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/*
* ser2net - A program for allowing telnet connection to serial ports
* Copyright (C) 2001 Corey Minyard <minyard@acm.org>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* This file holds basic utilities used by the ser2net program. */
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "utils.h"
/* Scan for a positive integer, and return it. Return -1 if the
integer was invalid. */
int
scan_int(char *str)
{
int rv = 0;
if (*str == '\0') {
return -1;
}
for (;;) {
switch (*str) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
rv = (rv * 10) + ((*str) - '0');
break;
case '\0':
return rv;
default:
return -1;
}
str++;
}
return rv;
}
/* Scan for a TCP port in the form "[x.x.x.x,]x" where the first part is
the IP address (options, defaults to INADDR_ANY) and the second part
is the port number (required). */
int
scan_tcp_port(char *str, struct sockaddr_in *addr)
{
char *strtok_data;
char *ip;
char *port;
int port_num;
ip = strtok_r(str, ",", &strtok_data);
port = strtok_r(NULL, "", &strtok_data);
if (port == NULL) {
port = ip;
ip = NULL;
addr->sin_addr.s_addr = INADDR_ANY;
port_num = scan_int(port);
if (port_num == -1) {
return -1;
}
addr->sin_port = htons(port_num);
} else {
/* Both an IP and port were specified. */
addr->sin_addr.s_addr = inet_addr(ip);
if (addr->sin_addr.s_addr == INADDR_NONE) {
struct hostent *hp;
hp = gethostbyname(ip);
if (hp == NULL) {
return -1;
}
if (hp->h_addrtype != AF_INET) {
return -1;
}
memcpy(&addr->sin_addr, hp->h_addr_list[0], hp->h_length);
}
port_num = scan_int(port);
if (port_num == -1) {
return -1;
}
addr->sin_port = htons(port_num);
}
addr->sin_family = AF_INET;
return 0;
}
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