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/* |
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* Copyright (C) 2002 - 2005 Tomasz Kojm <tkojm@clamav.net> |
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*
* 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 |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA. |
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*/
|
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#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
|
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h> |
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#include <errno.h> |
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#include <sys/stat.h>
#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 <sys/param.h> |
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#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h> |
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#include <arpa/inet.h>
#include <netdb.h> |
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#include <clamav.h> |
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#include <pthread.h> |
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|
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#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
#include <limits.h> |
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#include <stddef.h> |
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#endif
|
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#include "cfgparser.h" |
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#include "others.h"
#include "scanner.h" |
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#include "memory.h"
#include "shared.h"
#include "output.h" |
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#include "network.h" |
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|
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#include "../libclamav/others.h"
|
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#ifdef C_LINUX
dev_t procdev; /* /proc device */
#endif
|
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/* 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
|
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static int checksymlink(const char *path) |
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{
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 ;)) */ |
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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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{
DIR *dd;
struct dirent *dent; |
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#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2) |
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union {
struct dirent d;
char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
} result; |
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#endif |
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struct stat statbuf;
struct cfgstruct *cpt;
char *fname; |
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int ret = 0, scanret = 0, maxdirrec = 0; |
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|
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|
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maxdirrec = cfgopt(copt, "MaxDirectoryRecursion")->numarg; |
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if(maxdirrec) {
if(*reclev > maxdirrec) {
logg("*Directory recursion limit exceeded at %s\n", dirname);
return 0; |
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} |
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(*reclev)++; |
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}
if((dd = opendir(dirname)) != NULL) { |
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#ifdef HAVE_READDIR_R_3 |
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while(!readdir_r(dd, &result.d, &dent) && dent) { |
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#elif defined(HAVE_READDIR_R_2) |
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while((dent = (struct dirent *) readdir_r(dd, &result.d))) { |
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#else |
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while((dent = readdir(dd))) { |
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#endif |
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if (!is_fd_connected(odesc)) {
logg("Client disconnected\n");
closedir(dd);
return 1;
} |
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#ifndef C_INTERIX
if(dent->d_ino)
#endif
{ |
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if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* 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);
/* stat the file */
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")->enabled)) { |
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if(dirscan(fname, virname, scanned, root, limits, options, copt, odesc, reclev, contscan) == 1) {
free(fname);
closedir(dd);
return 1;
} |
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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")->enabled)) { |
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#ifdef C_LINUX |
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if(procdev && (statbuf.st_dev == procdev))
scanret = CL_CLEAN;
else |
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#endif |
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scanret = cl_scanfile(fname, virname, scanned, root, limits, options);
|
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if(scanret == CL_VIRUS) {
|
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mdprintf(odesc, "%s: %s FOUND\n", fname, *virname);
logg("%s: %s FOUND\n", fname, *virname); |
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virusaction(fname, *virname, copt); |
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if(!contscan) {
closedir(dd);
free(fname);
return 1;
} else
ret = 2; |
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|
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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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if(scanret == CL_EMEM) {
closedir(dd);
free(fname);
return -2;
}
|
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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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}
free(fname);
}
}
} |
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closedir(dd); |
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} 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; |
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const char *virname; |
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/* stat file */
if(lstat(filename, &sb) == -1) { |
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mdprintf(odesc, "%s: lstat() failed. ERROR\n", filename); |
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return -1;
}
|
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/* check permissions */
if(access(filename, R_OK)) {
mdprintf(odesc, "%s: Access denied. ERROR\n", filename);
return -1;
}
|
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switch(sb.st_mode & S_IFMT) {
case S_IFLNK: |
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if(!cfgopt(copt, "FollowFileSymlinks")->enabled) |
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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;
} |
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#ifdef C_LINUX |
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if(procdev && (sb.st_dev == procdev))
ret = CL_CLEAN;
else |
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#endif |
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ret = cl_scanfile(filename, &virname, scanned, root, limits, options); |
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|
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if(ret == CL_VIRUS) {
mdprintf(odesc, "%s: %s FOUND\n", filename, virname);
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));
logg("%s: %s ERROR\n", filename, cl_strerror(ret)); |
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if(ret == CL_EMEM)
return -2; |
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} else if (logok) {
logg("%s: OK\n", filename);
} |
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break;
case S_IFDIR:
ret = dirscan(filename, &virname, scanned, root, limits, options, copt, odesc, &reclev, contscan);
break;
default: |
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mdprintf(odesc, "%s: Not supported file type. ERROR\n", filename); |
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return -1;
}
if(!ret)
mdprintf(odesc, "%s: OK\n", filename);
return ret;
}
|
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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; |
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char fdstr[32]; |
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if(fstat(fd, &statbuf) == -1)
return -1;
if(!S_ISREG(statbuf.st_mode))
return -1;
|
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snprintf(fdstr, sizeof(fdstr), "fd[%d]", fd);
|
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ret = cl_scandesc(fd, &virname, scanned, root, limits, options);
