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/* $Id: pop3.c,v 1.31 2011/06/07 22:18:52 khorben Exp $ */
/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Desktop Mailer */
/* 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, version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>. */
/* FIXME:
* - really queue commands with callbacks
* - support multiple connections? */
#include <sys/socket.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <glib.h>
#include <System.h>
#include "Mailer.h"
/* POP3 */
/* private */
/* types */
struct _AccountFolder
{
Folder * folder;
AccountMessage ** messages;
size_t messages_cnt;
};
struct _AccountMessage
{
Message * message;
unsigned int id;
};
typedef enum _POP3CommandStatus
{
P3CS_QUEUED = 0,
P3CS_SENT,
P3CS_ERROR,
P3CS_PARSING,
P3CS_OK
} POP3CommandStatus;
typedef enum _POP3Context
{
P3C_INIT = 0,
P3C_AUTHORIZATION_USER,
P3C_AUTHORIZATION_PASS,
P3C_NOOP,
P3C_TRANSACTION_LIST,
P3C_TRANSACTION_RETR,
P3C_TRANSACTION_STAT,
P3C_TRANSACTION_TOP
} POP3Context;
typedef struct _POP3Command
{
POP3CommandStatus status;
POP3Context context;
char * buf;
size_t buf_cnt;
union
{
struct
{
unsigned int id;
gboolean body;
AccountMessage * message;
} transaction_retr, transaction_top;
} data;
} POP3Command;
typedef struct _POP3
{
int fd;
guint source;
AccountFolder inbox;
AccountFolder trash;
GIOChannel * channel;
char * rd_buf;
size_t rd_buf_cnt;
guint rd_source;
guint wr_source;
POP3Command * queue;
size_t queue_cnt;
} POP3;
/* variables */
static char const _pop3_type[] = "POP3";
static char const _pop3_name[] = "POP3 server";
static AccountConfig _pop3_config[] =
{
{ "username", "Username", ACT_STRING, NULL },
{ "password", "Password", ACT_PASSWORD, NULL },
{ "hostname", "Server hostname", ACT_STRING, NULL },
{ "port", "Server port", ACT_UINT16, NULL },
#if 0 /* FIXME SSL is not supported yet */
{ "ssl", "Use SSL", ACT_BOOLEAN, NULL },
#endif
{ "delete", "Delete read mails on server",
ACT_BOOLEAN, NULL },
{ NULL, NULL, ACT_NONE, NULL }
};
/* prototypes */
/* plug-in */
static int _pop3_init(AccountPlugin * plugin);
static int _pop3_destroy(AccountPlugin * plugin);
static int _pop3_refresh(AccountPlugin * plugin, AccountFolder * folder,
AccountMessage * message);
/* useful */
static POP3Command * _pop3_command(AccountPlugin * plugin, POP3Context context,
char const * command);
static int _pop3_parse(AccountPlugin * plugin);
static AccountMessage * _pop3_message_get(AccountPlugin * plugin,
AccountFolder * folder, unsigned int id);
static AccountMessage * _pop3_message_new(AccountPlugin * plugin,
AccountFolder * folder, unsigned int id);
static void _pop3_message_delete(AccountPlugin * plugin,
AccountMessage * message);
/* callbacks */
static gboolean _on_connect(gpointer data);
static gboolean _on_noop(gpointer data);
static gboolean _on_reset(gpointer data);
static gboolean _on_watch_can_connect(GIOChannel * source,
GIOCondition condition, gpointer data);
static gboolean _on_watch_can_read(GIOChannel * source, GIOCondition condition,
