/*
* Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <clamav.h>
#include "cfgfile.h"
#include "others.h"
#include "scanner.h"
#include "defaults.h"
int checksymlink(const char *path)
{
struct stat statbuf;
if(stat(path, &statbuf) == -1)
return -1;
if(S_ISDIR(statbuf.st_mode))
return 1;
if(S_ISREG(statbuf.st_mode))
return 2;
return 0;
}
/* :set nowrap, if you don't like this style ;)) */
int dirscan(const char *dirname, 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)
{
DIR *dd;
struct dirent *dent;
struct stat statbuf;
struct cfgstruct *cpt;
char *fname;
int ret = 0, scanret = 0;
if((cpt = cfgopt(copt, "MaxDirectoryRecursion"))) {
if(cpt->numarg) {
if(*reclev > cpt->numarg) {
logg("*Directory recursion limit exceeded at %s\n", dirname);
return 0;
}
(*reclev)++;
}
}
if((dd = opendir(dirname)) != NULL) {
while((dent = readdir(dd))) {
if(dent->d_ino) {
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fname = mcalloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
sprintf(fname, "%s/%s", dirname, dent->d_name);
/* stat the file */
if(lstat(fname, &statbuf) != -1) {
if((S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) || (S_ISLNK(statbuf.st_mode) && (checksymlink(fname) == 1) && cfgopt(copt, "FollowDirectorySymlinks"))) {
if(dirscan(fname, virname, scanned, root, limits, options, copt, odesc, reclev, contscan) == 1) {
free(fname);
closedir(dd);
return 1;
}
} else {
if(S_ISREG(statbuf.st_mode) || (S_ISLNK(statbuf.st_mode) && (checksymlink(fname) == 2) && cfgopt(copt, "FollowFileSymlinks"))) {
if((scanret = cl_scanfile(fname, virname, scanned, root, limits, options)) == CL_VIRUS) {
mdprintf(odesc, "%s: %s FOUND\n", fname, *virname);
logg("%s: %s FOUND\n", fname, *virname);
virusaction(fname, *virname, copt);
if(!contscan) {
closedir(dd);
free(fname);
return 1;
} else
ret = 2;
} else if(scanret != CL_CLEAN) {
mdprintf(odesc, "%s: %s ERROR\n", fname, cl_strerror(scanret));
logg("%s: %s ERROR\n", fname, cl_strerror(scanret));
} else if (logok) {
logg("%s: OK\n", fname);
}
}
}
}
free(fname);
}
}
}
closedir(dd);
} else {
return -1;
}
(*reclev)--;
return ret;
}
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)
{
struct stat sb;
int ret = 0, reclev = 0;
char *virname;
/* check permissions */
if(access(filename, R_OK)) {
mdprintf(odesc, "%s: Can't access the file ERROR\n", filename);
return -1;
}
/* stat file */
if(lstat(filename, &sb) == -1) {
mdprintf(odesc, "%s: Can't lstat() the file ERROR\n", filename);
return -1;
}
switch(sb.st_mode & S_IFMT) {
case S_IFLNK:
if(!cfgopt(copt, "FollowFileSymlinks"))
break;
/* else go to the next case */
case S_IFREG:
if(sb.st_size == 0) { /* empty file */
mdprintf(odesc, "%s: Empty file\n", filename);
return 0;
}
ret = cl_scanfile(filename, &virname, scanned, root, limits, options);
if(ret == CL_VIRUS) {
mdprintf(odesc, "%s: %s FOUND\n", filename, virname);
logg("%s: %s FOUND\n", filename, virname);
virusaction(filename, virname, copt);
} else if(ret != CL_CLEAN) {
mdprintf(odesc, "%s: %s ERROR\n", filename, cl_strerror(ret));
logg("%s: %s ERROR\n", filename, cl_strerror(ret));
} else if (logok) {
logg("%s: OK\n", filename);
}
break;
case S_IFDIR:
ret = dirscan(filename, &virname, scanned, root, limits, options, copt, odesc, &reclev, contscan);
break;
default:
mdprintf(odesc, "%s: Not supported file type ERROR\n", filename);
return -1;
}
if(!ret)
mdprintf(odesc, "%s: OK\n", filename);
return ret;
}
int scanstream(int odesc, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt)
{
int ret, portscan = CL_DEFAULT_MAXPORTSCAN, sockfd, port, acceptd, tmpd, bread;
long int size = 0, maxsize = 0;
short bound = 0;
char *virname, buff[32768];
struct sockaddr_in server;
struct cfgstruct *cpt;
FILE *tmp = NULL;
while(!bound && portscan--) {
if((port = cl_rndnum(60000)) < 1024)
port += 2139;
memset((char *) &server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(port);
server.sin_addr.s_addr = INADDR_ANY;
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
continue;
if(bind(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) == -1)
close(sockfd);
else
bound = 1;
}
if(!bound && !portscan) {
mdprintf(odesc, "ERROR\n");
logg("!ScanStream: Can't find any free port.\n");
return -1;
} else {
listen(sockfd, 1);
mdprintf(odesc, "PORT %d\n", port);
}
if((acceptd = accept(sockfd, NULL, NULL)) == -1) {
close(sockfd);
mdprintf(odesc, "accept() ERROR\n");
logg("!ScanStream: accept() failed.\n");
return -1;
}
logg("*Accepted connection on port %d, fd %d\n", port, acceptd);
if(cfgopt(copt, "StreamSaveToDisk")) {
if((tmp = tmpfile()) == NULL) {
shutdown(sockfd, 2);
close(sockfd);
close(acceptd);
mdprintf(odesc, "Temporary file ERROR\n");
logg("!ScanStream: Can't create temporary file.\n");
return -1;
}
tmpd = fileno(tmp);
if((cpt = cfgopt(copt, "StreamMaxLength")))
maxsize = cpt->numarg;
while((bread = read(acceptd, buff, sizeof(buff))) > 0) {
size += bread;
if(maxsize && (size + sizeof(buff)) > maxsize) {
shutdown(sockfd, 2);
close(sockfd);
close(acceptd);
mdprintf(odesc, "Size exceeded ERROR\n");
logg("^ScanStream: Size exceeded (stopped at %d, max: %d)\n", size, maxsize);
if(tmp)
fclose(tmp);
return -1;
}
if(write(tmpd, buff, bread) < 0) {
shutdown(sockfd, 2);
close(sockfd);
close(acceptd);
mdprintf(odesc, "Temporary file -> write ERROR\n");
logg("!ScanStream: Can't write to temporary file.\n");
if(tmp)
fclose(tmp);
return -1;
}
}
lseek(tmpd, 0, SEEK_SET);
ret = cl_scandesc(tmpd, &virname, scanned, root, limits, options);
if(tmp)
fclose(tmp);
} else
ret = cl_scandesc(acceptd, &virname, scanned, root, limits, 0);
close(acceptd);
close(sockfd);
if(ret == CL_VIRUS) {
mdprintf(odesc, "stream: %s FOUND\n", virname);
logg("stream: %s FOUND\n", virname);
virusaction("InputStream", virname, copt);
} else if(ret != CL_CLEAN) {
mdprintf(odesc, "stream: %s ERROR\n", cl_strerror(ret));
logg("stream: %s ERROR\n", cl_strerror(ret));
} else {
mdprintf(odesc, "stream: OK\n");
if (logok)
logg("stream: OK\n");
}
return ret;
}