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netsukuku/src/dnslib.c
Kirill Sotnikov f1761cad9a git repo init
2013-09-16 13:53:25 +04:00

889 lines
24 KiB
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/**************************************
* AUTHOR: Federico Tomassini *
* Copyright (C) Federico Tomassini *
* Contact effetom@gmail.com *
***********************************************
******* BEGIN 3/2006 ********
*************************************************************************
* *
* This program 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. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
************************************************************************/
#define _GNU_SOURCE
#include <string.h>
#include "dnslib.h"
#include "err_errno.h"
#include "log.h"
#include "xmalloc.h"
/*
* Takes a label: is there a ptr?
* Returns:
* -1 is a malformed label is found
* 0 if there's no pointer
* <offset from start_pkt> if a pointer is found
*/
int getlblptr(char *buf)
{
uint16_t dlbl;
char c[2];
memcpy(c,buf,2);
if (!LBL_PTR(*c)) /* No ptr */
return 0;
if (LBL_PTR(*c)!=LBL_PTR_MASK) {
debug(DBG_INSANE,"In getlblptr: invalid octet %02x",(unsigned char)c[0]);
err_ret(ERR_DNSMLO,-1);
}
(*c)&=LBL_PTR_OFF_MASK;
memcpy(&dlbl,c,2);
dlbl=ntohs(dlbl);
return dlbl; /* offset */
}
/*
* Reads a contiguous octet-sequence-label.
* Writes on dst.
* There are two limits:
* the name has to be less than MAX_SEQ_LBL_LEN
* we must stay in pkt_len
* -limit- is the less limit
*
* Returns:
* -1 On error
* Bytes readed if OK
*/
int read_label_octet(const char *src,char *dst,int limit)
{
int how;
how=*src++;
if ( how > limit || how > DNS_MAX_LABELS) {
error("In read_label_octet: got %d with limti %d\n",how,limit);
err_ret(ERR_DNSMSL,-1);
}
memcpy(dst,src,how);
return how;
}
/*
* Converts a dns compliant sequence label name to string.
* we start to read at -buf-
* we need start_pkt for pointers
* we need limit to remain under pktlen
* Returns:
* Bytes readed if OK
* -1 on error
*/
int lbltoname(char *buf,char *start_pkt,char *dst,int limit)
{
char *crow;
int how,recursion=0;
int ptr;
int writed=0,readed=0;
int new_limit=limit;
crow=buf;
while (*crow) {
ptr=getlblptr(crow);
if (ptr) { /* Got a pointer.... or got an error*/
if (ptr==-1) {
debug(DBG_INSANE,err_str);
err_ret(ERR_DNSMSL,-1);
}
if (++recursion>MAX_RECURSION_PTR)
err_ret(ERR_DNSTRP,-1);
if (recursion==1) readed+=2; /* we read the pointer */
crow=start_pkt+ptr;
new_limit=limit - (int)(crow - buf);
if (new_limit<=0 || new_limit > (int)(buf-start_pkt)+limit)
err_ret(ERR_DNSPLB,-1);
if (getlblptr(crow))
err_ret(ERR_DNSPTP,-1);
}
how=read_label_octet(crow,dst,min(new_limit,DNS_MAX_HNAME_LEN-writed));
if (how==-1) {
debug(DBG_INSANE,err_str);
err_ret(ERR_DNSMSL,-1);
}
if (!recursion)
readed+=how+1;
writed+=how+1;
dst+=how;
crow+=how+1;
*dst++=(*crow)?'.':0;
}
if (!recursion) readed++;
return readed;
}
/*
* DNS PTR query ask for 4.3.2.1.in-addr.arpa to know
* who is 1.2.3.4.
* This function reads this type of query transalting it
* in the second form.
* Writes result on *dst.
* -1 on error.
