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vt_ccq_pipe.cc
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/*
* Copyright ViewTouch, Inc., 1995, 1996, 1997, 1998
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* vt_ccq_pipe.cc
* Socket<-->serial pipe to allow the CreditCheq application to communicate
* with the PINPad. Just receives from a socket, sends to the serial port,
* waits for a response from the serial port, sends the response to the
* socket. And vice versa.
*/
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include "vt_ccq_pipe.hh"
#include "socket.hh"
#include "utility.hh"
#ifdef DMALLOC
#include <dmalloc.h>
#endif
#define SOCK_PORT 9999
#define STX 0x02
#define ETX 0x03
#define ENQ 0x05
#define ACK 0x06
#define NAK 0x15
#define ETB 0x17
#define CAN 0x18
#define ERR_NONE 0
#define ERR_SERVER 1
#define ERR_PINPAD 2
#define ERR_SELECT 3
#define ERR_TIMEOUT 4
#ifdef LINUX
char serial_device[STRLENGTH] = "/dev/ttyS0";
#elif defined BSD
char serial_device[STRLENGTH] = "/dev/ttyd0";
#endif
int socket_port = SOCK_PORT;
int pinpad_port = 0;
char pinpad_host[STRLENGTH] = "";
int diagnostics = 0;
int use_rtscts = 0;
int time_limit = 0; // time limit for inactive connection
int check_interval = 0; // how often to check if time limit is exceeded
int SocketToSerial(int listen_fd, const char* pinpad_device);
int SocketToSocket(int listen_fd, const char* host, int port);
int OpenSerial(const char* serial_port);
void ShowHelp(const char* progname);
int ParseArguments(int argc, const char* argv[]);
int ProcessConnection(int sockfd, int serialfd);
int ReadCmd(int fd, const char* dest, int destlen);
int Read(int fd, const char* buffer, int bufflen);
int Write(int fd, const char* buffer, int bufflen);
void PrintRead(const char* label, const char* buffer, int bufflen);
/*********************************************************************
* Main Loop
********************************************************************/
int main(int argc, const char* argv[])
{
int retval = 0;
// let's ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
ParseArguments(argc, argv);
if (pinpad_port && pinpad_host[0] != '\0')
retval = SocketToSocket(socket_port, pinpad_host, pinpad_port);
else
retval = SocketToSerial(socket_port, serial_device);
return retval;
}
/*********************************************************************
* Subroutines
********************************************************************/
/****
* SocketToSerial:
****/
int SocketToSerial(int listen_port, const char* pinpad_device)
{
int retval = 0;
int listen_fd = -1;
int pinpad_fd = -1;
int server_fd;
fd_set in_fds;
int nfds = 0;
struct timeval timeout;
char serial_in[STRLENGTH];
int serial_bytes;
int reads;
char ack_response[] = { ACK, 0x00 };
char server_ip[STRLENGTH];
int errval;
/* now loop forever */
while (1)
{
if (pinpad_fd <= 0)
{
pinpad_fd = OpenSerial(pinpad_device);
tcflush(pinpad_fd, TCIOFLUSH);
tcsendbreak(pinpad_fd, 0);
if (diagnostics && pinpad_fd > 0)
printf("Opened Device %s, File Descriptor %d\n", pinpad_device, pinpad_fd);
else if (pinpad_fd <= 0)
sleep(1);
}
else if (listen_fd <= 0)
{
