/*
* Copyright (C) 2007-2009 Sourcefire, Inc.
*
* Authors: Tomasz Kojm, Török Edvin
*
* 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.
*/
#ifdef _MSC_VER
#include <winsock.h>
#endif
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef C_WINDOWS
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <signal.h>
#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#include <pthread.h>
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
#include <limits.h>
#include <stddef.h>
#endif
#include "libclamav/clamav.h"
#include "libclamav/others.h"
#include "shared/optparser.h"
#include "shared/output.h"
#include "shared/misc.h"
#include "others.h"
#include "scanner.h"
#include "shared.h"
#include "network.h"
#include "thrmgr.h"
#include "server.h"
#ifdef C_LINUX
dev_t procdev; /* /proc device */
#endif
#ifndef C_WINDOWS
#define closesocket(s) close(s)
#endif
extern int progexit;
extern time_t reloaded_time;
extern pthread_mutex_t reload_mutex;
#define BUFFSIZE 1024
int scan_callback(struct stat *sb, char *filename, const char *msg, enum cli_ftw_reason reason, struct cli_ftw_cbdata *data)
{
struct scan_cb_data *scandata = data->data;
const char *virname;
int ret;
int type = scandata->type;
const struct optstruct *opt;
/* detect disconnected socket,
* this should NOT detect half-shutdown sockets (SHUT_WR) */
if (send(scandata->conn->sd, &ret, 0, 0) == -1 && errno != EINTR) {
logg("$Client disconnected while command was active!\n");
thrmgr_group_terminate(scandata->conn->group);
return CL_BREAK;
}
if (thrmgr_group_need_terminate(scandata->conn->group)) {
logg("^Client disconnected while scanjob was active\n");
if (reason == visit_file)
free(filename);
return CL_BREAK;
}
scandata->total++;
switch (reason) {
case error_mem:
if (msg)
logg("!Memory allocation failed during cli_ftw() on %s\n",
msg);
else
logg("!Memory allocation failed during cli_ftw()\n");
scandata->errors++;
return CL_EMEM;
case error_stat:
if (msg == scandata->toplevel_path)
conn_reply_errno(scandata->conn, msg, "lstat() failed:");
logg("^lstat() failed on: %s\n", msg);
scandata->errors++;
return CL_SUCCESS;
case warning_skipped_dir:
logg("^Directory recursion limit reached, skipping %s\n",
msg);
return CL_SUCCESS;
case warning_skipped_link:
logg("$Skipping symlink: %s\n", msg);
return CL_SUCCESS;
case warning_skipped_special:
if (msg == scandata->toplevel_path)
conn_reply(scandata->conn, msg, "Not supported file type", "ERROR");
logg("*Not supported file type: %s\n", msg);
return CL_SUCCESS;
case visit_directory_toplev:
return CL_SUCCESS;
case visit_file:
break;
}
/* check whether the file is excluded */
#ifdef C_LINUX
if(procdev && sb && (sb->st_dev == procdev)) {
free(filename);
return CL_SUCCESS;
}
#endif
if((opt = optget(scandata->opts, "ExcludePath"))->enabled) {
while (opt) {
/* TODO: perhaps multiscan should skip this check?
* This should work unless the user is doing something stupid like
* MULTISCAN / */
if(match_regex(filename, opt->strarg) == 1) {
if (type != TYPE_MULTISCAN)
conn_reply_single(scandata->conn, filename, "Excluded");
free(filename);
return CL_SUCCESS;
}
opt = (const struct optstruct *) opt->nextarg;
}
}
if(sb && sb->st_size == 0) { /* empty file */
if (msg == scandata->toplevel_path)
conn_reply_single(scandata->conn, filename, "Empty file");
free(filename);
return CL_SUCCESS;
}
if (type == TYPE_MULTISCAN) {
client_conn_t *client_conn = (client_conn_t *) calloc(1, sizeof(struct client_conn_tag));
if(client_conn) {
client_conn->scanfd = -1;
client_conn->sd = scandata->odesc;
client_conn->filename = filename;
client_conn->cmdtype = COMMAND_MULTISCANFILE;
client_conn->term = scandata->conn->term;
client_conn->options = scandata->options;
client_conn->opts = scandata->opts;
client_conn->group = scandata->group;
