}
static int cpool_addtcp(char *addr, char *port)
{
struct addrinfo hints, *res, *res2;
struct CP_ENTRY *cpe = (struct CP_ENTRY *)&cp->pool[cp->entries - 1];
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(addr, port ? port : "3310", &hints, &res)) {
logg("^Can't resolve hostname %s\n", addr ? addr : "");
return 1;
}
cpe->type = 1;
cpe->dead = 1;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = AF_UNSPEC;
if (!getaddrinfo(addr, NULL, &hints, &res2)) {
cpe->local = islocal(res2->ai_addr, res2->ai_addrlen);
freeaddrinfo(res2);
} else
cpe->local = 0;
cpe->last_poll = 0;
cpe->server = res->ai_addr;
cpe->socklen = res->ai_addrlen;
SETGAI(cpe, res);
logg("*%s socket tcp:%s:%s added to the pool (slot %d)\n", cpe->local ? "Local" : "Remote", addr ? addr : "localhost", port ? port : "3310", cp->entries);
return 0;
}
static int addslot(void)
{
struct CP_ENTRY *cpe;
if (!(cpe = realloc(cp->pool, (cp->entries + 1) * sizeof(struct CP_ENTRY)))) {
logg("!Out of memory while initializing the connection pool\n");
cpool_free();
return 1;
}
if (cp->local_cpe)
cp->local_cpe = (struct CP_ENTRY *)((char *)cp->local_cpe + ((char *)cpe - (char *)cp->pool));
memset(&cpe[cp->entries], 0, sizeof(*cpe));
cp->pool = cpe;
cp->entries++;
return 0;
}
/* Probe strategy:
- wake up every minute
- probe alive if last check > 15 min
- probe dead if (last check > 2 min || no clamd available)
*/
static void cpool_probe(void)
{
unsigned int i, dead = 0;
struct CP_ENTRY *cpe = cp->pool;
time_t now = time(NULL);
for (i = 1; i <= cp->entries; i++) {
if ((cpe->dead && (cpe->last_poll < now - 120 || !cp->alive)) || cpe->last_poll < now - 15 * 60 * 60) {
cpe->last_poll = time(NULL);
nc_ping_entry(cpe);
logg("*Probe for slot %u returned: %s\n", i, cpe->dead ? "failed" : "success");
}
dead += cpe->dead;
cpe++;
}
cp->alive = cp->entries - dead;
if (!cp->alive)
logg("^No clamd server appears to be available\n");
}
static void *cpool_mon(_UNUSED_ void *v)
{
pthread_mutex_t conv;
pthread_mutex_init(&conv, NULL);
pthread_mutex_lock(&conv);
while (!quitting) {
struct timespec t;
cpool_probe();
t.tv_sec = time(NULL) + 60;
t.tv_nsec = 0;
pthread_cond_timedwait(&mon_cond, &conv, &t);
}
pthread_mutex_unlock(&conv);
pthread_mutex_destroy(&conv);
return NULL;
}
void cpool_init(struct optstruct *opts)
{
const struct optstruct *opt;
int failed = 0;
if (!(cp = calloc(sizeof(*cp), 1))) {
logg("!Out of memory while initializing the connection pool");
return;
}
cp->local_cpe = NULL;
if ((opt = optget(opts, "ClamdSocket"))->enabled) {
while (opt) {
char *socktype = opt->strarg;
if (addslot()) return;
if (!strncasecmp(socktype, "unix:", 5)) {
failed = cpool_addunix(socktype + 5);
} else if (!strncasecmp(socktype, "tcp:", 4)) {
char *port = strrchr(socktype + 4, ':');
if (port) {
*port = '\0';
port++;
}
failed = cpool_addtcp(socktype + 4, port);
} else {
logg("!Failed to parse ClamdSocket directive '%s'\n", socktype);
failed = 1;
}
if (failed) break;
opt = opt->nextarg;
}
if (failed) {
cpool_free();
return;
}
}
if (!cp->entries) {
logg("!No ClamdSocket specified\n");
cpool_free();
return;
}
quitting = 0;
pthread_create(&probe_th, NULL, cpool_mon, NULL);
srand(time(NULL));
}
void cpool_free(void)
{
unsigned int i;
if (!quitting) {
logg("*Killing the monitor and stopping\n");
quitting = 1;
pthread_cond_signal(&mon_cond);
pthread_join(probe_th, NULL);
}
if (cp) {
if (cp->pool) {
for (i = 0; i < cp->entries; i++)
FREESRV(cp->pool[i]);
free(cp->pool);
}
free(cp);
cp = NULL;
}
}
struct CP_ENTRY *cpool_get_rand(int *s)
{
unsigned int start, i;
struct CP_ENTRY *cpe;
if (cp->alive) {
start = rand() % cp->entries;
for (i = 0; i < cp->entries; i++) {
cpe = &cp->pool[(i + start) % cp->entries];
if (cpe->dead) continue;
if (cpe->local && cp->local_cpe && !cp->local_cpe->dead)
cpe = cp->local_cpe;
if ((*s = nc_connect_entry(cpe)) == -1) {
cpe->dead = 1;
continue;
}
return cpe;
}
}
pthread_cond_signal(&mon_cond);
return NULL;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* tab-width: 8
* End:
* vim: set cindent smartindent autoindent softtabstop=4 shiftwidth=4 tabstop=8:
*/