path: root/camel/camel-remote-store.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-remote-store.c : class for an remote store */

/*
 *  Authors: Peter Williams <peterw@helixcode.com>
 *           based on camel-imap-provider.c
 *
 *  Copyright 2000 Helix Code, Inc. (www.helixcode.com)
 *
 *  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 Street #330, Boston, MA 02111-1307, USA.
 *
 */

#include <config.h>

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "camel-remote-store.h"
#include "camel-folder.h"
#include "camel-exception.h"
#include "camel-session.h"
#include "camel-stream.h"
#include "camel-stream-buffer.h"
#include "camel-stream-fs.h"
#include "camel-url.h"
#include "string-utils.h"

#include "camel-private.h"
#include "camel-operation.h"

#define d(x) x
#if d(!)0
extern gboolean camel_verbose_debug;
#endif

#define CSRVC(obj) (CAMEL_SERVICE_CLASS      (CAMEL_OBJECT_GET_CLASS (obj)))
#define CSTRC(obj) (CAMEL_STORE_CLASS        (CAMEL_OBJECT_GET_CLASS (obj)))
#define CRSC(obj)  (CAMEL_REMOTE_STORE_CLASS (CAMEL_OBJECT_GET_CLASS (obj)))

static CamelStoreClass *store_class = NULL;

static gboolean remote_connect         (CamelService *service, CamelException *ex);
static gboolean remote_disconnect      (CamelService *service, gboolean clean, CamelException *ex);
static GList   *remote_query_auth_types(CamelService *service, gboolean connect, CamelException *ex);
static void     remote_free_auth_types (CamelService *service, GList *authtypes);
static char    *remote_get_name        (CamelService *service, gboolean brief);
static gint     remote_send_string     (CamelRemoteStore *store, CamelException *ex, 
                    char *fmt, va_list ap);
static gint     remote_send_stream     (CamelRemoteStore *store, CamelStream *stream,
                    CamelException *ex);
static gint     remote_recv_line       (CamelRemoteStore *store, char **dest, 
                    CamelException *ex);

static void
camel_remote_store_class_init (CamelRemoteStoreClass *camel_remote_store_class)
{
    /* virtual method overload */
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_remote_store_class);
    
    store_class = CAMEL_STORE_CLASS (camel_type_get_global_classfuncs (camel_store_get_type ()));
    
    /* virtual method overload */
    camel_service_class->connect = remote_connect;
    camel_service_class->disconnect = remote_disconnect;
    camel_service_class->query_auth_types = remote_query_auth_types;
    camel_service_class->free_auth_types = remote_free_auth_types;
    camel_service_class->get_name = remote_get_name;
    
    camel_remote_store_class->send_string = remote_send_string;
    camel_remote_store_class->send_stream = remote_send_stream;
    camel_remote_store_class->recv_line = remote_recv_line;
    camel_remote_store_class->keepalive = NULL;
}

static void
camel_remote_store_init (CamelObject *object)
{
    CamelStore *store = CAMEL_STORE (object);
    CamelRemoteStore *remote_store = CAMEL_REMOTE_STORE (object);
    
    store->folders = g_hash_table_new (g_str_hash, g_str_equal);
    
    remote_store->istream = NULL;
    remote_store->ostream = NULL;
    remote_store->timeout_id = 0;

    remote_store->priv = g_malloc0(sizeof(*remote_store->priv));
#ifdef ENABLE_THREADS
    remote_store->priv->stream_lock = e_mutex_new(E_MUTEX_REC);
#endif
}

static void
camel_remote_store_finalise(CamelObject *object)
{
    CamelRemoteStore *remote_store = CAMEL_REMOTE_STORE (object);

#ifdef ENABLE_THREADS
    e_mutex_destroy(remote_store->priv->stream_lock);
#endif
    g_free(remote_store->priv);
}


