/*

  *  Copyright (C) 2002 - 2006 Tomasz Kojm <tkojm@clamav.net>

  *  HTTP/1.1 compliance by Arkadiusz Miskiewicz <misiek@pld.org.pl>
  *  Proxy support by Nigel Horne <njh@bandsman.co.uk>
  *  Proxy authorization support by Gernot Tenchio <g.tenchio@telco-tech.de>
  *		     (uses fmt_base64() from libowfat (http://www.fefe.de))

  *  CDIFF code (C) 2006 Sensory Networks, Inc.

  *
  *  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., 51 Franklin Street, Fifth Floor, Boston,
  *  MA 02110-1301, USA.

  */

  
 #ifdef	_MSC_VER
 #include <winsock.h>	/* only needed in CL_EXPERIMENTAL */
 #endif

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include <stdio.h>
 #include <stdlib.h>

 #ifdef	HAVE_UNISTD_H

 #include <unistd.h>

 #endif

 #include <string.h>
 #include <ctype.h>

 #ifndef	C_WINDOWS

 #include <netinet/in.h>
 #include <netdb.h>

 #endif

 #include <sys/types.h>

 #ifndef	C_WINDOWS

 #include <sys/socket.h>
 #include <sys/time.h>

 #endif

 #include <time.h>
 #include <fcntl.h>
 #include <sys/stat.h>

 #include <errno.h>

 
 #include "manager.h"
 #include "notify.h"

 #include "dns.h"

 #include "execute.h"

 #include "nonblock.h"

 #include "mirman.h"

 #include "shared/options.h"
 #include "shared/cfgparser.h"
 #include "shared/output.h"
 #include "shared/misc.h"
 #include "shared/cdiff.h"

 #include "libclamav/clamav.h"

 #include "libclamav/others.h"
 #include "libclamav/str.h"
 #include "libclamav/cvd.h"

 #include "libclamav/lockdb.h"

 #ifndef	O_BINARY
 #define	O_BINARY	0

 #endif
 

 #ifndef	C_WINDOWS
 #define	closesocket(s)	close(s)
 #endif

 static int getclientsock(const char *localip)

 {

 	int socketfd = -1;

 #ifdef PF_INET
     socketfd = socket(PF_INET, SOCK_STREAM, 0);
 #else
     socketfd = socket(AF_INET, SOCK_STREAM, 0);
 #endif
 
     if(socketfd < 0) {
 	logg("!Can't create new socket\n");
 	return -1;
     }
 

     if(localip) {

 	struct hostent *he;
 

 	if((he = gethostbyname(localip)) == NULL) {

 	    const char *herr;

 	    switch(h_errno) {
 	        case HOST_NOT_FOUND:
 		    herr = "Host not found";
 		    break;
 
 		case NO_DATA:
 		    herr = "No IP address";
 		    break;
 
 		case NO_RECOVERY:
 		    herr = "Unrecoverable DNS error";
 		    break;
 
 		case TRY_AGAIN:
 		    herr = "Temporary DNS error";
 		    break;
 
 		default:
 		    herr = "Unknown error";
 		    break;
 	    }

 	    logg("!Could not resolve local ip address '%s': %s\n", localip, herr);
 	    logg("^Using standard local ip address and port for fetching.\n");

 	} else {
 	    struct sockaddr_in client;

 	    unsigned char *ia;
 	    char ipaddr[16];
 

 	    memset ((char *) &client, 0, sizeof(struct sockaddr_in));
 	    client.sin_family = AF_INET;
 	    client.sin_addr = *(struct in_addr *) he->h_addr_list[0];
 	    if (bind(socketfd, (struct sockaddr *) &client, sizeof(struct sockaddr_in)) != 0) {

 		logg("!Could not bind to local ip address '%s': %s\n", localip, strerror(errno));
 		logg("^Using default client ip.\n");

 	    } else {
 		ia = (unsigned char *) he->h_addr_list[0];
 		sprintf(ipaddr, "%u.%u.%u.%u", ia[0], ia[1], ia[2], ia[3]);

 		logg("*Using ip '%s' for fetching.\n", ipaddr);

 	    }
 	}
     }

 
     return socketfd;
 }
 
 static int wwwconnect(const char *server, const char *proxy, int pport, char *ip, const char *localip, int ctimeout, struct mirdat *mdat)
 {
 	int socketfd = -1, port, i, ret;
 	struct sockaddr_in name;
 	struct hostent *host;
 	char ipaddr[16];
 	unsigned char *ia;
 	const char *hostpt;
 
     if(ip)
 	strcpy(ip, "???");
 
     socketfd = getclientsock(localip);
     if(socketfd < 0)
 	return -1;
 
     name.sin_family = AF_INET;
 

     if(proxy) {

 	hostpt = proxy;
 
 	if(!(port = pport)) {

 #ifndef C_CYGWIN
 		const struct servent *webcache = getservbyname("webcache", "TCP");
 
 		if(webcache)
 			port = ntohs(webcache->s_port);
 		else
 			port = 8080;
 

 #ifndef	C_WINDOWS

 		endservent();

