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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2000-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions 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/times.h>
#include <unistd.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/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 <stddef.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
#define EI_SOCKET_CALLBACKS_SZ_V1 \
(offsetof(ei_socket_callbacks, get_fd) \
+ sizeof(int (*)(void *)))
/* 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(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, char *status, unsigned ms);
static int recv_status(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned ms);
static int send_challenge(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
char *nodename, unsigned challenge,
unsigned version, unsigned ms);
static int recv_challenge(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
unsigned *challenge, unsigned *version,
unsigned *flags, char *namebuf, unsigned ms);
static int send_challenge_reply(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned char digest[16],
unsigned challenge, unsigned ms);
static int recv_challenge_reply(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned our_challenge,
char cookie[],
unsigned *her_challenge, unsigned ms);
static int send_challenge_ack(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned char digest[16],
unsigned ms);
static int recv_challenge_ack(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned our_challenge,
char cookie[], unsigned ms);
static int send_name(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
char *nodename, unsigned version, unsigned ms);
static int recv_name(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
unsigned *version, unsigned *flags, char *namebuf,
unsigned ms);
static struct hostent*
dyn_gethostbyname_r(const char *name, struct hostent *hostp, char **buffer_p,
int buflen, int *h_errnop);
static void abort_connection(ei_socket_callbacks *cbs, void *ctx);
static int close_connection(ei_socket_callbacks *cbs, void *ctx, int fd);
static char *
estr(int e)
{
char *str = strerror(e);
if (!str)
return "unknown error";
return str;
}
/***************************************************************************
*
* 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;
ei_socket_callbacks *cbs;
void *ctx;
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;
/***************************************************************************
*
* XXX
*
***************************************************************************/
#ifndef ETHR_HAVE___atomic_compare_exchange_n
# define ETHR_HAVE___atomic_compare_exchange_n 0
#endif
#ifndef ETHR_HAVE___atomic_load_n
# define ETHR_HAVE___atomic_load_n 0
#endif
#ifndef ETHR_HAVE___atomic_store_n
# define ETHR_HAVE___atomic_store_n 0
#endif
#if defined(_REENTRANT) \
&& (!(ETHR_HAVE___atomic_compare_exchange_n & SIZEOF_VOID_P) \
|| !(ETHR_HAVE___atomic_load_n & SIZEOF_VOID_P) \
|| !(ETHR_HAVE___atomic_store_n & SIZEOF_VOID_P))
# undef EI_DISABLE_SEQ_SOCKET_INFO
# define EI_DISABLE_SEQ_SOCKET_INFO
#endif
#ifdef __WIN32__
# undef EI_DISABLE_SEQ_SOCKET_INFO
# define EI_DISABLE_SEQ_SOCKET_INFO
#endif
#ifndef EI_DISABLE_SEQ_SOCKET_INFO
#ifdef _REENTRANT
#define EI_ATOMIC_CMPXCHG_ACQ_REL(VARP, XCHGP, NEW) \
__atomic_compare_exchange_n((VARP), (XCHGP), (NEW), 0, \
__ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE)
#define EI_ATOMIC_LOAD_ACQ(VARP) \
__atomic_load_n((VARP), __ATOMIC_ACQUIRE)
#define EI_ATOMIC_STORE_REL(VARP, NEW) \
__atomic_store_n((VARP), (NEW), __ATOMIC_RELEASE)
#else /* ! _REENTRANT */
#define EI_ATOMIC_CMPXCHG_ACQ_REL(VARP, XCHGP, NEW) \
(*(VARP) == *(XCHGP) \
? ((*(VARP) = (NEW)), !0) \
: ((*(XCHGP) = *(VARP)), 0))
#define EI_ATOMIC_LOAD_ACQ(VARP) (*(VARP))
#define EI_ATOMIC_STORE_REL(VARP, NEW) (*(VARP) = (NEW))
#endif /* ! _REENTRANT */
#define EI_SOCKET_INFO_SEG_BITS 5
#define EI_SOCKET_INFO_SEG_SIZE (1 << EI_SOCKET_INFO_SEG_BITS)
#define EI_SOCKET_INFO_SEG_MASK (EI_SOCKET_INFO_SEG_SIZE - 1)
typedef struct {
int max_fds;
ei_socket_info *segments[1]; /* Larger in reality... */
} ei_socket_info_data__;
static ei_socket_info_data__ *socket_info_data = NULL;
static int init_socket_info(void)
{
int max_fds;
int i;
size_t segments_len;
ei_socket_info_data__ *info_data, *xchg;