CamelType
camel_remote_store_get_type (void)
{
    static CamelType camel_remote_store_type = CAMEL_INVALID_TYPE;
    
    if (camel_remote_store_type == CAMEL_INVALID_TYPE) {
        camel_remote_store_type =
            camel_type_register (CAMEL_STORE_TYPE, "CamelRemoteStore",
                         sizeof (CamelRemoteStore),
                         sizeof (CamelRemoteStoreClass),
                         (CamelObjectClassInitFunc) camel_remote_store_class_init,
                         NULL,
                         (CamelObjectInitFunc) camel_remote_store_init,
                         (CamelObjectFinalizeFunc) camel_remote_store_finalise);
    }
    
    return camel_remote_store_type;
}

/* Auth stuff */

/*
static CamelServiceAuthType password_authtype = {
    N_("SSH Tunneling"),
    
    N_("This option will connect to the server using a "
       "SSH tunnel."),
    
    "",
    TRUE
};
*/

static GList *
remote_query_auth_types (CamelService *service, gboolean connect, CamelException *ex)
{
    return NULL;
}

static void
remote_free_auth_types (CamelService *service, GList *authtypes)
{
    g_list_free (authtypes);
}

static char *
remote_get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup_printf (_("%s server %s"),
                    service->provider->name,
                    service->url->host);
    else {
        return g_strdup_printf (_("%s service for %s on %s"),
                    service->provider->name,
                    service->url->user,
                    service->url->host);
    }
}

static gboolean
timeout_cb (gpointer data)
{
    CamelRemoteStore *store = CAMEL_REMOTE_STORE(data);

    CRSC (data)->keepalive(store);

    return TRUE;
}

/* this is a 'cancellable' connect, cancellable from camel_operation_cancel etc */
/* returns -1 & errno == EINTR if the connection was cancelled */
static int socket_connect(struct hostent *h, int port)
{
    struct sockaddr_in sin;
    int fd;
    int ret;
    socklen_t len;
    struct timeval tv;
    int cancel_fd;

    /* see if we're cancelled yet */
    if (camel_operation_cancel_check(NULL)) {
        errno = EINTR;
        return -1;
    }

    /* setup connect, we do it using a nonblocking socket so we can poll it */
    sin.sin_port = htons(port);
    sin.sin_family = h->h_addrtype;
    memcpy (&sin.sin_addr, h->h_addr, sizeof (sin.sin_addr));

    fd = socket (h->h_addrtype, SOCK_STREAM, 0);

    cancel_fd = camel_operation_cancel_fd(NULL);
    if (cancel_fd == -1) {
        ret = connect(fd, (struct sockaddr *)&sin, sizeof (sin));
        if (ret == -1) {
            close(fd);
            return -1;
        }
        return fd;
    } else {
        fd_set rdset, wrset;
        int flags, fdmax;

        flags = fcntl(fd, F_GETFL);
        fcntl(fd, F_SETFL, flags | O_NONBLOCK);

        ret = connect(fd, (struct sockaddr *)&sin, sizeof (sin));
        if (ret == 0) {
            fcntl(fd, F_SETFL, flags);
            return fd;
        }

        if (errno != EINPROGRESS) {
            close(fd);
            return -1;
        }

        FD_ZERO(&rdset);
        FD_ZERO(&wrset);
        FD_SET(fd, &wrset);
        FD_SET(cancel_fd, &rdset);
        fdmax = MAX(fd, cancel_fd)+1;
        tv.tv_usec = 0;
        tv.tv_sec = 60*4;
        if (select(fdmax, &rdset, &wrset, 0, &tv) == 0) {
            close(fd);
            errno = ETIMEDOUT;
            return -1;
        }
        if (cancel_fd != -1 && FD_ISSET(cancel_fd, &rdset)) {
            close(fd);
            errno = EINTR;
            return -1;
        } else {
            len = sizeof(int);
            if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &len) == -1) {
                close(fd);
                return -1;
            }
            if (ret != 0) {
                close(fd);
                errno = ret;
                return -1;
            }
        }
        fcntl(fd, F_SETFL, flags);
    }

    return fd;
}

static gboolean
remote_connect (CamelService *service, CamelException *ex)
{
    CamelRemoteStore *store = CAMEL_REMOTE_STORE (service);
    struct hostent *h;
    struct sockaddr_in sin;
    gint fd;
    gint port;
    
    h = camel_service_gethost (service, ex);
    if (!h)
        return FALSE;
    
