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v2gconn.c
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#include "nikolav2g.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <polarssl/ssl_cache.h>
#include <polarssl/error.h>
#include <OpenV2G/appHandEXIDatatypes.h>
#include <OpenV2G/appHandEXIDatatypesEncoder.h>
#include <OpenV2G/appHandEXIDatatypesDecoder.h>
#include <OpenV2G/v2gEXIDatatypesEncoder.h>
#include <OpenV2G/v2gEXIDatatypesDecoder.h>
#include <OpenV2G/v2gtp.h>
int chattyv2g = 0;
//===================================
// Defines
//===================================
#define V2G_EVCC_Msg_Timeout_SupportedAppProtocolReq 2
#define V2G_EVCC_Msg_Timeout_SessionSetupReq 2
#define V2G_EVCC_Msg_Timeout_ServiceDiscoveryReq 2
#define V2G_EVCC_Msg_Timeout_ServiceDetailReq 5
#define V2G_EVCC_Msg_Timeout_PaymentServiceSelectionReq 2
#define V2G_EVCC_Msg_Timeout_PaymentDetailsReq 5
#define V2G_EVCC_Msg_Timeout_AuthorizationReq 2
#define V2G_EVCC_Msg_Timeout_ChargeParameterDiscoveryReq 2
#define V2G_EVCC_Msg_Timeout_ChargingStatusReq 2
#define V2G_EVCC_Msg_Timeout_MeteringReceiptReq 2
#define V2G_EVCC_Msg_Timeout_PowerDeliveryReq 5
#define V2G_EVCC_Msg_Timeout_CableCheckReq 2
#define V2G_EVCC_Msg_Timeout_PreChargeReq 2
#define V2G_EVCC_Msg_Timeout_CurrentDemandReq 0.25
#define V2G_EVCC_Msg_Timeout_WeldingDetectionReq 2
#define V2G_EVCC_Msg_Timeout_SessionStopReq 2
#define V2G_EVCC_Msg_Timeout_CertificateInstallationReq 5
#define V2G_EVCC_Msg_Timeout_CertificateUpdateReq 5
#define V2G_EVCC_Msg_Timeout_Default 2
#define V2G_SECC_Sequence_Timeout 60
#define IGNORE_SSL_CERTIFICATE_VALIDITY 0 // Set to 1 for ca testing
#define TIME_MICROSECOND 1000
#define TIME_MILLISECOND (TIME_MICROSECOND * 1000)
#define TIME_SECOND (TIME_MILLISECOND * 1000)
#define BUFFER_SIZE 4096
#define MAX_CLIENT_REQUEST_QUEUE_LEN 100
#define ISO_15118_MSG_DEF "urn:iso:15118:2:2010:MsgDef"
//===================================
// Typdefs
//===================================
#ifndef byte
typedef uint8_t byte;
#endif
typedef unsigned long long uvlong;
// Defined in nicolav2g.h:
// typedef struct blocking_request blocking_request_t;
struct blocking_request {
Chan wake_chan;
byte *buffer; // Used both for request & response
size_t buffer_len; // size of the underlying buffer
blocking_request_t *next;
};
typedef struct ssln_arg ssln_arg_t;
struct ssln_arg {
ssl_context *ssl;
byte *buffer;
unsigned int n;
};
typedef struct tcpn_arg tcpn_arg_t;
struct tcpn_arg{
int sockfd;
byte *buffer;
unsigned int n;
};
//===================================
// Globals
//===================================
static const uint8_t SECC_LOCALHOST_ADDR[16] = { 0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 1 };
static const int V2G_CIPHER_SUITES[] = {
TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
0
};
uint16_t SECC_Port;
//======================================
// Error print
//======================================
void print_byte_array(byte *arr, size_t n)
{
int i;
if (chattyv2g) fprintf(stderr, "[");
// Highly ineffictive but whatever it's TESTING!! :D
for (i = 0; i < n; i++) {
if (chattyv2g) fprintf(stderr, " %02x", arr[i]);
}
if (chattyv2g) fprintf(stderr, " ]\n");
}
void print_mbedtls_err(int errcode) {
char buf[1024];
printf("RIIIIIIIIIIP\n");
polarssl_strerror(errcode, buf, 1024);
printf("polarssl error = %s\n", buf);
}
void print_ssl_read_err(int err)
{
switch (err) {
case POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY:
if (chattyv2g) fprintf(stderr, "connection was closed gracefully\n");
return;
case POLARSSL_ERR_NET_CONN_RESET:
if (chattyv2g) fprintf(stderr, "connection was reset by peer\n");
return;
case POLARSSL_ERR_NET_WANT_READ:
case POLARSSL_ERR_NET_WANT_WRITE:
if (chattyv2g) fprintf(stderr, "ssl socket error; want read/want write\n");
return;
case 0:
if (chattyv2g) fprintf(stderr, "EOF, connection closed\n");
return;
default:
if (chattyv2g) fprintf(stderr, "ssl_read returned -0x%04x\n", -err);
return;
}
}
void debug_sslhandshake(ssl_context *ssl) {
int err;
if ((err = ssl_get_verify_result(ssl)) != 0) {
fprintf(stderr, "evcc_connect_tls failed\n");
if ((err & BADCERT_EXPIRED) != 0) {
fprintf(stderr, " ! server certificate has expired\n");
}
if ((err & BADCERT_REVOKED) != 0) {
fprintf(stderr, " ! server certificate has been revoked\n");
}
if ((err & BADCERT_CN_MISMATCH) != 0) {
fprintf(stderr, " ! CN mismatch (expected CN=%s)\n", "PolarSSL Server 1");
}
if ((err & BADCERT_NOT_TRUSTED) != 0) {
fprintf(stderr, " ! self-signed or not signed by a trusted CA\n");
}
fprintf(stderr, "\n");
} else {
fprintf(stderr, " ok\n");
}
}
//======================================
// Non-SSL IO functions
//======================================
static ssize_t iocall_readn(void *vargs, atomic_int *cancel)
{
tcpn_arg_t *args = vargs;
int bytes_read = 0;
int tries = 0;
int ret;
while (bytes_read < args->n && atomic_load(cancel) == 0) {
ret = read(args->sockfd, args->buffer + bytes_read,
args->n - bytes_read);
if (ret == POLARSSL_ERR_NET_WANT_READ ||
ret == POLARSSL_ERR_NET_WANT_WRITE) {
if (tries > 30) {
if (chattyv2g) fprintf(stderr, "sslreadn: Too many socket read errors\n");
return -1;
}
continue;
}
if (ret < 1) {
if (ret != 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "iocall_readn: read err");
}
return -1;
}
bytes_read += ret;
}
return 0;
}
static ssize_t iocall_writen(void *vargs, atomic_int *cancel)
{
tcpn_arg_t *args = vargs;
int bytes_written = 0;
int ret;
while (bytes_written < args->n && atomic_load(cancel) == 0) {
ret = write(args->sockfd, args->buffer + bytes_written,
args->n - bytes_written);
if (ret < 1) {
if (ret != 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "iocall_writen: write err");
}
return -1;
}
bytes_written += ret;
}
return 0;
}
static int readn(int sockfd, byte *buffer,
unsigned int n, Chan *tc)
{
Alt alts[3];
tcpn_arg_t args = {
.sockfd = sockfd,
.buffer = buffer,
.n = n,
};
ssize_t ret;
int err;
Chan *ioc = iochan(1048576 - PTHREAD_STACK_MIN);
if (ioc == NULL) {
if (chattyv2g) fprintf(stderr, "sslreadn error: iochan error\n");
return -1;
}
iocall(ioc, &iocall_readn, &args, sizeof(args));
alts[0].c = ioc;
alts[0].v = &ret;
alts[0].op = CHANRECV;
alts[1].c = tc;
alts[1].v = NULL;
alts[1].op = CHANRECV;
alts[2].op = CHANEND;
switch (alt(alts)) {
case 0:
err = (int)ret;
break;
case 1:
iocancel(ioc);
if (chattyv2g) fprintf(stderr, "sslreadn error: timeout\n");
err = -1;
break;
default:
if (chattyv2g) fprintf(stderr, "critical sslreadn: alt error\n");
abort();
}
chanfree(ioc);
return err;
}
static int writen(int sockfd, byte *buffer,
unsigned int n, Chan *tc)
{
Alt alts[3];
tcpn_arg_t args = {
.sockfd = sockfd,
.buffer = buffer,
.n = n,
};
ssize_t ret;
int err;
Chan *ioc = iochan(1048576 - PTHREAD_STACK_MIN);
if (ioc == NULL) {
if (chattyv2g) fprintf(stderr, "sslwriten error: iochan error\n");
