You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 

572 lines
14 KiB

//*****************************************************************************
//
//! \file dns.c
//! \brief DNS APIs Implement file.
//! \details Send DNS query & Receive DNS reponse. \n
//! It depends on stdlib.h & string.h in ansi-c library
//! \version 1.1.0
//! \date 2013/11/18
//! \par Revision history
//! <2013/10/21> 1st Release
//! <2013/12/20> V1.1.0
//! 1. Remove secondary DNS server in DNS_run
//! If 1st DNS_run failed, call DNS_run with 2nd DNS again
//! 2. DNS_timerHandler -> DNS_time_handler
//! 3. Remove the unused define
//! 4. Integrated dns.h dns.c & dns_parse.h dns_parse.c into dns.h & dns.c
//! <2013/12/20> V1.1.0
//! <2018/10/04> Modified HAL_GetTick for use with CircuitPython by Nick Moore
//!
//! \author Eric Jung & MidnightCow
//! \copyright
//!
//! Copyright (c) 2013, WIZnet Co., LTD.
//! All rights reserved.
//!
//! Redistribution and use in source and binary forms, with or without
//! modification, are permitted provided that the following conditions
//! are met:
//!
//! * Redistributions of source code must retain the above copyright
//! notice, this list of conditions and the following disclaimer.
//! * Redistributions in binary form must reproduce the above copyright
//! notice, this list of conditions and the following disclaimer in the
//! documentation and/or other materials provided with the distribution.
//! * Neither the name of the <ORGANIZATION> nor the names of its
//! contributors may be used to endorse or promote products derived
//! from this software without specific prior written permission.
//!
//! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//! AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//! IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//! ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
//! LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
//! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
//! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
//! THE POSSIBILITY OF SUCH DAMAGE.
//
//*****************************************************************************
#include <string.h>
#include <stdlib.h>
#include "supervisor/shared/tick.h"
//#include "Ethernet/socket.h"
//#include "Internet/DNS/dns.h"
#include "../../ethernet/socket.h"
#include "dns.h"
#ifdef _DNS_DEBUG_
#include <stdio.h>
#endif
#define INITRTT 2000L /* Initial smoothed response time */
#define MAXCNAME (MAX_DOMAIN_NAME + (MAX_DOMAIN_NAME>>1)) /* Maximum amount of cname recursion */
#define TYPE_A 1 /* Host address */
#define TYPE_NS 2 /* Name server */
#define TYPE_MD 3 /* Mail destination (obsolete) */
#define TYPE_MF 4 /* Mail forwarder (obsolete) */
#define TYPE_CNAME 5 /* Canonical name */
#define TYPE_SOA 6 /* Start of Authority */
#define TYPE_MB 7 /* Mailbox name (experimental) */
#define TYPE_MG 8 /* Mail group member (experimental) */
#define TYPE_MR 9 /* Mail rename name (experimental) */
#define TYPE_NULL 10 /* Null (experimental) */
#define TYPE_WKS 11 /* Well-known sockets */
#define TYPE_PTR 12 /* Pointer record */
#define TYPE_HINFO 13 /* Host information */
#define TYPE_MINFO 14 /* Mailbox information (experimental)*/
#define TYPE_MX 15 /* Mail exchanger */
#define TYPE_TXT 16 /* Text strings */
#define TYPE_ANY 255 /* Matches any type */
#define CLASS_IN 1 /* The ARPA Internet */
