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circuitpython/drivers/wiznet5k/internet/dns/dns.c
Damien George bcf041f1a3 stmhal: Add wiznet5k module, to control WIZnet ethernet adaptor. 
Allows to create socket objects that support TCP and UDP in server and
client mode.  Interface is very close to standard Python socket class,
except bind and accept do not work the same (due to hardware not
supporting them in the usual way).

Not compiled by default.  To compile this module, use:
make MICROPY_PY_WIZNET5K=1
2014-09-01 22:52:38 +01:00

567 lines
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//*****************************************************************************
//
//! \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
//!
//! \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 "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
extern uint32_t HAL_GetTick(void);
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
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);
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 = 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
sendto(DNS_SOCKET, pDNSMSG, len, dns_ip, IPPORT_DOMAIN);
}
}
close(DNS_SOCKET);
// Return value
// 0 > : failed / 1 - success
return ret;
}
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