The R13B03 release.OTP_R13B03

1 files changed, 1738 insertions, 0 deletions

diff --git a/lib/erl_interface/src/connect/ei_connect.c b/lib/erl_interface/src/connect/ei_connect.c
new file mode 100644
index 0000000000..9ac5a93c5a
--- /dev/null
+++ b/lib/erl_interface/src/connect/ei_connect.c
@@ -0,0 +1,1738 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2000-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+/*
+ * Purpose: Connect to any node at any host. (EI version)
+ */
+
+#include "eidef.h"
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#ifdef __WIN32__
+#include <winsock2.h>
+#include <windows.h>
+#include <winbase.h>
+
+#elif VXWORKS
+#include <vxWorks.h>
+#include <hostLib.h>
+#include <selectLib.h>
+#include <ifLib.h>
+#include <sockLib.h>
+#include <taskLib.h>
+#include <inetLib.h>
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/times.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h> 
+#include <timers.h> 
+
+#define getpid() taskIdSelf()
+
+#else /* some other unix */
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/times.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h> 
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/utsname.h>  /* for gen_challenge (NEED FIX?) */
+#include <time.h>
+#endif
+
+/* common includes */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "eiext.h"
+#include "ei_portio.h"
+#include "ei_internal.h"
+#include "ei_connect_int.h"
+#include "ei_locking.h"
+#include "eisend.h"
+#include "eirecv.h"
+#include "eimd5.h"
+#include "putget.h"
+#include "ei_resolve.h"
+#include "ei_epmd.h"
+#include "ei_internal.h"
+
+int ei_tracelevel = 0;
+
+#define COOKIE_FILE "/.erlang.cookie"
+#define EI_MAX_HOME_PATH 1024
+
+/* FIXME why not macro? */
+static char *null_cookie = "";
+
+static int get_cookie(char *buf, int len);
+static int get_home(char *buf, int size);
+
+/* forwards */
+static unsigned gen_challenge(void);
+static void gen_digest(unsigned challenge, char cookie[], 
+		       unsigned char digest[16]);
+static int send_status(int fd, char *status, unsigned ms);
+static int recv_status(int fd, unsigned ms);
+static int send_challenge(int fd, char *nodename, 
+			  unsigned challenge, unsigned version, unsigned ms);
+static int recv_challenge(int fd, unsigned *challenge, 
+			  unsigned *version,
+			  unsigned *flags, ErlConnect *namebuf, unsigned ms);
+static int send_challenge_reply(int fd, unsigned char digest[16], 
+				unsigned challenge, unsigned ms);
+static int recv_challenge_reply(int fd, 
+				unsigned our_challenge,
+				char cookie[], 
+				unsigned *her_challenge, unsigned ms);
+static int send_challenge_ack(int fd, unsigned char digest[16], unsigned ms);
+static int recv_challenge_ack(int fd, 
+			      unsigned our_challenge,
+			      char cookie[], unsigned ms);
+static int send_name(int fd, char *nodename, 
+		     unsigned version, unsigned ms); 
+
+/* Common for both handshake types */
+static int recv_name(int fd, 
+		     unsigned *version,
+		     unsigned *flags, ErlConnect *namebuf, unsigned ms);
+
+
+/***************************************************************************
+ *
+ *  For each file descriptor returned from ei_connect() we save information
+ *  about distribution protocol version, node information for this node
+ *  and the cookie.
+ *
+ ***************************************************************************/
+
+typedef struct ei_socket_info_s {
+    int socket;
+    int dist_version;
+    ei_cnode cnode;	/* A copy, not a pointer. We don't know when freed */
+    char cookie[EI_MAX_COOKIE_SIZE+1];
+} ei_socket_info;
+
+int ei_n_sockets = 0, ei_sz_sockets = 0;
+ei_socket_info *ei_sockets = NULL;
+#ifdef _REENTRANT
+ei_mutex_t* ei_sockets_lock = NULL;
+#endif /* _REENTRANT */
+
+
+/***************************************************************************
+ *
+ *  XXX
+ *
+ ***************************************************************************/
+
+static int put_ei_socket_info(int fd, int dist_version, char* cookie, ei_cnode *ec)
+{
+    int i;
+
+#ifdef _REENTRANT
+    ei_mutex_lock(ei_sockets_lock, 0);
+#endif /* _REENTRANT */
+    for (i = 0; i < ei_n_sockets; ++i) {
+	if (ei_sockets[i].socket == fd) {
+	    if (dist_version == -1) {
+		memmove(&ei_sockets[i], &ei_sockets[i+1],
+			sizeof(ei_sockets[0])*(ei_n_sockets-i-1));
+	    } else {
+		ei_sockets[i].dist_version = dist_version;
+		/* Copy the content, see ei_socket_info */
+		ei_sockets[i].cnode = *ec;
+		strcpy(ei_sockets[i].cookie, cookie);
+	    }
+#ifdef _REENTRANT
+	    ei_mutex_unlock(ei_sockets_lock);
+#endif /* _REENTRANT */
+	    return 0;
+	}
+    }
+    if (ei_n_sockets == ei_sz_sockets) {
+	ei_sz_sockets += 5;
+	ei_sockets = realloc(ei_sockets,
+			     sizeof(ei_sockets[0])*ei_sz_sockets);
+	if (ei_sockets == NULL) {
+	    ei_sz_sockets = ei_n_sockets = 0;
+#ifdef _REENTRANT
+	    ei_mutex_unlock(ei_sockets_lock);
+#endif /* _REENTRANT */
+	    return -1;
+	}
+	ei_sockets[ei_n_sockets].socket = fd;
+	ei_sockets[ei_n_sockets].dist_version = dist_version;
+	ei_sockets[i].cnode = *ec;
+	strcpy(ei_sockets[ei_n_sockets].cookie, cookie);
+	++ei_n_sockets;
+    }
+#ifdef _REENTRANT
+    ei_mutex_unlock(ei_sockets_lock);
+#endif /* _REENTRANT */
+    return 0;
+}
+
+#if 0
+/* FIXME not used ?! */
+static int remove_ei_socket_info(int fd, int dist_version, char* cookie)
+{
+    return put_ei_socket_info(fd, -1, NULL);
+}
+#endif
+
+static ei_socket_info* get_ei_socket_info(int fd)
+{
+    int i;
+#ifdef _REENTRANT
+    ei_mutex_lock(ei_sockets_lock, 0);
+#endif /* _REENTRANT */
+    for (i = 0; i < ei_n_sockets; ++i)
+	if (ei_sockets[i].socket == fd) {
