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opendmarc_spf.c
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/********************************************************************
** OPENDMARC_SPF.C -- Process the spf record of the inbound message
**********************************************************************/
# include "opendmarc_internal.h"
/* libbsd if found */
#ifdef USE_BSD_H
# include <bsd/string.h>
#endif /* USE_BSD_H */
/* libstrl if needed */
#ifdef USE_STRL_H
# include <strl.h>
#endif /* USE_STRL_H */
/* opendmarc_strl if needed */
#ifdef USE_DMARCSTRL_H
# include <opendmarc_strl.h>
#endif /* USE_DMARCSTRL_H */
# include "dmarc.h"
#if WITH_SPF
#if HAVE_SPF2_H
// Here we have spf.h, so libspf2 is available.
SPF_CTX_T *
opendmarc_spf2_alloc_ctx()
{
SPF_CTX_T *spfctx = NULL;
spfctx = malloc(sizeof(SPF_CTX_T));
if (spfctx == NULL)
return NULL;
(void) memset(spfctx, '\0', sizeof(SPF_CTX_T));
spfctx->spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
spfctx->spf_request = SPF_request_new(spfctx->spf_server);
return spfctx;
}
SPF_CTX_T *
opendmarc_spf2_free_ctx(SPF_CTX_T *spfctx)
{
if (spfctx == NULL)
return spfctx;
if (spfctx->spf_response != NULL)
SPF_response_free(spfctx->spf_response);
if (spfctx->spf_request != NULL)
SPF_request_free(spfctx->spf_request);
if (spfctx->spf_server != NULL)
SPF_server_free(spfctx->spf_server);
(void) free(spfctx);
spfctx = NULL;
return spfctx;
}
int
opendmarc_spf2_find_mailfrom_domain(SPF_CTX_T *spfctx, char *raw_address, char *mailfrom, size_t mailfrom_len, int *use_flag)
{
char copy[sizeof spfctx->mailfrom_addr];
char *cp;
char *ep;
if (use_flag != NULL)
*use_flag = FALSE;
if (spfctx == NULL)
return EINVAL;
if (mailfrom == NULL || raw_address == NULL)
return EINVAL;
(void) memset(copy, '\0', sizeof copy);
(void) strlcpy(copy, raw_address, sizeof copy);
cp = strrchr(copy, '<');
if (cp == NULL)
cp = copy;
else
++cp;
ep = strchr(cp, '>');
if (ep != NULL)
*ep = '\0';
ep = strchr(cp, '@');
if (ep != NULL)
{
cp = ep+1;
if (use_flag != NULL)
*use_flag = TRUE;
}
if (strcasecmp(cp, "MAILER_DAEMON") == 0)
cp = "";
(void) memset(mailfrom, '\0', mailfrom_len);
(void) strlcpy(mailfrom, cp, mailfrom_len);
return 0;
}
int
opendmarc_spf2_specify_ip_address(SPF_CTX_T *spfctx, char *ip_address, size_t ip_address_len)
{
if (spfctx == NULL)
return EINVAL;
if (ip_address == NULL)
return EINVAL;
/*
* we don't care at this point if it is ipv6 or ipv4
*/
SPF_request_set_ipv4_str(spfctx->spf_request, ip_address);
SPF_request_set_ipv6_str(spfctx->spf_request, ip_address);
return 0;
}
int
opendmarc_spf2_test(char *ip_address, char *mail_from_domain, char *helo_domain, char *spf_record, int softfail_okay_flag, char *human_readable, size_t human_readable_len, int *used_mfrom)
{
SPF_CTX_T * ctx;
int ret;