gpointer data);
static gboolean _on_watch_can_write(GIOChannel * source, GIOCondition condition,
gpointer data);
/* public */
/* variables */
AccountPlugin account_plugin =
{
NULL,
_pop3_type,
_pop3_name,
NULL,
_pop3_config,
_pop3_init,
_pop3_destroy,
NULL,
_pop3_refresh,
NULL
};
/* private */
/* functions */
/* pop3_init */
static int _pop3_init(AccountPlugin * plugin)
{
POP3 * pop3;
if((pop3 = malloc(sizeof(*pop3))) == NULL)
return -1;
memset(pop3, 0, sizeof(*pop3));
plugin->priv = pop3;
pop3->fd = -1;
pop3->inbox.folder = plugin->helper->folder_new(plugin->helper->account,
&pop3->inbox, NULL, FT_INBOX, "Inbox");
pop3->trash.folder = plugin->helper->folder_new(plugin->helper->account,
&pop3->trash, NULL, FT_TRASH, "Trash");
pop3->source = g_idle_add(_on_connect, plugin);
return 0;
}
/* pop3_destroy */
static int _pop3_destroy(AccountPlugin * plugin)
{
POP3 * pop3 = plugin->priv;
size_t i;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
if(pop3 == NULL) /* XXX _pop3_destroy() may be called uninitialized */
return 0;
if(pop3->rd_source != 0)
g_source_remove(pop3->rd_source);
free(pop3->rd_buf);
if(pop3->wr_source != 0)
g_source_remove(pop3->wr_source);
if(pop3->source != 0)
g_source_remove(pop3->source);
if(pop3->channel != NULL)
{
g_io_channel_shutdown(pop3->channel, TRUE, NULL);
g_io_channel_unref(pop3->channel);
pop3->fd = -1;
}
for(i = 0; i < pop3->queue_cnt; i++)
free(pop3->queue[i].buf);
free(pop3->queue);
if(pop3->fd >= 0)
close(pop3->fd);
free(pop3);
return 0;
}
/* pop3_refresh */
static int _pop3_refresh(AccountPlugin * plugin, AccountFolder * folder,
AccountMessage * message)
{
char buf[32];
POP3Command * cmd;
snprintf(buf, sizeof(buf), "%s %u", "RETR", message->id);
if((cmd = _pop3_command(plugin, P3C_TRANSACTION_RETR, buf)) == NULL)
return -1;
cmd->data.transaction_retr.id = message->id;
return 0;
}
/* useful */
/* pop3_command */
static POP3Command * _pop3_command(AccountPlugin * plugin, POP3Context context,
char const * command)
{
POP3 * pop3 = plugin->priv;
POP3Command * p;
size_t len;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s(\"%s\") %p\n", __func__, command,
(void *)pop3->channel);
#endif
/* abort if the command is invalid */
if(command == NULL || (len = strlen(command)) == 0)
return NULL;
/* abort if there is no active connection */
if(pop3->channel == NULL)
return NULL;
/* queue the command */
len += 2;
if((p = realloc(pop3->queue, sizeof(*p) * (pop3->queue_cnt + 1)))
== NULL)
return NULL;
pop3->queue = p;
p = &pop3->queue[pop3->queue_cnt];
p->context = context;
p->status = P3CS_QUEUED;
if((p->buf = malloc(len + 1)) == NULL)
return NULL;
p->buf_cnt = snprintf(p->buf, len + 1, "%s\r\n", command);
memset(&p->data, 0, sizeof(p->data));
if(pop3->queue_cnt++ == 0)
{
if(pop3->source != 0)
{
/* cancel the pending NOOP operation */
g_source_remove(pop3->source);
pop3->source = 0;
}
pop3->wr_source = g_io_add_watch(pop3->channel, G_IO_OUT,
_on_watch_can_write, plugin);
}
return p;
}
