version 1.3.12.1, 2022/09/13 20:37:21
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version 1.3.12.5, 2022/09/15 21:06:05
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Line 12 terms:
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Line 12 terms:
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All of the documentation and software included in the ELWIX and AITNET |
All of the documentation and software included in the ELWIX and AITNET |
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org> |
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org> |
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Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 | Copyright 2004 - 2022 |
by Michael Pounov <misho@elwix.org>. All rights reserved. |
by Michael Pounov <misho@elwix.org>. All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
Redistribution and use in source and binary forms, with or without |
Line 49 SUCH DAMAGE.
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Line 49 SUCH DAMAGE.
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/* |
/* |
* mqtt_msgCONNECT() Create CONNECT message |
* mqtt_msgCONNECT() Create CONNECT message |
* |
* |
* @buf = Message buffer |
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* @csConnID = ConnectID |
* @csConnID = ConnectID |
* @kasec = Keep alive timeout, if =0 default timeout for MQTT | * @Version = MQTT version, if =0 default version is 3.1.1 |
| * @KASec = Keep alive timeout, if =0 default timeout for MQTT |
* @csUser = Username if !=NULL |
* @csUser = Username if !=NULL |
* @csPass = Password for Username, only if csUser is set |
* @csPass = Password for Username, only if csUser is set |
* @csWillTopic = Will Topic if !=NULL Will Flags set into message |
* @csWillTopic = Will Topic if !=NULL Will Flags set into message |
Line 59 SUCH DAMAGE.
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Line 59 SUCH DAMAGE.
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* @ClrSess = Clear Session subscriptions after disconnect |
* @ClrSess = Clear Session subscriptions after disconnect |
* @WillQOS = Will QOS if csWillTopic is set |
* @WillQOS = Will QOS if csWillTopic is set |
* @WillRetain = Will Retain Will Message if csWillTopic is set |
* @WillRetain = Will Retain Will Message if csWillTopic is set |
* return: -1 error or >-1 message size for send | * return: NULL error or allocated CONNECT message |
*/ |
*/ |
int | mqtt_msg_t * |
mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID, | mqtt_msgCONNECT(const char *csConnID, u_char Version, u_short KASec, |
u_short kasec, const char *csUser, const char *csPass, | const char *csUser, const char *csPass, |
const char *csWillTopic, const char *csWillMessage, |
const char *csWillTopic, const char *csWillMessage, |
u_char ClrSess, u_char WillQOS, u_char WillRetain) |
u_char ClrSess, u_char WillQOS, u_char WillRetain) |
{ |
{ |
int len, siz = 0; |
int len, siz = 0; |
u_int n, *l; |
u_int n, *l; |
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mqtt_msg_t *msg = NULL; |
struct mqtthdr *hdr; |
struct mqtthdr *hdr; |
mqtthdr_var_t *var, *cid, *topic, *wmsg, *user, *pass; |
mqtthdr_var_t *var, *cid, *topic, *wmsg, *user, *pass; |
mqtthdr_protover_t *proto; |
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mqtthdr_connflgs_t *flags; |
mqtthdr_connflgs_t *flags; |
mqtt_len_t *ka; |
mqtt_len_t *ka; |
void *data; |
void *data; |
|
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if (!buf || !csConnID) | if (!csConnID) |
return -1; | return NULL; |
if (strlen(csConnID) >= MQTT_CONNID_MAX) { |