char xbuf[BUFSIZ];
char helo[512];
char mfrom[512];
if (used_mfrom != NULL)
*used_mfrom = FALSE;
(void) memset(xbuf, '\0', sizeof xbuf);
ctx = opendmarc_spf2_alloc_ctx();
if (ctx == NULL)
{
if (human_readable != NULL)
(void) strlcpy(human_readable, strerror(errno), human_readable_len);
return DMARC_POLICY_SPF_OUTCOME_TMPFAIL;
}
if (ip_address == NULL)
{
if (human_readable != NULL)
(void) strlcpy(human_readable, "No IP address available", human_readable_len);
ctx = opendmarc_spf2_free_ctx(ctx);
return DMARC_POLICY_SPF_OUTCOME_FAIL;
}
if (mail_from_domain == NULL && helo_domain == NULL)
{
if (human_readable != NULL)
(void) strlcpy(human_readable, "No Domain name available to check", human_readable_len);
ctx = opendmarc_spf2_free_ctx(ctx);
return DMARC_POLICY_SPF_OUTCOME_FAIL;
}
ret = opendmarc_spf2_specify_ip_address(ctx, ip_address, strlen(ip_address));
if (ret != 0)
{
if (human_readable != NULL)
(void) strlcpy(human_readable, strerror(errno), human_readable_len);
ctx = opendmarc_spf2_free_ctx(ctx);
return DMARC_POLICY_SPF_OUTCOME_TMPFAIL;
}
ret = opendmarc_spf2_find_mailfrom_domain(ctx, mail_from_domain, mfrom, sizeof mfrom, used_mfrom);
if (ret != 0 || *used_mfrom == FALSE)
{
(void) strlcpy(helo, helo_domain, sizeof helo);
SPF_request_set_helo_dom(ctx->spf_request, helo);
}
else
{
SPF_request_set_env_from(ctx->spf_request, mfrom);
}
ctx->spf_response = NULL;
SPF_request_query_mailfrom(ctx->spf_request, &(ctx->spf_response));
if (human_readable != NULL)
(void) strlcpy(human_readable, SPF_strresult(SPF_response_result(ctx->spf_response)), human_readable_len);
ctx->spf_result = SPF_response_result(ctx->spf_response);
ret = (int) ctx->spf_result;
ctx = opendmarc_spf2_free_ctx(ctx);
if (ret != SPF_RESULT_PASS)
{
switch (ret)
{
case SPF_RESULT_NONE:
return DMARC_POLICY_SPF_OUTCOME_NONE;
case SPF_RESULT_NEUTRAL:
case SPF_RESULT_SOFTFAIL:
if (softfail_okay_flag == TRUE)
return DMARC_POLICY_SPF_OUTCOME_PASS;
else
return DMARC_POLICY_SPF_OUTCOME_FAIL;
break;
case SPF_RESULT_TEMPERROR:
return DMARC_POLICY_SPF_OUTCOME_TMPFAIL;
}
return DMARC_POLICY_SPF_OUTCOME_FAIL;
}
return DMARC_POLICY_SPF_OUTCOME_PASS;
}
#else /* HAVE_SPF2_H */
// No spf.h so no libspf2 to use so we use the internal spf check.
#ifndef TRUE
# define TRUE (1)
#endif
#ifndef FALSE
# define FALSE (0)
#endif
#ifndef MAXDNSHOSTNAME
# define MAXDNSHOSTNAME (256)
#endif
#define SPF_MAX_SPF_RECORD_LEN (4096)
#define SPF_IN_TOKEN_NONE (0)
#define SPF_IN_TOKEN_VERSION (1)
#define SPF_IN_TOKEN_A (2)
#define SPF_IN_TOKEN_MX (3)
#define SPF_IN_TOKEN_IP4 (4)
#define SPF_IN_TOKEN_IP6 (5)
#define SPF_IN_TOKEN_PTR (6)
#define SPF_IN_TOKEN_INCLUDE (7)
#define SPF_IN_TOKEN_REDIRECT (8)
#define SPF_IN_TOKEN_EXISTS (9)
#define SPF_IN_TOKEN_EXP (10)
const char *
opendmarc_spf_status_to_msg(SPF_CTX_T *spfctx, int status)
