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Evil not very fun CGO glue for Certificate works! Also added a self-test project for Go code. Not using "go test" because of CMake build and CGO linking requirements that make it a pain in the derriere.

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This commit is contained in:
Adam Ierymenko 2020-07-03 16:05:43 -07:00
parent 7b869684c6
commit 451e6be180
No known key found for this signature in database
GPG key ID: C8877CF2D7A5D7F3
5 changed files with 236 additions and 79 deletions
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9
CMakeLists.txt
View file

@ -261,6 +261,15 @@ if(NOT PACKAGE_STATIC)
endif()
endif(WIN32)
add_custom_target(
zt_service_tests ALL
BYPRODUCTS ${CMAKE_BINARY_DIR}/zt_service_tests
SOURCES ${go_src}
COMMAND ${CMAKE_COMMAND} -E env ${GOARCH} ${GOARM} CGO_ENABLED=1 CGO_CFLAGS=\"-O3\" CGO_LDFLAGS=\"$<TARGET_FILE:zt_core> $<TARGET_FILE:zt_controller> $<TARGET_FILE:zt_service_io_core> $<TARGET_FILE:zt_osdep> ${GO_EXTRA_LIBRARIES}\" ${GO} build -mod=vendor ${GOFLAGS} -o ${CMAKE_BINARY_DIR}/zt_service_tests ${CMAKE_SOURCE_DIR}/cmd/zt_service_tests/*.go
COMMENT "Compiling zt_service_tests (Go/cgo self-tests)..."
)
add_dependencies(zt_service_tests zt_osdep zt_core zt_controller zt_service_io_core)
add_custom_target(
zerotier ALL
BYPRODUCTS ${CMAKE_BINARY_DIR}/zerotier

111
cmd/zt_service_tests/certificate.go Normal file
View file

@ -0,0 +1,111 @@
/*
* Copyright (C)2013-2020 ZeroTier, Inc.
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file in the project's root directory.
*
* Change Date: 2024-01-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2.0 of the Apache License.
*/
/****/
package main
import (
"bytes"
"encoding/json"
"fmt"
"zerotier/pkg/zerotier"
)
func TestCertificate() bool {
fmt.Println("Checking Certificate conversion to/from C ZT_Certificate structure...")
id, err := zerotier.NewIdentityFromString("8e4df28b72:0:ac3d46abe0c21f3cfe7a6c8d6a85cfcffcb82fbd55af6a4d6350657c68200843fa2e16f9418bbd9702cae365f2af5fb4c420908b803a681d4daef6114d78a2d7:bd8dd6e4ce7022d2f812797a80c6ee8ad180dc4ebf301dec8b06d1be08832bddd63a2f1cfa7b2c504474c75bdc8898ba476ef92e8e2d0509f8441985171ff16e")
if err != nil {
fmt.Printf(" Error deserializing test identity: %s\n", err.Error())
return false
}
var c zerotier.Certificate
c.SerialNo = make([]byte, 48)
for i := 0; i < 48 ;i++ {
c.SerialNo[i] = byte(i)
}
c.Flags = 1234
c.Timestamp = 5678
c.Validity[0] = 1010
c.Validity[1] = 2020
c.Subject.Timestamp = 31337
c.Subject.Identities = append(c.Subject.Identities, zerotier.CertificateIdentity{
Identity: id,
Locator: nil,
})
c.Subject.Networks = append(c.Subject.Networks, zerotier.CertificateNetwork{
ID: 1111,
Controller: zerotier.Fingerprint{
Address: zerotier.Address(2222),
Hash: c.SerialNo,
},
})
c.Subject.Certificates = append(c.Subject.Certificates, c.SerialNo)
c.Subject.UpdateURLs = append(c.Subject.UpdateURLs, "https://www.zerotier.com/asdfasdf")
c.Subject.Name.SerialNo = "a"
c.Subject.Name.CommonName = "b"
c.Subject.Name.StreetAddress = "c"
c.Subject.Name.Locality = "d"
c.Subject.Name.Province = "e"
c.Subject.Name.PostalCode = "f"
c.Subject.Name.Country = "g"
c.Subject.Name.Organization = "h"
c.Subject.Name.Unit = "i"
