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/* This file is part of mailfromd.
Copyright (C) 2007 Sergey Poznyakoff
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#define SPF_MAX_TXT_REC 10
#define SPF_MAX_RECURSION 10
typedef enum spf_result {
spf_none,
spf_neutral,
spf_pass,
spf_fail,
spf_soft_fail,
spf_temp_error,
spf_perm_error
#define max_spf_result (spf_perm_error+1)
} spf_result;
typedef struct {
const char *ipstr; /* Originator IP in textual form */
const char *domain; /* Sender domain */
const char *sender; /* Sender email */
const char *helo_domain; /* HELO domain */
const char *my_domain; /* My own domain name */
const char *exp_prefix; /* Explanation prefix (optional) */
} spf_query_t;
typedef struct {
unsigned long ttl; /* Minimal ttl */
char *exp_text; /* Explanation text */
char *mech; /* SPF mechanism that decided about the result */
} spf_answer_t;
spf_result spf_check_host(spf_query_t *query, spf_answer_t *ans);
spf_result spf_test_record(const char *rec,
spf_query_t *query, spf_answer_t *ans);
dns_status spf_lookup(const char *domain, char **txt, size_t maxtxt,
unsigned long *ttl, char *answer, size_t answer_size);
void spf_answer_free(spf_answer_t *ans);
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