if (EI_ATOMIC_LOAD_ACQ(&socket_info_data) != NULL)
return !0; /* Already initialized... */
#if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
max_fds = sysconf(_SC_OPEN_MAX);
#else
max_fds = 1024;
#endif
if (max_fds < 0)
return 0;
segments_len = ((max_fds-1)/EI_SOCKET_INFO_SEG_SIZE + 1);
info_data = malloc(sizeof(ei_socket_info_data__)
+ (sizeof(ei_socket_info *)*(segments_len-1)));
if (!info_data)
return 0;
info_data->max_fds = max_fds;
for (i = 0; i < segments_len; i++)
info_data->segments[i] = NULL;
xchg = NULL;
if (!EI_ATOMIC_CMPXCHG_ACQ_REL(&socket_info_data, &xchg, info_data))
free(info_data); /* Already initialized... */
return !0;
}
static int put_ei_socket_info(int fd, int dist_version, char* cookie, ei_cnode *ec,
ei_socket_callbacks *cbs, void *ctx)
{
int six;
ei_socket_info *seg, *si;
int socket;
if (fd < 0 || socket_info_data->max_fds <= fd)
return -1;
socket = fd;
six = fd >> EI_SOCKET_INFO_SEG_BITS;
seg = EI_ATOMIC_LOAD_ACQ(&socket_info_data->segments[six]);
if (!seg) {
ei_socket_info *xchg;
int i;
seg = malloc(sizeof(ei_socket_info)*EI_SOCKET_INFO_SEG_SIZE);
if (!seg)
return -1;
for (i = 0; i < EI_SOCKET_INFO_SEG_SIZE; i++) {
seg[i].socket = -1;
}
xchg = NULL;
if (!EI_ATOMIC_CMPXCHG_ACQ_REL(&socket_info_data->segments[six], &xchg, seg)) {
free(seg);
seg = xchg;
}
}
si = &seg[fd & EI_SOCKET_INFO_SEG_MASK];
if (dist_version < 0) {
socket = -1;
si->cbs = NULL;
si->ctx = NULL;
}
else {
si->dist_version = dist_version;
si->cnode = *ec;
si->cbs = cbs;
si->ctx = ctx;
strcpy(si->cookie, cookie);
}
EI_ATOMIC_STORE_REL(&si->socket, socket);
return 0;
}
static ei_socket_info* get_ei_socket_info(int fd)
{
int six, socket;
ei_socket_info *seg, *si;
if (fd < 0 || socket_info_data->max_fds <= fd)
return NULL;
six = fd >> EI_SOCKET_INFO_SEG_BITS;
seg = EI_ATOMIC_LOAD_ACQ(&socket_info_data->segments[six]);
if (!seg)
return NULL;
si = &seg[fd & EI_SOCKET_INFO_SEG_MASK];
socket = EI_ATOMIC_LOAD_ACQ(&si->socket);
if (socket != fd)
return NULL;
return si;
}
#else /* EI_DISABLE_SEQ_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 */
static int init_socket_info(void)
{
#ifdef _REENTRANT
if (ei_sockets_lock == NULL) {
ei_sockets_lock = ei_mutex_create();
}
#endif /* _REENTRANT */
return !0;
}
static int put_ei_socket_info(int fd, int dist_version, char* cookie, ei_cnode *ec,
ei_socket_callbacks *cbs, void *ctx)
{
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].cbs = cbs;
ei_sockets[i].ctx = ctx;
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[ei_n_sockets].cnode = *ec;
ei_sockets[ei_n_sockets].cbs = cbs;
ei_sockets[ei_n_sockets].ctx = ctx;
strcpy(ei_sockets[ei_n_sockets].cookie, cookie);
++ei_n_sockets;
}
#ifdef _REENTRANT
ei_mutex_unlock(ei_sockets_lock);
#endif /* _REENTRANT */
return 0;
}
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;
}
#endif /* EI_DISABLE_SEQ_SOCKET_INFO */
static int remove_ei_socket_info(int fd)
{
return put_ei_socket_info(fd, -1, NULL, NULL, NULL, 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;
}
int ei_get_cbs_ctx__(ei_socket_callbacks **cbs, void **ctx, int fd)
{
ei_socket_info *sockinfo = get_ei_socket_info(fd);
if (sockinfo) {
*cbs = sockinfo->cbs;
*ctx = sockinfo->ctx;
return 0;
}
*cbs = NULL;
*ctx = NULL;
return EBADF;
}
/***************************************************************************
* Get/Set tracelevel
***************************************************************************/
void ei_set_tracelevel(int level) {
ei_tracelevel = level;
}
int ei_get_tracelevel(void) {
return ei_tracelevel;
}
/***************************************************************************
* Distversion
***************************************************************************/
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;
}
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;
static LONG volatile initialized = 0;
wVersionRequested = MAKEWORD(1, 1);
if (InterlockedCompareExchange((LPLONG) &initialized,1L,0L) == 0L) {
/* 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);
initialized = 2L;
return 0;
}
if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) {
EI_TRACE_ERR0("initWinSock","ERROR: this version of windows "
"sockets not supported");
WSACleanup();
initialized = 2L;
return 0;
}
initialized = 3L;
} else while (initialized < 2) {
SwitchToThread();
}
return (int) (initialized - 2);
}
#endif
/*
* Perhaps run this routine instead of ei_connect_init/2 ?