if (strlen(csConnID) >= MQTT_CONNID_MAX) { |
mqtt_SetErr(EINVAL, "Invalid argument ConnID is too long (max %d bytes)", |
mqtt_SetErr(EINVAL, "Invalid argument ConnID is too long (max %d bytes)", |
MQTT_CONNID_MAX - 1); |
MQTT_CONNID_MAX - 1); |
return -1; | return NULL; |
} |
} |
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if (Version && (Version < MQTT_PROTO_VER_3 || Version > MQTT_PROTO_VER_5)) { |
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mqtt_SetErr(EINVAL, "Unsupported version"); |
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return NULL; |
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} |
if (csUser && strlen(csUser) >= MQTT_CRED_MAX) { |
if (csUser && strlen(csUser) >= MQTT_CRED_MAX) { |
mqtt_SetErr(EINVAL, "Invalid argument Username is too long (max %d bytes)", |
mqtt_SetErr(EINVAL, "Invalid argument Username is too long (max %d bytes)", |
MQTT_CRED_MAX - 1); |
MQTT_CRED_MAX - 1); |
return -1; | return NULL; |
} |
} |
if (csPass && strlen(csPass) >= MQTT_CRED_MAX) { |
if (csPass && strlen(csPass) >= MQTT_CRED_MAX) { |
mqtt_SetErr(EINVAL, "Invalid argument Password is too long (max %d bytes)", |
mqtt_SetErr(EINVAL, "Invalid argument Password is too long (max %d bytes)", |
MQTT_CRED_MAX - 1); |
MQTT_CRED_MAX - 1); |
return -1; | return NULL; |
} |
} |
if (WillQOS > MQTT_QOS_EXACTLY) { |
if (WillQOS > MQTT_QOS_EXACTLY) { |
mqtt_SetErr(EINVAL, "Invalid argument WillQOS - unknown QOS value"); |
mqtt_SetErr(EINVAL, "Invalid argument WillQOS - unknown QOS value"); |
return -1; | return NULL; |
} |
} |
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/* calculate message size */ |
/* calculate message size */ |
len = 10 + sizeof(mqtt_len_t); /* connect arguments */ | len = 10; /* connect arguments: MQTT(6)+Version(1)+ConnFlags(1)+KeepAlive(2) */ |
len += sizeof(mqtt_len_t) + strlen(csConnID); /* connect id */ |
len += sizeof(mqtt_len_t) + strlen(csConnID); /* connect id */ |
if (csUser && *csUser) { /* user/pass */ |
if (csUser && *csUser) { /* user/pass */ |
len += sizeof(mqtt_len_t) + strlen(csUser); |
len += sizeof(mqtt_len_t) + strlen(csUser); |
Line 116 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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Line 120 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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n = mqtt_encodeLen(len); /* message size */ |
n = mqtt_encodeLen(len); /* message size */ |
siz += mqtt_sizeLen(n) - 1; /* length size */ |
siz += mqtt_sizeLen(n) - 1; /* length size */ |
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if (mqtt_msgRealloc(buf, siz + len) == -1) | if (!(msg = mqtt_msgAlloc(siz + len))) |
return -1; | return NULL; |
else { |
else { |
data = buf->msg_base; | data = msg->msg_base; |
hdr = (struct mqtthdr *) data; |
hdr = (struct mqtthdr *) data; |
} |
} |
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/* fixed header */ |
/* fixed header */ |
MQTTHDR_MSGINIT(hdr); |
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hdr->mqtt_msg.type = MQTT_TYPE_CONNECT; |
hdr->mqtt_msg.type = MQTT_TYPE_CONNECT; |
l = (u_int*) hdr->mqtt_len; |
l = (u_int*) hdr->mqtt_len; |
*l = n; |
*l = n; |
Line 132 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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Line 135 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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/* variable header */ |
/* variable header */ |
var = (mqtthdr_var_t*) data; |
var = (mqtthdr_var_t*) data; |
var->var_sb.val = htons(strlen(MQTT_CONN_STR)); | var->var_sb.val = htons(strlen(MQTT_PROTO_STR)); |
