Annotation of libaitmqtt/src/conn.c, revision 1.1
1.1 ! misho 1: /*************************************************************************
! 2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
! 3: * by Michael Pounov <misho@openbsd-bg.org>
! 4: *
! 5: * $Author: misho $
! 6: * $Id: aitsched.c,v 1.5 2012/01/24 21:59:47 misho Exp $
! 7: *
! 8: **************************************************************************
! 9: The ELWIX and AITNET software is distributed under the following
! 10: terms:
! 11:
! 12: All of the documentation and software included in the ELWIX and AITNET
! 13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
! 14:
! 15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
! 16: by Michael Pounov <misho@elwix.org>. All rights reserved.
! 17:
! 18: Redistribution and use in source and binary forms, with or without
! 19: modification, are permitted provided that the following conditions
! 20: are met:
! 21: 1. Redistributions of source code must retain the above copyright
! 22: notice, this list of conditions and the following disclaimer.
! 23: 2. Redistributions in binary form must reproduce the above copyright
! 24: notice, this list of conditions and the following disclaimer in the
! 25: documentation and/or other materials provided with the distribution.
! 26: 3. All advertising materials mentioning features or use of this software
! 27: must display the following acknowledgement:
! 28: This product includes software developed by Michael Pounov <misho@elwix.org>
! 29: ELWIX - Embedded LightWeight unIX and its contributors.
! 30: 4. Neither the name of AITNET nor the names of its contributors
! 31: may be used to endorse or promote products derived from this software
! 32: without specific prior written permission.
! 33:
! 34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
! 35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 44: SUCH DAMAGE.
! 45: */
! 46: #include "global.h"
! 47:
! 48:
! 49: /* ------------------------------------------------------------------- */
! 50:
! 51: /*
! 52: * mqtt_msgCONNECT() Create CONNECT message
! 53: *
! 54: * @buf = Message buffer
! 55: * @csConnID = ConnectID
! 56: * @kasec = Keep alive timeout
! 57: * @csUser = Username if !=NULL
! 58: * @csPass = Password for Username, only if csUser is set
! 59: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
! 60: * @csWillMessage = Will Message, may be NULL
! 61: * @ClrSess = Clear Session subscriptions after disconnect
! 62: * @WillQOS = Will QOS if csWillTopic is set
! 63: * @WillRetain = Will Retain Will Message if csWillTopic is set
! 64: * return: -1 error or >-1 message size for send
! 65: */
! 66: int
! 67: mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
! 68: u_short kasec, const char *csUser, const char *csPass,
! 69: const char *csWillTopic, const char *csWillMessage,
! 70: u_char ClrSess, u_char WillQOS, u_char WillRetain)
! 71: {
! 72: int siz = 0;
! 73: struct mqtthdr *hdr;
! 74: mqtthdr_var_t *var, *cid, *topic, *wmsg, *user, *pass;
! 75: mqtthdr_protover_t *proto;
! 76: mqtthdr_connflgs_t *flags;
! 77: mqtt_len_t *ka;
! 78:
! 79: if (!buf || !csConnID)
! 80: return -1;
! 81: if (strlen(csConnID) > 23) {
! 82: mqtt_SetErr(EINVAL, "Error:: invalid argument ConnID is too long (max 23 bytes)");
! 83: return -1;
! 84: }
! 85: if (csUser && strlen(csUser) > 12) {