return -1;
}
iocall(ioc, &iocall_writen, &args, sizeof(args));
alts[0].c = ioc;
alts[0].v = &ret;
alts[0].op = CHANRECV;
alts[1].c = tc;
alts[1].v = NULL;
alts[1].op = CHANRECV;
alts[2].op = CHANEND;
switch (alt(alts)) {
case 0:
err = (int) ret;
break;
case 1:
iocancel(ioc);
if (chattyv2g) fprintf(stderr, "sslwriten error: timeout\n");
err = -1;
break;
default:
if (chattyv2g) fprintf(stderr, "critical sslwriten: alt error\n");
abort();
}
chanfree(ioc);
return err;
}
//======================================
// SSL IO functions
//======================================
static ssize_t iocall_sslreadn(void *vargs, atomic_int *cancel)
{
ssln_arg_t *args = vargs;
int bytes_read = 0;
int tries = 0;
int ret;
while (bytes_read < args->n && atomic_load(cancel) == 0) {
ret = ssl_read(args->ssl, args->buffer + bytes_read,
args->n - bytes_read);
if (ret == POLARSSL_ERR_NET_WANT_READ ||
ret == POLARSSL_ERR_NET_WANT_WRITE) {
if (tries > 30) {
if (chattyv2g) fprintf(stderr, "sslreadn: Too many socket read errors\n");
return -1;
}
continue;
}
if (ret < 1) {
print_ssl_read_err(ret);
return -1;
}
bytes_read += ret;
}
return 0;
}
static ssize_t iocall_sslwriten(void *vargs, atomic_int *cancel)
{
ssln_arg_t *args = vargs;
int bytes_written = 0;
int ret;
while (bytes_written < args->n && atomic_load(cancel) == 0) {
ret = ssl_write(args->ssl, args->buffer + bytes_written,
args->n - bytes_written);
if (ret < 1) {
print_ssl_read_err(ret);
return -1;
}
bytes_written += ret;
}
return 0;
}
static int sslreadn(ssl_context *ssl, byte *buffer,
unsigned int n, Chan *tc)
{
Alt alts[3];
ssln_arg_t args = {
.ssl = ssl,
.buffer = buffer,
.n = n,
};
ssize_t ret;
int err;
Chan *ioc = iochan(1048576 - PTHREAD_STACK_MIN);
if (ioc == NULL) {
if (chattyv2g) fprintf(stderr, "sslreadn error: iochan error\n");
return -1;
}
iocall(ioc, &iocall_sslreadn, &args, sizeof(args));
alts[0].c = ioc;
alts[0].v = &ret;
alts[0].op = CHANRECV;
alts[1].c = tc;
alts[1].v = NULL;
alts[1].op = CHANRECV;
alts[2].op = CHANEND;
switch (alt(alts)) {
case 0:
err = (int)ret;
break;
case 1:
iocancel(ioc);
if (chattyv2g) fprintf(stderr, "sslreadn error: timeout\n");
err = -1;
break;
default:
if (chattyv2g) fprintf(stderr, "critical sslreadn: alt error\n");
abort();
}
chanfree(ioc);
return err;
}
static int sslwriten(ssl_context *ssl, byte *buffer,
unsigned int n, Chan *tc)
{
Alt alts[3];
ssln_arg_t args = {
.ssl = ssl,
.buffer = buffer,
.n = n,
};
ssize_t ret;
int err;
Chan *ioc = iochan(1048576 - PTHREAD_STACK_MIN);
if (ioc == NULL) {
if (chattyv2g) fprintf(stderr, "sslwriten error: iochan error\n");
return -1;
}
iocall(ioc, &iocall_sslwriten, &args, sizeof(args));
alts[0].c = ioc;
alts[0].v = &ret;
alts[0].op = CHANRECV;
alts[1].c = tc;
alts[1].v = NULL;
alts[1].op = CHANRECV;
alts[2].op = CHANEND;
switch (alt(alts)) {
case 0:
err = (int) ret;
break;
case 1:
iocancel(ioc);
if (chattyv2g) fprintf(stderr, "sslwriten error: timeout\n");
err = -1;
break;
default:
if (chattyv2g) fprintf(stderr, "critical sslwriten: alt error\n");
abort();
}
chanfree(ioc);
return err;
}
// combiness both encrypted and unencrypted communication
int comboreadn(comboconn_t *cconn, byte *buffer,
unsigned int n, Chan *t) {
if (cconn->tls_enabled) {
return sslreadn(&cconn->ssl, buffer, n, t);
}
return readn(cconn->sockfd, buffer, n, t);
}
int combowriten(comboconn_t *cconn, byte *buffer,
unsigned int n, Chan *t) {
if (cconn->tls_enabled) {
