/* * %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 #include #include #ifdef __WIN32__ #include #include #include #elif VXWORKS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define getpid() taskIdSelf() #else /* some other unix */ #include #include #if TIME_WITH_SYS_TIME # include # include #else # if HAVE_SYS_TIME_H # include # else # include # endif #endif #include #include #include #include #include #include /* for gen_challenge (NEED FIX?) */ #include #endif /* common includes */ #include #include #include #include #include #include #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" static int ei_connect_initialized = 0; 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(int late) { 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 EIO; 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 ENOMEM; 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(int late) { #ifdef _REENTRANT if (late) return ENOTSUP; /* Refuse doing unsafe initialization... */ ei_sockets_lock = ei_mutex_create(); if (!ei_sockets_lock) return ENOMEM; #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 static int init_connect(int late) { int error; /* * 'late' is non-zero when not called via ei_init(). Such a * call is not supported, but we for now save the day if * it easy to do so; otherwise, return ENOTSUP. */ #ifdef __WIN32__ if (!initWinSock()) { EI_TRACE_ERR0("ei_init_connect","can't initiate winsock"); return EIO; } #endif /* win32 */ error = init_socket_info(late); if (error) { EI_TRACE_ERR0("ei_init_connect","can't initiate socket info"); return error; } ei_connect_initialized = !0; return 0; } int ei_init_connect(void) { return init_connect(0); } /* * 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 (!ei_connect_initialized) init_connect(!0); if (cbs != &ei_default_socket_callbacks) EI_SET_HAVE_PLUGIN_SOCKET_IMPL__; 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; 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; 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; if (!ei_connect_initialized) init_connect(!0); /* 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'; } else { /* We use a short node name */ if ((ct = strchr(hp->h_name, '.')) != NULL) *ct = '\0'; strcpy(thishostname, hp->h_name); } } if (strlen(this_node_name) + 1 + strlen(thishostname) > MAXNODELEN) { EI_TRACE_ERR0("ei_connect_init_ussi","this node name is too long"); return ERL_ERROR; } sprintf(thisnodename, "%s@%s", this_node_name, thishostname); 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; if (strlen(nodename) > MAXNODELEN) { EI_TRACE_ERR0("ei_connect","Too long nodename"); return ERL_ERROR; } /* 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; unsigned int flags; 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); flags = (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 | DFLAG_EXPORT_PTR_TAG | DFLAG_BIT_BINARIES); if (ei_internal_use_21_bitstr_expfun()) { flags &= ~(DFLAG_EXPORT_PTR_TAG | DFLAG_BIT_BINARIES); } put32be(s, flags); 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_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_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," get_cookie: too long path to home"); return 0; } strcat(fname, COOKIE_FILE); if ((fd = open(fname, O_RDONLY, 0777)) < 0) { fprintf(stderr," get_cookie: can't open cookie file"); return 0; } if ((len = read(fd, buf, bufsize-1)) < 0) { fprintf(stderr," 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," 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! */ }