! 86: mqtt_SetErr(EINVAL, "Error:: invalid argument Username is too long (max 12 bytes)");
! 87: return -1;
! 88: }
! 89: if (csPass && strlen(csPass) > 12) {
! 90: mqtt_SetErr(EINVAL, "Error:: invalid argument Password is too long (max 12 bytes)");
! 91: return -1;
! 92: }
! 93: if (WillQOS > MQTT_QOS_EXACTLY) {
! 94: mqtt_SetErr(EINVAL, "Error:: invalid argument WillQOS - unknown QOS value");
! 95: return -1;
! 96: }
! 97:
! 98: if (mqtt_msgRealloc(buf, BUFSIZ) == -1)
! 99: return -1;
! 100: else {
! 101: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 102: siz += sizeof(struct mqtthdr);
! 103: var = (mqtthdr_var_t*) (buf->msg_base + siz);
! 104: siz += 8;
! 105: proto = buf->msg_base + siz;
! 106: siz++;
! 107: flags = (mqtthdr_connflgs_t*) (buf->msg_base + siz);
! 108: siz++;
! 109: ka = (mqtt_len_t*) (buf->msg_base + siz);
! 110: siz += sizeof(mqtt_len_t);
! 111: }
! 112:
! 113: /* fixed header */
! 114: MQTTHDR_MSGINIT(hdr);
! 115: hdr->mqtt_msg.type = MQTT_TYPE_CONNECT;
! 116: *hdr->mqtt_len = 0;
! 117:
! 118: /* variable header */
! 119: var->var_sb.sb.l = 6;
! 120: memcpy(var->var_data, MQTT_CONN_STR, 6);
! 121:
! 122: *proto = MQTT_PROTO_VER;
! 123:
! 124: /* CONNECT header */
! 125: flags->clean_sess = ClrSess ? 1 : 0;
! 126: if (csUser && *csUser) {
! 127: flags->username = 1;
! 128: flags->password = csPass ? 1 : 0;
! 129: } else {
! 130: flags->username = 0;
! 131: flags->password = 0;
! 132: }
! 133: if (csWillTopic && *csWillTopic) {
! 134: flags->will_flg = 1;
! 135: flags->will_qos = WillQOS;
! 136: flags->will_retain = WillRetain ? 1 : 0;
! 137: } else {
! 138: flags->will_flg = 0;
! 139: flags->will_qos = 0;
! 140: flags->will_retain = 0;
! 141: }
! 142:
! 143: ka->val = kasec ? htons(kasec) : htons(MQTT_KEEPALIVE);
! 144:
! 145: /* ConnID */
! 146: cid = (mqtthdr_var_t*) (buf->msg_base + siz);
! 147: cid->var_sb.val = htons(strlen(csConnID));
! 148: siz += MQTTHDR_VAR_SIZEOF(cid);
! 149: memcpy(cid->var_data, csConnID, ntohs(cid->var_sb.val));
! 150:
! 151: /* If Will Flags setup */
! 152: if (csWillTopic && *csWillTopic) {
! 153: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
! 154: topic->var_sb.val = htons(strlen(csWillTopic));
! 155: memcpy(topic->var_data, csWillTopic, ntohs(topic->var_sb.val));
! 156: siz += MQTTHDR_VAR_SIZEOF(topic);
! 157:
! 158: wmsg = (mqtthdr_var_t*) (buf->msg_base + siz);
! 159: if (csWillMessage && *csWillMessage) {
! 160: wmsg->var_sb.val = htons(strlen(csWillMessage));
! 161: memcpy(wmsg->var_data, csWillMessage, ntohs(wmsg->var_sb.val));
! 162: } else
! 163: wmsg->var_sb.val = 0;
! 164: siz += MQTTHDR_VAR_SIZEOF(wmsg);
! 165: }
! 166:
! 167: /* If defined Username & Password */
! 168: if (csUser && *csUser) {
! 169: user = (mqtthdr_var_t*) (buf->msg_base + siz);
! 170: user->var_sb.val = htons(strlen(csUser));
! 171: memcpy(user->var_data, csUser, ntohs(user->var_sb.val));
! 172: siz += MQTTHDR_VAR_SIZEOF(user);
! 173:
! 174: if (csPass && *csPass) {
! 175: pass = (mqtthdr_var_t*) (buf->msg_base + siz);
! 176: pass->var_sb.val = htons(strlen(csPass));
! 177: memcpy(pass->var_data, csPass, ntohs(pass->var_sb.val));
! 178: siz += MQTTHDR_VAR_SIZEOF(pass);
! 179: }
! 180: }
! 181:
! 182: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
! 183: mqtt_msgRealloc(buf, siz);
! 184: return siz;
! 185: }
! 186:
