Support for hostnames in <bind> tag (so long as the hostname resolves to a locally bindable ip)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@3621 e03df62e-2008-0410-955e-edbf42e46eb7

3 files changed, 77 insertions, 24 deletions

diff --git a/src/dns.cpp b/src/dns.cpp
index 3b8f8cc95..ef3eb704e 100644
--- a/src/dns.cpp
+++ b/src/dns.cpp
@@ -162,7 +162,8 @@ inline void dns_empty_header(unsigned char *output, const s_header *header, cons
 void dns_close(int fd)
 {
 #ifndef THREADED_DNS
-        ServerInstance->SE->DelFd(fd);
+	if (ServerInstance && ServerInstance->SE)
+		ServerInstance->SE->DelFd(fd);
 #endif
 	log(DEBUG,"DNS: dns_close on fd %d",fd);
 	if (fd == lastcreate)
@@ -686,7 +687,7 @@ DNS::DNS()
 DNS::DNS(std::string dnsserver)
 {
 	dns_init_2(dnsserver.c_str());
-	log(DEBUG,"Create DNS");
+	log(DEBUG,"Create DNS with server '%s'",dnsserver.c_str());
 }
 
 void DNS::SetNS(std::string dnsserver)
@@ -701,7 +702,8 @@ DNS::~DNS()
 
 bool DNS::ReverseLookup(std::string ip)
 {
-	ServerInstance->stats->statsDns++;
+	if (ServerInstance && ServerInstance->stats)
+		ServerInstance->stats->statsDns++;
         binip = dns_aton4(ip.c_str());
         if (binip == NULL)
 	{
@@ -715,14 +717,16 @@ bool DNS::ReverseLookup(std::string ip)
 	}
 	log(DEBUG,"DNS: ReverseLookup, fd=%d",this->myfd);
 #ifndef THREADED_DNS
-	ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
+	if (ServerInstance && ServerInstance->SE)
+		ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
 #endif
 	return true;
 }
 
 bool DNS::ForwardLookup(std::string host)
 {
-	ServerInstance->stats->statsDns++;
+	if (ServerInstance && ServerInstance->stats)
+		ServerInstance->stats->statsDns++;
 	this->myfd = dns_getip4(host.c_str());
 	if (this->myfd == -1)
 	{
@@ -730,14 +734,16 @@ bool DNS::ForwardLookup(std::string host)
 	}
 	log(DEBUG,"DNS: ForwardLookup, fd=%d",this->myfd);
 #ifndef THREADED_DNS
-	ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
+	if (ServerInstance && ServerInstance->SE)
+		ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_DNS);
 #endif
 	return true;
 }
 
 bool DNS::ForwardLookupWithFD(std::string host, int &fd)
 {
-	ServerInstance->stats->statsDns++;
+	if (ServerInstance && ServerInstance->stats)
+		ServerInstance->stats->statsDns++;
 	this->myfd = dns_getip4(host.c_str());
 	fd = this->myfd;
 	if (this->myfd == -1)
@@ -745,7 +751,8 @@ bool DNS::ForwardLookupWithFD(std::string host, int &fd)
 		
 	}
 	log(DEBUG,"DNS: ForwardLookupWithFD, fd=%d",this->myfd);
-	ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_MODULE);
+	if (ServerInstance && ServerInstance->SE)
+		ServerInstance->SE->AddFd(this->myfd,true,X_ESTAB_MODULE);
 	return true;
 }
 