{
const char *r;
if (status != 0 && spfctx != NULL && spfctx->did_get_exp)
return spfctx->exp_buf;
switch (status)
{
#define SPF_RETURN_UNDECIDED (-1)
case SPF_RETURN_UNDECIDED:
r = "Undecided";
break;
#define SPF_RETURN_OK_PASSED (0)
case SPF_RETURN_OK_PASSED:
r = "Passed";
break;
#define SPF_RETURN_INTERNAL (5)
case SPF_RETURN_INTERNAL:
r = "No Domain To Check";
break;
#define SPF_RETURN_RECORD_TOOLONG (6)
case SPF_RETURN_RECORD_TOOLONG:
r = "Record Too Big";
break;
#define SPF_RETURN_BAD_SYNTAX_VERSION (7)
case SPF_RETURN_BAD_SYNTAX_VERSION:
r = "Bad Version";
break;
#define SPF_RETURN_A_BUT_NO_A_RECORD (8)
case SPF_RETURN_A_BUT_NO_A_RECORD:
r = "Required 'A' lookup failed to find 'A' records";
break;
#define SPF_RETURN_DASH_FORCED_HARD_FAIL (9)
case SPF_RETURN_DASH_FORCED_HARD_FAIL:
r = "Required 'A' bu no 'A' records with -a specified";
break;
#define SPF_RETURN_A_BUT_BAD_SYNTAX (10)
case SPF_RETURN_A_BUT_BAD_SYNTAX:
r = "IP Address Badly Formed";
break;
#define SPF_RETURN_BAD_SYNTAX_INCLUDE (11)
case SPF_RETURN_BAD_SYNTAX_INCLUDE:
r = "'INCLUDE' Syntax Error";
break;
#define SPF_RETURN_INCLUDE_NO_DOMAIN (12)
case SPF_RETURN_INCLUDE_NO_DOMAIN:
r = "'INCLUDE' Domain Lookup Failed";
break;
#define SPF_RETURN_BAD_SYNTAX_REDIRECT (13)
case SPF_RETURN_BAD_SYNTAX_REDIRECT:
r = "'REDIRECT' Syntax Error";
break;
#define SPF_RETURN_REDIRECT_NO_DOMAIN (14)
case SPF_RETURN_REDIRECT_NO_DOMAIN:
r = "'REDIRECT' Domain Lookup Failed";
break;
#define SPF_RETURN_DASH_ALL_HARD_FAIL (15)
case SPF_RETURN_DASH_ALL_HARD_FAIL:
r = "Hard Fail: Reject";
break;
#define SPF_RETURN_TILDE_ALL_SOFT_FAIL (16)
case SPF_RETURN_TILDE_ALL_SOFT_FAIL:
r = "Soft Fail: Subject to Policy";
break;
#define SPF_RETURN_QMARK_ALL_NEUTRAL (17)
case SPF_RETURN_QMARK_ALL_NEUTRAL:
r = "Neutral Fail: Subject to Policy";
break;
#define SPF_RETURN_UNKNOWN_KEYWORD (18)
case SPF_RETURN_UNKNOWN_KEYWORD:
r = "Unrecognized Keyword";
break;
#define SPF_RETURN_BAD_MACRO_SYNTAX (19)
case SPF_RETURN_BAD_MACRO_SYNTAX:
r = "Macros Used But Syntax Bad";
break;
#define SPF_RETURN_NOT_EXISTS_HARDFAIL (20)
case SPF_RETURN_NOT_EXISTS_HARDFAIL:
r = "'A' Record lookup, No Such Host";
break;
#define SPF_RETURN_BAD_SYNTAX_EXISTS (21)
case SPF_RETURN_BAD_SYNTAX_EXISTS:
r = "'EXISTS' Omitted A domain";
break;
#define SPF_RETURN_BAD_SYNTAX_EXP (22)
case SPF_RETURN_BAD_SYNTAX_EXP:
r = "'EXP' Bad Syntax";
break;
#define SPF_RETURN_NOT_EXP_HARDFAIL (23)
case SPF_RETURN_NOT_EXP_HARDFAIL:
r = "'-EXP' Hard Failure";
break;
#define SPF_RETURN_TOO_MANY_DNS_QUERIES (24)
case SPF_RETURN_TOO_MANY_DNS_QUERIES:
r = "Too Many DNS Lookups Without Success.";
break;
default:
#define SPF_RETURN_INTERNAL_ERROR (25)
r = "Undefined Internal Error";
break;
}
return r;
}
/****************************************************************
