/*
* Copyright (C) 2007-2009 Sourcefire, Inc.
*
* Authors: Tomasz Kojm, Trog, Török Edvin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <pthread.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <arpa/inet.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#ifdef C_SOLARIS
#include <stdio_ext.h>
#endif
#include "libclamav/clamav.h"
#include "shared/output.h"
#include "shared/optparser.h"
#include "server.h"
#include "thrmgr.h"
#include "session.h"
#include "clamuko.h"
#include "others.h"
#include "shared.h"
#include "libclamav/others.h"
#include "libclamav/readdb.h"
#include "libclamav/cltypes.h"
#define BUFFSIZE 1024
int progexit = 0;
pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
int reload = 0;
time_t reloaded_time = 0;
pthread_mutex_t reload_mutex = PTHREAD_MUTEX_INITIALIZER;
int sighup = 0;
static struct cl_stat dbstat;
void *event_wake_recv = NULL;
void *event_wake_accept = NULL;
static void scanner_thread(void *arg)
{
client_conn_t *conn = (client_conn_t *) arg;
#ifndef _WIN32
sigset_t sigset;
#endif
int ret;
int virus=0, errors = 0;
#ifndef _WIN32
/* ignore all signals */
sigfillset(&sigset);
/* The behavior of a process is undefined after it ignores a
* SIGFPE, SIGILL, SIGSEGV, or SIGBUS signal */
sigdelset(&sigset, SIGFPE);
sigdelset(&sigset, SIGILL);
sigdelset(&sigset, SIGSEGV);
#ifdef SIGBUS
sigdelset(&sigset, SIGBUS);
#endif
sigdelset(&sigset, SIGTSTP);
sigdelset(&sigset, SIGCONT);
pthread_sigmask(SIG_SETMASK, &sigset, NULL);
#endif
ret = command(conn, &virus);
if (ret == -1) {
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
errors = 1;
} else
errors = ret;
thrmgr_setactiveengine(NULL);
if (conn->filename)
free(conn->filename);
logg("$Finished scanthread\n");
if (thrmgr_group_finished(conn->group, virus ? EXIT_OTHER :
errors ? EXIT_ERROR : EXIT_OK)) {
logg("$Scanthread: connection shut down (FD %d)\n", conn->sd);
/* close connection if we were last in group */
shutdown(conn->sd, 2);
closesocket(conn->sd);
}
cl_engine_free(conn->engine);
free(conn);
return;
}
static int syncpipe_wake_recv_w = -1;
void sighandler_th(int sig)
{
int action = 0;
switch(sig) {
case SIGINT:
case SIGTERM:
progexit = 1;
action = 1;
break;
#ifdef SIGHUP
case SIGHUP:
sighup = 1;
action = 1;
break;
#endif
#ifdef SIGUSR2
case SIGUSR2:
reload = 1;
action = 1;
break;
#endif
default:
break; /* Take no action on other signals - e.g. SIGPIPE */
}
/* a signal doesn't always wake poll(), for example on FreeBSD */
if (action && syncpipe_wake_recv_w != -1)
if (write(syncpipe_wake_recv_w, "", 1) != 1)
logg("$Failed to write to syncpipe\n");
}
static struct cl_engine *reload_db(struct cl_engine *engine, unsigned int dboptions, const struct optstruct *opts, int do_check, int *ret)
{
const char *dbdir;
int retval;
unsigned int sigs = 0;
struct cl_settings *settings = NULL;
*ret = 0;
if(do_check) {
if(!dbstat.entries) {
logg("No stats for Database check - forcing reload\n");
return engine;
}
if(cl_statchkdir(&dbstat) == 1) {
logg("SelfCheck: Database modification detected. Forcing reload.\n");
return engine;
} else {
logg("SelfCheck: Database status OK.\n");
return NULL;
}
}
/* release old structure */
if(engine) {
/* copy current settings */
settings = cl_engine_settings_copy(engine);
if(!settings)
logg("^Can't make a copy of the current engine settings\n");
thrmgr_setactiveengine(NULL);
cl_engine_free(engine);
}
dbdir = optget(opts, "DatabaseDirectory")->strarg;
logg("Reading databases from %s\n", dbdir);
if(dbstat.entries)
cl_statfree(&dbstat);
memset(&dbstat, 0, sizeof(struct cl_stat));
if((retval = cl_statinidir(dbdir, &dbstat))) {
logg("!cl_statinidir() failed: %s\n", cl_strerror(retval));
*ret = 1;
if(settings)
cl_engine_settings_free(settings);
return NULL;
}
if(!(engine = cl_engine_new())) {
logg("!Can't initialize antivirus engine\n");
*ret = 1;
if(settings)
cl_engine_settings_free(settings);
return NULL;
}
if(settings) {
retval = cl_engine_settings_apply(engine, settings);
if(retval != CL_SUCCESS) {
logg("^Can't apply previous engine settings: %s\n", cl_strerror(retval));
logg("^Using default engine settings\n");
}
cl_engine_settings_free(settings);
}
if((retval = cl_load(dbdir, engine, &sigs, dboptions))) {