 #endif

 #else
 		port = 8080;
 #endif
 	}

     } else {
 	hostpt = server;
 	port = 80;
     }
 
     if((host = gethostbyname(hostpt)) == NULL) {

 	const char *herr;

 	switch(h_errno) {
 	    case HOST_NOT_FOUND:
 		herr = "Host not found";
 		break;
 
 	    case NO_DATA:
 		herr = "No IP address";
 		break;
 
 	    case NO_RECOVERY:
 		herr = "Unrecoverable DNS error";
 		break;
 
 	    case TRY_AGAIN:
 		herr = "Temporary DNS error";
 		break;
 
 	    default:
 		herr = "Unknown error";
 		break;
 	}

         logg("!Can't get information about %s: %s\n", hostpt, herr);

 	close(socketfd);

 	return -1;
     }
 

     for(i = 0; host->h_addr_list[i] != 0; i++) {
 	/* this dirty hack comes from pink - Nosuid TCP/IP ping 1.6 */
 	ia = (unsigned char *) host->h_addr_list[i];
 	sprintf(ipaddr, "%u.%u.%u.%u", ia[0], ia[1], ia[2], ia[3]);

 	if((ret = mirman_check(((struct in_addr *) ia)->s_addr, mdat))) {
 	    if(ret == 1)
 		logg("Ignoring mirror %s (due to previous errors)\n", ipaddr);
 	    else
 		logg("Ignoring mirror %s (too often connections with outdated version)\n", ipaddr);
 	    continue;
 	}
 

 	if(ip)
 	    strcpy(ip, ipaddr);
 
 	if(i > 0)

 	    logg("Trying host %s (%s)...\n", hostpt, ipaddr);

 	name.sin_addr = *((struct in_addr *) host->h_addr_list[i]);
 	name.sin_port = htons(port);
 

 #ifdef SO_ERROR

 	if(wait_connect(socketfd, (struct sockaddr *) &name, sizeof(struct sockaddr_in), ctimeout) == -1) {

 #else
 	if(connect(socketfd, (struct sockaddr *) &name, sizeof(struct sockaddr_in)) == -1) {
 #endif

 	    logg("Can't connect to port %d of host %s (IP: %s)\n", port, hostpt, ipaddr);

 	    close(socketfd);
 	    if((socketfd = getclientsock(localip)) == -1)
 		return -1;
 

 	    continue;

 	} else {

 	    mdat->currip = ((struct in_addr *) ia)->s_addr;

 	    return socketfd;

 	}

     }
 

     close(socketfd);

     return -2;

 }
 

 static int Rfc2822DateTime(char *buf, time_t mtime)

 {

 	struct tm *gmt;

     gmt = gmtime(&mtime);
     return strftime(buf, 36, "%a, %d %b %Y %X GMT", gmt);

 }
 

 static unsigned int fmt_base64(char *dest, const char *src, unsigned int len)

 {

 	unsigned short bits = 0,temp = 0;
 	unsigned long written = 0;
 	unsigned int i;
 	const char base64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
 
     for(i = 0; i < len; i++) {
 	temp <<= 8;
 	temp += src[i];
 	bits += 8;
 	while(bits > 6) {
 	    dest[written] = base64[((temp >> (bits - 6)) & 63)];
 	    written++;
 	    bits -= 6;
 	}
     }
 
     if(bits) {
 	temp <<= (6 - bits);
 	dest[written] = base64[temp & 63];
 	written++;
     }
 
     while(written & 3) {
 	dest[written] = '=';
 	written++;
     }
 
     return written;
 }
 
 static char *proxyauth(const char *user, const char *pass)
 {
 	int len;
 	char *buf, *userpass, *auth;
 
 

     userpass = malloc(strlen(user) + strlen(pass) + 2);

     if(!userpass) {
 	logg("!proxyauth: Can't allocate memory for 'userpass'\n");
 	return NULL;
     }
     sprintf(userpass, "%s:%s", user, pass);
 

     buf = malloc((strlen(pass) + strlen(user)) * 2 + 4);

     if(!buf) {
 	logg("!proxyauth: Can't allocate memory for 'buf'\n");
 	free(userpass);
 	return NULL;
     }
 
     len = fmt_base64(buf, userpass, strlen(userpass));
     free(userpass);
     buf[len] = '\0';

     auth = malloc(strlen(buf) + 30);

     if(!auth) {
 	logg("!proxyauth: Can't allocate memory for 'authorization'\n");
 	return NULL;
     }
 
     sprintf(auth, "Proxy-Authorization: Basic %s\r\n", buf);
     free(buf);
 
     return auth;
 }
 

 static struct cl_cvd *remote_cvdhead(const char *file, const char *hostname, char *ip, const char *localip, const char *proxy, int port, const char *user, const char *pass, const char *uas, int *ims, int ctimeout, int rtimeout, struct mirdat *mdat)

 {
 	char cmd[512], head[513], buffer[FILEBUFF], ipaddr[16], *ch, *tmp;
 	int bread, cnt, sd;
 	unsigned int i, j;

 	char *remotename = NULL, *authorization = NULL;

 	const char *agent;

 	struct cl_cvd *cvd;

 	char last_modified[36];
 	struct stat sb;
 

 
     if(proxy) {

         remotename = malloc(strlen(hostname) + 8);

 	if(!remotename) {
 	    logg("!remote_cvdhead: Can't allocate memory for 'remotename'\n");
 	    return NULL;
 	}

         sprintf(remotename, "http://%s", hostname);
 

 	if(user) {
 	    authorization = proxyauth(user, pass);
 	    if(!authorization)
 		return NULL;
 	}

     }
 

     if(stat(file, &sb) != -1 && sb.st_mtime < time(NULL)) {

 	Rfc2822DateTime(last_modified, sb.st_mtime);
     } else {
 	    time_t mtime = 1104119530;

 	Rfc2822DateTime(last_modified, mtime);

 	logg("*Assuming modification time in the past\n");