* Initailize by setting:
* thishostname, thisalivename, thisnodename and thisipaddr
*/
int ei_connect_xinit_ussi(ei_cnode* ec, const char *thishostname,
const char *thisalivename, const char *thisnodename,
Erl_IpAddr thisipaddr, const char *cookie,
const short creation, ei_socket_callbacks *cbs,
int cbs_sz, void *setup_context)
{
char *dbglevel;
if (cbs != &ei_default_socket_callbacks)
EI_SET_HAVE_PLUGIN_SOCKET_IMPL__;
/* 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
if (!init_socket_info()) {
EI_TRACE_ERR0("ei_connect_xinit","can't initiate socket info");
return ERL_ERROR;
}
if (cbs_sz < EI_SOCKET_CALLBACKS_SZ_V1) {
EI_TRACE_ERR0("ei_connect_xinit","invalid size of ei_socket_callbacks struct");
return ERL_ERROR;
}
ec->creation = creation & 0x3; /* 2 bits */
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 & 0x3; /* 2 bits */
ec->cbs = cbs;
ec->setup_context = setup_context;
if ((dbglevel = getenv("EI_TRACELEVEL")) != NULL ||
(dbglevel = getenv("ERL_DEBUG_DIST")) != NULL)
ei_tracelevel = atoi(dbglevel);
return 0;
}
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)
{
return ei_connect_xinit_ussi(ec, thishostname, thisalivename, thisnodename,
thisipaddr, cookie, creation,
&ei_default_socket_callbacks,
sizeof(ei_default_socket_callbacks),
NULL);
}
/*
* Initialize by set: thishostname, thisalivename,
* thisnodename and thisipaddr. At success return 0,
* otherwise return -1.
*/
int ei_connect_init_ussi(ei_cnode* ec, const char* this_node_name,
const char *cookie, short creation,
ei_socket_callbacks *cbs, int cbs_sz,
void *setup_context)
{
char thishostname[EI_MAXHOSTNAMELEN+1];
char thisnodename[MAXNODELEN+1];
char thisalivename[EI_MAXALIVELEN+1];
struct hostent host, *hp;
char buffer[1024];
char *buf = buffer;
int ei_h_errno;
int res;
#ifdef __WIN32__
if (!initWinSock()) {
EI_TRACE_ERR0("ei_connect_xinit","can't initiate winsock");
return ERL_ERROR;
}
#endif /* win32 */
/* gethostname requires len to be max(hostname) + 1 */
if (gethostname(thishostname, EI_MAXHOSTNAMELEN+1) == -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 if (strlen(this_node_name) >= sizeof(thisalivename)) {
EI_TRACE_ERR0("ei_connect_init","ERROR: this_node_name too long");
return ERL_ERROR;
} else {
strcpy(thisalivename, this_node_name);
}
hp = dyn_gethostbyname_r(thishostname,&host,&buf,sizeof(buffer),&ei_h_errno);
if (hp == NULL) {
/* Looking up IP given hostname fails. We must be on a standalone
host so let's use loopback for communication instead. */
hp = dyn_gethostbyname_r("localhost", &host, &buf, sizeof(buffer),
&ei_h_errno);
if (hp == NULL) {
#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);
}
}
res = ei_connect_xinit_ussi(ec, thishostname, thisalivename, thisnodename,
(struct in_addr *)*hp->h_addr_list, cookie, creation,
cbs, cbs_sz, setup_context);
if (buf != buffer)
free(buf);
return res;
}
int ei_connect_init(ei_cnode* ec, const char* this_node_name,
const char *cookie, short creation)
{
return ei_connect_init_ussi(ec, this_node_name, cookie, creation,
&ei_default_socket_callbacks,
sizeof(ei_default_socket_callbacks),
NULL);
}
/*
* Same as ei_gethostbyname_r, but also handles ERANGE error
* and may allocate larger buffer with malloc.
*/
static
struct hostent *dyn_gethostbyname_r(const char *name,
struct hostent *hostp,
char **buffer_p,
int buflen,
int *h_errnop)
{
#ifdef __WIN32__
/*
* Apparently ei_gethostbyname_r not implemented for Windows (?)
* Fall back on ei_gethostbyname like before.