*/
int swap_straddr(char *src,char *dst)
{
char a[3];
int i,slen;
char *crow,*tmp,*atom;
int count=0,offset=0;
slen=strlen(src);
if (slen>DNS_MAX_HNAME_LEN)
goto mlf_addr;
tmp=src;
for (i=0;i<4;i++) {
count=0;
atom=a;
while (*tmp && *tmp!='.') {
if (count>2)
goto mlf_addr;
*atom++=*tmp++;
count++;
}
if (!count)
goto mlf_addr;
crow=dst+slen-count-offset;
strncpy(crow,a,count);
offset+=count;
if (!(*tmp))
break;
else {
if (i==3)
goto mlf_addr;
*(crow-1)='.';
offset++;
tmp++;
}
}
*(dst+slen)=0;
return 0;
mlf_addr:
debug(DBG_INSANE,"in swap_straddr: invalid address `%s`.\n",src);
err_ret(ERR_DNSMDD,-1);
}
int swap_straddr6(char *src,char *dst)
{
int slen;
char *tmp;
slen=strlen(src);
tmp=src+slen-1;
while (tmp!=src)
*dst++=*tmp--;
*dst++=*tmp;
*dst=0;
return 0;
}
int rm_inv_prefix(char *src,char *dst)
{
char *temp;
int ret;
if (!src) {
debug(DBG_INSANE,"In rm_inv_prefix: NULL argument!");
err_ret(ERR_DNSMDD,-1);
}
if( ! \
( (temp=(char*)strcasestr(src,DNS_INV_PREFIX)) ||\
(temp=(char*)strcasestr(src,DNS_INV_PREFIX6)) ||\
(temp=(char*)strcasestr(src,OLD_DNS_INV_PREFIX6)))) {
debug(DBG_INSANE,"In rm_inv_prefix(): no suffix for PTR query.");
err_ret(ERR_DNSMDD,-1);
}
if (temp-src>=DNS_MAX_HNAME_LEN) {
error("In rm_inv_prefix(): name too long.");
err_ret(ERR_DNSMDD,-1);
}
ret=strstr(temp,"6")?AF_INET6:AF_INET;
strncpy(dst,src,temp-src);
dst[temp-src]=0;
return ret;
}
int add_inv_prefix(char *s,int family)
{
int len;
len=strlen(s);
if (family==AF_INET)
strcat(s,DNS_INV_PREFIX);
else
strcat(s,DNS_INV_PREFIX6);
return 0;
}
int swapped_straddr(char *src,char *dst)
{
char temp[DNS_MAX_HNAME_LEN];
int res;
res=rm_inv_prefix(src,temp);
if (res==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
if (res==AF_INET)
res=swap_straddr(temp,dst);
else
res=swap_straddr6(temp,dst);
if (res==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
return 0;
}
int swapped_straddr_pref(char *src,char *dst,int family)
{
int res;
if (family==AF_INET)
res=swap_straddr(src,dst);
else
res=swap_straddr6(src,dst);
if (res==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
add_inv_prefix(dst,family);
return 0;
}
/*
* Converts a domain_name_string into a sequence label format,
* dns compliant. Writes on dst.
* -1 on error, number of bytes writed on success
*/
int nametolbl(char *name,char *dst)
{
char *crow;
int offset=0,res;
if (strlen(name)>DNS_MAX_HNAME_LEN) {
debug(DBG_INSANE,"Malformed name: %s.",name);
err_ret(ERR_DNSMDA,-1);
}
while ((crow=strstr(name+1,"."))) {
res=crow-name;
if (res>DNS_MAX_LABELS) {
debug(DBG_INSANE,"Malformed name: %s.",name);
err_ret(ERR_DNSMDA,-1);
}
*dst=(char)res; /* write the octet length */
dst++;
offset++;
memcpy(dst,name,(size_t)res); /* write label */
name+=res+1;dst+=res;offset+=res; /* shift ptrs */
}
if (!name) return offset;
if((res=(char)strlen(name))>DNS_MAX_LABELS) {
debug(DBG_INSANE,"Malformed name: %s",name);
err_ret(ERR_DNSMDA,-1);
}
*dst++=(char)res;
strcpy(dst,name);
offset+=res+2;
return offset;
}
/*
* Disassembles DNS packet headers, writing a yet allocated
* dns_pkt_hdr struct.
* No controls on len, bcz <<--the min_pkt_len is controlled
* by recv.-->>
* Returns the number of bytes readed (always DNS_HDR_SZ).
