libsigrok/hardware/common/scpi_tcp.c

237 lines
5.1 KiB
C

/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 Martin Ling <martin-sigrok@earth.li>
*
* 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/>.
*/
#ifdef _WIN32
#define _WIN32_WINNT 0x0501
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include <glib.h>
#include <string.h>
#include <unistd.h>
#ifndef _WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#include <errno.h>
#define LOG_PREFIX "scpi_tcp"
#define LENGTH_BYTES 4
struct scpi_tcp {
char *address;
char *port;
int socket;
char length_buf[LENGTH_BYTES];
int length_bytes_read;
int response_length;
int response_bytes_read;
};
SR_PRIV int scpi_tcp_open(void *priv)
{
struct scpi_tcp *tcp = priv;
struct addrinfo hints;
struct addrinfo *results, *res;
int err;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
err = getaddrinfo(tcp->address, tcp->port, &hints, &results);
if (err) {
sr_err("Address lookup failed: %s:%d: %s", tcp->address, tcp->port,
gai_strerror(err));
return SR_ERR;
}
for (res = results; res; res = res->ai_next) {
if ((tcp->socket = socket(res->ai_family, res->ai_socktype,
res->ai_protocol)) < 0)
continue;
if (connect(tcp->socket, res->ai_addr, res->ai_addrlen) != 0) {
close(tcp->socket);
tcp->socket = -1;
continue;
}
break;
}
freeaddrinfo(results);
if (tcp->socket < 0) {
sr_err("Failed to connect to %s:%s: %s", tcp->address, tcp->port,
strerror(errno));
return SR_ERR;
}
return SR_OK;
}
SR_PRIV int scpi_tcp_source_add(void *priv, int events, int timeout,
sr_receive_data_callback_t cb, void *cb_data)
{
struct scpi_tcp *tcp = priv;
return sr_source_add(tcp->socket, events, timeout, cb, cb_data);
}
SR_PRIV int scpi_tcp_source_remove(void *priv)
{
struct scpi_tcp *tcp = priv;
return sr_source_remove(tcp->socket);
}
SR_PRIV int scpi_tcp_send(void *priv, const char *command)
{
struct scpi_tcp *tcp = priv;
int len, out;
char *terminated_command;
terminated_command = g_strdup_printf("%s\r\n", command);
len = strlen(terminated_command);
out = send(tcp->socket, terminated_command, len, 0);
g_free(terminated_command);
if (out < 0) {
sr_err("Send error: %s", strerror(errno));
return SR_ERR;
}
if (out < len) {
sr_dbg("Only sent %d/%d bytes of SCPI command: '%s'.", out,
len, command);
}
sr_spew("Successfully sent SCPI command: '%s'.", command);
return SR_OK;
}
SR_PRIV int scpi_tcp_read_begin(void *priv)
{
struct scpi_tcp *tcp = priv;
tcp->response_bytes_read = 0;
tcp->length_bytes_read = 0;
return SR_OK;
}
SR_PRIV int scpi_tcp_read_data(void *priv, char *buf, int maxlen)
{
struct scpi_tcp *tcp = priv;
int len;
if (tcp->length_bytes_read < LENGTH_BYTES) {
len = recv(tcp->socket, tcp->length_buf + tcp->length_bytes_read,
LENGTH_BYTES - tcp->length_bytes_read, 0);
if (len < 0) {
sr_err("Receive error: %s", strerror(errno));
return SR_ERR;
}
tcp->length_bytes_read += len;
if (tcp->length_bytes_read < LENGTH_BYTES)
return 0;
else
tcp->response_length = RL32(tcp->length_buf);
}
if (tcp->response_bytes_read >= tcp->response_length)
return SR_ERR;
len = recv(tcp->socket, buf, maxlen, 0);
if (len < 0) {
sr_err("Receive error: %s", strerror(errno));
return SR_ERR;
}
tcp->response_bytes_read += len;
return len;
}
SR_PRIV int scpi_tcp_read_complete(void *priv)
{
struct scpi_tcp *tcp = priv;
return (tcp->length_bytes_read == LENGTH_BYTES &&
tcp->response_bytes_read >= tcp->response_length);
}
SR_PRIV int scpi_tcp_close(void *priv)
{
struct scpi_tcp *tcp = priv;
if (close(tcp->socket) < 0)
return SR_ERR;
return SR_OK;
}
SR_PRIV void scpi_tcp_free(void *priv)
{
struct scpi_tcp *tcp = priv;
g_free(tcp->address);
g_free(tcp->port);
g_free(tcp);
}
SR_PRIV struct sr_scpi_dev_inst *scpi_tcp_dev_inst_new(const char *address,
const char *port)
{
struct sr_scpi_dev_inst *scpi;
struct scpi_tcp *tcp;
scpi = g_malloc(sizeof(struct sr_scpi_dev_inst));
tcp = g_malloc0(sizeof(struct scpi_tcp));
tcp->address = g_strdup(address);
tcp->port = g_strdup(port);
tcp->socket = -1;
scpi->open = scpi_tcp_open;
scpi->source_add = scpi_tcp_source_add;
scpi->source_remove = scpi_tcp_source_remove;
scpi->send = scpi_tcp_send;
scpi->read_begin = scpi_tcp_read_begin;
scpi->read_data = scpi_tcp_read_data;
scpi->read_complete = scpi_tcp_read_complete;
scpi->close = scpi_tcp_close;
scpi->free = scpi_tcp_free;
scpi->priv = tcp;
return scpi;
}