return sslwriten(&cconn->ssl, buffer, n, t);
}
return writen(cconn->sockfd, buffer, n, t);
}
uint16_t get_secc_port()
{
// No mutexes are used since it's assumed
// secc_listen_tls is only started once:
// i.e. in program init
return SECC_Port;
}
void my_debug(void *ctx, int level, const char *str)
{
((void)level);
((void)ctx);
if (chattyv2g) {
fprintf(stderr, "%s", str);
fflush(stderr);
}
}
//======================================
// EXI functions
//======================================
static int serializeEXI2Stream(struct v2gEXIDocument *exiIn, bitstream_t *stream)
{
int errn;
*stream->pos = V2GTP_HEADER_LENGTH; // v2gtp header
if ((errn = encode_v2gExiDocument(stream, exiIn)) == 0) {
errn = write_v2gtpHeader(stream->data, (*stream->pos)-V2GTP_HEADER_LENGTH, V2GTP_EXI_TYPE);
}
return errn;
}
// deserializes V2G TP header and decodes right away EXI stream
static int deserializeStream2EXI(bitstream_t *streamIn, struct v2gEXIDocument *exi)
{
int errn;
uint16_t payloadLength;
*streamIn->pos = 0;
if ((errn = read_v2gtpHeader(streamIn->data, &payloadLength)) == 0) {
*streamIn->pos += V2GTP_HEADER_LENGTH;
errn = decode_v2gExiDocument(streamIn, exi);
}
return errn;
}
static int writeStringToEXIString(const char *string,
exi_string_character_t *exiString)
{
int pos = 0;
while(string[pos]!='\0')
{
exiString[pos] = string[pos];
pos++;
}
return pos;
}
// existrings are not null-terminated
static int compare_exi_string_to_string(exi_string_character_t *existring,
const char *string, int n)
{
int pos = 0;
while (string[pos]!='\0' && pos < n) {
if ((exi_string_character_t)string[pos] != existring[pos]) {
break;
}
if (pos == n - 1) {
return 0;
}
pos++;
}
return -1;
}
uvlong get_req_timeout(struct v2gEXIDocument *exiIn)
{
if (exiIn->V2G_Message.Body.SessionSetupReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_SessionSetupReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.ServiceDiscoveryReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_ServiceDiscoveryReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.ServiceDetailReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_ServiceDetailReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.PaymentServiceSelectionReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_PaymentServiceSelectionReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.PaymentDetailsReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_PaymentDetailsReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.AuthorizationReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_AuthorizationReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.ChargeParameterDiscoveryReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_ChargeParameterDiscoveryReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.PowerDeliveryReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_PowerDeliveryReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.ChargingStatusReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_ChargingStatusReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.MeteringReceiptReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_MeteringReceiptReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.SessionStopReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_SessionStopReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.CableCheckReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_CableCheckReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.PreChargeReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_PreChargeReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.CurrentDemandReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_CurrentDemandReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.WeldingDetectionReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_WeldingDetectionReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.CertificateInstallationReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_CertificateInstallationReq * TIME_SECOND;
} else if (exiIn->V2G_Message.Body.CertificateUpdateReq_isUsed) {
return (uvlong)V2G_EVCC_Msg_Timeout_CertificateUpdateReq * TIME_SECOND;
} else {
if (chattyv2g) fprintf(stderr, "get_req_timeout: unknown request, using default timeout\n");
return (uvlong)V2G_EVCC_Msg_Timeout_Default * TIME_SECOND;
}
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//======================================
// Server (EVSE)
//======================================
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
struct tls_global_params_t{
x509_crt srvcert;
pk_context pkey;
entropy_context entropy;
ssl_cache_context cache;
handle_func_t handle_func;
x509_crt trusted_client_rootcerts;
};
struct handletls_args_t{
int fd;
struct tls_global_params_t *global;
};
// Bind the TLS listener to a dynamic port
int bind_v2gport(int *port)
{
int err;
struct sockaddr_in6 bound_laddr;
unsigned int bound_laddr_len = sizeof(bound_laddr);
struct sockaddr_in6 laddr = {
.sin6_family = AF_INET6,
.sin6_port = htons(0), // dynamic port
};
int sock = socket(AF_INET6, SOCK_STREAM, 0);
if (sock < 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "socket");
return -1;
}
memcpy(laddr.sin6_addr.s6_addr, SECC_LOCALHOST_ADDR, 16);
if (listen(sock, 127) < 0) {
close(sock);
if (chattyv2g) fprintf(stderr, "%s: %m\n", "listen");
return -1;
}
// === Set the dynamic port number if called with pointer ===
if (port != NULL) {
err = getsockname(sock, (struct sockaddr*) &bound_laddr, &bound_laddr_len);
if (err < 0) {
close(sock);
if (chattyv2g) fprintf(stderr, "%s: %m\n", "getsockname");
return -1;
}
*port = (int)ntohs(bound_laddr.sin6_port);
}
return sock;
}
// Handle v2g handshake (exchange of supported app protocols)
int handle_handshake (comboconn_t *cconn, Chan *tc)
{
int err, i, strlen;
exi_string_character_t *str;
struct appHandEXIDocument handshake_req;
struct appHandEXIDocument handshake_resp;
uint16_t buffer_pos = 0;
unsigned char buf[BUFFER_SIZE];
bitstream_t stream = {
.size = BUFFER_SIZE,
.data = buf,
.pos = &buffer_pos,
.buffer = 0,
.capacity = 0, // Set to 8 for send and 0 for recv
};
uint16_t payload_len;
// === Wait for request header ===
err = comboreadn(cconn, buf, V2GTP_HEADER_LENGTH, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: sslreadn error\n");
return -1;
}
err = read_v2gtpHeader(buf, &payload_len);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: invalid v2gtp header\n");
return -1;
}
if ((size_t)payload_len + V2GTP_HEADER_LENGTH > BUFFER_SIZE) {
if (chattyv2g) fprintf(stderr, "Buffer too small for request\n");
return -1;
}
// === Read handshake request ===
err = comboreadn(cconn, buf + V2GTP_HEADER_LENGTH, payload_len, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: sslreadn error\n");
return -1;
}
buffer_pos = V2GTP_HEADER_LENGTH;