! 187: /*
! 188: * mqtt_msgCONNACK() Create CONNACK message
! 189: *
! 190: * @buf = Message buffer
! 191: * @retcode = Return code
! 192: * return: -1 error or >-1 message size for send
! 193: */
! 194: int
! 195: mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, u_char retcode)
! 196: {
! 197: int siz = 0;
! 198: struct mqtthdr *hdr;
! 199: mqtthdr_connack_t *ack;
! 200:
! 201: if (!buf)
! 202: return -1;
! 203: if (retcode > MQTT_RETCODE_DENIED) {
! 204: mqtt_SetErr(EINVAL, "Error:: invalid retcode");
! 205: return -1;
! 206: }
! 207:
! 208: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtthdr_connack_t)) == -1)
! 209: return -1;
! 210: else {
! 211: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 212: siz += sizeof(struct mqtthdr);
! 213: ack = (mqtthdr_connack_t*) (buf->msg_base + siz);
! 214: siz += sizeof(mqtthdr_connack_t);
! 215: }
! 216:
! 217: /* fixed header */
! 218: MQTTHDR_MSGINIT(hdr);
! 219: hdr->mqtt_msg.type = MQTT_TYPE_CONNACK;
! 220: *hdr->mqtt_len = sizeof(mqtthdr_connack_t);
! 221:
! 222: /* CONNACK header */
! 223: ack->reserved = 0;
! 224: ack->retcode = retcode;
! 225:
! 226: return siz;
! 227: }
! 228:
! 229: static int
! 230: _mqtt_msgSIMPLE_(mqtt_msg_t * __restrict buf, u_char cmd)
! 231: {
! 232: int siz = 0;
! 233: struct mqtthdr *hdr;
! 234:
! 235: if (!buf)
! 236: return -1;
! 237:
! 238: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr)) == -1)
! 239: return -1;
! 240: else {
! 241: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 242: siz += sizeof(struct mqtthdr);
! 243: }
! 244:
! 245: /* fixed header */
! 246: MQTTHDR_MSGINIT(hdr);
! 247: hdr->mqtt_msg.type = cmd;
! 248: *hdr->mqtt_len = 0;
! 249:
! 250: return siz;
! 251: }
! 252:
! 253: /*
! 254: * mqtt_msgPINGREQ() Create PINGREQ message
! 255: *
! 256: * @buf = Message buffer
! 257: * return: -1 error or >-1 message size for send
! 258: */
! 259: int
! 260: mqtt_msgPINGREQ(mqtt_msg_t * __restrict buf)
! 261: {
! 262: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGREQ);
! 263: }
! 264:
! 265: /*
! 266: * mqtt_msgPINGRESP() Create PINGRESP message
! 267: *
! 268: * @buf = Message buffer
! 269: * return: -1 error or >-1 message size for send
! 270: */
! 271: int
! 272: mqtt_msgPINGRESP(mqtt_msg_t * __restrict buf)
! 273: {
! 274: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGRESP);
! 275: }
! 276:
! 277: /*
! 278: * mqtt_msgDISCONNECT() Create DISCONNECT message
! 279: *
! 280: * @buf = Message buffer
! 281: * return: -1 error or >-1 message size for send
! 282: */
! 283: int
! 284: mqtt_msgDISCONNECT(mqtt_msg_t * __restrict buf)
! 285: {
! 286: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_DISCONNECT);
! 287: }
! 288:
! 289: /* ============= decode ============ */
! 290:
! 291: /*
! 292: * mqtt_readCONNECT() Read elements from CONNECT message
! 293: *
! 294: * @buf = Message buffer
! 295: * @kasec = Keep Alive in seconds for current connection
! 296: * @psConnID = ConnectID
! 297: * @connLen = ConnectID length
! 298: * @psUser = Username if !=NULL
! 299: * @userLen = Username length
! 300: * @psPass = Password for Username, only if csUser is set
! 301: * @passLen = Password length
! 302: * @psWillTopic = Will Topic if !=NULL Will Flags set into message and must be free()
! 303: * @psWillMessage = Will Message, may be NULL if !NULL must be free() after use!
