/*
 *  Copyright (C) 2002 - 2007 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 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 <unistd.h>
#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/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <utime.h>
#include <errno.h>

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

#include "others.h"
#include "defaults.h"
#include "options.h"
#include "cfgparser.h"
#include "output.h"
#include "misc.h"
#include "str.h"
#include "client.h"

#ifdef PF_INET
# define SOCKET_INET	PF_INET
#else
# define SOCKET_INET	AF_INET
#endif

void move_infected(const char *filename, const struct optstruct *opt);
int notremoved = 0, notmoved = 0;

static int dsresult(int sockd, const struct optstruct *opt)
{
	int infected = 0, waserror = 0;
	char buff[4096], *pt;
	FILE *fd;


#ifndef C_OS2
    if((fd = fdopen(dup(sockd), "r")) == NULL) {
#else /* FIXME: accoriding to YD OS/2 does not support dup() for sockets */
    if((fd = fdopen(sockd, "r")) == NULL) {
#endif
	logg("^Can't open descriptor for reading.\n");
	return -1;
    }

    while(fgets(buff, sizeof(buff), fd)) {
	if(strstr(buff, "FOUND\n")) {
	    infected++;
	    logg("%s", buff);
	    if(opt_check(opt, "move") || opt_check(opt, "copy")) {
		/* filename: Virus FOUND */
		if((pt = strrchr(buff, ':'))) {
		    *pt = 0;
		    move_infected(buff, opt);
		} else {
		    logg("!Incorrect output from clamd. File not %s.\n", opt_check(opt, "move") ? "moved" : "copied");
		}

	    } else if(opt_check(opt, "remove")) {
		if(!(pt = strrchr(buff, ':'))) {
		    logg("!Incorrect output from clamd. File not removed.\n");
		} else {
		    *pt = 0;
		    if(unlink(buff)) {
			logg("!%s: Can't remove.\n", buff);
			notremoved++;
		    } else {
			logg("~%s: Removed.\n", buff);
		    }
		}
	    }
	}

	if(strstr(buff, "ERROR\n")) {
	    logg("~%s", buff);
	    waserror = 1;
	}
    }

#ifndef C_OS2 /* Small memory leak under OS/2 (see above) */
    fclose(fd);
#endif

    return infected ? infected : (waserror ? -1 : 0);
}

static int dsfile(int sockd, const char *scantype, const char *filename, const struct optstruct *opt)
{
	int ret;
	char *scancmd;


    scancmd = malloc(strlen(filename) + 20);
    sprintf(scancmd, "%s %s", scantype, filename);

    if(write(sockd, scancmd, strlen(scancmd)) <= 0) {
	logg("^Can't write to the socket.\n");
	free(scancmd);
	return -1;
    }

    free(scancmd);

    ret = dsresult(sockd, opt);

    if(!ret)
	logg("~%s: OK\n", filename);

    return ret;
}

static int dsstream(int sockd, const struct optstruct *opt)
{
	int wsockd, loopw = 60, bread, port, infected = 0;
	struct sockaddr_in server;
	struct sockaddr_in peer;
	socklen_t peer_size;
	char buff[4096], *pt;


    if(write(sockd, "STREAM", 6) <= 0) {
	logg("^Can't write to the socket.\n");
	return 2;
    }

    while(loopw) {
	memset(buff, 0, sizeof(buff));
	if(read(sockd, buff, sizeof(buff)) > 0) {
	    if((pt = strstr(buff, "PORT"))) {
		pt += 5;
		sscanf(pt, "%d", &port);
		break;
	    }
	}
	loopw--;
    }

    if(!loopw) {
	logg("^Daemon not ready for stream scanning.\n");
	return -1;
    }