err = decode_appHandExiDocument(&stream, &handshake_req);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake error: decode_appHandExiDocument\n");
return -1;
}
// === Validate handshake request ===
err = -1;
for (i = 0; i < handshake_req.supportedAppProtocolReq.AppProtocol.arrayLen ; i++) {
str = handshake_req.supportedAppProtocolReq.AppProtocol.array[0].ProtocolNamespace.characters;
strlen = handshake_req.supportedAppProtocolReq.AppProtocol.array[0].ProtocolNamespace.charactersLen;
if (compare_exi_string_to_string(str, ISO_15118_MSG_DEF, strlen) == 0) {
err = 0;
break;
}
}
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: no supported protocols found\n");
return -1;
}
// === Create response EXI document ===
init_appHandEXIDocument(&handshake_resp);
handshake_resp.supportedAppProtocolRes_isUsed = 1u;
handshake_resp.supportedAppProtocolRes.ResponseCode = appHandresponseCodeType_OK_SuccessfulNegotiation;
handshake_resp.supportedAppProtocolRes.SchemaID = handshake_req.supportedAppProtocolReq.AppProtocol.array[i].SchemaID; /* signal the protocol by the provided schema id*/
handshake_resp.supportedAppProtocolRes.SchemaID_isUsed = 1u;
*stream.pos = V2GTP_HEADER_LENGTH;
stream.capacity = 8; // as it should be for send
err = encode_appHandExiDocument(&stream, &handshake_resp);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: error encoding handshake response\n");
return -1;
}
// === Write response ===
err = write_v2gtpHeader(buf, buffer_pos-V2GTP_HEADER_LENGTH, V2GTP_EXI_TYPE);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: error writing response header\n");
return -1;
}
err = combowriten(cconn, buf, (unsigned int)buffer_pos, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "handle_handshake: sslwriten failed\n");
return -1;
}
return 0;
}
// == Handle a V2GTP request
int secc_handle_request(comboconn_t *cconn, Chan *tc,
handle_func_t handle_func)
{
uint8_t buf[BUFFER_SIZE];
uint16_t payload_len;
uint16_t buffer_pos = 0;
bitstream_t stream = {
.size = BUFFER_SIZE,
.data = buf,
.pos = &buffer_pos,
.buffer = 0,
.capacity = 0, // Set to 8 for send and 0 for recv
};
int err;
err = comboreadn(cconn, buf, V2GTP_HEADER_LENGTH, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request: sslreadn error\n");
return -1;
}
err = read_v2gtpHeader(buf, &payload_len);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request error: read_v2gtpHeader\n");
return -1;
}
if ((size_t)payload_len + V2GTP_HEADER_LENGTH > BUFFER_SIZE) {
if (chattyv2g) fprintf(stderr, "secc_handle_request error: Buffer too small for request\n");
return -1;
}
err = comboreadn(cconn, buf + V2GTP_HEADER_LENGTH, payload_len, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request error: comboreadn\n");
return -1;
}
struct v2gEXIDocument exi_in;
struct v2gEXIDocument exi_out;
err = deserializeStream2EXI(&stream, &exi_in);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request: handle decoding error\n");
return -1;
}
memset(&exi_out, 0, sizeof(exi_out));
// === Call the user-defined handle function ===
err = handle_func(&exi_in, &exi_out, cconn->tls_enabled);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request: external handle_func returned error\n");
return -1;
}
stream.capacity = 8;
err = serializeEXI2Stream(&exi_out, &stream);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request: invalid response, unable to encode\n");
return -1;
}
//=== Write response ===
err = combowriten(cconn, buf, (unsigned int) *stream.pos, tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_request: combowriten failed\n");