memcpy(var->var_data, MQTT_CONN_STR, ntohs(var->var_sb.val)); | memcpy(var->var_data, MQTT_PROTO_STR, ntohs(var->var_sb.val)); |
data += MQTTHDR_VAR_SIZEOF(var); |
data += MQTTHDR_VAR_SIZEOF(var); |
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/* protocol version */ |
/* protocol version */ |
proto = (mqtthdr_protover_t*) data++; | *(u_char*) data++ = Version ? Version : MQTT_PROTO_VER_311; |
*proto = MQTT_PROTO_VER; | |
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/* CONNECT header */ |
/* CONNECT header */ |
flags = (mqtthdr_connflgs_t*) data++; |
flags = (mqtthdr_connflgs_t*) data++; |
Line 162 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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Line 164 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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/* keep alive */ |
/* keep alive */ |
ka = (mqtt_len_t*) data; |
ka = (mqtt_len_t*) data; |
ka->val = kasec ? htons(kasec) : htons(MQTT_KEEPALIVE); | ka->val = KASec ? htons(KASec) : htons(MQTT_KEEPALIVE); |
data += sizeof(mqtt_len_t); |
data += sizeof(mqtt_len_t); |
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/* ConnID */ |
/* ConnID */ |
Line 202 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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Line 204 mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const cha
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} |
} |
} |
} |
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return siz + len; | return msg; |
} |
} |
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/* |
/* |
* mqtt_msgCONNACK() Create CONNACK message |
* mqtt_msgCONNACK() Create CONNACK message |
* |
* |
* @buf = Message buffer |
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* @retcode = Return code |
* @retcode = Return code |
* return: -1 error or >-1 message size for send | * return: NULL error or allocated CONNACK message |
*/ |
*/ |
int | mqtt_msg_t * |
mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, u_char retcode) | mqtt_msgCONNACK(u_char retcode) |
{ |
{ |
int siz = 0; |
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struct mqtthdr *hdr; |
struct mqtthdr *hdr; |
mqtthdr_connack_t *ack; |
mqtthdr_connack_t *ack; |
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mqtt_msg_t *msg = NULL; |
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if (!buf) |
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return -1; |
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if (retcode > MQTT_RETCODE_DENIED) { |
if (retcode > MQTT_RETCODE_DENIED) { |
mqtt_SetErr(EINVAL, "Invalid retcode"); |
mqtt_SetErr(EINVAL, "Invalid retcode"); |
return -1; | return NULL; |
} |
} |
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if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtthdr_connack_t)) == -1) | if (!(msg = mqtt_msgAlloc(sizeof(struct mqtthdr) + sizeof(mqtthdr_connack_t)))) |
return -1; | return NULL; |
else { |
else { |
hdr = (struct mqtthdr *) (buf->msg_base + siz); | hdr = (struct mqtthdr *) msg->msg_base; |
siz += sizeof(struct mqtthdr); | ack = (mqtthdr_connack_t*) (msg->msg_base + sizeof(struct mqtthdr)); |
ack = (mqtthdr_connack_t*) (buf->msg_base + siz); | |
siz += sizeof(mqtthdr_connack_t); | |
} |
} |
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/* fixed header */ |
/* fixed header */ |
MQTTHDR_MSGINIT(hdr); |
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hdr->mqtt_msg.type = MQTT_TYPE_CONNACK; |
hdr->mqtt_msg.type = MQTT_TYPE_CONNACK; |
*hdr->mqtt_len = sizeof(mqtthdr_connack_t); |
*hdr->mqtt_len = sizeof(mqtthdr_connack_t); |