    /* connect to clamd */

    if((wsockd = socket(SOCKET_INET, SOCK_STREAM, 0)) < 0) {
	perror("socket()");
	logg("^Can't create the socket.\n");
	return -1;
    }

    server.sin_family = AF_INET;
    server.sin_port = htons(port);

    peer_size = sizeof(peer);
    if(getpeername(sockd, (struct sockaddr *) &peer, &peer_size) < 0) {
	perror("getpeername()");
	logg("^Can't get socket peer name.\n");
	return -1;
    }

    switch (peer.sin_family) {
	case AF_UNIX:
	    server.sin_addr.s_addr = inet_addr("127.0.0.1");
	    break;
	case AF_INET:
	    server.sin_addr.s_addr = peer.sin_addr.s_addr;
	    break;
	default:
	    logg("^Unexpected socket type: %d.\n", peer.sin_family);
	    return -1;
    }

    if(connect(wsockd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)) < 0) {
	close(wsockd);
	perror("connect()");
	logg("^Can't connect to clamd [port: %d].\n", port);
	return -1;
    }

    while((bread = read(0, buff, sizeof(buff))) > 0) {
	if(write(wsockd, buff, bread) <= 0) {
	    logg("^Can't write to the socket.\n");
	    close(wsockd);
	    return -1;
	}
    }
    close(wsockd);

    memset(buff, 0, sizeof(buff));
    while((bread = read(sockd, buff, sizeof(buff))) > 0) {
	logg("%s", buff);
	if(strstr(buff, "FOUND\n")) {
	    infected++;

	} else if(strstr(buff, "ERROR\n")) {
	    logg("%s", buff);
	    return -1;
	}
	memset(buff, 0, sizeof(buff));
    }

    return infected;
}

#ifndef PATH_MAX
#define PATH_MAX 1024
#endif

static char *abpath(const char *filename)
{
	struct stat foo;
	char *fullpath, cwd[PATH_MAX + 1];

    if(stat(filename, &foo) == -1) {
	logg("^Can't access file %s\n", filename);
	perror(filename);
	return NULL;
    } else {
	fullpath = malloc(PATH_MAX + strlen(filename) + 10);
#ifdef C_CYGWIN
	sprintf(fullpath, "%s", filename);
#else
	if(!getcwd(cwd, PATH_MAX)) {
	    logg("^Can't get absolute pathname of current working directory.\n");
	    return NULL;
	}
	sprintf(fullpath, "%s/%s", cwd, filename);
#endif
    }

    return fullpath;
}

static int dconnect(const struct optstruct *opt, int *is_unix)
{
	struct sockaddr_un server;
	struct sockaddr_in server2;
	struct hostent *he;
	struct cfgstruct *copt;
	const struct cfgstruct *cpt;
	const char *clamav_conf = opt_arg(opt, "config-file");
	int sockd;

    if(is_unix)
	    *is_unix = 0;
    if(!clamav_conf)
	clamav_conf = DEFAULT_CFG;

    if((copt = getcfg(clamav_conf, 1)) == NULL) {
	logg("^Can't parse the configuration file.\n");
	return -1;
    }

    memset((char *) &server, 0, sizeof(server));
    memset((char *) &server2, 0, sizeof(server2));

    /* Set default address to connect to */
    server2.sin_addr.s_addr = inet_addr("127.0.0.1");    

    if((cpt = cfgopt(copt, "LocalSocket"))->enabled) {

	server.sun_family = AF_UNIX;
	strncpy(server.sun_path, cpt->strarg, sizeof(server.sun_path));
	server.sun_path[sizeof(server.sun_path)-1]='\0';

	if((sockd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	    perror("socket()");
	    logg("^Can't create the socket.\n");
	    freecfg(copt);
	    return -1;
	}

	if(connect(sockd, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
	    close(sockd);
	    perror("connect()");
	    logg("^Can't connect to clamd.\n");
	    freecfg(copt);
	    return -1;
	}
	if(is_unix)
		*is_unix = 1;
    } else if((cpt = cfgopt(copt, "TCPSocket"))->enabled) {

	if((sockd = socket(SOCKET_INET, SOCK_STREAM, 0)) < 0) {
	    perror("socket()");
	    logg("^Can't create the socket.\n");
	    freecfg(copt);
	    return -1;
	}

	server2.sin_family = AF_INET;
	server2.sin_port = htons(cpt->numarg);