return -1;
}
if (chattyv2g) fprintf(stderr, "Succesful request\n");
return 0;
}
typedef struct {
int sockfd;
handle_func_t handle_func;
const char *crt_path;
const char *key_path;
} secc_listen_args_t;
// === Handle a single TCP connection ===
void secc_handle_tcp(void *vargs)
{
secc_listen_args_t *args = (secc_listen_args_t*)vargs;
handle_func_t handle_func = args->handle_func;
int sockfd = args->sockfd;
int err;
Chan tc;
comboconn_t cconn = {.tls_enabled = false,
.sockfd = sockfd};
rendez(vargs, NULL);
err = tchaninit(&tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_tcp: tchaninit error\n");
goto exit;
}
tchanset(&tc, (uvlong)V2G_SECC_Sequence_Timeout * TIME_SECOND);
err = handle_handshake(&cconn, &tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_tcp error: handle_handshake");
goto exit;
}
for(;;) {
tchanset(&tc, (uvlong)V2G_SECC_Sequence_Timeout * TIME_SECOND);
err = secc_handle_request(&cconn, &tc, handle_func);
if (err != 0) {
break;
}
}
exit:
if (sockfd != -1) {
shutdown(sockfd, 2);
close(sockfd);
}
chanfree(&tc);
}
// === Handle a single TLS connection ===
void secc_handle_tls(void *arg)
{
struct handletls_args_t *targs = arg;
int err;
const char *pers = "secc_ssl_server";
ctr_drbg_context ctr_drbg;
bool close_notify = false;
Chan tc;
int sockfd = targs->fd;
struct tls_global_params_t *tlsp = targs->global;
comboconn_t cconn = {.tls_enabled = true};
rendez(arg, NULL);
ssl_context *ssl = &cconn.ssl;
//=====================================
// TLS connection setup
//=====================================
memset(ssl, 0, sizeof(ssl_context));
memset(&ctr_drbg, 0, sizeof(ctr_drbg_context));
// === Setup random number generator for tls ===
err = ctr_drbg_init(&ctr_drbg, entropy_func, &tlsp->entropy,
(const unsigned char*)pers,
strlen(pers));
if (err != 0) {
if (chattyv2g) fprintf(stderr, "failed\n ! ctr_drbg_init returned %d\n", err);
goto exit;
}
// === Setup ssl connection ===
if (chattyv2g) fprintf(stderr, "init ssl connection\n");
err = ssl_init(ssl);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "failed\n ! ssl_init returned %d\n\n", err);
goto exit;
}
ssl_set_endpoint(ssl, SSL_IS_SERVER);
if (IGNORE_SSL_CERTIFICATE_VALIDITY) {
// DONT CHECK CERTS DUE TO TESTING!!
ssl_set_authmode(ssl, SSL_VERIFY_NONE);
} else {
ssl_set_authmode(ssl, SSL_VERIFY_REQUIRED);
}
ssl_set_rng(ssl, ctr_drbg_random, &ctr_drbg);
ssl_set_dbg(ssl, my_debug, stdout);
ssl_set_bio(ssl, net_recv, &sockfd,
net_send, &sockfd);
ssl_set_session_cache(ssl, ssl_cache_get, &tlsp->cache,
ssl_cache_set, &tlsp->cache);
ssl_set_ca_chain(ssl, &tlsp->trusted_client_rootcerts, NULL, NULL);
if ((err = ssl_set_own_cert(ssl, &tlsp->srvcert, &tlsp->pkey)) != 0) {
if (chattyv2g) fprintf(stderr, " failed\n ! ssl_set_own_cert returned %d\n\n", err);
goto exit;
}
ssl_set_ciphersuites(ssl, V2G_CIPHER_SUITES);
// === Perform SSL handshake ===
if (chattyv2g) fprintf(stderr, "starting ssl handshake\n");
while ((err = ssl_handshake(ssl)) != 0) {
if (err != POLARSSL_ERR_NET_WANT_READ &&
err != POLARSSL_ERR_NET_WANT_WRITE) {
if (chattyv2g) fprintf(stderr, "failed\n ! ssl_handshake returned %d\n\n", err);
if (chattyv2g) print_mbedtls_err(err);
if(chattyv2g) debug_sslhandshake(ssl);
goto exit;
}
}
err = tchaninit(&tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_tls: tchaninit error\n");
goto exit;
}
