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-rw-r--r--src/dns.cpp1422
1 files changed, 548 insertions, 874 deletions
diff --git a/src/dns.cpp b/src/dns.cpp
index eee1e0234..a8268aafc 100644
--- a/src/dns.cpp
+++ b/src/dns.cpp
@@ -3,13 +3,13 @@
* +------------------------------------+
*
* InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
- * E-mail:
- * <brain@chatspike.net>
- * <Craig@chatspike.net>
+ * E-mail:
+ * <brain@chatspike.net>
+ * <Craig@chatspike.net>
*
* Written by Craig Edwards, Craig McLure, and others.
* This program is free but copyrighted software; see
- * the file COPYING for details.
+ * the file COPYING for details.
*
* ---------------------------------------------------
*/
@@ -53,10 +53,6 @@ using namespace std;
#include "socketengine.h"
#include "configreader.h"
-#ifdef THREADED_DNS
-pthread_mutex_t connmap_lock = PTHREAD_MUTEX_INITIALIZER;
-#endif
-
extern InspIRCd* ServerInstance;
extern ServerConfig* Config;
extern time_t TIME;
@@ -70,56 +66,70 @@ class s_connection;
typedef std::map<int,s_connection*> connlist;
typedef connlist::iterator connlist_iter;
+
+DNS* Res = NULL;
+
+/* As lookups are completed, they are pushed into this result_list */
+std::map<int, std::string> result_list;
connlist connections;
-Resolver* dns_classes[MAX_DESCRIPTORS];
+int master_socket = -1;
+
+Resolver* dns_classes[65536];
insp_inaddr servers[8];
int i4;
-int initdone = 0;
-int lastcreate = -1;
-class s_connection
+class s_rr_middle
{
public:
- unsigned char id[2];
- unsigned int _class;
- QueryType type;
- int want_list;
- int fd;
+ QueryType type;
+ unsigned int _class;
+ unsigned long ttl;
+ unsigned int rdlength;
};
-class s_rr_middle
+class s_header
{
public:
- QueryType type;
- unsigned int _class;
- unsigned long ttl;
- unsigned int rdlength;
+ unsigned char id[2];
+ unsigned int flags1;
+ unsigned int flags2;
+ unsigned int qdcount;
+ unsigned int ancount;
+ unsigned int nscount;
+ unsigned int arcount;
+ unsigned char payload[512];
};
-class s_header
+class s_connection
{
public:
- unsigned char id[2];
- unsigned int flags1;
- unsigned int flags2;
- unsigned int qdcount;
- unsigned int ancount;
- unsigned int nscount;
- unsigned int arcount;
- unsigned char payload[512];
+ unsigned char id[2];
+ unsigned char res[512];
+ unsigned int _class;
+ QueryType type;
+ int want_list;
+
+ s_connection()
+ {
+ *res = 0;
+ }
+
+ unsigned char* result_ready(s_header &h, int length);
+ int send_requests(const s_header *h, const int l);
};
+
void *dns_align(void *inp)
{
- char *p = (char*)inp;
- int offby = ((char *)p - (char *)0) % (sizeof(void *) > sizeof(long) ? sizeof(void *) : sizeof(long));
- if (offby != 0)
- return p + ((sizeof(void *) > sizeof(long) ? sizeof(void *) : sizeof(long)) - offby);
- else
- return p;
+ char *p = (char*)inp;
+ int offby = ((char *)p - (char *)0) % (sizeof(void *) > sizeof(long) ? sizeof(void *) : sizeof(long));
+ if (offby != 0)
+ return p + ((sizeof(void *) > sizeof(long) ? sizeof(void *) : sizeof(long)) - offby);
+ else
+ return p;
}
/*
@@ -131,352 +141,266 @@ void *dns_align(void *inp)
inline void dns_fill_rr(s_rr_middle* rr, const unsigned char *input)
{
- rr->type = (QueryType)((input[0] << 8) + input[1]);
- rr->_class = (input[2] << 8) + input[3];
- rr->ttl = (input[4] << 24) + (input[5] << 16) + (input[6] << 8) + input[7];
- rr->rdlength = (input[8] << 8) + input[9];
+ rr->type = (QueryType)((input[0] << 8) + input[1]);
+ rr->_class = (input[2] << 8) + input[3];
+ rr->ttl = (input[4] << 24) + (input[5] << 16) + (input[6] << 8) + input[7];
+ rr->rdlength = (input[8] << 8) + input[9];
}
inline void dns_fill_header(s_header *header, const unsigned char *input, const int l)
{
- header->id[0] = input[0];
- header->id[1] = input[1];
- header->flags1 = input[2];
- header->flags2 = input[3];
- header->qdcount = (input[4] << 8) + input[5];
- header->ancount = (input[6] << 8) + input[7];
- header->nscount = (input[8] << 8) + input[9];
- header->arcount = (input[10] << 8) + input[11];
- memcpy(header->payload,&input[12],l);
+ header->id[0] = input[0];
+ header->id[1] = input[1];
+ header->flags1 = input[2];
+ header->flags2 = input[3];
+ header->qdcount = (input[4] << 8) + input[5];
+ header->ancount = (input[6] << 8) + input[7];