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Line 244 mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, u_char re
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Line 240 mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, u_char re
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ack->reserved = 0; |
ack->reserved = 0; |
ack->retcode = retcode; |
ack->retcode = retcode; |
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return siz; | return msg; |
} |
} |
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static int | static mqtt_msg_t * |
_mqtt_msgSIMPLE_(mqtt_msg_t * __restrict buf, u_char cmd) | _mqtt_msgSIMPLE_(u_char cmd) |
{ |
{ |
int siz = 0; |
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struct mqtthdr *hdr; |
struct mqtthdr *hdr; |
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mqtt_msg_t *msg = NULL; |
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if (!buf) | if (!(msg = mqtt_msgAlloc(sizeof(struct mqtthdr)))) |
return -1; | return NULL; |
| else |
| hdr = (struct mqtthdr *) msg->msg_base; |
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if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr)) == -1) |
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return -1; |
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else { |
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hdr = (struct mqtthdr *) (buf->msg_base + siz); |
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siz += sizeof(struct mqtthdr); |
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} |
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/* fixed header */ |
/* fixed header */ |
MQTTHDR_MSGINIT(hdr); |
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hdr->mqtt_msg.type = cmd; |
hdr->mqtt_msg.type = cmd; |
*hdr->mqtt_len = 0; |
*hdr->mqtt_len = 0; |
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return siz; | return msg; |
} |
} |
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/* |
/* |
* mqtt_msgPINGREQ() Create PINGREQ message |
* mqtt_msgPINGREQ() Create PINGREQ message |
* |
* |
* @buf = Message buffer | * return: NULL error or allocated message |
* return: -1 error or >-1 message size for send | |
*/ |
*/ |
int | mqtt_msg_t * |
mqtt_msgPINGREQ(mqtt_msg_t * __restrict buf) | mqtt_msgPINGREQ() |
{ |
{ |
return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGREQ); | return _mqtt_msgSIMPLE_(MQTT_TYPE_PINGREQ); |
} |
} |
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/* |
/* |
* mqtt_msgPINGRESP() Create PINGRESP message |
* mqtt_msgPINGRESP() Create PINGRESP message |
* |
* |
* @buf = Message buffer | * return: NULL error or allocated message |
* return: -1 error or >-1 message size for send | |
*/ |
*/ |
int | mqtt_msg_t * |
mqtt_msgPINGRESP(mqtt_msg_t * __restrict buf) | mqtt_msgPINGRESP() |
{ |
{ |
return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGRESP); | return _mqtt_msgSIMPLE_(MQTT_TYPE_PINGRESP); |
} |
} |
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/* |
/* |
* mqtt_msgDISCONNECT() Create DISCONNECT message |
* mqtt_msgDISCONNECT() Create DISCONNECT message |
* |
* |
* @buf = Message buffer | * return: NULL error or allocated message |
* return: -1 error or >-1 message size for send | |
*/ |
*/ |
int | mqtt_msg_t * |
mqtt_msgDISCONNECT(mqtt_msg_t * __restrict buf) | mqtt_msgDISCONNECT() |
{ |
{ |
return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_DISCONNECT); | return _mqtt_msgSIMPLE_(MQTT_TYPE_DISCONNECT); |
} | |
| |
/* ============= decode ============ */ | |
| |
/* | |
* mqtt_readCONNECT() Read elements from CONNECT message | |