listen_fd = Listen(listen_port);
if (diagnostics && listen_fd > 0)
printf("Listening on Port: %d\n", listen_port);
else if (listen_fd <= 0)
{
if (errno == EADDRINUSE)
exit(1);
else
sleep(1);
}
}
else
{
nfds = MAX(nfds, pinpad_fd);
nfds = MAX(nfds, listen_fd);
nfds += 1;
FD_ZERO(&in_fds);
FD_SET(pinpad_fd, &in_fds);
FD_SET(listen_fd, &in_fds);
timeout.tv_sec = 0;
timeout.tv_usec = 10;
reads = select(nfds, &in_fds, NULL, NULL, &timeout);
if (reads > 0)
{
if (FD_ISSET(pinpad_fd, &in_fds))
{
// out here we probably have an ENQ, need to respond with ACK
serial_bytes = Read(pinpad_fd, serial_in, STRLENGTH);
if (serial_bytes > 0 && serial_in[0] == ENQ)
{
if (diagnostics)
printf("Sending ACK to ENQ\n");
serial_bytes = Write(pinpad_fd, ack_response, strlen(ack_response));
}
}
else if (FD_ISSET(listen_fd, &in_fds))
{
server_fd = Accept(listen_fd, server_ip);
if (server_fd >= 0)
{
if (diagnostics)
printf("Accepted a socket from %s\n", server_ip);
errval = ProcessConnection(server_fd, pinpad_fd);
close(server_fd);
if (errval == ERR_PINPAD)
{
close(pinpad_fd);
pinpad_fd = -1;
}
else if (errval == ERR_TIMEOUT)
{
printf("Timed out, resetting connection...\n");
}
}
}
}
}
}
if (listen_fd < 0)
retval += 1;
if (pinpad_fd < 0)
retval += 2;
return retval;
}
/****
* SocketToSocket:
****/
int SocketToSocket(int listen_port, const char* host, int port)
{
int retval = 0;
int listen_fd = -1;
int pinpad_fd = -1;
int server_fd;
fd_set in_fds;
int nfds = 0;
struct timeval timeout;
int reads;
char server_ip[STRLENGTH];
int errval = 0;
// now loop forever
while (1)
{
if (pinpad_fd <= 0)
{
pinpad_fd = Connect(host, port);
if (diagnostics && pinpad_fd > 0)
printf("Connected to: %s:%d\n", host, port);
else if (pinpad_fd <= 0)
sleep(1);
}
else if (listen_fd <= 0)
{
listen_fd = Listen(listen_port);
if (diagnostics && listen_fd > 0)
printf("Listening on Port: %d\n", listen_port);
else if (listen_fd <= 0)
{
if (errno == EADDRINUSE)
exit(1);
else
sleep(1);
}
}
else
{
// the server always initiates the connection, so we'll
// only select() on that descriptor
nfds = MAX(nfds, listen_fd);
nfds += 1;
FD_ZERO(&in_fds);
FD_SET(listen_fd, &in_fds);
timeout.tv_sec = 0;
timeout.tv_usec = 10;
reads = select(nfds, &in_fds, NULL, NULL, &timeout);
if (reads > 0)
{
if (FD_ISSET(listen_fd, &in_fds))
{
server_fd = Accept(listen_fd, server_ip);
if (server_fd >= 0)
{
if (diagnostics)
printf("Accepted a socket from %s\n", server_ip);
errval = ProcessConnection(server_fd, pinpad_fd);
if (errval == ERR_PINPAD)
{
close(pinpad_fd);
pinpad_fd = -1;
}
close(server_fd);
}
}
}
}
}
if (listen_fd < 0)
retval += 1;
if (pinpad_fd < 0)
retval += 2;
return retval;
}
/****
* OpenSerial:
****/
int OpenSerial(const char* serial_port)
{
int serial_fd = -1;
struct termios options;
serial_fd = open(serial_port, O_RDWR | O_NOCTTY | O_NDELAY);
if (serial_fd > -1)
{
// 7E1 4800
tcgetattr(serial_fd, &options);
cfsetispeed(&options, B4800);
cfsetospeed(&options, B4800);
options.c_cflag |= PARENB;
options.c_cflag &= ~PARODD;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS7;
options.c_cflag &= ~CRTSCTS;
options.c_cflag |= CLOCAL;
options.c_cflag |= CREAD;