+ header->nscount = (input[8] << 8) + input[9];
+ header->arcount = (input[10] << 8) + input[11];
+ memcpy(header->payload,&input[12],l);
}
inline void dns_empty_header(unsigned char *output, const s_header *header, const int l)
{
- output[0] = header->id[0];
- output[1] = header->id[1];
- output[2] = header->flags1;
- output[3] = header->flags2;
- output[4] = header->qdcount >> 8;
- output[5] = header->qdcount & 0xFF;
- output[6] = header->ancount >> 8;
- output[7] = header->ancount & 0xFF;
- output[8] = header->nscount >> 8;
- output[9] = header->nscount & 0xFF;
- output[10] = header->arcount >> 8;
- output[11] = header->arcount & 0xFF;
- memcpy(&output[12],header->payload,l);
+ output[0] = header->id[0];
+ output[1] = header->id[1];
+ output[2] = header->flags1;
+ output[3] = header->flags2;
+ output[4] = header->qdcount >> 8;
+ output[5] = header->qdcount & 0xFF;
+ output[6] = header->ancount >> 8;
+ output[7] = header->ancount & 0xFF;
+ output[8] = header->nscount >> 8;
+ output[9] = header->nscount & 0xFF;
+ output[10] = header->arcount >> 8;
+ output[11] = header->arcount & 0xFF;
+ memcpy(&output[12],header->payload,l);
}
-void dns_close(int fd)
-{
-#ifndef THREADED_DNS
- if (ServerInstance && ServerInstance->SE)
- ServerInstance->SE->DelFd(fd);
-#endif
- log(DEBUG,"DNS: dns_close on fd %d",fd);
- shutdown(fd,2);
- close(fd);
- return;
-}
-void DNS::dns_init()
+int s_connection::send_requests(const s_header *h, const int l)
{
- FILE *f;
- int i;
- insp_inaddr addr;
- char buf[1024];
- if (initdone == 1)
- return;
- i4 = 0;
-
- initdone = 1;
- srand((unsigned int) TIME);
- memset(servers,'\0',sizeof(insp_inaddr) * 8);
- f = fopen("/etc/resolv.conf","r");
- if (f == NULL)
- return;
- while (fgets(buf,1024,f) != NULL) {
- if (strncmp(buf,"nameserver",10) == 0)
- {
- i = 10;
- while (buf[i] == ' ' || buf[i] == '\t')
- i++;
- if (i4 < 8)
- {
- if (insp_aton(&buf[i],&addr) > 0)
- {
- log(DEBUG,"Add server %d, %s",i4,&buf[i]);
- memcpy(&servers[i4++],&addr,sizeof(insp_inaddr));
- }
- }
- }
- }
- fclose(f);
-}
+ insp_sockaddr addr;
+ unsigned char payload[sizeof(s_header)];
-void DNS::dns_init_2(const char* dnsserver)
-{
- log(DEBUG,"*************** DNS INIT 2 **************");
- insp_inaddr addr;
- i4 = 0;
- srand((unsigned int) TIME);
- memset(servers,'\0',sizeof(insp_inaddr) * 8);
- log(DEBUG,"ADD DNS: %s",dnsserver);
- if (insp_aton(dnsserver,&addr) > 0)
+ dns_empty_header(payload,h,l);
+
+ /* otherwise send via standard ipv4 boringness */
+ memset(&addr,0,sizeof(addr));
+#ifdef IPV6
+ memcpy(&addr.sin6_addr,&servers[0],sizeof(addr.sin6_addr));
+ addr.sin6_family = AF_FAMILY;
+ addr.sin6_port = htons(53);
+#else
+ memcpy(&addr.sin_addr.s_addr,&servers[0],sizeof(addr.sin_addr));
+ addr.sin_family = AF_FAMILY;
+ addr.sin_port = htons(53);
+#endif
+ if (sendto(master_socket, payload, l + 12, 0, (sockaddr *) &addr, sizeof(addr)) == -1)
{
- unsigned char* n = (unsigned char*)&addr;
- log(DEBUG,"***** Add server %d, %s: %d, %d, %d, %d",i4,dnsserver,n[0],n[1],n[2],n[3]);
- memcpy(&servers[i4++],&addr,sizeof(insp_inaddr));
+ log(DEBUG,"Error in sendto!");
+ return -1;
}
-}
+ return 0;
+}
-int dns_send_requests(const s_header *h, const s_connection *s, const int l)
+s_connection* dns_add_query(s_header *h, int &id)
{
- int i;
- insp_sockaddr addr;
- unsigned char payload[sizeof(s_header)];
- dns_empty_header(payload,h,l);
+ id = rand() % 65536;
+ s_connection * s = new s_connection();
-
- i = 0;
-
- /* otherwise send via standard ipv4 boringness */
- memset(&addr,0,sizeof(addr));
-#ifdef IPV6
- memcpy(&addr.sin6_addr,&servers[i],sizeof(addr.sin6_addr));
- addr.sin6_family = AF_FAMILY;
- addr.sin6_port = htons(53);
-#else
- memcpy(&addr.sin_addr.s_addr,&servers[i],sizeof(addr.sin_addr));
- addr.sin_family = AF_FAMILY;
- addr.sin_port = htons(53);
-#endif
- if (sendto(s->fd, payload, l + 12, 0, (sockaddr *) &addr, sizeof(addr)) == -1)
- {
- log(DEBUG,"Error in sendto!");
- return -1;
- }
-
- return 0;
+ /* set header flags */
+ h->id[0] = s->id[0] = id >> 8;
+ h->id[1] = s->id[1] = id & 0xFF;
+ h->flags1 = 0 | FLAGS1_MASK_RD;
+ h->flags2 = 0;
+ h->qdcount = 1;
+ h->ancount = 0;
+ h->nscount = 0;
+ h->arcount = 0;
+ s->want_list = 0;
+ if (connections.find(id) == connections.end())
