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energymech/src/dns.c

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Initial Import
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/*
EnergyMech, IRC bot software
march 9-10
2018-03-10 02:55:07 +01:00
Copyright (c) 1997-2018 proton
Initial Import
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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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define DNS_C
#include "config.h"
#ifdef RAWDNS
#include "defines.h"
#include "structs.h"
#include "global.h"
#include "h.h"
#include "text.h"
#include "mcmd.h"
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#define unpack_uint16_t(x) (((x)[0] << 8) | ((x)[1]))
#define unpack_uint32_t(x) (((x)[0] << 24) | ((x)[1] << 16) | ((x)[2] << 8) | ((x)[3]))
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typedef struct dnsType
{
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uint16_t type;
uint16_t class;
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} dnsType;
typedef struct dnsRType
{
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uint16_t type; /* &0 */
uint16_t class; /* &2 */
uint32_t ttl; /* &4 */
uint16_t rdlength; /* &8 */
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} dnsRType;
#define DNS_QUERY 1
#define DNS_TYPE_A 1
#define DNS_CLASS_IN 1
#define DNS_TYPE_NS 2
#define DNS_TYPE_CNAME 5
#define QUERY_FLAGS 128
#define MAX_QUESTIONS 16
LS int dnssock = -1;
LS int dnsserver = 0;
#ifdef DEBUG
char *type_textlist[] =
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{ NULL, "A", "NS", "MD", "MF", "CNAME", "SOA", "MB", "MG", "MR", "NULL", "WKS", "PTR", "HINFO", "MINFO", "MX", "TXT", };
Initial Import
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#endif /* DEBUG */
void init_rawdns(void)
{
struct sockaddr_in sai;
if ((dnssock = socket(AF_INET,SOCK_DGRAM,0)) < 0)
return;
memset(&sai,0,sizeof(sai));
sai.sin_addr.s_addr = INADDR_ANY;
sai.sin_family = AF_INET;
if (bind(dnssock,(struct sockaddr*)&sai,sizeof(sai)) < 0)
{
close(dnssock);
dnssock = -1;
return;
}
SockFlags(dnssock);
#ifdef DEBUG
debug("(init_rawdns) {%i} dnssock is active\n",dnssock);
#endif /* DEBUG */
}
struct in_addr dnsroot_lookup(const char *hostname)
{
dnsAuthority *da;
struct in_addr ip;
for(da=dnsroot;da;da=da->next)
{
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if (!stringcasecmp(hostname,da->hostname))
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{
#ifdef DEBUG
debug("(dnsroot_lookup) %s = %s\n",hostname,inet_ntoa(da->ip));
#endif /* DEBUG */
return(da->ip);
}
}
ip.s_addr = -1;
return(ip);
}
const char *get_dns_token(const char *src, const char *packet, char *dst, int sz)
{
const char *endsrc = NULL;
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uint16_t offptr;
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int tsz;
int dot = 0;
for(;;dot=1)
{
tsz = (uchar)*(src++);
if ((tsz & 0xC0) == 0xC0)
{
offptr = (tsz & 0x3f) << 8;
offptr |= *src;
if ((packet + offptr) > (packet + sz))
return(src+1);
if (!endsrc)
endsrc = src + 1;
src = packet + offptr;
tsz = *(src++);
}
if (tsz == 0)
break;
if (dot)
*(dst++) = '.';
while(tsz)
{
tsz--;
*(dst++) = *(src++);
}
}
*dst = 0;
return((endsrc) ? endsrc : src);
}
int make_query(char *packet, const char *hostname)
{
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dnsQuery *h;
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char *size,*dst;
/*
* make a packet
*/
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memset(packet,0,12);
h = (dnsQuery*)packet;
h->qid = rand() & 0xffff;
h->flags = htons(0x0100);; // Query = 0, Recursion Desired = 1
h->questions = htons(1);
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size = packet + 12;
dst = size + 1;
while(*hostname)
{
if ((*dst = *hostname) == '.')
