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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2004, 2006, 2007 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <mailutils/errno.h>
#include <mailutils/stream.h>
#include <mailutils/mutil.h>
#define TCP_STATE_INIT 1
#define TCP_STATE_RESOLVE 2
#define TCP_STATE_RESOLVING 3
#define TCP_STATE_CONNECTING 4
#define TCP_STATE_CONNECTED 5
struct _tcp_instance
{
int fd;
char *host;
int port;
int state;
unsigned long address;
unsigned long source_addr;
};
/* On solaris inet_addr() return -1. */
#ifndef INADDR_NONE
# define INADDR_NONE (unsigned long)-1
#endif
static int
_tcp_close (mu_stream_t stream)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
int err = 0;
if (tcp->fd != -1)
{
if (close (tcp->fd) != 0)
{
err = errno;
}
}
tcp->fd = -1;
tcp->state = TCP_STATE_INIT;
return err;
}
static int
resolve_hostname (const char *host, unsigned long *ip)
{
unsigned long address = inet_addr (host);
if (address == INADDR_NONE)
{
struct hostent *phe = gethostbyname (host);
if (!phe)
return MU_ERR_GETHOSTBYNAME;
address = *(((unsigned long **) phe->h_addr_list)[0]);
}
*ip = address;
return 0;
}
static int
_tcp_open (mu_stream_t stream)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
int flgs, ret;
socklen_t namelen;
struct sockaddr_in peer_addr;
struct sockaddr_in soc_addr;
int flags;
mu_stream_get_flags(stream, &flags);
switch (tcp->state)
{
case TCP_STATE_INIT:
if (tcp->fd == -1)
{
if ((tcp->fd = socket (PF_INET, SOCK_STREAM, 0)) == -1)
return errno;
}
if (flags & MU_STREAM_NONBLOCK)
{
flgs = fcntl (tcp->fd, F_GETFL);
flgs |= O_NONBLOCK;
fcntl (tcp->fd, F_SETFL, flgs);
mu_stream_set_flags (stream, MU_STREAM_NONBLOCK);
}
if (tcp->source_addr != INADDR_ANY)
{
struct sockaddr_in s;
s.sin_family = AF_INET;
s.sin_addr.s_addr = tcp->source_addr;
s.sin_port = 0;
if (bind (tcp->fd, (struct sockaddr*) &s, sizeof(s)) < 0)
{
int e = errno;
close (tcp->fd);
tcp->fd = -1;
return e;
}
}
tcp->state = TCP_STATE_RESOLVING;
case TCP_STATE_RESOLVING:
if (!(tcp->host != NULL && tcp->port > 0))
{
_tcp_close (stream);
return EINVAL;
}
if ((ret = resolve_hostname (tcp->host, &tcp->address)))
{
_tcp_close (stream);
return ret;
}
tcp->state = TCP_STATE_RESOLVE;
case TCP_STATE_RESOLVE:
memset (&soc_addr, 0, sizeof (soc_addr));
soc_addr.sin_family = AF_INET;
soc_addr.sin_port = htons (tcp->port);
soc_addr.sin_addr.s_addr = tcp->address;
if ((connect (tcp->fd,
(struct sockaddr *) &soc_addr, sizeof (soc_addr))) == -1)
{
ret = errno;
if (ret == EINPROGRESS || ret == EAGAIN)
{
tcp->state = TCP_STATE_CONNECTING;
ret = EAGAIN;
}
else
_tcp_close (stream);
return ret;
}
tcp->state = TCP_STATE_CONNECTING;
case TCP_STATE_CONNECTING:
namelen = sizeof (peer_addr);
if (getpeername (tcp->fd,
(struct sockaddr *) &peer_addr, &namelen) == 0)
tcp->state = TCP_STATE_CONNECTED;
else
{
ret = errno;
_tcp_close (stream);
return ret;
}
break;
}
return 0;
}
static int
_tcp_get_transport2 (mu_stream_t stream, mu_transport_t *tr,
mu_transport_t *tr2)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
if (tcp->fd == -1)
return EINVAL;
if (tr)
*tr = (mu_transport_t) tcp->fd;
if (tr2)
*tr2 = NULL;
return 0;
}
static int
_tcp_read (mu_stream_t stream, char *buf, size_t buf_size,
mu_off_t offset, size_t * br)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
int bytes;
offset = offset;
if (br == NULL)
return MU_ERR_OUT_NULL;
*br = 0;
if ((bytes = recv (tcp->fd, buf, buf_size, 0)) == -1)
{
*br = 0;
return errno;
}
*br = bytes;
return 0;
}
static int
_tcp_write (mu_stream_t stream, const char *buf, size_t buf_size,
mu_off_t offset,
size_t * bw)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
int bytes;
offset = offset;
if (bw == NULL)
return MU_ERR_OUT_NULL;
*bw = 0;
if ((bytes = send (tcp->fd, buf, buf_size, 0)) == -1)
{
*bw = 0;
return errno;
}
*bw = bytes;
return 0;
}
static void
_tcp_destroy (mu_stream_t stream)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
if (tcp->host)
free (tcp->host);
if (tcp->fd != -1)
close (tcp->fd);
free (tcp);
}
int
_tcp_wait (mu_stream_t stream, int *pflags, struct timeval *tvp)
{
struct _tcp_instance *tcp = mu_stream_get_owner (stream);
if (tcp->fd == -1)
return EINVAL;
return mu_fd_wait (tcp->fd, pflags, tvp);
}
int
mu_tcp_stream_create_with_source_ip (mu_stream_t *stream,
const char *host, int port,
unsigned long source_ip,
int flags)
{
struct _tcp_instance *tcp;
int ret;
if (host == NULL)
return MU_ERR_TCP_NO_HOST;
if (port < 1)
return MU_ERR_TCP_NO_PORT;
if ((tcp = malloc (sizeof (*tcp))) == NULL)
return ENOMEM;
tcp->fd = -1;
tcp->host = strdup (host);
if(!tcp->host)
{
free (tcp);
return ENOMEM;
}
tcp->port = port;
tcp->state = TCP_STATE_INIT;
tcp->source_addr = source_ip;
if ((ret = mu_stream_create (stream,
flags | MU_STREAM_NO_CHECK | MU_STREAM_RDWR, tcp)))
{
free (tcp->host);
free (tcp);
return ret;
}
mu_stream_set_open (*stream, _tcp_open, tcp);
mu_stream_set_close (*stream, _tcp_close, tcp);
mu_stream_set_read (*stream, _tcp_read, tcp);
mu_stream_set_write (*stream, _tcp_write, tcp);
mu_stream_set_get_transport2 (*stream, _tcp_get_transport2, tcp);
mu_stream_set_destroy (*stream, _tcp_destroy, tcp);
mu_stream_set_wait (*stream, _tcp_wait, tcp);
return 0;
}
int
mu_tcp_stream_create_with_source_host (mu_stream_t *stream,
const char *host, int port,
const char *source_host,
int flags)
{
unsigned long source_addr;
int ret = resolve_hostname (source_host, &source_addr);
if (ret == 0)
ret = mu_tcp_stream_create_with_source_ip (stream, host, port,
source_addr, flags);
return ret;
}
int
mu_tcp_stream_create (mu_stream_t *stream, const char *host, int port,
int flags)
{
return mu_tcp_stream_create_with_source_ip (stream, host, port,
INADDR_ANY, flags);
}
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