/*
-dns.cpp - based on the dns library Copyright (C) 2002 Ian Gulliver
+dns.cpp - based on the firedns library Copyright (C) 2002 Ian Gulliver
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as
#define _DNS_C
+using namespace std;
+
#include <string>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
#include "dns.h"
+#include "helperfuncs.h"
-static const char tagstring[] = "$Id$";
+extern int statsAccept,statsRefused,statsUnknown,statsCollisions,statsDns,statsDnsGood,statsDnsBad,statsConnects,statsSent,statsRecv;
#define max(a,b) (a > b ? a : b)
#define DNS_MAX 8 /* max number of nameservers used */
unsigned char payload[512]; /* DNS question, populated by dns_build_query_payload() */
};
+extern time_t TIME;
+
void *dns_align(void *inp) {
char *p = (char*)inp;
int offby = ((char *)p - (char *)0) % DNS_ALIGN;
i4 = 0;
initdone = 1;
- srand((unsigned int) time(NULL));
+ srand((unsigned int) TIME);
memset(servers4,'\0',sizeof(in_addr) * DNS_MAX);
f = fopen(DNS_CONFIG_FBCK,"r");
if (f == NULL)
}
}
fclose(f);
-
}
-void DNS::dns_init_2(const char* dnsserver) { /* populates servers4 struct with address from the given parameter */
- FILE *f;
- int i;
+void DNS::dns_init_2(const char* dnsserver)
+{
in_addr addr4;
- char buf[1024];
- if (initdone == 1)
- return;
i4 = 0;
-
- initdone = 1;
- srand((unsigned int) time(NULL));
+ srand((unsigned int) TIME);
memset(servers4,'\0',sizeof(in_addr) * DNS_MAX);
if (dns_aton4_s(dnsserver,&addr4) != NULL)
memcpy(&servers4[i4++],&addr4,sizeof(in_addr));
}
-static int dns_send_requests(const s_header *h, const s_connection *s, const int l) { /* send DNS query */
+static int dns_send_requests(const s_header *h, const s_connection *s, const int l)
+{
int i;
sockaddr_in addr4;
unsigned char payload[sizeof(s_header)];
dns_empty_header(payload,h,l);
- for (i = 0; i < i4; i++) {
- /* otherwise send via standard ipv4 boringness */
- memset(&addr4,0,sizeof(addr4));
- memcpy(&addr4.sin_addr,&servers4[i],sizeof(addr4.sin_addr));
- addr4.sin_family = AF_INET;
- addr4.sin_port = htons(DNS_PORT);
- if (sendto(s->fd, payload, l + 12, 0, (sockaddr *) &addr4, sizeof(addr4)) == -1)
- {
- return -1;
- }
+ i = 0;
+
+ /* otherwise send via standard ipv4 boringness */
+ memset(&addr4,0,sizeof(addr4));
+ memcpy(&addr4.sin_addr,&servers4[i],sizeof(addr4.sin_addr));
+ addr4.sin_family = AF_INET;
+ addr4.sin_port = htons(DNS_PORT);
+ if (sendto(s->fd, payload, l + 12, 0, (sockaddr *) &addr4, sizeof(addr4)) == -1)
+ {
+ return -1;
}
return 0;
}
in_addr* DNS::dns_aton4(const char * const ipstring) { /* ascii to numeric: convert string to static 4part IP addr struct */
- in_addr ip;
+ static in_addr ip;
return dns_aton4_s(ipstring,&ip);
}
}
in_addr* DNS::dns_aton4_s(const char *ipstring, in_addr *ip) { /* ascii to numeric (buffered): convert string to given 4part IP addr struct */
- unsigned char *myip;
- int i,part = 0;
- myip = (unsigned char *)ip;
-
- memset(myip,'\0',4);
- for (i = 0; i < 16; i++) {
- switch (ipstring[i]) {
- case '\0':
- if (part != 3)
- return NULL;
- return ip;
- break;
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- if (myip[part] > 25)
- return NULL;
- myip[part] *= 10;
- if (myip[part] == 250 && ipstring[i] - '0' > 6)
- return NULL;
- myip[part] += ipstring[i] - '0';
- break;
- case '.':
- if (part == 3)
- return ip;
- else
- part++;
- break;
- default:
- if (part == 3)
- return ip;
- else
- return NULL;
- break;
- }
- }
- if (part == 3)
- return ip;
- else
- return NULL;
+ inet_aton(ipstring,ip);
+ return ip;
}
int DNS::dns_getip4(const char *name) { /* build, add and send A query; retrieve result with dns_getresult() */
unsigned char *c;
int l;
- dns_init();
-
c = (unsigned char *)&ip->s_addr;