/* pop3_parse */
static int _parse_context(AccountPlugin * plugin, char const * answer);
static int _parse_context_transaction_retr(AccountPlugin * plugin,
char const * answer);
static int _pop3_parse(AccountPlugin * plugin)
{
int ret = 0;
AccountPluginHelper * helper = plugin->helper;
POP3 * pop3 = plugin->priv;
size_t i;
size_t j;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
for(i = 0, j = 0;; j = ++i)
{
for(; i < pop3->rd_buf_cnt; i++)
if(pop3->rd_buf[i] == '\r' && i + 1 < pop3->rd_buf_cnt
&& pop3->rd_buf[++i] == '\n')
break;
if(i == pop3->rd_buf_cnt)
break;
if(pop3->queue_cnt == 0)
continue;
pop3->rd_buf[i - 1] = '\0';
if(pop3->queue[0].status == P3CS_SENT
&& strncmp("-ERR", &pop3->rd_buf[j], 4) == 0)
{
pop3->queue[0].status = P3CS_ERROR;
helper->error(helper->account, &pop3->rd_buf[j + 4], 1);
}
else if(pop3->queue[0].status == P3CS_SENT
&& strncmp("+OK", &pop3->rd_buf[j], 3) == 0)
pop3->queue[0].status = P3CS_PARSING;
if(_parse_context(plugin, &pop3->rd_buf[j]) != 0)
{
pop3->queue[0].status = P3CS_ERROR;
ret = -1;
}
}
if(j != 0)
{
pop3->rd_buf_cnt -= j;
memmove(pop3->rd_buf, &pop3->rd_buf[j], pop3->rd_buf_cnt);
}
return ret;
}
static int _parse_context(AccountPlugin * plugin, char const * answer)
{
int ret = -1;
POP3 * pop3 = plugin->priv;
POP3Command * cmd = &pop3->queue[0];
char const * p;
char * q;
unsigned int u;
unsigned int v;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s(\"%s\") %u, %u\n", __func__, answer,
pop3->queue[0].context, pop3->queue[0].status);
#endif
switch(cmd->context)
{
case P3C_INIT:
if(cmd->status != P3CS_PARSING)
return 0;
cmd->status = P3CS_OK;
if((p = plugin->config[0].value) == NULL)
return -1;
q = g_strdup_printf("%s %s", "USER", p);
cmd = _pop3_command(plugin, P3C_AUTHORIZATION_USER, q);
g_free(q);
return (cmd != NULL) ? 0 : -1;
case P3C_AUTHORIZATION_USER:
if(cmd->status != P3CS_PARSING)
return 0;
cmd->status = P3CS_OK;
if((p = plugin->config[1].value) == NULL)
p = ""; /* assumes an empty password */
q = g_strdup_printf("%s %s", "PASS", p);
cmd = _pop3_command(plugin, P3C_AUTHORIZATION_PASS, q);
g_free(q);
return (cmd != NULL) ? 0 : -1;
case P3C_AUTHORIZATION_PASS:
if(cmd->status != P3CS_PARSING)
return 0;
cmd->status = P3CS_OK;
return (_pop3_command(plugin, P3C_TRANSACTION_STAT,
"STAT") != NULL) ? 0 : -1;
case P3C_NOOP:
if(strncmp(answer, "+OK", 3) == 0)
cmd->status = P3CS_OK;
return 0;
case P3C_TRANSACTION_LIST:
if(cmd->status != P3CS_PARSING)
return 0;
if(strncmp(answer, "+OK", 3) == 0)
return 0;
if(strcmp(answer, ".") == 0)
{
cmd->status = P3CS_OK;
return 0;
}
if(sscanf(answer, "%u %u", &u, &v) != 2)
return -1;
/* FIXME may not be supported by the server */
q = g_strdup_printf("%s %u 0", "TOP", u);
cmd = _pop3_command(plugin, P3C_TRANSACTION_TOP, q);
free(q);
cmd->data.transaction_top.id = u;
return (cmd != NULL) ? 0 : -1;
case P3C_TRANSACTION_RETR:
case P3C_TRANSACTION_TOP: /* same as RETR without the body */
return _parse_context_transaction_retr(plugin, answer);
case P3C_TRANSACTION_STAT:
if(cmd->status != P3CS_PARSING)
return 0;
if(sscanf(answer, "+OK %u %u", &u, &v) != 2)
return -1;
cmd->status = P3CS_OK;
return (_pop3_command(plugin, P3C_TRANSACTION_LIST,
"LIST") != NULL) ? 0 : -1;
}
return ret;
}
static int _parse_context_transaction_retr(AccountPlugin * plugin,
char const * answer)
{
AccountPluginHelper * helper = plugin->helper;
POP3 * pop3 = plugin->priv;
POP3Command * cmd = &pop3->queue[0];
AccountMessage * message;
if(cmd->status != P3CS_PARSING)
return 0;
if((message = cmd->data.transaction_retr.message) == NULL
&& strncmp(answer, "+OK", 3) == 0)
{
cmd->data.transaction_retr.body = FALSE;
message = _pop3_message_get(plugin, &pop3->inbox,
cmd->data.transaction_retr.id);
cmd->data.transaction_retr.message = message;
return 0;
}
if(strcmp(answer, ".") == 0)
{
cmd->status = P3CS_OK;
return 0;
}
if(answer[0] == '\0')
{
cmd->data.transaction_retr.body = TRUE;
helper->message_set_body(message->message, NULL, 0, 0);
return 0;
}
if(cmd->data.transaction_retr.body)
{
helper->message_set_body(message->message, answer,
strlen(answer), 1);
helper->message_set_body(message->message, "\r\n", 2, 1);
}
else
helper->message_set_header(message->message, answer);
return 0;
}
/* pop3_message_get */
static AccountMessage * _pop3_message_get(AccountPlugin * plugin,
AccountFolder * folder, unsigned int id)
{
size_t i;
for(i = 0; i < folder->messages_cnt; i++)
if(folder->messages[i]->id == id)
return folder->messages[i];
return _pop3_message_new(plugin, folder, id);
}
/* pop3_message_new */
static AccountMessage * _pop3_message_new(AccountPlugin * plugin,
AccountFolder * folder, unsigned int id)
{
AccountPluginHelper * helper = plugin->helper;
AccountMessage * message;
AccountMessage ** p;
if((p = realloc(folder->messages, sizeof(*p)
* (folder->messages_cnt + 1))) == NULL)
return NULL;
folder->messages = p;
if((message = object_new(sizeof(*message))) == NULL)
return NULL;
message->id = id;
if((message->message = helper->message_new(helper->account,
folder->folder, message)) == NULL)
{
_pop3_message_delete(plugin, message);
return NULL;
}
folder->messages[folder->messages_cnt++] = message;
return message;
}
/* pop3_message_delete */
static void _pop3_message_delete(AccountPlugin * plugin,
AccountMessage * message)
{
if(message->message != NULL)
plugin->helper->message_delete(message->message);
object_delete(message);
}
/* callbacks */
/* on_idle */
static gboolean _connect_channel(AccountPlugin * plugin, gboolean connected);
static gboolean _on_connect(gpointer data)
{
AccountPlugin * plugin = data;
AccountPluginHelper * helper = plugin->helper;
POP3 * pop3 = plugin->priv;
char const * hostname;
char const * p;
struct hostent * he;
unsigned short port;
struct sockaddr_in sa;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
pop3->source = 0;
/* FIXME report errors */
if((hostname = plugin->config[2].value) == NULL)
return FALSE;
if((he = gethostbyname(hostname)) == NULL)
{
helper->error(NULL, hstrerror(h_errno), 1);
return FALSE;
}
if((p = plugin->config[3].value) == NULL)