logg("!reload db failed: %s\n", cl_strerror(retval));
cl_engine_free(engine);
*ret = 1;
return NULL;
}
if((retval = cl_engine_compile(engine)) != 0) {
logg("!Database initialization error: can't compile engine: %s\n", cl_strerror(retval));
cl_engine_free(engine);
*ret = 1;
return NULL;
}
logg("Database correctly reloaded (%u signatures)\n", sigs);
thrmgr_setactiveengine(engine);
return engine;
}
/*
* zCOMMANDS are delimited by \0
* nCOMMANDS are delimited by \n
* Old-style non-prefixed commands are one packet, optionally delimited by \n,
* with trailing \r|\n ignored
*/
static const char *get_cmd(struct fd_buf *buf, size_t off, size_t *len, char *term, int *oldstyle)
{
char *pos;
if (!buf->off || off >= buf->off) {
*len = 0;
return NULL;
}
*term = '\n';
switch (buf->buffer[off]) {
/* commands terminated by delimiters */
case 'z':
*term = '\0';
case 'n':
pos = memchr(buf->buffer + off, *term, buf->off - off);
if (!pos) {
/* we don't have another full command yet */
*len = 0;
return NULL;
}
*pos = '\0';
if (*term) {
*len = cli_chomp(buf->buffer + off);
} else {
*len = pos - buf->buffer - off;
}
*oldstyle = 0;
return buf->buffer + off + 1;
default:
/* one packet = one command */
if (off)
return NULL;
pos = memchr(buf->buffer, '\n', buf->off);
if (pos) {
*len = pos - buf->buffer;
*pos = '\0';
} else {
*len = buf->off;
buf->buffer[buf->off] = '\0';
}
cli_chomp(buf->buffer);
*oldstyle = 1;
return buf->buffer;
}
}
struct acceptdata {
struct fd_data fds;
struct fd_data recv_fds;
pthread_cond_t cond_nfds;
int max_queue;
int commandtimeout;
int syncpipe_wake_recv[2];
int syncpipe_wake_accept[2];
};
#define ACCEPTDATA_INIT(mutex1, mutex2) { FDS_INIT(mutex1), FDS_INIT(mutex2), PTHREAD_COND_INITIALIZER, 0, 0, {-1, -1}, {-1, -1}}
static void *acceptloop_th(void *arg)
{
char buff[BUFFSIZE + 1];
size_t i;
struct acceptdata *data = (struct acceptdata*)arg;
struct fd_data *fds = &data->fds;
struct fd_data *recv_fds = &data->recv_fds;
int max_queue = data->max_queue;
int commandtimeout = data->commandtimeout;
pthread_mutex_lock(fds->buf_mutex);
for (;;) {
/* Block waiting for data to become available for reading */
int new_sd = fds_poll_recv(fds, -1, 0, event_wake_accept);
#ifdef _WIN32
ResetEvent(event_wake_accept);
#endif
/* TODO: what about sockets that get rm-ed? */
if (!fds->nfds) {
/* no more sockets to poll, all gave an error */
logg("!Main socket gone: fatal\n");
break;
}
if (new_sd == -1 && errno != EINTR) {
logg("!Failed to poll sockets, fatal\n");
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
break;
}
/* accept() loop */
for (i=0;i < fds->nfds && new_sd >= 0; i++) {
struct fd_buf *buf = &fds->buf[i];
if (!buf->got_newdata)
continue;
#ifndef _WIN32
if (buf->fd == data->syncpipe_wake_accept[0]) {
/* dummy sync pipe, just to wake us */
if (read(buf->fd, buff, sizeof(buff)) < 0) {
logg("^Syncpipe read failed\n");
}
continue;
}
#endif
if (buf->got_newdata == -1) {
logg("$Acceptloop closed FD: %d\n", buf->fd);
shutdown(buf->fd, 2);
closesocket(buf->fd);
buf->fd = -1;
continue;
}
/* don't accept unlimited number of connections, or
* we'll run out of file descriptors */
pthread_mutex_lock(recv_fds->buf_mutex);
while (recv_fds->nfds > (unsigned)max_queue) {
pthread_mutex_lock(&exit_mutex);
if(progexit) {
pthread_mutex_unlock(&exit_mutex);
break;
}
pthread_mutex_unlock(&exit_mutex);
pthread_cond_wait(&data->cond_nfds, recv_fds->buf_mutex);
}
pthread_mutex_unlock(recv_fds->buf_mutex);
pthread_mutex_lock(&exit_mutex);
if(progexit) {
pthread_mutex_unlock(&exit_mutex);
break;
}
pthread_mutex_unlock(&exit_mutex);
/* listen only socket */
new_sd = accept(fds->buf[i].fd, NULL, NULL);
if (new_sd >= 0) {
int ret, flags;
#ifdef F_GETFL
flags = fcntl(new_sd, F_GETFL, 0);
if (flags != -1) {
if (fcntl(new_sd, F_SETFL, flags | O_NONBLOCK) == -1) {
logg("^Can't set socket to nonblocking mode, errno %d\n",
errno);
}
} else {
logg("^Can't get socket flags, errno %d\n", errno);
}
#else
logg("^Nonblocking sockets not available!\n");
#endif
logg("$Got new connection, FD %d\n", new_sd);
pthread_mutex_lock(recv_fds->buf_mutex);
ret = fds_add(recv_fds, new_sd, 0, commandtimeout);
pthread_mutex_unlock(recv_fds->buf_mutex);
if (ret == -1) {
logg("!fds_add failed\n");
closesocket(new_sd);
