path: root/camel/providers/imap/camel-imap-store.c

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

/*
 * Authors: Jeffrey Stedfast <fejj@helixcode.com>
 *          Ross Golder <ross@golder.org>
 *
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * 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
 */


#include <config.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-imap-store.h"
#include "camel-imap-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"

/* Specified in RFC 2060 */
#define IMAP_PORT 143

static CamelServiceClass *service_class = NULL;

static void finalize (GtkObject *object);

static gboolean imap_connect (CamelService *service, CamelException *ex);
static gboolean imap_disconnect (CamelService *service, CamelException *ex);
static GList *query_auth_types (CamelService *service, CamelException *ex);
static void free_auth_types (CamelService *service, GList *authtypes);

static CamelFolder *get_folder (CamelStore *store, const char *folder_name,
                CamelException *ex);
static char *get_folder_name (CamelStore *store, const char *folder_name,
                  CamelException *ex);

static void
camel_imap_store_class_init (CamelImapStoreClass *camel_imap_store_class)
{
    /* virtual method overload */
    GtkObjectClass *object_class =
        GTK_OBJECT_CLASS (camel_imap_store_class);
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_imap_store_class);
    CamelStoreClass *camel_store_class =
        CAMEL_STORE_CLASS (camel_imap_store_class);
    
    service_class = gtk_type_class (camel_service_get_type ());

    /* virtual method overload */
    object_class->finalize = finalize;

    camel_service_class->connect = imap_connect;
    camel_service_class->disconnect = imap_disconnect;
    camel_service_class->query_auth_types = query_auth_types;
    camel_service_class->free_auth_types = free_auth_types;

    camel_store_class->get_folder = get_folder;
    camel_store_class->get_folder_name = get_folder_name;
}


static void
camel_imap_store_init (gpointer object, gpointer klass)
{
    CamelService *service = CAMEL_SERVICE (object);
    CamelStore *store = CAMEL_STORE (object);

    service->url_flags = ( CAMEL_SERVICE_URL_NEED_USER |
                   CAMEL_SERVICE_URL_NEED_HOST );

    store->folders = g_hash_table_new (g_str_hash, g_str_equal);
}


GtkType
camel_imap_store_get_type (void)
{
    static GtkType camel_imap_store_type = 0;
    
    if (!camel_imap_store_type) {
        GtkTypeInfo camel_imap_store_info = 
        {
            "CamelImapStore",
            sizeof (CamelImapStore),
            sizeof (CamelImapStoreClass),
            (GtkClassInitFunc) camel_imap_store_class_init,
            (GtkObjectInitFunc) camel_imap_store_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_imap_store_type = gtk_type_unique (CAMEL_STORE_TYPE, &camel_imap_store_info);
    }
    
    return camel_imap_store_type;
}

static void
finalize (GtkObject *object)
{
    CamelException ex;

    camel_exception_init (&ex);
    imap_disconnect (CAMEL_SERVICE (object), &ex);
    camel_exception_clear (&ex);
}

static CamelServiceAuthType password_authtype = {
    "Password",

    "This option will connect to the IMAP server using a "
    "plaintext password.",

    "",
    TRUE
};

static gboolean
try_connect (CamelService *service, CamelException *ex)
{
    struct hostent *h;
    struct sockaddr_in sin;
    gint fd;

    h = camel_service_gethost (service, ex);
    if (!h)
        return FALSE;

    sin.sin_family = h->h_addrtype;
    sin.sin_port = htons (service->url->port ? service->url->port : IMAP_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) {