+ connections[id] = s;
+ return s;
}
-s_connection *dns_add_query(s_header *h)
+void create_socket()
{
+ log(DEBUG,"---- BEGIN DNS INITIALIZATION, SERVER=%s ---",Config->DNSServer);
+ insp_inaddr addr;
+ i4 = 0;
+ srand((unsigned int) TIME);
+ memset(servers,'\0',sizeof(insp_inaddr) * 8);
+ if (insp_aton(Config->DNSServer,&addr) > 0)
+ memcpy(&servers[i4++],&addr,sizeof(insp_inaddr));
- s_connection * s = new s_connection;
- int id = rand() % 65536;
-
- /* set header flags */
- h->id[0] = s->id[0] = id >> 8; /* verified by dns_getresult_s() */
- h->id[1] = s->id[1] = id & 0xFF;
- h->flags1 = 0 | FLAGS1_MASK_RD;
- h->flags2 = 0;
- h->qdcount = 1;
- h->ancount = 0;
- h->nscount = 0;
- h->arcount = 0;
- s->want_list = 0;
- s->fd = socket(PF_PROTOCOL, SOCK_DGRAM, 0);
- if (s->fd != -1)
- {
- log(DEBUG,"Set query socket nonblock");
- if (fcntl(s->fd, F_SETFL, O_NONBLOCK) != 0)
- {
- shutdown(s->fd,2);
- close(s->fd);
- s->fd = -1;
- }
- }
- if (s->fd != -1)
- {
+ master_socket = socket(PF_PROTOCOL, SOCK_DGRAM, 0);
+ if (master_socket != -1)
+ {
+ log(DEBUG,"Set query socket nonblock");
+ if (fcntl(master_socket, F_SETFL, O_NONBLOCK) != 0)
+ {
+ shutdown(master_socket,2);
+ close(master_socket);
+ master_socket = -1;
+ }
+ }
+ if (master_socket != -1)
+ {
#ifdef IPV6
- insp_sockaddr addr;
- memset(&addr,0,sizeof(addr));
- addr.sin6_family = AF_FAMILY;
- addr.sin6_port = 0;
- memset(&addr.sin6_addr,255,sizeof(in6_addr));
+ insp_sockaddr addr;
+ memset(&addr,0,sizeof(addr));
+ addr.sin6_family = AF_FAMILY;
+ addr.sin6_port = 0;
+ memset(&addr.sin6_addr,255,sizeof(in6_addr));
#else
- insp_sockaddr addr;
- memset(&addr,0,sizeof(addr));
- addr.sin_family = AF_FAMILY;
- addr.sin_port = 0;
- addr.sin_addr.s_addr = INADDR_ANY;
- if (bind(s->fd,(sockaddr *)&addr,sizeof(addr)) != 0)
- {
- log(DEBUG,"Cant bind with source port = 0");
- shutdown(s->fd,2);
- close(s->fd);
- s->fd = -1;
- }
+ insp_sockaddr addr;
+ memset(&addr,0,sizeof(addr));
+ addr.sin_family = AF_FAMILY;
+ addr.sin_port = 0;
+ addr.sin_addr.s_addr = INADDR_ANY;
#endif
- }
- if (s->fd == -1)
- {
- DELETE(s);
- return NULL;
- }
- /* create new connection object, add to linked list */
-#ifdef THREADED_DNS
- pthread_mutex_lock(&connmap_lock);
-#endif
- if (connections.find(s->fd) == connections.end())
- connections[s->fd] = s;
-#ifdef THREADED_DNS
- pthread_mutex_unlock(&connmap_lock);
-#endif
-
- return s;
+ log(DEBUG,"Binding query port");
+ if (bind(master_socket,(sockaddr *)&addr,sizeof(addr)) != 0)
+ {
+ log(DEBUG,"Cant bind with source port = 0");
+ shutdown(master_socket,2);
+ close(master_socket);
+ master_socket = -1;
+ }
+
+ if (master_socket >= 0)
+ {
+ log(DEBUG,"Attach query port to socket engine");
+ if (ServerInstance && ServerInstance->SE)
+ ServerInstance->SE->AddFd(master_socket,true,X_ESTAB_DNS);
+ }
+ }
}
int dns_build_query_payload(const char * const name, const unsigned short rr, const unsigned short _class, unsigned char * const payload)
{
- short payloadpos;
- const char * tempchr, * tempchr2;
- unsigned short l;
-
- payloadpos = 0;
- tempchr2 = name;
-
- /* split name up into labels, create query */
- while ((tempchr = strchr(tempchr2,'.')) != NULL)
- {
- l = tempchr - tempchr2;
- if (payloadpos + l + 1 > 507)
- return -1;
- payload[payloadpos++] = l;
- memcpy(&payload[payloadpos],tempchr2,l);
- payloadpos += l;
- tempchr2 = &tempchr[1];
- }
- l = strlen(tempchr2);
- if (l)
- {
- if (payloadpos + l + 2 > 507)
- return -1;
- payload[payloadpos++] = l;
- memcpy(&payload[payloadpos],tempchr2,l);
- payloadpos += l;
- payload[payloadpos++] = '\0';
- }
- if (payloadpos > 508)
- return -1;
- l = htons(rr);
- memcpy(&payload[payloadpos],&l,2);
- l = htons(_class);
- memcpy(&payload[payloadpos + 2],&l,2);
- return payloadpos + 4;
-}
-
-int DNS::dns_getip4(const char *name) { /* build, add and send A query; retrieve result with dns_getresult() */
- s_header h;
- s_connection *s;
- int l;
+ short payloadpos;
+ const char * tempchr, * tempchr2;
+ unsigned short l;
- dns_init();
-
+ payloadpos = 0;
+ tempchr2 = name;
- l = dns_build_query_payload(name,DNS_QRY_A,1,(unsigned char *)&h.payload);
- if (l == -1)
- return -1;
- s = dns_add_query(&h);
- if (s == NULL)
- return -1;
- s->_class = 1;