if(ret == CL_VIRUS) { |
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mdprintf(odesc, "%s: %s FOUND\n", fdstr, virname);
logg("%s: %s FOUND\n", fdstr, virname);
virusaction(fdstr, virname, copt); |
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} else if(ret != CL_CLEAN) { |
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mdprintf(odesc, "%s: %s ERROR\n", fdstr, cl_strerror(ret));
logg("%s: %s ERROR\n", fdstr, cl_strerror(ret)); |
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} else { |
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mdprintf(odesc, "%s: OK\n", fdstr); |
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if(logok) |
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logg("%s: OK\n", fdstr); |
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}
return ret;
}
|
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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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int ret, portscan = 1000, sockfd, port = 0, acceptd; |
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int tmpd, bread, retval, timeout, btread, min_port, max_port; |
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long int size = 0, maxsize = 0; |
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short bound = 0, rnd_port_first = 1; |
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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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char *tmpname; |
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|
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|
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/* get min port */ |
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min_port = cfgopt(copt, "StreamMinPort")->numarg;
if(min_port < 1024 || min_port > 65535) |
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min_port = 1024;
/* get max port */ |
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max_port = cfgopt(copt, "StreamMaxPort")->numarg;
if(max_port < min_port || max_port > 65535)
max_port = 65535; |
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/* bind to a free port */ |
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while(!bound && --portscan) { |
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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;
} |
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memset((char *) &server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(port); |
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|
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if((cpt = cfgopt(copt, "TCPAddr"))->enabled) { |
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if(r_gethostbyname(cpt->strarg, &he, buff, sizeof(buff)) == -1) {
logg("!r_gethostbyname(%s) error: %s\n", cpt->strarg, strerror(errno));
mdprintf(odesc, "r_gethostbyname(%s) ERROR\n", cpt->strarg); |
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return -1;
} |
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server.sin_addr = *(struct in_addr *) he.h_addr_list[0]; |
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} else
server.sin_addr.s_addr = INADDR_ANY; |
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if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
continue;
if(bind(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) == -1)
close(sockfd);
else |
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bound = 1; |
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} |
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|
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timeout = cfgopt(copt, "ReadTimeout")->numarg; |
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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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close(sockfd); |
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return -1;
} else {
listen(sockfd, 1); |
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if(mdprintf(odesc, "PORT %d\n", port) <= 0) {
logg("!ScanStream: error transmitting port.\n");
close(sockfd);
return -1;
} |
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}
|
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switch(retval = poll_fd(sockfd, timeout)) {
case 0: /* timeout */ |
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mdprintf(odesc, "Accept timeout. ERROR\n"); |
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logg("!ScanStream %d: accept timeout.\n", port); |
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close(sockfd);
return -1;
case -1: |
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mdprintf(odesc, "Accept poll. ERROR\n"); |
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logg("!ScanStream %d: accept poll failed.\n", port); |
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close(sockfd);
return -1; |
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}
|
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if((acceptd = accept(sockfd, NULL, NULL)) == -1) {
close(sockfd);
mdprintf(odesc, "accept() ERROR\n"); |
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logg("!ScanStream %d: accept() failed.\n", port); |
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return -1;
}
|
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logg("*Accepted connection on port %d, fd %d\n", port, acceptd); |
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|
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if ((tmpname = cli_gentempdesc(NULL, &tmpd)) == NULL) { |
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shutdown(sockfd, 2);
close(sockfd);
close(acceptd); |
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mdprintf(odesc, "tempfile() failed. ERROR\n"); |
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logg("!ScanStream %d: Can't create temporary file.\n", port); |
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return -1;
}
|
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maxsize = cfgopt(copt, "StreamMaxLength")->numarg; |
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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) { |
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shutdown(sockfd, 2);
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 %d: Can't write to temporary file.\n", port);
close(tmpd); |
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if(!cfgopt(copt, "LeaveTemporaryFiles")->enabled) |
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unlink(tmpname);
free(tmpname); |
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return -1;
}
|
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if(maxsize && (size + btread >= maxsize)) {
btread = (maxsize - size); /* only read up to max */ |
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|
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if(btread <= 0) { |
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logg("^ScanStream %d: Size limit reached (max: %d)\n", port, maxsize); |
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break; /* Scan what we have */ |
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} |
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} |
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} |
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|
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switch(retval) {
case 0: /* timeout */ |
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mdprintf(odesc, "read timeout ERROR\n"); |
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logg("!ScanStream %d: read timeout.\n", port);
break; |
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case -1: |
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mdprintf(odesc, "read poll ERROR\n"); |
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logg("!ScanStream %d: read poll failed.\n", port);
break; |
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} |
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|
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if(retval == 1) {
lseek(tmpd, 0, SEEK_SET);
ret = cl_scandesc(tmpd, &virname, scanned, root, limits, options);
} else {
ret = -1;
} |
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close(tmpd); |
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if(!cfgopt(copt, "LeaveTemporaryFiles")->enabled) |
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unlink(tmpname);
free(tmpname); |
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close(acceptd);
close(sockfd);
if(ret == CL_VIRUS) {
mdprintf(odesc, "stream: %s FOUND\n", virname); |
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logg("stream %d: %s FOUND\n", port, virname); |
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virusaction("stream", virname, copt); |
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} else if(ret != CL_CLEAN) { |
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if(retval == 1) {
mdprintf(odesc, "stream: %s ERROR\n", cl_strerror(ret));
logg("stream %d: %s ERROR\n", port, 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 %d: OK\n", port); |
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} |
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return ret;
} |