options.c_lflag &= ~ECHO;
options.c_lflag &= ~ICANON;
options.c_lflag &= ~ISIG;
options.c_lflag &= ~IEXTEN;
options.c_iflag &= ~BRKINT;
options.c_iflag &= ~ICRNL;
options.c_iflag &= ~INPCK;
options.c_iflag &= ~ISTRIP;
options.c_iflag &= ~IXON;
options.c_oflag &= ~OPOST;
options.c_cc[VMIN] = 1;
options.c_cc[VTIME] = 0;
tcsetattr(serial_fd, TCSANOW, &options);
}
else
perror("OpenSerial");
return serial_fd;
}
/****
* ShowHelp:
****/
void ShowHelp(const char* progname)
{
printf("\n");
printf("Usage: %s [OPTIONS]\n", progname);
printf(" -c<time limit> How long to wait between timeout checks (default %d seconds)\n", check_interval);
printf(" -d<device> Serial device (default %s)\n", serial_device);
printf(" -D Diagnostics mode; extra messages\n");
printf(" -f Enable RTS/CTS flow control\n");
printf(" -h Show this help screen\n");
printf(" -p<port> Set the listening port (default %d)\n", socket_port);
printf(" -P<port> PINPad port (default none)\n");
printf(" -s<ip address> PINPad host address\n");
printf(" -t<time limit> How long to wait before resetting (default %d seconds)\n", time_limit);
printf("\n");
printf("Note: there can be no spaces between an option and the associated\n");
printf("argument. AKA, it's \"-p6555\" not \"-p 6555\".\n");
printf("\n");
printf("Note: for the -c and -t arguments, 0 is the same as \"never\".\n");
printf("\n");
exit(1);
}
/****
* ParseArguments:
****/
int ParseArguments(int argc, const char* argv[])
{
const char* arg;
int idx = 1; // first command line argument past binary name
int retval = 0;
while (idx < argc)
{
arg = argv[idx];
if (arg[0] == '-')
{
switch (arg[1])
{
case 'c':
check_interval = atoi(&arg[2]);
break;
case 'd':
if (strlen(arg) < STRLENGTH)
strncpy(serial_device, &arg[2], STRLENGTH);
break;
case 'D':
diagnostics += 1;
break;
case 'f':
use_rtscts = 1;
break;
case 'h':
ShowHelp(argv[0]);
break;
case 'p':
socket_port = atoi(&arg[2]);
break;
case 'P':
pinpad_port = atoi(&arg[2]);
break;
case 's':
if (strlen(arg) < STRLENGTH)
strncpy(pinpad_host, &arg[2], STRLENGTH);
break;
case 't':
time_limit = atoi(&arg[2]);
break;
}
}
idx += 1;
}
return retval;
}
/****
* ProcessConnection: We'll assume synchronous, so we alternate
* between server -> pinpad, pinpad -> server.
* Returns
* ERR_NONE
* ERR_PINPAD
* ERR_SERVER
* ERR_SELECT
****/
int ProcessConnection(int serverfd, int pinpadfd)
{
int retval = ERR_NONE;
char buffer[STRLONG];
int readlen = 1;
int writelen = 1;
fd_set in_fds;
int nfds;
int readies = 0;
time_t lastserver = 0;
time_t now;
struct timeval timeout;
nfds = MAX(serverfd, pinpadfd) + 1;
while (retval == 0 && readlen >= 0 && writelen >= 0 && readies >= 0)
{
FD_ZERO(&in_fds);
FD_SET(serverfd, &in_fds);
FD_SET(pinpadfd, &in_fds);
if (check_interval)
{
timeout.tv_sec = check_interval;
timeout.tv_usec = 0;
readies = select(nfds, &in_fds, NULL, NULL, &timeout);
}
else
readies = select(nfds, &in_fds, NULL, NULL, NULL);
if (readies < 0)
{
perror("ProcessConnection select");
retval = ERR_SELECT;
}
else if (readies > 0)
{
if (FD_ISSET(serverfd, &in_fds))
{
// read from server
readlen = ReadCmd(serverfd, buffer, STRLONG);
if (readlen >= 0)