     }

     logg("*If-Modified-Since: %s\n", last_modified);

     logg("Reading CVD header (%s): ", file);

 
     if(uas)
 	agent = uas;
     else

 #ifdef CL_EXPERIMENTAL
 	agent = PACKAGE"/"VERSION"-exp";
 #else

 	agent = PACKAGE"/"VERSION;

 #endif

     snprintf(cmd, sizeof(cmd),
 	"GET %s/%s HTTP/1.1\r\n"

 	"Host: %s\r\n%s"

 	"User-Agent: %s\r\n"

 	"Connection: close\r\n"
 	"Range: bytes=0-511\r\n"

         "If-Modified-Since: %s\r\n"

         "\r\n", (remotename != NULL) ? remotename : "", file, hostname, (authorization != NULL) ? authorization : "", agent, last_modified);

 
     free(remotename);
     free(authorization);
 

     memset(ipaddr, 0, sizeof(ipaddr));
 
     if(ip[0]) /* use ip to connect */

 	sd = wwwconnect(ip, proxy, port, ipaddr, localip, ctimeout, mdat);

     else

 	sd = wwwconnect(hostname, proxy, port, ipaddr, localip, ctimeout, mdat);

 
     if(sd < 0) {
 	return NULL;
     } else {
 	logg("*Connected to %s (IP: %s).\n", hostname, ipaddr);
 	logg("*Trying to retrieve CVD header of http://%s/%s\n", hostname, file);
     }
 
     if(!ip[0])
 	strcpy(ip, ipaddr);
 

     if(send(sd, cmd, strlen(cmd), 0) < 0) {

 	logg("!remote_cvdhead: write failed\n");

 	closesocket(sd);

 	return NULL;
     }
 

     tmp = buffer;

     cnt = FILEBUFF;

 #ifdef SO_ERROR

     while((bread = wait_recv(sd, tmp, cnt, 0, rtimeout)) > 0) {

 #else
     while((bread = recv(sd, tmp, cnt, 0)) > 0) {
 #endif

 	tmp += bread;
 	cnt -= bread;
 	if(cnt <= 0)
 	    break;

     }

     closesocket(sd);

 
     if(bread == -1) {

 	logg("!remote_cvdhead: Error while reading CVD header from %s\n", hostname);

 	mirman_update(mdat->currip, mdat, 1);

 	return NULL;
     }
 

     if((strstr(buffer, "HTTP/1.1 404")) != NULL || (strstr(buffer, "HTTP/1.0 404")) != NULL) { 

 	logg("!CVD file not found on remote server\n");

 	/* mirman_update(mdat->currip, mdat, 1); */

 	return NULL;
     }
 
     /* check whether the resource is up-to-date */

     if((strstr(buffer, "HTTP/1.1 304")) != NULL || (strstr(buffer, "HTTP/1.0 304")) != NULL) { 

 	*ims = 0;

 	logg("OK (IMS)\n");

 	mirman_update(mdat->currip, mdat, 0);

 	return NULL;
     } else {
 	*ims = 1;

     }
 

     if(!strstr(buffer, "HTTP/1.1 200") && !strstr(buffer, "HTTP/1.0 200") &&
        !strstr(buffer, "HTTP/1.1 206") && !strstr(buffer, "HTTP/1.0 206")) {
 	logg("!Unknown response from remote server\n");

 	mirman_update(mdat->currip, mdat, 1);

 	return NULL;
     }
 

     i = 3;
     ch = buffer + i;
     while(i < sizeof(buffer)) {

 	if (*ch == '\n' && *(ch - 1) == '\r' && *(ch - 2) == '\n' && *(ch - 3) == '\r') {
 	    ch++;
 	    i++;
 	    break;
 	}

 	ch++;
 	i++;

     }
 
     if(sizeof(buffer) - i < 512) {

 	logg("!remote_cvdhead: Malformed CVD header (too short)\n");

 	mirman_update(mdat->currip, mdat, 1);

 	return NULL;
     }

     memset(head, 0, sizeof(head));
 

     for(j = 0; j < 512; j++) {
 	if(!ch || (ch && !*ch) || (ch && !isprint(ch[j]))) {
 	    logg("!remote_cvdhead: Malformed CVD header (bad chars)\n");

 	    mirman_update(mdat->currip, mdat, 1);

 	    return NULL;
 	}
 	head[j] = ch[j];

     }
 

     if(!(cvd = cl_cvdparse(head))) {
 	logg("!Malformed CVD header (can't parse)\n");
 	mirman_update(mdat->currip, mdat, 1);
     } else {

 	logg("OK\n");

 	mirman_update(mdat->currip, mdat, 0);
     }

 
     return cvd;

 }
 

 static int getfile(const char *srcfile, const char *destfile, const char *hostname, char *ip, const char *localip, const char *proxy, int port, const char *user, const char *pass, const char *uas, int ctimeout, int rtimeout, struct mirdat *mdat)

 {

 	char cmd[512], buffer[FILEBUFF], *ch;

 	int bread, fd, totalsize = 0,  rot = 0, totaldownloaded = 0,
 	    percentage = 0, sd;
 	unsigned int i;
 	char *remotename = NULL, *authorization = NULL, *headerline, ipaddr[16];
 	const char *rotation = "|/-\\", *agent;