*/
return ei_gethostbyname(name);
#else
char* buf = *buffer_p;
struct hostent *hp;
while (1) {
hp = ei_gethostbyname_r(name, hostp, buf, buflen, h_errnop);
if (hp) {
*buffer_p = buf;
break;
}
if (*h_errnop != ERANGE) {
if (buf != *buffer_p)
free(buf);
break;
}
buflen *= 2;
if (buf == *buffer_p)
buf = malloc(buflen);
else {
char* buf2 = realloc(buf, buflen);
if (buf2)
buf = buf2;
else {
free(buf);
buf = NULL;
}
}
if (!buf) {
*h_errnop = ENOMEM;
break;
}
}
return hp;
#endif
}
/*
* 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];
char *buf = buffer;
int ei_h_errno;
#endif /* !win32 */
int res;
/* 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 = dyn_gethostbyname_r(hostname,&host,&buf,sizeof(buffer),&ei_h_errno);
if (hp == NULL) {
char thishostname[EI_MAXHOSTNAMELEN+1];
/* gethostname requies len to be max(hostname) + 1*/
if (gethostname(thishostname,EI_MAXHOSTNAMELEN+1) < 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 = dyn_gethostbyname_r("localhost",&host,&buf,sizeof(buffer),&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];
/* gethostname requires len to be max(hostname) + 1 */
if (gethostname(thishostname,EI_MAXHOSTNAMELEN+1) < 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 */
res = ei_xconnect_tmo(ec, (Erl_IpAddr) *hp->h_addr_list, alivename, ms);
#ifndef __WIN32__
if (buf != buffer)
free(buf);
#endif
return res;
} /* 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 ip_addr, char *alivename, unsigned ms)
{
ei_socket_callbacks *cbs = ec->cbs;
void *ctx;
int rport = 0; /*uint16 rport = 0;*/
int sockd;
int dist = 0;
unsigned her_flags, her_version;
unsigned our_challenge, her_challenge;
unsigned char our_digest[16];
int err;
int pkt_sz;
struct sockaddr_in addr;
unsigned tmo = ms == 0 ? EI_SCLBK_INF_TMO : ms;
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, tmo)) < 0) {
EI_TRACE_ERR0("ei_xconnect","-> CONNECT can't get remote port");
/* ei_epmd_port_tmo() has set erl_errno */
return ERL_NO_PORT;
}
if (dist <= 4) {
EI_TRACE_ERR0("ei_xconnect","-> CONNECT remote version not compatible");
return ERL_ERROR;
}
err = ei_socket_ctx__(cbs, &ctx, ec->setup_context);
if (err) {
EI_TRACE_ERR2("ei_xconnect","-> SOCKET failed: %s (%d)",
estr(err), err);
erl_errno = err;
return ERL_CONNECT_FAIL;
}
memset((void *) &addr, 0, sizeof(struct sockaddr_in));
memcpy((void *) &addr.sin_addr, (void *) ip_addr, sizeof(addr.sin_addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(rport);
err = ei_connect_ctx_t__(cbs, ctx, (void *) &addr, sizeof(addr), tmo);
if (err) {
EI_TRACE_ERR2("ei_xconnect","-> CONNECT socket connect failed: %s (%d)",
estr(err), err);
abort_connection(cbs, ctx);
erl_errno = err;
return ERL_CONNECT_FAIL;
}
EI_TRACE_CONN0("ei_xconnect","-> CONNECT connected to remote");
err = EI_GET_FD__(cbs, ctx, &sockd);
if (err) {
EI_CONN_SAVE_ERRNO__(err);
goto error;
}
err = cbs->handshake_packet_header_size(ctx, &pkt_sz);
if (err) {
EI_CONN_SAVE_ERRNO__(err);
goto error;
}
if (send_name(cbs, ctx, pkt_sz, ec->thisnodename, (unsigned) dist, tmo))
goto error;
if (recv_status(cbs, ctx, pkt_sz, tmo))
goto error;
if (recv_challenge(cbs, ctx, pkt_sz, &her_challenge,
&her_version, &her_flags, NULL, tmo))
goto error;
our_challenge = gen_challenge();
gen_digest(her_challenge, ec->ei_connect_cookie, our_digest);
if (send_challenge_reply(cbs, ctx, pkt_sz, our_digest, our_challenge, tmo))
goto error;
if (recv_challenge_ack(cbs, ctx, pkt_sz, our_challenge,
ec->ei_connect_cookie, tmo))
goto error;
if (put_ei_socket_info(sockd, dist, null_cookie, ec, cbs, ctx) != 0)
goto error;
if (cbs->connect_handshake_complete) {