+	    /*fprintf("get_ei_socket_info %d  %d \"%s\"\n",
+		    fd, ei_sockets[i].dist_version, ei_sockets[i].cookie);*/
+#ifdef _REENTRANT
+	    ei_mutex_unlock(ei_sockets_lock);
+#endif /* _REENTRANT */
+	    return &ei_sockets[i];
+	}
+#ifdef _REENTRANT
+    ei_mutex_unlock(ei_sockets_lock);
+#endif /* _REENTRANT */
+    return NULL;
+}
+
+ei_cnode *ei_fd_to_cnode(int fd)
+{
+    ei_socket_info *sockinfo = get_ei_socket_info(fd);
+    if (sockinfo == NULL) return NULL;
+    return &sockinfo->cnode;
+}
+
+/***************************************************************************
+ *  XXXX
+ ***************************************************************************/
+
+int ei_distversion(int fd)
+{
+    ei_socket_info* e = get_ei_socket_info(fd);
+    if (e == NULL)
+	return -1;
+    else
+	return e->dist_version;
+}
+
+static const char* ei_cookie(int fd)
+{
+    ei_socket_info* e = get_ei_socket_info(fd);
+    if (e == NULL)
+	return NULL;
+    else
+	return e->cookie;
+}
+
+const char *ei_thisnodename(const ei_cnode* ec)
+{
+    return ec->thisnodename;
+}
+
+const char *ei_thishostname(const ei_cnode* ec)
+{
+    return ec->thishostname;
+}
+
+const char *ei_thisalivename(const ei_cnode* ec)
+{
+    return ec->thisalivename;
+}
+
+short ei_thiscreation(const ei_cnode* ec)
+{
+    return ec->creation;
+}
+
+/* FIXME: this function is not an api, why not? */
+const char *ei_thiscookie(const ei_cnode* ec)
+{
+    return (const char *)ec->ei_connect_cookie;
+}
+
+erlang_pid *ei_self(ei_cnode* ec)
+{
+    return &ec->self;
+}
+
+/* two internal functions that will let us support different cookies
+* (to be able to connect to other nodes that don't have the same
+* cookie as each other or us)
+*/
+const char *ei_getfdcookie(int fd)
+{
+    const char* r = ei_cookie(fd);
+    if (r == NULL) r = "";
+    return r;
+}
+
+/* call with cookie to set value to use on descriptor fd,
+* or specify NULL to use default
+*/
+/* FIXME why defined but not used? */
+#if 0
+static int ei_setfdcookie(ei_cnode* ec, int fd, char *cookie)
+{
+    int dist_version = ei_distversion(fd);
+
+    if (cookie == NULL)
+	cookie = ec->ei_connect_cookie;
+    return put_ei_socket_info(fd, dist_version, cookie);
+}
+#endif
+
+static int get_int32(unsigned char *s)
+{
+    return ((s[0] << 24) | (s[1] << 16) | (s[2] << 8) | (s[3] ));
+}
+
+
+#ifdef __WIN32__
+void win32_error(char *buf, int buflen)
+{
+    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+	0,	/* n/a */
+	WSAGetLastError(), /* error code */
+	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* language */
+	buf,
+	buflen,
+	NULL);
+    return;
+}
+
+static int initWinSock(void)
+{
+    WORD wVersionRequested;  
+    WSADATA wsaData; 
+    int i; 
+    /* FIXME problem for threaded ? */ 
+    static int initialized = 0;
+    
+    wVersionRequested = MAKEWORD(1, 1); 
+    if (!initialized) {
+	initialized = 1;
+	/* FIXME not terminate, just a message?! */
+	if ((i = WSAStartup(wVersionRequested, &wsaData))) {
+	    EI_TRACE_ERR1("ei_connect_init",
+			  "ERROR: can't initialize windows sockets: %d",i);
+	    return 0;
+	}
+	
+	if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { 
+	    EI_TRACE_ERR0("initWinSock","ERROR: this version of windows "
+			  "sockets not supported");
+	    WSACleanup(); 
+	    return 0;
+	}
+    }
+    return 1;
+}
+#endif
+
+/*
+* Perhaps run this routine instead of ei_connect_init/2 ?
+* Initailize by setting:
+* thishostname, thisalivename, thisnodename and thisipaddr
+*/
+int ei_connect_xinit(ei_cnode* ec, const char *thishostname,
+		     const char *thisalivename, const char *thisnodename,
+		     Erl_IpAddr thisipaddr, const char *cookie,
+		     const short creation)
+{
+    char *dbglevel;
+    
+/* FIXME this code was enabled for 'erl'_connect_xinit(), why not here? */
+#if 0    
+#ifdef __WIN32__
+    if (!initWinSock()) {
+	EI_TRACE_ERR0("ei_connect_xinit","can't initiate winsock");
+	return ERL_ERROR;
+    }
+#endif
+#endif
+
+#ifdef _REENTRANT
+    if (ei_sockets_lock == NULL) {
+	ei_sockets_lock = ei_mutex_create();
+    }
+#endif /* _REENTRANT */
+
+    ec->creation = creation;
+    
+    if (cookie) {
+	if (strlen(cookie) >= sizeof(ec->ei_connect_cookie)) { 
+	    EI_TRACE_ERR0("ei_connect_xinit",
+			  "ERROR: Cookie size too large");
+	    return ERL_ERROR;
+	} else {
+	    strcpy(ec->ei_connect_cookie, cookie);
+	}
+    } else if (!get_cookie(ec->ei_connect_cookie, sizeof(ec->ei_connect_cookie))) {
+	return ERL_ERROR;
+    }
+    
+    if (strlen(thishostname) >= sizeof(ec->thishostname)) {
+	EI_TRACE_ERR0("ei_connect_xinit","ERROR: Thishostname too long");
+	return ERL_ERROR;
+    }
+    strcpy(ec->thishostname, thishostname);
+    
+    if (strlen(thisalivename) >= sizeof(ec->thisalivename)) {
+	EI_TRACE_ERR0("ei_connect_init","Thisalivename too long");
+	return ERL_ERROR;
+    }
+	
+    strcpy(ec->thisalivename, thisalivename);
+    
+    if (strlen(thisnodename) >= sizeof(ec->thisnodename)) {
+	EI_TRACE_ERR0("ei_connect_init","Thisnodename too long");
+	return ERL_ERROR;
+    }
+    strcpy(ec->thisnodename, thisnodename);
+
+/* FIXME right now this_ipaddr is never used */    
+/*    memmove(&ec->this_ipaddr, thisipaddr, sizeof(ec->this_ipaddr)); */
+    
+    strcpy(ec->self.node,thisnodename);
+    ec->self.num = 0;
+    ec->self.serial = 0;
+    ec->self.creation = creation;
+
+    if ((dbglevel = getenv("EI_TRACELEVEL")) != NULL ||
+	(dbglevel = getenv("ERL_DEBUG_DIST")) != NULL)
+	ei_tracelevel = atoi(dbglevel);
+
+    return 0;
+}
+
+
+/*
+* Initialize by set: thishostname, thisalivename, 
+* thisnodename and thisipaddr. At success return 0,
+* otherwise return -1.
