* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
-#ifdef HAVE_GETHOSTBYNAME
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-#include "i18n.h"
-#include "mx.h"
-#include "fetchmail.h"
-
-#define MX_RETRIES 3
-
-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.
- */
-{
- typedef unsigned char address_t[sizeof (struct in_addr)];
- typedef struct _address_e
- {
- struct _address_e *next;
- address_t address;
- }
- address_e;
- address_e *host_a_addr=0, *host_b_addr=0; /* assignments pacify -Wall */
- address_e *dummy_addr;
-
- int i;
- struct hostent *hp;
- char **p;
-
- hp = gethostbyname(name1);
-
- dummy_addr = (address_e *)NULL;
-
- for (i=0,p = hp->h_addr_list; *p != 0; i++,p++)
- {
- struct in_addr in;
- (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr));
- xalloca(host_a_addr, address_e *, sizeof (address_e));
- memset (host_a_addr,0, sizeof (address_e));
- host_a_addr->next = dummy_addr;
- (void) memcpy(&host_a_addr->address, *p, sizeof (in.s_addr));
- dummy_addr = host_a_addr;
- }
-
- hp = gethostbyname(name2);
-
- dummy_addr = (address_e *)NULL;
- for (i=0,p = hp->h_addr_list; *p != 0; i++,p++)
- {
- struct in_addr in;
- (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr));
- xalloca(host_b_addr, address_e *, sizeof (address_e));
- memset (host_b_addr,0, sizeof (address_e));
- host_b_addr->next = dummy_addr;
- (void) memcpy(&host_b_addr->address, *p, sizeof (in.s_addr));
- dummy_addr = host_b_addr;
- }
-
- while (host_a_addr)
- {
- while (host_b_addr)
- {
- if (!memcmp(host_b_addr->address,host_a_addr->address, sizeof (address_t)))
- return (TRUE);
- host_b_addr = host_b_addr->next;
- }
- host_a_addr = host_a_addr->next;
- }
- return (FALSE);
-}
+#include "fetchmail.h"
-int is_host_alias(const char *name, struct query *ctl)
+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 */
{
- struct hostent *he,*he_st;
- struct mxentry *mxp, *mxrecords;
+ struct idlist *idl;
+ size_t namelen;
- struct hostdata *lead_server =
+ struct hostdata *lead_server =
ctl->server.lead_server ? ctl->server.lead_server : &ctl->server;
/*
* many cases.
*
* (1) check against the `true name' deduced from the poll label
- * and the via option (if present) at the beginning of the poll cycle.
+ * and the via option (if present) at the beginning of the poll cycle.
* Odds are good this will either be the mailserver's FQDN or a suffix of
* it with the mailserver's domain's default host name omitted.
*
return(TRUE);
else if (str_in_list(&lead_server->akalist, name, TRUE))
return(TRUE);
- else if (!ctl->server.dns)
- return(FALSE);
-#ifndef HAVE_RES_SEARCH
- 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.
+ * Now check for a suffix match on the akalist. The theory here is
+ * that if the user says `aka netaxs.com', we actually want to match
+ * foo.netaxs.com and bar.netaxs.com.
*/
- else if ((he = gethostbyname(name)) != (struct hostent *)NULL)
+ namelen = strlen(name);
+ for (idl = lead_server->akalist; idl; idl = idl->next)
{
- if (strcasecmp(ctl->server.truename, he->h_name) == 0)
- goto match;
- else if (((he_st = gethostbyname(ctl->server.truename)) != (struct hostent *)NULL) && ctl->server.checkalias)
- {
- if (outlevel >= O_DEBUG)
- report(stdout, _("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, _("Yes, their IP addresses match\n"));
- goto match;
- }
- if (outlevel >= O_DEBUG)
- report(stdout, _("No, their IP addresses don't match\n"));
- }
- else
- return(FALSE);
+ const char *ep;
+
+ /*
+ * Test is >= here because str_in_list() should have caught the
+ * equal-length case above. Doing it this way guarantees that
+ * ep[-1] is a valid reference.
+ */
+ if (strlen(idl->id) >= namelen)
+ continue;
+ ep = name + (namelen - strlen(idl->id));
+ /* a suffix led by . must match */
+ if (ep[-1] == '.' && !strcasecmp(ep, idl->id))
+ return(TRUE);
}
- else
- switch (h_errno)
- {
- case HOST_NOT_FOUND: /* specified host is unknown */
- case NO_ADDRESS: /* valid, but does not have an IP address */
- break;
-
- case NO_RECOVERY: /* non-recoverable name server error */
- case TRY_AGAIN: /* temporary error on authoritative server */
- default:
- if (outlevel != O_SILENT)
- report_complete(stdout, "\n"); /* terminate the progress message */
- report(stderr,
- _("nameserver failure while looking for `%s' during poll of %s.\n"),
- name, ctl->server.pollname);
- 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 */
- case NO_ADDRESS: /* valid, but does not have an IP address */
- return(FALSE);
- break;
- case NO_RECOVERY: /* non-recoverable name server error */
- case TRY_AGAIN: /* temporary error on authoritative server */
- default:
- report(stderr,
- _("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)
- goto match;
+ if (!ctl->server.dns)
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 */
+ (void)res;
+ return(FALSE);
}
-#endif /* HAVE_GETHOSTBYNAME */
/* checkalias.c ends here */
projects / ~andy / fetchmail / blobdiff