err = cbs->connect_handshake_complete(ctx);
if (err) {
EI_TRACE_ERR2("ei_xconnect","-> CONNECT failed: %s (%d)",
estr(err), err);
close_connection(cbs, ctx, sockd);
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
}
EI_TRACE_CONN1("ei_xconnect","-> CONNECT (ok) remote = %s",alivename);
erl_errno = 0;
return sockd;
error:
EI_TRACE_ERR0("ei_xconnect","-> CONNECT failed");
abort_connection(cbs, ctx);
return ERL_ERROR;
} /* ei_xconnect */
int ei_xconnect(ei_cnode* ec, Erl_IpAddr ip_addr, char *alivename)
{
return ei_xconnect_tmo(ec, ip_addr, alivename, 0);
}
int ei_listen(ei_cnode *ec, int *port, int backlog)
{
struct in_addr ip_addr;
ip_addr.s_addr = htonl(INADDR_ANY);
return ei_xlisten(ec, &ip_addr, port, backlog);
}
int ei_xlisten(ei_cnode *ec, struct in_addr *ip_addr, int *port, int backlog)
{
ei_socket_callbacks *cbs = ec->cbs;
struct sockaddr_in sock_addr;
void *ctx;
int fd, err, len;
err = ei_socket_ctx__(cbs, &ctx, ec->setup_context);
if (err) {
EI_TRACE_ERR2("ei_xlisten","-> SOCKET failed: %s (%d)",
estr(err), err);
erl_errno = err;
return ERL_ERROR;
}
memset((void *) &sock_addr, 0, sizeof(struct sockaddr_in));
memcpy((void *) &sock_addr.sin_addr, (void *) ip_addr, sizeof(*ip_addr));
sock_addr.sin_family = AF_INET;
sock_addr.sin_port = htons((short) *port);
len = sizeof(sock_addr);
err = ei_listen_ctx__(cbs, ctx, (void *) &sock_addr, &len, backlog);
if (err) {
EI_TRACE_ERR2("ei_xlisten","-> listen failed: %s (%d)",
estr(err), err);
erl_errno = err;
goto error;
}
if (len != sizeof(sock_addr)) {
if (len < offsetof(struct sockaddr_in, sin_addr) + sizeof(sock_addr.sin_addr)
|| len < offsetof(struct sockaddr_in, sin_port) + sizeof(sock_addr.sin_port)) {
erl_errno = EIO;
EI_TRACE_ERR0("ei_xlisten","-> get info failed");
goto error;
}
}
memcpy((void *) ip_addr, (void *) &sock_addr.sin_addr, sizeof(*ip_addr));
*port = (int) ntohs(sock_addr.sin_port);
err = EI_GET_FD__(cbs, ctx, &fd);
if (err) {
erl_errno = err;
goto error;
}
if (put_ei_socket_info(fd, 0, null_cookie, ec, cbs, ctx) != 0) {
EI_TRACE_ERR0("ei_xlisten","-> save socket info failed");
erl_errno = EIO;
goto error;
}
erl_errno = 0;
return fd;
error:
abort_connection(cbs, ctx);
return ERL_ERROR;
}
static int close_connection(ei_socket_callbacks *cbs, void *ctx, int fd)
{
int err;
remove_ei_socket_info(fd);
err = ei_close_ctx__(cbs, ctx);
if (err) {
erl_errno = err;
return ERL_ERROR;
}
return 0;
}
int ei_close_connection(int fd)
{
ei_socket_callbacks *cbs;
void *ctx;
int err = EI_GET_CBS_CTX__(&cbs, &ctx, fd);
if (err)
erl_errno = err;
else {
if (close_connection(cbs, ctx, fd) == 0)
return 0;
}
EI_TRACE_ERR2("ei_close_connection","<- CLOSE socket close failed: %s (%d)",
estr(erl_errno), erl_errno);
return ERL_ERROR;
} /* ei_close_connection */
static void abort_connection(ei_socket_callbacks *cbs, void *ctx)
{
(void) ei_close_ctx__(cbs, ctx);
}
/*
* Accept and initiate a connection from another
* 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;
unsigned her_version, her_flags;
char tmp_nodename[MAXNODELEN+1];
char *her_name;
int pkt_sz, err;
struct sockaddr_in addr;
int addr_len = sizeof(struct sockaddr_in);
ei_socket_callbacks *cbs;
void *ctx;
unsigned tmo = ms == 0 ? EI_SCLBK_INF_TMO : ms;
erl_errno = EIO; /* Default error code */
err = EI_GET_CBS_CTX__(&cbs, &ctx, lfd);
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
EI_TRACE_CONN0("ei_accept","<- ACCEPT waiting for connection");
if (conp) {
her_name = &conp->nodename[0];
}
else {
her_name = &tmp_nodename[0];
}
/*
* ei_accept_ctx_t__() replaces the pointer to the listen context
* with a pointer to the accepted connection context on success.
