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347 lines
9.1 KiB
347 lines
9.1 KiB
/*
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* Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <dirent.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <clamav.h>
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#include "cfgparser.h"
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#include "others.h"
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#include "scanner.h"
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#include "defaults.h"
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#include "memory.h"
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#include "shared.h"
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#include "output.h"
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int checksymlink(const char *path)
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{
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struct stat statbuf;
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if(stat(path, &statbuf) == -1)
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return -1;
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if(S_ISDIR(statbuf.st_mode))
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return 1;
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if(S_ISREG(statbuf.st_mode))
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return 2;
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return 0;
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}
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/* :set nowrap, if you don't like this style ;)) */
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int dirscan(const char *dirname, const char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt, int odesc, unsigned int *reclev, short contscan)
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{
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DIR *dd;
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struct dirent *dent;
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struct stat statbuf;
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struct cfgstruct *cpt;
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char *fname;
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int ret = 0, scanret = 0;
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if((cpt = cfgopt(copt, "MaxDirectoryRecursion"))) {
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if(cpt->numarg) {
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if(*reclev > cpt->numarg) {
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logg("*Directory recursion limit exceeded at %s\n", dirname);
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return 0;
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}
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(*reclev)++;
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}
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}
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if((dd = opendir(dirname)) != NULL) {
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while((dent = readdir(dd))) {
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if (!is_fd_connected(odesc)) {
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logg("Client disconnected\n");
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closedir(dd);
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return 1;
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}
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if(dent->d_ino) {
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if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
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/* build the full name */
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fname = (char *) mcalloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
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sprintf(fname, "%s/%s", dirname, dent->d_name);
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/* stat the file */
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if(lstat(fname, &statbuf) != -1) {
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if((S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) || (S_ISLNK(statbuf.st_mode) && (checksymlink(fname) == 1) && cfgopt(copt, "FollowDirectorySymlinks"))) {
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if(dirscan(fname, virname, scanned, root, limits, options, copt, odesc, reclev, contscan) == 1) {
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free(fname);
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closedir(dd);
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return 1;
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}
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} else {
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if(S_ISREG(statbuf.st_mode) || (S_ISLNK(statbuf.st_mode) && (checksymlink(fname) == 2) && cfgopt(copt, "FollowFileSymlinks"))) {
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if((scanret = cl_scanfile(fname, virname, scanned, root, limits, options)) == CL_VIRUS) {
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mdprintf(odesc, "%s: %s FOUND\n", fname, *virname);
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logg("%s: %s FOUND\n", fname, *virname);
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virusaction(fname, *virname, copt);
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if(!contscan) {
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closedir(dd);
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free(fname);
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return 1;
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} else
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ret = 2;
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} else if(scanret != CL_CLEAN) {
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mdprintf(odesc, "%s: %s ERROR\n", fname, cl_strerror(scanret));
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logg("%s: %s ERROR\n", fname, cl_strerror(scanret));
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} else if (logok) {
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logg("%s: OK\n", fname);
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}
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}
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}
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}
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free(fname);
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}
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}
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}
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closedir(dd);
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} else {
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return -1;
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}
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(*reclev)--;
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return ret;
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}
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int scan(const char *filename, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt, int odesc, short contscan)
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{
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struct stat sb;
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int ret = 0, reclev = 0;
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const char *virname;
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/* check permissions */
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if(access(filename, R_OK)) {
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mdprintf(odesc, "%s: Can't access the file ERROR\n", filename);
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return -1;
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}
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/* stat file */
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if(lstat(filename, &sb) == -1) {
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mdprintf(odesc, "%s: Can't lstat() the file ERROR\n", filename);
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return -1;
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}
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switch(sb.st_mode & S_IFMT) {
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case S_IFLNK:
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if(!cfgopt(copt, "FollowFileSymlinks"))
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break;
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/* else go to the next case */
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case S_IFREG:
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if(sb.st_size == 0) { /* empty file */
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mdprintf(odesc, "%s: Empty file\n", filename);
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return 0;
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}
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ret = cl_scanfile(filename, &virname, scanned, root, limits, options);
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if(ret == CL_VIRUS) {
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mdprintf(odesc, "%s: %s FOUND\n", filename, virname);
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logg("%s: %s FOUND\n", filename, virname);
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virusaction(filename, virname, copt);
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} else if(ret != CL_CLEAN) {
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mdprintf(odesc, "%s: %s ERROR\n", filename, cl_strerror(ret));
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logg("%s: %s ERROR\n", filename, cl_strerror(ret));
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} else if (logok) {
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logg("%s: OK\n", filename);
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}
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break;
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case S_IFDIR:
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ret = dirscan(filename, &virname, scanned, root, limits, options, copt, odesc, &reclev, contscan);
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break;
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default:
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mdprintf(odesc, "%s: Not supported file type ERROR\n", filename);
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return -1;