continue;
}
/* notify recvloop */
#ifdef _WIN32
SetEvent(event_wake_recv);
#else
if (write(data->syncpipe_wake_recv[1], "", 1) == -1) {
logg("!write syncpipe failed\n");
continue;
}
#endif
} else if (errno != EINTR) {
/* very bad - need to exit or restart */
#ifdef HAVE_STRERROR_R
strerror_r(errno, buff, BUFFSIZE);
logg("!accept() failed: %s\n", buff);
#else
logg("!accept() failed\n");
#endif
/* give the poll loop a chance to close disconnected FDs */
break;
}
}
/* handle progexit */
pthread_mutex_lock(&exit_mutex);
if (progexit) {
pthread_mutex_unlock(&exit_mutex);
break;
}
pthread_mutex_unlock(&exit_mutex);
}
pthread_mutex_unlock(fds->buf_mutex);
for (i=0;i < fds->nfds; i++) {
if (fds->buf[i].fd == -1)
continue;
logg("$Shutdown: closed fd %d\n", fds->buf[i].fd);
shutdown(fds->buf[i].fd, 2);
closesocket(fds->buf[i].fd);
}
fds_free(fds);
pthread_mutex_destroy(fds->buf_mutex);
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
#ifdef _WIN32
SetEvent(event_wake_recv);
#else
if (write(data->syncpipe_wake_recv[1], "", 1) < 0) {
logg("$Syncpipe write failed\n");
}
#endif
return NULL;
}
static const char* parse_dispatch_cmd(client_conn_t *conn, struct fd_buf *buf, size_t *ppos, int *error, const struct optstruct *opts, int readtimeout)
{
const char *cmd = NULL;
int rc;
size_t cmdlen;
char term;
int oldstyle;
size_t pos = *ppos;
/* Parse & dispatch commands */
while ((conn->mode == MODE_COMMAND) &&
(cmd = get_cmd(buf, pos, &cmdlen, &term, &oldstyle)) != NULL) {
const char *argument;
enum commands cmdtype;
if (conn->group && oldstyle) {
logg("$Received oldstyle command inside IDSESSION: %s\n", cmd);
conn_reply_error(conn, "Only nCMDS\\n and zCMDS\\0 are accepted inside IDSESSION.");
*error = 1;
break;
}
cmdtype = parse_command(cmd, &argument, oldstyle);
logg("$got command %s (%u, %u), argument: %s\n",
cmd, (unsigned)cmdlen, (unsigned)cmdtype, argument ? argument : "");
if (cmdtype == COMMAND_FILDES) {
if (buf->buffer + buf->off <= cmd + strlen("FILDES\n")) {
/* we need the extra byte from recvmsg */
conn->mode = MODE_WAITANCILL;
buf->mode = MODE_WAITANCILL;
/* put term back */
buf->buffer[pos + cmdlen] = term;
cmdlen = 0;
logg("$RECVTH: mode -> MODE_WAITANCILL\n");
break;
}
/* eat extra \0 for controlmsg */
cmdlen++;
logg("$RECVTH: FILDES command complete\n");
}
conn->term = term;
buf->term = term;
if ((rc = execute_or_dispatch_command(conn, cmdtype, argument)) < 0) {
logg("!Command dispatch failed\n");
if(rc == -1 && optget(opts, "ExitOnOOM")->enabled) {
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
}
*error = 1;
}
if (thrmgr_group_need_terminate(conn->group)) {
logg("$Receive thread: have to terminate group\n");
*error = CL_ETIMEOUT;
break;
}
if (*error || !conn->group || rc) {
if (rc && thrmgr_group_finished(conn->group, EXIT_OK)) {
logg("$Receive thread: closing conn (FD %d), group finished\n", conn->sd);
/* if there are no more active jobs */
shutdown(conn->sd, 2);
closesocket(conn->sd);
buf->fd = -1;
conn->group = NULL;
} else if (conn->mode != MODE_STREAM) {
logg("$mode -> MODE_WAITREPLY\n");
/* no more commands are accepted */
conn->mode = MODE_WAITREPLY;
/* Stop monitoring this FD, it will be closed either
* by us, or by the scanner thread.
* Never close a file descriptor that is being
* monitored by poll()/select() from another thread,
* because this can lead to subtle bugs such as:
* Other thread closes file descriptor -> POLLHUP is
* set, but the poller thread doesn't wake up yet.
* Another client opens a connection and sends some
* data. If the socket reuses the previous file descriptor,
* then POLLIN is set on the file descriptor too.
* When poll() wakes up it sees POLLIN | POLLHUP
* and thinks that the client has sent some data,
* and closed the connection, so clamd closes the
* connection in turn resulting in a bug.
*
* If we wouldn't have poll()-ed the file descriptor
* we closed in another thread, but rather made sure
* that we don't put a FD that we're about to close
* into poll()'s list of watched fds; then POLLHUP
* would be set, but the file descriptor would stay
* open, until we wake up from poll() and close it.
* Thus a new connection won't be able to reuse the
* same FD, and there is no bug.