- s->type = DNS_QRY_A;
- if (dns_send_requests(&h,s,l) == -1)
- return -1;
-
- return s->fd;
-}
-
-int DNS::dns_getip4list(const char *name) { /* build, add and send A query; retrieve result with dns_getresult() */
- s_header h;
- s_connection *s;
- int l;
-
- dns_init();
-
- l = dns_build_query_payload(name,DNS_QRY_A,1,(unsigned char *)&h.payload);
- if (l == -1)
- return -1;
- s = dns_add_query(&h);
- if (s == NULL)
- return -1;
- s->_class = 1;
- s->type = DNS_QRY_A;
- s->want_list = 1;
- if (dns_send_requests(&h,s,l) == -1)
- return -1;
-
- return s->fd;
+ /* split name up into labels, create query */
+ while ((tempchr = strchr(tempchr2,'.')) != NULL)
+ {
+ l = tempchr - tempchr2;
+ if (payloadpos + l + 1 > 507)
+ return -1;
+ payload[payloadpos++] = l;
+ memcpy(&payload[payloadpos],tempchr2,l);
+ payloadpos += l;
+ tempchr2 = &tempchr[1];
+ }
+ l = strlen(tempchr2);
+ if (l)
+ {
+ if (payloadpos + l + 2 > 507)
+ return -1;
+ payload[payloadpos++] = l;
+ memcpy(&payload[payloadpos],tempchr2,l);
+ payloadpos += l;
+ payload[payloadpos++] = '\0';
+ }
+ if (payloadpos > 508)
+ return -1;
+ l = htons(rr);
+ memcpy(&payload[payloadpos],&l,2);
+ l = htons(_class);
+ memcpy(&payload[payloadpos + 2],&l,2);
+ return payloadpos + 4;
+}
+
+int DNS::dns_getip4(const char *name)
+{
+ /* build, add and send A query; retrieve result with dns_getresult() */
+ s_header h;
+ s_connection *s;
+ int l;
+ int id;
+
+ l = dns_build_query_payload(name,DNS_QRY_A,1,(unsigned char *)&h.payload);
+ if (l == -1)
+ return -1;
+ s = dns_add_query(&h, id);
+ if (s == NULL)
+ return -1;
+ s->_class = 1;
+ s->type = DNS_QRY_A;
+ if (s->send_requests(&h,l) == -1)
+ return -1;
+
+ return id;
}
int DNS::dns_getname4(const insp_inaddr *ip)
{ /* build, add and send PTR query; retrieve result with dns_getresult() */
#ifdef IPV6
- return -1;
+ return -1;
#else
- log(DEBUG,"DNS::dns_getname4");
- char query[512];
- s_header h;
- s_connection * s;
- unsigned char *c;
- int l;
+ log(DEBUG,"DNS::dns_getname4");
+ char query[512];
+ s_header h;
+ s_connection * s;
+ unsigned char *c;
+ int l;
+ int id;
+
+ c = (unsigned char *)&ip->s_addr;
+
+ sprintf(query,"%d.%d.%d.%d.in-addr.arpa",c[3],c[2],c[1],c[0]);
+
+ l = dns_build_query_payload(query,DNS_QRY_PTR,1,(unsigned char *)&h.payload);
+ if (l == -1)
+ return -1;
+ s = dns_add_query(&h, id);
+ if (s == NULL)
+ return -1;
+ s->_class = 1;
+ s->type = DNS_QRY_PTR;
+ if (s->send_requests(&h,l) == -1)
+ return -1;
+
+ return id;
+#endif
+}
- c = (unsigned char *)&ip->s_addr;
+/* Return the next id which is ready.
+ * result_list[id] will have been populated with the result string.
+ */
+int DNS::dns_getresult()
+{
+ /* retrieve result of DNS query (buffered) */
+ s_header h;
+ s_connection *c;
+ int length;
+ unsigned char buffer[sizeof(s_header)];
- sprintf(query,"%d.%d.%d.%d.in-addr.arpa",c[3],c[2],c[1],c[0]);
+ length = recv(master_socket,buffer,sizeof(s_header),0);
- l = dns_build_query_payload(query,DNS_QRY_PTR,1,(unsigned char *)&h.payload);
- if (l == -1)
- return -1;
- s = dns_add_query(&h);
- if (s == NULL)
- return -1;
- s->_class = 1;
- s->type = DNS_QRY_PTR;
- if (dns_send_requests(&h,s,l) == -1)
- return -1;
+ if (length < 12)
+ return -1;
- return s->fd;
-#endif
-}
+ dns_fill_header(&h,buffer,length - 12);
-char* DNS::dns_getresult(const int cfd) { /* retrieve result of DNS query */
- log(DEBUG,"DNS: dns_getresult with cfd=%d",cfd);
- return dns_getresult_s(cfd,this->localbuf);
-}
+ // Get the id of this request
+ unsigned long this_id = h.id[1] + (h.id[0] << 8);
-char* DNS::dns_getresult_s(const int cfd, char *res) { /* retrieve result of DNS query (buffered) */
- s_header h;
- s_connection *c;
- int l, i, q, curanswer, o;
- s_rr_middle rr;
- unsigned char buffer[sizeof(s_header)];
- unsigned short p;
-
- if (res)
- *res = 0;
-
- /* FireDNS used a linked list for this. How ugly (and slow). */
-
-#ifdef THREADED_DNS
- /* XXX: STL really does NOT like being poked and prodded in more than
- * one orifice by threaded apps. Make sure we remain nice to it, and
- * lock a mutex around any access to the std::map.
- */
- pthread_mutex_lock(&connmap_lock);
-#endif
- connlist_iter n_iter = connections.find(cfd);
+ // Do we have a pending request for it?