*/
err = ei_accept_ctx_t__(cbs, &ctx, (void *) &addr, &addr_len, tmo);
if (err) {
EI_TRACE_ERR2("ei_accept","<- ACCEPT socket accept failed: %s (%d)",
estr(err), err);
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
err = EI_GET_FD__(cbs, ctx, &fd);
if (err) {
EI_TRACE_ERR2("ei_accept","<- ACCEPT get fd failed: %s (%d)",
estr(err), err);
EI_CONN_SAVE_ERRNO__(err);
}
if (addr_len != sizeof(struct sockaddr_in)) {
if (addr_len < (offsetof(struct sockaddr_in, sin_addr)
+ sizeof(addr.sin_addr))) {
EI_TRACE_ERR0("ei_accept","<- ACCEPT get addr failed");
goto error;
}
}
err = cbs->handshake_packet_header_size(ctx, &pkt_sz);
if (err) {
EI_TRACE_ERR2("ei_accept","<- ACCEPT get packet size failed: %s (%d)",
estr(err), err);
EI_CONN_SAVE_ERRNO__(err);
}
EI_TRACE_CONN0("ei_accept","<- ACCEPT connected to remote");
if (recv_name(cbs, ctx, pkt_sz, &her_version, &her_flags, her_name, tmo)) {
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(cbs, ctx, pkt_sz, "ok", tmo))
goto error;
our_challenge = gen_challenge();
if (send_challenge(cbs, ctx, pkt_sz, ec->thisnodename,
our_challenge, her_version, tmo))
goto error;
if (recv_challenge_reply(cbs, ctx, pkt_sz, our_challenge,
ec->ei_connect_cookie, &her_challenge, tmo))
goto error;
gen_digest(her_challenge, ec->ei_connect_cookie, our_digest);
if (send_challenge_ack(cbs, ctx, pkt_sz, our_digest, tmo))
goto error;
if (put_ei_socket_info(fd, her_version, null_cookie, ec, cbs, ctx) != 0)
goto error;
}
if (conp) {
memcpy((void *) conp->ipadr, (void *) &addr.sin_addr, sizeof(conp->ipadr));
}
if (cbs->accept_handshake_complete) {
err = cbs->accept_handshake_complete(ctx);
if (err) {
EI_TRACE_ERR2("ei_xconnect","-> ACCEPT handshake failed: %s (%d)",
estr(err), err);
close_connection(cbs, ctx, fd);
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
}
EI_TRACE_CONN1("ei_accept","<- ACCEPT (ok) remote = %s",her_name);
erl_errno = 0; /* No error */
return fd;
error:
EI_TRACE_ERR0("ei_accept","<- ACCEPT failed");
abort_connection(cbs, ctx);
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)
{
ssize_t len;
unsigned char fourbyte[4]={0,0,0,0};
int err;
ei_socket_callbacks *cbs;
void *ctx;
unsigned tmo = ms == 0 ? EI_SCLBK_INF_TMO : ms;
err = EI_GET_CBS_CTX__(&cbs, &ctx, fd);
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
len = (ssize_t) 4;
err = ei_read_fill_ctx_t__(cbs, ctx, (char *) bufp, &len, tmo);
if (!err && len != (ssize_t) 4)
err = EIO;
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
/* Tick handling */
len = get_int32(bufp);
if (len == ERL_TICK) {
len = 4;
ei_write_fill_ctx_t__(cbs, ctx, (char *) fourbyte, &len, tmo);
/* FIXME ok to ignore error or timeout? */
erl_errno = EAGAIN;
return ERL_TICK;
}
if (len > bufsize) {
/* FIXME: We should drain the message. */
erl_errno = EMSGSIZE;
return ERL_ERROR;
}
else {
ssize_t need = len;
err = ei_read_fill_ctx_t__(cbs, ctx, (char *) bufp, &len, tmo);
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return ERL_ERROR;
}
if (len != need) {
erl_errno = EIO;
return ERL_ERROR;
}
}
return (int) 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 = msglen;
switch (msg->msgtype) { /* FIXME does not handle trace tokens and monitors */
case ERL_SEND:
case ERL_REG_SEND:
case ERL_LINK:
case ERL_UNLINK:
case ERL_GROUP_LEADER:
case ERL_EXIT:
case ERL_EXIT2:
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)
{
unsigned tmo = timeout < 0 ? EI_SCLBK_INF_TMO : (unsigned) timeout;
int res = ei_xreceive_msg_tmo(fd, msg, x, tmo);
if (res < 0 && erl_errno == ETIMEDOUT)
return ERL_TIMEOUT;
return res;
} /* 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];
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;
memset(&s, 0, sizeof(s));
gettimeofday(&s.tv, 0);
uname(&s.name);
s.cpu = clock();
s.pid = getpid();
#ifndef __ANDROID__
s.hid = gethostid();
#else
s.hid = 0;
#endif
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 < 16; ++i) {
*p++ = tab[(int)((*d) >> 4)];
