X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=citadel%2Flocate_host.c;h=64879eefbb797115d5037b89572205a702977611;hb=HEAD;hp=282bf55afc0dc5358d5e09672296329ff1d122cf;hpb=b5f894f3ab14bff8305c4bd8353e0f9d128923f6;p=citadel.git

diff --git a/citadel/locate_host.c b/citadel/locate_host.c
deleted file mode 100644
index 282bf55af..000000000
--- a/citadel/locate_host.c
+++ /dev/null
@@ -1,268 +0,0 @@
-/*
- * $Id$
- *
- * Functions which handle hostname/address lookups and resolution
- *
- */
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <limits.h>
-#include <netdb.h>
-#include <string.h>
-#include <errno.h>
-#include <libcitadel.h>
-#include "citadel.h"
-#include "server.h"
-#include "locate_host.h"
-#include "sysdep_decls.h"
-#include "config.h"
-#include "domain.h"
-#include "context.h"
-#include "ctdl_module.h"
-
-#ifdef HAVE_RESOLV_H
-#include <arpa/nameser.h>
-#ifdef HAVE_ARPA_NAMESER_COMPAT_H
-#include <arpa/nameser_compat.h>
-#endif
-#include <resolv.h>
-#endif
-
-
-/*
- * Given an open client socket, return the host name and IP address at the other end.
- * (IPv4 and IPv6 compatible)
- */
-void locate_host(char *tbuf, size_t n, char *abuf, size_t na, int client_socket)
-{
-	struct sockaddr_in6 clientaddr;
-	unsigned int addrlen = sizeof(clientaddr);
-
-	tbuf[0] = 0;
-	abuf[0] = 0;
-
-	getpeername(client_socket, (struct sockaddr *)&clientaddr, &addrlen);
-	getnameinfo((struct sockaddr *)&clientaddr, addrlen, tbuf, n, NULL, 0, 0);
-	getnameinfo((struct sockaddr *)&clientaddr, addrlen, abuf, na, NULL, 0, NI_NUMERICHOST);
-
-	/* Convert IPv6-mapped IPv4 addresses back to traditional dotted quad */
-	if ( (strlen(abuf) > 7) && (!strncasecmp(abuf, "::ffff:", 7)) ) {
-		strcpy(abuf, &abuf[7]);
-	}
-}
-
-
-/*
- * RBL check written by Edward S. Marshall [http://rblcheck.sourceforge.net]
- */
-#define RESULT_SIZE 4096 /* What is the longest result text we support? */
-int rblcheck_backend(char *domain, char *txtbuf, int txtbufsize) {
-	int a, b, c;
-	char *result = NULL;
-	u_char fixedans[ PACKETSZ ];
-	u_char *answer;
-	int need_to_free_answer = 0;
-	const u_char *cp;
-	u_char *rp;
-	const u_char *cend;
-	const u_char *rend;
-	int len;
-	char *p = NULL;
-
-	/* Make our DNS query. */
-	//res_init();
-	answer = fixedans;
-	if (CtdlThreadCheckStop())
-	{
-		if (txtbuf != NULL)
-			snprintf(txtbuf, txtbufsize, "System shutting down");
-		return (1);
-	}
-	len = res_query( domain, C_IN, T_A, answer, PACKETSZ );
-
-	/* Was there a problem? If so, the domain doesn't exist. */
-	if( len == -1 ) {
-		if (txtbuf != NULL) {
-			strcpy(txtbuf, "");
-		}
-		return(0);
-	}
-
-	if( len > PACKETSZ )
-	{
-		answer = malloc( len );
-		need_to_free_answer = 1;
-		len = res_query( domain, C_IN, T_A, answer, len );
-		if( len == -1 ) {
-			if (txtbuf != NULL) {
-				snprintf(txtbuf, txtbufsize,
-					"Message rejected due to known spammer source IP address");
-			}
-			if (need_to_free_answer) free(answer);
-			return(1);
-		}
-	}
-	if (CtdlThreadCheckStop())
-	{
-		if (txtbuf != NULL)
-			snprintf(txtbuf, txtbufsize, "System shutting down");
-		if (need_to_free_answer) free(answer);
-		return (1);
-	}
-
-	result = ( char * )malloc( RESULT_SIZE );
-	result[ 0 ] = '\0';
-
-
-	/* Make another DNS query for textual data; this shouldn't
-	   be a performance hit, since it'll now be cached at the
-	   nameserver we're using. */
-	res_init();
-	len = res_query( domain, C_IN, T_TXT, answer, PACKETSZ );