** SPF_STATUS_TO_PASS -- convert ctx->status into a decision
** Returns 1 for pass
** Returns 0 for fail
** Returns -1 for maybe fail (~all means you decide)
****************************************************************/
int
opendmarc_spf_status_to_pass(int status, int none_pass)
{
int r;
switch (status)
{
case SPF_RETURN_UNDECIDED:
if (none_pass == 1)
r = 1;
else
r = 0;
break;
case SPF_RETURN_OK_PASSED:
r = 1;
break;
case SPF_RETURN_INTERNAL:
r = 0;
break;
case SPF_RETURN_RECORD_TOOLONG:
r = 0;
break;
case SPF_RETURN_BAD_SYNTAX_VERSION:
r = 0;
break;
case SPF_RETURN_A_BUT_NO_A_RECORD:
r = 0;
break;
case SPF_RETURN_DASH_FORCED_HARD_FAIL:
r = 0;
break;
case SPF_RETURN_A_BUT_BAD_SYNTAX:
r = 0;
break;
case SPF_RETURN_BAD_SYNTAX_INCLUDE:
r = 0;
break;
case SPF_RETURN_INCLUDE_NO_DOMAIN:
r = 0;
break;
case SPF_RETURN_BAD_SYNTAX_REDIRECT:
r = 0;
break;
case SPF_RETURN_REDIRECT_NO_DOMAIN:
r = 0;
break;
case SPF_RETURN_DASH_ALL_HARD_FAIL:
r = 0;
break;
case SPF_RETURN_TILDE_ALL_SOFT_FAIL:
r = -1;
break;
case SPF_RETURN_QMARK_ALL_NEUTRAL:
r = 1;
break;
case SPF_RETURN_UNKNOWN_KEYWORD:
r = 0;
break;
case SPF_RETURN_BAD_MACRO_SYNTAX:
r = 0;
break;
case SPF_RETURN_NOT_EXISTS_HARDFAIL:
r = 0;
break;
case SPF_RETURN_BAD_SYNTAX_EXISTS:
r = 0;
break;
case SPF_RETURN_BAD_SYNTAX_EXP:
r = 0;
break;
case SPF_RETURN_TOO_MANY_DNS_QUERIES:
r = 0;
break;
case SPF_RETURN_INTERNAL_ERROR:
r = 0;
break;
default:
r = 0;
break;
}
return r;
}
int
opendmarc_spf_cidr_address(u_long ip, char *cidr_addr)
{
char *cidr;
char *cp, *ep;
char buf[BUFSIZ];
u_long i;
u_long bits;
u_long mask;
u_long high, low;
struct sockaddr_in sin;
if (cidr_addr == NULL)
return FALSE;
(void) memset(buf, '\0', sizeof buf);
(void) strlcpy(buf, cidr_addr, sizeof buf);
cidr = strchr(buf, '/');
if (cidr == NULL)
{
if (inet_aton(cidr_addr, &sin.sin_addr) != 0)
{
(void)memcpy(&low, &sin.sin_addr, sizeof(sin.sin_addr));
(void)memcpy(&high, &sin.sin_addr, sizeof(sin.sin_addr));
if (ip >= low && ip <= high)
return TRUE;
}
return FALSE;
}
*cidr++ = '\0';
bits = strtoul(cidr, NULL, 10);
cp = buf;
ep = strchr(buf, '.');
if (ep == NULL)
return FALSE;
*ep++ = '\0';
i = strtoul(cp, NULL, 10) << 24;
cp = ep;
ep = strchr(cp, '.');
if (ep == NULL)
return FALSE;
*ep++ = '\0';
i += strtoul(cp, NULL, 10) << 16;
cp = ep;
ep = strchr(cp, '.');
if (ep == NULL)
return FALSE;
*ep++ = '\0';
i += strtoul(cp, NULL, 10) << 8;
cp = ep;
i += strtoul(cp, NULL, 10);
mask = (bits == 0) ? 0 : ~(u_long)0 << (32 - bits);
low = i & mask;
high = i | (~mask & 0xFFFFFFFF);
if (ip >= low && ip <= high)
return TRUE;
return FALSE;
}
/**************************************************************