! 304: * return: .reserved == 1 is error or == 0 connection flags & msg ok
! 305: */
! 306: mqtthdr_connack_t
! 307: mqtt_readCONNECT(mqtt_msg_t * __restrict buf, u_short *kasec, char * __restrict psConnID, int connLen,
! 308: char * __restrict psUser, int userLen, char * __restrict psPass, int passLen,
! 309: char ** __restrict psWillTopic, char ** __restrict psWillMessage)
! 310: {
! 311: mqtthdr_connflgs_t flg = { MQTT_CONNFLGS_INIT };
! 312: mqtthdr_connack_t cack = { 1, MQTT_RETCODE_DENIED };
! 313: struct mqtthdr *hdr;
! 314: mqtthdr_var_t *var;
! 315: mqtt_len_t *ka;
! 316: mqtthdr_protover_t *proto;
! 317: int len, ret;
! 318: caddr_t pos;
! 319:
! 320: if (!buf || !buf->msg_base || !buf->msg_len || !psConnID || !connLen)
! 321: return cack;
! 322:
! 323: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_CONNECT, &ret, &len);
! 324: if (!hdr)
! 325: return cack;
! 326: if (len < 12) {
! 327: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 328: return cack;
! 329: } else {
! 330: pos = buf->msg_base + ret + 1;
! 331: var = (mqtthdr_var_t*) pos;
! 332: }
! 333: /* check init string & protocol */
! 334: if (var->var_sb.sb.l != 6 || strncmp((char*) var->var_data, MQTT_CONN_STR, 6)) {
! 335: mqtt_SetErr(EINVAL, "Error:: invalid init string %.6s(%d)",
! 336: var->var_data, var->var_sb.sb.l);
! 337: cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL;
! 338: return cack;
! 339: } else {
! 340: pos += var->var_sb.sb.l + sizeof(mqtt_len_t);
! 341: proto = (mqtthdr_protover_t*) pos;
! 342: }
! 343: if (*proto != MQTT_PROTO_VER) {
! 344: mqtt_SetErr(EINVAL, "Error:: invalid protocol version %d", *pos);
! 345: cack.retcode = MQTT_RETCODE_REFUSE_VER;
! 346: return cack;
! 347: } else
! 348: pos++;
! 349: flg = *(mqtthdr_connflgs_t*) pos;
! 350: pos++;
! 351: ka = (mqtt_len_t*) pos;
! 352: *kasec = ntohs(ka->val);
! 353: pos += sizeof(mqtt_len_t);
! 354:
! 355: len -= pos - (caddr_t) var;
! 356:
! 357: /* get ConnID */
! 358: var = (mqtthdr_var_t*) pos;
! 359: len -= MQTTHDR_VAR_SIZEOF(var);
! 360: if (len < 0 || var->var_sb.sb.l > 23) {
! 361: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Connection ID %d", len);
! 362: cack.retcode = MQTT_RETCODE_REFUSE_ID;
! 363: return cack;
! 364: } else {
! 365: memset(psConnID, 0, connLen--);
! 366: memcpy(psConnID, var->var_data, ntohs(var->var_sb.val) > connLen ? connLen : ntohs(var->var_sb.val));
! 367: pos += MQTTHDR_VAR_SIZEOF(var);
! 368: }
! 369:
! 370: /* get Willz */
! 371: if (flg.will_flg) {
! 372: var = (mqtthdr_var_t*) pos;
! 373: len -= MQTTHDR_VAR_SIZEOF(var);
! 374: if (len < 0) {
! 375: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Will Topic %d", len);
! 376: cack.retcode = MQTT_RETCODE_REFUSE_ID;
! 377: return cack;
! 378: } else {
! 379: if (psWillTopic) {
! 380: *psWillTopic = malloc(ntohs(var->var_sb.val) + 1);
! 381: if (!*psWillTopic) {
! 382: LOGERR;
! 383: cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL;
! 384: return cack;
! 385: } else
! 386: memset(*psWillTopic, 0, ntohs(var->var_sb.val) + 1);
! 387: memcpy(*psWillTopic, var->var_data, ntohs(var->var_sb.val));
! 388: }
! 389: pos += MQTTHDR_VAR_SIZEOF(var);
! 390: }
! 391:
! 392: var = (mqtthdr_var_t*) pos;
! 393: len -= MQTTHDR_VAR_SIZEOF(var);
! 394: if (len < 0) {
! 395: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Will Message %d", len);
! 396: cack.retcode = MQTT_RETCODE_REFUSE_ID;
! 397: return cack;
! 398: } else {
! 399: if (psWillMessage) {
! 400: *psWillMessage = malloc(ntohs(var->var_sb.val) + 1);
! 401: if (!*psWillMessage) {
! 402: LOGERR;
! 403: cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL;
! 404: return cack;
! 405: } else
! 406: memset(*psWillMessage, 0, ntohs(var->var_sb.val) + 1);
! 407: memcpy(*psWillMessage, var->var_data, ntohs(var->var_sb.val));
! 408: }