* */
buf->fd = -1;
}
}
/* we received a command, set readtimeout */
time(&buf->timeout_at);
buf->timeout_at += readtimeout;
pos += cmdlen+1;
if (conn->mode == MODE_STREAM) {
/* TODO: this doesn't belong here */
buf->dumpname = conn->filename;
buf->dumpfd = conn->scanfd;
logg("$Receive thread: INSTREAM: %s fd %u\n", buf->dumpname, buf->dumpfd);
}
if (conn->mode != MODE_COMMAND) {
logg("$Breaking command loop, mode is no longer MODE_COMMAND\n");
break;
}
conn->id++;
}
*ppos = pos;
buf->mode = conn->mode;
buf->id = conn->id;
buf->group = conn->group;
buf->quota = conn->quota;
if (conn->scanfd != -1 && conn->scanfd != buf->dumpfd) {
logg("$Unclaimed file descriptor received, closing: %d\n", conn->scanfd);
close(conn->scanfd);
/* protocol error */
conn_reply_error(conn, "PROTOCOL ERROR: ancillary data sent without FILDES.");
*error = 1;
return NULL;
}
if (!*error) {
/* move partial command to beginning of buffer */
if (pos < buf->off) {
memmove (buf->buffer, &buf->buffer[pos], buf->off - pos);
buf->off -= pos;
} else
buf->off = 0;
if (buf->off)
logg("$Moved partial command: %lu\n", (unsigned long)buf->off);
else
logg("$Consumed entire command\n");
}
*ppos = pos;
return cmd;
}
/* static const unsigned char* parse_dispatch_cmd(client_conn_t *conn, struct fd_buf *buf, size_t *ppos, int *error, const struct optstruct *opts, int readtimeout) */
static int handle_stream(client_conn_t *conn, struct fd_buf *buf, const struct optstruct *opts, int *error, size_t *ppos, int readtimeout)
{
int rc;
size_t pos = *ppos;
size_t cmdlen;
logg("$mode == MODE_STREAM\n");
/* we received a chunk, set readtimeout */
time(&buf->timeout_at);
buf->timeout_at += readtimeout;
if (!buf->chunksize) {
/* read chunksize */
if (buf->off >= 4) {
uint32_t cs = *(uint32_t*)buf->buffer;
buf->chunksize = ntohl(cs);
logg("$Got chunksize: %u\n", buf->chunksize);
if (!buf->chunksize) {
/* chunksize 0 marks end of stream */
conn->scanfd = buf->dumpfd;
conn->term = buf->term;
buf->dumpfd = -1;
buf->mode = buf->group ? MODE_COMMAND : MODE_WAITREPLY;
if (buf->mode == MODE_WAITREPLY)
buf->fd = -1;
logg("$Chunks complete\n");
buf->dumpname = NULL;
if ((rc = execute_or_dispatch_command(conn, COMMAND_INSTREAMSCAN, NULL)) < 0) {
logg("!Command dispatch failed\n");
if(rc == -1 && optget(opts, "ExitOnOOM")->enabled) {
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
}
*error = 1;
} else {
pos = 4;
memmove (buf->buffer, &buf->buffer[pos], buf->off - pos);
buf->off -= pos;
*ppos = 0;
buf->id++;
return 0;
}
}
if (buf->chunksize > buf->quota) {
logg("^INSTREAM: Size limit reached, (requested: %lu, max: %lu)\n",
(unsigned long)buf->chunksize, (unsigned long)buf->quota);
conn_reply_error(conn, "INSTREAM size limit exceeded.");
*error = 1;
*ppos = pos;
return -1;
} else {
buf->quota -= buf->chunksize;
}
logg("$Quota: %lu\n", buf->quota);
pos = 4;
} else
return -1;
} else
pos = 0;
if (pos + buf->chunksize < buf->off)
cmdlen = buf->chunksize;
else
cmdlen = buf->off - pos;
buf->chunksize -= cmdlen;
if (cli_writen(buf->dumpfd, buf->buffer + pos, cmdlen) < 0) {
conn_reply_error(conn, "Error writing to temporary file");
logg("!INSTREAM: Can't write to temporary file.\n");
*error = 1;
}
logg("$Processed %lu bytes of chunkdata\n", cmdlen);
pos += cmdlen;
if (pos == buf->off) {
buf->off = 0;
}
*ppos = pos;
return 0;
}
int recvloop_th(int *socketds, unsigned nsockets, struct cl_engine *engine, unsigned int dboptions, const struct optstruct *opts)
{
int max_threads, max_queue, readtimeout, ret = 0;
unsigned int options = 0;
char timestr[32];
#ifndef _WIN32
struct sigaction sigact;
sigset_t sigset;
struct rlimit rlim;
#endif
mode_t old_umask;
const struct optstruct *opt;
char buff[BUFFSIZE + 1];
pid_t mainpid;
int idletimeout;
unsigned long long val;
size_t i, j, rr_last = 0;
pthread_t accept_th;
pthread_mutex_t fds_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t recvfds_mutex = PTHREAD_MUTEX_INITIALIZER;
struct acceptdata acceptdata = ACCEPTDATA_INIT(&fds_mutex, &recvfds_mutex);
struct fd_data *fds = &acceptdata.recv_fds;
time_t start_time, current_time;
unsigned int selfchk;
threadpool_t *thr_pool;
#if defined(CLAMUKO) || defined(CLAMAUTH)
pthread_t clamuko_pid;
pthread_attr_t clamuko_attr;
struct thrarg *tharg = NULL; /* shut up gcc */
#endif
#ifndef _WIN32
memset(&sigact, 0, sizeof(struct sigaction));
#endif
/* set up limits */
