#include <stdio.h>
#include <string.h>
#include <sys/types.h>
-#ifdef HAVE_NET_SOCKET_H
-#include <net/socket.h>
-#else
-#include <sys/socket.h>
-#endif
-#include <netinet/in.h>
-#ifdef HAVE_ARPA_INET_H
-#include <arpa/inet.h>
-#endif
-#include <netdb.h>
-#include "i18n.h"
-#include "mx.h"
-#include "fetchmail.h"
-#include "getaddrinfo.h"
-
-#define MX_RETRIES 3
-
-typedef unsigned char address_t[sizeof (struct in_addr)];
-
-#ifdef HAVE_RES_SEARCH
-static int getaddresses(struct addrinfo **result, const char *name)
-{
- struct addrinfo hints;
-
- memset(&hints, 0, sizeof(hints));
- hints.ai_socktype=SOCK_STREAM;
- hints.ai_protocol=PF_UNSPEC;
- hints.ai_family=AF_UNSPEC;
- return fm_getaddrinfo(name, NULL, &hints, result);
-}
-
-/* XXX FIXME: doesn't detect if an IPv6-mapped IPv4 address
- * matches a real IPv4 address */
-static int compareaddr(const struct addrinfo *a1, const struct addrinfo *a2)
-{
- if (a1->ai_family != a2->ai_family) return FALSE;
- if (a1->ai_addrlen != a2->ai_addrlen) return FALSE;
- return (!memcmp(a1->ai_addr, a2->ai_addr, a1->ai_addrlen));
-}
-
-static int is_ip_alias(const char *name1,const char *name2)
-/*
- * Given two hostnames as arguments, returns TRUE if they
- * have at least one IP address in common.
- * No check is done on errors returned by gethostbyname,
- * the calling function does them.
- */
-{
- int rc = FALSE;
- struct addrinfo *res1 = NULL, *res2 = NULL, *ii, *ij;
-
- if (getaddresses(&res1, name1))
- goto found;
-
- if (getaddresses(&res2, name2))
- goto found;
-
- for (ii = res1 ; ii ; ii = ii -> ai_next) {
- for (ij = res2 ; ij ; ij = ij -> ai_next) {
- if (compareaddr(ii, ij)) {
- rc = TRUE;
- goto found;
- }
- }
- }
-
-found:
- if (res2)
- fm_freeaddrinfo(res2);
- if (res1)
- fm_freeaddrinfo(res1);
- return rc;
-}
-#endif
+#include "fetchmail.h"
int is_host_alias(const char *name, struct query *ctl, struct addrinfo **res)
/* determine whether name is a DNS alias of the mailserver for this query */
{
-#ifdef HAVE_RES_SEARCH
- struct mxentry *mxp, *mxrecords;
- int e;
- struct addrinfo hints, *res_st;
-#endif
struct idlist *idl;
size_t namelen;
if (!ctl->server.dns)
return(FALSE);
-#ifndef HAVE_RES_SEARCH
(void)res;
return(FALSE);
-#else
- /*
- * The only code that calls the BIND library is here and in the
- * start-of-run probe with gethostbyname(3) under ETRN/Kerberos.
- *
- * We know DNS service was up at the beginning of the run.
- * If it's down, our nameserver has crashed. We don't want to try
- * delivering the current message or anything else from the
- * current server until it's back up.
- */
- memset(&hints, 0, sizeof hints);
- hints.ai_family=AF_UNSPEC;
- hints.ai_protocol=PF_UNSPEC;
- hints.ai_socktype=SOCK_STREAM;
- hints.ai_flags=AI_CANONNAME;
-
- e = fm_getaddrinfo(name, NULL, &hints, res);
- if (e == 0)
- {
- int rr = (strcasecmp(ctl->server.truename, (*res)->ai_canonname) == 0);
- fm_freeaddrinfo(*res); *res = NULL;
- if (rr)
- goto match;
- else if (ctl->server.checkalias && 0 == fm_getaddrinfo(ctl->server.truename, NULL, &hints, &res_st))
- {
- fm_freeaddrinfo(res_st);
- if (outlevel >= O_DEBUG)
- report(stdout, GT_("Checking if %s is really the same node as %s\n"),ctl->server.truename,name);
- if (is_ip_alias(ctl->server.truename,name) == TRUE)
- {
- if (outlevel >= O_DEBUG)
- report(stdout, GT_("Yes, their IP addresses match\n"));
- goto match;
- }
- if (outlevel >= O_DEBUG)
- report(stdout, GT_("No, their IP addresses don't match\n"));
- return(FALSE);
- } else {
- return(FALSE);
- }
- }
- else
- switch (e)
- {
- case EAI_NONAME: /* specified host is unknown */
- break;
-
- default:
- if (outlevel != O_SILENT)
- report_complete(stdout, "\n"); /* terminate the progress message */
- report(stderr,
- GT_("nameserver failure while looking for '%s' during poll of %s: %s\n"),
- name, ctl->server.pollname, gai_strerror(e));
- ctl->errcount++;
- break;
- }
-
- /*
- * We're only here if DNS was OK but the gethostbyname() failed
- * with a HOST_NOT_FOUND or NO_ADDRESS error.
- * Search for a name match on MX records pointing to the server.
- */
- h_errno = 0;
- if ((mxrecords = getmxrecords(name)) == (struct mxentry *)NULL)
- {
- switch (h_errno)
- {
- case HOST_NOT_FOUND: /* specified host is unknown */
-#ifdef NO_ADDRESS
- case NO_ADDRESS: /* valid, but does not have an IP address */
- return(FALSE);
-#endif
- case NO_RECOVERY: /* non-recoverable name server error */
- case TRY_AGAIN: /* temporary error on authoritative server */
- default:
- report(stderr,
- GT_("nameserver failure while looking for `%s' during poll of %s.\n"),
- name, ctl->server.pollname);
- ctl->errcount++;
- break;
- }
- } else {
- for (mxp = mxrecords; mxp->name; mxp++)
- if (strcasecmp(ctl->server.truename, mxp->name) == 0
- || is_ip_alias(ctl->server.truename, mxp->name) == TRUE)
- goto match;
- return(FALSE);
- match:;
- }
-
- /* add this name to relevant server's `also known as' list */
- save_str(&lead_server->akalist, name, 0);
- return(TRUE);
-#endif /* HAVE_RES_SEARCH */
}
/* checkalias.c ends here */
projects / ~andy / fetchmail / blobdiff