return FALSE;
port = (unsigned long)p;
if((pop3->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
helper->error(NULL, strerror(errno), 1);
return FALSE;
}
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr.s_addr = *((uint32_t*)he->h_addr_list[0]);
helper->status(helper->account, "Connecting to %s (%s:%u)", hostname,
inet_ntoa(sa.sin_addr), port);
if(fcntl(pop3->fd, F_SETFL, O_NONBLOCK) != 0)
helper->error(NULL, strerror(errno), 1);
if(connect(pop3->fd, (struct sockaddr *)&sa, sizeof(sa)) != 0)
{
if(errno != EINPROGRESS)
{
helper->error(NULL, strerror(errno), 1);
close(pop3->fd);
pop3->fd = -1;
return FALSE;
}
else
return _connect_channel(plugin, FALSE);
}
return _connect_channel(plugin, TRUE);
}
static gboolean _connect_channel(AccountPlugin * plugin, gboolean connected)
{
POP3 * pop3 = plugin->priv;
GError * error = NULL;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
/* prepare queue */
if((pop3->queue = malloc(sizeof(*pop3->queue))) == NULL)
return FALSE;
pop3->queue[0].context = P3C_INIT;
pop3->queue[0].status = P3CS_SENT;
pop3->queue[0].buf = NULL;
pop3->queue[0].buf_cnt = 0;
pop3->queue_cnt = 1;
/* setup channel */
pop3->channel = g_io_channel_unix_new(pop3->fd);
g_io_channel_set_encoding(pop3->channel, NULL, &error);
g_io_channel_set_buffered(pop3->channel, FALSE);
if(connected)
/* wait for the server's banner */
pop3->rd_source = g_io_add_watch(pop3->channel, G_IO_IN,
_on_watch_can_read, plugin);
else
pop3->rd_source = g_io_add_watch(pop3->channel, G_IO_OUT,
_on_watch_can_connect, plugin);
return FALSE;
}
/* on_noop */
static gboolean _on_noop(gpointer data)
{
AccountPlugin * plugin = data;
POP3 * pop3 = plugin->priv;
_pop3_command(plugin, P3C_NOOP, "NOOP");
pop3->source = 0;
return FALSE;
}
/* on_reset */
static gboolean _on_reset(gpointer data)
{
AccountPlugin * plugin = data;
POP3 * pop3 = plugin->priv;
size_t i;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
/* FIXME merge with _pop3_destroy() */
if(pop3->rd_source != 0)
g_source_remove(pop3->rd_source);
pop3->rd_source = 0;
if(pop3->wr_source != 0)
g_source_remove(pop3->wr_source);
pop3->wr_source = 0;
if(pop3->source != 0)
g_source_remove(pop3->source);
pop3->source = 0;
if(pop3->channel != NULL)
{
g_io_channel_shutdown(pop3->channel, TRUE, NULL);
g_io_channel_unref(pop3->channel);
pop3->fd = -1;
}
pop3->channel = NULL;
for(i = 0; i < pop3->queue_cnt; i++)
free(pop3->queue[i].buf);
free(pop3->queue);
pop3->queue = NULL;
pop3->queue_cnt = 0;
if(pop3->fd >= 0)
close(pop3->fd);
pop3->fd = -1;
pop3->source = g_timeout_add(3000, _on_connect, plugin);
return FALSE;
}
/* on_watch_can_connect */
static gboolean _on_watch_can_connect(GIOChannel * source,
GIOCondition condition, gpointer data)
{
AccountPlugin * plugin = data;
POP3 * pop3 = plugin->priv;
if(condition != G_IO_OUT || source != pop3->channel)
return FALSE; /* should not happen */
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s() connected\n", __func__);
#endif
pop3->wr_source = 0;