{
*size = (dst - size - 1);
size = dst;
}
hostname++;
dst++;
}
*size = (dst - size - 1);
dst[0] = 0;
dst[1] = 0;
dst[2] = 1;
dst[3] = 0;
dst[4] = 1;
return(dst - packet + 5);
}
#ifndef UNALIGNED_MEM
struct in_addr temp_ip_data;
struct in_addr *get_stored_ip(const char *ipdata)
{
memcpy((char *)&temp_ip_data,ipdata,4);
return(&temp_ip_data);
}
#else
#define get_stored_ip(x) ((struct in_addr *)x)
#endif /* UNALIGNED_MEM */
/*
*
*/
#ifdef SCRIPTING
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void dns_hook(char *host, char *resolved)
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{
Hook *hook;
Mech *backbot;
backbot = current;
for(hook=hooklist;hook;hook=hook->next)
{
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if (hook->flags == MEV_DNSRESULT && !stringcasecmp(host,hook->type.host))
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{
for(current=botlist;current;current=current->next)
{
if (hook->guid == 0 || hook->guid == current->guid)
{
hook->func(hook->type.host,resolved,hook);
}
}
}
}
current = backbot;
}
#endif /* SCRIPTING */
void parse_query(int psz, dnsQuery *query)
{
struct sockaddr_in sai;
char packet[512];
Mech *backupbot;
struct in_addr *ip;
dnsList *dns;
const char *src,*rtyp;
char token[64],token2[64];
int sz,n;
src = (const char*)query;
#ifdef DEBUG
for(n=0;n<16;n++)
token[n] = (ntohs(query->flags) & (1<<n)) ? '1' : '0';
token[16] = 0;
n = ntohs(query->flags);
debug("(parse_query) %i: flags = %i { %s %i %s%s%s%s%s }\n",
sz,n,token,
(n&15), // result code
(n&32768) ? "QR 1 (Answer) ":"QR 0 (Question) ",
(n&1024) ? "AA ":"",
(n&512) ? "TC ":"",
(n&256)? "RD ":"",
(n&128)? "RA ":"");
#endif /* DEBUG */
src += 12;
for(dns=dnslist;dns;dns=dns->next)
{
if (dns->id == ntohs(query->qid))
break;
}
if (!dns)
return;
n = ntohs(query->questions);
while(n--)
{
/* skip QNAME */
src = get_dns_token(src,(const char *)query,token,psz);
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/* skip (uint16_t)QTYPE and (uint16_t)QCLASS */
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src += 4;
}
n = ntohs(query->answers);
while(n)
{
src = get_dns_token(src,(const char*)query,token,psz);
rtyp = src;
src += 10;
#ifdef DEBUG
debug("(parse_query) %i: answer = %s\n",dns->id,token);
#endif /* DEBUG */
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if ((unpack_uint16_t(&rtyp[0]) == DNS_TYPE_CNAME) &&
(unpack_uint16_t(&rtyp[2]) == DNS_CLASS_IN))
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{
get_dns_token(src,(const char *)query,token2,psz);
#ifdef DEBUG
debug("(parse_query) %i: cname: %s = %s\n",dns->id,token,token2);
#endif /* DEBUG */
if (dns->cname)
Free((char**)&dns->cname);
dns->when = now + 30;
set_mallocdoer(parse_query);
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dns->cname = stringdup(token2);
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}
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if ((unpack_uint16_t(&rtyp[0]) == DNS_TYPE_A) &&
(unpack_uint16_t(&rtyp[2]) == DNS_CLASS_IN) &&
(unpack_uint16_t(&rtyp[8]) == 4))
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{
ip = get_stored_ip(src);
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if (dns->auth && !stringcasecmp(dns->auth->hostname,token))
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{