* | |
* @buf = Message buffer | |
* @kasec = Keep Alive in seconds for current connection | |
* @psConnID = ConnectID | |
* @connLen = ConnectID length | |
* @psUser = Username if !=NULL | |
* @userLen = Username length | |
* @psPass = Password for Username, only if csUser is set | |
* @passLen = Password length | |
* @psWillTopic = Will Topic if !=NULL Will Flags set into message and must be free() | |
* @psWillMessage = Will Message, may be NULL if !NULL must be free() after use! | |
* return: .reserved == 1 is error or == 0 connection flags & msg ok | |
*/ | |
mqtthdr_connack_t | |
mqtt_readCONNECT(mqtt_msg_t * __restrict buf, u_short *kasec, char * __restrict psConnID, int connLen, | |
char * __restrict psUser, int userLen, char * __restrict psPass, int passLen, | |
char ** __restrict psWillTopic, char ** __restrict psWillMessage) | |
{ | |
mqtthdr_connflgs_t flg = { MQTT_CONNFLGS_INIT }; | |
mqtthdr_connack_t cack = { 1, MQTT_RETCODE_DENIED }; | |
struct mqtthdr *hdr; | |
mqtthdr_var_t *var; | |
mqtt_len_t *ka; | |
mqtthdr_protover_t *proto; | |
int len, ret; | |
caddr_t pos; | |
| |
if (!buf || !buf->msg_base || !buf->msg_len || !psConnID || !connLen) | |
return cack; | |
| |
hdr = _mqtt_readHEADER(buf, MQTT_TYPE_CONNECT, &ret, &len); | |
if (!hdr) | |
return cack; | |
if (len < 12) { | |
mqtt_SetErr(EINVAL, "Short message length %d", len); | |
return cack; | |
} else { | |
pos = buf->msg_base + ret + 1; | |
var = (mqtthdr_var_t*) pos; | |
} | |
/* check init string & protocol */ | |
if (var->var_sb.sb.l != 6 || strncmp((char*) var->var_data, MQTT_CONN_STR, 6)) { | |
mqtt_SetErr(EINVAL, "Invalid init string %.6s(%d)", | |
var->var_data, var->var_sb.sb.l); | |
cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL; | |
return cack; | |
} else { | |
pos += var->var_sb.sb.l + sizeof(mqtt_len_t); | |
proto = (mqtthdr_protover_t*) pos; | |
} | |
if (*proto != MQTT_PROTO_VER) { | |
mqtt_SetErr(EINVAL, "Invalid protocol version %d", *pos); | |
cack.retcode = MQTT_RETCODE_REFUSE_VER; | |
return cack; | |
} else | |
pos++; | |
flg = *(mqtthdr_connflgs_t*) pos; | |
pos++; | |
ka = (mqtt_len_t*) pos; | |
*kasec = ntohs(ka->val); | |
pos += sizeof(mqtt_len_t); | |
| |
len -= pos - (caddr_t) var; | |
| |
/* get ConnID */ | |
var = (mqtthdr_var_t*) pos; | |
len -= MQTTHDR_VAR_SIZEOF(var); | |
if (len < 0 || var->var_sb.sb.l > 23) { | |
mqtt_SetErr(EINVAL, "Unexpected EOM at Connection ID %d", len); | |
cack.retcode = MQTT_RETCODE_REFUSE_ID; | |
return cack; | |
} else { | |
memset(psConnID, 0, connLen--); | |
memcpy(psConnID, var->var_data, ntohs(var->var_sb.val) > connLen ? connLen : ntohs(var->var_sb.val)); | |
pos += MQTTHDR_VAR_SIZEOF(var); | |
} | |
| |
/* get Willz */ | |
if (flg.will_flg) { | |
var = (mqtthdr_var_t*) pos; | |
len -= MQTTHDR_VAR_SIZEOF(var); | |
if (len < 0) { | |
mqtt_SetErr(EINVAL, "Unexpected EOM at Will Topic %d", len); | |
cack.retcode = MQTT_RETCODE_REFUSE_ID; | |
return cack; | |
} else { | |
if (psWillTopic) { | |
*psWillTopic = malloc(ntohs(var->var_sb.val) + 1); | |
if (!*psWillTopic) { | |
LOGERR; | |
cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL; | |
return cack; | |
} else | |
memset(*psWillTopic, 0, ntohs(var->var_sb.val) + 1); | |
memcpy(*psWillTopic, var->var_data, ntohs(var->var_sb.val)); | |
} | |
pos += MQTTHDR_VAR_SIZEOF(var); | |
} | |
| |
var = (mqtthdr_var_t*) pos; | |
len -= MQTTHDR_VAR_SIZEOF(var); | |
if (len < 0) { | |
mqtt_SetErr(EINVAL, "Unexpected EOM at Will Message %d", len); | |
cack.retcode = MQTT_RETCODE_REFUSE_ID; | |
return cack; | |
} else { | |
if (psWillMessage) { | |
