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/*
* Copyright (C) 1998 Michael R. Elkins <me@cs.hmc.edu>
* Copyright (C) 1999-2000 Brendan Cully <brendan@kublai.com>
* Copyright (C) 1999-2000 Tommi Komulainen <Tommi.Komulainen@iki.fi>
*
* 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, USA.
*/
#include "mutt.h"
#include "globals.h"
#include "mutt_socket.h"
#ifdef USE_SSL
# include "imap_ssl.h"
#endif
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
/* support for multiple socket connections */
static CONNECTION *Connections = NULL;
/* forward declarations */
static int socket_connect (CONNECTION* conn, struct sockaddr_in sin,
int verbose);
static CONNECTION* socket_new_conn ();
/* Wrappers */
int mutt_socket_open (CONNECTION* conn)
{
return conn->open (conn);
}
int mutt_socket_close (CONNECTION* conn)
{
int rc = -1;
if (conn->fd < 0)
dprint (1, (debugfile, "mutt_socket_close: Attempt to close closed connection.\n"));
else
rc = conn->close (conn);
conn->fd = -1;
return rc;
}
int mutt_socket_write_d (CONNECTION *conn, const char *buf, int dbg)
{
int rc;
dprint (dbg, (debugfile,"> %s", buf));
if (conn->fd < 0)
{
dprint (1, (debugfile, "mutt_socket_write: attempt to write to closed connection\n"));
return -1;
}
if ((rc = conn->write (conn, buf, mutt_strlen (buf))) < 0)
{
dprint (1, (debugfile, "mutt_socket_write: error writing, closing socket\n"));
mutt_socket_close (conn);
return -1;
}
return rc;
}
/* simple read buffering to speed things up. */
int mutt_socket_readchar (CONNECTION *conn, char *c)
{
if (conn->bufpos >= conn->available)
{
if (conn->fd >= 0)
conn->available = conn->read (conn);
else
{
dprint (1, (debugfile, "mutt_socket_readchar: attempt to read closed from connection.\n"));
return -1;
}
conn->bufpos = 0;
if (conn->available <= 0)
return conn->available; /* returns 0 for EOF or -1 for other error */
}
*c = conn->inbuf[conn->bufpos];
conn->bufpos++;
return 1;
}
int mutt_socket_readln_d (char* buf, size_t buflen, CONNECTION* conn, int dbg)
{
char ch;
int i;
for (i = 0; i < buflen-1; i++)
{
if (mutt_socket_readchar (conn, &ch) != 1)
{
buf[i] = '\0';
return -1;
}
if (ch == '\n')
break;
buf[i] = ch;
}
/* strip \r from \r\n termination */
if (i && buf[i-1] == '\r')
buf[--i] = '\0';
else
buf[i] = '\0';
dprint (dbg, (debugfile, "< %s\n", buf));
/* number of bytes read, not strlen */
return i + 1;
}
CONNECTION* mutt_socket_head (void)
{
return Connections;
}
/* mutt_socket_free: remove connection from connection list and free it */
void mutt_socket_free (CONNECTION* conn)
{
CONNECTION* iter;
CONNECTION* tmp;
iter = Connections;
/* head is special case, doesn't need prev updated */
if (iter == conn)
{
Connections = iter->next;
FREE (&iter);
return;
}
while (iter->next)
{
if (iter->next == conn)
{
tmp = iter->next;
iter->next = tmp->next;
FREE (&tmp);
return;
}
iter = iter->next;
}
}
/* mutt_conn_find: find a connection off the list of connections whose
* account matches account. If start is not null, only search for
* connections after the given connection (allows higher level socket code
* to make more fine-grained searches than account info - eg in IMAP we may
* wish to find a connection which is not in IMAP_SELECTED state) */
CONNECTION* mutt_conn_find (const CONNECTION* start, const ACCOUNT* account)
{
CONNECTION* conn;
conn = start ? start->next : Connections;
while (conn)
{
if (mutt_account_match (account, &(conn->account)))
return conn;
conn = conn->next;
}
conn = socket_new_conn ();
memcpy (&conn->account, account, sizeof (ACCOUNT));
conn->next = Connections;
Connections = conn;
#ifdef USE_SSL
if (account->flags & M_ACCT_SSL)
ssl_socket_setup (conn);
else
#endif
{
conn->read = raw_socket_read;
conn->write = raw_socket_write;
conn->open = raw_socket_open;
conn->close = raw_socket_close;
}
return conn;
}
/* socket_connect: attempt to bind a socket and connect to it */
static int socket_connect (CONNECTION* conn, struct sockaddr_in sin,
int verbose)
{
if ((conn->fd = socket (AF_INET, SOCK_STREAM, IPPROTO_IP)) < 0)
{
if (verbose)
mutt_perror ("socket");
return -1;
}
if (connect (conn->fd, (struct sockaddr *) &sin, sizeof (sin)) < 0)
{
raw_socket_close (conn);
if (verbose)
{
mutt_perror ("connect");
sleep (1);
}
return -1;
}
return 0;
}
/* socket_new_conn: allocate and initialise a new connection. */
static CONNECTION* socket_new_conn ()
{
CONNECTION* conn;
conn = (CONNECTION *) safe_calloc (1, sizeof (CONNECTION));
conn->fd = -1;
return conn;
}
int raw_socket_close (CONNECTION *conn)
{
int ret = close (conn->fd);
if (ret == 0) conn->fd = -1;
return ret;
}
int raw_socket_read (CONNECTION *conn)
{
return read (conn->fd, conn->inbuf, LONG_STRING);
}
int raw_socket_write (CONNECTION* conn, const char* buf, size_t count)
{
return write (conn->fd, buf, count);
}
int raw_socket_open (CONNECTION* conn)
{
struct sockaddr_in sin;
struct hostent *he;
int verbose;
int do_preconnect = mutt_strlen (Preconnect) > 0;
/* This might be a config variable */
int first_try_without_preconnect = TRUE;
mutt_message (_("Looking up %s..."), conn->account.host);
memset (&sin, 0, sizeof (sin));
sin.sin_port = htons (conn->account.port);
sin.sin_family = AF_INET;
if ((he = gethostbyname (conn->account.host)) == NULL)
{
mutt_error (_("Could not find the host \"%s\""), conn->account.host);
return -1;
}
memcpy (&sin.sin_addr, he->h_addr_list[0], he->h_length);
mutt_message (_("Connecting to %s..."), conn->account.host);
if (do_preconnect && first_try_without_preconnect)
{
verbose = FALSE;
if (socket_connect (conn, sin, verbose) == 0)
return 0;
}
if (do_preconnect)
{
int ret;
dprint (1, (debugfile, "Preconnect to server %s:\n", conn->account.host));
dprint (1, (debugfile, "\t%s
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