if((opt = optget(opts, "MaxScanSize"))->active) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MAX_SCANSIZE, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MAX_SCANSIZE) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MAX_SCANSIZE, NULL);
if(val)
logg("Limits: Global size limit set to %llu bytes.\n", val);
else
logg("^Limits: Global size limit protection disabled.\n");
if((opt = optget(opts, "MaxFileSize"))->active) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MAX_FILESIZE, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MAX_FILESIZE) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MAX_FILESIZE, NULL);
if(val)
logg("Limits: File size limit set to %llu bytes.\n", val);
else
logg("^Limits: File size limit protection disabled.\n");
#ifndef _WIN32
if(getrlimit(RLIMIT_FSIZE, &rlim) == 0) {
if(rlim.rlim_cur < (rlim_t) cl_engine_get_num(engine, CL_ENGINE_MAX_FILESIZE, NULL))
logg("^System limit for file size is lower than engine->maxfilesize\n");
if(rlim.rlim_cur < (rlim_t) cl_engine_get_num(engine, CL_ENGINE_MAX_SCANSIZE, NULL))
logg("^System limit for file size is lower than engine->maxscansize\n");
} else {
logg("^Cannot obtain resource limits for file size\n");
}
#endif
if((opt = optget(opts, "MaxRecursion"))->active) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MAX_RECURSION, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MAX_RECURSION) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MAX_RECURSION, NULL);
if(val)
logg("Limits: Recursion level limit set to %u.\n", (unsigned int) val);
else
logg("^Limits: Recursion level limit protection disabled.\n");
if((opt = optget(opts, "MaxFiles"))->active) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MAX_FILES, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MAX_FILES) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MAX_FILES, NULL);
if(val)
logg("Limits: Files limit set to %u.\n", (unsigned int) val);
else
logg("^Limits: Files limit protection disabled.\n");
#ifndef _WIN32
if (getrlimit(RLIMIT_CORE, &rlim) == 0) {
logg("*Limits: Core-dump limit is %lu.\n", (unsigned long)rlim.rlim_cur);
}
#endif
if(optget(opts, "ScanArchive")->enabled) {
logg("Archive support enabled.\n");
options |= CL_SCAN_ARCHIVE;
if(optget(opts, "ArchiveBlockEncrypted")->enabled) {
logg("Archive: Blocking encrypted archives.\n");
options |= CL_SCAN_BLOCKENCRYPTED;
}
} else {
logg("Archive support disabled.\n");
}
if(optget(opts, "AlgorithmicDetection")->enabled) {
logg("Algorithmic detection enabled.\n");
options |= CL_SCAN_ALGORITHMIC;
} else {
logg("Algorithmic detection disabled.\n");
}
if(optget(opts, "ScanPE")->enabled) {
logg("Portable Executable support enabled.\n");
options |= CL_SCAN_PE;
} else {
logg("Portable Executable support disabled.\n");
}
if(optget(opts, "ScanELF")->enabled) {
logg("ELF support enabled.\n");
options |= CL_SCAN_ELF;
} else {
logg("ELF support disabled.\n");
}
if(optget(opts, "ScanPE")->enabled || optget(opts, "ScanELF")->enabled) {
if(optget(opts, "DetectBrokenExecutables")->enabled) {
logg("Detection of broken executables enabled.\n");
options |= CL_SCAN_BLOCKBROKEN;
}
}
if(optget(opts, "ScanMail")->enabled) {
logg("Mail files support enabled.\n");
options |= CL_SCAN_MAIL;
if(optget(opts, "ScanPartialMessages")->enabled) {
logg("Mail: RFC1341 handling enabled.\n");
options |= CL_SCAN_PARTIAL_MESSAGE;
}
} else {
logg("Mail files support disabled.\n");
}
if(optget(opts, "ScanOLE2")->enabled) {
logg("OLE2 support enabled.\n");
options |= CL_SCAN_OLE2;
if(optget(opts, "OLE2BlockMacros")->enabled) {
logg("OLE2: Blocking all VBA macros.\n");
options |= CL_SCAN_BLOCKMACROS;
}
} else {
logg("OLE2 support disabled.\n");
}
if(optget(opts, "ScanPDF")->enabled) {
logg("PDF support enabled.\n");
options |= CL_SCAN_PDF;
} else {
logg("PDF support disabled.\n");
}
if(optget(opts, "ScanHTML")->enabled) {
logg("HTML support enabled.\n");
options |= CL_SCAN_HTML;
} else {
logg("HTML support disabled.\n");
}
if(optget(opts,"PhishingScanURLs")->enabled) {
if(optget(opts,"PhishingAlwaysBlockCloak")->enabled) {
options |= CL_SCAN_PHISHING_BLOCKCLOAK;
logg("Phishing: Always checking for cloaked urls\n");
}
if(optget(opts,"PhishingAlwaysBlockSSLMismatch")->enabled) {
options |= CL_SCAN_PHISHING_BLOCKSSL;
logg("Phishing: Always checking for ssl mismatches\n");
}
}
if(optget(opts,"HeuristicScanPrecedence")->enabled) {
options |= CL_SCAN_HEURISTIC_PRECEDENCE;
logg("Heuristic: precedence enabled\n");
}