    /* connect to the server */
    sin.sin_family = h->h_addrtype;
    
    if (service->url->port)
        port = service->url->port;
    else
        port = store->default_port; 

#if 1
    fd = socket_connect(h, port);
    if (fd == -1) {
        if (errno == EINTR)
            camel_exception_set(ex, CAMEL_EXCEPTION_USER_CANCEL, _("Connection cancelled"));
        else
            camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                          _("Could not connect to %s (port %d): %s"),
                          service->url->host ? service->url->host : _("(unknown host)"),
                          port, strerror (errno));
        return FALSE;
    }
#else
    sin.sin_port = htons (port);
    
    memcpy (&sin.sin_addr, h->h_addr, sizeof (sin.sin_addr));
    
    fd = socket (h->h_addrtype, SOCK_STREAM, 0);
    if (fd == -1 || connect (fd, (struct sockaddr *)&sin, sizeof (sin)) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      _("Could not connect to %s (port %d): %s"),
                      service->url->host ? service->url->host : _("(unknown host)"),
                      port, g_strerror (errno));
        if (fd > -1)
            close (fd);
        
        return FALSE;
    }
#endif
    
    /* parent class connect initialization */
    if (CAMEL_SERVICE_CLASS (store_class)->connect (service, ex) == FALSE)
        return FALSE;
    
    store->ostream = camel_stream_fs_new_with_fd (fd);
    store->istream = camel_stream_buffer_new (store->ostream, CAMEL_STREAM_BUFFER_READ);
    
    /* Okay, good enough for us */
    CAMEL_SERVICE (store)->connected = TRUE;
    
    /* Add a timeout so that we can hopefully prevent getting disconnected */
    /* (Only if the implementation supports it) */
    if (CRSC (store)->keepalive) {
        CamelSession *session = camel_service_get_session (CAMEL_SERVICE (store));
        
        store->timeout_id = camel_session_register_timeout (session, 10 * 60 * 1000, 
                                    timeout_cb, 
                                    store);
    }
    
    return TRUE;
}

static gboolean
remote_disconnect (CamelService *service, gboolean clean, CamelException *ex)
{
    CamelRemoteStore *store = CAMEL_REMOTE_STORE (service);
    
    if (store->timeout_id) {
        camel_session_remove_timeout (camel_service_get_session (CAMEL_SERVICE (store)),
                          store->timeout_id);
        store->timeout_id = 0;
    }
    
    if (!CAMEL_SERVICE_CLASS (store_class)->disconnect (service, clean, ex))
        return FALSE;
    
    if (store->istream) {
        camel_object_unref (CAMEL_OBJECT (store->istream));
        store->istream = NULL;
    }
    
    if (store->ostream) {
        camel_object_unref (CAMEL_OBJECT (store->ostream));
        store->ostream = NULL;
    }
    
    return TRUE;
}

static gint
remote_send_string (CamelRemoteStore *store, CamelException *ex, char *fmt, va_list ap)
{
    gchar *cmdbuf;
    
    /* Check for connectedness. Failed (or cancelled) operations will
     * close the connection. */
    if (!camel_remote_store_connected (store, ex))
        return -1;
    
    /* create the command */
    cmdbuf = g_strdup_vprintf (fmt, ap);