dns->auth->ip.s_addr = ip->s_addr;
dns->when = now + 60;
#ifdef DEBUG
debug("(parse_query) a auth: %s = %s\n",token,inet_ntoa(*ip));
#endif /* DEBUG */
}
else
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if (!stringcasecmp(dns->host,token) || (dns->cname && !stringcasecmp(dns->cname,token)))
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{
dns->ip.s_addr = ip->s_addr;
dns->when = now + 3600;
#ifdef DEBUG
debug("(parse_query) a: %s = %s\n",token,inet_ntoa(*ip));
#endif /* DEBUG */
/* a final dns anwer was received */
backupbot = current;
for(current=botlist;current;current=current->next)
{
send_pa(PA_DNS|PA_END,token,"Resolved: %s (%s)",token,inet_ntoa(*ip));
}
#ifdef SCRIPTING
dns_hook(token,inet_ntoa(*ip));
#endif /* SCRIPTING */
current = backupbot;
return;
}
}
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src += unpack_uint16_t(&rtyp[8]);
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n--;
}
n = ntohs(query->authorities);
sz = (n > 1) ? RANDOM(1,n) : 1;
#ifdef DEBUG
if (n)
debug("(parse_query) auth: select %i count %i\n",sz,n);
#endif /* DEBUG */
while(n)
{
src = get_dns_token(src,(const char*)query,token,psz);
rtyp = src;
src += 10;
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if ((unpack_uint16_t(&rtyp[0]) == DNS_TYPE_NS) &&
(unpack_uint16_t(&rtyp[2]) == DNS_CLASS_IN))
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{
dnsAuthority *da;
get_dns_token(src,(const char *)query,token2,psz);
if (sz == n)
{
if (dns->auth == NULL)
{
set_mallocdoer(parse_query);
da = dns->auth = (dnsAuthority*)Calloc(sizeof(dnsAuthority) + strlen(token2));
/* Calloc sets to zero da->ip.s_addr = 0; */
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stringcpy(da->hostname,token2);
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}
else
if (dns->findauth == 1)
{
dns->findauth = 2;
if (dns->auth2)
Free((char**)&dns->auth2);
set_mallocdoer(parse_query);
da = dns->auth2 = (dnsAuthority*)Calloc(sizeof(dnsAuthority) + strlen(token2));
/* Calloc sets to zero da->ip.s_addr = 0; */
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stringcpy(da->hostname,token2);
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#ifdef DEBUG
debug("(parse_query) 2nd auth set: %s\n",token2);
#endif /* DEBUG */
}
}
#ifdef DEBUG
debug("(parse_query) authorities: %s = %s%s\n",token,token2,(sz==n) ? MATCH_ALL : "");
#endif /* DEBUG */
}
#ifdef DEBUG
else
{
debug("(parse_query) DNS TYPE %s(%i), CLASS %i, size %i\n",
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type_textlist[unpack_uint16_t(&rtyp[0])],unpack_uint16_t(&rtyp[0]),
unpack_uint16_t(&rtyp[2]),unpack_uint16_t(&rtyp[8]));
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}
#endif /* DEBUG */
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src += unpack_uint16_t(&rtyp[8]);
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n--;
}
if (dns->findauth >= 1)
dns->findauth = 1;
n = ntohs(query->resources);
while(n)
{
src = get_dns_token(src,(const char*)query,token,psz);
rtyp = src;
src += 10;
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if ( (unpack_uint16_t(&rtyp[0]) == DNS_TYPE_A) &&
(unpack_uint16_t(&rtyp[2]) == DNS_CLASS_IN) &&
(unpack_uint16_t(&rtyp[8]) == 4))
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{