if(optget(opts, "StructuredDataDetection")->enabled) {
options |= CL_SCAN_STRUCTURED;
if((opt = optget(opts, "StructuredMinCreditCardCount"))->enabled) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MIN_CC_COUNT, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MIN_CC_COUNT) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MIN_CC_COUNT, NULL);
logg("Structured: Minimum Credit Card Number Count set to %u\n", (unsigned int) val);
if((opt = optget(opts, "StructuredMinSSNCount"))->enabled) {
if((ret = cl_engine_set_num(engine, CL_ENGINE_MIN_SSN_COUNT, opt->numarg))) {
logg("!cl_engine_set_num(CL_ENGINE_MIN_SSN_COUNT) failed: %s\n", cl_strerror(ret));
cl_engine_free(engine);
return 1;
}
}
val = cl_engine_get_num(engine, CL_ENGINE_MIN_SSN_COUNT, NULL);
logg("Structured: Minimum Social Security Number Count set to %u\n", (unsigned int) val);
if(optget(opts, "StructuredSSNFormatNormal")->enabled)
options |= CL_SCAN_STRUCTURED_SSN_NORMAL;
if(optget(opts, "StructuredSSNFormatStripped")->enabled)
options |= CL_SCAN_STRUCTURED_SSN_STRIPPED;
}
#ifdef HAVE__INTERNAL__SHA_COLLECT
if(optget(opts, "DevCollectHashes")->enabled)
options |= CL_SCAN_INTERNAL_COLLECT_SHA;
#endif
selfchk = optget(opts, "SelfCheck")->numarg;
if(!selfchk) {
logg("Self checking disabled.\n");
} else {
logg("Self checking every %u seconds.\n", selfchk);
}
memset(&dbstat, 0, sizeof(dbstat));
/* save the PID */
mainpid = getpid();
if((opt = optget(opts, "PidFile"))->enabled) {
FILE *fd;
old_umask = umask(0002);
if((fd = fopen(opt->strarg, "w")) == NULL) {
logg("!Can't save PID in file %s\n", opt->strarg);
} else {
if (fprintf(fd, "%u", (unsigned int) mainpid)<0) {
logg("!Can't save PID in file %s\n", opt->strarg);
}
fclose(fd);
}
umask(old_umask);
}
logg("*Listening daemon: PID: %u\n", (unsigned int) mainpid);
max_threads = optget(opts, "MaxThreads")->numarg;
max_queue = optget(opts, "MaxQueue")->numarg;
acceptdata.commandtimeout = optget(opts, "CommandReadTimeout")->numarg;
readtimeout = optget(opts, "ReadTimeout")->numarg;
#if !defined(_WIN32) && defined(RLIMIT_NOFILE)
if (getrlimit(RLIMIT_NOFILE, &rlim) == 0) {
/* don't warn if default value is too high, silently fix it */
unsigned maxrec;
int max_max_queue;
unsigned warn = optget(opts, "MaxQueue")->active;
const unsigned clamdfiles = 6;
/* Condition to not run out of file descriptors:
* MaxThreads * MaxRecursion + (MaxQueue - MaxThreads) + CLAMDFILES < RLIMIT_NOFILE
* CLAMDFILES is 6: 3 standard FD + logfile + 2 FD for reloading the DB
* */
#ifdef C_SOLARIS
#ifdef HAVE_ENABLE_EXTENDED_FILE_STDIO
if (enable_extended_FILE_stdio(-1, -1) == -1) {
logg("^Unable to set extended FILE stdio, clamd will be limited to max 256 open files\n");
rlim.rlim_cur = rlim.rlim_cur > 255 ? 255 : rlim.rlim_cur;
}
#elif !defined(_LP64)
if (rlim.rlim_cur > 255) {
rlim.rlim_cur = 255;
logg("^Solaris only supports 256 open files for 32-bit processes, you need at least Solaris 10u4, or compile as 64-bit to support more!\n");
}
#endif
#endif
opt = optget(opts,"MaxRecursion");
maxrec = opt->numarg;
max_max_queue = rlim.rlim_cur - maxrec * max_threads - clamdfiles + max_threads;
if (max_queue < max_threads) {
max_queue = max_threads;
if (warn)
logg("^MaxQueue value too low, increasing to: %d\n", max_queue);
}
if (max_max_queue < max_threads) {
logg("^MaxThreads * MaxRecursion is too high: %d, open file descriptor limit is: %lu\n",
maxrec*max_threads, (unsigned long)rlim.rlim_cur);
max_max_queue = max_threads;
}
if (max_queue > max_max_queue) {
max_queue = max_max_queue;
if (warn)
logg("^MaxQueue value too high, lowering to: %d\n", max_queue);
} else if (max_queue < 2*max_threads && max_queue < max_max_queue) {
max_queue = 2*max_threads;
if (max_queue > max_max_queue)
max_queue = max_max_queue;
/* always warn here */
logg("^MaxQueue is lower than twice MaxThreads, increasing to: %d\n", max_queue);
}
}
#endif
logg("*MaxQueue set to: %d\n", max_queue);
acceptdata.max_queue = max_queue;
if(optget(opts, "ClamukoScanOnAccess")->enabled || optget(opts, "ClamAuth")->enabled)
#if defined(CLAMUKO) || defined(CLAMAUTH)
{
do {
if(pthread_attr_init(&clamuko_attr)) break;
pthread_attr_setdetachstate(&clamuko_attr, PTHREAD_CREATE_JOINABLE);
if(!(tharg = (struct thrarg *) malloc(sizeof(struct thrarg)))) break;
tharg->opts = opts;
tharg->engine = engine;
tharg->options = options;
if(!pthread_create(&clamuko_pid, &clamuko_attr, clamukoth, tharg)) break;
free(tharg);