+*/
+int ei_connect_init(ei_cnode* ec, const char* this_node_name,
+		    const char *cookie, short creation)
+{
+    struct hostent *hp;
+    char thishostname[EI_MAXHOSTNAMELEN+1];
+    char thisnodename[MAXNODELEN+1];
+    char thisalivename[EI_MAXALIVELEN+1];
+
+#ifdef __WIN32__
+    if (!initWinSock()) {
+	EI_TRACE_ERR0("ei_connect_xinit","can't initiate winsock");
+	return ERL_ERROR;
+    }
+#endif /* win32 */
+#ifdef _REENTRANT
+    if (ei_sockets_lock == NULL) {
+	ei_sockets_lock = ei_mutex_create();
+    }
+#endif /* _REENTRANT */
+    
+    if (gethostname(thishostname, EI_MAXHOSTNAMELEN) == -1) {
+#ifdef __WIN32__
+	EI_TRACE_ERR1("ei_connect_init","Failed to get host name: %d",
+		      WSAGetLastError());
+#else
+	EI_TRACE_ERR1("ei_connect_init","Failed to get host name: %d", errno);
+#endif /* win32 */
+	return ERL_ERROR;
+    }
+
+    if (this_node_name == NULL)
+	sprintf(thisalivename, "c%d", (int) getpid());
+    else
+	strcpy(thisalivename, this_node_name);
+    
+    if ((hp = ei_gethostbyname(thishostname)) == 0) {
+	/* Looking up IP given hostname fails. We must be on a standalone
+	   host so let's use loopback for communication instead. */
+	if ((hp = ei_gethostbyname("localhost")) == 0) {
+#ifdef __WIN32__
+	    char reason[1024];
+	
+	    win32_error(reason,sizeof(reason));
+	    EI_TRACE_ERR2("ei_connect_init",
+			  "Can't get ip address for host %s: %s",
+			  thishostname, reason);
+#else
+	    EI_TRACE_ERR2("ei_connect_init",
+			  "Can't get ip address for host %s: %d",
+			  thishostname, h_errno);
+#endif /* win32 */
+	    return ERL_ERROR;
+	}
+    }
+    {
+	char* ct;
+	if (strcmp(hp->h_name, "localhost") == 0) {
+	    /* We use a short node name */    
+	    if ((ct = strchr(thishostname, '.')) != NULL) *ct = '\0';
+	    sprintf(thisnodename, "%s@%s", this_node_name, thishostname);
+	} else {
+	    /* We use a short node name */    
+	    if ((ct = strchr(hp->h_name, '.')) != NULL) *ct = '\0';
+	    strcpy(thishostname, hp->h_name);
+	    sprintf(thisnodename, "%s@%s", this_node_name, hp->h_name);
+	}
+    }
+    return ei_connect_xinit(ec, thishostname, thisalivename, thisnodename,
+			    (struct in_addr *)*hp->h_addr_list, cookie, creation);
+}
+
+
+/* connects to port at ip-address ip_addr 
+* and returns fd to socket 
+* port has to be in host byte order 
+*/
+static int cnct(uint16 port, struct in_addr *ip_addr, int addr_len, unsigned ms)
+{
+    int s, res;
+    struct sockaddr_in iserv_addr;
+    
+    if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+	erl_errno = errno;
+	return ERL_ERROR;
+    }
+    
+    memset((char*)&iserv_addr, 0, sizeof(struct sockaddr_in));
+    memcpy((char*)&iserv_addr.sin_addr, (char*)ip_addr, addr_len);
+    iserv_addr.sin_family = AF_INET;
+    iserv_addr.sin_port = htons(port);
+    
+    if ((res = ei_connect_t(s, (struct sockaddr*)&iserv_addr, 
+		      sizeof(iserv_addr),ms)) < 0) {
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	closesocket(s);
+	return ERL_ERROR;
+    }
+    
+    return s;
+} /* cnct */
+
+  /* 
+  * Set up a connection to a given Node, and 
+  * interchange hand shake messages with it.
+  * Returns a valid file descriptor at success,
+  * otherwise a negative error code.
+*/
+int ei_connect_tmo(ei_cnode* ec, char *nodename, unsigned ms)
+{
+    char *hostname, alivename[BUFSIZ];
+    struct hostent *hp;
+#if !defined (__WIN32__) 
+    /* these are needed for the call to gethostbyname_r */
+    struct hostent host;
+    char buffer[1024];
+    int ei_h_errno;
+#endif /* !win32 */
+    
+    /* extract the host and alive parts from nodename */
+    if (!(hostname = strchr(nodename,'@'))) {
+	EI_TRACE_ERR0("ei_connect","Node name has no @ in name");
+	return ERL_ERROR;
+    } else {
+	strncpy(alivename, nodename, hostname - nodename);
+	alivename[hostname - nodename] = 0x0;
+	hostname++;
+    }
+    
+#ifndef __WIN32__
+    hp = ei_gethostbyname_r(hostname,&host,buffer,1024,&ei_h_errno);
+    if (hp == NULL) {
+	char thishostname[EI_MAXHOSTNAMELEN+1];
+	if (gethostname(thishostname,EI_MAXHOSTNAMELEN) < 0) {
+	    EI_TRACE_ERR0("ei_connect_tmo",
+			  "Failed to get name of this host");
+	    erl_errno = EHOSTUNREACH;
+	    return ERL_ERROR;
+	} else {
+	    char *ct;
+	    /* We use a short node name */    
+	    if ((ct = strchr(thishostname, '.')) != NULL) *ct = '\0';
+	}
+	if (strcmp(hostname,thishostname) == 0)
+	    /* Both nodes on same standalone host, use loopback */
+	    hp = ei_gethostbyname_r("localhost",&host,buffer,1024,&ei_h_errno);
+	if (hp == NULL) {
+	    EI_TRACE_ERR2("ei_connect",
+			  "Can't find host for %s: %d\n",nodename,ei_h_errno);
+	    erl_errno = EHOSTUNREACH;
+	    return ERL_ERROR;
+	}
+    }
+#else /* __WIN32__ */
+    if ((hp = ei_gethostbyname(hostname)) == NULL) {
+	char thishostname[EI_MAXHOSTNAMELEN+1];
+	if (gethostname(thishostname,EI_MAXHOSTNAMELEN) < 0) {
+	    EI_TRACE_ERR1("ei_connect_tmo",
+			  "Failed to get name of this host: %d", 
+			  WSAGetLastError());
+	    erl_errno = EHOSTUNREACH;
+	    return ERL_ERROR;
+	} else {
+	    char *ct;
+	    /* We use a short node name */    
+	    if ((ct = strchr(thishostname, '.')) != NULL) *ct = '\0';
+	}
+	if (strcmp(hostname,thishostname) == 0)
+	    /* Both nodes on same standalone host, use loopback */
+	    hp = ei_gethostbyname("localhost");
+	if (hp == NULL) {
+	    char reason[1024];
+	    win32_error(reason,sizeof(reason));
+	    EI_TRACE_ERR2("ei_connect",
+			  "Can't find host for %s: %s",nodename,reason);
+	    erl_errno = EHOSTUNREACH;
+	    return ERL_ERROR;
+	}
+    }
+#endif /* win32 */
+    return ei_xconnect_tmo(ec, (Erl_IpAddr) *hp->h_addr_list, alivename, ms);
+} /* ei_connect */
+
+int ei_connect(ei_cnode* ec, char *nodename)
+{
+    return ei_connect_tmo(ec, nodename, 0);
+}
+
+
+ /* ip_addr is now in network byte order 
+  *
+  * first we have to get hold of the portnumber to
+  *  the node through epmd at that host 
+  *
+*/
+int ei_xconnect_tmo(ei_cnode* ec, Erl_IpAddr adr, char *alivename, unsigned ms)
+{
+    struct in_addr *ip_addr=(struct in_addr *) adr;
+    int rport = 0; /*uint16 rport = 0;*/
+    int sockd;
+    int one = 1;
+    int dist = 0;
+    ErlConnect her_name;
+    unsigned her_flags, her_version;
+
+    erl_errno = EIO;		/* Default error code */
+    
+    EI_TRACE_CONN1("ei_xconnect","-> CONNECT attempt to connect to %s",
+		   alivename);
+    
