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/******************************************************************
** File: telnet.c
** Description: the telnet part for microcom project
**
** Copyright (C) 2008, 2009 Sascha Hauer <s.hauer@pengutronix.de>.
** All rights reserved.
****************************************************************************
** 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 2
** 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 at www.gnu.org
****************************************************************************/
#include <stdlib.h>
#include <arpa/telnet.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "microcom.h"
static ssize_t telnet_write(struct ios_ops *ios, const void *buf, size_t count)
{
return write(ios->fd, buf, count);
}
static ssize_t telnet_read(struct ios_ops *ios, void *buf, size_t count)
{
return read(ios->fd, buf, count);
}
static int telnet_set_speed(struct ios_ops *ios, unsigned long speed)
{
unsigned char buf2[] = {IAC, SB, TELNET_OPTION_COM_PORT_CONTROL, SET_BAUDRATE_CS, 0, 0, 0, 0, IAC, SE};
int *speedp = (int *)&buf2[4];
*speedp = htonl(speed);
dbg_printf("-> IAC SB COM_PORT_CONTROL SET_BAUDRATE_CS 0x%lx IAC SE\n", speed);
write(ios->fd, buf2, 10);
return 0;
}
static int telnet_set_flow(struct ios_ops *ios, int flow)
{
unsigned char buf2[] = {IAC, SB, TELNET_OPTION_COM_PORT_CONTROL, SET_CONTROL_CS, 0, IAC, SE};
switch (flow) {
case FLOW_NONE:
/* no flow control */
buf2[4] = 1;
break;
case FLOW_SOFT:
/* software flow control */
buf2[4] = 2;
break;
case FLOW_HARD:
/* hardware flow control */
buf2[4] = 3;
break;
}
dbg_printf("-> IAC SB COM_PORT_CONTROL SET_CONTROL_CS %d IAC SE\n", buf2[4]);
write(ios->fd, buf2, sizeof(buf2));
return 0;
}
static int telnet_send_break(struct ios_ops *ios)
{
unsigned char buf2[] = {IAC, BREAK};
write(ios->fd, buf2, sizeof(buf2));
return 0;
}
static void telnet_exit(struct ios_ops *ios)
{
close(ios->fd);
free(ios);
}
struct ios_ops *telnet_init(char *hostport)
{
char *port;
int ret;
struct addrinfo *addrinfo, *ai;
struct addrinfo hints;
struct ios_ops *ios;
char connected_host[256], connected_port[30];
ios = malloc(sizeof(*ios));
if (!ios)
return NULL;
ios->write = telnet_write;
ios->read = telnet_read;
ios->set_speed = telnet_set_speed;
ios->set_flow = telnet_set_flow;
ios->send_break = telnet_send_break;
ios->exit = telnet_exit;
ios->istelnet = true;
memset(&hints, '\0', sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = SOCK_STREAM;
if (hostport[0] == '[') {
char *s = strchr(++hostport, ']');
if (s)
/* terminate hostport after host portion */
*s = '\0';
if (s && s[1] == ':')
port = s + 2;
else if (s && s[1] == '\0')
port = "23";
else {
fprintf(stderr, "failed to parse host:port");
free(ios);
return NULL;
}
} else {
port = strchr(hostport, ':');
if (port) {
/* terminate hostport after host portion */
*port = '\0';
port += 1;
} else
port = "23";
}
ret = getaddrinfo(hostport, port, &hints, &addrinfo);
if (ret) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
return NULL;
}
for (ai = addrinfo; ai != NULL; ai = ai->ai_next) {
int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0)
continue;
if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
close(sock);
continue;
}
ios->fd = sock;
ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
connected_host, sizeof(connected_host),
connected_port, sizeof(connected_port),
NI_NUMERICHOST | NI_NUMERICSERV);
if (ret) {
fprintf(stderr, "getnameinfo: %s\n", gai_strerror(ret));
goto out;
}
printf("connected to %s (port %s)\n", connected_host, connected_port);
/* send intent to do and accept COM_PORT stuff */
dbg_printf("-> WILL COM_PORT_CONTROL\n");
dprintf(sock, "%c%c%c", IAC, WILL, TELNET_OPTION_COM_PORT_CONTROL);
dbg_printf("-> DO COM_PORT_CONTROL\n");
dprintf(sock, "%c%c%c", IAC, DO, TELNET_OPTION_COM_PORT_CONTROL);
goto out;
}
perror("failed to connect");
free(ios);
ios = NULL;
out:
freeaddrinfo(addrinfo);
return ios;
}
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