path: root/camel/providers/pop3/camel-pop3-store.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-pop3-store.c : class for a pop3 store */

/* 
 * Authors:
 *   Dan Winship <danw@helixcode.com>
 *
 * Copyright (C) 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 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 "camel-pop3-store.h"
#include "camel-pop3-folder.h"
#include "camel-stream-buffer.h"
#include "camel-stream-fs.h"
#include "camel-session.h"
#include "camel-exception.h"
#include "camel-url.h"
#include "md5-utils.h"

/* Specified in RFC 1939 */
#define POP3_PORT 110

#ifdef HAVE_KRB4
/* Specified nowhere */
#define KPOP_PORT 1109

#include <krb.h>
#endif

static CamelServiceClass *service_class = NULL;

static void finalize (GtkObject *object);

static gboolean pop3_connect (CamelService *service, CamelException *ex);
static gboolean pop3_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 char *get_root_folder_name (CamelStore *store, CamelException *ex);


static void
camel_pop3_store_class_init (CamelPop3StoreClass *camel_pop3_store_class)
{
    GtkObjectClass *object_class =
        GTK_OBJECT_CLASS (camel_pop3_store_class);
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_pop3_store_class);
    CamelStoreClass *camel_store_class =
        CAMEL_STORE_CLASS (camel_pop3_store_class);
    
    service_class = gtk_type_class (camel_service_get_type ());

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

    camel_service_class->connect = pop3_connect;
    camel_service_class->disconnect = pop3_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;
    camel_store_class->get_root_folder_name = get_root_folder_name;
}



static void
camel_pop3_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_pop3_store_get_type (void)
{
    static GtkType camel_pop3_store_type = 0;

    if (!camel_pop3_store_type) {
        GtkTypeInfo camel_pop3_store_info = 
        {
            "CamelPop3Store",
            sizeof (CamelPop3Store),
            sizeof (CamelPop3StoreClass),
            (GtkClassInitFunc) camel_pop3_store_class_init,
            (GtkObjectInitFunc) camel_pop3_store_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };

        camel_pop3_store_type = gtk_type_unique (CAMEL_STORE_TYPE, &camel_pop3_store_info);
    }

    return camel_pop3_store_type;
}

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

    camel_exception_init (&ex);
    pop3_disconnect (CAMEL_SERVICE (object), &ex);
    camel_exception_clear (&ex);
}


static CamelServiceAuthType password_authtype = {
    "Password",

    "This option will connect to the POP server using the APOP "
    "protocol if possible, or a plaintext password if not.",

    "",
    TRUE
};

#ifdef HAVE_KRB4
static CamelServiceAuthType kpop_authtype = {
    "Kerberos 4 (KPOP)",

    "This will connect to the POP server and use Kerberos 4 "
    "to authenticate to it.",

    "+KPOP",
    FALSE
};
#endif

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

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

    sin.sin_family = h->h_addrtype;
    if (service->url->port)
        sin.sin_port = htons (service->url->port);
    else
        sin.sin_port = htons (POP3_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) {
        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;
#ifdef HAVE_KRB4
    gboolean kpop = TRUE;
    int saved_port;
#endif

    if (service->url) {
        passwd = try_connect (service, ex);
        if (camel_exception_get_id (ex) != CAMEL_EXCEPTION_NONE)
            return NULL;
#ifdef HAVE_KRB4
        saved_port = service->url->port;
        service->url->port = KPOP_PORT;
        kpop = try_connect (service, ex);
        service->url->port = saved_port;
        if (camel_exception_get_id (ex) != CAMEL_EXCEPTION_NONE)
            return NULL;
#endif
    }

    if (passwd)
        ret = g_list_append (ret, &password_authtype);
#ifdef HAVE_KRB4
    if (kpop)
        ret = g_list_append (ret, &kpop_authtype);
#endif
    return ret;
}