c.Subject.Name.Email = "j"
c.Subject.Name.URL = "k"
c.Subject.Name.Host = "l"
c.Subject.UniqueID = []byte("asdf")
c.Subject.UniqueIDProofSignature = []byte("ghij")
c.Issuer = id
c.IssuerName.SerialNo = "m"
c.IssuerName.CommonName = "n"
c.IssuerName.StreetAddress = "o"
c.IssuerName.Locality = "p"
c.IssuerName.Province = "q"
c.IssuerName.PostalCode = "r"
c.IssuerName.Country = "s"
c.IssuerName.Organization = "t"
c.IssuerName.Unit = "u"
c.IssuerName.Email = "v"
c.IssuerName.URL = "w"
c.IssuerName.Host = "x"
c.ExtendedAttributes = c.SerialNo
c.MaxPathLength = 9999
c.Signature = []byte("qwerty")
cc := c.CCertificate()
if cc == nil {
fmt.Println(" Error converting Certificate to ZT_Certificate")
return false
}
c2 := zerotier.NewCertificateFromCCertificate(cc.C)
if c2 == nil {
fmt.Println(" Error converting ZT_Certificate to Certificate")
return false
}
j, _ := json.MarshalIndent(c, "", " ")
j2, _ := json.MarshalIndent(c2, "", " ")
if !bytes.Equal(j, j2) {
j, _ = json.MarshalIndent(c, "", " ")
fmt.Print(" Deep equality test failed: certificates do not match! (see dumps below)\n\n")
fmt.Println(string(j))
fmt.Println(string(j2))
return false
}
return true
}

10
cmd/zt_service_tests/zt_service_tests.go Normal file
View file

@ -0,0 +1,10 @@
package main
import "os"
func main() {
if !TestCertificate() {
os.Exit(1)
}
}

176
pkg/zerotier/certificate.go
View file

@ -49,20 +49,20 @@ type CertificateIdentity struct {
// CertificateNetwork bundles a network ID with the fingerprint of its primary controller.
type CertificateNetwork struct {
ID uint64 `json:"id"`
Controller Fingerprint `json:"controller"`
ID uint64 `json:"id"`
Controller Fingerprint `json:"controller"`
}
// CertificateSubject contains information about the subject of a certificate.
type CertificateSubject struct {
Timestamp int64 `json:"timestamp"`
Identities []CertificateIdentity `json:"identities,omitempty"`
Networks []CertificateNetwork `json:"networks,omitempty"`
Certificates [][CertificateSerialNoSize]byte `json:"certificates,omitempty"`
UpdateURLs []string `json:"updateURLs,omitempty"`
Name CertificateName `json:"name"`
UniqueID []byte `json:"uniqueId,omitempty"`
UniqueIDProofSignature []byte `json:"uniqueIdProofSignature,omitempty"`
Timestamp int64 `json:"timestamp"`
Identities []CertificateIdentity `json:"identities,omitempty"`
Networks []CertificateNetwork `json:"networks,omitempty"`
Certificates [][]byte `json:"certificates,omitempty"`
UpdateURLs []string `json:"updateURLs,omitempty"`
Name CertificateName `json:"name"`
UniqueID []byte `json:"uniqueId,omitempty"`
UniqueIDProofSignature []byte `json:"uniqueIdProofSignature,omitempty"`
}
// Certificate is a Go reflection of the C ZT_Certificate struct.
@ -79,25 +79,30 @@ type Certificate struct {
Signature []byte `json:"signature,omitempty"`
}
type cCertificate struct {
C C.ZT_Certificate
type CCertificate struct {
C unsafe.Pointer
internalCertificate C.ZT_Certificate
internalSubjectIdentities []C.ZT_Certificate_Identity
internalSubjectNetworks []C.ZT_Certificate_Network
internalSubjectUpdateURLs []*C.char
internalSubjectCertificates []uintptr
internalSubjectUpdateURLs []uintptr
internalSubjectUpdateURLsData [][]byte
}
// newCertificateFromCCertificate translates a C ZT_Certificate into a Go Certificate.