+
+ connlist_iter n_iter = connections.find(this_id);
if (n_iter == connections.end())
{
- log(DEBUG,"DNS: got a response for a query we didnt send with fd=%d",cfd);
-#ifdef THREADED_DNS
- pthread_mutex_unlock(&connmap_lock);
-#endif
- return NULL;
+ log(DEBUG,"DNS: got a response for a query we didnt send with fd=%d queryid=%d",master_socket,this_id);
+ return -1;
}
else
{
@@ -485,543 +409,287 @@ char* DNS::dns_getresult_s(const int cfd, char *res) { /* retrieve result of DNS
/* We don't delete c here, because its done later when needed */
connections.erase(n_iter);
}
-#ifdef THREADED_DNS
- pthread_mutex_unlock(&connmap_lock);
-#endif
+ unsigned char* a = c->result_ready(h, length);
- l = recv(c->fd,buffer,sizeof(s_header),0);
- dns_close(c->fd);
- if (l < 12)
- {
- DELETE(c);
- return NULL;
- }
- dns_fill_header(&h,buffer,l - 12);
- if (c->id[0] != h.id[0] || c->id[1] != h.id[1])
- {
- log(DEBUG,"DNS: id mismatch on query");
- DELETE(c);
- return NULL; /* ID mismatch */
- }
- if ((h.flags1 & FLAGS1_MASK_QR) == 0)
- {
- log(DEBUG,"DNS: didnt get a query result");
- DELETE(c);
- return NULL;
- }
- if ((h.flags1 & FLAGS1_MASK_OPCODE) != 0)
- {
- log(DEBUG,"DNS: got an OPCODE and didnt want one");
- DELETE(c);
- return NULL;
- }
- if ((h.flags2 & FLAGS2_MASK_RCODE) != 0)
- {
- log(DEBUG,"DNS lookup failed due to SERVFAIL");
- DELETE(c);
- return NULL;
- }
- if (h.ancount < 1)
- {
- log(DEBUG,"DNS: no answers!");
- DELETE(c);
- return NULL;
- }
- i = 0;
- q = 0;
- l -= 12;
- while ((unsigned)q < h.qdcount && i < l)
- {
- if (h.payload[i] > 63)
- {
- i += 6;
- q++;
- }
- else
- {
- if (h.payload[i] == 0)
- {
- q++;
- i += 5;
- }
- else i += h.payload[i] + 1;
- }
- }
- curanswer = 0;
- while ((unsigned)curanswer < h.ancount)
- {
- q = 0;
- while (q == 0 && i < l)
- {
- if (h.payload[i] > 63)
- {
- i += 2;
- q = 1;
- }
- else
- {
- if (h.payload[i] == 0)
- {
- i++;
- q = 1;
- }
- else i += h.payload[i] + 1; /* skip length and label */
- }
- }
- if (l - i < 10)
- {
- DELETE(c);
- return NULL;
- }
- dns_fill_rr(&rr,&h.payload[i]);
- i += 10;
- if (rr.type != c->type)
- {
- curanswer++;
- i += rr.rdlength;
- continue;
- }
- if (rr._class != c->_class)
- {
- curanswer++;
- i += rr.rdlength;
- continue;
- }
- break;
- }
- if ((unsigned)curanswer == h.ancount)
- return NULL;
- if ((unsigned)i + rr.rdlength > (unsigned)l)
- return NULL;
- if (rr.rdlength > 1023)
- return NULL;
-
- switch (rr.type)
- {
- case DNS_QRY_PTR:
- log(DEBUG,"DNS: got a result of type DNS_QRY_PTR");
- o = 0;
- q = 0;
- while (q == 0 && i < l && o + 256 < 1023)
- {
- if (h.payload[i] > 63)
- {
- log(DEBUG,"DNS: h.payload[i] > 63");
- memcpy(&p,&h.payload[i],2);
- i = ntohs(p) - 0xC000 - 12;
- }
- else
- {
- if (h.payload[i] == 0)
- {
- q = 1;
- }
- else
- {
- res[o] = '\0';
- if (o != 0)
- res[o++] = '.';
- memcpy(&res[o],&h.payload[i + 1],h.payload[i]);
- o += h.payload[i];
- i += h.payload[i] + 1;
- }
- }
- }
- res[o] = '\0';
- break;
- case DNS_QRY_A:
- log(DEBUG,"DNS: got a result of type DNS_QRY_A");
- if (c->want_list)
- {
- 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;
- if (rr.rdlength != 4)
- {
- DELETE(c);
- return NULL;
- }
- memcpy(&alist->ip,&h.payload[i],4);
- if ((unsigned)++curanswer >= h.ancount)
- break;
- i += rr.rdlength;
- q = 0;
- while (q == 0 && i < l)
- {
- if (h.payload[i] > 63)
- {
- i += 2;
- q = 1;
- }
- else
- {
- if (h.payload[i] == 0)
- {
- i++;
- q = 1;
- }
- else i += h.payload[i] + 1;
- }
- }
- if (l - i < 10)
- {
- DELETE(c);
- return NULL;
- }
- dns_fill_rr(&rr,&h.payload[i]);
- i += 10;
- alist->next = (dns_ip4list *) dns_align(((char *) alist) + sizeof(dns_ip4list));
- alist = alist->next;
- alist->next = NULL;
- }
- alist->next = NULL;
- break;
- }
- memcpy(res,&h.payload[i],rr.rdlength);
- res[rr.rdlength] = '\0';
- break;
- default:
- memcpy(res,&h.payload[i],rr.rdlength);
- res[rr.rdlength] = '\0';
- break;
- }
- DELETE(c);
- return res;
-}
-
-DNS::DNS()
-{
- dns_init();
- log(DEBUG,"Create blank DNS");
-}
-
-DNS::DNS(const std::string &dnsserver)
-{
