#include "connwrap.h"

#include <stdio.h>

#include <stdlib.h>

#include <netdb.h>

#include <string.h>

#include <netinet/in.h>

#include <errno.h>

#include <arpa/inet.h>

#include <fcntl.h>

#include <sys/time.h>

#include <unistd.h>

#define PROXY_TIMEOUT   10

    // HTTP proxy timeout in seconds (for the CONNECT method)

#ifdef HAVE_OPENSSL

#define OPENSSL_NO_KRB5 1

#include <openssl/ssl.h>

#include <openssl/err.h>

#else

# ifdef HAVE_GNUTLS

# include <gnutls/openssl.h>

# define HAVE_OPENSSL

# endif

#endif

static int in_http_connect = 0;

#ifdef HAVE_OPENSSL

static SSL_CTX *ctx = 0;

typedef struct { int fd; SSL *ssl; } sslsock;

static sslsock *socks = 0;

static int sockcount = 0;

static sslsock *getsock(int fd) {

    int i;

    for(i = 0; i < sockcount; i++)

	if(socks[i].fd == fd)

	    return &socks[i];

    return 0;

}

static sslsock *addsock(int fd) {

    sslsock *p;

    socks = (sslsock *) realloc(socks, sizeof(sslsock)*++sockcount);

    p = &socks[sockcount-1];

    if(!ctx) {

	SSL_library_init();

	SSL_load_error_strings();

#ifdef HAVE_SSLEAY

	SSLeay_add_all_algorithms();

#else

	OpenSSL_add_all_algorithms();

#endif

	//ctx = SSL_CTX_new(SSLv23_method());

	ctx = SSL_CTX_new(SSLv23_client_method());

    }

    p->ssl = SSL_new(ctx);

    SSL_set_fd(p->ssl, p->fd = fd);

    return p;

}

static void delsock(int fd) {

    int i, nsockcount;

    sslsock *nsocks;

    nsockcount = 0;

    nsocks = (sslsock *) malloc(sizeof(sslsock)*(sockcount-1));

    for(i = 0; i < sockcount; i++) {

	if(socks[i].fd != fd) {

	    nsocks[nsockcount++] = socks[i];

	} else {

	    SSL_free(socks[i].ssl);

	}

    }

    free(socks);

    socks = nsocks;

    sockcount = nsockcount;

}

#endif

static char *bindaddr = 0, *proxyhost = 0, *proxyuser = 0, *proxypass = 0;

static int proxyport = 3128;

static int proxy_ssl = 0;

#define SOCKOUT(s) write(sockfd, s, strlen(s))

int cw_http_connect(int sockfd, const struct sockaddr *serv_addr, int addrlen) {

    int err, pos, fl;

    struct hostent *server;

    struct sockaddr_in paddr;

    char buf[512];

    fd_set rfds;

    err = 0;

    in_http_connect = 1;

    if(!(server = gethostbyname(proxyhost))) {

	errno = h_errno;

	err = -1;

    }

    if(!err) {

	memset(&paddr, 0, sizeof(paddr));

	paddr.sin_family = AF_INET;

	memcpy(&paddr.sin_addr.s_addr, *server->h_addr_list, server->h_length);

	paddr.sin_port = htons(proxyport);

	fl = fcntl(sockfd, F_GETFL);

	fcntl(sockfd, F_SETFL, fl & ~O_NONBLOCK);

	buf[0] = 0;

	err = cw_connect(sockfd, (struct sockaddr *) &paddr, sizeof(paddr), proxy_ssl);

    }

    errno = ECONNREFUSED;

    if(!err) {

	struct sockaddr_in *sin = (struct sockaddr_in *) serv_addr;

	char *ip = inet_ntoa(sin->sin_addr), c;

	struct timeval tv;

	sprintf(buf, "%d", ntohs(sin->sin_port));

	SOCKOUT("CONNECT ");

	SOCKOUT(ip);

	SOCKOUT(":");

	SOCKOUT(buf);

	SOCKOUT(" HTTP/1.0\r\n");

	if(proxyuser) {

	    char *b;

	    SOCKOUT("Proxy-Authorization: Basic ");

	    sprintf(buf, "%s:%s", proxyuser, proxypass);

	    b = cw_base64_encode(buf);

	    SOCKOUT(b);

	    free(b);

	    SOCKOUT("\r\n");

	}

	SOCKOUT("\r\n");

	buf[0] = 0;

	while(err != -1) {

	    FD_ZERO(&rfds);

	    FD_SET(sockfd, &rfds);

	    tv.tv_sec = PROXY_TIMEOUT;

	    tv.tv_usec = 0;

	    err = select(sockfd+1, &rfds, 0, 0, &tv);

	    if(err < 1) err = -1;

	    if(err != -1 && FD_ISSET(sockfd, &rfds)) {

		err = read(sockfd, &c, 1);

		if(!err) err = -1;

		if(err != -1) {

		    pos = strlen(buf);

		    buf[pos] = c;

		    buf[pos+1] = 0;

		    if(strlen(buf) > 4)

		    if(!strcmp(buf+strlen(buf)-4, "\r\n\r\n"))

			break;

		}

	    }

	}

    }

    if(err != -1 && strlen(buf)) {

	char *p = strstr(buf, " ");

	err = -1;

	if(p)

	if(atoi(++p) == 200)

	    err = 0;

	fcntl(sockfd, F_SETFL, fl);

	if(fl & O_NONBLOCK) {

	    errno = EINPROGRESS;

	    err = -1;

	}

    }

    in_http_connect = 0;

    return err;