 
 
     if(proxy) {

         remotename = malloc(strlen(hostname) + 8);

 	if(!remotename) {
 	    logg("!getfile: Can't allocate memory for 'remotename'\n");
 	    return 75; /* FIXME */
 	}

         sprintf(remotename, "http://%s", hostname);
 

 	if(user) {
 	    authorization = proxyauth(user, pass);
 	    if(!authorization)
 		return 75; /* FIXME */
 	}

     }
 

     if(uas)
 	agent = uas;
     else

 #ifdef CL_EXPERIMENTAL
 	agent = PACKAGE"/"VERSION"-exp";
 #else

 	agent = PACKAGE"/"VERSION;

 #endif

     snprintf(cmd, sizeof(cmd),
 	"GET %s/%s HTTP/1.1\r\n"
 	"Host: %s\r\n%s"
 	"User-Agent: %s\r\n"

 #ifdef FRESHCLAM_NO_CACHE

 	"Cache-Control: no-cache\r\n"

 #endif

 	"Connection: close\r\n"
 	"\r\n", (remotename != NULL) ? remotename : "", srcfile, hostname, (authorization != NULL) ? authorization : "", agent);

     memset(ipaddr, 0, sizeof(ipaddr));
 
     if(ip[0]) /* use ip to connect */

 	sd = wwwconnect(ip, proxy, port, ipaddr, localip, ctimeout, mdat);

     else

 	sd = wwwconnect(hostname, proxy, port, ipaddr, localip, ctimeout, mdat);

     if(sd < 0) {
 	return 52;
     } else {
 	logg("*Trying to download http://%s/%s (IP: %s)\n", hostname, srcfile, ipaddr);
     }
 
     if(!ip[0])
 	strcpy(ip, ipaddr);
 

     if(send(sd, cmd, strlen(cmd), 0) < 0) {

 	logg("!getfile: Can't write to socket\n");
 	return 52;
     }

     if(remotename)
 	free(remotename);
 
     if(authorization)
 	free(authorization);
 
     /* read http headers */

     ch = buffer;
     i = 0;

     while(1) {
 	/* recv one byte at a time, until we reach \r\n\r\n */

 #ifdef SO_ERROR

 	if((i >= sizeof(buffer) - 1) || wait_recv(sd, buffer + i, 1, 0, rtimeout) == -1) {

 #else
 	if((i >= sizeof(buffer) - 1) || recv(sd, buffer + i, 1, 0) == -1) {
 #endif

 	    logg("!getfile: Error while reading database from %s (IP: %s)\n", hostname, ipaddr);
 	    mirman_update(mdat->currip, mdat, 1);

 	    return 52;
 	}

 	if(i > 2 && *ch == '\n' && *(ch - 1) == '\r' && *(ch - 2) == '\n' && *(ch - 3) == '\r') {
 	    i++;
 	    break;
 	}
 	ch++;

 	i++;

     }

     buffer[i] = 0;
 

     /* check whether the resource actually existed or not */

     if((strstr(buffer, "HTTP/1.1 404")) != NULL || (strstr(buffer, "HTTP/1.0 404")) != NULL) { 

 	logg("!getfile: %s not found on remote server (IP: %s)\n", srcfile, ipaddr);

 	/* mirman_update(mdat->currip, mdat, 1); */

 	closesocket(sd);

 	return 58;

     }
 

     if(!strstr(buffer, "HTTP/1.1 200") && !strstr(buffer, "HTTP/1.0 200") &&
        !strstr(buffer, "HTTP/1.1 206") && !strstr(buffer, "HTTP/1.0 206")) {

 	logg("!getfile: Unknown response from remote server (IP: %s)\n", ipaddr);
 	mirman_update(mdat->currip, mdat, 1);

 	closesocket(sd);

 	return 58;

     }
 

     /* get size of resource */
     for(i = 0; (headerline = cli_strtok(buffer, i, "\n")); i++){
         if(strstr(headerline, "Content-Length:")) { 

 	    if((ch = cli_strtok(headerline, 1, ": "))) {
 		totalsize = atoi(ch);
 		free(ch);
 	    } else {
 		totalsize = 0;
 	    }

         }

 	free(headerline);
     }
 
     if((fd = open(destfile, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644)) == -1) {
 	    char currdir[512];
 
 	getcwd(currdir, sizeof(currdir));
 	logg("!getfile: Can't create new file %s in %s\n", destfile, currdir);
 	logg("Hint: The database directory must be writable for UID %d or GID %d\n", getuid(), getgid());

 	closesocket(sd);

 	return 57;

     }
 

 #ifdef SO_ERROR

     while((bread = wait_recv(sd, buffer, FILEBUFF, 0, rtimeout)) > 0) {

 #else
     while((bread = recv(sd, buffer, FILEBUFF, 0)) > 0) {
 #endif

         if(write(fd, buffer, bread) != bread) {
 	    logg("getfile: Can't write %d bytes to %s\n", bread, destfile);
 	    unlink(destfile);
 	    close(fd);

 	    closesocket(sd);

 	    return 57; /* FIXME */
 	}

         if(totalsize > 0) {
 	    totaldownloaded += bread;
             percentage = (int) (100 * (float) totaldownloaded / totalsize);
 	}
 

         if(!mprintf_quiet) {
             if(totalsize > 0) {

                 mprintf("Downloading %s [%3i%%]\r", srcfile, percentage);

             } else {

                 mprintf("Downloading %s [%c]\r", srcfile, rotation[rot]);

                 rot++;
                 rot %= 4;
             }
             fflush(stdout);
         }