*p++ = tab[(int)((*d++) & 0xF)];
}
*p = '\0';
return buff;
}
static int read_hs_package(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, char **buf, int *buflen,
int *is_static, unsigned ms)
{
unsigned char nbuf[4];
unsigned char *x = nbuf;
ssize_t len, need;
int err;
len = (ssize_t) pkt_sz;
err = ei_read_fill_ctx_t__(cbs, ctx, (char *)nbuf, &len, ms);
if (!err && len != (ssize_t) pkt_sz)
err = EIO;
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return -1;
}
switch (pkt_sz) {
case 2:
len = get16be(x);
break;
case 4:
len = get32be(x);
break;
default:
return -1;
}
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;
}
}
need = len;
err = ei_read_fill_ctx_t__(cbs, ctx, *buf, &len, ms);
if (!err && len != need)
err = EIO;
if (err) {
EI_CONN_SAVE_ERRNO__(err);
return -1;
}
return len;
}
static int send_status(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, char *status, unsigned ms)
{
char *buf, *s;
char dbuf[DEFBUF_SIZ];
int siz = strlen(status) + 1 + pkt_sz;
int err;
ssize_t len;
buf = (siz > DEFBUF_SIZ) ? malloc(siz) : dbuf;
if (!buf) {
erl_errno = ENOMEM;
return -1;
}
s = buf;
switch (pkt_sz) {
case 2:
put16be(s,siz - 2);
break;
case 4:
put32be(s,siz - 4);
break;
default:
return -1;
}
put8(s, 's');
memcpy(s, status, strlen(status));
len = (ssize_t) siz;
err = ei_write_fill_ctx_t__(cbs, ctx, buf, &len, ms);
if (!err && len != (ssize_t) siz)
err = EIO;
if (err) {
EI_TRACE_ERR2("send_status","-> SEND_STATUS socket write failed: %s (%d)",
estr(err), err);
if (buf != dbuf)
free(buf);
EI_CONN_SAVE_ERRNO__(err);
return -1;
}
EI_TRACE_CONN1("send_status","-> SEND_STATUS (%s)",status);
if (buf != dbuf)
free(buf);
return 0;
}
static int recv_status(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned ms)
{
char dbuf[DEFBUF_SIZ];
char *buf = dbuf;
int is_static = 1;
int buflen = DEFBUF_SIZ;
int rlen;
if ((rlen = read_hs_package(cbs, ctx, pkt_sz,
&buf, &buflen, &is_static, ms)) <= 0) {
EI_TRACE_ERR1("recv_status",
"<- RECV_STATUS socket read failed (%d)", rlen);
goto error;
}
EI_TRACE_CONN2("recv_status",
"<- RECV_STATUS (%.*s)", (rlen>20 ? 20 : rlen), buf);
if (rlen >= 3 && buf[0] == 's' && buf[1] == 'o' && buf[2] == 'k') {
/* Expecting "sok" or "sok_simultaneous" */
if (!is_static)
free(buf);
return 0;
}
error:
if (!is_static)
free(buf);
return -1;
}
static int send_name_or_challenge(ei_socket_callbacks *cbs,
void *ctx,
int pkt_sz,
char *nodename,
int f_chall,
unsigned challenge,
unsigned version,
unsigned ms)
{
char *buf;
unsigned char *s;
char dbuf[DEFBUF_SIZ];
int siz = pkt_sz + 1 + 2 + 4 + strlen(nodename);
const char* function[] = {"SEND_NAME", "SEND_CHALLENGE"};
int err;
ssize_t len;
if (f_chall)
siz += 4;
buf = (siz > DEFBUF_SIZ) ? malloc(siz) : dbuf;
if (!buf) {
erl_errno = ENOMEM;
return -1;
}
s = (unsigned char *)buf;
switch (pkt_sz) {
case 2:
put16be(s,siz - 2);
break;
case 4:
put32be(s,siz - 4);
break;
default:
return -1;
}
put8(s, 'n');
put16be(s, version);
put32be(s, (DFLAG_EXTENDED_REFERENCES
| DFLAG_DIST_MONITOR
| DFLAG_EXTENDED_PIDS_PORTS
| DFLAG_FUN_TAGS
| DFLAG_NEW_FUN_TAGS
| DFLAG_NEW_FLOATS
| DFLAG_SMALL_ATOM_TAGS
| DFLAG_UTF8_ATOMS
| DFLAG_MAP_TAG
| DFLAG_BIG_CREATION));
if (f_chall)
put32be(s, challenge);
memcpy(s, nodename, strlen(nodename));
len = (ssize_t) siz;
err = ei_write_fill_ctx_t__(cbs, ctx, buf, &len, ms);
if (!err && len != (ssize_t) siz)
err = EIO;
if (err) {
EI_TRACE_ERR1("send_name_or_challenge",
"-> %s socket write failed", function[f_chall]);
if (buf != dbuf)
free(buf);
EI_CONN_SAVE_ERRNO__(err);
return -1;
}
if (buf != dbuf)
free(buf);
return 0;
}
static int recv_challenge(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned *challenge, unsigned *version,
unsigned *flags, char *namebuf, unsigned ms)
{
char dbuf[DEFBUF_SIZ];
char *buf = dbuf;
int is_static = 1;
int buflen = DEFBUF_SIZ;
int rlen;
char *s;
char tag;
char tmp_nodename[MAXNODELEN+1];
erl_errno = EIO; /* Default */