tharg=NULL;
} while(0);
if (!tharg) logg("!Unable to start Clamuko\n");
}
#else
logg("Clamuko is not available.\n");
#endif
#ifndef _WIN32
/* set up signal handling */
sigfillset(&sigset);
sigdelset(&sigset, SIGINT);
sigdelset(&sigset, SIGTERM);
sigdelset(&sigset, SIGSEGV);
sigdelset(&sigset, SIGHUP);
sigdelset(&sigset, SIGPIPE);
sigdelset(&sigset, SIGUSR2);
/* The behavior of a process is undefined after it ignores a
* SIGFPE, SIGILL, SIGSEGV, or SIGBUS signal */
sigdelset(&sigset, SIGFPE);
sigdelset(&sigset, SIGILL);
sigdelset(&sigset, SIGSEGV);
#ifdef SIGBUS
sigdelset(&sigset, SIGBUS);
#endif
sigdelset(&sigset, SIGTSTP);
sigdelset(&sigset, SIGCONT);
sigprocmask(SIG_SETMASK, &sigset, NULL);
/* SIGINT, SIGTERM, SIGSEGV */
sigact.sa_handler = sighandler_th;
sigemptyset(&sigact.sa_mask);
sigaddset(&sigact.sa_mask, SIGINT);
sigaddset(&sigact.sa_mask, SIGTERM);
sigaddset(&sigact.sa_mask, SIGHUP);
sigaddset(&sigact.sa_mask, SIGPIPE);
sigaddset(&sigact.sa_mask, SIGUSR2);
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGHUP, &sigact, NULL);
sigaction(SIGPIPE, &sigact, NULL);
sigaction(SIGUSR2, &sigact, NULL);
#endif
idletimeout = optget(opts, "IdleTimeout")->numarg;
for (i=0;i < nsockets;i++)
if (fds_add(&acceptdata.fds, socketds[i], 1, 0) == -1) {
logg("!fds_add failed\n");
cl_engine_free(engine);
return 1;
}
#ifdef _WIN32
event_wake_accept = CreateEvent(NULL, TRUE, FALSE, NULL);
event_wake_recv = CreateEvent(NULL, TRUE, FALSE, NULL);
#else
if (pipe(acceptdata.syncpipe_wake_recv) == -1 ||
(pipe(acceptdata.syncpipe_wake_accept) == -1)) {
logg("!pipe failed\n");
exit(-1);
}
syncpipe_wake_recv_w = acceptdata.syncpipe_wake_recv[1];
if (fds_add(fds, acceptdata.syncpipe_wake_recv[0], 1, 0) == -1 ||
fds_add(&acceptdata.fds, acceptdata.syncpipe_wake_accept[0], 1, 0)) {
logg("!failed to add pipe fd\n");
exit(-1);
}
#endif
if ((thr_pool = thrmgr_new(max_threads, idletimeout, max_queue, scanner_thread)) == NULL) {
logg("!thrmgr_new failed\n");
exit(-1);
}
if (pthread_create(&accept_th, NULL, acceptloop_th, &acceptdata)) {
logg("!pthread_create failed\n");
exit(-1);
}
time(&start_time);
for(;;) {
int new_sd;
/* Block waiting for connection on any of the sockets */
pthread_mutex_lock(fds->buf_mutex);
fds_cleanup(fds);
/* signal that we can accept more connections */
if (fds->nfds <= (unsigned)max_queue)
pthread_cond_signal(&acceptdata.cond_nfds);
new_sd = fds_poll_recv(fds, selfchk ? (int)selfchk : -1, 1, event_wake_recv);
#ifdef _WIN32
ResetEvent(event_wake_recv);
#else
if (!fds->nfds) {
/* at least the dummy/sync pipe should have remained */
logg("!All recv() descriptors gone: fatal\n");
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
pthread_mutex_unlock(fds->buf_mutex);
break;
}
#endif
if (new_sd == -1 && errno != EINTR) {
logg("!Failed to poll sockets, fatal\n");
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
}
if(fds->nfds) i = (rr_last + 1) % fds->nfds;
for (j = 0; j < fds->nfds && new_sd >= 0; j++, i = (i+1) % fds->nfds) {
size_t pos = 0;
int error = 0;
struct fd_buf *buf = &fds->buf[i];
if (!buf->got_newdata)
continue;
#ifndef _WIN32
if (buf->fd == acceptdata.syncpipe_wake_recv[0]) {
/* dummy sync pipe, just to wake us */
if (read(buf->fd, buff, sizeof(buff)) < 0) {
logg("^Syncpipe read failed\n");
}
continue;
}
#endif
if (buf->got_newdata == -1) {
if (buf->mode == MODE_WAITREPLY) {
logg("$mode WAIT_REPLY -> closed\n");
buf->fd = -1;
thrmgr_group_terminate(buf->group);
thrmgr_group_finished(buf->group, EXIT_ERROR);
continue;
} else {
logg("$client read error or EOF on read\n");
error = 1;
}
}
if (buf->fd != -1 && buf->got_newdata == -2) {
logg("$Client read timed out\n");
mdprintf(buf->fd, "COMMAND READ TIMED OUT\n");
error = 1;
}
rr_last = i;
if (buf->mode == MODE_WAITANCILL) {
buf->mode = MODE_COMMAND;
logg("$mode -> MODE_COMMAND\n");
}
while (!error && buf->fd != -1 && buf->buffer && pos < buf->off &&
buf->mode != MODE_WAITANCILL) {
client_conn_t conn;
const char *cmd = NULL;
int rc;
/* New data available to read on socket. */
memset(&conn, 0, sizeof(conn));
conn.scanfd = buf->recvfd;
buf->recvfd = -1;
conn.sd = buf->fd;
conn.options = options;
conn.opts = opts;
conn.thrpool = thr_pool;
conn.engine = engine;
conn.group = buf->group;
conn.id = buf->id;
conn.quota = buf->quota;
conn.filename = buf->dumpname;
conn.mode = buf->mode;
conn.term = buf->term;
/* Parse & dispatch command */