     }

     closesocket(sd);

     close(fd);

     if(totalsize > 0)

         logg("Downloading %s [%i%%]\n", srcfile, percentage);

     else

         logg("Downloading %s [*]\n", srcfile);
 

     mirman_update(mdat->currip, mdat, 0);

     return 0;
 }
 

 static int getcvd(const char *dbfile, const char *hostname, char *ip, const char *localip, const char *proxy, int port, const char *user, const char *pass, const char *uas, int nodb, unsigned int newver, int ctimeout, int rtimeout, struct mirdat *mdat)

 {
 	char *tempname;
 	struct cl_cvd *cvd;
 	int ret;
 
 
     tempname = cli_gentemp(".");
 
     logg("*Retrieving http://%s/%s\n", hostname, dbfile);

     if((ret = getfile(dbfile, tempname, hostname, ip, localip, proxy, port, user, pass, uas, ctimeout, rtimeout, mdat))) {
         logg("!Can't download %s from %s\n", dbfile, hostname);

         unlink(tempname);
         free(tempname);
         return ret;
     }
 
     if((ret = cl_cvdverify(tempname))) {
         logg("!Verification: %s\n", cl_strerror(ret));
         unlink(tempname);
         free(tempname);
         return 54;
     }
 
     if(!(cvd = cl_cvdhead(tempname))) {
 	logg("!Can't read CVD header of new %s database.\n", dbfile);
 	unlink(tempname);
 	free(tempname);
 	return 54;
     }
 
     if(cvd->version < newver) {

 	logg("^Mirror %s is not synchronized.\n", ip);

     	cl_cvdfree(cvd);
 	unlink(tempname);
 	free(tempname);
 	return 59;
     }
 
     if(!nodb && unlink(dbfile)) {
 	logg("!Can't unlink %s. Please fix it and try again.\n", dbfile);
     	cl_cvdfree(cvd);
 	unlink(tempname);
 	free(tempname);
 	return 53;
     } else {
     	if(rename(tempname, dbfile) == -1) {
     	    if(errno == EEXIST) {
     	        unlink(dbfile);
     	        if(rename(tempname, dbfile) == -1) {
                    logg("!All attempts to rename the temporary file failed: %s\n", strerror(errno));
 		   return 57;
 		}
             }
         }
     }

     return 0;
 }
 

 static int chdir_inc(const char *dbname)
 {
 	struct stat sb;
 	char path[32], dbfile[32];
 
 
     sprintf(path, "%s.inc", dbname);
     sprintf(dbfile, "%s.cvd", dbname);
 
     if(stat(path, &sb) == -1) {
 	if(mkdir(path, 0755) == -1) {
 	    logg("!chdir_inc: Can't create directory %s\n", path);
 	    return -1;
 	}
 
 	if(cvd_unpack(dbfile, path) == -1) {

 	    logg("!chdir_inc: Can't unpack %s into %s\n", dbfile, path);

 	    cli_rmdirs(path);

 	    return -1;

 	}
     }

 
     if(chdir(path) == -1) {
 	logg("!chdir_inc: Can't change directory to %s\n", path);
 	return -1;

     }

 
     return 0;
 }
 

 static int getpatch(const char *dbname, int version, const char *hostname, char *ip, const char *localip, const char *proxy, int port, const char *user, const char *pass, const char *uas, int ctimeout, int rtimeout, struct mirdat *mdat)

 {
 	char *tempname, patch[32], olddir[512];
 	int ret, fd;
 
 
     if(!getcwd(olddir, sizeof(olddir))) {
 	logg("!getpatch: Can't get path of current working directory\n");
 	return 50; /* FIXME */
     }
 
     if(chdir_inc(dbname) == -1)
 	return 50;
 
     tempname = cli_gentemp(".");
     snprintf(patch, sizeof(patch), "%s-%d.cdiff", dbname, version);
 
     logg("*Retrieving http://%s/%s\n", hostname, patch);

     if((ret = getfile(patch, tempname, hostname, ip, localip, proxy, port, user, pass, uas, ctimeout, rtimeout, mdat))) {
         logg("!getpatch: Can't download %s from %s\n", patch, hostname);

         unlink(tempname);
         free(tempname);
 	chdir(olddir);
         return ret;
     }
 

     if((fd = open(tempname, O_RDONLY|O_BINARY)) == -1) {

 	logg("!getpatch: Can't open %s for reading\n", tempname);
         unlink(tempname);
         free(tempname);
 	chdir(olddir);
 	return 55;
     }
 

     if(cdiff_apply(fd, 1) == -1) {

 	logg("!getpatch: Can't apply patch\n");

 	close(fd);

         unlink(tempname);
         free(tempname);
 	chdir(olddir);
 	return 70; /* FIXME */
     }
 

     close(fd);

     unlink(tempname);
     free(tempname);

     chdir(olddir);
     return 0;
 }
 

 static struct cl_cvd *currentdb(const char *dbname, unsigned int *inc)

 {
 	struct stat sb;
 	char path[512];
 	struct cl_cvd *cvd;
 
 
     snprintf(path, sizeof(path), "%s.inc", dbname);
     if(stat(path, &sb) != -1) {
 	snprintf(path, sizeof(path), "%s.inc/%s.info", dbname, dbname);

 	if(inc)
 	    *inc = 1;

     } else {

 	snprintf(path, sizeof(path), "%s.cvd", dbname);

 	if(inc)
 	    *inc = 0;

     }

 
     cvd = cl_cvdhead(path);
 
     return cvd;
 }
 

 static int updatedb(const char *dbname, const char *hostname, char *ip, int *signo, const struct cfgstruct *copt, const char *dnsreply, char *localip, int outdated, struct mirdat *mdat)