ip = get_stored_ip(src);
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if (dns->auth && !stringcasecmp(dns->auth->hostname,token))
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dns->auth->ip.s_addr = ip->s_addr;
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if (dns->auth2 && !stringcasecmp(dns->auth2->hostname,token))
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dns->auth2->ip.s_addr = ip->s_addr;
#ifdef DEBUG
debug("(parse_query) resources: %s = %s\n",token,inet_ntoa(*ip));
#endif /* DEBUG */
}
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src += unpack_uint16_t(&rtyp[8]);
Initial Import
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n--;
}
if (dns->auth && dns->auth->ip.s_addr == 0)
{
sai.sin_addr = dnsroot_lookup(dns->auth->hostname);
if (sai.sin_addr.s_addr != -1)
dns->auth->ip.s_addr = sai.sin_addr.s_addr;
}
if (dns->auth2 && dns->auth2->ip.s_addr == 0)
{
sai.sin_addr = dnsroot_lookup(dns->auth2->hostname);
if (sai.sin_addr.s_addr != -1)
dns->auth2->ip.s_addr = sai.sin_addr.s_addr;
}
if (dns->auth && dns->auth->ip.s_addr && dns->auth2)
{
Free((char**)&dns->auth2);
dns->findauth = 0;
}
#ifdef DEBUG
debug("> dns->when %lu\n",dns->when);
debug("> dns->ip %s\n",inet_ntoa(dns->ip));
debug("> dns->auth %s : %s (%i)\n",(dns->auth) ? dns->auth->hostname : NULLSTR,
(dns->auth) ? inet_ntoa(dns->auth->ip) : "-",(dns->auth) ? dns->auth->count : 0);
debug("> dns->auth2 %s : %s (%i)\n",(dns->auth2) ? dns->auth2->hostname : NULLSTR,
(dns->auth2) ? inet_ntoa(dns->auth2->ip) : "-",(dns->auth2) ? dns->auth2->count : 0);
debug("> dns->findauth %i\n",dns->findauth);
debug("> dns->id %i\n",dns->id);
debug("> dns->cname %s\n",nullstr(dns->cname));
debug("> dns->host %s\n",dns->host);
#endif /* DEBUG */
src = NULL;
if (dns->auth2)
{
if (dns->auth2->ip.s_addr && dns->auth)
{
src = dns->auth->hostname;
sai.sin_addr.s_addr = dns->auth2->ip.s_addr;
}
else
{
src = dns->auth2->hostname;
sai.sin_addr.s_addr = (ia_ns[dnsserver].s_addr == 0) ? ia_default.s_addr : ia_ns[dnsserver].s_addr;
if (++dns->auth->count >= MAX_QUESTIONS)
{
#ifdef DEBUG
debug("(parse_query) dns->auth->count >= 32, starting over\n");
#endif /* DEBUG */
/* too many questions about who the authorative dns server is, start from scratch */
Free((char**)&dns->auth);
Free((char**)&dns->auth2);
dns->findauth = 0;
src = (dns->cname) ? dns->cname : dns->host;
}
}
}
else
if (dns->auth)
{
if (dns->auth->ip.s_addr)
{
/*
* we know the IP of the authorative NS to ask
*/
src = (dns->cname) ? dns->cname : dns->host;
sai.sin_addr.s_addr = dns->auth->ip.s_addr;
}
else
{
/*
* have to dig up the IP of the NS to ask
*/
dns->findauth = 1;
src = dns->auth->hostname;
sai.sin_addr.s_addr = (ia_ns[dnsserver].s_addr == 0) ? ia_default.s_addr : ia_ns[dnsserver].s_addr;
if (++dns->auth->count >= MAX_QUESTIONS)
{
#ifdef DEBUG
debug("(parse_query) dns->auth->count >= 32, starting over\n");
#endif /* DEBUG */
/* too many questions about who the authorative dns server is, start from scratch */
Free((char**)&dns->auth);
Free((char**)&dns->auth2);
dns->findauth = 0;
src = (dns->cname) ? dns->cname : dns->host;
}
}
}
if (src)
{
dns->id = rand();
#ifdef DEBUG
debug("(parse_query) %i: asking %s who is `%s'\n",dns->id,inet_ntoa(sai.sin_addr),src);