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

/**
 * camel_pop3_store_open: Connect to the server if we are currently
 * disconnected.
 * @store: the store
 * @ex: a CamelException
 *
 * The POP protocol does not allow deleted messages to be expunged
 * except by closing the connection. Thus, camel_pop3_folder_{open,close}
 * sometimes need to connect to or disconnect from the server. This
 * routine reconnects to the server if we have disconnected.
 *
 **/
void
camel_pop3_store_open (CamelPop3Store *store, CamelException *ex)
{
    CamelService *service = CAMEL_SERVICE (store);

    if (!camel_service_is_connected (service))
        pop3_connect (service, ex);
}

/**
 * camel_pop3_store_close: Close the connection to the server and
 * possibly expunge deleted messages.
 * @store: the store
 * @expunge: whether or not to expunge deleted messages
 * @ex: a CamelException
 *
 * See camel_pop3_store_open for an explanation of why this is needed.
 *
 **/
void
camel_pop3_store_close (CamelPop3Store *store, gboolean expunge,
            CamelException *ex)
{
    if (expunge)
        camel_pop3_command (store, NULL, "QUIT");
    else
        camel_pop3_command (store, NULL, "RSET");
    pop3_disconnect (CAMEL_SERVICE (store), ex);
}

static gboolean
pop3_connect (CamelService *service, CamelException *ex)
{
    struct hostent *h;
    struct sockaddr_in sin;
    int fd, status;
    char *buf, *apoptime, *apopend, *msg;
    CamelPop3Store *store = CAMEL_POP3_STORE (service);
#ifdef HAVE_KRB4
    gboolean kpop = (service->url->authmech &&
             !strcmp (service->url->authmech, "+KPOP"));
#endif

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

    if (!service->url->authmech && !service->url->passwd) {
        char *prompt = g_strdup_printf ("Please enter the POP3 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 = service->url->port;
#ifdef HAVE_KRB4
    else if (kpop)
        sin.sin_port = KPOP_PORT;
#endif
    else
        sin.sin_port = POP3_PORT;
    sin.sin_port = htons (sin.sin_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;
    }

#ifdef HAVE_KRB4
    if (kpop) {
        KTEXT_ST ticket_st;
        MSG_DAT msg_data;
        CREDENTIALS cred;
        Key_schedule schedule;
        char *hostname;

        /* Need to copy hostname, because krb_realmofhost will
         * call gethostbyname as well, and gethostbyname uses
         * static storage.
         */
        hostname = g_strdup (h->h_name);
        status = krb_sendauth (0, fd, &ticket_st, "pop", hostname,
                       krb_realmofhost (hostname), 0,
                       &msg_data, &cred, schedule,
                       NULL, NULL, "KPOPV0.1");
        g_free (hostname);
        if (status != KSUCCESS) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                          "Could not authenticate to KPOP "
                          "server: %s",
                          krb_err_txt[status]);
            close (fd);
            return FALSE;
        }

        if (!service->url->passwd)
            service->url->passwd = g_strdup (service->url->user);
    }
#endif /* HAVE_KRB4 */

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

    /* Read the greeting, note APOP timestamp, if any. */
    buf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    if (!buf) {
        camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                     "Could not read greeting from POP "
                     "server.");
        return FALSE;
        camel_stream_close (store->ostream);
        camel_stream_close (store->istream);
    }
    apoptime = strchr (buf, '<');
    apopend = apoptime ? strchr (apoptime, '>') : NULL;
    if (apoptime && apopend)
        apoptime = g_strndup (apoptime, apopend - apoptime + 1);
    else
        apoptime = NULL;
    g_free (buf);

    /* Authenticate via APOP if we can, USER/PASS if we can't. */
    if (apoptime) {
        char *secret, md5asc[32], *d;
        unsigned char md5sum[16], *s;

        secret = g_strdup_printf ("%s%s", apoptime,
                      service->url->passwd);
        md5_get_digest (secret, strlen (secret), md5sum);
        g_free (apoptime);
        g_free (secret);

        for (s = md5sum, d = md5asc; d < md5asc + 32; s++, d += 2)
            sprintf (d, "%.2x", *s);

        status = camel_pop3_command (store, &msg, "APOP %s %s",
                         service->url->user, md5asc);
    } else {
        status = camel_pop3_command (store, &msg, "USER %s",
                         service->url->user);
        if (status != CAMEL_POP3_OK) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
                          "Unable to connect to POP "
                          "server. Error sending username:"
                          " %s", msg ? msg : "(Unknown)");
            g_free (msg);
            camel_stream_close (store->ostream);
            camel_stream_close (store->istream);
            return FALSE;
        }

