/*
* Copyright (C) 2002 - 2005 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.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <clamav.h>
#include <pthread.h>
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
#include <limits.h>
#include <stddef.h>
#endif
#include "cfgparser.h"
#include "others.h"
#include "scanner.h"
#include "defaults.h"
#include "memory.h"
#include "shared.h"
#include "output.h"
#include "../libclamav/others.h"
#ifdef C_LINUX
dev_t procdev; /* /proc device */
#endif
/* Maximum filenames under various systems - njh */
#ifndef NAME_MAX /* e.g. Linux */
# ifdef MAXNAMELEN /* e.g. Solaris */
# define NAME_MAX MAXNAMELEN
# else
# ifdef FILENAME_MAX /* e.g. SCO */
# define NAME_MAX FILENAME_MAX
# endif
# endif
#endif
pthread_mutex_t gh_mutex = PTHREAD_MUTEX_INITIALIZER;
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, 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)
{
DIR *dd;
struct dirent *dent;
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
union {
struct dirent d;
char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
} result;
#endif
struct stat statbuf;
struct cfgstruct *cpt;
char *fname;
int ret = 0, scanret = 0, maxdirrec = 0;
if((cpt = cfgopt(copt, "MaxDirectoryRecursion")))
maxdirrec = cpt->numarg;
else
maxdirrec = CL_DEFAULT_MAXDIRREC;
if(maxdirrec) {
if(*reclev > maxdirrec) {
logg("*Directory recursion limit exceeded at %s\n", dirname);
return 0;
}
(*reclev)++;
}
if((dd = opendir(dirname)) != NULL) {
#ifdef HAVE_READDIR_R_3
while(!readdir_r(dd, &result.d, &dent) && dent) {
#elif defined(HAVE_READDIR_R_2)
while((dent = (struct dirent *) readdir_r(dd, &result.d))) {
#else
while((dent = readdir(dd))) {
#endif
if (!is_fd_connected(odesc)) {
logg("Client disconnected\n");
closedir(dd);
return 1;
}
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fname = (char *) 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"))) {
#ifdef C_LINUX
if(procdev && (statbuf.st_dev == procdev))
scanret = CL_CLEAN;
else
#endif
scanret = cl_scanfile(fname, virname, scanned, root, limits, options);
if(scanret == 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));
if(scanret == CL_EMEM) {
closedir(dd);
free(fname);
return -2;
}
} 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;
unsigned int reclev = 0;
const char *virname;
/* stat file */
if(lstat(filename, &sb) == -1) {
mdprintf(odesc, "%s: lstat() failed. ERROR\n", filename);
return -1;
}
/* check permissions */
if(access(filename, R_OK)) {
mdprintf(odesc, "%s: Access denied. 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;
}
#ifdef C_LINUX
if(procdev && (sb.st_dev == procdev))
ret = CL_CLEAN;
else
#endif
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));
if(ret == CL_EMEM)
return -2;
} 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 scanfd(const int fd, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt, int odesc, short contscan)
{
int ret;
const char *virname;
struct stat statbuf;
char fdstr[32];
if(fstat(fd, &statbuf) == -1)
return -1;
if(!S_ISREG(statbuf.st_mode))
return -1;
snprintf(fdstr, sizeof(fdstr), "fd[%d]", fd);
ret = cl_scandesc(fd, &virname, scanned, root, limits, options);
if(ret == CL_VIRUS) {
mdprintf(odesc, "%s: %s FOUND\n", fdstr, virname);
logg("%s: %s FOUND\n", fdstr, virname);
virusaction(fdstr, virname, copt);
} else if(ret != CL_CLEAN) {
mdprintf(odesc, "%s: %s ERROR\n", fdstr, cl_strerror(ret));
logg("%s: %s ERROR\n", fdstr, cl_strerror(ret));
} else {
mdprintf(odesc, "%s: OK\n", fdstr);
if(logok)
logg("%s: OK\n", fdstr);