}

int cw_connect(int sockfd, const struct sockaddr *serv_addr, int addrlen, int ssl) {

    int rc;

    struct sockaddr_in ba;

    if(bindaddr)

    if(strlen(bindaddr)) {

#ifdef HAVE_INET_ATON

	struct in_addr addr;

	rc = inet_aton(bindaddr, &addr);

	ba.sin_addr.s_addr = addr.s_addr;

#else

	rc = inet_pton(AF_INET, bindaddr, &ba);

#endif

	if(rc) {

	    ba.sin_port = 0;

	    rc = bind(sockfd, (struct sockaddr *) &ba, sizeof(ba));

	} else {

	    rc = -1;

	}

	if(rc) return rc;

    }

    if(proxyhost && !in_http_connect) rc = cw_http_connect(sockfd, serv_addr, addrlen);

	else rc = connect(sockfd, serv_addr, addrlen);

#ifdef HAVE_OPENSSL

    if(ssl && !rc) {

	sslsock *p = addsock(sockfd);

	if(SSL_connect(p->ssl) != 1)

	    return -1;

    }

#endif

    return rc;

}

int cw_nb_connect(int sockfd, const struct sockaddr *serv_addr, int addrlen, int ssl, int *state) {

    int rc = 0;

    struct sockaddr_in ba;

    if(bindaddr)

    if(strlen(bindaddr)) {

#ifdef HAVE_INET_ATON

	struct in_addr addr;

	rc = inet_aton(bindaddr, &addr);

	ba.sin_addr.s_addr = addr.s_addr;

#else

	rc = inet_pton(AF_INET, bindaddr, &ba);

#endif

	if(rc) {

	    ba.sin_port = 0;

	    rc = bind(sockfd, (struct sockaddr *) &ba, sizeof(ba));

	} else {

	    rc = -1;

	}

	if(rc) return rc;

    }

#ifdef HAVE_OPENSSL

    if(ssl) {

	if ( !(*state & CW_CONNECT_WANT_SOMETHING))

	    rc = cw_connect(sockfd, serv_addr, addrlen, 0);

	else{ /* check if the socket is connected correctly */

	    int optlen = sizeof(int), optval;

	    if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, (socklen_t*)&optlen) || optval)

	    return -1;

	}

	if(!rc) {

	    sslsock *p;

	    if (*state & CW_CONNECT_SSL)

		p = getsock(sockfd);

	    else

		p = addsock(sockfd);

	    rc = SSL_connect(p->ssl);

	    switch(rc){

	    case 1:

		*state = 0;

		return 0;

	    case 0:

		return -1;

	    default:

		switch (SSL_get_error(p->ssl, rc)){

		case SSL_ERROR_WANT_READ:

		    *state = CW_CONNECT_SSL | CW_CONNECT_WANT_READ;

		    return 0;

		case SSL_ERROR_WANT_WRITE:

		    *state = CW_CONNECT_SSL | CW_CONNECT_WANT_WRITE;

		    return 0;

		default:

		    return -1;

		}

	    }

	}

	else{ /* catch EINPROGRESS error from the connect call */

	    if (errno == EINPROGRESS){

		*state = CW_CONNECT_STARTED | CW_CONNECT_WANT_WRITE;

		return 0;

	    }

	}

	return rc;

    }

#endif

    if ( !(*state & CW_CONNECT_WANT_SOMETHING))

	rc = connect(sockfd, serv_addr, addrlen);

    else{ /* check if the socket is connected correctly */

	int optlen = sizeof(int), optval;

	if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, (socklen_t*)&optlen) || optval)

	    return -1;

	*state = 0;

	return 0;

    }

    if (rc)

	if (errno == EINPROGRESS){

	    *state = CW_CONNECT_STARTED | CW_CONNECT_WANT_WRITE;

	    return 0;

	}

    return rc;

}

int cw_accept(int s, struct sockaddr *addr, int *addrlen, int ssl) {

#ifdef HAVE_OPENSSL

    int rc;

    if(ssl) {

	rc = accept(s, addr, (socklen_t*)addrlen);

	if(!rc) {

	    sslsock *p = addsock(s);

	    if(SSL_accept(p->ssl) != 1)

		return -1;

	}

	return rc;

    }

#endif

    return accept(s, addr, (socklen_t*)addrlen);

}

int cw_write(int fd, const void *buf, int count, int ssl) {

#ifdef HAVE_OPENSSL

    sslsock *p;

    if(ssl)

    if((p = getsock(fd)) != NULL)

	return SSL_write(p->ssl, buf, count);

#endif

    return write(fd, buf, count);

}

int cw_read(int fd, void *buf, int count, int ssl) {

#ifdef HAVE_OPENSSL

    sslsock *p;

    if(ssl)

    if((p = getsock(fd)) != NULL)

	return SSL_read(p->ssl, buf, count);

#endif

    return read(fd, buf, count);

}

void cw_close(int fd) {

#ifdef HAVE_OPENSSL

    delsock(fd);

#endif

    close(fd);

}

#define FREEVAR(v) if(v) free(v), v = 0;

void cw_setbind(const char *abindaddr) {

    FREEVAR(bindaddr);

    bindaddr = strdup(abindaddr);

}

void cw_setproxy(const char *aproxyhost, int aproxyport, const char *aproxyuser, const char *aproxypass) {

    FREEVAR(proxyhost);

    FREEVAR(proxyuser);

    FREEVAR(proxypass);

    if(aproxyhost && strlen(aproxyhost)) proxyhost = strdup(aproxyhost);

    if(aproxyuser && strlen(aproxyuser)) proxyuser = strdup(aproxyuser);

    if(aproxypass && strlen(aproxypass)) proxypass = strdup(aproxypass);

    proxyport = aproxyport;

}