if(cl_engine_addref(scandata->engine)) {
logg("!cl_engine_addref() failed\n");
free(filename);
return CL_EMEM;
} else {
client_conn->engine = scandata->engine;
pthread_mutex_lock(&reload_mutex);
client_conn->engine_timestamp = reloaded_time;
pthread_mutex_unlock(&reload_mutex);
if(!thrmgr_group_dispatch(scandata->thr_pool, scandata->group, client_conn)) {
logg("!thread dispatch failed\n");
free(filename);
return CL_EMEM;
}
}
} else {
logg("!Can't allocate memory for client_conn\n");
scandata->errors++;
free(filename);
return CL_EMEM;
}
return CL_SUCCESS;
}
if (access(filename, R_OK)) {
if (conn_reply(scandata->conn, filename, "Access denied.", "ERROR") == -1)
return CL_ETIMEOUT;
logg("*Access denied: %s\n", filename);
scandata->errors++;
free(filename);
return CL_SUCCESS;
}
thrmgr_setactivetask(filename,
type == TYPE_MULTISCAN ? "MULTISCANFILE" : NULL);
ret = cl_scanfile(filename, &virname, &scandata->scanned, scandata->engine, scandata->options);
thrmgr_setactivetask(NULL, NULL);
if (thrmgr_group_need_terminate(scandata->conn->group)) {
logg("*Client disconnected while scanjob was active\n");
return ret == CL_ETIMEOUT ? ret : CL_BREAK;
}
if (ret == CL_VIRUS) {
scandata->infected++;
if (conn_reply(scandata->conn, filename, virname, "FOUND") == -1)
return CL_ETIMEOUT;
logg("~%s: %s FOUND\n", filename, virname);
virusaction(filename, virname, scandata->opts);
} else if (ret != CL_CLEAN) {
scandata->errors++;
if (conn_reply(scandata->conn, filename, cl_strerror(ret), "ERROR") == -1)
return CL_ETIMEOUT;
logg("~%s: %s ERROR\n", filename, cl_strerror(ret));
} else if (logok) {
logg("~%s: OK\n", filename);
}
free(filename);
if(ret == CL_EMEM) /* stop scanning */
return ret;
if (type == TYPE_SCAN) {
/* virus -> break */
return ret;
}
/* keep scanning always */
return CL_SUCCESS;
}
int scanfd(const int fd, const client_conn_t *conn, unsigned long int *scanned,
const struct cl_engine *engine,
unsigned int options, const struct optstruct *opts, int odesc, int stream)
{
int ret;
const char *virname;
struct stat statbuf;
char fdstr[32];
if (stream)
strncpy(fdstr, "stream", sizeof(fdstr));
else
snprintf(fdstr, sizeof(fdstr), "fd[%d]", fd);
if(fstat(fd, &statbuf) == -1 || !S_ISREG(statbuf.st_mode)) {
logg("%s: Not a regular file. ERROR\n", fdstr);
if (conn_reply(conn, fdstr, "Not a regular file", "ERROR") == -1)
return CL_ETIMEOUT;
return -1;
}
thrmgr_setactivetask(fdstr, NULL);
ret = cl_scandesc(fd, &virname, scanned, engine, options);
thrmgr_setactivetask(NULL, NULL);
if (thrmgr_group_need_terminate(conn->group)) {
logg("*Client disconnected while scanjob was active\n");
return ret == CL_ETIMEOUT ? ret : CL_BREAK;
}
if(ret == CL_VIRUS) {
if (conn_reply(conn, fdstr, virname, "FOUND") == -1)
ret = CL_ETIMEOUT;
logg("%s: %s FOUND\n", fdstr, virname);
virusaction(fdstr, virname, opts);
} else if(ret != CL_CLEAN) {
if (conn_reply(conn, fdstr, cl_strerror(ret), "ERROR") == -1)
ret = CL_ETIMEOUT;
logg("%s: %s ERROR\n", fdstr, cl_strerror(ret));
} else {
if (conn_reply_single(conn, fdstr, "OK") == CL_ETIMEOUT)
ret = CL_ETIMEOUT;
if(logok)
logg("%s: OK\n", fdstr);
}
return ret;
}
int scanstream(int odesc, unsigned long int *scanned, const struct cl_engine *engine, unsigned int options, const struct optstruct *opts, char term)
{
int ret, sockfd, acceptd;
int tmpd, bread, retval, firsttimeout, timeout, btread;
unsigned int port = 0, portscan, min_port, max_port;
unsigned long int quota = 0, maxsize = 0;
short bound = 0;
const char *virname;
char buff[FILEBUFF];
char peer_addr[32];
struct sockaddr_in server;
struct sockaddr_in peer;
socklen_t addrlen;
char *tmpname;
min_port = optget(opts, "StreamMinPort")->numarg;
max_port = optget(opts, "StreamMaxPort")->numarg;
/* search for a free port to bind to */
port = cli_rndnum(max_port - min_port);