- dns_init_2(dnsserver.c_str());
- log(DEBUG,"Create DNS with server '%s'",dnsserver.c_str());
-}
-
-void DNS::SetNS(const std::string &dnsserver)
-{
- dns_init_2(dnsserver.c_str());
- log(DEBUG,"Set NS");
-}
-
-DNS::~DNS()
-{
-}
-
-bool DNS::ReverseLookup(const std::string &ip, bool ins)
-{
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDns++;
- insp_inaddr binip;
- if (insp_aton(ip.c_str(), &binip) < 1)
- {
- return false;
- }
-
- this->myfd = dns_getname4(&binip);
- if (this->myfd == -1)
- {
- return false;
- }
- log(DEBUG,"DNS: ReverseLookup, fd=%d",this->myfd);
-#ifndef THREADED_DNS
- if (ins)
- {
- if (ServerInstance && ServerInstance->SE)
- ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
- }
-#endif
- return true;
-}
-
-bool DNS::ForwardLookup(const std::string &host, bool ins)
-{
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDns++;
- this->myfd = dns_getip4(host.c_str());
- if (this->myfd == -1)
- {
- return false;
- }
- log(DEBUG,"DNS: ForwardLookup, fd=%d",this->myfd);
-#ifndef THREADED_DNS
- if (ins)
- {
- if (ServerInstance && ServerInstance->SE)
- ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
- }
-#endif
- return true;
-}
-
-bool DNS::ForwardLookupWithFD(const std::string &host, int &fd)
-{
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDns++;
- this->myfd = dns_getip4(host.c_str());
- fd = this->myfd;
- if (this->myfd == -1)
- {
- return false;
- }
- log(DEBUG,"DNS: ForwardLookupWithFD, fd=%d",this->myfd);
- if (ServerInstance && ServerInstance->SE)
- ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_MODULE);
- return true;
-}
+ if (a == NULL)
+ {
+ result_list[this_id] = "";
+ }
+ else
+ {
+ if (c->type == DNS_QRY_A)
+ {
+ char formatted[1024];
+ snprintf(formatted,1024,"%u.%u.%u.%u",a[0],a[1],a[2],a[3]);
+ result_list[this_id] = std::string(formatted);
+ }
+ else
+ {
+ result_list[this_id] = std::string((const char*)a);
+ }
+ }
-bool DNS::HasResult(int fd)
-{
- return (fd == this->myfd);
+ delete c;
+ return this_id;
}
-/* Only the multithreaded dns uses this poll() based
- * check now. As its in another thread we dont have
- * to worry about its performance that much.
+/** A result is ready, process it
*/
-bool DNS::HasResult()
-{
- log(DEBUG,"DNS: HasResult, fd=%d",this->myfd);
- pollfd polls;
- polls.fd = this->myfd;
- polls.events = POLLIN;
- int ret = poll(&polls,1,1);
- log(DEBUG,"DNS: Hasresult returning %d",ret);
- return (ret > 0);
-}
-
-int DNS::GetFD()
+unsigned char* s_connection::result_ready(s_header &h, int length)
{
- return this->myfd;
-}
-
-std::string DNS::GetResult()
-{
- log(DEBUG,"DNS: GetResult()");
- result = dns_getresult(this->myfd);
- if (result)
- {
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsGood++;
- dns_close(this->myfd);
- this->myfd = -1;
- return result;
- }
- else
- {
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsBad++;
- if (this->myfd != -1)
- {
- dns_close(this->myfd);
- this->myfd = -1;
- }
- return "";
- }
+ int i, q, curanswer, o;
+ s_rr_middle rr;
+ unsigned short p;
+
+ if ((h.flags1 & FLAGS1_MASK_QR) == 0)
+ {
+ log(DEBUG,"DNS: didnt get a query result");
+ return NULL;
+ }
+ if ((h.flags1 & FLAGS1_MASK_OPCODE) != 0)
+ {
+ log(DEBUG,"DNS: got an OPCODE and didnt want one");
+ return NULL;
+ }
+ if ((h.flags2 & FLAGS2_MASK_RCODE) != 0)
+ {
+ log(DEBUG,"DNS lookup failed due to SERVFAIL");
+ return NULL;
+ }
+ if (h.ancount < 1)
+ {
+ log(DEBUG,"DNS: no answers!");
+ return NULL;
+ }
+ i = 0;
+ q = 0;
+ length -= 12;
+ while ((unsigned)q < h.qdcount && i < length)
+ {
+ if (h.payload[i] > 63)
+ {
+ i += 6;
+ q++;
+ }
+ else
+ {
+ if (h.payload[i] == 0)
+ {
+ q++;
+ i += 5;
+ }
+ else i += h.payload[i] + 1;
+ }
+ }
+ curanswer = 0;
+ while ((unsigned)curanswer < h.ancount)
+ {
+ q = 0;
+ while (q == 0 && i < length)
+ {
+ if (h.payload[i] > 63)
+ {
+ i += 2;
+ q = 1;
+ }
+ else
+ {
+ if (h.payload[i] == 0)
+ {
+ i++;
+ q = 1;
+ }
+ else i += h.payload[i] + 1; /* skip length and label */
+ }
+ }
+ if (length - i < 10)
+ {
+ return NULL;
+ }
+ dns_fill_rr(&rr,&h.payload[i]);