/* wait for the server's banner */
pop3->rd_source = g_io_add_watch(pop3->channel, G_IO_IN,
_on_watch_can_read, plugin);
return FALSE;
}
/* on_watch_can_read */
static gboolean _on_watch_can_read(GIOChannel * source, GIOCondition condition,
gpointer data)
{
AccountPlugin * plugin = data;
POP3 * pop3 = plugin->priv;
char * p;
gsize cnt = 0;
GError * error = NULL;
GIOStatus status;
POP3Command * cmd;
if(condition != G_IO_IN || source != pop3->channel)
return FALSE; /* should not happen */
if((p = realloc(pop3->rd_buf, pop3->rd_buf_cnt + 256)) == NULL)
return TRUE; /* XXX retries immediately (delay?) */
pop3->rd_buf = p;
status = g_io_channel_read_chars(source,
&pop3->rd_buf[pop3->rd_buf_cnt], 256, &cnt, &error);
#ifdef DEBUG
fprintf(stderr, "%s", "DEBUG: POP3 SERVER: ");
fwrite(&pop3->rd_buf[pop3->rd_buf_cnt], sizeof(*p), cnt, stderr);
#endif
pop3->rd_buf_cnt += cnt;
switch(status)
{
case G_IO_STATUS_NORMAL:
break;
case G_IO_STATUS_ERROR:
plugin->helper->error(NULL, error->message, 1);
case G_IO_STATUS_EOF:
default:
pop3->rd_source = g_idle_add(_on_reset, plugin);
return FALSE;
}
if(_pop3_parse(plugin) != 0)
{
pop3->rd_source = g_idle_add(_on_reset, plugin);
return FALSE;
}
if(pop3->queue_cnt == 0)
{
pop3->rd_source = 0;
return FALSE;
}
cmd = &pop3->queue[0];
if(cmd->buf_cnt == 0)
{
if(cmd->status == P3CS_SENT || cmd->status == P3CS_PARSING)
return TRUE;
else if(cmd->status == P3CS_OK || cmd->status == P3CS_ERROR)
memmove(cmd, &pop3->queue[1], sizeof(*cmd)
* --pop3->queue_cnt);
}
pop3->rd_source = 0;
if(pop3->queue_cnt == 0)
pop3->source = g_timeout_add(30000, _on_noop, plugin);
else
pop3->wr_source = g_io_add_watch(pop3->channel, G_IO_OUT,
_on_watch_can_write, plugin);
return FALSE;
}
/* on_watch_can_write */
static gboolean _on_watch_can_write(GIOChannel * source, GIOCondition condition,
gpointer data)
{
AccountPlugin * plugin = data;
POP3 * pop3 = plugin->priv;
POP3Command * cmd = &pop3->queue[0];
gsize cnt = 0;
GError * error = NULL;
GIOStatus status;
char * p;
if(condition != G_IO_OUT || source != pop3->channel
|| pop3->queue_cnt == 0 || cmd->buf_cnt == 0)
return FALSE; /* should not happen */
status = g_io_channel_write_chars(source, cmd->buf, cmd->buf_cnt, &cnt,
&error);
#ifdef DEBUG
fprintf(stderr, "%s", "DEBUG: POP3 CLIENT: ");
fwrite(cmd->buf, sizeof(*p), cnt, stderr);
#endif
if(cnt != 0)
{
cmd->buf_cnt -= cnt;
memmove(cmd->buf, &cmd->buf[cnt], cmd->buf_cnt);
if((p = realloc(cmd->buf, cmd->buf_cnt)) != NULL)
cmd->buf = p; /* we can ignore errors... */
else if(cmd->buf_cnt == 0)
cmd->buf = NULL; /* ...except when it's not one */
}
switch(status)
{
case G_IO_STATUS_NORMAL:
break;
case G_IO_STATUS_ERROR:
plugin->helper->error(NULL, error->message, 1);
case G_IO_STATUS_EOF:
default:
pop3->wr_source = g_idle_add(_on_reset, plugin);
return FALSE;
}
if(cmd->buf_cnt > 0)
return TRUE;
cmd->status = P3CS_SENT;
pop3->wr_source = 0;
if(pop3->rd_source == 0)
pop3->rd_source = g_io_add_watch(pop3->channel, G_IO_IN,
_on_watch_can_read, plugin);
return FALSE;
}