! 409: pos += MQTTHDR_VAR_SIZEOF(var);
! 410: }
! 411: }
! 412:
! 413: /* get User/Pass */
! 414: if (flg.username) {
! 415: var = (mqtthdr_var_t*) pos;
! 416: len -= MQTTHDR_VAR_SIZEOF(var);
! 417: if (len < 0 || var->var_sb.sb.l > 12) {
! 418: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Username %d", len);
! 419: cack.retcode = MQTT_RETCODE_REFUSE_USERPASS;
! 420: return cack;
! 421: } else {
! 422: if (psUser && userLen) {
! 423: memset(psUser, 0, userLen--);
! 424: memcpy(psUser, var->var_data,
! 425: ntohs(var->var_sb.val) > userLen ? userLen : ntohs(var->var_sb.val));
! 426: }
! 427: pos += MQTTHDR_VAR_SIZEOF(var);
! 428: }
! 429: }
! 430: if (flg.password) {
! 431: var = (mqtthdr_var_t*) pos;
! 432: len -= MQTTHDR_VAR_SIZEOF(var);
! 433: if (len < 0 || var->var_sb.sb.l > 12) {
! 434: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Password %d", len);
! 435: cack.retcode = MQTT_RETCODE_REFUSE_USERPASS;
! 436: return cack;
! 437: } else {
! 438: if (psPass && passLen) {
! 439: memset(psPass, 0, passLen--);
! 440: memcpy(psPass, var->var_data,
! 441: ntohs(var->var_sb.val) > passLen ? passLen : ntohs(var->var_sb.val));
! 442: }
! 443: pos += MQTTHDR_VAR_SIZEOF(var);
! 444: }
! 445: }
! 446:
! 447: flg.reserved = 0;
! 448: cack.reserved = flg.flags;
! 449: cack.retcode = MQTT_RETCODE_ACCEPTED;
! 450: return cack;
! 451: }
! 452:
! 453: /*
! 454: * mqtt_readCONNACK() Read CONNACK message
! 455: *
! 456: * @buf = Message buffer
! 457: * return: -1 error or >-1 CONNECT message return code
! 458: */
! 459: u_char
! 460: mqtt_readCONNACK(mqtt_msg_t * __restrict buf)
! 461: {
! 462: int len, ret;
! 463: struct mqtthdr *hdr;
! 464: mqtthdr_connack_t *ack;
! 465: caddr_t pos;
! 466:
! 467: if (!buf || !buf->msg_base || !buf->msg_len)
! 468: return (u_char) -1;
! 469:
! 470: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_CONNACK, &ret, &len);
! 471: if (!hdr)
! 472: return (u_char) -1;
! 473: if (len < sizeof(mqtthdr_connack_t)) {
! 474: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 475: return (u_char) -1;
! 476: } else {
! 477: pos = buf->msg_base + ret + 1;
! 478: ack = (mqtthdr_connack_t*) pos;
! 479: }
! 480:
! 481: if (ack->retcode > MQTT_RETCODE_DENIED) {
! 482: mqtt_SetErr(EINVAL, "Error:: invalid retcode %u", ack->retcode);
! 483: return (u_char) -1;
! 484: }
! 485:
! 486: return ack->retcode;
! 487: }
! 488:
! 489: /*
! 490: * mqtt_readDISCONNECT() Read DISCONNECT message
! 491: *
! 492: * @buf = Message buffer
! 493: * return: -1 error, 0 ok, >0 undefined result
! 494: */
! 495: int
! 496: mqtt_readDISCONNECT(mqtt_msg_t * __restrict buf)
! 497: {
! 498: int len, ret;
! 499: struct mqtthdr *hdr;
! 500:
! 501: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_DISCONNECT, &ret, &len);
! 502: if (!hdr || ret != 1)
! 503: return -1;
! 504:
! 505: return len;
! 506: }
! 507:
! 508: /*
! 509: * mqtt_readPINGREQ() Read PINGREQ message
! 510: *
! 511: * @buf = Message buffer
! 512: * return: -1 error, 0 ok, >0 undefined result
! 513: */
! 514: int
! 515: mqtt_readPINGREQ(mqtt_msg_t * __restrict buf)
! 516: {
! 517: int len, ret;
! 518: struct mqtthdr *hdr;
! 519:
! 520: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PINGREQ, &ret, &len);
! 521: if (!hdr || ret != 1)
! 522: return -1;
! 523:
! 524: return len;
! 525: }
! 526:
! 527: /*
! 528: * mqtt_readPINGRESP() Read PINGRESP message
! 529: *
! 530: * @buf = Message buffer
! 531: * return: -1 error, 0 ok, >0 undefined result
! 532: */
! 533: int
! 534: mqtt_readPINGRESP(mqtt_msg_t * __restrict buf)
! 535: {
! 536: int len, ret;
! 537: struct mqtthdr *hdr;
! 538:
! 539: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PINGRESP, &ret, &len);
! 540: if (!hdr || ret != 1)
! 541: return -1;
! 542:
! 543: return len;
! 544: }
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