/*
* Copyright (C) 2013-2019 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 "shared/optparser.h"
#include "shared/output.h"
#include "shared/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:
*/