/* Round trip timing parameters */
#define AGAIN 8 /* Average RTT gain = 1/8 */
#define LAGAIN 3 /* Log2(AGAIN) */
#define DGAIN 4 /* Mean deviation gain = 1/4 */
#define LDGAIN 2 /* log2(DGAIN) */
/* Header for all domain messages */
struct dhdr
{
uint16_t id; /* Identification */
uint8_t qr; /* Query/Response */
#define QUERY 0
#define RESPONSE 1
uint8_t opcode;
#define IQUERY 1
uint8_t aa; /* Authoratative answer */
uint8_t tc; /* Truncation */
uint8_t rd; /* Recursion desired */
uint8_t ra; /* Recursion available */
uint8_t rcode; /* Response code */
#define NO_ERROR 0
#define FORMAT_ERROR 1
#define SERVER_FAIL 2
#define NAME_ERROR 3
#define NOT_IMPL 4
#define REFUSED 5
uint16_t qdcount; /* Question count */
uint16_t ancount; /* Answer count */
uint16_t nscount; /* Authority (name server) count */
uint16_t arcount; /* Additional record count */
};
uint8_t* pDNSMSG; // DNS message buffer
uint8_t DNS_SOCKET; // SOCKET number for DNS
uint16_t DNS_MSGID; // DNS message ID
uint32_t HAL_GetTick(void) {
return supervisor_ticks_ms32();
}
uint32_t hal_sys_tick;
/* converts uint16_t from network buffer to a host byte order integer. */
uint16_t get16(uint8_t * s)
{
uint16_t i;
i = *s++ << 8;
i = i + *s;
return i;
}
/* copies uint16_t to the network buffer with network byte order. */
uint8_t * put16(uint8_t * s, uint16_t i)
{
*s++ = i >> 8;
*s++ = i;
return s;
}
/*
* CONVERT A DOMAIN NAME TO THE HUMAN-READABLE FORM
*
* Description : This function converts a compressed domain name to the human-readable form
* Arguments : msg - is a pointer to the reply message
* compressed - is a pointer to the domain name in reply message.
* buf - is a pointer to the buffer for the human-readable form name.
* len - is the MAX. size of buffer.
* Returns : the length of compressed message
*/
int parse_name(uint8_t * msg, uint8_t * compressed, char * buf, int16_t len)
{
uint16_t slen; /* Length of current segment */
uint8_t * cp;
int clen = 0; /* Total length of compressed name */
int indirect = 0; /* Set if indirection encountered */
int nseg = 0; /* Total number of segments in name */
cp = compressed;
for (;;)
{
slen = *cp++; /* Length of this segment */
if (!indirect) clen++;
if ((slen & 0xc0) == 0xc0)
{
if (!indirect)
clen++;
indirect = 1;
/* Follow indirection */
cp = &msg[((slen & 0x3f)<<8) + *cp];
slen = *cp++;
}
if (slen == 0) /* zero length == all done */
break;
len -= slen + 1;
if (len < 0) return -1;
if (!indirect) clen += slen;
while (slen-- != 0) *buf++ = (char)*cp++;
*buf++ = '.';
nseg++;
}
if (nseg == 0)
{
/* Root name; represent as single dot */
*buf++ = '.';
len--;
}
*buf++ = '\0';
len--;
return clen; /* Length of compressed message */
}
/*
* PARSE QUESTION SECTION
*
* Description : This function parses the question record of the reply message.
* Arguments : msg - is a pointer to the reply message
* cp - is a pointer to the question record.
* Returns : a pointer the to next record.
*/
uint8_t * dns_question(uint8_t * msg, uint8_t * cp)
{
int len;
char name[MAXCNAME];
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
cp += 2; /* type */
cp += 2; /* class */
return cp;
}
/*
* PARSE ANSER SECTION
*
* Description : This function parses the answer record of the reply message.
* Arguments : msg - is a pointer to the reply message
* cp - is a pointer to the answer record.
* Returns : a pointer the to next record.