** opendmarc_spf_reverse -- Reverse doman name on dot or ip address
** on dot or colon boundaries
** e.g. a.b.c becomes c.b.a
** and FFFF::EEEE becomes EEEE::FFFF
** and 12.34.56.78 becomes 78.56.34.12
** Input:
** str -- the string to reverse
** buf -- buffer to hold the reversed string
** buflen -- size in bytes of the buffer
** Returns:
** NULL On error
** buf On success
** Side Effects:
** Overwrites previous contents of buf
****************************************************************/
static char *
opendmarc_spf_reverse(char *str, char *buf, size_t buflen)
{
char * sp;
char * ep;
char * dotp;
int dotorcolon = 0;
char dotorcolon_str[2];
char dupe[BUFSIZ];
if (str == NULL || buf == NULL || buflen == 0)
return NULL;
if (buflen > BUFSIZ)
buflen = BUFSIZ;
(void) memset(buf, '\0', buflen);
(void) memset(dupe, '\0', buflen + 1);
(void) strlcpy(dupe, str, buflen + 1);
dotp = strchr(dupe, '.');
if (dotp != NULL)
dotorcolon = ',';
else
{
dotp = strchr(dupe, ':');
if (dotp != NULL)
dotorcolon = ':';
}
if (dotorcolon == 0)
return NULL;
dotorcolon_str[0] = dotorcolon;
dotorcolon_str[1] = '\0';
ep = dupe + strlen(dupe);
/*
* strip tailing dotorcolons.
*/
do
{
for (sp = ep; sp >= dupe; --sp)
if (*sp == dotorcolon)
break;
if (sp < dupe)
{
strlcat(buf, sp+1, buflen);
break;
}
ep = sp;
if (*sp == dotorcolon)
++sp;
if (*sp != '\0')
strlcat(buf, sp, buflen);
if (*ep == dotorcolon)
{
strlcat(buf, dotorcolon_str, buflen);
*ep = '\0';
--ep;
}
} while (sp >= dupe);
return buf;
}
typedef struct {
u_int values[8];
int nvalues;
} INT_ARY_T;
typedef struct {
char strs[8][32];
int nstrs;
} TXT_ARY_T;
static int
opendmarc_spf_ipv6_cidr_populate(TXT_ARY_T *lp, INT_ARY_T *ap)
{
int i, f;
int dots;
/*
* Populate the base, expected variations are:
* ::ipv4
* :FFFF:ipv4
* :hex::hex: ...
*/
/* Clear to zero in case we got an auto array */
for (i = 0; i < 8; ++i)
ap->values[i] = 0;
f = 0; /* index into the output array of values. */
for (i = 0; i < lp->nstrs; ++i)
{
int value;
int value2;
char *cp = NULL;
dots = 0;
if (i == 0)
{
char *dp;
/*
* The rightmost address might be IPv4
*/
for (dp = lp->strs[0]; *dp != '\0'; ++dp)
if (*dp == '.')
++dots;
}
if (i >= 0 || dots == 0)
{
/*
* No dots or not the rightmost value, then
* a hexedecimal value.
*/
if (lp->strs[i] != NULL)
{
ap->values[f] = strtoul(lp->strs[i], NULL, 16);
f = f + 1;
}
continue;
}
/*
* From here down deals with the special case of
* an ipv4 address at the righthand side.
*/
if (dots > 3)
{
return errno = EINVAL;
}
if (dots)
{
cp = strrchr(lp->strs[0], '.');
value2 = strtoul(cp+1, NULL, 10);
for (cp = cp-1; cp > lp->strs[0]; --cp)
if (*cp == '.')
break;
if (*cp == '.')
value = strtoul(cp+1, NULL, 10);
else
value = strtoul(cp, NULL, 10);
value <<= 8;
value &= 0xFFFF;
value += value2;
ap->values[0] = value;
ap->values[1] = 0;
}
if (dots > 1)
{
for (cp = cp-1; cp > lp->strs[0]; --cp)
if (*cp == '.')
break;
if (*cp == '.')