#if d(!)0
    if (camel_verbose_debug) {
        if (strncmp (cmdbuf, "PASS ", 5) == 0)
            fprintf (stderr, "sending : PASS xxxx\n");
        else if (strstr (cmdbuf, "LOGIN \""))
            fprintf (stderr, "sending : ---- LOGIN \"xxxx\" \"xxxx\"\n");
        else
            fprintf (stderr, "sending : %s", cmdbuf);
    }
#endif
    
    if (camel_stream_printf (store->ostream, "%s", cmdbuf) == -1) {
        if (errno == EINTR)
            camel_exception_set(ex, CAMEL_EXCEPTION_USER_CANCEL, _("Operation cancelled"));
        else
            camel_exception_set(ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE, strerror(errno));
        g_free (cmdbuf);
        
        camel_service_disconnect (CAMEL_SERVICE (store), FALSE, NULL);
        return -1;
    }
    g_free (cmdbuf);
    
    return 0;
}

/* FIXME: All of these functions need an api overhaul, they're not like
   any other functions, anywhere in the world ... */

/**
 * camel_remote_store_send_string: Writes a string to the server
 * @store: a CamelRemoteStore
 * @ex: a CamelException
 * @fmt: the printf-style format to use for creating the string to send
 * @...: the arguments to the printf string @fmt
 * Return value: 0 on success, nonzero on error
 *
 * Formats the string and sends it to the server.
 **/

gint 
camel_remote_store_send_string (CamelRemoteStore *store, CamelException *ex,
                char *fmt, ...)
{
    va_list ap;
    gint ret;
    
    g_return_val_if_fail (CAMEL_IS_REMOTE_STORE (store), -1);
    g_return_val_if_fail (fmt, -1);
    
    va_start (ap, fmt);
    CAMEL_REMOTE_STORE_LOCK(store, stream_lock);
    ret = CRSC (store)->send_string (store, ex, fmt, ap);
    CAMEL_REMOTE_STORE_UNLOCK(store, stream_lock);
    va_end (ap);
    
    return ret;
}

static gint
remote_send_stream (CamelRemoteStore *store, CamelStream *stream, CamelException *ex)
{
    int ret;

    /* Check for connectedness. Failed (or cancelled) operations will
     * close the connection. */

    if (!camel_remote_store_connected (store, ex))
        return -1;
    
    d(fprintf (stderr, "(sending stream)\n"));
    
    ret = camel_stream_write_to_stream (stream, store->ostream);
    if (ret == -1) {
        if (errno == EINTR)
            camel_exception_set(ex, CAMEL_EXCEPTION_USER_CANCEL, _("Operation cancelled"));
        else
            camel_exception_set(ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE, strerror(errno));
        
        camel_service_disconnect (CAMEL_SERVICE (store), FALSE, NULL);
    }

    return ret;
}

/**
 * camel_remote_store_send_stream: Writes a CamelStream to the server
 * @store: a CamelRemoteStore
 * @stream: the stream to write
 * @ex: a CamelException
 * Return value: 0 on success, nonzero on error
 *
 * Sends the stream to the server.
 **/

gint 
camel_remote_store_send_stream (CamelRemoteStore *store, CamelStream *stream, CamelException *ex)
{
    int ret;

    g_return_val_if_fail (CAMEL_IS_REMOTE_STORE (store), -1);
    g_return_val_if_fail (CAMEL_IS_STREAM (stream), -1);

    CAMEL_REMOTE_STORE_LOCK(store, stream_lock);
    
    ret = CRSC (store)->send_stream (store, stream, ex);

    CAMEL_REMOTE_STORE_UNLOCK(store, stream_lock);

    return ret;
}

static int
remote_recv_line (CamelRemoteStore *store, char **dest, CamelException *ex)
{
    CamelStreamBuffer *stream = CAMEL_STREAM_BUFFER (store->istream);
    GByteArray *bytes;
    gchar buf[1024], *ret;
    gint nread;
    
    *dest = NULL;
    