{
lastserver = time(NULL);
// send to pinpad
if (diagnostics)
PrintRead("from Socket", buffer, readlen);
writelen = Write(pinpadfd, buffer, readlen);
if (writelen < 0)
retval = ERR_PINPAD;
}
else
retval = ERR_SERVER;
}
if (readlen >= 0 && writelen >= 0 && FD_ISSET(pinpadfd, &in_fds))
{
// read from pinpad
readlen = ReadCmd(pinpadfd, buffer, STRLONG);
if (readlen >= 0)
{
// send to server
if (diagnostics)
PrintRead("from Serial", buffer, readlen);
writelen = Write(serverfd, buffer, readlen);
if (writelen < 0)
retval = ERR_SERVER;
}
else
retval = ERR_PINPAD;
}
}
else if (lastserver && time_limit)
{ // check for timeouts
now = time(NULL);
if ((now - lastserver) > time_limit)
retval = ERR_TIMEOUT;
}
}
return retval;
}
/****
* ReadCmd: This is reading a command for an Ingenico eN-Crypt 1200,
* the format of which is STX ... ETX LRC. So we discard anything
* up to the STX character (ASCII 0x02) and then gobble everything
* (including STX) through the ETX (ASCII 0x03) and the following
* LRC.
****/
int ReadCmd(int fd, const char* dest, int destlen)
{
int readlen = 0;
int done = 0;
char last = 0x00;
int destidx = 0;
char buffer;
int first = 1;
while (!done && destidx < destlen)
{
readlen = read(fd, &buffer, 1);
if (readlen < 0 && errno != EAGAIN)
{
perror("ReadCmd Error");
destidx = readlen;
done = 1;
}
else if (readlen > 0)
{
dest[destidx] = buffer;
destidx += 1;
if (last == 0x00 && (buffer == ACK || buffer == NAK || buffer == CAN))
done = 1;
else if (last == ETX || last == ETB)
done = 1;
else
last = buffer;
}
else if (first)
{
// this is to catch socket closes. Probably a bad way to do it,
// but in this case we know we're being called after select(),
// so we know there should be data. If select() returns the fd
// as readable, but there's nothing to read, then almost certainly
// the socket is closing (in FIN).
done = 1;
destidx = -1;
if (diagnostics)
printf("ReadCmd Error: socket closed?\n");
}
first = 0;
}
dest[destidx] = '\0';
return destidx;
}
int Read(int fd, const char* buffer, int bufflen)
{
int readlen = 0;
char errbuff[STRLENGTH];
int done = 0;
while (!done)
{
readlen = read(fd, buffer, bufflen);
if (readlen < 0 && errno != EAGAIN)
{
snprintf(errbuff, STRLENGTH, "Read Error %d", errno);
perror(errbuff);
done = 1;
}
else if (readlen >= 0)
{
buffer[readlen] = '\0';
done = 1;
}
}
return readlen;
}
int Write(int fd, const char* buffer, int bufflen)
{
int writelen = 0;
int bytes;
char errbuff[STRLONG];
while (writelen >= 0 && writelen < bufflen)
{
bytes = write(fd, buffer, bufflen);
if (bytes < 0)
{
snprintf(errbuff, STRLONG, "Write Error to File Descriptor %d", fd);
perror(errbuff);
writelen = bytes;
}
else
writelen += bytes;
}
return writelen;
}
void PrintRead(const char* label, const char* buffer, int bufflen)
{
int idx = 0;
printf("Read %s: ", label);
while (idx < bufflen)
{
if (buffer[idx] == STX)
printf("<STX>");
else if (buffer[idx] == ETX)
printf("<ETX>");
else if (buffer[idx] == ACK)
printf("<ACK>");
else if (buffer[idx] == ENQ)
printf("<ENQ>");
else if (buffer[idx] >= 32 && buffer[idx] <= 126)
printf("%c", buffer[idx]);
else
printf(",");
idx += 1;
}
printf("\n");
}