*/
uint8_t * dns_answer(uint8_t * msg, uint8_t * cp, uint8_t * ip_from_dns)
{
int len, type;
char name[MAXCNAME];
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
type = get16(cp);
cp += 2; /* type */
cp += 2; /* class */
cp += 4; /* ttl */
cp += 2; /* len */
switch (type)
{
case TYPE_A:
/* Just read the address directly into the structure */
ip_from_dns[0] = *cp++;
ip_from_dns[1] = *cp++;
ip_from_dns[2] = *cp++;
ip_from_dns[3] = *cp++;
break;
case TYPE_CNAME:
case TYPE_MB:
case TYPE_MG:
case TYPE_MR:
case TYPE_NS:
case TYPE_PTR:
/* These types all consist of a single domain name */
/* convert it to ASCII format */
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
break;
case TYPE_HINFO:
len = *cp++;
cp += len;
len = *cp++;
cp += len;
break;
case TYPE_MX:
cp += 2;
/* Get domain name of exchanger */
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
break;
case TYPE_SOA:
/* Get domain name of name server */
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
/* Get domain name of responsible person */
len = parse_name(msg, cp, name, MAXCNAME);
if (len == -1) return 0;
cp += len;
cp += 4;
cp += 4;
cp += 4;
cp += 4;
cp += 4;
break;
case TYPE_TXT:
/* Just stash */
break;
default:
/* Ignore */
break;
}
return cp;
}
/*
* PARSE THE DNS REPLY
*
* Description : This function parses the reply message from DNS server.
* Arguments : dhdr - is a pointer to the header for DNS message
* buf - is a pointer to the reply message.
* len - is the size of reply message.
* Returns : -1 - Domain name length is too big
* 0 - Fail (Timeout or parse error)
* 1 - Success,
*/
int8_t parseDNSMSG(struct dhdr * pdhdr, uint8_t * pbuf, uint8_t * ip_from_dns)
{
uint16_t tmp;
uint16_t i;
uint8_t * msg;
uint8_t * cp;
msg = pbuf;
memset(pdhdr, 0, sizeof(*pdhdr));
pdhdr->id = get16(&msg[0]);
tmp = get16(&msg[2]);
if (tmp & 0x8000) pdhdr->qr = 1;
pdhdr->opcode = (tmp >> 11) & 0xf;
if (tmp & 0x0400) pdhdr->aa = 1;
if (tmp & 0x0200) pdhdr->tc = 1;
if (tmp & 0x0100) pdhdr->rd = 1;
if (tmp & 0x0080) pdhdr->ra = 1;
pdhdr->rcode = tmp & 0xf;
pdhdr->qdcount = get16(&msg[4]);
pdhdr->ancount = get16(&msg[6]);
pdhdr->nscount = get16(&msg[8]);
pdhdr->arcount = get16(&msg[10]);
/* Now parse the variable length sections */
cp = &msg[12];
/* Question section */
for (i = 0; i < pdhdr->qdcount; i++)
{
cp = dns_question(msg, cp);
if(!cp)
{
#ifdef _DNS_DEBUG_
printf("MAX_DOMAIN_NAME is too small, it should be redefined in dns.h\r\n");
#endif
return -1;
}
}
/* Answer section */
for (i = 0; i < pdhdr->ancount; i++)
{
cp = dns_answer(msg, cp, ip_from_dns);
if(!cp)
{
#ifdef _DNS_DEBUG_
printf("MAX_DOMAIN_NAME is too small, it should be redefined in dns.h\r\n");
#endif
return -1;
}
}
/* Name server (authority) section */
for (i = 0; i < pdhdr->nscount; i++)
{
;
}
/* Additional section */
for (i = 0; i < pdhdr->arcount; i++)
{
;
}
if(pdhdr->rcode == 0) return 1; // No error
else return 0;
}
/*
* MAKE DNS QUERY MESSAGE
*
* Description : This function makes DNS query message.
* Arguments : op - Recursion desired
* name - is a pointer to the domain name.
* buf - is a pointer to the buffer for DNS message.
* len - is the MAX. size of buffer.
* Returns : the pointer to the DNS message.
