/*

  *  Copyright (C) 2009 Sourcefire, Inc.
  *
  *  Authors: Tomasz Kojm, aCaB

  *
  *  This program is free software; you can redistribute it and/or modify

  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.

  *
  *  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.

  */
 

 #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 <sys/types.h>

 #include <sys/stat.h>

 #include <sys/socket.h>

 #ifdef HAVE_SYS_LIMITS_H
 #include <sys/limits.h>
 #endif

 #include <sys/select.h>

 #include <sys/un.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

 #include <netdb.h>

 #include <utime.h>
 #include <errno.h>

 #include <dirent.h>

 #include <fcntl.h>

 #ifdef HAVE_SYS_UIO_H
 #include <sys/uio.h>
 #endif
 

 #include "shared/optparser.h"
 #include "shared/output.h"
 #include "shared/misc.h"

 #include "shared/actions.h"

 #include "libclamav/str.h"

 #include "libclamav/others.h"

 #include "client.h"

 #include "proto.h"

 #ifndef INADDR_LOOPBACK
 #define INADDR_LOOPBACK 0x7f000001

 #endif

 struct sockaddr *mainsa = NULL;
 int mainsasz;

 unsigned long int maxstream;

 static struct sockaddr_un nixsock;
 static struct sockaddr_in tcpsock;

 /* Inits the communication layer
  * Returns 0 if clamd is local, non zero if clamd is remote */

 static int isremote(const struct optstruct *opts) {
     int s, ret;
     const struct optstruct *opt;
     struct optstruct *clamdopts;
     const char *clamd_conf = optget(opts, "config-file")->strarg;

     static struct sockaddr_in testsock;

     if((clamdopts = optparse(clamd_conf, 0, NULL, 1, OPT_CLAMD, 0, NULL)) == NULL) {
 	logg("!Can't parse clamd configuration file %s\n", clamd_conf);
 	return 0;

     }

     if((opt = optget(clamdopts, "LocalSocket"))->enabled) {

 	memset((void *)&nixsock, 0, sizeof(nixsock));
 	nixsock.sun_family = AF_UNIX;
 	strncpy(nixsock.sun_path, opt->strarg, sizeof(nixsock.sun_path));
 	nixsock.sun_path[sizeof(nixsock.sun_path)-1]='\0';
 	mainsa = (struct sockaddr *)&nixsock;
 	mainsasz = sizeof(nixsock);
 	optfree(clamdopts);
 	return 0;

     }

     if(!(opt = optget(clamdopts, "TCPSocket"))->enabled) {
 	optfree(clamdopts);
 	return 0;

     }

     mainsa = (struct sockaddr *)&tcpsock;
     mainsasz = sizeof(tcpsock);

 
     if (cfg_tcpsock(clamdopts, &tcpsock, INADDR_LOOPBACK) == -1) {
 	logg("!Can't lookup clamd hostname: %s.\n", strerror(errno));

 	optfree(clamdopts);
 	mainsa = NULL;
 	return 0;

     }

     optfree(clamdopts);

     memcpy((void *)&testsock, (void *)&tcpsock, sizeof(testsock));
     testsock.sin_port = htons(INADDR_ANY);
     if(!(s = socket(testsock.sin_family, SOCK_STREAM, 0))) return 0;
     ret = (bind(s, (struct sockaddr *)&testsock, sizeof(testsock)) != 0);

     close(s);
     return ret;

 }
 

 /* Turns a relative path into an absolute one
  * Returns a pointer to the path (which must be 
  * freed by the caller) or NULL on error */

 static char *makeabs(const char *basepath) {

     int namelen;

     char *ret;

     if(!(ret = malloc(PATH_MAX + 1))) {
 	logg("^Can't make room for fullpath.\n");

 	return NULL;

     }
     if(*basepath != '/') { /* FIXME: to be unified */
 	if(!getcwd(ret, PATH_MAX)) {

 	    logg("^Can't get absolute pathname of current working directory.\n");

 	    free(ret);

 	    return NULL;
 	}

 	namelen = strlen(ret);
 	snprintf(&ret[namelen], PATH_MAX - namelen, "/%s", basepath);

     } else {

 	strncpy(ret, basepath, PATH_MAX);

     }

     ret[PATH_MAX] = '\0';
     return ret;
 }

 /* Recursively scans a path with the given scantype
  * Returns non zero for serious errors, zero otherwise */

 static int client_scan(const char *file, int scantype, int *infected, int maxlevel, int session, int flags) {

     int ret;
     char *fullpath = makeabs(file);
 

     if(!fullpath)
 	return 0;

     if (!session)

 	ret = serial_client_scan(fullpath, scantype, infected, maxlevel, flags);

     else

 	ret = parallel_client_scan(fullpath, scantype, infected, maxlevel, flags);

     free(fullpath);

     return ret;