@@ -780,13 +787,15 @@ std::string DNS::GetResult()
         result = dns_getresult(this->myfd);
         if (result)
 	{
-		ServerInstance->stats->statsDnsGood++;
+		if (ServerInstance && ServerInstance->stats)
+			ServerInstance->stats->statsDnsGood++;
 		dns_close(this->myfd);
 		return result;
         }
 	else
 	{
-		ServerInstance->stats->statsDnsBad++;
+		if (ServerInstance && ServerInstance->stats)
+			ServerInstance->stats->statsDnsBad++;
 		if (this->myfd != -1)
 		{
 			dns_close(this->myfd);
@@ -806,7 +815,8 @@ std::string DNS::GetResultIP()
 	}
 	if (result)
 	{
-		ServerInstance->stats->statsDnsGood++;
+		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];
@@ -816,7 +826,8 @@ std::string DNS::GetResultIP()
 	}
 	else
 	{
-		ServerInstance->stats->statsDnsBad++;
+		if (ServerInstance && ServerInstance->stats)
+			ServerInstance->stats->statsDnsBad++;
 		log(DEBUG,"DANGER WILL ROBINSON! NXDOMAIN for forward lookup, but we got a reverse lookup!");
 		return "";
 	}
diff --git a/src/inspircd_io.cpp b/src/inspircd_io.cpp
index 53f58c4f1..4fa87a5f1 100644
--- a/src/inspircd_io.cpp
+++ b/src/inspircd_io.cpp
@@ -25,6 +25,7 @@ using namespace std;
 #include <sstream>
 #include <iostream>
 #include <fstream>
+#include "message.h"
 #include "inspircd.h"
 #include "inspircd_io.h"
 #include "inspstring.h"
@@ -1303,25 +1304,57 @@ int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server
 {
 	memset((char *)&server,0,sizeof(server));
 	struct in_addr addy;
-	inet_aton(addr,&addy);
-	server.sin_family = AF_INET;
-	if (!*addr)
+	bool resolved = false;
+	char resolved_addr[128];
+
+	if (*addr == '*')
+		*addr = 0;
+
+	if (*addr && !inet_aton(addr,&addy))
 	{
-		server.sin_addr.s_addr = htonl(INADDR_ANY);
+		/* If they gave a hostname, bind to the IP it resolves to */
+		if (CleanAndResolve(resolved_addr, addr, true))
+		{
+			inet_aton(resolved_addr,&addy);
+			log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
+			server.sin_addr = addy;
+			resolved = true;
+		}
+		else
+		{
+			log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
+			return(FALSE);
+		}
 	}
-	else
+	server.sin_family = AF_INET;
+	if (!resolved)
 	{
-		server.sin_addr = addy;
+		if (!*addr)
+		{
+			server.sin_addr.s_addr = htonl(INADDR_ANY);
+		}
+		else
+		{
+			server.sin_addr = addy;
+		}
 	}
 	server.sin_port = htons(port);
-	if (bind(sockfd,(struct sockaddr*)&server,sizeof(server))<0)
+	if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
 	{
 		return(ERROR);
 	}
 	else
 	{
-		listen(sockfd, Config->MaxConn);
-		return(TRUE);
+		log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
+		if (listen(sockfd, Config->MaxConn) == -1)
+		{
+			log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
+			return(FALSE);
+		}
+		else
+		{
+			return(TRUE);
+		}
 	}
 }
 
diff --git a/src/message.cpp b/src/message.cpp
index 29a4ae998..39c321f42 100644
--- a/src/message.cpp
+++ b/src/message.cpp
@@ -166,15 +166,24 @@ void NonBlocking(int s)
 	fcntl(s, F_SETFL, flags | O_NONBLOCK);
 }
 
-int CleanAndResolve (char *resolvedHost, const char *unresolvedHost)
+int CleanAndResolve (char *resolvedHost, const char *unresolvedHost, bool forward)
 {
+	int fd;
+	std::string ipaddr;
+
 	DNS d(Config->DNSServer);
-	int fd = d.ReverseLookup(unresolvedHost);
+	if (forward)
+		fd = d.ForwardLookup(unresolvedHost);
+	else
+		fd = d.ReverseLookup(unresolvedHost);
 	if (fd < 0)
 		return 0;
 	time_t T = time(NULL)+1;
 	while ((!d.HasResult()) && (time(NULL)<T));
-	std::string ipaddr = d.GetResult();
+	if (forward)
+		ipaddr = d.GetResultIP();
+	else
+		ipaddr = d.GetResult();
 	strlcpy(resolvedHost,ipaddr.c_str(),MAXBUF);
 	return (ipaddr != "");
 }