/*
 *  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 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

#ifdef BUILD_CLAMD

#include <stdio.h>
#ifdef	HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#ifndef	_WIN32
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#include <string.h>
#include <errno.h>

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

#include "notify.h"

int clamd_connect(const char *cfgfile, const char *option)
{
#ifndef	_WIN32
	struct sockaddr_un server;
#endif
#ifdef HAVE_GETADDRINFO
	struct addrinfo hints, *res;
	char port[6];
	const char *addr;
	int ret;
#else
        struct sockaddr_in server2;
	struct hostent *he;
#endif
	struct optstruct *opts;
	const struct optstruct *opt;
	int sockd;
	const char *socktype;


    if((opts = optparse(cfgfile, 0, NULL, 1, OPT_CLAMD, 0, NULL)) == NULL) {
	logg("!%s: Can't find or parse configuration file %s\n", option, cfgfile);
	return -11;
    }

#ifndef	_WIN32
    if((opt = optget(opts, "LocalSocket"))->enabled) {
	socktype = "UNIX";
	server.sun_family = AF_UNIX;
	strncpy(server.sun_path, opt->strarg, sizeof(server.sun_path));
	server.sun_path[sizeof(server.sun_path)-1]='\0';

	if((sockd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	    logg("^Clamd was NOT notified: Can't create socket endpoint for %s\n", opt->strarg);
	    perror("socket()");
	    optfree(opts);
	    return -1;
	}

	if(connect(sockd, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
	    closesocket(sockd);
	    logg("^Clamd was NOT notified: Can't connect to clamd through %s\n", opt->strarg);
	    perror("connect()");
	    optfree(opts);
	    return -11;
	}

    } else
#endif
    if((opt = optget(opts, "TCPSocket"))->enabled) {
	socktype = "TCP";

#ifdef HAVE_GETADDRINFO
	memset(&hints, 0, sizeof(hints));
/*
#ifdef SUPPORT_IPv6
	hints.ai_family = AF_UNSPEC;
#else
*/
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	snprintf(port, sizeof(port), "%u", (unsigned int) opt->numarg);
	port[5] = 0;

	if((opt = optget(opts, "TCPAddr"))->enabled)
	    addr = opt->strarg;
	else
	    addr = NULL;

	ret = getaddrinfo(addr, port, &hints, &res);

	if(ret) {
	    logg("!%s: Can't resolve hostname %s (%s)\n", option, addr ? addr : "", (ret == EAI_SYSTEM) ? strerror(errno) : gai_strerror(ret));
	    optfree(opts);
	    return -1;
	}

	if((sockd = socket(res->ai_family, SOCK_STREAM, 0)) < 0) {
	    perror("socket()");
	    logg("!%s: Can't create TCP socket\n", option);
	    optfree(opts);
	    freeaddrinfo(res);
	    return -1;
	}

	if(connect(sockd, res->ai_addr, res->ai_addrlen) == -1) {
	    perror("connect()");
	    closesocket(sockd);
	    logg("!%s: Can't connect to clamd on %s:%s\n", option, addr ? addr : "localhost", port);
	    optfree(opts);
	    freeaddrinfo(res);
	    return -1;
	}
	freeaddrinfo(res);

#else /* IPv4 */

	if((sockd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
	    logg("!%s: Can't create TCP socket\n", option);
	    perror("socket()");
	    optfree(opts);
	    return -1;
	}

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

	if((opt = optget(opts, "TCPAddr"))->enabled) {
	    if((he = gethostbyname(opt->strarg)) == 0) {
		perror("gethostbyname()");
		logg("^Clamd was NOT notified: Can't resolve hostname '%s'\n", opt->strarg);
		optfree(opts);
		closesocket(sockd);
		return -1;
	    }
	    server2.sin_addr = *(struct in_addr *) he->h_addr_list[0];
	} else
	    server2.sin_addr.s_addr = inet_addr("127.0.0.1");


	if(connect(sockd, (struct sockaddr *) &server2, sizeof(struct sockaddr_in)) < 0) {
	    closesocket(sockd);
	    logg("^Clamd was NOT notified: Can't connect to clamd on %s:%d\n",
		    inet_ntoa(server2.sin_addr), ntohs(server2.sin_port));
	    perror("connect()");
	    optfree(opts);
	    return -1;
	}

#endif

    } else {
	logg("!%s: No communication socket specified in %s\n", option, cfgfile);
	optfree(opts);
	return 1;
    }

    optfree(opts);
    return sockd;
}

int notify(const char *cfgfile)
{
	char buff[20];
	int sockd, bread;

    if((sockd = clamd_connect(cfgfile, "NotifyClamd")) < 0)
	return 1;

    if(sendln(sockd, "RELOAD", 7) < 0) {
	logg("!NotifyClamd: Could not write to clamd socket\n");
	perror("send()");
	closesocket(sockd);
	return 1;
    }

    memset(buff, 0, sizeof(buff));
    if((bread = recv(sockd, buff, sizeof(buff), 0)) > 0) {
	if(!strstr(buff, "RELOADING")) {
	    logg("!NotifyClamd: Unknown answer from clamd: '%s'\n", buff);
	    closesocket(sockd);
	    return 1;
	}
    }

    closesocket(sockd);
    logg("Clamd successfully notified about the update.\n");
    return 0;
}
#endif