value = strtoul(cp+1, NULL, 10);
else
value = strtoul(cp+1, NULL, 10);
ap->values[1] = value;
}
if (dots > 2)
{
cp = lp->strs[0];
value = strtoul(cp, NULL, 10);
value <<= 8;
ap->values[1] += value;
}
f += 2;
continue;
}
ap->nvalues = f;
return 0;
}
static int
opendmarc_spf_ipv6_explode(char *str, TXT_ARY_T *ap)
{
char *cp, *ep;
int i;
int ncolons;
char copy[128];
if (str == NULL || ap == NULL)
return errno = EINVAL;
(void) memset(ap, '\0', sizeof(TXT_ARY_T));
(void) memset(copy, '\0', sizeof copy);
(void) strlcpy(copy, str, sizeof copy);
ncolons = 0;
for (cp = copy; *cp != '\0'; ++cp)
if (*cp == ':')
++ncolons;
ncolons = 7 - ncolons;
cp = copy;
for (i = 7; i >= 0; i--)
{
ep = strchr(cp, ':');
if (ep != NULL)
*ep = '\0';
if (strlen(cp) == 0)
{
(void) strlcpy((char *)ap->strs[i], "0", sizeof ap->strs[i]);
}
else
{
(void) strlcpy((char *)ap->strs[i], cp, sizeof ap->strs[i]);
}
if (ep && *(ep + 1) == ':' && ncolons > 0)
{
for (i--; i >= 0 && ncolons != 0; --ncolons, --i)
{
(void) strlcpy((char *)ap->strs[i], "0", sizeof ap->strs[i]);
}
i+= 1;
}
cp = ep+1;
}
ap->nstrs = 8 - i;
return 0;
}
int
opendmarc_spf_ipv6_cidr_check(char *ipv6_str, char *cidr_string)
{
int cidr_bits;
TXT_ARY_T ipv6_ary;
TXT_ARY_T cidr_ary;
INT_ARY_T base_iary;
INT_ARY_T low_iary;
INT_ARY_T hi_iary;
INT_ARY_T ip_iary;
char * cp;
int ret;
int i;
int taghi, taglo;
char cidr_str[256];
if (ipv6_str == NULL || cidr_string == NULL)
{
return FALSE;
}
if (strchr(ipv6_str, ':') == NULL)
return FALSE;
if (strchr(cidr_string, ':') == NULL)
return FALSE;
(void) strlcpy(cidr_str, cidr_string, sizeof cidr_str);
cp = strchr(cidr_str, '/');
if (cp == NULL)
{
cidr_bits = 0;
}
else
{
cidr_bits = strtoul(cp+1, NULL, 10);
*cp = '\0';
cp = strchr(cidr_str, ':');
if (cp == NULL)
cidr_bits = 32 - cidr_bits;
else
cidr_bits = 128 - cidr_bits;
}
ret = opendmarc_spf_ipv6_explode(ipv6_str, &ipv6_ary);
if (ret != 0)
{
return FALSE;
}
ret = opendmarc_spf_ipv6_explode(cidr_str, &cidr_ary);
if (ret != 0)
{
return FALSE;
}
ret = opendmarc_spf_ipv6_cidr_populate(&cidr_ary, &base_iary);
if (ret != 0)
{
return FALSE;
}
ret = opendmarc_spf_ipv6_cidr_populate(&ipv6_ary, &ip_iary);
if (ret != 0)
{
return FALSE;
}
if (cidr_bits == 0)
{
/*
* Requre an exact match.