*psWillMessage = malloc(ntohs(var->var_sb.val) + 1); | |
if (!*psWillMessage) { | |
LOGERR; | |
cack.retcode = MQTT_RETCODE_REFUSE_UNAVAIL; | |
return cack; | |
} else | |
memset(*psWillMessage, 0, ntohs(var->var_sb.val) + 1); | |
memcpy(*psWillMessage, var->var_data, ntohs(var->var_sb.val)); | |
} | |
pos += MQTTHDR_VAR_SIZEOF(var); | |
} | |
} | |
| |
/* get User/Pass */ | |
if (flg.username) { | |
var = (mqtthdr_var_t*) pos; | |
len -= MQTTHDR_VAR_SIZEOF(var); | |
if (len < 0 || var->var_sb.sb.l > 12) { | |
mqtt_SetErr(EINVAL, "Unexpected EOM at Username %d", len); | |
cack.retcode = MQTT_RETCODE_REFUSE_USERPASS; | |
return cack; | |
} else { | |
if (psUser && userLen) { | |
memset(psUser, 0, userLen--); | |
memcpy(psUser, var->var_data, | |
ntohs(var->var_sb.val) > userLen ? userLen : ntohs(var->var_sb.val)); | |
} | |
pos += MQTTHDR_VAR_SIZEOF(var); | |
} | |
} | |
if (flg.password) { | |
var = (mqtthdr_var_t*) pos; | |
len -= MQTTHDR_VAR_SIZEOF(var); | |
if (len < 0 || var->var_sb.sb.l > 12) { | |
mqtt_SetErr(EINVAL, "Unexpected EOM at Password %d", len); | |
cack.retcode = MQTT_RETCODE_REFUSE_USERPASS; | |
return cack; | |
} else { | |
if (psPass && passLen) { | |
memset(psPass, 0, passLen--); | |
memcpy(psPass, var->var_data, | |
ntohs(var->var_sb.val) > passLen ? passLen : ntohs(var->var_sb.val)); | |
} | |
pos += MQTTHDR_VAR_SIZEOF(var); | |
} | |
} | |
| |
flg.reserved = 0; | |
cack.reserved = flg.flags; | |
cack.retcode = MQTT_RETCODE_ACCEPTED; | |
return cack; | |
} | |
| |
/* | |
* mqtt_readCONNACK() Read CONNACK message | |
* | |
* @buf = Message buffer | |
* return: -1 error or >-1 CONNECT message return code | |
*/ | |
u_char | |
mqtt_readCONNACK(mqtt_msg_t * __restrict buf) | |
{ | |
int len, ret; | |
struct mqtthdr *hdr; | |
mqtthdr_connack_t *ack; | |
caddr_t pos; | |
| |
if (!buf || !buf->msg_base || !buf->msg_len) | |
return (u_char) -1; | |
| |
hdr = _mqtt_readHEADER(buf, MQTT_TYPE_CONNACK, &ret, &len); | |
if (!hdr) | |
return (u_char) -1; | |
if (len < sizeof(mqtthdr_connack_t)) { | |
mqtt_SetErr(EINVAL, "Short message length %d", len); | |
return (u_char) -1; | |
} else { | |
pos = buf->msg_base + ret + 1; | |
ack = (mqtthdr_connack_t*) pos; | |
} | |
| |
if (ack->retcode > MQTT_RETCODE_DENIED) { | |
mqtt_SetErr(EINVAL, "Invalid retcode %u", ack->retcode); | |
return (u_char) -1; | |
} | |
| |
return ack->retcode; | |
} | |
| |
/* | |
* mqtt_readDISCONNECT() Read DISCONNECT message | |
* | |
* @buf = Message buffer | |
* return: -1 error, 0 ok, >0 undefined result | |
*/ | |
int | |
mqtt_readDISCONNECT(mqtt_msg_t * __restrict buf) | |
{ | |
int len, ret; | |
struct mqtthdr *hdr; | |
| |
hdr = _mqtt_readHEADER(buf, MQTT_TYPE_DISCONNECT, &ret, &len); | |
if (!hdr || ret != 1) | |
return -1; | |
| |
return len; | |
} | |
| |
/* | |
* mqtt_readPINGREQ() Read PINGREQ message | |
* | |
* @buf = Message buffer | |
* return: -1 error, 0 ok, >0 undefined result | |
*/ | |
int | |
mqtt_readPINGREQ(mqtt_msg_t * __restrict buf) | |
{ | |
int len, ret; | |
struct mqtthdr *hdr; | |
| |
hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PINGREQ, &ret, &len); | |
if (!hdr || ret != 1) | |
return -1; | |
| |
return len; | |
} | |
| |
/* | |
* mqtt_readPINGRESP() Read PINGRESP message | |
* | |
* @buf = Message buffer | |
* return: -1 error, 0 ok, >0 undefined result | |
*/ | |
int | |
mqtt_readPINGRESP(mqtt_msg_t * __restrict buf) | |
{ | |
int len, ret; | |
struct mqtthdr *hdr; | |
| |
hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PINGRESP, &ret, &len); | |
if (!hdr || ret != 1) | |
return -1; | |
| |
return len; | |
} |
} |