    /* Check for connectedness. Failed (or cancelled) operations will
     * close the connection. We can't expect a read to have any
     * meaning if we reconnect, so always set an exception.
     */
    
    if (!camel_remote_store_connected (store, ex)) {
        camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_NOT_CONNECTED,
                     g_strerror (errno));
        return -1;
    }

    bytes = g_byte_array_new ();
    
    do {
        nread = camel_stream_buffer_gets (stream, buf, sizeof (buf));
        if (nread > 0)
            g_byte_array_append (bytes, buf, nread);
    } while (nread == sizeof (buf) - 1);

    if (nread == -1) {
        if (errno == EINTR)
            camel_exception_set(ex, CAMEL_EXCEPTION_USER_CANCEL, _("Operation cancelled"));
        else
            camel_exception_set(ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE, strerror(errno));
    } else if (bytes->len == 0) {
        camel_exception_set(ex, CAMEL_EXCEPTION_SERVICE_NOT_CONNECTED,
                    _("Server unexpectedly disconnected"));
    }
    if (camel_exception_is_set (ex)) {
        g_byte_array_free(bytes, TRUE);
        camel_service_disconnect (CAMEL_SERVICE (store), FALSE, NULL);
        return -1;
    }

    g_byte_array_append (bytes, "", 1);
    ret = bytes->data;
    nread = bytes->len - 1;
    g_byte_array_free (bytes, FALSE);
    
    /* strip off the CRLF sequence */
    while (nread > 0 && ret[nread] != '\r')
        ret[nread--] = '\0';
    ret[nread] = '\0';
    
    *dest = ret;
    
#if d(!)0
    if (camel_verbose_debug)
        fprintf (stderr, "received: %s\n", *dest);
#endif
    
    return nread;
}

/**
 * camel_remote_store_recv_line: Reads a line from the server
 * @store: a CamelRemoteStore
 * @dest: a pointer that will be set to the location of a buffer
 *        holding the server's response
 * @ex: a CamelException
 * Return value: -1 on error, otherwise the length read.
 *
 * Reads a line from the server (terminated by \n or \r\n).
 **/

gint 
camel_remote_store_recv_line (CamelRemoteStore *store, char **dest,
                  CamelException *ex)
{
    int ret;

    g_return_val_if_fail (CAMEL_IS_REMOTE_STORE (store), -1);
    g_return_val_if_fail (dest, -1);

    CAMEL_REMOTE_STORE_LOCK(store, stream_lock);
    
    ret = CRSC (store)->recv_line (store, dest, ex);

    CAMEL_REMOTE_STORE_UNLOCK(store, stream_lock);

    return ret;
}

static void
refresh_folder_info (gpointer key, gpointer value, gpointer data)
{
    CamelFolder *folder = CAMEL_FOLDER (value);
    
    camel_folder_refresh_info (folder, (CamelException *) data);
}

/**
 * camel_remote_store_refresh_folders: Refresh the folders that I
 * contain
 * @store: a CamelRemoteStore
 * @ex: a CamelException
 *
 * Refreshes the folders listed in the folders hashtable.
 **/
void
camel_remote_store_refresh_folders (CamelRemoteStore *store, CamelException *ex)
{
    CAMEL_STORE_LOCK(store, cache_lock);

    g_hash_table_foreach (CAMEL_STORE (store)->folders, refresh_folder_info, ex);

    CAMEL_STORE_UNLOCK(store, cache_lock);
}   

/**
 * camel_remote_store_connected:
 * @store: a CamelRemoteStore
 * @ex: a CamelException
 *
 * Ensure that the remote store is connected.
 *
 * Return value: Whether or not it is connected
 **/
gboolean
camel_remote_store_connected (CamelRemoteStore *store, CamelException *ex)
{
    if (store->istream == NULL)
        return camel_service_connect (CAMEL_SERVICE (store), ex);
    return TRUE;
}