if ((rlen = read_hs_package(cbs, ctx, pkt_sz, &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 (!(*flags & DFLAG_NEW_FLOATS)) {
EI_TRACE_ERR0("recv_challenge","<- RECV_CHALLENGE peer cannot "
"handle binary float encoding");
goto error;
}
if (!namebuf)
namebuf = &tmp_nodename[0];
memcpy(namebuf, s, rlen - 11);
namebuf[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,
*version,
*flags,
*challenge
);
erl_errno = 0;
return 0;
error:
if (!is_static)
free(buf);
return -1;
}
static int send_challenge_reply(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned char digest[16],
unsigned challenge, unsigned ms)
{
char *s;
char buf[DEFBUF_SIZ];
int siz = pkt_sz + 1 + 4 + 16;
int err;
ssize_t len;
s = buf;
switch (pkt_sz) {
case 2:
put16be(s,siz - 2);
break;
case 4:
put32be(s,siz - 4);
break;
default:
return -1;
}
put8(s, 'r');
put32be(s, challenge);
memcpy(s, digest, 16);
len = (ssize_t) siz;
err = ei_write_fill_ctx_t__(cbs, ctx, buf, &len, ms);
if (!err && len != (ssize_t) siz)
err = EIO;
if (err) {
EI_TRACE_ERR2("send_challenge_reply",
"-> SEND_CHALLENGE_REPLY socket write failed: %s (%d)",
estr(err), err);
EI_CONN_SAVE_ERRNO__(err);
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(ei_socket_callbacks *cbs,
void *ctx,
int pkt_sz,
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_hs_package(cbs, ctx, pkt_sz, &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(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
unsigned char digest[16], unsigned ms)
{
char *s;
char buf[DEFBUF_SIZ];
int siz = pkt_sz + 1 + 16;
int err;
ssize_t len;
s = buf;
switch (pkt_sz) {
case 2:
put16be(s,siz - 2);
break;
case 4:
put32be(s,siz - 4);
break;
default:
return -1;
}
put8(s, 'a');
memcpy(s, digest, 16);
len = (ssize_t) siz;
err = ei_write_fill_ctx_t__(cbs, ctx, buf, &len, ms);
if (!err && len != (ssize_t) siz)
err = EIO;
if (err) {
EI_TRACE_ERR2("recv_challenge_reply",
"-> SEND_CHALLENGE_ACK socket write failed: %s (%d)",
estr(err), err);
EI_CONN_SAVE_ERRNO__(err);
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(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, 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_hs_package(cbs, ctx, pkt_sz, &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(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
char *nodename, unsigned version, unsigned ms)
{
return send_name_or_challenge(cbs, ctx, pkt_sz, nodename, 0,
0, version, ms);
}
static int send_challenge(ei_socket_callbacks *cbs, void *ctx, int pkt_sz,
char *nodename, unsigned challenge, unsigned version,
unsigned ms)
{
return send_name_or_challenge(cbs, ctx, pkt_sz, nodename, 1,
challenge, version, ms);
}
static int recv_name(ei_socket_callbacks *cbs, void *ctx,
int pkt_sz, unsigned *version,
unsigned *flags, char *namebuf, unsigned ms)
{
char dbuf[DEFBUF_SIZ];
char *buf = dbuf;
int is_static = 1;
int buflen = DEFBUF_SIZ;
int rlen;
char *s;
char tmp_nodename[MAXNODELEN+1];
char tag;
erl_errno = EIO; /* Default */
if ((rlen = read_hs_package(cbs, ctx, pkt_sz, &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 (!namebuf)
namebuf = &tmp_nodename[0];
memcpy(namebuf, s, rlen - 7);
namebuf[rlen - 7] = '\0';
if (!is_static)
free(buf);
EI_TRACE_CONN3("recv_name",
"<- RECV_NAME (ok) node = %s, version = %u, flags = %u",
namebuf,*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)
{
#ifdef __WIN32__
char* homedrive = getenv("HOMEDRIVE");
char* homepath = getenv("HOMEPATH");
if (homedrive && homepath) {
if (strlen(homedrive)+strlen(homepath) >= size)
return 0;
strcpy(buf, homedrive);
strcat(buf, homepath);
return 1;
}
else {
int len = GetWindowsDirectory(buf, size);
if (len) {
return (len < size);
}
}
#else
char* homepath = getenv("HOME");
if (homepath) {
if (strlen(homepath) >= size)
return 0;
strcpy(buf, homepath);
return 1;
}
#endif
buf[0] = '.';
buf[1] = '\0';
return 1;
}
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! */
}
|