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}
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if(!ret)
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mdprintf(odesc, "%s: OK\n", filename);
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return ret;
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}
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int scanstream(int odesc, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt)
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{
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int ret, portscan = CL_DEFAULT_MAXPORTSCAN, sockfd, port, acceptd, tmpd, bread, retval, timeout;
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long int size = 0, maxsize = 0;
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short bound = 0;
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const char *virname;
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char buff[FILEBUFF];
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struct sockaddr_in server;
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struct hostent *he;
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struct cfgstruct *cpt;
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FILE *tmp = NULL;
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while(!bound && portscan--) {
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if((port = cl_rndnum(60000)) < 1024)
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port += 2139;
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memset((char *) &server, 0, sizeof(server));
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server.sin_family = AF_INET;
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server.sin_port = htons(port);
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if((cpt = cfgopt(copt, "TCPAddr"))) {
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if ((he = gethostbyname(cpt->strarg)) == 0) {
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logg("!gethostbyname(%s) error: %s\n", cpt->strarg);
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mdprintf(odesc, "gethostbyname(%s) ERROR\n", cpt->strarg);
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return -1;
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}
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server.sin_addr = *(struct in_addr *) he->h_addr_list[0];
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} else
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server.sin_addr.s_addr = INADDR_ANY;
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if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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continue;
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if(bind(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) == -1)
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close(sockfd);
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else
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bound = 1;
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}
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if((cpt = cfgopt(copt, "ReadTimeout"))) {
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timeout = cpt->numarg;
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} else {
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timeout = CL_DEFAULT_SCANTIMEOUT;
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}
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if (timeout == 0) {
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timeout = -1;
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}
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if(!bound && !portscan) {
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logg("!ScanStream: Can't find any free port.\n");
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mdprintf(odesc, "Can't find any free port ERROR\n");
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return -1;
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} else {
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listen(sockfd, 1);
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mdprintf(odesc, "PORT %d\n", port);
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}
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retval = poll_fd(sockfd, timeout);
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switch (retval) {
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case 0: /* timeout */
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mdprintf(sockfd, "Accept timeout ERROR\n");
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logg("!ScanStream: accept timeout.\n");
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return -1;
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case -1:
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mdprintf(sockfd, "accept poll ERROR\n");
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logg("!ScanStream: accept poll failed.\n");
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return -1;
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}
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if((acceptd = accept(sockfd, NULL, NULL)) == -1) {
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close(sockfd);
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mdprintf(odesc, "accept() ERROR\n");
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logg("!ScanStream: accept() failed.\n");
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return -1;
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}
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logg("*Accepted connection on port %d, fd %d\n", port, acceptd);
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/* StreamSaveToDisk is enforced, to ensure timeoute */
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/*if(cfgopt(copt, "StreamSaveToDisk")) { */
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if((tmp = tmpfile()) == NULL) {
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shutdown(sockfd, 2);
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close(sockfd);
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close(acceptd);
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mdprintf(odesc, "Temporary file ERROR\n");
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logg("!ScanStream: Can't create temporary file.\n");
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return -1;
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}
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tmpd = fileno(tmp);
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if((cpt = cfgopt(copt, "StreamMaxLength")))
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maxsize = cpt->numarg;
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while((retval = poll_fd(acceptd, timeout)) == 1) {
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bread = read(acceptd, buff, sizeof(buff));
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if (bread <= 0) {
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break;
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}
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size += bread;
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if(maxsize && (size + sizeof(buff)) > maxsize) {
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shutdown(sockfd, 2);
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close(sockfd);
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close(acceptd);
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mdprintf(odesc, "Size exceeded ERROR\n");
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logg("^ScanStream: Size exceeded (stopped at %d, max: %d)\n", size, maxsize);
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if(tmp)
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fclose(tmp);
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return -1;
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}
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if(writen(tmpd, buff, bread) != bread) {
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shutdown(sockfd, 2);
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close(sockfd);
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close(acceptd);
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mdprintf(odesc, "Temporary file -> write ERROR\n");
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logg("!ScanStream: Can't write to temporary file.\n");
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if(tmp)
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fclose(tmp);
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return -1;
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}
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}
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lseek(tmpd, 0, SEEK_SET);
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ret = cl_scandesc(tmpd, &virname, scanned, root, limits, options);
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if(tmp)
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fclose(tmp);
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/* } else
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ret = cl_scandesc(acceptd, &virname, scanned, root, limits, 0);
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*/
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close(acceptd);
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close(sockfd);
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if(ret == CL_VIRUS) {
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mdprintf(odesc, "stream: %s FOUND\n", virname);
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logg("stream: %s FOUND\n", virname);
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virusaction("InputStream", virname, copt);
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} else if(ret != CL_CLEAN) {
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mdprintf(odesc, "stream: %s ERROR\n", cl_strerror(ret));
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logg("stream: %s ERROR\n", cl_strerror(ret));
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} else {
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mdprintf(odesc, "stream: OK\n");
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if (logok)
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logg("stream: OK\n");
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}
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return ret;
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}
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