*/
int d_hdr_u(char *buf,dns_pkt_hdr *dph)
{
uint8_t c;
uint16_t s;
// ROW 1
memcpy(&s,buf,sizeof(uint16_t));
dph->id=ntohs(s);
// ROW 2
buf+=2;
memcpy(&c,buf,sizeof(uint8_t));
dph->qr= (c>>7)&0x01;
dph->opcode=(c>>3)&0x0f;
dph->aa=(c>>2)&0x01;
dph->tc=(c>>1)&0x01;
dph->rd=c&0x01;
buf++;
memcpy(&c,buf,sizeof(uint8_t));
dph->ra=(c>>7)&0x01;
dph->z=(c>>4)&0x07;
dph->rcode=c&0x0f;
// ROW 3
buf++;
memcpy(&s,buf,sizeof(uint16_t));
dph->qdcount=ntohs(s);
// ROW 4
buf+=2;
memcpy(&s,buf,sizeof(uint16_t));
dph->ancount=ntohs(s);
// ROW 5
buf+=2;
memcpy(&s,buf,sizeof(uint16_t));
dph->nscount=ntohs(s);
// ROW 6
buf+=2;
memcpy(&s,buf,sizeof(uint16_t));
dph->arcount=ntohs(s);
buf+=2;
return DNS_HDR_SZ; // i.e. 12 :)
}
/*
* This function alloc a new dns_pkt_qst to store a dns_question_section.
* The new dns_pkt_qst is also added to the principal dp-struct
* Returns bytes readed if OK. -1 otherwise.
*/
int d_qst_u(char *start_buf,char *buf,dns_pkt *dp,int limit_len)
{
int count;
uint16_t s;
dns_pkt_qst *dpq;
dpq=dns_add_qst(dp);
/* get name */
if((count=lbltoname(buf,start_buf,dpq->qname,limit_len))==-1) {
error(err_str);
err_ret(ERR_DNSMDD,1);
}
buf+=count;
/* Now we have to write 2+2 bytes */
if (count+4>limit_len)
err_ret(ERR_DNSPLB,1);
/* shift to type and class */
memcpy(&s,buf,2);
dpq->qtype=ntohs(s);
count+=2;
buf+=2;
memcpy(&s,buf,2);
dpq->qclass=ntohs(s);
count+=2;
return count;
}
/*
* Disassembles a DNS qst_section_set.
* Use the above function for each question section.
* -1 on error. Number of bytes readed on success.
* If -1 is returned, rcode ha sto be set to E_INTRPRT
*/
int d_qsts_u(char *start_buf,char *buf,dns_pkt *dp,int limit_len)
{
int offset=0,res;
int i,count;
if (!(count=DP_QDCOUNT(dp)))
return 0; /* No questions. */
for(i=0;i<count;i++) {
if ( (res=d_qst_u(start_buf,buf+offset,dp,limit_len-offset))==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
offset+=res;
}
return offset;
}
/*
* The behavior of this function is in all similar to dpkttoqst.
* Returns -1 on error. Bytes readed otherwise.
*/
int d_a_u(char *start_buf,char *buf,dns_pkt_a **dpa_orig,int limit_len)
{
int count,rdlen;
dns_pkt_a *dpa;
uint16_t s;
uint32_t ui;
dpa=dns_add_a(dpa_orig);
/* get name */
if((count=lbltoname(buf,start_buf,dpa->name,limit_len))==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
buf+=count;
/* Now we have to write 2+2+4+2 bytes */
if (count+10>limit_len)
err_ret(ERR_DNSPLB,-1);
memcpy(&s,buf,2);
dpa->type=ntohs(s);
count+=2;
buf+=2;
memcpy(&s,buf,2);
dpa->cl=ntohs(s);
count+=2;
buf+=2;
memcpy(&ui,buf,4);
dpa->ttl=ntohl(ui);
count+=4;
buf+=4;
memcpy(&s,buf,2);
dpa->rdlength=ntohs(s);
count+=2;
buf+=2;
rdlen=dpa->rdlength;
if (rdlen>DNS_MAX_HNAME_LEN)
err_ret(ERR_DNSMDD,-1);
/* Now we have to write dpa->rdlength bytes */
if (count+rdlen>limit_len)
err_ret(ERR_DNSPLB,-1);
if (dpa->type==T_A) {
memcpy(dpa->rdata,buf,rdlen); /* 32bit address */
count+=rdlen;
}
else if (dpa->type==T_MX) {
memcpy(dpa->rdata,buf,2);
if ((ui=lbltoname(buf+2,start_buf,dpa->rdata+2,rdlen-2))==-1) {
error(err_str);
err_ret(ERR_DNSMDD,-1);
}
if (rdlen!=ui+2) {
debug(DBG_NORMAL,"In d_a_u(): rdlen (%d) differs from readed bytes (%d).",rdlen,ui+2);
err_ret(ERR_DNSMDD,-1);
}
count+=2+ui;
} else {
if ((ui=lbltoname(buf,start_buf,dpa->rdata,rdlen))==-1) {
error(err_str);
err_intret(ERR_DNSMDD);
}
if (rdlen!=ui) {
debug(DBG_NORMAL,"In d_a_u(): rdlen (%d) differs from readed bytes (%d).",rdlen,ui);
err_ret(ERR_DNSMDD,-1);
}
count+=ui;
}
return count;
}
/*
* like d_qs_u. count is the number of section to read.