+ i += 10;
+ if (rr.type != this->type)
+ {
+ curanswer++;
+ i += rr.rdlength;
+ continue;
+ }
+ if (rr._class != this->_class)
+ {
+ curanswer++;
+ i += rr.rdlength;
+ continue;
+ }
+ break;
+ }
+ if ((unsigned int)curanswer == h.ancount)
+ return NULL;
+ if (i + rr.rdlength > (unsigned int)length)
+ return NULL;
+ if (rr.rdlength > 1023)
+ return NULL;
+
+ switch (rr.type)
+ {
+ case DNS_QRY_PTR:
+ log(DEBUG,"DNS: got a result of type DNS_QRY_PTR");
+ o = 0;
+ q = 0;
+ while (q == 0 && i < length && o + 256 < 1023)
+ {
+ if (h.payload[i] > 63)
+ {
+ log(DEBUG,"DNS: h.payload[i] > 63");
+ memcpy(&p,&h.payload[i],2);
+ i = ntohs(p) - 0xC000 - 12;
+ }
+ else
+ {
+ if (h.payload[i] == 0)
+ {
+ q = 1;
+ }
+ else
+ {
+ res[o] = '\0';
+ if (o != 0)
+ res[o++] = '.';
+ memcpy(&res[o],&h.payload[i + 1],h.payload[i]);
+ o += h.payload[i];
+ i += h.payload[i] + 1;
+ }
+ }
+ }
+ res[o] = '\0';
+ break;
+ case DNS_QRY_A:
+ log(DEBUG,"DNS: got a result of type DNS_QRY_A");
+ if (this->want_list)
+ {
+ 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;
+ if (rr.rdlength != 4)
+ {
+ return NULL;
+ }
+ memcpy(&alist->ip,&h.payload[i],4);
+ if ((unsigned)++curanswer >= h.ancount)
+ break;
+ i += rr.rdlength;
+ q = 0;
+ while (q == 0 && i < length)
+ {
+ if (h.payload[i] > 63)
+ {
+ i += 2;
+ q = 1;
+ }
+ else
+ {
+ if (h.payload[i] == 0)
+ {
+ i++;
+ q = 1;
+ }
+ else i += h.payload[i] + 1;
+ }
+ }
+ if (length - i < 10)
+ {
+ return NULL;
+ }
+ dns_fill_rr(&rr,&h.payload[i]);
+ i += 10;
+ alist->next = (dns_ip4list *) dns_align(((char *) alist) + sizeof(dns_ip4list));
+ alist = alist->next;
+ alist->next = NULL;
+ }
+ alist->next = NULL;
+ break;
+ }
+ memcpy(res,&h.payload[i],rr.rdlength);
+ res[rr.rdlength] = '\0';
+ break;
+ default:
+ memcpy(res,&h.payload[i],rr.rdlength);
+ res[rr.rdlength] = '\0';
+ break;
+ }
+ return res;
}
-std::string DNS::GetResultIP()
+DNS::DNS()
{
- char r[1024];
- log(DEBUG,"DNS: GetResultIP()");
- result = dns_getresult(this->myfd);
- if (this->myfd != -1)
- {
- dns_close(this->myfd);
- this->myfd = -1;
- }
- if (result)
- {
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsGood++;
- unsigned char a = (unsigned)result[0];
- unsigned char b = (unsigned)result[1];
- unsigned char c = (unsigned)result[2];
- unsigned char d = (unsigned)result[3];
- snprintf(r,1024,"%u.%u.%u.%u",a,b,c,d);
- return r;
- }
- else
- {
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsBad++;
- log(DEBUG,"DANGER WILL ROBINSON! NXDOMAIN for forward lookup, but we got a reverse lookup!");
- return "";
- }
+ log(DEBUG,"Create blank DNS");
}
-
-
-#ifdef THREADED_DNS
-
-/* This function is a thread function which can be thought of as a lightweight process
- * to all you non-threaded people. In actuality its so much more, and pretty damn cool.
- * With threaded dns enabled, each user which connects gets a thread attached to their
- * user record when their DNS lookup starts. This function starts in parallel, and
- * commences a blocking dns lookup. Because its a seperate thread, this occurs without
- * actually blocking the main application. Once the dns lookup is completed, the thread
- * checks if the user is still around by checking their fd against the reference table,
- * and if they are, writes the hostname into the struct and terminates, after setting
- * userrec::dns_done to true. Because this is multi-threaded it can make proper use of
- * SMP setups (like the one i have here *grin*).
- * This is in comparison to the non-threaded dns, which must monitor the thread sockets
- * in a nonblocking fashion, consuming more resources to do so.
- *
- * NB: Yes this does scale, thank you. Even with large numbers of connecting clients
- * in any one timeframe, they wont all connect *at the same time* therefore any argument
- * of "but there will be thousands of threads it'll blow up" is moot, ive tested this and
- * there will only ever be somewhere around the listen backlog in number of pending
- * lookups at any one time. This is significant on any modern SMP system.