        /* We don't want to set a CamelException here */

        if (fd > -1)
            close (fd);

        return FALSE;
    }

    close (fd);
    return TRUE;
}

static GList *
query_auth_types (CamelService *service, CamelException *ex)
{
    GList *ret = NULL;
    gboolean passwd = TRUE;


    if (service->url) {
        passwd = try_connect (service, ex);
        if (camel_exception_get_id (ex) != CAMEL_EXCEPTION_NONE)
            return NULL;
    }

    if (passwd)
        ret = g_list_append (ret, &password_authtype);

    if (!ret) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      "Could not connect to IMAP server on "
                      "%s.", service->url->host);
    }                     

    return ret;
}

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

static gboolean
imap_connect (CamelService *service, CamelException *ex)
{
    struct hostent *h;
    struct sockaddr_in sin;
    gint fd, status;
    gchar *buf, *msg;
    CamelImapStore *store = CAMEL_IMAP_STORE (service);


    h = camel_service_gethost (service, ex);
    if (!h)
        return FALSE;

    if (!service->url->authmech && !service->url->passwd) {
        gchar *prompt = g_strdup_printf ("Please enter the IMAP password for %s@%s",
                        service->url->user, h->h_name);
        service->url->passwd =
            camel_session_query_authenticator (camel_service_get_session (service),
                               prompt, TRUE,
                               service, "password",
                               ex);
        g_free (prompt);
        if (!service->url->passwd)
            return FALSE;
    }

    sin.sin_family = h->h_addrtype;
    if (service->url->port)
        sin.sin_port = htons(service->url->port);
    else
        sin.sin_port = htons(IMAP_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 %s): %s",
                      service->url->host, service->url->port,
                      strerror(errno));
        if (fd > -1)
            close (fd);

        return FALSE;
    }


    store->ostream = camel_stream_fs_new_with_fd (fd);
    store->istream = camel_stream_buffer_new (store->ostream,
                          CAMEL_STREAM_BUFFER_READ);
    store->command = 0;

    /* Read the greeting, if any. */
    buf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    if (!buf) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      "Could not read greeting from IMAP "
                      "server: %s",
                      camel_exception_get_description (ex));
        gtk_object_unref (GTK_OBJECT (store->ostream));
        gtk_object_unref (GTK_OBJECT (store->istream));
        return FALSE;
    }
    g_free (buf);

    status = camel_imap_command (store, &msg, "LOGIN \"%s\" \"%s\"",
                     service->url->user,
                     service->url->passwd);

    if (status != CAMEL_IMAP_OK) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
                      "Unable to authenticate to IMAP "
                      "server. Error sending password:"
                      " %s", msg ? msg : "(Unknown)");
        g_free (msg);
        gtk_object_unref (GTK_OBJECT (store->ostream));
        gtk_object_unref (GTK_OBJECT (store->istream));
        return FALSE;
    }

    service_class->connect (service, ex);
    return TRUE;
}

static gboolean
imap_disconnect (CamelService *service, CamelException *ex)
{
    CamelImapStore *store = CAMEL_IMAP_STORE (service);

    if (!service->connected)
        return TRUE;

    if (!service_class->disconnect (service, ex))
        return FALSE;

    gtk_object_unref (GTK_OBJECT (store->ostream));
    gtk_object_unref (GTK_OBJECT (store->istream));
    store->ostream = NULL;
    store->istream = NULL;

    return TRUE;
}

const gchar *
camel_imap_store_get_toplevel_dir (CamelImapStore *store)
{
    CamelURL *url = CAMEL_SERVICE (store)->url;

    g_assert(url != NULL);
    return url->path;
}


static CamelFolder
*get_folder (CamelStore *store, const char *folder_name, CamelException *ex)
{
    CamelImapFolder *new_imap_folder;
    CamelFolder *new_folder;

    new_imap_folder =  gtk_type_new (CAMEL_IMAP_FOLDER_TYPE);
    new_folder = CAMEL_FOLDER (new_imap_folder);
    
    /* XXX We shouldn't be passing NULL here, but it's equivalent to
     * what was there before, and there's no
     * CamelImapFolder::get_subfolder yet anyway...
     */
    CF_CLASS (new_folder)->init (new_folder, store, NULL,
                     folder_name, '/', ex);
    
    return new_folder;
}

static gchar
*get_folder_name (CamelStore *store, const char *folder_name,
         CamelException *ex)
{
    return g_strdup (folder_name);
}