+    if ((rport = ei_epmd_port_tmo(ip_addr,alivename,&dist, ms)) < 0) {
+	EI_TRACE_ERR0("ei_xconnect","-> CONNECT can't get remote port");
+	/* ei_epmd_port_tmo() has set erl_errno */
+	return ERL_NO_PORT;
+    }
+    
+    /* we now have port number to enode, try to connect */
+    if((sockd = cnct((uint16)rport, ip_addr, sizeof(struct in_addr),ms)) < 0) {
+	EI_TRACE_ERR0("ei_xconnect","-> CONNECT socket connect failed");
+	/* cnct() has set erl_errno */
+	return ERL_CONNECT_FAIL;
+    }
+    
+    EI_TRACE_CONN0("ei_xconnect","-> CONNECT connected to remote");
+
+    /* FIXME why connect before checking 'dist' output from ei_epmd_port() ?! */
+    if (dist <= 4) {
+	EI_TRACE_ERR0("ei_xconnect","-> CONNECT remote version not compatible");
+	goto error;
+    }
+    else {
+	unsigned our_challenge, her_challenge;
+	unsigned char our_digest[16];
+	
+	if (send_name(sockd, ec->thisnodename, (unsigned) dist, ms))
+	    goto error;
+	if (recv_status(sockd, ms))
+	    goto error;
+	if (recv_challenge(sockd, &her_challenge, &her_version,
+	    &her_flags, &her_name, ms))
+	    goto error;
+	our_challenge = gen_challenge();
+	gen_digest(her_challenge, ec->ei_connect_cookie, our_digest);
+	if (send_challenge_reply(sockd, our_digest, our_challenge, ms))
+	    goto error;
+	if (recv_challenge_ack(sockd, our_challenge, 
+	    ec->ei_connect_cookie, ms))
+	    goto error;
+	put_ei_socket_info(sockd, dist, null_cookie, ec); /* FIXME check == 0 */
+    }
+    
+    setsockopt(sockd, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof(one));
+    setsockopt(sockd, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof(one));
+
+    EI_TRACE_CONN1("ei_xconnect","-> CONNECT (ok) remote = %s",alivename);
+    
+    erl_errno = 0;
+    return sockd;
+    
+error:
+    EI_TRACE_ERR0("ei_xconnect","-> CONNECT failed");
+    closesocket(sockd);
+    return ERL_ERROR;
+} /* ei_xconnect */
+
+int ei_xconnect(ei_cnode* ec, Erl_IpAddr adr, char *alivename)
+{
+    return ei_xconnect_tmo(ec, adr, alivename, 0);
+}
+
+
+  /* 
+  * For symmetry reasons
+*/
+#if 0
+int ei_close_connection(int fd)
+{
+    return closesocket(fd);
+} /* ei_close_connection */
+#endif
+
+  /*
+  * Accept and initiate a connection from an other
+  * Erlang node. Return a file descriptor at success,
+  * otherwise -1;
+*/
+int ei_accept(ei_cnode* ec, int lfd, ErlConnect *conp)
+{
+    return ei_accept_tmo(ec, lfd, conp, 0);
+}
+
+int ei_accept_tmo(ei_cnode* ec, int lfd, ErlConnect *conp, unsigned ms)
+{
+    int fd;
+    struct sockaddr_in cli_addr;
+    int cli_addr_len=sizeof(struct sockaddr_in);
+    unsigned her_version, her_flags;
+    ErlConnect her_name;
+
+    erl_errno = EIO;		/* Default error code */
+
+    EI_TRACE_CONN0("ei_accept","<- ACCEPT waiting for connection");
+    
+    if ((fd = ei_accept_t(lfd, (struct sockaddr*) &cli_addr, 
+	&cli_addr_len, ms )) < 0) {
+	EI_TRACE_ERR0("ei_accept","<- ACCEPT socket accept failed");
+	erl_errno = (fd == -2) ? ETIMEDOUT : EIO;
+	goto error;
+    }
+    
+    EI_TRACE_CONN0("ei_accept","<- ACCEPT connected to remote");
+    
+    if (recv_name(fd, &her_version, &her_flags, &her_name, ms)) {
+	EI_TRACE_ERR0("ei_accept","<- ACCEPT initial ident failed");
+	goto error;
+    }
+    
+    if (her_version <= 4) {
+	EI_TRACE_ERR0("ei_accept","<- ACCEPT remote version not compatible");
+	goto error;
+    }
+    else {
+	unsigned our_challenge;
+	unsigned her_challenge;
+	unsigned char our_digest[16];
+	
+	if (send_status(fd,"ok", ms))
+	    goto error;
+	our_challenge = gen_challenge();
+	if (send_challenge(fd, ec->thisnodename, 
+	    our_challenge, her_version, ms))
+	    goto error;
+	if (recv_challenge_reply(fd, our_challenge, 
+	    ec->ei_connect_cookie, 
+	    &her_challenge, ms))
+	    goto error;
+	gen_digest(her_challenge, ec->ei_connect_cookie, our_digest);
+	if (send_challenge_ack(fd, our_digest, ms))
+	    goto error;
+	put_ei_socket_info(fd, her_version, null_cookie, ec);
+    }
+    if (conp) 
+	*conp = her_name;
+    
+    EI_TRACE_CONN1("ei_accept","<- ACCEPT (ok) remote = %s",her_name.nodename);
+
+    erl_errno = 0;		/* No error */
+    return fd;
+    
+error:
+    EI_TRACE_ERR0("ei_accept","<- ACCEPT failed");
+    closesocket(fd);
+    return ERL_ERROR;
+} /* ei_accept */
+
+
+/* Receives a message from an Erlang socket.
+ * If the message was a TICK it is immediately
+ * answered. Returns: ERL_ERROR, ERL_TICK or
+ * the number of bytes read.
+ */
+int ei_receive_tmo(int fd, unsigned char *bufp, int bufsize, unsigned ms) 
+{
+    int len;
+    unsigned char fourbyte[4]={0,0,0,0};
+    int res;
+ 
+    if ((res = ei_read_fill_t(fd, (char *) bufp, 4, ms))  != 4) {
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return ERL_ERROR;
+    }
+    
+    /* Tick handling */
+    if ((len = get_int32(bufp)) == ERL_TICK) 
+    {
+	ei_write_fill_t(fd, (char *) fourbyte, 4, ms);
+	/* FIXME ok to ignore error or timeout? */
+	erl_errno = EAGAIN;
+	return ERL_TICK;
+    }
+    else if (len > bufsize) 
+    {
+	/* FIXME: We should drain the message. */
+	erl_errno = EMSGSIZE;
+	return ERL_ERROR;
+    }
+    else if ((res = ei_read_fill_t(fd, (char *) bufp, len, ms)) != len)
+    {
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return ERL_ERROR;
+    }
+    
+    return len;
+    
+}
+
+int ei_receive(int fd, unsigned char *bufp, int bufsize) 
+{
+    return ei_receive_tmo(fd, bufp, bufsize, 0);
+} 
+
+int ei_reg_send_tmo(ei_cnode* ec, int fd, char *server_name,
+		    char* buf, int len, unsigned ms)
+{
+    erlang_pid *self = ei_self(ec);
+    self->num = fd;
+
+    /* erl_errno and return code is set by ei_reg_send_encoded_tmo() */
+    return ei_send_reg_encoded_tmo(fd, self, server_name, buf, len, ms);
+}
+
+
+int ei_reg_send(ei_cnode* ec, int fd, char *server_name, char* buf, int len)
+{
+    return ei_reg_send_tmo(ec,fd,server_name,buf,len,0);
+}
+
+/* 
+* Sends an Erlang message to a process at an Erlang node
+*/
+int ei_send_tmo(int fd, erlang_pid* to, char* buf, int len, unsigned ms)
+{
+    /* erl_errno and return code is set by ei_reg_send_encoded_tmo() */
+    return ei_send_encoded_tmo(fd, to, buf, len, ms);
+}
+
+int ei_send(int fd, erlang_pid* to, char* buf, int len)
+{
+    return ei_send_tmo(fd, to, buf, len, 0);
+}
+
+
+/* 
+* Try to receive an Erlang message on a given socket. Returns
+* ERL_TICK, ERL_MSG, or ERL_ERROR. Sets `erl_errno' on ERL_ERROR and
+* ERL_TICK (to EAGAIN in the latter case).
