--- gvpe/src/connection.C 2003/10/16 02:41:21 1.22 +++ gvpe/src/connection.C 2005/04/19 03:22:46 1.54 @@ -1,8 +1,10 @@ /* connection.C -- manage a single connection - Copyright (C) 2003 Marc Lehmann + Copyright (C) 2003-2005 Marc Lehmann - This program is free software; you can redistribute it and/or modify + This file is part of GVPE. + + GVPE is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. @@ -13,15 +15,13 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software + along with gvpe; if not, write to the Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "config.h" -extern "C" { -# include "lzf/lzf.h" -} +#include #include @@ -30,8 +30,6 @@ #include #include -#include "gettext.h" - #include "conf.h" #include "slog.h" #include "device.h" @@ -46,6 +44,12 @@ #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic +#define ULTRA_FAST 1 +#define HLOG 15 +#include "lzf/lzf.h" +#include "lzf/lzf_c.c" +#include "lzf/lzf_d.c" + struct crypto_ctx { EVP_CIPHER_CTX cctx; @@ -58,14 +62,14 @@ crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) { EVP_CIPHER_CTX_init (&cctx); - EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); + require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); HMAC_CTX_init (&hctx); HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); } crypto_ctx::~crypto_ctx () { - EVP_CIPHER_CTX_cleanup (&cctx); + require (EVP_CIPHER_CTX_cleanup (&cctx)); HMAC_CTX_cleanup (&hctx); } @@ -75,10 +79,10 @@ EVP_MD_CTX ctx; EVP_MD_CTX_init (&ctx); - EVP_DigestInit (&ctx, RSA_HASH); - EVP_DigestUpdate(&ctx, &chg, sizeof chg); - EVP_DigestUpdate(&ctx, &id, sizeof id); - EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); + require (EVP_DigestInit (&ctx, RSA_HASH)); + require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); + require (EVP_DigestUpdate(&ctx, &id, sizeof id)); + require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); EVP_MD_CTX_cleanup (&ctx); } @@ -93,54 +97,52 @@ void cleaner_cb (time_watcher &w); time_watcher cleaner; bool find (const rsaid &id, rsachallenge &chg) - { - for (iterator i = begin (); i != end (); ++i) - { - if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) - { - memcpy (&chg, &i->chg, sizeof chg); + { + for (iterator i = begin (); i != end (); ++i) + { + if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) + { + memcpy (&chg, &i->chg, sizeof chg); - erase (i); - return true; - } - } + erase (i); + return true; + } + } - if (cleaner.at < NOW) - cleaner.start (NOW + RSA_TTL); + if (cleaner.at < NOW) + cleaner.start (NOW + RSA_TTL); - return false; - } + return false; + } void gen (rsaid &id, rsachallenge &chg) - { - rsa_entry e; + { + rsa_entry e; - RAND_bytes ((unsigned char *)&id, sizeof id); - RAND_bytes ((unsigned char *)&chg, sizeof chg); + RAND_bytes ((unsigned char *)&id, sizeof id); + RAND_bytes ((unsigned char *)&chg, sizeof chg); - e.expire = NOW + RSA_TTL; - e.id = id; - memcpy (&e.chg, &chg, sizeof chg); + e.expire = NOW + RSA_TTL; + e.id = id; + memcpy (&e.chg, &chg, sizeof chg); - push_back (e); + push_back (e); - if (cleaner.at < NOW) - cleaner.start (NOW + RSA_TTL); - } + if (cleaner.at < NOW) + cleaner.start (NOW + RSA_TTL); + } rsa_cache () - : cleaner (this, &rsa_cache::cleaner_cb) - { } + : cleaner (this, &rsa_cache::cleaner_cb) + { } } rsa_cache; void rsa_cache::cleaner_cb (time_watcher &w) { - if (empty ()) - w.at = TSTAMP_CANCEL; - else + if (!empty ()) { - w.at = NOW + RSA_TTL; + w.start (NOW + RSA_TTL); for (iterator i = begin (); i != end (); ) if (i->expire <= NOW) @@ -202,10 +204,10 @@ // but low on resources. struct net_rate_limiter : list { - static const double ALPHA = 1. - 1. / 600.; // allow bursts - static const double CUTOFF = 10.; // one event every CUTOFF seconds - static const double EXPIRE = CUTOFF * 30.; // expire entries after this time - static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value +# define NRL_ALPHA (1. - 1. / 600.) // allow bursts +# define NRL_CUTOFF 10. // one event every CUTOFF seconds +# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time +# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value bool can (const sockinfo &si) { return can((u32)si.host); } bool can (u32 host); @@ -220,7 +222,7 @@ for (i = begin (); i != end (); ) if (i->host == host) break; - else if (i->last < NOW - EXPIRE) + else if (i->last < NOW - NRL_EXPIRE) i = erase (i); else i++; @@ -231,7 +233,7 @@ ri.host = host; ri.pcnt = 1.; - ri.diff = MAXDIF; + ri.diff = NRL_MAXDIF; ri.last = NOW; push_front (ri); @@ -243,19 +245,19 @@ net_rateinfo ri (*i); erase (i); - ri.pcnt = ri.pcnt * ALPHA; - ri.diff = ri.diff * ALPHA + (NOW - ri.last); + ri.pcnt = ri.pcnt * NRL_ALPHA; + ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); ri.last = NOW; double dif = ri.diff / ri.pcnt; - bool send = dif > CUTOFF; + bool send = dif > NRL_CUTOFF; - if (dif > MAXDIF) + if (dif > NRL_MAXDIF) { ri.pcnt = 1.; - ri.diff = MAXDIF; + ri.diff = NRL_MAXDIF; } else if (send) ri.pcnt++; @@ -312,7 +314,7 @@ #define MAXVPNDATA (MAX_MTU - 6 - 6) #define DATAHDR (sizeof (u32) + RAND_SIZE) -struct vpndata_packet:vpn_packet +struct vpndata_packet : vpn_packet { u8 data[MAXVPNDATA + DATAHDR]; // seqno @@ -335,21 +337,24 @@ #if ENABLE_COMPRESSION u8 cdata[MAX_MTU]; - u32 cl; - cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); - if (cl) + if (conn->features & ENABLE_COMPRESSION) { - type = PT_DATA_COMPRESSED; - d = cdata; - l = cl + 2; + u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); + + if (cl) + { + type = PT_DATA_COMPRESSED; + d = cdata; + l = cl + 2; - d[0] = cl >> 8; - d[1] = cl; + d[0] = cl >> 8; + d[1] = cl; + } } #endif - EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); + require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); struct { #if RAND_SIZE @@ -363,17 +368,17 @@ RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); #endif - EVP_EncryptUpdate (cctx, + require (EVP_EncryptUpdate (cctx, (unsigned char *) data + outl, &outl2, - (unsigned char *) &datahdr, DATAHDR); + (unsigned char *) &datahdr, DATAHDR)); outl += outl2; - EVP_EncryptUpdate (cctx, + require (EVP_EncryptUpdate (cctx, (unsigned char *) data + outl, &outl2, - (unsigned char *) d, l); + (unsigned char *) d, l)); outl += outl2; - EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); + require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); outl += outl2; len = outl + data_hdr_size (); @@ -392,7 +397,7 @@ u8 *d; u32 l = len - data_hdr_size (); - EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); + require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); #if ENABLE_COMPRESSION u8 cdata[MAX_MTU]; @@ -404,12 +409,12 @@ d = &(*p)[6 + 6 - DATAHDR]; /* this overwrites part of the src mac, but we fix that later */ - EVP_DecryptUpdate (cctx, + require (EVP_DecryptUpdate (cctx, d, &outl2, - (unsigned char *)&data, len - data_hdr_size ()); + (unsigned char *)&data, len - data_hdr_size ())); outl += outl2; - EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); + require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); outl += outl2; seqno = ntohl (*(u32 *)(d + RAND_SIZE)); @@ -448,17 +453,23 @@ // field comes before this data, so peers with other // hmacs simply will not work. u8 prot_major, prot_minor, randsize, hmaclen; - u8 flags, challengelen, pad2, pad3; + u8 flags, challengelen, features, pad3; u32 cipher_nid, digest_nid, hmac_nid; - const u8 curflags () const - { - return 0x80 - | (ENABLE_COMPRESSION ? 0x01 : 0x00); - } - void setup (ptype type, int dst); bool chk_config () const; + + static u8 get_features () + { + u8 f = 0; +#if ENABLE_COMPRESSION + f |= FEATURE_COMPRESSION; +#endif +#if ENABLE_ROHC + f |= FEATURE_ROHC; +#endif + return f; + } }; void config_packet::setup (ptype type, int dst) @@ -467,8 +478,9 @@ prot_minor = PROTOCOL_MINOR; randsize = RAND_SIZE; hmaclen = HMACLENGTH; - flags = curflags (); + flags = 0; challengelen = sizeof (rsachallenge); + features = get_features (); cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); digest_nid = htonl (EVP_MD_type (RSA_HASH)); @@ -481,21 +493,19 @@ bool config_packet::chk_config () const { if (prot_major != PROTOCOL_MAJOR) - slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); + slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); else if (randsize != RAND_SIZE) - slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); + slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); else if (hmaclen != HMACLENGTH) - slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); - else if (flags != curflags ()) - slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); + slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); else if (challengelen != sizeof (rsachallenge)) - slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); + slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) - slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); + slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) - slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); + slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) - slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); + slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); else return true; @@ -506,7 +516,7 @@ { char magic[8]; u8 initiate; // false if this is just an automatic reply - u8 protocols; // supported protocols (will get patches on forward) + u8 protocols; // supported protocols (will be patched on forward) u8 pad2, pad3; rsaid id; rsaencrdata encr; @@ -577,7 +587,9 @@ { connectmode = conf->connectmode; - rekey.start (NOW + ::conf.rekey); + // make sure rekeying timeouts are slightly asymmetric + rekey.start (NOW + ::conf.rekey + + (conf->id > THISNODE->id ? 