-	if (CtdlThreadCheckStop())
-	{
-		if (txtbuf != NULL)
-			snprintf(txtbuf, txtbufsize, "System shutting down");
-		if (need_to_free_answer) free(answer);
-		free(result);
-		return (1);
-	}
-
-	/* Just in case there's no TXT record... */
-	if( len == -1 )
-	{
-		if (txtbuf != NULL) {
-			snprintf(txtbuf, txtbufsize,
-				"Message rejected due to known spammer source IP address");
-		}
-		if (need_to_free_answer) free(answer);
-		free(result);
-		return(1);
-	}
-
-	/* Skip the header and the address we queried. */
-	cp = answer + sizeof( HEADER );
-	while( *cp != '\0' )
-	{
-		a = *cp++;
-		while( a-- )
-			cp++;
-	}
-
-	/* This seems to be a bit of magic data that we need to
-	   skip. I wish there were good online documentation
-	   for programming for libresolv, so I'd know what I'm
-	   skipping here. Anyone reading this, feel free to
-	   enlighten me. */
-	cp += 1 + NS_INT16SZ + NS_INT32SZ;
-
-	/* Skip the type, class and ttl. */
-	cp += ( NS_INT16SZ * 2 ) + NS_INT32SZ;
-
-	/* Get the length and end of the buffer. */
-	NS_GET16( c, cp );
-	cend = cp + c;
-
-	/* Iterate over any multiple answers we might have. In
-	   this context, it's unlikely, but anyway. */
-	rp = (u_char *) result;
-	rend = (u_char *) result + RESULT_SIZE - 1;
-	while( cp < cend && rp < rend )
-	{
-		a = *cp++;
-		if( a != 0 )
-			for( b = a; b > 0 && cp < cend && rp < rend;
-			  b-- )
-			{
-				if( *cp == '\n' || *cp == '"' ||
-				  *cp == '\\' )
-				{
-					*rp++ = '\\';
-				}
-				*rp++ = *cp++;
-			}
-	}
-	*rp = '\0';
-	if (txtbuf != NULL) {
-		snprintf(txtbuf, txtbufsize, "%s", result);
-	}
-	/* Remove nonprintable characters */
-	for (p=txtbuf; *p; ++p) {
-		if (!isprint(*p)) strcpy(p, p+1);
-	}
-	if (need_to_free_answer) free(answer);
-	free(result);
-	return(1);
-}
-
-
-/*
- * Check to see if the client host is on some sort of spam list (RBL)
- * If spammer, returns nonzero and places reason in 'message_to_spammer'
- *
- * FIXME: support IPv6 RBL as specified in http://tools.ietf.org/html/draft-irtf-asrg-dnsbl-08
- */
-int rbl_check(char *message_to_spammer)
-{
-	int a1, a2, a3, a4;
-	char tbuf[256];
-	int rbl;
-	int num_rbl;
-	char rbl_domains[SIZ];
-	char txt_answer[1024];
-
-	strcpy(message_to_spammer, "ok");
-	sscanf(CC->cs_addr, "%d.%d.%d.%d", &a1, &a2, &a3, &a4);
-
-	/* See if we have any RBL domains configured */
-	num_rbl = get_hosts(rbl_domains, "rbl");
-	if (num_rbl < 1) return(0);
-
-	/* Try all configured RBL's */
-        for (rbl=0; rbl<num_rbl; ++rbl) {
-		snprintf(tbuf, sizeof tbuf, "%d.%d.%d.%d.", a4, a3, a2, a1);
-                extract_token(&tbuf[strlen(tbuf)], rbl_domains, rbl, '|', (sizeof tbuf - strlen(tbuf)));
-
-		if (rblcheck_backend(tbuf, txt_answer, sizeof txt_answer)) {
-			strcpy(message_to_spammer, txt_answer);
-			CtdlLogPrintf(CTDL_INFO, "RBL: %s\n", txt_answer);
-			return(1);
-		}
-	}
-
-	return(0);
-}
-			
-
-/*
- * Convert a host name to a dotted quad address. 
- * Returns zero on success or nonzero on failure.
- */
-int hostname_to_dotted_quad(char *addr, char *host) {
-	struct hostent *ch;
-	const char *i;
-	int a1, a2, a3, a4;
-
-	ch = gethostbyname(host);
-	if (ch == NULL) {
-		strcpy(addr, "0.0.0.0");
-		return(1);
-	}
-
-	i = (const char *) ch->h_addr_list[0];
-	a1 = ((*i++) & 0xff);
-	a2 = ((*i++) & 0xff);
-	a3 = ((*i++) & 0xff);
-	a4 = ((*i++) & 0xff);
-	sprintf(addr, "%d.%d.%d.%d", a1, a2, a3, a4);
-	return(0);
-}