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/*
sockets -- auxiliary socket functions
Copyright (C) 1996, 1997 Dieter Baron
This file is part of cftp, a fullscreen ftp client
The author can be contacted at <dillo@giga.or.at>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include "display.h"
extern char *prg;
#ifndef H_ERRNO_DECLARED
extern int h_errno;
#endif
int
sopen(char *host, char *service)
{
int s;
struct hostent *hp;
struct sockaddr_in sa;
u_short port;
struct servent *serv;
if ((serv = getservbyname(service, "tcp")) == NULL) {
if ((port=atoi(service)) == 0 && service[0] != '0') {
if (disp_active)
disp_status("unknown service: %s", service);
else
fprintf(stderr, "%s: unknown service: %s\n",
prg, service);
return(-1);
}
else
port = htons(port);
}
else
port = (u_short)serv->s_port;
if ((hp = gethostbyname(host)) == NULL) {
if (disp_active)
disp_status("can't get host %s: %s",
host, hstrerror(h_errno));
else
fprintf(stderr, "%s: can't get host %s: %s\n",
prg, host, hstrerror(h_errno));
return(-1);
}
memcpy(&sa.sin_addr, hp->h_addr, hp->h_length);
sa.sin_family = hp->h_addrtype;
sa.sin_port = port;
if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
if (disp_active)
disp_status("can't allocate socket: %s\n",
strerror(errno));
else
fprintf(stderr, "%s: can't allocate socket: %s\n",
prg, strerror(errno));
return(-1);
}
if (connect(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
if (disp_active)
disp_status("can't connect: %s", strerror(errno));
else
fprintf(stderr, "%s: can't connect: %s\n",
prg, strerror(errno));
return(-1);
}
return(s);
}
int
spassive(unsigned long *host, int *port)
{
int s, len;
struct sockaddr_in locaddr;
extern int getport();
if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
fprintf(stderr, "%s: can't allocate socket: %s\n",
prg, strerror(errno));
return(-1);
}
locaddr.sin_family = AF_INET;
locaddr.sin_addr.s_addr = INADDR_ANY;
memset(locaddr.sin_zero, 0, 8);
locaddr.sin_port = 0;
if (bind(s, (struct sockaddr *)&locaddr, sizeof(struct sockaddr_in))
== -1) {
fprintf(stderr, "%s: can't bind socket: %s\n",
prg, strerror(errno));
return(-1);
}
len = sizeof(locaddr);
if (getsockname(s, (struct sockaddr *)&locaddr, &len) == -1) {
fprintf(stderr, "%s: can't get socket name: %s\n",
prg, strerror(errno));
return(-1);
}
*host = (unsigned long)locaddr.sin_addr.s_addr;
*port = ntohs(locaddr.sin_port);
if (listen(s, 1) == -1) {
fprintf(stderr, "%s: can't listen on socket: %s\n",
prg, strerror(errno));
return(-1);
}
return s;
}
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