        status = camel_pop3_command(store, &msg, "PASS %s",
                        service->url->passwd);
    }

    if (status != CAMEL_POP3_OK) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
                      "Unable to authenticate to POP "
                      "server. Error sending password:"
                      " %s", msg ? msg : "(Unknown)");
        g_free (msg);
        camel_stream_close (store->ostream);
        camel_stream_close (store->istream);
        return FALSE;
    }

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

static gboolean
pop3_disconnect (CamelService *service, CamelException *ex)
{
    CamelPop3Store *store = CAMEL_POP3_STORE (service);

    if (!service->connected)
        return TRUE;

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

    /* Closing the buffered write stream will close the
     * unbuffered read stream wrapped inside it as well.
     */
    camel_stream_close (store->ostream);
    gtk_object_unref (GTK_OBJECT (store->ostream));
    store->ostream = NULL;
    store->istream = NULL;
    return TRUE;
}

static CamelFolder *
get_folder (CamelStore *store, const char *folder_name, CamelException *ex)
{
    return camel_pop3_folder_new (store, ex);
}

static char *
get_folder_name (CamelStore *store, const char *folder_name,
         CamelException *ex)
{
    if (!g_strcasecmp (folder_name, "inbox"))
        return g_strdup ("inbox");
    else {
        camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INVALID,
                      "No such folder `%s'.", folder_name);
        return NULL;
    }
}

static char *
get_root_folder_name (CamelStore *store, CamelException *ex)
{
    return g_strdup ("inbox");
}


/**
 * camel_pop3_command: Send a command to a POP3 server.
 * @store: the POP3 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 POP3 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_pop3_command
 * will set it to point to an buffer containing the rest of the
 * response from the POP3 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_POP3_OK (command executed successfully),
 * CAMEL_POP3_ERR (command encounted an error), or CAMEL_POP3_FAIL
 * (a protocol-level error occurred, and Camel is uncertain of the
 * result of the command.)
 **/
int
camel_pop3_command (CamelPop3Store *store, char **ret, char *fmt, ...)
{
    char *cmdbuf, *respbuf;
    va_list ap;
    int status;

    va_start (ap, fmt);
    cmdbuf = g_strdup_vprintf (fmt, ap);
    va_end (ap);

    /* Send the command */
    camel_stream_write (store->ostream, cmdbuf, strlen (cmdbuf));
    g_free (cmdbuf);
    camel_stream_write (store->ostream, "\r\n", 2);

    /* Read the response */
    respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    if (!strncmp (respbuf, "+OK", 3))
        status = CAMEL_POP3_OK;
    else if (!strncmp (respbuf, "-ERR", 4))
        status = CAMEL_POP3_ERR;
    else
        status = CAMEL_POP3_FAIL;

    if (ret) {
        if (status != CAMEL_POP3_FAIL) {
            *ret = strchr (respbuf, ' ');
            if (*ret)
                *ret = g_strdup (*ret + 1);
        } else
            *ret = NULL;
    }
    g_free (respbuf);

    return status;
}

/**
 * camel_pop3_command_get_additional_data: get "additional data" from
 * a POP3 command.
 * @store: the POP3 store
 *
 * This command gets the additional data returned by "multi-line" POP
 * commands, such as LIST, RETR, TOP, and UIDL. This command _must_
 * be called after a successful (CAMEL_POP3_OK) call to
 * camel_pop3_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_pop3_command_get_additional_data (CamelPop3Store *store)
{
    CamelStreamBuffer *stream = CAMEL_STREAM_BUFFER (store->istream);
    GPtrArray *data;
    char *buf;
    int i, status = CAMEL_POP3_OK;

    data = g_ptr_array_new ();
    while (1) {
        buf = camel_stream_buffer_read_line (stream);
        if (!buf) {
            status = CAMEL_POP3_FAIL;
            break;
        }

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

    if (status == CAMEL_POP3_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;
}