*/
int16_t dns_makequery(uint16_t op, char * name, uint8_t * buf, uint16_t len)
{
uint8_t *cp;
char *cp1;
char sname[MAXCNAME];
char *dname;
uint16_t p;
uint16_t dlen;
cp = buf;
DNS_MSGID++;
cp = put16(cp, DNS_MSGID);
p = (op << 11) | 0x0100; /* Recursion desired */
cp = put16(cp, p);
cp = put16(cp, 1);
cp = put16(cp, 0);
cp = put16(cp, 0);
cp = put16(cp, 0);
strcpy(sname, name);
dname = sname;
dlen = strlen(dname);
for (;;)
{
/* Look for next dot */
cp1 = strchr(dname, '.');
if (cp1 != NULL) len = cp1 - dname; /* More to come */
else len = dlen; /* Last component */
*cp++ = len; /* Write length of component */
if (len == 0) break;
/* Copy component up to (but not including) dot */
memcpy(cp, dname, len);
cp += len;
if (cp1 == NULL)
{
*cp++ = 0; /* Last one; write null and finish */
break;
}
dname += len+1;
dlen -= len+1;
}
cp = put16(cp, 0x0001); /* type */
cp = put16(cp, 0x0001); /* class */
return ((int16_t)((uint32_t)(cp) - (uint32_t)(buf)));
}
/*
* CHECK DNS TIMEOUT
*
* Description : This function check the DNS timeout
* Arguments : None.
* Returns : -1 - timeout occurred, 0 - timer over, but no timeout, 1 - no timer over, no timeout occur
* Note : timeout : retry count and timer both over.
*/
int8_t check_DNS_timeout(void)
{
static uint8_t retry_count;
uint32_t tick = HAL_GetTick();
if(tick - hal_sys_tick >= DNS_WAIT_TIME * 1000)
{
hal_sys_tick = tick;
if(retry_count >= MAX_DNS_RETRY) {
retry_count = 0;
return -1; // timeout occurred
}
retry_count++;
return 0; // timer over, but no timeout
}
return 1; // no timer over, no timeout occur
}
/* DNS CLIENT INIT */
void DNS_init(uint8_t s, uint8_t * buf)
{
DNS_SOCKET = s; // SOCK_DNS
pDNSMSG = buf; // User's shared buffer
DNS_MSGID = DNS_MSG_ID;
}
/* DNS CLIENT RUN */
int8_t DNS_run(uint8_t * dns_ip, uint8_t * name, uint8_t * ip_from_dns)
{
int8_t ret;
struct dhdr dhp;
uint8_t ip[4];
uint16_t len, port;
int8_t ret_check_timeout;
hal_sys_tick = HAL_GetTick();
// Socket open
WIZCHIP_EXPORT(socket)(DNS_SOCKET, Sn_MR_UDP, 0, 0);
#ifdef _DNS_DEBUG_
printf("> DNS Query to DNS Server : %d.%d.%d.%d\r\n", dns_ip[0], dns_ip[1], dns_ip[2], dns_ip[3]);
#endif
len = dns_makequery(0, (char *)name, pDNSMSG, MAX_DNS_BUF_SIZE);
WIZCHIP_EXPORT(sendto)(DNS_SOCKET, pDNSMSG, len, dns_ip, IPPORT_DOMAIN);
while (1)
{
if ((len = getSn_RX_RSR(DNS_SOCKET)) > 0)
{
if (len > MAX_DNS_BUF_SIZE) len = MAX_DNS_BUF_SIZE;
len = WIZCHIP_EXPORT(recvfrom)(DNS_SOCKET, pDNSMSG, len, ip, &port);
#ifdef _DNS_DEBUG_
printf("> Receive DNS message from %d.%d.%d.%d(%d). len = %d\r\n", ip[0], ip[1], ip[2], ip[3],port,len);
#endif
ret = parseDNSMSG(&dhp, pDNSMSG, ip_from_dns);
break;
}
// Check Timeout
ret_check_timeout = check_DNS_timeout();
if (ret_check_timeout < 0) {
#ifdef _DNS_DEBUG_
printf("> DNS Server is not responding : %d.%d.%d.%d\r\n", dns_ip[0], dns_ip[1], dns_ip[2], dns_ip[3]);
#endif
return 0; // timeout occurred
}
else if (ret_check_timeout == 0) {
#ifdef _DNS_DEBUG_
printf("> DNS Timeout\r\n");
#endif
WIZCHIP_EXPORT(sendto)(DNS_SOCKET, pDNSMSG, len, dns_ip, IPPORT_DOMAIN);
}
}
WIZCHIP_EXPORT(close)(DNS_SOCKET);
// Return value
// 0 > : failed / 1 - success
return ret;
}