 {
 	struct cl_cvd *current, *remote;

 	const struct cfgstruct *cpt;

 	unsigned int nodb = 0, currver = 0, newver = 0, port = 0, i, j;
 	int ret, ims = -1;

 	char *pt, dbfile[32], dbinc[32], *bacinc = NULL;

 	const char *proxy = NULL, *user = NULL, *pass = NULL, *uas = NULL;

 	unsigned int flevel = cl_retflevel(), inc, maxattempts;

 	struct stat sb;

 	int ctimeout, rtimeout;

 
 
     snprintf(dbfile, sizeof(dbfile), "%s.cvd", dbname);
     snprintf(dbinc, sizeof(dbinc), "%s.inc", dbname);
 

     if(!(current = currentdb(dbname, &inc))) {

 	nodb = 1;

 	inc = 0;

 	if(stat(dbinc, &sb) != -1) {
 	    logg("^Removing corrupted incremental directory %s\n", dbinc);

 	    if(cli_rmdirs(dbinc)) {

 		logg("!Can't remove incremental directory\n");
 		return 53;
 	    }
 
 	    if(stat(dbfile, &sb) != -1) {
 		logg("^Removing obsolete %s\n", dbfile);
 		if(unlink(dbfile)) {
 		    logg("!Can't unlink %s\n", dbfile);
 		    return 53;
 		}
 	    }
 	}

     } else {
 	mdat->dbflevel = current->fl;

     }
 
     if(!nodb && dnsreply) {
 	    int field = 0;
 
 	if(!strcmp(dbname, "main")) {
 	    field = 1;
 	} else if(!strcmp(dbname, "daily")) {
 	    field = 2;
 	} else {
 	    logg("!updatedb: Unknown database name (%s) passed.\n", dbname);
 	    cl_cvdfree(current);
 	    return 70;
 	}
 
 	if(field && (pt = cli_strtok(dnsreply, field, ":"))) {
 	    if(!isnumb(pt)) {
 		logg("^Broken database version in TXT record.\n");
 	    } else {
 		newver = atoi(pt);
 		logg("*%s version from DNS: %d\n", dbfile, newver);
 	    }
 	    free(pt);
 	} else {
 	    logg("^Invalid DNS reply. Falling back to HTTP mode.\n");
 	}
     }
 
     /* Initialize proxy settings */
     if((cpt = cfgopt(copt, "HTTPProxyServer"))->enabled) {
 	proxy = cpt->strarg;
 	if(strncasecmp(proxy, "http://", 7) == 0)
 	    proxy += 7;
 
 	if((cpt = cfgopt(copt, "HTTPProxyUsername"))->enabled) {
 	    user = cpt->strarg;
 	    if((cpt = cfgopt(copt, "HTTPProxyPassword"))->enabled) {
 		pass = cpt->strarg;
 	    } else {
 		logg("HTTPProxyUsername requires HTTPProxyPassword\n");
 		if(current)
 		    cl_cvdfree(current);
 		return 56;
 	    }
 	}
 
 	if((cpt = cfgopt(copt, "HTTPProxyPort"))->enabled)
 	    port = cpt->numarg;
 
 	logg("Connecting via %s\n", proxy);
     }
 
     if((cpt = cfgopt(copt, "HTTPUserAgent"))->enabled)
 	uas = cpt->strarg;
 

     ctimeout = cfgopt(copt, "ConnectTimeout")->numarg;
     rtimeout = cfgopt(copt, "ReceiveTimeout")->numarg;

     if(!nodb && !newver) {

 	remote = remote_cvdhead(dbfile, hostname, ip, localip, proxy, port, user, pass, uas, &ims, ctimeout, rtimeout, mdat);

 
 	if(!nodb && !ims) {

 	    logg("%s is up to date (version: %d, sigs: %d, f-level: %d, builder: %s)\n", inc ? dbinc : dbfile, current->version, current->sigs, current->fl, current->builder);

 	    *signo += current->sigs;
 	    cl_cvdfree(current);
 	    return 1;
 	}
 
 	if(!remote) {
 	    logg("^Can't read %s header from %s (IP: %s)\n", dbfile, hostname, ip);
 	    cl_cvdfree(current);
 	    return 58;
 	}
 
 	newver = remote->version;
 	cl_cvdfree(remote);
     }
 
     if(!nodb && (current->version >= newver)) {

 	logg("%s is up to date (version: %d, sigs: %d, f-level: %d, builder: %s)\n", inc ? dbinc : dbfile, current->version, current->sigs, current->fl, current->builder);

 
 	if(!outdated && flevel < current->fl) {
 	    /* display warning even for already installed database */
 	    logg("^Current functionality level = %d, recommended = %d\n", flevel, current->fl);
 	    logg("Please check if ClamAV tools are linked against proper version of libclamav\n");

 	    logg("DON'T PANIC! Read http://www.clamav.net/support/faq\n");

 	}
 
 	*signo += current->sigs;
 	cl_cvdfree(current);
 	return 1;
     }
 
 

     if(current) {
 	currver = current->version;

 	cl_cvdfree(current);

