X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=citadel%2Flocate_host.c;h=7bab2e4d0852be09b97ad8e025dd564dc9145eda;hb=HEAD;hp=d964bc72e0f27972e1dca54708076ccaba031baf;hpb=aa7365c86de8e26e796d3aa3fd605c85d8c26220;p=citadel.git

diff --git a/citadel/locate_host.c b/citadel/locate_host.c
deleted file mode 100644
index d964bc72e..000000000
--- a/citadel/locate_host.c
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
- * Functions which handle hostname/address lookups and resolution
- *
- * Copyright (c) 1987-2011 by the citadel.org team
- *
- * This program is open source software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 3.
- *
- * 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.
- */
-
-#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 <syslog.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
-
-/** START:some missing macros on OpenBSD 3.9 */
-#ifndef NS_CMPRSFLGS
-#define NS_CMPRSFLGS   0xc0
-#endif
-#if !defined(NS_MAXCDNAME) && defined (MAXCDNAME)
-#define NS_MAXCDNAME MAXCDNAME
-#endif
-#if !defined(NS_INT16SZ) && defined(INT16SZ)
-#define NS_INT16SZ INT16SZ
-#define NS_INT32SZ INT32SZ
-#endif
-#ifndef NS_GET16
-#  define NS_GET16 GETSHORT
-#endif
-
-/** END:some missing macros on OpenBSD 3.9 */
-
-/*
- * 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.
-	 *
-	 * Other code here, such as the RBL check, will expect IPv4 addresses to be represented
-	 * as dotted-quad, even if they come in over a hybrid IPv6/IPv4 socket.
-	 */
-	if ( (strlen(abuf) > 7) && (!strncasecmp(abuf, "::ffff:", 7)) ) {
-		if (!strcmp(abuf, tbuf)) strcpy(tbuf, &tbuf[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;
-	static int res_initted = 0;
-
-	if (!res_initted) {		/* only have to do this once */
-		res_init();
-		res_initted = 1;
-	}
-
-	/* Make our DNS query. */
-	answer = fixedans;
-	if (server_shutting_down)
-	{
-		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 (server_shutting_down)
-	{
-		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.
-	 */
-	len = res_query(domain, C_IN, T_TXT, answer, PACKETSZ);
-	if (server_shutting_down)
-	{
-		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) {
-		long len;
-		len = snprintf(txtbuf, txtbufsize, "%s", result);
-	
-		/* Remove nonprintable characters */
-		for (p = txtbuf; *p != '\0'; p++) {
-			if (!isprint(*p)) {
-				memmove (p,
-					 p + 1,
-					 len - (p - txtbuf) - 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'
- */
-int rbl_check(char *message_to_spammer)
-{
-	char tbuf[256] = "";
-	int suffix_pos = 0;
-	int rbl;
-	int num_rbl;
-	char rbl_domains[SIZ];
-	char txt_answer[1024];
-
-	strcpy(message_to_spammer, "ok");
-
-	if ((strchr(CC->cs_addr, '.')) && (!strchr(CC->cs_addr, ':'))) {
-		int a1, a2, a3, a4;
-
-		sscanf(CC->cs_addr, "%d.%d.%d.%d", &a1, &a2, &a3, &a4);
-		snprintf(tbuf, sizeof tbuf, "%d.%d.%d.%d.", a4, a3, a2, a1);
-		suffix_pos = strlen(tbuf);
-	}
-	else if ((!strchr(CC->cs_addr, '.')) && (strchr(CC->cs_addr, ':'))) {
-		int num_colons = 0;
-		int i = 0;
-		char workbuf[sizeof tbuf];
-		char *ptr;
-
-		/* tedious code to expand and reverse an IPv6 address */
-		safestrncpy(tbuf, CC->cs_addr, sizeof tbuf);
-		num_colons = haschar(tbuf, ':');
-		if ((num_colons < 2) || (num_colons > 7)) return(0);	/* badly formed address */
-
-		/* expand the "::" shorthand */
-		while (num_colons < 7) {
-			ptr = strstr(tbuf, "::");
-			if (!ptr) return(0);				/* badly formed address */
-			++ptr;
-			strcpy(workbuf, ptr);
-			strcpy(ptr, ":");
-			strcat(ptr, workbuf);
-			++num_colons;
-		}
-
-		/* expand to 32 hex characters with no colons */
-		strcpy(workbuf, tbuf);
-		strcpy(tbuf, "00000000000000000000000000000000");
-		for (i=0; i<8; ++i) {
-			char tokbuf[5];
-			extract_token(tokbuf, workbuf, i, ':', sizeof tokbuf);
-
-			memcpy(&tbuf[ (i*4) + (4-strlen(tokbuf)) ], tokbuf, strlen(tokbuf) );
-		}
-		if (strlen(tbuf) != 32) return(0);
-
-		/* now reverse it and add dots */
-		strcpy(workbuf, tbuf);
-		for (i=0; i<32; ++i) {
-			tbuf[i*2] = workbuf[31-i];
-			tbuf[(i*2)+1] = '.';
-		}
-		tbuf[64] = 0;
-		suffix_pos = 64;
-	}
-	else {
-		return(0);	/* unknown address format */
-	}
-
-	/* 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) {
-                extract_token(&tbuf[suffix_pos], rbl_domains, rbl, '|', (sizeof tbuf - suffix_pos));
-
-		if (rblcheck_backend(tbuf, txt_answer, sizeof txt_answer)) {
-			strcpy(message_to_spammer, txt_answer);
-			syslog(LOG_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.
- *
- * FIXME this is obviously not IPv6 compatible.
- */
-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);
-}