func newCertificateFromCCertificate(cc *C.ZT_Certificate) *Certificate {
// NewCertificateFromCCertificate translates a C ZT_Certificate into a Go Certificate.
func NewCertificateFromCCertificate(ccptr unsafe.Pointer) *Certificate {
cc := (*C.ZT_Certificate)(ccptr)
c := new(Certificate)
if cc == nil {
return c
}
c.SerialNo = C.GoBytes(unsafe.Pointer(&cc.serialNo[0]), 48)
if allZero(c.SerialNo) {
c.SerialNo = nil
sn := (*[48]byte)(unsafe.Pointer(&cc.serialNo[0]))[:]
if !allZero(sn) {
var tmp [48]byte
copy(tmp[:], sn)
c.SerialNo = tmp[:]
}
c.Flags = uint64(cc.flags)
c.Timestamp = int64(cc.timestamp)
@ -135,14 +140,16 @@ func newCertificateFromCCertificate(cc *C.ZT_Certificate) *Certificate {
return nil
}
c.Subject.Networks = append(c.Subject.Networks, CertificateNetwork{
ID: uint64(cn.id),
ID: uint64(cn.id),
Controller: *fp,
})
}
for i := 0; i < int(cc.subject.certificateCount); i++ {
csn := (*[48]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(cc.subject.certificates)) + (uintptr(i) * pointerSize)))
c.Subject.Certificates = append(c.Subject.Certificates, *csn)
csn := *((**[48]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(cc.subject.certificates)) + (uintptr(i) * pointerSize))))
var tmp [48]byte
copy(tmp[:], csn[:])
c.Subject.Certificates = append(c.Subject.Certificates, tmp[:])
}
for i := 0; i < int(cc.subject.updateURLCount); i++ {
@ -204,26 +211,36 @@ func newCertificateFromCCertificate(cc *C.ZT_Certificate) *Certificate {
return c
}
// cCertificate creates a C ZT_Certificate structure from the content of a Certificate.
// CCertificate creates a C ZT_Certificate structure from the content of a Certificate.
//
// This will return nil if an error occurs, which would indicate an invalid C
// structure or one with invalid values.
//
// The returned Go structure bundles this with some objects that have
// to be created to set their pointers in ZT_Certificate. It's easier to
// manage allocation of these in Go and bundle them so Go's GC will clean
// them up automatically when cCertificate is released. Only the 'C' field
// in cCertificate should be directly used.
func (c *Certificate) cCertificate() *cCertificate {
var cc cCertificate
// them up automatically when CCertificate is released. Only the 'C' field
// in CCertificate should be directly used. The rest are internal and are
// hidden outside the package.
//
// Ensure that Certificate is not modified until the generated C certificate
// is no longer in use.
func (c *Certificate) CCertificate() *CCertificate {
var cc CCertificate
var ccC *C.ZT_Certificate
cc.C = unsafe.Pointer(&cc.internalCertificate)
ccC = &cc.internalCertificate
if len(c.SerialNo) == 48 {
copy((*[48]byte)(unsafe.Pointer(&cc.C.serialNo[0]))[:], c.SerialNo[:])
copy((*[48]byte)(unsafe.Pointer(&ccC.serialNo[0]))[:], c.SerialNo)
}
cc.C.flags = C.uint64_t(c.Flags)
cc.C.timestamp = C.int64_t(c.Timestamp)
cc.C.validity[0] = C.int64_t(c.Validity[0])
cc.C.validity[1] = C.int64_t(c.Validity[1])
ccC.flags = C.uint64_t(c.Flags)
ccC.timestamp = C.int64_t(c.Timestamp)
ccC.validity[0] = C.int64_t(c.Validity[0])
ccC.validity[1] = C.int64_t(c.Validity[1])
cc.C.subject.timestamp = C.int64_t(c.Subject.Timestamp)
ccC.subject.timestamp = C.int64_t(c.Subject.Timestamp)
if len(c.Subject.Identities) > 0 {