* -1 on error. Bytes readed otherwise.
*/
int d_as_u(char *start_buf,char *buf,dns_pkt_a **dpa,int limit_len,int count)
{
int offset=0,res;
int i;
if (!count) return 0;
for(i=0;i<count;i++) {
if ((res=d_a_u(start_buf,buf+offset,dpa,limit_len-offset))==-1) {
error(err_str);
err_intret(ERR_DNSMDD);
}
offset+=res;
}
return offset;
}
/*
* This is a main function: takes the pkt-buf and translate
* it in structured data.
* It cares about dns_pkt allocations.
*
* Returns:
* -1 on E_INTRPRT
* 0 if pkt must be discarded.
* Number of bytes readed otherwise
*/
int d_u(char *buf,int pktlen,dns_pkt **dpp)
{
dns_pkt *dp;
int offset=0,res;
char *crow;
crow=buf;
/* Controls pkt consistency: we must at least read pkt headers */
if (pktlen<DNS_HDR_SZ)
err_ret(ERR_DNSMDP,0);
*dpp=dp=create_dns_pkt();
/* Writes headers */
offset+=d_hdr_u(buf,&(dp->pkt_hdr));
if (pktlen > DNS_MAX_SZ) /* If pkt is too long: the headers are written,
* so we can reply with E_INTRPRT
*/
err_intret(ERR_DNSPLB);
crow+=offset;
/* Writes qsts */
if (dp->pkt_hdr.qdcount) {
if ((res=d_qsts_u(buf,crow,dp,pktlen-offset))==-1) {
error(err_str);
err_intret(ERR_DNSMDP);
}
offset+=res;
crow+=res;
}
if (dp->pkt_hdr.ancount) {
if ((res=d_as_u(buf,crow,&(dp->pkt_answ),pktlen-offset,DP_ANCOUNT(dp)))==-1) {
error(err_str);
err_intret(ERR_DNSMDP);
}
offset+=res;
}
/*crow+=res;
if ((res=dpkttoas(buf,crow,&(dp->pkt_auth),pktlen-offset,DP_NSCOUNT(dp)))==-1)
return -1;
offset+=res;
crow+=res;
if ((res=dpkttoas(buf,crow,&(dp->pkt_add),pktlen-offset,DP_ARCOUNT(dp)))==-1)
return -1;*/
return offset;
}
/*
* This function is the d_hdr_u inverse.
* Takes a dns_pkt struct and builds the
* header pkt-buffer
* Returns the number of bytes writed.
*/
int d_hdr_p(dns_pkt *dp,char *buf)
{
char *crow=buf;
uint16_t u;
dns_pkt_hdr *dph;
dph=&(dp->pkt_hdr);
u=htons(dph->id);
memcpy(buf,&u,2);
buf+=2;
if (dph->qr) *buf|=0x80;
*buf|=dph->opcode<<3;
*buf|=dph->aa<<2;
*buf|=dph->tc<<1;
*buf|=dph->rd;
buf++;
*buf|=dph->ra<<7;
*buf|=dph->z<<4;
*buf|=dph->rcode;
buf++;
u=htons(dph->qdcount);
memcpy(buf,&u,2);
buf+=2;
u=htons(dph->ancount);
memcpy(buf,&u,2);
buf+=2;
u=htons(dph->nscount);
memcpy(buf,&u,2);
buf+=2;
u=htons(dph->arcount);
memcpy(buf,&u,2);
buf+=2;
return (int)(buf-crow);
}
/*
* Translate a struct dns_pkt_qst in the dns-buffer buf.