     }

 
     /*
     if(ipaddr[0]) {
 	hostfd = wwwconnect(ipaddr, proxy, port, NULL, localip);
     } else {
 	hostfd = wwwconnect(hostname, proxy, port, ipaddr, localip);
 	if(!ip[0])
 	    strcpy(ip, ipaddr);
     }
 
     if(hostfd < 0) {
 	if(ipaddr[0])
 	    logg("Connection with %s (IP: %s) failed.\n", hostname, ipaddr);
 	else
 	    logg("Connection with %s failed.\n", hostname);
 	return 52;
     };
     */
 

     if(!cfgopt(copt, "ScriptedUpdates")->enabled)
 	nodb = 1;
 

     if(nodb) {

 	ret = getcvd(dbfile, hostname, ip, localip, proxy, port, user, pass, uas, nodb, newver, ctimeout, rtimeout, mdat);

 	if(ret) {
 	    memset(ip, 0, 16);

 	    return ret;

 	}

 
     } else {
 	ret = 0;
 

 	if(!access(dbinc, X_OK)) {
 	    if((bacinc = cli_gentemp("."))) {
 		if(dircopy(dbinc, bacinc) == -1) {
 		    free(bacinc);
 		    bacinc = NULL;
 		}
 	    }
 	}
 

 	maxattempts = cfgopt(copt, "MaxAttempts")->numarg;

 	for(i = currver + 1; i <= newver; i++) {

 	    for(j = 0; j < maxattempts; j++) {

 		ret = getpatch(dbname, i, hostname, ip, localip, proxy, port, user, pass, uas, ctimeout, rtimeout, mdat);
 		if(ret == 52 || ret == 58) {
 		    memset(ip, 0, 16);
 		    continue;
 		} else {
 		    break;
 		}

 	    }

 	    if(ret)
 		break;

 	}
 
 	if(ret) {

 	    logg("^Incremental update failed, trying to download %s\n", dbfile);

 	    ret = getcvd(dbfile, hostname, ip, localip, proxy, port, user, pass, uas, 1, newver, ctimeout, rtimeout, mdat);

 	    if(ret) {
 		if(bacinc) {
 		    logg("*Restoring incremental directory %s from backup\n", dbinc);

 		    cli_rmdirs(dbinc);

 		    rename(bacinc, dbinc);
 		    free(bacinc);
 		}

 		return ret;

 	    } else {
 		logg("*Removing incremental directory %s\n", dbinc);

 		cli_rmdirs(dbinc);

 	    }
 

 	} else {
 	    unlink(dbfile);

 	}

 
 	if(bacinc) {
 	    logg("*Removing backup directory %s\n", bacinc);

 	    cli_rmdirs(bacinc);

 	    free(bacinc);
 	}

     }
 

     if(!(current = currentdb(dbname, NULL))) {

 	/* should never be reached */
 	logg("!Can't parse new database\n");
 	return 55; /* FIXME */
     }
 

     if(nodb && inc)

 	cli_rmdirs(dbinc);

     logg("%s updated (version: %d, sigs: %d, f-level: %d, builder: %s)\n", inc ? dbinc : dbfile, current->version, current->sigs, current->fl, current->builder);

 
     if(flevel < current->fl) {
 	logg("^Your ClamAV installation is OUTDATED!\n");
 	logg("^Current functionality level = %d, recommended = %d\n", flevel, current->fl);

 	logg("DON'T PANIC! Read http://www.clamav.net/support/faq\n");

     }
 
     *signo += current->sigs;
     cl_cvdfree(current);
     return 0;

 }

 int downloadmanager(const struct cfgstruct *copt, const struct optstruct *opt, const char *hostname, const char *dbdir)

 {
 	time_t currtime;
 	int ret, updated = 0, outdated = 0, signo = 0;

 	unsigned int ttl, try = 0;

 	char ipaddr[16], *dnsreply = NULL, *pt, *localip = NULL, *newver = NULL;
 	const char *arg = NULL;

 	const struct cfgstruct *cpt;

 	struct mirdat mdat;

 #ifdef HAVE_RESOLV_H
 	const char *dnsdbinfo;
 #endif
 
     time(&currtime);
     logg("ClamAV update process started at %s", ctime(&currtime));
 
 #ifndef HAVE_GMP
     logg("SECURITY WARNING: NO SUPPORT FOR DIGITAL SIGNATURES\n");

     logg("See the FAQ at http://www.clamav.net/support/faq for an explanation.\n");

 #endif
 
 #ifdef HAVE_RESOLV_H
     dnsdbinfo = cfgopt(copt, "DNSDatabaseInfo")->strarg;
 
     if(opt_check(opt, "no-dns")) {
 	dnsreply = NULL;
     } else {
 	if((dnsreply = txtquery(dnsdbinfo, &ttl))) {
 	    logg("*TTL: %d\n", ttl);
 
 	    if((pt = cli_strtok(dnsreply, 3, ":"))) {
 		    int rt;
 		    time_t ct;
 
 		rt = atoi(pt);
 		free(pt);
 		time(&ct);
 		if((int) ct - rt > 10800) {
 		    logg("^DNS record is older than 3 hours.\n");
 		    free(dnsreply);
 		    dnsreply = NULL;
 		}
 