cc.internalSubjectIdentities = make([]C.ZT_Certificate_Identity, len(c.Subject.Identities))
@ -236,8 +253,8 @@ func (c *Certificate) cCertificate() *cCertificate {
cc.internalSubjectIdentities[i].locator = id.Locator.cl
}
}
cc.C.subject.identities = &cc.internalSubjectIdentities[0]
cc.C.subject.identityCount = C.uint(len(c.Subject.Identities))
ccC.subject.identities = &cc.internalSubjectIdentities[0]
ccC.subject.identityCount = C.uint(len(c.Subject.Identities))
}
if len(c.Subject.Networks) > 0 {
@ -249,45 +266,52 @@ func (c *Certificate) cCertificate() *cCertificate {
copy((*[48]byte)(unsafe.Pointer(&cc.internalSubjectNetworks[i].controller.hash[0]))[:], n.Controller.Hash)
}
}
cc.C.subject.networks = &cc.internalSubjectNetworks[0]
cc.C.subject.networkCount = C.uint(len(c.Subject.Networks))
ccC.subject.networks = &cc.internalSubjectNetworks[0]
ccC.subject.networkCount = C.uint(len(c.Subject.Networks))
}
if len(c.Subject.Certificates) > 0 {
cc.C.subject.certificates = (**C.uint8_t)(unsafe.Pointer(&c.Subject.Certificates[0]))
cc.C.subject.certificateCount = C.uint(len(c.Subject.Certificates))
cc.internalSubjectCertificates = make([]uintptr, len(c.Subject.Certificates))
for i, cert := range c.Subject.Certificates {
if len(cert) != 48 {
return nil
}
cc.internalSubjectCertificates[i] = uintptr(unsafe.Pointer(&cert[0]))
}
ccC.subject.certificates = (**C.uint8_t)(unsafe.Pointer(&cc.internalSubjectCertificates[0]))
ccC.subject.certificateCount = C.uint(len(c.Subject.Certificates))
}
if len(c.Subject.UpdateURLs) > 0 {
cc.internalSubjectUpdateURLs = make([]*C.char, len(c.Subject.UpdateURLs))
cc.internalSubjectUpdateURLs = make([]uintptr, len(c.Subject.UpdateURLs))
cc.internalSubjectUpdateURLsData = make([][]byte, len(c.Subject.UpdateURLs))
for i, u := range c.Subject.UpdateURLs {
cc.internalSubjectUpdateURLsData[i] = stringAsZeroTerminatedBytes(u)
cc.internalSubjectUpdateURLs[i] = (*C.char)(unsafe.Pointer(&cc.internalSubjectUpdateURLsData[0]))
cc.internalSubjectUpdateURLs[i] = uintptr(unsafe.Pointer(&cc.internalSubjectUpdateURLsData[0][0]))
}
cc.C.subject.updateURLs = (**C.char)(unsafe.Pointer(&cc.internalSubjectUpdateURLs[0]))
cc.C.subject.updateURLCount = C.uint(len(c.Subject.UpdateURLs))
ccC.subject.updateURLs = (**C.char)(unsafe.Pointer(&cc.internalSubjectUpdateURLs[0]))
ccC.subject.updateURLCount = C.uint(len(c.Subject.UpdateURLs))
}
cStrCopy(unsafe.Pointer(&cc.C.subject.name.serialNo[0]), CertificateMaxStringLength+1, c.Subject.Name.SerialNo)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.commonName[0]), CertificateMaxStringLength+1, c.Subject.Name.CommonName)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.country[0]), CertificateMaxStringLength+1, c.Subject.Name.Country)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.organization[0]), CertificateMaxStringLength+1, c.Subject.Name.Organization)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.unit[0]), CertificateMaxStringLength+1, c.Subject.Name.Unit)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.locality[0]), CertificateMaxStringLength+1, c.Subject.Name.Locality)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.province[0]), CertificateMaxStringLength+1, c.Subject.Name.Province)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.streetAddress[0]), CertificateMaxStringLength+1, c.Subject.Name.StreetAddress)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.postalCode[0]), CertificateMaxStringLength+1, c.Subject.Name.PostalCode)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.email[0]), CertificateMaxStringLength+1, c.Subject.Name.Email)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.url[0]), CertificateMaxStringLength+1, c.Subject.Name.URL)