#endif /* DEBUG */
sz = make_query(packet,src);
dns->when = now + 60;
sai.sin_family = AF_INET;
sai.sin_port = htons(53);
((dnsQuery*)packet)->qid = htons(dns->id);
if (sendto(dnssock,packet,sz,0,(struct sockaddr*)&sai,sizeof(sai)) < 0)
{
close(dnssock);
dnssock = -1;
}
}
if (dns->auth && dns->auth->ip.s_addr)
Free((char**)&dns->auth);
if (dns->auth2 && dns->auth2->ip.s_addr)
Free((char**)&dns->auth2);
if (src == NULL && dns->ip.s_addr == 0 && dns->cname && dns->host && dns->auth == NULL && dns->auth2 == NULL)
{
dns->id = rand();
sai.sin_addr.s_addr = (ia_ns[dnsserver].s_addr == 0) ? ia_default.s_addr : ia_ns[dnsserver].s_addr;
#ifdef DEBUG
debug("(parse_query) %i: asking %s who is `%s' (CNAME question)\n",dns->id,inet_ntoa(sai.sin_addr),dns->cname);
#endif /* DEBUG */
sz = make_query(packet,dns->cname);
dns->when = now + 60;
sai.sin_family = AF_INET;
sai.sin_port = htons(53);
((dnsQuery*)packet)->qid = htons(dns->id);
if (sendto(dnssock,packet,sz,0,(struct sockaddr*)&sai,sizeof(sai)) < 0)
{
close(dnssock);
dnssock = -1;
}
}
}
void rawdns(const char *hostname)
{
struct sockaddr_in sai;
dnsQuery *query;
dnsList *item;
char packet[512];
int sz;
if (dnssock == -1)
init_rawdns();
if (dnssock == -1)
return;
sz = make_query(packet,hostname);
query = (dnsQuery*)packet;
set_mallocdoer(rawdns);
item = (dnsList*)Calloc(sizeof(dnsList) + strlen(hostname));
reorganizing
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stringcpy(item->host,hostname);
Initial Import
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item->id = ntohs(query->qid);
item->when = now + 30;
item->next = dnslist;
dnslist = item;
/*
* send the packet
*/
sai.sin_family = AF_INET;
sai.sin_port = htons(53);
sai.sin_addr.s_addr = (ia_ns[dnsserver].s_addr == 0) ? ia_default.s_addr : ia_ns[dnsserver].s_addr;
#ifdef DEBUG
debug("(rawdns) questions %s: %s\n",inet_ntoa(sai.sin_addr),item->host);
#endif /* DEBUG */
dnsserver++;
if (ia_ns[dnsserver].s_addr == 0)
dnsserver = 0;
if (sendto(dnssock,packet,sz,0,(struct sockaddr*)&sai,sizeof(sai)) < 0)
{
close(dnssock);
dnssock = -1;
}
}
void select_rawdns(void)
{
dnsList *dns,**pdns;
if (dnssock != -1)
{
chkhigh(dnssock);
FD_SET(dnssock,&read_fds);
}
restart:
pdns = &dnslist;
while(*pdns)
{
if ((*pdns)->when < now)
{
dns = *pdns;
if (dns->cname)
Free((char**)&dns->cname);
if (dns->auth)
Free((char**)&dns->auth);
if (dns->auth2)
Free((char**)&dns->auth2);
#ifdef DEBUG
debug("(select_rawdns) removing %s qid %i\n",dns->host,dns->id);
#endif /* DEBUG */
for(current=botlist;current;current=current->next)
{
send_pa(PA_DNS|PA_END,dns->host,"Unable to resolve %s",dns->host);
}
#ifdef SCRIPTING
dns_hook(dns->host,"~");
#endif /* SCRIPTING */
*pdns = dns->next;
Free((char**)&dns);
goto restart;
}
pdns = &(*pdns)->next;
}
}
void process_rawdns(void)
{
struct sockaddr_in sai;
char packet[512];
int sz,n;
if (dnssock == -1)
return;
if (FD_ISSET(dnssock,&read_fds))
{
sz = sizeof(sai);
n = recvfrom(dnssock,packet,512,0,(struct sockaddr*)&sai,&sz);
if (n < sizeof(dnsQuery))
return;
#ifdef DEBUG
debug("(process_rawdns) packet from: %s (%i bytes)\n",inet_ntoa(sai.sin_addr),n);
#endif /* DEBUG */
parse_query(n,(dnsQuery*)packet);
}
}
char *poll_rawdns(char *hostname)
{
dnsList *dns;
for(dns=dnslist;dns;dns=dns->next)
{
reorganizing