*/
for (i = 0; i < base_iary.nvalues; i++)
{
if (base_iary.values[i] != ip_iary.values[i])
{
return FALSE;
}
}
return TRUE;
}
(void) memcpy(&low_iary, &base_iary, sizeof(INT_ARY_T));
(void) memcpy(&hi_iary, &base_iary, sizeof(INT_ARY_T));
for (i = 0; i < 8; i++)
{
int twobyte_mask, tmp_mask;
if (cidr_bits >= 16)
{
low_iary.values[i] = 0;
hi_iary.values[i] = 0xFFFF;
cidr_bits = cidr_bits - 16;
continue;
}
twobyte_mask = cidr_bits % 16;
tmp_mask = (0xFFFF << twobyte_mask);
low_iary.values[i] = low_iary.values[i] & tmp_mask;
tmp_mask = ((~tmp_mask) & 0xFFFF);
hi_iary.values[i] = hi_iary.values[i] | tmp_mask;
if (cidr_bits < 16)
break;
cidr_bits = cidr_bits - 16;
}
taghi = FALSE;
taglo = FALSE;
for (i = 7; i >= 0; --i)
{
if (ip_iary.values[i] == low_iary.values[i] && ip_iary.values[i] == hi_iary.values[i])
{
continue;
}
if (ip_iary.values[i] == hi_iary.values[i])
{
taghi = TRUE;
continue;
}
if (ip_iary.values[i] == low_iary.values[i])
{
taglo = TRUE;
continue;
}
if (taghi == TRUE)
{
if (ip_iary.values[i] > hi_iary.values[i])
{
return FALSE;
}
continue;
}
if (taglo == TRUE)
{
if (ip_iary.values[i] < low_iary.values[i])
{
return FALSE;
}
continue;
}
if (ip_iary.values[i] < low_iary.values[i] || ip_iary.values[i] > hi_iary.values[i])
{
return FALSE;
}
}
return TRUE;
}
/******************************************************************
** SPF_STRIP_DOTS -- Remove trailing and leading dots from
** a domain name.
******************************************************************/
static char *
opendmarc_spf_strip_dots(char *str, char *dot, char *buf, size_t buflen)
{
char *cp;
char dupe[BUFSIZ];
if (buflen > BUFSIZ)
buflen = BUFSIZ;
if (str == NULL || buf == NULL || buflen == 0)
return NULL;
(void) memset(buf, '\0', buflen);
(void) memset(dupe, '\0', buflen);
(void) strlcpy(dupe, str, buflen);
for (cp = dupe + strlen(dupe) - 1; cp > dupe; --cp)
{
if (*cp == '.')
*cp = '\0';
else
break;
}
for (cp = dupe; *cp != '\0'; ++cp)
{
if (*cp != '.')
break;
}
(void) strlcpy(buf, cp, buflen);
return buf;
}
int
opendmarc_spf_subdomain(char *dom, char *sub)
{
char dcopy[MAXDNSHOSTNAME];
char scopy[MAXDNSHOSTNAME];
char scratch[MAXDNSHOSTNAME];
char *cp;
int dlen;
int slen;
if (dom == NULL || sub == NULL)
return FALSE;
(void) memset(dcopy, '\0', sizeof dcopy);
(void) memset(scopy, '\0', sizeof scopy);
(void) memset(scratch, '\0', sizeof scratch);
cp = opendmarc_spf_strip_dots(dom, ".", scratch, sizeof scratch);
if (cp == NULL)
return FALSE;
cp = opendmarc_spf_reverse(scratch, dcopy, sizeof dcopy);
if (cp == NULL)
return FALSE;
cp = opendmarc_spf_strip_dots(sub, ".", scratch, sizeof scratch);
if (cp == NULL)
return FALSE;
cp = opendmarc_spf_reverse(scratch, scopy, sizeof scopy);
if (cp == NULL)
return FALSE;
(void) strlcat(dcopy, ".", sizeof dcopy);
(void) strlcat(scopy, ".", sizeof scopy);
dlen = strlen(dcopy);
slen = strlen(scopy);
if (dlen == slen)
{
if (strcasecmp(dcopy, scopy) == 0)
return TRUE;
return FALSE;
}
if (strncasecmp(dcopy, scopy, dlen) == 0)
return TRUE;
return FALSE;
}
static int
opendmarc_spf_ptr_domain(SPF_CTX_T *spfctx, char *domain)
{
char ** dry = NULL;
int dry_len = 0;
char ** dpp;
char ** ary = NULL;
int ary_len = 0;
char ** app;
char ** nary = NULL;
int nary_len = 0;
char ** npp;
int good = FALSE;;
if (spfctx->validated_domain[0] != '\0')
return TRUE;
dry = opendmarc_spf_dns_lookup_ptr(spfctx->ip_address, dry, &dry_len);
/*
* There can be muiltple host names returned.
*/
for (dpp = dry; dpp != NULL && *dpp != NULL; ++dpp)
{
ary = opendmarc_spf_dns_lookup_a(*dpp, ary, &ary_len);
if (ary == NULL)
continue;