cStrCopy(unsafe.Pointer(&cc.C.subject.name.host[0]), CertificateMaxStringLength+1, c.Subject.Name.Host)
cStrCopy(unsafe.Pointer(&ccC.subject.name.serialNo[0]), CertificateMaxStringLength+1, c.Subject.Name.SerialNo)
cStrCopy(unsafe.Pointer(&ccC.subject.name.commonName[0]), CertificateMaxStringLength+1, c.Subject.Name.CommonName)
cStrCopy(unsafe.Pointer(&ccC.subject.name.country[0]), CertificateMaxStringLength+1, c.Subject.Name.Country)
cStrCopy(unsafe.Pointer(&ccC.subject.name.organization[0]), CertificateMaxStringLength+1, c.Subject.Name.Organization)
cStrCopy(unsafe.Pointer(&ccC.subject.name.unit[0]), CertificateMaxStringLength+1, c.Subject.Name.Unit)
cStrCopy(unsafe.Pointer(&ccC.subject.name.locality[0]), CertificateMaxStringLength+1, c.Subject.Name.Locality)
cStrCopy(unsafe.Pointer(&ccC.subject.name.province[0]), CertificateMaxStringLength+1, c.Subject.Name.Province)
cStrCopy(unsafe.Pointer(&ccC.subject.name.streetAddress[0]), CertificateMaxStringLength+1, c.Subject.Name.StreetAddress)
cStrCopy(unsafe.Pointer(&ccC.subject.name.postalCode[0]), CertificateMaxStringLength+1, c.Subject.Name.PostalCode)
cStrCopy(unsafe.Pointer(&ccC.subject.name.email[0]), CertificateMaxStringLength+1, c.Subject.Name.Email)
cStrCopy(unsafe.Pointer(&ccC.subject.name.url[0]), CertificateMaxStringLength+1, c.Subject.Name.URL)
cStrCopy(unsafe.Pointer(&ccC.subject.name.host[0]), CertificateMaxStringLength+1, c.Subject.Name.Host)
if len(c.Subject.UniqueID) > 0 {
cc.C.subject.uniqueId = (*C.uint8_t)(unsafe.Pointer(&c.Subject.UniqueID[0]))
cc.C.subject.uniqueIdSize = C.uint(len(c.Subject.UniqueID))
ccC.subject.uniqueId = (*C.uint8_t)(unsafe.Pointer(&c.Subject.UniqueID[0]))
ccC.subject.uniqueIdSize = C.uint(len(c.Subject.UniqueID))
if len(c.Subject.UniqueIDProofSignature) > 0 {
cc.C.subject.uniqueIdProofSignature = (*C.uint8_t)(unsafe.Pointer(&c.Subject.UniqueIDProofSignature[0]))
cc.C.subject.uniqueIdProofSignatureSize = C.uint(len(c.Subject.UniqueIDProofSignature))
ccC.subject.uniqueIdProofSignature = (*C.uint8_t)(unsafe.Pointer(&c.Subject.UniqueIDProofSignature[0]))
ccC.subject.uniqueIdProofSignatureSize = C.uint(len(c.Subject.UniqueIDProofSignature))
}
}
@ -295,32 +319,32 @@ func (c *Certificate) cCertificate() *cCertificate {
if !c.Issuer.initCIdentityPtr() {
return nil
}
cc.C.issuer = c.Issuer.cid
ccC.issuer = c.Issuer.cid
}
cStrCopy(unsafe.Pointer(&cc.C.issuerName.serialNo[0]), CertificateMaxStringLength+1, c.IssuerName.SerialNo)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.commonName[0]), CertificateMaxStringLength+1, c.IssuerName.CommonName)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.country[0]), CertificateMaxStringLength+1, c.IssuerName.Country)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.organization[0]), CertificateMaxStringLength+1, c.IssuerName.Organization)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.unit[0]), CertificateMaxStringLength+1, c.IssuerName.Unit)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.locality[0]), CertificateMaxStringLength+1, c.IssuerName.Locality)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.province[0]), CertificateMaxStringLength+1, c.IssuerName.Province)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.streetAddress[0]), CertificateMaxStringLength+1, c.IssuerName.StreetAddress)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.postalCode[0]), CertificateMaxStringLength+1, c.IssuerName.PostalCode)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.email[0]), CertificateMaxStringLength+1, c.IssuerName.Email)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.url[0]), CertificateMaxStringLength+1, c.IssuerName.URL)
cStrCopy(unsafe.Pointer(&cc.C.issuerName.host[0]), CertificateMaxStringLength+1, c.IssuerName.Host)
cStrCopy(unsafe.Pointer(&ccC.issuerName.serialNo[0]), CertificateMaxStringLength+1, c.IssuerName.SerialNo)
cStrCopy(unsafe.Pointer(&ccC.issuerName.commonName[0]), CertificateMaxStringLength+1, c.IssuerName.CommonName)
cStrCopy(unsafe.Pointer(&ccC.issuerName.country[0]), CertificateMaxStringLength+1, c.IssuerName.Country)
cStrCopy(unsafe.Pointer(&ccC.issuerName.organization[0]), CertificateMaxStringLength+1, c.IssuerName.Organization)
cStrCopy(unsafe.Pointer(&ccC.issuerName.unit[0]), CertificateMaxStringLength+1, c.IssuerName.Unit)
cStrCopy(unsafe.Pointer(&ccC.issuerName.locality[0]), CertificateMaxStringLength+1, c.IssuerName.Locality)
cStrCopy(unsafe.Pointer(&ccC.issuerName.province[0]), CertificateMaxStringLength+1, c.IssuerName.Province)
cStrCopy(unsafe.Pointer(&ccC.issuerName.streetAddress[0]), CertificateMaxStringLength+1, c.IssuerName.StreetAddress)
cStrCopy(unsafe.Pointer(&ccC.issuerName.postalCode[0]), CertificateMaxStringLength+1, c.IssuerName.PostalCode)
cStrCopy(unsafe.Pointer(&ccC.issuerName.email[0]), CertificateMaxStringLength+1, c.IssuerName.Email)
cStrCopy(unsafe.Pointer(&ccC.issuerName.url[0]), CertificateMaxStringLength+1, c.IssuerName.URL)
cStrCopy(unsafe.Pointer(&ccC.issuerName.host[0]), CertificateMaxStringLength+1, c.IssuerName.Host)
if len(c.ExtendedAttributes) > 0 {
cc.C.extendedAttributes = (*C.uint8_t)(unsafe.Pointer(&c.ExtendedAttributes[0]))
cc.C.extendedAttributesSize = C.uint(len(c.ExtendedAttributes))
ccC.extendedAttributes = (*C.uint8_t)(unsafe.Pointer(&c.ExtendedAttributes[0]))
ccC.extendedAttributesSize = C.uint(len(c.ExtendedAttributes))
}
cc.C.maxPathLength = C.uint(c.MaxPathLength)
ccC.maxPathLength = C.uint(c.MaxPathLength)
if len(c.Signature) > 0 {
cc.C.signature = (*C.uint8_t)(unsafe.Pointer(&c.Signature[0]))
cc.C.signatureSize = C.uint(len(c.Signature))
ccC.signature = (*C.uint8_t)(unsafe.Pointer(&c.Signature[0]))
ccC.signatureSize = C.uint(len(c.Signature))
}
return &cc

9
pkg/zerotier/misc.go
View file

@ -279,10 +279,13 @@ func stringAsZeroTerminatedBytes(s string) (b []byte) {
// cStrCopy copies src into dest as a zero-terminated C string
func cStrCopy(dest unsafe.Pointer, destSize int, src string) {
sb := []byte(src)
b := C.GoBytes(dest, C.int(destSize))
if len(sb) > (destSize - 1) {
sb = sb[0:destSize - 1]
}
copy(b[:], sb[:])
b[len(sb)] = 0
dp := dest
for _, c := range sb {
*((*byte)(dp)) = c
dp = unsafe.Pointer(uintptr(dp) + 1)
}
*((*byte)(dp)) = 0
}