 	    } else {
 		free(dnsreply);
 		dnsreply = NULL;
 	    }
 
 	    if(dnsreply) {
 		    int vwarning = 1;
 
 		if((pt = cli_strtok(dnsreply, 4, ":"))) {
 		    if(*pt == '0')
 			vwarning = 0;
 
 		    free(pt);
 		}
 
 		if((newver = cli_strtok(dnsreply, 0, ":"))) {
 
 		    logg("*Software version from DNS: %s\n", newver);
 
 		    if(vwarning && !strstr(cl_retver(), "devel") && !strstr(cl_retver(), "rc")) {
 			if(strcmp(cl_retver(), newver)) {
 			    logg("^Your ClamAV installation is OUTDATED!\n");

 			    logg("^Local version: %s Recommended version: %s\n", cl_retver(), newver);

 			    logg("DON'T PANIC! Read http://www.clamav.net/support/faq\n");

 			    outdated = 1;
 			}
 		    }
 		}
 
 	    } else {
 		if(dnsreply) {
 		    free(dnsreply);
 		    dnsreply = NULL;
 		}
 	    }
 	}
 
 	if(!dnsreply) {
 	    logg("^Invalid DNS reply. Falling back to HTTP mode.\n");
 	}
     }
 #endif /* HAVE_RESOLV_H */
 
     if(opt_check(opt, "local-address")) {
         localip = opt_arg(opt, "local-address");
     } else if((cpt = cfgopt(copt, "LocalIPAddress"))->enabled) {
 	localip = cpt->strarg;
     }
 

     while(cli_writelockdb(dbdir, 0) == CL_ELOCKDB) {
 	logg("*Waiting to lock database directory: %s\n", dbdir);
 	sleep(5);
 	if(++try > 12) {
 	    logg("!Can't lock database directory: %s\n", dbdir);
 	    if(dnsreply)
 		free(dnsreply);
 	    if(newver)
 		free(newver);
 	    return 61; 
 	}
     }
 

     if(cfgopt(copt, "HTTPProxyServer")->enabled)
 	mirman_read("mirrors.dat", &mdat, 0);
     else
 	mirman_read("mirrors.dat", &mdat, 1);

     memset(ipaddr, 0, sizeof(ipaddr));
 

     if((ret = updatedb("main", hostname, ipaddr, &signo, copt, dnsreply, localip, outdated, &mdat)) > 50) {

 	if(dnsreply)
 	    free(dnsreply);
 
 	if(newver)
 	    free(newver);
 

 	mirman_write("mirrors.dat", &mdat);

 	cli_unlockdb(dbdir);

 	return ret;
 
     } else if(ret == 0)
 	updated = 1;
 
     /* if ipaddr[0] != 0 it will use it to connect to the web host */

     if((ret = updatedb("daily", hostname, ipaddr, &signo, copt, dnsreply, localip, outdated, &mdat)) > 50) {

 	if(dnsreply)
 	    free(dnsreply);
 
 	if(newver)
 	    free(newver);
 

 	mirman_write("mirrors.dat", &mdat);

 	cli_unlockdb(dbdir);

 	return ret;
 
     } else if(ret == 0)
 	updated = 1;
 
     if(dnsreply)
 	free(dnsreply);
 

     mirman_write("mirrors.dat", &mdat);

     cli_unlockdb(dbdir);

     if(updated) {
 	if(cfgopt(copt, "HTTPProxyServer")->enabled) {
 	    logg("Database updated (%d signatures) from %s\n", signo, hostname);
 	} else {
 	    logg("Database updated (%d signatures) from %s (IP: %s)\n", signo, hostname, ipaddr);
 	}
 
 #ifdef BUILD_CLAMD
 	if(opt_check(opt, "daemon-notify")) {
 		const char *clamav_conf = opt_arg(opt, "daemon-notify");
 	    if(!clamav_conf)
 		clamav_conf = CONFDIR"/clamd.conf";
 
 	    notify(clamav_conf);
 	} else if((cpt = cfgopt(copt, "NotifyClamd"))->enabled) {
 	    notify(cpt->strarg);
 	}
 #endif
 
 	if(opt_check(opt, "on-update-execute"))
 	    arg = opt_arg(opt, "on-update-execute");
 	else if((cpt = cfgopt(copt, "OnUpdateExecute"))->enabled)
 	    arg = cpt->strarg;
 
 	if(arg) {
 	    if(opt_check(opt, "daemon"))
 		execute("OnUpdateExecute", arg);
             else
 		system(arg);
 	}
     }
 
     if(outdated) {
 	if(opt_check(opt, "on-outdated-execute"))
 	    arg = opt_arg(opt, "on-outdated-execute");
 	else if((cpt = cfgopt(copt, "OnOutdatedExecute"))->enabled)
 	    arg = cpt->strarg;
 
 	if(arg) {
 		char *cmd = strdup(arg);
 

 	    if((pt = newver)) {
 		while(*pt) {
 		    if(!strchr("0123456789.", *pt)) {
 			logg("!downloadmanager: OnOutdatedExecute: Incorrect version number string\n");
 			free(newver);
 			newver = NULL;
 			break;
 		    }
 		    pt++;
 		}
 	    }
 
 	    if(newver && (pt = strstr(cmd, "%v"))) {

 		    char *buffer = (char *) malloc(strlen(cmd) + strlen(newver) + 10);

 
 		if(!buffer) {
 		    logg("!downloadmanager: Can't allocate memory for buffer\n");
 		    free(cmd);
 		    if(newver)
 			free(newver);

 		    return 75;

 		}
 
 		*pt = 0; pt += 2;
 		strcpy(buffer, cmd);
 		strcat(buffer, newver);
 		strcat(buffer, pt);
 		free(cmd);
 		cmd = strdup(buffer);
 		free(buffer);
 	    }
 

 	    if(newver) {
 		if(opt_check(opt, "daemon"))
 		    execute("OnOutdatedExecute", cmd);
 		else
 		    system(cmd);
 	    }

 	    free(cmd);
 	}
     }
 
     if(newver)
 	free(newver);
 
     return updated ? 0 : 1;
 }