- */
-void* dns_task(void* arg)
+DNS::~DNS()
{
- userrec* u = (userrec*)arg;
- int thisfd = u->fd;
-
- log(DEBUG,"DNS thread for user %s on ip %s",u->nick,insp_ntoa(u->ip4));
- DNS dns1(Config->DNSServer);
- DNS dns2(Config->DNSServer);
- std::string host;
- std::string ip;
- int iterations = 0;
-
- if (dns1.ReverseLookup(insp_ntoa(u->ip4),false))
- {
- /* FIX: Dont make these infinite! */
- while ((!dns1.HasResult()) && (++iterations < 20))
- usleep(100);
-
- if (iterations < 20)
- {
- if (dns1.GetFD() != -1)
- {
- host = dns1.GetResult();
- if (host != "")
- {
- if (dns2.ForwardLookup(host, false))
- {
- iterations = 0;
- while ((!dns2.HasResult()) && (++iterations < 20))
- usleep(100);
-
- if (iterations < 20)
- {
- if (dns2.GetFD() != -1)
- {
- ip = dns2.GetResultIP();
- if (ip == std::string(insp_ntoa(u->ip4)))
- {
- if (host.length() < 65)
- {
- if ((fd_ref_table[thisfd] == u) && (fd_ref_table[thisfd]))
- {
- if (!u->dns_done)
- {
- strcpy(u->host,host.c_str());
- if ((fd_ref_table[thisfd] == u) && (fd_ref_table[thisfd]))
- {
- strcpy(u->dhost,host.c_str());
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- if ((fd_ref_table[thisfd] == u) && (fd_ref_table[thisfd]))
- u->dns_done = true;
- log(DEBUG,"THREAD EXIT");
- return NULL;
}
-#endif
Resolver::Resolver(const std::string &source, bool forward, const std::string &dnsserver = "") : input(source), fwd(forward), server(dnsserver)
{
- if (this->server != "")
- Query.SetNS(this->server);
- else
- Query.SetNS(Config->DNSServer);
-
- if (forward)
- {
- Query.ForwardLookup(input.c_str(), false);
- this->fd = Query.GetFD();
- }
- else
- {
- Query.ReverseLookup(input.c_str(), false);
- this->fd = Query.GetFD();
- }
- if (fd < 0)
- {
- log(DEBUG,"Resolver::Resolver: RESOLVER_NSDOWN");
- this->OnError(RESOLVER_NSDOWN);
- ModuleException e("Resolver: Nameserver is down");
- throw e;
- /* We shouldnt get here really */
- return;
- }
+ if (forward)
+ {
+ this->myid = Res->dns_getip4(source.c_str());
+ }
+ else
+ {
+ insp_inaddr binip;
+ if (insp_aton(source.c_str(), &binip) > 0)
+ {
+ /* Valid ip address */
+ this->myid = Res->dns_getname4(&binip);
+ }
+ }
+ if (this->myid == -1)
+ {
+ log(DEBUG,"Resolver::Resolver: Could not get an id!");
+ this->OnError(RESOLVER_NSDOWN);
+ ModuleException e("Resolver: Couldnt get an id to make a request");
+ throw e;
+ /* We shouldnt get here really */
+ return;
+ }
- if (ServerInstance && ServerInstance->SE)
- {
- log(DEBUG,"Resolver::Resolver: this->fd=%d",this->fd);
- ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_CLASSDNS);
- }
- else
- {
- log(DEBUG,"Resolver::Resolver: RESOLVER_NOTREADY");
- this->OnError(RESOLVER_NOTREADY);
- ModuleException e("Resolver: Core not initialized yet");
- throw e;
- /* We shouldnt get here really */
- return;
- }
+ log(DEBUG,"Resolver::Resolver: this->myid=%d",this->myid);
}
Resolver::~Resolver()
{
- log(DEBUG,"Resolver::~Resolver");
- if (ServerInstance && ServerInstance->SE)
- ServerInstance->SE->DelFd(this->fd);
+ log(DEBUG,"Resolver::~Resolver");
}
-int Resolver::GetFd()
+int Resolver::GetId()
{
- return this->fd;
+ return this->myid;
}
bool Resolver::ProcessResult()
{
- log(DEBUG,"Resolver::ProcessResult");
- if (this->fwd)
- result = Query.GetResultIP();
- else
- result = Query.GetResult();
+ log(DEBUG,"Resolver::ProcessResult");
- if (result != "")
- {
- log(DEBUG,"Resolver::OnLookupComplete(%s)",result.c_str());
- this->OnLookupComplete(result);
- return true;
- }
- else
- {
- log(DEBUG,"Resolver::OnError(RESOLVER_NXDOMAIN)");
- this->OnError(RESOLVER_NXDOMAIN);
- return false;
- }
+ std::map<int, std::string>::iterator x = result_list.find(this->myid);
+
+ if (x == result_list.end())
+ {
+ log(DEBUG,"Resolver::OnError(RESOLVER_NXDOMAIN)");
+ this->OnError(RESOLVER_NXDOMAIN);
+ return false;
+ }
+ else
+ {
+
+ log(DEBUG,"Resolver::OnLookupComplete(%s)",x->second.c_str());
+ this->OnLookupComplete(x->second);
+ result_list.erase(x);
+ return true;
+ }
}
void Resolver::OnLookupComplete(const std::string &result)
@@ -1034,43 +702,49 @@ void Resolver::OnError(ResolverError e)
void dns_deal_with_classes(int fd)
{
- log(DEBUG,"dns_deal_with_classes(%d)",fd);
- if ((fd > -1) && (dns_classes[fd]))
- {
- log(DEBUG,"Valid fd %d",fd);
- dns_classes[fd]->ProcessResult();
- delete dns_classes[fd];
- dns_classes[fd] = NULL;
- }
+ log(DEBUG,"dns_deal_with_classes(%d)",fd);
+ if (fd == master_socket)
+ {
+ int id = Res->dns_getresult();
+ if (id != -1)
+ {
+ log(DEBUG,"Result available, id=%d",id);
+ dns_classes[id]->ProcessResult();
+ delete dns_classes[id];
+ dns_classes[id] = NULL;
+ }
+ }
}
bool dns_add_class(Resolver* r)
{
- log(DEBUG,"dns_add_class");
- if ((r) && (r->GetFd() > -1))
- {
- if (!dns_classes[r->GetFd()])
- {
- log(DEBUG,"dns_add_class: added class");
- dns_classes[r->GetFd()] = r;
- return true;
- }
- else
- {
- log(DEBUG,"Space occupied!");
- return false;
- }
- }
- else
- {
- log(DEBUG,"Bad class");
- delete r;
- return true;
- }
+ log(DEBUG,"dns_add_class");
+ if ((r) && (r->GetId() > -1))
+ {
+ if (!dns_classes[r->GetId()])
+ {
+ log(DEBUG,"dns_add_class: added class");
+ dns_classes[r->GetId()] = r;
+ return true;
+ }
+ else
+ {
+ log(DEBUG,"Space occupied!");
+ return false;
+ }
+ }
+ else
+ {
+ log(DEBUG,"Bad class");
+ delete r;
+ return true;
+ }
}
void init_dns()
{
- memset(dns_classes,0,sizeof(dns_classes));
+ Res = new DNS();
+ memset(dns_classes,0,sizeof(dns_classes));
+ create_socket();
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-21 20:49:36 +0000