10 : 0)); keepalive.start (NOW + ::conf.keepalive); // send queued packets @@ -600,8 +612,8 @@ { retry_cnt = 0; establish_connection.start (NOW + 5); - keepalive.reset (); - rekey.reset (); + keepalive.stop (); + rekey.stop (); } } @@ -613,6 +625,7 @@ // mask out protocols we cannot establish if (!conf->udp_port) protocol &= ~PROT_UDPv4; if (!conf->tcp_port) protocol &= ~PROT_TCPv4; + if (!conf->dns_port) protocol &= ~PROT_DNSv4; si.set (conf, protocol); } @@ -627,8 +640,8 @@ if (r) { - slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), - conf->nodename, r->conf->nodename); + slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), + conf->nodename, r->conf->nodename, (const char *)r->si); return r->si; } else @@ -677,13 +690,8 @@ auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); rsachallenge chg; - rsa_cache.gen (pkt->id, chg); - - if (0 > RSA_public_encrypt (sizeof chg, - (unsigned char *)&chg, (unsigned char *)&pkt->encr, - conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) - fatal ("RSA_public_encrypt error"); + rsa_encrypt (conf->rsa_key, chg, pkt->encr); slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); @@ -727,27 +735,30 @@ void connection::establish_connection_cb (time_watcher &w) { - if (ictx || conf == THISNODE - || connectmode == conf_node::C_NEVER - || connectmode == conf_node::C_DISABLED) - w.at = TSTAMP_CANCEL; - else if (w.at <= NOW) - { - double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; - - if (retry_int < 3600 * 8) - retry_cnt++; - - w.at = NOW + retry_int; + if (!ictx + && conf != THISNODE + && connectmode != conf_node::C_NEVER + && connectmode != conf_node::C_DISABLED + && NOW > w.at) + { + w.at = TSTAMP_MAX; // first disable this watcher in case of recursion + + double retry_int = double (retry_cnt & 3 + ? (retry_cnt & 3) + 1 + : 1 << (retry_cnt >> 2)); reset_si (); + bool slow = si.prot & PROT_SLOW; + if (si.prot && !si.host) vpn->send_connect_request (conf->id); else { const sockinfo &dsi = forward_si (si); + slow = slow || (dsi.prot & PROT_SLOW); + if (dsi.valid () && auth_rate_limiter.can (dsi)) { if (retry_cnt < 4) @@ -756,6 +767,15 @@ send_ping (dsi, 0); } } + + retry_int *= slow ? 8. : 0.7; + + if (retry_int < conf->max_retry) + retry_cnt++; + else + retry_int = conf->max_retry; + + w.start (NOW + retry_int); } } @@ -768,20 +788,24 @@ conf->nodename, (const char *)si); if (::conf.script_node_down) - run_script (run_script_cb (this, &connection::script_node_down), false); + if (!run_script (run_script_cb (this, &connection::script_node_down), false)) + slog (L_WARN, _("node-down command execution failed, continuing.")); } delete ictx; ictx = 0; delete octx; octx = 0; +#if ENABLE_DNS + dnsv4_reset_connection (); +#endif - si.host= 0; + si.host = 0; last_activity = 0; retry_cnt = 0; - rekey.reset (); - keepalive.reset (); - establish_connection.reset (); + rekey.stop (); + keepalive.stop (); + establish_connection.stop (); } void @@ -796,8 +820,6 @@ void connection::rekey_cb (time_watcher &w) { - w.at = TSTAMP_CANCEL; - reset_connection (); establish_connection (); } @@ -841,7 +863,7 @@ send_vpn_packet (pkt, si, tos); else { - vpn_queue.put (new vpn_packet (*pkt)); + vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); establish_connection (); } @@ -910,11 +932,12 @@ rsachallenge k; - if (0 > RSA_private_decrypt (sizeof (p->encr), - (unsigned char *)&p->encr, (unsigned char *)&k, - ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) - slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), - conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); + if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) + { + slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), + conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); + break; + } else { delete octx; @@ -923,6 +946,7 @@ oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; conf->protocols = p->protocols; + features = p->features & config_packet::get_features (); send_auth_response (rsi, p->id, k); @@ -968,7 +992,7 @@ if (!p->hmac_chk (cctx)) { slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" - "could