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#ifndef NDPISRVD_H
#define NDPISRVD_H 1
#include <arpa/inet.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include "config.h"
#include "jsmn/jsmn.h"
struct nDPIsrvd_socket
{
int fd;
int socket_family;
union {
struct
{
char const * dst_ip;
unsigned short dst_port;
} ip_socket;
struct
{
char * path;
} unix_socket;
} address;
struct
{
char raw[NETWORK_BUFFER_MAX_SIZE];
size_t used;
char * json_string;
size_t json_string_start;
unsigned long long int json_string_length;
} buffer;
struct
{
jsmn_parser parser;
jsmntok_t tokens[128];
int current_token;
int tokens_found;
} jsmn;
};
#define FIRST_ENUM_VALUE 1
enum nDPIsrvd_connect_return
{
CONNECT_OK = FIRST_ENUM_VALUE,
CONNECT_ERROR_SOCKET,
CONNECT_ERROR_PTON,
CONNECT_ERROR,
CONNECT_LAST_ENUM_VALUE
};
enum nDPIsrvd_read_return
{
READ_OK = CONNECT_LAST_ENUM_VALUE,
READ_PEER_DISCONNECT,
READ_ERROR,
READ_LAST_ENUM_VALUE
};
enum nDPIsrvd_parse_return
{
PARSE_OK = READ_LAST_ENUM_VALUE,
PARSE_INVALID_OPENING_CHAR,
PARSE_SIZE_EXCEEDS_CONVERSION_LIMIT,
PARSE_SIZE_MISSING,
PARSE_STRING_TOO_BIG,
PARSE_INVALID_CLOSING_CHAR,
PARSE_JSMN_ERROR,
PARSE_LAST_ENUM_VALUE
};
enum nDPIsrvd_callback_return
{
CALLBACK_OK = PARSE_LAST_ENUM_VALUE,
CALLBACK_ERROR,
CALLBACK_LAST_ENUM_VALUE
};
typedef enum nDPIsrvd_callback_return (*json_callback)(struct nDPIsrvd_socket * const sock, void * user_data);
static inline struct nDPIsrvd_socket * nDPIsrvd_init(void)
{
struct nDPIsrvd_socket * sock = (struct nDPIsrvd_socket *)malloc(sizeof(*sock));
if (sock != NULL)
{
sock->fd = -1;
sock->socket_family = -1;
}
return sock;
}
static inline enum nDPIsrvd_connect_return nDPIsrvd_connect_ip(struct nDPIsrvd_socket * const sock,
char const * dst_ip,
unsigned short dst_port)
{
struct sockaddr_in remote_addr = {};
sock->socket_family = remote_addr.sin_family = AF_INET;
sock->fd = socket(sock->socket_family, SOCK_STREAM, 0);
if (sock->fd < 0)
{
return CONNECT_ERROR_SOCKET;
}
if (inet_pton(sock->socket_family, &dst_ip[0], &remote_addr.sin_addr) != 1)
{
return CONNECT_ERROR_PTON;
}
remote_addr.sin_port = htons(dst_port);
if (connect(sock->fd, (struct sockaddr *)&remote_addr, sizeof(remote_addr)) != 0)
{
return CONNECT_ERROR;
}
return CONNECT_OK;
}
static inline enum nDPIsrvd_connect_return nDPIsrvd_connect_unix(struct nDPIsrvd_socket * const sock,
char const * const path)
{
(void)sock;
(void)path;
return CONNECT_OK;
}
static inline enum nDPIsrvd_read_return nDPIsrvd_read(struct nDPIsrvd_socket * const sock)
{
ssize_t bytes_read =
read(sock->fd, sock->buffer.raw + sock->buffer.used, sizeof(sock->buffer.raw) - sock->buffer.used);
if (bytes_read == 0)
{
return READ_PEER_DISCONNECT;
}
if (bytes_read < 0)
{
return READ_ERROR;
}
sock->buffer.used += bytes_read;
return READ_OK;
}
static inline enum nDPIsrvd_parse_return nDPIsrvd_parse(struct nDPIsrvd_socket * const sock,
json_callback cb,
void * user_data)
{
while (sock->buffer.used >= nDPIsrvd_JSON_BYTES + 1)
{
if (sock->buffer.raw[nDPIsrvd_JSON_BYTES] != '{')
{
return PARSE_INVALID_OPENING_CHAR;
}
errno = 0;
sock->buffer.json_string_length = strtoull((const char *)sock->buffer.raw, &sock->buffer.json_string, 10);
sock->buffer.json_string_length += sock->buffer.json_string - sock->buffer.raw;
sock->buffer.json_string_start = sock->buffer.json_string - sock->buffer.raw;
if (errno == ERANGE)
{
return PARSE_SIZE_EXCEEDS_CONVERSION_LIMIT;
}
if (sock->buffer.json_string == sock->buffer.raw)
{
return PARSE_SIZE_MISSING;
}
if (sock->buffer.json_string_length > sizeof(sock->buffer.raw))
{
return PARSE_STRING_TOO_BIG;
}
if (sock->buffer.json_string_length > sock->buffer.used)
{
break;
}
if (sock->buffer.raw[sock->buffer.json_string_length - 1] != '}')
{
return PARSE_INVALID_CLOSING_CHAR;
}
jsmn_init(&sock->jsmn.parser);
sock->jsmn.tokens_found = jsmn_parse(&sock->jsmn.parser,
(char *)(sock->buffer.raw + sock->buffer.json_string_start),
sock->buffer.json_string_length - sock->buffer.json_string_start,
sock->jsmn.tokens,
sizeof(sock->jsmn.tokens) / sizeof(sock->jsmn.tokens[0]));
if (sock->jsmn.tokens_found < 0 || sock->jsmn.tokens[0].type != JSMN_OBJECT)
{
return PARSE_JSMN_ERROR;
}
for (sock->jsmn.current_token = 1; sock->jsmn.current_token < sock->jsmn.tokens_found;
sock->jsmn.current_token++)
{
cb(sock, user_data);
}
memmove(sock->buffer.raw,
sock->buffer.raw + sock->buffer.json_string_length,
sock->buffer.used - sock->buffer.json_string_length);
sock->buffer.used -= sock->buffer.json_string_length;
sock->buffer.json_string_length = 0;
sock->buffer.json_string_start = 0;
}
return PARSE_OK;
}
#endif
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