	if((cpt = cfgopt(copt, "TCPAddr"))->enabled) {
	    if ((he = gethostbyname(cpt->strarg)) == 0) {
		close(sockd);
		perror("gethostbyname()");
		logg("^Can't lookup clamd hostname.\n");
		freecfg(copt);
		return -1;
	    }
	    server2.sin_addr = *(struct in_addr *) he->h_addr_list[0];
	}

	if(connect(sockd, (struct sockaddr *) &server2, sizeof(struct sockaddr_in)) < 0) {
	    close(sockd);
	    perror("connect()");
	    logg("^Can't connect to clamd.\n");
	    freecfg(copt);
	    return -1;
	}

    } else {
	logg("^Clamd is not configured properly.\n");
	freecfg(copt);
	return -1;
    }

    freecfg(copt);

    return sockd;
}

int get_clamd_version(const struct optstruct *opt)
{
	char buff[64];
	int bread, sockd;


    if((sockd = dconnect(opt, NULL)) < 0)
	return 2;

    if(write(sockd, "VERSION", 7) <= 0) {
	logg("^Can't write to the socket.\n");
	return 2;
    }

    while((bread = read(sockd, buff, sizeof(buff)-1)) > 0) {
	buff[bread] = '\0';
	printf("%s\n", buff);
    }

    close(sockd);
    return 0;
}

int client(const struct optstruct *opt, int *infected)
{
	char cwd[PATH_MAX+1], *fullpath;
	int sockd, ret, errors = 0;
	struct stat sb;
	const char *scantype = "CONTSCAN";


    *infected = 0;

    if(opt_check(opt, "multiscan"))
	scantype = "MULTISCAN";

    /* parse argument list */
    if(opt->filename == NULL || strlen(opt->filename) == 0) {
	/* scan current directory */
	if(!getcwd(cwd, PATH_MAX)) {
	    logg("^Can't get absolute pathname of current working directory.\n");
	    return 2;
	}

	if((sockd = dconnect(opt, NULL)) < 0)
	    return 2;

	if((ret = dsfile(sockd, scantype, cwd, opt)) >= 0)
	    *infected += ret;
	else
	    errors++;

	close(sockd);

    } else if(!strcmp(opt->filename, "-")) { /* scan data from stdin */
        int is_unix;
	if((sockd = dconnect(opt, &is_unix)) < 0)
	    return 2;

	if(opt_check(opt,"fdpass")) {
#ifndef HAVE_FD_PASSING
		logg("^File descriptor pass support not compiled in, falling back to stream scan\n");
		ret = dsstream(sockd, opt);
#else
		if(!is_unix) {
			logg("^File descriptor passing can only work on local (unix) sockets! Falling back to stream scan\n");
			/* fall back to stream */
			ret = dsstream(sockd, opt);
		} else {
			char buff[4096];
			memset(buff, 0, sizeof(buff));
			ret = clamd_fdscan(sockd, 0, buff, sizeof(buff));
			logg("fd: %s%s",buff, ret == 1 ? " FOUND" : ret == -1 ? " ERROR" : "OK");
		}
#endif
	} else
		ret = dsstream(sockd, opt);
	if(ret >= 0)
	    *infected += ret;
	else
	    errors++;

	close(sockd);

    } else {
	int x;
	char *thefilename;
	for (x = 0; (thefilename = cli_strtok(opt->filename, x, "\t")) != NULL; x++) {
	    fullpath = thefilename;

	    if(stat(fullpath, &sb) == -1) {
		logg("^Can't access file %s\n", fullpath);
		perror(fullpath);
		errors++;
	    } else {
		if(strcmp(fullpath, "/") && (strlen(fullpath) < 2 || (fullpath[0] != '/' && fullpath[0] != '\\' && fullpath[1] != ':'))) {
		    fullpath = abpath(thefilename);
		    free(thefilename);

		    if(!fullpath) {
			logg("^Can't determine absolute path.\n");
			return 2;
		    }
		}