* Returns:
* -1 On error
* Bytes writed otherwise.
*/
int d_qst_p(dns_pkt_qst *dpq,char *buf, int limitlen)
{
int offset;
uint16_t u;
if((offset=nametolbl(dpq->qname,buf))==-1) {
error(err_str);
err_ret(ERR_DNSMDA,-1);
}
if (offset+4>limitlen)
err_ret(ERR_DNSPLB,-1);
buf+=offset;
u=htons(dpq->qtype);
memcpy(buf,&u,2);
buf+=2;offset+=2;
u=htons(dpq->qclass);
memcpy(buf,&u,2);
buf+=2;offset+=2;
return offset;
}
/*
* Translates the question sections of a struct dns_pkt
* into buf.
* Returns:
* -1 on error.
* Number of bytes writed otherwise,
*/
int d_qsts_p(dns_pkt *dp,char *buf,int limitlen)
{
int offset=0,res;
int i;
dns_pkt_qst *dpq;
dpq=dp->pkt_qst;
for (i=0;dpq && i<DP_QDCOUNT(dp);i++) {
if ((res=d_qst_p(dpq,buf+offset,limitlen-offset))==-1) {
error(err_str);
err_ret(ERR_DNSMDA,-1);
}
offset+=res;
dpq=dpq->next;
}
return offset;
}
int d_a_p(dns_pkt_a *dpa,char *buf,int limitlen)
{
int offset,rdlen;
uint16_t u;
int i;
if((rdlen=nametolbl(dpa->name,buf))==-1)
return -1;
offset=rdlen;
if (offset+10>limitlen)
err_intret(ERR_DNSPLB);
buf+=offset;
u=htons(dpa->type);
memcpy(buf,&u,2);
buf+=2;offset+=2;
u=htons(dpa->cl);
memcpy(buf,&u,2);
buf+=2;offset+=2;
i=htonl(dpa->ttl);
memcpy(buf,&i,4);
buf+=4;offset+=4;
if (dpa->type==T_A) {
if (offset+dpa->rdlength>limitlen)
err_intret(ERR_DNSPLB);
memcpy(buf+2,dpa->rdata,dpa->rdlength);
offset+=dpa->rdlength;
} else if (dpa->type==T_MX) {
memcpy(buf+2,dpa->rdata,2);
if ((rdlen=nametolbl(dpa->rdata+2,buf+4))==-1) {
error(err_str);
err_ret(ERR_DNSMDA,-1);
}
offset+=rdlen+2;
if (offset>limitlen)
err_ret(ERR_DNSPLB,-1);
dpa->rdlength=rdlen+2;
} else {
if ((rdlen=nametolbl(dpa->rdata,buf+2))==-1) {
error(err_str);
err_ret(ERR_DNSMDA,-1);
}
offset+=rdlen;
if (offset>limitlen)
err_ret(ERR_DNSPLB,-1);
dpa->rdlength=rdlen;
}
u=htons(dpa->rdlength);
memcpy(buf,&u,2);
offset+=2;
return offset;
}
int d_as_p(dns_pkt_a *dpa,char *buf,int limitlen,int count)
{
int offset=0,res;
int i;
for (i=0;dpa && i<count;i++) {
if ((res=d_a_p(dpa,buf+offset,limitlen-offset))==-1) {
error(err_str);
err_ret(ERR_DNSMDA,-1);
}
offset+=res;
dpa=dpa->next;
}
return offset;
}
/*
* Transform a dns_pkt structure in char stream.
*
* Returns:
* -1 on error
* len(stream) if OK
*
* The stream has at least the header section writed.
* `buf' must be at least of DNS_MAX_SZ bytes.
*
* DANGER: This function realeses *ALWAYS* the dns_pkt *dp!!!!