 }

 int get_clamd_version(const struct optstruct *opts)

 {

 	char *buff;
 	int len, sockd;
 	struct RCVLN rcv;

     isremote(opts);
     if(!mainsa) return 2;
     if((sockd = dconnect()) < 0) return 2;

     recvlninit(&rcv, sockd);

     if(sendln(sockd, "zVERSION", 9)) {

 	close(sockd);

 	return 2;
     }
 

     while((len = recvln(&rcv, &buff, NULL))) {
 	if(len == -1) {
 	    logg("!Error occoured while receiving version information.\n");
 	    break;
 	}

 	printf("%s\n", buff);
     }
 
     close(sockd);
     return 0;
 }
 

 int reload_clamd_database(const struct optstruct *opts)

 {

 	char *buff;
 	int len, sockd;
 	struct RCVLN rcv;

     isremote(opts);
     if(!mainsa) return 2;
     if((sockd = dconnect()) < 0) return 2;

     recvlninit(&rcv, sockd);

     if(sendln(sockd, "zRELOAD", 8)) {

 	close(sockd);
 	return 2;
     }
 

     if(!(len = recvln(&rcv, &buff, NULL)) || len < 10 || memcmp(buff, "RELOADING", 9)) {

 	logg("!Clamd did not reload the database\n");

 	close(sockd);
 	return 2;
     }
     close(sockd);
     return 0;
 }
 

 int client(const struct optstruct *opts, int *infected)

 {

 	const char *clamd_conf = optget(opts, "config-file")->strarg;
 	struct optstruct *clamdopts;

 	int remote, scantype, session = 0, errors = 0, scandash = 0, maxrec, flags = 0;

 	const char *fname;

     if((clamdopts = optparse(clamd_conf, 0, NULL, 1, OPT_CLAMD, 0, NULL)) == NULL) {
 	logg("!Can't parse clamd configuration file %s\n", clamd_conf);
 	return 2;
     }

     scandash = (opts->filename && opts->filename[0] && !strcmp(opts->filename[0], "-") && !optget(opts, "file-list")->enabled && !opts->filename[1]);

     remote = isremote(opts) | optget(opts, "stream")->enabled;

 #ifdef HAVE_FD_PASSING

     if(!remote && optget(clamdopts, "LocalSocket")->enabled && (optget(opts, "fdpass")->enabled || scandash)) {

 	scantype = FILDES;
 	session = optget(opts, "multiscan")->enabled;

     } else 

 #endif

     if(remote || scandash) {
 	scantype = STREAM;
 	session = optget(opts, "multiscan")->enabled;

     } else if(optget(opts, "multiscan")->enabled) scantype = MULTI;
     else scantype = CONT;

     maxrec = optget(clamdopts, "MaxDirectoryRecursion")->numarg;

     maxstream = optget(clamdopts, "StreamMaxLength")->numarg;

     if (optget(clamdopts, "FollowDirectorySymlinks")->enabled)
 	flags |= CLI_FTW_FOLLOW_DIR_SYMLINK;
     if (optget(clamdopts, "FollowFileSymlinks")->enabled)
 	flags |= CLI_FTW_FOLLOW_FILE_SYMLINK;

     flags |= CLI_FTW_TRIM_SLASHES;

     optfree(clamdopts);

     if(!mainsa) {
 	logg("!Clamd is not configured properly.\n");
 	return 2;
     }

     *infected = 0;

     if(scandash) {

 	int sockd, ret;

 	struct stat sb;
 	fstat(0, &sb);
 	if((sb.st_mode & S_IFMT) != S_IFREG) scantype = STREAM;

 	if((sockd = dconnect()) >= 0 && (ret = dsresult(sockd, scantype, NULL, &ret)) >= 0)

 	    *infected = ret;

 	else

 	    errors = 1;

 	if(sockd >= 0) close(sockd);

     } else if(opts->filename || optget(opts, "file-list")->enabled) {
 	if(opts->filename && optget(opts, "file-list")->enabled)
 	    logg("^Only scanning files from --file-list (files passed at cmdline are ignored)\n");
 
 	while(!errors && (fname = filelist(opts, NULL))) {
 	    if(!strcmp(fname, "-")) {

 		logg("!Scanning from standard input requires \"-\" to be the only file argument\n");

 		continue;

 	    }

 	    errors = client_scan(fname, scantype, infected, maxrec, session, flags);

 	}

     } else {

 	errors = client_scan("", scantype, infected, maxrec, session, flags);

     }

     return *infected ? 1 : (errors ? 2 : 0);

 }