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if (dns->ip.s_addr && !stringcasecmp(dns->host,hostname))
Initial Import
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{
#ifdef DEBUG
debug("(poll_rawdns) a: %s ==> %s\n",hostname,inet_ntoa(dns->ip));
#endif /* DEBUG */
return(inet_ntoa(dns->ip));
}
}
return(NULL);
}
LS int backup_debug;
int read_dnsroot(char *line)
{
struct in_addr ia;
dnsAuthority *da;
char *name,*a,*ip,*src;
name = chop(&line);
a = chop(&line); /* TTL is optional */
reorganizing
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if (a && stringcmp(a,"A"))
Initial Import
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a = chop(&line);
ip = chop(&line);
reorganizing
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if (a && !stringcmp(a,"A") && ip && inet_aton(ip,&ia) != 0)
Initial Import
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{
/* remove trailing dot */
for(src=name;*src;)
{
if (*src == '.' && *(src+1) == 0)
*src = 0;
else
src++;
}
set_mallocdoer(read_dnsroot);
da = (dnsAuthority*)Calloc(sizeof(dnsAuthority) + strlen(name));
reorganizing
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stringcpy(da->hostname,name);
Initial Import
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da->ip.s_addr = ia.s_addr;
da->next = dnsroot;
dnsroot = da;
#ifdef DEBUG
dodebug = backup_debug;
debug("(read_dnsroot) stored root IP: %s = %s\n",name,ip);
dodebug = 0;
#endif /* DEBUG */
}
return(FALSE);
}
/*
* find the IP quickly
*/
reorganizing3
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uint32_t rawdns_get_ip(const char *host)
Initial Import
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{
reorganizing3
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uint32_t ip;
Initial Import
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if ((ip = inet_addr(host)) == INADDR_NONE)
{
}
#ifdef DEBUG
debug("(rawdns_get_ip) %s -> %s\n",host,inet_ntoa(*((struct in_addr*)&ip)));
#endif /* DEBUG */
return(ip);
}
/*
*
* commands related to DNS
*
*/
void do_dnsroot(COMMAND_ARGS)
{
int in;
if ((in = open(rest,O_RDONLY)) >= 0)
{
#ifdef SESSION
Strp *p;
p = (Strp*)Calloc(strlen(rest)+1);
p->next = dnsrootfiles;
reorganizing
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stringcpy(p->p,rest);
Initial Import
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dnsrootfiles = p;
#endif /* SESSION */
#ifdef DEBUG
backup_debug = dodebug;
dodebug = 0;
#endif /* DEBUG*/
readline(in,&read_dnsroot); /* readline closes in */
#ifdef DEBUG
dodebug = backup_debug;
#endif /* DEBUG */
}
}
void do_dnsserver(COMMAND_ARGS)
{
/*
* on_msg checks: GAXS
*/
struct in_addr ia;
char *p,c,tempservers[MAX_NAMESERVERS*16+3];
/* (xxx.yyy.zzz.www + 1 space * MAX_NAMESERVERS) + 1 terminator char + 2 chars bold font */
int i;
if (!*rest)
{
*(p = tempservers) = 0;
for(i=0;i<MAX_NAMESERVERS;i++)
{
if (ia_ns[i].s_addr > 0)
{
if (i == dnsserver)
{
sprintf(p,"\037%s\037 ",inet_ntoa(ia_ns[i]));
p = STREND(p);
}
else
{
reorganizing
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p = stringcpy(p,inet_ntoa(ia_ns[i]));
Initial Import
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*(p++) = ' ';
*p = 0;
}
}
}
if (*tempservers == 0)
reorganizing
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stringcpy(tempservers,"\037127.0.0.1\037");