*/
int d_p(dns_pkt *dp,char *buf)
{
int offset,res;
memset(buf,0,DNS_MAX_SZ);
offset=d_hdr_p(dp,buf);
buf+=offset;
if((res=d_qsts_p(dp,buf,DNS_MAX_SZ-offset))==-1)
goto server_fail;
offset+=res;
buf+=res;
if ( (res=d_as_p(dp->pkt_answ,buf,DNS_MAX_SZ-offset,DP_ANCOUNT(dp)))==-1)
goto server_fail;
offset+=res;
/*buf+=res;
if ( (res=astodpkt(dp->pkt_auth,buf,DNS_MAX_SZ-offset,DP_NSCOUNT(dp)))==-1)
goto server_fail;
offset+=res;
buf+=res;*/
/*if ( (res=astodpkt(dp->pkt_add,buf,DNS_MAX_SZ-offset,DP_ARCOUNT(dp)))==-1)
goto server_fail;
offset+=res;*/
destroy_dns_pkt(dp);
return offset;
server_fail:
error(err_str);
destroy_dns_pkt(dp);
err_ret(ERR_DNSPDS,-1);
}
/* Memory Functions */
dns_pkt* create_dns_pkt(void)
{
dns_pkt *dp;
dp=xmalloc(DNS_PKT_SZ);
memset(dp,0,DNS_PKT_SZ);
dp->pkt_qst=NULL;
dp->pkt_answ=NULL;
dp->pkt_add=NULL;
dp->pkt_auth=NULL;
return dp;
}
dns_pkt_qst* create_dns_pkt_qst(void)
{
dns_pkt_qst *dpq;
dpq=xmalloc(DNS_PKT_QST_SZ);
dpq->next=NULL;
memset(dpq->qname,0,DNS_MAX_HNAME_LEN);
return dpq;
}
dns_pkt_a* create_dns_pkt_a(void)
{
dns_pkt_a *dpa;
dpa=xmalloc(DNS_PKT_A_SZ);
memset(dpa->name,0,DNS_MAX_HNAME_LEN);
memset(dpa->rdata,0,DNS_MAX_HNAME_LEN);
dpa->next=NULL;
return dpa;
}
dns_pkt_qst* dns_add_qst(dns_pkt *dp)
{
dns_pkt_qst *dpq,*temp;
dpq=create_dns_pkt_qst();
temp=dp->pkt_qst;
if (!temp) {
dp->pkt_qst=dpq;
return dpq;
}
while (temp->next) temp=temp->next;
temp->next=dpq;
return dpq;
}
void dns_del_last_qst(dns_pkt *dp)
{
dns_pkt_qst *dpq=dp->pkt_qst;
if (!dpq) return;
if (!(dpq->next)){
xfree(dpq);
dp->pkt_qst=NULL;
return;
}
while ((dpq->next)->next);
xfree(dpq->next);
dpq->next=NULL;
return;
}
dns_pkt_a* dns_add_a(dns_pkt_a **dpa)
{
dns_pkt_a *dpa_add,*a;
int count=0;
a=*dpa;
dpa_add=create_dns_pkt_a();
if (!a) {
(*dpa)=dpa_add;
}
else {
while (a->next) {
a=a->next;
count++;
}
a->next=dpa_add;
}
return dpa_add;
}
void dns_a_default_fill(dns_pkt *dp,dns_pkt_a *dpa)
{
strcpy(dpa->name,dp->pkt_qst->qname);
dpa->cl=C_IN;
dpa->ttl=DNS_TTL;
dpa->type=dp->pkt_qst->qtype;
}
void destroy_dns_pkt(dns_pkt *dp)
{
dns_pkt_a *dpa,*dpa_t;
dns_pkt_qst *dpq,*dpq_t;
if (dp->pkt_qst) {
dpq=dp->pkt_qst;
while (dpq) {
dpq_t=dpq->next;
xfree(dpq);
dpq=dpq_t;
}
}
if (dp->pkt_answ) {
dpa=dp->pkt_answ;
while (dpa) {
dpa_t=dpa->next;
xfree(dpa);
dpa=dpa_t;
}
}
if (dp->pkt_add) {
dpa=dp->pkt_add;
while (dpa) {
dpa_t=dpa->next;
xfree(dpa);
dpa=dpa_t;
}
}
if (dp->pkt_auth) {
dpa=dp->pkt_auth;
while (dpa) {
dpa_t=dpa->next;
xfree(dpa);
dpa=dpa_t;
}
}
xfree(dp);
return;
}
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