+*/
+
+int ei_do_receive_msg(int fd, int staticbuffer_p, 
+		      erlang_msg* msg, ei_x_buff* x, unsigned ms)
+{
+    int msglen;
+    int i;
+    
+    if (!(i=ei_recv_internal(fd, &x->buff, &x->buffsz, msg, &msglen, 
+	staticbuffer_p, ms))) {
+	erl_errno = EAGAIN;
+	return ERL_TICK;
+    }
+    if (i<0) {
+	/* erl_errno set by ei_recv_internal() */
+	return ERL_ERROR;
+    }
+    if (staticbuffer_p && msglen > x->buffsz)
+    {
+	erl_errno = EMSGSIZE;
+	return ERL_ERROR;
+    }
+    x->index = x->buffsz;
+    switch (msg->msgtype) {	/* FIXME are these all? */
+    case ERL_SEND:
+    case ERL_REG_SEND:
+    case ERL_LINK:
+    case ERL_UNLINK:
+    case ERL_GROUP_LEADER:
+    case ERL_EXIT:
+    case ERL_EXIT2:
+    case ERL_NODE_LINK:
+	return ERL_MSG;
+	
+    default:
+	/*if (emsg->to) 'erl'_free_term(emsg->to);
+	  if (emsg->from) 'erl'_free_term(emsg->from);
+	  if (emsg->msg) 'erl'_free_term(emsg->msg);
+	  emsg->to = NULL;
+	  emsg->from = NULL;
+	  emsg->msg = NULL;*/
+	
+	erl_errno = EIO;
+	return ERL_ERROR;
+    }
+} /* do_receive_msg */
+
+
+int ei_receive_msg(int fd, erlang_msg* msg, ei_x_buff* x)
+{
+    return ei_do_receive_msg(fd, 1, msg, x, 0);
+}
+
+int ei_xreceive_msg(int fd, erlang_msg *msg, ei_x_buff *x)
+{
+    return ei_do_receive_msg(fd, 0, msg, x, 0);
+}
+
+int ei_receive_msg_tmo(int fd, erlang_msg* msg, ei_x_buff* x, unsigned ms)
+{
+    return ei_do_receive_msg(fd, 1, msg, x, ms);
+}
+
+int ei_xreceive_msg_tmo(int fd, erlang_msg *msg, ei_x_buff *x, unsigned ms)
+{
+    return ei_do_receive_msg(fd, 0, msg, x, ms);
+}
+
+/* 
+* The RPC consists of two parts, send and receive.
+* Here is the send part ! 
+* { PidFrom, { call, Mod, Fun, Args, user }} 
+*/
+/*
+* Now returns non-negative number for success, negative for failure.
+*/
+int ei_rpc_to(ei_cnode *ec, int fd, char *mod, char *fun,
+	      const char *buf, int len)
+{
+
+    ei_x_buff x;
+    erlang_pid *self = ei_self(ec);
+    self->num = fd;
+
+    /* encode header */
+    ei_x_new_with_version(&x);
+    ei_x_encode_tuple_header(&x, 2);  /* A */
+    
+    self->num = fd;
+    ei_x_encode_pid(&x, self);	      /* A 1 */
+    
+    ei_x_encode_tuple_header(&x, 5);  /* B A 2 */
+    ei_x_encode_atom(&x, "call");     /* B 1 */
+    ei_x_encode_atom(&x, mod);	      /* B 2 */
+    ei_x_encode_atom(&x, fun);	      /* B 3 */
+    ei_x_append_buf(&x, buf, len);    /* B 4 */
+    ei_x_encode_atom(&x, "user");     /* B 5 */
+
+    /* ei_x_encode_atom(&x,"user"); */
+    ei_send_reg_encoded(fd, self, "rex", x.buff, x.index);
+    ei_x_free(&x);
+	
+    return 0;
+} /* rpc_to */
+
+  /*
+  * And here is the rpc receiving part. A negative
+  * timeout means 'infinity'. Returns either of: ERL_MSG,
+  * ERL_TICK, ERL_ERROR or ERL_TIMEOUT.
+*/
+int ei_rpc_from(ei_cnode *ec, int fd, int timeout, erlang_msg *msg,
+		ei_x_buff *x) 
+{
+    fd_set readmask;
+    struct timeval tv;
+    struct timeval *t = NULL;
+    
+    if (timeout >= 0) {
+	tv.tv_sec = timeout / 1000;
+	tv.tv_usec = (timeout % 1000) * 1000;
+	t = &tv;
+    }
+    
+    FD_ZERO(&readmask);
+    FD_SET(fd,&readmask);
+    
+    switch (select(fd+1, &readmask, NULL, NULL, t)) {
+    case -1: 
+	erl_errno = EIO;
+	return ERL_ERROR;
+	
+    case 0:
+	erl_errno = ETIMEDOUT;
+	return ERL_TIMEOUT;
+	
+    default:
+	if (FD_ISSET(fd, &readmask)) {
+	    return ei_xreceive_msg(fd, msg, x);
+	} else {
+	    erl_errno = EIO;
+	    return ERL_ERROR;
+	}
+    }
+} /* rpc_from */
+
+  /*
+  * A true RPC. It return a NULL pointer
+  * in case of failure, otherwise a valid
+  * (ETERM *) pointer containing the reply
+  */
+int ei_rpc(ei_cnode* ec, int fd, char *mod, char *fun,
+	   const char* inbuf, int inbuflen, ei_x_buff* x)
+{
+    int i, index;
+    ei_term t;
+    erlang_msg msg;
+    char rex[MAXATOMLEN+1];
+
+    if (ei_rpc_to(ec, fd, mod, fun, inbuf, inbuflen) < 0) {
+	return -1;
+    }
+    /* FIXME are we not to reply to the tick? */
+    while ((i = ei_rpc_from(ec, fd, ERL_NO_TIMEOUT, &msg, x)) == ERL_TICK)
+	;
+
+    if (i == ERL_ERROR)  return -1;
+    /*ep = 'erl'_element(2,emsg.msg);*/ /* {RPC_Tag, RPC_Reply} */
+    index = 0;
+    if (ei_decode_version(x->buff, &index, &i) < 0
+	|| ei_decode_ei_term(x->buff, &index, &t) < 0)
+	return -1;		/* FIXME ei_decode_version don't set erl_errno as before */
+    /* FIXME this is strange, we don't check correct "rex" atom
+       and we let it pass if not ERL_SMALL_TUPLE_EXT and arity == 2 */
+    if (t.ei_type == ERL_SMALL_TUPLE_EXT && t.arity == 2)
+	if (ei_decode_atom(x->buff, &index, rex) < 0)
+	    return -1;
+    /* remove header */
+    x->index -= index;
+    memmove(x->buff, &x->buff[index], x->index);
+    return 0;
+}
+
+
+  /*
+  ** Handshake
+*/
+
+
+/* FROM RTP RFC 1889  (except that we use all bits, bug in RFC?) */
+static unsigned int md_32(char* string, int length)
+{
+    MD5_CTX ctx;
+    union {
+	char c[16];
+	unsigned x[4];
+    } digest;
+    ei_MD5Init(&ctx);
+    ei_MD5Update(&ctx, (unsigned char *) string, 
+	       (unsigned) length);
+    ei_MD5Final((unsigned char *) digest.c, &ctx);
+    return (digest.x[0] ^ digest.x[1] ^ digest.x[2] ^ digest.x[3]);
+}
+
+#if defined(__WIN32__)
+unsigned int gen_challenge(void)
+{
+    struct {