tchanset(&tc, (uvlong)V2G_SECC_Sequence_Timeout * TIME_SECOND);
close_notify = true;
err = handle_handshake(&cconn, &tc);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_handle_tls error: handle_handshake");
goto exit;
}
for(;;) {
tchanset(&tc, (uvlong)V2G_SECC_Sequence_Timeout * TIME_SECOND);
err = secc_handle_request(&cconn, &tc, tlsp->handle_func);
if (err != 0) {
break;
}
}
// === Shutdown TLS connection ===
exit:
if (close_notify) {
ssl_close_notify(ssl);
chanfree(&tc); //when closenotify is set, chan is always init'd
}
if (sockfd != -1) {
shutdown(sockfd, 2);
close(sockfd);
}
ctr_drbg_free(&ctr_drbg);
ssl_free(ssl);
if (chattyv2g) fprintf(stderr, "closing connection to client\n");
}
typedef struct{
int sockfd;
handle_func_t handle_func;
} handletcp_args_t ;
void secc_listen_tcp_child(void *vargs)
{
int err;
secc_listen_args_t *args = (secc_listen_args_t*) vargs;
int sockfd = args->sockfd;
handletcp_args_t handle_args = {.handle_func = args->handle_func};
rendez(vargs, NULL);
for (;;) {
struct sockaddr_in6 raddr;
unsigned int raddr_len = sizeof(raddr);
// === Wait for a connection ===
handle_args.sockfd = accept(sockfd, (struct sockaddr*) &raddr, &raddr_len);
if (handle_args.sockfd < 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "accept");
return;
}
if (chattyv2g) fprintf(stderr, "accepted connection\n");
err = threadcreate(secc_handle_tcp, &handle_args, 1024 * 1024);
if (err < 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "threadcreate");
abort();
};
rendez(&handle_args, NULL);
}
}
// Listen for new connections
void secc_listen_tls_child(void *vargs)
{
int err;
secc_listen_args_t *listen_args = (secc_listen_args_t*) vargs;
int sockfd = listen_args->sockfd;
handle_func_t handle_func = listen_args->handle_func;
struct handletls_args_t handle_args;
struct tls_global_params_t *tlsp;
tlsp = (struct tls_global_params_t*)malloc(sizeof(struct tls_global_params_t));
if (tlsp == NULL) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "secc_listen_tls, malloc error");
rendez(vargs, NULL);
return;
}
// === Init ===
tlsp->handle_func = handle_func;
ssl_cache_init(&tlsp->cache);
entropy_init(&tlsp->entropy);
err = entropy_gather(&tlsp->entropy);
if (err != 0) {
if (chattyv2g) fprintf(stderr, "secc_listen_tls, entropy gather error\n");
rendez(vargs, NULL);
return ;
}
x509_crt_init(&tlsp->srvcert);
pk_init(&tlsp->pkey);
// === Parse certificate and .key file ===
err = x509_crt_parse_file(&tlsp->srvcert, listen_args->crt_path);
if (err != 0) {
if (chattyv2g) fprintf(stderr, " failed\n ! x509_crt_parse returned %d\n\n", err);
rendez(vargs, NULL);
return ;
}
err = x509_crt_parse_path(&tlsp->trusted_client_rootcerts,
"certs/root/oem/certs/");
if (err != 0) {
if (chattyv2g) fprintf(stderr, "evcc_connect_tls: unable to parse trusted root certificates %d\n\n", err);
rendez(vargs, NULL);
return;
}
err = pk_parse_keyfile(&tlsp->pkey, listen_args->key_path, NULL);
if (err != 0) {
if (chattyv2g) fprintf(stderr, " failed\n ! pk_parse_key returned %d\n\n", err);
rendez(vargs, NULL);
return ;
}
handle_args.global = tlsp;
rendez(vargs, NULL);
// === TLS listen loop ===
if (chattyv2g) fprintf(stderr, "start TLS listen\n");
for (;;) {
struct sockaddr_in6 raddr;
unsigned int raddr_len = sizeof(raddr);
// === Wait for a connection ===
handle_args.fd = accept(sockfd, (struct sockaddr*) &raddr, &raddr_len);
if (handle_args.fd < 0) {
if (chattyv2g) fprintf(stderr, "%s: %m\n", "accept");