/**
 * camel_imap_command: Send a command to a IMAP server.
 * @store: the IMAP store
 * @ret: a pointer to return the full server response in
 * @fmt: a printf-style format string, followed by arguments
 *
 * This command sends the command specified by @fmt and the following
 * arguments to the connected IMAP store specified by @store. It then
 * reads the server's response and parses out the status code. If
 * the caller passed a non-NULL pointer for @ret, camel_imap_command
 * will set it to point to an buffer containing the rest of the
 * response from the IMAP server. (If @ret was passed but there was
 * no extended response, @ret will be set to NULL.) The caller must
 * free this buffer when it is done with it.
 *
 * Return value: one of CAMEL_IMAP_OK (command executed successfully),
 * CAMEL_IMAP_ERR (command encounted an error), or CAMEL_IMAP_FAIL
 * (a protocol-level error occurred, and Camel is uncertain of the
 * result of the command.)
 **/
int
camel_imap_command (CamelImapStore *store, char **ret, char *fmt, ...)
{
    gchar *cmdbuf, *respbuf;
    gchar *cmdid;
    va_list ap;
    gint status;

    /* create the command */
    cmdid = g_strdup_printf("A%.5d", store->command++);
    va_start (ap, fmt);
    cmdbuf = g_strdup_vprintf (fmt, ap);
    va_end (ap);

    fprintf(stderr, "sending : %s %s\r\n", cmdid, cmdbuf);

    if (camel_stream_printf (store->ostream, "%s %s\r\n", cmdid, cmdbuf) == -1) {
        g_free(cmdbuf);
        g_free(cmdid);
        if (*ret)
            *ret = g_strdup(strerror(errno));
        return CAMEL_IMAP_FAIL;
    }
    g_free(cmdbuf);
    g_free(cmdid);

    /* Read the response */
    respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    if (respbuf == NULL) {
        if (*ret)
            *ret = g_strdup(strerror(errno));
        return CAMEL_IMAP_FAIL;
    }

    fprintf(stderr, "received: %s\n", respbuf);

    if (!strncmp (respbuf + 11, "OK", 2))
        status = CAMEL_IMAP_OK;
    else if (!strncmp (respbuf + 11, "BAD", 3))
        status = CAMEL_IMAP_ERR;
    else
        status = CAMEL_IMAP_FAIL;

    if (ret) {
        if (status != CAMEL_IMAP_FAIL) {
            *ret = strchr (respbuf, ' ');
            if (*ret)
                *ret = g_strdup (*ret + 1);
        } else
            *ret = NULL;
    }
    g_free (respbuf);

    return status;
}

/**
 * camel_imap_command_get_additional_data: get "additional data" from
 * an IMAP command.
 * @store: the IMAP store
 *
 * This command gets the additional data returned by "multi-line" IMAP
 * commands, such as LIST, RETR, TOP, and UIDL. This command _must_
 * be called after a successful (CAMEL_IMAP_OK) call to
 * camel_imap_command for a command that has a multi-line response.
 * The returned data is un-byte-stuffed, and has lines termined by
 * newlines rather than CR/LF pairs.
 *
 * Return value: the data, which the caller must free.
 **/
char *
camel_imap_command_get_additional_data (CamelImapStore *store,
                    CamelException *ex)
{
    CamelStreamBuffer *stream = CAMEL_STREAM_BUFFER (store->istream);
    GPtrArray *data;
    char *buf;
    int i, status = CAMEL_IMAP_OK;

    data = g_ptr_array_new ();
    while (1) {
        buf = camel_stream_buffer_read_line (stream);
        if (!buf) {
            status = CAMEL_IMAP_FAIL;
            break;
        }

        if (!strcmp (buf, "."))
            break;
        if (*buf == '.')
            memmove (buf, buf + 1, strlen (buf));
        g_ptr_array_add (data, buf);
    }

    if (status == CAMEL_IMAP_OK) {
        /* Append an empty string to the end of the array
         * so when we g_strjoinv it, we get a "\n" after
         * the last real line.
         */
        g_ptr_array_add (data, "");
        g_ptr_array_add (data, NULL);
        buf = g_strjoinv ("\n", (char **)data->pdata);
    } else
        buf = NULL;

    for (i = 0; i < data->len - 2; i++)
        g_free (data->pdata[i]);
    g_ptr_array_free (data, TRUE);

    return buf;
}