+	SYSTEMTIME tv;
+	DWORD cpu;
+	int pid;
+    } s;
+    GetSystemTime(&s.tv);
+    s.cpu  = GetTickCount();
+    s.pid  = getpid();
+    return md_32((char*) &s, sizeof(s));
+}
+
+#elif  defined(VXWORKS)
+
+static unsigned int gen_challenge(void)
+{
+    struct {
+	struct timespec tv;
+	clock_t cpu;
+	int pid;
+    } s;
+    s.cpu  = clock();
+    clock_gettime(CLOCK_REALTIME, &s.tv);
+    s.pid = getpid();
+    return md_32((char*) &s, sizeof(s));
+}
+
+#else  /* some unix */
+
+static unsigned int gen_challenge(void)
+{
+    struct {
+	struct timeval tv;
+	clock_t cpu;
+	pid_t pid;
+	u_long hid;
+	uid_t uid;
+	gid_t gid;
+	struct utsname name;
+    } s;
+
+    gettimeofday(&s.tv, 0);
+    uname(&s.name);
+    s.cpu  = clock();
+    s.pid  = getpid();
+    s.hid  = gethostid();
+    s.uid  = getuid();
+    s.gid  = getgid();
+
+    return md_32((char*) &s, sizeof(s));
+}
+#endif
+
+static void gen_digest(unsigned challenge, char cookie[], 
+		       unsigned char digest[16])
+{
+    MD5_CTX c;
+    
+    char chbuf[21];
+    
+    sprintf(chbuf,"%u", challenge);
+    ei_MD5Init(&c);
+    ei_MD5Update(&c, (unsigned char *) cookie, 
+	       (unsigned) strlen(cookie));
+    ei_MD5Update(&c, (unsigned char *) chbuf, 
+	       (unsigned) strlen(chbuf));
+    ei_MD5Final(digest, &c);
+}
+
+
+static char *hex(char digest[16], char buff[33])
+{
+    static char tab[] = "0123456789abcdef";
+    unsigned char *d = (unsigned char *) digest;
+    //static char buff[sizeof(digest)*2 + 1];
+    char *p = buff;
+    int i;
+    
+    for (i = 0; i < sizeof(digest); ++i) {
+	*p++ = tab[(int)((*d) >> 4)];
+	*p++ = tab[(int)((*d++) & 0xF)];
+    }
+    *p = '\0';
+    return buff;
+}
+
+static int read_2byte_package(int fd, char **buf, int *buflen, 
+			      int *is_static, unsigned ms)
+{
+    unsigned char nbuf[2];
+    unsigned char *x = nbuf;
+    unsigned len;
+    int res;
+    
+    if((res = ei_read_fill_t(fd, (char *)nbuf, 2, ms)) != 2) {
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    len = get16be(x);
+    
+    if (len > *buflen) {
+	if (*is_static) {
+	    char *tmp = malloc(len);
+	    if (!tmp) {
+		erl_errno = ENOMEM;
+		return -1;
+	    }
+	    *buf = tmp;
+	    *is_static = 0;
+	    *buflen = len;
+	} else {
+	    char *tmp = realloc(*buf, len);
+	    if (!tmp) {
+		erl_errno = ENOMEM;
+		return -1;
+	    }
+	    *buf = tmp;
+	    *buflen = len;
+	}
+    }
+    if ((res = ei_read_fill_t(fd, *buf, len, ms)) != len) {
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    return len;
+}
+
+
+static int send_status(int fd, char *status, unsigned ms)
+{
+    char *buf, *s;
+    char dbuf[DEFBUF_SIZ];
+    int siz = strlen(status) + 1 + 2;
+    int res;
+
+    buf = (siz > DEFBUF_SIZ) ? malloc(siz) : dbuf;
+    if (!buf) {
+	erl_errno = ENOMEM;
+	return -1;
+    }
+    s = buf;
+    put16be(s,siz - 2);
+    put8(s, 's');
+    memcpy(s, status, strlen(status));
+    if ((res = ei_write_fill_t(fd, buf, siz, ms)) != siz) {
+	EI_TRACE_ERR0("send_status","-> SEND_STATUS socket write failed");
+	if (buf != dbuf)
+	    free(buf);
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    EI_TRACE_CONN1("send_status","-> SEND_STATUS (%s)",status);
+
+    if (buf != dbuf)
+	free(buf);
+    return 0;
+}
+
+static int recv_status(int fd, unsigned ms)
+{
+    char dbuf[DEFBUF_SIZ];
+    char *buf = dbuf;
+    int is_static = 1;
+    int buflen = DEFBUF_SIZ;
+    int rlen;
+    
+    if ((rlen = read_2byte_package(fd, &buf, &buflen, &is_static, ms)) <= 0) {
+	EI_TRACE_ERR1("recv_status",
+		      "<- RECV_STATUS socket read failed (%d)", rlen);
+	goto error;
+    }
+    if (rlen == 3 && buf[0] == 's' && buf[1] == 'o' && 
+	buf[2] == 'k') {
+	if (!is_static)
+	    free(buf);
+	EI_TRACE_CONN0("recv_status","<- RECV_STATUS (ok)");
+	return 0;
+    }
+error:
+    if (!is_static)
+	free(buf);
+    return -1;
+}
+
+/* FIXME fix the signed/unsigned mess..... */
+
+static int send_name_or_challenge(int fd, char *nodename,
+				  int f_chall,
+				  unsigned challenge,
+				  unsigned version,
+				  unsigned ms) 
+{
+    char *buf;
+    unsigned char *s;
+    char dbuf[DEFBUF_SIZ];
+    int siz = 2 + 1 + 2 + 4 + strlen(nodename);
+    const char* function[] = {"SEND_NAME", "SEND_CHALLENGE"};
+    int res;
+
+    if (f_chall)
+	siz += 4;
+    buf = (siz > DEFBUF_SIZ) ? malloc(siz) : dbuf;
+    if (!buf) {
+	erl_errno = ENOMEM;
+	return -1;
+    }
+    s = (unsigned char *)buf;
+    put16be(s,siz - 2);
+    put8(s, 'n');
+    put16be(s, version);
+    put32be(s, (DFLAG_EXTENDED_REFERENCES
+		| DFLAG_EXTENDED_PIDS_PORTS
+		| DFLAG_FUN_TAGS
+		| DFLAG_NEW_FUN_TAGS));
+    if (f_chall)
+	put32be(s, challenge);
+    memcpy(s, nodename, strlen(nodename));
+    
+    if ((res = ei_write_fill_t(fd, buf, siz, ms)) != siz) {
+	EI_TRACE_ERR1("send_name_or_challenge",
+		      "-> %s socket write failed", function[f_chall]);
+	if (buf != dbuf)
+	    free(buf);
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    
+    if (buf != dbuf)
+	free(buf);
+    return 0;
+}
+
+static int recv_challenge(int fd, unsigned *challenge, 
+			  unsigned *version,
+			  unsigned *flags, ErlConnect *namebuf, unsigned ms)
+{
+    char dbuf[DEFBUF_SIZ];
+    char *buf = dbuf;
+    int is_static = 1;
+    int buflen = DEFBUF_SIZ;
+    int rlen;
+    char *s;
+    struct sockaddr_in sin;
+    socklen_t sin_len = sizeof(sin);
+    char tag;
+    
+    erl_errno = EIO;		/* Default */
+
+    if ((rlen = read_2byte_package(fd, &buf, &buflen, &is_static, ms)) <= 0) {
+	EI_TRACE_ERR1("recv_challenge",
+		      "<- RECV_CHALLENGE socket read failed (%d)",rlen);
+	goto error;
+    }
+    if ((rlen - 11) > MAXNODELEN) {
+	EI_TRACE_ERR1("recv_challenge",
+		      "<- RECV_CHALLENGE nodename too long (%d)",rlen - 11);
+	goto error;
+    }
+    s = buf;
+    if ((tag = get8(s)) != 'n') {
+	EI_TRACE_ERR2("recv_challenge",
+		      "<- RECV_CHALLENGE incorrect tag, "
+		      "expected 'n' got '%c' (%u)",tag,tag);
+	goto error;
+    }
+    *version = get16be(s);
+    *flags = get32be(s);
+    *challenge = get32be(s);
+
+    if (!(*flags & DFLAG_EXTENDED_REFERENCES)) {
+	EI_TRACE_ERR0("recv_challenge","<- RECV_CHALLENGE peer cannot "
+		      "handle extended references");
+	goto error;
+    }
+
+    if (!(*flags & DFLAG_EXTENDED_PIDS_PORTS)
+	&& !ei_internal_use_r9_pids_ports()) {
+	EI_TRACE_ERR0("recv_challenge","<- RECV_CHALLENGE peer cannot "
+		      "handle extended pids and ports");
+	erl_errno = EIO;
+	goto error;
+    }
+	    
+
+    if (getpeername(fd, (struct sockaddr *) &sin, &sin_len) < 0) {
+	EI_TRACE_ERR0("recv_challenge","<- RECV_CHALLENGE can't get peername");
+	erl_errno = errno;
+	goto error;
+    }
+    memcpy(namebuf->ipadr, &(sin.sin_addr.s_addr), 
+	sizeof(sin.sin_addr.s_addr));
+    memcpy(namebuf->nodename, s, rlen - 11);
+    namebuf->nodename[rlen - 11] = '\0';
+    if (!is_static)
+	free(buf);
+    EI_TRACE_CONN4("recv_challenge","<- RECV_CHALLENGE (ok) node = %s, "
+	    "version = %u, "
+	    "flags = %u, "
+	    "challenge = %d",
+	    namebuf->nodename,
+	    *version,
+	    *flags,
+	    *challenge
+	    );
+    erl_errno = 0;
+    return 0;
+error:
+    if (!is_static)
+	free(buf);
+    return -1;
+}
+
+static int send_challenge_reply(int fd, unsigned char digest[16], 
+				unsigned challenge, unsigned ms) 
+{
+    char *s;
+    char buf[DEFBUF_SIZ];
+    int siz = 2 + 1 + 4 + 16;
+    int res;
+
+    s = buf;
+    put16be(s,siz - 2);
+    put8(s, 'r');
+    put32be(s, challenge);
+    memcpy(s, digest, 16);
+    
+    if ((res = ei_write_fill_t(fd, buf, siz, ms)) != siz) {
+	EI_TRACE_ERR0("send_challenge_reply",
+		      "-> SEND_CHALLENGE_REPLY socket write failed");
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    
+    if (ei_tracelevel >= 3) {
+	char buffer[33];	
+   	EI_TRACE_CONN2("send_challenge_reply",
+		   "-> SEND_CHALLENGE_REPLY (ok) challenge = %d, digest = %s",
+		   challenge,hex((char*)digest, buffer));
+    }
+    return 0;
+}
+
+static int recv_challenge_reply (int fd, 
+				 unsigned our_challenge,
+				 char cookie[], 
+				 unsigned *her_challenge,
+				 unsigned ms)
+{
+    char dbuf[DEFBUF_SIZ];
+    char *buf = dbuf;
+    int is_static = 1;
+    int buflen = DEFBUF_SIZ;
+    int rlen;
+    char *s;
+    char tag;
+    char her_digest[16], expected_digest[16];
+    
+    erl_errno = EIO;		/* Default */
+
+    if ((rlen = read_2byte_package(fd, &buf, &buflen, &is_static, ms)) != 21) {
+	EI_TRACE_ERR1("recv_challenge_reply",
+		      "<- RECV_CHALLENGE_REPLY socket read failed (%d)",rlen);
+	goto error;
+    }
+    
+    s = buf;
+    if ((tag = get8(s)) != 'r') {
+	EI_TRACE_ERR2("recv_challenge_reply",
+		      "<- RECV_CHALLENGE_REPLY incorrect tag, "
+		      "expected 'r' got '%c' (%u)",tag,tag);
+	goto error;
+    }
+    *her_challenge = get32be(s);
+    memcpy(her_digest, s, 16);
+    gen_digest(our_challenge, cookie, (unsigned char*)expected_digest);
+    if (memcmp(her_digest, expected_digest, 16)) {
+	EI_TRACE_ERR0("recv_challenge_reply",
+		      "<- RECV_CHALLENGE_REPLY authorization failure");
+	goto error;
+    }
+    if (!is_static)
+	free(buf);
+
+   
+    if (ei_tracelevel >= 3) {
+	char buffer[33];	
+        EI_TRACE_CONN2("recv_challenge_reply",
+		   "<- RECV_CHALLENGE_REPLY (ok) challenge = %u, digest = %s",
+		   *her_challenge,hex(her_digest,buffer));
+    }
+    erl_errno = 0;
+    return 0;
+    
+error:
+    if (!is_static)
+	free(buf);
+    return -1;
+}
+
+static int send_challenge_ack(int fd, unsigned char digest[16], unsigned ms) 
+{
+    char *s;
+    char buf[DEFBUF_SIZ];
+    int siz = 2 + 1 + 16;
+    int res;
+
+    s = buf;
+    
+    put16be(s,siz - 2);
+    put8(s, 'a');
+    memcpy(s, digest, 16);
+
+    if ((res = ei_write_fill_t(fd, buf, siz, ms)) != siz) {
+	EI_TRACE_ERR0("recv_challenge_reply",
+		      "-> SEND_CHALLENGE_ACK socket write failed");
+	erl_errno = (res == -2) ? ETIMEDOUT : EIO;
+	return -1;
+    }
+    
+    if (ei_tracelevel >= 3) {
+	char buffer[33];	
+    	EI_TRACE_CONN1("recv_challenge_reply",
+		   "-> SEND_CHALLENGE_ACK (ok) digest = %s",hex((char *)digest,buffer));
+    }
+    
+    return 0;
+}
+
+static int recv_challenge_ack(int fd, 
+			      unsigned our_challenge,
+			      char cookie[], unsigned ms)
+{
+    char dbuf[DEFBUF_SIZ];
+    char *buf = dbuf;
+    int is_static = 1;
+    int buflen = DEFBUF_SIZ;
+    int rlen;
+    char *s;
+    char tag;
+    char her_digest[16], expected_digest[16];
