+++ /dev/null
-/*
- * $Id$
- *
- * 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
-
-
-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 a host is on some sort of spam list (RBL)
- * If spammer, returns nonzero and places reason in 'message_to_spammer'
- */
-int rbl_check_addr(struct in_addr *addr, 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];
- char dotted_quad[32];
-
- strcpy(message_to_spammer, "ok");
- safestrncpy(dotted_quad, inet_ntoa(*addr), sizeof dotted_quad);
- sscanf(dotted_quad, "%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);
-}
-
-
-/*
- * 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'
- *
- * PORTABILITY NOTE! I've made my best effort to rewrite this in a portable fashion.
- * If anyone makes changes to this function, please shout-out so we can test it to
- * make sure it didn't break on Linux!
- */
-int rbl_check(char *message_to_spammer) {
- int r;
- struct sockaddr_in peer;
- socklen_t peer_len = 0;
-
- peer_len = sizeof(peer);
- r = getpeername(CC->client_socket, &peer, &peer_len);
- if (r == 0) {
- return(rbl_check_addr(&peer.sin_addr, message_to_spammer));
- }
- else {
- CtdlLogPrintf(CTDL_INFO, "RBL getpeername() failed: %s\n", strerror(errno));
- }
- 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);
-}
projects / citadel.git / blobdiff