cmd = parse_dispatch_cmd(&conn, buf, &pos, &error, opts, readtimeout);
if (conn.mode == MODE_COMMAND && !cmd)
break;
if (!error) {
if (buf->mode == MODE_WAITREPLY && buf->off) {
/* Client is not supposed to send anything more */
logg("^Client sent garbage after last command: %lu bytes\n", (unsigned long)buf->off);
buf->buffer[buf->off] = '\0';
logg("$Garbage: %s\n", buf->buffer);
error = 1;
} else if (buf->mode == MODE_STREAM) {
rc = handle_stream(&conn, buf, opts, &error, &pos, readtimeout);
if (rc == -1)
break;
else
continue;
}
}
if (error && error != CL_ETIMEOUT) {
conn_reply_error(&conn, "Error processing command.");
}
}
if (error) {
if (buf->dumpfd != -1) {
close(buf->dumpfd);
if (buf->dumpname) {
cli_unlink(buf->dumpname);
free(buf->dumpname);
}
buf->dumpfd = -1;
}
thrmgr_group_terminate(buf->group);
if (thrmgr_group_finished(buf->group, EXIT_ERROR)) {
logg("$Shutting down socket after error (FD %d)\n", buf->fd);
shutdown(buf->fd, 2);
closesocket(buf->fd);
} else
logg("$Socket not shut down due to active tasks\n");
buf->fd = -1;
}
}
pthread_mutex_unlock(fds->buf_mutex);
/* handle progexit */
pthread_mutex_lock(&exit_mutex);
if (progexit) {
pthread_mutex_unlock(&exit_mutex);
pthread_mutex_lock(fds->buf_mutex);
for (i=0;i < fds->nfds; i++) {
if (fds->buf[i].fd == -1)
continue;
thrmgr_group_terminate(fds->buf[i].group);
if (thrmgr_group_finished(fds->buf[i].group, EXIT_ERROR)) {
logg("$Shutdown closed fd %d\n", fds->buf[i].fd);
shutdown(fds->buf[i].fd, 2);
closesocket(fds->buf[i].fd);
fds->buf[i].fd = -1;
}
}
pthread_mutex_unlock(fds->buf_mutex);
break;
}
pthread_mutex_unlock(&exit_mutex);
/* SIGHUP */
if (sighup) {
logg("SIGHUP caught: re-opening log file.\n");
logg_close();
sighup = 0;
if(!logg_file && (opt = optget(opts, "LogFile"))->enabled)
logg_file = opt->strarg;
}
/* SelfCheck */
if(selfchk) {
time(¤t_time);
if((current_time - start_time) >= (time_t)selfchk) {
if(reload_db(engine, dboptions, opts, TRUE, &ret)) {
pthread_mutex_lock(&reload_mutex);
reload = 1;
pthread_mutex_unlock(&reload_mutex);
}
time(&start_time);
}
}
/* DB reload */
pthread_mutex_lock(&reload_mutex);
if(reload) {
pthread_mutex_unlock(&reload_mutex);
#if defined(CLAMUKO) || defined(CLAMAUTH)
if((optget(opts, "ClamukoScanOnAccess")->enabled || optget(opts, "ClamAuth")->enabled) && tharg) {
logg("Stopping and restarting Clamuko.\n");
pthread_kill(clamuko_pid, SIGUSR1);
pthread_join(clamuko_pid, NULL);
}
#endif
engine = reload_db(engine, dboptions, opts, FALSE, &ret);
if(ret) {
logg("Terminating because of a fatal error.\n");
if(new_sd >= 0)
closesocket(new_sd);
break;
}
pthread_mutex_lock(&reload_mutex);
reload = 0;
time(&reloaded_time);
pthread_mutex_unlock(&reload_mutex);
#if defined(CLAMUKO) || defined(CLAMAUTH)
if((optget(opts, "ClamukoScanOnAccess")->enabled || optget(opts, "ClamAuth")->enabled) && tharg) {
tharg->engine = engine;
pthread_create(&clamuko_pid, &clamuko_attr, clamukoth, tharg);
}
#endif
time(&start_time);
} else {
pthread_mutex_unlock(&reload_mutex);
}
}
pthread_mutex_lock(&exit_mutex);
progexit = 1;
pthread_mutex_unlock(&exit_mutex);
#ifdef _WIN32
SetEvent(event_wake_accept);
#else
if (write(acceptdata.syncpipe_wake_accept[1], "", 1) < 0) {
logg("^Write to syncpipe failed\n");
}
#endif
/* Destroy the thread manager.
* This waits for all current tasks to end
*/
logg("*Waiting for all threads to finish\n");
thrmgr_destroy(thr_pool);
#if defined(CLAMUKO) || defined(CLAMAUTH)
if(optget(opts, "ClamukoScanOnAccess")->enabled || optget(opts, "ClamAuth")->enabled) {
logg("Stopping Clamuko.\n");
pthread_kill(clamuko_pid, SIGUSR1);
pthread_join(clamuko_pid, NULL);
}
#endif
if(engine) {
thrmgr_setactiveengine(NULL);
cl_engine_free(engine);
}
pthread_join(accept_th, NULL);
fds_free(fds);
pthread_mutex_destroy(fds->buf_mutex);
pthread_cond_destroy(&acceptdata.cond_nfds);
#ifdef _WIN32
CloseHandle(event_wake_accept);
CloseHandle(event_wake_recv);
#else
close(acceptdata.syncpipe_wake_accept[1]);
close(acceptdata.syncpipe_wake_recv[1]);
#endif
if(dbstat.entries)
cl_statfree(&dbstat);
logg("*Shutting down the main socket%s.\n", (nsockets > 1) ? "s" : "");
for (i = 0; i < nsockets; i++)
shutdown(socketds[i], 2);
if((opt = optget(opts, "PidFile"))->enabled) {
if(unlink(opt->strarg) == -1)
logg("!Can't unlink the pid file %s\n", opt->strarg);
else
logg("Pid file removed.\n");
}
time(¤t_time);
logg("--- Stopped at %s", cli_ctime(¤t_time, timestr, sizeof(timestr)));
return ret;
}