}
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 = 0, acceptd;
int tmpd, bread, retval, timeout, btread, min_port, max_port;
long int size = 0, maxsize = 0;
short bound = 0, rnd_port_first = 1;
const char *virname;
char buff[FILEBUFF];
struct sockaddr_in server;
struct hostent *he;
struct cfgstruct *cpt;
FILE *tmp = NULL;
/* get min port */
if((cpt = cfgopt(copt, "StreamMinPort"))) {
if(cpt->numarg < 1024 || cpt->numarg > 65535)
min_port = 1024;
else
min_port = cpt->numarg;
} else
min_port = 1024;
/* get max port */
if((cpt = cfgopt(copt, "StreamMaxPort"))) {
if(cpt->numarg < min_port || cpt->numarg > 65535)
max_port = 65535;
else
max_port = cpt->numarg;
} else
max_port = 2048;
/* bind to a free port */
while(!bound && --portscan) {
if(rnd_port_first) {
/* try a random port first */
port = min_port + cli_rndnum(max_port - min_port + 1);
rnd_port_first = 0;
} else {
/* try the neighbor ports */
if(--port < min_port)
port=max_port;
}
memset((char *) &server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(port);
if((cpt = cfgopt(copt, "TCPAddr"))) {
pthread_mutex_lock(&gh_mutex);
if((he = gethostbyname(cpt->strarg)) == 0) {
logg("!gethostbyname(%s) error: %s\n", cpt->strarg);
mdprintf(odesc, "gethostbyname(%s) ERROR\n", cpt->strarg);
pthread_mutex_unlock(&gh_mutex);
return -1;
}
server.sin_addr = *(struct in_addr *) he->h_addr_list[0];
pthread_mutex_unlock(&gh_mutex);
} else
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((cpt = cfgopt(copt, "ReadTimeout")))
timeout = cpt->numarg;
else
timeout = CL_DEFAULT_SCANTIMEOUT;
if(timeout == 0)
timeout = -1;
if(!bound && !portscan) {
logg("!ScanStream: Can't find any free port.\n");
mdprintf(odesc, "Can't find any free port. ERROR\n");
close(sockfd);
return -1;
} else {
listen(sockfd, 1);
mdprintf(odesc, "PORT %d\n", port);
}
switch(retval = poll_fd(sockfd, timeout)) {
case 0: /* timeout */
mdprintf(odesc, "Accept timeout. ERROR\n");
logg("!ScanStream: accept timeout.\n");
close(sockfd);
return -1;
case -1:
mdprintf(odesc, "Accept poll. ERROR\n");
logg("!ScanStream: accept poll failed.\n");
close(sockfd);
return -1;
}
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((tmp = tmpfile()) == NULL) {
shutdown(sockfd, 2);
close(sockfd);
close(acceptd);
mdprintf(odesc, "tempfile() failed. ERROR\n");
logg("!ScanStream: Can't create temporary file.\n");
return -1;
}
tmpd = fileno(tmp);
if((cpt = cfgopt(copt, "StreamMaxLength")))
maxsize = cpt->numarg;
else
maxsize = CL_DEFAULT_STREAMMAXLEN;
btread = sizeof(buff);
while((retval = poll_fd(acceptd, timeout)) == 1) {
bread = read(acceptd, buff, btread);
if(bread <= 0)
break;
size += bread;
if(writen(tmpd, buff, bread) != bread) {
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);
close(tmpd);
return -1;
}
if(maxsize && (size + btread >= maxsize)) {
btread = (maxsize - size); /* only read up to max */
if(btread <= 0) {
logg("^ScanStream: Size limit reached ( max: %d)\n", maxsize);
break; /* Scan what we have */
}
}
}
switch(retval) {
case 0: /* timeout */
mdprintf(odesc, "read timeout ERROR\n");
logg("!ScanStream: read timeout.\n");
break;
case -1:
mdprintf(odesc, "read poll ERROR\n");
logg("!ScanStream: read poll failed.\n");
break;
}
lseek(tmpd, 0, SEEK_SET);
ret = cl_scandesc(tmpd, &virname, scanned, root, limits, options);
if(tmp)
fclose(tmp);
close(acceptd);
close(sockfd);
if(ret == CL_VIRUS) {
mdprintf(odesc, "stream: %s FOUND\n", virname);
logg("stream: %s FOUND\n", virname);
virusaction("stream", 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;
}