forked from eaigner/libspf2
/
spf2.go
163 lines (141 loc) · 3.46 KB
/
spf2.go
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package libspf2
/*
#cgo LDFLAGS: -L/usr/local/lib -L/usr/lib -lspf2
#cgo CFLAGS: -g -O2 -Wno-error -I/usr/include -I/usr/local/include
#include <time.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <netdb.h>
#include <spf2/spf.h>
*/
import "C"
import (
"errors"
"net"
"unsafe"
)
const (
SPFResultINVALID = Result(C.SPF_RESULT_INVALID) // (invalid)
SPFResultPASS = Result(C.SPF_RESULT_PASS) // pass
SPFResultFAIL = Result(C.SPF_RESULT_FAIL) // fail
SPFResultSOFTFAIL = Result(C.SPF_RESULT_SOFTFAIL) // softfail
SPFResultNEUTRAL = Result(C.SPF_RESULT_NEUTRAL) // neutral
SPFResultPERMERROR = Result(C.SPF_RESULT_PERMERROR) // permerror
SPFResultTEMPERROR = Result(C.SPF_RESULT_TEMPERROR) // temperror
SPFResultNONE = Result(C.SPF_RESULT_NONE) // none
)
type Client interface {
Query(host string, ip net.IP) (Result, error)
Close()
}
type clientImpl struct {
s *C.SPF_server_t
}
// NewClient creates a new SPF client.
func NewClient() Client {
client := new(clientImpl)
client.s = C.SPF_server_new(C.SPF_DNS_RESOLV, 0)
return client
}
func (s *clientImpl) Query(host string, ip net.IP) (Result, error) {
if s.s == nil {
return SPFResultINVALID, errors.New("client already closed")
}
req := newRequest(s)
defer req.free()
if err := req.setEnvFrom(host); err != nil {
return SPFResultINVALID, err
}
if err := req.setIpAddr(ip); err != nil {
return SPFResultINVALID, err
}
resp, err := req.query()
if err != nil {
return SPFResultNONE, err
}
defer resp.free()
return resp.result(), nil
}
func (s *clientImpl) Close() {
if s.s != nil {
C.SPF_server_free(s.s)
s.s = nil
}
}
type request struct {
s *clientImpl
r *C.SPF_request_t
}
func newRequest(s *clientImpl) *request {
r := new(request)
r.s = s
r.r = C.SPF_request_new(s.s)
return r
}
// SetIPAddr sets the IP address of the client (sending) MTA
func (r *request) setIpAddr(ip net.IP) error {
var stat C.SPF_errcode_t
cstring := C.CString(ip.String())
defer C.free(unsafe.Pointer(cstring))
if ip.To4() != nil {
stat = C.SPF_request_set_ipv4_str(r.r, cstring)
} else {
stat = C.SPF_request_set_ipv6_str(r.r, cstring)
}
if stat != C.SPF_E_SUCCESS {
return &spfError{stat}
}
return nil
}
// SetEnvFrom sets the envelope from email address from the SMTP MAIL FROM: command
func (r *request) setEnvFrom(from string) error {
var stat C.int
cstring := C.CString(from)
defer C.free(unsafe.Pointer(cstring))
stat = C.SPF_request_set_env_from(r.r, cstring)
if stat != C.int(C.SPF_E_SUCCESS) {
return &spfError{C.SPF_errcode_t(stat)}
}
return nil
}
// Query starts the SPF query
func (r *request) query() (*response, error) {
var stat C.SPF_errcode_t
var resp *C.SPF_response_t
stat = C.SPF_request_query_mailfrom(r.r, &resp)
if stat != C.SPF_E_SUCCESS {
return nil, &spfError{stat}
}
return &response{resp}, nil
}
// Free the request handle
func (r *request) free() {
if r.r != nil {
C.SPF_request_free(r.r)
r.r = nil
}
}
type response struct {
r *C.SPF_response_t
}
// Result returns the SPF validation result
func (r *response) result() Result {
return Result(C.SPF_response_result(r.r))
}
// Free frees the response handle
func (r *response) free() {
if r.r != nil {
C.SPF_response_free(r.r)
r.r = nil
}
}
type Result int
func (r Result) String() string {
return C.GoString(C.SPF_strresult(C.SPF_result_t(r)))
}
type spfError struct {
code C.SPF_errcode_t
}
func (e *spfError) Error() string {
return C.GoString(C.SPF_strerror(e.code))
}