Initial Import
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to_user(from,"Current DNS Servers: %s",tempservers);
return;
}
c = *(rest++);
if ((ia.s_addr = inet_addr(rest)) == INADDR_NONE)
c = 0;
switch(c)
{
case '+':
for(i=0;i<MAX_NAMESERVERS;i++)
{
if (ia_ns[i].s_addr == 0)
{
ia_ns[i].s_addr = ia.s_addr;
to_user(from,"DNS Server added: %s",rest);
return;
}
}
to_user(from,"No free DNS Server slots found, remove one before adding new servers");
return;
case '-':
for(i=0;i<MAX_NAMESERVERS;i++)
{
if (ia_ns[i].s_addr == ia.s_addr || ia.s_addr == 0)
{
ia_ns[i].s_addr = 0;
}
}
for(i=1;i<MAX_NAMESERVERS;i++)
{
if (ia_ns[i-1].s_addr == 0)
{
ia_ns[i-1].s_addr = ia_ns[i].s_addr;
ia_ns[i].s_addr = 0;
}
}
dnsserver = 0;
if (ia.s_addr > 0)
to_user(from,"DNS Server removed: %s",rest);
else
to_user(from,"All known DNS Servers removed.");
return;
default:
usage(from);
}
}
/*
* resolve the dns of a user/host
* usage: DNS <nick|host>
*/
void do_dns(COMMAND_ARGS)
{
/*
* on_msg checks: CARGS and GAXS
*/
char *host,*res,*src,*dst,*dot;
reorganizing3
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uint32_t ip;
Initial Import
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/* to date, all hostnames contain atleast one dot */
if ((STRCHR(rest,'.')))
{
host = rest;
}
else
{
/* no dots, try to find it as a nick */
/* searches all channels and nicks, clobbers get_nuh */
if ((host = find_nuh(rest)) == NULL)
{
to_user(from,"Unable to resolve %s: unknown nick/host",rest);
return;
}
while(*host && *host != '@')
host++;
if (*host == '@')
host++;
#ifdef DEBUG
debug("(do_dns) %s is on host %s\n",rest,host);
#endif /* DEBUG */
}
if ((ip = inet_addr(host)) != INADDR_NONE)
{
/* flip an IP backwards to resolve hostname */
// a11.b22.c33.d44
// d44.c33.b22.a11.in-addr.arpa
myconfig, configure option testing and fixing, monitor_fs()
2018-04-15 03:57:44 +02:00
dst = globaldata;
Initial Import
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flipstep:
src = host;
dot = NULL;
while(*src)
{
if (*src == '.')
dot = src;
src++;
}
if (dot)
{
*dot++ = 0; // safe to modify buffer?
while(*dot)
*dst++ = *dot++;
*dst++ = '.';
goto flipstep;
}
reorganizing
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stringcpy(stringcpy(dst,host),".in-addr.arpa");
Initial Import
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#ifdef DEBUG
myconfig, configure option testing and fixing, monitor_fs()
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debug("(do_dns) host flipped to %s\n",globaldata);
Initial Import
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#endif /* DEBUG */
myconfig, configure option testing and fixing, monitor_fs()
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host = globaldata;
Initial Import
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}
/* check if its in cache now */
if ((res = poll_rawdns(host)))
{
//Resolved: irc.dal.net (194.68.45.50)
send_pa(PA_DNS|PA_END,NULL,"Resolved: %s (%s)",host,res);
return;
}
march 9-10
2018-03-10 02:55:07 +01:00
if (to && *to == '#')
make_ireq(PA_DNS,to,host);
else
make_ireq(PA_DNS,from,host);
Initial Import
2014-03-08 19:56:21 -05:00
rawdns(host);
}
#endif /* RAWDNS */
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