bound = 0;
for (portscan = 0; portscan < 1000; portscan++) {
port = (port - 1) % (max_port - min_port + 1);
memset((char *) &server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(min_port + port);
server.sin_addr.s_addr = htonl(INADDR_ANY);
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
continue;
if(bind(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) == -1)
closesocket(sockfd);
else {
bound = 1;
break;
}
}
port += min_port;
timeout = optget(opts, "ReadTimeout")->numarg;
if(timeout == 0)
timeout = -1;
firsttimeout = optget(opts, "CommandReadTimeout")->numarg;
if (firsttimeout == 0)
firsttimeout = -1;
if(!bound && !portscan) {
logg("!ScanStream: Can't find any free port.\n");
mdprintf(odesc, "Can't find any free port. ERROR%c", term);
closesocket(sockfd);
return -1;
} else {
listen(sockfd, 1);
if(mdprintf(odesc, "PORT %u%c", port, term) <= 0) {
logg("!ScanStream: error transmitting port.\n");
closesocket(sockfd);
return -1;
}
}
retval = poll_fd(sockfd, firsttimeout, 0);
if (!retval || retval == -1) {
const char *reason = !retval ? "timeout" : "poll";
mdprintf(odesc, "Accept %s. ERROR%c", reason, term);
logg("!ScanStream %u: accept %s.\n", port, reason);
closesocket(sockfd);
return -1;
}
addrlen = sizeof(peer);
if((acceptd = accept(sockfd, (struct sockaddr *) &peer, &addrlen)) == -1) {
closesocket(sockfd);
mdprintf(odesc, "accept() ERROR%c", term);
logg("!ScanStream %u: accept() failed.\n", port);
return -1;
}
snprintf(peer_addr, sizeof(peer_addr), "%s", inet_ntoa(peer.sin_addr));
logg("*Accepted connection from %s on port %u, fd %d\n", peer_addr, port, acceptd);
if(cli_gentempfd(optget(opts, "TemporaryDirectory")->strarg, &tmpname, &tmpd)) {
shutdown(sockfd, 2);
closesocket(sockfd);
closesocket(acceptd);
mdprintf(odesc, "cli_gentempfd() failed. ERROR%c", term);
logg("!ScanStream(%s@%u): Can't create temporary file.\n", peer_addr, port);
return -1;
}
quota = maxsize = optget(opts, "StreamMaxLength")->numarg;
while((retval = poll_fd(acceptd, timeout, 0)) == 1) {
/* only read up to max */
btread = (maxsize && (quota < sizeof(buff))) ? quota : sizeof(buff);
if (!btread) {
logg("^ScanStream(%s@%u): Size limit reached (max: %lu)\n", peer_addr, port, maxsize);
break; /* Scan what we have */
}
bread = recv(acceptd, buff, btread, 0);
if(bread <= 0)
break;
quota -= bread;
if(writen(tmpd, buff, bread) != bread) {
shutdown(sockfd, 2);
closesocket(sockfd);
closesocket(acceptd);
mdprintf(odesc, "Temporary file -> write ERROR%c", term);
logg("!ScanStream(%s@%u): Can't write to temporary file.\n", peer_addr, port);
close(tmpd);
if(!optget(opts, "LeaveTemporaryFiles")->enabled)
unlink(tmpname);
free(tmpname);
return -1;
}
}
switch(retval) {
case 0: /* timeout */
mdprintf(odesc, "read timeout ERROR%c", term);
logg("!ScanStream(%s@%u): read timeout.\n", peer_addr, port);
break;
case -1:
mdprintf(odesc, "read poll ERROR%c", term);
logg("!ScanStream(%s@%u): read poll failed.\n", peer_addr, port);
break;
}
if(retval == 1) {
lseek(tmpd, 0, SEEK_SET);
thrmgr_setactivetask(peer_addr, NULL);
ret = cl_scandesc(tmpd, &virname, scanned, engine, options);
thrmgr_setactivetask(NULL, NULL);
} else {
ret = -1;
}
close(tmpd);
if(!optget(opts, "LeaveTemporaryFiles")->enabled)
unlink(tmpname);
free(tmpname);
closesocket(acceptd);
closesocket(sockfd);
if(ret == CL_VIRUS) {
mdprintf(odesc, "stream: %s FOUND%c", virname, term);
logg("stream(%s@%u): %s FOUND\n", peer_addr, port, virname);
virusaction("stream", virname, opts);
} else if(ret != CL_CLEAN) {
if(retval == 1) {
mdprintf(odesc, "stream: %s ERROR%c", cl_strerror(ret), term);
logg("stream(%s@%u): %s ERROR\n", peer_addr, port, cl_strerror(ret));
}
} else {
mdprintf(odesc, "stream: OK%c", term);
if(logok)
logg("stream(%s@%u): OK\n", peer_addr, port);
}
return ret;
}