		switch(sb.st_mode & S_IFMT) {
		    case S_IFREG:
		    case S_IFDIR:
			if((sockd = dconnect(opt, NULL)) < 0)
			    return 2;

			if((ret = dsfile(sockd, scantype, fullpath, opt)) >= 0)
			    *infected += ret;
			else
			    errors++;

			close(sockd);
			break;

		    default:
			logg("^Not supported file type (%s)\n", fullpath);
			errors++;
		}
	    }

	    free(fullpath);
	}
    }

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

void move_infected(const char *filename, const struct optstruct *opt)
{
	char *movedir, *movefilename, numext[4 + 1];
	const char *tmp;
	struct stat ofstat, mfstat;
	int n, len, movefilename_size;
	int moveflag = opt_check(opt, "move");
	struct utimbuf ubuf;


    if((moveflag && !(movedir = opt_arg(opt, "move"))) ||
        (!moveflag && !(movedir = opt_arg(opt, "copy")))) {
        /* Should never reach here */
        logg("^opt_arg() returned NULL\n");
        notmoved++;
        return;
    }

    if(access(movedir, W_OK|X_OK) == -1) {
        logg("^error %s file '%s': cannot write to '%s': %s\n", (moveflag) ? "moving" : "copying", filename, movedir, strerror(errno));
        notmoved++;
        return;
    }

    if(stat(filename, &ofstat) == -1) {
        logg("^Can't stat file %s\n", filename);
	logg("Try to run clamdscan with clamd privileges\n");
        notmoved++;
	return;
    }

    if(!(tmp = strrchr(filename, '/')))
	tmp = filename;

    movefilename_size = sizeof(char) * (strlen(movedir) + strlen(tmp) + sizeof(numext) + 2);

    if(!(movefilename = malloc(movefilename_size))) {
        logg("^Memory allocation error\n");
	exit(2);
    }

    if(!(cli_strrcpy(movefilename, movedir))) {
        logg("^cli_strrcpy() returned NULL\n");
        notmoved++;
        free(movefilename);
        return;
    }

    strcat(movefilename, "/");

    if(!(strcat(movefilename, tmp))) {
        logg("^strcat() returned NULL\n");
        notmoved++;
        free(movefilename);
        return;
    }

    if(!stat(movefilename, &mfstat)) {
        if((ofstat.st_dev == mfstat.st_dev) && (ofstat.st_ino == mfstat.st_ino)) { /* It's the same file*/
            logg("File excluded '%s'\n", filename);
            notmoved++;
            free(movefilename);
            return;
        } else {
            /* file exists - try to append an ordinal number to the
	     * quranatined file in an attempt not to overwrite existing
	     * files in quarantine  
	     */
            len = strlen(movefilename);
            n = 0;        		        		
            do {
                /* reset the movefilename to it's initial value by
		 * truncating to the original filename length
		 */
                movefilename[len] = 0;
                /* append .XXX */
                sprintf(numext, ".%03d", n++);
                strcat(movefilename, numext);            	
            } while(!stat(movefilename, &mfstat) && (n < 1000));
       }
    }

    if(!moveflag || rename(filename, movefilename) == -1) {
	if(filecopy(filename, movefilename) == -1) {
	    logg("^cannot %s '%s' to '%s': %s\n", (moveflag) ? "move" : "copy", filename, movefilename, strerror(errno));
	    notmoved++;
	    free(movefilename);
	    return;
	}

	chmod(movefilename, ofstat.st_mode);
	if(chown(movefilename, ofstat.st_uid, ofstat.st_gid) == -1)
	    logg("^chown() failed for %s: %s\n", movefilename, strerror(errno));

	ubuf.actime = ofstat.st_atime;
	ubuf.modtime = ofstat.st_mtime;
	utime(movefilename, &ubuf);

	if(moveflag && unlink(filename)) {
	    logg("^cannot unlink '%s': %s\n", filename, strerror(errno));
	    notremoved++;            
	    free(movefilename);
	    return;
	}
    }

    logg("%s: %s to '%s'\n", (moveflag)?"moved":"copied", filename, movefilename);

    free(movefilename);
}