+    
+    erl_errno = EIO;		/* Default */
+
+    if ((rlen = read_2byte_package(fd, &buf, &buflen, &is_static, ms)) != 17) {
+	EI_TRACE_ERR1("recv_challenge_ack",
+		      "<- RECV_CHALLENGE_ACK socket read failed (%d)",rlen);
+	goto error;
+    }
+    
+    s = buf;
+    if ((tag = get8(s)) != 'a') {
+	EI_TRACE_ERR2("recv_challenge_ack",
+		      "<- RECV_CHALLENGE_ACK incorrect tag, "
+		      "expected 'a' got '%c' (%u)",tag,tag);
+	goto error;
+    }
+    memcpy(her_digest, s, 16);
+    gen_digest(our_challenge, cookie, (unsigned char *)expected_digest);
+    if (memcmp(her_digest, expected_digest, 16)) {
+	EI_TRACE_ERR0("recv_challenge_ack",
+		      "<- RECV_CHALLENGE_ACK authorization failure");
+	goto error;
+    }
+    if (!is_static)
+	free(buf);
+
+    if (ei_tracelevel >= 3) {
+	char buffer[33];	
+	EI_TRACE_CONN1("recv_challenge_ack",
+		   "<- RECV_CHALLENGE_ACK (ok) digest = %s",hex(her_digest,buffer));
+    }
+    erl_errno = 0;
+    return 0;
+
+error:
+    if (!is_static)
+	free(buf);
+    return -1;
+}
+
+static int send_name(int fd, char *nodename, unsigned version, unsigned ms) 
+{
+    return send_name_or_challenge(fd, nodename, 0, 0, version, ms);
+}
+
+static int send_challenge(int fd, char *nodename, 
+			  unsigned challenge, unsigned version, unsigned ms)
+{
+    return send_name_or_challenge(fd, nodename, 1, challenge, version, ms);
+}
+
+static int recv_name(int fd, 
+		     unsigned *version,
+		     unsigned *flags, ErlConnect *namebuf, unsigned ms)
+{
+    char dbuf[DEFBUF_SIZ];
+    char *buf = dbuf;
+    int is_static = 1;
+    int buflen = DEFBUF_SIZ;
+    int rlen;
+    char *s;
+    struct sockaddr_in sin;
+    socklen_t sin_len = sizeof(sin);
+    char tag;
+    
+    erl_errno = EIO;		/* Default */
+
+    if ((rlen = read_2byte_package(fd, &buf, &buflen, &is_static, ms)) <= 0) {
+	EI_TRACE_ERR1("recv_name","<- RECV_NAME socket read failed (%d)",rlen);
+	goto error;
+    }
+    if ((rlen - 7) > MAXNODELEN) {
+	EI_TRACE_ERR1("recv_name","<- RECV_NAME nodename too long (%d)",rlen-7);
+	goto error;
+    }
+    s = buf;
+    tag = get8(s);
+    if (tag != 'n') {
+	EI_TRACE_ERR2("recv_name","<- RECV_NAME incorrect tag, "
+		      "expected 'n' got '%c' (%u)",tag,tag);
+	goto error;
+    }
+    *version = get16be(s);
+    *flags = get32be(s);
+
+    if (!(*flags & DFLAG_EXTENDED_REFERENCES)) {
+	EI_TRACE_ERR0("recv_name","<- RECV_NAME peer cannot handle"
+		      "extended references");
+	goto error;
+    }
+
+    if (!(*flags & DFLAG_EXTENDED_PIDS_PORTS)
+	&& !ei_internal_use_r9_pids_ports()) {
+	EI_TRACE_ERR0("recv_name","<- RECV_NAME peer cannot "
+		      "handle extended pids and ports");
+	erl_errno = EIO;
+	goto error;
+    }
+	  
+    if (getpeername(fd, (struct sockaddr *) &sin, &sin_len) < 0) {
+	EI_TRACE_ERR0("recv_name","<- RECV_NAME can't get peername");
+	erl_errno = errno;
+	goto error;
+    }
+    memcpy(namebuf->ipadr, &(sin.sin_addr.s_addr), 
+	sizeof(sin.sin_addr.s_addr));
+    memcpy(namebuf->nodename, s, rlen - 7);
+    namebuf->nodename[rlen - 7] = '\0';
+    if (!is_static)
+	free(buf);
+    EI_TRACE_CONN3("recv_name",
+		   "<- RECV_NAME (ok) node = %s, version = %u, flags = %u",
+		   namebuf->nodename,*version,*flags);
+    erl_errno = 0;
+    return 0;
+    
+error:
+    if (!is_static)
+	free(buf);
+    return -1;
+}
+
+/***************************************************************************
+ *
+ *  Returns 1 on success and 0 on failure.
+ *
+ ***************************************************************************/
+
+
+/* size is the buffer size, e.i. string length + 1 */
+
+static int get_home(char *buf, int size)
+{
+    char* homedrive;
+    char* homepath;
+    
+#ifdef __WIN32__
+    homedrive = getenv("HOMEDRIVE");
+    homepath = getenv("HOMEPATH");
+#else
+    homedrive = "";
+    homepath = getenv("HOME");
+#endif
+    
+    if (!homedrive || !homepath) {
+	buf[0] = '.';
+	buf[1] = '\0';
+	return 1;
+    } else if (strlen(homedrive)+strlen(homepath) < size-1) {
+	strcpy(buf, homedrive);
+	strcat(buf, homepath);
+	return 1;
+    }
+    
+    return 0;
+}
+
+
+static int get_cookie(char *buf, int bufsize)
+{
+    char fname[EI_MAX_HOME_PATH + sizeof(COOKIE_FILE) + 1];
+    int fd;
+    int len;
+    unsigned char next_c;
+    
+    if (!get_home(fname, EI_MAX_HOME_PATH+1)) {
+	fprintf(stderr,"<ERROR> get_cookie: too long path to home");
+	return 0;
+    }
+
+    strcat(fname, COOKIE_FILE);
+    if ((fd = open(fname, O_RDONLY, 0777)) < 0) {
+	fprintf(stderr,"<ERROR> get_cookie: can't open cookie file");
+	return 0;
+    }
+    
+    if ((len = read(fd, buf, bufsize-1)) < 0) {
+	fprintf(stderr,"<ERROR> get_cookie: reading cookie file");
+	close(fd);
+	return 0;
+    }
+
+    /* If more to read it is too long. Not 100% correct test but will do. */
+    if (read(fd, &next_c, 1) > 0 && !isspace(next_c)) {
+	fprintf(stderr,"<ERROR> get_cookie: cookie in %s is too long",fname);
+	close(fd);
+	return 0;
+    }
+
+    close(fd);
+
+    /* Remove all newlines after the first newline */
+    buf[len] = '\0';		/* Terminate string */
+    len = strcspn(buf,"\r\n");
+    buf[len] = '\0';		/* Terminate string again */
+
+    return 1;			/* Success! */
+}