sprintf(query,"%d.%d.%d.%d.in-addr.arpa",c[3],c[2],c[1],c[0]);
}
char* DNS::dns_ntoa4(const in_addr * const ip) { /* numeric to ascii: convert 4part IP addr struct to static string */
- static char result[256];
- return dns_ntoa4_s(ip,result);
+ static char r[256];
+ return dns_ntoa4_s(ip,r);
}
char* DNS::dns_ntoa4_r(const in_addr *ip) { /* numeric to ascii (reentrant): convert 4part IP addr struct to new string */
- char *result;
- result = new char[256];
- return dns_ntoa4_s(ip,result);
+ char *r;
+ r = new char[256];
+ return dns_ntoa4_s(ip,r);
}
-char* DNS::dns_ntoa4_s(const in_addr *ip, char *result) { /* numeric to ascii (buffered): convert 4part IP addr struct to given string */
+char* DNS::dns_ntoa4_s(const in_addr *ip, char *r) { /* numeric to ascii (buffered): convert 4part IP addr struct to given string */
unsigned char *m;
m = (unsigned char *)&ip->s_addr;
- sprintf(result,"%d.%d.%d.%d",m[0],m[1],m[2],m[3]);
- return result;
+ sprintf(r,"%d.%d.%d.%d",m[0],m[1],m[2],m[3]);
+ return r;
}
-char* DNS::dns_getresult(const int fd) { /* retrieve result of DNS query */
- static char result[RESULTSIZE];
- return dns_getresult_s(fd,result);
+char* DNS::dns_getresult(const int cfd) { /* retrieve result of DNS query */
+ static char r[RESULTSIZE];
+ return dns_getresult_s(cfd,r);
}
-char* DNS::dns_getresult_r(const int fd) { /* retrieve result of DNS query (reentrant) */
- char *result;
- result = new char[RESULTSIZE];
- if(dns_getresult_s(fd,result) == NULL) {
- delete result;
+char* DNS::dns_getresult_r(const int cfd) { /* retrieve result of DNS query (reentrant) */
+ char *r;
+ r = new char[RESULTSIZE];
+ if(dns_getresult_s(cfd,r) == NULL) {
+ delete r;
return NULL;
}
- return result;
+ return r;
}
-char* DNS::dns_getresult_s(const int fd, char *result) { /* retrieve result of DNS query (buffered) */
+char* DNS::dns_getresult_s(const int cfd, char *res) { /* retrieve result of DNS query (buffered) */
s_header h;
s_connection *c, *prev;
int l,i,q,curanswer,o;
unsigned char buffer[sizeof(s_header)];
unsigned short p;
- if (result)
+ if (res)
{
- result[0] = 0;
+ res[0] = 0;
}
prev = NULL;
c = connection_head;
while (c != NULL) { /* find query in list of open queries */
- if (c->fd == fd)
+ if (c->fd == cfd)
break;
prev = c;
c = c->next;
if (h.payload[i] == 0)
q = 1;
else {
- result[o] = '\0';
+ res[o] = '\0';
if (o != 0)
- result[o++] = '.';
- memcpy(&result[o],&h.payload[i + 1],h.payload[i]);
+ res[o++] = '.';
+ memcpy(&res[o],&h.payload[i + 1],h.payload[i]);
o += h.payload[i];
i += h.payload[i] + 1;
}
}
}
- result[o] = '\0';
+ res[o] = '\0';
break;
case DNS_QRY_A:
if (c->want_list) {
- dns_ip4list *alist = (dns_ip4list *) result; /* we have to trust that this is aligned */
- while ((char *)alist - (char *)result < 700) {
+ dns_ip4list *alist = (dns_ip4list *) res; /* we have to trust that this is aligned */
+ while ((char *)alist - (char *)res < 700) {
if (rr.type != DNS_QRY_A)
break;
if (rr._class != 1)
break;
default:
defaultcase:
- memcpy(result,&h.payload[i],rr.rdlength);
- result[rr.rdlength] = '\0';
+ memcpy(res,&h.payload[i],rr.rdlength);
+ res[rr.rdlength] = '\0';
break;
}
delete c;
- return result;
+ return res;
}
DNS::DNS()
dns_init_2(dnsserver.c_str());
}
+void DNS::SetNS(std::string dnsserver)
+{
+ dns_init_2(dnsserver.c_str());
+}
+
DNS::~DNS()
{
}
bool DNS::ReverseLookup(std::string ip)
{
+ statsDns++;
binip = dns_aton4(ip.c_str());
if (binip == NULL) {
return false;
}
+
this->fd = dns_getname4(binip);
if (this->fd == -1)
+ {
return false;
+ }
return true;
}
{
result = dns_getresult(this->fd);
if (result) {
+ statsDnsGood++;
+ dns_close(this->fd);
return result;
} else {
+ statsDnsBad++;
return "";
}
}
projects / user / henk / code / inspircd.git / blobdiff