be an attack, or just corruption or an synchronization error"), + "could be an attack, or just corruption or a synchronization error"), conf->nodename, (const char *)rsi); break; } @@ -996,7 +1020,8 @@ p->prot_major, p->prot_minor); if (::conf.script_node_up) - run_script (run_script_cb (this, &connection::script_node_up), false); + if (!run_script (run_script_cb (this, &connection::script_node_up), false)) + slog (L_WARN, _("node-up command execution failed, continuing.")); break; } @@ -1027,7 +1052,7 @@ if (!p->hmac_chk (ictx)) slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" - "could be an attack, or just corruption or an synchronization error"), + "could be an attack, or just corruption or a synchronization error"), conf->nodename, (const char *)rsi); else { @@ -1046,11 +1071,10 @@ slog (L_INFO, _("%s(%s): socket address changed to %s"), conf->nodename, (const char *)si, (const char *)rsi); } - - delete d; - - break; } + + delete d; + break; } } @@ -1085,23 +1109,24 @@ case vpn_packet::PT_CONNECT_INFO: if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) { - connect_info_packet *p = (connect_info_packet *) pkt; - - assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything + connect_info_packet *p = (connect_info_packet *)pkt; - connection *c = vpn->conns[p->id - 1]; + if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything + { + connection *c = vpn->conns[p->id - 1]; - c->conf->protocols = p->protocols; - protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); - p->si.upgrade_protocol (protocol, c->conf); + c->conf->protocols = p->protocols; + protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); + p->si.upgrade_protocol (protocol, c->conf); - slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", - conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); + slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", + conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); - const sockinfo &dsi = forward_si (p->si); + const sockinfo &dsi = forward_si (p->si); - if (dsi.valid ()) - c->send_auth_request (dsi, true); + if (dsi.valid ()) + c->send_auth_request (dsi, true); + } } break; @@ -1120,17 +1145,17 @@ establish_connection (); } else if (NOW < last_activity + ::conf.keepalive) - w.at = last_activity + ::conf.keepalive; + w.start (last_activity + ::conf.keepalive); else if (conf->connectmode != conf_node::C_ONDEMAND || THISNODE->connectmode != conf_node::C_ONDEMAND) { send_ping (si); - w.at = NOW + 5; + w.start (NOW + 5); } else if (NOW < last_activity + ::conf.keepalive + 10) // hold ondemand connections implicitly a few seconds longer // should delete octx, though, or something like that ;) - w.at = last_activity + ::conf.keepalive + 10; + w.start (last_activity + ::conf.keepalive + 10); else reset_connection (); } @@ -1146,9 +1171,19 @@ delete p; } -void connection::script_node () +void connection::script_init_env (const char *ext) { - vpn->script_if_up (); + char *env; + asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); + asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); + asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, + 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, + conf->id & 0xff); putenv (env); +} + +void connection::script_init_connect_env () +{ + vpn->script_init_env (); char *env; asprintf (&env, "DESTID=%d", conf->id); putenv (env); @@ -1159,31 +1194,49 @@ const char *connection::script_node_up () { - script_node (); + script_init_connect_env (); putenv ("STATE=up"); - return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; + char *filename; + asprintf (&filename, + "%s/%s", + confbase, + ::conf.script_node_up ? ::conf.script_node_up : "node-up"); + + return filename; } const char *connection::script_node_down () { - script_node (); + script_init_connect_env (); putenv ("STATE=down"); - return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; + char *filename; + asprintf (&filename, + "%s/%s", + confbase, + ::conf.script_node_down ? ::conf.script_node_down : "node-down"); + + return filename; } -connection::connection(struct vpn *vpn_) -: vpn(vpn_) +connection::connection (struct vpn *vpn, conf_node *conf) +: vpn(vpn), conf(conf) , rekey (this, &connection::rekey_cb) , keepalive (this, &connection::keepalive_cb) , establish_connection (this, &connection::establish_connection_cb) +#if ENABLE_DNS +, dns (0) +#endif { octx = ictx = 0; retry_cnt = 0; + if (!conf->protocols) // make sure some protocol is enabled + conf->protocols = PROT_UDPv4; + connectmode = conf_node::C_ALWAYS; // initial setting reset_connection (); }