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/** |
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* ns_mxcheck.C: Check MX records for registering email. |
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* |
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* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team |
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* Rights to this code are as documented in COPYING. |
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* |
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* |
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* Portions of this file were derived from sources bearing the following license: |
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* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team |
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* Copyright © 2007 Atheme Development Group |
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* Rights to this code are as documented in doc/pod/license.pod. |
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* |
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* $Id: ns_mxcheck.C,v 1.3 2007-08-30 19:56:22 pippijn Exp $ |
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*/ |
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|
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#include <netinet/in.h> |
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#include <arpa/nameser.h> |
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#include <resolv.h> |
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#include <netdb.h> |
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|
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#include "atheme.h" |
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#include <ermyth/module.h> |
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|
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static char const rcsid[] = "$Id: ns_mxcheck.C,v 1.3 2007-08-30 19:56:22 pippijn Exp $"; |
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|
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REGISTER_MODULE ("nickserv/mxcheck", false, "Jamie L. Penman-Smithson <jamie@slacked.org>"); |
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|
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static int |
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count_mx (char const * const host) |
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{ |
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u_char nsbuf[4096]; |
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ns_msg amsg; |
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int l; |
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|
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l = res_query (host, ns_c_any, ns_t_mx, nsbuf, sizeof (nsbuf)); |
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|
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if (l < 0) |
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return 0; |
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|
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ns_initparse (nsbuf, l, &amsg); |
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l = ns_msg_count (amsg, ns_s_an); |
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|
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return l; |
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} |
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|
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static bool |
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check_registration (sourceinfo_t *si, char const * const account, char const * const email) |
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{ |
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char buf[1024]; |
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int count; |
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|
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strlcpy (buf, email, sizeof buf); |
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/* char const * const user = */strtok (buf, "@"); |
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char const * const domain = strtok (NULL, "@"); |
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count = count_mx (domain); |
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|
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if (count > 0) |
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/* there are MX records for this domain */ |
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snoop ("REGISTER: mxcheck: %d MX records for %s", count, domain); |
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else |
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{ |
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/* no MX records or error */ |
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struct hostent *host; |
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|
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/* attempt to resolve host (fallback to A) */ |
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if ((host = gethostbyname (domain)) == NULL) |
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{ |
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snoop ("REGISTER: mxcheck: no A/MX records for %s - " |
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"REGISTER failed", domain); |
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command_fail (si, fault::noprivs, "Sorry, \2%s\2 does not exist, " |
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"I can't send mail there. Please check and try again.", domain); |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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bool |
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_modinit (module *m) |
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{ |
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user_t::callback.can_register.attach (check_registration); |
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|
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return true; |
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} |
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|
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void |
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_moddeinit (void) |
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{ |
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user_t::callback.can_register.detach (check_registration); |
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} |
